TWI383225B - Liquid crystal display panel and method of fabricating the same - Google Patents

Description

Liquid crystal display panel and manufacturing method thereof

The present invention relates to a liquid crystal display panel, and more particularly to a liquid crystal display panel with a narrow margin design.

For the rapid advancement of the multimedia society, most of them benefit from the dramatic advancement of semiconductor components or human-machine display devices. In terms of displays, cathode ray tubes (CRTs) have always dominated the display market in recent years due to their excellent display quality and economy. However, for individuals who operate most terminal/display devices on the table, or from an environmental point of view, if there are still many problems in predicting the utilization of space and energy consumption of cathode ray tubes in terms of energy saving, The need for light, thin, short, small, and low power consumption does not provide an effective solution. Therefore, a liquid crystal display (LCD) with superior image quality, space utilization efficiency, low power consumption, and no radiation, will be replaced by the market.

1 is a partial cross-sectional view of a conventional liquid crystal display panel of a narrow margin design. As shown in FIG. 1 , the liquid crystal display panel 100 mainly includes an active device array substrate 110 , a color filter substrate 120 , a sealant 130 , and a liquid crystal layer 140 . The active device array substrate 110 has an electrode layer 112 thereon. The color filter substrate 120 is disposed under the active device array substrate 110 and includes a light shielding pattern layer 122, a plurality of color filter patterns 124, and a transparent electrode layer 126. Frame glue 130 is equipped The active device array substrate 110 and the color filter substrate 120 are disposed. The liquid crystal layer 140 is disposed in the closed space formed by the active device array substrate 110, the color filter substrate 120, and the sealant 130. Furthermore, in the liquid crystal display panel 100 of the current narrow-edge design, the sealant 130 is usually applied over the light-shielding pattern layer 122. In addition, the light-shielding pattern layer 122 uses a resin material instead of the conventional chromium (Cr) to meet environmental protection requirements.

After the fabrication of the liquid crystal display panel 100 is completed, the panel is usually subjected to a tensile test to test whether the bonding of the sealant is stable to prevent leakage of the liquid crystal layer 140. However, as a result of the tensile test, since the difference in material properties between the transparent electrode layer 126 and the light-shielding pattern layer 122 is too large, the sealant 130 and the transparent electrode layer 126 may be peeled due to poor adhesion.

In order to solve the above problem, in the liquid crystal display panel disclosed in the Patent No. I274932 of the Republic of China, a patterned groove is formed on the protective layer of the color filter substrate, thereby increasing the sealant and the color filter substrate. The contact area between the two prevents the peeling between the sealant and the color filter substrate. However, the step of forming a groove on the protective layer will increase the manufacturing cost of the liquid crystal display panel and increase the complexity of the process. In addition, in the patent of U.S. Patent No. 6,654,084, the patterning process of the electrode is used to directly bond the sealant to the light-shielding pattern layer, thereby increasing the adhesion between the two to prevent the sealant from being colored by the color filter substrate. Stripped on.

The object of the present invention is to provide a liquid crystal display panel and a maker thereof The method is suitable for liquid crystal display panels with narrow edge design. In this method, the transparent electrode layer formed on the light shielding pattern layer is removed by using a volatile auxiliary agent, so that the sealant can be directly attached to the light shielding pattern layer. Thus, in the conventional liquid crystal display panel, the case where the sealant and the transparent electrode layer are peeled off due to poor adhesion can be solved.

To achieve the above or other objects, the present invention provides a liquid crystal display panel comprising an active device array substrate, a color filter substrate, a sealant, and a liquid crystal layer. The color filter substrate is disposed relative to the active device array substrate, and includes a substrate, a light shielding pattern layer, a plurality of color filter patterns, and a transparent electrode layer. The substrate has a display area and a non-display area located at the periphery of the display area. The light shielding pattern layer is disposed on the substrate to define a plurality of sub-pixel regions on the display region of the substrate, and the light shielding pattern layer has a sealant coating region corresponding to the non-display region. A plurality of color filter patterns are respectively disposed in the corresponding sub-pixel regions. The transparent electrode layer is disposed on the light shielding pattern layer to cover the color filter pattern and expose the sealant coating region of the light shielding pattern layer. The sealant is disposed between the active device array substrate and the sealant coating region of the light shielding pattern layer. The liquid crystal layer is disposed between the active device array substrate, the color filter substrate, and the sealant.

In an embodiment of the invention, the liquid crystal display panel further includes a retaining wall disposed on the light shielding pattern layer to expose the sealant coating region. Wherein, the retaining wall and the color filter patterns are composed of the same film layer.

