Backlight Module Light Source Assembly Uniform Illumination
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Solution Overview
Problem
Direct type backlight modules for liquid crystal displays face challenges in achieving uniform light distribution and efficient light utilization due to the placement of light sources under the entire area of the panel, leading to potential hotspots and reduced image quality.
Innovation Solution
The implementation of a light source assembly with a base plate, encapsulation structure comprising first and second reflection members, and a diffusion plate, where the first reflection member has protrusions with inclined reflection surfaces and the second reflection member has conic curved surfaces to distribute light evenly across the light guide assembly, ensuring uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are disposed under the entire area of the liquid crystal display panel, then sufficient light is provided to the panel, but hotspots occur and light distribution becomes non-uniform
Solution Approach 1:
The light source assembly is segmented into multiple light-emitting units arranged in an array, with each unit independently controllable. This segmentation allows precise control over light distribution patterns, enabling uniform illumination across the display panel while avoiding concentrated hotspots by distributing light emission across multiple discrete sources.
Solution Approach 2:
Each light-emitting unit in the array has locally optimized optical characteristics, including tailored reflection surfaces and diffusion elements specific to its position in the array. This local quality adjustment ensures that each unit contributes appropriately to the overall uniform light distribution, compensating for positional variations and preventing hotspot formation.
2Area of stationary object
If multiple light sources are used to cover the entire panel area, then light coverage is improved, but device complexity increases
Solution Approach 1:
The light source assembly employs a universal modular design where identical light-emitting units are repeated across the array. Each module performs the same function of emitting and directing light, but their collective arrangement provides comprehensive coverage. This universality simplifies manufacturing and assembly while achieving extensive light coverage across the entire display panel area.
3Use of energy by moving object
If light sources are placed under the panel, then direct illumination is achieved, but light utilization efficiency decreases
Solution Approach 1:
The light source assembly incorporates curved reflection surfaces and dome-shaped diffusion elements that redirect light from the LED sources. These curved optical elements efficiently bounce and scatter light in multiple directions, ensuring that light emitted downward from the panel also reflects upward and forward, significantly improving overall light utilization efficiency and illumination effectiveness.
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 enhances light distribution and utilization, reducing hotspots and improving image quality by evenly dispersing light through the light guide assembly, allowing for independent control of light sources for uniform illumination.
Implementation Method 1
the first reflection member has protrusions with inclined reflection surfaces
Implementation Method 2
the second reflection member has conic curved surfaces to distribute light evenly
Implementation Method 3
a diffusion plate, where the first reflection member has protrusions with inclined reflection surfaces and the second reflection member has conic curved surfaces to distribute light evenly
Data Source
AI summary
A light source assembly includes a base plate, a light source secured on the base plate, a first reflection member, a second reflection member, and a diffusion plate. The first reflection member includes a base portion secured on the base plate and a plurality of protrusions with reflection surfaces inclined to the base plate. A through hole is defined on the base portion to receive the light source. Each protrusion protrudes from a side of the base portion away from the base plate and extends around the through hole. The second reflection member includes a reflection portion defining a plurality of light holes. The diffusion plate covers the second reflection member. Light emitting from the light source transmits to the light guide assembly via the reflection portion and the reflection surfaces.