Display panel

Abstract

This application relates to a display panel. By aligning a first alignment layer and a second alignment layer in the same direction, aligning the pretilt angles of the first and second liquid crystal molecules, and setting the tilt directions of the first and second liquid crystal molecules to be opposite, the application compensates for differences in phase delay when light passes through the liquid crystal layer from different directions. This ensures that the phase delay of the liquid crystal layer is consistent when the display panel is viewed from different viewing angles, effectively reducing the color shift of the display panel at wide viewing angles and improving the user experience.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a display panel. Background Art

[0002] Liquid crystal displays (LCDs) have seen rapid development in recent years due to their small size, low power consumption, and zero radiation. The main structure of an LCD consists of a cell-aligned thin-film transistor (TFT) array substrate and a color filter (CF) substrate. Liquid crystal (LC) molecules are placed between the array and CF substrates. Controlling the common and pixel electrodes creates an electric field that drives the liquid crystal deflection, achieving grayscale display.

[0003] LCDs can be categorized by display mode: twisted nematic (TN), vertical alignment (VA), in-plane switching (IPS), and advanced super-dimensional switching (ADS). ADS, a horizontal electric field display, offers advantages such as wide viewing angles, high aperture ratios, high transmittance, high resolution, fast response times, low power consumption, and minimal color shift.

[0004] However, in dark mode, ADS display devices are prone to color shifts such as yellowing, redding, and bluish tints as the viewing angle changes, affecting the application of ADS display modes in curved products and reducing customer experience. Summary of the Invention

[0005] The present application provides a display panel that solves the color shift problem caused by a wide viewing angle in dark display.

[0006] To solve the above technical problems, the present application provides a display panel, comprising:

[0007] a first substrate;

[0008] a second substrate, disposed opposite to the first substrate;

[0009] an alignment layer, comprising a first alignment layer and a second alignment layer, wherein the first alignment layer is formed on a side of the first substrate facing the second substrate, and the second alignment layer is formed on a side of the second substrate facing the first substrate;

[0010] A liquid crystal layer is located between the first alignment layer and the second alignment layer, the liquid crystal layer includes a plurality of first liquid crystal molecules and a plurality of second liquid crystal molecules, the first liquid crystal molecules are close to the first alignment layer, the second liquid crystal molecules are close to the second alignment layer, and the first alignment layer and the second alignment layer have the same orientation direction;

[0011] The pre-tilt angle of the first liquid crystal molecules is the same as the pre-tilt angle of the second liquid crystal molecules, and the tilt directions of the first liquid crystal molecules and the second liquid crystal molecules are opposite.

[0012] In one embodiment, the first alignment layer and the second alignment layer are both rubbed in a rubbing orientation process, and the rubbing directions of the first alignment film and the second alignment film are the same, so that the first alignment layer and the second alignment layer have the same orientation.

[0013] In one embodiment, the pre-tilt angle of the first liquid crystal molecules and the pre-tilt angle of the second liquid crystal molecules are 0° to 1°.

[0014] In one embodiment, the second substrate includes a second substrate and a color resist layer, the color resist layer is located on a side of the second substrate close to the liquid crystal layer, and the color resist layer includes red color resist, green color resist and blue color resist, wherein

[0015] The refractive index difference between the red color resist and the green color resist is smaller than the refractive index difference between the blue color resist.

[0016] In one embodiment, the refractive index difference between the red color resist and the green color resist is less than 5 nm, and the refractive index difference between the blue color resist is 5 nm to 15 nm.

[0017] In one embodiment, the transmittance of the red color resist and the green color resist is less than the transmittance of the blue color resist.

[0018] In one embodiment, the optical retardation of the liquid crystal layer is less than 320 nm.

[0019] In one embodiment, the display panel further includes a backlight module, which is located on a side of the first substrate away from the liquid crystal layer, and light emitted by the backlight module sequentially passes through the first substrate, the first alignment layer, the liquid crystal layer, the second alignment layer, and the second substrate;

[0020] When the first liquid crystal molecules and the second liquid crystal molecules are positive liquid crystals, the light emitted by the backlight module propagates in the liquid crystal layer in a normal mode; or

[0021] When the first liquid crystal molecules and the second liquid crystal molecules are configured as negative liquid crystals, the light emitted by the backlight module propagates in the liquid crystal layer in a non-normal mode.

