CN101539678A - Liquid crystal display panel and manufacturing method thereof - Google Patents

Abstract

The invention discloses a manufacturing method of a liquid crystal display panel, which comprises the following steps: first, a first substrate and a second substrate are provided. Then, a mixed solution is formed between the first substrate and the second substrate, wherein the mixed solution is composed of a plurality of liquid crystal molecules and a plurality of polymer monomers. Then, an electric field is formed between the first substrate and the second substrate. Further, the local mixed solution is subjected to a first light irradiation step to polymerize a part of the high molecular monomer. And finally, carrying out a second light irradiation step on the mixed solution to polymerize the high molecular monomer.

Description

Liquid crystal display panel and manufacturing method thereof

technical field

The present invention relates to a liquid crystal display panel and a manufacturing method thereof, and in particular to a liquid crystal display panel capable of reducing dark lines and improving display quality and a manufacturing method thereof.

Background technique

The multimedia technology in today's society is quite developed, mostly benefiting from the progress of semiconductor components and display devices. As far as displays are concerned, liquid crystal display panels 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. Generally speaking, a liquid crystal display panel is mainly composed of an active element array substrate, a color filter substrate and a liquid crystal layer between the two substrates.

In order to improve the manufacturing quality of liquid crystal display panels, PSA (Polymer Sustain Alignment) technology will be used when forming a liquid crystal layer between the active element array substrate and the color filter substrate, as shown in Figures 1A to 1C: A liquid crystal layer 13 is formed between the element array substrate 11 and the color filter substrate 12 , wherein the liquid crystal layer 13 is formed by mixing liquid crystal molecules 14 and polymer monomers 15 . Next, referring to FIG. 1B , a voltage V is applied between the active device array substrate 11 and the color filter substrate 12 to form an electric field. The liquid crystal molecules 14 are affected by the electric field, so they are in a tilted state. Then, the polymer monomer 15 in the liquid crystal layer 13 is irradiated with ultraviolet light U, so that the polymer monomer 15 is polymerized and the pretilt state of the liquid crystal molecules 14 is positioned.

Next, please refer to FIG. 1C , after the polymer monomer 15 is polymerized by ultraviolet light U, a lower polymer film layer 16 is formed on the pixel electrode E and an upper polymer film layer 17 is formed on the color filter substrate 12 . Generally speaking, in order to arrange the liquid crystal molecules 14 in multiple directions, a plurality of slits S' (slits) are formed on the pixel electrode E, so that the liquid crystal molecules 14 can have different alignments, so that the liquid crystal display panel can achieve a wide range. perspective requirements. It should be noted that the arrangement of the liquid crystal molecules 14 corresponding to the positions between the two different tilting directions (point A shown in FIG. 1C ) will be disordered. It is easy to cause dark stripes on the display screen, which leads to a decrease in the display quality of the liquid crystal display panel 10 , and there is a need for improvement.

Contents of the invention

The invention provides a manufacturing method of a liquid crystal display panel, which can make the liquid crystal molecules have a good arrangement state, so as to effectively avoid dark lines on the display screen.

The invention provides a liquid crystal display panel with good display quality.

The invention proposes a manufacturing method of a liquid crystal display panel including the following steps: firstly, a first substrate and a second substrate are provided. Then, a mixed solution is formed between the first substrate and the second substrate, wherein the mixed solution is composed of a plurality of liquid crystal molecules and a plurality of polymer monomers. Then, an electric field is formed between the first substrate and the second substrate, and a first light irradiation step is performed on the part of the mixed solution through the first substrate, so as to polymerize part of the polymer monomer. Afterwards, a second light irradiation step is performed on the mixed solution through the second substrate, so as to polymerize the polymer monomers not subjected to the first light irradiation step.

In an embodiment of the present invention, the above-mentioned first substrate includes an active element array substrate having a color filter layer.

In an embodiment of the present invention, the above-mentioned manufacturing method of the liquid crystal display panel further includes disposing a light-shielding object on the first substrate, and the first light irradiation step partially irradiates the mixed solution through the shielding of the light-shielding object.

In an embodiment of the present invention, the material of the above-mentioned light-shielding object includes metal.

In an embodiment of the present invention, the above-mentioned second substrate includes a light-transmitting substrate and a common electrode. Wherein, the common electrode is configured on the transparent substrate.

In an embodiment of the present invention, the above-mentioned first substrate includes an active element array substrate.

