Curved Display Sensor Electrode Layout for Lower Parasitic Capacitance
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Solution Overview
Problem
There is a need for display devices with enhanced touch detection performance, particularly in touch panels integrated with display devices, to improve detection capabilities.
Innovation Solution
The display device incorporates a substrate with a curved shape featuring detection electrodes of different shapes and detection lines that extend across the peripheral region to overlap with these electrodes, reducing parasitic capacitance and enhancing detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection lines are extended across the peripheral region to overlap with detection electrodes, then detection performance is improved, but parasitic capacitance increases
Solution Approach 1:
The detection lines are divided into multiple segments: a first portion within the display region, a second portion extending through the peripheral region, and a third portion overlapping with the detection electrode. This segmentation allows the line to achieve sufficient length for low impedance while controlling parasitic capacitance through strategic placement of each segment in regions with different capacitance characteristics.
Solution Approach 2:
The detection line routing transitions from a two-dimensional planar layout to a three-dimensional spatial arrangement by extending the line through the peripheral region and creating overlapping portions with detection electrodes at different positions, effectively utilizing the substrate's depth and lateral space to optimize electrical characteristics.
2Adaptability or versatility
If detection electrodes are arranged in row-column configuration, then touch detection capability is improved, but device complexity increases
Solution Approach 1:
The detection electrodes serve multiple functions: they act as both detection elements for touch input and as part of the display structure. The row-column configuration allows the same electrode array to support both X and Y axis detection, eliminating the need for separate detection systems and reducing overall device complexity despite the sophisticated detection capability.
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 enhances detection performance by minimizing parasitic capacitance and improving touch detection accuracy and reliability.
Implementation Method 1
touch detection is performed according to change in capacitance in the detection electrodes
Implementation Method 2
reducing parasitic capacitance and enhancing detection performance
Data Source
AI summary
According to an aspect, a display device with a sensor includes: a substrate including a display region and a peripheral region on a periphery of the display region; detection electrodes arranged in a row-column configuration in the display region; and detection lines coupled to the respective detection electrodes. A shape of the substrate in a plan view includes a curve of a curved portion. The detection electrodes include a first electrode and a second electrode having a shape different from that of the first electrode in a plan view. The second electrode is juxtaposed with the curved portion. The detection lines each include a first line coupled to the first electrode and a second line coupled to the second electrode. The second line passes from the display region across the peripheral region and extends to a position overlapping with the second electrode in a plan view.