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Method of colour image projection using spatial light modulation and light source modulation

A technology of spatial light modulator and light source, which is applied in the direction of image reproducer of projection device, image communication, color TV, etc., can solve the problem of insufficient resolution, etc., and achieve the effect of enhancing grayscale resolution

Active Publication Date: 2012-03-21
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This resolution is insufficient due to the non-linear nature of the human eye, especially since losses due to other effects also occur

Method used

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  • Method of colour image projection using spatial light modulation and light source modulation
  • Method of colour image projection using spatial light modulation and light source modulation
  • Method of colour image projection using spatial light modulation and light source modulation

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0028] figure 1One example of a projection system operable in accordance with the method is shown. The projection system comprises a control unit (not shown), a digital light modulator 1 and three LED arrays for red (array 2), green (array 3) and blue (array 4). The light of the three LED arrays is directed through a dichroic combiner 5 and a Fresnel field lens 6 to the array of switchable elements of the digital light modulator 1 . The optical system also includes a wire grid grid PBS (Polarizing Beam Splitter) 7 and a lens system 8 for guiding the modulated light reflected from the digital light modulator 1 to the screen.

[0029] The light of the solid state light sources, in this example LED arrays 2, 3, 4, is directed to the digital light modulator 1 in a sequential manner. The switchable elements of the digital light modulator 1 are switched according to the grayscale and color information to be displayed by means of pulse width modulation with one of the three colors ...

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Abstract

The present invention relates to a method of operating a projection system comprising several solid state light sources (2, 3, 4) of different colour 13, 14, 15) and at least one spatial light modulator (1) having an array of switchable elements. Said array is illuminated by at least one of said light sources (2, 3, 4) for several illumination periods and is addressed such that the light is timely and spatially modulated to project images onto a screen. In the present method said light sources (2, 3, 4) are controlled to emit light modulated in amplitude (15) and / or time (18) during said illumination periods of the array. With the present method an increased greyscale resolution of the projection system can be achieved.

Description

technical field [0001] The present invention relates to a method of operating a projection system comprising a plurality of solid state light sources of different colors and at least one spatial light modulator having an array of switchable elements, wherein said array is illuminated by at least one of said light sources for a plurality of illumination periods and is addressed such that the light is temporally and spatially modulated in order to project an image onto a screen. The invention also relates to a projection device operating in accordance with the method. Background technique [0002] Projection systems with spatial light modulators are often used as the basis for display systems. Examples of spatial light modulators are liquid crystal devices (LCDs), digital micromirror devices (DMDs), and actuated mirror arrays (AMAs). One or more light sources illuminate the array of individually switchable elements of these devices. The array is addressed such that the ligh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/31H04N5/74G09G3/36
CPCH04N9/3197G09G2310/0235G09G3/2014H04N9/3114G09G3/2011H04N9/3155G09G3/002H04N9/3111G09G3/36H04N5/74
Inventor C·德佩H·莫恩克
Owner SIGNIFY HLDG BV