In an embodiment of the present invention, the above-mentioned second substrate includes a color filter substrate.

In an embodiment of the present invention, the above-mentioned first light irradiation step includes irradiating the polymer monomer with ultraviolet light.

In an embodiment of the present invention, the second light irradiation step includes irradiating the polymer monomer with ultraviolet light.

The invention provides a liquid crystal display panel, which includes an active element array substrate, a pair of opposite substrates and a liquid crystal layer. Wherein, the active element array substrate includes a substrate and a plurality of pixel units arranged on the substrate. Each pixel unit at least includes an active element, a color filter pattern layer, a light-shielding object, a pixel electrode and a first polymer film layer. The active element is arranged on the substrate, and the color filter pattern layer covers the active element and part of the substrate. In addition, the light-shielding object is disposed between the color filter pattern layer and the substrate. In addition, the pixel electrode covers the color filter pattern layer and is electrically connected with the active element. The above-mentioned first polymer film layer is disposed on the pixel electrode. The opposite substrate includes a transparent substrate, a common electrode and a second polymer film layer. Wherein, the common electrode is arranged on the transparent substrate, and the second polymer film layer is arranged on the common electrode. The above-mentioned liquid crystal layer is disposed between the active element array substrate and the opposite substrate.

In an embodiment of the present invention, the aforementioned pixel electrode has a plurality of slits.

In an embodiment of the present invention, the material of the above-mentioned light-shielding object includes metal.

The manufacturing method of the liquid crystal display panel of the present invention can use the light-shielding object to pass through the first substrate to perform the first light irradiation step on the partial polymer monomer, so that the pre-tilt state of part of the liquid crystal molecules can be positioned. Then, the second light irradiation step is performed on the mixed solution through the second substrate, so that the liquid crystal molecules located at the junction of the two different pouring directions can be kept perpendicular to the first substrate, so as to avoid dark lines on the liquid crystal display panel and Penetration rate can be improved. Therefore, the liquid crystal display panel of the present invention can have good display quality.

Description of drawings

In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

1A-1C are schematic cross-sectional views of the manufacturing process of a conventional liquid crystal display panel.

2A-2E are schematic cross-sectional flow charts of the manufacturing method of the liquid crystal display panel according to the first embodiment of the present invention.

3A is a schematic partial cross-sectional view of a liquid crystal display panel according to a second embodiment of the present invention.

3B is a schematic partial cross-sectional view of a liquid crystal display panel according to a second embodiment of the present invention.

Description of main component symbols:

10, 100, 100’, 100”: LCD panel

11, 110': active element array substrate

12: Color filter substrate

13, 130, 130': liquid crystal layer

14, 132: liquid crystal molecules

15, 134: polymer monomer

16: lower polymer film layer

17: Upper polymer film layer

110: first substrate

112: Substrate

113: pixel unit

114: Active components

116: Color filter layer

118: pixel electrode

119, 125: polymer film

120: second substrate

120': opposite substrate

122: Transparent substrate

124: common electrode

C1: channel layer

C2: Ohmic contact layer

D: Drain

E: Pixel electrode

G: grid

GI: gate insulating layer

M: shade

S: source

P1: first polymer film layer

P2: Second polymer film layer

PA: protective layer

S': slit

U: Ultraviolet light

Detailed ways

first embodiment

2A-2E are schematic cross-sectional flow charts of the manufacturing method of the liquid crystal display panel according to the first embodiment of the present invention. Please refer to FIG. 2A first. The manufacturing method of the liquid crystal display panel of the present invention includes the following steps: First, a first substrate 110 and a second substrate 120 are provided. In one embodiment, the first substrate 110 may be an active element array substrate (Color filter on array, COA) with a color filter layer, and the second substrate 120 includes a light-transmitting substrate 122 and a light-transmitting The common electrode 124 on the substrate 122 . Certainly, those skilled in the art should know that the first substrate 110 of the present invention is not necessarily a substrate using the COA technology, but a general active element array substrate can be selectively used. In this case, the second substrate 120 is a color filter substrate.

