Color tuning for electrophoretic display device

Patent metadata

Field	Value
Publication number	US-2016170106-A1
Application number	US-201615040193-A
Country	US
Kind code	A1
Filing date	Feb 10, 2016
Priority date	Aug 18, 2009
Publication date	Jun 16, 2016
Grant date	—

Abstract

The present invention is directed to color tuning methods for electrophoretic display devices. For example, a color tuning agent may be added to a composition for forming a display cell structure or a primer layer. Alternatively, a separate color tuning layer may be added to a display device. Further, a color tuning agent may be added to an electrophoretic display fluid. The color tuning methods are useful for adjusting the color temperature of a display device.

First claim

What is claimed is:

1 . A method for adjusting color temperature displayed by a display device comprising an electrophoretic fluid, wherein the electrophoretic fluid comprises charged pigment particles dispersed in a solvent in which one type of the charged pigment particles is of the white color and the white charged pigment particles are capable of displaying a white color state,
the method comprises adding 0.1 to 3% by weight of a color tuning agent into the electrophoretic fluid, wherein the color tuning agent carries the same charge polarity as the white charged pigment particles.

2 . The method of claim 1 , wherein adjustment of the color temperature of the white color state is defined by the change of a* or b* in the L*,a*,b* color space system being less than 5.

3 . The method of claim 1 , wherein the color tuning agent is selected from the group consisting of CI pigment PB15:1, PB15:2, PB15:3, PG36, PG58, PG7, PY138, PY150, PY20, and PY83.

4 . The method of claim 1 , wherein the concentration of the color tuning agent is 0.5 to 2% by weight in the fluid.

5 . The method of claim 1 , wherein the color tuning agent is in the form of particles.

6 . The method of claim 1 , wherein the color tuning agent is a blue pigment.

7 . The method of claim 5 , wherein the blue pigment has a concentration of 0.1 to 2% by weight in the fluid.

8 . The method of claim 6 , wherein the blue pigment has a concentration of 0.5 to 2% by weight in the fluid.

9 . The method of claim 1 , wherein the color tuning agent is a green pigment.

10 . The method of claim 8 , wherein the green pigment has a concentration of 0.1 to 2% by weight in the fluid.

11 . The method of claim 9 , wherein the green pigment has a concentration of 0.5 to 2% by weight in the fluid.

12 . The method of claim 1 , wherein the color of the color tuning agent is not displayed.

13 . The method of claim 2 , wherein the color tuning agent causes a* to be between 3 and minus 6.

13 . The method of claim 2 , wherein the color tuning agent causes a* to be between 0 and minus 3.

14 . The method of claim 2 , wherein the color tuning agent causes a* to be between 0 and minus 1.5.

15 . The method of claim 2 , wherein the color tuning agent causes b* to be between 4 and minus 5.

16 . The method of claim 2 , wherein the color tuning agent causes b* to be between 1 and minus 2.

17 . The method of claim 2 , wherein the color tuning agent causes b* to be between 0 and minus 2.

Assignees

• E Ink California Llc

Inventors

• Wang Ming
• Du Hui
• Lin Craig
• Chan Bryan Hans
• Zang Hongmei

Classifications

• G02F1/133516

  Methods for their manufacture, e.g. printing, electro-deposition or photolithography · CPC title

• G02B5/223 Primary

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• G02B1/111

  using layers comprising organic materials · CPC title

• G02F2001/1678

  characterised by the composition or particle type · CPC title

• G02F1/167

  by electrophoresis · CPC title