CN1282895C - Thin Film Transistor Liquid Crystal Display Panel - Google Patents

Abstract

A thin film transistor liquid crystal display panel comprises an upper substrate, a lower substrate and frame glue. The upper substrate has a glue area disposed along a side of the upper substrate and a display area adjacent to the glue area. The lower substrate is opposite to the upper substrate, the lower substrate is provided with a first covering layer, a second covering layer covers the first covering layer, the second covering layer corresponding to the gluing area is provided with an opening, part of the first covering layer can be exposed by the opening, and the opening is communicated with the side edge or the display area. And the frame glue is coated between the gluing area and the lower substrate. The frame glue is contacted with the second covering layer and the first covering layer through the opening, so that the lower substrate is bonded with the upper substrate. The panel has high strength, and can bear impact external force or vibration external force caused by negligence in use, thereby improving the display quality of the panel.

Description

Thin Film Transistor Liquid Crystal Display Panel

technical field

The present invention relates to a flat display panel, and more particularly to a liquid crystal display panel.

Background technique

On the thin film transistor substrate of the reflective and transflective thin film transistor liquid crystal display panels, there is usually a protective layer for protecting the transistor elements, and a photoresist layer is covered on the protective layer. The main purpose of the photoresist layer is to form some uneven surface, and then the metal layer is covered on the photoresist layer, causing the angle redistribution of the reflected light. In addition, another purpose of the photoresist layer is to extend the protective layer from the display area to the glued area to carry the frame spacer, so that the thickness of the interlayer near the side of the panel will not be uneven phenomenon occurs.

Please refer to FIG. 1A , FIG. 1B and FIG. 1C at the same time. FIG. 1A is a schematic diagram of a conventional thin film transistor liquid crystal display panel, FIG. 1B is a cross-sectional view along 1B-1B in FIG. 1A , and FIG. 1C is a cross-sectional view along 1C-1C in FIG. 1A. The TFT LCD panel 100 includes an upper substrate such as a color filter (color filter, CF) substrate 110 , and a lower substrate such as a thin film transistor (thin filmtransistor, TFT) substrate 120 .

The CF substrate 110 has a display area 130 and a glue area 140 . The TFT substrate 120 has a cover layer such as a passivation layer 122 , and a cover layer such as a photoresist layer 124 covering the passivation layer 122 . The sealant 112 is coated between the glued area 140 and the TFT substrate 120 . The protective layer 122 mentioned above can be made of silicon nitride or silicon dioxide, and the photoresist layer 124 can be made of organic materials.

Because the adhesion between the photoresist layer 124 and the protective layer 122 is poor, if the sealant 112 is directly bonded to the photoresist layer 124 to make the TFT substrate 120 and the CF substrate 110 bonded, the combined After the panel 100 is often subjected to an impact external force or vibration external force (reliability test is performed on the panel 100), the bonding interface between the photoresist layer 124 and the protective layer 122 is broken, so that the panel 100 is damaged, thereby affecting the panel 100. 100 display quality.

In response, the photoresist layer 124 of the TFT substrate 120 corresponding to the bonding area 140 has some openings 1240 , and these openings 1240 can expose a part of the protective layer 122 . The sealant 112 is in contact with the photoresist layer 124 above the TFT substrate 120 . Moreover, the sealant 112 is in contact with the protective layer 122 through the openings 1240 scattered on the photoresist layer 124 . Then, the CF substrate 110 and the TFT substrate 120 are pressed together by a jig, and then the entire panel 100 is baked in an oven (it can also be baked while pressurizing) to harden the sealant 112, thereby The TFT substrate 120 is bonded to the CF substrate 110 . The above-mentioned openings 1240 may be uniformly or emphatically disposed on the photoresist layer 124 where the sealant 112 is located in the gluing area 140 .

Because the adhesiveness between the sealant 112 and the protective layer 122 is better than the adhesiveness between the photoresist layer 124 and the protective layer 122, the sealant 112 is formed through the opening 1240 provided on the photoresist layer 124. In addition to adhering the photoresist layer 124 , a part of the protection layer 122 can also be adhering. This will make the panel 100 have greater strength.

