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Pixel internal compensation circuit and driving method

An internal compensation, pixel technology, applied in static indicators, instruments, etc., can solve the problems of compensation failure, B point cannot be charged, etc., to improve the compensation effect and increase the detection time.

Active Publication Date: 2019-12-24
SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The detection process of the threshold voltage Vth needs to be satisfied for a long enough time, otherwise point B cannot be fully charged, which directly leads to the failure of the final compensation
Therefore, this internal compensation method is not suitable for high-resolution panels

Method used

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  • Pixel internal compensation circuit and driving method
  • Pixel internal compensation circuit and driving method

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Embodiment Construction

[0032] see image 3 , which is a schematic circuit diagram of a preferred embodiment of the pixel internal compensation circuit of the present invention. The preferred embodiment is a 4T1C circuit, including thin film transistors T1-T4, and a capacitor C1. The three control signals are SCAN1, SCAN2 and SCAN3, respectively. Correspondingly control the three thin film transistors T3, T4 and T1, and T2 is the driving TFT in the circuit. T1 is connected to node A and a data line (data line) to input data voltage Vdata, T3 is connected to node A and reference voltage Vref, and T4 is connected to node B and initial voltage Vini. In the present invention, the data line only provides Vdata, and there is no need to switch between Vdata and Vref as in the prior art.

[0033] The pixel internal compensation circuit of the present invention mainly includes: T1, the gate is connected to the control signal SCAN3, the source and the drain are respectively connected to the data voltage Vdata...

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Abstract

A pixel internal compensation circuit. The pixel internal compensation circuit comprises: a first film transistor (T1), wherein a gate electrode thereof is connected to a third control signal (SCAN3), and a source electrode and a drain electrode thereof are connected to a data voltage (Vdata) and a first node (A); a second film transistor (T2), wherein a gate electrode thereof is connected to the first node (A), and a source electrode and a drain electrode thereof are connected to a second node (B) and a high power supply potential (OVDD); a third film transistor (T3), wherein a gate electrode thereof is connected to a first control signal (SCAN1), and a source electrode and a drain electrode thereof are connected to the first node (A) and a reference potential (Vref); a fourth film transistor (T4), wherein a gate electrode thereof is connected to a second control signal (SCAN2), and a source electrode and a drain electrode thereof are connected to the second node (B) and an initial potential (Vini); a capacitor (C1) connected to the first node (A) and the second node (B); and an OLED connected to the second node (B) and a low power supply potential (OVSS). Further provided is a method for driving a pixel internal compensation circuit. The circuit and driving method can effectively increase the detection time of threshold voltage compensation by means of parallel driving, thereby improving the compensation effect.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel internal compensation circuit and a driving method. Background technique [0002] According to the driving method, OLED display devices can be divided into two categories: passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED). Among them, AMOLED has pixels arranged in an array, belongs to the active display type, has high luminous efficiency, and is usually used as a high-definition large-size display device. AMOLED is a current-driven device, and the brightness is determined by the current flowing through the OLED itself. Most existing chips (IC) only transmit voltage signals, so the AMOLED pixel drive circuit needs to complete the task of converting voltage signals into current signals. [0003] Active Matrix Light Emitting Diode (AMOLED for short) realizes the display effect by driving TFT to control the current flowing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3233
CPCG09G3/3233
Inventor 何健许神贤
Owner SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD