RGB Pixel Lighting Area Layout for Color-Accurate Displays

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Solution Overview

Problem

Existing display devices face challenges in achieving optimal display quality due to variations in application conditions, requiring continuous updates and adjustments in their development.

Innovation Solution

The display device comprises red, green, and blue pixel units, each consisting of a light emitting element, a light conversion element, and a color filter. The light emitting element emits blue light, which is then converted into red or green light by the light conversion element and filtered by the color filter, with the red pixel unit having a larger lighting area than the blue pixel unit but smaller than the green pixel unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the lighting area of each pixel unit is made equal, then the manufacturing process is simplified, but the display quality and color accuracy deteriorate due to inability to optimize for different color characteristics

Engineering Contradiction:

Improvepixel unit area uniformityVSAvoiddisplay quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent applies local quality by assigning different lighting areas to different color pixel units based on their specific optical characteristics. The red pixel unit is given a larger lighting area to compensate for lower luminous efficiency, while the blue pixel unit has a smaller area. This localized optimization allows each color channel to achieve its optimal brightness and color accuracy, resolving the contradiction between manufacturing simplicity and display quality.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If the lighting area of the red pixel unit is increased to compensate for lower luminous efficiency of red light, then color brightness is improved, but the overall device area increases

Engineering Contradiction:

Improvered light brightnessVSAvoiddisplay device area

Core Design Contradiction:

Illumination intensityVSArea of stationary object

Solution Approach 1:

The patent applies parameter changes by adjusting the lighting area parameter of different pixel units according to the luminous efficiency characteristics of each color. The red pixel unit's lighting area is increased to compensate for its lower luminous efficiency, while blue and green pixel units have reduced areas. This parameter optimization achieves balanced color brightness across all channels without requiring a proportional increase in overall device area, as the total area is redistributed rather than expanded.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If different lighting areas are assigned to different pixel units to optimize color accuracy, then display quality is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvecolor accuracyVSAvoidpixel unit configuration

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent implements local quality by configuring different lighting areas for red, green, and blue pixel units according to their specific color characteristics and luminous efficiency. The red pixel unit has a larger lighting area to achieve adequate brightness, while blue and green units have smaller areas. This localized differentiation optimizes color accuracy and display quality while maintaining a relatively simple overall structure that does not require complex additional components or mechanisms.

Inventive Principle:

Principle #3Local quality

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

This configuration enhances the display quality by achieving a preferable balance in lighting areas and color conversion, resulting in improved color accuracy and overall performance.

Implementation Method 1

the light emitting element emits blue light that then passes through the light conversion element and the color filter and the blue light is converted into a red light while passing through the light conversion element

Methodology Applied

Scientific EffectLight conversion: Photoluminescence

Implementation Method 2

the blue light is converted into a red light while passing through the light conversion element

Methodology Applied

Scientific EffectColor filtering: Filter (optical)

Data Source

PatentUS12317724B2Display device

Publication Date: 2025.05.27 INNOLUX CORP

AI summary

The disclosure provides a display device including a first pixel unit and a second pixel unit. The first pixel unit configured to emit a red light, including a first light emitting element, a light conversion element and a first color filter. The second pixel unit configured to emit a blue light, including a second light emitting element and a second color filter. The first color filter is partially overlapped with the second color filter in a normal direction of the display device, and a ratio of a lighting area of the first pixel unit to a lighting area of the second pixel unit is ranged from 1.02 to 1.84.