Stretchable Display Touch Sensing Layout for Stable Accuracy
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Solution Overview
Problem
Stretchable display devices experience noise in touch sensors due to changes in capacitance when stretched, leading to decreased touch accuracy, increased thickness, and reduced transmittance, along with higher manufacturing costs and potential Moire patterns.
Innovation Solution
A stretchable display device design with rigid and soft portions, including a sensing portion with a sensing capacitor and sensing line, where the sensing portion is positioned between soft portions to maintain touch accuracy and reduce thickness and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is attached onto a display panel to enable touch function, then touch capability is improved, but noise occurs in the touch sensor due to capacitance change during stretching, leading to decreased touch accuracy
Solution Approach 1:
The patent applies parameter changes by modifying the capacitance characteristics of the touch sensor. Specifically, a compensation capacitor is introduced to counterbalance the capacitance changes that occur during stretching, thereby maintaining stable touch sensing performance and reducing noise in the touch signal.
Solution Approach 2:
The patent uses an intermediary approach by introducing a compensation capacitor as a mediator element. This compensation capacitor acts as an intermediary component that compensates for the unwanted capacitance variations caused by stretching, thus isolating the touch sensing function from the detrimental effects of mechanical deformation.
2Adaptability or versatility
If a touch panel is manufactured on a separate substrate and attached to the display panel, then touch function is achieved, but the thickness increases and manufacturing costs increase
Solution Approach 1:
The patent applies the merging principle by integrating the touch sensor directly into the display panel structure. Instead of using a separate touch panel substrate, the touch sensor is formed as part of the display panel layers, thereby reducing overall thickness and simplifying the device structure while maintaining touch functionality.
Solution Approach 2:
The patent implements multi-functionality by designing the display panel to serve dual purposes: both display function and touch sensing function. The same panel structure performs both functions, eliminating the need for a separate touch panel and reducing device complexity.
3Adaptability or versatility
If an additional panel is attached to the display panel to provide touch capability, then touch sensing is enabled, but transmittance decreases
Solution Approach 1:
The patent merges the touch sensor layers with the display panel layers, eliminating the need for an additional separate panel. This integration reduces the total number of layers and materials that light must pass through, thereby maintaining high transmittance while enabling touch sensing capability.
4Adaptability or versatility
If a touch panel is attached to the display panel, then touch capability is added, but Moire patterns may occur when emitting light, reducing visibility
Solution Approach 1:
The patent eliminates Moire patterns by merging the touch sensor structure with the display panel structure. This integration removes the separate panel interface that causes interference patterns, thereby maintaining visibility and eliminating Moire effects while preserving touch 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
Improves touch performance and accuracy, reduces thickness, and enhances transmittance while minimizing manufacturing costs and visibility issues.
Implementation Method 1
When the stretchable display device including the touch panel is stretched, a transmitter line and a receiver line constituting a touch sensor are stretched, and a distance therebetween is changed, resulting in a change in capacitance.
Data Source
AI summary
A stretchable display device includes a plurality of rigid portions spaced apart from each other in a first direction and a second direction transverse to the first direction. The stretchable display device includes a soft portion provided between adjacent rigid portions in the first direction or the second direction. The stretchable display device includes a sensing portion provided between adjacent soft portions in the first direction or the second direction. The stretchable display device includes a pixel provided in each of the plurality of rigid portions and including a plurality of sub-pixels. The stretchable display device includes a stretchable line provided in the soft portion and connecting adjacent pixels. The stretchable display device includes a sensing capacitor and a sensing line provided in the sensing portion.