The above-mentioned opening 1240 in the photoresist layer 124 allows the sealant 112 to be bonded to the protection layer 122 . However, since the sealant 112 is a colloid with a large viscosity coefficient, bubbles 1242 are often found in the opening 1240 filled in the sealant 112 after the CF substrate 110 and the TFT substrate 120 are combined ( FIG. 1B ). This will lead to insufficient bonding strength between the CF substrate 110 and the TFT substrate 120, and when the panel 100 is subjected to an external force, it will be broken by the bonding interface between the sealant 112 and the protective layer 122, which will also damage the panel 100, seriously It affects the display quality of the panel 100 .

To sum up, the disadvantages of the existing liquid crystal display panels are: the strength of the panels is insufficient. That is, the presence of air bubbles in the openings makes it very easy for the panel to generate cracks at the contact interface between the sealant and the protective layer when the panel is subjected to a large external force, thereby affecting the display quality of the panel.

Contents of the invention

In view of this, the object of the present invention is to provide a thin film transistor liquid crystal display panel. This type of panel has a relatively high strength, so that the panel can withstand external impact force or external vibration force caused by negligent use, and it is not easy to produce damage cracks between the CF substrate and the TFT substrate, thereby affecting the display quality of the panel.

According to the above purpose, the present invention provides a thin film transistor liquid crystal display panel, which mainly includes an upper substrate, a lower substrate and a sealant. The upper substrate has a glued area arranged along a side of the upper substrate and a display area adjacent to the glued area. The lower substrate is opposite to the upper substrate, the lower substrate has a first covering layer, the first covering layer is covered with a second covering layer, the second covering layer corresponding to the glued area has an opening, and the opening can expose part of the first covering layer layer, and the opening communicates with the side or (and) the display area. The frame glue is coated between the glued area and the lower substrate. The frame glue is in contact with the second covering layer, and the frame glue is in contact with the first covering layer through the opening, so that the lower substrate and the upper substrate are bonded together. In terms of structure, the first cover layer can be a protective layer made of silicon nitride or silicon dioxide, and the second cover layer can be a photoresist layer made of organic materials; the upper substrate can be a color filter The light sheet substrate, and the lower substrate may be a thin film transistor substrate.

In order to make the above-mentioned objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1A is a schematic diagram of an existing thin film transistor liquid crystal display panel;

Fig. 1B is a sectional view along 1B-1B in Fig. 1A;

Fig. 1C is a sectional view along 1C-1C in Fig. 1A;

2A is a schematic diagram of a thin film transistor liquid crystal display panel according to a first embodiment of the present invention;

Fig. 2B is a sectional view along 2B-2B in Fig. 2A;

Fig. 2C is a sectional view along 2C-2C in Fig. 2A;

3A is a schematic diagram of a thin film transistor liquid crystal display panel according to a second embodiment of the present invention;

Fig. 3B is a sectional view along 3B-3B in Fig. 3A;

4A is a schematic diagram of a thin film transistor liquid crystal display panel according to a third embodiment of the present invention;

Fig. 4B is a sectional view along 4B-4B in Fig. 4A;

5A is a schematic diagram of a thin film transistor liquid crystal display panel according to a fourth embodiment of the present invention;

Fig. 5B is a sectional view along 5B-5B in Fig. 5A;

6A is a schematic diagram of a thin film transistor liquid crystal display panel according to a fifth embodiment of the present invention;

Fig. 6B is a sectional view along 6B-6B in Fig. 6A;

7A is a schematic diagram of a thin film transistor liquid crystal display panel according to a sixth embodiment of the present invention;

Fig. 7B is a cross-sectional view taken along line 7B-7B in Fig. 7A.

