LED Package Light-Blocking Structure for Uniform Wide-Angle Backlights
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing LED devices in backlight modules fail to achieve wide-angle and uniform illumination, leading to increased cost and inability to meet the requirements of thin, light-weight, and low energy consumption.
Innovation Solution
A light-emitting device comprising lead electrodes, a transparent molding, a light-emitting element, a resin layer, and a light-blocking layer, with specific configurations to achieve a bimodal angular intensity profile for uniform illumination, and a transparent LED frame with a concave surface and diffusion agent to enhance light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If more LEDs or films are provided to improve optical performance, then brightness uniformity is improved, but cost increases and the module becomes thicker and heavier
Solution Approach 1:
The patent applies local quality by creating a bimodal angular intensity profile with specific bright and dark regions through the LED lens structure. The lens is designed with asymmetric light distribution characteristics, where light is intentionally concentrated in certain angular zones while other zones remain darker. This localized light distribution approach achieves uniform overall illumination without requiring additional optical films or more LEDs, thereby reducing cost and structural complexity while maintaining brightness uniformity.
2Illumination intensity
If more LEDs or films are provided to improve optical performance, then brightness uniformity is improved, but the module thickness and weight increase
Solution Approach 1:
The patent achieves brightness uniformity through the bimodal angular intensity profile created by the LED lens structure, eliminating the need for additional optical films that would increase weight. The asymmetric light distribution design concentrates light in specific angular zones, achieving uniform overall illumination without adding extra layers or components, thus maintaining a lightweight module construction.
3Illumination intensity
If more LEDs or films are provided to improve optical performance, then brightness uniformity is improved, but energy consumption increases
Solution Approach 1:
The patent achieves uniform brightness distribution through the bimodal angular intensity profile generated by the LED lens structure, eliminating the need for additional optical films that would increase energy consumption. The asymmetric light distribution design efficiently directs light to where it is needed, achieving uniform overall illumination without requiring extra LEDs or energy-intensive optical components, thus reducing total energy consumption.
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 enables wide-angle and uniform illumination, reduces the number of LED devices needed, lowers the cost of the backlight module, and achieves a thinner, lighter design while maintaining optical performance.
Implementation Method 1
the resin layer includes a fluorescent material to absorb a first light emitted by the light-emitting element and then emit a second light
Implementation Method 2
a light emitted by the light-emitting element is transmitted through a side wall of the transparent molding
Implementation Method 3
The light-blocking layer is disposed on the resin layer, and an upper surface of the light-blocking layer is coplanar with an upper surface of the transparent molding. The light-blocking layer covers 60%-95% of an area of an upper surface of the resin layer.
Data Source
AI summary
A light-emitting device includes at least two lead electrodes, a transparent molding, a light-emitting element, a resin layer, and a light-blocking layer. The lead electrodes are disposed opposite to each other. The transparent molding is positioned between the lead electrodes and around edges of the lead electrodes to form a recess. The light-emitting element is disposed in the recess of the transparent molding. The resin layer is formed in the recess of the transparent molding and covering the light-emitting element. The light-blocking layer is disposed on the resin layer, and an upper surface of the light-blocking layer is coplanar with an upper surface of the transparent molding. The light-blocking layer covers 60%-95% of an area of an upper surface of the resin layer.