Display device and display method

• US 11,054,678 B2
• Filed: 09/26/2017
• Issued: 07/06/2021
• Est. Priority Date: 01/11/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Li, Zhongxiao, Dong, Xue, Chen, Xiaochuan, Zhao, Wenqing, Chen, Chenyu, Yang, Ming
• Primary Examiner(s): Lau, Edmond C
• Application Number:
  US15/777,233
• Publication Number:
  US 20200310172A1
• Time in Patent Office: 1,379 Days
• CPC Class Codes: G02F 1/1323 Arrangements for providing a switchable viewing angle
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/1347 Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
• CPC Class Codes: G02F 2203/62 Switchable arrangements whereby the element being usually not switchable
• CPC Class Codes: G06F 21/84 output devices, e.g. displays or monitors
• CPC Class Codes: G09G 2358/00 Arrangements for display data security
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

A display device and a display method. The display device includes an anti-peeping backlight module, a display panel and a regulator, the display panel being arranged on a light exit surface of the anti-peeping backlight module, and the anti-peeping backlight module being configured to emit an anti-peeping backlight; the display device has an anti-peeping OFF state and an anti-peeping ON state; wherein, in the anti-peeping OFF state, the regulator is configured to increase a divergence angle of the anti-peeping backlight so as to obtain divergent light; in the anti-peeping ON state, the regulator is configured to maintain the divergence angle of the anti-peeping backlight so as to obtain anti-peeping light. The display device and display method provided in this text can enable switching between normal display mode and an anti-peeping display mode to facilitate safe display of the display device.

Claims

1. A display device, comprising:

an anti-peeping backlight module,

a display panel, and

a regulator comprising a first substrate, a second substrate, a liquid crystal layer that is disposed between the first substrate and the second substrate, a first electrode that is arranged between the liquid crystal layer and the first substrate, a second electrode that is arranged between the first electrode and the first substrate, the first electrode and the second electrode being insulated from each other;

wherein the display panel is arranged on a light exit surface of the anti-peeping backlight module,

wherein the anti-peeping backlight module is configured to emit an anti-peeping backlight, and

wherein the display device has an anti-peeping OFF state and an anti-peeping ON state,

wherein, in the anti-peeping OFF state, liquid crystal molecules in the liquid crystal layer deflect under an effect of the electric field force so as to increase a divergence angle of the anti-peeping backlight to obtain a divergent light;

wherein, in the anti-peeping ON state, the liquid crystal molecules in the liquid crystal layer do not deflect so as to maintain the divergence angle of the anti-peeping backlight to obtain an anti-peeping light;

wherein the regulator further comprises a square wave drive circuit connected to the first electrode, and a DC drive circuit connected to the second electrode;

wherein the square wave drive circuit is configured to provide a square wave drive signal to the first electrode, and wherein the DC drive circuit is configured to provide a DC drive signal to the second electrode;

wherein in the anti-peeping OFF state, a liquid crystal driving voltage V_op satisfies the equation of V_op=V_max−

V_com=V_com−

V_min, wherein V_max is a maximum voltage of the square wave drive signal, V_min is a minimum voltage of the square wave drive signal, and V_com is a voltage of the DC drive signal; and

wherein in the anti-peeping ON state, the liquid crystal driving voltage V_op and the voltage V_com of the DC drive signal are both zero.

2. The display device according to claim 1, wherein the first electrode comprises a plurality of strip electrodes, which are arranged in parallel with equal intervals between each, and the second electrode is a planar electrode.

3. The display device according to claim 2, wherein the interval between adjacent strip electrodes is 3 μ

m-10 μ

m, and a width of each strip electrode is 1 μ

m-5 μ

m.

4. The display device according to claim 1, wherein a refractive index difference of the liquid crystal layer is greater than or equal to 0.3.

5. The display device according to claim 1, wherein the anti-peeping backlight module further comprises a backlight and a collimator, and wherein the collimator is arranged on a light exit surface of the backlight, and the collimator is configured to reduce the divergence angle of the backlight so as to obtain the anti-peeping backlight.

6. The display device according to claim 1, wherein in when liquid crystal molecules in the liquid crystal layer are not deflected, an initial orientation of the liquid crystal molecules is parallel to a plane of the first substrate and parallel to an extension direction of the first electrode.

7. A display method applied to the display device according to claim 1, comprising:

determining a state of the display device;

if the display device is in the anti-peeping OFF state, emitting the anti-peeping backlight by the anti-peeping backlight module, and increasing the divergence angle of the anti-peeping backlight using the regulator so as to obtain the divergent light;

if the display device is in the anti-peeping ON state, emitting the anti-peeping backlight by the anti-peeping backlight module, and maintaining the divergence angle of the anti-peeping backlight using the regulator so as to obtain the anti-peeping light.

