RGBW Subpixel Layouts for High Brightness Displays
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Solution Overview
Problem
Conventional RGB color displays struggle to accurately reproduce the brightness and saturation of natural images, as they are limited by their additive color system, leading to reduced brightness of non-saturated colors and desaturation of saturated colors, which does not align with the real-world color formation by subtractive processes.
Innovation Solution
The introduction of an additional White subpixel in RGBW liquid crystal displays, which significantly increases the brightness of non-saturated colors and allows for increased saturation of RGB primaries, along with the use of Gamut Mapping Algorithms and SubPixel Rendering techniques to maintain color accuracy and optimize display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional RGB additive color system is used, then color display capability is achieved, but brightness of non-saturated colors is reduced and saturation of saturated colors is decreased
Solution Approach 1:
The invention segments the color display function by separating the brightness provision (white subpixel) from the color provision (RGB subpixels). This segmentation allows independent optimization of brightness and color saturation, resolving the contradiction where conventional RGB systems must compromise both.
Solution Approach 2:
The invention creates a composite subpixel structure combining four color primaries (RGBW) instead of the conventional three. This composite approach integrates the advantages of both saturated color display (from RGB) and high brightness (from W), eliminating the trade-off between brightness and color accuracy.
2Illumination intensity
If additional White subpixel is added to increase brightness, then brightness increases significantly, but device complexity increases
Solution Approach 1:
The white subpixel serves multiple functions: it provides high brightness for non-saturated colors, acts as a luminance reference, and enables gamut mapping operations. This multi-functionality justifies the additional complexity by delivering multiple benefits from a single added element.
Solution Approach 2:
The invention changes the fundamental parameter of subpixel color primaries from three (RGB) to four (RGBW). This parameter change enables new display capabilities and brightness levels while the associated complexity is managed through systematic gamut mapping algorithms and subpixel rendering techniques.
3Illumination intensity
If RGB subpixels are made larger to increase aperture ratio, then brightness improves, but resolution decreases
Solution Approach 1:
The invention resolves the resolution-brightness trade-off by adding a temporal and computational dimension through gamut mapping algorithms and subpixel rendering. These processing techniques effectively increase the usable resolution from the physical subpixel array, allowing larger aperture ratios without sacrificing perceived resolution.
Data Source
AI summary
High brightness displays comprising subpixel repeating groups having at least white with a number of colored subpixels are disclosed. Colored subpixels may comprise: red, blue, green, cyan or magenta in these various embodiments.