US 10,504,422 B2Granted

Compensation circuit and display panel

AssigneeAu Optronics Corporation

InventorsMao-Hsun Cheng, Cheng-Han Huang, Wei-Ting Wu, Yung-Chih Chen

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Abstract

A display panel and a compensation circuit are provided. The display panel has a periphery region and a display region. The display panel includes pixel columns and a threshold voltage compensation circuit. The pixel columns are disposed in the display region. The threshold voltage compensation circuit is disposed in the periphery region. The threshold voltage compensation circuit receives a compensation voltage, outputs threshold voltage information of a compensation transistor based on the compensation voltage, and generates compensated display data based on the threshold voltage information and display data.

Claims12

Dependent claims

A display panel, having a periphery region and a display region and comprising:

a pixel column, disposed in the display region and having a plurality of pixels coupled to a data line;
a threshold voltage compensation circuit, disposed in the periphery region and comprising:
a threshold voltage detection circuit, electrically coupled to the data line and comprising:
a first transistor, having a first end, a second end, and a control end, wherein the first end of the first transistor and the control end of the first transistor are configured to receive a compensation voltage;
a compensation transistor, outputting threshold voltage information of the compensation transistor based on the compensation voltage and having a first end, a second end, and a control end, wherein the second end of the first transistor is coupled to the control end of the compensation transistor, the control end of the first transistor is coupled to the second end of the compensation transistor, and the first end of the compensation transistor is coupled to the control end of the compensation transistor;
and
a second transistor, having a first end, a second end, and a control end, wherein the first end of the compensation transistor is coupled to the first end of the second transistor;
and
an operator, electrically coupled to the threshold voltage detection circuit and configured to generate compensated display data based on the threshold voltage information and display data.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/223,111Filed 18 Dec 2018
Priority: TW 107103335 A30 Jan 2018
Published: US 2019/0237006 A11 Aug 2019
Granted: 10 Dec 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G09G 3/32
Using electroluminescent panels: semiconductive, e.g. using light-emitting diodes [LED]
G09G 3/3225
Organic, e.g. using organic light-emitting diodes [OLED]: using an active matrix
G09G 2300/0819
Several active elements per pixel in active matrix panels: used for counteracting undesired variations, e.g. feedback or autozeroing
G09G 2320/0233
Improving the quality of display appearance: improving the luminance or brightness uniformity across the screen

Family

US 2019/0237006 A1Pre-grant publication · published 1 Aug 2019
US 10,504,422 B2This patent

From the US filing history. Foreign family members aren’t listed.

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