Display Device Signal Processing Unit Color Contrast Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The addition of a white sub-pixel to liquid crystal display devices can reduce color contrast, leading to deterioration in image quality.
Innovation Solution
A display device with a signal processing unit that converts input signals to extended values in a color space including red, green, blue, and white colors, correcting color information to position it away from the white point in the color gamut, and determining an expansion coefficient to generate output signals for each sub-pixel, thereby maintaining color contrast and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white sub-pixel is added to increase luminance, then brightness is improved, but color contrast deteriorates
Solution Approach 1:
The patent applies parameter changes by transforming the color space parameters and adjusting the conversion equations to account for the white sub-pixel. The signal processing unit modifies the color conversion process by introducing expansion coefficients and correcting input values to maintain color contrast while utilizing the white sub-pixel for luminance enhancement.
Solution Approach 2:
The patent segments the color representation by separating the white component from the color components. The white sub-pixel handles luminance information while the colored sub-pixels maintain color contrast, achieving functional segmentation that resolves the contradiction between brightness and color fidelity.
2Illumination intensity
If a white sub-pixel is added to improve visibility, then luminance is increased, but image quality deteriorates
Solution Approach 1:
The patent changes the parameters of the color conversion process by introducing correction factors and expansion coefficients that account for the white sub-pixel's contribution. This allows the system to maintain image quality by adjusting how color values are transformed when the white sub-pixel is involved.
Solution Approach 2:
The signal processing unit acts as an intermediary that mediates between the white sub-pixel and the colored sub-pixels. It processes the input signals and distributes appropriate values to each sub-pixel type, ensuring that the white sub-pixel enhances visibility without compromising image quality.
3Illumination intensity
If a white sub-pixel is added to enhance brightness, then luminance is improved, but color representation deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the color conversion equations to include expansion coefficients that preserve color representation accuracy. The signal processing unit adjusts the conversion parameters dynamically to ensure that colors are accurately represented even when the white sub-pixel is used for brightness enhancement.
Solution Approach 2:
The patent segments the luminance and color information processing functions. The white sub-pixel is dedicated to luminance/brightness while the colored sub-pixels handle color representation, with the signal processing unit coordinating between them to prevent color representation deterioration.
Data Source
AI summary
According to an aspect, a display device includes an image display panel in which pixels are arranged; and a signal processing unit that converts input values of input signals including color information of a certain color represented in a reference color gamut into extended values in an extended color space to generate output signals. The signal processing unit corrects the input values of the input signals into input values of corrected input signals including color information of a corrected color so as to correct the certain color into the corrected color that is a color positioned in a direction away from a white point, determines an expansion coefficient, and obtains the output signals for first to fourth sub-pixels based on at least the corrected input signals and the expansion coefficient.