Integrated OLED Touch Sensor Sealing Structure for Thin Displays
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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 projection touch sensor within 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, while maintaining a thin profile.
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 the display device gains touch input capability, but the device thickness increases
Solution Approach 1:
The patent merges the touch sensor functionality with the existing counter substrate structure by forming detection electrodes directly on the inner surface of the counter substrate. This integration eliminates the need for a separate touch panel layer, thereby adding touch input capability while avoiding increased device thickness.
Solution Approach 2:
The counter substrate is designed to serve dual functions: as a structural component of the display device and as a carrier for touch sensor detection electrodes. This multi-functionality allows the same component to provide both mechanical support and touch sensing capability, resolving the contradiction between functionality and thickness.
2Length of moving object
If detection electrodes are formed on the inner surface of the counter substrate, then the touch sensor integration is achieved without increasing thickness, but the detection sensitivity may be compromised
Solution Approach 1:
The patent applies local quality by forming detection electrodes with specific patterns and properties in specific locations on the counter substrate inner surface. The electrodes are designed with appropriate dimensions, spacing, and conductive material properties to optimize detection sensitivity at the touch interface while maintaining overall device thinness.
Solution Approach 2:
The patent introduces an intermediary layer or structure between the detection electrodes and the touch surface to enhance detection sensitivity. This intermediary element mediates the interaction between the touch input and the detection electrodes, improving measurement precision without requiring additional thickness.
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 display device with enhanced detection sensitivity and reduced thickness by integrating the touch sensor functionality without increasing the overall device thickness.
Implementation Method 1
a capacitance type projection touch sensor... detection means for detecting a formation position of a capacitance formed between the first and second detection electrodes 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.