TWI230307B - Reflective and transflective thin film transistor liquid crystal display (TFT-LCD) with higher contrast and shorter lag time using multi-domain in vertical alignment mode (MVA) - Google Patents

Abstract

A MVA reflective TFT-LCD and A MVA (at reflective area) transflective TFT-LCD structures are disclosed. A transparent flat layer and a transparent electrode with the pattern of radial fine slits are fabricated in sequence on a pre-cute reflective substrate with the bumps structure on it. A hole or a protrusion is formed at the center of the upper transparent electrode substrate relating to the position of the transparent electrode pattern. This structure not only forms the multi-domain (at the liquid crystal layer) of the vertical alignment reflective TFT-LCD, but also forms the multi-domain (at reflective area) of the transflective TFT-LCD. In this case, the arrangement of the liquid crystal molecule is stable, the view angle of this LCD is wider, and the light leaking is lower also with more intensive contrast at the same time.

Description

1230307 V. Description of the invention (1) The technical field to which the invention belongs: The present invention relates to a multi-domain vertical alignment mode (Multi-Domain

Vertical Alignment Mode (MVA) reflective thin film transistor liquid crystal display and transflective thin film liquid crystal display with MVA mode in the reflective area, especially a reflective thin film transistor liquid crystal display: and The reflective region of the transflective thin film transistor liquid crystal display is formed into a transparent electrode pattern structure with radial slits (f 丨 ne s 1 11) on a transparent flat layer to improve contrast and response speed. Prior technology: With the development of thin film transistor, rayless machine, personal digital computer and mobile phone, and the decline of the adoption cost, the problems of the polarized light direction and characteristics of the thin film transistor liquid and the angle of incident light become larger as the angle becomes larger. Seeing the rapid progress of body production technology, it has a thin, light, and liquid crystal display, which is widely used in computing devices (PDAs), watches, notebook computers, digital cameras and other electronic products. Coupled with the industry's active investment in production equipment, the production of liquid crystal displays has increased the demand for liquid crystal displays.

Crystal display (TFT —LC])) H birefringence characteristics to achieve the \ angle of ^, so the effect of this, depending on the angle of the viewer and === the nature of the contrast will be lower theft " Legacy liquid ΐ: Same! Display quality, depending on whether it is a large-scale development

Page 6 1230307 V. Description of the Invention (2)-Exhibition 'It is more important to improve the contrast and color uniformity of various perspectives. In order to further expand the application field and quality of liquid crystal displays, the current research focus of liquid crystal displays is mainly focused on how to widen the viewing angle and shorten the response time of the screen. In order to achieve the above purpose, the conventional technology has developed a variety of wide viewing angle technologies ’such as the lateral electric field switching technology (In_piane

Switching ’IPS), Fringe Fieid Switching (FFS), and Multi-Domain Vertical Alignment (MVA). However, the above-mentioned wide-viewing angle technology is still limited to transmissive TFT-LCDs. SUMMARY OF THE INVENTION An object of the present invention is to provide a reflective thin film transistor liquid crystal display with a multi-domain vertical alignment mode (MVA). TFT-LCD) and a transflective thin-film transistor liquid crystal display (transflective TFT-LCD) with an MVA mode in the reflective area. By sequentially fabricating a transparent flat layer and a transparent electrode pattern on the reflective plate, the reflective regions of the semi-transmissive TFT-LCD and the transflective TFT-LCD are formed into multiple regions and the liquid crystal molecules are arranged therein. The condition is stable, in order to improve the problem of grayscale inversion and color shift, increase its viewing angle, and make the liquid crystal in the dark state have a good vertical alignment, and reduce light leakage and increase contrast.

