Touch screen display with transparent electrical shielding layer

Patent metadata

Field	Value
Publication number	US-9329314-B2
Application number	US-201213549311-A
Country	US
Kind code	B2
Filing date	Jul 13, 2012
Priority date	Jul 13, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A polarizer includes a polarizer component having a top surface and an opposite bottom surface. The bottom surface is configured to couple to a color filter layer for a liquid crystal display. The polarizer also includes a transparent conducting layer disposed over the top surface. The transparent conducting layer being configured to electrically shield the LCD from a touch panel. The polarizer further includes a coating layer disposed over the transparent conducting layer.

First claim

What is claimed is:

1. A polarizer comprising:
a polarizer component having a top surface and an opposite bottom surface, the bottom surface being configured to couple to a color filter layer for a liquid crystal display;
a transparent conducting layer disposed over the top surface of the polarizer component, the transparent conducting layer being configured to electrically shield the LCD from a touch panel;
a first conductive tape contacting the transparent conductive layer at a first position;
a second conductive tape contacting the transparent conductive layer at a different second position; and
a conductive bar configured to connect the first and second conductive tapes.

2. The polarizer of claim 1 , wherein the transparent conducting layer comprises silver nano wire (AGNW) mesh.

3. The polarizer of claim 1 , wherein the transparent conducting layer has a sheet resistance ranging from 5 ohm/sq to 600 ohm/sq.

4. The polarizer of claim 3 , wherein the transparent conducting layer has a sheet resistance ranging from 5 ohm/sq to 150 ohm/sq.

5. The polarizer of claim 1 , wherein the transparent conducting layer has a transmittance equal to or greater than 97%.

6. The polarizer of claim 1 , wherein the transparent conducting layer has a reflectance equal to or less than 0.5%.

7. The polarizer of claim 1 , wherein the transparent conducting layer has a haze equal to or less than 0.3%.

8. The polarizer of claim 1 , wherein the polarizer component comprises:
a first adhesive layer;
an optical film layer disposed over the adhesive layer, the optical film configured to polarize a light;
a second adhesive layer disposed over the optical film layer; and
a transparent glass layer disposed over the second adhesive layer.

9. The polarizer of claim 8 , wherein the transparent glass layer comprises a material selected from a group consisting of TAC, COP, PET, and PMMA.

10. The polarizer of claim 1 , further comprising a coating layer disposed over the transparent conductive layer.

11. An LCD device, the device comprising:
a front polarizer;
a transparent conductive layer on a top surface of the front polarizer;
a color filter layer coupled to a bottom surface of the front polarizer;
an indium-tin oxide layer between the color filter layer and the bottom surface of the front polarizer;
a rear polarizer at a bottom of a stack of the LCD; and
a liquid crystal layer between the rear polarizer and the color filter layer.

12. The LCD device of claim 11 , wherein the transparent conductive layer has a substantially rectangular shape.

13. The LCD device of claim 12 , the device comprising:
a first conductive tape at a first corner of the transparent conductive layer;
a second conductive tape at a second corner of the transparent conductive layer, the second corner being the nearest corner to the first corner; and
a conductive bar configured to connect the first and second conductive tapes.

14. The LCD device of claim 13 , further comprising a third conductive tape at a third corner of the transparent layer.

15. The LCD device of claim 14 , further comprising a fourth conductive tape at a fourth corner of the transparent layer.

16. The LCD device of claim 15 , further comprising a conductive bar configured to connect the third and fourth conductive tape.

17. The LCD device of claim 13 , wherein each conductive tape comprises copper.

18. The LCD device of claim 13 , wherein the conductive bar comprises silver.

19. The LCD device of claim 11 , wherein the transparent conducting layer comprises silver nano wire (AGNW) mesh.

20. The LCD device of claim 11 , further comprising a coating layer disposed over the transparent conductive layer, the coating layer being selected from a group consisting of anti-reflection (AR) coating, AG coating, hard coating, and anti-smudge coating.

21. A portable electronic device, the device comprising:
a touch panel;
an LCD (liquid crystal display, wherein the LCD comprises:
a front polarizer coupled to a bottom surface of the touch panel;
a transparent conductive layer on a top surface of the front polarizer;
a color filter layer coupled to a bottom surface of the front polarizer;
an indium-tin oxide layer between the color filter layer and the bottom surface of the front polarizer;
a rear polarizer at a bottom of a stack of the LCD; and
a liquid crystal layer between the rear polarizer and the color filter layer.

22. The portable electronic device of claim 21 , further comprising a cover glass layer on a top surface of the touch panel.

23. The portable electronic device of claim 21 , further comprising a first coating layer on a top surface of the transparent conductive layer; a second coating layer on the bottom surface of the touch panel; and an air gap between the touch panel and the LCD.

24. The portable electronic device of claim 21 , wherein the transparent conductive layer has a substantially rectangular shape.

25. The portable electronic device of claim 24 , the device comprising:
a first conductive tape at a first corner of the transparent conductive layer;
a second conductive tape at a second corner of the transparent conductive layer, the second corner being the nearest corner to the first corner; and
a conductive bar configured to connect the first and second conductive tapes.

26. The portable electronic device of claim 25 , further comprising a third conductive tape at a third corner of the transparent layer.

27. The portable electronic device of claim 26 , further comprising a fourth conductive tape at a fourth corner of the transparent layer.

28. The portable electronic device of claim 27 , further comprising a conductive bar configured to connect the third and fourth conductive tape.

29. The portable electronic device of claim 21 , wherein the transparent conducting layer comprises silver nano wire (AGNW) mesh.

30. A portable electronic device, the device comprising:
a touch panel;
an LCD (liquid crystal display, wherein the LCD comprises:
a front polarizer coupled to a bottom surface of the touch panel;
a color filter layer coupled to a bottom surface of the front polarizer;
a transparent conductive layer on a top surface of the color filter and coupled between the front polarizer and the color filter;
a rear polarizer at a bottom of a stack of the LCD; and
a liquid crystal layer between the rear polarizer and the color filter layer.

31. The portable electronic device of claim 30 , wherein the transparent conductive layer has a substantially rectangular shape.

32. The portable electronic device of claim 31 , the device comprising:
a first conductive tape at a first corner of the transparent conductive layer;
a second conductive tape at a second corner of the transparent conductive layer, the second corner being the nearest corner to the first corner; and
a conductive bar configured to connect the first and second conductive tapes.

33. The portable electronic device of claim 32 , further comprising a third conductive tape at a third corner of the transparent layer.

34. The portable electronic device of claim 33 , further comprising a fourth conductive tape at a fourth corner of the transparent layer.

35. The portable electronic de

Assignees

• Chen Cheng
• Dorjgotov Enkhamgalan
• Kuwabara Masato
• Choi Wonjae
• Grunthaner Martin P
• Lin Albert
• Zhong John Z
• Chen Wei
• Hotelling Steven P
• Youngs Lynn R
• Apple Inc

Inventors

• Chen Cheng
• Dorjgotov Enkhamgalan
• Kuwabara Masato
• Choi Wonjae
• Grunthaner Martin P
• Lin Albert
• Zhong John Z
• Chen Wei
• Hotelling Steven P
• Youngs Lynn R

Classifications

• G02F1/134363

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

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G02B5/3033 Primary

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02F2001/133334

  Physics · mapped topic