US6719428B2
Expired / Lapsed
US
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Projector device and projector system having irregular color and irregular luminance correction circuit
Assignee: Sharp NEC Display Solutions Ltd
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Filing: 2002-10-31
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Granted: 2004-04-13
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Expires: 2022-10-31
Abstract
Abstract An irregular color and irregular luminance correction circuit includes a memory, a CPU (Central Processing Unit), and an external interface. In the memory, luminance distribution values, luminance inclination values, screen distribution values, and correction values at n-pieces of levels at each correction point obtained at factory adjustment are stored as digital data. The CPU generates a correction value based on the luminance distribution value, the luminance inclination value, and the screen distribution value and stores these values in the memory as digital data. The irregular color and irregular luminance correction circuit performs irregular color and irregular luminance correction for an input image signal based on the correction value and an interpolation value. With these configurations, irregular color and irregular luminance caused by a display device and a screen in a projector can be solved.
Inventors
- 👤 Toshiyuki Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:22
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3179; H04N9/3182; H04N5/00; H04N5/74; H04N9/64; H04N9/73; H04N5/14; H04N5/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
281 words
A projector device comprising: a display device for displaying an image; an optical system for enlarged-projecting said image displayed on said display device by a light from a light source; a memory for storing: a luminance distribution value at each point in a projected image when said image is projected on a screen having no characteristic of angle of visibility, a luminance inclination value at each point of said projected image when said image is projected on said screen having no characteristic of angle of visibility, said luminance inclination value is a ratio of a luminance of an image signal level (L−m)<L<(L+m) near the image signal level L, where m is an integer greater than or equal to 1, and a luminance of the image signal level L, a screen distribution value which is a luminance at each point in said projected image when said image is projected on a screen having a characteristic of angle of visibility after correcting irregular color and irregular luminance by said display device and said optical system, and a correction value which is an image signal level in which a product of said luminance distribution value and said screen distribution value at said each point is equal to said luminance inclination value; an internal central processing unit for calculating said correction value; an external interface for inputting data into said memory in accordance with instructions of said internal central processing unit; and an irregular color and irregular luminance correction circuit for obtaining an interpolation value based on said correction value read from said memory and for correcting said irregular color and irregular luminance on said screen based on said correction value and said interpolation value.
Claim 2
Dependent Claim
281 words
A projector device comprising: a display device for displaying an image; an optical system for enlarged-projecting said image displayed on said display device by a light from a light source; a memory for storing: a luminance distribution value at each point in a projected image when said image is projected on a screen having no characteristic of angle of visibility, a luminance inclination value at each point of said projected image when said image is projected on said screen having no characteristic of angle of visibility, said luminance inclination value is a ratio of a luminance of an image signal level (L−m)<L<(L+m) near the image signal level L, where m is an integer greater than or equal to 1, and a luminance of the image signal level L, a screen distribution value which is a luminance at each point in said projected image when said image is projected on a screen having a characteristic of angle of visibility after correcting irregular color and irregular luminance by said display device and said optical system, and a correction value which is an image signal level in which a product of said luminance distribution value and said screen distribution value at said each point is equal to said luminance inclination value; an internal central processing unit for calculating said correction value; an external interface for inputting data into said memory in accordance with instructions of said internal central processing unit; and an irregular color and irregular luminance correction circuit for obtaining an interpolation value based on said correction value read from said memory and for correcting said irregular color and irregular luminance on said screen based on said correction value and said interpolation value.
Claim 3
Dependent Claim
46 words
The projector system according to claim 1 , wherein, for screens having different characteristics of angles of visibility, corresponding screen distribution values are stored in said memory, and a correction value corresponding to each of said screen distribution values is calculated and stored in said memory.
Claim 4
Dependent Claim
55 words
The projector device according to claim 1 , wherein, for a screen whose characteristic of angle of visibility is not stored in said memory, said screen distribution value is updated by using said external interface and said internal central processing unit, and said correction value is further updated based on said updated screen distribution value.
Claim 5
Dependent Claim
281 words
A projector system comprising: a display device for displaying an image; an optical system for enlarged-projecting of said image displayed on said display device by a light from a light source; a memory for storing: a luminance distribution value at each point in a projected image when said image is projected on a screen having no characteristic of angle of visibility, a luminance inclination value at each point of said projected image when said image is projected on said screen having no characteristic of angle of visibility, said luminance inclination value is a ratio of a luminance of an image signal level (L−m)<L<(L+m) near the image signal level L, where m is an integer greater than or equal to 1, and a luminance of the image signal level L, a screen distribution value which is a luminance at each point in said projected image when said image is projected on a screen having a characteristic of angle of visibility after correcting irregular color and irregular luminance by said display device and said optical system, and a correction value which is an image signal level in which a product of said luminance distribution value and said screen distribution value at said each point is equal to said luminance inclination value; a central processing unit for calculating said correction value; an external interface for inputting data into said memory in accordance with instructions of said central processing unit; and an irregular color and irregular luminance correction circuit for obtaining an interpolation value based on said correction value read from said memory and for correcting said irregular color and said irregular luminance on said screen based on said correction value and said interpolation value.
Claim 6
Dependent Claim
281 words
A projector system comprising: a display device for displaying an image; an optical system for enlarged-projecting of said image displayed on said display device by a light from a light source; a memory for storing: a luminance distribution value at each point in a projected image when said image is projected on a screen having no characteristic of angle of visibility, a luminance inclination value at each point of said projected image when said image is projected on said screen having no characteristic of angle of visibility, said luminance inclination value is a ratio of a luminance of an image signal level (L−m)<L<(L+m) near the image signal level L, where m is an integer greater than or equal to 1, and a luminance of the image signal level L, a screen distribution value which is a luminance at each point in said projected image when said image is projected on a screen having a characteristic of angle of visibility after correcting irregular color and irregular luminance by said display device and said optical system, and a correction value which is an image signal level in which a product of said luminance distribution value and said screen distribution value at said each point is equal to said luminance inclination value; a central processing unit for calculating said correction value; an external interface for inputting data into said memory in accordance with instructions of said central processing unit; and an irregular color and irregular luminance correction circuit for obtaining an interpolation value based on said correction value read from said memory and for correcting said irregular color and said irregular luminance on said screen based on said correction value and said interpolation value.
Claim 7
Dependent Claim
43 words
The projector system according to claim 4 , wherein a projector device comprises: said display device, said optical system, said memory, and said irregular color and irregular luminance correction circuit, and wherein said central processing unit and said external interface are external devices.
Claim 8
Dependent Claim
46 words
The projector system according to claim 4 , wherein, for screens having different characteristics of angles of visibility, corresponding screen distribution values are stored in said memory, and a correction value corresponding to each of said screen distribution values is calculated and stored in said memory.
Claim 9
Dependent Claim
54 words
The projector system according to claim 4 , wherein, for a screen whose characteristic of angle of visibility is not stored in said memory, said screen distribution value is updated by using said external interface and said central processing unit, and said correction value is further updated based on said updated screen distribution value.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-04-13 | 2007-10-13 | 2008-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-04-13 | 2011-10-13 | 2012-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-04-13 | 2015-10-13 | 2016-04-13 | $7700.00 | Window Closed / Lapsed |