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The invention discloses a transparent lower substrate including a thin film transistor and a transparent insulating layer dots (bumps: plate, an undersurface of a transparent layer of the transparent flat layer, and a transparent layer), and the transparent lower substrate is located under the transparent: plate: two, Wherein the upper surface of the transparent insulating layer and the upper surface of the transparent insulating layer are made of reflection m: ΐ ΐ ::-a transparent flat layer, at least one transparent electrode pattern formed on the upper surface, and Substrate, colored 位于 on the transparent upper substrate: corresponding on-chip electrodes and on the crystal layer. The pattern and molecular layer can be aligned, low light leakage in relative holes, or the transparency exerts the effect of complete resistance of the transparent arrangement and increases Erming > Upper electrode, # In the best case, the transparent should have a phase at the position of the at least one transparent electrode pattern to make bumps of non-conductive material on the electrode there, the above electrode and the at least one When a liquid voltage between a transparent electrode pattern is applied to the liquid crystal display, a hole or protrusion of the at least one transparent electrode can make the liquid crystal state of the liquid crystal layer stable. Domain vertical alignment liquid crystal molecules mode, and the plurality of transparent flat septum such significant points of the entire liquid crystal layer: good homeotropic alignment of the liquid crystal when the dark state, from the sky

Furthermore, the present invention also reveals that the Lord of the Deer-Suppressed β > Breeder ’s penetrating semi-reflective thin-film transistor is becoming increasingly unsteady and has a fifth body; f F 4 ^ Zone and a penetrating zone. The semi-transmissive and semi-reflective holographic film solar-electron-liquid-crystal display includes a human seven-yi ^ ^ ^ A transparent lower plate containing a thin-film transistor, and an ancient Xuansu Rigan located in the reflection area-* / above the lower moon transparent substrate A transparent insulating layer, wherein the upper surface of the transparent insulating layer & θ > has a plurality of bumps,

1230307 V. Description of the invention (4) A flat layer pattern, a pole, and a top surface of the upper surface between the bump patterns of the position material in the case of a plate with color on the upper surface of the transparent plate A bright electrode plate, a bit electrode, at least one of the electrodes and a pattern of a transmission that is less than one when there are multiple states of the holes in the liquid crystal are electrically transmitted in the transmission, and a display or projection that is less transparent is made on a transparent electrode The vertical bumps of the block domain have an insulating layer for the liquid crystal, a transparent bright electrode, and an electrically conductive bright patterned non-conductive bright electrode, which can make the alignment mode at least one side of the liquid crystal good. The liquid is vertically arranged, and the transparent color filter is disposed in the transparent liquid layer, the transparent crystal molecules are transparent to the liquid having a transparent electrical layer, and the reflective plate is under the transparent optical filter layer Corresponding to the power-on and the liquid crystal layer polar pattern, the flat layer of crystal molecules is neatly arranged to reduce leakage, and the transparent pole and the pole on the transparent surface of the layer are made in the same phase. Through. The application of the transmissive light to generate a full row of shadows and adding to the upper surface of the reflective layer indicates that the lower substrate has at least one transparent upper base and a transparent upper corresponding to the state where the upper electrode is applied or where a voltage is applied to the upper electrode. Block these sounds steadily, so as to add contrast. Embodiments: The present invention provides a structure of a vertically-aligned reflective thin film transistor with a wide viewing angle, and a structure with a widened viewing angle in a reflective region of a vertically-aligned transflective thin-film transistor liquid crystal display. Wherein, a transparent flat layer is firstly formed on the entire reflective plate having a dog point structure, and then a transparent electrode pattern having a fine slit is formed on the transparent flat layer, and the corresponding transparent electrode pattern is formed on the transparent flat layer. Position of transparent electrode pattern

Page 9 1230307 V. Description of the invention (5) A hole (h〇1 e) is formed at the center of the transparent electrode on the upper substrate or a non-conductive bump (pr〇trusi〇n) is formed on the electrode at the place, In this way, not only the reflective TFT-LCD or the semi-transparent liquid crystal layer of the reflective region of the transflective TFT-LCD can be formed into multiple regions with stable liquid crystal molecule arrangement, and the liquid crystal display can have a wider viewing angle. , And can improve comparison and response speed. A detailed description of the present invention is shown below. First embodiment

