Multi-Primary Display Pixel Luminance Control
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Solution Overview
Problem
Conventional display devices using additive color mixture of four or more primary colors face inefficiencies in light usage and lower luminance compared to those using three primary colors, due to the division of pixels into multiple sub-pixels.
Innovation Solution
A display device with a unit pixel comprising sub-pixels that include a first, second, and third sub-pixel displaying primary colors, along with a fourth sub-pixel displaying a color inside the triangle defined by the primary colors in the CIE1931 chromaticity diagram, where the luminance of the fourth sub-pixel is increased without increasing the third sub-pixel's luminance, improving brightness while maintaining high luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one pixel is divided into four or more sub-pixels for multi-primary color display, then the color reproduction range is widened, but the light usage efficiency deteriorates and luminance decreases
Solution Approach 1:
The patent dynamically adjusts the luminance allocation among sub-pixels based on the displayed color content. By controlling the fourth sub-pixel's luminance independently and prioritizing it over green and blue sub-pixels when increasing overall brightness, the system adapts light distribution to maintain high luminance while preserving wide color gamut capabilities.
Solution Approach 2:
The patent changes the luminance parameters of sub-pixels differently based on display requirements. Specifically, when increasing luminance from black to white through a predetermined hue, the fourth sub-pixel's luminance is increased without increasing the third sub-pixel's luminance after the first sub-pixel reaches predetermined luminance, optimizing light usage efficiency while maintaining color accuracy.
2Adaptability or versatility
If one pixel is divided into four or more sub-pixels for multi-primary color display, then the color reproduction range is widened, but the light usage efficiency deteriorates
Solution Approach 1:
The system dynamically optimizes light distribution among sub-pixels based on the specific color being displayed. By selectively increasing the fourth sub-pixel's luminance and controlling when the third sub-pixel increases luminance, the system reduces unnecessary light consumption while maintaining wide color gamut performance.
Solution Approach 2:
The patent implements differential luminance parameter control where the fourth sub-pixel's luminance is prioritized for increase, and the third sub-pixel's luminance increase is suppressed until specific conditions are met. This parameter optimization reduces energy waste while preserving color reproduction capabilities.
Data Source
AI summary
According to one embodiment, a display device includes a unit pixel including a first sub-pixel displaying a first color having a first hue, a second sub-pixel displaying a second color having a first hue, a third sub-pixel displaying a first color having a third hue, and a fourth sub-pixel displaying a second color having a fourth hue. The fourth hue corresponds to a point inside a triangle defined by three points corresponding to the first hue, the second hue, and the third hue. Luminance of the fourth sub-pixel is increased without increasing luminance of the third sub-pixel after luminance of the first sub-pixel reaches predetermined luminance.