Data Line Segmentation and Insulation for LCD Short-Circuit Prevention
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Solution Overview
Problem
Liquid crystal display (LCD) devices face reliability issues due to physical damage of data lines during testing, which can lead to short-circuiting and decreased performance.
Innovation Solution
The design includes a data line configuration with a first and second portion, where the second portion is in the peripheral area and covered by an insulating pattern, and a protruding pattern on the data line is completely covered by the insulating pattern to prevent damage during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If data lines are exposed during testing to enable contact testing, then testing can be performed, but the data lines may be physically damaged leading to short-circuiting
Solution Approach 1:
The data line is divided into two portions: a first portion in the display area that remains exposed for testing, and a second portion in the peripheral area that is covered by an insulating pattern. This segmentation allows testing to be performed on the exposed first portion while protecting the second portion from physical damage during testing operations.
Solution Approach 2:
An insulating pattern is introduced as an intermediary element between the data line and the testing environment. This insulating pattern covers the second portion of the data line in the peripheral area, acting as a protective barrier that prevents physical damage while allowing the first portion to remain accessible for testing.
2Reliability
If data lines are covered with insulating material, then physical damage is prevented, but testing accessibility is reduced
Solution Approach 1:
The data line coverage is segmented such that the first portion in the display area remains uncovered and exposed for testing, while only the second portion in the peripheral area is covered by the insulating pattern. This selective segmentation maintains testing accessibility while providing protection where needed.
Solution Approach 2:
The insulating pattern is applied locally only to the second portion of the data line in the peripheral area, while the first portion in the display area remains uncovered. This local application of insulation provides protection precisely where physical damage is most likely to occur during testing, while maintaining testing accessibility in the display area.
Data Source
AI summary
A display device includes a first substrate including a display area and a peripheral area disposed in a periphery of the display area. A gate line is disposed in the display area. A data line is insulated from the gate line and intersects the gate line. The data line includes a first portion and a second portion. The first portion is disposed in the display area, and the second portion is connected to the first portion and is disposed in the peripheral area. A thin-film transistor (TFT) is disposed in the display area of the first substrate and is connected to the gate and data lines. A first insulating pattern is disposed on the TFT. A second insulating pattern is disposed in the peripheral area and covers a part of the second portion of the data line. The second insulating pattern includes a same material as the first insulating pattern.