WO2014015617A1

WO2014015617A1 - Array substrate and display device

Info

Publication number: WO2014015617A1
Application number: PCT/CN2012/086228
Authority: WO
Inventors: 孙双
Original assignee: 京东方科技集团股份有限公司
Priority date: 2012-07-25
Filing date: 2012-12-07
Publication date: 2014-01-30
Also published as: CN102819138A

Abstract

An array substrate and a display device. The array substrate (1) comprises a colour film and an array which are formed on an underlay substrate, and the array is located on the colour film. By arranging the array on the colour film, forming a groove on the surface of a transparent layer (6) of the colour film, and arranging a gate electrode (8) and/or a gate line of the array in the groove, on the one hand, the overall thickness of a liquid crystal display device can be reduced to enable the liquid crystal display device to be thinner and lighter; and on the other hand, the flatness of the liquid crystal display device can be increased, thereby being able to reduce the poor display phenomena of the liquid crystal display device.

Description

Array substrate and display device

Embodiments of the present invention relate to an array substrate and a display device. Background technique

Thin film transistor liquid crystal displays (TFT-LCDs) are dominant in flat panel display due to their small size, low power consumption, and no radiation. They are widely used in various fields.

A liquid crystal display device of the prior art generally includes an array substrate, a color filter substrate, and a liquid crystal filled between the two substrates. The array substrate may include gate lines, data lines, thin film transistors, and pixel electrodes. The color filter substrate may include a black matrix, a colored resin layer, and a transparent conductive layer. The electric field is applied to the liquid crystal molecules through the pixel electrode and the transparent conductive layer, thereby achieving deflection of the liquid crystal molecules.

The prior art prepares a liquid crystal display device by forming an array substrate on one sheet of glass and forming a color film substrate on another sheet of glass, and finally placing the two substrates on the cassette and injecting a liquid crystal therebetween. On the one hand, in the manufacturing process, the array substrate and the color film substrate are not flat, and there are step regions, so that there are many bad phenomena after the box is on the other hand; on the other hand, the process is improved to reduce the step region, to a certain extent. The thickness of the substrate is increased, which hinders the development of the liquid crystal display in the direction of thinning. Summary of the invention

The display device according to the embodiment of the present invention can eliminate the step region caused by the surface unevenness of the array substrate and the color filter substrate and does not increase the thickness of the liquid crystal display device.

Embodiments of the present invention provide an array substrate including a color film and an array formed on a substrate, the array being located above the color film.

In an embodiment, the color film may include a color resin layer formed on the base substrate, and a transparent layer formed over the color resin layer, the array may include a gate line, a thin film transistor, and a pixel electrode, and the groove may be disposed in the transparent layer At the surface, the gate of the thin film transistor can be located in the recess.

In an embodiment, the color film may further include a black matrix between the colored resin layers, and the grooves may be located above and opposite to the black matrix.

In an embodiment, the depth, width and length of the groove can be respectively related to the thickness, width and width of the gate The lengths are equal.

In an embodiment, the shape of the groove may be the same as the overall shape of the gate line and the gate, and the depth of the groove may be equal to the thickness of the gate line and the gate.

In an embodiment, the array may further comprise a common electrode, and the common electrode may be located below the pixel electrode.

In an embodiment, the common electrode may be located in another recess formed in the transparent layer and in the same horizontal plane as the gate.

In an embodiment, the array may further comprise a common electrode, and the common electrode may be located above the pixel electrode.

In an embodiment, at least the electrode located above the common electrode and the pixel electrode is a slit electrode. In an embodiment, the colored resin layer may include a red resin, a green resin, and a blue resin. In an embodiment, the transparent layer may utilize an acrylic material.

The present invention also provides a display device comprising the array substrate as described above.

In the array substrate provided by the above technical solution, by arranging the array on the color film and forming a groove in the transparent layer of the color film to set the gate and/or the gate line of the array in the groove, not only the array substrate but also the gate line can be disposed in the groove. The overall thickness of the liquid crystal display device is reduced to make it thinner and lighter; the flatness of the liquid crystal display device can also be increased, so that some display defects of the liquid crystal display device can be reduced. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present invention, and are not intended to limit the present invention. .

