Electronic device and method for improving stability of an electrophoretic display of the electronic device

Patent metadata

Field	Value
Publication number	US-2016217747-A1
Application number	US-201514930917-A
Country	US
Kind code	A1
Filing date	Nov 3, 2015
Priority date	Jan 24, 2015
Publication date	Jul 28, 2016
Grant date	—

Abstract

An electronic device includes an electrophoretic image display (EPD) panel, a switch circuit includes a relay and a metal oxide semiconductor field effect transistor (MOS-FET), and a electrophoretic display control unit in communication with the EPD panel and the MOS-FET through a data bus. The electrophoretic display control unit can receive a touch signal when a click operation is performed on the EPD panel, drive the EPD panel to update an image displayed on the EPD panel by controlling two normally open terminals of the relay to connect two common terminals of the relay, and control two normally closed terminals of the relay to connect the two common terminals of the relay after updating the image of the EPD panel. Thus, the quality of the image displayed on the EPD panel is increased as a contrast value of the image is barely changed.

First claim

What is claimed is:

1 . An electronic device comprising:
an electrophoretic display panel; a switch circuit coupled to the electrophoretic display panel and comprising a relay and a metal oxide semiconductor field effect transistor (MOS-FET); and at least one processor coupled to the electrophoretic display panel and the switch circuit, wherein the at least one processor executes a plurality of instructions to: receive a touch signal when a click operation is performed on the electrophoretic display panel; drive the electrophoretic display panel to update an image displayed on the electrophoretic display panel by controlling two normally open terminals of the relay to connect two common terminals of the relay; and control two normally closed terminals of the relay to connect the two common terminals of the relay after updating the image of the electrophoretic display panel.

2 . The electronic device according to claim 1 , wherein the relay is a double pole double throw (DPDT) relay comprising a coil with two terminals, the two normally open terminals, the two normally closed terminals, and the two common terminals.

3 . The electronic device according to claim 2 , wherein one of the two normally open terminals is connected to a common electrode of the electrophoretic display panel, and the other one of the two normally open terminal is connected to a pixel electrode of the electrophoretic display panel.

4 . The electronic device according to claim 2 , wherein the two normally closed terminals are floating.

5 . The electronic device according to claim 2 , wherein one terminal of the coil is connected to the MOS-FET, and the other terminal of the coil is connected to a power supply of the electronic device.

6 . The electronic device according to claim 5 , wherein the MOS-FET is in an off condition when the two normally closed terminals of the relay are connected to the two common terminals of the relay, and the MOS-FET is in an on condition when the two normally open terminals of the relay are connected to the two common terminals of the relay.

7 . A computer-implemented method for improving stability of a display of an electronic device comprising an electrophoretic display panel, a switch circuit coupled to the electrophoretic display panel and comprising a relay and a metal oxide semiconductor field effect transistor (MOS-FET), and at least one processor coupled to the electrophoretic display panel and the switch circuit, the method comprising:
receiving a touch signal when a click operation is performed on the electrophoretic display panel; driving the electrophoretic display panel to update an image displayed on the electrophoretic display panel by controlling two normally open terminals of the relay to connect two common terminals of the relay; and controlling two normally closed terminals of the relay to connect the two common terminals of the relay after updating the image of the electrophoretic display panel.

8 . The method according to claim 7 , wherein the relay is a double pole double throw (DPDT) relay comprising a coil with two terminals, the two normally open terminals, the two normally closed terminals, and the two common terminals.

9 . The method according to claim 8 , wherein one of the two normally open terminals is connected to a common electrode of the electrophoretic display panel, and the other one of the two normally open terminal is connected to a pixel electrode of the electrophoretic display panel.

10 . The method according to claim 8 , wherein the two normally closed terminals are floating.

11 . The method according to claim 8 , wherein one terminal of the coil is connected to the MOS-FET, and the other terminal of the coil is connected to a power supply of the electronic device.

12 . The method according to claim 11 , wherein the MOS-FET is in an off condition when the two normally closed terminals of the relay are connected to the two common terminals of the relay, and the MOS-FET is in an on condition when the two normally open terminals of the relay are connected to the two common terminals of the relay.

13 . A non-transitory storage medium having stored thereon instructions that, when executed by a processor of an electronic device, causes the processor to perform a method for improving stability of display of the electronic device, the electronic device further comprising an electrophoretic display panel and a switch circuit comprising a relay and a metal oxide semiconductor field effect transistor (MOS-FET), wherein the method comprises:
receiving, a touch signal when a click operation is performed on the electrophoretic display panel; driving the electrophoretic display panel to update an image displayed on the electrophoretic display panel by controlling two normally open terminals of the relay to connect two common terminals of the relay; and controlling two normally closed terminals of the relay to connect the two common terminals of the relay after updating the image of the electrophoretic display panel.

14 . The non-transitory storage medium according to claim 13 , wherein the relay is a double pole double throw (DPDT) relay comprising a coil with two terminals, the two normally open terminals, the two normally closed terminals, and the two common terminals.

15 . The non-transitory storage medium according to claim 14 , wherein one of the two normally open terminals is connected to a common electrode of the electrophoretic display panel, and the other one of the two normally open terminal is connected to a pixel electrode of the electrophoretic display panel.

16 . The non-transitory storage medium according to claim 14 , wherein the two normally closed terminals are floating.

17 . The non-transitory storage medium according to claim 14 , wherein one terminal of the coil is connected to the MOS-FET, and the other terminal of the coil is connected to a power supply of the electronic device.

18 . The non-transitory storage medium according to claim 17 , wherein the MOS-FET is in an off condition when the two normally closed terminals of the relay are connected to the two common terminals of the relay, and the MOS-FET is in an on condition when the two normally open terminals of the relay are connected to the two common terminals of the relay.

Assignees

• Chiun Mai Communication Systems Inc

Inventors

• Chang Kui-Hao

Classifications

• G09G3/344 Primary

  based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167) · CPC title

• G09G2330/02

  Details of power systems and of start or stop of display operation · CPC title

• G02F1/136

  Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit (G02F1/135 takes precedence) · CPC title

• G02F1/13306

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• G09G2310/0254

  Control of polarity reversal in general, other than for liquid crystal displays · CPC title