Thin Film Transistor Substrate Stopper Layers Prevent Light Leakage
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Solution Overview
Problem
Thin film transistor substrates in liquid crystal displays are prone to light leakage due to deformation under external pressure, which increases with thickness reduction, and existing solutions to mitigate this issue, such as increasing the line width of the black matrix, result in a decrease in aperture ratio.
Innovation Solution
Incorporating stopper layers spaced apart on the same plane as the touch sensing line, with column spacers overlapping the space between them, to limit movement and prevent damage to the alignment film, thereby minimizing light leakage without reducing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the substrate thickness is reduced to achieve a thinner liquid crystal display, then the display becomes thinner and lighter, but the substrate is easily deformed under pressure causing increased light leakage
Solution Approach 1:
The patent forms stopper layers on the substrate surface before assembling the liquid crystal display, creating predetermined positions that will later restrict column spacer movement. This preliminary preparation allows the thin substrate to maintain structural integrity under pressure without requiring thicker materials.
Solution Approach 2:
The stopper layers act as intermediary structures between the column spacers and the substrate, mediating the interaction by providing a controlled interface that limits spacer movement while preserving the thin substrate design. This intermediary element solves the deformation problem without increasing substrate thickness.
2Object-affected harmful factors
If the line width of the black matrix around the column spacer is increased to prevent light leakage, then light leakage is reduced, but the aperture ratio decreases
Solution Approach 1:
The patent extracts the light leakage prevention function from the black matrix and relocates it to the stopper layers. By removing the need for the black matrix to perform this function, the black matrix line width can be reduced, thereby increasing the aperture ratio while still preventing light leakage through the stopper layer mechanism.
Solution Approach 2:
The stopper layers replicate the light leakage prevention function previously provided by the black matrix, but with a different structural approach that doesn't require increased line width. This functional copying allows the aperture ratio to be maintained or improved.
3Reliability
If the column spacer moves under external pressure, then the alignment film is damaged causing light leakage, but restricting movement reduces display performance
Solution Approach 1:
The stopper layers are positioned specifically at locations where column spacers may move under pressure, providing localized restriction only where needed. This local quality approach prevents alignment film damage at critical points while maintaining overall display performance and allowing natural spacer behavior in non-critical areas.
Data Source
AI summary
A substrate including a thin film transistor, which may prevent light leakage without a reduction in an aperture ratio, and a display panel having the same are discussed. In the display panel, stopper layers are spaced apart from each other with a space interposed therebetween and are located on the same plane as a touch sensing line, and a column spacer is located to overlap the space between the stopper layers.