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Projection and display system

A projection system, wavelength technology, applied in the direction of printing equipment, instruments, parts of color TV, etc., can solve problems such as inefficiency

Inactive Publication Date: 2012-07-18
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, current LEDs, especially those that emit green light, are relatively inefficient

Method used

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  • Projection and display system
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Embodiment Construction

[0027] Projection systems have been described, for example, in the published PCT Patent Application No. WO2008 / 109296 entitled "ARRAY OF LUMINESCENT ELEMENTS" and provide higher resolution at low power and small size. rate and high brightness. The projection system includes a monolithic two-dimensional array of electroluminescent devices, some or all of which elements contain adjacent II-VI quantum well downconverters.

[0028] This patent application describes projection systems, and in particular, microprojection systems that include electroluminescent devices or arrays of electroluminescent devices and arrays of multilayer semiconductor stacks that, in some embodiments, are The array of luminescent devices and the array of multilayer semiconductor stacks are capable of downconversion and arranged to convert light emitted by the electroluminescent device(s) into light of a different wavelength. In one embodiment, scanning optics are used to direct light from the electrolumi...

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Abstract

A projection system and a display that incorporates the projection system are provided. The projection system includes at least one electroluminescent device that emits a first wavelength of light, at least one semiconductor multilayer stack that downconverts the first wavelength of light to a second wavelength of light, and a scanning optical element that transmits the light along a scanned direction. The electroluminescent device can be part of an array of electroluminescent devices, and can be monolithic. The semiconductor multilayer stack can be part of an array of semiconductor multilayer stacks, and can also be monolithic. The scanning optical element can be positioned to scan the electroluminescent device across the semiconductor multilayer stack, or it can be positioned to scan the downconverted light after it has left the semiconductor multilayer stack.

Description

Background technique [0001] Illumination systems are used in a variety of different applications including projection display systems, backlights for liquid crystal displays, and the like. Projection systems typically use one or more conventional white light sources, such as high pressure mercury lamps. White light beams are typically split into three primary colors, red, green, and blue, and directed to respective imaging spatial light modulators to generate images of each primary color. The resulting primary color image beams are combined and projected onto a projection screen for easy viewing. Conventional white light sources are generally bulky, emit one or more primary colors of light with low efficiency, are difficult to integrate, and often lead to increased size and energy consumption in optical systems that employ them. [0002] Recently, light emitting diodes (LEDs) have been considered as alternative light sources to traditional white light sources. LEDs have the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/20G03B21/28G03B27/00
CPCG03B21/204H04N9/3138H04N9/3129G03B21/20G03B21/28
Inventor 史蒂文·J·威利特马丁·B·沃尔克特里·L·史密斯罗伊·A·奥尔巴克迈克尔·A·哈斯史蒂文·G·萨克斯托米·W·凯利
Owner 3M INNOVATIVE PROPERTIES CO