Patent US6683657B1 successfully refreshed from Google Patents.
US6683657B1
Expired / Lapsed
US
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Projection display device and application system of same
Assignee: Canon Inc
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Filing: 2000-09-26
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Granted: 2004-01-27
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Expires: 2020-09-26
Abstract
Abstract A projection display device has a large dynamic range in addition to a large-sized screen and high definition. In a projection display device for projecting an image formed by an optical modulator to display the image, an illumination-light amount modulating unit for adjusting an amount of light illuminated to the optical modulator is provided between a light source for illuminating the optical modulator and the optical modulator.
Inventors
- 👤 Mamoru Miyawaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:23
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3179; H04N5/00; H04N5/74; H04N5/7416; H04N9/3102; H04N9/3105; H04N9/3141; H04N9/315; H04N9/3155
Claims Analysis
Total Claims: 68
Claim 1
Independent Claim
77 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; and illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator, wherein said illumination light amount modulating means comprises a rotating system including a polarizing plate.
Claim 2
Dependent Claim
77 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; and illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator, wherein said illumination light amount modulating means comprises a rotating system including a polarizing plate.
Claim 3
Dependent Claim
18 words
A projection display device according to claim 1 , wherein said optical modulator comprises a liquid crystal panel.
Claim 4
Dependent Claim
36 words
A projection display device according to claim 1 , further comprising a PS converter for polarizing at least a light beam from said light source, wherein said polarizing plate is disposed downstream of said PS converter.
Claim 5
Dependent Claim
25 words
A projection display device according to claim 1 , wherein said rotating system is controlled in accordance with a signal calculated from input image data.
Claim 6
Dependent Claim
19 words
A projection display device according to claim 1 , wherein said rotating system comprises a motor and an encoder.
Claim 7
Dependent Claim
54 words
A projection display device according to claim 5 , wherein said motor of said rotating system is controlled so that output data of a light amount sensor for detecting the amount of light illuminated to said optical modulator is equal to a desired value corresponding to a signal calculated from the input image data.
Claim 8
Dependent Claim
36 words
A projection display device according to claim 2 , further comprising a PS converter for polarizing at least a light beam from said light source, wherein said polarizing plate is disposed downstream of said PS converter.
Claim 9
Dependent Claim
25 words
A projection display device according to claim 2 , wherein said rotating system is controlled in accordance with a signal calculated from input image data.
Claim 10
Dependent Claim
19 words
A projection display device according to claim 2 , wherein said rotating system comprises a motor and an encoder.
Claim 11
Dependent Claim
54 words
A projection display device according to claim 9 , wherein said motor of said rotating system is controlled so that output data of a light amount sensor for detecting the amount of light illuminated to said optical modulator is equal to a desired value corresponding to a signal calculated from the input image data.
Claim 12
Dependent Claim
76 words
A projection display device, comprising: projection means including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; and illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator, wherein said illumination-light amount modulating means comprises a rotating system including a phase plate.
Claim 13
Dependent Claim
76 words
A projection display device, comprising: projection means including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; and illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator, wherein said illumination-light amount modulating means comprises a rotating system including a phase plate.
Claim 14
Dependent Claim
36 words
A projection display device according to claim 11 , further comprising a PS converter for polarizing at least a light beam from said light source, wherein said phase plate is disposed downstream of said PS converter.
Claim 15
Dependent Claim
25 words
A projection display device according to claim 11 , wherein said rotating system is controlled in accordance with a signal calculated from input image data.
Claim 16
Dependent Claim
19 words
A projection display device according to claim 11 , wherein said rotating system comprises a motor and an encoder.
Claim 17
Dependent Claim
54 words
A projection display device according to claim 14 , wherein said motor of said rotating system is controlled so that output data of a light amount sensor for detecting the amount of light illuminated to said optical modulator is equal to a desired value corresponding to a signal calculated from the input image data.
Claim 18
Dependent Claim
18 words
A projection display device according to claim 11 , wherein said optical modulator comprises a liquid crystal panel.
