Display Driver Circuitry for Linear Brightness Control
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Solution Overview
Problem
The display brightness level of self-luminous display panels, such as OLED and micro LED panels, is challenging to control effectively due to non-linear changes with emission pulse width and the ratio of emitting to total display elements, leading to image quality deterioration and variations in gamma and chromaticity characteristics.
Innovation Solution
A display driver system comprising gamma processing circuitry, compensation circuitry, and emission pulse width control circuitry is used to process image data and control emission pulses, ensuring the display brightness level changes linearly with the brightness command value, thereby mitigating the effects of changes in the emission pulse width and ratio of emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If emission pulse width is increased to control display brightness level, then brightness control range is improved, but display brightness level changes non-linearly causing image quality deterioration
Solution Approach 1:
The patent changes the parameter of emission pulse width in a non-linear manner to achieve linear brightness control. Specifically, the emission pulse width is set to increase at a decreasing rate as brightness command values increase, compensating for the non-linear relationship between pulse width and perceived brightness. This allows the display brightness level to change linearly with brightness command values while maintaining image quality.
2Illumination intensity
If ratio of emitting display elements to total display elements is changed to control brightness, then display brightness level is improved, but gamma and chromaticity characteristics vary causing image quality deterioration
Solution Approach 1:
The patent dynamically adjusts the emission pulse width based on the brightness command value to maintain stable gamma and chromaticity characteristics. By controlling the temporal duration of emission pulses rather than the number of emitting elements, the system maintains consistent color and gamma properties across different brightness levels while achieving the desired linear brightness control.
Data Source
AI summary
A display driver comprises gamma processing circuitry, compensation circuitry, and driver circuitry. The gamma processing circuitry is configured to process the image data to generate gamma processed image data. The compensation circuitry is configured to process the gamma-processed image data, based on a ratio of a number of display elements that emit light to a total number of display elements of a display panel, to generate compensated image data. The driver circuitry is configured to drive the display panel based on the compensated image data.