Liquid crystal display panel and manufacturing method thereof, and display device

Abstract

The present application provides a liquid crystal display panel and its manufacturing method, and a display device, which relate to the field of display technology, in order to solve the problem that the liquid crystal display has good display effect when viewed straight on, but poor display effect when viewed at an angle. The liquid crystal display panel includes a color filter substrate, a liquid crystal layer, and a thin film transistor substrate. The color filter substrate includes a glass substrate and a black matrix and a color filter layer sequentially covered on the glass substrate. The surface of the glass substrate is provided with a plurality of grooves of different depths. The black matrix and the color filter layer are distributed in the plurality of grooves, and corresponding to the positions of the grooves of different depths, the thickness of the liquid crystal layer maintains the same change trend as the depth of the plurality of grooves. When the line of sight gradually changes from straight on to an angle of view, the depth of the plurality of grooves gradually decreases, the thickness of the liquid crystal layer gradually decreases, and the display viewing angle gradually increases, thereby compensating for the difference in display effect caused by the change in viewing angle.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a liquid crystal display panel and a manufacturing method thereof, and a display device. Background Art

[0002] When you observe a flat LCD screen from different directions, the brightness, contrast, and color of the screen will be different due to the different angles at which your line of sight enters the liquid crystal. When you look directly at the screen, your line of sight is perpendicular to the screen, and the display effect is good; when you squint at the screen, your line of sight is outside the viewing angle of the screen, resulting in low contrast and poor color.

[0003] Compared with flat screens, curved screens are more ergonomic, allowing our sight lines to reach the screen at the same distance. However, the existing manufacturing process of curved screens for LCD displays generally bends the flat LCD panel to match a backlight panel with a certain curvature. However, due to the uneven stress of the glass substrate of the curved LCD panel, and the inconsistent curvature of the thin-film transistor substrate and the color filter substrate, the LCD display has a good display effect when viewed straight in the middle, but has an oblique viewing angle around it, with low contrast and poor color, which seriously affects the display effect. Summary of the invention

[0004] The present application intends to provide a liquid crystal display panel and a manufacturing method thereof, and a display device, which are used to solve the problem of decreased display contrast and color difference caused by viewing angle of liquid crystal displays.

[0005] A first aspect of the present application provides a liquid crystal display panel, comprising a color filter substrate, a liquid crystal layer and a thin film transistor substrate, wherein the color filter substrate comprises a glass substrate and a black matrix and a color filter layer sequentially covered on the glass substrate, wherein a plurality of grooves of different depths are provided on the surface of the glass substrate, the black matrix and the color filter layer are distributed in the plurality of grooves, and corresponding to the positions of the grooves of different depths, the thickness of the liquid crystal layer maintains the same variation trend as the depth of the plurality of grooves.

[0006] A second aspect of the present application further provides a display device, which includes a liquid crystal display panel as described in the above technical solution, and also includes a backlight module, wherein the backlight module is located on a side of the liquid crystal display panel away from its display surface.

[0007] The third aspect of the present application also provides a method for manufacturing a liquid crystal display panel, comprising: forming a color filter substrate, wherein forming the color filter substrate comprises forming a plurality of grooves of different depths on a surface of a glass substrate, forming a black matrix and a color filter layer on the glass substrate, and the black matrix and the color filter layer are distributed in the plurality of grooves; and aligning the color filter substrate with a thin film transistor substrate, and forming a liquid crystal layer between the color filter substrate and the thin film transistor substrate; wherein, corresponding to the positions of the grooves of different depths, the thickness of the liquid crystal layer maintains the same variation trend as the depth of the grooves.

