Backlight Circuit Board Asymmetry for Odd-Number LED Arrangement
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Solution Overview
Problem
Existing light emitting devices with LED elements in backlight modules face limitations in manufacturing cost due to the need for even numbers of circuit boards and over-concentration of colors, affecting display quality.
Innovation Solution
The implementation of a circuit board design with two undetermined power input ends, allowing for flexible power input selection and arrangement of LED packages, which reduces the constraint on even numbers of circuit boards and minimizes color over-concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power lines are disposed at the same side of the edge type backlight module for convenience of assembly and operation, then ease of operation is improved, but the number of circuit boards must be even which increases manufacturing cost
Solution Approach 1:
The circuit board design uses asymmetric power input end configurations where one power input end has a different number of power input pads than the other power input end. This asymmetry allows circuit boards to be arranged in odd numbers while maintaining proper power distribution, eliminating the constraint that required even numbers of circuit boards and reducing manufacturing costs.
Solution Approach 2:
The circuit board is designed with universal power input capabilities at both ends, allowing the light emitting device to be flexibly configured in different arrangements (odd or even numbers of circuit boards) while maintaining the same power input convenience. This multi-functionality resolves the conflict between operational convenience and manufacturing cost.
2Ease of manufacture
If LED elements with three color chips are arranged in the same order on circuit boards, then manufacturing simplicity is improved, but color over-concentration occurs affecting display quality
Solution Approach 1:
The invention implements different chip arrangement patterns on different circuit boards within the same light emitting device. Specifically, adjacent circuit boards use different arrangement sequences for the red, green, and blue LED chips. This local variation in chip arrangement prevents color over-concentration in any particular direction while maintaining standardized manufacturing processes.
3Device complexity
If the number of circuit boards is limited to even numbers to maintain power line symmetry, then circuit board design simplicity is improved, but application flexibility is reduced
Solution Approach 1:
By designing power input ends with asymmetric pad configurations, the invention enables circuit boards to be used in odd numbers while maintaining proper electrical connections. This asymmetric design provides application flexibility for different display sizes and configurations without significantly increasing circuit board design complexity.
Data Source
AI summary
A manufacture method of a light emitting device is provided. Firstly, at least one circuit board is provided. A plurality of light emitting packages, a first undetermined power input end and a second undetermined power input end are disposed at the circuit board. The light emitting packages are electrically connected to the first undetermined power input end and the second undetermined power input end. Each of the first undetermined power input end and the second undetermined power input end has at least two first pads. The first pads of each of the first undetermined power input end and the second undetermined power input end are electrically isolated from each other. Next, the first undetermined power input end is selected to be a power input region for inputting an external power signal. Then, the first pads of the second undetermined power input end are electrically connected to each other.