Display screen and display device

Abstract

The utility model discloses a display screen which comprises a VA liquid crystal layer, a cover plate and backlight, the VA liquid crystal layer comprises a surface substrate, a bottom substrate and a liquid crystal material filled between the surface substrate and the bottom substrate; polarizers are arranged on a surface substrate and a bottom substrate of the VA liquid crystal layer, compensation films are arranged on the polarizers, the retardation of the compensation films is set, and the range of the included angle between the absorption axis of the polarizers and the slow axis of the compensation films is 25-65 degrees, so that the optical compensation values of the polarizers and the compensation films and the optical path difference value of a liquid crystal material in the VA liquid crystal layer are mutually compensated; when the linear light is vibrated by external force, liquid crystal molecules of the VA liquid crystal layer cannot be arranged normally, the light is interfered, the circularly polarized light can effectively eliminate interference of external light, brightness of different visual angles is kept consistent, distortion of images displayed by the display screen is avoided, and the display screen achieves a good anti-vibration effect. The utility model further provides a display device which comprises the display screen.

Description

Technical Field

[0001] The utility model relates to the technical field of display devices, in particular to a display screen and a display device. Background Art

[0002] With the rapid development of display technology, consumers have higher and higher requirements for driving experience, and high-definition display is one of the most important indicators. The display effect of traditional TN (Twisted Nematic) products is not good, while VA (Vertical Alignment) products have better display effects and are deeply favored by consumers. The future trend of in-vehicle display screens will inevitably shift to VA display screen technology.

[0003] Due to the harsh vibration conditions of in-vehicle products, the vibration performance of existing VA technologies is worse than that of TN technologies. When the vibration reaches 10G during driving, the picture is distorted and the display effect is not good, which reduces the performance of in-vehicle display screens and affects the driving experience of vehicles. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a display screen and a display device to solve the problems existing in the above-mentioned prior art, improve the anti-vibration performance of the display screen, and improve the reliability of the display device.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a display screen, comprising:

[0007] A VA liquid crystal layer, which includes a front substrate, a bottom substrate, and liquid crystal material filled between the front substrate and the bottom substrate;

[0008] A cover plate, which is arranged on one side of the front substrate of the VA liquid crystal layer, and the cover plate is made of a transparent material;

[0009] A backlight, which is arranged on one side of the bottom substrate of the VA liquid crystal layer, and the backlight is used to provide a uniform light source for the VA liquid crystal layer;

[0010] Polarizers are arranged between the front substrate and the cover plate and between the bottom substrate and the backlight, and compensation films are arranged on the sides of the polarizers facing the VA liquid crystal layer.

[0011] Preferably, the retardation of the compensation film is R0 = 100nm - 200nm, Rth = 100nm - 200nm; the included angle range between the absorption axis of the polarizer and the slow axis of the compensation film is 25° - 65°.

[0012] Preferably, the polarizer is adhered to the VA liquid crystal layer. The polarizer adhered to the front substrate is a front polarizer, and the polarizer adhered to the bottom substrate is a bottom polarizer. The included angle between the absorption axes of the front polarizer and the bottom polarizer is 90° ± 5°.

[0013] Preferably, a compensation film is adhered to both the front polarizer and the bottom polarizer.

[0014] Preferably, the compensation film is a quarter-wave plate.

[0015] Preferably, the compensation film is made of cyclic olefin polymer or polycarbonate.

[0016] Preferably, the thickness range of the compensation film is 20 μm to 80 μm.

[0017] Preferably, the cell gap of the display screen is 3.0 μm to 5.5 μm, the twist angle of the display screen is 0°, and the retardation of the display screen is 280 nm to 500 nm.

[0018] Preferably, the surface of the cover plate is coated with an anti-glare coating and / or an anti-reflection layer.

[0019] The present utility model also provides a display device, including the above-mentioned display screen.

[0020] Preferably, the backlight of the display screen can be detachably connected to the vehicle structural member.

