Pixel compensating circuit, method, display driving device and display device

Abstract

The invention discloses a pixel compensating circuit, a pixel compensating method, a display driving device and a display device, relates to the technical field of display, and aims to reduce the problems of a splash screen and empurpling of the display device caused by threshold voltage offset. The pixel compensating circuit comprises a first transistor; a control end of the first transistor is connected with a control signal modulation unit; an input end of the first transistor is connected with a data signal modulation unit; an output end of the first transistor is connected with a control end of a driving transistor; the output end of the first transistor is also connected with an output end of the driving transistor through a storage capacitor; an input end of the driving transistor is connected with a power signal line; the output end of the driving transistor is connected with a light emitting device; the control signal modulation unit and the data signal modulation unit modulate corresponding signals after a light emitting stage is ended, so that the grid source voltage direction at the time is opposite to the grid source voltage direction in the light emitting stage of the first transistor. The display driving device comprises the pixel compensating circuit. The pixel compensating circuit provided by the invention is used in an OLED (Organic Light-Emitting Diode) display device.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel compensation circuit and method, a display driving device and a display device. Background technique [0002] Organic light-emitting diode (Organic Light-Emitting Diode, abbreviated as OLED) display device is a self-luminous display device, which is equipped with OLED devices arranged in an array, and controls the corresponding OLED devices to emit light through thin-film transistors to realize image display. . [0003] In the prior art, due to the instability of the film formation process, the threshold voltage of the thin film transistor has a certain deviation from the target threshold voltage. Therefore, a pixel compensation circuit is installed in the OLED display device to compensate the threshold voltage of the corresponding thin film transistor. . figure 1 A 2T1C pixel compensation circuit diagram is shown, which includes a thin film transistor TFT and ...

AI Technical Summary

Problems solved by technology

Specifically, in the data writing phase T1, the first transistor TFT is controlled to be turned on by a high level, and the storage capacitor C st Charge to write the display data signal into the drive transistor; in the light-emitting stage, use the low level to control the first transistor TFT to turn off, and the storage capacitor C st Discharge, so that the drive transistor D is turned on, and the power signal drives the light emitting device L through the drive transistor D oled Lighting; drive the light-emitting device L through the 2T1C pixel compensation circuit oled The process of emitting light can be seen: the thin film transistor TFT is in the off state most of the time, and at this time the gate-source voltage is at a negative potential, which makes the gate-source voltage of the thin film transistor TFT at a negative potential for a long time, resulting in the thin film transistor TFT The threshold voltage shifts negatively, so that the thin-film transistor TFT often has the problem that it cannot be turned off during the light-emitting phase; if this problem occurs during the light-emitting phase, the low-level data signal will be written into the drive transistor during the light-emitting phase, resulting in The flickering of the corresponding light-emitting device causes OLED display devices to appear flickering, purple, etc.

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