IP Library › Granted Patent US 12,253,784
Granted Patent B2
US 12,253,784 · App. 18/465,443 · Granted Mar 18, 2025

Electro-optic displays and driving methods

Inventor: Craig Lin (Fremont, CA)
Assignee: E Ink Corporation
G02F1/167G09G3/2074G09G3/344G09G2300/08G09G2310/02G09G2310/06G09G2320/0204
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Quick Facts
Patent No.
US 12,253,784
App. No.
18/465,443
Granted
Mar 18, 2025
Kind
B2
Abstract

A driving method for driving a display comprising an electrophoretic material having at least one type of colored pigment particle, the method includes applying at least one pulse pair to reset the at least one type of colored pigment particle, applying a separation pulse, and applying a second pulse pair to reset the at least one type of colored pigment particle.

Claims (30)

1. A method for driving an electro-optic display having a plurality of display pixels, wherein the electro-optic display includes an electrophoretic material having at least one type of colored pigment particle in a fluid disposed between a common electrode and pixel electrodes associated with each display pixel, the method comprising:

applying at least one first pulse pair to the plurality of display pixels to reset the at least one type of colored pigment particle;

applying a separation pulse having a constant voltage amplitude to the plurality of display pixels to drive the plurality of display pixels toward an extreme optical state, wherein a duration of the separation pulse is not long enough to drive the plurality of display pixels to the extreme optical state; and

applying at least one second pulse pair to the plurality of display pixels to reset the at least one type of colored pigment particle, and thereby produce the at least one type of colored pigment particle in a mixed state in the fluid, wherein the at least one second pulse pair includes a pulse having a positive amplitude and a pulse having a negative amplitude,

wherein the pulse having the positive amplitude and the pulse having the negative amplitude have the same duration,

wherein the at least one second pulse pair is DC balanced, and wherein the separation pulse is the only pulse between the at least one first pulse pair and the at least one second pulse pair,

wherein the separation pulse has a constant negative polarity for the duration of the separation pulse.

2. The method of claim 1 wherein the at least one first pulse pair includes a pulse having a positive amplitude and a pulse having a negative amplitude.

3. The method of claim 2 wherein the pulse having the positive amplitude and the pulse having the negative amplitude have the same duration.

4. The method of claim 1 wherein the at least one first pulse pair is DC balanced.

5. The method of claim 1 wherein the driving method is DC balanced.

6. The method of claim 2 wherein the separation pulse has the same amplitude as the pulse having the negative amplitude.

7. The method of claim 1 wherein the extreme optical state comprises one of a full black state or a full white state on the display.

8. The method of claim 1 wherein the electrophoretic material has at least three types of colored pigment particles disposed in the fluid.

9. The method of claim 1 wherein none of the pulses applied to the plurality of display pixels has a duration long enough to drive the plurality of display pixels to the extreme optical state.

10. A method for driving an electro-optic display having a plurality of display pixels, wherein the electro-optic display includes an electrophoretic material having at least one type of colored pigment particle in a fluid disposed between a common electrode and pixel electrodes associated with each display pixel, the method comprising:

applying at least one first pulse pair to the plurality of display pixels to reset the at least one type of colored pigment particle;

applying a separation pulse to the plurality of display pixels, wherein the separation pulse applied to each of the plurality of display pixels has the same amplitude and polarity, and wherein a duration of the separation pulse is not long enough to drive the plurality of display pixels to an extreme optical state; and

applying at least one second pulse pair to the plurality of display pixels to reset the at least one type of colored pigment particle, and thereby produce the at least one type of colored pigment particle in a mixed state in the fluid,

wherein the at least one second pulse pair includes a pulse having a positive amplitude and a pulse having a negative amplitude, wherein the pulse having the positive amplitude and the pulse having the negative amplitude have the same duration,

wherein the at least one second pulse pair is DC balanced, and wherein the separation pulse is the only pulse between the at least one first pulse pair and the at least one second pulse pair,

wherein the separation pulse maintains a constant amplitude and a constant negative polarity for the duration of the separation pulse.

11. The method of claim 10 wherein the at least one first pulse pair includes a pulse having a positive amplitude and a pulse having a negative amplitude.

12. The method of claim 11 wherein the pulse having the positive amplitude and the pulse having the negative amplitude have the same duration.

13. The method of claim 10 wherein the at least one first pulse pair is DC balanced.

14. The method of claim 10 wherein the driving method is DC balanced.

15. The method of claim 11 wherein the separation pulse has the same amplitude as the pulse having the negative amplitude.

16. The method of claim 10 wherein the extreme optical state comprises one of a full black state or a full white state on the display.

17. The method of claim 10 wherein the electrophoretic material has at least three types of colored pigment particles disposed in the fluid.

18. The method of claim 10 wherein none of the pulses applied to the plurality of display pixels has a duration long enough to drive the plurality of display pixels to the extreme optical state.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 10, 2023
From: LIN, CRAIG
To: E INK CALIFORNIA, LLC
Reel/Frame 065174/0703 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 4, 2023
From: E INK CALIFORNIA, LLC
To: E INK CORPORATION
Reel/Frame 065123/0578 →
Continuity (3)
Continuation 16512726 · Jul 16, 2019
Provisional Application 62699117 · Jul 17, 2018
Related Publication 20230418127A1 · Dec 28, 2023
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