TWI230308B - Reflective and transflective thin film transistor liquid crystal display (TFT-LCD) with local multi-domain vertical alignment mode - Google Patents

Abstract

A reflective TFT-LCD with a structure of local multi-domain vertical alignment mode, and a transflective TFT-LCD with a structure of local multi-domain vertical alignment mode at its reflective area are disclosed. By fabricating bumps electrodes on a reflective substrate with bumps structure, or/and by fabricating holes on the transparent electrodes on the upper substrate at every bump at the reflective substrate, the liquid crystal layer of reflective Vertical Alignment Mode TFT-LCD or the reflective area of transflective TFT-LCD partially forms continuous multi-domain vertical alignment mode (MVA) in order to require a wider view angle without sacrificing the bumps for reflective and guiding light function.

Description

1230308 V. Description of the invention (1) The technical field to which the invention belongs ... The present invention relates to a reflective film with a local (丨 oca 丨) multi-domain vertical alignment mode (MuUi-Domain vertical Alignment j | 〇de; JiVA) Transistor liquid crystal display and transflective thin film transistor liquid crystal display with local mva mode in reflective region, especially a transflective thin film transistor liquid crystal display and transflective thin film transistor liquid crystal display A conductive bump electrode that is connected to each other, or / and a corresponding hole structure is formed at the transparent electrode of the upper substrate corresponding to each bump position of the reflective plate. Prior art

With the rapid advancement of thin-film transistor manufacturing technology and the advantages of no radiation, LCDs, personal digital assistants (PDAs), watches, mobile phones, and mobile phones have been used in various electronic products. R & D and the use of large-scale production equipment, the cost is constantly declining. 'More thin film transistor liquid crystal display (TFT-LCD) required for liquid crystal displays. B Unpolarized polarized light direction and birefringence characteristics to achieve] _ With the liquid crystal molecule rotation characteristics and The angle of the incident light is related, so the liquid crystal = j dark government effect. The problem of this angle depends on the angle of the viewer = Erbuqi essentially has different display quality depending on the viewing angle. ) ----- ::: 2 households: The lower the contrast, the more important the contrast angle and color uniformity become with the development of large-scale LCD displays. ^ The application field and product f of the extended LCD monitor

IiΓ focuses on nine research points, mainly focusing on how to widen the viewing angle and shorten the response time of the firefly. Convergence; check private f μ, + ,. ^ it violates the above purpose, the conventional technology has developed a variety of wide-viewing angle technologies, such as In-Plane

Switching (IPs), border electric field switching technology (Fringe

Switching (FFS) and multi-domain vertical alignment technology (Multi_D〇main

Vertical Alignment; MVA). However, the above-mentioned wide-viewing angle technology is still limited to application to transmissive TFT-LCDs. SUMMARY OF THE INVENTION One object of the present invention is to provide a multi-domain vertical alignment mode (MVA) with locality (10 ca). Reflective thin film transistor liquid crystal display (reflective TFT-LCD) and transflective thin film transistor liquid crystal display (transflective TFT-LCD) with local MVA mode in the reflective area. By forming a plurality of interconnected conductive bump electrodes on the reflective plate, or / and forming a corresponding electrode hole at the transparent electrode of the upper substrate corresponding to the top position of each bump of the reflective plate, The reflective TFT-LCD and the transflective type

