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Pixel circuit, driving method for driving the pixel circuit and display device

A technology of pixel circuits and driving transistors, applied in static indicators, electrical digital data processing, instruments, etc., can solve problems such as lack of good solutions, increase circuit structure and operational complexity, and ensure uniformity and stability. Effect

Active Publication Date: 2013-07-17
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, driving method for driving the pixel circuit and display device
  • Pixel circuit, driving method for driving the pixel circuit and display device
  • Pixel circuit, driving method for driving the pixel circuit and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] In this embodiment, the pixel circuit structure of a common-cathode OLED display is taken as an example for illustration. The pixel circuit in the present invention is as image 3 As shown in , it includes an electroluminescent 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 first switch unit of the first switch unit terminal is connected to the first end of the storage capacitor, and the second end is connected to the data line; the second end of the storage capacitor is respectively connected to the gate of the driving transistor and the first end of the compensation unit; Threshold voltage, the second end of the compensation unit is connected to the drain of the drive transistor; the source of the drive transistor is connected to the power supply end, and the drain is connected to the first end of the is...

Embodiment 2

[0079] 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 second switching 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 third 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 connection, drain and coupling ca...

Embodiment 3

[0106] 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 compensates a threshold value voltage drift effectively to ensure the uniformity and the stability of a driving current by blocking a transistor to stop the electrical connection between the drain of a driving transistor and an organic light emitting diode and pre-storing the threshold voltage signals and the data voltage signals of the driving transistor through a storage capacitor when data is written to the storage capacitor. Further, a touch control circuit utilizes control signals of the pixel circuit in a multiplex mode, and the coupling capacitor of the touch control circuit is charged through a charging transistor when the storage capacitor is charged, so that the integration of the touch control circuit in the pixel circuit is achieved perfectly when the circuit structure and the complexity of operations are not increased.

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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IPC IPC(8): G09G3/32
CPCG06F3/0412G06F3/04184G06F3/044G09G3/3233G09G2300/0819G09G2300/0842G09G2300/0861G09G2320/043G06F3/04166G09G3/3258
Inventor 青海刚祁小敬
Owner BOE TECH GRP CO LTD
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