CN100501465C - Illumination device for uniform backlighting of flat panel displays - Google Patents
Illumination device for uniform backlighting of flat panel displays Download PDFInfo
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- CN100501465C CN100501465C CNB2005800300467A CN200580030046A CN100501465C CN 100501465 C CN100501465 C CN 100501465C CN B2005800300467 A CNB2005800300467 A CN B2005800300467A CN 200580030046 A CN200580030046 A CN 200580030046A CN 100501465 C CN100501465 C CN 100501465C
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Abstract
The invention relates to a lighting device for retroilluminating flat-panel monitors, such as displays for mobile applications. Said lighting device comprises a light source (14) and a fiber-optic light guide (10). Light emitted by the light source is injected into the fiber-optic light guide (10). The light is ejected on an exits surface (28) of the fiber-optic light guide (10). According to the invention, a surface structure having diffractive surface elements (30) of constant amplitude is provided for the purpose of light propagation on the exit surface (28) of the fiber-optic light guide (10).
Description
Technical field
The present invention relates to a kind of light fixture that is used to carry on the back the display that illuminates flat-panel screens, particularly move to use.
Background technology
The light fixture of the display of known mobile application comprises light source, and light source can for example be a tubular light source (CCFL).The light that light source sends is coupled in this light guide member at the end face of the light guide member of wedge-shaped cross-section.Particularly owing to the Wedge-shape structures of this light guide member, the total reflection of light beam occurs in phase boundary and light beam penetrates by corresponding scattering center from the surface of wedge shaped light guide parts.The surface of wedge shaped light guide parts is arranged on the display opposite of wanting transillumination.The surface of light guide member is constructed such that light passes through refraction and penetrates from photoconduction.So the light of refraction is by a plurality of film collimations and the guiding that are arranged between light guide member and the display, so that be that white light arrives display basically.The structure of such light fixture is complicated, because for example a plurality of films must be placed in framework or the analog, and must guarantee to avoid the slip or the analogue of film, makes that the structure of above-mentioned light fixture is more complicated.Because so complex structure is the manufacturing cost height.In addition, the risk that has job failure.
The light guide member that is used for mobile telephone display by EP 1 194 915 as can be known.From coupling light in the light source of light source such as LED.In order to be optical coupling out, light guide member has diffraction structure in its surface.Here, whole surface is provided with different gratings, makes grating tight adjacency each other.Grating is constructed such that they have the homogeneity of different diffraction efficiencies to obtain to be optical coupling out.The different diffraction efficient of grating is that the variation by each raster amplitude or this structure height obtains.It is extremely difficult to make the surface structure that has different raster amplitudes like this.And, because the tight adjacency of each grating, probably for example because the technical precision that is difficult to obtain former thereby be difficult to predict diffracting effect, as the interference of not expecting.
The purpose of this invention is to provide a kind of light fixture that illuminates flat-panel screens that is used to carry on the back, this light fixture is with high-level efficiency and the low-cost functional reliability that improves that guaranteed.
Summary of the invention
This purpose is utilized according to the present invention and a kind ofly is used to carry on the back the light fixture that illuminates flat-panel screens and solves.Described light fixture comprises: light source; And light guide member, coupling light to wherein and at exit surface that described light source sends is coupled out from it, described exit surface has the surface structure that comprises the Difraction surface element that is used for the light propagation, wherein all surface elements have the surface structure of constant amplitude, and the size of described surface element is 0.04-10,000 μ m
2
Light fixture of the present invention is specially adapted to flat-panel screens, for example mobile telephone display, PDA display, camera etc.And this light fixture also is applicable to back illumination billboard, display board etc.This light fixture comprises light source, and this light source can comprise one or more LED or CCFL.What light source sent couples light in the light guide member.Preferably, light guide is made by transparent plastic material such as PPMA, PC, PET, PT etc. and/or unorganic glass.The light that is coupled in the light guide member is coupled out at the exit surface of light guide member.When this light fixture was used for mobile phone, exit surface is arranged on the display opposite made light send towards display from photoconduction.According to the present invention, the surface structure of exit surface has the Difraction surface element that is used for the light propagation.By a plurality of such surface elements preferably are provided, can omit the film that is provided in the prior art between light guide member and the display, because, because Difraction surface element of the present invention can be realized enough good illumination.
