Display Sensor Wire Resistance Layout for Noise-Stable Touch Signals
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Solution Overview
Problem
Noise generated by display panels affects drive signals for detection electrodes, leading to signal distortion in display devices.
Innovation Solution
The display device incorporates first and second detection electrodes arranged in different directions with varying resistance values, connected by detection wires that adjust resistance based on distance from the circuit board to minimize noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If detection electrodes are arranged on the display panel to detect external input, then touch detection capability is improved, but noise from the display panel distorts the drive signals affecting detection accuracy
Solution Approach 1:
The patent applies local quality by varying the resistance values of different detection wires based on their specific positions relative to noise sources. Detection wires closer to the circuit board have different resistance characteristics than those farther away, allowing each wire to be optimized for its local noise environment. This position-dependent resistance variation compensates for noise-induced signal distortion at different locations on the display panel.
Solution Approach 2:
The patent changes the electrical parameter (resistance value) of detection wires according to their position on the display panel. By adjusting resistance values to match the noise characteristics at different locations, the system compensates for signal distortion. This parameter optimization allows the detection system to maintain accuracy despite varying noise levels across the panel surface.
2Ease of manufacture
If uniform resistance values are used for all detection wires, then manufacturing simplicity is maintained, but signal distortion varies across different detection electrodes reducing detection accuracy
Solution Approach 1:
Instead of uniform resistance values, the patent implements local quality by assigning different resistance values to detection wires based on their positions. Detection wires nearer to the circuit board have one resistance characteristic, while those farther away have different resistance characteristics. This position-specific optimization ensures consistent signal quality across all detection electrodes despite the added manufacturing complexity.
3Object-affected harmful factors
If detection wires are made with higher resistance to reduce noise impact, then noise immunity is improved, but signal strength decreases affecting detection sensitivity
Solution Approach 1:
The patent optimizes the resistance parameter of detection wires by positioning them at specific distances from the circuit board and assigning appropriate resistance values. This parameter optimization balances noise immunity and signal strength, allowing the system to achieve both noise rejection and adequate detection sensitivity without extreme resistance values that would compromise either requirement.
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
This configuration reduces noise interference, ensuring stable drive signals and improved signal integrity in the display device.
Implementation Method 1
Resistance values of the first detection wires decrease as a corresponding first detection electrode, among the first detection electrodes, is disposed further towards a center of the display panel
Data Source
AI summary
A display device includes a display panel, an input sensor, and a circuit board. The input sensor includes first detection electrodes arranged in a first direction, second detection electrodes arranged in a second direction, first detection wires respectively electrically connected to the first detection electrodes, and second detection wires respectively electrically connected to the second detection electrodes. Resistance values of the first detection wires decrease as a corresponding first detection electrode among the first detection electrodes is disposed closer to a center of the display panel. Resistance values of the second detection wires increase as a corresponding second detection electrode among the second detection electrodes moves away from the circuit board, and a difference between the resistance values of the second detection wires adjacent to each other increases as the corresponding second detection electrode moves away from the circuit board.