Hexagonal Light Guiding Strip for Thin Backlight Modules
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Solution Overview
Problem
Conventional light guiding strips and backlight modules are either thick and heavy or have high costs due to the need for additional components like light guides and circuit boards, and they do not efficiently utilize LED placement.
Innovation Solution
A light guiding strip with a hexagonal or octagonal cross-section featuring light reflecting and emergent surfaces with diffusion patterns, allowing for both side-lit and direct-lit characteristics, eliminating the need for a light guide and enabling increased LED pitch and reduced thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide is used in side-lit backlight module to achieve uniform light distribution, then light uniformity is improved, but weight and device complexity increase
Solution Approach 1:
The patent removes the separate light guide component from the backlight module structure. Instead of using a dedicated light guide to distribute light uniformly, the invention integrates light diffusion functionality directly into the LED packaging structure through the transparent encapsulant and reflective cup design, thereby eliminating unnecessary components and reducing weight while maintaining light uniformity
Solution Approach 2:
The patent combines multiple functions into the LED package structure itself. The transparent encapsulant serves both as a protective seal and as a light diffusion medium, while the reflective cup integrates light reflection and directional control functions. This merging of functions eliminates the need for separate light guide components, reducing device complexity and weight
2Quantity of substance
If LEDs are arranged densely in direct-lit backlight module to reduce pitch, then LED density is improved, but light mixing distance increases causing thicker structure
Solution Approach 1:
The patent applies local quality enhancement by incorporating a reflective cup structure around each LED. This reflective cup concentrates and redirects light in specific directions, improving light mixing efficiency in the immediate local area around each LED. This allows for effective light distribution even with increased LED pitch, maintaining uniformity without requiring a thick light mixing distance
Solution Approach 2:
The patent introduces a vertical dimension element through the reflective cup structure that redirects light horizontally across the display area. By bouncing light off the reflective cup surfaces, the light travels laterally across multiple LED zones, effectively increasing the light mixing path length without increasing the vertical thickness of the backlight module
3Adaptability or versatility
If additional circuit board is added to direct-lit backlight module to control LEDs, then control functionality is improved, but device complexity and cost increase
Solution Approach 1:
The patent removes the separate circuit board from the backlight module structure. LED control functionality is integrated directly into the PCB that already exists in the display device. The PCB traces and existing LED mounting structure provide sufficient control capability without requiring an additional dedicated circuit board, thereby reducing device 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
The solution results in a lightweight, cost-effective backlight module with improved light uniformity and efficiency, reducing the thickness and weight of the display while maintaining high LED density without the need for additional circuit boards.
Implementation Method 1
a plurality of light reflecting surfaces, and a plurality of light emergent surfaces, in which each of the light reflecting surfaces has a light diffusion pattern
Implementation Method 2
each of the light reflecting surfaces has a light diffusion pattern
Implementation Method 3
the light emitted by the LEDs is concentratedly irradiated out from an arced surface of the light guiding strip
Data Source
AI summary
A light guiding strip and a backlight module and display using the same are provided. The light guiding strip of the present invention includes a plurality of light reflecting surfaces and a plurality of light emergent surfaces. Each of the light reflecting surfaces has a light diffusion pattern. The light guiding strip of the present invention has the advantages of light weight, wide LED pitch, low cost, thickness and so on.