Processor of video signal and display unit using the same

• US 6,107,984 A
• Filed: 02/25/1997
• Issued: 08/22/2000
• Est. Priority Date: 03/08/1996
• Status: Expired due to Term

• Current Assignee: Hitachi Maxell Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Hibara, Akira, Maruyama, Atsushi, Yamamoto, Kiyoshi, Urata, Hiroyuki, Naka, Kazutaka
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): Said, Mansour M.
• Application Number:
  US08/805,730
• Time in Patent Office: 1,274 Days
• Field of Search: 345/1, 345/213, 345/132, 345/327, 345/99, 345/98, 345/100
• US Class Current: 345/99
• CPC Class Codes: G06F 3/1446 display composed of modules, e.g. video walls
• CPC Class Codes: G09G 1/16 the pattern of rectangular co-ordinates extending over the whole area of the screen, i.e. television type raster
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 5/12 Synchronisation between the display unit and other units, e.g. other display units, video-disc players
• CPC Class Codes: H04N 5/073 for mutually locking plural sources of synchronising signals, e.g. studios or relay stations
• CPC Class Codes: H04N 5/126 whereby the synchronisation signal indirectly commands a frequency generator
• CPC Class Codes: H04N 9/12 Picture reproducers H04N9/11 takes precedence
• CPC Class Codes: H04N 9/3147 Multi-projection systems displays in general H04N9/12; video walls G06F3/1446, G09G2300/026

Abstract

A video signal processor for outputting a video signal based on an output horizontal synchronizing signal and an output vertical synchronizing signal. The processor includes a circuit inputting a reference horizontal synchronizing signal, a circuit inputting a reference vertical synchronizing signal, a circuit generating an output horizontal synchronizing signal having a frequency different from that of the reference horizontal synchronizing signal, and a circuit generating an output vertical synchronizing signal synchronized in phase with the reference vertical synchronizing signal.

Claims

1. A video signal processor for outputting a video signal based on reference synchronizing signals which are independent of an input video signal including an input horizontal synchronizing signal and an input vertical synchronizing signal, comprising:

means for inputting a reference horizontal synchronizing signal;

means for inputting a reference vertical synchronizing signal;

means for generating an output horizontal synchronizing signal having a frequency different from that of said reference horizontal synchronizing signal;

means for generating an output vertical synchronizing signal which is synchronized in phase with said reference vertical synchronizing signal regardless of a value of said input vertical synchronizing signal; and

means for outputting a video signal based on said output horizontal and vertical synchronizing signals.

2. A video signal processor according to claim 1, wherein the means for generating an output horizontal synchronizing signal having a frequency different from that of a reference horizontal synchronizing signal and the means for generating an output vertical synchronizing signal synchronized in phase with a reference vertical synchronizing signal include:

means for generating an output dot clock from the reference horizontal synchronizing signal;

means for generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

means for generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein the product (D·

L) of the frequency division ratio D and the frequency division ratio L becomes a multiple of a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal.

3. A video signal processor according to claim 1, wherein the means for generating an output horizontal synchronizing signal having a frequency different from that of a reference horizontal synchronizing signal and the means for generating an output vertical synchronizing signal synchronized in phase with a reference vertical synchronizing signal include:

means for generating an output dot clock from the reference horizontal synchronizing signal;

means for generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

means for generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal is equal to the product (j·

k) of two natural numbers j and k, the frequency division ratio D is a multiple of j and the frequency division ratio L is a multiple of k.

4. A video signal processor according to claim 1, wherein the means for generating an output vertical synchronizing signal synchronized in phase with a reference vertical synchronizing signal includes:

means for counting output horizontal synchronizing signals; and

means for initializing said count value in synchronization with the reference vertical synchronizing signal.

5. A video signal display apparatus for displaying a video signal based on reference synchronizing signals which are independent from an input video signal including an input horizontal synchronizing signal and an input vertical synchronizing signal,

means for inputting a reference vertical synchronizing signal;

means for inputting a reference horizontal synchronizing signal;

means for scanning a display device horizontally with a frequency different from said reference horizontal synchronizing signal; and

means for scanning the display device vertically in synchronization in phase with said reference vertical synchronizing signal regardless of a value of said input vertical synchronizing signal.

6. A video signal display apparatus according to claim 5, wherein the means for scanning a display device horizontally with a frequency different from that of a reference horizontal synchronizing signal and the means for scanning the display device vertically in synchronization in phase with a reference vertical synchronizing signal include:

means for generating an output dot clock from the reference horizontal synchronizing signal;

means for generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

means for generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein the product (D·

L) of the frequency division ratio D and the frequency division ratio L becomes a multiple of a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal.