[0022] In one embodiment, the first substrate may be configured as one of an organic film substrate and a non-organic film substrate, wherein the organic film substrate and the non-organic film substrate each include a first substrate and a first conductive layer, a first insulating layer, a second insulating layer, and a second conductive layer formed on a side of the first substrate close to the liquid crystal layer;

[0023] The first insulating layer includes a first sub-insulating layer and a second sub-insulating layer, and the thickness of the first sub-insulating layer is greater than that of the second sub-insulating layer.

[0024] In one embodiment, the non-organic film substrate sequentially forms the first conductive layer, the first insulating layer, the second insulating layer, and the second conductive layer on a side of the first substrate facing the liquid crystal layer.

[0025] In one embodiment, the organic film substrate further includes an organic film layer, and the first insulating layer, the organic film layer, the first conductive layer, the second insulating layer and the second conductive layer are sequentially formed on the side of the first substrate facing the liquid crystal layer.

[0026] In one embodiment, the thickness of the first insulating layer is or One of, and / or

[0027] The thickness of the second insulating layer is

[0028] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0029] It can be seen from the above embodiments that the present application, by setting the orientation directions of the first alignment layer and the second alignment layer to be the same, setting the pretilt angle of the first liquid crystal molecule to be the same as the pretilt angle of the second liquid crystal molecule, and setting the tilt directions of the first liquid crystal molecule and the second liquid crystal molecule to be opposite, can compensate for the phase delay difference of light passing through the liquid crystal layer from different directions, so that the phase delay of the liquid crystal layer is consistent when the human eye views the display panel at different viewing angles, thereby effectively changing the color deviation phenomenon of the display panel at a large viewing angle, thereby improving the customer experience.

[0030] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 A schematic structural diagram of a display panel provided in one embodiment of the present application in which the first substrate is configured as a non-organic film substrate.

[0033] Figure 2 A schematic structural diagram of a display panel in which a first substrate is configured as an organic film substrate is provided in one embodiment of the present application.

[0034] Figure 3 for Figure 1 A simplified structural diagram of the first substrate, the second substrate and the liquid crystal layer.

[0035] Figure 4 for Figure 2 Schematic diagram of the state structure of liquid crystal molecules.

[0036] Figure 5 Schematic diagram of the structure of the display area of ​​the display screen half provided in one embodiment of the present application.

[0037] Figure 6 Schematic diagram of the variation of the color coordinate Wx of the first sub-insulating layer with film thickness provided in one embodiment of the present application.

[0038] Figure 7 A schematic diagram of the variation of the color coordinate Wy of the first sub-insulating layer with film thickness is provided in one embodiment of the present application.

[0039] Description of reference numerals:

[0040] 10. First substrate; 101. First underlayer; 102. First conductive layer; 103. First insulating layer; 104. Second insulating layer; 105. Second conductive layer; 106. Organic film layer; 1031. First sub-insulating layer; 1032. Second sub-insulating layer; 20. Second substrate; 201. Second underlayer; 202. Color resist layer; 2021. Red color resist; 2022. Green color resist; 2023. Blue color resist; 30. Liquid crystal layer; 301. First liquid crystal molecules; 302. Second liquid crystal molecules; 40. Alignment layer; 401. First alignment layer; 402. Second alignment layer; 50. Backlight module; 60. First polarizer; 70. Second polarizer.

[0041] α1, first included angle; α2, second included angle; q1, first tilt direction; q2, second tilt direction; g1, first optical axis; g2, second optical axis. DETAILED DESCRIPTION

[0042] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of devices consistent with certain aspects of the present application, as detailed in the appended claims.

[0043] In this specification, the terms "film" and "layer" may be interchanged. For example, "conductive layer" may be replaced with "conductive film." Similarly, "insulating layer" may be replaced with "insulating film."

