Display Subpixel Rendering for Edge Quality
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Solution Overview
Problem
Display devices experience color blur and line roughness issues when displaying black and white objects, leading to deteriorated display quality.
Innovation Solution
A display device with a display panel and image processor where the arrangement of sub-pixels in odd-numbered and even-numbered pixel columns differs, and sub-pixel rendering is performed to determine and improve edge rendering, reducing color blur and line roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub-pixels are arranged in a conventional pattern in all pixel columns, then manufacturing is simple, but color blur occurs at boundaries between black and white objects
Solution Approach 1:
The patent applies asymmetry by alternating the arrangement pattern of sub-pixels between odd-numbered and even-numbered pixel columns. Specifically, in odd-numbered columns, sub-pixels are arranged with a first vertical interval, while in even-numbered columns, they are arranged with a second vertical interval that is different from the first. This asymmetric alternating pattern prevents color blur at boundaries while maintaining manufacturing feasibility through a systematic design.
Solution Approach 2:
The patent implements local quality by applying different sub-pixel arrangement patterns to different locations (odd vs. even pixel columns) based on their specific needs. Each column type receives a tailored arrangement that optimizes boundary rendering in its local context, with the odd columns using one interval pattern and even columns using another, thereby addressing color blur locally where it occurs.
2Device complexity
If standard rendering is used at edges, then processing is simple, but line roughness is visually recognized
Solution Approach 1:
The patent applies preliminary action by performing sub-pixel rendering processing on pixels located at edges before final image output. The image processor identifies edge pixels and pre-processes their sub-pixel values to compensate for potential roughness, ensuring that when the image is displayed, the lines appear smooth without requiring complex post-processing or additional hardware.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the output values of individual sub-pixels based on their location and the edge characteristics. The image processor modifies the luminance or color values of sub-pixels at edge locations to compensate for rendering artifacts, thereby improving line smoothness through parameter optimization rather than structural changes.
3Stability of the object's composition
If sub-pixel intervals are uniform across all columns, then design is consistent, but display quality deteriorates at boundaries
Solution Approach 1:
The patent resolves this contradiction by introducing controlled asymmetry into the otherwise consistent sub-pixel arrangement. While maintaining a regular alternating pattern between odd and even columns, the specific vertical intervals are made different (first interval for odd columns, second interval for even columns). This provides the variation needed for accurate boundary rendering while preserving overall design consistency through the systematic alternating structure.
Data Source
AI summary
A display device includes a display panel and an image processor. The display panel includes pixels, each pixel among the pixels including sub-pixels. The image processor is configured to process image data for image display via the display panel. An arrangement of sub-pixels of a pixel in an odd-numbered pixel column of the display panel is different from an arrangement of sub-pixels of a pixel in an even-numbered pixel column of the display panel. The image processor includes an edge determiner and a sub-pixel renderer. The edge determiner is configured to determine an edge from the image data. The sub-pixel renderer is configured to perform sub-pixel rendering on pixel data about sub-pixels configured to display a same color in adjacent pixels in the odd-numbered pixel column or the even-numbered pixel column located at the edge.