Sensor-Stable Keystone Correction for Temperature-Shifted Projectors
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Solution Overview
Problem
Projectors experience keystone distortion when the angle between the projected light and the projection surface is not a right angle, leading to inaccurate image correction due to sensor inaccuracies caused by temperature-induced deformation of the printed circuit board and incorrect data sensing.
Innovation Solution
An electronic device with sensors to stabilize data sensing by identifying stable sensor conditions, filtering noise, and performing keystone correction only when the sensor is stable, using temperature and motion detection to adjust reference angles based on internal temperature and sensor stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If keystone correction is performed using sensor data, then image distortion is corrected, but measurement precision deteriorates due to temperature-induced sensor inaccuracies
Solution Approach 1:
The system performs preliminary actions by storing multiple reference images captured at different temperatures before actual keystone correction is needed. When temperature-induced sensor inaccuracies occur, the system selects the appropriate pre-captured reference image corresponding to the current temperature range, avoiding the need to perform correction with inaccurate real-time sensor data.
Solution Approach 2:
The system changes the parameter of reference images by capturing and storing them at different temperature conditions. This creates a set of reference images with varying thermal states, allowing the system to select the most appropriate reference image that matches current environmental conditions, thereby compensating for temperature-induced sensor drift.
2Manufacturing precision
If continuous keystone correction is performed, then image distortion is continuously corrected, but loss of time increases due to unnecessary corrections during sensor instability
Solution Approach 1:
The system implements feedback by continuously monitoring temperature sensor data and comparing it against threshold values that indicate stable versus unstable sensor conditions. Keystone correction is only performed when the feedback from temperature monitoring indicates stable sensor operation, preventing wasteful corrections during unstable periods and reducing unnecessary processing time.
3Measurement precision
If multiple reference images are stored for different temperature conditions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system applies local quality by creating temperature-specific reference images only when needed and storing them in designated memory locations. Each reference image is associated with specific temperature ranges, allowing the system to selectively access only the relevant reference images for current conditions, rather than maintaining a complex universal correction system.
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
Accurate keystone correction is achieved by ensuring sensor stability and minimizing temperature-induced errors, resulting in precise image projection without distortion.
Implementation Method 1
obtain, based on raw data obtained by using the sensor, a rotation angle of the electronic device
Data Source
AI summary
An electronic device includes: a sensing unit including a sensor; a memory storing one or more instructions; and one or more processors configured to execute the one or more instructions stored in the memory to: obtain, based on data received from the sensor, a rotation angle of the electronic device, identify, based on a difference value for a preset time period in at least one of the raw data or the rotation angle, a stability of the sensor, in response to the sensor being stable, compare the rotation angle to a reference rotation angle, and in response to the rotation angle being greater than or equal to the reference rotation angle, perform a keystone correction based on the rotation angle.