Color Display Device Subpixel Layout for Reduced Filter Loss
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Solution Overview
Problem
Current color display devices face inefficiencies due to color filter absorption loss and limited color reproduction range, particularly in middle to high definition displays, where adding white subpixels increases electrical wiring and reduces image resolution.
Innovation Solution
A color display device with a matrix array of red, green, blue, and white subpixels, where subpixels differ in area and number while maintaining equal total area, with specific layouts and black matrix configurations to minimize color filter loss and prevent image resolution degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If white subpixels are added to red, green and blue subpixels to reduce color filter absorption loss, then light source use efficiency is enhanced, but the total number of subpixels increases resulting in increased electrical wiring lines
Solution Approach 1:
The patent combines white subpixels with existing RGB subpixels in a shared pixel structure, allowing white subpixels to be controlled through the same electrical wiring infrastructure. This merging approach enables the white subpixels to reduce color filter absorption loss while avoiding proportional increases in wiring complexity, as they share control resources with the RGB subpixels.
Solution Approach 2:
The electrical wiring lines are designed to serve multiple functions by controlling both RGB subpixels and white subpixels. The same scanning lines and signal lines are used to address different subpixel types within a pixel unit, making the wiring system universal and preventing the need for separate dedicated wiring for white subpixels.
2Illumination intensity
If white subpixels are added to increase brightness per unit area, then display brightness is enhanced, but the number of signal transmission lines and scanning lines increases
Solution Approach 1:
The patent merges white subpixels into existing pixel units that share common signal transmission lines and scanning lines with RGB subpixels. This combining strategy allows white subpixels to contribute to display brightness enhancement while utilizing the same electrical infrastructure, thereby avoiding an increase in the number of signal lines.
Solution Approach 2:
The patent arranges white subpixels and RGB subpixels in a two-dimensional matrix pattern within pixel units, allowing multiple subpixel types to be controlled through the same scanning lines by varying the column address. This spatial arrangement in another dimension enables brightness enhancement without increasing the number of scanning lines.
3Manufacturing precision
If subpixels are arranged in parallel layout of three primary colors to achieve vivid color display, then color fidelity is improved, but the area of each subpixel is one third of total pixel area resulting in deficiency of light amount
Solution Approach 1:
The patent introduces asymmetry by adding white subpixels to the traditional symmetric RGB arrangement, creating pixel units with four different subpixel types. This asymmetric configuration allows certain subpixels (white and selected RGB) to have larger areas than others, enabling them to contribute more light while maintaining overall color fidelity through the presence of all primary color subpixels.
Solution Approach 2:
The patent applies local quality by making different subpixels within a pixel unit have different areas. White subpixels and selected RGB subpixels are made larger to contribute more light, while other subpixels maintain smaller areas. This local variation in subpixel quality optimizes both light output and color reproduction capabilities.
Data Source
AI summary
A color display device comprises an array of a plurality of sub-pixels including a red sub-pixel, a blue sub-pixel, a first green sub-pixel and a second green sub-pixel. The first green sub-pixel and the second green sub-pixel are smaller than that of the red sub-pixel or the blue sub-pixel. The two adjacent first green sub-pixels are arranged in a first direction, the two adjacent second green sub-pixels are arranged in the first direction. The blue sub-pixel is directly adjacent to the red sub-pixel in a second direction; the blue sub-pixel is directly adjacent to the two first green sub-pixels and the two second green sub-pixels.