Phosphor-based lamps for projection display

A phosphor and laser technology, applied to optical components, instruments, optics, etc. to change the spectral characteristics of emitted light, can solve problems such as limited LED brightness

Inactive Publication Date: 2015-09-30
MEADOWSTAR ENTERPRISES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the output of the projector is limited by the brightness of the LED

Method used

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  • Phosphor-based lamps for projection display
  • Phosphor-based lamps for projection display
  • Phosphor-based lamps for projection display

Examples

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Embodiment Construction

[0039] figure 2 Structure showing a light source that emits white light. A layer of phosphor material 18 is disposed over the blue LED 20 , which in turn is mounted on a heat sink 22 . Phosphor layer 18 is excited by blue light generated by LED 20 and produces red and green light. The phosphor is tuned, typically by varying the thickness of the phosphor layer or the density of the phosphor deposit, so that the overall output of blue light from the LED, and red and green light from the phosphor material 18, is white light.

[0040] image 3 show adoption figure 2 An embodiment of the light source of the blue LED 20 and phosphor material 18 but also including the loop 24 . Recirculating ring 24 has an inwardly reflecting generally hemispherical outer surface 26 and an aperture 28 centered on emission axis 30 . In the manner shown, light emitted from LED 20 and phosphor material 18 having a low emission angle with respect to axis 30 passes through the aperture as the outpu...

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Abstract

A phosphor-based lamp includes a phosphor material and an excitation source, which may be a laser or an LED, or both. Preferably, the lamp includes a recycling collar to reflect and recycle high angle light to increase brightness. Preferably, when the excitation source is a laser, a beam splitter redirects the laser beam to direct the laser beam through the recycling collar aperture onto the phosphor material. Light emitted by the phosphor material which exits the aperture passes through the beam splitter as the output of the lamp. Alternatively, lenses are used to redirect the laser beam around the recycling collar towards the phosphor material. Preferably, a plurality of excitation lasers are disposed around the recycling collar and aimed either to direct their outputs onto the phosphor material or toward an opposing wall, where the outputs are reflected onto the phosphor material. Such lamp may be used as part of a projection system. In one embodiment, the phosphor material is contained on the color wheel.

Description

[0001] Cross references related to this application [0002] This application claims priority to U.S. Provisional Patent Application No. 61 / 673,357, filed July 19, 2012, and U.S. Provisional Patent Application No. 61 / 834,119, filed June 12, 2013. Background technique [0003] Different types of light sources are known for use in projection displays. Known light sources use arc lamps, LEDs, and phosphors as light sources. LED light sources are desirable for their long life and low energy consumption. White LEDs are especially used in shadow displays because they are simpler and less expensive than mixing red, green and blue LEDs together. However, the output of the projector is limited by the brightness of this LED. To increase brightness, it has been proposed to recycle part of the unused LED output back to the LED itself to enhance the brightness of the projector. [0004] Phosphor materials excited by lasers can be roughly divided into three categories according to thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V7/04
CPCF21V29/58F21Y2101/02F21V9/00F21V29/30F21K9/56F21V9/16F21Y2113/005G03B21/14G03B21/204F21V9/30F21K9/64F21V29/59F21Y2113/13F21Y2115/10F21K9/65F21Y2101/00F21V7/00F21V7/0025F21V7/045F21V7/06G02B5/12G02B6/29337G02B6/4269G02B23/105G02B27/283G03B21/2066G03B21/28
Inventor K·李S·因那苏古
Owner MEADOWSTAR ENTERPRISES
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