Optical Sensor Positioning via Display Patterns
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Solution Overview
Problem
Display devices with optical sensors face increased costs and reduced motor lifespan due to over-rotation when powered on, as they lack a brightness sensor to accurately return to the origin position.
Innovation Solution
A display device with an optical sensing unit and a processing unit that displays a pattern with different optical characteristics, allowing the sensing unit to determine its position and control the driving unit to minimize over-rotation by moving to a target position using specific driving parameters, eliminating the need for a brightness sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a brightness sensor is added to sense the optical sensor position, then the optical sensor can return to the origin point accurately, but the manufacturing cost increases
Solution Approach 1:
The optical sensing unit is designed to perform dual functions: it serves as both the optical sensor for detecting display characteristics and as the position detection mechanism. The same optical sensing unit that detects brightness and color also detects its own position by sensing the optical characteristics of different display patterns, eliminating the need for a separate brightness sensor and reducing manufacturing costs.
Solution Approach 2:
The optical sensing unit uses itself to detect its position. By displaying different optical patterns at different positions and having the optical sensing unit sense these patterns, the system achieves self-positioning without requiring external sensors. The optical sensing unit serves its own positioning needs, reducing overall system complexity and cost.
2Ease of manufacture
If no brightness sensor is used, then the manufacturing cost is reduced, but the motor lifespan decreases due to over-rotation
Solution Approach 1:
The system implements feedback control for motor positioning. The optical sensing unit continuously senses the optical characteristics of displayed patterns, and the processing unit compares the sensed characteristics with reference values to determine the current position. Based on this feedback, the motor controller adjusts the motor rotation to stop precisely at the origin point, preventing over-rotation and extending motor lifespan while eliminating the need for a separate brightness sensor.
Solution Approach 2:
The patent replaces the mechanical position detection system (brightness sensor) with an optical sensing approach. Instead of using a separate mechanical sensor to detect position, the system uses optical patterns displayed on the screen and sensed by the optical sensing unit to determine position electronically, reducing mechanical wear and extending motor lifespan.
3Stability of the object's composition
If the optical sensor stops at a specific position when powered off, then the position is maintained, but the motor must over-rotate to return to the origin point when powered on, reducing motor lifespan
Solution Approach 1:
The feedback mechanism allows the system to know the exact position of the optical sensing unit after power-off. When powered on, the processing unit uses the sensed optical characteristics to calculate the required motor rotation amount to reach the origin point, enabling precise positioning without over-rotation. This maintains position stability while protecting motor lifespan.
Solution Approach 2:
The system performs preliminary positioning action by sensing the optical characteristics immediately upon power-on and calculating the required adjustment before actual motor movement begins. This preliminary calculation ensures the motor rotates only the necessary amount to reach the origin point, preventing unnecessary over-rotation and extending motor lifespan while maintaining position stability.
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 reduces over-rotation of the driving unit, extending its lifespan and lowering the display device's cost by eliminating the need for a brightness sensor while accurately positioning the optical sensing unit.
Implementation Method 1
the optical sensing unit is located within one of the areas and senses the optical characteristic of the one of the areas correspondingly
Data Source
AI summary
A display device includes a casing, a display unit, an optical sensing unit, a driving unit and a processing unit. The processing unit controls the display unit to display a predetermined pattern corresponding to a predetermined range. The predetermined pattern includes a target area. The target area is adjacent to a target position and corresponds to a driving parameter of the driving unit. When the optical sensing unit is located within the target area, the driving unit drives the optical sensing unit to move to the target position by a predetermined manner. When the optical sensing unit is located beyond the target area, the driving unit drives the optical sensing unit to move towards the target position. When the optical sensing unit moves to a boundary of the target area, the driving unit drives the optical sensing unit to move to the target position by the driving parameter.