Liquid crystal display panel, preparation method thereof and display device

Abstract

The invention discloses a liquid crystal display panel, a preparation method thereof and a display device, and relates to the technical field of display. The liquid crystal display panel comprises a first substrate, a second substrate, a liquid crystal layer and an optical compensation layer, wherein the first substrate and the second substrate are oppositely arranged. Wherein the liquid crystal layer comprises a first alignment film, a second alignment film and a second liquid crystal molecular layer; the first alignment film is configured to enable part of the second liquid crystal molecules close to the first alignment film to generate a first pretilt angle; the second alignment film is configured to enable part of the second liquid crystal molecules close to the second alignment film to generate a second pretilt angle; the direction of the first pretilt angle is opposite to that of the second pretilt angle. The optical compensation layer comprises a third alignment film and a first liquid crystal molecular layer; the third alignment film is configured to enable the first liquid crystal molecules close to the third alignment film to generate a third pretilt angle; the orthographic projection direction of the long axis of the first liquid crystal molecules on the plane where the third alignment film is located is parallel or perpendicular to the orthographic projection direction of the long axis of the second liquid crystal molecules on the plane where the third alignment film is located.

Description

[0001] This application is a divisional application of the Chinese patent application submitted to the State Intellectual Property Office on January 5, 2021, with application number 202180008730.4, and invention name “Liquid Crystal Display Panel, Preparation Method and Display Device”, all contents of which are incorporated by reference in this application.

[0002] This application claims priority to Chinese patent application No. 202020053145.9 filed on January 10, 2020 and No. 202010276034.9 filed on April 9, 2020, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present disclosure 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

[0004] Liquid Crystal Display (LCD) has the characteristics of small size, low power consumption and no radiation, and occupies a dominant position in the current display market. The LCD panel mainly includes a color filter (CF) substrate, an array substrate and a liquid crystal layer arranged between the color filter substrate and the array substrate. Summary of the invention

[0005] On the one hand, a liquid crystal display panel is provided. The liquid crystal display panel comprises: a first substrate and a second substrate arranged oppositely, a liquid crystal layer and an optical compensation layer. The liquid crystal layer is arranged between the first substrate and the second substrate; the liquid crystal layer comprises a first alignment film and a second alignment film arranged oppositely, and a second liquid crystal molecule layer located between the first alignment film and the second alignment film; the first alignment film is configured to anchor a portion of the second liquid crystal molecules close to it in the second liquid crystal molecule layer, so that the portion of the second liquid crystal molecules close to the first alignment film generates a first pretilt angle; the second alignment film is configured to anchor a portion of the second liquid crystal molecules close to it in the second liquid crystal molecule layer, so that the portion of the second liquid crystal molecules close to the second alignment film generates a second pretilt angle; the direction of the first pretilt angle is opposite to the direction of the second pretilt angle. The optical compensation layer is arranged on the side of the first alignment film or the second alignment film away from the second liquid crystal molecule layer; the optical compensation layer includes a third alignment film and a first liquid crystal molecule layer; the third alignment film is configured to anchor the first liquid crystal molecules close to it in the first liquid crystal molecule layer, so that the first liquid crystal molecules close to the third alignment film generate a third pretilt angle; the direction of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is parallel or perpendicular to the direction of the long axis of the second liquid crystal molecule on the plane where the third alignment film is located.

[0006] In some embodiments, when the direction of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is parallel to the direction of the long axis of the second liquid crystal molecule on the plane where the third alignment film is located; the direction of the third pretilt angle is the same as the direction of the first pretilt angle or the direction of the second pretilt angle.

[0007] In some embodiments, when the long axis of the first liquid crystal molecule is parallel to the direction of the orthographic projection of the plane where the third alignment film is located and the long axis of the second liquid crystal molecule is parallel to the direction of the orthographic projection of the plane where the third alignment film is located, the sum of the in-plane delay of the optical compensation layer and the in-plane delay of the liquid crystal layer is equal to a positive integer multiple of the first wavelength; the range of the first wavelength is 535nm±50nm.

[0008] In some embodiments, the in-plane retardation of the optical compensation layer is in the range of 185 nm±25 nm; and the in-plane retardation of the liquid crystal layer is in the range of 350 nm±25 nm.

[0009] In some embodiments, when the long axis of the first liquid crystal molecule is parallel to the direction of the orthographic projection of the plane where the third alignment film is located and the long axis of the second liquid crystal molecule is parallel to the direction of the orthographic projection of the plane where the third alignment film is located, the in-plane delay range of the optical compensation layer is 160nm~240nm, and the in-plane delay range of the liquid crystal layer is 350nm±25nm.

[0010] In some embodiments, when the direction of the orthographic projection of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is perpendicular to the direction of the orthographic projection of the long axis of the second liquid crystal molecule on the plane where the third alignment film is located, the in-plane delay of the optical compensation layer is equal to the in-plane delay of the liquid crystal layer.

[0011] In some embodiments, the in-plane retardation of the liquid crystal layer ranges from 580 nm to 620 nm.

[0012] In some embodiments, the in-plane retardation of the liquid crystal layer is any one of 580 nm, 590 nm, 600 nm, 610 nm, or 620 nm.

[0013] In some embodiments, the third alignment film is disposed on a side of the first base substrate close to the liquid crystal layer.

[0014] Alternatively, in some embodiments, the third alignment film is disposed on a side of the first base substrate away from the liquid crystal layer.

[0015] Alternatively, in some embodiments, the third alignment film is disposed on a side of the second base substrate close to the liquid crystal layer.

[0016] Alternatively, in some embodiments, the third alignment film is disposed on a side of the second base substrate away from the liquid crystal layer.

[0017] In some embodiments, the optical compensation layer further includes a third base substrate, and the third base substrate and the third alignment film are located on the same side or different sides of the first liquid crystal molecule layer.

[0018] In some embodiments, the third alignment film and the second alignment film are disposed on opposite sides of the third base substrate.

[0019] In some embodiments, the optical compensation layer also includes a fourth alignment film, and the fourth alignment film is arranged on a side of the third substrate away from the liquid crystal layer or on a side of the second substrate close to the liquid crystal layer; the fourth alignment film is configured to anchor the portion of the first liquid crystal molecules close to it in the first liquid crystal molecule layer, so that the portion of the first liquid crystal molecules close to the fourth alignment film generates a fourth pretilt angle; the direction of the fourth pretilt angle is opposite to or the same as the direction of the third pretilt angle.

[0020] In some embodiments, the fourth alignment film and the second alignment film are disposed on opposite sides of the third base substrate.

[0021] In some embodiments, the third alignment film is arranged on a side of the second base substrate close to the liquid crystal layer, a planar layer is also provided on a side of the first liquid crystal molecule layer close to the liquid crystal layer, and the second alignment film is arranged on a side of the planar layer close to the liquid crystal layer.

[0022] In some embodiments, an alignment direction of the first alignment film is the same as an alignment direction of the second alignment film.

[0023] In some embodiments, the optical compensation film layer is a +A compensation film layer.

[0024] In some embodiments, the first pretilt angle, the second pretilt angle, and the third pretilt angle are equal in magnitude.

[0025] In some embodiments, the first pretilt angle, the second pretilt angle, and the third pretilt angle are in a range of 2°±2°.

[0026] In some embodiments, the first pretilt angle, the second pretilt angle, and the third pretilt angle are in a range of 2°±1°.

[0027] In some embodiments, a functional film layer is further disposed on the first base substrate; the functional film layer and the optical compensation layer are disposed on opposite sides of the liquid crystal layer; or, the functional film layer and the liquid crystal layer are disposed on opposite sides of the optical compensation layer.

[0028] In some embodiments, the second liquid crystal molecules are negative liquid crystal molecules.

[0029] In another aspect, a display device is provided, comprising: a display panel as described in any one of the above embodiments.

[0030] In another aspect, a method for manufacturing a liquid crystal display panel is provided, comprising: forming a first alignment film on one side of a first base substrate.

[0031] A third alignment film is formed on one side of the second base substrate.

[0032] A first liquid crystal molecule layer is formed on the third alignment film and solidified, so that the first liquid crystal molecules in the first liquid crystal molecule layer have a third pre-tilt angle.

[0033] A second alignment film is formed on the first liquid crystal molecule layer.

[0034] The first substrate substrate formed with the first alignment film and the second substrate substrate formed with the second alignment film are aligning, and a second liquid crystal molecule layer is formed between the first alignment film and the second alignment film; wherein, part of the second liquid crystal molecules in the second liquid crystal molecule layer close to the first alignment film have a first pretilt angle, and part of the second liquid crystal molecules in the second liquid crystal molecule layer close to the second alignment film have a second pretilt angle, and the direction of the first pretilt angle is opposite to the direction of the second pretilt angle; and the direction of the orthographic projection of the long axis of the second liquid crystal molecules on the plane where the third alignment film is located is parallel to or perpendicular to the direction of the orthographic projection of the long axis of the first liquid crystal molecules on the plane where the third alignment film is located.

[0035] In some embodiments, before forming the second alignment film on the first liquid crystal molecule layer, the preparation method further includes: forming a planar layer on the first liquid crystal molecule layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

[0037] Figure 1A A schematic diagram of the structure of a liquid crystal display panel provided in an embodiment of the present disclosure;

[0038] Figure 1B to Figure 1I A schematic diagram of the structure of another liquid crystal display panel provided in an embodiment of the present disclosure;

[0039] Figure 1J A schematic diagram of a first direction and a third direction provided for an embodiment of the present disclosure;

[0040] Figure 2A A three-dimensional diagram of the distribution state of a first liquid crystal molecule and a second liquid crystal molecule provided in an embodiment of the present disclosure;

[0041] Figure 2B A structural diagram of a first alignment film, a second alignment film and a third alignment film provided in an embodiment of the present disclosure;

[0042] Figure 2C A structural diagram of another third alignment film provided in an embodiment of the present disclosure;

[0043] Figure 2D A cross-sectional view of a first alignment film provided in an embodiment of the present disclosure;

[0044] Figure 2E A cross-sectional view of a second alignment film provided in an embodiment of the present disclosure;

[0045] Figure 2F A cross-sectional view of a third alignment film provided in an embodiment of the present disclosure;

[0046] Figure 3A is a schematic diagram of the structure of a liquid crystal display panel in the related art;

[0047] Figure 3B A schematic diagram of the position of the polarization state of light in the Poincare sphere diagram when passing through each layer in a liquid crystal display panel in the related art;

[0048] Figure 4A A position diagram of the polarization state of a light ray when passing through each layer in a liquid crystal display panel in a Poincare sphere diagram provided by an embodiment of the present disclosure;

[0049] Figure 4B A position diagram of another polarization state of light in a Poincare sphere diagram when passing through each layer in a liquid crystal display panel provided in an embodiment of the present disclosure;

[0050] Figure 5 A schematic diagram comparing a polarization angle-brightness curve schematic diagram of a liquid crystal display panel provided in an embodiment of the present disclosure and a schematic diagram of a polarization angle-brightness curve schematic diagram of a liquid crystal display panel in the related art;

[0051] Figure 6A to Figure 6G A schematic diagram of the structure of another liquid crystal display panel provided in an embodiment of the present disclosure;

[0052] Figure 7 A schematic diagram of the structure of another liquid crystal display panel provided in an embodiment of the present disclosure;

[0053] Figure 8A to Figure 8B A schematic diagram of the structure of another liquid crystal display panel provided in an embodiment of the present disclosure;

[0054] Figure 9A to Figure 9B A schematic diagram of the structure of another liquid crystal display panel provided in an embodiment of the present disclosure;

[0055] Fig.10 A schematic flow chart of a method for preparing a liquid crystal display panel provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0056] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0057] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0058] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0059] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0060] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0061] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0062] As used herein, the term "if" is optionally interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that" or "if [a stated condition or event] is detected" are optionally interpreted to mean "upon determining that" or "in response to determining that" or "upon detecting [a stated condition or event]" or "in response to detecting [a stated condition or event]," depending on the context.

