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1. 发明专利

JPH11338450A IMAGE DISPLAY DEVICE 失效
公开(公告)号：JPH11338450A
公开(公告)日：1999-12-10
申请号：JP14082698
申请日：1998-05-22
申请人： HITACHI LTD
发明人： SANO TAKESHI
IPC分类号： G09G5/00 , G09G5/14 , H04N5/45
摘要： PROBLEM TO BE SOLVED: To reduce the amount of memory used and to restrain degradation of image quality by varying the clock frequency according to the display size of a subdisplay, lowering the clock frequency in the case of a small display size, and roughly fetching data. SOLUTION: A sampling means 11 samples a picture signal of a subdisplay by a sampling clock from a sampling clock generating means 17 to be output to a memory means 12. An image converting means 13 displays image data of the memory means 12 through a picture switch SW14 by an image display means 15. A size recognizing means 16 obtains a horizontal size ratio of both from the connecting time of the picture switch SW to the master display side and the subdisplay side during one horizontal period, and according to the ratio, the sampling clock means 17 outputs sampling clock frequency to the sampling means 11 and the image converting means 13. By a low-frequency sampling clock, a picture signal for a subdisplay is sampled to reduce the data quantity and restrain degradation of an image.

2. 发明专利

JPH11220654A PICTURE DISPLAY DEVICE 失效
公开(公告)号：JPH11220654A
公开(公告)日：1999-08-10
申请号：JP2171398
申请日：1998-02-03
申请人： HITACHI LTD
发明人： SANO TAKESHI
IPC分类号： H04N5/265
摘要： PROBLEM TO BE SOLVED: To reduce the use quantity of a memory and to suppress the deterioration of picture quality by taking in a clock frequency to be low and data to be coarse when a display size is small. SOLUTION: A means 11 sampling a video signal samples the video signal of a slave screen and outputs it to a memory means 12 based on a sampling clock. A picture conversion means 13 outputs/displays picture data which are read to a picture display means 15 through a video switch SW14. A size recognition means 16 obtains the horizontal size ratio of a master screen and the slave screen and outputs it to a sampling clock generation means 17. The sampling clock generation means 17 frequency-divides the frequency of the sampling clock becoming a base into 50%, 30% and 10% and outputs them to the sampling means 11 and the picture conversion means 13 when the horizontal sizes of the slave screens are 50%, 30% and 10% of the master screen, for example. The slave screen video signal is sampled with the sampling clock of the low frequency which is frequency-divided.

3. 发明专利

JPH08254970A DISPLAY DEVICE 失效
公开(公告)号：JPH08254970A
公开(公告)日：1996-10-01
申请号：JP5747395
申请日：1995-03-16
申请人： HITACHI LTD
发明人： TSURUGA SADAO , ARAI IKUYA , MASUDA KOZO , KAWASAKI JIRO , SANO TAKESHI , NAGABAYASHI TAMOTSU
IPC分类号： H04N5/06 , G09G1/16 , G09G5/12 , G09G5/18
摘要： PURPOSE: To display good video even in the case of inputting an input signal including phase- and frequency jitters. CONSTITUTION: A clock generating part 30 at readout side selects a clock synchronized with an input signal when the input signal is stable, and selects a stable clock generated asynchronously with the input signal when the input signals are unstable, and outputs the clock as readout side clock, to display a good video even in the case of inputting an input signal including phase- and frequency jitters.