FIG. 1A is a diagram showing a vertical electrode reflective TFT-LCI structure and a reflective region structure of a transflective TFT-LCD according to the present invention, in which a transparent electrode pattern having a fine slit is applied. A plan view of an embodiment, wherein the transparent electrode pattern 13 may be made of an I T0 material, and the slits 131 thereof may be formed through the remaining time, the slits; the width of the i 31 itself and the distance between them are about 3- 5 # m. Figure B shows the figure corresponding to the transparent electrode

A plan view of the transparent electrode of the upper substrate at the position where a hole is formed at the center of the transparent electrode 21 or a protrusion 211 is made on the electrode there, and the transparent electrode 21 is usually a 170 electrode The bump is made of a non-conductive material. FIG. 1C is a plan view of the upper substrate transparent electrode 21 combined with the transparent electrode pattern 13. It can be known from FIG. 1C that, since there is a hole or a bump above the center of the transparent electrode pattern 13, and there are protruding radial slits 131 around the outer edge of the transparent electrode pattern 13, when a voltage is applied to the Picture of LCD monitor

Page 10 1230307 V. Description of the invention (6) '-For a plain electrode (here the transparent electrode pattern 1 3), as far as a single transparent electrode pattern 1 3 is located, it is adjacent to the slits 1 3 1 The liquid crystal molecules will be aligned with the directions of the slits 1 3 1 and all the liquid crystal molecules will be dumped in the direction of the center ^ hole or the bump 2 1 1 to produce a quadruple division effect to achieve a wider viewing angle. the goal of. In addition, the liquid crystal molecules around the outer edge of the transparent electrode pattern 丨 3 will be affected by the arrangement of the slits 1 3 1 and will be aligned upside down, while the liquid crystal molecules closer to the inner edge of the transparent electrode pattern 13 will be subjected to the " slit The effect of the 1 3 1 arrangement is less, so a continuous domain is formed, which is very suitable for reflective # TFT —τγγ> and transflective TFT-LCD. In the following, the present invention will be described by taking the structure of the vertical alignment semi-transparent and semi-reflective T F T-L C D as an example. FIG. 2 is a cross-sectional view of a transflective TFT-LCD unit with a transparent electrode pattern according to the present invention, wherein the liquid crystal display includes a glass substrate 10 for manufacturing a TFT transistor, and The upper glass substrate 20 of the color filter. A liquid crystal layer 15 is provided between the upper and lower glass substrates 20 and 10 so as to change the alignment and arrangement of the liquid crystal molecules according to the applied voltage, and change the passage of the liquid crystal layer 1 in the transmission region A and the reflection region B. 5 light angles. A transparent organic layer having a plurality of bumps 11 is formed on the lower glass substrate 10 of the reflection area B, and then a whole piece of metal is deposited

1230307 V. Description of the invention (7)-layer, as the reflecting plate 18, and preferably, the reflecting plate 18 is floating, that is, no voltage is connected. Since the reflecting plate 18 is formed on the transparent organic layer having the plurality of bumps 11, the surface of the reflecting plate 8 is also uneven. In order to make the arrangement of the liquid crystal in the liquid crystal layer 5 completely independent of the uneven surface of the reflecting plate 18, it can be arranged more neatly. The transparent electrode pattern 13 shown in FIG. 1A is formed as Before the reflective region b controls the liquid crystal array electrode, a transparent flat layer 9 is formed on the upper surface of the reflective plate 18, and the transparent flat layer 9 may be a transparent organic layer. Next, a transparent electrode layer 2 (such as the IT 0 layer) is deposited as the day electrode in the penetrating region A and the reflection region B, and the transparent electrode layer 12 in the reflection region b is etched to produce the radioactive electrode. Transparent electrode pattern 13 in the shape of a slit (not shown). At the center of the transparent electrode 2 1 (IT0 electrode) of the upper glass substrate 20 corresponding to the position of the transparent electrode pattern 13, a bump 22 is formed. Thus, a transflective TFT-LCD having a multi-domain vertical alignment mode structure in a reflective region is formed. When a voltage is applied to the daytime electrode of the liquid crystal display, a quadruple domain and a type of continuous area are generated. In addition, since the metal reflection plate 18 under the transparent electrode pattern 13 is a whole piece, it passes through the transparent The light in the gap between the electrode patterns 3 and the slits can still be reflected and used. Furthermore, since the transparent electrode pattern is formed on the transparent flat layer 19, the liquid crystal arrangement of the liquid crystal layer 15 is not affected by the uneven bumps 11 under the reflective plate. The day-to-day LCDs have excellent vertical alignment, which reduces light leakage and increases contrast.

