Liquid crystal display panel, preparation method thereof and display device

Abstract

The present disclosure provides a liquid crystal display panel and a manufacturing method thereof, and a display device, and relates to the technical field of display, and can improve the color deviation and light leakage of the liquid crystal display panel. The liquid crystal display panel in the present disclosure comprises a first substrate, a second substrate and a liquid crystal layer; the liquid crystal layer comprises a first alignment film, a second alignment film and a second liquid crystal molecule layer; the first alignment film is configured to generate a first pre-tilt angle for the second liquid crystal molecules close to the first alignment film; the second alignment film is configured to generate a second pre-tilt angle for the second liquid crystal molecules close to the second alignment film; the direction of the first pre-tilt angle is opposite or substantially opposite to the direction of the second pre-tilt angle. An optical compensation layer comprises a third alignment film and a first liquid crystal molecule layer; the third alignment film is configured to generate a third pre-tilt angle for the first liquid crystal molecules close to the third alignment film; the direction of the third pre-tilt angle is the same or substantially the same as the direction of the first pre-tilt angle or the direction of the second pre-tilt angle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a liquid crystal display panel, a preparation method thereof and a display device. BACKGROUND

[0002] Liquid crystal display (LCD) has the characteristics of small volume, low power consumption, no radiation, etc., and occupies a dominant position in the current display market. The liquid crystal display panel mainly includes a color filter (CF) substrate, an array substrate, and a liquid crystal layer disposed between the color filter substrate and the array substrate. SUMMARY

[0003] Embodiments of the present application provide a liquid crystal display panel, a preparation method thereof and a display device, which can improve the color deviation and light leakage problems of the liquid crystal display panel.

[0004] To achieve the above-mentioned purpose, embodiments of the present application adopt the following technical solutions:

[0005] In one aspect, a liquid crystal display panel is provided, comprising: a first substrate and a second substrate disposed opposite to each other.

[0006] 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 disposed opposite to each other, and a second liquid crystal molecule layer between the first alignment film and the second alignment film; the first alignment film is configured to anchor a part of the second liquid crystal molecules in the second liquid crystal molecule layer close to the first alignment film, so that the part of the second liquid crystal molecules close to the first alignment film generates a first pre-tilt angle; the second alignment film is configured to anchor a part of the second liquid crystal molecules in the second liquid crystal molecule layer close to the second alignment film, so that the part of the second liquid crystal molecules close to the second alignment film generates a second pre-tilt angle; the direction of the first pre-tilt angle is opposite or substantially opposite to the direction of the second pre-tilt angle.

[0007] An optical compensation layer is disposed 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 comprises a third alignment film and a first liquid crystal molecule layer; the third alignment film is configured to anchor a part of the first liquid crystal molecules in the first liquid crystal molecule layer close to the third alignment film, so that the part of the first liquid crystal molecules close to the third alignment film generates a third pre-tilt angle; the direction of the third pre-tilt angle is the same or substantially the same as the direction of the first pre-tilt angle or the direction of the second pre-tilt angle.

[0008] Optionally, the direction of the normal projection of the long axis of the first liquid crystal molecule in the plane of the first alignment film and the direction of the normal projection of the long axis of the second liquid crystal molecule in the plane of the third alignment film are parallel or substantially parallel.

[0009] Optionally, the alignment direction of the first alignment film, the alignment direction of the second alignment film and the direction of the third alignment film are the same.

[0010] Optionally, the sum of the phase retardation of the optical compensation layer and the phase retardation of the liquid crystal layer is equal to an integer multiple of a first wavelength; the first wavelength ranges from 535 nm ± 50 nm.

[0011] Optionally, the phase retardation of the optical compensation layer ranges from 185 nm ± 25 nm; the phase retardation of the liquid crystal layer ranges from 350 nm ± 25 nm.

[0012] Optionally, the third alignment film is disposed on the side of the first substrate close to the liquid crystal layer.

[0013] Alternatively, the third alignment film is disposed on the side of the first substrate away from the liquid crystal layer.

[0014] Alternatively, the third alignment film is disposed on the side of the second substrate close to the liquid crystal layer.

[0015] Alternatively, the third alignment film is disposed on the side of the second substrate away from the liquid crystal layer.

[0016] Optionally, the optical compensation layer further comprises a third substrate, the third substrate and the third alignment film are located on the same side or different sides of the first liquid crystal molecule layer.

[0017] Optionally, the third alignment film and the second alignment film are disposed on opposite sides of the third substrate.

[0018] Optionally, the optical compensation layer further comprises a fourth alignment film, the fourth alignment film is disposed on the side of the third substrate away from the liquid crystal layer or on the side of the second substrate close to the liquid crystal layer; the fourth alignment film is configured to anchor part of the first liquid crystal molecules close to it in the first liquid crystal molecule layer, so that the part of the first liquid crystal molecules close to the fourth alignment film generates a fourth pre-tilt angle; the direction of the fourth pre-tilt angle is opposite or substantially opposite to the direction of the third pre-tilt angle.

[0019] Optionally, the fourth alignment film and the second alignment film are disposed on opposite sides of the third substrate.

[0020] Optionally, the third alignment film is disposed on the side of the second substrate close to the liquid crystal layer, the side of the first liquid crystal molecule layer close to the liquid crystal layer is further provided with a flat layer, and the second alignment film is disposed on the side of the flat layer close to the liquid crystal layer.

[0021] Optionally, the optical compensation layer is a +A compensation film layer.

[0022] Optionally, the first pre-tilt angle, the second pre-tilt angle and the third pre-tilt angle are equal or approximately equal.

[0023] Optionally, the first pre-tilt angle, the second pre-tilt angle and the third pre-tilt angle are in the range of 2°±2°.

[0024] Optionally, the first pre-tilt angle, the second pre-tilt angle and the third pre-tilt angle are in the range of 2°±1°.

[0025] Optionally, the first substrate further has a functional film layer; the optical compensation layer is arranged on the side of the functional film layer close to the liquid crystal layer.

[0026] In another aspect, a display device is provided, which includes the liquid crystal display panel as described above.

[0027] In another aspect, a preparation method of a liquid crystal display panel is provided, which includes: forming a first alignment film on one side of a first substrate.

[0028] forming a third alignment film on one side of a second substrate.

[0029] forming a first liquid crystal molecule layer on the third alignment film and solidifying, the first liquid crystal molecules having a third pre-tilt angle.

[0030] forming a second alignment film on the first liquid crystal molecule layer.

[0031] aligning the first substrate with the first alignment film formed thereon and the second substrate with the second alignment film formed thereon, and forming a second liquid crystal molecule layer between the first alignment film and the second alignment film; wherein the second liquid crystal molecules close to the first alignment film in the second liquid crystal molecule layer have a first pre-tilt angle, and the second liquid crystal molecules close to the second alignment film in the second liquid crystal molecule layer have a second pre-tilt angle.