One or more side surfaces of light guide member can be provided with reverberator to increase the light quantity that penetrates from exit surface.Similarly, light source can be surrounded with increase by reflector sections and be coupled to light quantity in the light guide member.
Use light fixture of the present invention, can omit at the exit surface of light guide member and any other photoconduction assembly between the display such as film.Except above-mentioned reflecting element, the present invention just provides semi-transmission-type (transflective) or transmission-type (transmisive) background illumination without any need for other photoconduction assembly.Because the Difraction surface element is provided on the exit surface of light guide member, the structure of light fixture can be simplified.This has strengthened quality, particularly the serviceable life of light fixture.
Preferably, each surface element is configured to make them to serve as the diffraction element that preferably produces the collimated light beam with spectrum photo-fission.For this reason, each surface element preferably includes the surface structure of corrugated cross-section, and the selection of pitch is decided on the wavelength for the treatment of deflection between the fluctuation.Preferably, each surface element comprises different diffraction grating.Particularly preferably be, surface element is configured such that producing mainly is monochromatic light and/or white light by at least two adjacent light beams are superposeed.Here, monochromatic light refers to ± wavelength coverage of 100nm, is meant especially ± wavelength coverage of 50nm.According to the present invention, by such surface element is provided, can to produce thus be monochromatic light to a great extent, particularly have a collimated light of high light flux density.
The structure on surface element surface also allows to adjust the direction of illumination from the light of exit surface.For this reason, must revise the diffraction grating that is provided in the surface element place according to fraunhofer (Fraunhofer) diffraction rule.This adjustable is preferably to exit surface 0-90 ° scope.
Similarly, by the structure of selection or configuration surface element, can adjust the colour temperature of irradiates light.Preferably, can be 3,000K to 10 adjusts colour temperature in the scope of 000K.
Utilize the structure with exit surface of Difraction surface element of the present invention, particularly can avoid or significantly reduce spectral splitting.Also realize the enough amplifications and the low-energy-consumption of light simultaneously.And, owing to providing of Difraction surface element, and, can realize the well collimated of light particularly owing to the setting of surface element.Here, particularly advantageously be, do not need to provide other light-guiding system, just can obtain these advantages for light amplification or collimation as playing the film of diffraction or reflex.
Difraction surface element of the present invention preferably has 0.04 μ m
2To 10,000 μ m
2, 0.04 μ m particularly
2To 500 μ m
2Size.Because providing of so little surface can provide a plurality of surface elements as moving the display of using to very little flat-panel screens.Here, the mutual spacing between each surface element preferably in the 0-100 mu m range, particularly in the 0-50 mu m range and particularly preferably in the 0-15 mu m range.Particularly preferably be, surface element has the phase mutual edge distance greater than 0.Preferably, this distance is 1 μ m at least, particularly is 3 μ m at least.This favourable part is: in more light light guide member zone to be coupled out is arranged, can reduce the distance between the surface element, and in less light quantity zone to be coupled out is arranged, can provide bigger distance.Therefore, can obtain the good homogenising of Luminance Distribution.And the identical spacing of feeling the pulse with three fingers simulataneously is provided with each surface element, is easier with regard to manufacturing.For example, if surface element is combined with forming element or negative film (negative) by solidified paint (curing lacquer) and makes, surface element is for example separated avoided the disintegration of surface element boundary by forming the lacquer net.In addition, each surface element is separated guarantee disintegration or the refraction of having avoided the diffraction that causes by the abutment surface structure.
Preferably, comprise a plurality of surface elements in the surface element group with different surfaces structure.When doing like this, different surface structures is selected such that the surface element group sends basically monochromatic light and/or white light.The variation of the type of surface structure, the optical wavelength that particularly caused by surface structure is the optical wavelength range sent according to light source and definite.
Preferably, the surface element group comprises at least two surface elements with different surfaces structure.Preferably, this surface element group comprises at least four, at least six surface elements particularly, and each has different surface structures.