In detail, the first substrate 110 is mainly composed of a substrate 112 , an active element (will be described in detail in the second embodiment), a color filter layer 116 and a pixel electrode 118 . Wherein, the color filter layer 116 is disposed on the substrate 112 , and the pixel electrode 118 is disposed on the color filter layer 116 . It can be seen from FIG. 2A that the pixel electrode 118 may have a plurality of slits S'. It should be noted that, in the present invention, a light-shielding object M may be formed on the first substrate 110 . The light-shielding object M can be disposed between the substrate 112 and the color filter layer 116 . Specifically, the material of the light-shielding object M may include metal, and is formed together with scan lines or data lines, for example, without additional process. Next, a mixed solution 130 is formed between the first substrate 110 and the second substrate 120 , wherein the mixed solution 130 is composed of a plurality of liquid crystal molecules 132 and a plurality of polymer monomers 134 (monomers).

2B, a voltage V is applied between the first substrate 110 and the second substrate 120 to form an electric field, and the first light irradiation step is performed on the local mixed solution 130 through the first substrate 110, so that Part of the polymer monomer 134 is polymerized. The first light irradiation step includes irradiating the polymer monomer 134 with ultraviolet light U. It should be noted here that the shade M located between the two slits S' can shield part of the ultraviolet light U, so that the polymer monomer 134 corresponding to the two slits S' is not irradiated by the ultraviolet light U . Of course, those skilled in the art may use other methods to shield the ultraviolet light depending on the actual situation. The above-mentioned light-shielding by the light-shielding object M of the first substrate 110 is only for illustration and not intentionally limited.

Then please refer to FIG. 2C , part of the polymer monomer 132 is polymerized after being irradiated by ultraviolet light U, and a polymer film 119 , 125 is formed on the pixel electrode 118 and the common electrode 124 respectively. At this time, the pre-tilt state of some liquid crystal molecules 132 will be aligned and tilted in different directions. It should be emphasized here that the polymer monomer 132 above the light-shielding object M is not irradiated by the ultraviolet light U, so the polymer film 119 corresponding to the pixel electrode 118 and the common electrode 124 above the light-shielding object M has not yet been formed.

Referring to FIG. 2D , a second light irradiation step is performed on the mixed solution 130 through the second substrate 120 to polymerize the polymer monomer 134 (shown at B) that has not been subjected to the first light irradiation step. The above-mentioned second light irradiation step is similar to the first light irradiation step, in which the ultraviolet light U is used to irradiate the polymer monomer 134 . In this way, after the polymer monomer 134 at B is polymerized, a first polymer film layer P1 (as shown in FIG. 2E ) will be formed on the pixel electrode 118 and a second polymer film layer will be formed on the common electrode 124. Film layer P2.

It is worth noting that the pretilt state of the liquid crystal molecules 132 located at the junction of two different tilting directions (as shown at B) will be aligned, and the liquid crystal molecules 132 will be perpendicular to the first substrate 110 and have a good alignment state. Therefore, the liquid crystal display panel 100 of the present invention can effectively avoid dark lines on the display screen and increase the transmittance, thereby improving the display quality of the display screen.

second embodiment

The second embodiment is a liquid crystal display panel formed by the method of manufacturing an active element array substrate COA with a color filter layer. 3A is a schematic partial cross-sectional view of a liquid crystal display panel according to a second embodiment of the present invention. Please refer to FIG. 3A , the liquid crystal display panel 100' of the present invention includes an active element array substrate 110', a counter substrate 120' and a liquid crystal layer 130'. Wherein, the liquid crystal layer 130' is disposed between the active element array substrate 110' and the opposite substrate 120'. Specifically, the active device array substrate 110' is mainly composed of a substrate 112 and pixel units 113 disposed on the substrate 112.

In addition, the pixel unit 113 at least includes an active element 114 , a color filter pattern layer 116 , a light-shielding object M, a pixel electrode 118 and a first polymer film layer P1 . Wherein, the active element 114 is disposed on the substrate 112 , and the color filter pattern layer 116 covers the active element 114 . It should be noted here that the active element 114 shown in FIG. 3A has a bottom gate (bottom gate) structure. Of course, the active element 114 can also use a top gate (top gate) structure, which is not deliberately limited here. . Specifically, the active device 114 includes a gate G, a gate insulating layer GI, a source S, a drain D, a channel layer C1 and an ohmic contact layer C2. Wherein, the gate G is disposed on the substrate 112 , and the gate insulating layer GI covers the gate G and part of the substrate 112 . In addition, the channel layer C1 is disposed on the gate insulating layer GI above the gate G, and the ohmic contact layer C2 is disposed between the source S and the channel layer C1 and between the drain D and the channel layer C1. The active element 114 is covered by a protection layer PA, and the color filter pattern layer 116 is formed on the protection layer PA.

