LCD Device Circuit Board Nesting for Compact Width
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Solution Overview
Problem
Conventional liquid crystal display devices for entertainment machines face issues with increased cost and external dimensions due to the use of general-purpose flexible circuit boards and the need for custom components to prevent moire interference, which also complicates assembly and visibility.
Innovation Solution
A liquid crystal display device design that incorporates a conventional flexible circuit board with a tape carrier package, a supporting plate with specific fixing members, and a liquid crystal shutter with spacers to maintain distances and prevent moire, while using conventional components to reduce costs and maintain visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a general-purpose flexible circuit board is used to connect the liquid crystal panel to the circuit board, then the device can be manufactured with standard components, but the assembly increases in length and width, undesirably increasing the external dimensions of the outer frame
Solution Approach 1:
The patent repositions the circuit board from the bottom plate to the light guide plate, changing the spatial arrangement from a planar extension to a vertically stacked configuration. This dimensional reorganization allows the flexible circuit board to route signals without increasing the horizontal footprint, thus reducing the external width of the outer frame while still using standard components
Solution Approach 2:
The circuit board is nested within the existing structure by mounting it on the light guide plate, which is already positioned in the display assembly. This nesting approach allows the circuit board and flexible circuit board assembly to be accommodated within the existing spatial envelope without increasing external dimensions
2Length of stationary object
If the opening portion of the outer frame is made smaller to reduce external dimensions, then the width of the device is reduced, but it becomes harder for users to visually see the rotary display bodies through the opening portion
Solution Approach 1:
By moving the circuit board to the light guide plate, the patent enables the opening portion to be minimized in horizontal dimensions while maintaining adequate viewing area through vertical spatial optimization. The circuit board positioning allows the outer frame opening to be smaller without compromising visibility of the rotary display bodies
3Length of stationary object
If the liquid crystal shutter is placed close to the liquid crystal panel to reduce device width, then the external dimensions are reduced, but the thin circuit boards of the shutter bend and contact the panel, creating moire interference
Solution Approach 1:
The patent introduces a spacer as an intermediary element positioned between the liquid crystal shutter and the liquid crystal panel. This spacer maintains a precise gap that prevents the thin circuit boards of the shutter from bending and contacting the panel, thereby eliminating moire interference while allowing the shutter to be positioned close to the panel for compact device width
Solution Approach 2:
The spacer modifies the critical parameter of gap distance between the shutter and panel. By controlling this distance to be greater than zero but small enough to maintain compact dimensions, the patent resolves the contradiction between device width reduction and prevention of moire interference
Data Source
AI summary
To provide a liquid crystal display device that can be realized at lower cost, there are provided a liquid crystal panel 2, a liquid crystal shutter 3 and a light guide plate 4 placed behind the liquid crystal panel 2 in the order named, a lamp set 6a facing an end face of the light guide plate 4, a frame body 8 that supports edge portions of the liquid crystal panel 2, the liquid crystal shutter 3, and the light guide plate 4, a fixing plate 7 having a flat portion behind the light guide plate 4 and a side face that supports the lamp set 6a, a supporting plate 40 that is located behind the fixing plate 7 at a first distance away therefrom and that is partially supported by the fixing plate 7, a circuit board 20 placed behind the supporting plate 40, and a flexible circuit board 36 having one end connected to the edge portion of the liquid crystal panel 2 and the other end connected to an edge portion of the circuit board 20.