A display device with one-side controllable anti-peep function

Abstract

The utility model relates to a kind of display devices of unilateral controllable peep-proof function, including mutually superposed display component and peep-proof component;Peep-proof component includes first polaroid, first liquid crystal box, second polaroid, second liquid crystal box and third polaroid, first liquid crystal box is between first polaroid and second polaroid, second liquid crystal layer is between second polaroid and third polaroid;The polarizing axis of first polaroid is along first axial direction;The polarizing axis of second polaroid and third polaroid is along with the second axial direction that first axial direction is orthogonal;First liquid crystal box has first liquid crystal layer, and the liquid crystal molecule of first liquid crystal layer has from first angle to second angle first twist angle;Second liquid crystal box has second liquid crystal layer, and the liquid crystal molecule of second liquid crystal layer has from third angle to fourth angle second twist angle;First angle and third angle are in first axial direction, and the second angle and fourth angle are in second axial direction, and the orientation of first twist angle and second twist angle is opposite.

Description

Technical Field

[0001] This utility model relates to the field of display devices, and more specifically, to a display device with a one-sided controllable privacy protection function. Background Technology

[0002] The controllable privacy display device can switch between a non-privacy mode and a privacy mode as needed. In the non-privacy mode, the display can be viewed not only by users at a vertical or central viewing angle, but also by users at an angle. In the privacy mode, the display is controlled to be invisible to users at a certain angle.

[0003] Privacy screens are typically installed on the front passenger side of a car. They activate during driving to prevent the driver from viewing the screen, thus improving driving focus and safety. Therefore, car privacy screens generally require only one-sided privacy protection.

[0004] However, current controllable privacy devices typically provide privacy from both sides when in privacy mode, which does not match the current requirement for single-sided privacy in automobiles.

[0005] In addition, current privacy devices affect the color tone of the displayed image. Therefore, it is necessary to propose a display device with a single-sided controllable privacy function to solve the above problems. Utility Model Content

[0006] To overcome at least one of the defects (deficiencies) of the prior art described above, this utility model provides a display device with a single-sided controllable privacy function.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a display device with a single-sided controllable privacy function, comprising a display component and a privacy component stacked on top of each other;

[0008] The privacy protection component includes a first polarizer, a first liquid crystal cell, a second polarizer, a second liquid crystal cell, and a third polarizer, wherein the first liquid crystal cell is located between the first polarizer and the second polarizer, and the second liquid crystal layer is located between the second polarizer and the third polarizer.

[0009] The polarization axis of the first polarizer is along a first axial direction; the polarization axes of the second and third polarizers are along a second axial direction orthogonal to the first axial direction.

[0010] The first liquid crystal cell has a first liquid crystal layer, and the liquid crystal molecules of the first liquid crystal layer have a first twist angle from a first angle to a second angle;

[0011] The second liquid crystal cell has a second liquid crystal layer, and the liquid crystal molecules of the second liquid crystal layer have a second twist angle from a third angle to a fourth angle;

[0012] The first and third angles are both located along the first axis, and the second and fourth angles are both located along the second axis. The first and second twist angles are oriented in opposite directions. No voltage is applied to the electrodes of the first liquid crystal cell, and its liquid crystal molecules are in a TN twisted state. Each viewing angle has a light rotation effect on linearly polarized light. Since the polarization axes of the first and second polarizers are perpendicular to each other, there is high transmittance at each viewing angle. A second voltage is applied to the electrodes of the second liquid crystal cell, and its liquid crystal molecules are in a vertical or relatively vertical alignment state. Each viewing angle has a relatively consistent and small impact on the polarization state of linearly polarized light. Since the polarization axes of the second and third polarizers are parallel to each other, there is also high transmittance at each viewing angle. Therefore, the superposition of the first and second liquid crystal cells has a small impact on the brightness of the display screen of the display component, and the viewing angles are uniform. The display state is in a non-peeping state.

[0013] In the privacy mode, a first voltage is applied to the electrodes of both the first and second liquid crystal cells. When driven by the first voltage, the liquid crystal molecules of the first liquid crystal layer are arranged at a relatively tilted angle toward the first tilted viewing angle. At this time, the electric vector of the polarized light incident on the first tilted viewing angle has a small angle with the liquid crystal molecules, so its polarization state does not change significantly. Since the polarization axes of the first and second polarizers are perpendicular to each other, the transmittance at the first viewing angle is low, while the transmittance at other viewing angles is high.

