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A control method of amoled pixel circuit

A technology of pixel circuit and control method, applied in the control field of AMOLED pixel circuit, can solve the problem of impossible measurement of threshold voltage and the like

Inactive Publication Date: 2018-07-13
SHENZHEN DANBANG INVESTMENT GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this method has two defects: First, the time constant of the circuit is determined by the transconductance g of the drive tube T1 m Decide
Second, even if Vc reaches the Vth value, Vc will continue to drop due to the influence of the threshold current, making it impossible to accurately measure the threshold voltage

Method used

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  • A control method of amoled pixel circuit
  • A control method of amoled pixel circuit
  • A control method of amoled pixel circuit

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Embodiment Construction

[0036] The preferred embodiments of the invention will be further described in detail below.

[0037] Such as image 3 As shown, the AMOLED pixel circuit of an embodiment of the present invention includes a first TFT switch tube S1, a second TFT switch tube S2S2, a TFT drive tube T1, and a capacitor C S and OLED, the anode and cathode of the OLED are respectively connected to the first power supply V DD It is connected to the drain of the TFT driving transistor T1, and the source of the TFT driving transistor T1 is connected to the second power supply V SS connected, the gate of the TFT drive transistor T1 is connected to the data input terminal V through the second TFT switch transistor S2 data connected, the first TFT switch tube S1 is connected between the cathode of the OLED and the gate of the TFT drive tube T1, and the gate of the TFT drive tube T1 passes through the capacitor C s Grounded, the control terminal (gate) of the first TFT switch tube S1 and the control te...

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Abstract

The invention discloses a control method for an AMOLED pixel circuit, which includes: turning on the first TFT switch tube and the second TFT switch tube, making the first power supply and the second power supply at low level and high level respectively, and making the data input end at high level level; close the first TFT switch tube and open the second TFT switch tube, the first power supply and the second power supply jump to high level and low level respectively, so that the data input end is at high level; close the first TFT switch tube and open the second TFT switch tube Two TFT switch tubes, so that both the first power supply and the second power supply are at a high level, and the data input terminal inputs a data level; turn on the first TFT switch tube and close the second TFT switch tube, so that the first power supply and the second power supply are at a high level High level, the data input terminal inputs data voltage; turn off the first TFT switch tube and the second TFT switch tube, so that the first power supply and the second power supply are at high level and low level respectively. This circuit has higher compensation precision.

Description

【Technical field】 [0001] The invention relates to a control method of an AMOLED pixel circuit. 【Background technique】 [0002] Compared with liquid crystal display (LCD), organic light-emitting (AMOLED) displays are receiving extensive attention in recent years. figure 1 A 2-TFT pixel circuit for a simple AMOLED is shown. As can be seen from the figure, the data line V data The signal voltage required to drive the TFT is provided, and the scan line scan determines the TFT switch S 1 In the switching state, the voltage stored on the capacitor Cs is converted by the TFT drive tube T1 into a current passing through the OLED. Because of the drift in the threshold voltage of the T1 tube, this simple circuit cannot be used as a pixel circuit to drive an OLED, because the current and brightness of the OLED decay with time within a certain voltage range. Since the drift process of the threshold voltage of the TFT cannot be accurately predicted under the action of the gate-source...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3233G09G3/3291G09G3/3266
Inventor 刘萍
Owner SHENZHEN DANBANG INVESTMENT GROUP
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