CN103207495A - Reflective display device - Google Patents
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- CN103207495A CN103207495A CN2012100151055A CN201210015105A CN103207495A CN 103207495 A CN103207495 A CN 103207495A CN 2012100151055 A CN2012100151055 A CN 2012100151055A CN 201210015105 A CN201210015105 A CN 201210015105A CN 103207495 A CN103207495 A CN 103207495A
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Abstract
The invention relates to a reflective display device, which comprises a reflective display layer and an reinforcing film, wherein the reflective display layer comprises a plurality of display elements and isolating parts between adjacent display elements; and the reinforcing film is arranged on the reflective display layer and is used for refracting light rays which enter and leave the reflective display layer. The reinforcing film is provided with film units which correspond to the display elements one to one. The film units of the reinforcing film are arranged in a matrix pattern or a honeycomb pattern. Each film unit comprises a first area above the corresponding display element and a second area above the corresponding isolating part. Each second area enables the propagation direction of the refracted light rays to deflect towards the adjacent display element. By using the reflection reinforcing film above the reflective display layer, more light rays are enabled to be incident on the surfaces of the display elements on which electric control can be carried out, carry image information, are reflected out of an electronic paper device, and arrive at the view angle of a reader, so that the continuity of image display is realized and the display contrast of electronic paper is improved.
Description
Technical field
The present invention relates to display device, relate in particular to a kind of reflective display.
Background technology
Reflected displaying device need not bias light, and it is to utilize surround lighting to produce image, as long as just the lighting condition of satisfying the demand can realize showing.Ambient lighting and the reflectivity of display under white states are depended in the brightness of reflected displaying device, and change with the change of eyes adaptating lighting condition.The contrast of reflected displaying device is defined as the ratio of display white states reflectivity and black state reflectivity.
Electric paper display is a kind of complete reflected displaying device, is exactly a kind of novel electronic paper display technique such as electrophoresis showed.This technology is to utilize the electrophoretic characteristic of pigment particles, the charged pigment particle is suspended in the solvent and the suspension system that forms.Under electric field action, the charged pigment particle is mobile along direction of an electric field (positively charged particle) or contrary direction of an electric field (electronegative particle), thereby shows frame.Because electrophoresis liquid and charged particle proportion approach, and still can keep show state (being so-called bistable state) after electric field is removed, and have significantly reduced energy consumption.Electrophoretic display device (EPD) mainly can be divided into microcapsules formula electrophoretic display device (EPD) and little glass of form electrophoretic display device (EPD).The principle of microcapsules formula electrophoretic display device (EPD) is that electrophoresis liquid is encapsulated in the microcapsules of particle diameter 50-150 μ m, then microencapsulation material is made film, or microcapsules are coated on the matrix electrodes plate.Little glass of form electrophoretic display device (EPD) is a kind of electrophoretic display technology that U.S. SiPix Imaging company develops, its principle is charged corpuscle to be dispersed in constitute colloid electrophoresis liquid in the insulation impregnant of dyeing, as microcapsules electrophoresis liquid is carried out the subregion sealing, be about to it and be encapsulated in special little cup.This technology can prevent the effect that reunion is crosstalked between electrophoretic particles, reduces the influence not of external environment band greatly, and easier realization bistability is simultaneously to there being certain buttressing effect between the electrode.The microcapsules of electronic ink technologies or little glass of lattice include the display medium of 2 kinds of colors, and black particle wherein is electronegative, and the white particle positively charged relies on the change pulling granules of pigments of upper/lower electrode to move up and down in microcapsules, produces black and white GTG change color.The reflectivity of electronic ink display is 3-6 times of LCD, and contrast is 2 times of LCD.
