# US 2014/0177031 A1 · Color display architecture and driving methods

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- Number: US 2014/0177031 A1
- Document ID: US20140177031A1
- Status: Published application
- Kind: A1
- Application number: 14/195,679
- Filed: 2014-03-03
- Published: 2014-06-26
- Earliest claimed: 2010-05-26
- Assignees: SiPix Imaging, Inc.
- Applicants: SiPix Imaging, Inc.
- Inventors: Craig LIN
- Web page: https://patentgrep.com/patent/US20140177031A1

## CPC

- G02F 1/167: by electrophoresis
- G02B 26/00: Optical devices or arrangements for the control of light using movable or deformable optical elements (control of light by modification of the optical properties of the media of the elements involved therein G02F1/00)
- G02B 26/02: for controlling the intensity of light {(G02B26/004 takes precedence)}
- G02B 26/026: {based on the rotation of particles under the influence of an external field, e.g. gyricons, twisting ball displays (based on orientable dipolar particles G02F1/172; based on electrophoresis G02F1/167)}
- G09G 3/34: by control of light from an independent source
- G09G 3/344: {based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167)}
- G02F 1/1681: having two or more microcells partitioned by walls, e.g. of microcup type
- G02F 2001/1678: {characterised by the composition or particle type}
- G02F 2203/34: Colour display without the use of colour mosaic filters
- G09F 9/372: {the positions of the elements being controlled by the application of an electric field}
- G09G 2300/0439: Pixel structures
- G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
- G09G 2320/0242: Compensation of deficiencies in the appearance of colours
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS

## Abstract

The invention relates to a method for driving a display cell filled with an electrophoretic fluid comprising two types of charged particles carrying opposite charge polarities and of two contrast colors, wherein the two types of pigment particles are dispersed in a solvent of a color or in a solvent with non-charged or slightly charged colored particles dispersed therein. The method comprises driving said display cell to display the color of the solvent or the color of the non-charged or slightly charged colored particles by applying a driving voltage which is about 1 to about 20% of the full driving voltage.

## Claims

### Claim 1

A method for driving a color display comprising display cells sandwiched between a common electrode and pixel electrodes, wherein each of the display cells is filled with an electrophoretic fluid comprising two types of charged particles and one type of non-charged or slightly charged colored particles dispersed in a solvent, and the two types of charged particles carry opposite charge polarities and are of two contrast colors;
the method comprises applying a driving voltage between the common electrode and a pixel electrode to drive the electrophoretic fluid in an area corresponding to the pixel electrode to display the color of the non-charged or slightly charged colored particles, wherein the driving voltage is 1 to 20% of a full driving voltage required to drive the two types of charged particles to be near or at the common electrode or the pixel electrodes.

### Claim 2 (depends on 1)

The method of claim 1, wherein said two types of charged particles are white and black charged particles carrying opposite charge polarities.

### Claim 3 (depends on 1)

The method of claim 1, wherein the color of the non-charged or slightly charged colored particles is non-black and non-white.

### Claim 4 (depends on 1)

The method of claim 1, wherein the color of the non-charged or slightly charged colored particles is red, green or blue.

### Claim 5 (depends on 1)

The method of claim 1, wherein the two types of charged particles have different degrees of mobility.

### Claim 6 (depends on 1)

The method of claim 1, wherein the two types of charged particles have similar mobility.

### Claim 7 (depends on 1)

The method of claim 1, wherein said display cell is microcup-based.

### Claim 8 (depends on 1)

The method of claim 1, wherein said display cell is microcapsule-based.

### Claim 9 (depends on 1)

The method of claim 1, wherein color of the non-charged or slightly charged colored particles is the same color in all display cells.

### Claim 10 (depends on 1)

The method of claim 1, wherein colors of the non-charged or slightly charged colored particles are different in display cells.