Page 7 1230308

TFT-LCD's reflective area formation (continuous MVA) color shift problem, widening the viewing angle. Liquid crystal points of a plurality of partial continuous multi-domain vertical alignment modes in order to improve grayscale inversion and the present disclosure-a reflective thin film transistor liquid: a lower substrate, a transparent insulating layer located on the transparent lower substrate Wherein the upper surface of the transparent insulating layer has bumps, and a large reflective plate fabricated on the upper surface of the transparent insulating layer, wherein the reflective plate has a plurality of independently separate conductives connected to each other. Each bump electrode is used to generate a liquid crystal distribution in a multi-vertical alignment mode when a voltage is applied to the LCD monitor. A transparent substrate with a color filter layer is located on the transparent electrode. A transparent upper electrode on the lower surface of the color filter layer of the upper substrate and a liquid crystal layer between the transparent upper electrode and the reflective plate. In another embodiment of the reflective thin film transistor liquid crystal display of the present invention, 'The upper surface of the transparent insulating layer has a plurality of first bumps, and the reflective plate has a plurality of second bumps corresponding to the plurality of first bumps, wherein the plurality of bumps A second bump, and the transparent upper electrode has a corresponding hole at a position corresponding to the plurality of second bumps, as an electrode gap, so that when a voltage is applied to the liquid crystal display, each of the The second bump generates a liquid crystal distribution in a multi-domain vertical alignment mode.

1230308 V. Description of the invention (4) Transmissive thin film transistor liquid A transparent insulating layer, bumps, and plate of the semi-transparent semitransparent transistor, wherein the reflective plate is dependent on the liquid crystal. A transparent electrical connection on the top of the panel in the display domain vertical alignment mode, a color filter with a bright upper substrate, and a liquid crystal layer therebetween. The other one of the liquid crystal display has a plurality of first protrusions and a plurality of first protrusions. The transparent upper electrode has corresponding holes, and when the crystal display is used, the liquid crystal is distributed. Furthermore, the present invention is a crystal display, which has a thin-film transistor liquid crystal display panel, and the transparent insulating layer is located in the reflective area. The transparent insulating layer is made when the transparent insulation has interconnected multiple separate conductive protrusions. A reflecting plate distributed on the lower electrode, wherein a reflecting plate on the lower surface of the light-transmitting layer of the transparent color filter layer and the transparent upper surface of the transflective embodiment of the present invention, the transmitting point is A second bump is provided, wherein the second bumps correspond to the plurality of first electrode gaps, and each second bump generates an embodiment: a semi-transparent and semi-reflective region and a penetrating region are disclosed. The indicator comprises a thin film containing a plurality of layers on the upper surface of the transparent lower substrate. The upper surface has a plurality of independently separated (i η point electrodes). The electrode is used to generate a multi-penetration area when a voltage is applied. The upper surfaces of the transparent lower base electrode and the reflective plate upper substrate, the transparent upper electrode, and the semi-reflective thin film transistor transparent insulating layer located on the electrode and the transparent lower electrode have corresponding upper surfaces corresponding to the plurality. The second bump and the position of the two bumps have a multi-domain vertical alignment mode when electricity is applied.

Page 9 1230308 V. Description of the invention (5) The present invention provides a vertically-aligned reflective thin-film transistor liquid crystal display structure with a wide viewing angle and a semi-transmissive semi-reflective thin-film transistor liquid-crystal liquid crystal display in a vertical alignment. The area can widen the structure of the viewing angle. Among them, the entire metal reflection plate having a plurality of bump structures is used to form conductive bump electrodes that are connected and connected to each other (and outside the conductive bump electrodes, it is like forming a non-conductive network structure ), Or / and a corresponding hole is formed at the transparent electrode of the upper substrate corresponding to the top position of the bumps, so that not only the reflective TFT-LCD or the transflective type The liquid crystal layer of the reflective area of the TFT-LCD forms a multi-domain vertical alignment mode (MVA) around each bump (ie, a local area), so that the liquid crystal display has a wider viewing angle without affecting the bumps. Point the main reflective light guide function. In the following, the present invention is described in detail by taking the structure of a vertically-aligned transflective TFT_LCD as an example. First Embodiment FIG. 1 shows a cross-sectional structure of a semi-transmissive and semi-reflective TFT-LCD unit pixel having a conductive bump electrode in a reflective region according to the present invention. The liquid crystal display includes a TFT transistor (not shown). ) A lower glass substrate 10, and an upper glass substrate 20 for making a color filter (not shown). A liquid crystal layer 25 is provided between the upper and lower breaking substrates 20 and 10 so that