In an embodiment of the invention, the retaining wall defines a plurality of openings to expose the underlying light-shielding pattern layer.

In an embodiment of the invention, the retaining wall is disposed on the surface of the light shielding pattern layer On the surface.

In an embodiment of the invention, the retaining wall is disposed in the light shielding pattern layer.

To achieve the above or other objects, the present invention further provides a method of fabricating a liquid crystal display panel comprising the following steps. First, a color filter substrate is provided. The color filter substrate includes a substrate, a light shielding pattern layer and a plurality of color filter patterns. The substrate has a display area and a non-display area located at the periphery of the display area. The light shielding pattern layer is disposed on the substrate to define a plurality of sub-pixel regions on the display area of the substrate, and the light shielding pattern layer has a sealant coating area corresponding to the non-display area, and the color filter patterns are respectively configured In the corresponding sub-pixel area. Thereafter, a volatile auxiliary agent is formed on the sealant-coated region of the light-shielding pattern layer. Next, a first heating process is performed to cure the volatile adjuvant. Further, a transparent electrode layer is formed on the substrate to cover the light shielding pattern layer, the color filter pattern and the volatile auxiliary agent. A second heating process is performed to remove the volatile adjuvant and the transparent electrode layer thereabove. Thereafter, a sealant is formed on the sealant-coated region of the light-shielding pattern layer. In addition, an active device array substrate is provided. Then, the active device array substrate and the color filter substrate are bonded to maintain a gap between the active device array substrate and the color filter substrate by the sealant. Finally, a liquid crystal layer is formed between the active device array substrate and the color filter substrate, and the sealant surrounds the liquid crystal layer.

In one embodiment of the invention, the volatile adjuvant is a volatile polymer.

In one embodiment of the invention, the volatile adjuvant comprises polymethyl propyl Methyl enoate (PMMA), polyethyl methacrylate (PEMA), 1,3-dioxepane, α-polymethylstyrene, n-butyl-methacryl oxime N-butyl-methacrylamide, N-phenyl-methacrylamide or methyl siloxanes.

In one embodiment of the invention, the first heating process is to heat the volatile adjuvant to a curing temperature. Further, the curing temperature is between about 100 ° C and 120 ° C.

In one embodiment of the invention, the second heating process heats the volatile adjuvant to a volatilization temperature. Further, the volatilization temperature is between 200 ° C and 220 ° C.

In one embodiment of the present invention, the volatile auxiliary agent is formed on the sealant-coated region of the light-shielding pattern layer by inkjet or needle coating.

In an embodiment of the invention, the color filter substrate further includes a retaining wall disposed on the light shielding pattern layer to expose the sealant coating region, and the subsequently formed transparent electrode layer also covers the retaining wall. Furthermore, the retaining wall and the color filter patterns are made of the same film layer.

The liquid crystal display panel of the present invention and the manufacturing method thereof are designed for a liquid crystal display panel with a narrow margin. The manufacturing method mainly comprises first forming a volatile auxiliary agent on the sealant coating region of the light shielding pattern layer, and then forming a transparent electrode layer comprehensively on the substrate. Next, the volatile auxiliary agent is heated to a specific temperature range to remove the volatile auxiliary agent and the transparent electrode layer formed above the volatile auxiliary agent, so that the subsequently formed frame glue can be directly attached to the light shielding. On the pattern layer. This production method can solve the conventional knowledge In the liquid crystal display panel, the sealant and the transparent electrode layer are peeled off due to poor adhesion.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

2A-2H are schematic cross-sectional views showing a manufacturing process of a liquid crystal display panel according to an embodiment of the invention. The production process is mainly for a liquid crystal display panel (ie, a liquid crystal display panel with a narrow-edge design) in which a sealant is formed on a light-shielding pattern layer, thereby removing a transparent electrode layer formed over the light-shielding pattern layer by the manufacturing process. The sealant can be directly attached to the light-shielding pattern layer to prevent the peeling of the sealant and the transparent electrode layer due to poor adhesion in the prior art. The following describes the production process of this liquid crystal display panel with an illustration.

