Active Matrix Substrate Terminal Layout for Narrower Display Frames
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Solution Overview
Problem
Display devices with higher resolution and touch panel functions face challenges in achieving narrower frames due to the increased number of terminals, leading to design restrictions and higher manufacturing costs.
Innovation Solution
The active matrix substrate is configured with a terminal group that includes center and end terminal groups, where end terminal groups consist of a mixture of first and second terminals, reducing the convergence of wires and securing space for terminal placement, thereby minimizing the frame size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of terminals is increased to support higher resolution and touch panel functions, then the display device can achieve higher resolution and touch functionality, but the frame size increases and design flexibility is reduced
Solution Approach 1:
The terminal group is divided into a center terminal group and end terminal groups. The end terminal groups are positioned at the ends of the substrate in the column direction, while the center terminal group is positioned in the central region. This segmentation allows wires to be routed more efficiently, reducing the overall frame size while supporting the required number of terminals for touch panel functionality.
Solution Approach 2:
Different terminal groups are assigned different positions and functions within the substrate. The end terminal groups handle specific wire connections at the edges, while the center terminal group manages central connections. This local differentiation optimizes wire routing and minimizes the frame size while maintaining all necessary terminal functions.
2Ease of manufacture
If terminals are arrayed at equal spacings with the same area, then the placement is simple and uniform, but the frame size cannot be minimized for high-resolution displays
Solution Approach 1:
The terminal group is segmented into center and end terminal groups with different positioning strategies. The end terminal groups are placed at the substrate ends to optimize wire routing, while the center terminal group is positioned centrally. This segmentation enables frame size minimization while maintaining manufacturability through systematic placement patterns.
Solution Approach 2:
The terminal arrangement transitions from symmetric equal-spacing to asymmetric positioning where end terminal groups are located at the ends of the substrate and the center terminal group is positioned in the central region. This asymmetric layout optimizes wire routing paths, reducing frame size while remaining practical for manufacturing.
3Device complexity
If the terminal group length is increased to accommodate more terminals, then the wire convergence is reduced, but the frame size increases
Solution Approach 1:
By segmenting terminals into center and end groups, the patent distributes wire routing tasks across different spatial regions. End terminal groups handle edge wire connections while the center terminal group manages central connections, reducing overall wire convergence complexity and minimizing frame size.
Solution Approach 2:
The terminal arrangement utilizes the column direction positioning to optimize wire routing in the row direction. By positioning end terminal groups at the ends of the substrate in the column direction, wires can be routed more efficiently across the substrate, reducing frame size while managing routing complexity.
Data Source
AI summary
An active matrix substrate includes a glass substrate 26, a plurality of pixel electrodes 40 arrayed in a matrix, a plurality of TFTs 43, a plurality of common electrodes 42, a terminal group 60 provided at one end of a Y-axis direction on top of the glass substrate 26 and constituted by a plurality of terminals 61 and 62 placed along an X-axis direction, wires 71 that electrically connect the terminals 61 to the TFTs 43, and wires 72 that electrically connect the terminals 62 to the common electrodes 42. The terminal group 60 includes a center terminal group 64, constituted by a plurality of the first terminals 61, that constitutes a center portion of the terminal group 60 in the X-axis direction, and end terminal groups 65L and 65R, each constituted by a plurality of the first terminals and a plurality of the second terminals, that constitute both side portions, respectively, of the terminal group 60 in the X-axis direction and in each of which the second terminals 62 are each disposed between two of the first terminals 61 adjacent to each other.