Trapezoid Lens Diffusion Plate for Backlight Uniformity
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Solution Overview
Problem
Conventional direct-type backlight modules, especially for large screen LCD displays, face challenges in achieving high brightness and uniform light distribution due to limitations in the number and positioning of lamps and light diffusion components, leading to high costs associated with prism sheets.
Innovation Solution
A high-brightness diffusion plate with a trapezoid microstructure is introduced, replacing conventional prism sheets, featuring trapezoid lenses that focus light energy beyond 45 degrees and incorporating diffusion particles for enhanced uniformity, manufactured through an extrusion process, reducing the need for additional diffuser sheets and prism sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional prism sheets are used to enhance brightness and uniformity, then light output quality is improved, but production cost increases significantly
Solution Approach 1:
The patent combines the functions of the diffusion plate and prism sheet into a single integrated component. The diffusion plate is equipped with trapezoid lens arrays directly on its light-exiting surface, merging the light diffusion function of the plate with the light focusing function of the prism sheet, thereby eliminating the need for separate prism sheets and reducing production costs
Solution Approach 2:
The diffusion plate is designed to perform multiple functions simultaneously: it diffuses light uniformly across the display surface while the integrated trapezoid lens arrays focus light energy to enhance brightness. This multi-functional design replaces what previously required separate components, reducing overall system cost
2Stability of the object's composition
If multiple diffuser sheets and prism sheets are used to achieve uniform light distribution, then light uniformity is improved, but device complexity increases
Solution Approach 1:
The patent integrates the trapezoid lens arrays directly onto the diffusion plate, combining what were previously separate components (diffusion plate + prism sheet) into a single unit. This reduces the total number of components in the backlight module while maintaining light uniformity through the coordinated action of the diffusion plate material and the integrated lens structure
3Illumination intensity
If the number of lamps is increased to provide high brightness for large screens, then illumination intensity is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies trapezoid lens arrays at specific locations on the diffusion plate where light focusing is most needed. The lens arrays are positioned to capture and redirect light energy from the lamps, concentrating it in areas that require enhanced brightness. This localized optical enhancement allows for reduced lamp count while maintaining overall brightness levels
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 trapezoid diffusion plate enhances brightness and uniformity of light output, achieving similar effects to prism sheets while significantly reducing production costs and simplifying manufacturing, making it suitable for mass production without compromising performance.
Implementation Method 1
a plurality of trapezoid lens is disposed on surface of the diffusion plate so as to make the direct-type backlight module provide better output light with higher brightness and uniform diffusion
Implementation Method 2
the trapezoid lens, the direct-type backlight module provides better output light with higher brightness and uniform diffusion
Implementation Method 3
the diffusion plate is added with diffusion particles to make the light output more uniform
Data Source
AI summary
A high-brightness diffusion plate with trapezoid lens applied to a direct-type backlight module is disclosed. The high-brightness diffusion plate with trapezoid lens according to the present invention consists of a diffusion plate and a plurality of trapezoid lens disposed on at least one side of the diffusion plate for improving light efficiency and diffusion effect of the diffusion plate. By the diffusion plate with trapezoid lens, the direct-type backlight module provides better light output as well as more uniform brightness. Moreover, the diffusion plate of the present invention is used in combination with all or part of optical film. The optical film includes brightness enhancement film (BEF), an upper diffuser sheet and an lower diffuser sheet. The diffusion plate is made from plastic. By extrusion, the diffusion plate and the plurality of trapezoid lens are easily processed to form an integral. Therefore, the direct-type backlight module has better light output efficiency with lower cost.