Multi-Primary Color Display with Four Sub-Pixels

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Solution Overview

Problem

Conventional displays using three primaries (red, blue, green) fail to accurately display natural colors like sky blue or gold due to limited color space and reduced illumination when attempting to extend the color gamut.

Innovation Solution

Incorporating a display device or color filter with pixels or units that utilize four sub-pixels, including a yellow or cyan primary, with specific coordinates and contrast ratio proportions within the CIE 1931 chromaticity diagram to enhance color representation and maintain or improve illumination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If three primaries (red, green, blue) are used for color mixing, then the display structure is simple, but the color space is limited and cannot display all natural colors

Engineering Contradiction:

Improvecolor space coverageVSAvoidnumber of sub-pixels

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Each pixel is divided into four sub-pixels instead of three, with each sub-pixel responsible for displaying a specific primary color (red, green, blue, and yellow/cyan). This segmentation allows the display to cover a broader color space while maintaining a manageable structural complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extends the traditional three-primary color space by adding a fourth primary color dimension (yellow or cyan). This dimensional expansion in the chromaticity diagram enables the display to represent natural colors that fall outside the conventional RGB triangular color space

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If the three primaries are saturated to extend color space, then the color space is extended, but the illumination of the display is reduced

Engineering Contradiction:

Improvecolor spaceVSAvoiddisplay illumination

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent changes the parameters of the color display system by introducing a fourth primary color with specific chromaticity coordinates. This parameter change allows for broader color space coverage while maintaining appropriate illumination levels, as the fourth primary can be positioned to complement rather than compete with the traditional three primaries for luminance efficiency

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If a new primary outside the triangular color space is added, then the color space is extended and illumination is maintained, but the device complexity increases

Engineering Contradiction:

Improvecolor space extensionVSAvoidpixel structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The pixel is segmented into four distinct sub-pixels, each with a specific function for displaying one of the four primary colors. This segmentation strategy enables color space extension while keeping the structural complexity manageable through functional specialization

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The four-sub-pixel structure serves multiple functions: it extends the color space beyond the traditional RGB triangle, maintains illumination efficiency, and provides flexibility in displaying a wider range of natural colors. This multi-functionality justifies the increased complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8040027B2Multi-primary color display and color filter

Publication Date: 2011.10.18 AU OPTRONICS CORP

AI summary

When the coordinates of multiple primaries are set within specific ranges in a chromaticity diagram (e.g. the CIE 1931 chromaticity diagram), the proportion of the contrast ratio of one primary to the contrast ratio of the other primary should conform to some requirements to achieve the white balance of dark-state, so as to effectively display the natural color and mitigate the color shift of low-luminance images.