LCD Grounding Routes for Static Discharge and Inspection
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Solution Overview
Problem
Horizontal electric field type liquid crystal display apparatuses are prone to display distortion due to external static electricity, which can charge the transparent substrate, and existing grounding methods lack reliable inspection for conductive member resistance, leading to potential disconnection issues.
Innovation Solution
The liquid crystal display apparatus incorporates multiple grounding routes, including a first conductive member connected to the substrate's grounding wiring and a second conductive member connected to the housing, with a flexible substrate and transparent conductive film on the opposing substrate, allowing for reliable grounding and inspection through resistance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single grounding route is used for the transparent conductive film, then the device structure is simple, but the grounding reliability is low because disconnection causes display distortion
Solution Approach 1:
The grounding system is divided into multiple independent grounding routes (first grounding route through the flexible substrate and second grounding route through the housing), so that if one route is disconnected, the other can still maintain grounding functionality, thereby improving grounding reliability without requiring a single complex grounding path
Solution Approach 2:
Multiple grounding routes are established in advance to prevent the harmful effect of disconnection. By having redundant grounding paths built into the structure before operation, the system is cushioned against potential failures in any single grounding route, ensuring continuous grounding reliability
2Measurement precision
If sensory inspection is used to check grounding resistance, then the inspection process is simple, but the measurement precision is insufficient to detect disconnection issues
Solution Approach 1:
The manual sensory inspection method is replaced with an automated electrical resistance measurement system using a resistance meter. This substitution enables precise quantitative measurement of grounding resistance values, allowing detection of disconnection issues that cannot be identified through sensory inspection alone, while the measurement process remains integrated into the manufacturing flow
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 maintains grounding even if one route is broken, enhances the reliability of the grounding connection, and improves display quality by preventing static electricity-induced distortions, while allowing for reliable inspection without sensory checks.
Implementation Method 1
measuring a resistance value between the first grounding and the second grounding route by using a resistance meter
Data Source
AI summary
A liquid crystal display apparatus includes: a display device a first substrate having a pixel electrode and a reference electrode, a second substrate facing the first substrate; a flexible substrate; a housing that accommodates the display device; a transparent conductive film that is formed on a surface of the second substrate; a first conductive member and a second conductive member, wherein one end portion of the first conductive member and one end portion of the second conductive member are connected to the transparent conductive film; a first grounding route, which is configured by at least the first conductive member that is connected to a grounding wiring formed at the peripheral part of the first substrate and the flexible substrate; and a second grounding route, which is configured by at least the second conductive member that is connected to the housing.