Page 12 1230307 V. Description of the invention (8) In the present invention, the shape of the electrode pattern of the present invention can be intersected, and the purpose of the metal transparent electrode is shown in FIG. The direct mode is a half-transmissive semi-reflective TFT-LCD unit, and the reflective area of the element forms more than one transparent electrode pattern. Figure 3 shows a top view of a semi-transparent and semi-reflective TFT-LCD unit with two transparent structures, in which the scanning line 100 and the signal line 2000 are perpendicular to the unit with a switching element TFT 1 6 And a storage electro-reflection area B, there is a whole piece of reflective plate 18 made at the bumps η and two patterns 1 3 on the transparent flat layer 19 to produce an octave division effect. In order to achieve a wider viewing angle, the multi-domain formed by each transparent electrode pattern 3 is vertically arranged with a continuous area. Second Embodiment Please refer to the figure. Transflective structure. At the actual transparent electrode, the color filter bright electrode 21 layer film (not directly aligned with the liquid crystal four, which is another display of the transflective TFT-LCD unit pixel with a transparent electrode pattern of the present invention The embodiment of the sectional junction differs from the first embodiment in that a hole 2 2 ′ is formed in the center of the transparent electrode 21 of the upper glass substrate 20 corresponding to the position of the pattern 13. The color material under the substrate 20 leaks from the hole 22 'to the liquid crystal layer 15, and a transparent protective display can be formed between the transparent and the color filter (not shown). In this way, a semi-transparent and semi-reflective TFT-LCD with a multi-domain flea structure is also formed in the reflective area. When a voltage element is applied to the daylight electrode of the display, a quadruple domain is generated and it is a

Page 13 1230307 Description of the invention (9) Type of continuous area The number, size, installation position, angle and shape of the transparent electrode pattern with radial slits used in the present invention can be seen in two aspects. Make the appropriate changes. @ The above is to make use of the scope of the present invention, and make slight changes and tune away from the spirit of the present invention. The preferred embodiments are described in detail and familiar with such artists. Clarify the invention, not the limitation

1230307 The diagram is briefly explained. The following detailed description in combination with the attached diagrams will clarify the above-mentioned technical content and many advantages of the present invention. Among them: Figure A is a radial slit (f ^ e 3 1 it ) A schematic top view of an embodiment of a transparent electrode pattern; FIG. 1B is a top view of a transparent electrode of an upper substrate at a position corresponding to the transparent electrode pattern of FIG. 1a; FIG. 1C is a substrate above β The top view of the transparent electrode combined with the transparent electrode pattern of Figure 1a; Figure 2 is a cross-sectional view of the structure of a transflective TFT-LCD unit with a transparent electrode pattern according to the present invention; The top view of the semi-transparent and semi-reflective TFT-LCD unit of the invention has two transparent electrode pattern structures, and FIG. 4 is a schematic view of the semi-transparent and semi-reflective TFT-LCD unit of the invention A structural cross-sectional view of another embodiment. Element drawing number description: Transparent electrode pattern 1 3 Slit 1 3 1 Upper substrate transparent electrode 21 hole or bump 211 Upper glass substrate 20 Lower glass substrate 10 Liquid crystal layer 1 5 Penetration area A Reflection area B Bump 11 Convex Block 22 scan line 100

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Claims (1)

