Light Emitting Unit Structure for In-Plane Color Uniformity

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Solution Overview

Problem

Existing light emitting units for surface light sources, displays, and lighting apparatuses face challenges in achieving uniformity of in-plane colors due to direct light entry into optical components without passing through wavelength conversion members, leading to color unevenness.

Innovation Solution

Incorporating a color unevenness prevention structure, such as a reflection section or wavelength conversion section, between light emitting sections to suppress direct light entry into optical components, ensuring light passes through wavelength conversion members for uniform color emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If light is emitted directly from the light source into the optical component, then the light transmission efficiency is improved, but the color uniformity deteriorates due to direct light entry bypassing wavelength conversion

Engineering Contradiction:

Improvelight transmission efficiencyVSAvoidcolor uniformity

Core Design Contradiction:

Use of energy by moving objectVSStability of the object's composition

Solution Approach 1:

A reflection section is introduced as an intermediary element between the light source and optical component. This reflection section redirects light that would otherwise travel directly to the optical component, forcing it to pass through the wavelength conversion member first. The reflection section acts as a mediator that modifies the light path to ensure color conversion occurs before light enters the optical component, thereby maintaining color uniformity while preserving transmission efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The wavelength conversion member is positioned such that light must undergo wavelength conversion before reaching the optical component. By arranging the optical paths and using the reflection section, the patent ensures that wavelength conversion happens in advance (preliminarily) to light entry into the optical component. This preliminary wavelength conversion prevents color unevenness from occurring in the first place.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If a color unevenness prevention structure is added to suppress direct light entry, then the color uniformity is improved, but the device complexity increases

Engineering Contradiction:

Improvecolor uniformityVSAvoidstructure complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The reflection section is integrated with existing structural elements of the light emitting unit. Rather than adding a completely separate component, the reflection section is merged with the housing or mounting structure that already holds the light source and wavelength conversion member. This merging approach adds the necessary light path control function while minimizing increases in overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The reflection section serves multiple functions: it redirects light paths to ensure wavelength conversion occurs, it helps define the optical cavity, and it can contribute to the structural integrity of the light emitting unit. By making the reflection section multi-functional, the patent reduces the need for additional dedicated components, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 approach enhances the uniformity of in-plane colors by reducing direct light entry into optical components, preventing color unevenness and improving the overall color consistency of light emitted.

Implementation Method 1

a wavelength conversion member (30), the wavelength conversion member converting a wavelength of light emitted from the light source (10)

Methodology Applied

Scientific EffectWavelength conversion: Fluorescence

Implementation Method 2

a color unevenness prevention structure suppressing direct entering of light from the light source into the optical component

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 3

using a reflection section or light absorber between adjacent light emitting sections

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS20240248249A1Light emitting unit, display, and lighting apparatus

Publication Date: 2024.07.25 SATURN LICENSING LLC

AI summary

There are provided a light emitting unit that enhances the uniformity of in-plane colors, as well as a display and a lighting apparatus that include such a light emitting unit thereon. The light emitting unit includes: a plurality of light emitting sections each having a light source and a wavelength conversion member, the wavelength conversion member converting a wavelength of light emitted from the light source; an optical component having a light incident surface in opposition to the plurality of light emitting sections; and a color unevenness prevention structure suppressing direct entering of light from the light source into the optical component.