CN118259509A

CN118259509A - Liquid crystal display panel and liquid crystal display device

Info

Publication number: CN118259509A
Application number: CN202211683542.4A
Authority: CN
Inventors: 郭远辉; 石侠; 王超
Original assignee: BOE Technology Group Co Ltd; Wuhan BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Wuhan BOE Optoelectronics Technology Co Ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2024-06-28

Abstract

The embodiment of the invention discloses a liquid crystal display panel and a liquid crystal display device. In a specific embodiment, the liquid crystal display panel comprises an array substrate, a box alignment substrate and a liquid crystal layer, wherein the box alignment substrate is arranged opposite to the array substrate, the liquid crystal layer is positioned between the array substrate and the box alignment substrate, the array substrate comprises a first substrate, a driving circuit layer, a flat layer, a pixel electrode and a first alignment film, the driving circuit layer, the flat layer, the pixel electrode and the first alignment film are sequentially stacked on the first substrate, a through hole for electrically connecting the pixel electrode and the driving circuit layer is formed in the flat layer, a concave part is formed at the position of the through hole, the box alignment substrate comprises a second substrate, and a public electrode and a second alignment film which are sequentially stacked on the second substrate, the box alignment substrate is provided with a convex structure for enabling the public electrode to form a convex part, and orthographic projection of the convex part on the first substrate and orthographic projection of the concave part on the first substrate are overlapped. The implementation mode can effectively improve the phenomenon of uneven display pictures.

Description

Liquid crystal display panel and liquid crystal display device

Technical Field

The invention relates to the technical field of display. And more particularly, to a liquid crystal display panel and a liquid crystal display device.

Background

Currently, in a liquid crystal display device using a liquid crystal display panel such as a vertical alignment type (VERTICAL ALIGNMENT, VA) and a twisted nematic type (TWISTED NEMATIC, TN), gray scale differences between some display positions and other display positions often occur, so that a display screen is uneven, and a display effect is affected.

Disclosure of Invention

The invention aims to provide a liquid crystal display panel and a liquid crystal display device, which are used for solving at least one of the problems existing in the prior art.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the invention provides a liquid crystal display panel, which comprises an array substrate, a box-matching substrate and a liquid crystal layer, wherein the box-matching substrate is arranged opposite to the array substrate, the liquid crystal layer is positioned between the array substrate and the box-matching substrate, the array substrate comprises a first substrate, a driving circuit layer, a flat layer, a pixel electrode and a first alignment film, the driving circuit layer, the flat layer, the pixel electrode and the first alignment film are sequentially stacked on the first substrate, a through hole for electrically connecting the pixel electrode and the driving circuit layer is formed in the flat layer, a concave part is formed at the through hole, the box-matching substrate comprises a second substrate, and a public electrode and a second alignment film which are sequentially stacked on the second substrate, wherein the box-matching substrate is provided with a convex structure enabling the public electrode to form a convex part, and an overlapping area exists between the orthographic projection of the convex part on the first substrate and the orthographic projection of the concave part on the first substrate.

Optionally, the orthographic projection of the protruding portion on the first substrate covers the orthographic projection of the recessed portion on the first substrate, or the orthographic projection of the recessed portion on the first substrate covers the orthographic projection of the protruding portion on the first substrate.

Optionally, an orthographic projection of the protruding portion on the first substrate overlaps an orthographic projection of the recessed portion on the first substrate.

Optionally, the height of the protruding portion is substantially equal to the depth of the recessed portion.

Optionally, the pair of box substrates further includes a black matrix layer disposed between the second substrate and the common electrode, the black matrix layer forming the bump structure.

Optionally, the pair of box substrates further includes a color resist layer disposed between the second substrate and the common electrode, the color resist layer forming the bump structure.

Optionally, the pixel electrode is an indium tin oxide electrode or an indium zinc oxide electrode, and/or the common electrode is an indium tin oxide electrode or an indium zinc oxide electrode.

Optionally, the first alignment film and/or the second alignment film is a polyimide alignment film.

Optionally, the planarization layer is an organic planarization layer.

A second aspect of the present invention provides a liquid crystal display device comprising the liquid crystal display panel provided in the first aspect of the present invention.