8. The display method according to claim 7,

wherein

said increasing the divergence angle of the anti-peeping backlight using the regulator so as to obtain the divergent light comprises:

controlling deflection states of the liquid crystals using the first electrode and the second electrode, so that the liquid crystals deflect so as to increase the divergence angle of the anti-peeping backlight to obtain the divergent light;

said maintaining the divergence angle of the anti-peeping backlight using the regulator so as to obtain the anti-peeping light comprises;

controlling deflection states of the liquid crystals using the first electrode and the second electrode, so that the liquid crystals do not deflect so as to maintain the divergence angle of the anti-peeping backlight to obtain the anti-peeping light.

9. The display device according to claim 1, wherein in the case where liquid crystals in the liquid crystal layer are not deflected, an initial orientation of the liquid crystals is parallel to a plane of the first substrate and perpendicular to an extension direction of the first electrode.

10. A display device, comprising:

an anti-peeping backlight module,

a display panel, and

a regulator comprising a first substrate, a second substrate, a liquid crystal layer that is disposed between the first substrate and the second substrate, a first electrode that is arranged between the liquid crystal layer and the first substrate;

wherein the display panel is arranged on a light exit surface of the anti-peeping backlight module,

wherein the anti-peeping backlight module is configured to emit an anti-peeping backlight, and

wherein the display device has an anti-peeping OFF state and an anti-peeping ON state,

wherein, in the anti-peeping OFF state, liquid crystal molecules in the liquid crystal layer deflect under an effect of the electric field force so as to increase a divergence angle of the anti-peeping backlight to obtain a divergent light;

wherein, in the anti-peeping ON state, the liquid crystal molecules in the liquid crystal layer do not deflect so as to maintain the divergence angle of the anti-peeping backlight obtain an anti-peeping light;

wherein the first electrode comprises a plurality of strip electrodes, which are arranged in parallel with equal intervals between each;

wherein the regulator further comprises a first drive circuit connected to the first electrode, and a second drive circuit connected to the second electrode;

wherein the first drive circuit is configured to provide a first drive signal to the first electrode, and wherein the second circuit is configured to provide a second drive signal to the second electrode;

wherein one of two adjacent strip electrodes is connected to the first drive circuit, and the other is connected to the second drive circuit;

wherein the first drive circuit supplies the first drive signal to the correspondingly connected strip electrode;

wherein the second drive circuit supplies the second drive signal to the correspondingly connected strip electrode; and

wherein

in the anti-peeping OFF state, a voltage V₁ of the first drive signal and a voltage V₂ of the second drive signal satisfy V_op=|V₁−

V₂|>

0, wherein V_op is a liquid crystal driving voltage; and

in the anti-peeping ON state, the voltage V₁ of the first drive signal and the voltage V₂ of the second drive signal satisfy V_op=|V₁−

V₂|=0.

11. The display device according to claim 10, wherein the interval between adjacent strip electrodes is 3 μ

m-5 μ

m, and a width of each strip electrode is 1 μ

m-2.5 μ

m.

12. The display device according to claim 10, wherein a refractive index difference of the liquid crystal layer is greater than or equal to 0.3.

13. The display device according to claim 10, wherein the anti-peeping backlight module further comprises a backlight and a collimator, and wherein the collimator is arranged on a light exit surface of the backlight, and the collimator is configured to reduce the divergence angle of the backlight so as to obtain the anti-peeping backlight.

14. The display device according to claim 10, wherein in when liquid crystal molecules in the liquid crystal layer are not deflected, an initial orientation of the liquid crystal molecules is parallel to a plane of the first substrate and parallel to an extension direction of the first electrode.

15. The display device according to claim 10, wherein in the case where liquid crystal molecules in the liquid crystal layer are not deflected, an initial orientation of the liquid crystals is parallel to a plane of the first substrate and perpendicular to an extension direction of the first electrode.

16. A display method applied to the display device according to claim 10, comprising:

determining a state of the display device;

if the display device is in the anti-peeping OFF state, emitting the anti-peeping backlight by the anti-peeping backlight module, and increasing the divergence angle of the anti-peeping backlight using the regulator so as to obtain the divergent light;

if the display device is in the anti-peeping ON state, emitting the anti-peeping backlight by the anti-peeping backlight module, and maintaining the divergence angle of the anti-peeping backlight using the regulator so as to obtain the anti-peeping light.

17. The display method according to claim 16, wherein:

said increasing the divergence angle of the anti-peeping backlight using the regulator so as to obtain the divergent light comprises;

controlling deflection states of the liquid crystals using the first electrode, so that the liquid crystals deflect so as to increase the divergence angle of the anti-peeping backlight to obtain the divergent light;

said maintaining the divergence angle of the anti-peeping backlight using the regulator so as to obtain the anti-peeping light comprises;

controlling deflection states of the liquid crystals using the first electrode, so that the liquid crystals do not deflect so as to maintain the divergence angle of the anti-peeping backlight to obtain the anti-peeping light.