Corner Alignment Mark Layout for Narrow Frame Displays
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Solution Overview
Problem
The reduction in frame width of display panels makes it difficult to accommodate the flexible printed circuit board, terminal portions, and alignment marks, making it challenging to maintain the necessary spaces for mounting and signal transmission.
Innovation Solution
A mounting substrate with corner portions defined by edge portions, featuring alignment marks with parallel side portions and inclined traces that reduce the space required for alignment marks, allowing for increased mounting space and signal transmission capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frame width of the display panel is reduced, then the definition of the display panel is enhanced, but it becomes difficult to keep the space for mounting the flexible printed circuit board, terminal portions, and alignment marks
Solution Approach 1:
The alignment mark is divided into multiple side portions (first side portion, second side portion, third side portion) that can be independently configured. This segmentation allows each portion to be optimized for different functions: the first and second side portions provide positioning references while the third side portion connects to traces, thereby reducing the total space required for the alignment mark while maintaining its functionality.
Solution Approach 2:
The alignment mark is designed with side portions that are parallel to the edge portions of the substrate, utilizing the two-dimensional plane more efficiently. By aligning the sides of the alignment mark with the edges of the substrate, the design optimizes space utilization in the available mounting area, allowing for reduced frame width while maintaining necessary spacing for components and traces.
2Measurement precision
If the frame width is reduced and the definition is enhanced, then the display quality is improved, but the space for arranging traces and mounting components is decreased
Solution Approach 1:
The alignment mark is configured with different side portions having different orientations and functions. The first side portion is parallel to the first edge portion, the second side portion is parallel to the second edge portion, and the third side portion connects to the traces. This local differentiation allows optimal space utilization in different regions, enabling more traces to be arranged within the reduced frame width while maintaining signal transmission capacity.
Solution Approach 2:
The alignment mark is designed with an outline that may be circular or curved rather than strictly angular. This curved configuration allows the alignment mark to fit more efficiently into the corner portion of the substrate, maximizing the use of available space and allowing additional room for traces and mounting components within the reduced frame width.
Data Source
AI summary
An array substrate includes a glass substrate GS, an alignment mark 29, and first traces 19. The glass substrate GS has a corner portion 30 having an outline defined by a first edge portion 11b1 and a second edge portion 11b2 crossing the first edge portion 11b1. The alignment mark 29 is disposed at the corner portion 30 and used as the positioning index in mounting a driver 21 and a flexible printed circuit board 13. The alignment mark 29 at least includes first and second side portions 29a, 29b parallel to the first and second edge portions 11b1, 11b2, respectively. One end of the second side portion 29b is continuous to one end of the first side portion 29a. The alignment mark 29 has an outline that is on a same plane with a reference line BL connecting other ends of the first side portion 29a and the second side portion 29b linearly. The first traces 19 include inclined portions 31 that are inclined with respect to the first and second side portions 29a, 29b along the reference line BL.