The beneficial effects of the invention are as follows:

According to the technical scheme, the common electrode on the opposite box substrate side is arranged to form the convex part, and the concave part of the pixel electrode on the opposite array substrate side corresponds to the convex part, so that the influence of the electric field force of the convex part position of the common electrode on liquid crystal molecules can be enhanced, even if the situation that the first alignment film on the array substrate side cannot completely cover the edge of the concave part of the pixel electrode due to the contact angle during coating occurs, the liquid crystal torsion state of the positions is similar to or even the same as that of the position where the first alignment film completely covers the edge of the concave part of the pixel electrode, and therefore, gray level difference can be effectively improved, display screen non-uniformity phenomenon is effectively improved, and display effect is improved.

Drawings

The following describes the embodiments of the present invention in further detail with reference to the drawings.

Fig. 1 is a schematic diagram showing a twisted state of a liquid crystal under a structure of a conventional liquid crystal display panel.

Fig. 2 is a schematic view showing a liquid wet film coated with an alignment film of a conventional liquid crystal display panel.

Fig. 3 shows a schematic diagram of a dry film of an alignment film obtained after curing the liquid wet film shown in fig. 2.

Fig. 4 is a schematic view showing another alignment film coated liquid wet film of the existing liquid crystal display panel.

Fig. 5 shows a schematic diagram of a dry film of an alignment film obtained after curing the liquid wet film shown in fig. 4.

Fig. 6 is a schematic diagram showing a twisted state of liquid crystal in another structure of the conventional liquid crystal display panel.

Fig. 7 is a schematic diagram showing a twisted state of a liquid crystal under a structure of a liquid crystal display panel according to an embodiment of the invention.

Fig. 8 is a schematic diagram showing a twisted state of a liquid crystal under another structure of the liquid crystal display panel according to the embodiment of the invention.

Fig. 9 is a schematic diagram showing another structure of a liquid crystal display panel according to an embodiment of the invention.

Detailed Description

The terms "on … …", "formed on … …" and "disposed on … …" as used herein may mean that one layer is formed directly on or disposed on another layer, or that one layer is formed indirectly on or disposed on another layer, i.e., that other layers are present between the two layers.

It should be noted that although the terms "first," "second," etc. may be used herein to describe various elements, components, elements, regions, layers and/or sections, these elements, components, elements, regions, layers and/or sections should not be limited by these terms. Rather, these terms are used to distinguish one component, member, element, region, layer and/or section from another. Thus, for example, a first component, a first member, a first element, a first region, a first layer, and/or a first portion discussed below could be termed a second component, a second member, a second element, a second region, a second layer, and/or a second portion without departing from the teachings of the present invention.

In the present invention, unless otherwise indicated, the term "co-layer arrangement" is used to mean that two layers, components, members, elements or portions may be formed by the same manufacturing process (e.g., patterning process, etc.), and that the two layers, components, members, elements or portions are generally formed of the same material. For example, the two or more functional layers are arranged in the same layer, meaning that the functional layers arranged in the same layer may be formed using the same material layer and the same manufacturing process, so that the manufacturing process of the display substrate may be simplified.

In the present invention, the expression "patterning process" generally includes the steps of coating of photoresist, exposure, development, etching, stripping of photoresist, and the like, unless otherwise specified. The expression "one patterning process" means a process of forming a patterned layer, feature, component, etc. using a single mask.

The inventors studied this problem, and found that the above-mentioned display non-uniformity phenomenon is caused by an array substrate side alignment film in the existing liquid crystal display panel, specifically, for example, the liquid crystal display panel adopts a UV2A (ultraviolet light vertical alignment) photoalignment technique, the key of UV2A is to control the tilt of liquid crystal molecules in the ultraviolet direction with high accuracy by using a special polymer material as an alignment film, the accuracy unit is picometers (one megameter), and the advantage of UV2A is that the liquid crystal display panel is a simple structure without protrusions and slits. For example, as shown in fig. 1, the conventional liquid crystal display panel includes an array substrate 100, a counter substrate 110 disposed opposite to the array substrate 100, and a liquid crystal layer 120 disposed between the array substrate 100 and the counter substrate 110, wherein the array substrate 100 includes a first substrate 101, a driving circuit layer 102, a flat layer 103, a pixel electrode 104 and a first alignment film 105 sequentially stacked on the first substrate 101, the flat layer 103 is provided with a via hole for electrically connecting the pixel electrode 104 and the driving circuit layer 102, the pixel electrode 104 forms a recess 1041 at the via hole of the flat layer 103, the counter substrate includes a second substrate 111, and a common electrode 112 and a second alignment film 113 sequentially stacked on the second substrate 111, wherein the pixel electrode 104 is arranged in an array, and each sub-pixel region includes one pixel electrode 104. For example, as shown in fig. 1, the via hole formed in the flat layer 103 for electrically connecting the pixel electrode 104 and the driving circuit layer 102 is generally deeper, and when the first alignment film 105 made of Polyimide (PI) material is coated with a liquid wet film, a contact angle exists between the first alignment film and the edge of the recess 1041 formed at the via hole of the flat layer 103 by the pixel electrode 104, and after curing:

