Offset Selection Element Display for Touch Accuracy
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Solution Overview
Problem
Conventional touch-sensitive computing devices with small screens face challenges in accuracy due to limited screen real estate and finger size, particularly for users with thicker fingers, as selection elements are often obscured by the finger during interaction.
Innovation Solution
A system that uses camera and sensor-based detection to track a user's finger position and movement, allowing a selection element to be positioned offset from the finger, becoming fixed upon proximity to the screen for accurate selection, and adjusting based on user viewpoint and device orientation to prevent obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional touch interface is used with small screen elements, then the device can be compact and portable, but the selection accuracy deteriorates due to limited screen real estate and finger size
Solution Approach 1:
The patent introduces an optical intermediary system consisting of cameras and sensors that detect finger position and translate it to selection element position. This intermediary layer allows the finger to interact with the screen without direct contact, maintaining selection accuracy while preserving the compact device form factor. The optical field acts as a mediator between the physical finger and the digital interface elements.
2Ease of operation
If the selection element is positioned directly under the finger, then the interaction is simple, but the selection element becomes obscured and invisible to the user
Solution Approach 1:
The patent resolves the visibility conflict by moving the selection element from the same spatial plane as the finger to a different dimensional space. The selection element is rendered at a position offset from the finger's physical location, utilizing the optical detection field to map finger position to selection element position. This dimensional separation allows both the finger and selection element to be simultaneously visible, maintaining interaction simplicity while preventing obscuration.
3Loss of information
If the selection element is offset from the finger position, then the selection element remains visible, but the system complexity increases due to camera and sensor integration
Solution Approach 1:
The patent reduces system complexity by assigning multi-functionality to existing device components. The camera and sensor systems, which may already be present for other purposes (display, authentication, environmental sensing), are repurposed to detect finger position for selection element control. This universal usage of existing components minimizes the addition of dedicated hardware while achieving offset selection element visibility.
4Ease of operation
If the selection element responds to lateral finger movement, then the user can control it without touching the screen, but the accuracy of final selection may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where the selection element's position is continuously updated based on real-time finger position detection through cameras and sensors. As the finger moves laterally, the selection element responds accordingly, providing visual feedback of the intended selection. When the finger approaches the screen surface, the system detects this proximity and can trigger confirmation or adjust the selection, ensuring accurate final selection while maintaining touchless control throughout the interaction.
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
Enhances interaction accuracy by keeping the selection element visible and accessible, allowing users to control it with lateral finger movement above the screen, improving usability for diverse finger sizes and device orientations.
Implementation Method 1
a capacitive sensor operable to detect changes in an electromagnetic field resulting from a nearby object
Implementation Method 2
one or more cameras or other sensor(s) of the device, such as an electro-magnetic field (EMF) sensor or a capacitive sensor
Data Source
AI summary
A finger of a user detected within a predetermined range from a surface of a display screen can be used to navigate through and select content in accordance with various embodiments. In response to detecting the finger within the predetermined range, a selection element can be positioned offset from the finger. The offset positioning keeps the selection element from being obscured by the finger and, thus, enabling it to remain visible to the user. In response to detecting the user's finger approaching the surface of the display screen, the selection element becomes fixed in its current location when the finger reaches a threshold distance from the surface. Accordingly, as the finger gets closer to the surface, it starts to converge with the selection element. Finally, the finger converges with the selection element when the finger reaches the surface of the display screen to select the desired content.