[0021] The present utility model has achieved the following technical effects compared with the prior art: The display screen of the present utility model includes a VA liquid crystal layer, a cover plate, and a backlight. The VA liquid crystal layer includes a front substrate, a bottom substrate, and a liquid crystal material filled between the front substrate and the bottom substrate; the cover plate is disposed on one side of the front substrate of the VA liquid crystal layer, and the cover plate is made of a transparent material; the backlight is disposed on one side of the bottom substrate of the VA liquid crystal layer, and the backlight is used to provide a uniform light source for the VA liquid crystal layer; polarizers are disposed between the front substrate and the cover plate and between the bottom substrate and the backlight, and a compensation film is disposed on the side of the polarizer facing the VA liquid crystal layer.

[0022] In the display screen of the present utility model, polarizers are disposed on both the front substrate and the bottom substrate of the VA liquid crystal layer, and a compensation film is disposed on the polarizer. By setting the retardation of the compensation film and the included angle between the absorption axis of the polarizer and the slow axis of the compensation film, the optical compensation values of the polarizer and the compensation film are mutually compensated with the optical path difference of the liquid crystal material in the VA liquid crystal layer. Linear light is changed to circularly polarized light through the compensation film. When subjected to external vibration, the liquid crystal molecules in the VA liquid crystal layer cannot be normally arranged, and the light will be interfered. The circularly polarized light can effectively eliminate the interference of external light, keep the brightness consistent at different viewing angles, thereby avoiding the distortion of the display image of the display screen and enabling the display screen to achieve a better anti-vibration effect.

[0023] The present utility model further provides a display device, which includes the above-mentioned display screen, thereby effectively improving the anti-vibration performance of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the disassembled structure of the display screen disclosed in the embodiment of the present utility model;

[0026] Figure 2 It is a schematic diagram of the structure of a compensation film in the prior art;

[0027] Figure 3 It is a schematic diagram of the structure of the compensation film of the display screen disclosed in the embodiment of the present utility model;

[0028] Figure 4 It is a schematic diagram of the optical principle of a compensation film in the prior art;

[0029] Figure 5 It is a schematic diagram of the optical principle of the compensation film of the display screen disclosed in the embodiment of the present utility model.

[0030] In the figure: 100, display screen;

[0031] 1, VA liquid crystal layer; 2, cover plate; 3, backlight; 4, surface polarizer; 5, bottom polarizer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0033] The purpose of the present utility model is to provide a display screen and a display device to solve the problems existing in the above-mentioned prior art, improve the anti-vibration performance of the display screen, and improve the reliability of the display device.

[0034] In order to make the above-mentioned objects, features and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0035] Embodiment 1

[0036] The display screen 100 of this embodiment includes a VA liquid crystal layer 1, a cover plate 2, and a backlight 3. For details, see Figure 1 , the VA liquid crystal layer 1 includes a front substrate, a bottom substrate, and a liquid crystal material filled between the front substrate and the bottom substrate; the cover plate 2 is arranged on one side of the front substrate of the VA liquid crystal layer 1, and the cover plate 2 is made of a transparent material; the backlight 3 is arranged on one side of the bottom substrate of the VA liquid crystal layer 1, and the backlight 3 is used to provide a uniform light source for the VA liquid crystal layer 1; polarizers are arranged between the front substrate and the cover plate 2 and between the bottom substrate and the backlight 3, and a compensation film is arranged on the side of the polarizer facing the VA liquid crystal layer 1.

[0037] For the display screen 100 of the present utility model, polarizers are arranged on both the front substrate and the bottom substrate of the VA liquid crystal layer 1, and compensation films are arranged on the polarizers. By setting the retardation of the compensation film and the angle between the absorption axis of the polarizer and the slow axis of the compensation film, the optical compensation values of the polarizer and the compensation film are mutually compensated with the optical path difference of the liquid crystal material in the VA liquid crystal layer 1. Linear light is changed into circularly polarized light through the compensation film. When the display screen 100 is vibrated by an external force, the liquid crystal molecules in the VA liquid crystal layer 1 cannot be arranged normally, and the light will be interfered. The circularly polarized light can effectively eliminate the interference of external light, keep the brightness consistent at different viewing angles, thereby avoiding the distortion of the display picture of the display screen 100, and keeping the display screen 100 with a high contrast. The display screen 100 of the present utility model has a contrast three times higher than that of the TN display screen in the prior art. While maintaining a high contrast, the display screen 100 of the present utility model achieves a good anti-vibration effect.