For microcapsules formula electrophoretic display device (EPD) or little glass of form electrophoretic display device (EPD), surround lighting sees through transparent electrode plate (upper substrate) and incides on the microcapsules sphere reflected back reader eyes again, thereby sees image.Fig. 1 is that a kind of existing microcapsules formula Electronic Paper shows synoptic diagram.As shown in the figure, owing to have the gap of certain distance between the adjacent display element 3 (microcapsules or little glass of lattice) in the electrophoresis layer 2, make that the image pixel that shows is discontinuous, form the image blind area.On the other hand, the reflection ray 12f that incides the light 12 of microcapsules subregion can not transmit display, but disappears in electrophoresis layer 2 inside, and this has also caused the disappearance of this part image, forms the image breakpoint.Then the reflectivity in this image blind area or image breakpoint zone is not controlled by display, has caused the contrast of entire image to descend on the whole.In addition, the light that incides adjacent display element gap causes the waste of this part light, has reduced reflectivity.So one of problem that present electrophoretic display device (EPD) exists is exactly how removal of images blind area and image breakpoint, realize showing the continuity of image, improve the contrast that shows image; How to improve display to the utilization factor of light in addition, to strengthen the brightness of display.
Summary of the invention
The objective of the invention is removal of images blind area and image breakpoint, realize showing the continuity of image.
For achieving the above object, the invention provides a kind of reflective display.This device comprises: reflective display layer comprises the isolated part between a plurality of display elements and the adjacent display element; Strengthen film, be arranged on the described reflective display layer, the light that passes in and out described reflective display layer is reflected.Described enhancing film has and described display element film unit one to one.The film unit that described enhancing film has is matrix Pareto diagram or honeycomb arrangement pattern.Described film unit comprises the first area that is positioned at described display element top and the second area that is positioned at described isolated part top.Described second area makes the direction of propagation of refracted ray deflect to contiguous described display element.
The reflective display of the embodiment of the invention, utilize the reflection enhancement film on the reflective display layer, the incident ray that makes part arrive this device changes the direction of propagation, make more light can incide the surface of the display element that can implement electric control, and change the direction of propagation when making its reflection ray carry image information again through the enhancing film, transmit this display device and turn back in reader's the angular field of view.Pass through the solution of the present invention, strengthen effect that the film unit of the given shape that film has produces and be and be delivered on the display panel and gap extension around it image shown in each display element is complete, filled up the image blind area thus, eliminate the image breakpoint, realized showing the continuity of image, strengthened reflective contrast of display degree on the whole.Improve the utilization factor to light on the other hand, strengthened the brightness of this reflected displaying device.
Description of drawings
Fig. 1 is that a kind of existing microcapsules formula Electronic Paper shows synoptic diagram;
Fig. 2 is the structural representation of a kind of reflective display of the embodiment of the invention;
Fig. 3 is a kind of plan structure synoptic diagram that strengthens film of the embodiment of the invention;
Fig. 4 is the demonstration synoptic diagram of a kind of reflective display of the embodiment of the invention;
Fig. 5 is the structural representation of the another kind of reflective display of the embodiment of the invention;
Fig. 6 is the demonstration synoptic diagram of the another kind of reflective display of the embodiment of the invention;
Fig. 7 is the plan structure synoptic diagram that the another kind of the embodiment of the invention strengthens film.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The embodiment of the invention adopts and cover the enhancing film that one deck has given shape on reflective display layer, has changed the direction of propagation of part incident ray, makes it carry image information reflected back reader eyes, shows contrast and brightness to strengthen.
Fig. 2 is the structural representation of a kind of reflective display of the embodiment of the invention.As shown in the figure, this reflective display comprises upper substrate 10, strengthens film 20, reflective display layer 30 and infrabasal plate 40.
Described upper substrate 10 and the film substrate of infrabasal plate 40 for being oppositely arranged all adopt nonconducting flexible material.Described upper substrate 10 adopts light transmissive material as the display panel of this reflective display.Described infrabasal plate 40 can adopt opaque material.
