Display Device Image Processor Gain Adjustment for Optical Illusion
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Solution Overview
Problem
Existing display devices suffer from optical illusions where a pure color region appears dingy when surrounded by a brighter region, due to the application of gain that affects luminance and saturation, particularly in reflective display devices under varying light conditions.
Innovation Solution
A display device with an image processor that adjusts the gain of pixel regions to ensure the brightness of adjacent regions is lower than the primary color region, using a combination of sub-pixels with specific color filters and area ratios to maintain luminance and saturation, and applies a reverse gain factor to prevent dinginess by reducing the brightness of brighter regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If gain is applied to enhance luminance of pixels, then visual quality of the image is improved, but optical illusion occurs where pure color regions look dingy when surrounded by brighter regions
Solution Approach 1:
The patent applies different gain values to different pixel regions based on their local characteristics. Specifically, when a first pixel region with a first color is adjacent to a second pixel region with a second color having higher luminance, the image processor applies a first gain to the first pixel region and a second gain (lower than the first gain) to the second pixel region. This local differentiation of gain values prevents the optical illusion where pure color regions appear dingy next to brighter regions, while still enhancing overall luminance where appropriate.
2Illumination intensity
If gain is applied uniformly to all pixels, then overall luminance is enhanced, but saturation of adjacent color regions is compromised
Solution Approach 1:
The patent implements local quality by determining different gain values for different pixel regions based on their color characteristics and luminance relationships. The image processor identifies adjacent pixel regions with different colors and luminance levels, then applies higher gain to regions that would otherwise appear dingy and lower gain to brighter regions, thereby maintaining color saturation while enhancing overall luminance.
Solution Approach 2:
Instead of applying uniform gain enhancement to all pixels, the patent inverts the approach by applying differential gain where the brighter adjacent region receives less gain than the pure color region. This inversion of the expected uniform enhancement pattern prevents the optical illusion effect and maintains color fidelity.
Data Source
AI summary
According to an aspect, a display device includes: a display unit including a plurality of pixels; and an image processor configured to generate an image signal for displaying an image on the display unit. When the image processor causes the display unit to display the image such that a first pixel region that displays a first color is adjacent to a second pixel region that displays a second color and that has luminance higher than luminance of the first color, the image processor applies gain to an image signal corresponding to a pixel in the second pixel region to make brightness of the second pixel region lower than brightness of the first pixel region.