1 is a schematic structural view of a liquid crystal display device according to a first embodiment of the present invention;

2 is a schematic structural view of a lower substrate according to a first embodiment of the present invention;

3 is a schematic view of a lower substrate after forming a black matrix pattern according to a first embodiment of the present invention; FIG. 4 is a schematic view of the lower substrate after forming a colored resin pattern according to the first embodiment of the present invention;

5 is a schematic view of a lower substrate after forming a transparent layer according to a first embodiment of the present invention; FIG. 6 is a schematic view of a lower substrate after forming a gate pattern according to a first embodiment of the present invention; The lower substrate of an embodiment is formed with an active layer, a source, a drain, and a TFT. a schematic view of a channel region;

8 is a schematic view of a lower substrate after forming a passivation layer pattern according to a first embodiment of the present invention; FIG. 9 is a schematic view of a lower substrate after forming a pixel electrode pattern according to a first embodiment of the present invention;

Fig. 10 is a view showing the configuration of a liquid crystal display device according to a second embodiment of the present invention. detailed description

The technical solutions of the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings of the embodiments of the present invention. It is apparent that the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention.

First embodiment

1 is a schematic structural view of a liquid crystal display device according to a first embodiment, and FIG. 2 is a schematic structural view of a lower substrate of FIG. 1. The liquid crystal display device of this embodiment may include an upper substrate 16, a lower substrate 1, and a liquid crystal 18 filled between the two substrates. The lower substrate 1 may include a lower substrate (not shown), a color film formed on the lower substrate, and an array above the color film. The upper substrate 16 may include an upper substrate (not shown) and a common electrode 17 formed on the lower surface of the upper substrate.

Referring to FIGS. 1 and 2, the color film may include a black matrix 2 and a color resin layer formed on the upper surface of the lower substrate, and a transparent layer 6 formed on the black matrix 2 and the color resin layer, and the transparent layer 6 may be Made of acrylic material. As shown in FIG. 2, the array may include a gate line (not shown) formed over the transparent layer 6, a data line (not shown), a thin film transistor (TFT) 7 and a pixel electrode 15. An enlarged view of the TFT 7 of the array is shown in FIG. 9, wherein the TFT 7 may include a gate 8, a gate insulating layer 9, a semiconductor layer 10, a doped semiconductor layer 11, a source 12, a drain 13, and a passivation layer 14. . By integrally arranging the color film and the array (i.e., the color film and the array are disposed on the same substrate), the overall thickness of the liquid crystal display device can be reduced, and the liquid crystal display can be made thinner and lighter.

In order to avoid the problem that the array and the color film have a stepped area due to unevenness of the surface during the manufacturing process, in the embodiment, a groove is provided at the surface of the transparent layer 6, so that the gate 8 is located in the groove. And the depth and width of the groove may correspond to the thickness and width of the gate 8, respectively Equal, making the surface of the lower substrate flat. It should be noted that the transparent layer 6 described in this embodiment may not be provided with a groove, and the gate electrode 8 is directly formed on the transparent layer 6. The person skilled in the art can freely select and set according to actual needs. The color resin layer may include a red resin 3, a green resin 4, and a blue resin 5, and the black matrix 2 is located between two adjacent resins of the red resin 3, the green resin 4, and the blue resin 5. The groove may be disposed above and opposite the black matrix 2. Of course, the color resin layer may further include other color resins depending on design requirements, and embodiments of the present invention are not limited to the above colors.

In addition, the gate line may also be located in the recess, the shape of the recess may be the same as the overall shape of the gate line and the gate, and the depth of the recess may be equal to the thickness of the gate line and/or the gate.

The embodiment further provides a method for manufacturing the array substrate of the above liquid crystal display device, which specifically includes the following steps:

First, a color film is prepared.

Referring to Fig. 3, a lower substrate is provided, and a patterned black matrix 2 is formed on the lower substrate. Specifically, a black matrix material is deposited on the lower substrate, and the black matrix material may be made of a metal material or a resin material having better light shielding properties or other materials having better light shielding properties; and then arranged in an array by patterning the black matrix material. Black matrix 2. If the black matrix material is made of a metal material, the black matrix pattern can be formed by a glue coating, exposure, development, etching, and lift-off process; if the black matrix material is made of a resin material, black is formed by exposure, development, and baking treatment. Matrix graphics.

