Patent US7414608B2 successfully refreshed from Google Patents.
US7414608B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image display apparatus and image display method
Assignee: Panasonic Holdings Corp
•
Filing: 2004-05-04
•
Granted: 2008-08-19
•
Expires: 2024-05-04
Abstract
Abstract An image display apparatus and method provided for visually improving a sense of contrast by adjusting contrast and a light source to have a correlation. A characteristics detection part detects MAX, MIN, and APL (average) of an input signal. A control data generation part calculates Gain for amplifying a difference between MAX and MIN to a width of a dynamic range and Offset indicating the DC level to be shifted so that the input video signal amplified by Gain falls within the output dynamic range of a DC level adjustment part. A signal amplitude adjustment part amplifies the input video signal with reference to APL and in accordance with Gain. The DC level adjustment part shifts the DC level of the amplified input video signal in accordance with a value of Offset. A light source control part controls a light source so that a visual brightness level on a screen is equal to a brightness level of the input video signal.
Inventors
- 👤 Taro Funamoto
- 👤 Wataru Machidori
- 👤 Takahiro Kobayashi
- 👤 Yoshihito Ota
- 👤 Katsuyuki Arimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:52
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3406; G06; G06F; G06F3/00; G06F3/14; G09G2320/00; G09G2320/02; G09G2320/0238; G09G2320/0247; G09G2320/0271; G09G2320/0276; G09G2320/06; G09G2320/0626; G09G2320/0646; G09G2320/0653; G09G2320/066; G09G2320/10; G09G2320/103; G09G2330/00; G09G2330/02; G09G2330/021; G09G2340/00; G09G2340/10; G09G2360/00; G09G2360/14; G09G2360/145; G09G2360/16; G09G3/342; G09G3/3426
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
255 words
An image display apparatus for displaying an input video signal on a passive light modulation part including a light source, said apparatus comprising: an input signal processing part for amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level, a characteristics detection part for detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and a control data generation part for calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein said input signal processing part is operable to adjust the amplitude and DC level of said input video signal in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level, said passive light modulation part and said input signal processing part are interconnected such that a video signal outputted from said input signal processing part is inputted to said passive light modulation part, and said image display apparatus is operable to adjust a brightness of said light source such that an average brightness level of a screen is equal to an average brightness level of said input video signal.
Claim 2
Dependent Claim
255 words
An image display apparatus for displaying an input video signal on a passive light modulation part including a light source, said apparatus comprising: an input signal processing part for amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level, a characteristics detection part for detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and a control data generation part for calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein said input signal processing part is operable to adjust the amplitude and DC level of said input video signal in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level, said passive light modulation part and said input signal processing part are interconnected such that a video signal outputted from said input signal processing part is inputted to said passive light modulation part, and said image display apparatus is operable to adjust a brightness of said light source such that an average brightness level of a screen is equal to an average brightness level of said input video signal.
Claim 3
Dependent Claim
285 words
An image display apparatus for displaying an input video signal on a passive light modulation part including a light source, said apparatus comprising: an input signal processing part for amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level, a characteristics detection part for detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and a control data generation part for calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein said input signal processing part is operable to adjust the amplitude and DC level of said input video signal in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level, and said image display apparatus is operable to adjust a brightness of said light source by reducing a difference between a visual average brightness level of a video signal outputted from said input signal processing part and inputted and displayed on said passive light modulation part and a visual average brightness level of the input video signal, which has not been processed by said input signal processing part, displayed on a screen of said passive light modulation part, such that an average brightness level of said screen is equal to an average brightness level of said input video signal.
Claim 4
Dependent Claim
285 words
An image display apparatus for displaying an input video signal on a passive light modulation part including a light source, said apparatus comprising: an input signal processing part for amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level, a characteristics detection part for detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and a control data generation part for calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein said input signal processing part is operable to adjust the amplitude and DC level of said input video signal in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level, and said image display apparatus is operable to adjust a brightness of said light source by reducing a difference between a visual average brightness level of a video signal outputted from said input signal processing part and inputted and displayed on said passive light modulation part and a visual average brightness level of the input video signal, which has not been processed by said input signal processing part, displayed on a screen of said passive light modulation part, such that an average brightness level of said screen is equal to an average brightness level of said input video signal.