Because according to a preferred embodiment of the invention, with regard to height or amplitude, each surface element has identical surface structure, so the diffraction efficiency of each surface element is identical.May produce the variation of only relevant with manufacturing a few percent, this has only slight influence to diffraction efficiency.
Particularly preferably be, each surface element is configured such that the constant amplitude of different surfaces structure, and frequency change only.Depend on the type (it needn't be decided to be the sinusoidal surface structure) of surface structure, the part of all projectioies as a rule has identical height, but has different phase mutual edge distances.This causes the following fact: the light that light source sends is by each surface element diffraction differently.In the case, particularly advantageous is that the distance that changes is simpler than the height that changes.
The surface element (for example it can be six surface elements of different surfaces structure) of preferably being arranged to the surface element group preferably has the same magnitude of 550nm.Each surface element in the surface element group has frequency separately, for example 490nm, 503nm, 517nm, 530nm, 575nm and 620nm.In particular, the Difraction surface element has the sinusoidal surface structure.Distance between each surface element preferably in 1 to 100 mu m range, particularly in 1 to 50 mu m range, most preferably in 1 to 15 mu m range.
The little surface structure like this and the Production Example of surface element are as having description in EP 05 003 358, its disclosure is incorporated herein by reference.The suitable material that is used to make surface element preferably has following composition:
With 11 gram 1H, 1H, 2H, 2H perfluoro capryl acrylate (perfluoro octyle acrylate) with by Ciba
0.2 gram that Lampersheim GmbH sells
184,0.1 gram
819 and 8 gram propylene glycol diacrylates (dipropylene glycol diacrylate) mix.This potpourri of 60 μ l is applied on the nickel plate of 2 * 2cm, and this nickel plate surface utilizes the negative shape die body with scattering center to come patterning.Subsequently, 1mm little PMMA plate thick, 1 * 1cm size is applied on the surface of the potpourri on the nickel plate.Thereafter, the sandwich construction that potpourri is arranged therebetween that obtains on the nickel plate thus stands the UV radiation in 2 seconds of traditional mercury vapor lamp.Then, remove the substrate that joint has the solidified forming compound from negative norm.
The xsect of light guide member can be a wedge shape.But, the parallelepipedon light guide member preferably is provided, light entrance surface is the side of parallelepipedon.Preferably, the parallelepipedon light guide member is a cube.Because according to the good optical efficiency that Difraction surface element provided by the invention obtains, making to provide the parallelepipedon light guide member.Like this, the essence that has realized manufacturing is simplified.The thickness of parallelepipedon light guide member is preferably in the 0.1-3mm scope.
Preferably, can be the light source of one or more LED or CCFL be arranged within the light guide member and/or outside.Surface element is provided with according to the position of this light source or a plurality of light sources.By surface element is set accordingly, can compensate different light intensity that exit surface diverse location place exists etc., make surface element send uniform light, i.e. particularly collimation and monochromatic light and/or white light at exit surface.
In order to increase the light quantity of guiding exit surface, can the cremasteric reflex device.For example, these reflector sections ambient light sources.For example bar-shaped light source preferably is arranged on the focus of paraboloid.Similarly, can provide a plurality of plane reflectors or replacement paraboloid in addition and a plurality of plane reflectors are provided.In addition, the light guide member outside surface of non-light guide member exit surface can provide reverberator to avoid accidental optical loss.Corresponding photoconduction draws and can also obtain by surface element according to the present invention for example is provided in the side of light guide member.Autotelic photoconduction draws and/or the influence of collimation and/or spectrum can also be further by providing surface element of the present invention to obtain on the light source surface.
Except the exit surface at light guide member provides surface element, perhaps replace providing surface element at the exit surface of light guide member, can also be in the opposite flank, be to provide such surface element on the bottom side of light guide member.Thereby the light by the surface element diffraction is directed to display by light guide member.