[0032] the direction of the first pre-tilt angle is opposite or approximately opposite to the direction of the second pre-tilt angle, and the direction of the third pre-tilt angle is the same or approximately the same as the direction of the first pre-tilt angle or the direction of the second pre-tilt angle.

[0033] Optionally, before forming the second alignment film on the first liquid crystal molecule layer, the preparation method further includes: forming a planarization layer on the first liquid crystal molecule layer.

[0034] The present disclosure provides a liquid crystal display panel, a manufacturing method thereof and a display device. The liquid crystal display panel comprises a liquid crystal layer and an optical compensation layer. Some second liquid crystal molecules in the liquid crystal layer have a first pre-tilt angle a, and some second liquid crystal molecules have a second pre-tilt angle β. The direction of the first pre-tilt angle a is opposite or substantially opposite to the direction of the second pre-tilt angle β. The second liquid crystal molecules in the optical compensation layer have a third pre-tilt angle γ, and the direction of the third pre-tilt angle γ is the same or substantially the same as the direction of the first pre-tilt angle a or the direction of the second pre-tilt angle β. Since the direction of the third pre-tilt angle γ is the same or substantially the same as the direction of the first pre-tilt angle a or the direction of the second pre-tilt angle β, the optical compensation layer can compensate for the change in the polarization state of the light caused by the liquid crystal layer, so that the light emitted from the optical compensation layer is still linearly polarized light, thereby improving the light leakage phenomenon and color deviation phenomenon of the liquid crystal display panel in the L0 state. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0036] Figure 1a A structural schematic diagram of a liquid crystal display panel provided by an embodiment of the present disclosure is shown in the figure.

[0037] Figures 1b-1g A structural schematic diagram of another liquid crystal display panel provided by an embodiment of the present disclosure is shown in the figure.

[0038] Figures 2a-2c A structural schematic diagram of an alignment film provided by an embodiment of the present disclosure is shown in the figure.

[0039] Figure 3a A structural schematic diagram of a liquid crystal display panel in the related art is shown in the figure.

[0040] Figure 3b A schematic diagram of the position of the polarization state of light in the Poincare sphere when the light passes through each layer in the liquid crystal display panel in the related art is shown in the figure.

[0041] Figure 4 A schematic diagram of the position of the polarization state of light in the Poincare sphere when the light passes through each layer in the liquid crystal display panel provided by an embodiment of the present disclosure is shown in the figure.

[0042] Figure 5 A schematic diagram of the polarization angle-luminance curve of a liquid crystal display panel provided by an embodiment of the present disclosure and a comparative schematic diagram of the polarization angle-luminance curve of a liquid crystal display panel in the related art are shown in the figure.

[0043] Figures 6a-6e Another structural schematic diagram of a liquid crystal display panel provided by an embodiment of the present disclosure is shown in FIG. 6.

[0044] Figure 7 Another structural schematic diagram of a liquid crystal display panel provided by an embodiment of the present disclosure is shown in FIG. 6.

[0045] Figures 8a-8b Another structural schematic diagram of a liquid crystal display panel provided by an embodiment of the present disclosure is shown in FIG. 6.

[0046] Figures 9a-9b Another structural schematic diagram of a liquid crystal display panel provided by an embodiment of the present disclosure is shown in FIG. 6.

[0047] Figure 10 A flowchart of a preparation method of a liquid crystal display panel provided by an embodiment of the present disclosure is shown in FIG. 7.

[0048] Reference signs:

[0049] 1 - liquid crystal display panel; 11 - first substrate; 12 - second substrate; 13 - third substrate; 14 - liquid crystal layer; 140 - second liquid crystal molecule layer; 140' - second liquid crystal molecule; 141 - first alignment film; 142 - second alignment film; 15 - optical compensation layer; 150 - first liquid crystal molecule layer; 150' - first liquid crystal molecule; 151 - third alignment film; 152 - fourth alignment film; 16 - planarization layer; 17 - functional film layer; 170 - thin film transistor layer; 171 - data line; 172 - first insulating layer; 173 - common electrode layer; 174 - second insulating layer; 175 - pixel electrode layer; 176 - third insulating layer; 18 - first polarizer; 19 - second polarizer. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0051] Hereinafter, the terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0052] The display device provided by the present disclosure is, for example, a display device using an ADS (Advanced Super Dimension Switch) mode. The display device comprises 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.

[0053] Reference Figures 1a-1g As shown in the drawings, the liquid crystal display panel 1 provided by the present disclosure comprises a first substrate 11 and a second substrate 12 arranged oppositely. The materials of the first substrate 11 and the second substrate 12 are the same, for example, both are glass, of course, they can also be different, and the present disclosure does not limit this.

[0054] A liquid crystal layer 14 is arranged between the first substrate 11 and the second substrate 12. The liquid crystal layer 14 comprises a first alignment film 141 and a second alignment film 142 arranged oppositely, and a second liquid crystal molecule layer 140 between the first alignment film 141 and the second alignment film 142. The first alignment film 141 is configured to anchor a part of the second liquid crystal molecules 140' in the second liquid crystal molecule layer 140 close to it, so that the part of the second liquid crystal molecules 140' close to the first alignment film 141 generates a first pre-tilt angle α; the second alignment film 142 is configured to anchor a part of the second liquid crystal molecules 140' in the second liquid crystal molecule layer 140 close to it, so that the part of the second liquid crystal molecules 140' close to the second alignment film 142 generates a second pre-tilt angle β; the direction of the first pre-tilt angle α is opposite or substantially opposite to the direction of the second pre-tilt angle β.

[0055] Reference Figures 1a-1g As shown in the drawings, the part of the second liquid crystal molecules 140' close to the first alignment film 141 is the layer of the second liquid crystal molecules 140' closest to the first alignment film 141; the part of the second liquid crystal molecules 140' close to the second alignment film 142 is the layer of the second liquid crystal molecules closest to the second alignment film 142.

[0056] As an illustration, Figures 1a-1g Only the second liquid crystal molecules 140' closest to the first alignment film 141 and the second liquid crystal molecules 140' closest to the second alignment film 142 in the second liquid crystal molecule layer 140 are drawn in the drawings.

[0057] 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 comprises 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' in the first liquid crystal molecule layer 150 close to the third alignment film 151, so that the first liquid crystal molecules 150' close to the third alignment film 151 generate a third pre-tilt angle γ. The direction of the third pre-tilt angle γ is the same as or substantially the same as the direction of the first pre-tilt angle α or the direction of the second pre-tilt angle β.

[0058] For example, the first liquid crystal molecules 150' in the first liquid crystal molecule layer 150 closest to the third alignment film 151 form a layer.

[0059] For example, the first liquid crystal molecules 150' in the first liquid crystal molecule layer 150 closest to the third alignment film 151 form a layer. Figures 1a-1g For example, the first liquid crystal molecules 150' in the first liquid crystal molecule layer 150 closest to the third alignment film 151 form a layer.