[0008] Compared with the prior art, the surface of the glass substrate is provided with a plurality of grooves of different depths, the black matrix and the color filter layer are distributed in the plurality of grooves, and corresponding to the positions of the grooves of different depths, the thickness of the liquid crystal layer maintains the same variation trend as the depth of the plurality of grooves. When the depth of the plurality of grooves is greater, the thickness of the liquid crystal layer is greater, and the display viewing angle is smaller; when the depth of the plurality of grooves is smaller, the thickness of the liquid crystal layer is smaller, and the display viewing angle is larger. When the line of sight gradually changes from straight view to oblique view / upward view, the thickness of the liquid crystal layer gradually decreases, and the display viewing angle gradually increases, which improves the problem of low contrast and poor color at the edges and corners of the liquid crystal display panel caused by the viewing angle, so that the screen has the same display effect when observed from all angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1a A cross-sectional view of a liquid crystal display panel provided in accordance with an embodiment of the present application.

[0010] Figure 1b A cross-sectional view of a glass substrate provided in accordance with an embodiment of the present application.

[0011] Figure 1c A top view of a glass substrate provided in accordance with an embodiment of the present application.

[0012] Figure 2a A cross-sectional view of a liquid crystal display panel provided according to another embodiment of the present application.

[0013] Figure 2b A cross-sectional view of a glass substrate provided in accordance with another embodiment of the present application.

[0014] Figure 2c A top view of a glass substrate provided in accordance with another embodiment of the present application.

[0015] Figure 3 A display device provided in an embodiment of the present application.

[0016] Figure 4 A flow chart of a method for manufacturing a liquid crystal display panel provided in one embodiment of the present application.

[0017] Figure 5 A flow chart of a method for manufacturing a liquid crystal display panel provided in another embodiment of the present application.

[0018] Main component symbols

[0019] Liquid crystal display panels 10A, 10B

[0020] Color filter substrate 100

[0021] Liquid crystal layer 200

[0022] Thin film transistor substrate 300

[0023] Frame glue 400

[0024] Display area 410

[0025] Non-display area 420

[0026] Glass substrate 110

[0027] Black Matrix 120

[0028] Color filter layer 130

[0029] Protective layer 140

[0030] Groove 111

[0031] Width L

[0032] Red filter layer 131

[0033] Green filter layer 132

[0034] Blue filter layer 133

[0035] Edge Area 411

[0036] Central Area 412

[0037] First side 413

[0038] Second side 414

[0039] Display device 20

[0040] Backlight module 500

[0041] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The thickness of each film layer and the shape of the region in the drawings do not reflect the actual proportion of the liquid crystal display panel, and the purpose is only to illustrate the content of the present invention.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0044] In order to further explain the technical means and effects adopted by the present application to achieve the intended purpose, the present application is described in detail below in conjunction with the accompanying drawings and preferred implementation methods.

[0045] See also Figure 1a The liquid crystal display panel 10A provided in the embodiment of the present application includes: a color filter substrate 100, a liquid crystal layer 200, a thin film transistor substrate 300 and a sealant 400, wherein the thin film transistor substrate 300 is arranged opposite to the color filter substrate 100; the liquid crystal layer 200 is filled between the color filter substrate 100 and the thin film transistor substrate 300; the sealant 400 surrounds the liquid crystal layer 200 and connects the thin film transistor substrate 300 with the edge of the color filter substrate 100, so that the thin film transistor substrate 300 and the color filter substrate 100 maintain a certain gap. In addition, the sealant 400 can also seal the liquid crystal, preventing the liquid crystal from leaking and preventing external pollutants from entering.

[0046] See also Figure 1a , Figure 1c The liquid crystal display panel 10A includes a display area 410 and a non-display area 420 surrounding the display area 410 . The sealant 400 is located in the non-display area 420 .

[0047] The color filter substrate 100 includes a glass substrate 110 , a black matrix 120 covering the glass substrate 110 , a color filter layer 130 covering the glass substrate 110 , and a protection layer 140 covering the color filter layer 130 and the black matrix 120 .

[0048] The color filter layer 130 includes a red filter layer 131, a green filter layer 132, and a blue filter layer 133 that are spaced apart on the glass substrate 110. The red filter layer 131, the green filter layer 132, and the blue filter layer 133 respectively filter out light of a specific wavelength range from a white light source, thereby displaying light of different colors.