In particularly preferred embodiment of the present invention, especially be provided at distance between exit surface or apparent surface's the adjacently situated surfaces element along with to the increase of the distance of light source and reduce.This takes into account the following fact: light intensity is higher and along with the increase of the distance of distance light source and reduce at the light source annex.For example, the light source that is arranged in the light guide member can be surrounded by the concentric circles of surface element, and the phase mutual edge distance of circle reduces along with the increase of the distance of distance light source.According to the radiation characteristic of the type of light source, particularly light source, take to be applicable to that the difference setting of its surface element may be favourable.
Therefore, the periodicity of surface element and acyclic setting all are fine.Preferably, surface element is provided with according to the type and the position of this light source or a plurality of light sources.
The preferred embodiments of the present invention are the flat-panel screens with liquid crystal cell such as LCD element.According to the present invention, the light fixture that the liquid crystal cell utilization is constructed corresponding to above-mentioned specification is carried on the back and is illuminated.
Known displays or liquid crystal cell according to prior art comprise optical element, as light box.A plurality of fluorescent tubes, particularly CCFL are set to the light source in this optical element.For the light that fluorescent tube is sent more even, thereby and more even for the illumination that makes liquid crystal cell, between fluorescent tube and liquid crystal cell, paper tinsel is set.These paper tinsels are called BEF paper tinsel and DBEF paper tinsel.The BEF paper tinsel is used to strengthen luminosity.This realizes by a plurality of prisms are provided on this paper tinsel.The DBEF paper tinsel is used to change from the polarity of the light of the dorsal surface reflection of liquid crystal cell and light is returned to liquid crystal cell.In addition, the PRF paper tinsel is used for changing polarity.But, provide such paper tinsel to have the shortcoming of paper tinsel absorbent portion beam split.
In flat-panel screens of the present invention, BEF paper tinsel and preferably also have the DBEF paper tinsel and the PDF paper tinsel is replaced by light guide member constructed according to the invention.Preferably, provide a plurality of light pipes such as CCFL.Light guide member according to the present invention is arranged on light pipe the place ahead, and as mentioned above, this light guide member comprises a plurality of surface elements or surface element group.Particularly preferably be, each light pipe of light guide member all has a district, and this district preferably is arranged to parallel with light pipe and has a plurality of surface elements or the surface element group.Here, each the district textural can be identical.Thereby reduced manufacturing cost.
Preferably, each surface element or the surface element group in each district is arranged to row and column.Here, particularly preferably be, the distance between the single row reduces along with the increase of the distance of distance light pipe.Therefore, can be so that even from the light of the exit surface outgoing of light guide member, that is, especially can be so that luminosity distributes and/or Wavelength distribution is more even.As a result, the BEF paper tinsel be can omit, DBEF paper tinsel and PRF paper tinsel also may be omitted.
Described district can be divided into each subarea.Preferably, the subarea is a rectangle region, compares with the subarea that the position is more inner, and the number that is arranged in the surface element in subarea of light guide member lateral edges or surface element group is bigger.And, the aperiodicity setting of surface element or surface element group can be provided, rather than district and subarea are provided.Here, each surface element or surface element group are provided with according to the luminosity characteristic of light pipe.Preferably, in corner and edge, the density of surface element or surface element group is higher.
Description of drawings
In the remaining part of instructions, more specifically illustrate the feasible disclosure of complete sum of the present invention to those of ordinary skill in the art with reference to the accompanying drawings, comprise its optimal mode, in the accompanying drawings:
Fig. 1 is the perspective schematic view of light fixture,
Fig. 2 illustrates the example of the surface structure of surface element,
Fig. 3 illustrates the example that may be provided with of surface element,
Fig. 4 illustrates the example that the exit surface of light guide member is divided into different districts, and
Fig. 5 is first form of describing or limit district shown in Figure 4,
Fig. 6 is second form of describing or limit district shown in Figure 4,
Fig. 7 is the 3rd form of describing or limit district shown in Figure 4,
Fig. 8 and Fig. 9 are the schematic plan of other embodiment of light fixture,
Figure 10 is the exploded view of indicative icon flat-panel screens,
Figure 11 is the schematic plan that is suitable for the light guide member that adopts according to the present invention in flat-panel screens, and
Figure 12 is the part enlarged drawing of light guide member.
