GB2425641A - Multi-domain vertical alignment liquid crystal display with slits to pixel electrode - Google Patents

Multi-domain vertical alignment liquid crystal display with slits to pixel electrode Download PDF

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Publication number
GB2425641A
GB2425641A GB0608129A GB0608129A GB2425641A GB 2425641 A GB2425641 A GB 2425641A GB 0608129 A GB0608129 A GB 0608129A GB 0608129 A GB0608129 A GB 0608129A GB 2425641 A GB2425641 A GB 2425641A
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United Kingdom
Prior art keywords
disposed
thin film
substrate
liquid crystal
film transistor
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Granted
Application number
GB0608129A
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GB2425641B (en
GB0608129D0 (en
Inventor
Chen-Chi Lin
Kuang-Hsiang Lin
Ching-Yi Chen
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Chunghwa Picture Tubes Ltd
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Chunghwa Picture Tubes Ltd
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Publication of GB0608129D0 publication Critical patent/GB0608129D0/en
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Expired - Fee Related legal-status Critical Current
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Classifications

    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134336—Matrix
    • 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
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells

Abstract

A multi-domain vertical alignment liquid crystal display panel and a thin film transistor array thereof are provided. The thin film transistor array comprises a substrate, scan lines, data lines, thin film transistors, and pixel electrodes, wherein the scan lines, the data lines, the thin film transistors, and the pixel electrodes are disposed on the substrate. The scan lines and the data lines define a plurality of pixel regions on the substrate, and the pixel electrodes and the thin film transistors are disposed in the pixel regions. Each pixel electrode has a plurality of main slits and a plurality of fine slits disposed by the sides of the main slits. At least one end of each main slit in the periphery of the corresponding pixel electrode is curved for modifying the peripheral electric field of the pixel electrode, thus liquid crystal molecules can tilt in a regular direction.