[0060] For liquid crystal molecules, they can be classified into rod-type liquid crystal molecules and discotic liquid crystal molecules according to their shapes. In the rod-type liquid crystal molecules, the long axis direction is the optical axis direction. In the discotic liquid crystal molecules, the short axis direction is the optical axis direction. In a three-dimensional coordinate system, a material in which at least two of the refractive indexes nx, ny, and nz of the X-axis, Y-axis, and Z-axis directions are not the same is called a birefringent material, and all the liquid crystal molecules are birefringent materials. In some embodiments, the first liquid crystal molecules 150' in the first liquid crystal molecule layer 150 and the second liquid crystal molecules 140' in the second liquid crystal molecule layer 140 are, for example, both rod-type liquid crystal molecules. In other embodiments, the first liquid crystal molecules 150' and the second liquid crystal molecules 140' can also be both positive liquid crystal molecules.

[0061] The pre-tilt angle can make the liquid crystal molecules in a pre-tilt state, which means that the liquid crystal molecules near the alignment film are tilted in a certain direction relative to the plane on which the alignment film is located. In some embodiments of the present disclosure, the pre-tilt angle refers to the angle between the long axis of the rod-type liquid crystal molecule and the plane on which the alignment film is located, and the plane on which the long axis of the rod-type liquid crystal molecule is located intersects the plane on which the alignment film is located. The pre-tilt angles of the first liquid crystal molecules 150' and the second liquid crystal molecules 140' are the states in which the first liquid crystal molecules 150' and the second liquid crystal molecules 140' are present when the liquid crystal display panel 1 is not powered on or the voltage between the pixel electrode and the common electrode is 0.

[0062] The alignment film is made of a polymer material, for example, polyimide (PI). The alignment film can make the liquid crystal molecules generate a pre-tilt angle, which is the acute angle between the long axis of the liquid crystal molecule and the plane on which the alignment film anchoring it is located.

[0063] The direction of the first pretilt angle α is opposite or approximately opposite to the direction of the second pretilt angle β. This means that, relative to the same substrate, such as the first substrate 11, the directions of the first pretilt angle α and the second pretilt angle β are opposite or approximately opposite. In other words, relative to the first substrate 11, the major axis directions of the second liquid crystal molecule 140′ with a pretilt angle equal to the first pretilt angle α and the major axis directions of the second liquid crystal molecule 140′ with a pretilt angle equal to the second pretilt angle β are opposite or approximately opposite. For example, see reference... Figure 1a As shown, relative to the first substrate 11, the direction of the first pretilt angle α is along line A, and the directions of the second pretilt angle β and the third pretilt angle γ are both along line B or approximately along line B. The angle between line A and the first substrate 11 is α, and the angle between line B and the first substrate 11 is b. When the direction of the first pretilt angle α is opposite to the direction of the second pretilt angle β, the included angles α and b are complementary. When the direction of the first pretilt angle α is approximately opposite to the direction of the second pretilt angle β, the sum of included angles α and b is approximately equal to 180°. Approximately equal to 180° means that the sum of included angles α and b is equal to 180° within the allowable error range. For example, the sum of included angles α and b is equal to 179.5°. The allowable error range can be obtained by preset. For example, the error range is ±1°.

[0064] 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. This means that, relative to the same substrate, such as the first substrate 11, the direction of the third pretilt angle γ is the same as or approximately the same as the direction of the first pretilt angle α or the direction of the second pretilt angle β. That is, relative to the first substrate 11, the major axis direction of the first liquid crystal molecule 150′ is the same as the major axis direction of the second liquid crystal molecule 140′ with a pretilt angle equal to the first pretilt angle α or the major axis direction of the second liquid crystal molecule 140′ with a pretilt angle equal to the second pretilt angle β. For example, see reference. Figure 1a As shown, relative to the first substrate 11, the direction of the third pretilt angle γ is along or approximately along the direction of line B, the direction of the first pretilt angle α is along the direction of line A, and the direction of the second pretilt angle β is along the direction of line B; the angle between the direction of line B and the first substrate 11 is b, and the angle between the direction of line A and the first substrate 11 is a. At this time, the direction of the third pretilt angle γ is the same as or approximately the same as the direction of the second pretilt angle β. When the direction of the third pretilt angle γ is the same as the direction of the second pretilt angle β, the size of the third pretilt angle γ is equal to the size of the second pretilt angle β; when the direction of the third pretilt angle γ is approximately the same as the direction of the second pretilt angle β, the difference between the third pretilt angle γ and the second pretilt angle β fluctuates within the allowable error range; the allowable error range can be obtained by preset, for example, the difference between the third pretilt angle γ and the second pretilt angle β fluctuates within the error range of ±0.5°.

[0065] Further, referring to Figure 1b , the direction of the third pre-tilt angle γ is along or substantially along the A straight line direction, the direction of the first pre-tilt angle α is along the A straight line direction, and the direction of the second pre-tilt angle β is along the B straight line direction, with respect to the first substrate 11; the angle between the A straight line direction and the first substrate 11 is a, and the angle between the B straight line direction and the first substrate 11 is b; in this case, the direction of the third pre-tilt angle γ is the same as or substantially the same as the direction of the first pre-tilt angle α. When the direction of the third pre-tilt angle γ is the same as the direction of the first pre-tilt angle α, the magnitude of the third pre-tilt angle γ is equal to the magnitude of the first pre-tilt angle α; when the direction of the third pre-tilt angle γ is substantially the same as the direction of the first pre-tilt angle α, the difference between the third pre-tilt angle γ and the first pre-tilt angle α is within an error allowable range, which can be obtained by pre-setting, for example, the difference between the third pre-tilt angle γ and the first pre-tilt angle α is within an error range of ±0.5°.

[0066] The direction and magnitude of the first pre-tilt angle α are determined by the first alignment film 141, the direction and magnitude of the second pre-tilt angle β are determined by the second alignment film 142, and the direction and magnitude of the third pre-tilt angle γ are determined by the third alignment film 151. The first alignment film 141, the second alignment film 142, and the third alignment film 151 can each be formed by a Rubbing process, for example.

[0067] Referring to Figure 2a and Figure 2b , during the Rubbing process, an upwardly inclined (i.e., inclined toward the second liquid crystal molecules 140') angle is formed on the upper surface (i.e., the side surface close to the second liquid crystal molecules 140') of the alignment film with respect to the lower surface (i.e., the side surface away from the second liquid crystal molecules 140') of the alignment film. For example, referring to Figure 2a and Figure 2b , when Rubbing alignment is performed from left to right, the right end of the alignment direction of the alignment film (including the first alignment film 141 and the second alignment film 142) exhibits an upwardly rightwardly inclined or downwardly rightwardly inclined angle. Although the directions of the first pre-tilt angle α and the second pre-tilt angle β are different, the first alignment film 141 and the second alignment film 142 can actually be manufactured by the same process. During the manufacturing process, the first alignment film 141 is in the state shown in Figure 2a , and only during use, the first alignment film 141 and the second alignment film 142 are arranged oppositely, so that the directions of the first pre-tilt angle α and the second pre-tilt angle β are different, as shown in Figure 1a , the alignment direction of the first alignment film 141 and the alignment direction of the second alignment film 142 can be the same, that is, the structure of the first alignment film 141 and the structure of the second alignment film 142 can be completely the same.

