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AssigneeKoninklijke Philips Electronics N.V.
InventorsDouglas A. Stanton, Martinus V. C. Stroomer, Adrianus J. S. M. De Vaan
Estimating the term…
The present invention relates to a method of generating an image having a desired brightness, which image is generated by means of a device provided with at least one light source, at least one electro-optical light modulation panel and at least one light-control device. The light from the light source is converted into an image having a desired brightness via at least the electro-optical light modulation panel and the light-control device. The image to be projected is analyzed in a regulator, whereafter the electro-optical light modulation panel and the light-control device are driven, while a too bright image is generated by means of the electro-optical light modulation panel, which image is converted by means of the light-control device into an image having a desired brightness and a desired contrast.
A method of generating an image having a desired brightness, which image is generated by means of a device comprising at least one light source, at least one electro-optical light modulation panel and at least one light-control device, the light from the light source being converted into an image having a desired brightness via at least the electro-optical light modulation panel and the light-control device, characterized in that the image to be projected is analyzed in a regulator, whereafter the electro-optical light modulation panel and the light-control device are driven, and a too bright image is generated by means of the electro-optical light modulation panel, which image is converted by means of the light-control device into an image having a desired brightness and a desired contrast, operation of the light control device being optimized for each image.
Dependencies are inferred from the claim text.
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Using two-dimensional electronic spatial light modulators: for displaying all colours simultaneously, e.g. by using two or more electronic spatial…
Using two-dimensional electronic spatial light modulators: for displaying the colours sequentially, e.g. by using sequentially activated light sources
Driving therefor: for spatial light modulators in series
Constructional details thereof: modulator illumination systems
Term ended 2 Sep 2019 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The invention relates to a method of generating an image having a desired brightness, which image is generated by means of a device comprising at least one light source, at least one electro-optical light modulation panel and at least one light-control device, the light from the light source being converted into an image having a desired brightness via at least the electro-optical light modulation panel and the light-control device.
The invention also relates to a device which is suitable for generating an image having a desired brightness by means of such a method, which device comprises at least one light source, at least one electro-optical light modulation panel and at least one light-control device.
In such a method and device known from U.S. Pat. No. 5,597,223, the light-control device comprises a diaphragm having an adjustable aperture. The device is applicable in a light or a dark ambience, with the aperture size being adjusted in dependence upon a light or a dark ambience, such that bright images or images which are rich in contrast are accentuated.
In the drawings,
FIG. 1 shows a first embodiment of a device according to the invention,
FIG. 2 shows a second embodiment of a device according to the invention,
Corresponding components in the Figures are denoted by the same reference numerals.
FIG. 1 shows a device 1 according to the invention, comprising a light source 2, three electro-optical light modulation panels 3, 4, 5 with which a green G, a red R and a blue B part, respectively, of an image to be projected is realized, and a light-control device 6 arranged between the light source 2 and the light modulation panels 3-5. A folding mirror 7 and a PBS 8 (Polarizing Beam Splitter) are arranged between the light source 2 and the light-control device 6. The light-control device 6 may be a diaphragm, but in the embodiment shown here, the light-control device is provided with a twisted nematic cell having a polarizer at an exit side. Lenses 9, (dichroic) folding mirrors 10 and polarization filters 11 are arranged between the light-control device 6 and the light modulation panels 3-5. The lenses 9, (dichroic) folding mirrors 10 and filters 11 are known per se and will therefore not be described in greater detail. The device 1 further comprises a projection lens 12. Filters 11 and (dichroic) folding mirrors 10 are also arranged between the light modulation panels 3-5 and the projection lens 12.
The device 1 further comprises a regulator 13. The regulator 13 has a video signal input 14 which is connected to a video signal analyzer 15 and to a video signal amplifier 16. The video signal analyzer 15 is also connected to the video signal amplifier 16. The video signal amplifier 16 has a video signal line 17 which is also connected to the light modulation panels 3-5. The regulator 13 further comprises a drive module 18 which is arranged between the video signal analyzer 15 and the light-control device 6.