Peripheral Electrode Layout for Thin Capacitive Display Sensing
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Solution Overview
Problem
Existing display devices face challenges in improving the operability of sensors located outside the display area, as they often require additional components and increased thickness, leading to a separation between the display area and sensor area, which affects detection sensitivity and accuracy.
Innovation Solution
The implementation of a display device structure with first and second electrodes in the peripheral area, where the first electrode has a portion opposed to the second electrode and another portion not opposed, with an adhesive layer in between, enhancing capacitance detection sensitivity and reducing the thickness by integrating the sensor unit within the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensors are provided outside the display area, then detection function is added, but detection sensitivity and accuracy deteriorate due to separation from display area
Solution Approach 1:
The patent merges the sensor unit with the display device by integrating the first electrode (on first substrate) and second electrode (on display panel) within the same device structure. This integration allows the sensor to detect operations both in the display area and in peripheral areas outside the display area, maintaining high detection sensitivity while adding detection versatility.
2Reliability
If additional components are added for sensor functionality, then detection capability is improved, but device thickness increases
Solution Approach 1:
The patent implements a nested structure where the sensor unit is embedded within the display device. The first electrode is formed on the first substrate, the second electrode is formed on the display panel, and an adhesive layer is arranged between them. This nested arrangement integrates multiple functions (display and sensing) within the same thickness profile, avoiding additional thickness from separate sensor components.
3Length of moving object
If sensor unit is integrated within display device, then thickness is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the electrode structure into distinct components: first electrode on first substrate, second electrode on display panel, and adhesive layer between them. This segmentation allows each component to be manufactured and positioned independently, then assembled together. The first electrode includes a first portion opposed to the second electrode and a second portion not opposed, enabling flexible manufacturing approaches while maintaining integration benefits.
4Measurement precision
If first electrode has portions both opposed and not opposed to second electrode, then detection accuracy is improved, but structural complexity increases
Solution Approach 1:
The patent applies local quality by creating different portions of the first electrode with different spatial relationships to the second electrode. The first portion is opposed to the second electrode for primary capacitance detection, while the second portion is not opposed, providing additional detection capability and preventing erroneous detections. Each portion is optimized for its specific function, improving overall detection accuracy without requiring complex additional components.
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 improves the detection sensitivity and accuracy of sensor operations while reducing the thickness and component count, preventing erroneous detections and enhancing overall operability of the display device.
Implementation Method 1
enhancing capacitance detection sensitivity
Data Source
AI summary
According to one embodiment, a display device includes a display panel having a display area, a first substrate opposed to the display panel, an adhesive layer arranged between the display panel and the first substrate, a first electrode formed at the first substrate in a peripheral area arranged along at least a part of an outer edge of the display area, a second electrode formed at the display panel in the peripheral area. In the display device, the first electrode includes a first portion which is opposed to the second electrode and a second portion which is not opposed to the second electrode, and the adhesive layer is interposed between the first portion and the second electrode.