Transparent Semiconductor Thin Film for Flexible Haptic Touch Screens
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Solution Overview
Problem
Existing electrosensory haptic touch screens integrated with capacitive touch screens face issues with optimal operation, flexibility, and durability, leading to suboptimal performance and high replacement costs, especially when applied to pliable or bendable screens.
Innovation Solution
A functional thin film with a transparent semiconductor layer and insulating protective film, featuring a surface resistance of 10 MΩ/□ to 100 MΩ/□, is developed, allowing for optimal capacitive touch screen operation and flexibility, using a sputtering or chemical vapor deposition method with n-type doping and an anti-fingerprint film for improved transparency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semiconductor layer and insulating layer are stacked to form an electrosensory haptic touch screen, then haptic feedback function is achieved, but the touch screen cannot operate in optimal conditions and transparency is compromised
Solution Approach 1:
The patent adjusts the surface resistance of the transparent semiconductor layer to a specific range (10-100 MΩ/□) to optimize both transparency and haptic feedback performance. By controlling doping concentration and film thickness parameters, the invention achieves optimal electrical properties while maintaining high visible light transparency, resolving the contradiction between functional performance and optical clarity.
Solution Approach 2:
The invention uses a composite structure consisting of a transparent semiconductor layer (such as ITO or ZnO-based materials) combined with an insulating protective film. This composite material approach allows the system to simultaneously achieve electrical functionality for haptic feedback and optical transparency, as the transparent semiconductor provides both electrical conductivity and light transmission, while the insulating layer adds protective functionality.
2Adaptability or versatility
If the electrosensory haptic touch screen is integrated with the capacitive touch screen, then a complete touch screen system is formed, but replacement cost increases when malfunction occurs
Solution Approach 1:
The patent separates the electrosensory haptic touch screen into a distinct, independently replaceable module that can be detached from the capacitive touch screen. This segmentation allows the haptic feedback layer to be replaced separately from the display layer, reducing replacement costs and simplifying repair processes while maintaining full system functionality.
Solution Approach 2:
The invention extracts the electrosensory haptic touch screen as a separate functional layer that can be removed and replaced independently. By taking out the haptic feedback component from the integrated system, the patent enables selective replacement of only the malfunctioning haptic layer without replacing the entire touch screen assembly, thereby reducing repair costs.
3Ease of operation
If the electrosensory haptic touch screen is touched by a user, then touch input is detected, but electric charges accumulate on the insulating layer causing function deterioration
Solution Approach 1:
The patent incorporates an anti-fingerprint film with conductive properties that automatically dissipates accumulated electric charges on the insulating layer. This self-service mechanism continuously neutralizes charge buildup during normal touch operation, preventing function deterioration without requiring external intervention or additional complex systems.
Solution Approach 2:
The anti-fingerprint film acts as an intermediary layer between the user's finger and the insulating protective film. This intermediary conductive layer provides a charge dissipation pathway, allowing touch input detection to proceed normally while preventing charge accumulation on the insulating layer that would otherwise deteriorate screen function.
4Reliability
If a rigid semiconductor layer is used for electrosensory haptic touch screen, then electrical function is achieved, but application to pliable or bendable touch screens becomes impossible
Solution Approach 1:
The patent employs thin-film deposition techniques to create flexible transparent semiconductor layers that can be applied to pliable or bendable substrates. By using advanced thin-film fabrication methods, the invention achieves the necessary flexibility for bendable touch screens while maintaining the electrical functionality required for haptic feedback, thus enabling application to both rigid and flexible displays.
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 enables transparent and flexible electrosensory haptic screens that can be operated in optimal conditions on various touch screens, including pliable or bendable ones, with enhanced durability and reduced replacement costs, as the thin film can be separately manufactured and replaced.
Implementation Method 1
forming a transparent semiconductor layer on a substrate by a sputtering method or a chemical vapor deposition method
Implementation Method 2
forming a transparent semiconductor layer on a substrate by a sputtering method or a chemical vapor deposition method
Implementation Method 3
adjusting a surface resistance of the transparent semiconductor layer by performing a n-type doping process on the transparent semiconductor layer
Data Source
AI summary
Provided is a functional thin film forming method comprising: (a) forming a transparent semiconductor layer on a substrate; (b) adjusting a surface resistance of the transparent semiconductor layer by performing a n-type doping process on the transparent semiconductor layer formed in the step (a); and (c) forming an insulating protective film of SiOx on the transparent semiconductor layer of which the surface resistance is adjusted in the step (b), wherein the surface resistance of the transparent semiconductor layer is in a range of from 10 MΩ/□ to 100 MΩ/□.