7. A video signal display apparatus according to claim 5, wherein the means for scanning a display device vertically in synchronization in phase with said reference vertical synchronizing signal includes:

means for counting output horizontal synchronizing signals; and

means for initializing said count value in synchronization with the reference vertical synchronizing signal.

8. A video signal display apparatus for displaying a video signal, comprising:

means for inputting a reference vertical synchronizing signal;

means for inputting a reference horizontal synchronizing signal;

means for scanning a display device horizontally with a frequency different from said reference horizontal synchronizing signal; and

means for scanning the display device vertically in synchronization in phase with said reference vertical synchronizing signal, wherein the means for scanning a display device horizontally with a frequency different from that of a reference horizontal synchronizing signal and the means for scanning the display device vertically in synchronizing signal include;

means for generating an output dot clock from the reference horizontal synchronizing signal;

means for generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

means for generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal is equal to the product (j·

k) of two natural numbers j and k, the frequency division ratio D is a multiple of j and the frequency division ratio L is a multiple of k.

9. A video signal display apparatus in which a plurality of unit display devices are arranged one-dimensionally or two-dimensionally adjacent to one another, said video signal display apparatus displaying a video signal based on reference synchronizing signals which are independent from an input video signal including an input horizontal synchronizing signal and an input vertical synchronizing signal comprising:

means for generating a reference vertical synchronizing signal;

means for generating a reference horizontal synchronizing signal; and

means for scanning all the unit display devices vertically in synchronization in phase with said reference vertical synchronizing signal regardless of a value of said input vertical synchronizing signal.

10. A video signal display apparatus according to claim 9, wherein the means for scanning vertically unit display device vertically in synchronization in phase with the reference vertical synchronizing signal of said synchronizing signal includes:

means for generating an output dot clock from the reference horizontal synchronizing signal;

means for generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

means for generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein the product (D·

L) of the frequency division ratio D and the frequency division ratio L becomes a multiple of a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal.

11. A video signal display apparatus according to claim 9, further comprising means for scanning a display device horizontally with a frequency different from that of said reference horizontal synchronizing signal in respective unit display devices.

12. A video signal display apparatus according to claim 9, further comprising means for scanning a display device horizontally with frequencies different from that of said reference horizontal synchronizing signal and with two or more different frequencies in respective unit display devices.

13. A video signal display apparatus according to claim 9, wherein the means for scanning all the unit display devices vertically in synchronization in phase with said reference vertical synchronizing signal is provided in each unit display device independently.

14. A video signal display apparatus in which a plurality of unit display devices are arranged one-dimensionally or two-dimensionally adjacent to one another, comprising:

means for generating a reference vertical synchronizing signal;

means for generating a reference horizontal synchronizing signal; and

means for scanning all the unit display devices vertically in synchronization in phase with said reference vertical synchronizing signal, wherein the means for scanning vertically a unit display device vertically in synchronization in phase with the reference vertical synchronizing signal of said synchronizing signal includes;

means for generating an output dot clock from the reference horizontal synchronizing signal;

means for generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

means for generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal is equal to the product (j·

k) of two natural numbers j and k, the frequency division ratio D is a multiple of j and the frequency division ratio L is a multiple of k.

15. A video signal processor for taking a video signal into a memory based on an input horizontal synchronizing signal and an input vertical synchronizing signal and outputting a video signal from the memory based on an output horizontal synchronizing signal and an output vertical synchronizing signal, comprising:

a circuit inputting an input horizontal synchronizing signal;

a circuit inputting an input vertical synchronizing signal;

a circuit inputting a reference horizontal synchronizing signal;

a circuit inputting a reference vertical synchronizing signal;

a circuit generating an output horizontal synchronizing signal having a frequency different from that of said reference horizontal synchronizing signal;

a circuit generating an output vertical synchronizing signal synchronized in phase with said reference vertical synchronizing signal regardless of a value of said input vertical synchronizing signal; and

a circuit outputting a video signal from the memory based on said output horizontal synchronizing signal and output vertical synchronizing signal.

16. A video signal processor according to claim 15, wherein the circuit generating an output horizontal synchronizing signal having a frequency different from that of a reference horizontal synchronizing signal and the circuit generating an output vertical synchronizing signal synchronized in phase with a reference vertical synchronizing signal include:

a circuit generating an output dot clock from the reference horizontal synchronizing signal;

a circuit generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

a circuit generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein the product (D·

L) of the frequency division ratio D and the frequency division ratio L is a multiple of a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal.