[0063] The use of "adapted to" or "configured to" herein is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0064] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0065] As used herein, "same", "opposite", "equal", "parallel", "perpendicular", etc. include the stated values ​​and average values ​​that are within an acceptable deviation range of the particular value, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system), for example, "same" includes absolutely identical and approximately identical, wherein the range of approximately identical is within the acceptable deviation range.

[0066] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0067] The present disclosure provides a display device, which is, for example, a display device using an Advanced Super Dimension Switch (ADS) mode.

[0068] For example, the display device may be any device that displays images, whether in motion (e.g., video) or fixed (e.g., still images), and whether textual or pictorial. The display device may be a variety of display devices, including but not limited to mobile phones, wireless devices, personal data assistants (Portable Android Devices, abbreviated as PADs), handheld or portable computers, GPS (Global Positioning System) receivers / navigators, cameras, MP4 (full name MPEG-4 Part 14) video players, camcorders, game consoles, flat panel displays, computer monitors, car displays (e.g., car dashcams or reversing images, etc.), etc.

[0069] The display device includes, for example, a liquid crystal display panel and a backlight module, wherein the backlight module is used to provide a light source for the liquid crystal display panel to display.

[0070] refer to Figure 1A-Figure 1I The liquid crystal display panel 1 provided by the present disclosure includes: a first base substrate 11 and a second base substrate 12 arranged opposite to each other. The materials of the first base substrate 11 and the second base substrate 12 are, for example, the same, such as glass, but can also be different, which is not limited by the present disclosure.

[0071] The liquid crystal layer 14 is disposed between the first substrate 11 and the second substrate 12. The liquid crystal layer 14 includes a first alignment film 141 and a second alignment film 142 disposed opposite to each other, and a second liquid crystal molecule layer 140 located between the first alignment film 141 and the second alignment film 142. The first alignment film 141 is configured to anchor a portion of the second liquid crystal molecules 140' close to it in the second liquid crystal molecule layer 140, so that the portion of the second liquid crystal molecules 140' close to the first alignment film 141 generates a first pretilt angle α; the second alignment film 142 is configured to anchor a portion of the second liquid crystal molecules 140' close to it in the second liquid crystal molecule layer 140, so that the portion of the second liquid crystal molecules 140' close to the second alignment film 142 generates a second pretilt angle β, wherein the direction of the first pretilt angle α is opposite to the direction of the second pretilt angle β.

[0072] refer to Figure 1A to Figure 1GFor example, part of the second liquid crystal molecules 140′ close to the first alignment film 141 is a layer of second liquid crystal molecules 140′ closest to the first alignment film 141; part of the second liquid crystal molecules 140′ close to the second alignment film 142 is a layer of second liquid crystal molecules 140′ closest to the second alignment film 142.

[0073] As an indication, Figure 1A-1G Only a layer of second liquid crystal molecules 140 ′ in the second liquid crystal molecule layer 140 that is closest to the first alignment film 141 and a layer of second liquid crystal molecules 140 ′ that is closest to the second alignment film 142 are shown.

[0074] The optical compensation layer 15 is disposed on the side of the first alignment film 141 or the second alignment film 142 away from the second liquid crystal molecule layer 140; the optical compensation layer 15 includes a third alignment film 151 and a first liquid crystal molecule layer 150. The third alignment film 151 is configured to anchor the first liquid crystal molecules 150' close to it in the first liquid crystal molecule layer 150, so that the first liquid crystal molecules 150' close to the third alignment film 151 generate a third pretilt angle γ. The direction of the orthographic projection of the long axis of the first liquid crystal molecule 150' on the plane where the third alignment film 151 is located is parallel or perpendicular to the direction of the orthographic projection of the long axis of the second liquid crystal molecule 140' on the plane where the third alignment film 151 is located.

[0075] refer to Figure 1A to Figure 1G , for example, the first liquid crystal molecules 150 ′ close to the third alignment film 151 is a layer of first liquid crystal molecules 150 ′ closest to the third alignment film 151 .

[0076] As an indication, Figure 1A-1I Only a layer of first liquid crystal molecules 150 ′ in the first liquid crystal molecule layer 150 which is closest to the third alignment film 151 is shown.

[0077] It should be noted that Figure 1A-Figure 1I The state of the liquid crystal display panel 1 shown is the state of the liquid crystal display panel 1 when no voltage is applied.

[0078] Liquid crystal molecules can be divided into rod-type liquid crystal molecules and discotic liquid crystal molecules according to their shapes. In rod-type liquid crystal molecules, the long axis direction is the optical axis direction, and in discotic liquid crystal molecules, the short axis direction is the optical axis direction. In some embodiments, the first liquid crystal molecules 150' in the first liquid crystal molecule layer 150 are rod-type liquid crystal molecules. In some embodiments, the second liquid crystal molecules 140' in the second liquid crystal molecule layer 140 are rod-type liquid crystal molecules.

[0079] In some embodiments, the second liquid crystal molecules 140' can be positive liquid crystal molecules or negative liquid crystal molecules. Since the second liquid crystal molecules 140' can make the display panel light transmittance higher when using negative liquid crystal molecules in the L255 state, the liquid crystal display panel 1 using negative liquid crystal molecules has a higher contrast and better display effect.

[0080] The alignment film can put at least some of the liquid crystal molecules in a pre-tilt state, so that the long axis of at least some of the liquid crystal molecules has an angle with the plane where the alignment film is located. In some embodiments of the present disclosure, the pre-tilt angle refers to the acute angle formed by the long axis of the rod-shaped liquid crystal molecules and the alignment direction of the alignment film, and the straight line where the long axis of the rod-shaped liquid crystal molecules with the pre-tilt angle is located intersects with the plane where the alignment film is located.

[0081] The pretilt angle of the second liquid crystal molecule 140′ is the acute angle between the long axis of the second liquid crystal molecule 140′ and the alignment direction of the first alignment film 141 (or the alignment direction of the second alignment film 142) when the liquid crystal display panel 1 is not powered on or the voltage between the pixel electrode and the common electrode is 0.

[0082] The pretilt angle of the first liquid crystal molecule 150 ′ is the acute angle between the long axis of the first liquid crystal molecule 150 ′ and the alignment direction of the third alignment film 151 when the liquid crystal display panel 1 is not powered on or the voltage between the pixel electrode and the common electrode is 0.

[0083] Example, reference Figure 1A to Figure 1I , the alignment direction of the first alignment film 141 is the same as the alignment direction of the second alignment film 142; for example, the alignment direction of the first alignment film 141 and the alignment direction of the second alignment film 142 are both along the first direction, the first direction is, for example, the direction of the X-axis (in the three-dimensional coordinate system), Figure 1A to Figure 1I Schematically, along the left and right direction of the paper.

[0084] Example, reference Figure 1A to Figure 1G The alignment direction of the third alignment film 151 is the same as the alignment directions of the first alignment film 141 and the second alignment film 142. For example, the alignment directions of the first alignment film 141, the second alignment film 142 and the third alignment film 151 are all along the first direction.

[0085] For example, refer to Figure 1H and 1I The alignment direction of the third alignment film 151 is perpendicular to the alignment directions of the first alignment film 141 and the second alignment film 142. For example, the alignment directions of the first alignment film 141 and the second alignment film 142 are along the first direction, and the alignment direction of the third alignment film 151 is along the second direction. The second direction is perpendicular to the first direction. The second direction is, for example, the Y-axis (in the three-dimensional coordinate system). Figure 1H and Fig. 1ISchematically, it is the inside-outside direction of the paper plane perpendicular to the paper plane.

[0086] When the alignment direction of the third alignment film 151 is the same as the alignment directions of the first alignment film 141 and the second alignment film 142, the first liquid crystal molecules 150' and the second liquid crystal molecules 140' are parallel to each other without considering the tilt angle. When considering the tilt angle, the second liquid crystal molecules 140' anchored by the first alignment film 141 generate a first pretilt angle α, the second liquid crystal molecules 140' anchored by the second alignment film 142 generate a second pretilt angle β, and the first liquid crystal molecules 150' anchored by the third alignment film 151 generate a third pretilt angle γ. The first pretilt angle α is the acute angle formed between the straight line where the long axis of the second liquid crystal molecule 140' anchored by the first alignment film 141 is located and the first direction, the second pretilt angle β is the acute angle formed between the straight line where the long axis of the second liquid crystal molecule 140' anchored by the second alignment film 142 is located and the first direction, and the third pretilt angle γ is the acute angle formed between the long axis direction of the first liquid crystal molecule 150' anchored by the third alignment film 151 and the second direction. The orthographic projection of the straight line where the long axis of the first liquid crystal molecule 150' is located on the plane where the third alignment film 151 is located is parallel to the orthographic projection of the straight line where the long axis of the second liquid crystal molecule 140' is located on the plane where the third alignment film 151 is located.

[0087] In the case where the alignment direction of the third alignment film 151 is perpendicular to the alignment directions of the first alignment film 141 and the second alignment film 142, for example, reference Figure 2A , when the tilt angle is not considered, the first liquid crystal molecules 150' and the second liquid crystal molecules 140' are perpendicular to each other, and the second liquid crystal molecules 140' anchored by the first alignment film 141 and the second liquid crystal molecules 140' anchored by the second alignment film 142 are parallel to each other. When the tilt angle is considered, the second liquid crystal molecules 140' anchored by the first alignment film 141 generate a first pretilt angle α, the second liquid crystal molecules 140' anchored by the second alignment film 142 generate a second pretilt angle β, and the first liquid crystal molecules 150' anchored by the third alignment film 151 generate a third pretilt angle γ. The first pretilt angle α is the acute angle formed between the straight line where the long axis of the second liquid crystal molecule 140' anchored by the first alignment film 141 is located and the first direction, the second pretilt angle β is the acute angle formed between the straight line where the long axis of the second liquid crystal molecule 140' anchored by the second alignment film 142 is located and the first direction, and the third pretilt angle γ is the acute angle formed between the long axis direction of the first liquid crystal molecule 150' anchored by the third alignment film 151 and the second direction. The orthographic projection of the straight line where the long axis of the first liquid crystal molecule 150' is located on the plane where the third alignment film 151 is located is perpendicular to the orthographic projection of the straight line where the long axis of the second liquid crystal molecule 140' is located on the plane where the third alignment film 151 is located.

[0088] The alignment film is made of a polymer material, such as polyimide (PI). The alignment directions of the alignment films (including the first alignment film 141, the second alignment film 142 and the third alignment film 151) include a first direction and a second direction, and the pretilt angle is determined by the alignment direction of the alignment film and further through the production process of the alignment film so that an angle can be formed between the long axis direction of the liquid crystal molecules (including the first liquid crystal molecules 150' and the second liquid crystal molecules 140') and the alignment direction of the alignment film.

[0089] Example, reference Figure 2B When the alignment directions of the first alignment film 141, the second alignment film 142 and the third alignment film 151 are along the first direction, the acute angle between the long axis direction of the second liquid crystal molecule 140′ and the first direction is the first pretilt angle α or the second pretilt angle β; the acute angle between the long axis direction of the first liquid crystal molecule 150′ and the first direction is the third pretilt angle γ.

[0090] For example, refer to Figure 2C When the alignment direction of the third alignment film 151 is the second direction, the acute angle between the long axis direction of the first liquid crystal molecule 150 ′ and the second direction is the third pretilt angle γ.

[0091] The first alignment film 141, the second alignment film 142 and the third alignment film 151 can be formed by a Rubbing alignment process, for example. The rubbing direction of the first alignment film 141, the second alignment film 142 and the third alignment film 151 includes information about the alignment direction and pre-tilt angle of the first alignment film 141, the second alignment film 142 and the third alignment film 151, that is, the rubbing direction determines the size and direction of the alignment direction and the pre-tilt angle at the same time.

