Scanning Beam Displays Using Phosphor Layers for Compact Design
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Solution Overview
Problem
Conventional display systems, such as CRTs, face limitations due to the use of cathode-ray tubes, leading to a decline in demand as they produce vivid colors but are technically cumbersome, while other systems like projection displays require complex optical lens systems and larger form factors.
Innovation Solution
The development of scanning beam display systems utilizing fluorescent layers with specific phosphor compositions that absorb excitation light at a single wavelength and emit visible light, including red, green, and blue colors, eliminating the need for optical lens systems and enabling more compact designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If CRT displays use cathode-ray tubes to produce vivid colors, then color quality is improved, but device complexity and size increase
Solution Approach 1:
The patent extracts the light emission function from the complex cathode-ray tube structure by using phosphor materials that can be directly excited by UV or violet light to emit visible colors, eliminating the need for electron beam generation and vacuum tube components
Solution Approach 2:
The patent changes the excitation parameter from electron beams (CRT) to optical excitation (UV/violet light), allowing the use of phosphor materials that convert the excitation light into visible colors, thereby simplifying the device structure while maintaining color vividness
2Illumination intensity
If projection displays use optical lens systems to produce color images, then image quality is improved, but device size increases
Solution Approach 1:
The patent extracts the color generation function from the optical lens system by using phosphor materials that directly emit colors when excited by UV or violet light, eliminating the need for complex projection optics and reducing device size
Solution Approach 2:
The patent replaces the mechanical optical lens system with a photonic solution using phosphor materials that convert UV/violet light into visible colors through photoluminescence, thereby eliminating bulky optical components
3Measurement precision
If direct display systems use multiple light sources for red, green and blue colors, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the color emission function into different phosphor materials, each responsible for emitting a specific color (red, green, blue) when excited by UV or violet light, allowing precise color control without multiple light sources
Solution Approach 2:
The patent makes UV or violet light the universal excitation source for all phosphor materials, which then convert it into different colors, replacing the need for separate red, green, and blue light sources with a single excitation source
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
These systems produce high-resolution, vivid color images efficiently by using fluorescent materials that absorb UV or violet light to emit specific colors, reducing the complexity and size of display devices compared to traditional technologies.
Implementation Method 1
phosphor compositions that absorb excitation light at a single wavelength and emit visible light, including red, green, and blue colors
Implementation Method 2
fluorescent layers with specific phosphor compositions that absorb excitation light at a single wavelength and emit visible light
Data Source
AI summary
This specification describes phosphor compositions used in fluorescent layers for scanning beam displays. In general, one aspect of the subject matter described in this specification can be embodied in a display device having a fluorescent layer that absorbs an excitation light at a single wavelength and emits visible light. The fluorescent layer includes a plurality of parallel fluorescent stripes. At least three adjacent fluorescent stripes are made of three different fluorescent materials, which include a first fluorescent material that absorbs the excitation light and emits light of a first color, a second fluorescent material that absorbs the excitation light and emits light of a second color, and a third fluorescent material that absorbs the excitation light and emits light of a third color.