Optical Microstructures on Circuit Board for Backlight Uniformity
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Solution Overview
Problem
Conventional direct-type backlight modules suffer from non-uniform light distribution on the circuit board, leading to illumination uniformity issues and bright/dark bands in liquid-crystal displays.
Innovation Solution
The implementation of optical microstructures on the circuit board, specifically in regions where light emitted from the light-emitting element forms bright bands, using a screen printing method with light-absorbing or light-reflecting materials to absorb or guide light, thereby improving illumination uniformity without the need for additional optics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional direct-type backlight modules are used without optical microstructures, then the structure is simple and production cost is low, but the light distribution on the circuit board is non-uniform causing bright/dark bands
Solution Approach 1:
The patent applies local quality by creating optical microstructures (such as microlenses or reflective patterns) at specific locations on the circuit board where light density is predicted to be higher. These localized structures modify light distribution only in the regions where it is needed, rather than requiring a complete redesign of the entire backlight system. This allows improvement of illumination uniformity while maintaining overall structural simplicity.
Solution Approach 2:
The patent introduces optical microstructures that operate in the optical dimension (light manipulation) rather than modifying the mechanical or electrical dimensions of the backlight module. By adding micro-scale optical features to the circuit board surface, the patent addresses light distribution issues without increasing the macro-scale structural complexity of the assembly.
2Illumination intensity
If additional optics are used to improve light distribution uniformity, then illumination uniformity improves, but production cost increases
Solution Approach 1:
The patent merges the optical function with the existing circuit board structure by integrating optical microstructures directly into the board. Instead of adding separate optical components (such as diffusers or reflectors as distinct parts), the optical functionality is combined with the circuit board itself, eliminating the need for additional components and reducing production costs while achieving improved light distribution.
Solution Approach 2:
The circuit board serves dual functions: its original electrical function and a new optical function through the integrated microstructures. The circuit board with optical microstructures automatically manages light distribution in the regions where LEDs are disposed, eliminating the need for separate optical management components and reducing overall system 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
This solution enhances illumination uniformity by strategically placing optical microstructures to manage light distribution, reducing production costs and eliminating bright/dark bands in liquid-crystal displays.
Implementation Method 1
a portion of light emitted from the light-emitting element can be absorbed or guided by the optical microstructures
Implementation Method 2
a portion of light emitted from the light-emitting element can be absorbed or guided by the optical microstructures
Data Source
AI summary
A light-emitting assembly and a method for manufacturing the same are provided. The light-emitting assembly includes a circuit board with a light-emitting element and a plurality of optical microstructures disposed thereon. The optical microstructures adjacent to the light-emitting element absorb or guide a portion of light emitted from the light-emitting element.