Shielding Wire Layout for TDDI Signal Stability
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Solution Overview
Problem
In Touch and Display Driver Integration (TDDI) systems, the integration of touch-controlling and displaying chips leads to mutual interference due to coupling capacitance between touch-controlling and data lead wires, affecting signal stability and touch-controlling sensitivity.
Innovation Solution
A displaying base plate with a fanout region that includes shielding wires, where at least one shielding wire is earthed or connected to a constant electric potential, and additional shielding wires are provided to transmit signals similar to the touch-controlling signal, effectively reducing coupling capacitance and increasing touch-controlling sensitivity without compromising signal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch-controlling and displaying chips are integrated into the same chip, then device integration is improved, but mutual interference between touch-controlling and data lead wires increases due to coupling capacitance
Solution Approach 1:
The patent introduces shielding wires as intermediary elements between the touch-controlling lead wire and data lead wire. These shielding wires act as mediators that block the harmful coupling capacitance between the two lead wires, allowing the integrated TDDI structure to function without mutual interference.
Solution Approach 2:
The patent extracts the shielding function from the main lead wire structure by introducing separate shielding wires. This separation allows the touch-controlling and data lead wires to maintain their signal transmission functions while the extracted shielding wires handle the interference protection function.
2Object-affected harmful factors
If shielding wires are added between touch-controlling and data lead wires, then coupling capacitance is reduced, but device complexity increases
Solution Approach 1:
The patent merges the shielding wires with the existing lead wire structure in the fanout region, where the shielding wires are integrated alongside the touch-controlling and data lead wires. This merging approach reduces the increase in device complexity by combining multiple functions within the same structural space.
Solution Approach 2:
The shielding wires are designed as simplified copies of the lead wire structure, using similar materials and fabrication processes. This copying approach allows the shielding function to be added without significantly increasing manufacturing complexity, as the shielding wires follow the same production methodology as the existing lead wires.
3Reliability
If shielding wires are earthed or connected to constant electric potential, then signal stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The shielding wires are designed to automatically achieve their shielding function through standard grounding connections to the common electrode layer. The system self-services by using the existing electrode structure as the grounding path, eliminating the need for additional precision grounding mechanisms.
Solution Approach 2:
The common electrode layer serves multiple functions: it acts as the grounding path for the shielding wires, provides the baseline electric potential for the display, and maintains the overall electrical structure. This multi-functionality reduces manufacturing precision requirements by reusing existing structures for multiple purposes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively shields coupling capacitance between touch-controlling and data lead wires, ensuring stable displaying functions and enhanced touch-controlling sensitivity by reducing the load on touch-controlling signals.
Implementation Method 1
a first lead wire and a second lead wire extending in a first direction and arranged at different layers... the first lead wire is configured for transmitting a first signal, and the second lead wire is configured for transmitting a second signal
Implementation Method 2
at least one shielding wire located between the touch-controlling lead wire and the data lead wire... effectively shields coupling capacitance between touch-controlling and data lead wires
Data Source
AI summary
A displaying base plate and a displaying device, wherein the displaying base plate includes a displaying region, a binding region, and a fanout region located between the displaying region and the binding region, the fanout region includes a touch-controlling lead wire, a data lead wire, and at least one shielding wire located between the touch-controlling lead wire and the data lead wire, the at least one shielding wire includes a first shielding wire, and the first shielding wire is earthed or is connected to a constant electric potential.