Inspection Circuit Placement in Narrow Frame LCDs
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Solution Overview
Problem
The challenge is to effectively dispose and inspect the inspection circuit in liquid crystal display devices when the driver IC is removed from the terminal area and placed on a flexible wiring circuit substrate, while maintaining a narrow frame area.
Innovation Solution
The solution involves forming an inspection circuit between the display area and the terminal area on the TFT substrate, which includes switching portions to connect video signal lines to either first or second terminals, and ensuring the inspection circuit is protected by an insulating film and the counter substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the driver IC is removed from the terminal area and placed on the flexible wiring circuit substrate, then the frame area is narrowed, but the inspection circuit disposition becomes problematic
Solution Approach 1:
The inspection circuit is positioned in the frame area between the display area and terminal area, utilizing the vertical/dimensional space rather than horizontal space. This allows the inspection circuit to be integrated without increasing the frame width, resolving the contradiction between narrow frame area and inspection circuit disposition.
Solution Approach 2:
The inspection circuit acts as an intermediary component positioned between the display area and terminal area. It provides inspection functionality while maintaining the narrow frame structure by utilizing the existing space between other components, thus resolving the disposition problem.
2Length of stationary object
If the driver IC is removed from the terminal area, then the terminal area width is reduced, but the inspection circuit cannot be properly disposed
Solution Approach 1:
Instead of placing the inspection circuit in the terminal area (horizontal dimension), it is positioned in the frame area between display and terminal areas (vertical/dimensional arrangement). This resolves the contradiction by using different spatial dimensions.
Solution Approach 2:
The display device structure is segmented into distinct functional areas: display area, frame area, and terminal area. The inspection circuit is assigned to the frame area, separating it from the terminal area and allowing independent optimization of terminal area width.
3Reliability
If the inspection circuit is formed between the display area and terminal area, then wiring inspection is enabled, but the frame area increases
Solution Approach 1:
The frame area serves multiple functions: it provides structural support, houses the inspection circuit, and maintains the display-terminal area connection. This multi-functionality allows the inspection circuit to be integrated without dedicating separate space, thus not increasing the overall frame area.
Solution Approach 2:
The inspection circuit is merged into the frame area structure, combining the structural frame function with the inspection functionality. This integration allows wiring inspection capability to be achieved without adding separate dedicated space for the inspection circuit.
Data Source
AI summary
An inspection circuit is properly protected in a display device, which the driver IC is not on the terminal area. A liquid crystal display device comprising a TFT substrate having a display area, in which video signal lines are formed, and a terminal area; a counter substrate overlapping with the display area of the TFT substrate; the counter substrate and the TFT substrate are adhered by the seal material, the display area is formed in an area surrounded by the seal material; wherein the flexible wiring circuit substrate connects to the terminal area, the driver IC, which supplies video signals to the video signal lines, is not installed in the terminal area, the inspection circuit is formed between the display area and the terminal area, wherein the inspection circuit overlaps with the counter substrate in a plan view.