Explanation of reference signs

100, 200, 300, 400, 500, 600, 700 panels

110, 210, 310, 410, 510, 610, 710 CF substrate

112, 212, 312, 412 frame glue

120, 220, 320, 420, 520, 620, 720 TFT substrate

122, 222, 322, 422, 622, 722 protective layer

124, 224, 324, 424, 524, 624, 724 photoresist layer

130, 230, 330, 430, 730 Display area

140, 240, 340, 440 glued area

214, 414, 514, 614, 714 side

1240, 2240, 3240, 4240, opening

4244, 5240, 6240, 7240

1242 Bubbles

Detailed ways

Please refer to FIG. 2A , FIG. 2B and FIG. 2C at the same time. 2A is a schematic diagram of a thin film transistor liquid crystal display panel according to the first embodiment of the present invention, FIG. 2B is a cross-sectional view along 2B-2B in FIG. 2A , and FIG. 2C is a cross-sectional view along 2C-2C in FIG. 2A. The thin film transistor liquid crystal display panel 200 mainly includes an upper substrate such as a CF substrate 210 and a lower substrate such as a TFT substrate 220 .

The CF substrate 210 has a bonding area 240 disposed along the side 214 of the CF substrate 210 and a display area 230 adjacent to the bonding area 240, and a layer is coated between the bonding area 240 and the TFT substrate 220 for bonding the CF substrate. 210 and the frame glue 212 of the TFT substrate 220 . The TFT substrate 220 and the CF substrate 210 are opposite to each other. The TFT substrate 220 has a covering layer such as a protective layer 222 , and a photoresist layer 224 is covered on the protective layer 222 .

The photoresist layer 224 on the TFT substrate 220 corresponding to the bonding area 240 of the CF substrate 210 has openings 2240 , which can expose a part of the protection layer 222 , and the openings 2240 are connected to the side 214 .

The sealant 212 is in contact with the photoresist layer 224 , and the sealant 212 is in contact with the protection layer 222 through the opening 2240 , so that the CF substrate 210 and the TFT substrate 220 are bonded.

Different from the existing panel 100, in the panel 200 of the present invention, the opening 2240 on the photoresist layer 224 of the TFT substrate 220 is connected to the side 214 of the CF substrate 210, that is, the opening 2240 is connected to the atmosphere. During the bonding process of the TFT substrate 220 and the CF substrate 210, that is, when the sealant 212 passes through the opening 2240 to bond the protective layer 222, the air in the opening 2240 between the protective layer 222 and the photoresist layer 224 can be discharged from the opening 2240; so that the frame glue 212 can be completely bonded to the protective layer 222, without air bubbles being mixed between the frame glue 212 and the protective layer 222 or in the frame glue 212, thereby affecting the bonding of the TFT substrate 220 and the CF substrate 210, reducing the TFT substrate 220 and the bonding strength of the CF substrate 210.

The aforementioned opening 2240 disposed on the photoresist layer 224 can expose a part of the protection layer 222 , which communicates with the side 214 of the CF substrate 210 . The purpose of communicating with the side 214 is to communicate the opening 2240 with the atmosphere, so that the air in the opening 2240 can be discharged during the process of bonding the protective layer 222 to the sealant 212 . Therefore, the above-mentioned embodiment can achieve the purpose of removing the air in the opening 2240 , and any other way of connecting the opening 2240 to the atmosphere can be an embodiment of the present invention.

Please refer to FIG. 3A and FIG. 3B at the same time. 3A is a schematic diagram of a thin film transistor liquid crystal display panel according to a second embodiment of the present invention, and FIG. 3B is a cross-sectional view along line 3B-3B in FIG. 3A. The thin film transistor liquid crystal display panel 300 also has a CF substrate 310 and a TFT substrate 320 facing it. The CF substrate 310 has a glued area 340 and a display area 330 adjacent to the glued area.

A covering layer such as a protective layer 322 and a covering layer such as a photoresist layer 324 are sequentially covered on the TFT substrate 320 . The opening 3240 on the photoresist layer 324 that can expose part of the protection layer 322 is connected to the display area 330 of the CF substrate 310 . The connection to the display area 330 can also be connected to the atmosphere. Therefore, in this embodiment, the air in the opening 3240 can be discharged smoothly when the sealant 312 is bonded to the protective layer 322 .

Please refer to FIG. 4A and FIG. 4B at the same time. 4A is a schematic diagram of a TFT-LCD panel according to a third embodiment of the present invention, and FIG. 4B is a cross-sectional view along line 4B-4B in FIG. 4A. The thin film transistor liquid crystal display panel 400 also has a CF substrate 410 and a TFT substrate 420 facing it. The CF substrate 410 has a glued area 440 disposed along a side 414 of the CF substrate 410 and a display area 430 adjacent to the glued area.