Page 10 1230308 V. Description of the invention (6) The voltage of the invention changes the alignment and arrangement of the liquid crystal molecules, and changes the angle of light passing through the liquid crystal layer 25 in the transmission region A and the reflection region B. A transparent electrode 21 (IT 0 electrode) is formed on the lower surface of the color filter layer of the upper glass substrate 20. A transparent electrode layer 12 (for example, an ITO layer) is deposited on the lower glass substrate 10 in the penetrating region A to serve as a day electrode in the penetrating region A. 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 metal layer is deposited as the reflection plate 13. Since the reflection plate 13 is formed on the transparent organic layer having the plurality of bumps 11, the surface of the reflection plate 13 also has the bump structure 11 '. Next, most of the metal conductive layers at the lowest point (the distance between each other is about 3-5 # m) between the bumps 1 1 ′ and the bumps 1 1 of the whole metal reflection plate 13 are etched away, Form conductive bump electrodes 14 with gaps 15 and form some conductive bridge metals 18 (shown in FIG. 2) between the bumps and bumps, so that each conductive bump electrode 14 can They are connected to each other and used as daylight electrodes in the reflection area B. In the preferred case, each conductive bump electrode 14 contains only two conductive bridge metals 18. FIG. 2 is a top view showing a transflective TFT-LCD unit pixel of the present invention having a conductive bump electrode, in which a scanning line 100 and a signal line 2000 intersect perpendicularly, and the unit pixel has A switching element TFT 16 and a storage capacitor 17. In the reflection area B, the reflection plate 13 has a conductive bridge metal

1230308

V. Description of the invention (7) 1 8 The earthen vehicle j-fr bumps the electrode 14 into a plurality of conductive bump electrodes 14 which are turned on. Each conductive bump) is the lowest point around 2 f (except for the conductive bridge metal 1 8 connected to it; the organic dielectric layer is like a slit, so the liquid Si A is along each The conductive trench electrodes U are arranged around the trenches, so that the bumps 1 and 1 have a multi-domain vertical alignment pattern. In fact, this conductivity is strong: the structure 14 will cause strong oblique electricity, and isopotential lines. The density makes the liquid crystal molecules in its surroundings produce a non-coplanar, J and local continuous multi-domain vertical alignment θ μ ★ rm + · MVA) effect, check & 1 alignment fork (contlnu〇us and He achieves the purpose of widening the viewing angle. Figure 3 is the conductive bump electrode of the present invention Lei Lei Tiangang ~ needle sentence electricity% to make the liquid crystal molecular shape around the conductive large "dip electrode" hit π m 乂The simulation results of the continuous and unbalanced field dumping & field arrangement distribution. ^ 'Electricity', two conductive bump electrodes 丨 4 of _ ^ ^ ^ "electrode gap" can be seen from Figure 3, in the electrode Lack ~ electricity, the electric field at ra r 1, soil, and defect is small but the cell gap is smaller However, in the conductive process: the electric field at the point electrode 14 on the day of the sun is large but the interval between the night and day is small, so that the two regions become multiple areas with uniform brightness. The β phase difference will be similar, For the second embodiment, please refer to FIG. 4 and FIG. 5, which are cross-sectional structures of another embodiment of a display-type TFT-LCD unit in which a daylight element is formed in a reflective region and a semi-transmissive semi-reflective mode is provided. ^ Lianbin multi-domain vertical distribution 1230308 V. Description of the invention (8) In this embodiment, 'the upper glass substrate 2 is located at the top position corresponding to each of the protrusions 11' of the whole metal reflection plate 13. At the transparent electrode 21, a corresponding hole 22 is formed as an electrode notch. The shape of the hole 22 may be similar to the shape of the bump 11, such as a circle or an oval. Of course, in order to prevent the above The color filter material under the glass substrate 20 leaks from the hole 22 to the liquid crystal layer 25, and a transparent protective film (not shown) can be formed between the transparent electrode 21 and the color filter (not shown). ). In this way, when a voltage is applied,丨 丨 Around, the effect of forming a round, vertical, and vertical alignment mode Mva) is shown in the third embodiment /, and FIG. 7, which respectively show the semi-transparent and semi-reflective type of the present invention \ The FPLCD unit pixel forms a partial continuous multi-domain vertical alignment pattern in the reflective region. Another cross-sectional structure and a plan view combining the structure of the first embodiment and the second embodiment, that is, in the reflective region 22 22 13 'Produce a plurality of conductive electrodes 14 connected to each other with a conductive bridge metal 18 and connect them at a transparent electrode 21 on the upper glass substrate 2G corresponding to the plurality of conductive bump electrodes 1 4, Forming—corresponding to 22 holes per acre, as an electrode defect, to form—the effect of a local continuous multi-domain vertical alignment pattern. $ ^ 1230308

