3D Display Screen Fresnel Lens Phase Difference Control

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Solution Overview

Problem

Conventional display screens struggle to display 3D images with high contrast ratios, especially in bright environments, due to limitations in phase difference management and light reflection.

Innovation Solution

A display screen configuration incorporating a Fresnel lens layer with a reflective layer and a protection layer, where the protection layer can include materials like polycarbonate with an embossed pattern and carbon black, and a primer between the Fresnel lens layer and the protection layer, to reduce phase difference and enhance contrast.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conventional display screen is used, then the structure is simple, but the phase difference between lens layer and protection layer causes poor 3D image quality

Engineering Contradiction:

Improvephase difference controlVSAvoidlayer structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The display screen is divided into multiple functional layers: lens layer, first protection layer, second protection layer, and third protection layer. Each layer serves a specific function in controlling light propagation and reducing phase difference, allowing the complex problem of phase difference control to be solved through modular layer design rather than a single complex component

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses composite material structures where each protection layer can have different refractive indices and optical properties. The combination of multiple layers with varying material properties enables precise control of phase difference while maintaining overall system functionality, resolving the contradiction between precision control and structural simplicity

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If conventional materials are used in the display screen, then the manufacturing process is simple, but the contrast ratio in bright rooms is poor

Engineering Contradiction:

Improvecontrast ratio in bright roomVSAvoidmanufacturing process complexity

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent applies different material properties to different layers: the lens layer has specific refractive index for light focusing, while protection layers have varying refractive indices and optical densities to control light transmission and reflection locally. This local optimization of material properties improves contrast ratio in bright environments without requiring complete redesign of the entire structure

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes optical density and refractive index variations across layers to control light absorption and reflection, effectively managing contrast perception in different lighting conditions. The layered structure with varying optical properties creates localized light management that enhances contrast ratio in bright rooms

Inventive Principle:

Principle #32Color changes

3Reliability

If the protection layer is added to protect the Fresnel lens layer, then the lens layer is protected, but phase difference increases causing 3D image degradation

Engineering Contradiction:

Improvelens layer protectionVSAvoidphase difference control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The first protection layer acts as an intermediary between the lens layer and the second protection layer, with its refractive index specifically optimized to reduce phase difference. This intermediary layer serves dual functions: protecting the lens layer while simultaneously managing optical phase, thus resolving the contradiction between protection and phase control

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent carefully selects and optimizes the refractive index parameters of each protection layer. By adjusting these optical parameters, the system achieves both mechanical protection of the lens layer and precise control of phase difference, resolving the contradiction between reliability and manufacturing precision

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

The configuration effectively displays 3D images with improved contrast ratios in bright rooms by minimizing phase difference and utilizing carbon black to reduce black luminance, enabling clear image projection.

Implementation Method 1

a Fresnel lens layer

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

a reflective layer formed on the light-exiting surface of the Fresnel lens layer to reflect image light

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS9170478B2Display screen of image display system and method for manufacturing the same

Publication Date: 2015.10.27 LG ELECTRONICS INC

AI summary

Disclosed are a display screen of an image display system capable of displaying a 3D (three-dimensional) image and providing an image with a high contrast ratio in a bright room and a method for manufacturing the same. The display screen includes: a Fresnel lens layer; a reflective layer formed the light-exit surface of the Fresnel lens layer to reflect image light; and a protection layer formed on the light-incident surface of the Fresnel lens layer, wherein one surface of the protection layer may have an embossed pattern.