[0044] Taking the TFT-LCD in ADS display mode as an example, you can refer to Figure 1 As for the part, the display panel includes CF (Color Filter, which can be understood as the second substrate 20 in this application), TFT (Thin Film Transistor, which can be understood as the first substrate 10 in this application) and a liquid crystal layer 30 located between the CF substrate and the TFT substrate. The liquid crystal molecules in the liquid crystal layer 30 have an initial optical axis in the horizontal direction. In order to ensure normal display, the outer sides of the CF substrate and the TFT substrate are respectively provided with a first polarizer 60 and a second polarizer 70 whose light transmission axes are perpendicular to each other. Since liquid crystal cannot emit light, the display panel is also provided with a backlight source, and the light emitted by the backlight source is emitted through the first polarizer 60, the TFT substrate, the liquid crystal layer 30, the CF substrate and the second polarizer 70 in sequence. In the absence of voltage, the liquid crystal has no distorting effect on the light. After passing through the first polarizer 60 and the liquid crystal, the polarization direction of the light is perpendicular to the light transmission axis direction of the second polarizer 70, and the light cannot pass through, thereby displaying a dark picture, and the display panel is in a dark state. When voltage is applied, the liquid crystal molecules rotate, distorting the light and changing its polarization direction, allowing it to pass through the second polarizer 70 and exit, resulting in a bright image. The display panel is in a bright state. Because the array substrate and the counter substrate are typically made of glass, which has a birefringent effect on light, when the display panel is bent or pressed, the glass changes from an isotropic medium to an optically anisotropic medium. Depending on the stress applied, the glass produces non-uniform stress birefringence, causing the polarization state of light passing through the glass to change.

[0045] Typically, the polarization state generated by the base substrate of the CF substrate and the polarization state generated by the base substrate of the TFT substrate are equal in phase and opposite in direction. In the absence of the liquid crystal layer 30, the polarization states generated by the two base substrates can be offset. However, due to the presence of the liquid crystal layer 30, the liquid crystal amplifies the phase difference, resulting in the polarization states generated by the two base substrates being unable to offset each other, resulting in the problem of dark state (L0) color shift.

[0046] Related technologies have proposed methods such as setting a blue color-blocking filter structure on the CF substrate and forming an orientation adjustment structure between the CF substrate or the TFT substrate to improve the large viewing angle color deviation phenomenon of the ADS display device under dark display. However, the applicant has found through research that although the relevant schemes have improved the color deviation problem to a certain extent, they are not ideal in terms of the final display effect of the display panel or the difficulty and cost of production, and the cost-effectiveness is low. The applicant can effectively improve the color deviation problem by adjusting the process of the display panel and optimizing and selecting the matching materials, thereby improving the picture quality of the dark display and effectively reducing the production cost.

[0047] The present application provides a display panel, comprising a first substrate 10 and a second substrate 20 arranged opposite to each other, an alignment layer 40, and a liquid crystal layer 30 located between the first substrate 10 and the second substrate 20. The alignment layer 40 comprises a first alignment layer 401 and a second alignment layer 402. The first alignment layer 401 is formed on the side of the first substrate 10 facing the second substrate 20, and the second alignment layer 402 is formed on the side of the second substrate 20 facing the first substrate 10. The liquid crystal layer 30 comprises a plurality of first liquid crystal molecules 301 and a plurality of second liquid crystal molecules 302. The first liquid crystal molecules 301 are adjacent to the first alignment layer 401, and the second liquid crystal molecules 302 are adjacent to the second alignment layer 402. The first alignment layer 401 and the second alignment layer 402 have the same orientation direction.

[0048] The pre-tilt angle of the first liquid crystal molecule 301 is the same as the pre-tilt angle of the second liquid crystal molecule 302 , and the tilt directions of the first liquid crystal molecule 301 and the second liquid crystal molecule 302 are opposite.

[0049] It should be noted that this application is explained using TFT-LCD as an example, and the accompanying drawings are all schematic diagrams of the structure of TFT-LCD. Therefore, to facilitate subsequent reading and understanding, the first substrate 10 in this application is directly configured as a TFT substrate and the second substrate 20 is directly configured as a CF substrate for discussion of subsequent embodiments.

[0050] Reference Figure 3 and Figure 4 , Figure 4Part (a) shows a schematic diagram of the state of the first liquid crystal molecules 301. In the initial, unpowered state, the first liquid crystal molecules 301 are aligned according to the orientation of the first alignment layer 401. As shown in the figure, relative to the surface of the first substrate 10, the first optical axis g1 of the first liquid crystal molecules 301 extends along the -XZ direction, thereby forming a first angle α1 and a first tilt direction q1. The first angle α1 is the pretilt angle of the first liquid crystal molecules 301.

[0051] Continue to refer to Figure 3 and Figure 4 , Figure 4 Part b in the middle diagram shows the state of the second liquid crystal molecules 302. In the initial, unpowered state, the second liquid crystal molecules 302 are aligned according to the orientation direction of the second alignment layer 402. As shown in the figure, the second optical axis g2 of the second liquid crystal molecules 302 extends along the XZ direction relative to the surface of the second substrate 20, thereby forming a second angle α2 and a second tilt direction q2, where the second angle α2 is the pretilt angle of the second liquid crystal molecules 302.

