Touch Tactile Display Electrode Segmentation for Signal Isolation
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Solution Overview
Problem
Capacitive touch screens fail to accurately sense touch due to the blocking effect of tactile electrodes on touch electrodes, preventing effective capacitance change detection and subsequent touch recognition.
Innovation Solution
A touch tactile display apparatus with drive and sensing electrodes spaced apart, forming capacitors, where a touch processor senses capacitance changes to determine touch coordinates and a tactile processor provides distinct signals to drive and sensing electrodes to enable touch sensing and electro-tactile feedback without interfering with the touch detection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If tactile electrodes are disposed on touch electrodes to provide electro-tactile feeling, then electro-tactile feedback capability is improved, but touch sensing accuracy deteriorates due to blocking effect
Solution Approach 1:
The patent segments the electrode functions by providing separate touch electrodes for sensing and separate tactile electrodes for feedback. The touch electrodes are disposed on the inner surface of the touch screen while tactile electrodes are provided on the outer surface, physically separating the sensing and feedback functions to eliminate the blocking effect while maintaining both capabilities.
Solution Approach 2:
The patent resolves the contradiction by transitioning from a single-layer electrode configuration to a multi-layer spatial arrangement. Touch electrodes are positioned on the inner surface of the touch screen while tactile electrodes are positioned on the outer surface, utilizing different spatial dimensions (inner vs. outer surfaces) to perform both functions simultaneously without interference.
2Adaptability or versatility
If separate touch electrodes and tactile electrodes are provided, then both touch sensing and electro-tactile feedback functions are achieved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by integrating both touch sensing and electro-tactile feedback capabilities into the same display device. The touch screen structure is designed to accommodate both touch electrodes for sensing input and tactile electrodes for providing feedback, allowing a single device to perform multiple functions without requiring separate systems.
Solution Approach 2:
The patent manages complexity by utilizing the third dimension (spatial arrangement) to accommodate multiple electrode types. By positioning touch electrodes on the inner surface and tactile electrodes on the outer surface of the touch screen, the design fits both functions within the existing device thickness without requiring additional lateral space or complex overlapping structures.
3Adaptability or versatility
If multiple electrodes and substrates are arranged in sequence, then electro-tactile feeling is provided, but device thickness increases
Solution Approach 1:
The patent utilizes the available thickness dimension efficiently by arranging touch electrodes on the inner surface and tactile electrodes on the outer surface of the touch screen. This spatial arrangement allows both electrode types to coexist within the existing display panel thickness without requiring additional sequential layers that would increase overall device 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
Enables accurate touch sensing and simultaneous electro-tactile feedback by separating the signals for touch detection and feedback, allowing for effective user interaction and enhanced user experience without adding separate electrodes, thus reducing thickness, weight, and cost.
Implementation Method 1
capacitors are formed between the sensing electrodes and each of their adjacent drive electrodes; a touch processor configured to sense an amount of change of capacitance of the capacitors to obtain a touch coordinate
Implementation Method 2
an electro-tactile technology, which provides an electro-tactile feeling to human skin by using an electric field, has been developed. The electro-tactile technology forms an electric field at a tangoreceptor located on the skin, so that a user senses a tactile feeling
Data Source
AI summary
A touch tactile display apparatus includes a display panel and a tactile touch portion. The tactile touch portion is configured to sense a touch by a user and provide an electro-tactile feeling to an area in which the touch is sensed. The tactile touch portion includes a first electrode, a touch processor and a tactile processor. The touch processor applies a first signal to the first electrode to extract a touch coordinate. The tactile processor applies a second signal different from the first signal to the first electrode to provide the electro-tactile feeling. The first signal and the second signal are applied at different times.