Inclined Movable Screen Reciprocation for Display Control

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Solution Overview

Problem

Existing display devices require complex control to manage the movement of a movable screen, particularly when displaying virtual images in a vertical direction, as they need to be temporarily stopped to align the image formation direction with the screen's movement, complicating the control process.

Innovation Solution

A display device with a light source, scanner, movable screen, and optical system that allows the screen to reciprocate in an inclined posture, enabling image formation in directions perpendicular to the screen's movement, thus eliminating the need for urgent stops and simplifying control by increasing the beam scanning area relative to screen movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the movable screen is temporarily stopped to align image formation direction with screen movement, then the image can be displayed in vertical direction, but the control complexity increases

Engineering Contradiction:

Improveimage alignment precisionVSAvoidcontrol complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Instead of stopping the screen to align the image with the screen movement, the patent inverts the approach by inclining the screen at a predetermined angle so that the image formation direction naturally aligns with the screen's inclined movement direction. This eliminates the need for stopping and complex control while achieving proper alignment.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent transforms the static alignment approach (stopping the screen) into a dynamic solution where the screen continuously moves in an inclined posture. The scanner beam scans across the moving inclined screen, creating a virtual image that naturally aligns with the screen's movement direction without requiring temporary stops.

Inventive Principle:

Principle #15Dynamics

2Ease of manufacture

If the movable screen reciprocates in posture perpendicular to moving directions, then the image formation is simplified, but the control complexity increases due to urgent stops

Engineering Contradiction:

Improveimage formation easeVSAvoidcontrol ease

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The patent changes the screen posture from perpendicular to the moving direction to an inclined posture at a predetermined angle. This inversion of the traditional approach allows the image formation direction to align naturally with the inclined screen movement, eliminating the need for urgent stops and simplifying control operations.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the key parameter of screen posture from perpendicular (90 degrees) to an inclined angle (predetermined angle less than 90 degrees). This parameter change enables the scanner beam to naturally align with the screen movement direction during reciprocating motion, eliminating the need for urgent stops while maintaining ease of image formation.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If the beam scanning area is increased relative to screen movement, then the control complexity is reduced, but the stroke amount increases

Engineering Contradiction:

Improvecontrol complexityVSAvoidstroke amount

Core Design Contradiction:

Device complexityVSLength of moving object

Solution Approach 1:

The patent optimizes the relationship between beam scanning area and screen movement by adjusting the screen's inclined angle. This parameter change allows the scanner beam to cover the necessary area while the screen moves through a reduced stroke distance, as the inclined posture enables more efficient utilization of the screen movement for image formation.

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 configuration simplifies the control of the movable screen, reduces the complexity of image display, and allows for efficient projection of virtual images in both vertical and depth directions without the need for urgent stops, minimizing the stroke amount and enhancing operational ease.

Implementation Method 1

a light source configured to emit a light beam, a scanner configured to cause the light beam from the light source to scan

Methodology Applied

Scientific EffectLight beam scanning: Laser

Implementation Method 2

an optical system configured to display project a virtual image of the image formed in the movable screen on a display medium

Methodology Applied

Scientific EffectVirtual image projection: Reflection

Data Source

PatentEP3299866B1Display device

Publication Date: 2020.03.25 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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Figure 2
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AI summary

The present invention provides a display device that can easily perform control for driving a movable screen. Display device (2) includes light source (36) that emits a light beam, scanner (38) that causes the light beam from light source (36) to scan, movable screen (28) in which a first image is formed by transmitting the light beam from scanner (38), projection unit (32) that displays a virtual image of the first image in a space, and driver (30) that causes movable screen (28) to reciprocate in a first direction separating from scanner (38) and in a second direction approaching scanner (38). Movable screen (28) reciprocates in a posture inclined to moving directions of movable screen (28).