(1) For example, the coating liquid wet film of fig. 2 and the cured dry film shown in fig. 3, the positions of edges of the recesses 1041 formed at the via holes of the flat layer 103 corresponding to some of the pixel electrodes 104 of the first alignment film 105 are normally tiled, the cured first alignment film 105 may cover the edges of the recesses 1041 formed at the via holes of the flat layer 103 corresponding to these pixel electrodes 104, and the areas of the first alignment film 105 that are normally tiled so as to completely cover the edges of the recesses 1041 formed at the via holes of the flat layer 103 corresponding to the pixel electrodes 104 may be referred to as OK areas, for example, as shown in fig. 1;

(2) For example, the coating liquid wet film of fig. 4 and the cured dry film shown in fig. 5, the positions of edges of the recesses 1041 formed at the via holes of the flat layer 103 corresponding to some of the pixel electrodes 104 of the first alignment film 105 cannot be completely coated, the cured first alignment film 105 cannot completely cover the edges of the recesses 1041 formed at the via holes of the flat layer 103 corresponding to these pixel electrodes 104, and the region of the edges of the recesses 1041 formed at the via holes of the flat layer 103 not being completely coated and thus cannot completely cover these pixel electrodes 104 may be referred to as NG region, for example, as shown in fig. 6.

As shown in fig. 1 and 6, for the first alignment film 105 to completely cover the OK region of the edge of the recess 1041 of the pixel electrode 104 formed at the via hole of the flat layer 103, the liquid crystal molecules of the liquid crystal layer 120 may be affected by the alignment force of the first alignment film 105; whereas for NG regions of the edges of the recesses 1041 of the pixel electrode 104 formed at the via holes of the flat layer 103, which are not completely covered by the first alignment film 105, the liquid crystal molecules of the liquid crystal layer 120 are not affected by the alignment force. Then, as compared with fig. 1 and 6, there is a difference in the twisted states of the liquid crystal molecules of the OK region and the NG region, and thus, there is a gray level difference between the OK region and the NG region, resulting in a phenomenon of uneven display screen.

In view of this, as shown in fig. 7, an embodiment of the present invention provides a liquid crystal display panel, including an array substrate 700, a pair of case substrates 710 disposed opposite to the array substrate 700, and a liquid crystal layer 720 disposed between the array substrate 700 and the pair of case substrates 710, the array substrate 700 includes a first substrate 701, and a driving circuit layer 702, a flat layer 703, a pixel electrode 704, and a first alignment film 705 sequentially stacked on the first substrate 701, the flat layer 703 is provided with a via hole for electrically connecting the pixel electrode 704 with the driving circuit layer 702, the pixel electrode 704 forms a recess 7041 at the via hole of the flat layer 703, the pair of case substrates 710 includes a second substrate 711, and a common electrode 712 and a second alignment film 713 sequentially stacked on the second substrate 711, wherein the pair of case substrates 710 is provided with a bump structure 7141 such that the common electrode forms a bump 7121, and an orthographic projection of the bump 7121 on the first substrate 701 and orthographic projection of the recess 7041 on the first substrate 701 have an overlapping region.

Thus, in the liquid crystal display panel provided in this embodiment, by providing the common electrode 712 on the side of the case substrate to form the protruding portion 7121 and the recessed portion 7041 of the pixel electrode 704 on the side of the corresponding array substrate, the influence of the electric field force at the position of the protruding portion 7121 of the common electrode 712 on the liquid crystal molecules can be enhanced, so that even if the situation occurs in which the first alignment film 705 does not completely cover the edge of the recessed portion 7041 formed at the via hole of the flat layer 703 by the contact angle when being coated, the liquid crystal twist state at these positions is similar to or even the same as the liquid crystal twist state at the position in which the first alignment film 705 completely covers the edge of the recessed portion 7041 formed at the via hole of the flat layer 703 by the pixel electrode 704, for example, as shown in fig. 7 and 8, thereby effectively improving the gray scale difference, effectively improving the display screen non-uniformity phenomenon, and improving the display effect.

