CN100432808C - Multi-region vertical alignment liquid crystal display panel and thin film transistor array thereof - Google Patents

Abstract

A multi-domain vertical alignment liquid crystal display panel and a thin film transistor array thereof are provided, wherein the thin film transistor array is mainly composed of a substrate, and a scanning wire, a data wire, a thin film transistor and a pixel electrode which are arranged on the substrate. The scanning wires and the data wires are divided into a plurality of pixel areas on the substrate, and the pixel electrodes and the thin film transistors are arranged in the pixel areas. The pixel electrode is provided with a plurality of main slits and wing slits, the wing slits are connected with the side edges of the main slits, and each main slit is provided with at least one zigzag end part. The zigzag end part is positioned at the position adjacent to the edge of the pixel electrode so as to change the direction of an electric field at the edge of the pixel electrode, and further ensure that the toppling directions of liquid crystal molecules are consistent.

Description

Multi-area vertical alignment liquid crystal display panel and its thin film transistor array

technical field

The present invention relates to a display panel, and in particular to a multi-domain vertical alignment (MVA) liquid crystal display panel and a thin film transistor array thereof.

Background technique

The rapid progress of the multimedia society is mostly due to the rapid progress of semiconductor components or display devices. As far as displays are concerned, thin film transistor liquid crystal displays (Thin Film Transistor Liquid Crystal Display, TFT-LCD) with superior characteristics such as high image quality, good space utilization efficiency, low power consumption, and no radiation have gradually become the mainstream of the market.

At present, the performance requirements of the market for LCDs are high contrast (High ContrastRatio), no gray scale inversion (No Gray Scale Inversion), small color shift (Little Color Shift), high brightness (High Luminance), and high color richness. , high color saturation, fast response and wide viewing angle. At present, technologies that can meet the requirements of wide viewing angles include twisted nematic liquid crystal (TN) plus wide viewing film (Wide Viewing Film), in-plane switching (In-plane Switching, IPS) liquid crystal display, fringe field switching ( Fringe Field Switching) liquid crystal display and multi-region vertically aligned thin film transistor liquid crystal display. Here, the known multi-domain vertical alignment liquid crystal display will be described.

1A and 1B are schematic cross-sectional views of a conventional multi-area vertically aligned liquid crystal display panel when the driving voltage is turned off and turned on, respectively. Please refer to FIG. 1A , a multi-area vertically aligned liquid crystal display panel 100 is composed of a color filter film array 102, a thin film transistor array 104, a liquid crystal layer 106, and alignment protrusions (protrusion) 108. constitute. Wherein, the liquid crystal layer 106 is disposed between the color filter 102 and the thin film transistor array 104 , and is composed of a plurality of liquid crystal molecules 105 . When the driving voltage is not turned on (V=0), the long axes of the liquid crystal molecules 105 are perpendicular to the TFT array 104 and the color filter 102 , and the liquid crystal molecules 105 adjacent to the alignment protrusions 108 have a pretilt angle.

Please refer to FIG. 1B , after turning on the driving voltage (V≠0), an electric field will be generated between the color filter 102 and the TFT array 104, and the liquid crystal molecules 105 will fall according to the direction of the electric field. Moreover, the multi-area vertically aligned liquid crystal display panel 100 changes the direction of the electric field by aligning the protrusions 108 and the slits 112 of the pixel electrodes 103, so that the liquid crystal molecules 105 can present a variety of different tilting directions after the driving voltage is turned on (such as 1B ), thereby achieving the purpose of increasing the viewing angle range of the liquid crystal display. Wherein, the alignment protrusions 108 are disposed on the color filter 102 .

FIG. 2 is another schematic cross-sectional view of the multi-area vertical alignment liquid crystal display panel 100 of FIG. 1B . Please refer to FIG. 2 , it can be seen from the principle of boundary effect in electromagnetics that the direction of the electric field at the edge of the pixel electrode 103 is opposite to the direction of the electric field at other parts of the pixel electrode 103 (here it can be assumed that a dummy alignment protrusion is arranged on the edge of the pixel electrode 103 114, as shown in FIG. 2 ), causing the liquid crystal molecules 105 at the edge of the pixel electrodes 103 to fall in the same direction, and then generate black streaks (disclination) in the region 116, so that the light transmittance of the multi-region vertically arranged liquid crystal display panel 100 decreases. And the response time increases.

