Electrostatic Feedback Display Array with Boundary Perceptible Haptic Safety
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Solution Overview
Problem
Traditional display panel haptic feedback technologies are not boundary perceptible and pose safety risks due to the need for high voltages, which can be hazardous if the protective film is damaged.
Innovation Solution
An electrostatic feedback display array is developed, comprising a substrate with an insulation layer, a passivation layer connected to an LED device, a dielectric layer with a second electrode, and inductive and driving TFT devices, which control electrostatic feedback and capacitance sensing to generate boundary perceptible haptic feedbacks while avoiding direct high voltage exposure to the human body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high voltage (greater than 100V) is used to produce large electrostatic force for haptic feedback, then the haptic feedback effect is improved, but the safety risk increases due to potential direct short to human body if protective film is damaged
Solution Approach 1:
The patent introduces an intermediary voltage transformation system consisting of a first TFT device (connected to high voltage source) and a second TFT device (connected to electrode). This intermediary structure transforms the high voltage signal through a low voltage control signal, ensuring that even if the protective film is damaged, the human body is not directly exposed to high voltage. The intermediary TFT devices act as safety buffers that maintain electrical isolation between the high voltage source and the user.
Solution Approach 2:
The patent changes the voltage parameter from direct high voltage application to a two-stage transformation process. The first TFT device converts high voltage to an intermediate state, and the second TFT device further transforms it to drive the electrode. This parameter transformation maintains the necessary electrostatic force while reducing the voltage level that could potentially contact the user, thereby resolving the safety contradiction.
2Force
If traditional linear motors are used for haptic feedback, then boundary-less vibration is achieved, but the device size becomes large and cannot be integrated in display panel
Solution Approach 1:
The patent replaces the traditional mechanical linear motor system with an electrostatic field-based system. Instead of using moving mechanical parts (coils, magnets, and arms), the invention uses electrostatic force generated by voltage-controlled TFT devices to actuate the haptic feedback electrode. This substitution eliminates the need for bulky mechanical components, enabling integration within the thin display panel structure while still producing effective vibration and tactile feedback.
Solution Approach 2:
The patent employs thin-film technology for the TFT devices and electrode structures, allowing the haptic feedback system to be integrated into the display panel without significantly increasing thickness. The thin-film TFT devices and flexible electrode design enable the system to maintain the display's slim profile while providing effective haptic feedback functionality.
3Ease of operation
If electrostatic friction modulation is used to realize regional feedbacks, then boundary-perceptible haptic feedbacks are achieved, but the voltage requirement (greater than 100V) creates safety concerns
Solution Approach 1:
The patent uses intermediary TFT devices to transform the high voltage required for electrostatic friction modulation into a safer voltage level. The first TFT device receives the high voltage signal and transforms it through a low voltage control signal, and the second TFT device further transforms it to drive the electrode. This intermediary transformation maintains the regional feedback capability while reducing the voltage exposure risk to users.
4Object-affected harmful factors
If TFT devices are used to control electrostatic feedback, then safety is improved by preventing direct high voltage connection, but the device complexity increases
Solution Approach 1:
The patent designs the TFT devices to perform multiple functions: they act as voltage transformation elements, safety isolation barriers, and haptic feedback actuators. The first TFT device transforms high voltage to intermediate voltage while providing safety isolation, and the second TFT device further transforms it to drive the electrode. This multi-functionality reduces the need for separate safety circuits and voltage transformation stages, thereby mitigating the increase in device complexity.
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 integrates electrostatic feedback, capacitance sensing, and display functions, enabling boundary perceptible haptic feedbacks while ensuring safety by preventing direct connection of high voltage to the human body, thus improving the safety of feedback triggering.
Implementation Method 1
inputting a high voltage level signal into a gate terminal of an inductive TFT device, and a high-frequency high voltage level signal to a drain terminal of the inductive TFT device when a finger touches a dielectric layer for a first time, where the high voltage level signal and the high-frequency high voltage level signal drives generation of static electricity between a second electrode and the finger
Implementation Method 2
a capacitor; wherein a source terminal of the inductive TFT device is connected to a gate terminal of the driving TFT device, one end of the capacitor is connected to the source terminal of the inductive TFT device, the other end of the capacitor is connected to a drain terminal of the driving TFT device
Data Source
AI summary
An electrostatic feedback display array, an active driving method, and a circuit. The array includes a substrate, an insulation layer on the substrate, a passivation layer on the insulation layer, a dielectric layer on the passivation layer, an inductive TFT and a driving TFT in the insulation layer. The passivation layer has an LED and electrically connects to a first electrode of the LED. The dielectric layer has a second electrode. The source of the inductive TFT electrically connects to the second electrode. The driving TFT has a source electrically connected to the first electrode device, and a gate electrically connected to a source of inductive TFT. The invention utilizes TFTs to control a touch electrostatic feedback switch, integrates electrostatic feedback, capacitance sensing and display functions, realizes boundary perceptible haptic feedbacks, avoids direct connection and harmful consequences of high voltage source to the human body, and improve safety.