Claim 5
Dependent Claim
224 words
An image display method of displaying an input video signal on a passive light modulation part including a light source, said method comprising: amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level; inputting a video signal to said passive light modulation part, said video signal being obtained as a result of said amplifying of said input video signal; adjusting a brightness of said light source such that an average brightness level of a screen is equal to an average brightness level of said input video signal; detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein in said amplifying of said input video signal, the amplitude and DC level of said input video signal are adjusted in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 6
Dependent Claim
224 words
An image display method of displaying an input video signal on a passive light modulation part including a light source, said method comprising: amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level; inputting a video signal to said passive light modulation part, said video signal being obtained as a result of said amplifying of said input video signal; adjusting a brightness of said light source such that an average brightness level of a screen is equal to an average brightness level of said input video signal; detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein in said amplifying of said input video signal, the amplitude and DC level of said input video signal are adjusted in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 7
Dependent Claim
268 words
An image display method of displaying an input video signal on a passive light modulation part including a light source, said method comprising: amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level; adjusting a brightness of said light source by reducing a difference between a visual average brightness level of a video signal obtained as a result of said amplifying of said input video signal and inputted and displayed on said passive light modulation part and a visual average brightness level of the input video signal, which has not been processed by said amplifying of said input video signal, displayed on a screen of said passive light modulation part, such that an average brightness level of said screen is equal to an average brightness level of said input video signal; detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein in said amplifying of said input video signal, the amplitude and DC level of said input video signal are adjusted in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 8
Dependent Claim
268 words
An image display method of displaying an input video signal on a passive light modulation part including a light source, said method comprising: amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level; adjusting a brightness of said light source by reducing a difference between a visual average brightness level of a video signal obtained as a result of said amplifying of said input video signal and inputted and displayed on said passive light modulation part and a visual average brightness level of the input video signal, which has not been processed by said amplifying of said input video signal, displayed on a screen of said passive light modulation part, such that an average brightness level of said screen is equal to an average brightness level of said input video signal; detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein in said amplifying of said input video signal, the amplitude and DC level of said input video signal are adjusted in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 9
Dependent Claim
261 words
An image display apparatus for displaying an input video signal on a passive light modulation part including a light source, said apparatus comprising: an input signal processing part amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level, wherein: said passive light modulation part and said input signal processing part are interconnected such that a video signal outputted from said input signal processing part is inputted to said passive light modulation part, and said image display apparatus is operable to adjust a brightness of said light source by reducing an amount of variation in a visual average brightness level of said input video signal caused by an operation of said input signal processing part; a characteristics detection part for detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and a control data generation part for calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein said input signal processing part is operable to adjust the amplitude and DC level of said input video signal in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 10
Dependent Claim
261 words
An image display apparatus for displaying an input video signal on a passive light modulation part including a light source, said apparatus comprising: an input signal processing part amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level, wherein: said passive light modulation part and said input signal processing part are interconnected such that a video signal outputted from said input signal processing part is inputted to said passive light modulation part, and said image display apparatus is operable to adjust a brightness of said light source by reducing an amount of variation in a visual average brightness level of said input video signal caused by an operation of said input signal processing part; a characteristics detection part for detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and a control data generation part for calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein said input signal processing part is operable to adjust the amplitude and DC level of said input video signal in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 11
Dependent Claim
261 words
An image display apparatus for displaying an input video signal on a passive light modulation part including a light source, said apparatus comprising: an input signal processing part for amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level, wherein said image display apparatus is operable to adjust a brightness of said light source by reducing a difference between a visual average brightness level of a video signal outputted from said input signal processing part and inputted and displayed on said passive light modulation part and a visual average brightness level of the input video signal, which has not been processed by said input signal processing part, displayed on said passive light modulation part; a characteristics detection part for detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and a control data generation part for calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein said input signal processing part is operable to adjust the amplitude and DC level of said input video signal in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 12