Referring to Fig. 4, a color resin pattern is deposited on the substrate shown in Fig. 3, and a color resin is distributed between the black matrixes 2. Specifically, a color resin material is deposited on the base substrate after forming the black matrix pattern, a color resin pattern is formed by exposure, development, and baking treatment, and a color resin pattern is distributed between the black matrixes 2. The color resin may include a red resin 3, a green resin 4, and a blue tree, or may further include a resin of another color such as a white resin or a yellow resin. In practical applications, resin patterns of various colors can be arranged in any order. In the present embodiment, the color resin including the red resin 3, the green resin 4, and the blue resin 5 will be described as an example.

Referring to Figure 5, a transparent layer 6 is deposited on the substrate shown in Figure 4. Specifically, a transparent layer 6 is deposited on a base substrate on which a colored resin pattern is formed to form a flat surface, and grooves are formed in the transparent layer 6 by exposure, development, and baking treatment. The depth and width of the grooves can be equal to the thickness and width of the gate, respectively. The depth and width of the formed groove can be controlled by adjusting the exposure amount. Transparent layer Then, an array was prepared on a color film.

Referring to FIG. 6, a gate metal layer is deposited on the substrate of the transparent layer pattern by magnetron sputtering, and the gate metal layer may be made of molybdenum, aluminum, aluminum-nickel alloy, molybdenum-tungsten alloy, chromium, or For metals such as copper, a combination of films of the above materials may also be used. A pattern including a gate electrode 8 and a gate line (not shown) is formed by a normal mask process in which the gate electrode 8 is located in the recess of the transparent layer 6, and forms a planarized surface together with the transparent layer 6.

Referring to Fig. 7, a gate insulating layer 9, a semiconductor layer 10, a doped semiconductor layer 11, and a source/drain electrode layer are sequentially deposited on a substrate on which a gate pattern is completed. The material of the gate insulating layer 9 may be silicon nitride, silicon oxide or silicon oxynitride. The source and drain electrode layers may be made of molybdenum, aluminum, aluminum-nickel alloy, molybdenum-tungsten alloy, chromium, or copper. A combination of the above several materials is used. A pattern including an active layer, a source 12, a drain 13, a data line (not shown), and a TFT channel (not shown) may be formed by a gray scale mask process.

The steps of forming the active layer, the source 12, the drain 13 and the TFT channel region by the gray scale mask process may be specifically as follows:

Plasma enhanced chemical vapor deposition on a substrate that completes the gate pattern

After the gate insulating layer 9, the semiconductor layer 10, and the doped semiconductor layer 11 are sequentially deposited by a (PECVD) method, the source/drain metal layer is deposited by magnetron sputtering, and after the photoresist is applied, the photoresist is exposed by a gray scale mask. The photoresist is formed into a completely removed region, a partially removed region, and a completely reserved region, wherein the photoresist completely reserved region corresponds to a region where the data line, the source 12 and the drain 13 are located, and the photoresist portion reserved region corresponds to the TFT The region where the channel region is located, the photoresist completely removed region corresponds to the region other than the above-mentioned pattern;

After the development process, the thickness of the photoresist in the completely remaining area of the photoresist is not changed, the photoresist in the remaining portion of the photoresist is thinned, and the photoresist in the completely removed region of the photoresist is completely removed;

刻蚀 etching away the source/drain metal layer in the completely removed region of the photoresist by a wet etching process, and etching the doped semiconductor layer 11 and the semiconductor layer 10 in the completely removed region of the photoresist by a dry etching process to perform the photoresist The ashing process completely removes the photoresist in the remaining portion of the photoresist, exposes the source and drain metal layers, and performs a second etching by an etching process to completely etch away the source and drain metal layers of the remaining portion of the photoresist. And doping the semiconductor layer, and etching away part of the semiconductor layer 10 to form a channel region of the TFT;

Finally, the remaining photoresist is stripped to complete the fabrication of the TFT.

Referring to FIG. 8, a substrate base in which an active layer, a source 12, a drain 13 and a TFT channel region are formed The passivation layer 14 is deposited on the upper surface by a plasma enhanced chemical vapor deposition method, and via holes are formed in the passivation layer by a common mask process, wherein the material of the passivation layer 14 can be oxidized by silicon nitride, silicon oxide or nitrogen. silicon.

