Multi-view Display Parallax Barrier Brightness and Cross-talk

Solution Overview

Problem

Multi-view display devices face challenges in maintaining brightness and reducing cross-talk due to the absorption and reflection of light by parallax barriers, particularly when using black resin or metal materials, which affect image quality and user experience.

Innovation Solution

The use of a viewing converting unit with a first parallax barrier made of high reflective materials like Al, Al alloy, or Mo to reflect light and a second parallax barrier made of low reflective materials like black resin or CrOx to absorb light, positioned between the back light and the liquid crystal display panel, to control light paths and enhance brightness while minimizing cross-talk.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single-layer parallax barrier made of black resin or metal is used, then the device structure is simple, but the brightness is reduced due to light absorption and cross-talk occurs due to unwanted reflections

Engineering Contradiction:

Improveparallax barrier structureVSAvoidbrightness

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

The patent divides the parallax barrier into two separate layers: a lower reflective layer and an upper light-absorbing layer. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between structural simplicity and brightness performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines two different materials with complementary properties: a reflective material (such as aluminum or silver) for the lower layer and a light-absorbing material (such as black resin or chromium oxide) for the upper layer. This composite structure optimizes both brightness and cross-talk reduction.

Inventive Principle:

Principle #40Composite materials

2Device complexity

If a single-layer parallax barrier made of black resin or metal is used, then the device structure is simple, but cross-talk increases due to unwanted light reflections

Engineering Contradiction:

Improveparallax barrier structureVSAvoidcross-talk

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The patent divides the parallax barrier into two separate layers: a lower reflective layer and an upper light-absorbing layer. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between structural simplicity and brightness performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines two different materials with complementary properties: a reflective material (such as aluminum or silver) for the lower layer and a light-absorbing material (such as black resin or chromium oxide) for the upper layer. This composite structure optimizes both brightness and cross-talk reduction.

Inventive Principle:

Principle #40Composite materials

3Illumination intensity

If light is reflected by the parallax barrier, then brightness can be maintained, but cross-talk occurs due to unwanted reflections

Engineering Contradiction:

ImprovebrightnessVSAvoidcross-talk

Core Design Contradiction:

Illumination intensityVSObject-generated harmful factors

Solution Approach 1:

The patent applies different optical properties to different locations in the parallax barrier structure: the lower layer has high reflectivity to maintain brightness, while the upper layer has high light absorption to prevent cross-talk. This local differentiation of material properties resolves the contradiction between brightness and cross-talk reduction.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent combines two different materials with complementary properties: a reflective material (such as aluminum or silver) for the lower layer and a light-absorbing material (such as black resin or chromium oxide) for the upper layer. This composite structure optimizes both brightness and cross-talk reduction.

Inventive Principle:

Principle #40Composite materials

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 improves brightness by over 45% and reduces cross-talk by ensuring sufficient light is supplied to the liquid crystal display panel while preventing unwanted reflections, thereby enhancing the overall image quality and user experience.

Implementation Method 1

at least one first parallax barrier made of high reflective material to reflect the light on the substrate

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

at least one second parallax barrier made of low reflective material to absorb the light on the first parallax barriers

Methodology Applied

Scientific EffectAbsorption: Absorption (EM radiation)

Data Source

PatentUS7940357B2Multi view display device and method of fabricating thereof

Publication Date: 2011.05.10 LG DISPLAY CO LTD

AI summary

A multi-viewing display device includes a display panel for displaying images; a back light for supplying the light to the display panel; and a viewing converting unit having a plurality of parallax barriers for reflecting the light from the back light and non-reflecting the light from the display panel to control the path of the light in accordance with a desired viewing direction. The viewing converting unit may include a substrate; at least one layer of a parallax barrier made of high reflective material to reflect the light on the substrate; and at least one layer of the parallax barrier made of low reflective material to block the light on the first parallax barriers.