Light Diffusion Plate with Triangular Pyramid Structures
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Solution Overview
Problem
Existing direct type backlight modules suffer from strong light spots due to air pockets between components, reduced brightness due to light absorption and total reflection, and compromised mechanical strength from sectioned integration, leading to reliability issues.
Innovation Solution
A light diffusion plate with a main body featuring a flat first surface and a second surface with rectangular structures defining four adjacent triangular pyramid depressions, which form V-shaped ridges that enhance light diffusion and concentration, eliminating the need for additional diffusion films and prism sheets, and are manufactured integrally for increased rigidity and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If additional upper light diffusion film and prism sheet are added to reduce light spots, then light spot uniformity is improved, but light loss increases due to total reflection at air pockets and absorption by diffusion film
Solution Approach 1:
The patent combines the light diffusion function and light spot uniformity control function into a single integrated light diffusion plate, eliminating the need for separate upper light diffusion film and prism sheet components. This merging removes the air pockets between components that cause total reflection and light loss, while still achieving uniform light distribution through the specially designed rectangular and triangular structures on the plate's surface.
Solution Approach 2:
The patent extracts and eliminates the problematic air pockets and additional components (upper light diffusion film and prism sheet) from the optical path. By integrating all necessary functions into the main light diffusion plate, the design removes the interfaces where total reflection occurs, thereby reducing light loss while maintaining the desired light uniformity.
2Measurement precision
If multiple separate components are used for light diffusion and concentration, then light control precision is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple optical functions (light diffusion, light concentration, and light spot uniformity control) into a single light diffusion plate component. The plate features both rectangular structures for diffusion and triangular structures for light concentration, integrating what would traditionally require separate diffusion films and prism sheets, thereby simplifying the overall device while maintaining precise light control.
Solution Approach 2:
The light diffusion plate is designed with multi-functionality, serving as both a diffusion element and a light concentration element simultaneously. The rectangular structures provide diffusion while the triangular structures provide concentration, allowing one component to perform multiple optical functions that would otherwise require separate specialized components.
3Ease of manufacture
If sectioned integration is used for manufacturing backlight module, then manufacturing flexibility is improved, but mechanical strength and rigidity deteriorate
Solution Approach 1:
The patent integrates the light diffusion plate as a single unified component that can be manufactured as one piece, improving mechanical strength and rigidity compared to assembled multi-component designs. The integration of multiple optical functions into one component eliminates the need for multiple separate parts that would require assembly, thereby strengthening the overall structure while maintaining manufacturing flexibility through the unified design.
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 achieves uniform light distribution, enhanced brightness, and improved mechanical reliability by reducing strong light spots and eliminating the need for additional components, while ensuring efficient light utilization and robust module construction.
Implementation Method 1
The light diffusion plate includes a plurality of diffusion particles (not shown) configured for diffusing light. Light from the point light sources 12 enters the diffusion plate 13 and becomes scattered.
Implementation Method 2
The scattered light then travels through the prism sheet 10 and is refracted out at the elongated V-shaped ridges 105 of the prism sheet 10. The refracted light leaving the prism sheet 10 is concentrated at the prism layer 103 and increases the brightness (illumination) of the prism sheet 10.
Implementation Method 3
When the backlight module 100 is in use, light passes through the air pockets, and some of the light undergoes total reflection by the air pockets along one or another of the corresponding boundaries.
Data Source
AI summary
An exemplary light diffusion plate includes a main body, and a plurality of diffusion particles dispersed in the main body. The main body includes a first surface and a second surface. The first surface and the second surface are on opposite sides of the main body. The first surface is a flat surface. The second surface defines a plurality of rectangular structures. Each rectangular structure defines four adjacent triangular pyramid depressions. A backlight module using the light diffusion plate is also provided.