Optical Navigation Displacement Resolution Adjustment
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Solution Overview
Problem
Conventional optical navigation apparatuses have an invariable displacement resolution, leading to operational errors during varying user operations, such as cursor movement and clicking, due to horizontal movement of the finger, resulting in false click operations.
Innovation Solution
An optical navigation apparatus comprising a light source unit, an image sensing unit, and a processing unit that generates a beam of light, captures images, determines displacement information, and adjusts the displacement resolution based on a comparison with a threshold, setting higher resolution for cursor movement and lower resolution for clicking to reduce false clicks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the displacement resolution is set high for cursor movement, then the cursor can be moved precisely, but false click operations occur when the user intends to click
Solution Approach 1:
The patent applies dynamics by making the displacement resolution adjustable rather than fixed. The processing unit dynamically changes the displacement resolution based on the detected operation type: using a first (higher) resolution for cursor movement and a second (lower) resolution for click operations. This dynamic adjustment resolves the contradiction by adapting the measurement precision to the current operational context, ensuring both precise cursor movement and reliable click detection.
Solution Approach 2:
The patent implements parameter changes by modifying the displacement resolution parameter according to the operation type. The processing unit detects whether the user is performing cursor movement or click operation and changes the displacement resolution parameter accordingly. This parameter adjustment allows the system to maintain high precision during movement while reducing sensitivity during clicking, thereby preventing false clicks.
2Reliability
If the displacement resolution is set low to prevent false clicks, then click accuracy improves, but cursor movement precision deteriorates
Solution Approach 1:
The system dynamically adjusts the displacement resolution based on the detected operation type. When a click operation is detected, the system switches to a lower second displacement resolution to prevent false clicks. When cursor movement is detected, it switches to a higher first displacement resolution for precise positioning. This dynamic switching resolves the contradiction by applying the appropriate resolution level for each operation type.
Solution Approach 2:
The processing unit changes the displacement resolution parameter based on operation detection. For click operations, it sets the parameter to a lower value (second displacement resolution) to improve reliability. For cursor movement, it sets the parameter to a higher value (first displacement resolution) to maintain precision. This parameter adaptation resolves the contradiction between reliability and precision.
3Device complexity
If a fixed displacement resolution is used, then the device structure remains simple, but operational accuracy varies across different usage scenarios
Solution Approach 1:
The patent implements feedback by having the processing unit continuously monitor the operation type (cursor movement or click) and use this feedback to adjust the displacement resolution. The system detects the operation through image analysis, generates feedback about the operation type, and uses this feedback to select the appropriate resolution level. This feedback mechanism enables adaptive resolution adjustment without significantly increasing device complexity.
Solution Approach 2:
The processing unit performs self-service by automatically detecting the operation type and adjusting the displacement resolution without user intervention. The system monitors its own operation state, determines whether cursor movement or click is occurring, and autonomously adjusts the resolution parameter accordingly. This self-service capability improves operational accuracy while maintaining relatively simple device structure.
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
The apparatus accurately adjusts displacement resolution according to user operations, reducing the likelihood of false click events and enhancing overall operational accuracy.
Implementation Method 1
a beam of light is projected by a light source unit
Implementation Method 2
the images are captured by an image sensing unit
Data Source
AI summary
An optical navigation apparatus and an optical navigation method are provided. The optical navigation apparatus includes a light source unit, an image sensing unit, and a processing unit, wherein the processing unit is electrically connected to the light source unit and the image sensing unit. The light source unit generates a beam of light. The image sensing unit captures a plurality of images within a time interval. The processing unit determines that the beam of light is projected onto a touch object according to the images, calculates a piece of displacement information related to the touch object according to the images, generates a comparison result by comparing the piece of displacement information with a threshold, and sets a displacement resolution of the optical navigation apparatus according to the comparison result.