Light Emission Structure With Dual Diffusers for Uniform Thin Backlights
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Solution Overview
Problem
Existing thin-profiled light emission devices face challenges in achieving uniform luminance and maintaining a thin, compact size due to limitations in light diffusing and reflecting structures.
Innovation Solution
The proposed light emission device incorporates a wiring board with light-emitting elements, a first light diffusing member, a second light diffusing member with a higher content ratio of light-diffusive material, and a wavelength converting member, along with light reflecting layers, to enhance light diffusion and reflection, thereby suppressing uneven luminance and allowing for a thinner profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a thin-profiled light emission device is designed with a single light diffusing member, then the device can be made thinner, but uneven luminance occurs due to insufficient light diffusion
Solution Approach 1:
The light diffusing function is segmented into two distinct members: a first light diffusing member with lower light-diffusive material content ratio and a second light diffusing member with higher light-diffusive material content ratio. This segmentation allows each member to perform light diffusion at different intensities, achieving uniform luminance while maintaining a thin overall device structure.
Solution Approach 2:
Different regions of the light emission device have different light diffusion requirements. The first light diffusing member is positioned in regions requiring moderate diffusion, while the second light diffusing member with higher light-diffusive material content is positioned in regions requiring stronger diffusion. This local quality differentiation ensures uniform luminance across the entire device surface.
2Illumination intensity
If light diffusing members with high light-diffusive material content are used throughout, then luminance uniformity improves, but device thickness increases
Solution Approach 1:
High light-diffusive material content is applied locally only in the second light diffusing member where it is most needed for luminance uniformity, rather than throughout the entire light diffusion path. This localized application achieves the desired luminance uniformity while minimizing the overall device thickness.
Solution Approach 2:
The light diffusing function is divided into two segments with different light-diffusive material content ratios. The first member uses lower content to maintain thinness in regions where strong diffusion is not critical, while the second member uses higher content only where needed to correct luminance uniformity issues.
3Illumination intensity
If multiple light diffusing members with different light-diffusive material content ratios are used, then luminance uniformity is suppressed, but device complexity increases
Solution Approach 1:
The light diffusing function is segmented into two members with clearly defined different light-diffusive material content ratios, creating a systematic approach to controlling luminance uniformity. This segmentation provides a structured solution that manages complexity through functional division.
Solution Approach 2:
The light emission device uses composite light diffusing members with different material compositions (different light-diffusive material content ratios). This composite approach allows optimization of luminance uniformity by combining materials with different properties in a coordinated manner.
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 effectively suppresses uneven luminance and allows for a thinner, more compact light emission device, suitable for applications such as smartphone backlights, by optimizing light diffusion and reflection across the device.
Implementation Method 1
a first light diffusing member having a plurality of throughholes and containing a light-diffusive material, each of the plurality of light-emitting elements being disposed in a corresponding one of the plurality of throughholes; a plurality of second light diffusing members covering the plurality of light-emitting elements and being disposed in the plurality of throughholes, each second light diffusing member containing a light-diffusive material
Implementation Method 2
a wavelength converting member disposed on the first light diffusing member and the plurality of second light diffusing members
Data Source
AI summary
A light emission device includes: a wiring board; a plurality of light-emitting elements being disposed on the wiring board and electrically connected to a wiring layer of the wiring board; a first light diffusing member being disposed on the wiring board, the first light diffusing member having a plurality of throughholes and containing a light-diffusive material, each of the plurality of light-emitting elements being disposed in a corresponding one of the plurality of throughholes; a plurality of second light diffusing members covering the plurality of light-emitting elements and being disposed in the plurality of throughholes, each second light diffusing member containing a light-diffusive material, such that a content ratio of the light-diffusive material in each second light diffusing member is higher than a content ratio of the light-diffusive material in the first light diffusing member; and a wavelength converting member.