Optical Sensor On-Screen Pointer Navigation
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Solution Overview
Problem
Mobile devices with display screens face limitations in input interfaces for on-screen navigation due to their compact size, relying on directional keypads, styluses, and thumbwheels, which are less efficient compared to larger devices.
Innovation Solution
An on-board optical sensor is used to detect relative movement between the device and a reference surface, moving an on-screen pointer accordingly, and can also function as a camera and scanner in various modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional input interfaces (directional keypad, stylus, thumbwheel) are used for on-screen navigation in mobile devices, then the device structure remains simple, but the navigation efficiency and user experience deteriorate compared to larger devices
Solution Approach 1:
The patent replaces mechanical input interfaces (keypad, stylus, thumbwheel) with an optical sensing system. The optical sensor detects relative movement between the device and a reference surface, and the navigation module translates this movement into pointer movement on the display screen, substituting mechanical interaction with optical-field interaction to achieve more efficient navigation.
Solution Approach 2:
The patent introduces an optical sensor as an intermediary between the user's physical movement and the on-screen pointer. The sensor captures images of the reference surface, and the navigation module processes these images to determine relative movement, serving as a mediator that converts physical displacement into digital navigation commands without requiring direct mechanical input.
2Productivity
If the optical sensor is used for navigation, then navigation efficiency improves, but the device complexity increases due to additional processing requirements
Solution Approach 1:
The patent makes the optical sensor multi-functional by enabling it to serve both as a navigation input device and as a camera/scanner. The same hardware component (optical sensor) and image processing capabilities are used for different purposes: tracking relative movement for navigation and capturing images for photography or scanning, thereby reducing overall device complexity through functional consolidation.
Solution Approach 2:
The patent merges the navigation function with the camera/scanner function by using the same optical sensor and image processing pipeline for both purposes. The navigation module and camera application share common hardware resources and software processing routines, combining previously separate functions into a unified system that reduces complexity rather than increasing it.
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 solution provides an alternative and efficient navigation method by using the optical sensor to track device movement and control the on-screen pointer, enhancing navigation capabilities on mobile devices without the need for additional input devices.
Implementation Method 1
an optical sensor fixed to the main body for capturing successive images and providing image signals representative of the captured images to the processor
Data Source
AI summary
A mobile computing device, including a main body, a processor and associated memory housed within the main body, a display screen housed within the main body and responsive to signals from the processor, an optical sensor fixed to the main body for capturing successive images and providing image signals representative of the captured images to the processor, and a navigation module associated with the processor for determining, based on the image signals, a relative movement between the main body and a reference surface and moving a pointer on the display screen based on the determined relative movement.