[0038] In this specific embodiment, the retardation of the compensation film is R0 = 100nm - 200nm, Rth = 100nm - 200nm; the angle range between the absorption axis of the polarizer and the slow axis of the compensation film is 25° - 65°, so that the optical compensation values of the polarizer and the compensation film are mutually compensated with the optical path difference of the liquid crystal material in the VA liquid crystal layer 1, and linear light is changed into circularly polarized light through the compensation film.

[0039] Among them, the polarizer is attached to the VA liquid crystal layer 1. The polarization degree of the polarizer is above 99.9%, minimizing light energy loss to the greatest extent and improving the polarization efficiency of the polarizer, so that the polarizer can effectively convert incident unpolarized light or partially polarized light into light with a single polarization direction. In this specific embodiment, the polarizer attached to the front substrate is the front polarizer 4, and the polarizer attached to the bottom substrate is the bottom polarizer 5. In actual applications, both the front substrate and the front polarizer 4, and the bottom substrate and the bottom polarizer 5 can be directly pasted, or a pasting device can be used to ensure the pasting accuracy. The pasting method can be selected according to the size and shape of the glass. The angle between the absorption axes of the front polarizer 4 and the bottom polarizer 5 is 90° ± 5°, effectively controlling the polarization state of the light passing through the display screen 100 to optimize the brightness and contrast of the displayed image and improve the overall performance of the display screen 100. It should also be explained here that in this embodiment, there is a certain tolerance range for the angle between the absorption axis of the polarizer and the slow axis of the compensating film, as well as the angle between the absorption axes of the front polarizer 4 and the bottom polarizer 5, allowing for certain deviations during the manufacturing process, reducing the manufacturing difficulty of the display screen 100 and facilitating the popularization and application of the display screen 100.

[0040] In this specific embodiment, the compensating film uses a quarter-wave plate, which can further improve the display performance of the display screen 100, reduce color distortion, and increase the contrast. For details, please refer to Figures 2 - 4 , the refractive indices of the compensating film in this embodiment along three orthogonal directions (two directions in the plane of the film and the direction perpendicular to the plane of the film) are n x , n y and n z , and n x > n y > n z , with different differences; compared with the prior art where linearly polarized light becomes linearly polarized light after passing through the compensating film; in this embodiment, the linearly polarized light changes to circularly polarized light after passing through the compensating film. When subjected to external vibration, the liquid crystal molecules cannot be normally arranged, and the light will be interfered. The circularly polarized light can effectively eliminate the interference of external light, keep the brightness consistent at different viewing angles, and the displayed image will not be distorted, achieving a good anti-vibration effect.

[0041] Specifically, the compensating film is made of cyclic olefin polymer (COP) or polycarbonate material (PC). Using cyclic olefin polymer material for the compensating film is beneficial to improving the heat resistance, chemical resistance, and optical properties of the compensating film; the compensating film is made of an extensible polymer material such as polycarbonate material; according to different optical characteristics and application requirements, the compensating film can also be made of other materials.

[0042] In this embodiment, the thickness of the compensation film ranges from 20 μm to 80 μm. In practical applications, a compensation film of appropriate thickness may be selected according to optical performance to meet the requirements of display screens 100 of different specifications.

[0043] More specifically, the box thickness of the display screen 100 is 3.0μm to 5.5μm, the twist angle of the display screen 100 is 0°, and the delay amount of the display screen 100 is 280nm to 500nm. In actual applications, the parameters of the display screen 100 can be adaptively adjusted according to the adjustment of the optical elements to ensure the display performance and vibration resistance of the display screen 100 and adapt to various usage scenarios.

