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Pixel circuit of light-emitting diode display and drive method of pixel circuit

A technology of light-emitting diodes and pixel circuits, which is applied in the field of pixel circuits, and can solve the problems of decreased luminous efficiency and decreased current of light-emitting diodes, etc.

Active Publication Date: 2012-10-31
HANNSTAR DISPLAY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] One object of the present invention is to provide a LED display pixel circuit and its driving method, which can comprehensively solve the problems of LED current drop, luminous efficiency drop, and IR voltage drop as the size of the display increases. and its driving method

Method used

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  • Pixel circuit of light-emitting diode display and drive method of pixel circuit
  • Pixel circuit of light-emitting diode display and drive method of pixel circuit
  • Pixel circuit of light-emitting diode display and drive method of pixel circuit

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Embodiment Construction

[0027] In order to make the above-mentioned purposes, features, and advantages of the present invention more comprehensible, a preferred embodiment is specifically cited below, and in conjunction with the accompanying drawings, the detailed description is as follows:

[0028] Please refer to the attached Figure 4 , is the circuit structure diagram of the pixel circuit of the active light-emitting diode matrix display AMOLED in the first embodiment of the present invention. As shown in the figure, the first thin film transistor is an N-type thin film transistor. The second, third, fourth and fifth thin film transistors are P-type thin film transistors. Moreover, in the present invention, there is no need for a pixel as in the prior art, and a storage capacitor C must be provided. st . attached Figure 4 The LED display pixel circuit shown in has a data signal line Data connected to the pixel circuit, an activation signal line Emit[n], and a scanning signal line Scan[n], wh...

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Abstract

A grid of a first thin-film transistor in a display pixel discharges by permeating the first thin-film transistor and a light-emitting diode in a compensation and data writing stage. After the service time is increased, discharging (charging) voltage can be smaller and gird voltage of the first thin-film transistor can be larger so as to compensate decrease of current of the light-emitting diode when critical voltage of the first thin-film transistor becomes larger and the carrier mobility becomes smaller or cross voltage of an organic light emitting diode rises after long-time use or the size of a light-emitting diode display becomes larger to produce IR (infrared ray) voltage drop. Moreover, a fifth thin-film transistor and the first thin-film transistor for driving the light-emitting diode also have the characteristic of critical voltage rise, and influences of efficiency drop of the light-emitting diode can be compensated when the critical voltage of the fifth thin-film transistor rises along with increase of the service time.

Description

technical field [0001] The present invention relates to a pixel circuit of a light-emitting diode display, in particular to a pixel circuit of a light-emitting diode display that can comprehensively solve the problems of light-emitting diode current drop, luminous efficiency drop, and IR voltage drop as the size of the display increases. its driving method. Background technique [0002] Liquid crystal display (LCD) is the mainstream of current display technology. However, the organic light emitting diode display (OLED) is recognized by the industry as a display technology that will replace the liquid crystal display and become the display technology of the next era. Compared with liquid crystal displays, organic light-emitting diode displays have many advantages, such as: self-illumination, wide viewing angle, fast response time, high brightness, high lumen efficiency, low operating voltage, thin panel thickness, flexibility, manufacturing process There are many advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3233G09G3/3266G09G3/3291
Inventor 柯健专吴昭慧
Owner HANNSTAR DISPLAY CORPORATION
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