[0052] Due to the effect of the pretilt angle, light passing through the liquid crystal from different directions will experience different phase delays, that is, there will be phase delay differences. When the human eye views the display panel at different angles, this phase delay difference will cause color shift. In this embodiment, by setting the pretilt angles of the first liquid crystal molecules 301 and the second liquid crystal molecules 302 to be the same, and the first tilt direction q1 and the second tilt direction q2 to be opposite, it can also be understood that the first liquid crystal molecules 301 and the second liquid crystal molecules 302 are mirror-symmetrical about the central horizontal plane of the liquid crystal layer 30. This compensates for the phase delay differences of light passing through the liquid crystal layer 30 from different directions, ensuring that the phase delay of the liquid crystal layer 30 is consistent when the human eye views the display panel at different angles, thereby improving the color shift phenomenon.

[0053] In some embodiments, the first alignment layer 401 and the second alignment layer 402 may be formed using a rubbing process or an optical alignment (OA) process.

[0054] In some embodiments, the first alignment layer 401 and the second alignment layer 402 are both rubbed in the same direction so that the first alignment layer 401 and the second alignment layer 402 have the same orientation.

[0055] The alignment films on the first substrate 10 and the second substrate 20 are rubbed in the same direction using a rubbing device to form a first alignment layer 401 and a second alignment layer 402. Regularly arranged grooves are formed on the first alignment layer 401 and the second alignment layer 402, respectively. The regularly arranged grooves are used to align the first liquid crystal molecules 301 and the second liquid crystal molecules 302 along the groove direction in the absence of an electric field, thereby achieving alignment of the liquid crystal molecules.

[0056] Furthermore, according to different application scenarios of the display panel, the rubbing direction can be set accordingly during the production of the display panel to further solve the color shift problem of the display panel at different viewing angles.

[0057] Specifically, when the display panel is connected to other electronic devices, a DP (Data Pad, data pressing area side) side and a DPO (Data Pad Opposite, opposite to the data line pressing area) side are generated relative to each other.

[0058] When the user's upward viewing angle facing the display panel is an uncommon viewing angle, if the DP side of the display device equipped with the display panel faces downward for display, the first alignment layer 401 and the second alignment layer 402 are configured to be rubbed in a direction from the DPO side to the DP side. If the DPO side of the display device equipped with the display panel faces downward for display, the first alignment layer 401 and the second alignment layer 402 are configured to be rubbed in a direction from the DP side to the DPO side.

[0059] When the user's top-down viewing angle facing the display panel is an uncommon viewing angle, if the DP side of the display device equipped with the display panel faces downward for display, the first alignment layer 401 and the second alignment layer 402 are configured to be rubbed in a direction from the DP side to the DPO side. If the DPO side of the display device equipped with the display panel faces downward for display, the first alignment layer 401 and the second alignment layer 402 are configured to be rubbed in a direction from the DPO side to the DP side.

[0060] In some embodiments, the pre-tilt angle of the first liquid crystal molecules 301 and the pre-tilt angle of the second liquid crystal molecules 302 are 0° to 1°.

[0061] Setting the pretilt angle within this range allows the first liquid crystal molecules 301 and the second liquid crystal molecules 302 to align almost parallel to the substrate surface. This configuration effectively improves the display panel's reddening at oblique viewing angles, achieving a wider viewing angle range and better dark-state image quality, thereby significantly enhancing the customer experience.

[0062] Preferably, the pretilt angles of the first liquid crystal molecules 301 and the second liquid crystal molecules 302 , ie, the first angle α1 and the second angle α2 are both set to 0.1°.

[0063] It should be noted that in some possible implementations, the first pretilt angle and the second pretilt angle may not be strictly equal, and a certain tolerance range may exist. For example, the tolerance range is within ±30%, which is within the scope of protection of this application. In some possible implementations, the optical axes of the liquid crystal molecules near the first alignment layer 401 can be arranged to rotate counterclockwise relative to the horizontal plane, while the optical axes of the liquid crystal molecules near the second alignment layer 402 can be deflected clockwise relative to the horizontal plane; or, the optical axes of the liquid crystal molecules near the first alignment layer 401 can be arranged to rotate clockwise relative to the horizontal plane, while the optical axes of the liquid crystal molecules near the second alignment layer 402 can be deflected counterclockwise relative to the horizontal plane. This embodiment is not specifically limited here.