[0092] Example, reference Figure 2D and Figure 2E As shown, during the Rubbing alignment process, the upper surface (i.e., the side surface close to the second liquid crystal molecules 140') of the alignment film (e.g., the first alignment film 141) forms an angle obliquely upward (i.e., obliquely toward the second liquid crystal molecules 140') relative to its lower surface (i.e., the side surface away from the second liquid crystal molecules 140'). For example, referring to Figure 2D and Figure 2E As shown in FIG. 1 , when rubbing from left to right, along the alignment direction of the alignment film (including the first alignment film 141 and the second alignment film 142), a slope obliquely upward to the right or obliquely downward to the right will be presented from left to right. Although the directions of the first pretilt angle α and the second pretilt angle β are different, in fact, the first alignment film 141 and the second alignment film 142 can be manufactured by the same process. During the manufacturing process, the state of the first alignment film 141 is referenced to FIG. Figure 2D As shown, it is only used as a reference. Figure 1A As shown, since the first alignment film 141 and the second alignment film 142 are arranged relative to each other, the directions of the first pretilt angle α and the second pretilt angle β are different. In fact, during the manufacturing process, the alignment direction of the first alignment film 141 and the rubbing direction of the second alignment film 142 are the same. When the alignment direction of the third alignment film 151 is the same as that of the first alignment film 141 and the second alignment film 142, you can choose to rub from left to right or from right to left; when you choose to rub from left to right, along the alignment direction of the third alignment film 151, from left to right, an angle oblique to the upper right or oblique to the lower right will be presented; when you choose to rub from right to left, along the alignment direction of the third alignment film 151, from right to left, an angle oblique to the upper left will be presented (such as Figure 2F As shown) or an angle oblique to the lower left. Based on this, under the action of the third alignment film 151, the first liquid crystal molecule 150' close to the third alignment film 151 will generate a third pretilt angle γ. Therefore, the rubbing directions of the first alignment film 141, the second alignment film 142 and the third alignment film 151 can respectively determine the alignment directions of the first alignment film 141, the second alignment film 142 and the third alignment film 151 and the pretilt angle direction of the liquid crystal molecules.

[0093] It is worth noting that each alignment direction mentioned in the present disclosure may include two rubbing directions. For example, the alignment direction is the first direction, which may include rubbing from one end along the first direction to the other end (such as Figure 2D ), and may also include rubbing along a path opposite to the path of "from one end to the other end" (e.g. Figure 2F ).

[0094] Based on the above, it can be understood by those skilled in the art that the rubbing direction can determine the direction of the pretilt angle, and when the alignment directions of the alignment films are the same, different rubbing directions can result in different directions of the pretilt angle. For example, when the alignment directions of the alignment films are all along the first direction, the directions of the pretilt angles generated when rubbing from left to right and rubbing from right to left are opposite.

[0095] Based on the above, in some embodiments, reference Figure 1A to Figure 1I , the direction of the first pretilt angle α is opposite to the direction of the second pretilt angle β.

[0096] The direction of the first pretilt angle α is opposite to the direction of the second pretilt angle β, which means that with respect to the same substrate, for example, with respect to the first substrate 11 , the direction of the first pretilt angle α is opposite to the direction of the second pretilt angle β.

[0097] Combination Figure 1A and Figure 1B For examples of the first pretilt angle α, the second pretilt angle β and the third pretilt angle γ, refer to Figure 1J, if a plane rectangular coordinate system X'O'Z' is established with an arbitrary point O' on the straight line, wherein the straight line is located in the established coordinate system X'O'Z', and the O'-Z' direction is the thickness direction of the liquid crystal display panel 1, and the rectangular coordinate system X'O'Z' is divided into 4 quadrants (x'>0, z'>0 in the first quadrant; x'<0, z'>0 in the second quadrant; x'<0, z'<0 in the third quadrant; x'>0, z'<0 in the fourth quadrant), when two straight lines pass through the first quadrant and the third quadrant, the The directions of the two straight lines can be understood to be the same, and therefore, the directions of the two pretilt angles determined by the two straight lines are the same; if both straight lines pass through the second quadrant and the fourth quadrant, the directions of the two straight lines can also be understood to be the same, and therefore, the directions of the two pretilt angles determined by the two straight lines are also the same; if the first straight line passes through the first quadrant and the third quadrant, and the other straight line passes through the second quadrant and the fourth quadrant, the directions of the two straight lines can be understood to be opposite, and therefore, the directions of the two pretilt angles determined by the two straight lines are opposite.

[0098] Based on the above, combined Figure 1A The second liquid crystal molecules 140' anchored by the first alignment film 141 have their long axis located on a straight line passing through the first quadrant and the third quadrant defined above; the second liquid crystal molecules 140' anchored by the second alignment film 142 have their long axis located on a straight line passing through the second quadrant and the fourth quadrant defined above. Therefore, the direction of the first pretilt angle α is opposite to the direction of the second pretilt angle β.

[0099] When the first pretilt angle α and the second pretilt angle β are in opposite directions, the structures and manufacturing processes of the first alignment film 141 and the second alignment film 142 can be completely identical, thereby reducing the difficulty of manufacturing the first alignment film 141 and the second alignment film 142 .

[0100] In some embodiments, the direction of the orthographic projection of the long axis of the first liquid crystal molecule 150 ′ on the plane where the third alignment film 151 is located is parallel to the direction of the orthographic projection of the long axis of the second liquid crystal molecule 140 ′ on the plane where the third alignment film 151 is located.

[0101] The direction of the orthographic projection of the long axis of the first liquid crystal molecule 150' on the plane where the third alignment film 151 is located is parallel to the direction of the orthographic projection of the long axis of the second liquid crystal molecule 140' on the plane where the third alignment film 151 is located, which means that the straight line where the orthographic projection of the long axis of the first liquid crystal molecule 150' on the plane where the third alignment film 151 is located is parallel to or coincides with the straight line where the orthographic projection of the long axis of the second liquid crystal molecule 140' on the plane where the third alignment film 151 is located. At this time, the alignment direction of the third alignment film 151 is the first direction, and the optical compensation layer 15 is used to realize positive compensation of the liquid crystal layer 14.

[0102] refer to Figure 1A to Figure 1GThe direction of the orthographic projection of the long axis of the first liquid crystal molecule 150 ′ on the plane where the third alignment film 151 is located is parallel to the direction of the orthographic projection of the long axis of the second liquid crystal molecule 140 ′ on the plane where the third alignment film 151 is located.

[0103] Based on the above, when the alignment direction of the third alignment film 151 is the same as the alignment directions of the first alignment film 141 and the second alignment film 142, the direction of the third pretilt angle γ is the same as the direction of the first pretilt angle α or the direction of the second pretilt angle β, which means that relative to the same substrate, for example, relative to the first substrate 11, the direction of the third pretilt angle γ is the same as the direction of the first pretilt angle α or the direction of the second pretilt angle β.

[0104] Similarly, combined Figure 1A and Figure 1B For examples of the first pretilt angle α, the second pretilt angle β and the third pretilt angle γ, refer to Figure 1J , if a plane rectangular coordinate system X'O'Z' is established with an arbitrary point O' on the straight line, wherein the straight line is located in the established coordinate system X'O'Z', and the O'-Z' direction is the thickness direction of the liquid crystal display panel 1, and the rectangular coordinate system X'O'Z' is divided into 4 quadrants and 4 quadrants (x'>0, z'>0 in the first quadrant; x'<0, z'>0 in the second quadrant; x'<0, z'<0 in the third quadrant; x'>0, z'<0 in the fourth quadrant), when both straight lines pass through the first quadrant and the third quadrant When the two straight lines pass through the second quadrant and the fourth quadrant, the directions of the two straight lines can be understood as the same, and furthermore, the directions of the two pretilt angles determined by the two straight lines are the same; if the two straight lines both pass through the second quadrant and the fourth quadrant, the directions of the two straight lines can be understood as the same, and furthermore, the directions of the two pretilt angles determined by the two straight lines are also the same; if the first straight line passes through the first quadrant and the third quadrant, and the other straight line passes through the second quadrant and the fourth quadrant, the directions of the two straight lines can be understood as opposite, and furthermore, the directions of the two pretilt angles determined by the two straight lines are opposite.

[0105] In some embodiments, reference Figure 1A When the direction of the third pretilt angle γ is the same as the direction of the second pretilt angle β, the structure and manufacturing process of the third alignment film 151 are completely the same as those of the first alignment film 141 and the second alignment film 142 .

[0106] In some embodiments, reference Figure 1BWhen the direction of the third pretilt angle γ is the same as the direction of the first pretilt angle α, on the basis that the alignment direction is the first direction, the rubbing direction of the third alignment film 151 is opposite to the rubbing direction of the first alignment film 141. For example, the rubbing direction of the third alignment film 151 is from right to left, and the rubbing direction of the first alignment film 141 is from left to right. The manufacturing processes of the two are similar, and the alignment directions are the same, so they are also relatively easy to manufacture.

[0107] In other embodiments, the direction of the orthographic projection of the long axis of the first liquid crystal molecule 150 ′ on the plane where the third alignment film 151 is located is perpendicular to the direction of the orthographic projection of the long axis of the second liquid crystal molecule 140 ′ on the plane where the third alignment film 151 is located.

[0108] The direction of the orthographic projection of the long axis of the first liquid crystal molecule 150' on the plane where the third alignment film 151 is located is perpendicular to the direction of the orthographic projection of the long axis of the second liquid crystal molecule 140' on the plane where the third alignment film 151 is located, which means that the straight line where the orthographic projection of the long axis of the first liquid crystal molecule 150' on the plane where the third alignment film 151 is located is perpendicular to the straight line where the orthographic projection of the long axis of the second liquid crystal molecule 140' on the plane where the third alignment film 151 is located. At this time, the alignment direction of the third alignment film 151 is the second direction, and the optical compensation layer 15 is used to achieve reverse compensation of the liquid crystal layer 14.

[0109] refer to Figure 1H and Fig. 1I The long axis of the first liquid crystal molecule 150' is along the second direction in the direction of the orthographic projection of the plane where the third alignment film 151 is located, and the long axis of the second liquid crystal molecule 140' is along the first direction in the direction of the orthographic projection of the plane where the third alignment film 151 is located, so they are vertical.

[0110] Those skilled in the art can understand that when the long axis of the first liquid crystal molecule 150′ and the long axis of the second liquid crystal molecule 140′ are perpendicular to each other in the direction of the orthographic projection of the plane where the third alignment film 151 is located, the orthographic projection of the straight line where the long axis of the first liquid crystal molecule 150′ and the orthographic projection of the straight line where the long axis of the second liquid crystal molecule 140′ are located in the plane where the third alignment film 151 is located are also perpendicular to each other.

[0111] The relationship between the alignment direction of the third alignment film 151 and the alignment directions of the first alignment film 141 and the second alignment film 142 determines the compensation effect of the optical compensation layer 15. As for how the optical compensation layer 15 realizes normal compensation and reverse compensation, it will be specifically explained below based on the comparison of related technologies.

[0112] Related technologies (reference Figure 3A) has a light leakage problem in the L0 state. The L0 state refers to the state when the LCD panel 1 is in a dark state without voltage applied, and the backlight module provides light source normally. When the LCD panel 1 is in the L0 state, when the LCD panel 1 is subjected to pressure (such as the pressure generated by pressing), the LCD panel 1 will be deformed, wherein the first base substrate 11 in the array substrate and the second base substrate 12 in the color film substrate will be deformed due to the pressure and generate non-uniform stress. The non-uniform stress will change the polarization state of the light in the LCD panel 1, but the changes in the polarization state of the light by the first base substrate 11 and the second base substrate 12 are the same in magnitude and opposite in direction, thereby canceling each other out. For example, for Figure 3A The structure of the liquid crystal display panel 1 is shown in FIG. Figure 3B As shown in the Poincare sphere diagram, along the emitting direction of the light, after the light emitted from the backlight module passes through the first polarizer 18, the polarization state of the light is located at point O, and the light is linearly polarized light; after the light passes through the first base substrate 11, it is affected by the non-uniform stress, and the polarization state is located at point O1, and the light is elliptically polarized light; after the light passes through the liquid crystal layer 14, it is modulated by the liquid crystal molecules, and the polarization state is located at point O2, and the light is elliptically polarized light; after the light passes through the second base substrate 12, it is affected by the non-uniform stress, and the polarization state is located at point O3, and the light is elliptically polarized light, and there is a distance between point O3 and point O, that is, the light incident on the second polarizer 19 is elliptically polarized light rather than linearly polarized light, so that part of the elliptically polarized light is emitted from the second polarizer 19, causing light leakage in the liquid crystal display panel 1.

