US20050162358A1 - Liquid crystal display device having stripe-shaped color filters - Google Patents
Liquid crystal display device having stripe-shaped color filters Download PDFInfo
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- US20050162358A1 US20050162358A1 US10/985,910 US98591004A US2005162358A1 US 20050162358 A1 US20050162358 A1 US 20050162358A1 US 98591004 A US98591004 A US 98591004A US 2005162358 A1 US2005162358 A1 US 2005162358A1
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- liquid crystal
- gate
- color filters
- stripe
- crystal panel
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/52—RGB geometrical arrangements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
Abstract
Description
- This application claims the benefit of Korean Patent Application No. 2000-7715, filed on Feb. 18, 2000, which is hereby incorporated by reference for all purposes as if fully set forth herein.
- 1. Field of the Invention
- The present invention relates to a liquid crystal display (LCD) device, and more particularly, to a LCD device having color filters arranged in a stripe shape.
- 2. Discussion of the Related Art
- In general, the LCD device includes a liquid crystal panel having upper and lower substrates and an interposed liquid crystal layer. The upper substrate, referred to as a color filter substrate, includes a common electrode and color filters. The lower substrate is called an array substrate and includes gate lines arranged in a transverse direction and data lines arranged in a longitudinal direction perpendicular to the gate lines. A pixel electrode is formed on a region of the lower substrate defined by the gate and data lines. Thin film transistors (TFTs) are formed as switching elements at a crossing point of the gate and data lines in a matrix. Each of the TFTs includes a gate electrode, a source electrode and a drain electrode. The drain electrode contacts the pixel electrode via a drain contact hole. Peripheral portions of the two substrates are sealed by a sealant to prevent liquid crystal leakage. The gate lines serve to transmit scanning signals to the gate electrodes, and the data lines serve to transmit data signals to the source electrodes. The data signals change alignments of the liquid crystal molecules according to the scanning signals such that the LCD device displays various gray levels.
- In such an LCD device, a driver integrated circuit (IC) that applies signals to each electrode through each line on the lower substrate may be mounted using various methods, for example, chip on board (COB), chip on glass (COG), tape carrier package (TCP), and the like.
- The COB method is conventionally adopted for a segment type LCD device, or a LCD panel having a low resolution. Since the segment type LCD device or the low resolution LCD panel uses a small number of leads, the driver IC thereof has also a small number of leads. Therefore, the driver IC thereof is first installed on a printed circuit board (PCB) having a plurality of leads, and the leads of the PCB are connected with the LCD panel via a proper method, which is relatively simple.
- However, as the LCD devices have high resolutions, a great number of leads are adopted for the driver IC. When the driver IC has a great number of leads, it is difficult to install the driver IC on the above-mentioned PCB.
- In another method, the COG method, the driver IC is directly installed on the LCD panel without interposing the PCB. Therefore, the connection between the driver IC and the LCD panel is stable, and a minute pitch is applicable for the installation of the driver IC. The COG method employs a multi-layered flexible printed circuit board (FPCB) instead of the PCB. The multi-layered FPCB contacts the LCD panel via an anisotropic conductive film (ACF) and transmits input signals to the driver IC.
- The above-mentioned COG method has advantages of low cost and high stability. However, since a pad of the LCD panel needs an additional area to install the driver IC, the LCD panel should be enlarged. In addition, when the COG method is adopted for the LCD panel, it is difficult to repair defects of the driver IC or terminal lines of the LCD panel.
- In another method, the TCP method, the driver IC is installed on a polymer film. The TCP method is widely used for LCD devices as well as mobile phones that need small, thin, and light electrical packages.
