Rollable Touch Screen Display With Integrated Drive-Sense Circuits
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Solution Overview
Problem
Existing touch screen technologies face challenges in effectively sensing touches on flexible and foldable displays, particularly in rollable configurations, due to the complexity of deformation states and the need for efficient power management.
Innovation Solution
The implementation of a rollable touch screen display with integrated drive-sense circuits and a touch screen processing module that can dynamically adjust touch resolution and enable/disable touch areas based on the display's folding or rolling state, utilizing self-capacitance and mutual capacitance sensing principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rollable touch screen display is used to enable flexible deformation states, then adaptability and versatility are improved, but device complexity increases due to the need for integrated drive-sense circuits and processing modules
Solution Approach 1:
The patent combines drive circuits and sense circuits into integrated drive-sense circuits that are directly coupled to the display elements. This merging eliminates the need for separate drive and sense circuit modules, reducing overall device complexity while maintaining the ability to handle multiple deformation states of the rollable display.
Solution Approach 2:
The integrated drive-sense circuits are designed to perform multiple functions: driving display elements in different deformation states (rolled, partially unrolled, fully unrolled) and sensing touch inputs across the same display areas. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity while improving adaptability.
2Ease of operation
If touch sensing is enabled across the entire rollable display area, then ease of operation is improved, but power consumption increases
Solution Approach 1:
The rollable display is divided into multiple display elements that can be independently controlled. The touch sensing capability is segmented across these elements, allowing the system to enable touch sensing only in the currently visible or active display areas rather than the entire rollable surface, thereby reducing power consumption while maintaining ease of operation.
Solution Approach 2:
The system dynamically adjusts touch sensing activation based on the current deformation state of the rollable display. When the display is rolled or partially unrolled, touch sensing is enabled only in the visible portions. When fully unrolled, touch sensing can be enabled across the entire area. This dynamic adaptation optimizes power consumption while maintaining ease of operation.
3Measurement precision
If high touch resolution is maintained across all display elements, then measurement precision is improved, but power consumption and processing load increase
Solution Approach 1:
The display is segmented into multiple independently controllable elements, each with its own touch sensing capability. The system can adjust the touch resolution and sensing activation on a per-element basis, enabling high measurement precision only in the currently visible or actively used display areas, thereby reducing overall power consumption and processing load.
Solution Approach 2:
Different display elements can have different touch sensing configurations optimized for their specific usage context. Elements in the visible area can maintain high touch resolution, while elements in hidden or less critical areas can have reduced or disabled touch sensing, achieving local optimization of measurement precision while managing power consumption.
4Volume of moving object
If the display is rolled to a compact state, then volume of moving object is reduced, but touch sensing accuracy may deteriorate due to deformation
Solution Approach 1:
The system dynamically adapts touch sensing operation based on the display's deformation state. When rolled, the system adjusts sensing parameters and activates only elements in the visible/unrolled portions, maintaining measurement precision in those areas while accommodating the compact volume state. The drive-sense circuits are designed to compensate for deformation effects.
Solution Approach 2:
The patent replaces traditional mechanical touch sensing mechanisms with capacitive sensing based on self-capacitance and mutual capacitance measurements. This electronic sensing approach is less sensitive to mechanical deformation and maintains measurement precision across different display states, including rolled and unrolled configurations.
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 solution enables accurate touch sensing and efficient power management on rollable touch screen displays, allowing for seamless operation across various deformation states without compromising image quality or battery life.
Implementation Method 1
utilizing self-capacitance and mutual capacitance sensing principles
Implementation Method 2
utilizing self-capacitance and mutual capacitance sensing principles
Data Source
AI summary
A device having a touch screen display with at least a first touch area and a second touch area, the second touch area rollable between an extended position and a closed position. A first plurality of column electrodes are integrated into the first touch area of the touch screen display, a second plurality of column electrodes are integrated into the second touch area of the touch screen display, and a plurality of row electrodes are integrated into and extend across the first touch area and the second touch area. The device further includes a plurality of drive-sense circuits that drive sensor signals on the electrodes. A processing module senses, based on the sensor signals, an electrical characteristic of at least one row electrode and at least one column electrode of the first plurality of column electrodes or the second plurality of column electrodes to determine proximal touches.