Wavelength Conversion Member for Display Light Evenness
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Solution Overview
Problem
Existing light emitting devices used as surface light sources face challenges in achieving evenness of color in a plane, leading to uneven illumination and display quality.
Innovation Solution
A light emitting device is designed with a wavelength conversion member that crosses a first region surrounded by the light incident surface and extends to a second region outside, ensuring that light emitted from the source is subjected to wavelength conversion, reducing light not passing through the conversion member and enhancing color evenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional light emitting device structure is used, then the device is simple to manufacture, but the color evenness in a plane is poor
Solution Approach 1:
The wavelength conversion member is configured to extend not only in the first region (surrounded by the light incident surface) but also in a second region outside the first region. This spatial extension in an additional dimension ensures that light emitted from the light source is more uniformly converted across the entire emission area, improving color evenness without significantly complicating the manufacturing process
2Manufacturing precision
If the wavelength conversion member is extended to the second region, then color evenness is improved, but the device complexity increases
Solution Approach 1:
The wavelength conversion member integrates multiple functions: it converts light wavelength, controls light distribution, and ensures uniform color emission across both the first and second regions. By combining these functions into a single component rather than using separate elements, the device achieves improved color uniformity while avoiding excessive complexity
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 improves color evenness in a plane, resulting in higher quality illumination and display by ensuring that more light is subjected to wavelength conversion, thereby reducing color inconsistencies.
Implementation Method 1
a wavelength conversion member provided between the light source and the light incident surface, the wavelength conversion member crossing a first region and extending to a second region outside the first region
Data Source
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AI summary
A light emitting device (1) includes: a light source (10); a light guide plate (20) including a light incident surface (20A), the light incident surface (20A) facing the light source (10); and a wavelength conversion member (30) provided between the light source (10) and the light incident surface (20A), the wavelength conversion member (30) crossing a first region (S1) and extending to a second region (S2) outside the first region (S1), the first region (S1) being surrounded by the light incident surface (20A) and light paths (v1, v2) of light that is emitted from the light source (10) and enters edges of the light incident surface (20A).