[0044] It should also be noted that the surface of the cover plate 2 is coated with an anti-glare coating and / or an anti-reflection layer. The anti-glare coating forms an uneven film layer on the surface of the polarizer to achieve a diffuse reflection effect and reduce brightness differences. The anti-reflection layer can meet the requirements of low reflection and high light transmittance, thereby greatly improving the readability of the display screen 100 in a strong light environment, further improving the display performance of the display screen 100, and improving the user experience.

[0045] Embodiment 2

[0046] This embodiment provides a display device, including the display screen 100 of the first embodiment, which solves the problem of distortion and low clarity of the display screen 100 under vibration, achieves good vibration resistance, and can also maintain contrast, which is 3 times higher than the contrast of the TN display screen in the prior art.

[0047] The display device of this embodiment can be any electronic device or product component with a display function, such as a navigator, a tablet computer, a laptop computer, a computer monitor, a mobile phone, a television, a display screen of a CNC machining center, etc.

[0048] Embodiment 3

[0049] This embodiment provides a display device, including the display screen 100 of the first embodiment. The display device of this embodiment is used as a vehicle-mounted display screen. The backlight 3 of the display screen 100 can be detachably connected to a vehicle structural member to achieve fixing the display screen 100 on the vehicle structural member and improve the stability of the display screen 100. The vehicle structural member can be a center console, a door panel, etc. The vehicle-mounted display screen of this embodiment can achieve good vibration resistance and maintain high contrast, and can bring a better driving experience.

[0050] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation on the present utility model.

Claims

1. A display screen, characterized in that: include: A VA liquid crystal layer, wherein the VA liquid crystal layer comprises a surface substrate, a bottom substrate, and a liquid crystal material filled between the surface substrate and the bottom substrate; A cover plate, the cover plate is arranged on one side of the surface substrate of the VA liquid crystal layer, and the cover plate is made of a transparent material; A backlight, the backlight being arranged on one side of the bottom substrate of the VA liquid crystal layer, and the backlight being used to provide a uniform light source for the VA liquid crystal layer; A polarizer is disposed between the surface substrate and the cover plate, and between the bottom substrate and the backlight, and a compensation film is disposed on the side of the polarizer facing the VA liquid crystal layer.

2. The display screen according to claim 1, characterized in that: The delay amount of the compensation film is R0=100nm~200nm, Rth=100nm~200nm; the angle between the absorption axis of the polarizer and the slow axis of the compensation film is in the range of 25°~65°; The polarizer is bonded to the VA liquid crystal layer, the polarizer bonded to the surface substrate is a surface polarizer, the polarizer bonded to the bottom substrate is a bottom polarizer, and the angle between the absorption axis of the surface polarizer and the absorption axis of the bottom polarizer is 90°±5°.

3. The display screen according to claim 2, characterized in that: The surface polarizer and the bottom polarizer are both attached with the compensation film.

4. The display screen according to any one of claims 1 to 3, characterized in that: The compensation film is a quarter-wave plate.

5. The display screen according to any one of claims 1 to 3, characterized in that: The compensation film is made of cyclic olefin polymer or polycarbonate.

6. The display screen according to any one of claims 1 to 3, characterized in that: The thickness of the compensation film ranges from 20 μm to 80 μm.

7. The display screen according to claim 1, characterized in that: The cell thickness of the display screen is 3.0 μm to 5.5 μm, the twist angle of the display screen is 0°, and the delay amount of the display screen is 280 nm to 500 nm.

8. The display screen according to claim 1, characterized in that: The surface of the cover plate is coated with an anti-glare coating and / or an anti-reflection layer.

9. A display device, characterized in that: The invention comprises the display screen according to any one of claims 1 to 8.

10. The display device according to claim 9, characterized in that: The backlight of the display screen can be detachably connected to a vehicle structure.

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