Adjustable peep-proof display screen

Abstract

The utility model relates to an adjustable peep-proof display screen which comprises a display, a liquid crystal box and a first polaroid, the liquid crystal box is arranged on the front side of the display, the first polaroid is arranged on the front side of the liquid crystal box, and the adjustable peep-proof display screen is characterized in that the display adopts a TFT (thin film transistor) display which emits polarized light in the Y-axis direction; the liquid crystal box is a VA liquid crystal box; the first polaroid is a Z-axis polaroid. The adjustable peep-proof display screen has an adjusting function and can be conveniently switched into a peep-proof state or a public state.

Description

Technical Field

[0001] The utility model relates to the technical field of display screens, in particular to an adjustable anti-peeping display screen. Background Art

[0002] At present, most cars have only one screen in the car. In order to prevent the driver from watching videos while driving, the entertainment system will disable the video playback function while driving. With the continuous development of automobile technology, users have higher and higher requirements for the car experience. In order to meet the needs of users on the co-pilot side, with the enrichment of entertainment functions, the co-pilot has also begun to be equipped with an entertainment system, and videos can still be played while driving. In this case, the driver may watch the video on the co-pilot seat while driving, which poses a great safety hazard. The current solution is to use an anti-peep display screen and sacrifice some viewing angles. The purpose is not to protect privacy, but to prevent the driver from watching the co-pilot side screen while driving and causing accidents. The possibility of the driver watching the video is eliminated, which plays an active anti-peeping role and reduces the interference of the co-pilot screen to the driver during the driving of the car.

[0003] However, the current anti-peep display screen does not have an adjustment function. When the vehicle is parked for rest, the driver still cannot see the screen on the passenger seat and cannot share videos. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an adjustable anti-peeping display screen, which has an adjustment function and can be easily switched to an anti-peeping state or a public state. The technical solution adopted is as follows:

[0005] An adjustable anti-peeping display screen includes a display, a liquid crystal box and a first polarizer, wherein the liquid crystal box is arranged on the front side of the display, and the first polarizer is arranged on the front side of the liquid crystal box, and is characterized in that: the display adopts a TFT display, and the TFT display emits polarized light in the Y-axis direction; the liquid crystal box adopts a VA liquid crystal box; and the first polarizer adopts a Z-axis polarizer.

[0006] The above-mentioned adjustable anti-peeping display screen is mainly used on the co-pilot display screen to play an active anti-peeping role, reducing the interference of the co-pilot screen to the driver during vehicle driving. The front and rear mentioned in this manual refer to: the side close to the co-pilot is the front, and the side away from the co-pilot is the rear.

[0007] In the above-mentioned adjustable anti-peeping display screen, the Z-axis polarizer has an absorption effect on the Z-axis electric vector of the light, so that the larger the angle between the light and the first polarizer, the greater the polarization absorption; the VA liquid crystal box is a liquid crystal box in a vertical alignment mode. When the liquid crystal box is not powered on and is in the OFF state, the polarized light in the Y-axis direction emitted by the TFT display does not change in optical path difference when passing through the VA liquid crystal box, and the polarization state does not change. When looking left and right, the polarized light in the Y-axis direction is at an angle of 90° along the Z-axis, so that the screen of the adjustable anti-peeping display screen is in a dark anti-peeping state; when the liquid crystal box is powered on and is in the ON state, the VA liquid crystal box has the function of a half-wave plate, and the polarized light emitted by the TFT display changes from the Y-axis direction to the X-axis direction, so that the Z-axis polarizer has no effect on it, so that the screen of the adjustable anti-peeping display screen is in a bright state and not anti-peeping state, and when the vehicle is parked, the driver and the co-pilot can watch the display content together.

[0008] As a preferred embodiment of the present invention, the Z-axis polarizer adopts a Z-axis dye film, which has dye molecules extending along the Z-axis. The Z-axis dye film has dye molecules extending along the Z-axis, and the dye molecules have an absorption effect on the Z-axis electric vector of the light, so that the greater the angle between the light and the first polarizer, the greater the polarization absorption.