Described reflective display layer 30 wherein comprises a large amount of display elements 31 between upper substrate 10 and infrabasal plate 40, be arranged in the reflective display layer 30 with the structure of single or multiple lift.These display elements adopt reflective material to make, and are used for light is reflected to form image.Also comprise the isolated part 32 between the adjacent display element in the described reflective display layer 30.
This reflective display also comprises: common electrode layer 11 is arranged between upper substrate 10 and the reflective display layer 30; With pixel electrode layer 41, be arranged at the upper surface of infrabasal plate 40, have the rectangular area that array structure is arranged, each rectangular area in this array structure forms a pixel cell 411, to a pixel that should reflective display shows.
Described enhancing film 20 is positioned at a certain position on the reflective display layer 30, is used for the light that passes in and out described display element 31 is reflected.Preferably, in the present embodiment it is arranged at the upper surface of common electrode layer 11.Described enhancing film 20 comprises the film unit 21 identical with the arrangement mode of display element 31, i.e. each film unit 21 corresponding display element.
As mentioned above, the display element 31 in the present embodiment and the film unit 21 that strengthens on the film 20 are corresponding one by one, have identical arrangement mode.Fig. 3 is a kind of plan structure synoptic diagram that strengthens film of the embodiment of the invention.As shown in FIG., preferably, the film unit 21 that strengthens in the film 20 is arranged in the mode of matrix array.This enhancing film 20 is applicable to the situation that the display element 31 in the present embodiment is arranged in the mode of matrix array.
Preferably, the reflective display of present embodiment is electric paper apparatus, and described reflective display layer 30 is electrophoresis layer, adopts the electronic material with bistable characteristic and electrophoretic effect.Preferably, the display element 31 in the present embodiment is microcapsules, and the isolated part between the adjacent microcapsules 31 is the space 32 between the adjacent microcapsules.These microcapsules 31 can be tubulose, sphere, ellipse or other shapes.Each microcapsules 31 is cavitys of complete closed, wherein is packaged with the charged particle 312 of electrophoresis liquid 311 and some different colours, and electrophoresis liquid 311 is identical with the density of charged particle 312.Charged pigment particle 312 in the present embodiment has white and black two kinds of colors, and positively charged and negative charge is dispersed in the electrophoresis liquid 311 respectively.Each microcapsules 31 is electrically connected with common electrode layer 11 on the upper substrate 10, also is electrically connected with pixel electrode layer 41 on the infrabasal plate 40.
Each film unit 21 of enhancing film 20 in the present embodiment has specific surface configuration, and this specific surface configuration depends on the type of display element 31.The shape of each film unit 21 is that enhancing film 20 integral body are adhered to after upper substrate 10 surfaces, uses special mould once to suppress formation.This strengthens film 20 and adopts transparent refractive material, and such as the PET material, film thickness is relevant with refractive index size and the needed refracted ray deflection size of material.Strengthen film 20 and comprise the first area that is positioned at described display element top and the second area that is positioned at described isolated part top.Second area makes the direction of propagation of refracted ray deflect to contiguous display element, has big thickness or adopts big refractive index materials to make.Present embodiment is pressed into specific shape by the film unit 21 that will have specific refractive index and thickness makes the refracted ray of discrepancy second area to contiguous display element big deflection take place, shape such as film unit 21 can be to have protruding sphere, the convex arc surface of certain curvature or the plane with dome arc angle, make the light that arrives film unit 21 diverse locations have different incident angles, and then light is propagated along required best incident and reflection direction.For example give when adding an electric potential difference between common electrode layer 11 and the pixel electrode layer 41, just form a direct current electric field in electrophoresis layer 30, the different charged pigment particles in the microcapsules 31 just can move to top and the bottom of microcapsules 31 respectively under effect of electric field.The color that moves to the charged particle at microcapsules 31 tops sees through upper substrate 10 and shows under the irradiation of surround lighting, form image.
