Display Sub-Pixel Boundary Control for Streak Prevention
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Solution Overview
Problem
Display devices using liquid crystal or OLED panels often experience black or bright streaks at the boundaries of adjacent display regions due to unlit sub-pixels being visually recognized as dark areas or mixed colors, which detract from image visibility.
Innovation Solution
A display device with a controller that inputs signals to sub-pixels in a halftone manner in the boundary sections of adjacent display regions, ensuring that both unlit and fully lit sub-pixels are gradually illuminated to reduce luminance changes and prevent streaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sub-pixels contributing to single color display are separated from each other in boundary pixels, then each sub-pixel can be controlled independently, but unlighted areas are visually recognized as black streaks
Solution Approach 1:
The patent introduces an intermediary control mechanism that adjusts the luminance of sub-pixels in boundary sections. Specifically, it lights sub-pixels that do not contribute to the single color display in a halftone manner, using them as intermediary elements to bridge the visual gap between separated sub-pixels and prevent the perception of black streaks.
Solution Approach 2:
The patent changes the luminance parameter of sub-pixels in boundary sections by controlling their lighting intensity. It adjusts the drive signals to light non-contributing sub-pixels at reduced intensity (halftone manner), thereby changing their visual impact from completely dark (causing black streaks) to partially illuminated (blending the transition).
2Illumination intensity
If sub-pixels contributing to single color display are placed adjacent to each other in boundary pixels, then color mixing is enhanced, but different single colors are mixed and recognized as bright streaks
Solution Approach 1:
The patent applies local quality control by differentiating the treatment of sub-pixels based on their location. In boundary sections, it selectively lights only certain sub-pixels (those not contributing to the single color display) in a halftone manner, while keeping other sub-pixels at their normal control. This localized approach prevents color mixing issues at boundaries while maintaining efficiency in non-boundary areas.
Solution Approach 2:
The patent applies partial action by lighting only the necessary subset of sub-pixels in boundary sections. Instead of lighting all sub-pixels or controlling them uniformly, it selectively lights only the non-contributing sub-pixels at reduced intensity, which is sufficient to prevent bright streaks without causing unnecessary color mixing or reducing overall display efficiency.
3Device complexity
If uniform lighting control is applied to all sub-pixels in boundary sections, then control simplicity is maintained, but both black and bright streaks cannot be prevented simultaneously
Solution Approach 1:
The patent segments the pixel array into distinct regions: boundary sections and non-boundary sections. It applies different control strategies to each segment. In boundary sections, it selectively controls specific sub-pixels (lighting non-contributing ones in halftone manner), while in non-boundary sections, it uses standard control. This segmentation allows complex streak prevention only where necessary, maintaining overall system simplicity.
Solution Approach 2:
The patent implements local quality control by applying enhanced control measures only to boundary sections where streaks occur, rather than uniformly to the entire display. Within boundary sections, it further differentiates between contributing and non-contributing sub-pixels, applying halftone lighting only to the latter. This localized approach prevents streaks without unnecessarily complicating the control of the entire display system.
Data Source
AI summary
According to an aspect, a display device includes: a display panel including a plurality of pixels; at least three of a first sub-pixel in a first color, a second sub-pixel in a second color, a third sub-pixel in a third color, and a fourth sub-pixel in a fourth color, the three sub-pixels being included in each of the pixels; and a controller configured to input an input signal to the first sub-pixel to the fourth sub-pixel. When display is performed in a plurality of display regions in respective single colors adjacent to each other in the display panel, the controller inputs a signal for lighting a sub-pixel that does not contribute to one of the single colors in a halftone manner, in a pixel included in a boundary section of the adjacent display regions.