Display device and its control method

By dynamically adjusting the threshold compensation period based on pixel brightness statistics, the OLED display device effectively reduces in-plane brightness variations, improving display quality.

JP7891849B2Active Publication Date: 2026-07-17WUHAN TIANMA MICRO ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
WUHAN TIANMA MICRO ELECTRONICS CO LTD
Filing Date
2022-05-27
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Variations in threshold voltage of drive transistors in OLED display devices cause in-plane brightness inconsistencies within the display area, necessitating an optimal compensation period that varies with the current flowing through the drive transistor.

Method used

A display device and control method that dynamically adjusts the threshold compensation period based on statistical values of pixel brightness, using a control circuit to determine and control the pixel circuit accordingly, incorporating a brightness data calculation unit and pulse width control unit to optimize the compensation period.

Benefits of technology

This approach reduces brightness variations within the display area by dynamically adjusting the threshold compensation period, enhancing video quality by minimizing luminance inconsistencies.

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Abstract

To reduce a variation in luminance in a display area.SOLUTION: A display device includes multiple pixels, and a control circuit for controlling luminance of the multiple pixels. Each pixel of the multiple pixels includes a light emitting element, and a pixel circuit for controlling light emission of the light emitting element. The pixel circuit includes a drive transistor for supplying current to the light emitting element, and a holding capacitor for holding voltage for controlling current supplied to the light emitting element by the drive transistor. The control circuit determines a statistical value of luminance of a pixel shown by a video frame by a predetermined method, determines a threshold compensation period of a holding capacitor for the drive transistor on the basis of the statistical value, and controls the pixel circuit on the basis of the threshold compensation period.SELECTED DRAWING: Figure 6
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