Display and sub-pixel driving method therein

Patent metadata

Field	Value
Publication number	US-9852683-B2
Application number	US-201414465285-A
Country	US
Kind code	B2
Filing date	Aug 21, 2014
Priority date	May 23, 2014
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A display and a sub-pixel driving method therein are provided. The display includes a data line and a sub-pixel. The data line is configured to provide a data voltage signal. The sub-pixel includes a driving unit, a first light-emitting unit and a second light-emitting unit. The driving unit is configured to generate a driving current according to the data voltage signal. The first light-emitting unit is configured to emit light by the driving current and generate an operating voltage according to the driving current. The second light-emitting unit is selectively substituted for the first light-emitting unit to emit light according to a variation of the operating voltage.

First claim

What is claimed is:

1. A display, comprising:
a data line configured to provide a data voltage signal;
a sub-pixel, comprising:
a first light-emitting component comprising a first terminal and a second terminal, wherein the first terminal is configured to receive a first voltage;
a second light-emitting component comprising a first terminal and a second terminal, wherein the first terminal is configured to receive the first voltage;
a first transistor comprising a first terminal, a second terminal and a control terminal, wherein the first terminal is configured to receive a driving current corresponding to the data voltage signal, and the second terminal is electrically coupled to the second terminal of the first light-emitting component;
a second transistor comprising a first terminal, a second terminal and a control terminal, wherein the first terminal is configured to receive the driving current, and the second terminal is electrically coupled to the second terminal of the second light-emitting component; and
a comparator comprising a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is directly connected to the second terminal of the first light-emitting component and the second terminal of the first transistor, the second input terminal is configured to receive a reference voltage, and the output terminal is electrically coupled to the control terminal of the first transistor and the control terminal of the second transistor;
wherein the control terminal of the first transistor and the control terminal of the second transistor are directly connected and the control terminal of the first transistor and the control terminal of the second transistor are controlled by a same signal.

2. The display of claim 1 , wherein the sub-pixel further comprises:
a third transistor comprising a first terminal, a second terminal and a control terminal, wherein the first terminal is configured to receive a second voltage, the second terminal is electrically coupled to the first terminal of the first transistor and the first terminal of the second transistor, and the control terminal is electrically coupled to the data line; and
a capacitor comprising a first terminal and a second terminal, wherein the first terminal is electrically coupled to the first terminal of the third transistor, and the second terminal is electrically coupled the control terminal of the third transistor.

3. The display of claim 2 , wherein the sub-pixel further comprises:
a fourth transistor comprising a first terminal, a second terminal and a control terminal, wherein the first terminal is electrically coupled to the control terminal of the third transistor, the second terminal is electrically coupled to the data line, and the control terminal is configured to receive a selection signal.

4. The display of claim 1 , wherein characteristic of the first transistor and characteristic of the second transistor are complementary.

5. The display of claim 1 , wherein the first input terminal receives an operating voltage, when the operating voltage is substantially smaller than the reference voltage, the first transistor is turned on and the second transistor is turned off, when the operating voltage is substantially larger than the reference voltage, the first transistor is turned off and the second transistor is turned off.

Assignees

• Au Optronics Corp

Inventors

• Liu Yi-Cheng

Classifications

• G09G3/2074

  using sub-pixels · CPC title

• G09G2300/0804

  Sub-multiplexed active matrix panel, i.e. wherein one active driving circuit is used at pixel level for multiple image producing elements · CPC title

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title