[0014] The liquid crystal molecules in the second liquid crystal layer are arranged at a more tilted angle toward the second tilted viewing angle. At this angle, the electric vector of the polarized light incident on the first tilted viewing angle has a larger angle with the liquid crystal molecules, thus experiencing a more significant optical rotation effect from the TN liquid crystal layer. This causes the polarization state to tend to rotate by 90°. Since the polarization axes of the second and third polarizers are parallel, the transmittance at the first tilted viewing angle is also lower, while the transmittance at other viewing angles is higher. Therefore, the superposition of the first and second liquid crystal cells significantly reduces the brightness of the displayed image at the first viewing angle, but does not affect the brightness at other viewing angles. The displayed image is not clearly visible from the first viewing angle, thus achieving unilateral privacy protection. In addition to the effect of the first and second liquid crystal layers, the superposition of these layers achieves a complementary color tone effect at various viewing angles, ensuring that the colors of the image do not change significantly from different viewing angles. Even in privacy mode, the brightness change is mainly observed on one side of the screen, with minimal impact on the displayed color. In this invention, when a voltage is applied, the liquid crystal molecules deflect, increasing their tilt angle from the pretilt angle to nearly 90°. Therefore, the first voltage can be defined as the voltage range where the liquid crystal molecules are tilted at 30°–70° (a relatively tilted state), and the second voltage is the voltage range where the liquid crystal molecules are tilted at 70°–90° (a relatively vertical state). In actual liquid crystal cells, the first voltage is typically 1–4V, and the second voltage is above 4V.

[0015] Furthermore, both the first liquid crystal layer and the second liquid crystal layer are TN liquid crystal layers.

[0016] Furthermore, the display component is an active light-emitting display.

[0017] Furthermore, the display component is a TFT cell with a fourth polarizer on the side away from the privacy screen component, and the TFT cell is equipped with a backlight.

[0018] Furthermore, both the first and second liquid crystal cells are composed of an outer glass substrate and an inner glass substrate sandwiching a liquid crystal layer. The inner and outer glass substrates are bonded together with adhesive rings to seal the liquid crystal layer.

[0019] Furthermore, the inner and outer glass substrates are respectively provided with an inner transparent electrode and an outer transparent electrode on their inner surfaces. The surfaces of the inner and outer transparent electrodes are provided with a horizontal alignment layer that has been oriented and rubbed. The liquid crystal layer is a positive nematic liquid crystal.

[0020] Furthermore, the display component, the first polarizer, the first liquid crystal cell, the second polarizer, the second liquid crystal cell, and the third polarizer are all bonded together with a transparent adhesive layer.

[0021] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0022] The single-sided controllable privacy-protecting display device disclosed in this utility model has the following characteristics: No voltage is applied to the electrodes of the first liquid crystal cell, and its liquid crystal molecules are in a TN twisted state. Each viewing angle exhibits optical rotation on linearly polarized light. Since the polarization axes of the first and second polarizers are perpendicular to each other, high transmittance is achieved at all viewing angles. A second voltage is applied to the electrodes of the second liquid crystal cell, and its liquid crystal molecules are in a vertical or relatively vertical alignment. The effect of each viewing angle on the polarization state of linearly polarized light is relatively consistent and minimal. Since the polarization axes of the second and third polarizers are parallel to each other, high transmittance is also achieved at all viewing angles. Therefore, the superposition of the first and second liquid crystal cells has a minimal impact on the brightness of the displayed image, and the viewing angles are uniform, resulting in a non-privacy-protecting display state.

[0023] In the privacy mode, a first voltage is applied to the electrodes of both the first and second liquid crystal cells. When driven by the first voltage, the liquid crystal molecules of the first liquid crystal layer are aligned at a relatively tilted angle towards the first tilted viewing angle. At this time, the electric vector of the polarized light incident on the first tilted viewing angle has a small angle with the liquid crystal molecules, so its polarization state does not change significantly. Since the polarization axes of the first and second polarizers are perpendicular to each other, the transmittance at the first viewing angle is low, while the transmittance at other viewing angles is high. The liquid crystal molecules of the second liquid crystal layer are aligned at a relatively tilted angle towards the second tilted viewing angle. At this time, the electric vector of the polarized light incident on the first tilted viewing angle has a large angle with the liquid crystal molecules, so it will be subject to a more significant optical rotation effect of the TN liquid crystal layer, causing its polarization state to tend to change. When the polarization axes of the second and third polarizers are parallel, the transmittance at the first tilt angle is lower, while the transmittance at other angles is higher. Thus, the superposition of the first and second liquid crystal cells significantly reduces the brightness of the display screen at the first angle, but does not affect the brightness at other angles. The display screen is not clearly visible from the first angle, thus achieving a one-sided privacy protection effect. In addition, the superposition of the first and second liquid crystal layers can achieve a color complementary effect at various angles when they are working, so that the color of the screen does not change significantly at different angles. In the privacy protection state, the brightness change is mainly on one side of the screen, and the color of the display screen is not significantly affected. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the display device in this utility model.

