Flexible Printed Circuit Board Housing for Slim LCD Modules
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving further compactness due to the increased total thickness caused by the expansion of folded flexible printed circuit boards, which becomes problematic when a shorter circuit is required.
Innovation Solution
A liquid crystal display device design that incorporates a flexible printed circuit board with a folding back portion fixed to the rear surface of the back case of the light unit, utilizing a housing portion at the bottom of the back case to house the folding back portion, and an end portion led out to the outside, allowing for adjustment and absorption of expansion without significantly increasing module thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the flexible printed circuit board is folded multiple times to achieve compactness, then the length of the circuit board is reduced, but the total thickness of the module increases
Solution Approach 1:
The folding back portion of the flexible printed circuit board is nested within a housing portion formed in the back case of the light unit. This allows the folded circuit board to be accommodated inside the existing structure without adding external thickness, effectively hiding the folded portion within the housing portion's cavity while maintaining module compactness.
Solution Approach 2:
Instead of folding the circuit board in a way that increases thickness (vertical dimension), the housing portion directs the folded circuit board along the longitudinal axis (horizontal dimension). The folding back portion extends in the longitudinal direction within the housing portion, converting a thickness problem into a length accommodation solution that doesn't increase module thickness.
2Volume of moving object
If the flexible printed circuit board is made shorter to improve compactness, then the module size is reduced, but the adaptability to different equipment specifications is reduced
Solution Approach 1:
The flexible printed circuit board incorporates a folding back portion that can be adjusted in its folded configuration. The circuit board can be folded different numbers of times or to different extents depending on the required length, allowing the same basic structure to adapt to various equipment specifications while maintaining compact module size.
Solution Approach 2:
The design allows changing the effective length of the flexible printed circuit board by adjusting how it is folded and positioned within the housing portion. This parameter adjustment enables the same module structure to accommodate different circuit board lengths required by different equipment specifications without compromising compactness.
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer between a pair of substrates, a light unit arranged in overlapping with the liquid crystal display panel for illuminating the liquid crystal display panel, the light unit including a front case and a back case for housing a light member, and a flexible printed circuit board. The flexible printed circuit board has a folding back portion which is housed at the housing portion provided at the bottom of the case of the backlight unit to adjust its length. The printed circuit board is drawn out from the housing portion to outside and connected to the outer circuits. Accordingly, it is possible to provide a compact and slim type liquid crystal display device.