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FIG. 1 is a cross-sectional view illustrating a liquid crystal panel having a driver IC mounted thereon using the TCP technique. As shown inFIG. 1 , adriver IC 17 is mounted on apolymer film 19, and thepolymer film 19 having thedriver IC 17 is connected with both alower substrate 11 and a printedcircuit board 15 through an anisotropic conductive film (ACF) 18. Signals are applied through such a tape carrier package from one or each end portion of gate and data lines (not shown) in order to drive the liquid crystal panel having the lower andupper substrates -
FIG. 3 is a plan view illustrating a conventional quad type color LCD device. Aliquid crystal panel 111 generally includes a number of dots, and each unit pixel includes four sub-pixels or dots: an RGBW (red, green, blue, and white) arrangement as shown inFIG. 3 or an RGGB (red, green, green, and blue) arrangement (not shown). - In a large-sized LCD device employing the TFT as a switching element, when a direct current bias is applied to the liquid crystal layer, the liquid crystal layer can deteriorate. Thus, it is preferable to change a polarity of a voltage applied to the liquid crystal layer for each frame. Such inversion driving methods are classified into frame inversion, column inversion, line inversion, and dot inversion.
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FIGS. 2A to 2D are plan views illustrating the four inversion methods mentioned above. In the frame inversion driving method, as shown inFIG. 2A , all of the sub-pixels receive signals of the same polarity in one frame and in next frame all of the sub-pixels receive signals of inverse polarity.FIG. 2B illustrates the column inversion driving method, that sub-pixels of every other column receive the signals of the same polarity and the polarity of the signal is changed at the next frame.FIG. 2C illustrates the line inversion driving method, that sub-pixels of every other line (row direction) receive the signals of the same polarity and the polarity of the signal is changed at the next frame.FIG. 2D illustrates the dot inversion driving method. In the dot inversion drive method, the drive voltages applied to the pixel electrodes are such that the polarities of two adjacent pixel electrodes, which are disposed adjacent to each other in either the column or row direction, are opposite to each other with respect to the counter electrode. In other words, the polarities of the pixel electrodes with respect to the counter electrodes alternate as viewed along both the column direction and the row direction in each instance. - Through such inversion methods, cross talk and flickering of a screen can be reduced and a large-sized color LCD device is driven using such a method.
- In order to drive the LCD device, gate driver ICs and data driver ICs, which are respectively connected with data lines and gate lines, are mounted to the liquid crystal panel through various method described above. Further, the LCD device employs either a dual bank structure or a single bank structure to drive the liquid crystal layer. In the dual bank structure, the data driver ICs are arranged on both top and bottom side portions of the liquid crystal panel, or the gate driver ICs are arranged on both right and left side portions of the liquid crystal panel. In the single bank structure, the data driver ICs are all arranged on either the top or the bottom portion of the liquid crystal panel, or the gate driver ICs are all arranged on either the right or left portion of the liquid crystal panel.
- As shown in
FIG. 3 , theliquid crystal panel 111 adopts the dual bank structure that has a plurality of the driver ICs at all four sides of the liquid crystal panel. Namely, thedata driver ICs data lines 119 are arranged on both top and bottom portion of theliquid crystal panel 111, and thegate driver ICs gate lines 117 are arranged on both left and right side portions of theliquid crystal panel 111. For a more detailed explanation, the twogate driver ICs 113 a are arranged on a left side portion of theliquid crystal panel 111, and twogate driver ICs 113 b are arranged on a right side portion of theliquid crystal panel 11 in the dual bank structure. Also, the fourdata driver ICs 115 a are arranged in the top portion of theliquid crystal panel 111, and the fourdata driver ICs 115 b are arranged in the bottom portion of the liquidcrystal display panel 111 in the dual bank structure. The liquidcrystal display panel 111 can employ the dot inversion driving method or the frame inversion driving method which are described above. An external controller controls such driving methods. - At this time, according to the dual bank stricture, each of the
gate driver ICs liquid crystal panel 111 operate the even or odd numbered gate lines, respectively. Moreover, each of thedata driver ICs liquid crystal panel 111 operate the even or odd numbered data lines, respectively. For that reason, a signal difference is created between adjacent lines. -
FIG. 4 is a plan view illustrating data signal transmissions of the liquid crystal panel having a dual bank structure according to a conventional art. As shown inFIG. 4 , thedata driver ICs 115 a are arranged at the top side portion of theliquid crystal panel 111 to drive odd numbereddata line 121, and thedata driver ICs 115 b are arranged at the bottom side portion of the liquid crystal panel to drive even numbereddata line 123. Therefore, a difference of a signal delay caused by a line resistance may occur between the odd and even numbered data lines. For example, a difference of a signal delay between the two adjacent odd and even data lines may occur at portions A and A′. As a result, optical characteristics of the pixel may vary, whereby defects causing a brightness difference may occur at the portions A and A′. - Accordingly, the present invention is directed to a liquid crystal display device having stripe-shaped color filters that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
- To overcome the problems described above, a preferred embodiment of the present invention provides a liquid crystal display device which arranges color filters in a stripe shape.