Embodiment
Light fixture of the present invention comprises light guide member 10, and light guide member 10 is cube in illustrated embodiment, and can be made by for example transparent resin or plastic material such as PPMA or analog.In an illustrated embodiment, bar-shaped light source is arranged to a side 12 along light guide member 10, and the longitudinal axis of light source 14 is arranged to be parallel to side 12.Light source 14 surrounds the open side points sideways 12 of reverberator 16 by paraboloid 16.Thereby, increased the light quantity that is coupled in the side 12.Can be a plurality of LED rather than shown in the scope of optical density of light source 14 of light pipe be preferably 20,000-50,000cd/m
2When tubular light source 14 was provided, it preferably was arranged on the focal axis of paraboloid 16.
It can be the reverberator 20 of reflector film or analog that the bottom surface 18 of light guide member 10 is provided with.Can also be in the side 22 and/or 24 and/or 26 reverberator be set.Replace the cremasteric reflex device, corresponding surface also can be polished.With the reflection horizon vapor deposition may be favourable.
A plurality of Difraction surface elements 30 are positioned on the exit surface 28 of light guide member 10, make to form according to surface structure of the present invention.
Each surface element 30 serves as diffraction grating.Here, can provide different surface elements, they are designed to have the linear diffraction grating of different grating constants.For example, the surface 32 (Fig. 2) of each surface element 30 is designed to the phase place sinusoidal grating.Here, each surface element 30 preferably includes two half-sinusoids.
According to the present invention, the manufacturing of the surface structure 32 of the manufacturing of each surface element 30, especially surface element 30 is realized by photoetching process (photolithographic process).In addition, in particularly preferred embodiment, surface element 30 can be made as described in the EP 05 003 358.
In particularly preferred embodiment of the present invention, each surface element 30 is included in (Fig. 3) in the surface element group 33.In illustrated embodiment, surface element group 33 comprises six surface elements 30, preferably is provided with gap and constant mutual edge distance mutually between these six surface elements 30.Each each surface element 30 has different surface structures makes surface element group 33 send monochromatic light or white light basically.
In order to be coupled out the light of different wave length, preferably provide different surface elements 30, i.e. the surface element 30 of different surfaces structure.For example, shown in the embodiment among Fig. 3, these different surface elements 30 can be six different surface elements 30, represent to 6 with 1 in Fig. 3.Apparent among Fig. 3, be respectively applied for the different surfaces element 1 that is coupled out specific wavelength in the illustrated embodiment and be set to repetitive structure to 6.
In the embodiment shown, surface element 30 is square and has the length of side of about 15 μ m.
In particularly preferred embodiment (Fig. 4), each surface element 30 is arranged in the district.In Fig. 4, the district with 1 to 10 and 1_1 represent to 1_4.The distance of the yardstick in district and district's inside surface element according to form shown in Figure 5 as can be known.
Among Fig. 4 and the embodiment shown in Figure 5, light source is positioned at the left side, promptly among Fig. 4 with the next door in 1 district that represents.From light source, the phase mutual edge distance of each surface element 30 reduces gradually along with the increase of the distance of distance light source.In each district or zone, surface element has constant distance.But passable is that in a district, surface element has different distances.In particular, on the longitudinal direction, be that from left to right distance can change according to the distance perpendicular to longitudinal direction among Fig. 4.
Use the simulation software " Light Tools " of ORA, be configured the district that limits among Fig. 4 and Fig. 5 as the light fixture of describing referring to figs. 1 to Fig. 5, and measured homogeneity (homogeneity), color, optical density, lighting power and collimation.Corresponding measurement is carried out at nine points, and these nine points are positioned at the corner, are positioned at the edge center at about 2mm place apart from the edge and the center that is positioned at this photoconduction.
Use the setting as the surface element defined in Fig. 4 and Fig. 5, the emulation of being carried out obtains following result:
Homogeneity: 91%
Color: white
Average lighting power: 1,600lux
Average optical: 2,950nit
Direction of collimation: 17 °
In another emulation, the distance in each district (Fig. 4) between the surface element 30 is limited as shown in Figure 6.
