High-Resolution Display Circuit Board Alignment With Variable-Width Terminals
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Solution Overview
Problem
As display resolution increases, the reduced gap between circuit boards and terminal pitch leads to misalignment issues due to insufficient space for alignment keys, causing misalignment between circuit boards and display panel terminals.
Innovation Solution
The display device incorporates circuit boards with group terminals of varying widths, including a middle circuit board with a smaller width than outermost circuit boards, and utilizes alignment keys to maintain proper alignment, with additional features like fan-out lines and dummy lines to enhance connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of display device increases, then the display quality is improved, but the gap between circuit boards and terminal pitch decrease
Solution Approach 1:
The patent divides the circuit board structure into multiple segments with different terminal pitch configurations. Specifically, different regions of the circuit board have different terminal pitches, allowing the gap between circuit boards to be optimized in different areas. This segmentation enables high resolution display while maintaining adequate spacing through regional differentiation of terminal arrangements.
2Quantity of substance
If the terminal pitch of circuit boards is reduced, then more terminals can be accommodated, but misalignment between circuit boards and display panel pads occurs
Solution Approach 1:
The patent employs asymmetric terminal pitch design where different regions of the circuit board have different terminal spacing. This asymmetric configuration allows dense terminal arrangement in regions where space permits, while maintaining larger spacing in regions critical for alignment. The asymmetric design enables accommodating more terminals without compromising alignment accuracy through strategic spatial differentiation.
3Area of stationary object
If the area for alignment key is reduced, then circuit boards can be placed closer, but alignment between circuit boards becomes difficult
Solution Approach 1:
The patent transitions from relying solely on alignment keys to a multi-dimensional alignment approach. This includes alignment keys positioned at multiple locations, alignment features extending in different directions, and alignment reference marks distributed across the circuit board structure. By utilizing multiple spatial dimensions and distributed alignment features, adequate alignment capability is maintained even when the area for individual alignment keys is reduced.
Data Source
AI summary
A display device includes: a display panel; a pixel in a display area of the display panel; a plurality of circuit boards connected to a non-display area of the display panel; and a plurality of driving circuits on the circuit boards, wherein each of the circuit boards comprises a group terminal connected to pads of the non-display area, the group terminal comprises a plurality of terminals adjacent to each other on a corresponding circuit board, and group terminals of at least two circuit boards have different widths.