[0113] In addition, the liquid crystal display panel 1 in the related art also has a polarization problem. Since the liquid crystal molecules are birefringent materials, when light enters the tilted liquid crystal molecules, birefringence (two light components, long axis and short axis) will occur, resulting in differences in △n when observed at different positions, and thus differences in the transmittance of light in different wavelength bands. Here, △n is the refractive index n0 of extraordinary light and the refractive index n of ordinary light. e The difference between ordinary light and extraordinary light is the difference between ordinary light and extraordinary light, where ordinary light is the light that obeys the law of refraction, and extraordinary light is the light that does not obey the law of refraction. For positive liquid crystal molecules, no matter in which direction the light propagates, the refractive index n0 of ordinary light corresponds to the short axis of the liquid crystal molecule, so the refractive index n0 of ordinary light is constant; the refractive index n0 of extraordinary light is constant. e It changes with the direction of light travel, corresponding to the long axis direction of the liquid crystal molecules. Figure 3AWhen the liquid crystal display panel 1 is observed on the left side of the liquid crystal display panel 1, the observed light is emitted in the direction of arrow L, and when the liquid crystal display panel 1 is observed on the right side of the liquid crystal display panel 1, the observed light is emitted in the direction of arrow R; when the liquid crystal display panel 1 is observed on the front side of the liquid crystal display panel 1, the observed light is emitted in the direction of arrow F. When the liquid crystal display panel 1 is observed from different positions, the effective path of the liquid crystal molecules in the liquid crystal layer 14 through which the light passes may be different. For example, when observed from the left side, the effective path of the light through the liquid crystal molecules is S1; when observed from the front side, the effective path of the light through the liquid crystal molecules is S2; when observed from the right side, the effective path of the light through the liquid crystal molecules is S3; wherein, S1>S2>S3. When the effective path of the light through the liquid crystal molecules is different, △n will also be affected and change. Since n0 remains unchanged, n e Corresponding to the long axis of the liquid crystal molecule, △n1<△n2<△n3 exists; wherein △n1 is △n on the left, △n2 is △n on the front, and △n3 is △n on the right. However, the amplitude of the change between S1, S2, and S3 is not the same as the amplitude of the change between △n1, △n2, and △n3. Therefore, for the liquid crystal display panel 1, △n1×S1 on the left ≠△n2×S2≠△n3×S1, so the color of the liquid crystal display panel 1 observed from the left side of the liquid crystal display panel 1 is different from the color of the liquid crystal display panel 1 observed from the right side of the liquid crystal display panel 1. Therefore, the liquid crystal display panel 1 has a color cast problem.

[0114] Therefore, the liquid crystal display panel 1 in the related art has L0 light leakage and color shift problems. However, when the liquid crystal display panel in the present disclosure is in the L0 state, the first substrate 11 and the second substrate 12 will produce non-uniform stress due to deformation, and the change of the polarization state of the light will offset each other, and the optical compensation layer 15 can positively compensate or reversely compensate the change of the polarization state of the light by the liquid crystal layer 14, so that the light emitted from the second substrate 12 is linearly polarized light. When the light emitted from the second substrate 12 is linearly polarized light, even if the liquid crystal display panel 1 is subjected to pressure, the linearly polarized light will not be emitted from the liquid crystal display panel 1. Therefore, the liquid crystal display panel 1 in the present disclosure does not have the problem of L0 light leakage.

[0115] The following is an explanation of the problem that the liquid crystal display panel 1 in the present disclosure does not have L0 light leakage: Since the polarizer in the liquid crystal display panel 1 will also affect the polarization state of the light, in order to facilitate the analysis of the state of the light in the liquid crystal display panel 1, it is necessary to perform analysis when the liquid crystal display panel 1 in the present disclosure also includes a first polarizer arranged on the side of the first base substrate 11 away from the liquid crystal layer 14 and a second polarizer arranged on the side of the second base substrate 12 away from the liquid crystal layer 14.

[0116] When the alignment directions of the first alignment film 141 and the second alignment film 142 are the same as the alignment direction of the third alignment film 151 (i.e., they are all along the first direction), the optical compensation layer 15 can positively compensate for the change of the polarization state of light caused by the liquid crystal layer 14, that is, the optical compensation layer 15 plays a positive compensation role. Figure 4A As shown in the Poincaré sphere diagram, along the emitting direction of the light, the light emitted from the backlight module has a polarization state at point O after passing through the first polarizer, and the light is linearly polarized at this time; after passing through the first base substrate 11, the light is affected by the non-uniform stress, and the polarization state is at point O1, and the light is elliptically polarized at this time; after passing through the liquid crystal layer 14, the light is modulated by the phase delay of the second liquid crystal molecule layer 140, and the polarization state is at point O2, and the light is elliptically polarized at this time; after passing through the optical compensation layer 15, the light is modulated by the phase delay of the first liquid crystal molecule layer 150, and the polarization state is at point O3, and point O3 coincides with point O1, and the light is elliptically polarized at this time; after passing through the second base substrate 12, the light is affected by the non-uniform stress, and the polarization state is at point O, and the light becomes linearly polarized again, so that the light incident on the second polarizer is linearly polarized. In the L0 state, even if the LCD panel 1 is subjected to pressure, linearly polarized light cannot be emitted from the second polarizer, thereby avoiding light leakage when the LCD panel 1 is subjected to force, and the optical compensation layer 15 can play a certain compensation role at different viewing angles.

[0117] When the alignment directions of the first alignment film 141 and the second alignment film 142 are perpendicular to the alignment direction of the third alignment film 151, the optical compensation layer 15 can reversely compensate for the change of the polarization state of light caused by the liquid crystal layer 14, that is, the optical compensation layer 15 plays a reverse compensation role. Figure 4BAs shown in the Poincaré sphere diagram, along the emitting direction of the light, the light emitted from the backlight module has a polarization state at point O after passing through the first polarizer, and the light is linearly polarized at this time; after passing through the first base substrate 11, the light is affected by the non-uniform stress, and the polarization state is at point O1, and the light is elliptically polarized at this time; after passing through the liquid crystal layer 14, the light is modulated by the phase delay of the second liquid crystal molecule layer 140, and the polarization state is at point O2, and the light is elliptically polarized at this time; after passing through the optical compensation layer 15, the light is modulated by the phase delay of the first liquid crystal molecule layer 150, and the polarization state is at point O3, and the light is elliptically polarized, and the polarization state O3 coincides with the polarization state O1; after passing through the second base substrate 12, the light is affected by the non-uniform stress, and the polarization state is at point O, and the light becomes linearly polarized again, so that the light incident on the second polarizer is linearly polarized. In the L0 state, even if the LCD panel 1 is subjected to pressure, linearly polarized light cannot be emitted from the second polarizer, thereby avoiding light leakage when the LCD panel 1 is subjected to force, and the optical compensation layer 15 can play a certain compensation role at different viewing angles.

[0118] exist Figure 4B In the figure, there is a certain distance between polarization state O3 and polarization state O1, which is only to reflect the relationship between polarization state O1 to polarization state O2 and polarization state O2 to polarization state O3. In fact, polarization state O3 and polarization state O1 coincide with each other.

[0119] refer to Figure 4A When the optical compensation layer 15 performs forward compensation, the polarization states O1, O2 and O3 rotate clockwise to form a circle; Figure 4B When the optical compensation layer 15 performs reverse compensation, it rotates counterclockwise from polarization state O1 to polarization state O2, and rotates clockwise from polarization state O2 to polarization state O3, and the rotation amplitude is the same, so that polarization state O3 returns to the position of polarization state O1. Therefore, using the optical compensation layer 15 to compensate for the phase delay of the liquid crystal layer 14 can solve the light leakage problem of the liquid crystal display panel 1 in the L0 state.

[0120] The delay amount of the optical compensation layer 15 can be adjusted by adjusting the relevant parameters (such as refractive index properties and thickness) of the first liquid crystal molecule layer 150 , thereby achieving forward compensation or reverse compensation of the optical compensation layer 15 .

[0121] refer to Figure 4A and Figure 4BThe present disclosure compensates positively or negatively the phase delay of the liquid crystal layer 14 by adding the phase delay generated by the optical compensation layer 15, so that the polarization state of the light emitted from the optical compensation layer 15 can be moved from point O2 to point O3, and point O3 coincides with point O1, thereby solving the problem of light leakage at the positive viewing angle in the L0 state. In addition, the optical compensation layer 15 can play a certain compensation role at different viewing angles. Therefore, when the liquid crystal display panel 1 is observed from the left and right sides, the light leakage brightness of the liquid crystal display panel 1 in the present disclosure is also smaller than that of the liquid crystal display panel 1 in the related art. When the liquid crystal display panel 1 is viewed from the left and right sides, the display effect of the liquid crystal display panel 1 can be measured by color deviation. Therefore, the color deviation degree of the liquid crystal display panel 1 in the present disclosure is lower than that of the liquid crystal display panel 1 in the related art, and the display effect is better. It should be noted that the light leakage in the L0 state may be a phenomenon that occurs when the liquid crystal display panel 1 is viewed from the front viewing angle, and the color shift may be a phenomenon that occurs when the liquid crystal display panel 1 is viewed from the left or right side (side viewing angle) in the L0 state, and the color shift can be perceived by the human eye due to the light leakage. Therefore, when the present disclosure can reduce the brightness of the light leakage of the liquid crystal display panel 1, the brightness corresponding to the color shift can also be reduced, thereby improving the display effect of the liquid crystal display panel 1.

[0122] refer to Figure 1H and Fig. 1I , combined with the above analysis, we can see that Figure 1H and Fig. 1I The structure shown solves the problem of light leakage at the normal viewing angle in the L0 state by using reverse compensation. The optical compensation layer 15 can play a certain compensation role at different viewing angles. Therefore, when the liquid crystal display panel 1 is observed from the left and right sides, the light leakage brightness of the liquid crystal display panel 1 in the present disclosure is also smaller than that of the liquid crystal display panel 1 in the related art. Furthermore, the tilt direction of the second liquid crystal molecules 140′ anchored by the first alignment film 141 is opposite to the tilt direction of the second liquid crystal molecules 140′ anchored by the second alignment film 142, so that for the liquid crystal layer 14, the effective path S1 when observed from the left side of the liquid crystal display panel 1 is equal to the effective path S3 when observed from the right side; and then △n1 on the left side of the liquid crystal display panel 1 is equal to △n3 on the right side, so that △n1×S1=△n3×S3. On this basis, since the alignment direction of the third alignment film 151 is perpendicular to the alignment directions of the first alignment film 141 and the second alignment film 142, and the tilt direction of the first liquid crystal molecules 150′ is the same, it will not affect △n1×S1 on the left side and △n3×S3 on the right side, so the display effects observed from the left and right sides of the liquid crystal display panel 1 are finally the same. Therefore, the liquid crystal display panel 1 in the present disclosure can solve the problem of color deviation.

[0123] Based on the above, regardless of whether the alignment direction of the third alignment film 151 is the same as or perpendicular to the alignment directions of the first alignment film 141 and the second alignment film 142, the optical compensation layer 15 can improve the light leakage phenomenon in the L0 state, and by virtue of the compensation effect of the optical compensation layer 15 at different viewing angles, when observing the liquid crystal display panel 1 from the left and right sides, the light leakage brightness of the liquid crystal display panel 1 in the present disclosure is also smaller than the light leakage brightness of the liquid crystal display panel 1 in the related art. When the light leakage brightness is smaller, the brightness of the liquid crystal display panel 1 is lower. Therefore, when observing, the display difference between different display areas that the human eye can perceive is smaller and less obvious. That is to say, the smaller the light leakage brightness, the lighter the color deviation of the liquid crystal display panel 1 when displaying. Therefore, the color deviation of the liquid crystal display panel 1 in the present disclosure is lower than the color deviation of the liquid crystal display panel 1 in the related art, and the display effect is better.

[0124] In some embodiments, reference Figure 1A to Figure 1I , the first pretilt angle α, the second pretilt angle β and the third pretilt angle γ are equal in magnitude.

