Dithered Pixel Brightness Control in Display Panels
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Solution Overview
Problem
Existing display and illumination technologies using pixelated structures face limitations in achieving fine control over brightness levels, as digital to analog conversion (DAC) circuits can only operate at preset levels, leading to unstable illumination and difficulty in producing desired optical brightness levels for applications requiring precise gray scales or texture representation.
Innovation Solution
A system that includes a digital controller and a DAC circuit module with preset levels, allowing for dithered pixel brightness control by operating pixels at different DAC levels within stable and unstable regions to achieve perceived average brightness levels, using temporal or spatial integration techniques to generate finer brightness levels beyond standard DAC resolutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If DAC circuit module operates at preset DAC levels, then device complexity is reduced, but brightness control precision deteriorates
Solution Approach 1:
The patent divides a block of adjacent pixels into multiple groups and operates different pixels within each group at different DAC levels (first DAC level, second DAC level, third DAC level) to achieve spatial dithering. This segmentation allows the system to maintain simple preset DAC levels while achieving finer perceived brightness control through the combined effect of multiple pixel groups.
Solution Approach 2:
The patent employs temporal dithering by alternating between different DAC levels across sequential frames. Pixels that would otherwise be stuck at a single DAC level are switched between different levels in different frames, creating a time-averaged perceived brightness that falls between the discrete DAC levels. This periodic switching enables fine brightness control without requiring intermediate DAC levels.
2Adaptability or versatility
If pixels operate within unstable brightness region, then brightness control flexibility increases, but illumination stability deteriorates
Solution Approach 1:
The patent performs dithering calculations and determines the optimal distribution of pixels across different DAC levels before actual display rendering. By pre-calculating the dither patterns and assigning pixels to specific DAC levels in advance, the system achieves fine brightness control while maintaining stable illumination during actual display, as the pixels operate at stable preset DAC levels rather than unstable intermediate values.
Solution Approach 2:
The patent introduces a dithering control mechanism that acts as an intermediary between the digital brightness value and the actual pixel operation. Instead of directly operating pixels at unstable intermediate brightness levels, the dithering controller distributes pixels across stable DAC levels according to calculated probabilities, achieving the desired intermediate brightness through statistical averaging while maintaining pixel stability.
3Manufacturing precision
If dithered pixel brightness control is implemented, then brightness control precision is improved, but device complexity increases
Solution Approach 1:
The patent implements dithering by utilizing the existing pixel array structure and DAC circuit module without requiring additional hardware components. The system leverages the natural properties of the display panel by controlling different pixels within the existing array to perform the dithering function, thereby achieving fine brightness control precision while minimizing the increase in device complexity.
Data Source
AI summary
Techniques and devices use panels or screens with pixels for display or illumination applications to achieve dithered pixel brightness beyond pixel brightness levels set by a digital to analog conversion (DAC) circuit module with a preset DAC resolution between two adjacent DAC levels. In one implementation, when a pixel is to be dictated by a digital pixel signal to operate within an unstable brightness region, a control mechanism is provided to control the DAC circuit module to operate the pixel in the block at a DAC level below the unstable brightness region or at a different DAC level above the respective unstable brightness region, to achieve a perceived brightness level within the respective unstable brightness region.