[0025] Figure 2 This is a schematic diagram of the optical axis angle of the display device in this utility model.

[0026] Figure 3 This is a schematic diagram of the arrangement of liquid crystal molecules in the first or second liquid crystal cell of this utility model under different voltages.

[0027] Figure 4 This is the first liquid crystal cell in this utility model, and its liquid crystal molecules are at zero voltage (non-peeping mode), showing the arrangement of liquid crystal molecules when viewed from different angles.

[0028] Figure 5 This is a schematic diagram of the liquid crystal molecule arrangement in the second liquid crystal cell of this utility model when viewed from different angles under a second voltage (non-peeping mode).

[0029] Figure 6 This is a schematic diagram of the liquid crystal molecule arrangement of the first liquid crystal cell in this utility model when viewed from different angles under a first voltage (peeping mode).

[0030] Figure 7This is a schematic diagram of the liquid crystal molecule arrangement in the second liquid crystal cell of this utility model when viewed from different angles under the first voltage (peeping mode).

[0031] Figure 8 This is an equal contrast diagram of an embodiment of a display device in a non-peeping mode.

[0032] Figure 9 This is an equal contrast diagram of an embodiment of a display device in privacy mode.

[0033] In the figure, 1 is the display component, 2 is the first polarizer, 3 is the first liquid crystal cell, 4 is the second polarizer, 5 is the second liquid crystal cell, 6 is the third polarizer, 7 is the fourth polarizer, and 8 is the back. Detailed Implementation

[0034] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can be described as the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0036] like Figure 1-9As shown, a display device with a unilaterally controllable privacy function includes a display component 1 and a privacy component stacked on top of each other; the privacy component includes a first polarizer 2, a first liquid crystal cell 3, a second polarizer 4, a second liquid crystal cell 5, and a third polarizer 6, wherein the first liquid crystal cell is located between the first polarizer and the second polarizer, and the second liquid crystal layer is located between the second polarizer and the third polarizer; the polarization axis of the first polarizer is along a first axial direction; the polarization axes of the second polarizer and the third polarizer are along a second axial direction orthogonal to the first axial direction; the first liquid crystal cell has a first liquid crystal layer, and the liquid crystal molecules of the first liquid crystal layer have a first twist angle from a first angle to a second angle; the second liquid crystal cell has a second liquid crystal layer, and the liquid crystal molecules of the second liquid crystal layer have a second twist angle from a third angle to a fourth angle; the first angle and the third angle... The first and second twist angles are both located along the first axis, while the second and fourth twist angles are both located along the second axis. The first and second twist angles are oriented in opposite directions. No voltage is applied to the electrodes of the first liquid crystal cell, and its liquid crystal molecules are in a TN twisted state. Each viewing angle has an optical rotation effect on linearly polarized light. Since the polarization axes of the first and second polarizers are perpendicular to each other, they have high transmittance at each viewing angle. A second voltage is applied to the electrodes of the second liquid crystal cell, and its liquid crystal molecules are in a vertical or relatively vertical alignment state. Each viewing angle has a relatively consistent and small impact on the polarization state of linearly polarized light. Since the polarization axes of the second and third polarizers are parallel to each other, they also have high transmittance at each viewing angle. Therefore, the superposition of the first and second liquid crystal cells has a small impact on the brightness of the display screen of the display component, and the viewing angles are uniform. The display state is in a non-peeping state.

[0037] In the privacy mode, a first voltage is applied to the electrodes of both the first and second liquid crystal cells. When driven by the first voltage, the liquid crystal molecules of the first liquid crystal layer are arranged at a relatively tilted angle toward the first tilted viewing angle. At this time, the electric vector of the polarized light incident on the first tilted viewing angle has a small angle with the liquid crystal molecules, so its polarization state does not change significantly. Since the polarization axes of the first and second polarizers are perpendicular to each other, the transmittance at the first viewing angle is low, while the transmittance at other viewing angles is high.