Claim 19
Dependent Claim
36 words
A projection display device according to claim 16 , further comprising a PS converter for polarizing at least a light beam from said light source, wherein said phase plate is disposed downstream of said PS converter.
Claim 20
Dependent Claim
25 words
A projection display device according to claim 16 , wherein said rotating system is controlled in accordance with a signal calculated from input image data.
Claim 21
Dependent Claim
19 words
A projection display device according to claim 16 , wherein said rotating system comprises a motor and an encoder.
Claim 22
Dependent Claim
54 words
A projection display device according to claim 19 , wherein said motor of said rotating system is controlled so that output data of a light amount sensor for detecting the amount of light illuminated to said optical modulator is equal to a desired value corresponding to a signal calculated from the input image data.
Claim 23
Dependent Claim
93 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; and illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator, wherein said illumination-light amount modulating means comprises an iris and a stepping motor, and wherein said iris has an aperture controlled in accordance with a signal calculated from input image data.
Claim 24
Dependent Claim
93 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; and illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator, wherein said illumination-light amount modulating means comprises an iris and a stepping motor, and wherein said iris has an aperture controlled in accordance with a signal calculated from input image data.
Claim 25
Dependent Claim
16 words
A projection display device according to claim 21 , wherein said optical modulator comprises a DMD.
Claim 26
Dependent Claim
26 words
A projection display device according to claim 21 , wherein said iris is disposed in a position not in a conjugate relation to said optical modulator.
Claim 27
Dependent Claim
18 words
A projection display device according to claim 21 , wherein said optical modulator comprises a liquid crystal panel.
Claim 28
Dependent Claim
16 words
A projection display device according to claim 21 , wherein said optical modulator comprises a DMD.
Claim 29
Dependent Claim
111 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; and illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator, wherein said illumination-light amount modulating means comprises an iris and a stepping motor, and wherein said motor is controlled so that detection data of the amount of light illuminated to said optical modulator is equal to a desired value corresponding to a signal calculated from the input image data.
Claim 30
Dependent Claim
111 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; and illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator, wherein said illumination-light amount modulating means comprises an iris and a stepping motor, and wherein said motor is controlled so that detection data of the amount of light illuminated to said optical modulator is equal to a desired value corresponding to a signal calculated from the input image data.
Claim 31
Dependent Claim
18 words
A projection display device according to claim 26 , wherein said optical modulator comprises a liquid crystal panel.
Claim 32
Dependent Claim
16 words
A projection display device according to claim 26 , wherein said optical modulator comprises a DMD.
Claim 33
Dependent Claim
26 words
A projection display device according to claim 26 , wherein said iris is disposed in a position not in a conjugate relation to said optical modulator.
Claim 34
Dependent Claim
143 words
A projection display system comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator; luminance-level calculation processing means for calculating a display luminance level from input image data; illuminating-light amount calculation processing means for calculating an amount of illumination light depending on the calculated luminance level; illumination-light control processing means for controlling said illumination-light amount modulating means in accordance with the calculated amount of illumination light; and write signal processing means for computing a signal to be written in said optical modulator in accordance with the calculated luminance level and the calculated amount of illumination light.
Claim 35
Dependent Claim
143 words
A projection display system comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator; luminance-level calculation processing means for calculating a display luminance level from input image data; illuminating-light amount calculation processing means for calculating an amount of illumination light depending on the calculated luminance level; illumination-light control processing means for controlling said illumination-light amount modulating means in accordance with the calculated amount of illumination light; and write signal processing means for computing a signal to be written in said optical modulator in accordance with the calculated luminance level and the calculated amount of illumination light.
Claim 36
Dependent Claim
45 words
A projection display system according to claim 30 , wherein said illumination-light amount calculation processing means calculates, as maximum luminance, a maximum one of luminance values of pixels in each field or frame and calculates the amount of illumination based on the calculated maximum luminance.
