White Pixel Transparent Layer Colorant Ratio for Luminance
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Solution Overview
Problem
In liquid crystal displays, the inclusion of red, green, and blue pixels with color filters reduces the luminance of images due to light absorption, necessitating the introduction of a white pixel without a color filter to enhance luminance and color representation.
Innovation Solution
A display device incorporating a white pixel with a transparent layer containing a specific ratio of green and blue colorants, which matches the color coordinates of the white pixel to those produced by the red, green, and blue pixels, thereby improving color quality and reducing color variation with viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used in red, green, and blue pixels, then color representation is achieved, but luminance is reduced due to light absorption
Solution Approach 1:
The display panel is segmented into multiple pixel types: white pixels without color filters for high luminance, and color pixels (red, green, blue) with color filters for color representation. This segmentation allows each pixel type to optimize for its specific function, resolving the contradiction between luminance and color filtering.
Solution Approach 2:
Different regions of the display panel have different optical properties. White pixels use a transparent layer without color filters to maximize light transmission and luminance, while color pixels use colored filters for accurate color representation. This local differentiation allows the system to achieve both high luminance and accurate color representation simultaneously.
2Illumination intensity
If white pixels without color filters are introduced, then luminance is increased, but color coordination with other pixels becomes problematic
Solution Approach 1:
The transparent layer in white pixels contains green and blue colorants in specific ratios (green colorant 5-10 wt%, blue colorant 2-5 wt%) to adjust the optical properties. By carefully controlling these parameters, the white pixels achieve color coordinates that match the white points produced by combining red, green, and blue color pixels, thus resolving the color coordination issue while maintaining high luminance.
Solution Approach 2:
The transparent layer uses a composite material system containing both green colorant (e.g., coumarin derivative) and blue colorant (e.g., phenolic compound) in specific proportions. This composite approach allows precise tuning of the white point color coordinates to match the combined output of the three primary color pixels, achieving both high luminance and color accuracy.
3Manufacturing precision
If transparent layer with colorants is used in white pixel, then color quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the transparent layer composition: green colorant at 5-10 wt% and blue colorant at 2-5 wt%. These parameter specifications provide clear manufacturing guidelines that balance color accuracy with manufacturing feasibility, avoiding excessive complexity while achieving the desired color coordinates.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution increases the luminance and color quality of the displayed image by ensuring the white pixel's color coordinates align with those of the red, green, and blue pixels, enhancing lateral visibility and color representation.
Implementation Method 1
a transparent layer positioned at a white pixel and including a green colorant and a blue colorant
Implementation Method 2
the white color coordinates represented by the white pixel are substantially equal to the white color coordinates represented together by the plurality of color pixels
Data Source
AI summary
A display device according to an exemplary embodiment includes: a plurality of color filters positioned at a plurality of color pixels and representing different colors; and a transparent layer positioned at a white pixel and including a green colorant and a blue colorant, wherein white color coordinates represented by the white pixel are substantially equal to white color coordinates represented together by the plurality of color pixels.