Liquid Crystal Display Substrate Positioning via Rear Case Pins
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in reducing overall thickness and securing accurate positioning of the signal processing substrate when placed on a reflection sheet, as existing fixing methods lead to positional displacement and poor assembly due to the lack of precise positioning pins.
Innovation Solution
The solution involves placing the signal processing substrate on a reflection sheet exposed from the rear case, with one or more positioning mount components and corresponding locking portions on the substrate and rear case, allowing for accurate alignment and fixation without the need for screws, thereby reducing the device's thickness and frame region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal processing substrate is placed on the rear case with a substrate cover attached, then the substrate is protected, but the overall thickness of the device becomes large
Solution Approach 1:
The signal processing substrate is extracted from the rear case structure and placed directly on the reflection sheet. This removes the need for the substrate to be mounted on the rear case interior surface, thereby reducing the overall thickness while maintaining protection through the reflection sheet and housing structure.
Solution Approach 2:
The substrate mounting approach transitions from a vertical stacking arrangement (rear case interior mounting) to a horizontal placement arrangement (direct placement on reflection sheet). This dimensional change allows the substrate to be positioned at a different spatial level, reducing the cumulative thickness.
2Length of stationary object
If the signal processing substrate is placed on the reflection sheet by removing part of the rear case, then the overall thickness is reduced, but positioning accuracy becomes difficult to secure
Solution Approach 1:
Positioning pins are pre-formed on the rear case at predetermined locations before assembly. These pins protrude from the rear case exterior and are designed to fit into corresponding positioning holes in the signal processing substrate, establishing accurate positioning relationships in advance of the final assembly step.
Solution Approach 2:
The positioning pins act as intermediary elements between the rear case and the signal processing substrate. These pins provide the mechanical interface that transfers and secures the positioning function, allowing the substrate to be accurately positioned on the reflection sheet without requiring complex mounting structures.
3Manufacturing precision
If positioning pins are formed on the rear case to position the signal processing substrate, then positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The positioning function is merged with the existing rear case structure. The positioning pins are formed as integral parts of the rear case, combining the case's structural function with the positioning function in a single component. This eliminates the need for separate positioning mechanisms and reduces overall device complexity.
Solution Approach 2:
The rear case serves multiple functions: it provides structural support, protection, and positioning for the signal processing substrate. By making the rear case multi-functional, the design avoids adding dedicated positioning components, thereby reducing device complexity while maintaining positioning accuracy.
Data Source
AI summary
A liquid crystal display device includes: a chassis in which a liquid crystal panel and a reflection sheet are placed; a rear case attached to a back face of the chassis where a part of the reflection sheet is exposed; and a signal processing substrate that is placed on the reflection sheet and that is used for driving the liquid crystal panel. A positioning mount component is mounted on the signal processing substrate, a positioning pin capable of locking the positioning mount component is formed at a position corresponding to the positioning mount component in the rear case, and the positioning mount component is fitted to the corresponding positioning pin to thereby position the signal processing substrate at a desired position on the reflection sheet.