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Active matrix display and method for threshold voltage compensation therein

A threshold voltage, active matrix technology, applied in the field of active matrix displays, can solve complex circuits, reduce the maximum resolution of AMOLED displays, etc.

Active Publication Date: 2022-02-22
INTERUNIVERSITAIR MICRO ELECTRONICS CENT (IMEC VZW) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compensation for such current programming creates complex circuitry and thus reduces the maximum resolution of the AMOLED display

Method used

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  • Active matrix display and method for threshold voltage compensation therein
  • Active matrix display and method for threshold voltage compensation therein
  • Active matrix display and method for threshold voltage compensation therein

Examples

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Embodiment Construction

[0065] Figure 1a -b illustrates two different variants of pixel topologies for active matrix displays. Each pixel includes an organic light emitting diode (OLED) that emits light when current is driven through the OLED. exist Figure 1a In , an inverted OLED stack is illustrated. exist Figure 1a In the pixel topology, each pixel OLED has a common anode. exist Figure 1b In , a normal OLED stack is illustrated, where the OLEDs of each pixel have a common cathode. although Figure 1b The topology will be shown and discussed in the examples below, but it should be appreciated that alternatively using Figure 1a The inverted OLED stack topology.

[0066] Where the light emission of the pixels is provided by OLEDs, an active matrix OLED (AMOLED) display is provided. Although OLEDs are primarily discussed here, it should be recognized that active matrix displays can be applied to other types of light emitting elements arranged in an array and controlled by an active matrix. ...

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Abstract

A method of threshold voltage compensation in an active matrix display is provided. The display includes pixels, each pixel including: a drive transistor having a driver gate and a calibration gate, a first data line selectively connected to the driver gate, a second data line selectively connected to the calibration gate. The method includes: driving the display in a calibration measurement mode to measure the threshold voltage of a pixel, wherein the first data line is connected to the driver gate and the second data line is connected to the calibration gate, and the measurement signal is actively driving to one of the first and second data lines, and a calibration signal is measured on the other of the first and second data lines; determining calibration data based on the measured calibration signal; and driving the display in a calibration refresh mode , wherein the second data line is connected to the calibration gate of the drive transistor, and the determined calibration data is provided to the calibration gate of the drive transistor on the second data line.

Description

technical field [0001] The inventive concept relates to active matrix displays and a method for threshold voltage compensation in active matrix displays. Background technique [0002] Active matrix displays include a plurality of pixels arranged in an array, where each pixel has a light emitting element. The light emitted by the light emitting elements of the pixels together form the image presented by the display. The light emitting elements may eg be organic light emitting diodes (OLEDs) and the display may thus be an active matrix OLED (AMOLED) display. [0003] Active matrix displays such as AMOLED displays may use a driven backplane, for example in the form of one or more thin film transistor (TFT) arrays. The backplane can be fabricated in a low-temperature preparation, which enables the use of suitable substrates, for example, to form flexible displays. Active matrix displays such as AMOLED displays are therefore frequently used in various applications and are also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3225
CPCG09G3/3225G09G2310/0264G09G3/3233G09G3/3275G09G2300/043G09G2300/0819G09G2300/0852G09G2320/0204G09G2320/0233G09G2320/0295G09G2320/045G09G2300/0828
Inventor J·吉诺F·德卢斯W·德阿纳L·费许尔伦
Owner INTERUNIVERSITAIR MICRO ELECTRONICS CENT (IMEC VZW)
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