Display Unit Wavelength Variation Management

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Solution Overview

Problem

Existing display and illumination units using light emitting diodes (LEDs) face challenges in maintaining consistent color quality due to significant wavelength variations, leading to visual color unevenness and increased manufacturing costs.

Innovation Solution

Incorporating a first light emitting device with a smaller wavelength variation in one region and a second light emitting device with a greater wavelength variation in another region, along with a wavelength converter to adjust the color output, allowing for improved color consistency and reduced manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a single type of light emitting device is used across all regions, then manufacturing simplicity is maintained, but wavelength variation causes visual color unevenness and degraded display quality

Engineering Contradiction:

Improvecolor consistencyVSAvoidlight emitting device configuration

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by differentiating light emitting devices based on their spatial location. First light emitting devices with smaller wavelength variations are placed in first light emitting regions where direct extraction occurs, while second light emitting devices with larger wavelength variations are placed in second light emitting regions where wavelength conversion occurs. This localized differentiation resolves the contradiction by allowing color consistency in critical regions while maintaining manufacturing simplicity in other regions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the display device into distinct regions with different light emitting device characteristics. By dividing the device into first light emitting regions and second light emitting regions with differently optimized light emitting devices, the patent achieves overall color consistency while managing the complexity through structured segmentation rather than uniform design.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If light emitting devices with small wavelength variation are used throughout, then color consistency is improved, but manufacturing costs increase due to stricter selection criteria

Engineering Contradiction:

Improvewavelength consistencyVSAvoidmanufacturing cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent reduces manufacturing costs by applying strict wavelength selection criteria only where necessary - specifically for first light emitting devices in regions where light is directly extracted and displayed. For second light emitting devices in wavelength conversion regions, larger wavelength variations are acceptable since the conversion process masks these variations. This localized quality requirement resolves the contradiction between color consistency and manufacturing cost.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If wavelength conversion is applied to all light emitting regions, then color flexibility is improved, but energy loss increases due to conversion inefficiency

Engineering Contradiction:

Improvecolor output flexibilityVSAvoidwavelength conversion energy loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent extracts wavelength conversion functionality from all regions and applies it only where necessary - specifically in second light emitting regions where color flexibility is needed. First light emitting regions directly extract and use light without conversion, eliminating unnecessary energy loss. This selective extraction of the wavelength conversion function resolves the contradiction between color flexibility and energy efficiency.

Inventive Principle:

Principle #2Taking out (Extraction)

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 reduces recognizable wavelength variations, enhancing display and illumination quality while minimizing manufacturing costs and energy loss, and allowing for adjustable color purity and design flexibility.

Implementation Method 1

a wavelength converter provided in the second light emitting regions and converting a wavelength of the first color light emitted from the second light emitting device

Methodology Applied

Scientific EffectWavelength conversion: Photoluminescence

Data Source

PatentUS11486560B2Display unit and illumination unit

Publication Date: 2022.11.01 SONY GROUP CORP

AI summary

A display unit including: a plurality of first light emitting regions from which a first color light is to be extracted; a plurality of second light emitting regions from which a color light different from the first color light is to be extracted; a first light emitting device provided in each of the plurality of first light emitting regions and emitting the first color light; a second light emitting device provided in each of the plurality of second light emitting regions and emitting the first color light having a wavelength variation greater than a wavelength variation of the first color light to be emitted from the first light emitting device; and a wavelength converter provided in the second light emitting regions and converting a wavelength of the first color light emitted from the second light emitting device.