- Another object of the present invention is to provide the liquid crystal display device having a high brightness and resolution.
- Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
- In order to achieve the above object, the preferred embodiments of the present invention provide a liquid crystal display device, including: a liquid crystal panel having a plurality of gate and data lines and a plurality of sub-pixels, wherein the gate lines are arranged in a transverse direction and the data lines are arranged in a longitudinal direction, wherein each sub-pixel is defined by the gate and data lines and corresponds to a stripe-shaped color filter that has one of red, green, blue and white colors; a black matrix arranged among the stripe-shaped color filters; a gate driver integrated circuit (IC) connected to the plural gate lines for driving the gate lines, the gate driver IC arranged on one side portion of the liquid crystal panel; and a data driver integrated circuit (IC) connected to the plural data lines for driving the data lines, the data driver IC arranged on one side portion of the liquid crystal panel.
- Each stripe-shaped color filter can have one of red, green, green and blue colors. The stripe-shaped color filter having a white color is made of a transparent resin, or the stripe-shaped color filter having a white color is a open portion of the black matrix.
- The principles of the present invention further provide a method of fabricating a liquid crystal display device, beneficially including: forming a plurality of gate and data lines on a first substrate; forming a black matrix on a second substrate; forming open portions for color filters by patterning the black matrix; depositing a resin on the black matrix covering the open portions, wherein the resin has one of red, green, blue and white colors; forming color filters in the open portions by photolithography, the color filters having a stripe shape; forming a liquid crystal panel by combining the first and second substrates with interposed liquid crystal; installing data driver integrated circuits (ICs) on a top or bottom side portion of the liquid crystal panel, wherein the data driver ICs drive the plural data lines; and installing gate driver integrated circuits (ICs) on one side portion of the liquid crystal panel, wherein the gate driver ICs drive the plural gate lines.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
- The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
- In the drawings:
-
FIG. 1 is a cross-sectional view illustrating a typical liquid crystal panel mounting a driver IC using the TCP technique; -
FIGS. 2A to 2D are plan views illustrating, respectively, a frame inversion driving method, a column inversion driving method, a line inversion driving method, and a dot inversion driving method; -
FIG. 3 is a plan view illustrating a quad type liquid crystal display device according to a conventional art; -
FIG. 4 is a plan view illustrating a configuration of a liquid crystal panel having a dual bank structure according to a conventional art; -
FIG. 5 is a schematic perspective view illustrating an arrangement of color filters in a stripe shape according to a preferred embodiment; -
FIGS. 6A and 6B are plan views illustrating fabrication steps of stripe-shaped color filters according to the preferred embodiment; -
FIG. 7 is a schematic plan view illustrating configuration of the liquid crystal display device having stripe-shaped color filters according to the preferred embodiment; and -
FIG. 8 illustrates line inversion driving in accordance with the preferred embodiment. - Reference will now be made in detail to the preferred embodiment, an example of which is illustrated in the accompanying drawings.
