Sub-pixel Rendering for Display Devices to Eliminate Color Overlap
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Solution Overview
Problem
Display devices face issues with image clarity due to overlapping colors when displaying high-resolution content on low-resolution panels, particularly in sub-pixel rendering methods like direction subpixel-based down-sampling, which can result in a vague image.
Innovation Solution
A method and device that calculate grayscale values and weighted factors for sub-pixels, allowing for selective filling of grayscale values into corresponding sub-pixels to enhance image resolution and eliminate overlapping colors, using equations to determine maximum grayscale degrees and weighted sums for accurate color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sub-pixel rendering is used to enhance space resolution, then the space resolution is improved, but color overlap occurs on edge areas causing image vagueness
Solution Approach 1:
The patent applies local quality by differentiating processing methods for different pixel types. Pure-color pixels (with only one base-color sub-pixel having non-zero grayscale value) are handled differently from non-pure-color pixels. For pure-color pixels, grayscale values are selectively filled into corresponding sub-pixels of current or previous sampled pixels based on location, avoiding color overlap. For non-pure-color pixels, weighted factors are calculated based on maximum grayscale degree to determine how grayscale values are distributed, preventing color confusion at edges while maintaining space resolution enhancement.
2Measurement precision
If high resolution content is displayed on low resolution devices, then the detail definition is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent uses copying by creating a sampled image from the original high-resolution image through down-sampling. The sampled image contains reduced resolution data that can be displayed on low-resolution devices. By copying essential visual information at lower resolution and using sub-pixel rendering to reconstruct details, the system achieves high detail definition on low-resolution displays without requiring complex manufacturing of high-resolution physical panels.
Solution Approach 2:
The patent exploits the sub-pixel dimension (RGBW sub-pixels within each pixel) to achieve resolution enhancement. By utilizing the spatial arrangement and individual control of sub-pixels, the system effectively multiplies the displayable resolution beyond the physical pixel count. This dimensional approach allows high-resolution content display on low-resolution devices by leveraging the sub-pixel level as an additional resolution dimension.
Data Source
AI summary
A display device and the displaying method are disclosed. The method includes calculating grayscale degrees of the base-color sub-pixel of the sub-pixels of the current original pixel, selecting a maximum grayscale degree from the grayscale degrees, determining a plurality of weighted factors corresponding to the current sampled pixel of the sampled image in accordance with the maximum grayscale degree, and calculating a weighted sum of grayscale values of the base-color sub-pixels of the current original pixel and the adjacent original pixels by the weighted factors to obtain the grayscale values of the base-color sub-pixels of the current sub-pixel of the current sampled pixel. In this way, the overlapped color issue may be eliminated so as to obtain a clear image.