Projector Keystone Correction Using Stable Rotation Sensing
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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 instability caused by temperature-induced deformation of internal components.
Innovation Solution
An electronic device with sensors to stabilize the sensor readings by identifying stable conditions, such as minimal temperature influence, before performing keystone correction based on accurate rotation angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the projector uses a tilt sensor to obtain rotation angle for keystone correction, then the keystone correction can be performed, but the sensor readings become incorrect due to temperature-induced deformations of internal components
Solution Approach 1:
The patent applies parameter changes by adjusting the reference rotation angle based on temperature measurements. The processor obtains temperature information from a temperature sensor and modifies the reference rotation angle parameter accordingly to compensate for thermal deformations. This allows the keystone correction to remain accurate despite temperature-induced changes in the projector's internal geometry.
Solution Approach 2:
The patent implements feedback by continuously monitoring temperature through a temperature sensor and using this information to dynamically adjust the reference rotation angle. The system creates a closed-loop control where temperature measurements feed back into the keystone correction algorithm, allowing real-time compensation for thermal effects on sensor accuracy.
2Manufacturing precision
If the projector performs keystone correction using obtained rotation angles, then image warping can be corrected, but incorrect sensor readings due to temperature lead to inaccurate correction
Solution Approach 1:
The patent changes the reference rotation angle parameter based on temperature conditions. By obtaining temperature information and adjusting the reference rotation angle accordingly, the system compensates for thermal deformations that would otherwise cause inaccurate rotation angle measurements and subsequent image projection errors.
Solution Approach 2:
The patent introduces temperature information as an intermediary parameter that mediates between the physical thermal state of the device and the keystone correction algorithm. The temperature data serves as a bridge to adjust the reference rotation angle, translating thermal effects into compensatory corrections that maintain image projection accuracy.
3Reliability
If the projector uses internal temperature variations for adjustment, then sensor stability can be maintained, but additional temperature sensing and processing complexity is introduced
Solution Approach 1:
The patent applies universality by using the temperature sensor for multiple purposes: monitoring device temperature for thermal management and simultaneously providing data for keystone correction compensation. This multi-functional use of the temperature sensing capability reduces the need for separate compensation mechanisms and integrates thermal awareness into the existing correction system.
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 raw data received from the sensor, a rotation angle of the electronic device, determine, based on a difference value for a preset time period in at least one of the raw data or the rotation angle, whether the sensor is stable, in response to determining that the sensor is stable, determine whether the rotation angle is greater than or equal to a reference rotation angle, and in response to determining that the rotation angle is greater than or equal to the reference rotation angle, perform, based on the rotation angle, image processing for keystone correction.