[0068] Referring to Figure 2cAs shown, the left end of the third alignment film 151 in the alignment direction will present an angle obliquely leftward when rubbing alignment is performed from right to left. Based on this, the first liquid crystal molecules 150' close to the third alignment film 151 will generate a third pre-tilt angle γ under the action of the third alignment film 151. Referring to Figure 1b and Figure 2c As shown, the alignment direction of the third alignment film 151 can be opposite or substantially opposite to the alignment direction of the first alignment film 141.

[0069] In other embodiments, as shown in Figure 1a , Figure 2a and Figure 2b As shown, the alignment direction of the third alignment film 151 can be the same as the alignment direction of the second alignment film 142, that is, also the same as the alignment direction of the first alignment film 141. That is, in this structure, the alignment directions of the first alignment film 141, the second alignment film 142 and the third alignment film 151 can all be the same, so that the preparation process of the alignment film (including the first alignment film 141, the second alignment film 142 and the third alignment film 151) is relatively simple.

[0070] The liquid crystal display panel 1 in the related art (see Figure 3a ) has a light leakage problem in the L0 state, where the L0 state refers to a state where the liquid crystal display panel 1 is not powered, the liquid crystal display panel 1 is in a dark state, and the backlight module normally provides a light source. When the liquid crystal display panel 1 is in the L0 state, the liquid crystal display panel 1 will deform when it is subjected to pressure (such as the pressure generated when it is pressed), wherein the first substrate 11 in the array substrate and the second substrate 12 in the color film substrate will deform due to the pressure and further generate non-uniform stress, which will change the polarization state of the light. However, the first substrate 11 and the second substrate 12 change the polarization state of the light by the same amount but in opposite directions, thereby achieving mutual cancellation. For example, referring to the Poincare sphere shown in Figure 3b , along the direction of the light, the light emitted from the backlight module is linearly polarized light at point O after passing through the first polarizer 18; the light is elliptically polarized light at point O1 after passing through the first substrate 11, which is affected by non-uniform stress; the light is elliptically polarized light at point O2 after passing through the liquid crystal layer 14, which is modulated by the liquid crystal molecules; and the light is elliptically polarized light at point O3 after passing through the second substrate 12, which is affected by non-uniform stress. 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, thus causing part of the elliptically polarized light to be emitted from the second polarizer 19, resulting in a light leakage problem of the liquid crystal display panel 1.

[0071] In the L0 state of the liquid crystal display panel disclosed herein, the non-uniform stress generated by the deformation of the first substrate 11 and the second substrate 12 will cancel each other out the change in the polarization state of light. The optical compensation layer 15 can positively compensate the change in the polarization state of light by the liquid crystal layer 14, so that the light emitted from the second substrate 12 is linearly polarized light.

[0072] Since the polarizer in the liquid crystal display panel 1 also affects the polarization state of light, in order to facilitate the analysis of the state of light in the liquid crystal display panel 1, it is necessary to perform the analysis when the liquid crystal display panel 1 in this disclosure also includes a first polarizer disposed on the side of the first substrate 11 away from the liquid crystal layer 14 and a second polarizer disposed on the side of the second substrate 12 away from the liquid crystal layer 14.

[0073] refer to Figure 4 As shown in the Bonga sphere diagram, along the direction of light emission, the light emitted from the backlight module, after passing through the first polarizer, is polarized at point O, and is linearly polarized. After passing through the first substrate 11, the light is affected by non-uniform stress, and is polarized at point O1, and is elliptically polarized. After passing through the liquid crystal layer 14, the light is modulated by the phase delay of the second liquid crystal layer 140, and is polarized at point O2, and is elliptically polarized. After passing through the optical compensation layer 15, the light is modulated by the phase delay of the first liquid crystal layer 150, and is polarized at point O3, which coincides with point O1, and is elliptically polarized. After passing through the second substrate 12, the light is affected by non-uniform stress, and is polarized at point O, and is linearly polarized again. Thus, the light incident on the second polarizer is linearly polarized and cannot exit from the second polarizer. Therefore, light leakage that occurs when the liquid crystal display panel 1 is subjected to stress is avoided, and the optical compensation layer 15 can play a compensating role at different viewing angles.

[0074] For example, the in-plane phase retardation of the first liquid crystal layer 150 can be approximately expressed as R1 = (ne - n0) * d1, where d1 is the thickness of the first liquid crystal layer 150, ne is the refractive index of the first liquid crystal layer 150 for the extraordinary light, and n0 is the refractive index of the first liquid crystal layer 150 for the ordinary light. Therefore, the phase retardation of the compensation layer of the first liquid crystal layer 150 can be adjusted by adjusting the relevant parameters of the first liquid crystal layer 150 (such as refractive index properties and thickness).

[0075] Therefore, refer to Figure 4 As shown, this disclosure positively compensates for the phase delay of the liquid crystal layer 14 by increasing the phase delay generated by the optical compensation layer 15, thereby enabling the polarization state of the light emitted from the optical compensation layer 15 to move from point O2 to point O3.

[0076] The optical compensation layer 15 can compensate at different viewing angles, so the leakage brightness of the liquid crystal display panel 1 in the disclosure is relatively small compared with the leakage brightness of the liquid crystal display panel 1 in the related art when observing the liquid crystal display panel 1 from the left and right sides, and the color cast of the liquid crystal display panel 1 can be used to measure the display effect of the liquid crystal display panel 1 when observing the liquid crystal display panel 1 from the left and right sides, so the color cast degree of the liquid crystal display panel 1 in the disclosure is relatively low compared with the color cast degree of the liquid crystal display panel 1 in the related art, and the display effect is better.

[0077] It should be noted that the leakage in the L0 state can be a phenomenon that occurs when viewing the liquid crystal display panel 1 at a normal viewing angle. The color cast can be a phenomenon that occurs when viewing (side viewing angle) the liquid crystal display panel 1 from the left or right side in the L0 state, and the color cast is also essentially caused by the leakage. Therefore, when the disclosure can reduce the brightness of the leakage of the liquid crystal display panel 1, the corresponding brightness of the color cast can also be reduced, thereby improving the display effect of the liquid crystal display panel 1.

[0078] Optionally, as shown in FIG. 1, the first liquid crystal molecules 150' and the second liquid crystal molecules 140' are arranged in a twisted state. Figures 1a-1g As shown in FIG. 1, the first liquid crystal molecules 150' and the second liquid crystal molecules 140' are arranged in a twisted state.

[0079] In some embodiments, when the alignment direction of the first alignment film 141, the alignment direction of the second alignment film 142, and the direction of the third alignment film 151 are the same, the long axis direction of the first liquid crystal molecules 150' and the long axis direction of the second liquid crystal molecules 140' are parallel, so that the long axis of the first liquid crystal molecules 150' in the normal projection direction of the plane where the first alignment film 141 is located and the long axis of the second liquid crystal molecules 140' in the normal projection plane of the third alignment film 151 are parallel or approximately parallel.

