Display Device Dummy Terminals Signal Delay Short Circuit
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Solution Overview
Problem
Display devices face signal delay and short-circuit issues due to varying lengths of connecting wires and narrow distances between terminals, which affect the transmission of signals and can lead to terminal short-circuiting.
Innovation Solution
Incorporating dummy terminals between connecting terminals and using connecting wires that are 100% to 200% of the shortest distance between adjacent terminals to reduce length differences and prevent signal delays, while ensuring that dummy terminals are not electrically connected to the integrated circuit chip or printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connecting wires are used to connect pad portions, then electrical connection is achieved, but signal delay occurs due to varying wire lengths
Solution Approach 1:
Dummy terminals are pre-positioned at strategic locations between the first and second pad portions before actual signal transmission begins. These dummy terminals serve as intermediate stopping points that break down the total signal transmission distance into equal segments, ensuring that all connecting wires have matched lengths and signals arrive simultaneously at their destinations.
2Area of stationary object
If distance between adjacent connecting terminals is narrowed to reduce size, then device compactness is improved, but short-circuiting between terminals occurs
Solution Approach 1:
Dummy terminals act as intermediary elements positioned between adjacent connecting terminals. These dummy terminals serve as physical barriers that maintain adequate spacing between active terminals, preventing short-circuiting while allowing the overall device footprint to remain compact. The dummy terminals are electrically isolated or connected to reference potentials, serving purely as spacing maintainers.
3Reliability
If dummy terminals are added between connecting terminals, then signal delay is reduced and short-circuiting is prevented, but device complexity increases
Solution Approach 1:
The dummy terminals serve multiple functions simultaneously: they act as spacing maintainers to prevent short-circuiting between adjacent terminals, serve as reference potential points for signal stability, and function as equalization points to balance wire lengths. By consolidating these multiple functions into a single structural element, the overall device complexity is minimized while achieving multiple reliability improvements.
Data Source
AI summary
A display device includes a substrate including a peripheral area with an integrated circuit chip disposed therein. A first pad portion, overlaps the integrated circuit chip, and includes a plurality of first dummy terminals, and a plurality of first connecting terminals electrically connected to the integrated circuit chip. The plurality of first dummy terminals is not electrically connected to the integrated circuit chip. A second pad portion, disposed in the peripheral area, includes a plurality of second connecting terminals electrically connected to a printed circuit board. A plurality of first connecting wires electrically connect each of the plurality of first connecting terminals to one or more of the plurality of second connecting terminals. At least one of the plurality of first connecting terminals is disposed between the plurality of first dummy terminals. The plurality of first connecting wires is not electrically connected to the plurality of first dummy terminals.