[0064] In some embodiments, the second substrate 20 includes a second substrate 201 and a color resist layer 202, the color resist layer 202 is located on the side of the second substrate 201 close to the liquid crystal layer 30, and the color resist layer 202 includes a red color resist 2021, a green color resist 2022, and a blue color resist 2023, wherein the refractive index difference between the red color resist 2021 and the green color resist 2022 is less than the refractive index difference between the blue color resist 2023.

[0065] A refractive index difference refers to the difference in refractive index between two media. When light passes from one medium to another, the different refractive indices of the media cause the light to refract. For RGB colors, each color has a different wavelength, so their refractive indices will also differ within the same material.

[0066] The refractive index related factors of the color resist layer can be referred to the following formula:

[0067]

[0068] Among them, R th is the refractive index difference between the parallel direction and the thickness direction of the film, d is the thickness of the color resist layer, n x is the refractive index of the color resist layer in the X-axis direction, n y is the refractive index of the color resist layer in the Y-axis direction perpendicular to the X-axis, n z is the refractive index in the thickness direction of the color resist layer.

[0069] As can be seen from the above, the large difference in refractive index between the red, green, and blue color resists 2021, 2022, and 2023 results in changes in the light entering the display panel at different viewing angles, resulting in a color cast. However, in actual applications of display panels, customers or consumers are more likely to accept a visual experience with a bluish tint. Therefore, this application effectively changes the color cast of the display panel from reddish to bluish in dark mode by setting the refractive index difference between the red and green color resists 2021, 2022 to be smaller than that of the blue color resist 2023, thereby effectively improving customer experience and satisfaction.

[0070] Furthermore, the refractive index difference between the red color resist 2021 and the green color resist 2022 can be the same or different, as long as both satisfy the condition of being smaller than the blue color resist 2023 .

[0071] In some embodiments, the refractive index difference between the red color resist 2021 and the green color resist 2022 is less than 5 nm, and the refractive index difference between the blue color resist 2023 is 5 nm to 15 nm.

[0072] In actual product applications, the refractive index difference values ​​of the red color resist 2021, the green color resist 2022 and the blue color resist 2023 are calculated to produce a display panel that meets consumer needs.

[0073] Specifically, the refractive index of the red color resist 2021 and the green color resist 2022 is one of 1 nm, 2 nm, 3 nm, 4 nm, and 5 nm, and the refractive index of the blue color resist 2023 is one of 5 nm, 7 nm, 9 nm, 11 nm, 13 nm, and 15 nm.

[0074] In some embodiments, the transmittance of the red color resist 2021 and the green color resist 2022 is less than the transmittance of the blue color resist 2023 .

[0075] Transmittance refers to the transmission ratio of light after passing through a medium or device, that is, the proportion of light entering the medium or device that passes through the medium or device and continues to propagate.

[0076] The principle is the same as that of the above embodiment. Customers or consumers are more likely to accept the bluish color of the display panel. By setting the control, the transmittance of the red color resistance 2021 and the green color resistance 2022 is set to be lower than the transmittance of the blue color resistance 2023 to neutralize the redness of the display panel in dark display, thereby improving the customer experience and satisfaction.

[0077] In some embodiments, the optical retardation of the liquid crystal layer is less than 320 nm.

[0078] In optics, retardation usually refers to the phase delay caused by light when passing through liquid crystal materials, that is, the time delay experienced by light waves when passing through the liquid crystal layer.

[0079] First, the greater the optical delay of the liquid crystal, the slower the display response speed. This is because the time it takes for light to propagate through the liquid crystal increases, and the alignment of the liquid crystal molecules also takes longer to adjust. This can lead to a slower image refresh rate and affect the display's response speed. Second, an increase in optical delay can increase the optical path difference between different pixels in the liquid crystal display, thereby affecting the display's color purity and color reproduction performance. Finally, an increase in optical delay can also affect the performance of the display panel, potentially affecting the clarity and accuracy of the image. Therefore, reducing the optical delay of the liquid crystal can effectively improve the color shift of the display panel at oblique viewing angles when displaying in the dark state.

[0080] The light delay formula of the liquid crystal layer is:

[0081] Retardation=Δn*d

[0082] Here, retardation refers to the amount of light delay, Δn is the refractive index difference of the liquid crystal molecules, and d is the cell thickness of the display (ie, the height of the gap between the first substrate and the second substrate).

