Key Display Assembly Segmented Lens Tactile Feedback
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Solution Overview
Problem
Aesthetic improvements in electronic mobile devices, such as continuous lens structures overlying display modules and keys, lead to key falsing issues due to the smooth appearance, where adjacent keys are inadvertently deflected, and touch-sensitive inputs lack tactile feedback.
Innovation Solution
A key/display assembly with mechanical switches positioned on opposite sides of a trackpad and a capacitive touch-sensitive input panel above a compressible gasket, providing distinct touch-sensitive regions for each key and tactile feedback through mechanical switches, while maintaining a continuous and aesthetically pleasing external appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a continuous lens structure is used to overlay display module and keys, then aesthetic appearance is improved, but key falsing occurs due to inadvertent deflection of adjacent keys
Solution Approach 1:
The lens structure is segmented into separate regions: a display lens portion overlaying the display module and key lens portions overlaying individual keys. These segments are positioned adjacent to each other but are distinct components, allowing independent deflection characteristics for each key while maintaining overall aesthetic continuity.
Solution Approach 2:
Different regions of the lens structure have different mechanical properties. The key lens portions are designed with specific thickness and flexibility to allow controlled deflection only at key locations, while the display lens portion maintains structural integrity. This local differentiation prevents inadvertent deflection propagation between adjacent keys.
2Ease of operation
If mechanical switches are used beneath the lens, then tactile feedback is provided, but key falsing is prone to occur due to continuous lens structure
Solution Approach 1:
Mechanical switches are positioned beneath individual key regions rather than continuously across the display. Each key has its own dedicated switch mechanism, allowing tactile feedback to be generated only at specific key locations without causing inadvertent activation of adjacent keys.
Solution Approach 2:
A compressible gasket is introduced as an intermediary layer between the lens structure and the mechanical switches. This gasket provides isolation and cushioning, ensuring that deflection force is transmitted only to the directly pressed key's switch and not propagated to adjacent switches, thereby preventing falsing while maintaining tactile feedback.
3Reliability
If slits or breaks are provided between adjacent keys, then key falsing is prevented, but aesthetic appeal is reduced
Solution Approach 1:
The lens is segmented into separate key lens portions and display lens portion that are positioned adjacent to each other without requiring visible slits or breaks. The segmentation itself provides the functional separation needed to prevent falsing while the segments are designed to create a visually continuous appearance when assembled.
Solution Approach 2:
Multiple identical key lens portions are used for different keys, each with the same design and dimensions. This standardization allows for consistent aesthetic appearance across all keys while maintaining the functional separation needed to prevent inadvertent deflection between adjacent keys.
4Reliability
If touch-sensitive input device is used instead of mechanical switches, then key falsing is prevented, but tactile feedback is not provided
Solution Approach 1:
The solution merges both mechanical and capacitive technologies: mechanical switches are retained beneath the lens to provide tactile feedback, while capacitive sensors are integrated to detect key presses and distinguish between adjacent keys. This combination allows the system to benefit from both tactile feedback and accurate key identification without the drawbacks of either technology alone.
Solution Approach 2:
A compressible gasket serves as an intermediary that transmits mechanical force from the lens to the mechanical switches while isolating adjacent key regions. This allows mechanical switches to provide tactile feedback without causing falsing, and works in conjunction with capacitive sensors to accurately distinguish which key is being pressed.
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
Prevents key falsing by accurately determining which key is pressed and provides tactile feedback, enhancing user interaction without compromising the device's appearance.
Implementation Method 1
A key/display assembly includes a first switch and a display module disposed aside the first switch. A capacitive touch-sensitive input panel overlies the first switch and the display module
Implementation Method 2
A key/display assembly with mechanical switches positioned on opposite sides of a trackpad and a capacitive touch-sensitive input panel above a compressible gasket, providing distinct touch-sensitive regions for each key and tactile feedback through mechanical switches
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A key/display assembly (110) includes a first switch (218A) and a display module (214) disposed aside the first switch (218A). A touch-sensitive input panel (222) overlies the first switch (218A) and the display module (214), and the touch-sensitive input panel (222) includes a first touch-sensitive region (224A) proximate the first switch (218A). The electronic mobile device further includes a first key (120A) defined by the first switch (218A) and the first touch-sensitive region (224A). As such, the first key (120A) is actuated by pressing the first touch-sensitive region (224A) to displace the first touch-sensitive region (224A) and thereby actuate the first switch (218A).