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The following detailed description is combined with the attached drawings to describe the many advantages of the present invention, among which: When the above-mentioned technology is understood: d: ί The invention of the transflective TFT-LCD unit is reflective. Schematic cross-sectional view of a structure with a conductive bump electrode;-prime in the reverse == is a semi-transparent and semi-reflective type of the present invention-l⑶ a top view of a unit with a conductive bump electrode in the shooting area; once the conductive bump of the invention The oblique electric field of the electrode makes the surrounding ...

FIG. Is a structural cross-sectional view of a second embodiment of the continuous multi-domain vertical alignment mode in which the transflective TFT-LCD unit pixels of the present invention are partially inverted; FIG. F is the present invention The second embodiment of the continuous transflective TFT-LCD unit pixel of the transflective TFT-LCD unit pixel in the reflective area is partially localized. FIG. 7 is a transflective TFT-LCD of the present invention. A top view of a third embodiment of the unit pixel forming a local continuous multi-domain vertical alignment pattern in the reflection area; and

FIG. 7 is a cross-sectional view of the structure of the third embodiment of the semi-transparent and semi-reflective TFT-LCD unit of the present invention forming a local continuous multi-domain vertical alignment pattern in the reflection area. Component drawing number description:

Page 15 1230308 Schematic description of the reflector 1 3 Transparent electrode on the upper substrate 2 1 Conductive bump electrode 1 4 Liquid crystal layer 2 5 Reflective area B Hole 2 2 Signal line 2 00 Storage capacitor 1 7 Gap, electrode gap 1 5 Glass substrate 2 0 Lower glass substrate 1 0 Conductive bridge metal 1 8 Penetration area A Bump 11, 1 Γ Scan line 1 0 0 TFT 16 Transparent electrode layer 1 2

Page 16

Claims (1)

