Display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-9846320-B2
Application number	US-201414652983-A
Country	US
Kind code	B2
Filing date	Dec 4, 2014
Priority date	Jul 10, 2014
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A display device and driving method thereof are disclosed. The display device includes a display screen, including a plurality of sub-pixels arranged in the form of a matrix, colors of the sub-pixels in the same column including all colors necessary for display by the display screen; a grating disposed on top of the display screen, including light-transmissive regions and light-shading regions that are arranged alternately, the light-transmissive regions being in parallel to each column of the sub-pixels; a rolling structure, located between the display screen and the grating; and a push mechanism, for pushing the grating and/or the display screen, so that relative position of the grating and the display screen is switchable between a first state and a second state, and switchover between a dual viewing field display effect and an anti-spy display effect is achieved for the display device.

First claim

What is claimed is:

1. A display device, comprising:
a display screen, including a plurality of sub-pixels arranged in a form of a matrix, colors of the sub-pixels in a same column including all colors necessary for display by the display screen;
a grating, disposed on top of the display screen, including light-transmissive regions and light-shading regions that are arranged alternately, the light-transmissive regions being each in parallel to columns of the sub-pixels;
a rolling structure, located between the display screen and the grating; and
a push mechanism, configured to push the grating and the display screen to switch a relative position of the grating and the display screen between a first state for dual viewing field display and a second state for anti-spy display,
wherein, during the first state for the dual viewing field display, two different images are observed on a left side and a right side of the display device, respectively,
wherein the rolling structure is configured to reduce a friction force generated by a relative movement between the display screen and the grating, wherein, in the first state, a vertical projection of each of the light-transmissive regions on the display screen stretches across two corresponding columns of the sub-pixels that are adjacent, and completely or partially overlaps with areas where the two corresponding columns of the sub-pixels that are adjacent are located,
wherein, in the second state, a vertical projection of each of the light-transmissive regions on the display screen completely or partially overlaps with areas where only one corresponding column of the sub-pixels is located, and
wherein the push mechanism includes a first mechanical arm located on a first side of the grating and a second mechanical arm located on a second side of the display screen that are configured together to push the grating and the display screen to move simultaneously, and the first side of the grating and the second side of the display screen are respectively on two opposite sides of the display device.

2. The display device claimed as claim 1 , wherein, in switching the relative position of the grating and the display screen between the first state and the second state, positions of the grating and the display screen along a direction parallel to a plane where the sub-pixels are located become different.

3. The display device claimed as claim 2 , wherein, a variance amount of movement of the grating and the display screen along the direction parallel to the plane where the sub-pixels are located is N times of a half of a column width of the sub-pixels, and N is an odd integer.

4. The display device claimed as claim 2 , further comprising a flexible sealant for bonding the display screen and the grating together.

5. The display device claimed as claim 2 , further comprising a filling liquid filled between the display screen and the grating.

6. The display device claimed as claim 2 , wherein the rolling structure comprises spherical spacers.

7. The display device claimed as claim 1 , further comprising a flexible sealant for bonding the display screen and the grating together.

8. The display device claimed as claim 1 , further comprising a filling liquid filled between the display screen and the grating.

9. The display device claimed as claim 8 , wherein, a refractive index of the filling liquid is equal to a refractive index of the display screen.

10. The display device claimed as claim 1 , wherein the rolling structure comprises sphere bodies, ellipsoid bodies or cylinder bodies.

11. The display device claimed as claim 1 , wherein the rolling structure comprises spherical spacers.

12. The display device claimed as claim 1 , wherein the rolling structure is evenly distributed between the display screen and the grating.

13. The display device claimed as claim 1 , wherein grain diameter of the rolling structure is on an order of micrometers.

14. The display device claimed as claim 1 , wherein the push mechanism comprises:
a motor connected to the first and second mechanical arms, and configured to provide an action of the first and second mechanical arms with power.

15. The display device claimed as claim 14 , wherein the push mechanism further comprises:
a control circuit connected to the motor, and configured to control the motor to drive the first and second mechanical arms to push the grating and the display screen.

16. A driving method of a display device, for driving the display device claimed as claim 1 , comprising:
allowing the display device to stay in the first state when a dual viewing field display effect needs to be performed by the display device, the plurality of sub-pixels including first sub-pixels and second sub-pixels, applying signals that belong to different images to the first sub-pixels and the second sub-pixels, respectively; and
allowing the display device to stay in the second state when an anti-spy display effect needs to be performed by the display device, applying signals that belong to a same image to the plurality of sub-pixels.

17. The display device claimed as claim 1 , further comprising a filling liquid filled between the display screen and the grating, wherein a refractive index of the filling liquid is equal to a refractive index of glass.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Lin Chia Chiang
• Wu Yanbing

Classifications

• G02F1/1323 Primary

  Arrangements for providing a switchable viewing angle · CPC title

• G02F1/133514

  Colour filters · CPC title

• G02F1/133502

  Antiglare, refractive index matching layers · CPC title

• G09G3/36

  using liquid crystals · CPC title

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title