[0083] With reference to the above formula, experiments were conducted to evaluate the color shift improvement effect of the display panel according to the embodiment of the present application. The following table lists the selection and comparison of various parameter values ​​of the optical delay of the existing display panel and the optical delay of the present application.

[0084] Table 1 - Solutions for display panels with different optical delays

[0085] Existing solutions Example 1 Example 2 Δn 0.113 0.113 0.113 d(um) 3.0 2.8 2.6 Retardation(nm) 339 316 293.8 Color cast big Small Small

[0086] As shown in the table above, reducing the LCD cell thickness can effectively improve the color shift phenomenon of the display surface at oblique viewing angles. Furthermore, by selecting the LCD cell thickness and the refractive index difference to keep the optical retardation below 320nm, the large color shift in the display panel's dark state can be reduced. For example, the optical retardation of the display panel in the table above can be set to 316nm or 293.8nm.

[0087] In some embodiments, the display panel further includes a backlight module 50, which is located on a side of the first substrate 10 away from the liquid crystal layer 30. Light emitted by the backlight module 50 sequentially passes through the first substrate 10, the first alignment layer 401, the liquid crystal layer 30, the second alignment layer 402, and the second substrate 20. When the first liquid crystal molecules 301 and the second liquid crystal molecules 302 are positive liquid crystals, the light emitted by the backlight module 50 propagates in the liquid crystal layer 30 using a normal mode. Alternatively, when the first liquid crystal molecules 301 and the second liquid crystal molecules 302 are negative liquid crystals, the light emitted by the backlight module 50 propagates in the liquid crystal layer 30 using a non-normal mode.

[0088] In liquid crystal display technology, light propagates in the liquid crystal layer 30 in the normal mode, also known as O-mode. In O-mode, the liquid crystal molecules are arranged so that light passes along a path with a normal refractive index. In this mode, the arrangement of the liquid crystal molecules causes the polarization direction of light emitted by the backlight module 50 to remain unchanged, thus producing a specific optical effect.

[0089] In liquid crystal display technology, light propagates in an unusual mode within the liquid crystal layer 30, also known as E-mode (extraordinary mode). In E-mode, the arrangement of liquid crystal molecules causes light to travel along an unusual refractive index path. In this mode, the arrangement of liquid crystal molecules causes the polarization of light to change, resulting in a unique optical effect.

[0090] In actual application, the transmission mode is selected according to the characteristics of different products. That is, the E-mode scheme is used in the negative liquid crystal or the O-mode scheme is used in the positive liquid crystal in different products. This can improve the color deviation of the display surface and effectively solve the problem of the display panel turning red at a large viewing angle.

[0091] In some embodiments, reference Figure 1 The first substrate 10 can be configured as a non-organic film substrate and includes a first substrate 101 and a first conductive layer 102, a first insulating layer 103, a second insulating layer 104, and a second conductive layer 105 formed in sequence on a side of the first substrate 101 close to the liquid crystal layer 30. The first insulating layer 103 includes a first sub-insulating layer 1031 and a second sub-insulating layer 1032. The first sub-insulating layer 1031 is thicker than the second sub-insulating layer 1032.

[0092] In some embodiments, reference Figure 2 The first substrate 10 can be configured as an organic film substrate, including a first substrate 101 and the first insulating layer 103, the organic film layer 106, the first conductive layer 102, the second insulating layer 104 and the second conductive layer 105 formed in sequence on the side of the first substrate facing the liquid crystal layer.

[0093] The general preparation process of a non-organic film TFT substrate is as follows: First, a gate line, a gate electrode and a common electrode pattern are formed on the array substrate. (Equivalent to the first conductive layer 102 of the present application). Secondly, a gate insulating layer (equivalent to the first insulating layer 103 of the present application) covering the gate line, the gate electrode and the common electrode and an active layer arranged on the gate insulating layer are formed. Then, a data line, a source electrode and a drain electrode are formed, and a conductive channel is formed between the source electrode and the drain electrode. Then, a passivation layer (equivalent to the second insulating layer 104 in the present application) covering the data line, the source electrode and the drain electrode is formed, and a via hole exposing the drain electrode is opened on the passivation layer. Finally, a pixel electrode (equivalent to the second conductive layer 105 in the present application) is formed on the passivation layer, and the pixel electrode is connected to the drain electrode through the via hole on the passivation layer.

[0094] Since this embodiment focuses on improving or selecting the thickness of the insulating layer, and the specific preparation process of the TFT substrate, the passivation layer and the insulating layer material process are common knowledge in the art, they will not be elaborated here.