Claim 37
Dependent Claim
63 words
A projection display system according to claim 30 , wherein said illumination-light amount calculation processing means divides luminance levels in each field or frame into n layers, calculates, as maximum luminance, an expected value of the luminance levels within m groups obtained by grouping an uppermost one of the n layers, and calculates the amount of illumination based on the calculated maximum luminance.
Claim 38
Dependent Claim
66 words
A projection display according to claim 30 , wherein said illumination-light amount calculation processing means selects pixels in each field or frame successively in higher luminance order from the highest, calculates, as maximum luminance, a luminance level at which the number of the selected pixels exceeds a predetermined percentage of the total pixel number, and calculates the amount of illumination based on the calculated maximum luminance.
Claim 39
Dependent Claim
36 words
A projection display system according to any one of claims 31 to 33 , wherein said illumination-light amount calculation processing means sets said maximum luminance as the amount of illumination light for each field or frame.
Claim 40
Dependent Claim
34 words
A projection display system according to claim 34 , wherein said illumination-light control processing means changes the amount of illumination light in sync with a vertical sync signal for an image to be displayed.
Claim 41
Dependent Claim
69 words
A projection display system according to claim 34 , wherein said illumination-light control processing means performs 100% illumination during a period in which the calculated maximum luminance is higher than a predetermined level after taking a 100% level, and changes the amount of illumination light in real time for each field for frame until the calculated maximum luminance restores to the 100% level after being reduced below predetermined level.
Claim 42
Dependent Claim
55 words
A projection display system according to claim 36 , wherein when said illumination-light control processing means changes the amount of illumination light in real time, said illumination-light control processing means changes the amount of illumination light in sync with the input image data or a vertical in sync signal for an image to be displayed.
Claim 43
Dependent Claim
96 words
A projection display system according to claim 37 , further comprising light-amount detecting means for detecting an amount of light illuminated to said optical modulator, wherein said illumination-light control processing means changes the amount of illumination light under servo control in accordance with an output of said light-amount detecting means, said illumination-light amount calculation processing means determines a desired amount of illumination light from an input video signal, and said write signal processing means determines, after the amount of actually illuminated light has been measured, a write signal level in accordance with the measured light amount.
Claim 44
Dependent Claim
94 words
A projection display device, comprising: projection means, including a light source, for protecting an image; image display means, including an optical modulator, for displaying an image; illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator; and an optical system for separating colors, wherein said illumination-light amount modulating means is disposed downstream of said optical system, wherein said illumination-light amount modulating means comprises a rotating system including polarizing plate.
Claim 45
Dependent Claim
94 words
A projection display device, comprising: projection means, including a light source, for protecting an image; image display means, including an optical modulator, for displaying an image; illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator; and an optical system for separating colors, wherein said illumination-light amount modulating means is disposed downstream of said optical system, wherein said illumination-light amount modulating means comprises a rotating system including polarizing plate.
Claim 46
Dependent Claim
18 words
A projection display device according to claim 39 , wherein said optical modulator comprises a liquid crystal panel.
Claim 47
Dependent Claim
36 words
A projection display device according to claim 39 , further comprising a PS converter for polarizing at least a light beam from said light source, wherein said polarizing plate is disposed downstream of said PS converter.
Claim 48
Dependent Claim
95 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator; and an optical system for separating colors, wherein said illumination-light amount modulating means is disposed downstream of said optical system wherein said illumination-light amount modulating means comprises a rotating system including a phase plate.
Claim 49
Dependent Claim
95 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator; and an optical system for separating colors, wherein said illumination-light amount modulating means is disposed downstream of said optical system wherein said illumination-light amount modulating means comprises a rotating system including a phase plate.
Claim 50
Dependent Claim
36 words
A projection display device according to claim 42 , further comprising a PS converter for polarizing at least a light beam from said light source, wherein said polarizing plate is disposed downstream of said PS converter.
Claim 51
Dependent Claim
25 words
A projection display device according to claim 42 , wherein said rotating system is controlled in accordance with a signal calculated from input image data.
