Optical Structure Film Beam Splitting Microstructures for Bright Point Suppression
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Solution Overview
Problem
Current direct-type backlight modules with mini light emitting diodes suffer from bright point defects due to the arrangement of point light sources, affecting visual effect and uniformity, and existing solutions like diffusion films, optical microstructures, and scattering particles either require high precision alignment or have limited diffusion capacity.
Innovation Solution
An optical structure film with microstructures featuring inwardly concave beam splitting surfaces and curved surfaces that disperse bright points into light spots, reducing brightness per unit area and allowing for closer arrangement of light emitting elements without alignment requirements, thereby reducing module thickness and improving visual uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a diffusion film with printed dots is used to shield bright points, then the bright point phenomenon is suppressed, but the requirements for mounting precision and assembly tolerance increase due to alignment requirements
Solution Approach 1:
The patent extracts the alignment requirement from the bright point suppression system by using a self-aligned optical microstructure pattern that is formed directly on the light emitting element array substrate. The microstructure pattern is defined by the substrate itself, eliminating the need for separate alignment processes between diffusion films and light emitting elements.
Solution Approach 2:
The patent introduces an optical microstructure pattern as an intermediary between the light emitting elements and the observer. This microstructure pattern acts as a mediator that converts point light sources into distributed light spots through optical diffraction and interference, naturally suppressing bright points without requiring mechanical alignment.
2Object-affected harmful factors
If a V-shaped groove structure or pyramid structure is used to split bright points, then the bright point is dispersed, but an obvious ghost image is formed affecting uniformity
Solution Approach 1:
The patent employs curved surface microstructures instead of sharp-edged geometric shapes like V-shaped grooves or pyramids. The curved surfaces create smoother optical transitions and more uniform light distribution patterns, eliminating the distinct ghost images that arise from sharp geometric edges while still achieving bright point suppression through optical interference.
Solution Approach 2:
The patent uses different microstructure patterns in different regions of the optical film to optimize local optical properties. The microstructure design creates localized optical interference patterns that suppress bright points at specific locations while maintaining overall visual uniformity across the display area.
3Object-affected harmful factors
If scattering particles are added to an optical film to suppress bright points, then random light ray scattering is achieved, but the diffusion capacity cannot be effectively improved when particle concentration reaches a certain level
Solution Approach 1:
The patent replaces the mechanical scattering mechanism of particles with an optical interference mechanism. Instead of relying on random particle scattering, the patent uses a controlled optical microstructure pattern that creates deterministic interference patterns, achieving both bright point suppression and effective light diffusion through optical rather than mechanical means.
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 optical structure film effectively suppresses bright point phenomena, enhancing visual uniformity and reducing the number of light emitting elements needed, which lowers costs and improves the light source module's thickness and visual effect.
Implementation Method 1
Each of the optical unit microstructures has four side surfaces and an inwardly concave beam splitting surface. The beam splitting surface is respectively connected to the four side surfaces and the beam splitting surface has four endpoints when viewed from a front viewing angle.
Implementation Method 2
The third solution is to add scattering particles into an optical film, and use randomly scattered light rays after the light rays are irradiated on the scattering particles to achieve the effect of suppressing the bright point phenomenon.
Data Source
AI summary
An optical structure film and a light source module are provided. The optical structure film includes multiple optical unit microstructures. Each of the optical unit microstructures has four side surfaces and an inwardly concave beam splitting surface. The beam splitting surface is respectively connected to the side surfaces, and the beam splitting surface has four endpoints when viewed from a front viewing angle. Connection lines of the four endpoints form a rectangle. The beam splitting surface includes at least one beam splitting curved surface. A junction of the at least one beam splitting curved surface and one of the four side surfaces is a first line segment. A projection of a midpoint of an edge of the rectangle on the beam splitting surface overlaps with a relative extreme point of the first line segment.