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Time-sequentially pulsed LED light source for image projectors

A technology for displays and LED devices, applied in the field of light sources

Inactive Publication Date: 2007-07-04
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The problem with the solution disclosed in US 2003 / 0218723 A1 is that the movable parts imply multiple mechanical constraints
In addition, the manufacture of mechanically complex moving structures is also problematic

Method used

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  • Time-sequentially pulsed LED light source for image projectors
  • Time-sequentially pulsed LED light source for image projectors
  • Time-sequentially pulsed LED light source for image projectors

Examples

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Embodiment Construction

[0031] FIG. 1 shows a projection display system 100 comprising a light source 120 , a controller 104 , an image generating device 106 and a projection lens 108 . Projection display system 100 projects an image on screen 110 . The image generating device 106 preferably includes a liquid crystal panel 112 and an analyzer 114 . The light source 102 provides polarized light to the liquid crystal panel 112 of the image generating device 106 . The liquid crystal panel 112 modulates light in a plurality of pixels. The effect of the liquid crystal panel 112 is that light from modulated pixels will change polarization, while light from unmodulated pixels will not change. Thus, the analyzer 114 is a polarizing filter with a transmission polarization direction perpendicular to that of the light illuminating the liquid crystal panel 112, and will eliminate light from unmodulated pixels to improve image clarity. The controller 104 controls light generation by the light source 102 and im...

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PUM

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Abstract

A light source device for projection displays is disclosed, comprising a plurality of Light Emitting Diode (LED) devices. The plurality of LED devices are arranged to sequentially operate. A light combining means are arranged to convey light from the LED devices to a light output of the light source. The light combining means comprises controllable polarisation means arranged such that the light is polarized by a structure of the light combining means. Further, a projection display system comprising a projection lens, a controller, and an image generating means, using the light source above is disclosed.

Description

technical field [0001] The invention relates to a light source for a projection display system, in particular to a light source using sequentially running light-emitting diodes. Background technique [0002] The purpose of using a light emitting diode (LED) as a light source for a projection display is due to the small size, high durability and long life of the LED. However, in projection displays, the brightness of the light source is critical to the image quality and usability of the projection system in different environments. [0003] In US 2003 / 0218723 A1 it is disclosed that the emission output of LEDs decreases due to the heating of the LEDs during operation. This phenomenon reduces the brightness of the light source either because it means operating at low power or because the light source heats up and emits less. In US2003 / 0218723 A1 this problem is solved by introducing a non-emission time for each LED by placing the LEDs on a movable part where the LEDs are in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/74H01L33/48H01L33/58H01L33/60
CPCG03B21/2033H04N9/3197H04N9/315G03B21/20G03B21/2073H04N5/7441
Inventor M·P·C·M·克里杰恩S·T·德兹沃特
Owner KONINK PHILIPS ELECTRONICS NV
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