Thin Film Transistor Array Panel Partition Design for Inkjet Printing
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Solution Overview
Problem
Manufacturing liquid crystal displays with pixel electrodes and color filters on different panels poses alignment challenges, leading to alignment errors and increased manufacturing time and cost due to the complexity of forming partitions with varying shapes to enclose color filters.
Innovation Solution
A thin film transistor array panel design with a partition and pixel electrode having various patterns, where the partition is formed with a quadrangle shape and includes an expansion portion, allowing for the use of a single mask for different patterns and minimizing the overall area of the partition to increase the aperture ratio, and the color filter is filled using an inkjet printing method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If partitions are formed with various shapes to enclose color filters corresponding to pixel electrode patterns, then color filter enclosure is improved, but device complexity and manufacturing cost increase due to requiring various mask patterns
Solution Approach 1:
The partition is designed with a universal quadrangle shape that can enclose color filters for different pixel electrode patterns (circular, square, rectangular) using the same mask pattern. This single partition structure serves multiple functions across different pixel types, eliminating the need for various specialized mask patterns while maintaining precise color filter enclosure.
2Manufacturing precision
If partitions are formed with various shapes to enclose color filters, then color filter enclosure is improved, but manufacturing time and cost increase
Solution Approach 1:
The universal quadrangle-shaped partition allows a single mask pattern to be reused across all pixel types, significantly reducing the number of mask fabrication and alignment steps required. This simplification directly reduces manufacturing time while maintaining precise color filter enclosure for all pixel electrode patterns.
3Manufacturing precision
If partition area is increased to prevent color filter overflow, then color filter containment is improved, but aperture ratio decreases
Solution Approach 1:
The partition is designed with localized expansion portions only at specific positions where color filter overflow is most likely to occur, rather than uniformly increasing the partition area throughout. This targeted approach provides sufficient containment where needed while minimizing the overall partition area to preserve the aperture ratio.
4Adaptability or versatility
If pixel electrodes and color filters are formed on different display panels, then manufacturing flexibility is improved, but alignment precision deteriorates
Solution Approach 1:
The invention merges the formation of pixel electrodes and color filters into a single integrated process on the same display panel. By combining these previously separate operations, the patent eliminates alignment errors between panels while maintaining manufacturing flexibility through the use of a universal partition design that accommodates various pixel electrode patterns.
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 design reduces manufacturing complexity and cost by allowing for efficient alignment of pixel electrodes and color filters, minimizing light leakage, and preventing color filter overflow, while maintaining a high aperture ratio and reducing the need for multiple mask patterns.
Implementation Method 1
the color filter may be formed by an inkjet printing method. In the ink jet method, liquid ink is sprayed (e.g., jetted) to predetermined divided portions to implement each ink-colored image
Data Source
AI summary
A thin film transistor array panel includes an insulating substrate, a gate line and a data line disposed on the insulating substrate and insulated from and intersecting each other, a thin film transistor connected to the gate line and the data line, a partition disposed corresponding to the gate line and the data line and defining a color filter filling region, a color filter disposed in the filling region, a passivation layer disposed on the color filter and the partition, and a pixel electrode disposed on the passivation layer and connected to the thin film transistor through a contact hole disposed through the passivation layer and the color filter. A plane shape of the color filter filling region is substantially a rectangle.