Claim 52
Dependent Claim
19 words
A projection display device according to claim 42 , wherein said rotating system comprises a motor and an encoder.
Claim 53
Dependent Claim
54 words
A projection display device according to claim 45 , wherein said motor of said rotating system is controlled so that output data of a light amount sensor for detecting the amount of light illuminated to said optical modulator is equal to a desired value corresponding to a signal calculated from the input image data.
Claim 54
Dependent Claim
112 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator; and an optical system for separating colors, wherein said illumination-light amount modulating means is disposed downstream of said optical system, wherein said illumination-light amount modulating means comprises an iris and a stepping motor, and wherein said iris has an aperture controlled in accordance with a signal calculated from input image data.
Claim 55
Dependent Claim
112 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator; and an optical system for separating colors, wherein said illumination-light amount modulating means is disposed downstream of said optical system, wherein said illumination-light amount modulating means comprises an iris and a stepping motor, and wherein said iris has an aperture controlled in accordance with a signal calculated from input image data.
Claim 56
Dependent Claim
16 words
A projection display device according to claim 47 , wherein said optical modulator comprises a DMD.
Claim 57
Dependent Claim
26 words
A projection display device according to claim 47 , wherein said iris is disposed in a position not in a conjugate relation to said optical modulator.
Claim 58
Dependent Claim
131 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; and illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator; and an optical system for separating colors, wherein said illumination-light amount modulating means is disposed downstream of said optical system, wherein said illumination-light amount modulating means comprises an iris and a stepping motor, and wherein said motor is controlled so that detection data of the amount of light illuminated to said optical modulator is equal to a desired value corresponding to a signal calculated from the input image data.
Claim 59
Dependent Claim
131 words
A projection display device, comprising: projection means, including a light source, for projecting an image; image display means, including an optical modulator, for displaying an image; and illumination-light amount modulating means for adjusting an amount of light illuminated to said optical modulator, said illumination-light amount modulating means being provided between said light source for illuminating said optical modulator and said optical modulator; and an optical system for separating colors, wherein said illumination-light amount modulating means is disposed downstream of said optical system, wherein said illumination-light amount modulating means comprises an iris and a stepping motor, and wherein said motor is controlled so that detection data of the amount of light illuminated to said optical modulator is equal to a desired value corresponding to a signal calculated from the input image data.
Claim 60
Dependent Claim
18 words
A projection display device according to claim 50 , wherein said optical modulator comprises a liquid crystal panel.
Claim 61
Dependent Claim
16 words
A projection display device according to claim 50 , wherein said optical modulator comprises a DMD.
Claim 62
Dependent Claim
26 words
A projection display device according to claim 50 , wherein said iris is disposed in a position not in a conjugate relation to said optical modulator.
Claim 63
Dependent Claim
18 words
A projection display device according to claim 47 , wherein said optical modulator comprises a liquid crystal panel.
Claim 64
Dependent Claim
18 words
A projection display device according to claim 42 , wherein said optical modulator comprises a liquid crystal panel.
Claim 65
Dependent Claim
36 words
A projection display device according to claim 55 , further comprising a PS converter for polarizing at least a light beam from said light source, wherein said polarizing plate is disposed downstream of said PS converter.
Claim 66
Dependent Claim
25 words
A projection display device according to claim 55 , wherein said rotating system is controlled in accordance with a signal calculated from input image data.
Claim 67
Dependent Claim
19 words
A projection display device according to claim 55 , wherein said rotating system comprises a motor and an encoder.
Claim 68
Dependent Claim
54 words
A projection display device according to claim 58 , wherein said motor of said rotating system is controlled so that output data of a light amount sensor for detecting the amount of light illuminated to said optical modulator is equal to a desired value corresponding to a signal calculated from the input image data.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-01-26 | 2007-07-28 | 2008-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-01-26 | 2011-07-28 | 2012-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-01-26 | 2015-07-28 | 2016-01-27 | $7700.00 | Window Closed / Lapsed |