Light Emitting Device Protrusions Reduce Color Unevenness
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Solution Overview
Problem
Existing light emitting devices face issues with color unevenness and luminance unevenness in emitted light, which affect their performance and application in thin-type backlight devices and lighting fixtures.
Innovation Solution
A light emitting device design that includes a plurality of light emitting elements, light-transmissive members, a covering member, and protrusions, where the light-transmissive members are bonded using a light-guiding adhesive member and the covering member is in contact with the lateral surfaces of the light-transmissive members, reducing contact with external components and enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If light emitting devices are made thin for backlight devices and lighting fixtures, then device thickness is reduced, but color unevenness and luminance unevenness in emitted light increase
Solution Approach 1:
The patent applies local quality by creating protrusions at specific locations on the light-transmissive member that are spaced apart from light-transmissive members. These localized structural modifications target specific areas to control light extraction and distribution, thereby improving color and luminance uniformity without increasing overall device thickness. The protrusions are strategically positioned to address local light distribution issues in thin-type devices.
2Reliability
If the covering member contacts lateral surfaces of light-transmissive members, then protection from external components is improved, but device complexity increases
Solution Approach 1:
The patent merges the covering member with the light-transmissive member by integrating the protrusions directly into the light-transmissive member structure. This combination allows the covering member to contact and protect the lateral surfaces of light-transmissive members while avoiding the need for separate protective structures, thereby reducing overall device complexity while maintaining reliability.
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 reduces color and luminance unevenness, enabling a thin, narrow-frame light emitting device with improved light distribution properties and reduced risk of damage from external components.
Implementation Method 1
The light-guiding adhesive member bonds the light emitting element and the light-transmissive member
Implementation Method 2
the light-guiding adhesive member including a base material and organic particles dispersed in the base material
Data Source
AI summary
A light emitting device includes light emitting elements, light-transmissive members, a covering member, at least one first protrusion, and two second protrusions. The light emitting elements are aligned in a first direction. The light-transmissive members are respectively disposed on upper surfaces of the light emitting elements. The covering member includes at least one first covering portion and two second covering portions. The at least one first covering portion is arranged between adjacent ones of the light-transmissive members, and the second covering portions are arranged at distal ends of the light emitting device in the first direction with the light-transmissive members being arranged between the second covering portions. The at least one first protrusion is arranged on an upper surface of the at least one first covering portion and being spaced apart from the light-transmissive members. The second protrusions respectively arranged on upper surfaces of the second covering portions.