First, please refer to FIG. 2A to provide a color filter substrate 220. The color filter substrate 220 includes a substrate 221 , a light shielding pattern layer 222 , a plurality of color filter patterns 223 , and a retaining wall 224 . As shown in FIG. 2A, the substrate 221 has a display area D1 and a non-display area D2 located at the periphery of the display area D1. The light shielding pattern layer 222 (ie, the black matrix) is disposed on the substrate 221 to define a plurality of sub-pixel regions P on the display area D1 of the substrate 221. In addition, the liquid crystal display panel of the narrow-edge design has a sealant applied over the light-shielding pattern layer 222. Therefore, a sealant-coated region S is formed at the light-shielding pattern layer 222 corresponding to the non-display area D2. A plurality of color filter patterns 223 are respectively provided Placed in the corresponding sub-pixel area P. To simplify the illustration, only the primary pixel area P at the edge of the display area D1 is shown in this embodiment for illustration. The retaining wall 224 is disposed on the light shielding pattern layer 222 to expose the sealant coating region S of the light shielding pattern layer 222. In this embodiment, the retaining wall 224 and the color filter pattern 223 are composed of the same film layer, so that the fabrication of the retaining wall 224 can be completed without increasing the number of masks.

Thereafter, referring to FIG. 2B, a volatile auxiliary agent 225 is formed on the sealant-coated region S of the light-shielding pattern layer 222 (ie, the region surrounded by the retaining wall 224). The volatile auxiliary agent 225 is a volatile polymer characterized in that the volatile auxiliary agent 225 is solidified when it is heated to a curing temperature, and is volatile when heated to a volatilization temperature. The adjuvant 225 will volatilize. In one embodiment of the present invention, the material of the volatile auxiliary agent 225 may be polymethyl methacrylate (PMMA), polyethyl methacrylate (PEMA), or 1,3-dioxepane (1, 3-dioxepane), α-polymethylstyrene, N-butyl-methacrylamide, N-phenyl-methacrylamide or methyl A Materials such as methyl, methyl siloxanes. Further, the volatile auxiliary agent 225 may be formed on the sealant-coated region S of the light-shielding pattern layer 222 by means of inkjet or needle coating.

Next, referring to FIG. 2C, a first heating process is performed to cure the volatile auxiliary agent 225. In this embodiment, the volatile adjuvant 225 is heated to a curing temperature of about 100 ° C to 120 ° C to cure the volatile adjuvant 225. Then, as shown in FIG. 2D, a transparent electrode layer 226 is formed on the substrate 221 to cover the light shielding pattern layer. 222. The color filter pattern 223, the retaining wall 224, and the volatile auxiliary agent 225. In this embodiment, an indium tin oxide (ITO) is formed on the substrate 221 by sputtering to serve as the transparent electrode layer 226.

Next, referring to FIG. 2E, a second heating process is performed to remove the volatile auxiliary agent 225 and the transparent electrode layer 226 thereover. Thus, the sealant-coated region S on the light-shielding pattern layer 222 can be exposed. In this embodiment, the volatile auxiliary agent 225 is heated to a volatilization temperature of about 200 ° C to 220 ° C. At this time, the volatile auxiliary agent 225 is volatilized and the transparent electrode layer 226 above it is taken away. .

Then, as shown in FIG. 2F, a sealant 230 is formed on the sealant-coated region S of the light-shielding pattern layer 222, and an active device array substrate 210 is provided. Then, as shown in FIG. 2G, the active device array substrate 210 and the color filter substrate 220 are bonded to maintain a gap between the active device array substrate 210 and the color filter substrate 220 by the sealant 230. Finally, as shown in FIG. 2H, a liquid crystal layer 240 is formed between the active device array substrate 210 and the color filter substrate 220, and the sealant 230 surrounds the liquid crystal layer 240. Thus, the manufacturing process of the liquid crystal display panel 200 of the present invention is completed. In one embodiment, a method for forming a liquid crystal layer 240 between the active device array substrate 210 and the color filter substrate 220 is to use liquid crystal dropping technology (ODF), that is, to apply the sealant 230 on one of the substrates. Thereafter, the liquid crystal layer 240 is injected in such a manner that the liquid crystal is dropped, and then the other substrate is assembled into the liquid crystal display panel 200.

As shown in FIG. 2H, the liquid crystal display panel 200 of the present invention mainly includes an active device array substrate 210, a color filter substrate 220, and a frame glue. 230 and a liquid crystal layer 240. The color filter substrate 220 is disposed relative to the active device array substrate 210 and includes a substrate 221 , a light shielding pattern layer 222 , a plurality of color filter patterns 223 , a retaining wall 224 , and a transparent electrode layer 226 . The substrate 221 has a display area D1 and a non-display area D2 located at the periphery of the display area D1. The light-shielding pattern layer 222 is disposed on the substrate 221 to define a plurality of sub-pixel regions P on the display region D1 of the substrate 221, and the light-shielding pattern layer 222 has a sealant-coated region S corresponding to the non-display region D2.

