Optical Diffusion Plate with Reflection Layer for Uniform Illumination
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Solution Overview
Problem
Conventional direct type backlight modules face challenges in providing uniform lighting as the thickness of display devices decreases, leading to increased manufacturing costs and reduced yield due to higher density of light sources and optical lenses.
Innovation Solution
An optical diffusion plate with a reflection layer covering specific pattern regions on its surfaces, which diffuses light beams to achieve uniform illumination, allowing for a reduced distance between the light source and the display panel while maintaining effective illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the display device is decreased, then the display device becomes thinner and more compact, but the distance between the light source and display panel decreases causing non-uniform lighting effect
Solution Approach 1:
The optical lens is divided into multiple independent light guiding structures with different shapes and light guiding directions. Each structure segments the light beam from different regions of the light source, redirecting them to different areas of the display panel to achieve uniform illumination despite the reduced distance
Solution Approach 2:
Different regions of the optical lens have different light guiding directions and structures. The optical lens includes light guiding structures with different shapes positioned at different locations, allowing each region to optimize light distribution locally while contributing to overall uniform illumination
2Length of stationary object
If the thickness of the display device is further decreased, then the display device becomes even thinner, but the distribution density of light source and optical lens increases causing decreased manufacturing yield and increased cost
Solution Approach 1:
The optical lens and diffuser are merged into a single integrated optical sheet. This integration eliminates the need for separate components, reducing the number of parts that need to be assembled and positioned precisely, thereby improving manufacturing yield and reducing costs while maintaining the thin profile
3Area of stationary object
If conventional optical lens is used to adjust light beam, then light beam can illuminate larger region, but the density of light source and optical lens increases causing increased manufacturing cost
Solution Approach 1:
The optical lens performs multiple functions simultaneously: it guides light from different regions, redirects light beams to different areas, and works with the diffuser to achieve uniform illumination. This multi-functionality eliminates the need for additional separate optical components, reducing manufacturing complexity and cost
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 provides uniform illumination even at reduced thickness, decreasing manufacturing costs and increasing yield by optimizing light distribution and reflection rates across the optical diffusion plate.
Implementation Method 1
The optical diffusion plate of the embodiments of the invention has the reflection layer covering the pattern region of the light incident surface or the light emitting surface. Thus, the light beam transmitted from outside to the pattern region may be reflected by the reflection layer
Implementation Method 2
The optical diffusion plate diffuses light beam from light source so as to provide uniform illumination light
Data Source
AI summary
An optical diffusion plate and a light source module are provided. The optical diffusion plate includes a light incident surface, a light emitting surface, at least one pattern region, and a reflection layer. The pattern region is located on at least one of the light incident surface and the light emitting surface. The reflection layer covers a portion of the pattern region. The pattern region includes a central region located at a central position, a plurality of first circular regions, and at least one second circular region. The central region is surrounded by the first circular regions and the second circular region alternatively, and perimeter of the central region is adjacent to one of the first circular regions. Coverage rates of the reflection layer at the second circular region and the central region are higher than coverage rates of the reflection layer at the first circular regions.