Display Device Inspection Terminals for Covered Conductive Layers
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Solution Overview
Problem
The challenge in inspecting liquid crystal display devices is that the surface of the transparent conductive resin portion is often covered by a frame-shaped bezel, making direct contact and resistance measurement impossible, which hampers the inspection of proper connection to the ground.
Innovation Solution
A display device configuration with conductive members extending from the display surface to the adjacent substrate, connection wiring lines, and inspection terminals on the panel connection board allows for resistance measurement between the conductive layer and ground, even when the conductive layer is covered, enhancing inspection flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive layer is covered by a frame-shaped bezel during production, then the display device structure is complete and protected, but direct contact with the conductive layer for inspection becomes impossible
Solution Approach 1:
The patent introduces conductive members that extend from the conductive layer through the bezel structure to external terminals. These conductive members act as intermediaries, allowing inspection equipment to measure resistance without directly contacting the covered conductive layer, thus resolving the contradiction between structural completeness and inspection accessibility
Solution Approach 2:
The conductive members extend in the thickness direction of the display device, creating a new spatial dimension for electrical connection. This vertical extension allows inspection access from the external terminal side rather than requiring direct access to the conductive layer on the display surface, solving the accessibility problem while maintaining structural integrity
2Reliability
If the conductive layer is covered by a frame-shaped bezel, then the display device structure is complete, but inspection timing flexibility is reduced
Solution Approach 1:
The conductive members are formed during the manufacturing process before the bezel completely covers the conductive layer. This preliminary action ensures that inspection pathways are established in advance, allowing resistance measurements to be performed at various stages of production without compromising the final structural integrity of the display device
Solution Approach 2:
The conductive members serve as persistent intermediary structures that remain accessible throughout the manufacturing process. They enable inspection at multiple timing points (before and after bezel installation) while the final bezel structure maintains its protective function, thus preserving both structural integrity and inspection timing flexibility
3Measurement precision
If direct contact with the conductive layer is required for resistance measurement, then measurement accuracy is ensured, but inspection becomes impossible when the conductive layer is covered
Solution Approach 1:
The conductive members act as faithful electrical intermediaries that preserve the electrical characteristics of the conductive layer while providing external access. By measuring resistance through these intermediaries, the inspection system maintains measurement accuracy equivalent to direct contact measurement, while simultaneously enabling inspection of covered conductive layers, thus resolving both measurement precision and inspection applicability requirements
Solution Approach 2:
The conductive members serve multiple functions: they provide electrical connection for charge escape, enable resistance measurement for quality inspection, and maintain structural integrity. This multi-functionality allows the same structure to satisfy both precise measurement requirements and broad inspection applicability across different production scenarios
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the timing flexibility of inspections by enabling resistance measurement without direct contact, ensuring proper connection verification and maintaining high display quality by reducing charge accumulation on the display surface.
Implementation Method 1
Charges on the display surface of the first substrate escape to a ground through the conductive member, a connection wiring line, and an FPC-side connection wiring line
Data Source
AI summary
A liquid crystal display device 10 includes a liquid crystal panel 11 including a CF substrate 11a having a display surface 11DS and an array substrate 11b disposed over a surface of the CF substrate 11a opposite the display surface 11DS, a control circuit board 12 connected to the array substrate 11b, a conductive layer 19 on the display surface 11DS of the CF substrate 11a, a plurality of conductive members 20 each having a first end connected to the conductive layer 19, a plurality of connection wiring lines 21 having first ends connected to respective second ends of the plurality of conductive members 20, a ground 12a connected to a second end of at least one of the plurality of connection wiring lines 21, and a plurality of inspection terminals 22 connected to the second ends of the plurality of connection wiring lines 21.