Projection Image Pixel Shift Control via Resampling

Solution Overview

Problem

Existing projection image apparatuses cause unnatural image displays due to repeated turning on and off of pixel shift, leading to resolution changes based on scene motion speed and spatial frequency.

Innovation Solution

A projection image apparatus with a transparent parallel plain plate that is swing-drive-controlled about one or two axes, combined with a resampling processor and controller, selectively performs no pixel shift, 1-axis, or 2-axes pixel shift in response to the number of pixels and frame rate of the input image signal to maintain consistent image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If pixel shift is repeatedly turned on and off depending on image signal type, then image resolution is optimized for different scenes, but unnatural image display occurs due to resolution changes

Engineering Contradiction:

Improveimage resolutionVSAvoidimage quality consistency

Core Design Contradiction:

Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

The patent applies dynamics by making the pixel shift function continuously operable rather than statically on/off, allowing the transparent parallel plain plate to continuously adjust pixel positions in response to motion detection, thereby maintaining both high resolution and natural image display

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operational parameter of pixel shift from binary (on/off) to continuous adjustment levels, where the degree of pixel shifting is dynamically modified based on detected motion speed and spatial frequency, resolving the contradiction between resolution optimization and image consistency

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If pixel shift is always on to maintain consistent resolution, then image quality consistency is improved, but power consumption increases

Engineering Contradiction:

Improveimage quality consistencyVSAvoidpower consumption

Core Design Contradiction:

Stability of the object's compositionVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic action by continuously detecting motion in the image signal and dynamically adjusting pixel shift operations accordingly, allowing the system to maintain image quality consistency while reducing power consumption by activating pixel shift only when motion is detected rather than operating continuously at full capacity

Inventive Principle:

Principle #19Periodic action

3Use of energy by moving object

If pixel shift is turned off to reduce power consumption, then power efficiency is improved, but unnatural image display occurs when motion speed or spatial frequency changes

Engineering Contradiction:

Improvepower consumptionVSAvoidimage quality consistency

Core Design Contradiction:

Use of energy by moving objectVSStability of the object's composition

Solution Approach 1:

The patent applies dynamics by making the pixel shift function continuously operable rather than statically on/off, allowing the transparent parallel plain plate to continuously adjust pixel positions in response to motion detection, thereby maintaining both high resolution and natural image display

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operational parameter of pixel shift from binary (on/off) to continuous adjustment levels, where the degree of pixel shifting is dynamically modified based on detected motion speed and spatial frequency, resolving the contradiction between resolution optimization and image consistency

Inventive Principle:

Principle #35Parameter changes

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 prevents unnatural image displays by controlling pixel shift based on input signal characteristics, ensuring consistent image quality even with changing motion speed and spatial frequency.

Implementation Method 1

a transparent parallel plain plate that is swing-drive-controlled about one or two of two axes orthogonal to each other, the transparent parallel plain plate changing an optical path of the image light from the image display element to perform pixel shift about the one or two of the two axes for the image light

Methodology Applied

Scientific EffectOptical path change through rotation:

Data Source

PatentUS11417249B2Projection image apparatus and method of controlling the same

Publication Date: 2022.08.16 PANASONIC PROJECTOR & DISPLAY CORPORATION

AI summary

A projection image apparatus includes an image display element that generate image light according to an input image signal, a transparent parallel plain plate that is swing-drive-controlled about one or two of two axes, the transparent parallel plain plate changing an optical path of the image light to perform pixel shift about the one or two of the two axes, a resampling processor that performs resampling process for the input image signal, and a controller that selectively executes one of the following three actions in response to a number of pixels and a frame rate of the input image signal, (1) to avoid the resampling process and the pixel shift, (2) the resampling process related to pixel shift about the one axis and pixel shift about the one axis, and (3) the resampling process related to pixel shift about the two axes and pixel shift about the two axes.