In a specific example, the array substrate 700 and the counter substrate 710 are bonded together by a sealant, and the liquid crystal layer 720 is formed in a closed region surrounded by the sealant.

In a specific example, the Array substrate 700 may also be referred to as an Array substrate or a TFT substrate, and the driving circuit layer 702 of the Array substrate 700 includes a plurality of scan lines (or Gate lines) extending in a first direction (e.g., a row direction) and a plurality of Data lines (Data lines) extending in a second direction (e.g., a column direction) formed on the first substrate 701. The plurality of scan lines and the plurality of data lines cross to define an array of subpixel areas. A pixel electrode 704 and a Thin Film Transistor (TFT) are disposed in each sub-pixel region of the array substrate 700, and the pixel electrode 704 may be, for example, an Indium Tin Oxide (ITO) electrode or an Indium Zinc Oxide (IZO) electrode, for example, the pixel electrode 704 is an ITO electrode, and the pixel electrode 704 may be referred to as PITO (Pixel Indium Tin Oxide). For example, the thin film transistor may be a top gate thin film transistor, a bottom gate thin film transistor, or a double gate thin film transistor. For example, the thin film transistor includes, for example, a polysilicon (P-SI) active layer, a Gate insulating layer (Gate Insulator, GI), a Gate electrode, an interlayer dielectric layer (inter-LAYER DIELECTRIC, ILD), a first electrode (e.g., source electrode), and a second electrode (e.g., drain electrode), and the material of the Gate insulating layer and the interlayer dielectric layer may be, for example, one or more of silicon oxide (SiOx), silicon nitride (SiNx), or silicon oxynitride (SiOxNy), for example, the interlayer dielectric layer includes a first sub-interlayer dielectric layer and a second sub-interlayer dielectric layer that are stacked, and the material of the first sub-interlayer dielectric layer and the material of the second sub-interlayer dielectric layer are different. The material of the first sub-interlayer dielectric layer is silicon oxide, and the material of the second sub-interlayer dielectric layer is silicon oxide. The gate electrode of the thin film transistor is connected to the scan line, the first electrode (e.g., source electrode) is connected to the data line, the second electrode (e.g., drain electrode) is connected to the pixel electrode 704 belonging to the same sub-pixel region through the via hole formed in the flat layer 703, for example, specifically connected to the recess 7041 formed at the via hole of the flat layer 703 in the pixel electrode 704.

In a specific example, as shown in fig. 7, the opposite-box substrate 710 may further include a color blocking layer 714 disposed on the second substrate 711, where the color blocking layer 714 may also be referred to as a color film layer or a color filter layer, and the color blocking layer 714 includes a plurality of color blocking units arranged in an array, and each of the sub-pixel regions orthographic projects a corresponding one of the color blocking units. For example, the color resist layer 714 includes a plurality of red color resist units, a plurality of green color resist units, and a plurality of blue color resist units arranged in an array. Illustratively, in order to avoid crosstalk of light emitted from adjacent pixels, the opposite case substrate 710 may further include a Black Matrix layer disposed on the second substrate 711, the Black Matrix layer including a Black Matrix pattern (BM) located at a gap between adjacent color resist cells. For example, the common electrode 712 of the case substrate 710 may be, for example, an Indium Tin Oxide (ITO) electrode or an Indium Zinc Oxide (IZO) electrode, for example, the common electrode 712 is an ITO electrode, and then the common electrode 712 may be referred to as CITO (Common Indium Tin Oxide), and it is understood that, for example, as shown in fig. 7, the thickness of the protruding portion 7121 of the common electrode 712, for example, CITO, is similar to the thickness of the other portion of the common electrode 712. For example, the counter substrate 710 may further be provided with a plurality of spacers for maintaining a Cell thickness (Cell Gap) of the liquid crystal layer 720, and in addition, a plurality of spacers for maintaining a Cell thickness (Cell Gap) of the liquid crystal layer 720 may be provided at a side of the array substrate 700 close to the liquid crystal layer 720.

In the case where the counter substrate 710 as shown in fig. 7 further includes a color resist layer 714, the counter substrate 710 may be referred to as a color film substrate, and furthermore, the color resist layer may be provided not in the counter substrate but in the array substrate, and such a structure is referred to as COA (CF on Array).