1230307 VI. Scope of patent application 1. A reflective thin film transistor liquid crystal display, comprising: a transparent lower substrate containing a thin film transistor; a transparent insulating layer, which is located on the transparent lower substrate, and the transparent insulating layer The upper surface has a plurality of bumps; a reflective plate, which is made on the upper surface of the transparent insulating layer; a transparent flat layer, which is made on the upper surface of the reflective plate; at least one transparent electrode pattern, It is fabricated on the upper surface of the transparent flat layer so as to generate a liquid crystal distribution in a multi-domain vertical alignment mode when a voltage is applied to the liquid crystal display. A transparent upper substrate with a color filter layer; a transparent upper electrode on the lower surface of the color filter layer of the transparent upper substrate; and a liquid crystal layer on the transparent upper electrode and the at least one transparent electrode pattern between. 2. The reflective thin-film transistor liquid crystal display according to item 1 of the patent application scope, wherein the transparent electrode pattern is an ITO electrode with a radial slit. 3. The reflective thin film transistor liquid crystal display according to item 2 of the scope of patent application, wherein the transparent electrode pattern is an ITO electrode with fine slits around the outer edge. 4. The reflective thin film transistor liquid crystal display as described in the first patent application Page 17 1230307 6. The position indicator of the scope of patent application, wherein the transparent upper electrode has a corresponding electrode hole corresponding to the at least one transparent electrode pattern. 5. The reflective thin film transistor liquid crystal display as described in item 4 of the scope of patent application, wherein the hole of the transparent upper electrode is located at a position corresponding to the center of the at least one dimming electrode pattern. 6. The reflective thin-film transistor liquid crystal display according to item 1 of the scope of patent application, wherein the transparent upper electrode has a corresponding non-conductive bump at a position corresponding to the at least one transparent electrode pattern ( protrusion) 〇7. The reflective thin-film transistor liquid crystal display according to item 6 of the scope of the patent application, wherein the bump of the transparent upper electrode is at a position corresponding to at least the center of the bright electrode pattern. I 8 · —A semi-transparent and semi-reflective thin-film transistor liquid crystal display, the system region of which is a reflective region and a transmissive region and includes: °° is a transparent lower substrate containing a thin-film transistor; a transparent insulating layer , Which is located on the transparent lower base of the reflection area and has a plurality of bumps on the upper surface of the transparent insulating layer); a reflecting plate 'made on the upper surface of the transparent insulating layer; a transparent flat layer, which It is made on the upper surface of the reflecting plate. At least-the transparent electrode pattern t is made on the upper surface of the transparent flat layer. Page 18, 1230307, the scope of application for patents, in order to generate a liquid crystal distribution in a multi-domain vertical mode when a voltage is applied to the liquid crystal display; a transparent lower electrode, which is the transparent located in the penetrating area. The upper surface of the lower substrate is electrically connected to the at least one transparent electrode pattern;-a transparent upper mask plate with a color filter layer "· a transparent upper electrode is located on the lower surface of the color filter layer of the transparent upper substrate And located between the transparent upper electrode and the at least one transparent electrode pattern and a liquid crystal layer. ^ The transflective and transflective thin film transistor described in item 8 of the scope of the patent application = liquid crystal display, wherein the transparent electrode pattern is an ITO electrode with a fine slit. I 〇 The transflective and transflective thin film electro-crystalline liquid crystal display according to item 9 of the scope of the patent application, wherein the transparent electrode pattern is an ITO electrode with fine slits around the outer edge. II. The semi-transparent and semi-reflective thin film transistor / night crystal display device as described in item 8 of the patent claim, wherein the transparent upper electrode has a position corresponding to the at least one transparent electrode pattern. Corresponding hole. · Semi-transparent and semi-reflective thin film electric day-to-day body fluid day-and-day display as described in claim 11 of patent scope, wherein the hole of the transparent upper electrode is corresponding to 1230307 on page 19 6. Scope of patent application A position at the center of the at least one transparent electrode pattern. 1 3. The transflective and transflective thin film transistor liquid crystal display according to item 8 of the scope of the patent application, wherein the transparent upper electrode has a corresponding non-conductive at a position corresponding to the at least one transparent electrode pattern. The bump of the material. 14. The transflective and transflective thin film transistor liquid crystal display device as described in item 13 of the scope of the patent application, wherein the bumps of the transparent upper electrode are located at positions corresponding to the center of the at least one transparent electrode pattern. . Page 20