[0009] As a preferred embodiment of the utility model, the VA liquid crystal box comprises a first transparent substrate, a liquid crystal layer and a second transparent substrate arranged in sequence from back to front, the liquid crystal layer is sandwiched between the first transparent substrate and the second transparent substrate, and the liquid crystal layer is composed of negative liquid crystal; a first transparent electrode and a first alignment layer are arranged on the side of the first transparent substrate close to the liquid crystal layer, a second transparent electrode and a second alignment layer are arranged on the side of the second transparent substrate close to the liquid crystal layer, and an electrode overlap region exists between the second transparent electrode and the first transparent electrode to form a light control region. The negative liquid crystal is a nematic liquid crystal whose liquid crystal molecules tend to be perpendicular to the electric field when subjected to an electric field, so that in a non-powered state, the liquid crystal molecules in the liquid crystal layer are arranged vertically, and the first alignment layer and the second alignment layer are subjected to directional friction, so that in a powered state, the liquid crystal layer is arranged horizontally at an orientation angle (first angle).

[0010] As a further preferred solution of the present invention, the first transparent substrate and the second transparent substrate are glass substrates.

[0011] As a further preferred solution of the present invention, the first transparent electrode and the second transparent electrode are formed by patterning a transparent conductive film (such as an ITO film).

[0012] As a further preferred embodiment of the present invention, both the first alignment layer and the second alignment layer are vertical alignment layers (such as vertical alignment polyimide coatings).

[0013] As a further preferred embodiment of the present invention, the optical path difference of the liquid crystal layer is 290 nm.

[0014] As a further preferred embodiment of the present invention, a second polarizer is provided on the front side of the display. The second polarizer can convert the light emitted by the display into linear polarized light of a second angle. Generally, the included angle between the second angle and the first angle is 45°, and the included angle between the second angle and the left and right viewing angles is 90°.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] (1) This adjustable anti-peeping display screen is mainly used on the co-pilot display screen, and can be switched between anti-peeping state and public state through operation: it can be switched to anti-peeping state while the vehicle is driving to reduce the interference of the co-pilot screen on the driver; when the vehicle is parked, the anti-peeping screen can be switched to public state, so that the driver and the co-pilot can watch the display content together;

[0017] (2) This adjustable anti-peeping screen can also be divided into different areas for anti-peeping, so that part of the display is anti-peeping to the driver and part is open to the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an adjustable anti-peeping display screen according to a preferred embodiment of the utility model.

[0019] Figure 2 It is a schematic diagram of the state of the liquid crystal box in the preferred embodiment of the utility model in the OFF state.

[0020] Figure 3 It is a schematic diagram of the state of the liquid crystal box in the preferred embodiment of the utility model in the ON state.

[0021] Figure 4 yes Figure 1 The viewing angle diagram of the adjustable anti-peeping display screen when the liquid crystal cell is in the ON state.

[0022] Figure 5 yes Figure 1 The viewing angle diagram of the adjustable privacy display screen when the liquid crystal cell is in the OFF state. DETAILED DESCRIPTION

[0023] like Figure 1-Figure 5 As shown, the adjustable anti-peeping display screen includes a TFT display 1, a VA liquid crystal box 2 and a Z-axis polarizer 3. The TFT display 1 emits polarized light in the Y-axis direction, the VA liquid crystal box 2 is arranged on the front side of the TFT display 1, and the Z-axis polarizer 3 is arranged on the front side of the VA liquid crystal box 2.

[0024] In this embodiment, the Z-axis polarizer 3 uses a Z-axis dye film, which has dye molecules extending along the Z axis. The Z-axis dye film has dye molecules extending along the Z axis, and the dye molecules have an absorption effect on the Z-axis electric vector of the light, so that the greater the angle between the light and the first polarizer 3, the greater the polarization absorption.

[0025] The VA liquid crystal cell 2 comprises a first transparent substrate 21, a liquid crystal layer 22 and a second transparent substrate 23 which are arranged in sequence from back to front. The liquid crystal layer 22 is sandwiched between the first transparent substrate 21 and the second transparent substrate 23. The liquid crystal layer 22 is composed of negative liquid crystal. A first transparent electrode 24 and a first alignment layer 25 are provided on the side of the first transparent substrate 21 close to the liquid crystal layer 22. A second transparent electrode 26 and a second alignment layer 27 are provided on the side of the second transparent substrate 23 close to the liquid crystal layer 22. There is an electrode overlap region between the second transparent electrode 26 and the first transparent electrode 24 to form a light control region. Negative liquid crystal is a nematic liquid crystal whose liquid crystal molecules tend to be perpendicular to the electric field when subjected to an electric field. Therefore, in a non-powered state, the negative liquid crystal molecules 221 in the liquid crystal layer 22 are arranged vertically. The first alignment layer 25 and the second alignment layer 27 are oriented and rubbed so that in a powered state, the liquid crystal layer 22 is arranged horizontally at an orientation angle (first angle).

