Rear Projection Display Laser Excitation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional display technologies face challenges in energy efficiency and cost-effectiveness, particularly in larger screen sizes, with plasma displays being inefficient and LCDs favored due to lower manufacturing costs despite MEMS devices being more energy-efficient.

Innovation Solution

A rear projection display system using a scanning infrared laser to excite individual red, green, and blue subpixels, incorporating a spatial light modulator and rare earth doped glass or phosphors to achieve efficient light emission, with optics directing the laser beam to create a visible image.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If plasma display technology is used to achieve exceptional saturation and brightness, then image quality is improved, but energy efficiency deteriorates

Engineering Contradiction:

ImprovebrightnessVSAvoidenergy efficiency

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent replaces the plasma discharge mechanism with a laser excitation system. Instead of using electrical plasma to excite phosphors, the invention uses laser light to directly excite photoluminescent materials, thereby eliminating the inefficient plasma generation process while maintaining high brightness output

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the excitation mechanism from electrical plasma to optical laser excitation. This parameter change in the excitation method fundamentally improves energy efficiency while maintaining or enhancing the brightness performance, as lasers provide more efficient energy conversion to the photoluminescent materials

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If LCD technology is used to achieve lower manufacturing costs, then cost-effectiveness is improved, but energy efficiency and image quality deteriorate

Engineering Contradiction:

Improvemanufacturing costVSAvoidenergy efficiency

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent replaces the LCD light valve mechanism with a laser excitation system. Instead of using individually addressed light valves that consume significant energy, the invention uses laser excitation of photoluminescent materials, achieving superior energy efficiency while maintaining cost-effectiveness through simplified device architecture

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs composite photoluminescent materials that can be excited by laser light to produce multiple colors. This use of composite photoluminescent materials allows the system to achieve the image quality and energy efficiency of advanced displays while maintaining the manufacturing simplicity and cost-effectiveness of simpler display architectures

Inventive Principle:

Principle #40Composite materials

3Use of energy by moving object

If MEMS device is used to achieve high energy efficiency and cost-effectiveness, then energy efficiency is improved, but manufacturing complexity and device complexity deteriorate

Engineering Contradiction:

Improveenergy efficiencyVSAvoiddevice complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the complex MEMS mirror or transmissive element components from the display system. By using laser excitation of photoluminescent materials, the invention removes the need for individually addressed mirrors or transmissive elements, thereby simplifying the device architecture while maintaining high energy efficiency

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses a universal laser excitation system that can address multiple photoluminescent materials simultaneously. This multi-functional approach replaces the need for separate addressing mechanisms for different pixels or subpixels, simplifying the overall device complexity while maintaining the energy efficiency benefits of selective excitation

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 enhances energy efficiency and cost-effectiveness by using a scanning infrared laser to excite subpixels, allowing for high-definition imaging with improved brightness and color gamut, while minimizing quantum defects and maximizing photoluminescence efficiency.

Implementation Method 1

a scanning infrared laser to excite individual red, green, and blue subpixels in a rear projection architecture

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

an optical light source, such as a laser

Methodology Applied

Scientific EffectLaser: Laser

Data Source

PatentUS8696136B2Rear projection display using laser excited photoluminescence

Publication Date: 2014.04.15 PHOTODIGM INC

AI summary

A display system includes an optical light source and a display panel with an array of optically excitable pixels. Optics are positioned between the optical light source and the display panel so as to direct light from the optical light source toward the display panel to cause the optically excitable pixels to emit a visible image.