Description

MULTI-DOMAIN VERTICAL ALIGNMENT LIQUID CRYSTAL DISPLAY PANEL
AND THIN FILM TRANSISTOR ARRAY THEREOF
BACKGROUND OF THE INVENTION
Field of the Invention
10001] The present invention generally relates to a display panel. More particularly, the present invention relates to a multi-domain vertical alignment liquid crystal display panel and a thin film transistor array thereof.
Description of Related Art
100021 As multi-media technology advances, a variety of semiconductor devices or displays have been rapidly developed. The thin film transistor liquid crystal display (TFT-LCD) has such advantages as high resolution, high space- effectiveness, low power consumption and no radiation, and has become the main trend in this industry.
10003] To date, the liquid crystal displays with high contrast ratio, no gray scale inversion, little color shift, high luminance, full color, high brightness, high responsive speed and wide view angle are required. In order to achieve the purpose of wide view angle, some displays, such as TN liquid crystal complying with wide viewing film display, in-plane switching display (IPS), fringe field switching display and multi-domain vertical alignment display (MAV), are developed to perform the purpose.
Following are the descriptions of the conventional multi-domain vertical alignment liquid crystal display.
4] Fig. IA and lB are cross-sectional views schematically illustrating a conventional MVA-LCD panel under off-state and on-state according to a driving voltage. Referring to Fig. 1A, the conventional MVA-LCD panel 100 comprises a color filter 102, a thin film transistor (TFT) array 104, a liquid crystal layer 106, and alignment protrusions 108. Wherein the liquid crystal layer 106, comprising a plurality of liquid crystal molecules 105, is disposed between the color filter 102 and the TFT array 104. In the off-state without applying the driving voltage (V=0), the major axis of the liquid crystal molecules 105 are perpendicular to the color filter 102 and the TFT array 104. Particularly, the liquid crystal molecules 105 nearby the alignment protrusions 108 possess a pre-tilt angle.
OOO5J Referring to Fig. I B, an electric field is generated between the color filter 102 and the TFT array 104 by applying the driving voltage (V!=0), and the liquid crystal molecules 105 is oriented along the direction of the electric field. Furthermore, as applying the driving voltage, the liquid crystal molecules 105 tilt in different directions by the alignment protrusions 108 on the color filter 102 and slits 112 of pixel electrodes 103 in the MVA-LCD panel 100 for providing a wide view angle.
100061 Fig. 2 is another cross-sectional view schematically illustrating the MVA-LCD panel 100 shown in Fig. lB. Referring to the boundary effect introduced in electromagnetism, the direction of the electric field at the edge of the pixel electrodes 103 is opposite to the electric field at other portion of the pixel electrodes 103, wherein a dummy alignment protrusion 114 disposing at the edge of the pixel electrodes 103 can be proposed. Owing to different tilting directions of the liquid crystal molecules 105 at the edge of the pixel electrodes 103, a disclination may be generated in region 116.
Furthermore, the light transmission of the MVA-LCD panel 100 goes inferior, and the response time increases.
SUMMARY OF THE INVENTION
100071 Accordingly, the present invention is directed to a TFT array for improving light transmission, contrast ratio, and response speed of a display panel.
100081 The present invention is also directed to a MVA-LCD panel, which has superior light transmission, contrast ratio, response speed, and thus provides fine display quality.
9] The present invention provides a TFT array, which comprises a substrate; a plurality of scan lines, disposed on the substrate; a plurality of data lines, disposed on the substrate, wherein the scan lines and the data lines define a plurality of pixel regions on the substrate; a plurality of TFTs, disposed on the substrate, wherein each TFT is disposed in one of the pixel regions and driven by the corresponding scan line and the corresponding data line; and a plurality of pixel electrodes, disposed on the substrate, wherein each pixel electrode is located in one of the pixel regions and coupled to the corresponding TFT. In addition, each pixel electrode has a plurality of main slits and a plurality of fine slits disposed by the sides of the main slits, wherein at least one end of each main slit in the periphery of the corresponding pixel electrode is curved.
0] The present invention also provides a multi-domain vertical alignment (MVA) liquid crystal display (LCD) panel, which comprises the TFT array mentioned above, a color filter, and a liquid crystal layer. Wherein, the color filter is disposed over the TFT array, and the liquid crystal layer is disposed between the TFT array and the color filter.
[00111 According to an embodiment of the present invention, the end of each main slit is curved at a deflection angle between 0 degree and 45 degree.
100121 According to an embodiment of the present invention, each curved end takes a zigzag shape.
3] According to an embodiment of the present invention, the MVA-LCD panel further comprising a plurality of alignment protrusions, which are disposed on the color filter. For example, the alignment protrusions may take stripe shapes and are parallel to the alignment protrusions. In addition, each alignment protrusion may have at least one branch, and the branches of the alignment protrusions are corresponding to the edges of the pixel electrodes.
[00141 The present invention is capable of reducing the region of disclination in the MVA-LCD panel and increasing the aperture ratio of the display panel without any additional process and cost. Furthermore, the contrast ratio and the response time of the displaying image can also be improved.
BRIEF DESCRIPTION OF THE DRAWINGS