17. A video signal processor for taking a video signal into a memory based on an input horizontal synchronizing signal and an input vertical synchronizing signal and outputting a video signal from the memory based on an output horizontal synchronizing signal and an output vertical synchronizing signal, comprising:

a circuit inputting a reference horizontal synchronizing signal;

a circuit inputting a reference vertical synchronizing signal;

a circuit generating an output horizontal synchronizing signal having a frequency different from that of said reference horizontal synchronizing signal;

a circuit generating an output vertical synchronizing signal synchronized in phase with said reference vertical synchronizing signal; and

a circuit outputting a video signal from the memory based on said output horizontal synchronizing signal and output vertical synchronizing signal, wherein the circuit generating an output horizontal synchronizing signal having a frequency different from that of a reference horizontal synchronizing signal and the circuit generating an output vertical synchronizing signal synchronized in phase with a reference vertical synchronizing signal include;

a circuit generating an output dot clock from the reference horizontal synchronizing signal;

a circuit generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D (where D is a natural number); and

a circuit generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein a line number P (wherein P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal is equal to the product (j·

k) of two natural numbers j and k, the frequency division ratio D is a multiple of j and the frequency division ratio L is a multiple of k.

18. A video signal processor for outputting a video signal based on an output horizontal synchronizing signal and an output vertical synchronizing signal, comprising:

means for inputting a reference horizontal synchronizing signal;

means for inputting a reference vertical synchronizing signal;

means for generating an output horizontal synchronizing signal having a frequency non-integral multiple times different from that of said reference horizontal synchronizing signal;

means for generating an output vertical synchronizing signal which is synchronized in phase with said reference vertical synchronizing signal;

wherein the means for generating an output horizontal synchronizing signal having a frequency non-integral multiple times different from that of a reference horizontal synchronizing signal and the means for generating an output vertical synchronizing signal synchronized in phase with a reference vertical synchronizing signal include;

means for generating an output dot clock from the reference horizontal synchronizing signal;

means for generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

means for generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein the product (D·

L) of the frequency division ratio D and the frequency division ratio L becomes a multiple of a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal.

19. A video signal processor for outputting a video signal based on an output horizontal synchronizing signal and an output vertical synchronizing signal, comprising:

means for inputting a reference horizontal synchronizing signal;

means for inputting a reference vertical synchronizing signal;

means for generating an output horizontal synchronizing signal having a frequency non-integral multiple times different from that of said reference horizontal synchronizing signal;

means for generating an output vertical synchronizing signal which is synchronized in phase with said reference vertical synchronizing signal, wherein the means for generating an output horizontal synchronizing signal having a frequency non-integral multiple times different from that of a reference horizontal synchronizing signal and the means for generating an output vertical synchronizing signal synchronized in phase with a reference vertical synchronizing signal include;

means for generating an output dot clock from the reference horizontal synchronizing signal;

means for generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

means for generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal is equal to the product (j·

k) of two natural numbers j and k, the frequency division ratio D is a multiple of j and the frequency division ratio L is a multiple of k.

20. A video signal display apparatus for displaying a video signal based on an output horizontal synchronizing signal and an output vertical synchronizing signal, comprising:

means for inputting a reference vertical synchronizing signal;

means for inputting a reference horizontal synchronizing signal;

means for scanning a display device horizontally with a frequency non-integral multiple times different from said reference horizontal synchronizing signal; and

means for scanning the display device vertically in synchronization in phase with said reference vertical synchronizing signal, wherein the means for scanning a display device horizontally with a frequency non-integral multiple times different from that of a reference horizontal synchronizing signal and the means for scanning the display device vertically in synchronization in phase with a reference vertical synchronizing signal include;

means for generating an output dot clock from the reference horizontal synchronizing signal;

means for generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

means for generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein the product (D·

L) of the frequency division ratio D and the frequency division ratio L becomes a multiple of a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal.

21. A video signal display apparatus for displaying a video signal based on an output horizontal synchronizing signal and an output vertical synchronizing signal, comprising:

means for inputting a reference vertical synchronizing signal;

means for inputting a reference horizontal synchronizing signal;

means for scanning a display device horizontally with a frequency non-integral multiple times different from said reference horizontal synchronizing signal; and

means for scanning the display device vertically in synchronization in phase with said reference vertical synchronizing signal, wherein the means for scanning a display device horizontally with a frequency non-multiple times different from that of a reference horizontal synchronizing signal and the means for scanning the display device vertically in synchronization in phase with a reference vertical synchronizing signal include;

means for generating an output dot clock from the reference horizontal synchronizing signal;

means for generating an output horizontal synchronizing signal based on a signal obtained from said output dot clock by dividing the frequency thereof by a frequency division ratio D where D is a natural number; and

means for generating an output vertical synchronizing signal based on a signal obtained from said output horizontal synchronizing signal by dividing the frequency thereof by a frequency division ratio L where L is a natural number;

wherein a line number P (where P is a natural number) of a reference signal source for generating the reference horizontal synchronizing signal and the reference vertical synchronizing signal is equal to the product (j·

k) of two natural numbers j and k, the frequency division ratio d is a multiple of j and the frequency division ratio L is a multiple of k.