Contents of the invention

In view of this, the purpose of the present invention is to provide a thin film transistor array, which can improve the light transmittance, contrast and response rate of the display panel.

Another object of the present invention is to provide a multi-area vertically aligned liquid crystal display panel, which has good light transmittance, contrast and response rate, and thus can provide excellent display quality.

The invention proposes a thin film transistor array, which is mainly composed of a substrate and scanning wiring, data wiring, thin film transistors and pixel electrodes disposed thereon. Wherein, the scanning wiring and the data wiring distinguish a plurality of pixel areas on the substrate, and the pixel electrode and the thin film transistor are arranged in the pixel area, and the thin film transistor is driven by the scanning wiring and the data wiring, and the pixel electrode Then it is electrically connected to the thin film transistor. In addition, the pixel electrode has a plurality of main slits and side slits, and the side slits are connected to the sides of the main slit, and each main slit has at least one zigzag end.

The present invention proposes a multi-area vertically aligned liquid crystal display panel, which is mainly composed of the above thin film transistor array, color filter and liquid crystal layer. Wherein, the color filter is arranged above the thin film transistor array, and the liquid crystal layer is arranged between the color filter and the thin film transistor array.

In a preferred embodiment of the present invention, the bending angle of the bending end of each main slit is, for example, between 0° and 45°.

In a preferred embodiment of the present invention, the meandering ends of the main slits are, for example, step-shaped continuous meandering ends.

In a preferred embodiment of the present invention, the above-mentioned multi-area vertically aligned liquid crystal display panel further includes a plurality of alignment protrusions disposed on the color filter. In an example, the alignment protrusions are, for example, strip-shaped alignment protrusions, and their extending direction is, for example, parallel to the extending direction of the main slits on the pixel electrodes. In addition, in another preferred embodiment, each alignment protrusion has at least one branch corresponding to the edge of the pixel electrode of the thin film transistor array.

The present invention reduces the area of black streaks in the multi-area vertically aligned liquid crystal display panel without adding additional manufacturing process and cost, thereby increasing the aperture ratio of the display panel, and improving the contrast ratio and response speed of the displayed image.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail with accompanying drawings.

Description of drawings

1A and 1B are schematic cross-sectional views of a conventional multi-area vertically aligned liquid crystal display panel when the driving voltage is turned off and turned on, respectively.

FIG. 2 is another schematic cross-sectional view of the multi-area vertical alignment liquid crystal display panel 100 of FIG. 1B .

3A is a schematic cross-sectional view of a multi-area vertically aligned liquid crystal display panel according to an embodiment of the present invention.

FIG. 3B is a schematic partial top view of the thin film transistor array in FIG. 3A .

FIG. 4 is a schematic diagram of the alignment protrusions of the multi-region vertically aligned liquid crystal display panel corresponding to the TFT array in FIG. 3B in a preferred embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a multi-domain vertical alignment liquid crystal display panel including the alignment protrusions 322 of FIG. 4 .

FIG. 6 is a schematic diagram of alignment protrusions corresponding to thin film transistor arrays of a multi-region vertically aligned liquid crystal display panel in another embodiment of the present invention. Description of main component marking

100, 300: Multi-area vertical alignment liquid crystal display panel

102, 320: color filter

103, 318: pixel electrode

104, 310: thin film transistor array

105, 332: liquid crystal molecules

106, 330: liquid crystal layer

108, 322: alignment protrusions

112: Slit

114: virtual alignment protrusions

116: area

311: Substrate

312: Scan wiring

314: Data Wiring

316: thin film transistor

317: The curved end of the main slit

318a: Main Slit

318b: Side Slits

319: Pixel area

V: driving voltage

Θ: Bending angle

Detailed ways

3A is a schematic cross-sectional view of a multi-area vertically aligned liquid crystal display panel according to an embodiment of the present invention. FIG. 3B is a partial top view of the thin film transistor array in FIG. 3A . Please refer to FIG. 3A , the multi-area vertical alignment liquid crystal display panel 300 is mainly composed of a thin film transistor array 310 , a color filter 320 and a liquid crystal layer 330 . Wherein, the color filter 320 is disposed above the TFT array 310 , and the liquid crystal layer 330 is composed of a plurality of liquid crystal molecules 332 , and is disposed between the color filter 320 and the TFT array 310 .

