Image Display Apparatus Signal Processing for Luminance and Color
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image display technologies, such as color liquid-crystal display apparatuses, face issues with increased power consumption due to enhanced performance, luminance, and color reproduction range, leading to color dullness, particularly with the simultaneous contrast phenomenon, especially in yellow colors.
Innovation Solution
An image display apparatus with a signal processing section that operates in an HSV color space with an added fourth color, adjusting sub-pixel signal values using an extension coefficient to enhance luminance of all sub-pixels, including red, green, blue, and white, while reducing backlight luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance of the white-color display sub-pixel is increased to improve overall display luminance, then the power consumption of the backlight can be reduced, but the luminance of each of the red-color, green-color, and blue-color display sub-pixels does not increase, causing color dullness due to simultaneous contrast
Solution Approach 1:
The patent changes the parameters of the color signal processing by introducing an extension coefficient α0 that scales the color signals (Ri, Gi, Bi) in addition to calculating the white signal W. This parameter change allows simultaneous enhancement of both the white sub-pixel luminance and the color sub-pixel luminance, resolving the contradiction between improving display luminance and preventing color dullness.
Solution Approach 2:
The patent extends the traditional three-color signal processing (R, G, B) to a four-dimensional space by adding the white color dimension. The signal processing section now handles four output signals (Ro, Go, Bo, W) instead of three, creating an extended color space that enables independent control of both white luminance and color saturation, thus solving the simultaneous contrast problem.
2Loss of energy
If the power consumption is reduced by lowering backlight luminance, then energy efficiency improves, but the display luminance and color reproduction quality deteriorate
Solution Approach 1:
The patent enables the display system to generate its own enhanced luminance through the white-color display sub-pixel that can emit white light directly. By utilizing the white sub-pixel's self-emissive capability and optimizing its drive signal, the system reduces dependence on high backlight luminance, thereby lowering power consumption while maintaining or enhancing display luminance through the extended color signal processing.
Data Source
AI summary
An image display apparatus includes: an image display panel having a two-dimensional matrix with (P×Q) pixels each including first, second and third sub-pixels for displaying respective first, second and third elementary colors, and fourth sub-pixel for displaying a fourth color; and a signal processing section configured to receive first, second and third sub-pixel input signals respectively provided with signal values of x1-(p, q), x2-(p, q) and x3-(p, q), and to output first, second, third and fourth sub-pixel output signals respectively provided with signal values of X1-(p, q), X2-(p, q), X3-(p, q) and X4-(p, q), which used for determining the display gradations of the first, second, third, and fourth sub-pixels, respectively, with regard to a (p, q)th pixel where notations p and q are integers satisfying equations 1≦p≦P and 1≦q≦Q.