Patent US5227882A successfully refreshed from Google Patents.
US5227882A
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US
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Video display apparatus including display device having fixed two-dimensional pixel arrangement
Assignee: Sharp Corp
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Filing: 1991-09-25
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Granted: 1993-07-13
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Expires: 2011-09-25
Abstract
Abstract A video display apparatus includes an LCD device of the active matrix type and an image memory having an arrangement and storage capacity corresponding to the two-dimensional pixel arrangement thereof. A necessary processing such as conversion of the number of scanning lines, time-base companding in the horizontal direction and so on is applied to the inputted video signal according to the format thereof and then the inputted video signal is written into the two-dimensional arrangement of the image memory. The data written into the image memory is read out by a clock of a fixed frequency within a period shorter than the writing period asynchronously with the writing operation. Then, the LCD is driven by the read data and an image is displayed on the pixel arrangement.
Inventors
- 👤 Naoki Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:46
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0117; H04N7/0122; G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G09G2310/00; G09G2310/02; G09G2310/0202; G09G2310/0205; G09G2310/0224; G09G2320/00; G09G2320/02; G09G2320/0271; G09G2320/0276; G09G2340/00; G09G2340/04; G09G2340/0407; G09G2340/0414; G09G2340/0421; G09G2340/0442; G09G2360/00; G09G2360/02
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
273 words
A video display apparatus comprising: a display device having a fixed two-dimensional pixel arrangement; an image memory capable of storing a video signal with a two-dimensional arrangement corresponding the two-dimensional pixel arrangement of said display device and capable of asynchronous writing and reading operations; receiving means for selectively receiving a video signal to be displayed among video signals of a plurality of formats; extracting means for extracting horizontal and vertical synchronizing signals from said received video signal; first clock generating means for generating at least one kind of clock having a phase synchronous with that of said extracted horizontal synchronizing signal and having a frequency selected according to the format of said received video signal; processing and writing means for processing said received video signal in response to said clock and writing said video signal into said image memory so as to place an effective display region of said video signal within the two-dimensional pixel arrangement of said image memory; second clock generating means for generating a clock of a fixed frequency; reading means triggered by said extracted vertical synchronizing signal for reading the contents of said image memory within a fixed period in response to the clock of said fixed frequency asynchronously with the writing operation, said fixed period in which the contents of said image memory are read out is set shorter than the shortest one among the vertical periods of said video signals of the plurality of formats; and driving means for driving the display device so as to display an image on the two-dimensional pixel arrangement of said display device according to said read contents of the image memory.
Claim 2
Dependent Claim
273 words
A video display apparatus comprising: a display device having a fixed two-dimensional pixel arrangement; an image memory capable of storing a video signal with a two-dimensional arrangement corresponding the two-dimensional pixel arrangement of said display device and capable of asynchronous writing and reading operations; receiving means for selectively receiving a video signal to be displayed among video signals of a plurality of formats; extracting means for extracting horizontal and vertical synchronizing signals from said received video signal; first clock generating means for generating at least one kind of clock having a phase synchronous with that of said extracted horizontal synchronizing signal and having a frequency selected according to the format of said received video signal; processing and writing means for processing said received video signal in response to said clock and writing said video signal into said image memory so as to place an effective display region of said video signal within the two-dimensional pixel arrangement of said image memory; second clock generating means for generating a clock of a fixed frequency; reading means triggered by said extracted vertical synchronizing signal for reading the contents of said image memory within a fixed period in response to the clock of said fixed frequency asynchronously with the writing operation, said fixed period in which the contents of said image memory are read out is set shorter than the shortest one among the vertical periods of said video signals of the plurality of formats; and driving means for driving the display device so as to display an image on the two-dimensional pixel arrangement of said display device according to said read contents of the image memory.
Claim 3
Dependent Claim
32 words
The video display apparatus according to claim 1, wherein said image memory has an arrangement and storage capacity corresponding to said two-dimensional pixel arrangement for each video component constituting each video signal.
Claim 4
Dependent Claim
29 words
The video display apparatus according to claim 1, wherein the relative phase relationship of the start. between the asynchronous writing and reading operations of said image memory is fixed.
Claim 5
Dependent Claim
22 words
The video display apparatus according to claim 1, further comprising format determining means for determining the format of the received video signal.
Claim 6
Dependent Claim
39 words
The video display apparatus according to claim 4, wherein said processing and writing means includes means for writing said received video signal directly into said image memory according to the result of the determination by said format determining means.
Claim 7
Dependent Claim
46 words
The video display apparatus according to claim 4, wherein said processing and writing means includes means for performing scanning line number conversion and time-base companding in the horizontal direction of said received video signal according to the result of the determination by said format determining means.
Claim 8
Dependent Claim
48 words
The video display apparatus according to claim 6, wherein said conversion of the number of scanning lines and time-base companding in the horizontal direction are performed by writing and reading the video signal into/from a line memory using a plurality of clocks having periods of a prescribed ratio.