Preferably, the microcapsules 31 in the present embodiment are the sphere of diameter 100um, and the shape that strengthens the film unit 21 of film 20 is the arc surface of projection, and the refractive index size is 1.575.The maximum ga(u)ge of first area and second area is respectively 80um and 50um.
Fig. 4 is the demonstration synoptic diagram of a kind of reflective display of the embodiment of the invention, the microcapsules formula electric paper apparatus in corresponding above-described embodiment.Save common electrode layer 11 and upper substrate 10 on the electrophoresis layer 30 among the figure, but had same hint effect.As shown in the figure, suppose that Ray Of Light (be example with the light perpendicular to the Electronic Paper display panel) sees through a series of parts (comprise and strengthen film 20) and arrives electrophoresis layer 30.In this communication process, the direction of propagation of some light does not change because strengthening film 20, and other light refraction effect then take place in strengthening film 20 changed the direction of propagation.Strengthen film 20 and make these light that change the direction of propagation incide the correct position on microcapsules 31 surfaces, and its reflection ray can be returned along certain path, arrive reader's eyes.
As shown in FIG., light 51 incides when strengthening on the film 20, just in time perpendicular to the tangential direction of incidence point, so light 51 does not change the direction of propagation after strengthening films 20.Light 51 then incides the A on microcapsules 31 surfaces
0Point, and perpendicular to A
0The tangent line of point so reflection ray 51f returns along the travel path of incident ray, arrives in reader's the visual angle.
Refraction has taken place when strengthening film 20 in light 52 processes, departs from the B that the original direction of propagation arrives microcapsules 31 surfaces
0Point, through reflection back, microcapsules 31 surface and again through after strengthening film 20 and refraction for the second time taking place, (be example with the light perpendicular to the Electronic Paper display panel) transmits in electric paper apparatus arrival reader's the visual angle reflected light 52f along path shown in the figure.The reverse extending line of reflected light 52f is through the B of electrophoresis layer 30
1Point that is to say, the B that the reader sees by light 52f
0The image of point is from B seemingly
1Point is launched.As seen, the effect of enhancing film 20 is with B
0The image transfer of point has arrived B
1The point.
For light 53, when not strengthening film 20, its reflection ray 53f
0Disappear in the space 32 between the adjacent microcapsules 31.And under the effect that strengthens film 20, as the communication process of light 52, light 53 arrives the C on microcapsules 31 surfaces
0Point, reflection ray 53f transmit electric paper apparatus and arrive in reader's the visual angle, and its reverse extending line is through the C of electrophoresis layer 30
1Point, i.e. C
0The image transfer of point has arrived C
1The point.On the one hand, C
0The effect that the image of point is strengthened film 20 is presented on the Electronic Paper display panel, has avoided the image disappearance; On the other hand, filled up C on the Electronic Paper display panel
1The image blind area at some place.
For light 54, when not strengthening film 20, incide in the gap of adjacent microcapsules 31 and disappear in the electrophoresis layer 30.And under the effect that strengthens film 20, light 54 arrives the D on microcapsules 31 surfaces
0Point, reflection ray 54f transmits electric paper apparatus, and its reverse extending line is through the D of electrophoresis layer 30
1Point, D
0The image transfer of point has arrived D
1The point.Utilize D on the one hand
0The image of point has been filled up D
1The image blind area at some place makes the light in the gap that can incide adjacent microcapsules 31 originally obtain effective utilization on the other hand.
Incident ray and emergent ray have below only been enumerated all perpendicular to the situation of Electronic Paper display panel.In fact, incident ray also comprise along other angles incide on the electric paper apparatus light, emergent ray yet comprises along the light of other angle outgoing.Because display device of electronic paper has the characteristic of big visible angle, the emergent ray of propagating in the angle of visibility scope can both arrive reader's eyes.So after the surface configuration of the material, film thickness and each film unit 21 that strengthen film 20 is determined, as long as those have satisfied the incident ray of certain incident angle, can both arrive the surface of microcapsules 31 and carry image information and turn back in the angle of visibility scope, be seen by the reader.