[0049] The black matrix 120 is formed at the junction of any adjacent red filter layer 131, the green filter layer 132, and the blue filter layer 133 to absorb the critical light of the adjacent filter layers, reduce the color mixing interference between pixels, and prevent the color contrast from deteriorating. On the other hand, the black matrix 120 is also formed at the position of the glass substrate 110 corresponding to the non-display area 420 to achieve the effect of shielding light.

[0050] See also Figure 1b , Figure 1c The glass substrate 110 is provided with a plurality of grooves 111 of different depths on the surface of the display area 410. The depths of the plurality of grooves 111 gradually increase in a direction from the edge area 411 of the display area 410 to the central area 412 of the display area 410. The width L of each groove 111 is 0.8 cm-1.2 cm, and the depth difference between two adjacent grooves is 0.1 μm-1 μm.

[0051] Figure 1b , Figure 1c The width L of the middle groove 111 and the number of the grooves 111 do not reflect the actual proportion of the liquid crystal display panel, and the purpose is only to illustrate the content of this application. Figure 1a The number of the red filter layer 131 , the green filter layer 132 , and the blue filter layer 133 and their distribution on the groove 111 do not reflect the actual situation of the color filter substrate 100 , and are only intended to illustrate the content of this application. Figure 1c The boundary shape between the adjacent grooves 111 does not reflect the actual surface morphology of the glass substrate 110 , and is only intended to illustrate the content of this application.

[0052] In some embodiments, in the above-mentioned liquid crystal display panel 10A provided in the embodiment of the present application, the width L of each of the grooves 111 is 1 cm, the depth difference between two adjacent grooves 111 is 0.1 μm, and the depths of the plurality of grooves 111 gradually increase in a direction from the edge area 411 of the display area 410 to the center area 412 of the display area 410 .

[0053] In some embodiments, in the above-mentioned liquid crystal display panel 10A provided in the embodiment of the present application, the width L of each of the grooves 111 is 1 cm, the depth difference between two adjacent grooves 111 is 1 μm, and the depth of the plurality of grooves 111 gradually increases in a direction from the edge area 411 of the display area 410 to the center area 412 of the display area 410 .

[0054] The black matrix 120 and the color filter layer 130 are distributed in the plurality of grooves 111, and the protective layer 140 covers the color filter layer 130 and the black matrix 120. Corresponding to the positions of the grooves 111 of different depths, the thickness of the protective layer 140 remains unchanged, so the surface of the protective layer 140 close to the liquid crystal layer 200 is consistent with the surfaces of the plurality of grooves 111, and the thickness of the liquid crystal layer 200 maintains the same variation trend as the depth of the plurality of grooves 111. That is, corresponding to the positions of the grooves 111 of different depths on the surface of the glass substrate 110, the thickness of the liquid crystal layer 200 gradually increases in the direction from the edge area 411 of the display area 410 to the central area 412 of the display area 410.

[0055] The liquid crystal display panel 10A is suitable for situations where the observer is looking straight ahead. When the observer's line of sight falls from the central area 412 of the display area 410 to the edge area 411 of the display area 410, the thickness of the liquid crystal layer 200 becomes smaller, and the display viewing angle of the liquid crystal display panel 10A becomes larger, which compensates for the difference in display effects caused by the change in viewing angle and improves the problems of low contrast and poor color when squinting.

[0056] See also Figure 2a The embodiment of the present application provides another liquid crystal display panel 10B, including: a color filter substrate 100, a liquid crystal layer 200, a thin film transistor substrate 300 and a frame glue 400, wherein the thin film transistor substrate 300 is arranged opposite to the color filter substrate 100; the liquid crystal layer 200 is filled between the color filter substrate 100 and the thin film transistor substrate 300; the frame glue 400 surrounds the liquid crystal layer 200 and connects the thin film transistor substrate 300 and the edge of the color filter substrate 100.

[0057] See also Figure 2a , Figure 2c The liquid crystal display panel 10B is divided into a display area 410 and a non-display area 420 surrounding the display area 410 . The sealant 400 is located in the non-display area 420 .

