Pixel drive circuit and pixel drive method

By employing a pixel driving circuit with multi-gate transistors and storage capacitors in the OLED display panel, the problem of insufficient compensation time for the threshold voltage Vth of the driving transistor under high refresh rates and high resolutions is solved, thereby improving the uniformity of light emission and display quality.

WO2026102897A1PCT designated stage Publication Date: 2026-05-21EVERDISPLAY OPTRONICS (SHANGHAI) CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
EVERDISPLAY OPTRONICS (SHANGHAI) CO LTD
Filing Date
2025-01-08
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing OLED display panels suffer from insufficient compensation time for the threshold voltage Vth of the driving transistors at high refresh rates and high resolutions, leading to hysteresis issues and affecting display quality.

Method used

The pixel driving circuit, which adopts a multi-gate transistor structure and storage capacitor design, optimizes the threshold voltage compensation of the driving transistor through the initialization unit and compensation unit, adds the voltage reset function of the fourth node, and reduces the brightness in dark state and the uniformity of light emission.

Benefits of technology

It effectively solves the problem of insufficient compensation time for the threshold voltage Vth of the driving transistor under high refresh rate and high resolution, and improves the uniformity of light emission and display quality.

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Abstract

Provided in the present invention are a pixel drive circuit and a pixel drive method. The pixel drive circuit comprises: a drive sub-circuit; a light-emission control unit, which is configured to control, under the control of an enable signal En, a positive power signal ELVDD to couple to a first node N1, and a third node N3 to couple to a fourth node N4; a data writing unit, which is configured to transmit a data signal Data to a sixth node N6 in response to a first scanning signal Sn; a first storage capacitor C1 and a second storage capacitor C2; an initialization unit, which is configured to initialize a second node N2, the fourth node N4, a fifth node N5 and the sixth node N6; and a first compensation unit, which is configured to write the positive power signal ELVDD and a threshold voltage of a drive transistor into the second node N2 in response to a first latch signal Sc. The pixel drive circuit in the present invention solves the problems of the time for compensating for a threshold voltage Vth of a drive transistor being insufficient under a high refresh rate and a high resolution, and hysteresis occurring due to the long-time operation of the drive transistor.
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