Peep preventing device, method of manufacturing peep preventing device, and display apparatus

Patent metadata

Field	Value
Publication number	US-11327370-B2
Application number	US-201816333193-A
Country	US
Kind code	B2
Filing date	Aug 20, 2018
Priority date	Oct 20, 2017
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

Embodiments of the present disclosure disclose a peep preventing device. The peep preventing device includes first electrodes and a transparent insulating body on a transparent substrate. The insulating body has recesses, the first electrodes are located in the recesses, respectively, and an area of a section, taken along a plane parallel to the transparent substrate, of each recess gradually reduces in a direction away from the transparent substrate. The peep preventing device further includes transparent second electrodes each of which includes a second electrode sidewall portion covering a sidewall of one of the recesses. Closed spaces are defined between the insulating body and the second electrodes and the transparent substrate, and electrophoretic liquids are contained in the closed spaces, respectively, and contain reflective charged particles adapted to adhere to the second electrodes when a first electric field is applied between the first electrodes and the second electrodes.

First claim

What is claimed is:

1. A peep preventing device comprising:
a transparent substrate;
a plurality of first electrodes on the transparent substrate;
a transparent insulating body on the transparent substrate, wherein the insulating body has a plurality of recesses in one-to-one correspondence with the first electrodes, each of the recesses has an opening facing towards the transparent substrate, the first electrodes are located in the recesses, respectively, and an area of a section, taken along a plane parallel to the transparent substrate, of each of the recesses gradually reduces in a direction away from the transparent substrate;
a plurality of transparent second electrodes each of which comprises a second electrode sidewall portion covering a sidewall of one of the recesses, the plurality of transparent second electrodes being in one-to-one correspondence with the plurality of recesses; and
electrophoretic liquids contained respectively in closed spaces defined by the insulating body, the second electrodes and the transparent substrate, wherein the electrophoretic liquids contain reflective charged particles adapted to adhere to the second electrodes when a first electric field is applied between the first electrodes and the second electrodes.

2. The peep preventing device of claim 1 , further comprising:
a switching device electrically connected with the first electrodes and the second electrodes, wherein the switching device is configured such that, when the switching device is in a first operating state, the first electric field is applied between the first electrodes and the second electrodes so that the reflective charged particles adhere to the second electrodes; and when the switching device is in a second operating state, a second electric field opposite in direction to the first electric field is applied between the first electrodes and the second electrodes so that the reflective charged particles adhere to the first electrodes.

3. The peep preventing device of claim 1 , wherein:
each of the recesses has two sidewalls each having a plane.

4. The peep preventing device of claim 3 , wherein:
the following relation is satisfied by an angle α between a normal of the transparent substrate and a line connecting a bottom end of a second electrode sidewall portion of one of two adjacent ones of the second electrodes and a top end of a second electrode sidewall portion, adjacent to the second electrode sidewall portion of the one second electrode, of the other of the two adjacent ones of the second electrodes:
0°<α≤θ, where θ is a preset maximal angle between an emergent light and the normal of the transparent substrate.

5. The peep preventing device of claim 4 , wherein:
a value of θ is 30 degrees.

6. The peep preventing device of claim 3 , wherein:
each of the closed spaces defined between the second electrodes and the transparent substrate has an isosceles trapezoidal section along a plane perpendicular to the transparent substrate, and each of the second electrodes further comprises a second electrode connection portion connecting two second electrode sidewall portions at ends of the two second electrode sidewall portions facing away from the transparent substrate.

7. The peep preventing device of claim 3 , wherein:
each of the closed spaces defined between the second electrodes and the transparent substrate has an isosceles triangular section along a plane perpendicular to the transparent substrate, and two second electrode sidewall portions of each of the second electrodes are directly connected together.

8. The peep preventing device of claim 6 , wherein:
the isosceles trapezoidal section has a base angle that is greater than or equal to 60° and less than 90°.

9. The peep preventing device of claim 7 , wherein: the isosceles triangular section has a base angle that is greater than or equal to 60° and less than 90°.

10. The peep preventing device of claim 1 , wherein:
the sidewall of each of the recesses has a shape of a concave arc surface depressed towards an inside of the recess.

11. The peep preventing device of claim 10 , wherein:
the following relation is satisfied by an angle α between a normal of the transparent substrate and a line connecting a bottom end of a second electrode sidewall portion of one of two adjacent ones of the second electrodes and a top end of a second electrode sidewall portion, adjacent to the second electrode sidewall portion of the one second electrode, of the other of the two adjacent ones of the second electrodes:
0°<α≤θ, where θ is a preset maximal angle between an emergent light and the normal of the transparent substrate.

12. The peep preventing device of claim 1 , wherein:
the section, taken along the plane parallel to the transparent substrate, of each of the recesses has an elliptical shape or a polygonal shape.

13. A display apparatus comprising the peep preventing device of claim 1 .

14. The display apparatus of claim 13 , further comprising:
a color filter substrate, wherein the peep preventing device is disposed on a light incidence side of the color filter substrate.

15. The display apparatus of claim 13 , further comprising:
a liquid crystal display panel and a backlight unit, wherein the peep preventing device is disposed between the liquid crystal display panel and the backlight unit.

16. The display apparatus of claim 13 , further comprising:
a liquid crystal display panel and a backlight unit, wherein the peep preventing device is integrated in the liquid crystal display panel, is located between an array substrate and a color filter substrate, or is integrated in the array substrate.

17. The display apparatus of claim 13 , further comprising:
an organic light-emitting diode panel, wherein the peep preventing device is disposed in the organic light-emitting diode panel.

18. A method of manufacturing a peep preventing device, the method comprising:
providing a support substrate;
forming a layer of a transparent insulating body on the support substrate;
forming a plurality of recesses in the transparent insulating body, wherein each of the recesses comprises two sidewalls inclined away from each other in a direction away from the support substrate;
forming a plurality of transparent second electrodes along the recesses of the transparent insulating body, wherein each of the second electrodes comprises a second electrode sidewall portion covering a sidewall of a corresponding one of the recesses, and the plurality of transparent second electrodes are in one-to-one correspondence with the plurality of recesses;
injecting electrophoretic liquids in the recesses formed with the second electrodes; and
covering the transparent insulating body with a transparent substrate to define closed spaces between the insulating body and the second electrodes and the transparent substrate so that the electrophoretic liquids are encapsulated in the closed spaces, wherein a plurality of first electrodes are formed on the transparent substrate, and each of the first electrodes is located in a corresponding one of the recesses and is spaced from two sidewalls of the corresponding one of the recesses,
wherein the electrophoretic liquids contain reflective charged particles, and the reflective charged particles are adapted such that, when a first electric field is applied between the first electrodes and the second electrodes, the reflective charged particles adhere to the second electrodes, thereby forming a peep preventing mode; and when a second electric field opposite in polarity

Assignees

• Boe Technology Group Co Ltd

Inventors

• Fang Zheng
• Choi Hyunsic
• Im Yunsik

Classifications

• G02F1/1676

  Electrodes · CPC title

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F1/133567

  on the back side · CPC title

• G02F1/133565

  inside the LC elements, i.e. between the cell substrates · CPC title

• G02F2201/44

  Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers · CPC title