Here, obtain following result:
Homogeneity: 86%
Color: muted color (light blue)
Average lighting power: 1,000lux
Average optical: 1,900nit
Direction of collimation: 17 °
In another emulation, the distance in each district (Fig. 6) between the surface element 30 is limited as shown in Figure 7.
Here, obtain following result:
Homogeneity: about 78%
Color: white
Average lighting power: 1,050lux
Average optical: 1,850nit
Direction of collimation: 17 °
In another test, omitted district 8,9 and 10, investigate short light guide member 10 thus, light also is to be coupled to this light guide member 10 from the left corresponding to light guide member shown in Fig. 4.Thereby the light guide member of being tested has the yardstick of about 36mm (length) and 44mm (width), wherein length along the direction in district, be from left to right to measure among Fig. 4.Distance in the district between each surface element is corresponding to the distance that limits for district 1 to 6, district 1_1,1_2,1_3 and 1_4 among Fig. 5.Here, record following result:
Homogeneity: about 88%
Color: white
Average lighting power: 1,100lux
Average optical: 2,150nit
Direction of collimation: 17 °
In other test, the surface of light guide member 10 is not divided into the district, and is constant but the distance between each surface element is chosen as.Here, obtain following result:
Distance: 4 μ m
Homogeneity: about 75%
Color: white
Average lighting power: 1,850lux
Average optical: 3,350nit
Direction of collimation: 17 °
Distance: 6 μ m
Homogeneity: about 78%
Color: white
Average lighting power: 1,600lux
Average optical: 2,400nit
Direction of collimation: 17 °
Distance: 8 μ m
Homogeneity: about 82%
Color: white
Average lighting power: 1,400lux
Average optical: 2,500nit
Direction of collimation: 17 °
Distance: 10 μ m
Homogeneity: about 84%
Color: white
Average lighting power: 1,200lux
Average optical: 2,200nit
Direction of collimation: 17 °
Distance: 11 μ m
Homogeneity: about 87%
Color: white
Average lighting power: 1,200lux
Average optical: 2,150nit
Direction of collimation: 17 °
According to the appeal test result, can draw as drawing a conclusion:
1. the setting of Difraction surface element and the permission that distributes are set about photodistributed height homogeneity.
2. even for not good enough relatively surface be provided with, also always each blend of colors can be become white with low homogeneity.
3. can be independent of the distribution of surface element and set direction of collimation.
4. optical density is the function of distance between the point.
Particularly, realized the customer satisfaction system high-quality illumination of making of display when with light fixture of the present invention during (wherein 75% or higher homogeneity be acceptable) as mobile phone backlight.Especially, do not need the help of photoconduction paper tinsel, just can obtain the target direction of collimation in conjunction with predetermined colour temperature.Thereby, can further miniaturization total system, and the decreased number and the layout high flexible of assembly simultaneously.
Fig. 8 and Fig. 9 illustrate two embodiment in addition of the light fixture backlight that is especially suitable for use as mobile phone.
In illustrated embodiment, the light that is arranged so that of each surface element or each surface element group evenly is coupled out as much as possible.Here, on the direction of dotted line 42, the variable in distance between each surface element or each surface element group makes that the distance between each element or the group reduces along with the increase of the distance of distance LED.
The embodiment of light fixture shown in Figure 9 also comprises the LED 44 as light source, and wherein in illustrated embodiment, three LED 44 are arranged on 40 places, short side of light guide member 10.Here, light guide member 10 preferably comprises groove 46 at 40 places, short side.Preferably, groove 46 is semicircle.In illustrated embodiment, groove 46 spreads all over the whole thickness of light guide member 10.Hemispheric groove can also be provided, and the diameter of ball is less than the thickness of light guide member 10.
In this embodiment, surface element or surface element group are arranged so that once more at exit surface 20 and are obtained the homogenising that luminosity distributes.
Certainly, can described different embodiment are combined.For example, LED can be provided on the several side.Especially, a plurality of LED center on the whole periphery of light guide member 10 and are provided with.Similarly, can the embodiment shown in Fig. 8 and Fig. 9 is combined.Especially, with LED and one or several CCFL pipe combined may be feasible.For example, can revise light fixture shown in Figure 1, making provides corresponding LED in two corners that CCFL manages 14 opposites, as illustrating especially among Fig. 8.Thereby, can guarantee good illumination in simple mode away from these two corners of CCFL pipe 14.