[0080] In some embodiments, when the alignment direction of the first alignment film 141, the alignment direction of the second alignment film 142, and the direction of the third alignment film 151 are the same, the long axis direction of the first liquid crystal molecules 150' and the long axis direction of the second liquid crystal molecules 140' are parallel, so that the long axis of the first liquid crystal molecules 150' in the normal projection direction of the plane where the first alignment film 141 is located and the long axis of the second liquid crystal molecules 140' in the normal projection plane of the third alignment film 151 are parallel or approximately parallel.

[0081] Since the degrees of the first pre-tilt angle α, the second pre-tilt angle β, and the third pre-tilt angle γ are small, for example, all are 1°, even if the directions of the pre-tilt angles are different, the actual long axis direction of the first liquid crystal molecules 150' and the long axis direction of the second liquid crystal molecules 140' are approximately parallel.

[0082] The long axis direction of the first liquid crystal molecules 150' and the long axis direction of the second liquid crystal molecules 140' are parallel or approximately parallel, which can make the optical compensation layer 15 realize positive compensation for the liquid crystal layer 14. Since the phase retardation of the liquid crystal layer 14 can be set to be larger, the positive compensation is beneficial to reduce the thickness of the optical compensation layer 15.

[0083] Optionally, as shown in Figure 1a 、 Figure 1d 、 Figure 1f and Figure 1g , the alignment direction of the first alignment film 141, the alignment direction of the second alignment film 142 and the direction of the third alignment film 151 are the same.

[0084] When the alignment direction of the first alignment film 141, the alignment direction of the second alignment film 142 and the direction of the third alignment film 151 are the same, the preparation process of the liquid crystal display panel 1 is relatively simple.

[0085] Optionally, the sum of the phase retardation of the optical compensation layer 15 and the phase retardation of the liquid crystal layer 14 is equal to a positive integer multiple of a first wavelength; the range of the first wavelength is 535nm±50nm.

[0086] 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 phase retardation of the optical compensation layer 15 and the phase retardation of the liquid crystal layer 14 can be equal to a positive integer multiple of a first wavelength.

[0087] The sum of the phase retardation of the optical compensation layer 15 and the phase retardation of the liquid crystal layer 14 can control the light transmittance of light of different wavelengths. 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 phase retardation of the optical compensation layer 15 and the phase retardation of the liquid crystal layer 14 is 535nm, not only can the leakage of light at the normal viewing angle and the side viewing angle be significantly reduced when the liquid crystal display panel 1 presents the L0 state, but also the leakage of light can be presented in a blue color when the liquid crystal display panel 1 is observed from the side viewing angle. Compared with red, yellow, green and other color cast colors, the color cast blue color is more acceptable to people. Therefore, by setting the range of the first wavelength to 535nm±50nm, the display effect is further improved.

[0088] Optionally, as shown in Figure 1a 、 Figure 1d 、 Figure 1f and Figure 1gAs shown, the alignment direction of the first alignment film 141, the alignment direction of the second alignment film 142, and the direction of the third alignment film 151 are the same, and the sum of the phase retardation of the optical compensation layer 15 and the phase retardation of the liquid crystal layer 14 is equal to a positive integer multiple of a first wavelength; the first wavelength ranges from 535 nm ± 50 nm. In this structure, the first alignment film 141, the second alignment film 142, and the third alignment film 151 are relatively simple to manufacture, and the transmittance of the liquid crystal display panel 1 to light of the first wavelength is relatively low, thereby ensuring the display effect of the liquid crystal display panel 1 and reducing the production cost.

[0089] It has been verified through experiments that, when observing the liquid crystal display panel 1 in the related art (see FIG. 1) at different polarization angle positions under the condition that the azimuth angles are all 45°, the curve of the luminance change with the polarization angle is S1 when the liquid crystal display panel 1 appears light leakage; and when observing the liquid crystal display panel 1 in the present disclosure (see FIG. 1) at different polarization angle positions, the curve of the luminance change with the polarization angle is S2 when the liquid crystal display panel 1 appears light leakage, which is obviously better than S1. Figure 3a Figure 1a Figure 5 It can be seen from the above that, when the liquid crystal display panel 1 in the present disclosure appears light leakage, the luminance of the light leakage is lower, and thus the light leakage 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.

[0090] Optionally, the phase retardation of the optical compensation layer 15 ranges from 185 nm ± 25 nm, and the phase retardation of the liquid crystal layer 14 ranges from 350 nm ± 25 nm. For example, the minimum value of the phase retardation of the optical compensation layer 15 is 160 nm, the maximum value is 210 nm, and the median value is 185 nm; and for example, the minimum value of the phase retardation of the liquid crystal layer 14 is 325 nm, the maximum value is 375 nm, and the median value is 350 nm.

[0091] Optionally, the sum of the phase retardation of the optical compensation layer 15 and the phase retardation of the liquid crystal layer 14 is equal to a positive integer multiple of a first wavelength; the first wavelength ranges from 535 nm ± 25 nm.

[0092] Optionally, the sum of the phase retardation of the optical compensation layer 15 and the phase retardation of the liquid crystal layer 14 is equal to a positive integer multiple of a first wavelength; the first wavelength is 535 nm.

[0093] Optionally, as shown in FIG. 1, the third alignment film 151 is arranged on the side of the first substrate 11 close to the liquid crystal layer 14. Figure 1f

[0094] Optionally, as shown in FIG. 1, the third alignment film 151 is arranged on the side of the first substrate 11 close to the liquid crystal layer 14. ​​​

[0095] Optional, see reference Figure 1d and Figure 1e As shown, the third alignment film 151 is disposed on the side of the first substrate 11 away from the liquid crystal layer 14.

[0096] Example, reference Figure 1d As shown, the alignment direction of the third alignment film 151 is the same as or approximately the same as the alignment direction of the first alignment film 141.

[0097] In other embodiments, reference is made to... Figure 1e As shown, the alignment direction of the third alignment film 151 is opposite to or approximately opposite to the alignment direction of the first alignment film 141.

[0098] Optional, see reference Figure 1a and Figure 1b As shown, the third alignment film 151 is disposed on the side of the second substrate 12 near the liquid crystal layer 14.

[0099] Example, reference Figure 1a As shown, the alignment direction of the third alignment film 151 is the same as or approximately the same as the alignment direction of the second alignment film 142.

[0100] For another example, see reference. Figure 1b As shown, the alignment direction of the third alignment film 151 is opposite to or approximately opposite to the alignment direction of the second alignment film 142.

[0101] Optional, see reference Figure 1c As shown, the third alignment film 151 is disposed on the side of the second substrate 12 away from the liquid crystal layer 14.

[0102] refer to Figure 1c As shown, the alignment direction of the third alignment film 151 is opposite to or approximately opposite to the alignment direction of the second alignment film 142.

