Touch sensor liquid crystal display device with antistatic coating method

Patent metadata

Field	Value
Publication number	US-2021132425-A1
Application number	US-201716491900-A
Country	US
Kind code	A1
Filing date	Oct 31, 2017
Priority date	Mar 9, 2017
Publication date	May 6, 2021
Grant date	—

Abstract

Disclosed devices ( 100 ) include a liquid crystal layer ( 140 ), a cover glass ( 105 ), a polarizer ( 115 ), and at least one anti-static coating disposed on at least one major surface ( 105 A, 105 C) of the cover glass, at least one major surface ( 115 A, 115 C) of the polarizer, or both. Methods for reducing mura (light leakage) in a touch-display device by means of this anti-static coating are also disclosed.

First claim

1 . A device comprising:
(a) a liquid crystal layer; (b) a cover glass; (c) a polarizer positioned between the liquid crystal layer and the cover glass; and (d) a coating comprising at least one anti-static agent disposed on at least one major surface of the cover glass, at least one major surface of the polarizer, or both.

2 . The device of claim 1 , wherein the coating is disposed on at least a portion of at least one of a first major surface and a second major surface of the cover glass.

3 . The device of claim 1 , wherein the coating is disposed on at least a portion of at least one of a first major surface and a second major surface of the polarizer.

4 . The device of claim 1 , wherein the coating is disposed on at least one major surface of the cover glass and on at least one major surface of the polarizer.

5 . The device of claim 1 , wherein the coating has a thickness ranging from about 1 nm to about 5000 nm.

6 . The device of claim 1 , wherein the at least one anti-static agent is chosen from the group consisting of cationic polymers, anionic polymers, cationic polymers, anionic surfactants, and combinations thereof.

7 . The device of claim 1 , wherein the at least one anti-static agent is chosen from the group consisting of polycationic polymers, quaternary ammonium compounds, and combinations thereof.

8 . The device of claim 1 , further comprising a first adhesive layer positioned between the cover glass and the polarizer.

9 . The device of claim 8 , further comprising a second adhesive layer positioned between the polarizer and the liquid crystal layer.

10 . The device claim 1 , further comprising at least one of a receive (RX) sensor layer, a transmit (TX) sensor layer, a thin film transistor (TFT) array, a color filter glass, and a color filter.

11 . The device of claim 1 , wherein the device is a liquid crystal touch-display with an in-cell hybrid configuration.

12 . The device of claim 1 , further comprising an anti-fingerprint layer disposed on at least a portion of a first major surface of the cover glass.

13 . The device of claim 1 , wherein the cover glass has an electrostatic discharge decay time constant of less than about 1 second.

14 . The device of claim 1 , wherein the at least one major surface of the cover glass or the at least one major surface of the polarizer comprising the coating has a surface resistivity ranging from about 10 5 to about 10 11 Ohm/sq.

15 . A display, electronic, or lighting device comprising the device of claim 1 .

16 . A method for reducing mura in a touch-display device, the method comprising:
(a) positioning a polarizer between a cover glass and a liquid crystal layer; and (b) applying a coating comprising at least one anti-static agent to at least one major surface of the cover glass, at least one major surface of the polarizer, or both.

17 . The method of claim 16 , wherein step (b) comprises applying a solution comprising the at least one anti-static agent and at least one solvent to the at least one major surface of the cover glass or the at least one major surface of the polarizer.

18 . The method of claim 17 , wherein a concentration of the at least one anti-static agent in the solution ranges from about 0.0001 wt % to about 50 wt %.

19 . The method of claim 18 , wherein step (b) further comprises drying the solution to remove the at least one solvent.

20 . The method of claim 16 , wherein the coating has a thickness ranging from about 1 nm to about 5000 nm.

Assignees

• Corning Inc

Inventors

• Bhattacharyya Idrani
• Hu Jr-Nan
• Ishikawa Tomohiro
• Manley Robert George
• Mis Jonathan Michael
• Schneider Vitor Marino
• Thelen Dean Michael
• Widjaja Sujanto
• Zhelev Nikolay Zhelev

Classifications

• G02F1/133331

  Cover glasses · CPC title

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02F1/13338 Primary

  Input devices, e.g. touch panels · CPC title

• G02F2202/22

  Antistatic materials or arrangements · CPC title