1230308 VI. Scope of patent application1. 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 reflecting plate is fabricated on the upper surface of the transparent insulating layer and has a plurality of independently separate conductive bump electrodes connected to each other, wherein When the voltage is applied to the liquid crystal display, each conductive bump electrode is used to generate a liquid crystal distribution in a multi-domain vertical alignment mode; a transparent upper substrate with a color filter layer; a transparent upper electrode located on the transparent upper substrate A lower surface of the color filter layer; and a liquid crystal layer located between the transparent upper electrode and the reflection plate. 2 · The reflective thin film transistor liquid crystal display according to item 1 of the scope of the patent application, wherein the plurality of conductive bump electrodes are connected to each other by a conductive bridge metal, and the conductive bridge metals are located at a plurality of conductive bumps. The lowest point between the electrodes. 3. According to the application, the reflective thin film transistor liquid crystal display device described in the second item, wherein each conductive bump electrode has two conductive bridge metals. 4. The reflective thin-film transistor liquid crystal display as described in item 1 of the scope of the patent application, wherein the transparent upper electrode is connected to each of the conductive bumps electrically. 1230308 VI. Scope of patent application The top position 'has a corresponding electrode hole. 5. 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 upper surface of the transparent insulating layer has a plurality of First bumps () · a reflective plate made on the transparent insulating layer 'two 3 surfaces' and having a plurality of second bumps, wherein the plurality of second bumps correspond to the plurality of First bump A transparent upper substrate with a color filter layer; a transparent upper electrode located on the lower surface of the color filter layer of the transparent upper substrate; and the transparent upper electrode is corresponding to the plurality of second bumps Position, with a corresponding hole as an electrode gap, so that when a voltage is applied to the liquid crystal display, each second bump produces a liquid crystal distribution in a multi-domain vertical alignment mode; and a liquid crystal layer is located at Between the transparent upper electrode and the reflection plate. 6. The reflective thin film transistor liquid crystal display according to item 5 of the scope of patent application, wherein the hole of the transparent upper electrode is at a position corresponding to the top of the second protrusion. 7 · A transflective transflective thin film transistor liquid crystal display, which is divided into " reflection area and a transmissive area and includes: a transparent lower substrate containing a thin film transistor; Page 18 1230308 VI. Patent application scope A transparent insulating layer is located on the transparent lower substrate in the reflective area, and the upper surface of the transparent insulating layer has a plurality of bumps; a reflective plate, which is Fabricated on the upper surface of the transparent insulating layer and having a plurality of independently separate electrical bump electrodes connected to each other, wherein when a voltage is applied to the liquid crystal display, each of the 'electric bump electrodes is used to generate A liquid crystal distribution in a multi-domain vertical alignment mode; ~ a transparent lower electrode, which is located on the transparent lower substrate in the penetrating area and is electrically connected to the reflective plate;: transparent with a color filter layer A substrate; a transparent upper electrode located on the lower surface of the color filter layer of the transparent upper substrate; and: a liquid crystal layer 'located between the transparent upper electrode and the reflection plate and the transparent electrode and the transparent lower electrode. The above 8 j * body ^ t please refer to the semi-transparent and semi-reflective thin film electro-crystalline gold = crystal display described in item 7 of the patent scope, wherein the plurality of conductive bump electrodes are connected to each other by a conductive bridge, and the The isoconducting bridge metal is located at the lowest point between the two conductive electrodes. Large ,,,, and iJ: The semi-transmissive and semi-reflective thin-film transistor metal described in item 8 of Fan J. For /, each conductive bump electrode has two conductive bridges 1230308 VI. Application for patent scope 1 〇 The transflective and transflective thin film transistor liquid crystal display as described in item 7 of the scope of patent application, wherein the transparent upper electrode is at a position corresponding to the top of each conductive bump electrode , With, corresponding holes. 11 · A semi-transmissive and semi-reflective thin-film transistor liquid crystal display, which is divided into a reflective region and a transmissive region and includes: a transparent lower substrate containing a thin-film transistor; a transparent insulating layer located on the reflection Area of the transparent lower substrate Surface 'and the upper surface of the transparent insulating layer has a plurality of first bumps; a reflecting plate is fabricated on the upper surface of the transparent insulating layer and has a plurality of first bumps; A plurality of second bumps, wherein the plurality of second bumps correspond to the plurality of first bumps; a transparent lower electrode, which is located on the transparent lower substrate in the penetrating region, and reflects the reflection The board is electrically connected; a transparent upper substrate with a color filter layer; A transparent upper electrode is located under the color filter layer of the transparent upper substrate ^, and the transparent upper electrode has a corresponding hole at a position corresponding to the plurality of second bumps, which serves as an electrode gap So as to apply; when the liquid crystal display, each second bump generates a liquid crystal distribution in a multi-domain vertical = vertical mode; and the thunder crystal layer is located on the transparent upper electrode and the reflective plate and the transparent Between the electrode and the transparent lower electrode. Page 20 1230308 VI. Application for patent scope 1 2. The transflective and transflective thin film transistor liquid crystal display as described in item 11 of the scope of patent application, wherein the hole of the transparent upper electrode is corresponding to that of the first The position of the top of the second protrusion. Page 21