-
FIG. 5 is a schematic perspective view illustrating an arrangement of color filters in a stripe shape according to a preferred embodiment. As shown, thecolor filters 211 are formed on asubstrate 310 and are arranged in a stripe shape. Each color filter has a red, green, blue or white color. -
FIGS. 6A and 6B are plan views illustrating fabrication steps of stripe-shaped color filters according to the preferred embodiment. - Referring to
FIG. 6A , chrome oxide (CrOx) and chrome (Cr) are deposited in series on thesubstrate 310. These materials finally form ablack matrix 313. Theopen portions 311 for the color filters are formed by patterning theblack matrix 313 using a photolithography process. Thus, theblack matrix 313 is arranged among theopen portions 311 and prevents the light from leaking, and thus theblack matrix 313 raises the contrast ratio of the liquid crystal display. Theblack matrix 313 is usually made of chrome (Cr), but it can be made of an organic substance. - Referring to
FIG. 6B , a resin having reddish colored pigment is deposited on theblack matrix 313 and in the open portions 311 (seeFIG. 6A ). After that, color resist is formed on theopen portions 311, and thered color filters 411 are then formed by patterning the resin using the photolithography process. Through repeating these processes, the green and blue color filters are formed and thus the RGBW (red, green, blue and white) color filters having a stripe shape is complete. - When forming the
white color filters 413, theopen portions 311 are used “as-is.” Namely, theopen portions 311 without any resin are used as the white color filters 413. Alternatively, transparent resin can also be used as the white color filters 413. - Accordingly, the color filter substrate fabricated according to the above-mentioned method is adhered to the array substrate having the switching elements and the plural lines. The liquid crystal is interposed between the pair of substrates, and thus the liquid crystal panel is completed. After that, the data driver ICs and the gate driver ICs are installed between that liquid crystal panel and the PCB via a proper method. Thus, the LCD device is complete.
-
FIG. 7 is a schematic plan view illustrating configuration of the liquid crystal display device having stripe-shaped color filters according to the preferred embodiment. As shown, in the liquidcrystal display device 511, thedata driver ICs 513 can be arranged on either the top or bottom side portions of the liquid crystal panel, and thegate driver ICs 515 can also be arranged on either the right or left side portions. At this point, positive (+) polarity signals are applied to the sub-pixels that are connected with the odd numbered gate lines contacting thegate driver ICs 515. And the negative (−) polarity signals are applied to the sub-pixels that are connected with the even numbered gate lines. Thus, each sub-pixel of the liquid crystal panel is operated by these signals. And thus, the line inversion driving method according to the embodiment is as shown inFIG. 8 . - As described above, since the embodiment has the RGBW (red, green, blue and white) or RGGB (red, green, green, and blue) color filters in a stripe shape, the liquid crystal panel is operable in the single bank type. Thus, a difference of a signal delay between the two adjacent odd and even data or gate lines is prevented. As a result, the brightness and the resolution of the liquid crystal display are improved.
- It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/985,910 US20050162358A1 (en) | 2000-02-18 | 2004-11-12 | Liquid crystal display device having stripe-shaped color filters |
Applications Claiming Priority (4)
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KR1020000007715A KR100679521B1 (en) | 2000-02-18 | 2000-02-18 | Method for fabricating liquid crystal display device |
KR2000-7715 | 2000-02-18 | ||
US09/784,093 US6833888B2 (en) | 2000-02-18 | 2001-02-16 | Liquid crystal display device including sub-pixels corresponding to red, green, blue and white color filters |
US10/985,910 US20050162358A1 (en) | 2000-02-18 | 2004-11-12 | Liquid crystal display device having stripe-shaped color filters |
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US09/784,093 Division US6833888B2 (en) | 2000-02-18 | 2001-02-16 | Liquid crystal display device including sub-pixels corresponding to red, green, blue and white color filters |
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US20050162358A1 true US20050162358A1 (en) | 2005-07-28 |
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US09/784,093 Expired - Lifetime US6833888B2 (en) | 2000-02-18 | 2001-02-16 | Liquid crystal display device including sub-pixels corresponding to red, green, blue and white color filters |
US10/985,910 Abandoned US20050162358A1 (en) | 2000-02-18 | 2004-11-12 | Liquid crystal display device having stripe-shaped color filters |
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US09/784,093 Expired - Lifetime US6833888B2 (en) | 2000-02-18 | 2001-02-16 | Liquid crystal display device including sub-pixels corresponding to red, green, blue and white color filters |
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Also Published As
Publication number | Publication date |
---|---|
US6833888B2 (en) | 2004-12-21 |
US20010019382A1 (en) | 2001-09-06 |
KR20010081677A (en) | 2001-08-29 |
KR100679521B1 (en) | 2007-02-07 |
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