Layered Touch Display Wiring for Low-Interference Signal Sensing
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Solution Overview
Problem
Existing display devices experience increased mutual interference between electronic components and signal lines due to the growing number of signal lines and pads, which affects processing speed and data handling capacity.
Innovation Solution
A display device design that includes a base layer, circuit element layer, light emitting element layer, thin film sealing layer, and input sensing layer, with specific configurations of sensing electrodes and wiring parts to minimize interference, such as overlapping and insulated sensing electrodes forming capacitances, and connection wiring parts contacting sensing signal wirings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of signal lines and pads is increased to handle more data and improve processing speed, then productivity and data handling capacity are improved, but mutual interference between electronic components and signal lines increases
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar arrangement of signal lines to a three-dimensional stacked architecture. Multiple signal lines are arranged in different layers (first signal line layer, second signal line layer) with vertical spacing, reducing mutual interference while maintaining high data handling capacity. The sensing electrodes are also positioned in multiple layers with insulating layers between them, creating a vertical dimension that separates interfering signals.
Solution Approach 2:
The patent uses insulating layers as intermediary substances between conductive elements. The first insulating layer is positioned between the first and second signal line layers, and the second insulating layer is positioned between sensing electrodes and signal lines. These intermediary insulating layers act as barriers that prevent electrical signal interference while allowing the system to maintain high density of signal lines and pads.
2Measurement precision
If sensing electrodes are positioned closer to signal lines to improve sensing sensitivity, then sensing sensitivity is improved, but electrical interference between sensing electrodes and signal lines increases
Solution Approach 1:
The patent introduces a second insulating layer as an intermediary between the sensing electrodes and the signal lines. This insulating layer allows the sensing electrodes to be positioned in close proximity to signal lines for improved sensing sensitivity while simultaneously blocking electrical interference from affecting the sensing electrodes. The intermediary insulating layer enables both close spacing and electrical isolation.
Solution Approach 2:
The patent positions sensing electrodes and signal lines in different vertical layers rather than placing them side-by-side in the same plane. The sensing electrodes are in a first sensing electrode layer while signal lines are in signal line layers below, with insulating layers providing vertical separation. This dimensional arrangement allows close horizontal spacing for sensitivity while maintaining vertical isolation for interference reduction.
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
Enhances sensing sensitivity and reduces electrical interference, improving the overall performance and efficiency of the display device.
Implementation Method 1
The sensing electrode includes a first sensing electrode; and a second sensing electrode electrically insulated from the first sensing electrode to form a capacitance
Data Source
AI summary
A display device includes a base layer including an active area and a peripheral area outside the active area, a circuit element layer including a pixel circuit in the active area and a driving voltage wiring located in the peripheral area to supply a driving voltage to the pixel circuit. A light emitting element layer including a plurality of light emitting elements on the circuit element layer, a thin film sealing layer to cover the light emitting element layer, and an input sensing layer on the thin film sealing layer and including a sensing electrode and a sensing signal wiring part connected to the sensing electrode. The circuit element layer includes a connection wiring part overlapping the driving voltage wiring in the peripheral area and contacts the sensing signal wiring part. The connection wiring part is at a different layer from the driving voltage wiring.