Please refer to FIG. 3A and FIG. 3B at the same time. The thin film transistor array 310 is mainly composed of a substrate 311, a plurality of scanning wirings 312, a plurality of data wirings 314, a plurality of thin film transistors 316 and a plurality of pixel electrodes 318 (Fig. 3B only Each of the aforementioned elements is shown for ease of illustration). Among them, the scanning wiring 312 and the data wiring 314 distinguish the pixel area 319 on the substrate 311, and the thin film transistor 316 and the pixel electrode 318 are arranged in the pixel area 319, and the thin film transistor 316 passes through the scanning wiring 312 Driven with the data wiring 314 , the pixel electrode 318 is electrically connected to the thin film transistor 316 .

Please continue to refer to FIG. 3B , the pixel electrode 318 has a plurality of main slits 318a, and each main slit 318a is connected with a plurality of side slits 318b on both sides, so as to increase the response speed of the multi-area vertically aligned liquid crystal display panel 300 . It should be noted that each main slit 318 a has at least one meandering end 317 . In other words, the edge of the main slit 318 a adjacent to the pixel electrode 318 is meandering, and the meandering angle Θ of the meandering end 317 is, for example, between 0° and 45°.

As mentioned above, when an electric field is generated between the color filter 320 and the thin film transistor array 310, the curved end 317 of the main slit 318a can make the direction of the electric field at the edge of the pixel electrode 318 consistent, so that the liquid crystal molecules 332 are on the pixel electrode. The edges of 318 are poured in the same direction, thereby avoiding black streaks here.

FIG. 4 is a schematic diagram of the alignment protrusions of the multi-region vertically aligned liquid crystal display panel corresponding to the TFT array in FIG. 3B in a preferred embodiment of the present invention. Referring to FIG. 4, in addition to using the zigzag end 318b of the main slit 318a at the edge of the pixel electrode 318 to eliminate black streaks, the present invention can also set an alignment pattern with branches 322a on the color filter 320 shown in FIG. 3A. Protrusion 322. Wherein, the extending direction of the alignment protrusion 322 is, for example, parallel to the extending direction of the main slit 418 a of the pixel electrode 418 , and the branch 322 a of the alignment protrusion 322 corresponds to the edge of the pixel electrode 318 .

FIG. 5 is a partial cross-sectional view of a multi-domain vertical alignment liquid crystal display panel including the alignment protrusions 322 of FIG. 4 . Please refer to FIG. 4 and FIG. 5 at the same time. Since the multi-region vertically aligned liquid crystal display panel 500 has main slits 318a formed on the pixel electrodes 318 and alignment protrusions 322 are provided on the color filter 320, even in The direction of the electric field near the edge of the pixel electrode 318 without the meandering end 317 can also be changed by the branch 322a of the alignment protrusion 322, so that the liquid crystal molecules 332 at the edge of the pixel electrode 318 fall in the same direction, thereby reducing The generation of dark streaks.

FIG. 6 is a schematic diagram of alignment protrusions corresponding to thin film transistor arrays of a multi-region vertically aligned liquid crystal display panel in another embodiment of the present invention. Please refer to FIG. 6 , in another preferred embodiment of the present invention, the meandering end 317 of the main slit 318a can also be a stepped continuous meandering end, which can also achieve the same effect as the above embodiment. It can be seen that, the present invention does not limit the meandering shape of the meandering end portion 317 of the main slit 318a, which can be determined by those skilled in the art according to the actual manufacturing process.