The plurality of color filter patterns 223 are respectively disposed in the corresponding sub-pixel regions P. The retaining wall 224 is disposed on the light shielding pattern layer 223 to expose the sealant coating region S. The transparent electrode layer 226 is disposed on the light-shielding pattern layer 222 to cover the color filter pattern 223 and the retaining wall 224, and also exposes the sealant-coated region S of the light-shielding pattern layer 222. The sealant 230 is disposed between the active device array substrate 210 and the sealant coating region S of the light shielding pattern layer 222 on the color filter substrate 220. Finally, the liquid crystal layer 240 is disposed between the active device array substrate 210, the color filter substrate 220, and the sealant 230.

In the above embodiment, a retaining wall 224 is formed on the light-shielding pattern layer 222, so that the volatile auxiliary agent 225 can be formed on the sealant-coated region S exposed by the retaining wall 224. However, it is not necessary to form the retaining wall 224 on the light-shielding pattern layer 222, and the volatile auxiliary agent 225 is directly applied to the sealant-coated region S, and the same effect can be achieved. The present invention does not impose any restrictions on the setting of the retaining wall 224.

The transparent electrode layer 226 of the sealant coating area S of the non-display area D2 is removed, so that the plastic frame 230 can directly contact the light shielding pattern layer 222. In order to solve the problem that the sealant and the transparent electrode layer are peeled off due to poor adhesion. The retaining wall 224 in the sealant coating area S on the light-shielding pattern layer 222 can have various designs. For example, the retaining wall 224 is formed in a groove pattern to expose the underlying light-shielding pattern layer 222 so that The sealant 230 can be filled into the groove.

In addition, the retaining wall in the sealant coating area may also constitute a plurality of opening patterns, and the underlying light shielding pattern layer is exposed, which is described in detail below. Please refer to FIG. 3A and FIG. 3B. FIG. 3A is a top view corresponding to the step of FIG. 2E. Fig. 3B is a schematic cross-sectional view taken along line I-I' of Fig. 3A. After removing the volatile auxiliary agent and the transparent electrode layer thereon to expose the sealant coating region S on the light shielding pattern layer 222, the retaining wall 224 constitutes a plurality of openings 224a, and the opening 224a exposes the underlying light shielding pattern Layer 222.

Further, in another embodiment, as shown in Fig. 4, it is a schematic cross-sectional view along line I-I' of Fig. 3A. 4 is similar to the structure of FIG. 3B except that the retaining wall 224 is embedded in the light shielding pattern layer 222. Similarly, however, the retaining wall 224 will define a plurality of openings 224a, and the opening 224a exposes the underlying light-shielding pattern layer 222.

In summary, the liquid crystal display panel of the present invention and the manufacturing method thereof are mainly applicable to a liquid crystal display panel with a narrow margin design. In this manner, a volatile auxiliary agent is formed on the sealant coating region of the light shielding pattern layer, and a transparent electrode layer is formed on the substrate. Thereafter, the volatile auxiliary agent and the transparent electrode layer thereabove are removed by heating the volatile auxiliary agent to a specific temperature range, so that the sealant can be directly attached to the light-shielding pattern layer. Thus, in the conventional liquid crystal display panel, the sealant and the transparent electrode layer are attached. The situation in which the force is not good and the peeling occurs, thereby improving the reliability of the liquid crystal display panel.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100,200‧‧‧LCD panel

110, 210‧‧‧Active component array substrate

112‧‧‧electrode layer

120, 220‧‧‧ color filter substrate

122, 222‧‧‧ shading pattern layer

124, 223‧‧‧ color filter pattern

126, 226‧‧ ‧ transparent electrode layer

130‧‧‧Box glue

140, 240‧‧‧ liquid crystal layer

221‧‧‧Substrate

224‧‧ ‧ retaining wall

224a‧‧‧ openings

225‧‧‧Volatile adjuvant

D1‧‧‧ display area

D2‧‧‧ non-display area

P‧‧‧ pixel area

S‧‧‧Binder coating area

1 is a partial cross-sectional view of a conventional liquid crystal display panel of a narrow margin design.

2A-2H are schematic cross-sectional views showing a manufacturing process of a liquid crystal display panel according to an embodiment of the invention.

3A is a top view of the steps corresponding to FIG. 2E, in accordance with another embodiment of the present invention.

Fig. 3B is a schematic cross-sectional view taken along line I-I' of Fig. 3A.

Figure 4 is a cross-sectional view along line I-I' of Figure 3A, in accordance with another embodiment of the present invention.