[0125] The first pretilt angle α, the second pretilt angle β and the third pretilt angle γ are equal, which means that the pretilt angles are equal in degree, and have nothing to do with the alignment directions of the alignment films (including the first alignment film 141, the second alignment film 142 and the third alignment film 151). Regardless of whether the alignment direction of the third alignment film 151 is the same as or perpendicular to the alignment directions of the first alignment film 141 and the second alignment film 142, the third pretilt angle γ can be set to be equal to or approximately equal to the first pretilt angle α and the second pretilt angle β.

[0126] When the first pretilt angle α, the second pretilt angle β and the third pretilt angle γ are equal or substantially equal, the difficulty of manufacturing each alignment film can be reduced.

[0127] In some embodiments, the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ are in a range of 2°±2°.

[0128] In some other embodiments, the first pretilt angle α, the second pretilt angle β and the third pretilt angle γ are in a range of 2°±1°.

[0129] On this basis, the first pretilt angle α, the second pretilt angle β and the third pretilt angle γ are all 2°, for example.

[0130] In some embodiments, the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ are, for example, all 1° or 3°.

[0131] Since the first pretilt angle α, the second pretilt angle β and the third pretilt angle γ are all small, for example, all are 1°, even if the first pretilt angle α and the second pretilt angle β are in different directions, the long axis direction of the second liquid crystal molecule 140′ close to the first alignment film 141 and the long axis direction of the second liquid crystal molecule 140′ close to the second alignment film 142 are substantially parallel. When the alignment direction of the third alignment film 151 is the same as that of the first alignment film 141, the long axis direction of the first liquid crystal molecule 150′ is substantially the same as that of the second liquid crystal molecule 140′; when the alignment direction of the third alignment film 151 is perpendicular to that of the first alignment film 141, the long axis direction of the first liquid crystal molecule 150′ is substantially perpendicular to that of the second liquid crystal molecule 140′. Among them, the long axis direction of the first liquid crystal molecule 150′ is parallel to the long axis direction of the second liquid crystal molecule 140′, so that the optical compensation layer 15 can achieve positive compensation for the liquid crystal layer 14; the long axis direction of the first liquid crystal molecule 150′ is perpendicular to the long axis direction of the second liquid crystal molecule 140′, so that the optical compensation layer 15 can achieve reverse compensation for the liquid crystal layer 14; both positive compensation and reverse compensation can improve the light leakage problem and color deviation phenomenon of the liquid crystal display panel 1 in the L0 state.

[0132] Based on the above, no matter what the first pretilt angle α and the second pretilt angle β are, the orthographic projection of the long axis of the second liquid crystal molecule 140′ in the plane where the first alignment film 141, the second alignment film 142, or the third alignment film 151 is located is along the first direction. No matter what the third pretilt angle γ is, when the alignment direction of the third alignment film 151 is the same as that of the first alignment film 141 and the second alignment film 142, the orthographic projection of the long axis of the first liquid crystal molecule 150′ in the plane where the first alignment film 141, the second alignment film 142, or the third alignment film 151 is located is also along the first direction; when the alignment direction of the third alignment film 151 is perpendicular to the first alignment film 141 and the second alignment film 142, the orthographic projection of the long axis of the first liquid crystal molecule 150′ in the plane where the first alignment film 141, the second alignment film 142, or the third alignment film 151 is located is along the second direction. Therefore, even if the sizes of the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ are different, the normal operation of the liquid crystal layer 14 and the optical compensation layer 15 can be guaranteed, thereby reducing the process requirements for manufacturing the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ.

[0133] The liquid crystal layer 14 includes a second liquid crystal molecule layer 140, and the refractive index of the second liquid crystal molecule layer 140 satisfies n xLC >n yLC ≈n zLC or xLC >n yLC =n zLC ; where nxLC is the refractive index of the second liquid crystal molecule layer 140 in the X-axis direction, n yLC is the refractive index in the Y-axis direction perpendicular to the X-axis in the plane of the second liquid crystal molecule layer 140, d LC is the thickness of the second liquid crystal molecule layer 140. The X axis is the optical axis of the second liquid crystal molecule in the second liquid crystal molecule layer 140. It should be noted that when there is a small inclination angle (for example, an inclination angle within 5°) between the X axis and the second liquid crystal molecule layer 140, it can also be considered that the X axis is located in the plane of the second liquid crystal molecule layer 140. The in-plane retardation R of the second liquid crystal molecule layer 140 is OLC =(n xLC -n yLC )×d LC The in-plane delay of the second liquid crystal molecule layer 140 can be understood as the actual delay when light passes through the second liquid crystal molecule layer 140 in the normal direction (vertical direction). It can be understood that since the phase delay of the liquid crystal layer 14 is exerted by the second liquid crystal molecule layer 140, the in-plane delay of the second liquid crystal molecule layer 140 can be regarded as the in-plane delay of the liquid crystal layer 14.

[0134] The optical compensation layer 15 includes a first liquid crystal molecule layer 150. The refractive index of the first liquid crystal molecule layer 150 satisfies n x1 >n y1 ≈n z1 or x1 >n y1 =n z1 , where n x1 is the refractive index in the X1 axis direction of the first liquid crystal molecule layer 150, n y1 is the refractive index in the Y1 axis direction perpendicular to the X1 axis in the plane of the first liquid crystal molecule layer 150, n z1 is the refractive index in the thickness direction of the first liquid crystal molecule layer 150. Wherein, the X1 axis is the optical axis of the first liquid crystal molecule layer 150. It should be noted that, when there is a small inclination angle (for example, an inclination angle within 5°) between the X1 axis and the first liquid crystal molecule layer 150, it can also be considered that the X1 axis is located in the plane of the first liquid crystal molecule layer 150. It can be understood that, when there is a small inclination angle between the X1 axis and the first liquid crystal molecule layer 150, n y1 With n z1 There will be some differences. Considering the above situation, n y1 Can be used with n z1 The in-plane retardation R of the first liquid crystal molecule layer 150 is equal to or approximately equal to. O1 =(n x1 -n y1 )×d1, where n x1 is the refractive index in the X1 axis direction within the plane of the first liquid crystal molecule layer 150, ny1 is the refractive index in the Y1 axis direction perpendicular to the X1 axis in the plane of the first liquid crystal molecule layer 150, and d1 is the thickness of the first liquid crystal molecule layer 150. O1 is the in-plane delay of the first liquid crystal molecule layer 150, which can be understood as the actual delay when light passes through the first liquid crystal molecule layer 150 in the normal direction (vertical direction). It can be understood that the phase delay of the optical compensation layer 15 is exerted by the first liquid crystal molecule layer 150, and the in-plane delay of the first liquid crystal molecule layer 150 can be regarded as the in-plane delay of the optical compensation layer 15. On this basis, it can be understood that the optical compensation layer 15 can be regarded as a +A compensation film layer.

[0135] In some embodiments, when the long axis of the first liquid crystal molecule 150' is parallel to the direction of the orthographic projection of the plane where the first alignment film 141 is located and the long axis of the second liquid crystal molecule 140' is parallel to the direction of the orthographic projection of the plane where the third alignment film 151 is located, the sum of the in-plane delay of the optical compensation layer 15 and the in-plane delay of the liquid crystal layer 14 is equal to a positive integer multiple of the first wavelength; the range of the first wavelength is 535nm±50nm. In this structure, the optical compensation layer 15 plays a positive compensation role, so the transmittance of light in the liquid crystal display panel 1 can be controlled by controlling the sum of the in-plane delays of the optical compensation layer 15 and the liquid crystal layer 14.

[0136] By adjusting the refractive index properties of the liquid crystal molecules of the optical compensation layer 15 and / or the liquid crystal layer 14 and the thickness of the optical compensation layer 15 and / or the liquid crystal layer 14, the sum of the in-plane delay of the optical compensation layer 15 and the in-plane delay of the liquid crystal layer 14 can be made equal to a positive integer multiple of the first wavelength.

[0137] For example, the range of the first wavelength is 535nm±50nm, that is, the minimum value of the first wavelength is 485nm, the maximum value is 585nm, and the median value is 535nm. When the sum of the in-plane delay of the optical compensation layer 15 and the in-plane delay of the liquid crystal layer 14 is 535nm, not only the light leakage at the front and side viewing angles is significantly reduced when the liquid crystal display panel 1 is in the L0 state, but also the light leakage presented when the liquid crystal display panel 1 is observed from the side viewing angle is blue. Compared with color deviations such as red, yellow, and green, blue color deviations are more acceptable to people. Therefore, the first wavelength range is set to 535nm±50nm, which further improves the display effect.

[0138] After experimental verification, when the azimuth angle is 45°, the relevant technology is observed at different polarization angles (reference Figure 3A ) in the liquid crystal display panel 1, when the liquid crystal display panel 1 has light leakage, the curve of brightness changing with polarization angle is S1; when observing the use of the present disclosure at different polarization angle positions Figure 1AWhen the liquid crystal display panel 1 has a light leakage phenomenon, the curve of the change of brightness with the polarization angle is S2. Figure 5 It can be clearly seen that when the liquid crystal display panel 1 in the present disclosure has light leakage, the brightness of the leakage is lower. Therefore, the light leakage phenomenon of the liquid crystal display panel 1 in the present disclosure is less obvious than that of the liquid crystal display panel 1 in the related art, that is, the quality of the liquid crystal display panel 1 in the present disclosure is better.

[0139] In some embodiments, when the long axis of the first liquid crystal molecule 150' is parallel to the direction of the orthographic projection of the plane where the first alignment film 141 is located and the long axis of the second liquid crystal molecule 140' is parallel to the direction of the orthographic projection of the plane where the third alignment film 151 is located, the in-plane retardation of the optical compensation layer 15 is in the range of 185nm±25nm; the in-plane retardation of the liquid crystal layer 14 is in the range of 350nm±25nm. The minimum value of the in-plane retardation of the optical compensation layer 15 is, for example, 160nm, the maximum value is, for example, 210nm, and the median value is, for example, 185nm; the minimum value of the in-plane retardation of the liquid crystal layer 14 is, for example, 325nm, the maximum value is, for example, 375nm, and the median value is, for example, 350nm.

[0140] On this basis, in other embodiments, the sum of the in-plane retardation of the optical compensation layer 15 and the in-plane retardation of the liquid crystal layer 14 is equal to a positive integer multiple of the first wavelength; the range of the first wavelength is 535nm±25nm.

[0141] In some embodiments, the sum of the in-plane delay of the optical compensation layer 15 and the in-plane delay of the liquid crystal layer 14 is equal to a positive integer multiple of the first wavelength; the first wavelength is 535nm. In other embodiments, when the long axis of the first liquid crystal molecule 150' is parallel to the direction of the orthographic projection of the plane where the first alignment film 141 is located and the long axis of the second liquid crystal molecule 140' is parallel to the direction of the orthographic projection of the plane where the third alignment film 151 is located, the in-plane delay of the optical compensation layer 15 is in the range of 160nm to 240nm, and the in-plane delay of the liquid crystal layer 14 is in the range of 350nm±25nm. For example, the in-plane delay of the optical compensation layer 15 is any one of 160nm, 180nm, 200nm, 220nm and 240nm.

[0142] When the in-plane delay of the optical compensation layer 15 is in the range of 160nm to 240nm, the forward compensation effect of the optical compensation layer 15 is better. Combined with the appropriate in-plane delay of the liquid crystal layer 14, a variety of combinations of optical compensation layers 15 and liquid crystal layers 14 can be provided, ultimately ensuring that the liquid crystal display panel 1 has a better display effect.

[0143] The above description introduces the requirements for in-plane delay when the optical compensation layer 15 plays a positive compensation role. The following description introduces the requirements for in-plane delay when the optical compensation layer 15 plays a reverse compensation role.

[0144] In some embodiments, when the direction of the orthographic projection of the long axis of the first liquid crystal molecule 150' on the plane where the third alignment film 151 is located is perpendicular to the direction of the orthographic projection of the long axis of the second liquid crystal molecule 140' on the plane where the third alignment film 151 is located, the optical compensation layer 15 will play a reverse compensation role, and at this time, the in-plane retardation of the optical compensation layer 15 is equal to the in-plane retardation of the liquid crystal layer 14. In this structure, since the optical compensation layer 15 plays a reverse compensation role, when the in-plane retardation of the optical compensation layer 15 is equal to the in-plane retardation of the liquid crystal layer 14, the optical compensation layer 15 can completely offset the influence of the liquid crystal layer 14 on the polarization state of light.