The present invention forms zigzag slits at the ends of the pixel electrodes so that liquid crystal molecules adjacent to the edges of the pixel electrodes have the same pouring direction and avoids black streaks. Moreover, the present invention can form the slits with meandering ends on the pixel electrodes only by slightly changing the known photomask pattern. In other words, the present invention can eliminate the black streaks in the multi-area vertically aligned liquid crystal display panel without adding additional manufacturing process and cost, thereby increasing the aperture ratio of the display panel, and improving the contrast of displayed images and the response speed.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (9)

1. thin film transistor (TFT) array is characterized in that comprising:

Substrate;

Plurality of scanning wirings is arranged on this substrate;

Many data wirings are arranged on this substrate, and wherein above-mentioned these scan wirings and above-mentioned these data wirings are distinguished a plurality of pixel regions on this substrate;

A plurality of thin film transistor (TFT)s are arranged on this substrate, and respectively this thin film transistor (TFT) is arranged in one of above-mentioned these pixel regions, and wherein above-mentioned these thin film transistor (TFT)s drive by above-mentioned these scan wirings and above-mentioned these data wirings; And

A plurality of pixel electrodes, be arranged on this substrate, and respectively this pixel electrode is arranged in one of above-mentioned these pixel regions, one of state on the correspondence in these thin film transistor (TFT)s to be electrically connected on, and respectively this pixel electrode has many main slits and many flank slits, wherein above-mentioned these flank slits are connected in the side of above-mentioned these main slits, and respectively this main slit has at least one tortuous end.

2. the thin film transistor (TFT) array according to claim 1, it is characterized in that respectively should the complications end angle of bank between 0 degree between 45 degree.

3. the thin film transistor (TFT) array according to claim 1 is characterized in that above-mentioned these tortuous ends are stepped continuous tortuous end.

4. multi-domain vertical alignment liquid crystal display panel is characterized in that comprising:

Thin film transistor (TFT) array comprises:

Substrate;

Plurality of scanning wirings is arranged on this substrate;

Many data wirings are arranged on this substrate, and wherein above-mentioned these scan wirings and above-mentioned these data wirings are distinguished a plurality of pixel regions on this substrate;

A plurality of thin film transistor (TFT)s are arranged on this substrate, and respectively this thin film transistor (TFT) is arranged in one of above-mentioned these pixel regions, and wherein above-mentioned these thin film transistor (TFT)s drive by above-mentioned these scan wirings and above-mentioned these data wirings;

A plurality of pixel electrodes, be arranged on this substrate, and respectively this pixel electrode is arranged in one of above-mentioned these pixel regions, one of state on the correspondence in these thin film transistor (TFT)s to be electrically connected on, and respectively this pixel electrode has many main slits and many flank slits, wherein above-mentioned these flank slits are connected in the side of above-mentioned these main slits, and respectively this main slit has at least one tortuous end;

Colored filter is arranged at this thin film transistor (TFT) array top; And

Liquid crystal layer is arranged between this thin film transistor (TFT) array and this colored filter.

5. the multi-domain vertical alignment liquid crystal display panel according to claim 4, the angle of bank that it is characterized in that above-mentioned these tortuous ends is between 0 degree is spent to 45.

6. the multi-domain vertical alignment liquid crystal display panel according to claim 4 is characterized in that above-mentioned these tortuous ends are stepped continuous tortuous end.

7. the multi-domain vertical alignment liquid crystal display panel according to claim 4 is characterized in that also comprising a plurality of orientation protrusions, is arranged on this colored filter.

8. the multi-domain vertical alignment liquid crystal display panel according to claim 7 it is characterized in that the orientation protrusion that above-mentioned these orientation protrusions are strip, and the bearing of trend of above-mentioned these strip orientation protrusions is parallel to the bearing of trend of above-mentioned these main slits.

9. the multi-domain vertical alignment liquid crystal display panel according to claim 7 it is characterized in that respectively this orientation protrusion has at least one branch, and above-mentioned these branches corresponds to the edge of above-mentioned these pixel electrodes.

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