In the preferred embodiment of light fixture of the present invention, light fixture of the present invention is provided in the flat-panel screens.The primary element of flat-panel screens is liquid crystal 50 (Figure 10).Liquid crystal cell typically is the LCD element.In addition, provide light box or analog as light source 52, it comprises a plurality of light pipes that are parallel to each other 54.Preferably, light pipe is CCFL.
According to prior art, between light box 52 and liquid crystal cell 50, several paper tinsels are provided.They are so-called BEF paper tinsel, DBEF paper tinsel and PRF paper tinsel.
According to the present invention, the BEF paper tinsel is substituted by light guide member 56 at least.Light guide member 56 disposes described about Fig. 1-3 as the front basically.
Figure 12 has described the preferred setting of surface element group 33.Here, each surface element group 33 is symmetrical arranged about center line 60.From center line 60, the distance between each surface element group 33 reduces along the direction of arrow 62 (promptly outside).
In illustrated embodiment, surface element group 33 is arranged to row and column, and wherein the distance between the row is constant.In development of the present invention, district 58 can be divided into the subarea that is preferably rectangle.In Fig. 2, these subareas are arranged side by side.Here, can in each subarea, provide different clearance distances, wherein be in the edge, promptly be in the left side among Figure 12 or the subarea on the right and preferably have the less clearance distance.
Replace light box 52 (Figure 10) being provided or except light box 52 is provided, can also providing for example four or more light pipes 54, it makes the light side direction inject light guide member 56 along the periphery setting of light guide member 56.Again, surface element or surface element group are configured such that luminosity distributes as far as possible equably from light guide member towards the LCD element.Preferably, the distance between each surface element or the surface element group is towards the center of light guide member and reduce.The surface of light guide member can also be divided into four districts or section, be preferably four identical rectangular section, its each preferably be configured to about the center of light guide member and point symmetry.
Although reference certain illustrative embodiment of the present invention describes and has explained the present invention, is not to be intended to the present invention is limited to these illustrative embodiment.One skilled in the art will understand that and under the situation that does not deviate from the true scope of the present invention that is defined by the following claims, can change and revise.Therefore, be intended to all the such variations and the modification that fall into claims and be equal in the scope of setting are included in the present invention.
Claims (38)
1. be used to carry on the back the light fixture that illuminates flat-panel screens, comprise:
Light source, and
Light guide member, coupling light to wherein and at exit surface that described light source sends is coupled out from it,
Described exit surface has the surface structure that comprises the Difraction surface element that is used for the light propagation,
Wherein
All surface elements have the surface structure of constant amplitude, and the size of described surface element is 0.04-10,000 μ m
2
2. light fixture according to claim 1, wherein said flat-panel screens is for moving the display of using.
3. light fixture according to claim 1 and 2, wherein said each surface element serve as the diffraction element that produces the collimated light beam with spectrum photo-fission.
4. light fixture according to claim 1 and 2, wherein said surface element are configured such that by at least two adjacent beams are superposeed and produce monochromatic light and/or white light.
5. light fixture according to claim 3, wherein said surface element are configured such that by at least two adjacent beams are superposeed and produce monochromatic light and/or white light.
6. light fixture according to claim 1 and 2, the size of wherein said surface element are 0.04-500 μ m
2
7. light fixture according to claim 1 and 2, the phase mutual edge distance of wherein said each surface element are 0-100 μ m.
8. light fixture according to claim 7, the phase mutual edge distance of wherein said each surface element are 0-50 μ m.
9. light fixture according to claim 8, the phase mutual edge distance of wherein said each surface element are 0-15 μ m.
10. light fixture according to claim 1 and 2, wherein the distance of adjacently situated surfaces element reduces along with the increase of the distance of the described light source of distance.
11. light fixture according to claim 10, wherein the distance between the adjacently situated surfaces element progressively reduces.
12. light fixture according to claim 1 and 2, wherein said surface element aperiodicity ground is provided with.
