Transparent Common Voltage Line for LCD Sealant Inspection
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Solution Overview
Problem
The existing liquid crystal display (LCD) devices with conductive balls in the sealant overlap the common voltage line, making it difficult to perform effective visual inspections of the sealant after the completion of the production process due to the opaque metal common voltage line.
Innovation Solution
Incorporating a transparent conductive material for the common voltage line or creating etched portions in the common voltage line to form observation regions, allowing for visual inspection of the sealant without overlapping with opaque metal, and using conductive balls to connect the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common voltage line is made of opaque metal to ensure electrical conductivity, then electrical connection is improved, but visual inspection of the sealant becomes difficult
Solution Approach 1:
The common voltage line is divided into multiple segments: opaque metal portions for electrical connection and transparent observation portions for visual inspection. This segmentation allows the line to simultaneously fulfill both electrical conductivity and inspection requirements without compromising either function.
2Reliability
If the sealant overlaps the common voltage line to ensure electrical connection through conductive balls, then electrical connectivity is improved, but inspection capability deteriorates due to opaque metal blocking the view
Solution Approach 1:
Different portions of the common voltage line have different optical properties: opaque sections provide electrical connection while transparent sections enable visual inspection. The sealant overlaps with both types of sections, ensuring electrical connectivity through conductive balls in opaque areas while allowing inspection in transparent areas.
3Difficulty of detecting and measuring
If the common voltage line is made completely transparent to allow visual inspection, then inspection capability is improved, but electrical conductivity deteriorates
Solution Approach 1:
The common voltage line combines opaque and transparent segments, where opaque portions provide electrical conductivity and transparent portions enable visual inspection. This segmented approach ensures both electrical functionality and inspection capability are maintained simultaneously.
Data Source
AI summary
A liquid crystal display module includes an observation region to allow a visual inspection be performed after bonding of the substrates for inspecting the sealant that may be otherwise blocked by the common voltage line. An embodiment of a liquid crystal display device includes a first electrode on a first substrate, a second electrode and a third electrode on a second substrate, the second electrode electrically contacting the first electrode at a first portion and the third electrode at a second portion, and including a transparent conductive material, a sealant attaching the first and second substrates together in a sealant region, the sealant between the first and second electrodes and the sealant including a plurality of conductive balls for electrically connecting the first and second electrodes, and a liquid crystal layer between the attached first and second substrates and within the sealant.