In addition, the liquid crystal display panel provided in this embodiment may further include an upper polarizer disposed on a side of the opposite substrate 710 away from the liquid crystal layer 720 and a lower polarizer disposed on a side of the array substrate 700 away from the liquid crystal layer 720, where light transmission axes of the upper polarizer and the lower polarizer are perpendicular to or parallel to each other.

In combination with the above structure, the liquid crystal molecules of the liquid crystal layer 720 are twisted under the driving electric field formed between the pixel electrode 704 and the common electrode 712 to control the polarization direction of the incident light, and the transmittance of the incident light is controlled under the cooperation of two polarizers respectively disposed on the light incident side and the light emergent side of the liquid crystal display panel, so that color display is realized in combination with the color resist layer.

In one possible implementation, as shown in fig. 7, the orthographic projection of the protruding portion 7121 of the common electrode 712 on the first substrate 701 covers the orthographic projection of the recessed portion 7041 of the pixel electrode 704 formed at the via hole of the flat layer 703 on the first substrate 701, or the orthographic projection of the recessed portion 7041 of the pixel electrode 704 formed at the via hole of the flat layer 703 covers the orthographic projection of the protruding portion 7121 of the common electrode 712 on the first substrate 701.

Thus, even in the case where the first alignment film 705 does not completely cover the edge of the concave portion 7041 of the portion of the pixel electrode 704 formed at the via hole of the flat layer 703 due to the contact angle at the time of coating, the liquid crystal twist state at these positions is further similar or even identical to the liquid crystal twist state at the position where the first alignment film 705 completely covers the edge of the concave portion 7041 of the pixel electrode 704 formed at the via hole of the flat layer 703, by enhancing the influence of the electric field force at the position of the convex portion 7121 of the common electrode 712 on the liquid crystal molecules.

In one possible implementation, as shown in fig. 7, the front projection of the protruding portion 7121 of the common electrode 712 on the first substrate 701 overlaps with the front projection of the recessed portion 7041 of the pixel electrode 704 formed at the via hole of the flat layer 703 on the first substrate 701.

In one possible implementation, as shown in fig. 7, the height of the protruding portion 7121 of the common electrode 712 is approximately equal to the depth of the recessed portion 7041 of the pixel electrode 704 formed at the via of the flat layer 703.

Thus, the effect of enhancing the influence of the electric field force at the position of the convex structure 7121 of the common electrode 712 on the liquid crystal molecules can be further ensured by the shape matching design of the convex portion 7121 of the common electrode 712 and the concave portion 7041 of the pixel electrode 704 formed at the via hole of the flat layer 703, so that even in the case where the first alignment film 705 does not completely cover the edge of the concave portion 7041 of the pixel electrode 704 formed at the via hole of the flat layer 703 due to the contact angle at the time of coating, the liquid crystal twist state at these positions is further ensured to be similar to or even the same as that at the position where the first alignment film 705 completely covers the edge of the concave portion 7041 of the pixel electrode 704 formed at the via hole of the flat layer 703.

In a specific example, the height of the protruding portion 7121 of the common electrode 712 is substantially equal to the depth of the recessed portion 7041 of the pixel electrode 704 formed at the via of the flat layer 703, for example, the difference in the height of the protruding portion 7121 of the common electrode 712 and the depth of the recessed portion 7041 of the pixel electrode 704 formed at the via of the flat layer 703 is 1 μm or less.

In one possible implementation, as shown in fig. 7, the counter substrate 710 further includes a color resist layer 714 disposed between the second substrate 711 and the common electrode 712, the color resist layer 714 forming a bump structure 7141 such that the common electrode 712 formed on the color resist layer 714 forms a bump 7121.

In another possible implementation, unlike the embodiment shown in fig. 7, the opposite case substrate 710 further includes a black matrix layer 715 disposed between the second substrate 711 and the common electrode 712, the black matrix layer 715 forming a bump structure such that the common electrode 712 formed on the black matrix layer 715 forms a bump structure 7121, it being understood that the opposite case substrate 710 further includes a color resist layer 714 extending onto the black matrix layer 715, the common electrode 712 is actually formed directly on the color resist layer 714, and the bump structure formed by the black matrix layer 715 such that the color resist layer 714 and the common electrode 712 form bumps, respectively, as shown in fig. 9.

In addition, in the case where the counter substrate includes a black matrix layer and a color resist layer provided between the second substrate and the common electrode and the color resist layer extends onto the black matrix layer, a design in which the black matrix layer and the color resist layer form convex structures, respectively, may also be employed so that the common electrode forms the convex portions based on the accumulation of the two convex structures. In addition, a bump structure of, for example, an organic material (which is provided in a layer different from each of the color resist layer and the black matrix layer) may be provided on the side of the common electrode close to the second substrate so that the common electrode forms a bump when the common electrode is manufactured.

