Display Device Alignment Using Variable-Width Group Terminals
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Solution Overview
Problem
As display device 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 pads.
Innovation Solution
The display device incorporates circuit boards with group terminals of varying widths, including outermost and middle circuit boards with different widths, and employs alignment keys to maintain proper alignment, with specific positioning of alignment keys relative to terminal sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display device is increased, then the display quality is improved, but the gap between circuit boards and terminal pitch are reduced making alignment difficult
Solution Approach 1:
The patent divides the circuit board structure into multiple segments with different terminal pitch specifications. Outermost circuit boards use a first terminal pitch while middle circuit boards use a second terminal pitch, allowing each segment to be optimized for its specific function and alignment requirements
Solution Approach 2:
Different regions of the circuit board system are assigned different terminal pitch characteristics. The outermost circuit boards have larger terminal pitch for better alignment, while middle circuit boards have smaller terminal pitch for higher resolution, creating local optimization throughout the system
2Area of stationary object
If the gap between circuit boards is reduced to accommodate high resolution, then the device area is reduced, but the area for placing alignment keys becomes insufficient
Solution Approach 1:
The alignment function is segmented and distributed across multiple locations. Instead of relying on a single alignment key, the patent places alignment keys at multiple positions including between outermost and middle circuit boards, ensuring alignment can be achieved even when gaps are reduced
Solution Approach 2:
The patent introduces non-conductive spacers as intermediary elements between circuit boards. These spacers maintain precise gaps while providing reference features for alignment, enabling both reduced overall device area and sufficient alignment key placement area
3Quantity of substance
If the terminal pitch of circuit boards is reduced, then more terminals can be accommodated, but misalignment between terminals and pads occurs
Solution Approach 1:
The terminal configuration is segmented into different pitch specifications based on location. Outermost circuit boards use a first terminal pitch optimized for alignment, while middle circuit boards use a second terminal pitch optimized for terminal density, allowing both alignment precision and high terminal quantity to be achieved
Data Source
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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.