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High-precision voltage programming pixel circuit and flexible AMOLED (active matrix/organic light-emitting diode) display

A pixel circuit, high-precision technology, applied in the field of active-driven organic light-emitting display, can solve the problem of impossible measurement of threshold voltage, achieve high-precision threshold voltage drift compensation, simple structure, and short programming time

Active Publication Date: 2014-03-26
SHENZHEN DANBANG INVESTMENT GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, this scheme has two defects: First, the time constant of the circuit is determined by the transconductance gm of the drive tube T1
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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  • High-precision voltage programming pixel circuit and flexible AMOLED (active matrix/organic light-emitting diode) display
  • High-precision voltage programming pixel circuit and flexible AMOLED (active matrix/organic light-emitting diode) display
  • High-precision voltage programming pixel circuit and flexible AMOLED (active matrix/organic light-emitting diode) display

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Embodiment Construction

[0024] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0025] refer to image 3 , in one embodiment, the high-precision voltage-driven pixel circuit includes: three N-type TFT transistors——TFT driving transistor T1, a first switching transistor S1, a second switching transistor S2, a capacitor Cs, and a flexible AMOLED. The gate of the TFT drive tube T1 is connected to one end of the capacitor Cs and the source or drain of the first switch tube S1 and the second switch tube S2, the source of the TFT drive tube T1 is connected to the source power supply VSS, and the TFT drive tube T1 The drain is connected to the source or drain of the first switching tube S1 and the cathode of the OLED, the source or drain of the second switching tube S2 is connected to the sig...

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Abstract

A high-precision voltage programming pixel circuit comprises a first thin film transistor (TFT) switch tube, a second TFT switch tube, a TFT driving tube, a capacitor and a flexible AMOLED (active matrix / organic light-emitting diode). A grid electrode of the TFT driving tube is connected with one end of the capacitor and source electrodes or drain electrodes of both the first TFT switch tube and the second TFT switch tube, a source electrode of the TFT driving tube is connected with a driving tube source electrode power supply, a drain electrode of the TFT driving tube is connected with the source electrode or the drain electrode of the first TFT switch tube and a negative electrode of the flexible AMOLED, the source electrode or the drain electrode of the second TFT switch tube is connected to a signal line, a grid electrode is connected to a second scanning line, a grid electrode of the first TFT switch tube is connected to a first scanning line, a positive electrode of the flexible AMOLED is connected to a voltage source, and the other end of the capacitor is in ground connection. A flexible AMOLED display is provided with the pixel circuit. The pixel circuit can effectively compensate for threshold voltage deviation of a TFT and has the advantages that programming time is short and the error rate is low.

Description

[0001] This application claims the priority of the following prior invention patent application: Application No. 201310518296.1 Invention title "High precision voltage programming pixel circuit and OLED display". technical field [0002] The invention relates to an active-driven organic light-emitting display technology, in particular to a high-precision voltage programming pixel circuit and a flexible AMOLED display with the circuit. Background technique [0003] 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. From figure 1 It can be seen that the data line provides the signal voltage required to drive the thin film transistor (TFT), the scan line determines the switching state of the TFT, and the voltage stored on Cs is converted by T1 into the current passing through the OLED. Because of the drift in the threshold voltage o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3233
Inventor 刘萍摩达·巴盖里
Owner SHENZHEN DANBANG INVESTMENT GROUP
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