Claim 9
Dependent Claim
29 words
The video display apparatus according to claim 1, wherein said reading means includes means for applying a fixed signal processing to the video signal read from said image memory.
Claim 10
Dependent Claim
16 words
The video display apparatus according to claim 1, wherein said display device comprises an LCD device.
Claim 11
Dependent Claim
21 words
The video display apparatus according to claim 9, wherein said LCD device comprises an LCD device of an active matrix type.
Claim 12
Dependent Claim
261 words
A video display apparatus comprising: a display device having a fixed two-dimensional pixel arrangement; an image memory capable of storing a video signal with a two-dimensional arrangement corresponding to the two-dimensional pixel arrangement of said display device and capable of asynchronous writing and reading operations; receiving means for selectively receiving a video signal to be displayed among video signals of a plurality of formats; extracting means for extracting horizontal and vertical synchronizing signals from said received video signal; first clock generating means for generating at least one kind of clock having the phase synchronous with that of said extracted horizontal synchronizing signal and having a frequency selected according to the format of said received video signal; processing and writing means for processing said received video signal in response to said clock and writing said video signal into said image memory so as to place an effective display region of said video signal within the two-dimensional pixel arrangement of said image memory; second clock generating means for generating a clock of a fixed frequency; reading means triggered by said extracted vertical synchronizing signal for reading the contents of said image memory within a fixed period in response to the clock of said fixed frequency asynchronously with the writing operation, said reading means including applying means for applying a fixed signal processing to the video signal read from said image memory; and driving means for driving the display device so as to display an image on the two-dimensional pixel arrangement of said display device according to said read contents of the image memory.
Claim 13
Dependent Claim
261 words
A video display apparatus comprising: a display device having a fixed two-dimensional pixel arrangement; an image memory capable of storing a video signal with a two-dimensional arrangement corresponding to the two-dimensional pixel arrangement of said display device and capable of asynchronous writing and reading operations; receiving means for selectively receiving a video signal to be displayed among video signals of a plurality of formats; extracting means for extracting horizontal and vertical synchronizing signals from said received video signal; first clock generating means for generating at least one kind of clock having the phase synchronous with that of said extracted horizontal synchronizing signal and having a frequency selected according to the format of said received video signal; processing and writing means for processing said received video signal in response to said clock and writing said video signal into said image memory so as to place an effective display region of said video signal within the two-dimensional pixel arrangement of said image memory; second clock generating means for generating a clock of a fixed frequency; reading means triggered by said extracted vertical synchronizing signal for reading the contents of said image memory within a fixed period in response to the clock of said fixed frequency asynchronously with the writing operation, said reading means including applying means for applying a fixed signal processing to the video signal read from said image memory; and driving means for driving the display device so as to display an image on the two-dimensional pixel arrangement of said display device according to said read contents of the image memory.
Claim 14
Independent Claim
299 words
A method for displaying video signals of a plurality of formats on a display device having a fixed two-dimensional pixel arrangement, comprising the steps of: (a) storing a video signal with a two-dimensional arrangement corresponding to the two-dimensional pixel arrangement of the display device in an image memory which is capable of asynchronous writing and reading operations; (b) selectively receiving a video signal to be displayed from among the video signals of the plurality of formats; (c) extracting horizontal and vertical synchronizing signals from said video signal received at said step (b); (d) generating at least one kind of clock having a phase synchronous with that of said horizontal synchronizing signal extracted at said step (c) and having a frequency selected according to the format of said video signal received at said step (b); (e) processing said video signal received at said step (b) in response to said clock generated at said step (d); (f) writing said video signal processed at said step (e) into said image memory so as to place an effective display region of said video signal within the two-dimensional pixel arrangement of said image memory; (g) generating a clock of a fixed frequency; (h) reading the contents of said image memory, triggered by said vertical synchronizing signal extracted at said step (c), within a fixed period in response tot he clock of said fixed frequency asynchronously with the writing operation; (i) setting said fixed period in which the contents of said image memory are read out shorter than the shortest one among the vertical periods of the video signals of the plurality of formats; and (j) driving the display device so as to display an image on the two-dimensional pixel arrangement of the display device according to the contents read out of said image memory.
