TFT Array Light Blocking Assistance Member for Contact Hole Reflection
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Solution Overview
Problem
In liquid crystal displays (LCDs), light reflected through contact holes in the peripheral area deteriorates display quality due to the lack of light blocking coverage, which also complicates the manufacturing process and affects transmittance.
Innovation Solution
A thin film transistor array panel with a light blocking member and a light blocking assistance member, both made from the same material as a colored spacer, covers contact holes in the peripheral area to reduce light reflection and improve display quality, while simplifying the manufacturing process by enhancing transmittance and preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light blocking member is formed in the thin film transistor array panel, then transmittance is improved and manufacturing process is simplified, but contact holes in the peripheral area are not covered causing light reflection that deteriorates display quality
Solution Approach 1:
The light blocking structure is divided into two segments: a main light blocking member covering the display area and peripheral signal lines, and additional light blocking members specifically covering contact holes in the peripheral area. This segmentation allows each component to perform its specialized function without compromising the other.
Solution Approach 2:
Different regions of the panel receive different light blocking treatments. The display area gets comprehensive light blocking from the main light blocking member, while the peripheral contact holes receive targeted light blocking from additional light blocking members, optimizing both display quality and manufacturing efficiency.
2Ease of manufacture
If contact holes are left uncovered in the peripheral area, then manufacturing process remains simple, but light reflected through contact holes deteriorates display quality
Solution Approach 1:
The additional light blocking members are formed simultaneously with the main light blocking member in the same manufacturing process step, using a single coating and curing operation. This preliminary action ensures contact holes are covered without adding separate manufacturing steps, maintaining process simplicity while improving display quality.
Solution Approach 2:
The formation of light blocking members for both the display area and peripheral contact holes is merged into a single manufacturing operation. The same light blocking material and application process are used for both regions, combining multiple functions into one step and eliminating the need for separate processing operations.
Data Source
AI summary
A thin film transistor (“TFT”) array panel includes; a substrate including a display and peripheral area, a display area signal line and a display area TFT disposed in the display area, the display area TFT connected to the display area signal line, a plurality of peripheral area signal lines, a light blocking member disposed on the display area signal line, the display area TFT, and the peripheral area signal lines, a transparent connector connecting one of peripheral area signal lines and another one of the peripheral area signal lines through a contact hole passing through the light blocking member, a pixel electrode connected to the display area TFT, a spacer disposed on a layer above the light blocking member, and a light blocking assistance member composed of the same material as the spacer on the transparent connector, the light blocking assistance member covering at least the contact hole.