It should be noted that the light-shielding object M is disposed between the color filter pattern layer 116 and the substrate 112 . The material of the light-shielding object M includes metal, which can be formed together with the gate G, for example. In one embodiment, the light-shielding object M may be formed together with the source S/drain D. As shown in FIG. 3B , the light-shielding object M is located between the gate insulating layer GI and the passivation layer PA. Certainly, those skilled in the art may choose to form the light-shielding object M and the source S/drain D together depending on the actual situation, and there is no intentional limitation here.

In addition, the pixel electrode 118 is disposed on the color filter pattern layer 116 and is electrically connected to the active element 114 . It can be seen from FIG. 3A that the pixel electrode 118 has a plurality of slits S'. In addition, the first polymer film layer P1 of the present invention is disposed on the pixel electrode 118 . On the other hand, the opposite substrate 120' of the present invention includes a transparent substrate 122, a common electrode 124 and a second polymer film layer P2. Wherein, the common electrode 124 is disposed on the transparent substrate 122 , and the second polymer film layer P2 is disposed on the common electrode 124 .

To sum up, the manufacturing method of the liquid crystal display panel of the present invention can use the light-shielding object to firstly perform the first light irradiation step on the local polymer monomer in the mixed solution through the first substrate, so that part of the liquid crystal molecules The pretilt state is positioned. Then, the second light irradiation step is performed on the mixed solution through the second substrate, so that the liquid crystal molecules located at the junction of two different pouring directions can be kept perpendicular to the first substrate, so as to avoid dark lines on the liquid crystal display panel and Improve penetration. Therefore, the liquid crystal display panel of the present invention can have good display quality. In addition, the light-shielding member of the present invention can be formed together with the gate electrode or the source/drain electrode, so no additional process is required.

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 present invention The scope of protection should be defined by the claims.

Claims (12)

1. A method for manufacturing a liquid crystal display panel, comprising: providing a first substrate and a second substrate; forming a mixed solution between the first substrate and the second substrate, wherein the mixed solution is composed of a plurality of liquid crystal molecules and a plurality of polymer monomers; forming an electric field between the first substrate and the second substrate, and performing a first light irradiation step to part of the mixed solution through the first substrate, so as to polymerize part of the polymer monomer; and A second light irradiation step is performed on the mixed solution through the second substrate, so as to polymerize the polymer monomers not subjected to the first light irradiation step. 2. The manufacturing method of a liquid crystal display panel as claimed in claim 1, wherein the first substrate comprises an active element array substrate having a color filter layer. 3. The manufacturing method of a liquid crystal display panel as claimed in claim 2, further comprising disposing a light-shielding object on the first substrate, and the first light irradiation step is shielded by the light-shielding object The mixed solution is subjected to partial irradiation. 4. The method of manufacturing a liquid crystal display panel as claimed in claim 3, wherein the material of the light-shielding object comprises metal. 5. The manufacturing method of a liquid crystal display panel as claimed in claim 1, wherein the second substrate comprises: a light-transmitting substrate; and A common electrode is arranged on the transparent substrate. 6. The manufacturing method of a liquid crystal display panel as claimed in claim 1, wherein the first substrate comprises an active element array substrate. 7. The manufacturing method of a liquid crystal display panel as claimed in claim 6, wherein the second substrate comprises a color filter substrate. 8. The manufacturing method of a liquid crystal display panel as claimed in claim 1, wherein the first light irradiation step comprises irradiating the polymer monomer with ultraviolet light. 9. The manufacturing method of a liquid crystal display panel as claimed in claim 1, wherein the second light irradiation step comprises irradiating the polymer monomer with ultraviolet light. 10. A liquid crystal display panel, comprising: An active element array substrate, including: a substrate; A plurality of pixel units are arranged on the substrate, and each pixel unit at least includes: an active element configured on the substrate; A color filter pattern layer covering the active element and part of the substrate; a light-shielding object disposed between the color filter pattern layer and the substrate; a pixel electrode covering the color filter pattern layer and electrically connected with the active element; and a first polymer film layer configured on the pixel electrode; A pair of substrates, including: a light-transmitting substrate; and a common electrode configured on the transparent substrate; a second polymer film layer disposed on the common electrode; A liquid crystal layer is disposed between the active element array substrate and the opposite substrate. 11. The liquid crystal display panel as claimed in claim 10, wherein the pixel electrode has a plurality of slits. 12. The liquid crystal display panel as claimed in claim 10, wherein the material of the light-shielding object comprises metal.

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