Composite Diffuser Structure for Backlight Module View Angle
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Solution Overview
Problem
Existing backlight systems suffer from restricted view angles due to over-focusing of light, resulting in inadequate front brightness and limited viewing convenience for users.
Innovation Solution
A composite diffuser structure comprising a transparent layer with a lenticular structure and reflection structures on its surface, where the lenticular lenses have a specific width and openings between adjacent reflection structures, allowing for adjustable light diffusivity and increased view angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a prism is used to focus the light beam and increase front brightness, then the brightness is improved, but the view angle is restricted
Solution Approach 1:
The diffuser is divided into multiple functional regions: a first region with a prism structure for focusing light to increase front brightness, and a second region with a flat plate structure for maintaining wider view angles. This segmentation allows different parts of the diffuser to perform different functions, resolving the contradiction between front brightness and view angle.
Solution Approach 2:
Different regions of the diffuser are given different optical properties: the first region has a prism structure with specific refraction angles optimized for front brightness, while the second region has a flat plate structure optimized for view angle. This local differentiation of structure and function resolves the contradiction by allowing each region to optimize for its specific purpose.
2Productivity
If the light beam is over-focused to increase front brightness, then the brightness efficiency is improved, but the view angle becomes too narrow
Solution Approach 1:
The diffuser is segmented into a first region with prism structure for high light efficiency and front brightness, and a second region with flat plate structure for wider view angle coverage. This segmentation allows the system to achieve both high light efficiency in the front direction and adequate view angle across different viewing positions.
Solution Approach 2:
The invention transitions from a single uniform diffuser structure to a multi-region structure with different optical characteristics. By adding the dimensional aspect of spatial distribution of different structures, the system can simultaneously achieve high light efficiency in certain directions and wide view angles in other directions.
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 enhances light efficiency and front brightness while expanding the view angle of the display screen, providing improved illumination and convenience.
Implementation Method 1
the incident light L2a is refracted by the lenticular structure 11a to generate a projection light that is upward
Implementation Method 2
the incident light L1a is directly reflected by the rectangular reflection structures 12a that protrude downwards and is returned back to the light source
Data Source
AI summary
A composite diffuser structure includes a transparent layer having a light-entering surface and a light-emitting surface, a lenticular structure having a plurality of lenticular lens formed on the light-emitting surface, and a plurality of refection structures located on the light-entering surface. Each of the lenticular lenses has a first width. There is an opening between two adjacent reflection structures. Each of the openings has a second width. Thereby, the light beam enters into the transparent layer via the opening to increase the light efficiency. By using the diffuser layer located above the lenticular structure, the view angle can be adjusted.