Projection Device Trapezoidal Correction Across Surface Boundaries
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Solution Overview
Problem
Conventional projection technologies face challenges in maintaining a smooth and stable projection image when changing the projection position, particularly at the boundaries between different surfaces like walls and ceilings, leading to non-continuous shape changes and instability due to inadequate trapezoidal correction methods.
Innovation Solution
A projection device equipped with a projection unit, a direction changer, a projection angle deriver, and a correction unit that adjusts the trapezoidal distortion correction based on the derived projection angle, ensuring continuous correction within specific angle ranges to maintain a stable image shape across surface boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If trapezoidal correction is performed using conventional methods with predetermined displacement angles, then the projection image can be corrected for trapezoidal distortion, but the shape of the projected video changes in a non-continuous manner at corner positions, causing instability
Solution Approach 1:
The patent applies dynamics by making the trapezoidal correction method adaptive and changeable based on real-time projection conditions. Instead of using fixed correction methods, the system dynamically switches between different correction approaches (first correction method for non-corner regions, second correction method for corner regions) based on the projection position and angle, thereby maintaining continuous and stable image shape throughout the projection area.
Solution Approach 2:
The patent implements local quality by applying different trapezoidal correction methods to different regions of the projection surface. Specifically, the first correction method is applied to non-corner regions while the second correction method is applied to corner regions, allowing each region to receive the most appropriate correction for its specific geometric characteristics, thus preventing non-continuous shape changes at corners.
2Adaptability or versatility
If the projection position is changed from front wall to ceiling while continuing video projection, then the projection can cover multiple surfaces, but the corner region exhibits non-continuous shape changes due to inadequate correction methods
Solution Approach 1:
The system dynamically adapts the correction method based on the projection position and surface being projected onto. When projecting across multiple surfaces (front wall to ceiling), the system automatically switches between the first correction method for wall portions and the second correction method for ceiling portions, ensuring continuous image shape at the boundary between surfaces.
Solution Approach 2:
The patent creates a universal correction system that can handle multiple projection scenarios (single surface, multi-surface, different angles) through two complementary correction methods. The first correction method handles standard trapezoidal distortion, while the second correction method specifically handles boundary and corner regions, together providing universal coverage for all projection situations.
3Device complexity
If a single trapezoidal correction method is used for all projection positions, then the device complexity is reduced, but the projection image becomes unstable at boundary and corner regions
Solution Approach 1:
The patent segments the projection surface into different regions (corner regions and non-corner regions) and applies appropriate correction methods to each segment. This segmentation allows the system to maintain simplicity within each region while ensuring overall reliability across the entire projection surface by using region-specific correction strategies.
Solution Approach 2:
Different correction qualities are applied to different regions: the first correction method provides standard trapezoidal correction for most areas, while the second correction method provides enhanced correction specifically for corner and boundary regions, ensuring high reliability where it is most needed without unnecessarily complicating the entire 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
The solution enables the projection of a smooth and stable image by continuously adjusting the trapezoidal correction based on the projection angle, preventing discontinuous shape changes and ensuring a stable viewing experience across different surfaces.
Implementation Method 1
a projection unit for converting input image data into light and projecting the converted light with a predetermined view angle as a projection image
Data Source
AI summary
A projection device includes a correction unit that corrects a trapezoidal distortion of a projection image projected onto a projection medium in accordance with a projection angle derived by a projection angle deriving unit, and the correction unit sets a correction amount for the trapezoidal distortion of a case where the derived projection angle is changed within a range larger than a first predetermined angle determined based on the projection direction toward a boundary between a first projection face and a second projection face and smaller than a second predetermined angle determined based on the projection direction toward the boundary to be the correction amount for the trapezoidal distortion at one of the first predetermined angle and the second predetermined angle or less.