Referring to FIG. 9, a transparent conductive layer is deposited on the base substrate on which the passivation layer 14 is formed. The transparent conductive layer may be made of indium tin oxide (ITO), indium oxide (IZO) or aluminum oxide (AZO). And other materials; the transparent conductive layer is patterned by a common mask process to form the pixel electrode 15, and the pixel electrode 15 may be directly connected to the drain 13 through a via hole in the passivation layer.

The specific preparation process of the upper substrate may include providing an upper substrate, depositing a transparent conductive layer on the upper substrate, and patterning the transparent conductive layer to form the common electrode 17.

Finally, the liquid crystal display device can be formed by relatively arranging the upper substrate and the lower substrate fabricated as described above, and injecting liquid crystal between the upper substrate and the lower substrate.

Second embodiment

Fig. 10 is a view showing the configuration of a liquid crystal display device according to a second embodiment, in which a partial enlarged view of the TFT 7 can be referred to Fig. 9. The structure of the liquid crystal display device according to the present embodiment is similar to that of the liquid crystal display device of the first embodiment, and the difference is that the array substrate in the first embodiment is set to the TN mode, and the array substrate in this embodiment. Set to ADS mode. Specifically, in this embodiment, the common electrode 17 and the pixel electrode 15 may be disposed on the lower substrate 1, the pixel electrode 15 may be located above the common electrode 17, the pixel electrode 15 may be in the shape of a slit, and the common electrode 17 may be connected to the gate. 8 is formed in the same layer, that is, the common electrode 17 is located in another recess formed in the transparent layer 6 and at the same level as the gate 8, in which case the common electrode 17 may be slit-like or planar. Alternatively, the common electrode 17 and the pixel electrode 15 may still be disposed on the lower substrate 1, but the common electrode 17 is disposed above the pixel electrode 15, at which time the common electrode 17 is disposed in a slit shape, and the common electrode 17 and the pixel electrode 15 are respectively Located above and below the passivation layer 14, the pixel electrode 15 may be slit or planar. The structure and formation method of the color film and other components of the array on the lower substrate 1 in this embodiment are the same as those of the first embodiment, and are not described herein again.

It can be seen from the above embodiment that the embodiment of the present invention can reduce the liquid crystal display device by disposing the array on the color film and forming a groove in the transparent layer of the color film to set the gate in the groove. The overall thickness is made thinner and lighter; on the other hand, the flatness of the liquid crystal display device can be increased, so that some display defects of the liquid crystal display can be reduced.

The above is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims.

Claims

claims

I. An array substrate, the array substrate includes a color filter and an array formed on the base substrate, the array is located above the color filter.

2. The array substrate of claim 1, wherein the color filter includes a color resin layer formed on the base substrate and a transparent layer formed on the color resin layer; the array includes gate lines, Thin film transistor and pixel electrode; a groove is provided on the surface of the transparent layer, and the gate electrode of the thin film transistor is located in the groove.

3. The array substrate of claim 2, wherein the color filter further includes a black matrix located between the color resin layers, and the groove is located above and opposite to the black matrix.

4. The array substrate according to any one of claims 2-3, wherein the depth, width and length of the groove are respectively equal to the thickness, width and length of the gate electrode.

5. The array substrate according to any one of claims 2 to 4, wherein the shape of the IHJ groove is the same as the overall shape of the gate line and the gate electrode, and the depth of the groove is the same as the overall shape of the gate line and the gate electrode. The thickness of the gate line and the gate electrode are equal.

6. The array substrate according to any one of claims 2 to 5, wherein the array further includes a common electrode, and the common electrode is located below the pixel electrode.

7. The array substrate of claim 6, wherein the common electrode is located in another groove formed in the transparent layer and at the same level as the gate electrode.

8. The array substrate according to any one of claims 2 to 5, wherein the array further includes a common electrode, the common electrode is located above the pixel electrode.

9. The array substrate according to any one of claims 6 to 8, wherein at least the upper electrode among the common electrode and the pixel electrode is a slit electrode.

10. The array substrate according to any one of claims 2 to 9, wherein the colored resin layer includes red resin, green resin and blue resin.

II. The array substrate according to any one of claims 2-10, wherein the transparent layer is made of acrylic material.

12. A display device, comprising the array substrate according to any one of claims 1-11.