[0095] Further, refer to Figure 5 The display area of ​​the display panel includes the BM area and the AA area not covered by the BM. BM refers to "Black Matrix". The black substrate is a technology used in liquid crystal displays to block the area where backlight passes through in order to improve the display effect and contrast. The black substrate is usually located between the edge and the pixel of the liquid crystal panel to block the area where backlight passes through, preventing light from interfering with adjacent pixels, thereby improving the display clarity and contrast. The dark state display color shift is essentially the change in the color coordinates (Wx, Wy) of the non-BM covered area in the AA area at different viewing angles. The greater the change in color coordinates, the greater the color shift.

[0096] In this embodiment, during the actual production process of a display panel, the first insulating layer 103 is formed twice to ensure the quality of the display surface, that is, the first sub-insulating layer 1031 and the second sub-insulating layer 1032 are formed respectively. Figure 6 and Figure 7 Schematic diagram showing the variation of the color coordinates of the first sub-insulating layer 1031 with the film thickness obtained during the experiment. Figure 6 is a schematic diagram showing how the color coordinate Wx of the first sub-insulating layer 1031 changes with film thickness. Figure 7 Schematic diagram of the change of the color coordinate Wy of the first sub-insulating layer 1031 with the film thickness.

[0097] As can be seen from the figure, variations in the thickness of the first sub-insulating layer 1031 significantly affect color coordinates. In actual display panel production, color shift can be improved by adjusting or selecting the thickness of the first sub-insulating layer 1031. Furthermore, the selected thickness has yielded positive feedback in practical applications.

[0098] In some embodiments, the thickness of the first insulating layer 103 is and The thickness of the second insulating layer 104 is

[0099] Preferably, the thickness of the first sub-insulating layer 1031 may be preferably or One of the above, and the thickness of the second sub-insulating layer 1032 can be configured accordingly according to the thickness of the first insulating layer 103.

[0100] For example, when the thickness of the first insulating layer 103 is set to When the thickness of the first sub-insulating layer 1031 is preferably The thickness of the corresponding second sub-insulating layer 1032 is selected to be For another example, when the thickness of the first insulating layer 103 is When the thickness of the first sub-insulating layer 1031 is preferably or The thickness of the corresponding second sub-insulating layer 1032 is selected to be or The configuration combinations of the thicknesses of the first sub-insulating layer 1031 and the second sub-insulating layer 1032 in the first insulating layer 103 of other thicknesses are analogous, and as long as the above conditions are met, they are all within the protection scope of the present application and will not be elaborated on here.

[0101] Preferably, when the thickness of the second insulating layer 104 is selected to be When the thickness of the first insulating layer 103 can be selected or For example, in a certain display panel, the thickness of the second insulating layer 104 is selected to be The thickness of the first insulating layer 103 is wait.

[0102] It should be noted that the number of sub-insulating layers included in the first insulating layer 103 is not limited. This application only uses the first sub-insulating layer 1031 and the second sub-insulating layer 1032 as examples for illustration. However, as long as the thickness requirement of the first sub-insulating layer 1031 is met, it is within the scope of protection of this application.

[0103] In some embodiments, the module design is optimized, with a display panel having a relatively low (warm) color temperature and paired with a backlight module 50 having a high (cold / blue) color temperature, so that the overall module color temperature is maintained at the center color temperature. However, due to the high (cold / blue) color temperature backlight module 50, the display panel's dark state display color temperature is relatively high, with an overall bluish tint. Consumers are more accustomed to and prefer a bluish dark state display, which can improve customer satisfaction.

[0104] Furthermore, the color temperature of the display panel can be made warmer (lower) to match the backlight by optimizing the color resistance type, liquid crystal type, liquid crystal cell thickness, RGB aperture ratio, etc. of the display panel so that the color temperature meets the requirements.

[0105] Table 2 below shows an example of lowering the color temperature of a display panel by changing the color resistance type for reference.

[0106] Table 2- Effect of replacing blue color resistance:

[0107]

[0108] As can be seen from the above table, when the type of backlight module 50 remains the same, by changing the type of blue color resist 2023, the color temperature of the same display panel can be reduced (from 7618 to 6491 in the above table), thereby achieving a warmer (lower) color temperature of the display panel to match the backlight, so that the color temperature meets the requirements and further improves customer experience and satisfaction.

