Liquid crystal grating and driving method therefor, and 3D display device

Patent metadata

Field	Value
Publication number	US-12366777-B2
Application number	US-202218024013-A
Country	US
Kind code	B2
Filing date	Apr 26, 2022
Priority date	Apr 26, 2022
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

The present disclosure provides a liquid crystal grating and a driving method therefor, and a three-dimensional (3D) display device. The liquid crystal grating includes: a first substrate; a second substrate, where the second substrate and the first substrate are oppositely arranged; a liquid crystal layer, where the liquid crystal layer is located between the first substrate and the second substrate; and a first transparent grating electrode layer located at a side, facing the liquid crystal layer, of the first substrate; where the first transparent grating electrode layer includes a plurality of first strip-shaped electrodes extending in a first direction and arranged at intervals in a second direction, and each of at least part of the first strip-shaped electrodes is divided in the first direction into at least two first strip-shaped sub-electrodes arranged independently.

First claim

What is claimed is:

1. A liquid crystal grating, comprises:
a first substrate;
a second substrate, wherein the second substrate and the first substrate are oppositely arranged;
a liquid crystal layer, wherein the liquid crystal layer is located between the first substrate and the second substrate; and
a first transparent grating electrode layer located at a side, facing the liquid crystal layer, of the first substrate; wherein the first transparent grating electrode layer comprises a plurality of first strip-shaped electrodes extending in a first direction and arranged at intervals in a second direction, and
each of at least part of the plurality of first strip-shaped electrodes is divided in the first direction into at least two first strip-shaped sub-electrodes arranged independently;
wherein the liquid crystal grating further comprises: an insulating layer located at a side, facing the liquid crystal layer, of the first transparent grating electrode layer; and a second transparent grating electrode layer located at a side, facing the liquid crystal layer, of the insulating layer;
wherein the second transparent grating electrode layer comprises a plurality of second strip-shaped electrodes extending in the first direction and arranged at intervals in the second direction; orthographic projections of the plurality of second strip-shaped electrodes on the first substrate cover an orthographic projection of a region between two first adjacent strip-shaped electrodes on the first substrate; and each of at least part of the plurality of second strip-shaped electrodes is divided in the first direction into at least two second strip-shaped sub-electrodes arranged independently;
wherein the liquid crystal grating comprises a grating region and a peripheral region arranged around the grating region;
wherein the grating region comprises: a plurality of control lines extending in the first direction and arranged in the second direction; a plurality of signal input lines extending in the second direction and arranged in the first direction; and a plurality of drive transistors located between the first substrate and the first transparent grating electrode layer;
wherein the plurality of drive transistors are in one-to-one correspondence with the first strip-shaped sub-electrodes and the second strip-shaped sub-electrodes;
the plurality of control lines are arranged on a same layer as gates of the plurality of drive transistors, and the plurality of signal input lines are arranged on a same layer as sources and drains of the plurality of drive transistors; and
the gates of the plurality of drive transistors are electrically connected to the plurality of control lines, the sources of the plurality of drive transistors are electrically connected to the plurality of signal input lines, and the drains of the plurality of drive transistors are electrically connected to the first strip-shaped sub-electrodes or the second strip-shaped sub-electrodes.

2. The liquid crystal grating according to claim 1 , wherein each of the plurality of first strip-shaped electrodes is divided in the first direction into at least two first strip-shaped sub-electrodes arranged independently.

3. The liquid crystal grating according to claim 1 , wherein each of the plurality of second strip-shaped electrodes is divided in the first direction into at least two second strip-shaped sub-electrodes arranged independently.

4. The liquid crystal grating according to claim 3 , wherein a quantity of the second strip-shaped sub-electrodes of each of the plurality of second strip-shaped electrodes is equal to that of the first strip-shaped sub-electrodes of each of the plurality of first strip-shaped electrodes.

5. The liquid crystal grating according to claim 3 , wherein the first strip-shaped sub-electrodes of the plurality of first strip-shaped electrodes have a same length in the first direction, and the second strip-shaped sub-electrodes of the plurality of second strip-shaped electrodes have a same length in the first direction.

6. The liquid crystal grating according to claim 1 , wherein the plurality of control lines comprise first control lines and second control lines, the plurality of signal input lines comprise first signal input lines and second signal input lines, and the plurality of drive transistors comprise first drive transistors and second drive transistors;
gates of the first drive transistors are electrically connected to the first control lines, sources of the first drive transistors are electrically connected to the first signal input lines, and drains of the first drive transistors are electrically connected to the first strip-shaped sub-electrodes; and
gates of the second drive transistors are electrically connected to the second control lines, sources of the second drive transistors are electrically connected to the second signal input lines, and drains of the second drive transistors are electrically connected to the second strip-shaped sub-electrodes.

7. The liquid crystal grating according to claim 6 , wherein gates of first drive transistors electrically connected to a same first strip-shaped electrode are electrically connected to a same first control line; and
one first control line is electrically connected to gates of first drive transistors electrically connected to at least one first strip-shaped electrode.

8. The liquid crystal grating according to claim 7 , wherein gates of second drive transistors electrically connected to a same second strip-shaped electrode are electrically connected to a same second control line; and
one second control line is electrically connected to gates of second drive transistors electrically connected to at least one second strip-shaped electrode.

9. The liquid crystal grating according to claim 6 , wherein the peripheral region comprises a plurality of first signal leads and a plurality of second signal leads;
sources of first drive transistors electrically connected to a same first strip-shaped electrode are electrically connected to a same first signal lead through corresponding first signal input lines, and sources of first drive transistors electrically connected to different first strip-shaped electrodes are electrically connected to different first signal leads through corresponding first signal input lines; and
sources of second drive transistors electrically connected to a same second strip-shaped electrode are electrically connected to a same second signal lead through corresponding second signal input lines, and sources of second drive transistors electrically connected to different second strip-shaped electrodes are electrically connected to different second signal leads through corresponding second signal input lines.

10. The liquid crystal grating according to claim 6 , wherein the peripheral region comprises a plurality of first signal leads and a plurality of second signal leads;
sources of first drive transistors electrically connected to first strip-shaped sub-electrodes of a same first strip-shaped electrode are electrically connected to different first signal leads through corresponding first signal input lines, and sources of first drive transistors electrically connected to different first strip-shaped electrodes are electrically connected to different first signal leads through corresponding first signal input lines; and
sources of second drive transistors electrically connected to second strip-shaped sub-electrodes of a same second strip-shaped electrode are electrically connected to different second signal leads through corresponding second signal input lines, and sources of second drive transistors electrically connected to different second strip-shaped electrodes

Assignees

• Hefei Boe Display Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Zhang Yonggang
• Zhang Wei
• Li Chao
• Wang Xipeng
• Gao Jilei
• Zhou Xin
• Xu Benzhi
• Liu Qi
• Zhang Liangwei
• Zhang Xing

Classifications

• G02F1/133603

  with LEDs · CPC title

• H04N13/359

  Switching between monoscopic and stereoscopic modes · CPC title

• H04N13/383

  for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes · CPC title

• H04N13/32

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

• G02B30/33

  involving directional light or back-light sources · CPC title