LED Board Interlock Asymmetry for Chromaticity Uniformity
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Solution Overview
Problem
Existing liquid crystal display devices with backlight units using LEDs for illumination face issues of uneven color and brightness due to incorrect arrangement of light source devices, leading to inconsistent chromaticity and brightness across regions.
Innovation Solution
A lighting device configuration featuring a first and second board with interlock portions on a chassis, ensuring proper alignment by preventing the first board from being incorrectly placed in the second board's area, thereby maintaining uniform green chromaticity and brightness through predetermined orientations and notches on the LED boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light source devices are arranged according to different LED arrangement manners to suppress uneven color and brightness, then uniform chromaticity and brightness are achieved, but wrong arrangement of boards occurs leading to renewed unevenness
Solution Approach 1:
The patent applies asymmetry by providing different interlock portion configurations on the first board versus the second board. The first board has a first interlock portion with specific shape and position, while the second board has a second interlock portion with different shape and position. This asymmetric design ensures that each board can only be correctly installed in its designated area, preventing wrong arrangement while maintaining the required uniform chromaticity and brightness through proper LED placement patterns.
Solution Approach 2:
The patent uses interlock portions as intermediary elements between the boards and the housing. These interlock portions act as mediators that guide and constrain the boards into correct positions. The housing provides corresponding interlock portion receptacles that receive and secure the boards, ensuring reliable correct arrangement while allowing the LED patterns on the boards to maintain uniform chromaticity and brightness output.
2Ease of manufacture
If simple configuration is used for the lighting device, then ease of manufacture is improved, but prevention of wrong board arrangement becomes difficult
Solution Approach 1:
The patent implements a relatively simple configuration by using straightforward interlock portions with basic geometric shapes (such as rectangular protrusions and corresponding recesses). These simple asymmetric features are easy to manufacture using standard PCB and housing fabrication processes, while still effectively preventing wrong board arrangement through their non-matching geometries when placed in incorrect positions.
Data Source
AI summary
In a lighting device 12 according to the present invention, a first board 20a and a second board 20b on which a plurality of light sources 17 are mounted are arranged in a first board arrangement area 30a and a second board arrangement area 30b of a chassis 14, respectively, in respective predetermined orientations. The first board 20a includes a first board-side interlock portion 31a interlocked with a first chassis-side interlock portion 32a provided in the first board arrangement area 30a, and the second board 20b includes a second board-side interlock portion 31b interlocked with a second chassis-side interlock portion 32b provided in the second board arrangement area 30b. In arranging the first board 20a in the second board arrangement area 30b, the first board-side interlock portion 31a is not interlocked with the second chassis-side interlock portion 32b.