Rollable Display Touch Sensitivity Compensation for Bending Stability
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Solution Overview
Problem
Rollable electronic devices face issues with touch usability due to changes in touch sensitivity caused by bending or lifting of the display in its expanded state, leading to interlayer separation and capacitance value changes.
Innovation Solution
A method and a rollable electronic device that detect the sensitivity of the touch panel associated with bending or lifting of the display in an expanded state and correct the sensitivity by adjusting the rolling direction, extension length, and resistance of the expansion area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display is expanded to provide a larger screen area, then the screen output capability is improved, but the touch sensitivity becomes unstable due to bending or lifting of the display
Solution Approach 1:
The patent implements a feedback mechanism where the control circuit continuously monitors the capacitance value of the touch panel through the sensing circuit. When bending or lifting causes capacitance changes, the system detects these changes and adjusts the touch sensitivity accordingly, creating a closed-loop control system that maintains stable touch performance despite display deformation.
Solution Approach 2:
The patent changes the electrical parameters of the touch panel by adjusting capacitance values based on detected bending or lifting conditions. The control circuit modifies touch sensitivity parameters dynamically, transforming the touch panel's electrical characteristics to compensate for physical deformation and maintain consistent touch response.
2Adaptability or versatility
If the display is rolled to change expanded or contracted length, then the display area is adjusted, but interlayer separation occurs causing touch input malfunction
Solution Approach 1:
The patent performs preliminary detection of bending or lifting conditions before touch input occurs. The sensing circuit proactively monitors capacitance changes, and the control circuit preemptively adjusts touch sensitivity parameters to prevent touch malfunction, rather than reacting after the problem occurs.
Solution Approach 2:
The system uses feedback from the sensing circuit to continuously monitor the physical state of the display during rolling operations. Based on this feedback, the control circuit dynamically adjusts touch panel parameters to maintain reliable touch input functionality throughout the expansion and contraction cycle.
3Length of moving object
If the rear surface of the display is not supported in expanded state, then the display can be fully extended, but bending or lifting phenomenon occurs causing capacitance value changes
Solution Approach 1:
The patent replaces mechanical support structures with an electrical compensation system. Instead of physically supporting the rear surface to prevent bending, the system uses electrical field adjustments through capacitance monitoring and sensitivity compensation to maintain touch performance despite mechanical deformation.
Solution Approach 2:
The control circuit dynamically changes the electrical parameters of the touch panel by adjusting capacitance values and sensitivity settings in response to detected bending or lifting, thereby maintaining stable touch recognition despite changes in the physical support condition.
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 effectively improves touch usability by compensating for changes in touch sensitivity, preventing touch malfunctions, and maintaining reliable touch input functionality even during physical vibrations and expansions/contractions of the display.
Implementation Method 1
at least one strain gauge sensor disposed on the first insulating layer... It is detected whether a resistance of an expansion area of the rollable display is changed
Implementation Method 2
an interlayer separation phenomenon may occur between at least one portion (e.g., a conductive layer) of a touch panel and another portion (e.g., an insulating layer) implemented in the display in order to implement a touch input. Accordingly, a change in capacitance value of the touch panel may occur
Data Source
AI summary
A method and an electronic device are provided for compensating for changed touch sensitivity of a touch panel of the electronic device. It is detected whether a rollable display of the electronic device is expanded. It is detected whether the touch sensitivity of the touch panel of the rollable display is changed, in case that the rollable display is expanded. A rolling direction and a length of extension of the rollable display is changed, in case that the touch sensitivity is changed. It is detected whether a resistance of an expansion area of the rollable display is changed. The touch sensitivity of the touch panel is compensated for, in case that the resistance is changed.