[0103] The first liquid crystal molecule 150′ in the optical compensation layer 15 is solidified in the optical compensation layer 15. The position and pretilt angle of the first liquid crystal molecule 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., so as to improve the adaptability of the optical compensation layer 15 to different liquid crystal display panels 1.

[0104] Optional, see reference Figure 6a and Figure 6b As shown, the optical compensation layer 15 also includes a third substrate 13, and the third substrate 13 and the third alignment film 151 are located on the same side or opposite side of the first liquid crystal molecule layer 150.

[0105] In some embodiments, the material of the third substrate 13 is the same as the material of the first substrate 11 and the second substrate 12.

[0106] In some other embodiments, the thickness of the third substrate 13 is less than or equal to the thickness of the first substrate 11 and / or the second substrate 12.

[0107] Reference is made to Fig. 1, which shows a liquid crystal display panel 1 comprising a first substrate 11, a second substrate 12 and a third substrate 13. Figure 6a As shown in Fig. 1, the third substrate 13 and the third alignment film 151 are respectively located on two sides of the first liquid crystal molecule layer 150, wherein the alignment direction of the third alignment film 151 is the same as or substantially the same as the alignment direction of the first alignment film 141 and the second alignment film 142.

[0108] Reference is made to Fig. 1, which shows a liquid crystal display panel 1 comprising a first substrate 11, a second substrate 12 and a third substrate 13. Figure 6b As shown in Fig. 1, the third alignment film 151 is located on the third substrate 13, i.e. the third alignment film 151 and the third 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 opposite to or substantially opposite to the alignment direction of the first alignment film 141 and the second alignment film 142.

[0109] After the third substrate 13 is provided in the liquid crystal display panel 1, on the one hand, when the third alignment film 151 and the third substrate 13 are located on different sides of the first liquid crystal molecule layer 150, the third substrate 13 has a flattening effect, which facilitates the subsequent fabrication of other film layers on the side of the third substrate 13 away from the first liquid crystal molecule layer 150, such as the fabrication of the second alignment film 142; on the other hand, when the third alignment film 151 and the third substrate 13 are located on the same side, the third alignment film 151 can be fabricated directly on the third substrate 13 when the third alignment film 151 is fabricated, and then the third substrate 13 and the second substrate 12 are assembled together, the first liquid crystal molecules 150' are injected, and the first liquid crystal molecule layer 150 is formed, so that the third alignment film 151 can be fabricated independently, and the process conditions (such as high temperature) in the process of fabricating the third alignment film 151 will not affect the other film layers that have been fabricated on the first substrate 11 or the second substrate 12, such as the thin film transistor layer.

[0110] Optionally, as shown in Fig. 1, the third alignment film 151 and the second alignment film 142 are provided on opposite sides of the third substrate 13. Figure 6b

[0111] For example, along the thickness direction of the third substrate 13, the opposite sides of the third substrate 13 are, for example, the upper surface and the lower surface of the third substrate 13.

[0112] In some embodiments, the alignment direction of the third alignment film 151 is opposite to or substantially opposite to the alignment direction of the second alignment film 142, and the direction of the second pre-tilt angle β is the same as or substantially the same as the direction of the third pre-tilt angle γ.​

[0113] When the third alignment film 151 and the second alignment film 142 are arranged on opposite sides of the third substrate 13, the third alignment film 151 and the second alignment film 142 can be directly formed on the third substrate 13, so that the preparation process of the third alignment film 151 and the second alignment film 142 is relatively independent of the formation of other structures in the liquid crystal display panel 1 (for example, the second substrate 12 and the second substrate 12). Since other film layers also need to be formed on the first substrate 11 and the second substrate 12, for example, a thin film transistor layer needs to be formed on the first substrate 11, and a filter layer needs to be formed on the second 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 formation of the third alignment film 151 and the second alignment film 142 can be avoided. Influence on other structures.

[0114] Optionally, as shown in Figure 6c and Figure 6d , the optical compensation layer 15 further comprises a fourth alignment film 152, which is arranged on the side of the third substrate 13 away from the liquid crystal layer 14 or on the side of the second substrate 12 close to the liquid crystal layer 14. The fourth alignment film 152 is configured to anchor the part of the first liquid crystal molecules 150' close to it in the first liquid crystal molecule layer 150, so that the part of the first liquid crystal molecules 150' close to the fourth alignment film 152 generates a fourth pre-tilt angle θ; the direction of the fourth pre-tilt angle θ is opposite or substantially opposite to the direction of the third pre-tilt angle γ.

[0115] As shown in Figure 6c , the fourth alignment film 152 is arranged on the side of the third substrate 13 away from the liquid crystal layer 14, and the third alignment film 151 is arranged on the side of the first substrate 11 close to the liquid crystal layer 14, that is, the third alignment film 151 and the fourth alignment film 152 are arranged opposite to each other.

[0116] In other embodiments, as shown in Figure 6d and Figure 6e , the third alignment film 151 is arranged on the side of the third substrate 13 away from the liquid crystal layer 14, and the fourth alignment film 152 is arranged on the side of the second substrate 12 close to the liquid crystal layer 14.

[0117] The alignment direction of the fourth alignment film 152 is opposite to the alignment direction of the third alignment film 151. In some embodiments, as shown in Figure 6c and Figure 6dAs shown, when the first liquid crystal molecules 150' in the first liquid crystal molecule layer 150 are in a single layer structure, the third alignment film 151 and the fourth alignment film 152 simultaneously anchor the single layer of first liquid crystal molecules 150', the fourth pre-tilt angle θ is equal in size and opposite in direction to the third pre-tilt angle γ. In this structure, the fourth alignment film 152 can increase the anchoring force on the first liquid crystal molecules 150', further fixing the position of the first liquid crystal molecules 150' to be constant.

[0118] In some other embodiments, referring to Figure 6e As shown, when the first liquid crystal molecules 150' in the first liquid crystal molecule layer 150 are in a multi-layer (at least two layers) structure, the third alignment film 151 can anchor the first liquid crystal molecules 150' close to it, the fourth alignment film 152 can anchor the first liquid crystal molecules 150' close to it, the fourth pre-tilt angle θ is equal or approximately equal in size to the third pre-tilt angle γ, and the fourth pre-tilt angle θ is opposite or approximately opposite in direction to the third pre-tilt angle γ, so that 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. The fourth alignment film 152 is used in combination with the third alignment film 151, so that the first liquid crystal molecules 150' can be in a multi-layer structure, the available 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 some extent.

[0119] Optionally, referring to Figure 6c As shown, the fourth alignment film 152 and the second alignment film 142 are arranged on opposite sides of the third substrate 13.

[0120] The fourth alignment film 152 and the second alignment film 142 are made on the third substrate, and the manufacturing process is relatively simple.

