RGBW Display Image Processing for Perceived Contrast Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
RGBW type display devices calculate color contrast ratio for the entire frame without considering the distance between pixels and color differences, leading to a discrepancy from the perceived color contrast ratio by human viewers.
Innovation Solution
A display device with an image processing unit that converts three-color input images into four-color data, calculating a color contrast ratio using luminance weights, hue weights, and block absolute values to account for pixel distances and color differences, thereby improving the perceived color contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the RGBW type display device calculates color contrast ratio for the entire frame without considering pixel distance and color differences, then the calculation process is simple, but the calculated color contrast ratio does not match the perceived color contrast ratio by human viewers
Solution Approach 1:
The patent segments the image processing into multiple stages: converting three-color input images to four-color image data, calculating luminance values and hue values for each pixel, determining luminance weights and hue weights separately, and finally computing the color contrast ratio. This segmentation allows each processing stage to focus on specific aspects of color perception, improving accuracy while maintaining manageable complexity through modular processing.
Solution Approach 2:
The patent applies local quality by calculating luminance weights and hue weights differently based on the specific characteristics of each pixel region. Luminance weights are determined based on luminance values, while hue weights are determined based on hue values, allowing the color contrast ratio calculation to adapt to local color characteristics rather than applying a uniform calculation across the entire frame.
2Measurement precision
If the display device uses traditional color contrast ratio calculation method, then the processing speed is fast, but the display quality does not align with human perception
Solution Approach 1:
The patent performs preliminary actions by pre-calculating luminance values and hue values for each pixel before computing the color contrast ratio. By preparing these intermediate values in advance and organizing them into structured data formats, the patent enables more accurate perception-based calculations without excessive computational overhead during the final contrast ratio computation.
Solution Approach 2:
The patent changes parameters by introducing luminance weights and hue weights as additional variables in the color contrast ratio calculation. These weights are derived from luminance values and hue values respectively, transforming the traditional single-parameter contrast calculation into a multi-parameter calculation that better reflects human color perception while maintaining computational efficiency through systematic parameter management.
Data Source
AI summary
Provided are a display device and an image processing method thereof. The display device according an embodiment includes a display panel including pixels formed of red, green, blue, and white sub pixels, an image processing unit that converts a three-color input image supplied to the red, green, blue, and white sub pixels into four-color image data, calculates a color contrast ratio using a luminance weight and a hue weight by scaling luminance and hue values of the input image, and outputs an output image by considering the color contrast ratio, and a timing controller which aligns and outputs the output image from the image processing unit.