Haptic Display Front Glass Motion for Compact Dashboard Integration
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Solution Overview
Problem
The challenge of integrating haptic feedback displays into vehicle dashboards is constrained by limited space, requiring multiple large mechanical actuators to achieve minimum displacement and acceleration, which is inefficient and costly.
Innovation Solution
A display device with a movable front glass and modulator system, utilizing a mechanical actuator to move only part of the display relative to the backlighting device, reducing the mass to be vibrated and allowing smaller or fewer actuators to provide effective haptic feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple large mechanical actuators are used to achieve haptic feedback, then the minimum displacement and acceleration constraints are satisfied, but the device volume and mass increase significantly
Solution Approach 1:
The display device is segmented into two separate assemblies: a first assembly containing the front glass and modulator, and a second assembly containing the backlighting device. The mechanical actuator moves only the first assembly relative to the second assembly, rather than moving the entire display device. This segmentation allows the haptic feedback to be achieved with a smaller actuator that moves a reduced mass, thereby satisfying the minimum displacement and acceleration constraints while reducing the overall device volume and actuator size requirements.
2Reliability
If multiple large mechanical actuators are used to achieve haptic feedback, then the acceleration and displacement constraints are met, but the manufacturing cost increases
Solution Approach 1:
By segmenting the display device into movable and stationary assemblies, the invention reduces the mass that needs to be accelerated for haptic feedback. This allows the use of fewer and smaller mechanical actuators, directly reducing component costs and assembly complexity, thereby lowering manufacturing costs while maintaining haptic feedback performance.
Solution Approach 2:
Instead of moving the entire display device mass, the invention applies partial action by moving only the front glass and modulator assembly. This partial movement is sufficient to generate the required haptic feedback effect at the user's finger contact point, avoiding the excessive action of moving the complete display assembly and thereby reducing actuator requirements and manufacturing costs.
3Reliability
If the entire display device is moved for haptic feedback, then the haptic effect is achieved, but the mass to be vibrated is too large for compact integration
Solution Approach 1:
The display device is divided into a movable assembly (front glass and modulator) and a stationary assembly (backlighting device). Only the movable assembly with lower mass is accelerated by the mechanical actuator to produce haptic feedback. This segmentation dramatically reduces the mass to be vibrated compared to moving the entire display device, enabling compact integration while maintaining effective haptic feedback.
Solution Approach 2:
The invention uses partial action by moving only the necessary components (front glass and modulator) rather than the entire display device. This partial movement provides sufficient haptic feedback at the user interface while minimizing the mass to be accelerated, enabling the system to meet haptic performance requirements with smaller actuators suitable for compact vehicle dashboard integration.
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 design enables compact integration of haptic feedback displays in small spaces while maintaining haptic performance, reducing the number of actuators needed and lowering manufacturing costs.
Implementation Method 1
said mechanical actuator is a piezoelectric actuator
Implementation Method 2
at least one spring, in contact by a first end with said backlighting device and by a second end with said second connecting element, so as to pre-stress said mechanical actuator and/or to return said front glass to an equilibrium position
Implementation Method 3
said flexible element is arranged so as to remain in an elastic deformation regime when said front glass undergoes an acceleration of at least 6 G and a displacement of at least 100 micrometers relative to said structure
Implementation Method 4
at least one sensor is arranged between said facade glass and said structure, and is designed to measure a force exerted on said facade glass
Data Source
Figure 1~3
Figure 4
AI summary
The invention relates to a display device (1) comprising: - a cover glass (10); - a back-lighting device (20), which is designed to generate a source light beam; - a modulator (12), which is securely fastened to the cover glass and located between said cover glass and the back-lighting device so as to receive the source light beam and to transmit a modulated light beam through the cover glass; and - at least one mechanical actuator (30); according to the invention, said mechanical actuator is placed so as to be able to move the cover glass with respect to the back-lighting device.