Adjustable Grating for 3D Display Crosstalk Reduction

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Solution Overview

Problem

Conventional grating-type 3D display technologies experience significant crosstalk and poor 3D effects when human eyes deviate from the optimal viewing distance, as they cannot independently view corresponding views.

Innovation Solution

A grating system with a first and second substrate, a liquid crystal layer, and driving modules that adjust the width of grating units based on the distance between the eyes and the screen, using a control module to generate driving signals that move light transmission parts closer to or further from the center, reducing crosstalk.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional variable gratings are used, then optimal 3D effect is achieved at optimal viewing distance, but crosstalk increases significantly when human eyes move forward or backward from the optimal viewing distance

Engineering Contradiction:

Improve3D display effectVSAvoidviewing distance range

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by making the grating structure adjustable and adaptable to different viewing distances. The liquid crystal layer can change the refraction rate of light dynamically, allowing the grating to adjust its parameters (such as grating period or depth) in real-time based on the detected viewing distance, thus maintaining optimal 3D effect across a range of distances rather than being fixed for a single optimal distance

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes physical parameters of the grating structure by utilizing the liquid crystal layer's ability to alter light refraction. By controlling the liquid crystal's molecular orientation through applied voltage, the effective grating parameters (refraction rate, optical path difference) are modified to compensate for variations in viewing distance, thereby reducing crosstalk and maintaining image quality

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the grating structure is fixed, then manufacturing is simple, but the system cannot adapt when viewing distance changes

Engineering Contradiction:

Improvegrating manufacturingVSAvoidviewing distance adaptation

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent maintains manufacturing simplicity while enabling adaptability by using a liquid crystal layer that can dynamically change optical parameters. The grating structure itself remains relatively simple to manufacture, but the liquid crystal layer adds the capability to adjust refraction rates and optical properties electrically, providing adaptability without complex mechanical adjustments or multiple fixed gratings

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces potential mechanical adjustment mechanisms with an electrically controlled liquid crystal system. Instead of physically moving or reconfiguring grating elements mechanically, the system uses electrical fields to control liquid crystal molecular orientation, thereby changing optical parameters electronically which simplifies the mechanical structure while maintaining adaptability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical 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 system effectively reduces crosstalk by independently driving strip-shaped electrodes and adjusting their width at the crosstalk position, improving the 3D display effect even when eyes move forward or backward relative to the screen.

Implementation Method 1

a liquid crystal layer between the first substrate and the second substrate; a plurality of driving modules configured to drive the plurality of the strip-shaped electrodes to enable liquid crystals to be deflected to form light shading parts and light transmission parts

Methodology Applied

Scientific EffectLiquid crystal deflection: Liquid Crystals

Implementation Method 2

Methodology Applied

Scientific EffectLight refraction: Refraction

Data Source

PatentUS12007587B2Grating, grating driving method and 3D display device

Publication Date: 2024.06.11 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present disclosure provides a grating including: a first substrate including stacked first and second electrode layers each including strip-shaped electrodes with an identical width, strip-shaped electrodes in the first and second electrode layers arranged alternately; a second substrate opposite to the first substrate with a liquid crystal layer therebetween; driving modules for driving the strip-shaped electrodes to form light shading parts and light transmission parts, one light shading part and one adjacent light transmission part defining a grating unit, at least one grating unit defining a grating part, the driving modules arranged in one-to-one correspondence with the grating parts; and a control module for generating driving signals in one-to-one correspondence with the driving modules according to a distance between the human eyes and the grating, thereby changing a width of the grating unit corresponding to a crosstalk position. A 3D display device and a grating driving method are provided.