[0038] The liquid crystal molecules in the second liquid crystal layer are arranged at a more tilted angle toward the second tilted viewing angle. At this angle, the electric vector of the polarized light incident on the first tilted viewing angle has a larger angle with the liquid crystal molecules, thus experiencing a more significant optical rotation effect from the TN liquid crystal layer. This causes the polarization state to tend to rotate by 90°. Since the polarization axes of the second and third polarizers are parallel, the transmittance at the first tilted viewing angle is also lower, while the transmittance at other viewing angles is higher. Therefore, the superposition of the first and second liquid crystal cells significantly reduces the brightness of the displayed image at the first viewing angle, but does not affect the brightness at other viewing angles. The displayed image is not clearly visible from the first viewing angle, thus achieving unilateral privacy protection. In addition to the effect of the first and second liquid crystal layers, the superposition of these layers achieves a complementary color tone effect at various viewing angles, ensuring that the colors of the image do not change significantly from different viewing angles. Even in privacy mode, the brightness change is mainly observed on one side of the screen, with minimal impact on the displayed color. In this invention, when a voltage is applied, the liquid crystal molecules deflect, increasing their tilt angle from the pretilt angle to nearly 90°. Therefore, the first voltage can be defined as the voltage range where the liquid crystal molecules are tilted at 30°–70° (a relatively tilted state), and the second voltage is the voltage range where the liquid crystal molecules are tilted at 70°–90° (a relatively vertical state). In actual liquid crystal cells, the first voltage is typically 1–4V, and the second voltage is above 4V.

[0039] In this invention, both the first and second liquid crystal layers are TN liquid crystal layers. The display component is an active light-emitting display. In this invention, the display component is a TFT cell with a fourth polarizer 7 on the side away from the privacy screen component. The TFT cell has a backlight 8. Both the first and second liquid crystal cells are composed of an outer glass substrate and an inner glass substrate sandwiching a liquid crystal layer. The inner and outer glass substrates are bonded together and sealed with adhesive rings. In this invention, the inner and outer glass substrates are respectively provided with an inner transparent electrode and an outer transparent electrode. The surfaces of the inner and outer transparent electrodes are provided with a horizontal alignment layer that has been oriented and rubbed. The liquid crystal layer is a positive nematic liquid crystal. The display component, the first polarizer, the first liquid crystal cell, the second polarizer, the second liquid crystal cell, and the third polarizer are all bonded together with a transparent adhesive layer.

[0040] The positional relationships described in the figures are for illustrative purposes only and should not be construed as limiting this patent. Clearly, the above embodiments of this utility model are merely examples to clearly illustrate the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A display device with a one-sided controllable privacy function, characterized in that: This includes overlapping display components and privacy screen components; The privacy protection component includes a first polarizer, a first liquid crystal cell, a second polarizer, a second liquid crystal cell, and a third polarizer, wherein the first liquid crystal cell is located between the first polarizer and the second polarizer, and the second liquid crystal layer is located between the second polarizer and the third polarizer. The polarization axis of the first polarizer is along a first axial direction; the polarization axes of the second and third polarizers are along a second axial direction orthogonal to the first axial direction. The first liquid crystal cell has a first liquid crystal layer, and the liquid crystal molecules of the first liquid crystal layer have a first twist angle from a first angle to a second angle; The second liquid crystal cell has a second liquid crystal layer, and the liquid crystal molecules of the second liquid crystal layer have a second twist angle from a third angle to a fourth angle; The first angle and the third angle are both located along the first axis, the second angle and the fourth angle are both located along the second axis, and the first twist angle and the second twist angle are oriented in opposite directions.

2. The display device with unilateral controllable privacy function according to claim 1, characterized in that: Both the first liquid crystal layer and the second liquid crystal layer are TN liquid crystal layers.

3. The display device with unilateral controllable privacy function according to claim 1, characterized in that: The display component is an active light-emitting display.

4. The display device with unilateral controllable privacy function according to claim 1, characterized in that: The display component is a TFT cell with a fourth polarizer on the side away from the privacy screen component, and the TFT cell is equipped with a backlight.

5. The display device with unilateral controllable privacy function according to claim 1, characterized in that: Both the first and second liquid crystal cells are composed of an outer glass substrate and an inner glass substrate sandwiching a liquid crystal layer. The inner and outer glass substrates are bonded together with a rubber ring to seal the liquid crystal layer.

6. The display device with unilateral controllable privacy function according to claim 5, characterized in that: The inner and outer glass substrates are respectively provided with an inner transparent electrode and an outer transparent electrode. The surfaces of the inner and outer transparent electrodes are provided with a horizontal alignment layer that has been oriented and rubbed. The liquid crystal layer is a positive nematic liquid crystal.

7. The display device with unilateral controllable privacy function according to claim 1, characterized in that: The display component, the first polarizer, the first liquid crystal cell, the second polarizer, the second liquid crystal cell, and the third polarizer are all bonded together with a transparent adhesive layer.

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