More than analyzed microcapsules 31 right half of procedure for displaying, according to its symmetric relation, the half of demonstration situation in a left side also as above analytic process obtain.
As mentioned above, strengthen film 20 and can change the direction of propagation of part light, the effect of generation is to extend on the complete display panel that is delivered to reflective display of the image shown in the display element 31 in the reflective display layer 30 and by the isolated part 32 of centre to its both sides.In like manner, vertical therewith direction epigraph also complete demonstration and by the centre forwards, backwards the isolated part 32 of both sides extend, namely the image showed of each display element 31 by light fully receive the back by the centre to around the back amplification of extending show.Fill up the image blind area thus, eliminated the image breakpoint, realized showing the continuity of image, also improved the contrast of entire image.In addition, present embodiment has effectively utilized light 54, has improved the utilization factor of light; And according to the light path principle of reversibility, along the light of the path incident of reflection ray 53f and 54f, its reflection ray will be respectively transmits Electronic Paper along the travel path of incident ray 53 and 54, arrives in the reader visual angle.So also improve the utilization factor of light, made more incident raies can both carry the image information reflected back reader's of display element 31 eyes, improved the brightness that Electronic Paper shows.
Fig. 5 is the structural representation of the another kind of reflective display of the embodiment of the invention.As shown in FIG., this reflective display is little glass of form electric paper apparatus.The type of the display element 31 of this electric paper apparatus in electrophoresis layer 30 was different with the film unit shape that strengthens film 20, other structures that comprise were all basic identical with microcapsules formula electric paper apparatus shown in Figure 2, and therefore identical component no longer is given unnecessary details.In this little glass of form electric paper apparatus, the display element in the electrophoresis layer 30 is little glass of lattice 33, and the isolated part between the adjacent little glass of lattice 33 is little glass of partition wall 34.The cross section of overlooking of these little glass of lattice 33 can be rectangle (square, rectangle), regular polygon (as regular hexagon) or other shapes.The array arrangement structure of little glass of lattice 33 and film unit 21 is relevant with the shape of overlooking the cross section of little glass of lattice 33, can be matrix array, honeycomb array or other array structures.The effect of little glass of partition wall 34 also can be to playing the effect of support except electrophoresis layer 30 being divided into a plurality of little glass of lattice 33 between the upper and lower base plate.Each little glass of lattice 33 is cavitys of complete closed, wherein is packaged with the particle 332 of electrophoresis liquid 331 and some white and black, difference positively charged and negative electricity.The surface configuration of the film unit 21 in the present embodiment can be to have protruding sphere, the convex arc surface of certain curvature or the plane with dome arc angle.
Preferably, little glass of lattice 33 in the present embodiment are squares of the long 100um of rib, also are illustrated in figure 3 as the matrix array structure so strengthen the plan structure synoptic diagram of film 20, and partition wall 34 adopts the PET material, the shape of film unit 21 is convex arc surface, and the refractive index size is 1.575.The thickness of first area and second area is respectively 80um and 50um.
Fig. 6 is the demonstration synoptic diagram of the another kind of reflective display of the embodiment of the invention, the little cup type electric paper apparatus in corresponding above-described embodiment.As shown in FIG., suppose that Ray Of Light (being example with the light perpendicular to the Electronic Paper display panel still) sees through a series of parts and arrives electrophoresis layer 30.Do not strengthen film 20 if do not use, the light that incides in the electrophoresis layer is divided into two parts, and the light 55 of first impinges perpendicularly on the surface of little glass of lattice 33, and the reflection back is returned in the visual angle that arrives the reader along former road, the light 56 of second portion incides the surface of partition wall 34, is absorbed by little glass of partition wall 34.Disappear in the electrophoresis layer 30.
