Touch Display Panel Trace Routing to Reduce TDDI Coupling
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Solution Overview
Problem
Existing TDDI configurations in portable electronic devices face challenges with trace coupling and pin configuration limitations, leading to space inefficiencies and erroneous touch results due to coupling between transmitting and receiving traces, especially when held in common orientations.
Innovation Solution
Implementing alternative routing methods and pin configurations for traces and IC pins to reduce coupling effects, including rearranging trace layouts and swapping metal layers, and adapting pin positions to minimize trace proximity and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If transmitting and receiving traces are routed close together to save space, then device compactness is improved, but coupling between traces increases causing erroneous touch results
Solution Approach 1:
The patent applies dimensional separation by routing transmitting traces and receiving traces through different spatial dimensions - specifically, transmitting traces are routed through the bottom region while receiving traces are routed through the side regions (left and right sides) of the touch display panel. This three-dimensional routing strategy effectively separates traces that would otherwise be positioned close together in a two-dimensional plane, reducing coupling effects while maintaining device compactness.
2Productivity
If traces are routed alternately at sides of display to reduce length, then manufacturing efficiency is improved, but coupling between transmitting and receiving traces increases
Solution Approach 1:
The patent segments the trace routing paths by function - transmitting traces are routed through the bottom region while receiving traces are routed through the side regions. This functional segmentation separates the routing paths of transmitting and receiving traces, preventing them from running parallel and close together, thereby reducing coupling effects while maintaining manufacturing efficiency.
3Manufacturing precision
If pin configuration is fixed after IC manufacturing, then manufacturing precision is improved, but adaptability for different routing configurations is reduced
Solution Approach 1:
The patent applies preliminary action by pre-defining specific pin configurations on the IC that are optimized for the separated routing topology. The IC is manufactured with predetermined pin assignments that correspond to the bottom-routed transmitting traces and side-routed receiving traces. This preliminary configuration ensures proper signal routing while maintaining manufacturing precision, as the pin assignments are established before the IC is bonded to the touch display panel.
Data Source
AI summary
A portable device includes: an integrated circuit (IC) including a first receiver pin, a first transmitter pin, a second receiver pin and a second transmitter pin; and a touch display panel including a capacitive array. A first trace of a first plurality of traces is coupled between a leftmost transmitter element of the capacitive array and positioned closest to the capacitive array at the top and side and furthest away from the capacitive array at the bottom, and a second trace of the first plurality of traces is coupled between a rightmost transmitter element of the capacitive array and positioned furthest away from the capacitive array at the top and side and closest to the capacitive array at the bottom.