100151 The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
6] Fig. IA and lB are cross-sectional views schematically illustrating a conventional MVA-LCD panel under off-state and on-state according to a driving voltage.
100171 Fig. 2 is another cross-sectional view schematically illustrating the MVA-LCD panel shown in Fig. lB.
100181 Fig. 3A is a cross-sectional view schematically illustrating a MVALCD panel according to an embodiment of the present invention.
10019] Fig. 3B is a top view schematically illustrating a TFT array shown in Fig. 3A.
100201 Fig. 4 is a cross-sectional view of the MVA-LCD panel, as shown in Fig. 3B, having alignment protrusions correspondingly disposed over the TFT array.
100211 Fig. 5 is a cross-sectional view schematically illustrating a MVALCD panel having alignment protrusions shown in Fig. 4.
100221 Fig. 6 is a cross-sectional view schematically illustrating a MVALCD panel according to another embodiment of the present invention, wherein the alignment protrusions are correspondingly disposed over the TFT array.
DESCRJPTION OF THE EMBODIMENTS
100231 Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
[00241 Fig. 3A is a cross-sectional view schematically illustrating a MVALCD panel according to an embodiment of the present invention. Fig. 3B is a top view schematically illustrating a TFT array shown in Fig. 3A. Referring to Fig. 3A, the MVA-LCD panel 300 mainly comprises a TFT array 310, a color filter 320, and a liquid crystal layer 330. Wherein, the color filter 320 is parallel to the TFT array 310, and the liquid crystal layer 330, comprising a plurality of liquid crystal molecules 332, is disposed between the color filter 320 and the TFT array 310.
100251 Referring to both Fig. 3A and 3B, the TFT array mainly comprises a substrate 311, a plurality of scan lines 312, a plurality of data lines 314, a plurality of TFTs 316, and a plurality of pixel electrodes 318. Wherein, the scan lines 312 and the data lines 314 define a plurality of pixel regions 319 on the substrate 311, and the TFTs 316 and the pixel electrodes 318 are disposed in the pixel regions 319. The pixel electrodes 318 are coupled to the TFTs 316, and the TFTs 316 are driven by the scan lines 312 and the data lines 314.
100261 Referring to Fig. 3B, each pixel electrode 318 has a plurality of main slits 31 8a and a plurality of fine slits 31 8b disposed by the sides of the main slits 31 8a. The fine slits 31 8b are capable of improving the response time of the MVA-LCD panel 300.
It should be noted that each main slit 31 8a has at least one curved end 317. Specifically, the main slit 31 8a in the periphery of the corresponding pixel electrode 318 is curved, wherein the curved end 317 has a deflection angle between 0 degree and 45 degree.
100271 According to the embodiment mentioned above, as applying a driving voltage between the color filter 320 and the TFT array 330, the generated electric fields at the edge of the pixel electrodes 318 are modified by the effect of the curved ends 317.
Therefore, the liquid crystal molecules 332 at the edge of the pixel electrodes 318 tilt in a regular direction, thus the phenomenon of disclination can be prevented.
100281 Fig. 4 is a cross-sectional view of the MVA-LCD panel, as shown in Fig. 3B, having alignment protrusions correspondingly disposed over the TFT array. Referring to Fig.4, besides using the curved ends 31 8b of the main slits 31 8a in the periphery of the pixel electrodes 318, the present invention can further forming alignment protrusions 322 with branches 322a on the color filter 320, as shown in Fig. 3A, for diminishing the disclination. Wherein, the alignment protrusions 322 are parallel to the main slits 41 8a of the pixel electrodes 418, and the branches 322a of the alignment protrusions 322 are corresponding to the edge of the pixel electrodes 318.
100291 Fig. 5 is a cross-sectional view schematically illustrating a MVALCD panel having alignment protrusions 322 shown in Fig. 4. Referring to Fig. 4 and 5, the pixel electrodes 318 have the main slits 318a and the alignment protrusions 322 are disposed on the color filter 320. It should be noted that the direction of the electric fields at the edge of the pixel electrodes 318 can further be modified only by using the branches 322a of the alignment protrusions 322 and without forming any curved ends 317 of the main slits 31 8a. The liquid crystal molecules 332 at the edge of the pixel electrodes 318 can still tilt in a regular direction, thus the phenomenon of disclination can also be prevented.
[00301 Fig. 6 is a cross-sectional view schematically illustrating a MVALCD panel according to another embodiment of the present invention, wherein the alignment protrusions are correspondingly disposed over the TFT array. Referring to Fig. 6, the curved ends 317 of the main slits 31 8a can further take zigzag shapes, which can also achieve the purposes of the present invention as the previous embodiment mentioned above. Certainly, the type of the curved ends 317 of the main slits 31 8a in the present invention is not limited, and one of ordinary skill in the art may select the type of the curved ends 317 according to a preferred process.
1] The present invention forms the curve ends of the pixel electrodes for orienting the liquid crystal molecules along a regular direction and thus preventing the phenomenon of the disclination at the edge of the pixel electrode. Furthermore, the present invention can form the slits having curved ends on the pixel electrodes by simply modifying the pattern of the conventional mask. In other words, the present invention is capable of reducing the region of disclination in the MVA-LCD panel and increasing the aperture ratio of the display panel without any additional process and cost.
Furthermore, the contrast ratio and the response time of the displaying image can also be improved.
100321 It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.