[0058] The color filter substrate 100 includes a glass substrate 110 , a black matrix 120 covering the glass substrate 110 , a color filter layer 130 covering the glass substrate 110 , and a protection layer 140 covering the color filter layer 130 and the black matrix 120 .

[0059] The color filter layer 130 includes a red filter layer 131, a green filter layer 132, and a blue filter layer 133 that are spaced apart on the glass substrate 110. The red filter layer 131, the green filter layer 132, and the blue filter layer 133 respectively filter out light of a specific wavelength range from a white light source, thereby displaying light of different colors.

[0060] The black matrix 120 is formed at the junction of any adjacent red filter layer 131, the green filter layer 132, and the blue filter layer 133 to absorb the critical light of the adjacent filter layers, reduce the color mixing interference between pixels, and prevent the color contrast from deteriorating. On the other hand, the black matrix 120 is also formed at the position of the glass substrate 110 corresponding to the non-display area 420 to achieve the effect of shielding light.

[0061] See also Figure 2b , Figure 2c , the glass substrate 110 is provided with a plurality of grooves 111 of different depths on the surface of the display area 410. In the direction from the first side 413 of the display area 410 to the second side 414 of the display area 410, the depths of the plurality of grooves 111 gradually increase. The width L of each groove 111 is 0.8cm-1.2cm, and the depth difference between two adjacent grooves 111 is 0.1μm-1μm. In some embodiments, the first side 413 is the relatively upper side (for example, the side close to the upper edge of the liquid crystal display panel 10B) when the observer views the display state of the liquid crystal display panel 10B, and the second side 414 is the relatively lower side (for example, the side close to the lower edge of the liquid crystal display panel 10B).

[0062] Figure 2b , Figure 2c The width L and number of the middle grooves 111 do not reflect the actual proportion of the liquid crystal display panel, and the purpose is only to illustrate the content of this application. Figure 2a The number of the red filter layer 131 , the green filter layer 132 , and the blue filter layer 133 and their distribution on the groove 111 do not reflect the actual situation of the color filter substrate 100 , and are only intended to illustrate the content of this application. Figure 2c The boundary shape between the adjacent grooves 111 does not reflect the actual surface morphology of the glass substrate 110 , and is only intended to illustrate the content of this application.

[0063] In some embodiments, in the above-mentioned liquid crystal display panel 10B provided in the embodiment of the present application, the width L of each of the grooves 111 is 1 cm, the depth difference between two adjacent grooves 111 is 0.1 μm, and the depths of the plurality of grooves 111 gradually increase in a direction from the first side 413 of the display area 410 to the second side 414 of the display area 410 .

[0064] In some embodiments, in the above-mentioned liquid crystal display panel 10B provided in the embodiment of the present application, the width L of each of the grooves 111 is 1 cm, the depth difference between two adjacent grooves 111 is 1 μm, and the depth of the plurality of grooves 111 gradually increases in a direction from the first side 413 of the display area 410 to the second side 414 of the display area 410 .

[0065] The black matrix 120 and the color filter layer 130 are distributed in the plurality of grooves 111, and the protective layer 140 covers the color filter layer 130 and the black matrix 120. The thickness of the protective layer 140 remains unchanged corresponding to the positions of the grooves 111 of different depths, so that the surface of the protective layer 140 close to the liquid crystal layer 200 is consistent with the surfaces of the plurality of grooves 111, and the thickness of the liquid crystal layer 200 maintains the same variation trend as the depth of the plurality of grooves 111. That is, corresponding to the positions of the grooves 111 of different depths on the surface of the glass substrate 110, the thickness of the liquid crystal layer 200 gradually increases in the direction from the first side 413 of the display area 410 to the second side 414 of the display area 410.

[0066] The liquid crystal display panel 10B is suitable for situations where an observer looks up. When the liquid crystal display panel 10B is in a suspended state, the first side 413 of the display area 410 is farther away from the observer than the second side 414 of the display area 410. When the observer's line of sight falls from the second side 414 of the display area 410 to the first side 413 of the display area 410, the thickness of the liquid crystal layer 200 becomes smaller, and the display viewing angle of the liquid crystal display panel 10B becomes larger, which makes up for the difference in display effect caused by the change in viewing angle and improves the problem of low contrast and poor color when looking up.