Dependent Claim
261 words
An image display apparatus for displaying an input video signal on a passive light modulation part including a light source, said apparatus comprising: an input signal processing part for amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level, wherein said image display apparatus is operable to adjust a brightness of said light source by reducing a difference between a visual average brightness level of a video signal outputted from said input signal processing part and inputted and displayed on said passive light modulation part and a visual average brightness level of the input video signal, which has not been processed by said input signal processing part, displayed on said passive light modulation part; a characteristics detection part for detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and a control data generation part for calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein said input signal processing part is operable to adjust the amplitude and DC level of said input video signal in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 13
Dependent Claim
229 words
An image display method of displaying an input video signal on a passive light modulation part including a light source, said method comprising: amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level; inputting a video signal to said passive light modulation part, said video signal being obtained as a result of said amplifying of said input video signal; adjusting a brightness of said light source by reducing an amount of variation in a visual average brightness level of said input video signal caused by said amplifying of said input video signal; detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein: in said amplifying of said input video signal, the amplitude and DC level of said input video signal are adjusted in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 14
Dependent Claim
229 words
An image display method of displaying an input video signal on a passive light modulation part including a light source, said method comprising: amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level; inputting a video signal to said passive light modulation part, said video signal being obtained as a result of said amplifying of said input video signal; adjusting a brightness of said light source by reducing an amount of variation in a visual average brightness level of said input video signal caused by said amplifying of said input video signal; detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein: in said amplifying of said input video signal, the amplitude and DC level of said input video signal are adjusted in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 15
Dependent Claim
244 words
An image display method of displaying an input video signal on a passive light modulation part including a light source, said method comprising: amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level; adjusting a brightness of said light source by reducing a difference between a visual average brightness level of a video signal obtained as a result of said amplifying of said input video signal and inputted and displayed on said passive light modulation part and a visual average brightness level of the input video signal, which has not been processed in said amplifying of said input video signal, displayed on said passive light modulation part; detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein: in said amplifying of said input video signal, the amplitude and DC level of said input video signal are adjusted in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
Claim 16
Dependent Claim
244 words
An image display method of displaying an input video signal on a passive light modulation part including a light source, said method comprising: amplifying said input video signal so as to increase a difference between a maximum brightness level and a minimum brightness level; adjusting a brightness of said light source by reducing a difference between a visual average brightness level of a video signal obtained as a result of said amplifying of said input video signal and inputted and displayed on said passive light modulation part and a visual average brightness level of the input video signal, which has not been processed in said amplifying of said input video signal, displayed on said passive light modulation part; detecting a maximum brightness level, a minimum brightness level, and an average brightness level of said input video signal; and calculating a gain for signal amplitude adjustment and a shift amount of a DC level, said gain for signal amplitude adjustment being for increasing a difference between said maximum brightness level and said minimum brightness level to a dynamic range with reference to said average brightness level, and said shift amount of a DC level being for allowing said input video signal to fall within said dynamic range, wherein: in said amplifying of said input video signal, the amplitude and DC level of said input video signal are adjusted in accordance with said gain for signal amplitude adjustment and said shift amount of a DC level.
References Cited (Backward Citations)
JPS6219835A
Cited
US5313292A
Cited
JPH01136127A
Cited
JPH01239589A
Cited
JPH0228184U
Cited
JPH02261267A
Cited
JPH02311818A
Cited
JPH0488697U
Cited
JPH0566501A
Cited
JPH05127608A
Cited
US5406305A
Cited
US6388649B1
Cited
JPH07130477A
Cited
US5717422A
Cited
CA2146060A1
Cited
JPH08201812A
Cited
US6111559A
Cited
JPH1165531A
Cited
JPH11109317A
Cited
US6414664B1
Cited
US6384809B1
Cited
US6388388B1
Cited
US20030146919A1
Cited
US7053881B2
Cited
US7064740B2
Cited
US20040008177A1
Cited
US7113164B1
Cited
US20040257329A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2011-08-19 | 2012-02-18 | 2012-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2015-08-19 | 2016-02-18 | 2016-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2019-08-19 | 2020-02-18 | 2020-08-19 | $7700.00 | Window Closed / Lapsed |