Claim 15
Independent Claim
299 words
A method for displaying video signals of a plurality of formats on a display device having a fixed two-dimensional pixel arrangement, comprising the steps of: (a) storing a video signal with a two-dimensional arrangement corresponding to the two-dimensional pixel arrangement of the display device in an image memory which is capable of asynchronous writing and reading operations; (b) selectively receiving a video signal to be displayed from among the video signals of the plurality of formats; (c) extracting horizontal and vertical synchronizing signals from said video signal received at said step (b); (d) generating at least one kind of clock having a phase synchronous with that of said horizontal synchronizing signal extracted at said step (c) and having a frequency selected according to the format of said video signal received at said step (b); (e) processing said video signal received at said step (b) in response to said clock generated at said step (d); (f) writing said video signal processed at said step (e) into said image memory so as to place an effective display region of said video signal within the two-dimensional pixel arrangement of said image memory; (g) generating a clock of a fixed frequency; (h) reading the contents of said image memory, triggered by said vertical synchronizing signal extracted at said step (c), within a fixed period in response tot he clock of said fixed frequency asynchronously with the writing operation; (i) setting said fixed period in which the contents of said image memory are read out shorter than the shortest one among the vertical periods of the video signals of the plurality of formats; and (j) driving the display device so as to display an image on the two-dimensional pixel arrangement of the display device according to the contents read out of said image memory.
Claim 16
Dependent Claim
34 words
The method for displaying video signals according to claim 12, wherein said image memory has an arrangement and storage capacity corresponding to the two-dimensional pixel arrangement for each video component constituting each video signal.
Claim 17
Dependent Claim
34 words
The method for displaying video signals according to claim 13, further comprising the step of fixing the relative phase relationship of the start between the asynchronous writing and reading operations of said image memory.
Claim 18
Dependent Claim
27 words
The method for displaying video signals according to claim 12, further comprising the step of determining the format of said video signal received at said step (b).
Claim 19
Dependent Claim
52 words
The method for displaying video signals according to claim 15, wherein said step (f) further includes the step of writing said video signal received at said step (b) into said image memory according to the result of said step of determining the format of said video signal received at said step (b).
Claim 20
Dependent Claim
60 words
The method for displaying video signals according to claim 15, wherein said step (f) further includes the step of performing scanning line number conversion and time-base companding in the horizontal direction of said video signal received at said step (b) according to the result of said step of determining the format of said video signal received at said step (b).
Claim 21
Dependent Claim
52 words
The method for displaying video signals according to claim 17, wherein the conversion of the number of scanning lines and time-base companding in the horizontal direction are performed by writing and reading the video signal into and from a line memory using a plurality of clocks having periods of a prescribed ratio.
Claim 22
Dependent Claim
18 words
The method for displaying video signals according to claim 12, wherein the display device comprises an LCD device.
Claim 23
Independent Claim
280 words
A method for displaying video signals of a plurality of formats on a display device having a fixed two-dimensional pixel arrangement, comprising the steps of: (a) storing a video signal with a two-dimensional arrangement corresponding to the two-dimensional pixel arrangement of the display device in an image memory which is capable of asynchronous writing and reading operations; (b) selectively receiving a video signal to be displayed from among the video signals of the plurality of formats; (c) extracting horizontal and vertical synchronizing signals from said video signal received at said step (b); (d) generating at least one kind of clock having a phase synchronous with that of said horizontal synchronizing signal extracted at said step (c) and having a frequency selected according to the format of said video signal received at said step (b); (e) processing said video signal received at said step (b) in response to said clock generated at said step (d); (f) writing said video signal processed at said step (e) into said image memory so as to place an effective display region of said video signal within the two-dimensional pixel arrangement of said image memory; (g) generating a clock of a fixed frequency; (h) reading the contents of said image memory, triggered by said vertical synchronizing signal extracted at said step (c), within a fixed period in response to the clock of said fixed frequency asynchronously with the writing operation; (i) applying a fixed signal processing to the video signal read from said image memory; and (j) driving the display device so as to display an image on the two-dimensional pixel arrangement of the display device according to the contents read out of said image memory.
Claim 24
Independent Claim
280 words
A method for displaying video signals of a plurality of formats on a display device having a fixed two-dimensional pixel arrangement, comprising the steps of: (a) storing a video signal with a two-dimensional arrangement corresponding to the two-dimensional pixel arrangement of the display device in an image memory which is capable of asynchronous writing and reading operations; (b) selectively receiving a video signal to be displayed from among the video signals of the plurality of formats; (c) extracting horizontal and vertical synchronizing signals from said video signal received at said step (b); (d) generating at least one kind of clock having a phase synchronous with that of said horizontal synchronizing signal extracted at said step (c) and having a frequency selected according to the format of said video signal received at said step (b); (e) processing said video signal received at said step (b) in response to said clock generated at said step (d); (f) writing said video signal processed at said step (e) into said image memory so as to place an effective display region of said video signal within the two-dimensional pixel arrangement of said image memory; (g) generating a clock of a fixed frequency; (h) reading the contents of said image memory, triggered by said vertical synchronizing signal extracted at said step (c), within a fixed period in response to the clock of said fixed frequency asynchronously with the writing operation; (i) applying a fixed signal processing to the video signal read from said image memory; and (j) driving the display device so as to display an image on the two-dimensional pixel arrangement of the display device according to the contents read out of said image memory.
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |