Projector Horizontal Displacement Sensor Distortion Correction

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Solution Overview

Problem

Existing projectors face difficulties in correcting image distortions when projected at large horizontal swing-and-tilt angles, as operators struggle to recognize rectangular shapes due to oblique viewing angles, and lack of screen frames for reference makes solo adjustments challenging, especially when projecting onto walls.

Innovation Solution

A projector apparatus equipped with at least two displacement sensors to detect horizontal displacements, a rotational angle calculator to determine the horizontal swing-and-tilt angle, and a distortion corrector to automatically correct distortions based on calculated angles, allowing a single operator to easily correct image distortions without visual recognition of the rotation axis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the projector is rotated horizontally for swing-and-tilt projection, then the projector can project images onto surfaces at oblique angles, but the image distortion becomes complex and difficult to correct

Engineering Contradiction:

Improveprojection angle flexibilityVSAvoiddistortion correction difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The system performs preliminary detection of horizontal displacements using acceleration sensors before projection, calculates the rotational angle in advance, and pre-computes the distortion correction parameters. This allows the projector to automatically compensate for distortion without requiring manual adjustment during operation, resolving the contradiction between projection flexibility and correction ease.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces manual visual adjustment mechanisms with an automated electronic system consisting of acceleration sensors, a rotational angle calculator, and a distortion correction unit. This substitution eliminates the need for operators to visually assess and manually correct distortion, making the system equally effective at any horizontal rotation angle.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If the horizontal swing-and-tilt angle is large (e.g., 30 degrees), then the projector achieves greater positioning flexibility, but the operator cannot properly recognize the rectangular image for adjustment

Engineering Contradiction:

Improveprojection positioning flexibilityVSAvoidvisual recognition accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The projector performs self-measurement of its rotational angle through acceleration sensors that detect horizontal displacements. The rotational angle calculator automatically computes the angle without requiring external visual reference, and the distortion correction unit applies the appropriate correction autonomously. This self-service capability eliminates the need for operators to visually recognize image shape at difficult angles.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The acceleration sensors serve as intermediaries between the projector's physical orientation and the control system. Instead of relying on human visual perception, the sensors objectively measure horizontal displacements and provide data to the rotational angle calculator, which then determines the precise rotation angle for distortion correction.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If manual adjustment through visual process is used, then simple trapezoidal distortion can be corrected, but complex distortion at large horizontal angles requires multiple confirmations and assistance

Engineering Contradiction:

Improveadjustment simplicityVSAvoidcorrection time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The system continuously monitors horizontal displacements through acceleration sensors and provides real-time feedback to the rotational angle calculator. This feedback loop enables the system to dynamically adjust distortion correction parameters based on the actual projection angle, achieving accurate correction in a single operation without requiring multiple trial-and-error adjustments or external confirmation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces the manual visual adjustment process with an automated control system that uses acceleration sensor data to calculate and apply distortion correction. This substitution eliminates the time-consuming process of visual assessment and manual adjustment, providing rapid automatic correction regardless of the horizontal rotation angle.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS7661825B2Projector having horizontal displacement sensors for correcting distortion

Publication Date: 2010.02.16 SHARP KK

AI summary

A projector apparatus has a projection device for projecting an image onto a projection surface; at least two displacement sensors for detecting horizontal displacements of the projector apparatus, the displacement sensors being spaced a predetermined distance from each other; a rotational angle calculator for calculating a rotational angle of the projector apparatus in a horizontal plane using the predetermined distance and the horizontal displacements, the horizontal displacements being detected by the displacement sensors; and a distortion corrector for correcting distortion of the image by using the rotational angle, the image being projected by the projection device, wherein the rotational angle is calculated by the rotational angle calculator as a horizontal corrective angle.