In one possible implementation, the first alignment film 705 and/or the second alignment film 713 are Polyimide (PI) alignment films.

In one possible implementation, the planarization layer 703 is an organic planarization layer.

Another embodiment of the present invention provides a liquid crystal display device, including the liquid crystal display panel provided in the above embodiment.

In addition, the main structure of the liquid crystal display device provided in the embodiment may further include other electronic components such as a frame, a cover glass, a backlight module, and a circuit board.

For example, the longitudinal section of the frame is U-shaped, the liquid crystal display panel, the backlight module, the circuit board and other electronic accessories are arranged in the frame, the backlight module is arranged below the liquid crystal display panel, the circuit board is arranged below the backlight module, and the cover glass is arranged on one side, far away from the backlight module, of the liquid crystal display panel.

The backlight module comprises a light source, a light guide plate and an optical film arranged on the light emitting side of the light guide plate. In this embodiment, the optical film may include a diffusion sheet and/or a brightness enhancement film, etc. The light enhancement film may include a prism film (BEF) or a reflective polarizing film (Dual Brightness ENHANCEMENT FILM, DBEF), and the like, which may be used in combination. The shape of the light guide plate can be wedge-shaped or flat plate-shaped. The light source may be disposed at a side of the light guide plate, in which case the backlight module is a side-in type backlight module. In addition, the light source may be disposed on a side of the light guide plate away from the light emitting side, and in this case, the backlight module is a direct type backlight module. The Light source may be, for example, a Light-Emitting Diode (LED). In the case that the backlight module is a direct type backlight module, tiny blue LEDs arranged in an array manner can be used to make a lamp panel, and the light emitting direction of the lamp panel faces the liquid crystal display panel. The backlight module can further comprise a reflecting sheet, and the reflecting sheet is arranged on one side, far away from the light emitting side, of the light guide plate.

The liquid crystal display device provided in this embodiment may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator, which is not limited in this embodiment.

It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims

1. The utility model provides a liquid crystal display panel, its characterized in that includes the array substrate, with the array substrate is to box the setting to box the base plate and be located the array substrate with to box the liquid crystal layer between the base plate, the array substrate includes first substrate and stacks gradually setting up drive circuit layer, flat layer, pixel electrode and the first alignment film on the first substrate, flat layer has seted up and is used for the pixel electrode with the via hole of drive circuit layer electricity connection, the pixel electrode is in the via hole department forms the depressed part, to box the base plate including the second substrate and stacks gradually setting up common electrode and the second alignment film on the second substrate, wherein, to box the base plate be provided with and make the common electrode forms the protruding structure of bellying, the orthographic projection of bellying on the first substrate with orthographic projection of depressed part on the first substrate exists the overlap region.

2. The liquid crystal display panel of claim 1, wherein an orthographic projection of the protrusion on the first substrate covers an orthographic projection of the recess on the first substrate, or wherein an orthographic projection of the recess on the first substrate covers an orthographic projection of the protrusion on the first substrate.

3. The liquid crystal display panel according to claim 2, wherein an orthographic projection of the convex portion on the first substrate overlaps an orthographic projection of the concave portion on the first substrate.

4. A liquid crystal display panel according to any one of claims 1 to 3, wherein the height of the convex portion is substantially equal to the depth of the concave portion.

5. The liquid crystal display panel according to claim 1, wherein the pair of cell substrates further includes a black matrix layer disposed between the second substrate and the common electrode, the black matrix layer forming the convex structure.

6. The liquid crystal display panel according to claim 1, wherein the pair of cell substrates further includes a color resist layer disposed between the second substrate and the common electrode, the color resist layer forming the convex structure.

7. The liquid crystal display panel according to claim 1, wherein the pixel electrode is an indium tin oxide electrode or an indium zinc oxide electrode, and/or the common electrode is an indium tin oxide electrode or an indium zinc oxide electrode.

8. The liquid crystal display panel according to claim 1, wherein the first alignment film and/or the second alignment film is a polyimide alignment film.

9. The liquid crystal display panel of claim 1, wherein the planarization layer is an organic planarization layer.

10. A liquid crystal display device comprising the liquid crystal display panel according to any one of claims 1 to 9.