Three-dimensional display device with sub-light source and corresponding blazed grating and display method thereof

Patent metadata

Field	Value
Publication number	US-10728530-B2
Application number	US-201815919347-A
Country	US
Kind code	B2
Filing date	Mar 13, 2018
Priority date	Sep 21, 2017
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

The present disclosure provides a three-dimensional display device and a display method thereof. The three-dimensional display device includes a display panel including a plurality of first display units and a plurality of second display units; a plurality of light emitting unit groups disposed on one side of the display panel, wherein each of the light emitting unit groups includes a plurality of first light emitting units respectively corresponding to the first display units, and a plurality of second light emitting units respectively corresponding to the second display units; and a control unit configured to control the first light emitting units and the second light emitting units in a light emitting unit group corresponding to a target position to emit lights so that the first light emitting units and the second light emitting units emit lights along a direction pointed to the target position.

First claim

What is claimed is:

1. A three-dimensional display device, comprising:
a display panel comprising a plurality of first display units and a plurality of second display units;
a plurality of light emitting unit groups, disposed on one side of the display panel; wherein each of the light emitting unit groups comprises a plurality of first light emitting units respectively corresponding to the first display units, and a plurality of second light emitting units respectively corresponding to the second display units;
wherein any one of the plurality of first light emitting units respectively corresponding to each of the first display units corresponds to one of the plurality of second light emitting units respectively corresponding to each of the second display units, such that the same first light emitting units respectively corresponding to the first display units and the corresponding same second light emitting units respectively corresponding to the second display units form one of the light emitting unit groups; and
a control unit configured to control the first light emitting units and the second light emitting units in the one light emitting unit group corresponding to a target position to emit lights so that the first light emitting units and the second light emitting units emit lights along a direction pointed to the target position, and other first light emitting units and the second light emitting units in the one light emitting unit group do not emit light,
wherein the control unit comprises a transmission grating disposed on a light emitting side of the light emitting unit group, and the transmission grating is configured to change the light emitting directions of the light emitting units,
the first light emitting unit and the second light emitting unit are strip-shaped light sources formed by a plurality of sub-light sources,
the transmission grating is a blazed grating, the blazed grating comprising a grating surface and a groove surface, wherein the grating surface is parallel to the light emitting surface of the light source, the groove surface forms an angle with the grating surface, and the angle is a blaze angle,
for the blazed gratings corresponding to the same light source, the larger the wavelength of the light emitted from sub-light source, the smaller is the blaze angle of the blazed grating corresponding to the sub-light source, and
the wavelength of the emitted light of the sub-light source and the blaze angle satisfy the relationship:
mλ =2 d ·sin α·cos θ 0

where λ represents the wavelength of the light emitted by the sub-light source, d represents the grating period of the blazed grating, α represents the angle between the emitted light of the sub-light source and the normal of the groove surface, θ 0 represents the blaze angle, and m is a natural number.

2. The three-dimensional display device according to claim 1 , wherein each of the sub-light sources in the light source is a white light source; and
for the blazed gratings corresponding to the same light source, the blaze angles are the same.

3. The three-dimensional display device according to claim 1 , wherein the light source comprises sub-light sources of at least three colors;
for the blazed gratings corresponding to the same light source, the blaze angles of the blazed gratings corresponding to the sub-light sources of the same color are the same.

4. The three-dimensional display device according to claim 1 , wherein a number of pixel columns corresponding to the first display unit is the same as a number of pixel columns corresponding to the second display unit.

5. The three-dimensional display device according to claim 1 , further comprising: a human-eye positioning unit;
wherein the human-eye positioning unit is configured to determine a position of human eyes, to determine the position of the human eyes as the target position, and to send the position information of the target position to the control unit.

6. A display method of a three-dimensional display device, wherein the three-dimensional display device comprises: a display panel comprising a plurality of first display units and a plurality of second display units; a plurality of light emitting unit groups, disposed on one side of the display panel; wherein each of the light emitting unit groups comprises a plurality of first light emitting units respectively corresponding to the first display units, and a plurality of second light emitting units respectively corresponding to the second display units; wherein any one of the plurality of first light emitting units respectively corresponding to each of the first display units corresponds to one of the plurality of second light emitting units respectively corresponding to each of the second display units, such that the same first light emitting units respectively corresponding to the first display units and the corresponding same second light emitting units respectively corresponding to the second display units form one of the light emitting unit groups, and a control unit configured to control the first light emitting units and the second light emitting units in the one light emitting unit group corresponding to a target position to emit lights so that the first light emitting units and the second light emitting units emit lights along a direction pointed to the target position, and other first light emitting units and the second light emitting units in the one light emitting unit group do not emit light, wherein the control unit comprises a transmission grating disposed on a light emitting side of the light emitting unit group; and the transmission grating is configured to change the light emitting directions of the light emitting units, the first light emitting unit and the second light emitting unit are strip-shaped light sources formed by a plurality of sub-light sources, the transmission grating is a blazed grating, the blazed grating comprising a grating surface and a groove surface, wherein the grating surface is parallel to the light emitting surface of the light source, the groove surface forms an angle with the grating surface, and the angle is a blaze angle, for the blazed gratings corresponding to the same light source, the larger the wavelength of the light emitted from sub-light source, the smaller is the blaze angle of the blazed grating corresponding to the sub-light source, and the wavelength of the emitted light of the sub-light source and the blaze angle satisfy the relationship: mλ=2d·sing α·cos θ 0 , where λ represents the wavelength of the light emitted by the sub-light source, d represents the grating period of the blazed grating, α represents the angle between the emitted light of the sub-light source and the normal of the groove surface, θ 0 represents the blaze angle, and m is a natural number, and the method comprises:
determining a target position; and
according to the target position, controlling the first light emitting units and the second light emitting units in the light emitting unit group corresponding to the target position to emit lights so that the first light emitting units and the second light emitting units emit lights in a direction toward the target position.

7. The display method according to claim 6 , wherein
according to the target position, controlling the first light emitting units and the second light emitting units in the light emitting unit group corresponding to the target position to emit lights comprises: according to the target position, turning on the light sources in the light emitting unit group corresponding to the target position.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wang Qian
• Chen Xiaochuan
• Zhao Wenqing
• Chen Chen Yu
• Zhu Jinye
• Li Zhongxiao
• Wang Haiyan

Classifications

• H04N13/31 Primary

  using parallax barriers · CPC title

• G02B30/30 Primary

  involving parallax barriers · CPC title

• H04N13/32

  using arrays of controllable light sources; using moving apertures or moving light sources · CPC title

• H04N13/398

  Synchronisation thereof; Control thereof · CPC title

• G02B30/27 Primary

  involving lenticular arrays · CPC title