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Pixel circuit

A technology of pixel circuit and power supply terminal, which is applied in the field of pixel circuit and can solve problems such as complex design voltage

Inactive Publication Date: 2008-10-01
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of traditional pixel circuits is that it requires complex design to change the voltage and requires a reset signal

Method used

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Embodiment Construction

[0026] Please refer to FIG. 2A , which shows a schematic diagram of an OLED pixel circuit according to an embodiment of the present invention. The pixel circuit is a voltage compensation pixel circuit with an N-type MOS transistor. The pixel circuit has a light emitting diode 210, a driving transistor 220, a capacitor 230 and a switch unit. The driving transistor 220 has a first source / drain 221 coupled to one end 211 of the LED 210 . The capacitor 230 is coupled between the gate 223 of the driving transistor 220 and one end 211 of the LED 210 . When a scanning signal (SCAN) is valid, the switch component unit couples the gate 223 of the driving transistor 220 to the second source / drain 222, and couples the second source / drain 222 of the driving transistor 220 to a data Line 250. Therefore, when the scan signal is active, the data signal (IDATA) on the data line 250 is transmitted to the pixel circuit.

[0027] The switch assembly unit has a first switch 241 and a second s...

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Abstract

A pixel circuit has a light emitting diode, a driving transistor, a capacitor, and a switch unit. The driving transistor has a first source / drain coupled to one end of the light emitting diode. The capacitor is coupled between a gate of the driving transistor and the end of the light emitting diode. The switch unit couples the gate and a second source / drain of the driving transistor together, and couples the second source / drain of the driving transistor to a data line when a scan signal is asserted.

Description

technical field [0001] The present invention relates to a pixel circuit, and in particular to an active matrix organic light emitting diode (Activated-Matrix Organic Light Emitting Display, AMOLED) voltage compensation pixel circuit. Background technique [0002] Figure 1A It is a schematic diagram of a known organic light emitting diode pixel circuit, which is a voltage compensation pixel circuit. Please refer to Figure 1A , the pixel circuit has a light emitting diode 110 , a driving transistor 120 , a capacitor 130 , a first transistor 141 and a second transistor 142 . The first source / drain 121 of the driving transistor 120 is coupled to one end 111 of the LED 110, and the second source / drain 122 thereof is coupled to the power supply terminal 170 (V SOURCE ). The capacitor 130 is coupled between the gate 123 of the driving transistor 120 and one end 111 of the LED 110 . When a scan signal (SCAN) is valid, the first drive transistor 141 is coupled to the gate 123 an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G3/3233G09G2300/0819
Inventor 邱郁文
Owner HIMAX TECH LTD