Self-Luminous Display Panel Brightness Control via Moving Non-Light Areas
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Solution Overview
Problem
Self-luminous display panels, such as OLED and micro LED panels, face challenges in controlling display brightness levels without causing local abrupt changes in brightness, which can lead to flicker due to the adjustment of non-light-emitting areas' widths.
Innovation Solution
A display driver and method that successively moves non-light-emitting areas with gradually changing widths at the edge of the display panel during a frame period, controlled by emission pulse widths, to smoothly adjust the display brightness level while minimizing local brightness changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If emission pulse widths are adjusted to control display brightness level, then brightness control is achieved, but local abrupt changes in brightness occur causing flicker
Solution Approach 1:
The non-light-emitting areas are segmented into multiple sub-areas with different widths (first, second, and third non-light-emitting areas) arranged in a specific sequence. This segmentation allows the total non-light-emitting area to be divided into portions that are gradually changed during the frame period, preventing abrupt brightness transitions while maintaining effective brightness control through pulse width modulation.
2Illumination intensity
If non-light-emitting area widths are changed to adjust brightness, then brightness control is achieved, but image smoothness deteriorates due to abrupt brightness changes
Solution Approach 1:
The widths of the non-light-emitting areas are dynamically changed during the frame period. The emission control circuitry generates control signals that progressively adjust the widths of the first, second, and third non-light-emitting areas from their initial to final values, creating a dynamic transition that maintains image smoothness while achieving brightness adjustment.
Solution Approach 2:
The control signals are generated in advance during the frame period to progressively adjust the non-light-emitting area widths before the display is updated. This preliminary action ensures that the transition between brightness levels is smooth and prevents abrupt changes that would degrade image quality.
Data Source
AI summary
A display driver comprises drive circuitry and emission control circuitry. The display driver is configured to drive a display panel. The display panel may be a self-luminous display panel. The emission control circuitry is configured to generate a control signal to control the display panel during a first frame period to successively move a plurality of non-light-emitting areas successively inserted at an end of a display area of the display panel in a predetermined direction, the plurality of non-light-emitting areas having gradually changing widths in the predetermined direction.