Light Emitting Unit Layout to Suppress In-Plane Color Unevenness
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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 shield direct light from the source and ensure light passes through the wavelength conversion member, enhancing in-plane color uniformity by reducing direct light entry into optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting sections are arranged to provide sufficient luminance, then the luminance output is improved, but direct light from the source enters the optical component causing color unevenness
Solution Approach 1:
A reflection section is introduced as an intermediary component between the light emitting sections and the optical component. This reflection section intercepts direct light from the light source and redirects it through the wavelength conversion member, ensuring that all light entering the optical component has undergone wavelength conversion. This resolves the color unevenness issue while preserving the luminance output by maintaining the light path without loss.
2Manufacturing precision
If a reflection section is added to prevent direct light entry, then color uniformity is improved, but device complexity increases
Solution Approach 1:
The reflection section is merged with the holder that supports the wavelength conversion members. By integrating the light reflecting function into the existing holder structure, the patent achieves color uniformity without significantly increasing device complexity. The holder simultaneously performs mechanical support and optical reflection functions, eliminating the need for separate reflection components.
3Object-affected harmful factors
If the pitch between light sources is increased to reduce direct light entry, then color unevenness is reduced, but luminance output decreases
Solution Approach 1:
The reflection section serves as an intermediary that allows light sources to be positioned closer together (maintaining high luminance output) while still preventing direct light entry into the optical component. By redirecting light through the wavelength conversion member, the system achieves both high luminance and color uniformity without requiring increased pitch between light sources.
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
The solution effectively prevents color unevenness by reducing direct light entry into optical components, thereby enhancing the uniformity of in-plane colors in light emitting units, displays, and lighting apparatuses.
Implementation Method 1
a wavelength conversion member (30), and a color unevenness prevention structure (40). The wavelength conversion member (30) converts a wavelength of light emitted from the light source (10)
Data Source
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.