Integrated Touch and Photodetection Substrate for Display Devices
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Solution Overview
Problem
Current display devices face challenges in efficiently integrating touch sensing and photodetection capabilities while maintaining image display functionality, often requiring separate components and complex integration processes.
Innovation Solution
A display device configuration that includes a first substrate with switching elements, organic insulating layers, connection electrodes, pixel electrodes, and photoelectric conversion elements, along with an integrated circuit for touch and photodetection control, allowing for simultaneous image display, touch sensing, and photodetection in a time-sharing manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate components are used for touch sensing and photodetection, then functional reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines touch sensing electrodes and photodetection electrodes into a single integrated substrate structure. The touch sensing electrode and photodetection electrode are formed on the same substrate, sharing common structural elements such as the insulating layers and connection electrodes, thereby reducing device complexity while maintaining functional reliability through integrated design
Solution Approach 2:
The substrate structure is designed to perform multiple functions simultaneously - it serves as both the touch sensing component and the photodetection component. The electrode and insulating layer configuration enables the same structural elements to fulfill both touch sensing and light detection purposes, reducing the need for separate dedicated components
2Measurement precision
If multiple integrated circuits are used for touch and photodetection control, then control precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent integrates the control functions for both touch sensing and photodetection into a single integrated circuit. The control circuit is configured to selectively control either the touch sensing electrode or the photodetection electrode, eliminating the need for separate dedicated control circuits and reducing manufacturing cost while maintaining control precision through unified management
3Measurement precision
If separate detection processes are used for touch and photodetection, then detection accuracy is improved, but detection time increases
Solution Approach 1:
The control circuit implements time-division multiplexing, selectively controlling the touch sensing electrode and photodetection electrode at different time intervals. During specific detection periods, one function is activated while the other is inactive, allowing both touch sensing and photodetection to operate with high accuracy without continuous interference, while reducing total detection time through efficient periodic operation
Solution Approach 2:
The system dynamically switches between touch sensing mode and photodetection mode based on operational requirements. The control circuit can flexibly allocate detection resources and adjust the active function in real-time, optimizing detection accuracy for each mode while minimizing the time spent switching and reducing overall detection cycle time
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 enables the display device to specify object positions, emit light, and detect reflections efficiently, reducing the number of integrated circuits needed and shortening detection periods by integrating touch and photodetection functions within the display panel.
Implementation Method 1
a photoelectric conversion element located between the first organic insulating layer and the second organic insulating layer and electrically connected to the second switching element
Data Source
AI summary
According to one embodiment, a display device includes a first substrate and a second substrate. The first substrate includes a first switching element, a second switching element, a first organic insulating layer, a second organic insulating layer, a third organic insulating layer, a first connection electrode electrically connected to the first switching element, a second connection electrode electrically connected to the first connection electrode, a pixel electrode electrically connected to the second connection electrode, and a photoelectric conversion element electrically connected to the second switching element.