Display Sensor Array Routing for Reliable Touch Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Capacitive sensor devices in display devices experience significant capacitance differences due to specific types of protective films, leading to reliability issues in sensing touch inputs.
Innovation Solution
The display device incorporates a sensor array with a first and second sensor electrode group, where signal lines connected to these electrodes have varying capacitance and resistance values to compensate for non-uniform capacitances, ensuring accurate touch sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a protective film is applied to the sensor device, then the device is protected from environmental damage, but significant capacitance differences occur between sensor electrodes leading to reliability degradation
Solution Approach 1:
The patent applies local quality by configuring different signal line structures for different sensor electrode groups. Specifically, first signal lines connected to first sensor electrodes (adjacent to edges) have different capacitance and resistance characteristics compared to second signal lines connected to second sensor electrodes (spaced from edges). This localized differentiation compensates for the non-uniform capacitance effects introduced by the protective film, maintaining reliable touch sensing across all electrodes while the protective film remains in place.
2Reliability
If signal lines are configured with varying capacitance and resistance values, then capacitance uniformity is achieved across sensor electrodes, but device complexity increases
Solution Approach 1:
The patent implements local quality by creating distinct signal line configurations for different electrode positions. First signal lines have specific capacitance and resistance values optimized for edge-adjacent electrodes, while second signal lines have different values optimized for interior electrodes. This targeted approach achieves capacitance uniformity without requiring complete redesign of all signal lines, thus limiting the increase in device complexity to only the necessary differential configurations.
Solution Approach 2:
The patent applies parameter changes by deliberately adjusting the capacitance and resistance values of signal lines to compensate for positional variations in sensor electrodes. By changing these electrical parameters selectively for different signal line groups, the patent achieves uniform effective capacitance across all sensor electrodes, resolving the contradiction between reliability and complexity through controlled parameter variation.
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 design enhances the reliability of touch input detection by uniformizing capacitance, preventing malfunctions and improving the accuracy of touch sensing.
Implementation Method 1
Capacitive methods have been used in such sensor devices. However, when the sensor devices include specific types of protective film, significant capacitance differences may occur between a corresponding sensor electrode and surrounding sensor electrodes
Data Source
AI summary
A display device may include a display panel, a sensor array including first and second sensor electrode groups, first and second signal lines respectively connected to the sensor electrodes of the first and second sensor electrode groups, and a sensor driver connected to the sensor array through the first and second signal lines. The sensor electrodes of the first sensor electrode group may include a first sensor electrode adjacent to an edge of the sensor array, and a second sensor electrode spaced apart from the edge. A signal line connected to the first sensor electrode among the first signal lines may include first and second routing lines connected to first and second ends of the first sensor electrode. A signal line connected to the second sensor electrode among the first signal lines may include a third routing line connected to a first end of the second sensor electrode.