Claims (11)

  1. WHAT IS CLAIMED IS: 1. A thin film transistor array, comprising: a
    substrate; a plurality of scan lines, disposed on the substrate; a plurality of data lines, disposed on the substrate, wherein the scan lines and the data lines define a plurality of pixel regions on the substrate; a plurality of thin film transistors, disposed on the substrate, wherein each thin film transistor is disposed in one of the pixel regions and driven by the corresponding scan line and the corresponding data line; and a plurality of pixel electrodes, disposed on the substrate, wherein each pixel electrode is located in one of the pixel regions and coupled to the corresponding thin film transistor, and each pixel electrode has a plurality of main slits and a plurality of fine slits disposed by the sides of the main slits, wherein at least one end of each main slit in the periphery of the corresponding pixel electrode is curved.
  2. 2. The thin film transistor array according to claim 1, wherein the end of each main slit is curved at a deflection angle between 0 degree and 45 degree.
  3. 3. The thin film transistor array according to claim 1, wherein each curved end takes a zigzag shape.
  4. 4. A multi-domain vertical alignment liquid crystal display panel, comprising: a thin film transistor array, comprising: a substrate; a plurality of scan lines, disposed on the substrate; a plurality of data lines, disposed on the substrate, wherein the scan lines and the data lines define a plurality of pixel regions on the substrate; a plurality of thin film transistors, disposed on the substrate, wherein each thin film transistor is disposed in one of the pixel regions and driven by the corresponding scan line and the corresponding data line; a plurality of pixel electrodes, disposed on the substrate, wherein each pixel electrode is located in one of the pixel regions and coupled to the corresponding thin film transistor, and each pixel electrode has a plurality of main slits and a plurality of fine slits disposed by the sides of the main slits, wherein at least one end of each main slit in the periphery of the corresponding pixel electrode is curved; a color filter, disposed over the thin film transistor array; and a liquid crystal layer, disposed between the thin film transistor array and the color filter.
  5. 5. The multi-domain vertical alignment liquid crystal display panel according to claim 4, wherein the end of each main slit is curved at a deflection angle between 0 degree and 45 degree.
  6. 6. The multi-domain vertical alignment liquid crystal display panel according to claim 4, wherein each curved end takes a zigzag shape.
  7. 7. The multi-domain vertical alignment liquid crystal display panel according to claim 4, further comprising a plurality of alignment protrusions, which are disposed on the color filter.
  8. 8. The multi-domain vertical alignment liquid crystal display panel according to claim 7, wherein the alignment protrusions take stripe shapes and are parallel to the alignment protrusions.
  9. 9. The multi-domain vertical alignment liquid crystal display panel according to I..)J, claim 7, wherein each alignment protrusion has at least one branch, and the branches of the alignment protrusions are corresponding to the edges of the pixel electrodes.
  10. 10. A thin film transistor array, substantially as hereinbefore described, with reference to, and as shown in, Figures 3A, 3B, 4, 5 and 6 of the accompanying drawings.
  11. 11. A multi-domain vertical alignment liquid crystal display panel, substantially as hereinbefore described, with reference to, and as shown in, Figures 3A, 3B, 4, 5 and 6 of the accompanying drawings.
GB0608129A 2005-04-27 2006-04-25 Multi-domain vertical alignment liquid crystal display panel and thin film transistor array thereof Expired - Fee Related GB2425641B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW94113400A TWI322314B (en) 2005-04-27 2005-04-27 Multi-domain vertical alignment liquid crystal display panel and thin film transistor array substrate thereof

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GB0608129D0 GB0608129D0 (en) 2006-06-07
GB2425641A true GB2425641A (en) 2006-11-01
GB2425641B GB2425641B (en) 2007-07-04

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FR (1) FR2885232A1 (en)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110850645A (en) * 2013-08-02 2020-02-28 三星显示有限公司 Liquid crystal display device with a light guide plate

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102242084B1 (en) * 2014-09-16 2021-04-21 삼성디스플레이 주식회사 Curved display device
CN112596315B (en) * 2020-12-15 2022-09-09 京东方科技集团股份有限公司 Array substrate, preparation method thereof and display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1398658A1 (en) * 2002-09-10 2004-03-17 Obayashiseikou Co., Ltd. Color active matrix type vertically aligned mode liquid cristal display and driving method thereof
JP2004258598A (en) * 2003-02-26 2004-09-16 Obayashi Seiko Kk Wide viewing angle high-speed response liquid crystal display device
US20060071927A1 (en) * 2004-10-04 2006-04-06 Samsung Electronics Co., Ltd. Liquid crystal display and driving method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1398658A1 (en) * 2002-09-10 2004-03-17 Obayashiseikou Co., Ltd. Color active matrix type vertically aligned mode liquid cristal display and driving method thereof
JP2004258598A (en) * 2003-02-26 2004-09-16 Obayashi Seiko Kk Wide viewing angle high-speed response liquid crystal display device
US20060071927A1 (en) * 2004-10-04 2006-04-06 Samsung Electronics Co., Ltd. Liquid crystal display and driving method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110850645A (en) * 2013-08-02 2020-02-28 三星显示有限公司 Liquid crystal display device with a light guide plate

Also Published As

Publication number Publication date
GB2425641B (en) 2007-07-04
TWI322314B (en) 2010-03-21
DE102006019371A1 (en) 2006-12-14
TW200638137A (en) 2006-11-01
FR2885232A1 (en) 2006-11-03
GB0608129D0 (en) 2006-06-07

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Effective date: 20200425