Light-Emitting Device Reflector Assembly for Tape-Free Extraction
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Solution Overview
Problem
Existing backlight modules in electronic devices face issues with tape adjacent to light-emitting elements affecting extraction efficiency, which has not been adequately addressed in current designs.
Innovation Solution
A backlight module design featuring a specific configuration of first and second reflective elements with controlled reflectivity ratios, positioned to enhance light extraction efficiency by optimizing the arrangement and reflectivity of these elements relative to light-emitting elements and the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If tape is disposed adjacent to light-emitting elements for structural support and positioning, then device assembly is simplified, but extraction efficiency of the backlight module deteriorates due to light blocking
Solution Approach 1:
The patent removes the tape component from the backlight module design. Instead of using tape to position and support the light-emitting elements, the invention uses a reflective plate with specifically designed reflective regions that eliminate the need for tape while maintaining proper element positioning and improving light extraction efficiency by removing the light-blocking tape material.
Solution Approach 2:
The reflective plate incorporates a light-emitting element region with aperture structures that allow light to pass through while maintaining the reflective functionality. This porous-like structure enables light extraction while supporting the light-emitting elements without requiring additional tape materials that would block light.
2Illumination intensity
If uniform light distribution is achieved through optimized reflective element arrangement, then display quality improves, but device complexity increases due to precise positioning requirements
Solution Approach 1:
The reflective plate is designed with different reflective characteristics in different regions: a first reflective region with specific reflectivity for general light reflection, and a second reflective region with different reflectivity for targeted light control. This local differentiation achieves uniform light distribution while using a single integrated structure rather than multiple complex components.
Solution Approach 2:
The reflective plate functions as a composite optical structure combining different reflective properties in one element. By integrating multiple functional regions with different reflectivities into a single plate, the design achieves complex light distribution control without assembling multiple separate components, thereby reducing overall structural 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
Improves the extraction efficiency of the backlight module, enhancing the performance and reliability of electronic devices by ensuring uniform light distribution and reducing color shifting or bright/dark bands.
Implementation Method 1
a first reflective element disposed on the circuit board, and a second reflective element disposed on the first reflective element
Implementation Method 2
a plurality of light-emitting elements arranged on the circuit board
Data Source
AI summary
A light-emitting device includes a circuit board having a light-reflecting region, light-emitting elements arranged on the circuit board, a first reflective element disposed on the circuit board, and a second reflective element disposed on the first reflective element and including apertures overlap the circuit board along a normal direction of the circuit board. The first reflective element is disposed between the second reflective element and the circuit board. The light-emitting elements are disposed in the apertures. At least a part of the first reflective element is located in at least one of the apertures when viewed from the normal direction. The first reflective element and the second reflective element respectively overlap at least part of the light-reflecting region along the normal direction. The first reflective element partially overlaps the second reflective element along the normal direction.