[0121] Optionally, referring to Figure 7 As shown, the third alignment film 151 is arranged on the side of the second substrate 12 close to the liquid crystal layer 14, the side of the first liquid crystal molecule layer 150 close to the liquid crystal layer 14 is further provided with a planarization layer 16, and the second alignment film 142 is arranged on the side of the planarization layer 16 close to the liquid crystal layer 14.

[0122] The planarization layer 16 is also called an OC (over coat) layer, and the material of the planarization layer 16 can be an organic substance, such as polyimide. The planarization layer 16 mainly plays a planarization role. After the planarization layer 16 is arranged on the side of the first liquid crystal molecule layer 150 away from the second substrate 12, a relatively flat surface can be provided for subsequent manufacturing of the second alignment film 142, thereby improving the quality of the manufactured second alignment film 142.

[0123] Optionally, 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.

[0124] The thickness of each alignment film (including the first alignment film to the fourth alignment film) in the above thickness range is small, which is conducive to the thinning of the liquid crystal display panel 1.

[0125] Optionally, the first pre-tilt angle α, the second pre-tilt angle β and the third pre-tilt angle γ are equal or substantially equal.

[0126] The first pre-tilt angle α, the second pre-tilt angle β and the third pre-tilt angle γ being equal or substantially equal means that the degrees of the pre-tilt angles are equal or substantially equal, regardless of their directions.

[0127] When the first pre-tilt angle α, the second pre-tilt angle β and the third pre-tilt angle γ are equal or substantially equal, the manufacturing difficulty of each alignment film can be reduced.

[0128] In other embodiments, as shown in FIG. 1C, the first pre-tilt angle α, the second pre-tilt angle β, the third pre-tilt angle γ and the fourth pre-tilt angle θ are equal or substantially equal. Figure 6c

[0129] Optionally, the first pre-tilt angle α, the second pre-tilt angle β, the third pre-tilt angle γ and the fourth pre-tilt angle θ range from 2° to 2°.

[0130] It should be noted that the first pre-tilt angle α, the second pre-tilt angle β, the third pre-tilt angle γ and the fourth pre-tilt angle θ are not equal to 0°.

[0131] For example, the first pre-tilt angle α, the second pre-tilt angle β, the third pre-tilt angle γ and the fourth pre-tilt angle θ are all equal to 2°.

[0132] For another example, the first pre-tilt angle α, the second pre-tilt angle β, the third pre-tilt angle γ and the fourth pre-tilt angle θ are all equal to 4°.

[0133] The specific values of the first pre-tilt angle α, the second pre-tilt angle β, the third pre-tilt angle γ and the fourth pre-tilt angle θ can be selected according to actual needs and process conditions, so as to reduce the manufacturing difficulty of the liquid crystal display panel 1.

[0134] In some embodiments, the first substrate 11 is a substrate in an array substrate, and the second substrate 12 is a substrate in a color filter substrate, for example.

[0135] Based on this, as shown in FIG. 1A, the first substrate 11 is provided with a functional film layer 17; and the optical compensation layer 15 is arranged on the side of the functional film layer 17 close to the liquid crystal layer 14. Figure 8a

[0136] ​​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, and the specific positions and specific structures of the film layers in the functional film layer 17 are determined according to different design requirements, which are not limited in the present disclosure.

[0137] For example, referring to FIG. 1, the functional film layer 17 includes a thin film transistor layer 170, a pixel electrode layer 175, a common electrode layer 173, a first insulating layer 172, a second insulating layer 174, and a third insulating layer 176. Figure 8b As shown in FIG. 1, the thin film transistor layer 170 in the functional film layer 17 is arranged on the side of the first 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 of the thin film transistors are made of the same conductive material in the same layer as the data line 171; on the side of the data line 171 away from the first substrate 11, the first insulating layer 172, the common electrode layer 173, the second insulating layer 174, the pixel electrode layer 175, and the third insulating layer 176 are sequentially stacked, wherein the pixel electrode layer 175 includes a plurality of strip-shaped electrodes spaced from each other, the common electrode layer 173 includes a common electrode in a planar structure, and the pixel electrode and the common electrode are both 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 organic materials such as polyimide, which are not limited in the present disclosure.

[0138] In some embodiments, referring to FIG. 1, the liquid crystal display panel 1 further includes a backlight module 2 arranged on the side of the first substrate 11 away from the liquid crystal layer 14. Figure 8b In the structure shown in FIG. 1, the pixel electrode layer 175 is closer to the liquid crystal layer 14 than the common electrode layer 173, so the pixel electrode is in a strip-shaped structure and the common electrode is in 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 in a strip-shaped structure and the pixel electrode is in a planar structure. In yet other embodiments, the pixel electrode and the common electrode are both in a strip-shaped structure.

[0139] In some embodiments, referring to FIG. 1, 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 or substantially perpendicular to each other. Figures 9a-9b In some embodiments, the first polarizer 18 is arranged on the side of the first substrate 11 away from the liquid crystal layer 14, and the second polarizer 19 is arranged on the side of the second substrate 12 away from the liquid crystal layer 14.

[0140] The first polarizer 18 and the second polarizer 19 are used to change the polarization state of light, and the first polarizer 18 is used to make the light emitted from the backlight module into linearly polarized light.

[0141]

[0142] ​Optionally, the optical compensation layer 15 is a +A compensation film layer. The +A compensation film layer satisfies nx>ny=nz, wherein nx is the refractive index of the +A compensation film layer in the X-axis direction in the plane of the +A compensation film layer, ny is the refractive index of the +A compensation film layer in the Y-axis direction perpendicular to the X-axis in the plane of the +A compensation film layer, and nz is the refractive index of the +A compensation film layer in the thickness direction of the +A compensation film layer.

[0143] Reference Figure 10 As shown in the figure, the embodiments of the present disclosure also provide a preparation method of the liquid crystal display panel 1, comprising:

[0144] S1, forming a first alignment film 141 on one side of a first substrate 11.

[0145] The material of the first alignment film 141 is, for example, polyimide, which is coated on the first substrate 11 by coating, and then the alignment process of the first alignment film 141 is performed.

[0146] S2, forming a third alignment film 151 on one side of a second substrate 12.

[0147] S3, forming a first liquid crystal molecule layer 150 on the third alignment film 151 and curing, the first liquid crystal molecule 150' having a third pre-tilt angle γ.

[0148] The curing of the first liquid crystal molecule layer 150 is achieved, for example, by adding a polymer, such as a photopolymer or a thermal polymer, to the first liquid crystal molecule 150', and then curing the polymer by ultraviolet light, heating, etc.

[0149] S4, forming a second alignment film 142 on the first liquid crystal molecule layer 150.

[0150] S5, assembling the first substrate 11 with the first alignment film 141 formed thereon and the second substrate 12 with the second alignment film 142 formed thereon, and forming a second liquid crystal molecule layer 140 between the first alignment film 141 and the second alignment film 142; wherein the part of the second liquid crystal molecule layer 140 close to the first alignment film 141 has a first pre-tilt angle α, and the part of the second liquid crystal molecule layer 140 close to the second alignment film 142 has a second pre-tilt angle β. The direction of the first pre-tilt angle α is opposite or substantially opposite to the direction of the second pre-tilt angle β, and the direction of the third pre-tilt angle γ is the same or substantially the same as the direction of the first pre-tilt angle α or the direction of the second pre-tilt angle β.