[0145] On this basis, in some embodiments, the in-plane retardation of the liquid crystal layer 14 ranges from 580 nm to 620 nm, for example.

[0146] On this basis, the in-plane retardation of the liquid crystal layer 14 is any one of 580 nm, 590 nm, 600 nm, 610 nm, or 620 nm.

[0147] Since the wavelength range of red light is 625nm~740nm; the wavelength range of green light is 492nm~577nm; therefore, the in-plane delay of the liquid crystal layer 14 and the optical compensation layer 15 is close to the wavelength of red light and green light, which makes the liquid crystal layer 14 and the optical compensation layer 15 have a lower transmittance relative to red light and green light, that is, setting the in-plane delay of the liquid crystal layer 14 and the optical compensation layer 15 to 580nm~620nm can relatively reduce the amount of red light and green light transmitted. The wavelength range of blue light is 440nm~475nm, which is quite different from the setting range of the in-plane delay of the liquid crystal layer 14 and the optical compensation layer 15, which makes the transmittance of blue light relatively higher. In this way, when the liquid crystal display panel 1 is displayed in the dark state (L0 state), whether the liquid crystal display panel 1 is observed from the left side or from the right side, the color of the liquid crystal display panel 1 is blue, which enables the liquid crystal display panel 1 to further avoid the problem of color deviation.

[0148] For example, the in-plane retardation of the liquid crystal layer 14 is any one of 580nm, 590nm, 600nm, 610nm or 620nm. When the in-plane retardation of the liquid crystal layer 14 is 600nm, this value is close to the wavelength of red light or green light, so that when the in-plane retardation of the liquid crystal layer 14 is 600nm, the display effect of the liquid crystal display panel 1 is the best.

[0149] Of course, the optical compensation layer 15 may also be a +B compensation layer or other compensation layers that can play the same role as the optical compensation layer 15 in the present application.

[0150] In some embodiments, reference Figure 1F The third alignment film 151 is disposed on a side of the first base substrate 11 close to the liquid crystal layer 14 .

[0151] In some embodiments, reference Figure 1D and Figure 1E The third alignment film 151 is disposed on a side of the first base substrate 11 away from the liquid crystal layer 14 .

[0152] In other embodiments, reference Figure 1A and Figure 1B The third alignment film 151 is disposed on a side of the second base substrate 12 close to the liquid crystal layer 14 .

[0153] In some embodiments, reference Figure 1C The third alignment film 151 is disposed on a side of the second base substrate 12 away from the liquid crystal layer 14 .

[0154] Based on the above, reference Figure 1A to Figure 1G The alignment direction of the third alignment film 151 is the same as the alignment directions of the first alignment film 141 and the second alignment film 142 .

[0155] In other embodiments, reference Figure 1H and Fig. 1I The third alignment film 151 is disposed on a side of the second base substrate 12 close to the liquid crystal layer 14 .

[0156] The alignment direction of the third alignment film 151 is perpendicular to the alignment directions of the first alignment film 141 and the second alignment film 142 .

[0157] The first liquid crystal molecules 150′ in the optical compensation layer 15 are solidified in the optical compensation layer 15. The position and pretilt angle of the first liquid crystal molecules 150′ are fixed and are not affected by the electric field in the liquid crystal display panel 1. Therefore, the position of the optical compensation layer 15 can be changed according to different design requirements, process requirements, etc. to improve the adaptability of the optical compensation layer 15 to different liquid crystal display panels 1.

[0158] In some embodiments, reference Figure 6A to Figure 6C The optical compensation layer 15 further includes a third base substrate 13 . The third base substrate 13 and the third alignment film 151 are located on the same side or different sides of the first liquid crystal molecule layer 150 .

[0159] In some embodiments, the material of the third base substrate 13 is, for example, the same as that of the first base substrate 11 and the second base substrate 12 .

[0160] In some other embodiments, the thickness of the third base substrate 13 is less than or equal to the thickness of the first base substrate 11 and / or the second base substrate 12 .

[0161] refer to Fig. 6A and Figure 6B The third base substrate 13 and the third alignment film 151 are respectively located on both sides of the first liquid crystal molecule layer 150, wherein Fig. 6A In the embodiment, the alignment direction of the third alignment film 151 is the same as the alignment directions of the first alignment film 141 and the second alignment film 142; Figure 6B In the embodiment, the alignment direction of the third alignment film 151 is perpendicular to the alignment directions of the first alignment film 141 and the second alignment film 142 .

[0162] refer to Figure 6C As shown, the third alignment film 151 is located on the third base substrate 13, that is, the third alignment film 151 and the third base substrate 13 are located on the same side of the first liquid crystal molecule layer 150, wherein the alignment direction of the third alignment film 151 is the same as the alignment directions of the first alignment film 141 and the second alignment film 142.

[0163] In other embodiments, the third alignment film 151 is located on the third base substrate 13, that is, the third alignment film 151 and the third base substrate 13 are located on the same side of the first liquid crystal molecule layer 150, wherein the alignment direction of the third alignment film 151 is perpendicular to the alignment directions of the first alignment film 141 and the second alignment film 142.

[0164] After the third base substrate 13 is set in the liquid crystal display panel 1, on the one hand, when the third alignment film 151 and the third base substrate 13 are located on different sides of the first liquid crystal molecule layer 150, the third base substrate 13 has a flattening effect, which is convenient for the subsequent production of other film layers on the side of the third base substrate 13 away from the first liquid crystal molecule layer 150, such as the production of the second alignment film 142; on the other hand, when the third alignment film 151 and the third base substrate 13 are located on the same side, when the third alignment film 151 is produced, it can be produced directly on the third base substrate 13, and then the third base substrate 13 and the second base substrate 12 are matched, and the first liquid crystal molecules 150′ are injected to form the first liquid crystal molecule layer 150, so that the third alignment film 151 can be produced independently, and the process conditions (such as high temperature) in the process of producing the third alignment film 151 will not affect other film layers that have been produced on the first base substrate 11 or the second base substrate 12, such as the thin film transistor layer.

[0165] In other embodiments, reference Figure 6CAs shown, the third alignment film 151 and the second alignment film 142 are disposed on opposite sides of the third base substrate 13. For example, along the thickness direction of the third base substrate 13, the opposite sides of the third base substrate 13 are, for example, the upper surface and the lower surface of the third base substrate 13.

[0166] When the third alignment film 151 and the second alignment film 142 are arranged on opposite sides of the third base substrate 13, it is convenient to directly manufacture the third alignment film 151 and the second alignment film 142 on the third base substrate 13, so that the preparation process of the third alignment film 151 and the second alignment film 142 is relatively independent of the preparation of other structures in the liquid crystal display panel 1 (for example, the second base substrate 12 and the second base substrate 12). Since other film layers often need to be manufactured on the first base substrate 11 and the second base substrate 12, for example, a thin film transistor layer needs to be manufactured on the first base substrate 11, and a filter layer needs to be manufactured on the second base substrate 12, when the preparation process of the third alignment film 151 and the second alignment film 142 is independent of other structures in the liquid crystal display panel 1, on the one hand, the preparation efficiency of the liquid crystal display panel 1 can be improved, and on the other hand, the influence of other structures when manufacturing the third alignment film 151 and the second alignment film 142 can be avoided.

[0167] In some embodiments, reference Fig.6D and Fig. 6E As shown, the optical compensation layer 15 further includes a fourth alignment film 152, which is disposed on a side of the third base substrate 13 away from the liquid crystal layer 14 or on a side of the second base substrate 12 close to the liquid crystal layer 14. The fourth alignment film 152 is configured to anchor a portion of the first liquid crystal molecules 150' close to the first liquid crystal molecule layer 150, so that the portion of the first liquid crystal molecules 150' close to the fourth alignment film 152 generates a fourth pretilt angle θ; the alignment direction of the fourth alignment film 152 is the same as the alignment direction of the third alignment film 151, and the direction of the fourth pretilt angle θ is opposite to or the same as the direction of the third pretilt angle γ.

[0168] refer to Fig.6D As shown, the fourth alignment film 152 is disposed on the side of the third base substrate 13 away from the liquid crystal layer 14, and the third alignment film 151 is disposed on the side of the first base substrate 11 close to the liquid crystal layer 14, that is, the third alignment film 151 and the fourth alignment film 152 are disposed opposite to each other.

[0169] In other embodiments, reference Figure 6E to Figure 6G The third alignment film 151 is disposed on a side of the third base substrate 13 away from the liquid crystal layer 14 , and the fourth alignment film 152 is disposed on a side of the second base substrate 12 close to the liquid crystal layer 14 .

[0170] The alignment direction of the fourth alignment film 152 is the same as that of the third alignment film 151, and the alignment direction of the third alignment film 151 can be the same as that of the first alignment film 141 and the second alignment film 142, in which case the alignment direction of the third alignment film 151 is along the first direction; it can also be perpendicular to the alignment directions of the first alignment film 141 and the second alignment film 142, in which case the alignment direction of the third alignment film 151 is along the second direction. Therefore, the alignment direction of the fourth alignment film 152 includes two structures: along the first direction and along the second direction. Fig. 6E and Fig. 6F An example is given in which the alignment direction of the third alignment film 151 is the same as the alignment directions of the first alignment film 141 and the second alignment film 142 .

[0171] In some embodiments, reference Fig.6D and Fig. 6E When the first liquid crystal molecules 150' in the first liquid crystal molecule layer 150 are a single layer structure, the third alignment film 151 and the fourth alignment film 152 simultaneously anchor the first liquid crystal molecules 150', and the fourth pretilt angle θ is equal to the third pretilt angle γ and has the same direction. In this structure, the fourth alignment film 152 can increase the anchoring force on the first liquid crystal molecules 150', and further fix the position of the first liquid crystal molecules 150' to be constant.

[0172] In other embodiments, reference Fig. 6F When the first liquid crystal molecules 150' of the first liquid crystal molecule layer 150 are multiple layers (at least two layers), the third alignment film 151 can anchor the first liquid crystal molecules 150' close to it, and the fourth alignment film 152 can anchor the first liquid crystal molecules 150' close to it. When the fourth pretilt angle θ is equal to or approximately equal to the third pretilt angle γ, and the direction of the fourth pretilt angle θ is the same as the direction of the third pretilt angle γ, the first liquid crystal molecules 150' in the entire first liquid crystal molecule layer 150 are arranged in the same or approximately the same direction. Figure 6G , when the direction of the fourth pretilt angle θ is opposite to the direction of the third pretilt angle γ, when the liquid crystal display panel 1 is viewed from different viewing angles, the phase difference of the first liquid crystal molecules 150′ at different positions in the first liquid crystal molecule layer 150 can be equal or nearly equal, and the polarization states are the same, thereby further improving the ability of the liquid crystal display panel 1 to improve color deviation. Since the fourth alignment film 152 is used in conjunction with the third alignment film 151, the first liquid crystal molecules 150′ can be a multi-layer structure, so that the optional types of liquid crystal molecules that can be used as the first liquid crystal molecules 150′ are increased, and the production cost of the liquid crystal display panel 1 can be reduced to a certain extent.

[0173] In some embodiments, reference Fig.6DThe fourth alignment film 152 and the second alignment film 142 are disposed on opposite sides of the third base substrate 13 .

[0174] The fourth alignment film 152 and the second alignment film 142 are manufactured on the third substrate, and the manufacturing process is also relatively simple.

[0175] In some embodiments, reference Figure 7 The third alignment film 151 is arranged on the side of the second base substrate 12 close to the liquid crystal layer 14 , a planar layer 16 is also arranged on the side of the first liquid crystal molecule layer 150 close to the liquid crystal layer 14 , and a second alignment film 142 is arranged on the side of the planar layer 16 close to the liquid crystal layer 14 .

