Optical device, display apparatus and method for driving same

Patent metadata

Field	Value
Publication number	US-11269224-B2
Application number	US-201816089891-A
Country	US
Kind code	B2
Filing date	Feb 6, 2018
Priority date	Mar 10, 2017
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

An optical assembly, a display device and a method for driving the same are provided. The optical assembly includes two substrates disposed opposite to each other, and electrodes are disposed on the two substrates respectively. Voltages are applied to the electrodes to form a transverse electric field being configured for driving liquid crystal molecules proximal to the substrates to deflect, so that liquid crystal proximal to the two substrates both form liquid crystal lenses, thereby forming a double-layer liquid crystal lens structure. Since the two substrates of a liquid crystal cell have high alignment accuracy, the electrodes on the two substrates are consistent in spatial distribution, thereby solving mura problem.

First claim

The invention claimed is:

1. An anti-peeping display device, comprising:
a display panel; and
an optical assembly disposed on a display side of the display panel, comprising:
a first substrate and a second substrate, disposed opposite to each other;
liquid crystals, filled between the first substrate and the second substrate;
at least one set of first electrodes, disposed on the first substrate and comprising at least two first electrodes, the at least two first electrodes being configured to form a first electric field for driving liquid crystal molecules proximal to the first substrate to deflect, so as to form a first liquid crystal lens; and
at least one set of second electrodes, disposed on the second substrate and comprising at least two second electrodes, the at least two second electrodes being configured to form a second electric field for driving liquid crystal molecules proximal to the second substrate to deflect, so as to form a second liquid crystal lens,
wherein both the first electric field and the second electric field are transverse electric fields,

wherein the first liquid crystal lens and the second liquid crystal lens are of a same type, both being a concave lens, and focal points of the first liquid crystal lens and the second liquid crystal lens have positions corresponding to each other.

2. The anti-peeping display device according to claim 1 , wherein positions of the at least two first electrodes are in one-to-one correspondence with positions of the at least two second electrodes.

3. The anti-peeping display device according to claim 2 , wherein each set of the at least one set of the first electrodes consists of two first electrodes, and each set of the at least one set of the second electrodes consists of two second electrodes.

4. The anti-peeping display device according to claim 2 , wherein the at least one set of the first electrodes comprises at least three first electrodes distributed evenly and configured to be applied with at least three different voltages respectively, and the at least one set of the second electrodes comprises at least three second electrodes distributed evenly and configured to be applied with the at least three different voltages respectively.

5. The anti-peeping display device according to claim 1 , wherein a position of the at least one set of the first electrodes is in one-to-one correspondence with a position of the at least one set of the second electrodes.

6. A method for driving the display device according to claim 1 , comprising:
applying voltages to the at least two first electrodes of each set of the at least one set of the first electrodes, to form the first electric field for driving liquid crystal molecules proximal to the first substrate to deflect, so as to form the first liquid crystal lens; and
applying voltages to the at least two second electrodes of each set of the at least one set of the second electrodes, to form the second electric field for driving liquid crystal molecules proximal to the second substrate to deflect, so as to form the second liquid crystal lens.

7. The method according to claim 6 , wherein each set of the at least one set of the first electrodes consists of two first electrodes, and each set of the at least one set of the second electrodes consists of two second electrodes.

8. The method according to claim 7 , comprising
applying voltages having opposite polarities to the two first electrodes of each set of the at least one set of the first electrodes, respectively; and
applying voltages having opposite polarities to the two second electrodes of each set of the at least one set of the second electrodes, respectively.

9. The method according to claim 6 , wherein the at least one set of the first electrodes comprises at least three first electrodes, and the at least one set of the second electrodes comprises at least three second electrodes, the at least three first electrodes are applied with at least three different voltages respectively, and the at least three second electrodes are applied with the at least three different voltages respectively.

10. The method according to claim 9 , comprising:
applying voltages having same polarity to the at least three first electrodes of each set of the at least one set of the first electrodes, the voltages being increased firstly and then decreased in a distribution direction of the at least three first electrodes, and an absolute value of a voltage difference between two adjacent first electrodes being also increased firstly and then decreased; and
applying voltages having same polarity to the at least three second electrodes of each set of the at least one set of the second electrodes, the voltages being increased firstly and then decreased in a distribution direction of the at least three second electrodes, and an absolute value of a voltage difference between two adjacent second electrodes being also increased firstly and then decreased.

11. The method according to claim 6 , wherein a position of the at least one set of the first electrodes is in one-to-one correspondence with a position of the at least one set of the second electrodes, a position of each first electrode corresponds to a position of one of the second electrodes, and each first electrode and each second electrode are supplied with a same voltage.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wang Qian
• Chen Xiaochuan
• Zhao Wenqing
• Li Zhongxiao
• Niu Xiaochen

Classifications

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F1/133526

  Lenses, e.g. microlenses or Fresnel lenses · CPC title

• G02F1/13306

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• G02F1/294

  Variable focal length devices · CPC title

• G02F1/134363 Primary

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title