[0067] See also Figure 3 The embodiment of the present application provides a display device 20, comprising the above-mentioned liquid crystal display panel, and also comprising a backlight module 500, wherein the backlight module 500 is located on a side of the liquid crystal display panel away from its display surface.

[0068] The display device has the same advantages as the above-mentioned liquid crystal display panel over the prior art, which will not be described in detail here.

[0069] An embodiment of the present application also provides a method for manufacturing a liquid crystal display panel, which is used to manufacture the liquid crystal display panel as described in the above embodiment. The method for manufacturing the liquid crystal display panel includes: forming a glass substrate, wherein a plurality of grooves of different depths are provided on the surface of the glass substrate, and corresponding to the positions of the grooves of different depths, the thickness of the liquid crystal layer maintains the same change trend as the depth of the plurality of grooves.

[0070] Specifically, see Figure 4 The manufacturing method of the liquid crystal display panel is specifically as follows.

[0071] Step S11, providing a glass with two relatively flat surfaces, and cleaning the surface of the glass.

[0072] Step S12, folding the glass concavely so that two opposite surfaces of the glass form a concave surface and a convex surface respectively.

[0073] Step S13, adding etching solution to the concave surface of the glass.

[0074] Step S14, using different amounts or concentrations of etching solution to cause different degrees of damage to different positions of the concave surface of the glass, so that grooves of different depths are formed on the concave surface of the glass, wherein the grooves formed at positions with high etching solution concentration or large amount are deep, and the grooves formed at positions with low etching solution concentration or small amount are shallow.

[0075] Step S15, folding the glass concavely until the convex surface is a flat surface, thereby forming a glass substrate.

[0076] Step S16, cleaning the glass substrate.

[0077] Step S17, forming a black matrix on the plurality of grooves of the glass substrate.

[0078] Step S18, forming a color filter layer on the plurality of grooves of the glass substrate. The color filter layer includes a red filter layer, a green filter layer and a blue filter layer, and the filter layers are separated by a black matrix.

[0079] Step S19, forming a protective layer on the black matrix and the color filter layer, and the thickness of the protective layer remains unchanged, thereby forming a color filter substrate.

[0080] In step S20 , a frame glue having an injection port is formed on opposite edges of the color filter substrate and the thin film transistor substrate to align and adhere the color filter substrate to the thin film transistor substrate.

[0081] In step S21 , liquid crystal molecules are injected between the color filter substrate and the thin film transistor substrate through the injection port of the sealant to form a liquid crystal layer whose thickness varies with the depth of the groove of the glass substrate.

[0082] Step S22 , sealing the injection port to form a liquid crystal display panel in which the thickness of the liquid crystal layer varies with the depth of the groove of the glass substrate.

[0083] An embodiment of the present application provides another method for manufacturing a liquid crystal display panel, which is used to manufacture a liquid crystal display panel as described in the above embodiment. The method for manufacturing a liquid crystal display panel includes: forming a glass substrate, wherein a plurality of grooves of different depths are provided on the surface of the glass substrate, and corresponding to the positions of the grooves of different depths, the thickness of the liquid crystal layer maintains the same variation trend as the depth of the plurality of grooves.

[0084] Specifically, see Figure 5 The manufacturing method of the liquid crystal display panel is specifically as follows.

[0085] Step S101, providing a glass having two relatively flat surfaces, and cleaning the surface of the glass.

[0086] Step S102, adding a grinding liquid between the grinding machine table and the surface of the glass, wherein the grinding liquid is a nano-diamond grinding liquid.

[0087] Step S103, grinding different positions of the glass surface using grinding machines with different curvatures, and forming grooves of different depths on the glass surface by using different pressures between the grinding machine and the glass surface, thereby forming a glass substrate.

[0088] In step S104, the glass substrate is cleaned.

[0089] Step S105: forming a black matrix on the plurality of grooves of the glass substrate.