[0176] The flat layer 16 is also called the OC (over coat) layer. The material of the flat layer 16 can be organic, such as polyimide. The flat layer 16 mainly plays a flattening role. After the flat layer 16 is set on the side of the first liquid crystal molecule layer 150 away from the second base substrate 12, a relatively flat surface can be provided for the subsequent production of the second alignment film 142, thereby improving the quality of the produced second alignment film 142.

[0177] In some embodiments, the thickness of the first alignment film 141 , the second alignment film 142 , the third alignment film 151 , and the fourth alignment film 152 ranges from 0.01 μm to 10 μm, for example.

[0178] The thickness of each alignment film (including the first alignment film 141 to the fourth alignment film 152 ) within the above thickness range is relatively small, which is conducive to realizing a thinner and lighter liquid crystal display panel 1 .

[0179] In other embodiments, Figure 6D to Figure 6G , the first pretilt angle α, the second pretilt angle β, the third pretilt angle γ and the fourth pretilt angle θ are equal in magnitude.

[0180] In some embodiments, the first pretilt angle α, the second pretilt angle β, the third pretilt angle γ, and the fourth pretilt angle θ are in a range of 2°±2°.

[0181] For example, the first pretilt angle α, the second pretilt angle β, the third pretilt angle γ, and the fourth pretilt angle θ are all equal to 2°.

[0182] As another example, the first pretilt angle α, the second pretilt angle β, the third pretilt angle γ, and the fourth pretilt angle θ are all equal to 4°.

[0183] It should be noted that the first pretilt angle α, the second pretilt angle β, the third pretilt angle γ and the fourth pretilt angle θ do not have a situation where they are equal to 0°. And the above description of the directions of the pretilt angles (the first pretilt angle α to the fourth pretilt angle θ) is based on the relative positions of the pretilt angles in the liquid crystal display panel 1.

[0184] The specific values ​​of the first pretilt angle α, the second pretilt angle β, the third pretilt angle γ and the fourth pretilt angle θ can be selected according to actual needs and process conditions, so as to reduce the difficulty of manufacturing the liquid crystal display panel 1 .

[0185] In some embodiments, the first base substrate 11 is, for example, a substrate in an array substrate, and the second base substrate 12 is, for example, a substrate in a color filter substrate.

[0186] It should be noted that Figure 6A-6G as well as Figure 7 The state of the liquid crystal display panel 1 shown in FIG. 1 is the state of the liquid crystal display panel 1 when no voltage is applied.

[0187] Based on this, in some embodiments, reference Fig. 8A , a functional film layer 17 is also provided on the first base substrate 11; the functional film layer 17 and the optical compensation layer 15 are arranged on opposite sides of the liquid crystal layer 14; or, the functional film layer 17 and the liquid crystal layer 14 are arranged on opposite sides of the optical compensation layer 15. The functional film layer 17 includes, for example, a thin film transistor layer, a pixel electrode layer, a common electrode layer, a data line, and an insulating layer. The specific position and specific structure of each film layer in the functional film layer 17 are determined according to different design requirements, and the present disclosure does not limit this. The positions of the functional film layer 17, the liquid crystal layer 14, and the optical compensation layer 15 can be selected according to requirements while ensuring the normal operation of the liquid crystal display panel 1, so that the position setting of each film layer in the liquid crystal display panel 1 is more flexible.

[0188] Example, reference Figure 8B The thin film transistor layer 170 in the functional film layer 17 is arranged on the side of the first base substrate 11 close to the liquid crystal layer 14, and the thin film transistor layer 170 includes a plurality of thin film transistors, and the source and drain in the thin film transistor are made of the same conductive material and the same layer as the data line 171; on the side of the data line 171 away from the first base substrate 11, a first insulating layer 172, a common electrode layer 173, a second insulating layer 174, a pixel electrode layer 175 and a third insulating layer 176 are stacked in sequence, wherein the pixel electrode layer 175 includes a plurality of strip electrodes spaced apart from each other, and the common electrode layer 173 includes a common electrode with a planar structure, and both the pixel electrode and the common electrode are transparent; the materials of the first insulating layer 172, the second insulating layer 174 and the third insulating layer 176 can be inorganic materials, such as at least one of silicon oxide and silicon nitride, or can be organic materials, such as polyimide, which is not limited in the present disclosure.

[0189] exist Figure 8BIn the structure shown, the pixel electrode layer 175 is closer to the liquid crystal layer 14 than the common electrode layer 173, so the pixel electrode is a stripe structure and the common electrode is a planar structure. In other embodiments, the common electrode layer 173 is closer to the liquid crystal layer 14 than the pixel electrode layer 175, so the common electrode is a stripe structure and the pixel electrode is a planar structure. In still other embodiments, both the pixel electrode and the common electrode are stripe structures.

[0190] On this basis, reference Fig.9A and Fig. 9B The liquid crystal display panel 1 further includes a first polarizer 18 and a second polarizer 19, and the polarization direction of the first polarizer 18 and the polarization direction of the second polarizer 19 are perpendicular to each other or substantially perpendicular to each other.

[0191] For example, the first polarizer 18 is disposed on a side of the first substrate 11 away from the liquid crystal layer 14 , and the second polarizer 19 is disposed on a side of the second substrate 12 away from the liquid crystal layer 14 .

[0192] The first polarizer 18 and the second polarizer 19 are used to change the polarization state of light, wherein the first polarizer 18 is used to make the light emitted from the backlight module become linearly polarized light, and the second polarizer 19 is used to make the light with the same polarization direction appear. It can be understood by those skilled in the art that when the liquid crystal display panel 1 is in the L0 state, the direction of the linearly polarized light incident on the second polarizer 19 is perpendicular to the polarization direction of the second polarizer 19, so the linearly polarized light cannot be emitted from the second polarizer 19.

[0193] refer to Fig.10 The embodiment of the present disclosure further provides a method for preparing a liquid crystal display panel 1, comprising:

[0194] S1 . Form a first alignment film 141 on one side of a first base substrate 11 .

[0195] The material of the first alignment film 141 is, for example, polyimide. For example, polyimide is coated on the first base substrate 11 by coating, and then an alignment rubbing process is performed on the first alignment film 141. The alignment direction of the first alignment film 141 and the size and direction of the first pretilt angle α can be determined by the alignment rubbing process.

[0196] S2 , forming a third alignment film 151 on one side of the second base substrate 12 .

[0197] The alignment direction of the formed third alignment film 151 is the same as or perpendicular to the alignment direction of the first alignment film 141 .

[0198] refer to Figure 1A to Figure 1G, the alignment direction of the third alignment film 151 is the same as the alignment direction of the first alignment film 141, that is, both are along the first direction; Figure 1H to Figure 1I The alignment direction of the third alignment film 151 is perpendicular to the alignment direction of the first alignment film 141 , that is, the alignment direction of the third alignment film 151 is along the second direction.

[0199] S3 , forming a first liquid crystal molecule layer 150 on the third alignment film 151 and curing the layer, so that the first liquid crystal molecules 150 ′ in the first liquid crystal molecule layer 150 have a third pre-tilt angle γ.

[0200] For example, a polymer, such as a photopolymer or a thermal polymer, is added to the first liquid crystal molecules 150 ′, and then the polymer is cured by ultraviolet light, heating, etc., so as to achieve curing of the first liquid crystal molecule layer 150 .

[0201] S4 , forming a second alignment film 142 on the first liquid crystal molecule layer 150 .

[0202] The alignment direction of the formed second alignment film 142 is the same as the alignment direction of the first alignment film 141 .

[0203] Example, reference Figure 1A to Figure 1I , the alignment directions of the first alignment film 141 and the second alignment film 142 are both along the first direction. S5, the first substrate 11 formed with the first alignment film 141 and the second substrate 12 formed with the second alignment film 142 are juxtaposed, and a second liquid crystal molecule layer 140 is formed between the first alignment film 141 and the second alignment film 142; wherein, part of the second liquid crystal molecules 140′ close to the first alignment film 141 in the second liquid crystal molecule layer 140 has a first pretilt angle α, and part of the second liquid crystal molecules 140′ close to the second alignment film 142 in the second liquid crystal molecule layer 140 has a second pretilt angle β; the direction of the first pretilt angle α is opposite to the direction of the second pretilt angle β; and the direction of the orthographic projection of the long axis of the second liquid crystal molecule 140′ on the plane where the third alignment film 151 is located is parallel or perpendicular to the direction of the orthographic projection of the long axis of the first liquid crystal molecule 150′ on the plane where the third alignment film 151 is located.

[0204] When the alignment direction of the third alignment film 151 is the same as the alignment direction of the first alignment film 141 and the second alignment film 142, the direction of the orthographic projection of the long axis of the second liquid crystal molecule 140′ on the plane where the third alignment film 151 is located is parallel to the direction of the orthographic projection of the long axis of the first liquid crystal molecule 150′ on the plane where the third alignment film 151 is located; when the alignment direction of the third alignment film 151 is perpendicular to the alignment directions of the first alignment film 141 and the second alignment film 142, the direction of the orthographic projection of the long axis of the second liquid crystal molecule 140′ on the plane where the third alignment film 151 is located is perpendicular to the direction of the orthographic projection of the long axis of the first liquid crystal molecule 150′ on the plane where the third alignment film 151 is located.

[0205] refer to Figure 1A to Figure 1I Although the alignment directions of the first alignment film 141 and the second alignment film 142 are both along the first direction, the direction of the first pretilt angle α is opposite to the direction of the second pretilt angle β. When the alignment direction of the third alignment film 151 is the same as that of the first alignment film 141 and the second alignment film 142, the direction of the third pretilt angle γ is the same as that of the first pretilt angle α or the second pretilt angle β. When the alignment direction of the third alignment film 151 is perpendicular to that of the first alignment film 141 and the second alignment film 142, the direction of the third pretilt angle γ is perpendicular to the direction of the first pretilt angle α and the direction of the second pretilt angle β.

[0206] The first liquid crystal molecules 150 ′ and the second liquid crystal molecules 140 ′ can be the same type of liquid crystal molecules or different types of liquid crystal molecules, as long as they meet the design requirements of the liquid crystal display panel 1 in the present disclosure, and the present disclosure does not limit this.

[0207] The method for preparing the liquid crystal display panel 1 has the same beneficial effects as the liquid crystal display panel 1 , and thus will not be described in detail.

[0208] In some embodiments, reference Figure 7 Before forming the second alignment film 142 on the first liquid crystal molecule layer 150, the method for preparing the liquid crystal display panel 1 further includes:

[0209] A planar layer 16 is formed on the first liquid crystal molecule layer 150 . The planar layer 16 can make the surface of the first liquid crystal molecule layer 150 close to the liquid crystal layer 14 smoother, which is convenient for preparing the second alignment film 142 on the planar layer 16 later.

[0210] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be thought of by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A liquid crystal display panel, comprising: A first substrate and a second substrate are arranged opposite to each other; A liquid crystal layer is arranged between the first substrate and the second substrate; the liquid crystal layer comprises a first alignment film and a second alignment film arranged opposite to each other, and a second liquid crystal molecule layer located between the first alignment film and the second alignment film; the first alignment film is configured to anchor a portion of second liquid crystal molecules close to the second liquid crystal molecule layer; the second alignment film is configured to anchor a portion of second liquid crystal molecules close to the second liquid crystal molecule layer; an optical compensation layer, arranged on a side of the first alignment film or the second alignment film away from the second liquid crystal molecule layer; the optical compensation layer comprises a third alignment film and a first liquid crystal molecule layer; the third alignment film is configured to anchor the first liquid crystal molecules close to it in the first liquid crystal molecule layer; The extending direction of the orthographic projection of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is parallel to the extending direction of the orthographic projection of the long axis of the second liquid crystal molecule anchored by the first alignment film on the plane where the third alignment film is located; The extending direction of the orthographic projection of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is parallel to the extending direction of the orthographic projection of the long axis of the second liquid crystal molecule anchored by the second alignment film on the plane where the third alignment film is located.

2. The liquid crystal display panel according to claim 1, wherein: The part of the second liquid crystal molecules close to the first alignment film has a first pretilt angle, and the part of the second liquid crystal molecules close to the second alignment film has a second pretilt angle, and the direction of the first pretilt angle is opposite to the direction of the second pretilt angle; The first liquid crystal molecules close to the third alignment film have a third pretilt angle.