[0026] In this embodiment, the first transparent substrate 21 and the second transparent substrate 23 are glass substrates; the first transparent electrode 24 and the second transparent electrode 26 are formed by patterning a transparent conductive film (such as an ITO film).

[0027] In this embodiment, the first alignment layer 25 and the second alignment layer 27 are both vertical alignment layers (such as vertical alignment polyimide coatings).

[0028] In this embodiment, the optical path difference of the liquid crystal layer 22 is 290 nm.

[0029] In this embodiment, a second polarizer 4 is disposed on the front side of the TFT display 1. The second polarizer 4 can convert the light emitted by the TFT display 1 into linear polarized light of a second angle (the included angle between the second angle and the first angle is 45°, and the included angle between the second angle and the left and right viewing angles is 90°).

[0030] Here’s a quick rundown of how this adjustable privacy screen works:

[0031] This adjustable anti-peeping display screen is used on the co-pilot display screen. The Z-axis polarizer 3 has an absorption effect on the Z-axis electric vector of the light, so that the larger the angle between the light and the first polarizer 3, the greater the polarization absorption; the VA liquid crystal box 2 is a liquid crystal box in a vertical alignment mode. When the VA liquid crystal box 2 is not powered on and is in the OFF state, the polarized light in the Y-axis direction emitted by the TFT display 1 does not have an optical path difference change when passing through the VA liquid crystal box 2, and the polarization state does not change. When looking left and right, the polarized light in the Y-axis direction is at an angle of 90° along the Z-axis, so that the screen of the adjustable anti-peeping display screen is in a dark anti-peeping state; when the VA liquid crystal box 2 is powered on and is in the ON state, the VA liquid crystal box 2 has the function of a half-wave plate, and the polarized light emitted by the TFT display 1 changes from the Y-axis direction to the X-axis direction, so that the Z-axis polarizer 3 has no effect on it, so that the screen of the adjustable anti-peeping display screen is in a bright state and not anti-peeping state. When the vehicle is parked, the driver can watch the content of the TFT display 1 together with the co-pilot.

[0032] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles of the utility model patent are included in the protection scope of the utility model patent. The technical personnel in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. An adjustable anti-peeping display screen, comprising a display, a liquid crystal box and a first polarizer, wherein the liquid crystal box is arranged in front of the display, and the first polarizer is arranged in front of the liquid crystal box, characterized in that: The display is a TFT display, which emits polarized light in the Y-axis direction; the liquid crystal box is a VA liquid crystal box; and the first polarizer is a Z-axis polarizer.

2. The adjustable anti-peeping display screen according to claim 1, characterized in that: The Z-axis polarizer uses a Z-axis dye film having dye molecules extending along the Z-axis.

3. The adjustable anti-peeping display screen according to claim 1 or 2, characterized in that: The VA liquid crystal box includes a first transparent substrate, a liquid crystal layer and a second transparent substrate which are arranged in sequence from back to front, wherein the liquid crystal layer is sandwiched between the first transparent substrate and the second transparent substrate, and the liquid crystal layer is composed of negative liquid crystal; a first transparent electrode and a first alignment layer are arranged on the side of the first transparent substrate close to the liquid crystal layer, and a second transparent electrode and a second alignment layer are arranged on the side of the second transparent substrate close to the liquid crystal layer, and an electrode overlapping area is provided between the second transparent electrode and the first transparent electrode to form a light control area.

4. The adjustable anti-peeping display screen according to claim 3, characterized in that: The first transparent substrate and the second transparent substrate are glass substrates.

5. The adjustable anti-peeping display screen according to claim 3, characterized in that: The first transparent electrode and the second transparent electrode are formed by patterning a transparent conductive film.

6. The adjustable anti-peeping display screen according to claim 3, characterized in that: The first alignment layer and the second alignment layer are both vertical alignment layers.

7. The adjustable anti-peeping display screen according to claim 3, characterized in that: The optical path difference of the liquid crystal layer is 290 nm.

8. The adjustable anti-peeping display screen according to claim 3, characterized in that: A second polarizer is disposed on the front side of the display.

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