When having used enhancing film 20, light 55 does not change through strengthening film 20 travel paths, incides E
0Point is at E
0Reflection ray 55f behind the point reflection returns in the visual angle that arrives the reader along former road.Refraction has taken place when strengthening film 20 in light 56 processes of second area top, departs from the F that the original direction of propagation arrives microcapsules 31 surfaces
0Point, through after the 33 surface reflections of little glass of lattice and again through after strengthening film 20 and refraction for the second time taking place, reflected light 56f transmits electric paper apparatus along path shown in the figure and arrives in reader's the visual angle.The reverse extending line of reflected light 56f is through F
1Point namely strengthens film 20 with F
0The image transfer of point has arrived F
1Point, and effectively utilized light 56.
With the analysis of Fig. 4, incident ray and emergent ray also comprise other light that satisfy certain angle respectively.According to symmetric relation, by the propagation of the light of little glass of lattice 33 left half of incidents and image shows situation also as above-mentioned analysis obtains.Finally the image of this pixel of being showed by each little glass of lattice 33 by light fully receive the back by the centre to around the back of extending amplify and show.And the light of second area top also is fully used.In addition, according to the light path principle of reversibility, also obtained utilization along the light of the path incident of reflection ray 56f.
Fig. 7 is the plan structure synoptic diagram that the another kind of the embodiment of the invention strengthens film.As shown in the figure, in the present embodiment, the cross section of overlooking that strengthens each film unit 21 of film 20 is hexagon, and the array arrangement mode of film unit 21 presents the honeycomb shown in the figure.The corresponding display element of the enhancing film of this structure is that upper and lower surface is the electric paper apparatus of hexagonal little glass of form.In this embodiment, little glass of lattice 33 are also arranged in the mode shown in Fig. 7.
As mentioned above, the reflective display of the embodiment of the invention, utilize the enhancing film 20 on the reflective display layer, the incident ray that makes part arrive this device changes the direction of propagation, make more light can incide the surface of display element 31, and change the direction of propagation when making its reflection ray carry image information again through enhancing film 20, transmit this display device and turn back in reader's the angular field of view.Pass through the solution of the present invention, strengthen effect that the film unit 21 of the given shape that film 20 has produces and be and to extend on the complete display panel that is delivered to this reflective display of the image shown in each display element and around it, filled up the image blind area thus, eliminate the image breakpoint, realized showing the continuity of image, strengthened Electronic Paper contrast of display degree on the whole.Utilize the light that incides the isolated part top on the other hand, improved the utilization factor to light, strengthened the brightness of the demonstration of reflective display.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a reflective display is characterized in that, described device comprises:
Reflective display layer comprises the isolated part between a plurality of display elements and the adjacent display element;
Strengthen film, be arranged on the described reflective display layer, the light that passes in and out described reflective display layer is reflected.
2. device as claimed in claim 1 is characterized in that, described enhancing film has and described display element film unit one to one.
3. device as claimed in claim 2 is characterized in that, the film unit that described enhancing film has is matrix Pareto diagram or honeycomb arrangement pattern.
4. device as claimed in claim 2 is characterized in that, described film unit comprises the first area that is positioned at described display element top and the second area that is positioned at described isolated part top;
Described second area makes the direction of propagation of refracted ray deflect to contiguous described display element.
5. device as claimed in claim 4 is characterized in that, described second area has big thickness.
6. device as claimed in claim 4 is characterized in that, described second area adopts big refractive index materials to make.
7. device as claimed in claim 2 is characterized in that, described film unit has the surface configuration on protruding sphere, convex arc surface or dome arc angle plane.
8. device as claimed in claim 1 is characterized in that, described reflective display layer is electrophoresis-type microcapsules formula electronic ink layer, and described display element is microcapsules, and described isolated part is the space between the adjacent described microcapsules.
9. device as claimed in claim 1 is characterized in that, described reflective display layer is the electrophoresis glass form electronic ink layer that declines, and described display element is little glass of lattice, and described isolated part is little glass of partition wall.
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