Semiconductor Device with Integrated Organic EL Touch Sensing
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Solution Overview
Problem
Existing display devices with integrated touch sensors are thick due to the addition of a separate touch panel or touch sensor function in the counter substrate, which contradicts the demand for thinner electronic devices.
Innovation Solution
Incorporating a capacitance type touch sensor directly into the display device by using first and second detection electrodes extending in different directions, formed on inorganic sealing films, and a touch sensor control unit to detect electric changes for touch input, without increasing the device thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch panel or touch sensor function is added to the counter substrate, then touch sensor functionality is achieved, but the device thickness increases
Solution Approach 1:
The patent merges the touch sensor function with the counter substrate by forming detection electrodes directly on the counter substrate surface. This integration eliminates the need for a separate touch panel layer, thereby achieving touch sensor functionality without increasing device thickness. The detection electrodes are formed as part of the counter substrate structure, combining multiple functions into a single integrated component.
2Adaptability or versatility
If detection electrodes are formed on the counter substrate, then touch detection capability is achieved, but the counter substrate structure becomes more complex
Solution Approach 1:
The counter substrate is designed to serve multiple functions: it acts as both the structural counter electrode support and the touch sensor detection layer. By forming detection electrodes directly on the counter substrate, the substrate becomes a multi-functional component that performs both display and touch sensing functions, reducing overall device complexity despite the added 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
The solution results in a thinner organic electroluminescent device with enhanced detection sensitivity and reduced thickness, while maintaining the functionality of a touch sensor.
Implementation Method 1
a capacitance type touch sensor which has a first detection electrode that extends in one direction, and a second detection electrode that extends in another direction, both in parallel toward the second substrate, a dielectric film that is laminated on the second detection electrode; and detection means for detecting an electric change generated in the other detection electrode through the dielectric film
Data Source
AI summary
An organic electroluminescent device with a touch sensor including: a first substrate; a second substrate arranged opposite to the first substrate; an organic EL element layer arranged above the first substrate; a first sealing film arranged toward the second substrate of the organic EL element layer, covering the organic EL element layer, and including a first inorganic layer; plural first detection electrodes extending in one direction, and arranged in parallel toward the second substrate of the first sealing film; a second sealing film arranged toward the second substrate of the first detection electrodes, and including a second inorganic layer; plural second detection electrodes extending in another direction different from the one direction, and arranged in parallel toward the second substrate of the second sealing film; and a touch sensor control unit controlling a potential to detect a touch with a display surface.