[0090] Step S106 , forming color filter layers on the plurality of grooves of the glass substrate, including a red filter layer, a green filter layer and a blue filter layer, wherein the filter layers are separated by a black matrix.

[0091] Step S107, forming a protective layer on the black matrix and the color filter layer, and the thickness of the protective layer remains unchanged, thereby forming a color filter substrate.

[0092] In step S108, a frame glue having an injection port is formed on opposite edges of the color filter substrate and the thin film transistor substrate to align and adhere the color filter substrate to the thin film transistor substrate.

[0093] Step S109: injecting liquid crystal molecules between the color filter substrate and the thin film transistor substrate through the injection port of the sealant to form a liquid crystal layer whose thickness varies with the depth of the groove of the glass substrate.

[0094] Step S110 , sealing the injection port to form a liquid crystal display panel in which the thickness of the liquid crystal layer varies with the depth of the groove of the glass substrate.

[0095] The nano-diamond grinding liquid is formed by uniformly dispersing diamond micropowder in water, has dispersion stability, is suitable for ultra-precision polishing, can meet the requirements of optical glass and gemstones for processing accuracy, and can improve the quality of the processed surface while maintaining the grinding rate.

[0096] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A liquid crystal display panel, comprising a color filter substrate, a liquid crystal layer and a thin film transistor substrate, wherein the color filter substrate comprises a glass substrate, a black matrix covered on the glass substrate and a color filter layer covered on the glass substrate, characterized in that: The surface of the glass substrate is provided with a plurality of grooves of different depths, the black matrix and the color filter layer are distributed in the plurality of grooves, and corresponding to the positions of the grooves of different depths, the thickness of the liquid crystal layer maintains the same variation trend as the depth of the plurality of grooves; Wherein, the depths of the plurality of grooves gradually increase in a direction from the edge area of ​​the glass substrate to the central area of ​​the glass substrate; or, the glass substrate has a first side and a second side opposite to each other, and the depths of the plurality of grooves gradually increase in a direction from the first side to the second side; The width of each groove is 0.8 cm-1.2 cm, and the depth difference between two adjacent grooves is 0.1 μm-1 μm.

2. The liquid crystal display panel according to claim 1, characterized in that: The thin film transistor substrate and the color filter substrate are arranged opposite to each other; the liquid crystal layer is filled between the color filter substrate and the thin film transistor substrate.

3. A display device, characterized in that: It comprises the liquid crystal display panel as described in any one of claims 1 to 2, and also comprises a backlight module, wherein the backlight module is located on a side of the liquid crystal display panel away from its display surface.

4. A method for manufacturing a liquid crystal display panel, used to manufacture the liquid crystal display panel as claimed in any one of claims 1 to 2, characterized in that: include: Forming a color filter substrate, wherein forming the color filter substrate comprises forming a plurality of grooves of different depths on a surface of a glass substrate, forming a black matrix and a color filter layer on the glass substrate, wherein the black matrix and the color filter layer are distributed in the plurality of grooves; and Aligning the color filter substrate with a thin film transistor substrate, and forming a liquid crystal layer between the color filter substrate and the thin film transistor substrate; Wherein, corresponding to the positions of the plurality of grooves of different depths, the thickness of the liquid crystal layer and the depths of the plurality of grooves maintain the same variation trend.

5. The method for manufacturing a liquid crystal display panel according to claim 4, characterized in that: A plurality of grooves with different depths are formed on the surface of the glass substrate by etching.

6. The method for manufacturing a liquid crystal display panel according to claim 5, characterized in that: The method of etching the surface of the glass substrate to form a plurality of grooves of different depths comprises: folding the glass concavely so that the glass forms opposite concave and convex surfaces; Adding etching liquid to the concave surface of the glass, and etching the concave surface of the glass with the etching liquid to form a plurality of grooves of different depths; The glass is concavely folded until the convex surface is a flat surface, thereby forming the glass substrate.

7. The method for manufacturing a liquid crystal display panel according to claim 4, characterized in that: A grinding method is adopted to form a plurality of grooves with different depths on the surface of the glass substrate.

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