Light-Emitting Module With Inclined Bonding Member
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Solution Overview
Problem
Light-emitting devices with high directivity often result in uneven luminance due to variations in light emission from different portions of the light-emitting elements, leading to inconsistent display quality in liquid-crystal display devices.
Innovation Solution
A light-emitting module design featuring a light-emitting element unit with a light-transmissive member covering the main light-emitting surface and a first light-reflective member covering the lateral surfaces, combined with a light-guiding plate and a light-transmissive bonding member forming an acute angle with the reflective member, which controls radiation characteristics to reduce luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If light-emitting elements are used with high directivity, then light emission efficiency is improved, but luminance uniformity deteriorates
Solution Approach 1:
The patent applies local quality by creating different surface characteristics in different regions of the light-transmissive member. The inclined surfaces are formed only in specific regions where light extraction enhancement is needed, while other regions maintain their original characteristics. This allows localized modification of light emission properties to achieve overall luminance uniformity without compromising total light output efficiency.
Solution Approach 2:
The patent introduces a new dimensional aspect by forming inclined surfaces at specific angles (e.g., 45 degrees) relative to the light emission direction. This angular dimension modifies the light extraction path and distribution, transforming the unidirectional high-directivity emission into a more uniformly distributed emission pattern across multiple angles, thereby resolving the luminance uniformity issue while preserving efficiency.
2Illumination intensity
If light-transmissive member with inclined surfaces is used, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent segments the light-transmissive member into distinct regions: regions with inclined surfaces and regions without inclined surfaces. This segmentation allows the complex light redistribution function to be localized to specific areas, simplifying the overall device architecture while achieving luminance uniformity. The segmented approach avoids the need for completely redesigning the entire light-transmissive member structure.
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 luminance unevenness by guiding and reflecting light more uniformly, enhancing the light extraction efficiency and achieving more consistent emission across the display surface.
Implementation Method 1
a light-transmissive bonding member disposed in contact with inner lateral surfaces of the recess and outer lateral surfaces of the light-emitting element unit. At least a portion of the first light-reflective member is located outside the recess in a sectional view, and is in contact with the light-transmissive bonding member. The light-transmissive bonding member has an inclined surface forming an acute angle with a corresponding outer lateral surface of the first light-reflective member.
Data Source
AI summary
A light-emitting module includes a light-emitting element unit including a light-emitting element, a light-transmissive member covering a main light-emitting surface of the light-emitting element, and a first light-reflective member covering lateral surfaces of the light-emitting element; a light-transmissive light-guiding plate having a first main surface and a second main surface having a recess accommodating the light-emitting element unit; a second light-reflective member covering the second main surface and the light-emitting element unit; and a light-transmissive bonding member disposed in contact with inner lateral surfaces of the recess and outer lateral surfaces of the light-emitting element unit. At least a portion of the first light-reflective member is located outside the recess in a cross-sectional view, and is in contact with the light-transmissive bonding member. The light-transmissive bonding member has an inclined surface forming an acute angle with a corresponding outer lateral surface of the first light-reflective member.