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Pixel circuit, pixel circuit driving method and display device

A pixel circuit and drive transistor technology, applied in static indicators, instruments, etc., can solve problems such as no good solutions, achieve the effect of increasing the complexity of circuit structure and operation, and maintaining uniformity and stability

Active Publication Date: 2013-07-24
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still no good solution for how to perfectly integrate the touch circuit with the pixel circuit.

Method used

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  • Pixel circuit, pixel circuit driving method and display device
  • Pixel circuit, pixel circuit driving method and display device
  • Pixel circuit, pixel circuit driving method and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In this embodiment, the pixel circuit structure of a common-cathode OLED display is taken as an example for illustration. Such as image 3 As shown in , the pixel circuit in the present invention includes an electroluminescence element, a drive transistor, a first switch unit, a compensation unit, an isolation unit, and a storage capacitor; the first switch unit is used to control the writing of the data voltage of the data line, and the second The first end of a switch unit is connected to the first end of the storage capacitor, and the first end is connected to the data line; the second end of the storage capacitor is respectively connected to the drive transistor gate and the first end of the compensation unit; the compensation unit is used to provide the storage capacitor The threshold voltage of the driving transistor is stored in advance, the second terminal of the compensation unit is connected to the drain of the driving transistor; the source of the driving tra...

Embodiment 2

[0074] The present invention also perfectly integrates the touch circuit in the pixel circuit; in this embodiment, the pixel circuit described in Embodiment 1 is used as an example to illustrate, Figure 10 Shown in is the pixel circuit in this embodiment, except that it includes an organic light emitting diode OLED, a driving transistor DTFT, a first switching transistor T5, a compensation transistor T2, an isolation transistor T3, a reset transistor T6 and a storage capacitor C st In addition, it also includes a touch control circuit integrated in the above pixel circuit, the touch control circuit includes a charging transistor T4, a coupling capacitor C P , the sensing electrode Sense Electrode, the amplifying transistor ATFT and the second switching transistor T1; the gate of the charging transistor T4 is connected to the third control signal terminal, and the source is connected to the storage capacitor C st The second terminal is connected, and the drain is connected to ...

Embodiment 3

[0103] This embodiment provides a display device, including the above-mentioned pixel circuit. Specifically, the display device includes a plurality of pixel unit arrays, and each pixel unit corresponds to any pixel circuit in the above-mentioned embodiments. Because the pixel circuit compensates the threshold voltage drift of the driving transistor, the display of the organic light emitting diode is stable and does not flicker, thereby ensuring the display quality of the organic light emitting display device; at the same time, the touch control circuit in the present invention multiplexes the control of the pixel circuit The signal, while charging the storage capacitor, charges the coupling capacitor in the touch circuit through the charging transistor, which perfectly realizes the integration of the touch circuit in the pixel circuit, integrates the display and touch functions, and uses a process that is It can be completed without being divided into two process flows, so it...

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Abstract

The invention relates to the technical field of organic light emitting display, in particular to a pixel circuit, a driving method for driving the pixel circuit and a display device comprising the pixel circuit. The pixel circuit is connected by using a diode which is formed by a driving transistor when data are written into a storage capacitor, the storage capacitor is used for prestoring threshold voltages and data voltage signals of the driving transistor, effective compensation is achieved to threshold voltage drifts, and the evenness and the stability of drive currents are guaranteed. Further, multiplexing of control signals of the pixel circuit by a touch circuit is achieved, charging is conducted on the storage capacitor, and at the same time, charging is conducted on a coupling capacitor in the touch circuit through a charging transistor. Therefore, the circuit structure and operation complexity are not added, and meanwhile the integration of the touch circuit in the pixel circuit is perfectly achieved.

Description

technical field [0001] The present invention relates to the technical field of organic light-emitting display, and in particular to a pixel circuit, a driving method for driving the pixel circuit, and a display device including the pixel circuit. Background technique [0002] Compared with traditional LCD panels, AMOLED (Active Matrix / Organic Light Emitting Diode, active matrix organic light-emitting diode) panels have the characteristics of faster response, higher contrast, and wider viewing angles. Therefore, AMOLED has been favored by display technology developers. growing attention. [0003] Active matrix organic light emitting diodes are driven by pixel circuits to emit light. The traditional 2T1C pixel circuit consists of two transistors (TFT) and a capacitor (C), specifically as figure 1 Shown in: including driving transistor DTFT, switching transistor T5' and storage capacitor C st . Among them, the switch transistor T5' is controlled by the scan line signal V s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G3/3233G09G3/3241G09G2300/0819G09G2300/0861G09G2310/0251
Inventor 青海刚祁小敬
Owner BOE TECH GRP CO LTD
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