3. The liquid crystal display panel according to claim 2, wherein: A direction of the third pretilt angle is the same as a direction of the first pretilt angle or a direction of the second pretilt angle.

4. The liquid crystal display panel according to claim 1, wherein: The sum of the in-plane retardation of the optical compensation layer and the in-plane retardation of the liquid crystal layer is equal to a positive integer multiple of a first wavelength; and the range of the first wavelength is 535nm±50nm.

5. The liquid crystal display panel according to claim 4, wherein: The in-plane retardation of the optical compensation layer is in the range of 185 nm±25 nm; and the in-plane retardation of the liquid crystal layer is in the range of 350 nm±25 nm.

6. The liquid crystal display panel according to claim 4, wherein: The in-plane retardation of the optical compensation layer is in the range of 160 nm to 240 nm, and the in-plane retardation of the liquid crystal layer is in the range of 350 nm±25 nm.

7. The liquid crystal display panel according to claim 1, wherein: The third alignment film is arranged on a side of the first base substrate close to the liquid crystal layer; Alternatively, the third alignment film is arranged on a side of the first substrate away from the liquid crystal layer; Alternatively, the third alignment film is disposed on a side of the second base substrate close to the liquid crystal layer; Alternatively, the third alignment film is arranged on a side of the second base substrate away from the liquid crystal layer.

8. The liquid crystal display panel according to claim 1, wherein: The optical compensation layer further includes a third base substrate, and the third base substrate and the third alignment film are located on the same side or different sides of the first liquid crystal molecule layer.

9. The liquid crystal display panel according to claim 8, wherein: The third alignment film and the second alignment film are disposed on two opposite sides of the third base substrate.

10. The liquid crystal display panel according to claim 8, wherein: The optical compensation layer further comprises a fourth alignment film, which is arranged on a side of the third substrate away from the liquid crystal layer or on a side of the second substrate close to the liquid crystal layer; the fourth alignment film is configured to anchor a portion of the first liquid crystal molecules in the first liquid crystal molecule layer close to the first liquid crystal molecules; The first liquid crystal molecules close to the third alignment film have a third pretilt angle, and part of the first liquid crystal molecules close to the fourth alignment film have a fourth pretilt angle; the direction of the fourth pretilt angle is opposite to or the same as the direction of the third pretilt angle.

11. The liquid crystal display panel according to claim 10, wherein: The fourth alignment film and the second alignment film are disposed on two opposite sides of the third base substrate.

12. The liquid crystal display panel according to claim 1, further comprising a planarization layer, wherein: The third alignment film is arranged on a side of the second base substrate close to the liquid crystal layer, the planar layer is arranged on a side of the first liquid crystal molecule layer close to the liquid crystal layer, and the second alignment film is arranged on a side of the planar layer close to the liquid crystal layer.

13. The liquid crystal display panel according to claim 1, wherein: The alignment direction of the first alignment film is the same as the alignment direction of the second alignment film; or, The alignment direction of the first alignment film, the alignment direction of the second alignment film, and the alignment direction of the third alignment film are all the same.

14. The liquid crystal display panel according to claim 1, wherein: The optical compensation film layer is a +A compensation film layer; and / or The second liquid crystal molecules are negative liquid crystal molecules.

15. The liquid crystal display panel according to claim 2, wherein: The first pretilt angle, the second pretilt angle and the third pretilt angle are equal in magnitude.

16. The liquid crystal display panel according to claim 2, wherein: The first pretilt angle, the second pretilt angle and the third pretilt angle are in a range of 2°±2°; or The first pretilt angle, the second pretilt angle and the third pretilt angle are in a range of 2°±1°.

17. The liquid crystal display panel according to claim 1, wherein: A functional film layer is further provided on the first substrate; the functional film layer and the optical compensation layer are arranged on two opposite sides of the liquid crystal layer; or the functional film layer and the liquid crystal layer are arranged on two opposite sides of the optical compensation layer; Wherein, the functional film layer includes a thin film transistor layer.

18. The liquid crystal display panel according to any one of claims 1 to 17, wherein: The first alignment film, the second alignment film and the third alignment film have the same rubbing direction.

19. A liquid crystal display panel, comprising: A first substrate and a second substrate are arranged opposite to each other; A liquid crystal layer is disposed between the first substrate and the second substrate; the liquid crystal layer comprises a first alignment film and a second alignment film that are disposed opposite to each other, and a second liquid crystal molecule layer located between the first alignment film and the second alignment film; The first alignment film is configured to anchor a portion of second liquid crystal molecules in the second liquid crystal molecule layer close to the first alignment film, and the portion of second liquid crystal molecules close to the first alignment film has a first pretilt angle; The second alignment film is configured to anchor a portion of second liquid crystal molecules in the second liquid crystal molecule layer close to the second liquid crystal molecules, and the portion of second liquid crystal molecules close to the second alignment film has a second pretilt angle; An optical compensation layer is arranged on a side of the first alignment film or the second alignment film away from the second liquid crystal molecule layer; the optical compensation layer includes a third alignment film and the first liquid crystal molecule layer; The third alignment film is configured to anchor the first liquid crystal molecules in the first liquid crystal molecule layer close to it, and the first liquid crystal molecules close to the third alignment film have a third pretilt angle; The extending direction of the orthographic projection of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is parallel to the extending direction of the orthographic projection of the long axis of the second liquid crystal molecule anchored by the first alignment film on the plane where the third alignment film is located; The extending direction of the orthographic projection of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is parallel to the extending direction of the orthographic projection of the long axis of the second liquid crystal molecule anchored by the second alignment film on the plane where the third alignment film is located; The first alignment film, the second alignment film and the third alignment film have the same alignment direction; The optical compensation layer is located on a side of the first alignment film away from the second liquid crystal molecule layer, the first liquid crystal molecule layer is located on a side of the third alignment film away from the second liquid crystal molecule layer, the direction of the first pretilt angle is opposite to the direction of the second pretilt angle, and the direction of the third pretilt angle is the same as the direction of the second pretilt angle, or, The optical compensation layer is located on a side of the first alignment film away from the second liquid crystal molecule layer, the first liquid crystal molecule layer is located on a side of the third alignment film close to the second liquid crystal molecule layer, the direction of the first pretilt angle is opposite to the direction of the second pretilt angle, and the direction of the third pretilt angle is the same as the direction of the first pretilt angle, or, The optical compensation layer is located on a side of the second alignment film away from the second liquid crystal molecule layer; the first liquid crystal molecule layer is located on a side of the third alignment film close to the second liquid crystal molecule layer, the direction of the first pretilt angle is opposite to the direction of the second pretilt angle, and the direction of the third pretilt angle is the same as the direction of the second pretilt angle.

20. A liquid crystal display panel, comprising: A first substrate and a second substrate are arranged opposite to each other; A liquid crystal layer is disposed between the first substrate and the second substrate; the liquid crystal layer comprises a first alignment film and a second alignment film that are disposed opposite to each other, and a second liquid crystal molecule layer located between the first alignment film and the second alignment film; The first alignment film is configured to anchor a portion of second liquid crystal molecules in the second liquid crystal molecule layer close to the first alignment film, and the portion of second liquid crystal molecules close to the first alignment film has a first pretilt angle; The second alignment film is configured to anchor a portion of second liquid crystal molecules in the second liquid crystal molecule layer close to the second liquid crystal molecules, and the portion of second liquid crystal molecules close to the second alignment film has a second pretilt angle; An optical compensation layer is arranged on a side of the first alignment film or the second alignment film away from the second liquid crystal molecule layer; the optical compensation layer includes a third alignment film and the first liquid crystal molecule layer; The third alignment film is configured to anchor the first liquid crystal molecules in the first liquid crystal molecule layer close to it, and the first liquid crystal molecules close to the third alignment film have a third pretilt angle; The extending direction of the orthographic projection of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is parallel to the extending direction of the orthographic projection of the long axis of the second liquid crystal molecule anchored by the first alignment film on the plane where the third alignment film is located; The extending direction of the orthographic projection of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is parallel to the extending direction of the orthographic projection of the long axis of the second liquid crystal molecule anchored by the second alignment film on the plane where the third alignment film is located; The first alignment film, the second alignment film and the third alignment film have the same alignment direction; The optical compensation layer is disposed between the first substrate and the second substrate; The optical compensation layer is located on a side of the first alignment film away from the second liquid crystal molecule layer, the first liquid crystal molecule layer is located on a side of the third alignment film close to the second liquid crystal molecule layer, the direction of the first pretilt angle is opposite to the direction of the second pretilt angle, and the direction of the third pretilt angle is the same as the direction of the first pretilt angle, or, The optical compensation layer is located on a side of the second alignment film away from the second liquid crystal molecule layer; the first liquid crystal molecule layer is located on a side of the third alignment film close to the second liquid crystal molecule layer, the direction of the first pretilt angle is opposite to the direction of the second pretilt angle, and the direction of the third pretilt angle is the same as the direction of the second pretilt angle.

21. A liquid crystal display panel, comprising: A first substrate and a second substrate are arranged opposite to each other; A liquid crystal layer is arranged between the first substrate and the second substrate; the liquid crystal layer comprises a first alignment film and a second alignment film which are arranged opposite to each other, and a second liquid crystal molecule layer located between the first alignment film and the second alignment film; the first alignment film is configured to anchor a portion of second liquid crystal molecules close to it in the second liquid crystal molecule layer, so that a portion of the second liquid crystal molecules close to the first alignment film generates a first pretilt angle; the second alignment film is configured to anchor a portion of second liquid crystal molecules close to it in the second liquid crystal molecule layer, so that a portion of the second liquid crystal molecules close to the second alignment film generates a second pretilt angle; the direction of the first pretilt angle is opposite to the direction of the second pretilt angle; an optical compensation layer, arranged on a side of the first alignment film or the second alignment film away from the second liquid crystal molecule layer; the optical compensation layer comprises a third alignment film and a first liquid crystal molecule layer; the third alignment film is configured to anchor the first liquid crystal molecules close to it in the first liquid crystal molecule layer, so that the first liquid crystal molecules close to the third alignment film generate a third pretilt angle; The extending direction of the orthographic projection of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is perpendicular to the extending direction of the orthographic projection of the long axis of the second liquid crystal molecule anchored by the first alignment film on the plane where the third alignment film is located; The extending direction of the orthographic projection of the long axis of the first liquid crystal molecule on the plane where the third alignment film is located is perpendicular to the extending direction of the orthographic projection of the long axis of the second liquid crystal molecule anchored by the second alignment film on the plane where the third alignment film is located.

22. A display device comprising the liquid crystal display panel according to any one of claims 1 to 21.

23. A method for preparing a liquid crystal display panel, comprising: forming a first alignment film on one side of the first base substrate; forming a third alignment film on one side of the second base substrate; forming a first liquid crystal molecule layer on the third alignment film and curing the first liquid crystal molecule layer so that the third alignment film anchors the first liquid crystal molecules adjacent to the first liquid crystal molecule layer; forming a second alignment film on the first liquid crystal molecule layer; The first base substrate formed with the first alignment film and the second base substrate formed with the second alignment film are assembled into a box, and a second liquid crystal molecule layer is formed between the first alignment film and the second alignment film, so that the first alignment film anchors part of the second liquid crystal molecules close to it in the second liquid crystal molecule layer, and the second alignment film anchors part of the second liquid crystal molecules close to it in the second liquid crystal molecule layer; wherein the extension direction of the long axis of the second liquid crystal molecules anchored by the first alignment film and the second alignment film on the plane where the third alignment film is located is parallel to the extension direction of the long axis of the first liquid crystal molecules on the plane where the third alignment film is located; The first alignment film, the second alignment film and the third alignment film are all formed by an alignment rubbing process, and the rubbing directions of the first alignment film, the second alignment film and the third alignment film are the same.

24. The method for preparing a liquid crystal display panel according to claim 23, wherein: Before forming the second alignment film on the first liquid crystal molecule layer, the preparation method further includes: forming a planar layer on the first liquid crystal molecule layer.

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