200‧‧‧LCD panel

210‧‧‧Active component array substrate

220‧‧‧Color filter substrate

221‧‧‧Substrate

222‧‧‧Lighting pattern layer

223‧‧‧Color filter pattern

224‧‧ ‧ retaining wall

226‧‧‧Transparent electrode layer

230‧‧‧Box glue

240‧‧‧Liquid layer

D1‧‧‧ display area

D2‧‧‧ non-display area

P‧‧‧ pixel area

S‧‧‧Binder coating area

Claims (15)

A liquid crystal display panel includes: an active device array substrate; a color filter substrate disposed relative to the active device array substrate, the color filter substrate comprising: a substrate having a display area and a periphery of the display area a non-display area; a light-shielding pattern layer disposed on the substrate to define a plurality of sub-pixel regions on the display area of the substrate, and the light-shielding pattern layer has a frame glue coating corresponding to the non-display area a plurality of color filter patterns respectively disposed in the corresponding sub-pixel regions; and a transparent electrode layer disposed on the light-shielding pattern layer to cover the color filter patterns and exposing the a masking coating region of the light shielding pattern layer; a frame glue disposed between the active device array substrate and the sealant coating region of the light shielding pattern layer; and a liquid crystal layer disposed on the active device array substrate, Between the color filter substrate and the sealant. The liquid crystal display panel of claim 1, further comprising a retaining wall disposed on the light shielding pattern layer to expose the sealant coating area, wherein the retaining wall and the color filter patterns are It consists of the same film layer. The liquid crystal display panel of claim 2, wherein the retaining wall constitutes a plurality of openings to expose the underlying light shielding pattern layer. The liquid crystal display panel of claim 2, wherein the retaining wall is disposed on a surface of the light shielding pattern layer. The liquid crystal display panel of claim 2, wherein the retaining wall is disposed in the light shielding pattern layer. A method for fabricating a liquid crystal display panel, comprising: providing a color filter substrate, wherein the color filter substrate comprises a substrate, a light shielding pattern layer and a plurality of color filter patterns, the substrate having a display area and a display a non-display area on the periphery of the area, the light-shielding pattern layer is disposed on the substrate, and a plurality of sub-pixel areas are defined on the display area of the substrate, and the light-shielding pattern layer has a frame glue coating corresponding to the non-display area And the color filter patterns are respectively disposed in the corresponding sub-pixel regions; a volatile auxiliary agent is formed on the sealant coating region of the light-shielding pattern layer; and a first heating process is performed, Curing the volatile auxiliary agent; forming a transparent electrode layer on the substrate to cover the light shielding pattern layer, the color filter patterns and the volatile auxiliary agent; performing a second heating process to remove the volatile a auxiliary agent and the transparent electrode layer thereon; forming a sealant on the sealant coating region of the light shielding pattern layer; providing an active device array substrate; bonding the active device array substrate and A color filter substrate, so that the active element array substrate and the color filter substrate by the sealant while maintaining a gap; and A liquid crystal layer is formed between the active device array substrate and the color filter substrate, and the sealant surrounds the liquid crystal layer. The method for fabricating a liquid crystal display panel according to claim 6, wherein the volatile auxiliary agent is a volatile polymer. The method for fabricating a liquid crystal display panel according to claim 7, wherein the volatile polymer comprises polymethyl methacrylate (PMMA), polyethyl methacrylate (PEMA), 1,3- 1,3-dioxepane, α-polymethylstyrene, n-butyl-methacrylamide, n-phenyl-methacrylamide (N- Phenyl-methacrylamide or methyl siloxanes. The method of fabricating a liquid crystal display panel according to claim 6, wherein the first heating process is to heat the volatile auxiliary agent to a curing temperature. The method for fabricating a liquid crystal display panel according to claim 9, wherein the curing temperature is between 100 ° C and 120 ° C. The method for fabricating a liquid crystal display panel according to claim 6, wherein the second heating process is to heat the volatile auxiliary agent to a volatilization temperature. The method for fabricating a liquid crystal display panel according to claim 11, wherein the volatilization temperature is between 200 ° C and 220 ° C. The method for fabricating a liquid crystal display panel according to claim 6, wherein the volatile auxiliary agent is formed on the sealant-coated region of the light-shielding pattern layer by inkjet or needle coating. The method for fabricating a liquid crystal display panel according to claim 6, wherein the color filter substrate further comprises a retaining wall disposed on the light shielding pattern layer to expose the sealant coating region and subsequently formed The transparent electrode layer also covers the retaining wall. The method for fabricating a liquid crystal display panel according to claim 14, wherein the retaining wall and the color filter patterns are made of the same film layer.