Subpixel Rendering Circuitry for Reduced Display Driver Size
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Solution Overview
Problem
Subpixel rendering processes in display devices require large circuit sizes for gamma conversion and inverse gamma conversion, leading to increased circuit size and complexity, particularly in OLED and LCD panels.
Innovation Solution
The implementation of a subpixel rendering circuitry that calculates squared grayscale values and uses correction values based on a gamma value to generate output image data, replacing gamma conversion and inverse gamma conversion calculations, which reduces circuit size by performing square calculations and compensating errors with correction values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gamma conversion and inverse gamma conversion are performed using LUT or power calculation circuits, then accurate grayscale values are achieved, but circuit size increases significantly
Solution Approach 1:
The patent transforms the gamma conversion problem from direct power calculation (γ power) to a two-step process: first calculating square values (2 power), then applying correction values to approximate the final grayscale. This parameter transformation reduces circuit complexity while maintaining acceptable accuracy, as square calculation circuits are smaller than general power calculation circuits, and correction values can be implemented with simpler addition circuits rather than full LUTs.
Solution Approach 2:
The patent divides the gamma conversion process into separate stages: a square calculation stage and a correction stage. The subpixel rendering circuitry first calculates squared grayscale values, then adds correction values based on the relationship between input and output grayscale values. This segmentation allows each stage to use optimized, smaller circuits rather than requiring a complete LUT or complex power calculation circuit for the entire gamma conversion.
2Manufacturing precision
If subpixel rendering process is implemented with gamma conversion, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent changes the computational parameters from direct gamma power calculation to square calculation followed by correction value addition. This parameter substitution simplifies the mathematical operations required, reducing circuit complexity while preserving the subpixel rendering functionality that enhances display quality through anti-aliasing and edge smoothing.
Solution Approach 2:
The patent introduces correction values as an intermediary element between the square calculation and final grayscale output. These correction values compensate for the approximation error introduced by using square calculation instead of full gamma power calculation, thereby maintaining display quality without requiring complex gamma conversion circuits.
Data Source
AI summary
A system and method for rendering subpixels comprising performing an eight-color halftoning process on the second image data to generate third image data which describe a grayscale value of each of an R subpixel, a G subpixel and a B subpixel of each pixel with one bit, generating the third image data by performing a dithering process on the second image data using a dither value selected from elements of the dither table, when the third image data associated with a pixel of interest of the display panel is generated, and driving the display panel in response to the third image data.