A covering layer such as a protective layer 422 and a covering layer such as a photoresist layer 424 are sequentially covered on the TFT substrate 420 . The opening 4240 on the photoresist layer 424 that can expose part of the protective layer 422 is connected to the side 414 of the CF substrate 410, and the opening 4244 is connected to the display area 430 of the CF substrate 410, and the opening 4240 and the opening 4244 is connected. Therefore, the interconnected opening 4240 and the opening 4244 both communicate with the side 414 and the display area 430 respectively, ie both communicate with the atmosphere respectively. Therefore, in this embodiment, the air in the openings 4240 and 4244 can be smoothly discharged during the process of bonding the protective layer 322 with the sealant 312 .

The openings can be connected to the side of the CF substrate and the display area respectively, or can be connected to the side of the CF substrate and the display area at the same time. Both openings can be made to communicate with the atmosphere as they communicate to the side or the display area.

Please refer to FIG. 5A , FIG. 5B , FIG. 6A , FIG. 6B , FIG. 7A and FIG. 7B at the same time. FIG. 5A is a schematic diagram of a TFT-LCD panel according to a fourth embodiment of the present invention, and FIG. 5B is a cross-sectional view along line 5B-5B in FIG. 5A . 6A is a schematic diagram of a thin film transistor liquid crystal display panel according to a fifth embodiment of the present invention, and FIG. 6B is a cross-sectional view along line 6B-6B in FIG. 6A. 7A is a schematic diagram of a thin film transistor liquid crystal display panel according to a sixth embodiment of the present invention, and FIG. 7B is a cross-sectional view along line 7B-7B in FIG. 7A. As shown in FIG. 5A and FIG. 5B, the photoresist layer 524 on the side 514 of the TFT substrate 520 close to the CF substrate 510 of the panel 500 is completely removed, and the opening 5240 is a strip-shaped opening, and the opening 5240 is connected. to side 514 .

As shown in FIG. 6A and FIG. 6B , the photoresist layer 624 on the side 614 of the TFT substrate 620 of the panel 600 close to the CF substrate 610 can expose part of the opening 6240 of the protective layer 622 to form a grid. Arranged in a shape, the opening 6240 communicates with the side 614.

In addition, as shown in FIG. 7A and FIG. 7B, the photoresist layer 724 on the TFT substrate 720 of the panel 700, the openings 7240 on which part of the protective layer 722 can be exposed are also arranged in a grid shape, and the openings 7240 One side is connected to the side 714 of the CF substrate 710 , and the other side is connected to the display area 730 of the CF substrate 710 .

The protection layer in the above embodiments can be made of silicon nitride or silicon dioxide, and the photoresist layer 124 can be made of organic materials.

In the above-mentioned embodiments, the openings on the photoresist layer that can expose part of the protective layer are all connected to the atmosphere, so that when the CF substrate and the TFT substrate are combined, there is no gap in the sealant or between the sealant and the protective layer. There will be residual air bubbles.

Therefore, the panel of the present invention can have greater strength. In this way, when an external impact force or vibration force is applied to the panel (do a reliability test on the panel), there will be no cracks at the frame rubber or between the frame rubber and the protective layer, thereby effectively improving the quality of the panel.

Therefore, the thin film transistor liquid crystal display panel disclosed in the above embodiments of the present invention has at least the advantage that the panel of the present invention has better strength than the existing panels. That is, there will be no air bubbles in the opening, so that when the panel is subjected to a large external force, the panel will not generate cracks at the sealant or the contact interface between the sealant and the protective layer, thereby affecting the display quality of the panel.

In summary, although the present invention has been disclosed above in conjunction with the embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes without departing from the spirit and scope of the present invention. and modification, so the scope of protection of the present invention is defined by the claims.

