Touch Panel Coverglass Segmentation for Haptic Feedback and Reflection Reduction
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Solution Overview
Problem
Conventional touch panel systems face issues with high energy consumption and increased costs due to the need to accelerate the mass of the display and coverglass, resulting in unwanted noise and mechanical stress.
Innovation Solution
A touch panel system where the coverglass is moved independently of the display unit to provide haptic feedback, using actuators coupled only to the coverglass or a static structure, reducing the need to accelerate the display and backlight masses, and incorporating anti-reflective coatings to minimize reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If actuators move the complete unit including display module and backlight unit for haptic feedback, then haptic feedback is provided to the user, but energy consumption increases and acoustic noise is emitted due to accelerated mass
Solution Approach 1:
The system is divided into two independent parts: the display unit (display module + backlight unit) remains stationary, while only the coverglass with integrated actuator moves to provide haptic feedback. This segmentation eliminates the need to accelerate the heavy display and backlight masses, significantly reducing energy consumption while maintaining effective haptic feedback through coverglass vibration.
2Reliability
If actuators move the complete unit including display module and backlight unit for haptic feedback, then haptic feedback is provided to the user, but acoustic noise is emitted due to accelerated mass
Solution Approach 1:
By separating the coverglass actuation system from the display unit, the invention eliminates acoustic noise generated by accelerating the heavy display module and backlight unit. Only the lightweight coverglass vibrates to produce haptic feedback, significantly reducing unwanted acoustic emissions while maintaining feedback effectiveness.
3Reliability
If actuators move the complete unit including display module and backlight unit for haptic feedback, then haptic feedback is provided to the user, but mechanical stress increases due to accelerated mass
Solution Approach 1:
The invention separates the actuator system from the heavy display unit, attaching actuators only to the coverglass. This eliminates mechanical stress on the display module and backlight unit that would result from accelerating their large masses. The lightweight coverglass can be vibrated with minimal mechanical stress while still providing effective haptic feedback.
4Ease of manufacture
If standard coverglass surface is used, then manufacturing is simple, but reflection increases reducing readability under sunny conditions
Solution Approach 1:
The invention modifies the optical parameters of the coverglass surface by applying anti-reflective coatings or creating microstructured surfaces. These changes reduce light reflection and improve readability under sunny conditions while maintaining manufacturing feasibility through established coating and texturing processes.
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 approach reduces energy consumption, acoustic noise, and mechanical stress, while lowering system costs and improving readability under sunny conditions by providing efficient haptic feedback with reduced reflection.
Implementation Method 1
incorporating anti-reflective coatings to minimize reflection
Data Source
AI summary
A touch panel system is provided, which comprises a display unit, a touch sensor structure and a coverglass. A user touches the coverglass during touch input to the touch sensor structure, and the coverglass is configured to be moved relative to the display unit for providing haptical feedback to the user. Therein, the coverglass is mounted in a predetermined distance d from the display unit such that the coverglass and the display unit are decoupled from each other by an empty space to define opposite internal surfaces, which are coated with an anti-reflecting coating such as a moth eye film.