[0109] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the art to which this application belongs. The use of "first," "second," and similar terms in this specification and claims does not indicate any order, quantity, or importance, but is simply used to distinguish different components. Similarly, words such as "a" or "an" do not indicate a quantitative limitation, but rather indicate the presence of at least one. If only "a" is referred to, this will be separately stated. "Multiple" or "several" means two or more. Unless otherwise indicated, words such as "front," "rear," "lower," and / or "upper" are for convenience only and are not limited to a single location or spatial orientation. Words such as "include" or "comprising" mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but can also include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0110] In the drawings, the sizes of various components, layer thicknesses, or regions are sometimes exaggerated for clarity. Therefore, the embodiments of this application are not necessarily limited to these dimensions, and the shapes and sizes of the components in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate idealized examples, and the embodiments of this application are not limited to the shapes or values ​​shown in the drawings.

[0111] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art may make various modifications, additions, or substitute similar methods for the described specific embodiments without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

[0112] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A display panel, characterized in that: include: a first substrate; a second substrate disposed opposite to the first substrate; the second substrate comprising a second substrate and a color resist layer, the color resist layer being located on a side of the second substrate close to the liquid crystal layer, the color resist layer comprising red, green, and blue color resists, the refractive index difference between the red and green color resists being smaller than the refractive index difference between the blue color resists, the refractive index difference being the refractive index difference in a direction parallel to the color resist film and in a thickness direction; and the transmittance of the red and green color resists being smaller than the transmittance of the blue color resist; an alignment layer, comprising a first alignment layer and a second alignment layer, wherein the first alignment layer is formed on a side of the first substrate facing the second substrate, and the second alignment layer is formed on a side of the second substrate facing the first substrate; A liquid crystal layer is located between the first alignment layer and the second alignment layer, the liquid crystal layer includes a plurality of first liquid crystal molecules and a plurality of second liquid crystal molecules, the first liquid crystal molecules are close to the first alignment layer, the second liquid crystal molecules are close to the second alignment layer, and the first alignment layer and the second alignment layer have the same orientation direction; The pre-tilt angle of the first liquid crystal molecules is the same as the pre-tilt angle of the second liquid crystal molecules, and the tilt directions of the first liquid crystal molecules and the second liquid crystal molecules are opposite.

2. The display panel according to claim 1, wherein: The first alignment layer and the second alignment layer are both rubbed in the same direction so that the first alignment layer and the second alignment layer have the same orientation.

3. The display panel according to claim 1, wherein: The pretilt angle of the first liquid crystal molecules and the pretilt angle of the second liquid crystal molecules are 0° to 1°.

4. The display panel according to claim 1, wherein: The optical retardation of the liquid crystal layer is less than 320 nm.

5. The display panel according to any one of claims 1 to 4, characterized in that: The display panel further includes a backlight module, which is located on a side of the first substrate away from the liquid crystal layer, and the light emitted by the backlight module sequentially passes through the first substrate, the first alignment layer, the liquid crystal layer, the second alignment layer, and the second substrate; When the first liquid crystal molecules and the second liquid crystal molecules are positive liquid crystals, the light emitted by the backlight module propagates in the liquid crystal layer in a normal mode; or When the first liquid crystal molecules and the second liquid crystal molecules are configured as negative liquid crystals, the light emitted by the backlight module propagates in the liquid crystal layer in a non-normal mode.

6. The display panel according to any one of claims 1 to 4, characterized in that: The first substrate is configured as one of an organic film substrate and a non-organic film substrate, and each of the organic film substrate and the non-organic film substrate includes a first substrate and a first conductive layer, a first insulating layer, a second insulating layer, and a second conductive layer formed on a side of the first substrate close to the liquid crystal layer; The first insulating layer includes a first sub-insulating layer and a second sub-insulating layer, and the thickness of the first sub-insulating layer is greater than that of the second sub-insulating layer.

7. The display panel according to claim 6, wherein: The first conductive layer, the first insulating layer, the second insulating layer and the second conductive layer are sequentially formed on the side of the first substrate facing the liquid crystal layer.

8. The display panel according to claim 7, wherein: The organic film substrate further includes an organic film layer, and the first insulating layer, the organic film layer, the first conductive layer, the second insulating layer and the second conductive layer are sequentially formed on a side of the first substrate facing the liquid crystal layer.

9. The display panel according to claim 6, wherein: The thickness of the first insulating layer is one of 2000Å, 3500Å, 4500Å or 5500Å; and / or The thickness of the second insulating layer is 4000Å.

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