Claims (24)

1. A thin film transistor liquid crystal display panel, comprising: an upper substrate having a glued area disposed along one side of the upper substrate and a display area adjacent to the glued area; The lower substrate, opposite to the upper substrate, the lower substrate has a first covering layer, the first covering layer is covered with a second covering layer, and the second covering layer corresponding to the glued area has an exposed portion an opening of the first covering layer, and the opening communicates with the side or the display area; and A frame glue, coated between the gluing area and the lower substrate; Wherein, the sealant is in contact with the second covering layer, and the sealant is in contact with the first covering layer through the opening, so that the lower substrate and the upper substrate are adhered. 2. The panel as claimed in claim 1, wherein the first covering layer is a protective layer. 3. The panel as claimed in claim 2, wherein the passivation layer is made of silicon nitride. 4. The panel as claimed in claim 2, wherein the protection layer is made of silicon dioxide. 5. The panel as claimed in claim 1, wherein the second covering layer is a photoresist layer. 6. The panel as claimed in claim 5, wherein the photoresist layer is made of organic materials. 7. The panel as claimed in claim 1, wherein the upper substrate is a color filter substrate. 8. The panel as claimed in claim 1, wherein the lower substrate is a thin film transistor substrate. 9. A thin film transistor liquid crystal display panel, comprising: A color filter substrate having a glued area arranged along one side of the color filter substrate and a display area adjacent to the glued area; A thin-film transistor substrate, opposite to the color filter substrate, the thin-film transistor substrate has a protective layer, and a photoresist layer is covered above the protective layer, and the photoresist layer corresponding to the bonding area has an opening that exposes a portion of the protective layer and communicates with the side or the display area; and A frame glue, coated between the bonding area and the thin film transistor substrate; Wherein, the sealant is in contact with the photoresist layer, and the sealant is in contact with the protection layer through the opening, so that the TFT substrate and the color filter substrate are bonded together. 10. The panel as claimed in claim 9, wherein the passivation layer is made of silicon nitride. 11. The panel as claimed in claim 9, wherein the protection layer is made of silicon dioxide. 12. The panel as claimed in claim 9, wherein the photoresist layer is made of organic materials. 13. A thin film transistor liquid crystal display panel, comprising: an upper substrate having a glued area disposed along one side of the upper substrate and a display area adjacent to the glued area; The lower substrate, opposite to the upper substrate, the lower substrate has a first covering layer, the first covering layer is covered with a second covering layer, and the second covering layer corresponding to the glued area has an exposed portion an opening of the first covering layer, and the opening communicates with the side and the display area; and A frame glue, coated between the gluing area and the lower substrate; Wherein, the sealant is in contact with the second covering layer, and the sealant is in contact with the first covering layer through the opening, so that the lower substrate and the upper substrate are adhered. 14. The panel of claim 13, wherein the first covering layer is a protective layer. 15. The panel as claimed in claim 14, wherein the passivation layer is made of silicon nitride. 16. The panel as claimed in claim 14, wherein the protection layer is made of silicon dioxide. 17. The panel of claim 13, wherein the second covering layer is a photoresist layer. 18. The panel as claimed in claim 17, wherein the photoresist layer is made of organic materials. 19. The panel of claim 13, wherein the upper substrate is a color filter substrate. 20. The panel of claim 13, wherein the lower substrate is a thin film transistor substrate. 21. A thin film transistor liquid crystal display panel, comprising: A color filter substrate having a glued area arranged along one side of the color filter substrate and a display area adjacent to the glued area; A thin-film transistor substrate, opposite to the color filter substrate, the thin-film transistor substrate has a protective layer, and a photoresist layer is covered above the protective layer, and the photoresist layer corresponding to the bonding area has an opening that can expose part of the protective layer, and the opening communicates with the side and the display area; and A frame glue, coated between the bonding area and the thin film transistor substrate; Wherein, the sealant is in contact with the photoresist layer, and the sealant is in contact with the protection layer through the opening, so that the TFT substrate and the color filter substrate are bonded together. 22. The panel as claimed in claim 21, wherein the passivation layer is made of silicon nitride. 23. The panel as claimed in claim 21, wherein the protection layer is made of silicon dioxide. 24. The panel as claimed in claim 21, wherein the photoresist layer is made of organic material.

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