[0151] The first liquid crystal molecule 150' and the second liquid crystal molecule 140' can be the same kind of liquid crystal molecule or different kinds of liquid crystal molecules, as long as the design requirements of the liquid crystal display panel 1 in the present disclosure are met, which are not limited in the present disclosure.

[0152] The preparation method of the liquid crystal display panel 1 has the same beneficial effects as the liquid crystal display panel 1, and thus will not be described again.

[0153] Optionally, as shown in FIG. 1, before forming the second alignment film 142 on the first liquid crystal molecule layer 150, the preparation method further comprises: Figure 7

[0154] A flat layer 16 is formed on the first liquid crystal molecule layer 150. The flat layer 16 can make the side surface of the first liquid crystal molecule layer 150 close to the liquid crystal layer 14 more flat, so as to facilitate the subsequent preparation of the second alignment film 142 on the flat layer 16.

[0155] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.​

Claims

1. A liquid crystal display panel, characterized in that, include: A first substrate and a second substrate disposed opposite to each other; A liquid crystal layer is disposed between a first substrate and a second substrate; the liquid crystal layer includes a first alignment film and a second alignment film 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 the second liquid crystal molecules in the second liquid crystal molecule layer that is close to it, such 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 in the second liquid crystal molecule layer that is close to it, such 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 or substantially opposite to the direction of the second pretilt angle. An optical compensation layer is disposed 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 first liquid crystal molecule layer being solidified in the optical compensation layer; the third alignment film is configured to anchor a first liquid crystal molecule in the first liquid crystal molecule layer that is close to it, causing the first liquid crystal molecule close to the third alignment film to generate a third pretilt angle; the direction of the third pretilt angle is the same as or approximately the same as the direction of the first pretilt angle or the second pretilt angle; the ranges of the first pretilt angle, the second pretilt angle, and the third pretilt angle are... ; The optical compensation layer is disposed between the first substrate and the second substrate; the sum of the phase retardation of the optical compensation layer and the phase retardation of the liquid crystal layer is equal to a positive integer multiple of the first wavelength; the range of the first wavelength is... ; The first liquid crystal molecule layer is located between the first alignment film and the third alignment film, or the first liquid crystal molecule layer is located between the second alignment film and the third alignment film.

2. The liquid crystal display panel according to claim 1, characterized in that, The orthographic projection of the long axis of the first liquid crystal molecule onto the plane of the first alignment film is parallel or approximately parallel to the orthographic projection of the long axis of the second liquid crystal molecule onto the plane of the third alignment film.

3. The liquid crystal display panel according to claim 1, characterized in that, The alignment directions of the first alignment film, the second alignment film, and the third alignment film are the same.

4. The liquid crystal display panel according to claim 1, characterized in that, The phase delay range of the optical compensation layer is: The phase retardation range of the liquid crystal layer is: .

5. The liquid crystal display panel according to claim 1, characterized in that, The third alignment film is disposed on the side of the first substrate near the liquid crystal layer; Alternatively, the third alignment film may be disposed on the side of the second substrate near the liquid crystal layer.

6. The liquid crystal display panel according to claim 1, characterized in that, The optical compensation layer further includes a third substrate, wherein the third substrate and the third alignment film are located on the same side or opposite side of the first liquid crystal molecule layer.

7. The liquid crystal display panel according to claim 6, characterized in that, The third alignment film and the second alignment film are disposed on opposite sides of the third substrate.

8. The liquid crystal display panel according to claim 6, characterized in that, The optical compensation layer further includes a fourth alignment film, which is disposed on the side of the third substrate away from the liquid crystal layer or on the 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 that is close to it, 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 approximately opposite to the direction of the third pretilt angle.

9. The liquid crystal display panel according to claim 8, characterized in that, The fourth alignment film and the second alignment film are disposed on opposite sides of the third substrate.

10. The liquid crystal display panel according to claim 1, characterized in that, The third alignment film is disposed on the side of the second substrate near the liquid crystal layer, and the first liquid crystal molecule layer is further provided with a planarization layer on the side near the liquid crystal layer, and the second alignment film is disposed on the side of the planarization layer near the liquid crystal layer.

11. The liquid crystal display panel according to claim 1, characterized in that, The optical compensation layer is a +A compensation film layer.

12. The liquid crystal display panel according to claim 1, characterized in that, The first pretilt angle, the second pretilt angle, and the third pretilt angle are equal or approximately equal.

13. The liquid crystal display panel according to claim 1, characterized in that, The ranges of the first pretilt angle, the second pretilt angle, and the third pretilt angle are: .

14. The liquid crystal display panel according to claim 1, characterized in that, The first substrate is further provided with a functional film layer; the optical compensation layer is disposed on the side of the functional film layer close to the liquid crystal layer.

15. A display device, characterized in that, Including the liquid crystal display panel as described in any one of claims 1-14.

16. A method for manufacturing a liquid crystal display panel, characterized in that, The preparation method is used to prepare a liquid crystal display panel as described in any one of claims 1 to 14, and the preparation method includes: A first alignment film is formed on one side of the first substrate. A third alignment film is formed on one side of the second substrate. A first liquid crystal molecule layer is formed and cured on a third alignment film, wherein the first liquid crystal molecule has a third pretilt angle; the third alignment film and the first liquid crystal molecule layer form an optical compensation layer. A second alignment film is formed on the first liquid crystal molecular layer; The first substrate having the first alignment film and the second substrate having the second alignment film are assembled into a cell, and a second liquid crystal molecule layer is formed between the first alignment film and the second alignment film. Wherein, the portion of the second liquid crystal molecules in the second liquid crystal molecule layer that is close to the first alignment film has a first pretilt angle, and the portion of the second liquid crystal molecules in the second liquid crystal molecule layer that is close to the second alignment film has a second pretilt angle; The direction of the first pre-tilt angle is opposite or approximately opposite to the direction of the second pre-tilt angle, and the direction of the third pre-tilt angle is the same as or approximately the same as the direction of the first pre-tilt angle or the second pre-tilt angle; the ranges of the first pre-tilt angle, the second pre-tilt angle, and the third pre-tilt angle are as follows: ; The optical compensation layer is disposed between the first substrate and the second substrate, and the first liquid crystal molecule layer is located between the second alignment film and the third alignment film; the sum of the phase retardation of the optical compensation layer and the phase retardation of the liquid crystal layer is equal to a positive integer multiple of the first wavelength; the range of the first wavelength is... .

17. The method for manufacturing a liquid crystal display panel according to claim 16, characterized in that, Before forming the second alignment film on the first liquid crystal molecular layer, the preparation method further includes: A planarization layer is formed on the first liquid crystal molecular layer.

Images