13. light fixture according to claim 1 and 2, wherein said exit surface comprise that wherein said surface element has the zone of same distance.
14. light fixture according to claim 1 and 2, wherein said light source are arranged within the described light guide member and/or outside.
15. light fixture according to claim 1 and 2, wherein in order to increase the light quantity that is coupled in the described light guide member, the described light source device that is reflected partly surrounds.
16. light fixture according to claim 15, the described light source that paraboloid wherein is provided and has been designed to fluorescent tube is arranged on the focus of described paraboloid.
17. light fixture according to claim 1 and 2, the side of the non-described exit surface of at least one of wherein said light guide member are provided with reverberator and/or have reflecting surface.
18. light fixture according to claim 1 and 2, wherein said light source comprises one or more LED.
19. light fixture according to claim 1 and 2, wherein said light guide member are parallelepipedon in shape.
20. light fixture according to claim 1 and 2, wherein said light guide member are wedge shape, described light source is arranged on the place, little side of described wedge.
21. light fixture according to claim 1 and 2, wherein a plurality of surface elements are included in the surface element group, and described surface element group is sent monochromatic light and/or white light.
22. light fixture according to claim 21, wherein at least two surface elements are included in the described surface element group.
23. light fixture according to claim 22, wherein at least four surface elements are included in the described surface element group.
24. light fixture according to claim 23, wherein at least six surface elements are included in the described surface element group.
25. flat-panel screens comprises liquid crystal cell and the light fixture that illuminates described liquid crystal cell according to a described back of the body among the claim 1-24.
26. flat-panel screens according to claim 25 wherein provides a plurality of light pipes as described light source, and each light pipe of wherein said light guide member comprises a district, described district comprises surface element and/or surface element group.
27. flat-panel screens according to claim 26, wherein said a plurality of light pipes are parallel to each other.
28. flat-panel screens according to claim 26, wherein said district is arranged to parallel with described light pipe.
29. according to described flat-panel screens one of among the claim 26-28, wherein said surface element and/or surface element group are arranged to row and column in the district.
30. flat-panel screens according to claim 29, the distance between the wherein said row reduces along with the increase of the distance of the described light pipe of distance.
31. according to described flat-panel screens one of in claim 26-28 and 30, wherein the setting of surface element or surface element group described in each district is about the center line symmetry.
32. flat-panel screens according to claim 29, wherein the setting of surface element or surface element group described in each district is about the center line symmetry.
33. flat-panel screens according to claim 31, wherein said center line are provided at the bee-line place apart from described light pipe.
34. flat-panel screens according to claim 32, wherein said center line are provided at the bee-line place apart from described light pipe.
35. according to described flat-panel screens one of among the claim 26-28, wherein said zoning is divided into the subarea.
36. flat-panel screens according to claim 35, wherein said subarea is shaped as rectangle.
37. flat-panel screens according to claim 35 wherein comprises more surface element or surface element group in the subarea that edge's side direction of described light guide member provides than other subarea.
38. flat-panel screens according to claim 36 wherein comprises more surface element or surface element group in the subarea that edge's side direction of described light guide member provides than other subarea.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04021429 | 2004-09-09 | ||
| EP04021429.8 | 2004-09-09 | ||
| EP05100313.5 | 2005-01-19 | ||
| EP05005303.2 | 2005-03-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101014887A CN101014887A (en) | 2007-08-08 |
| CN100501465C true CN100501465C (en) | 2009-06-17 |
Family
ID=34926474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800300467A Expired - Fee Related CN100501465C (en) | 2004-09-09 | 2005-08-10 | Illumination device for uniform backlighting of flat panel displays |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100501465C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154626A (en) * | 2016-08-17 | 2016-11-23 | 京东方科技集团股份有限公司 | A kind of display device |
| CN107703672A (en) * | 2017-11-21 | 2018-02-16 | 武汉华星光电技术有限公司 | Array base palte and preparation method thereof, flexible display panels, flexible display |
-
2005
- 2005-08-10 CN CNB2005800300467A patent/CN100501465C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101014887A (en) | 2007-08-08 |
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