4. 发明专利

JPH08123350A DISPLAY DEVICE 失效
公开(公告)号：JPH08123350A
公开(公告)日：1996-05-17
申请号：JP25832194
申请日：1994-10-24
申请人： HITACHI LTD
发明人： TSURUGA SADAO , ARAI IKUYA , MASUDA KOZO , KAWASAKI JIRO , SANO TAKESHI , NAGABAYASHI TAMOTSU
IPC分类号： H04N5/68 , G09G1/16 , H04N3/16
摘要： PURPOSE: To handle a video signal with extremely wide range of scanning frequency and to perform display with the optimum luminance corresponding to the video signal by suppressing a part to be adjusted from increasing. CONSTITUTION: This device comprises a scan converter 1 to which input video signals 100 and input synchronizing signals 200 with various kinds of standard are inputted and which converts them to desired signals of horizontal and vertical scanning line frequencies, a video processing circuit 20 which inputs an output video signal 400 from the scan converter 1 and performs processing such as bright control, contrast control, etc., a variable gain video output circuit 26 which inputs the output signal of the video processing circuit 20 and amplifies it to signal voltage amplitude by which a picture tube (CRT) 4 can be driven and moreover, varies a gain by a control signal from the scan converter 1, a deflection circuit 3 which inputs an output synchronizing signal from the scan converter 1, and the picture tube (CRT) 4.

5. 发明专利

JPH10308897A IMAGE DISPLAY DEVICE 失效
公开(公告)号：JPH10308897A
公开(公告)日：1998-11-17
申请号：JP11907897
申请日：1997-05-09
申请人： HITACHI LTD
发明人： SANO TAKESHI
IPC分类号： H04N5/265 , H04N5/45
摘要： PROBLEM TO BE SOLVED: To improve compression efficiency and to remarkably reduce the capacity of memory to be used by defining only a section, which has a meaning as image information, as the object of compression. SOLUTION: An image compressing means 12 stops compressing video signals during blanking periods (x) and (z) and compresses video signals just during a display period (y). Compressed image data are held in a memory 13 and sent to an image expanding means 14 just as needed. The image expanding means 14 thaws the image data, reproduces video signals during the display period and outputs them to a synthesizing means 16 later. A blanking generating means 15 generates a blanking signal, which has no image information for a period corresponding to the blanking periods (x) and (z), and outputs it to the synthesizing means 16. The synthesizing means 16 adds together the blanking signal for a length corresponding to the blanking period (x) before the video signal inputted from the image expanding means 14 and the blanking signal for a length corresponding to the blanking period (z) after the video signal and outputs the result through a signal changeover switch 18 onto a display means 17, and a slave picture is displayed.

6. 发明专利

JPH08160928A IMAGE DISPLAY DEVICE 失效
公开(公告)号：JPH08160928A
公开(公告)日：1996-06-21
申请号：JP30634894
申请日：1994-12-09
申请人： HITACHI LTD
发明人： SANO TAKESHI , KITO KOJI , ARAI IKUYA , MASUDA KOZO , TSURUGA SADAO , KAWASAKI JIRO , NAGABAYASHI TAMOTSU
IPC分类号： G09G1/16 , G09G5/00 , G09G5/12 , G09G5/18
摘要： PURPOSE: To automatically generate the best sampling clock for the sampling of a video signal. CONSTITUTION: Image information in specific pattern for clock generation is stored in a memory 4, and prior to a video signal that a video output device 2 generates, the same video signal for clock generation as it is outputted from the video output device 2. A clock frequency control circuit 9 calculates the number of dots in one horizontal scanning period of the output video signal of the video output device 2 and a clock generating circuit 7 is controlled according to the number of dots to generate the sampling clock equal to the dot clock frequency of the video signal. This sampling clock has its phase adjusted by a clock phase varying circuit 6 and a sampling circuit 5 samples the video signal. Then a clock phase control circuit 8 compares the patterns of the image part of the video signal for clock generation and the image information for clock generation in the memory 4 with each other and the clock phase varying circuit 6 controls the phase adjustment quantity.

7. 发明专利

JPH07240854A DISPLAY DEVICE 失效
公开(公告)号：JPH07240854A
公开(公告)日：1995-09-12
申请号：JP3110694
申请日：1994-03-01
申请人： HITACHI LTD
发明人： SANO TAKESHI , NISHIMORI KOJI
IPC分类号： H04N3/28
摘要： PURPOSE:To obtain a video image with high image quality without flicker at all times by selecting a high frequency for the scanning frequency when a frequency of an input signal is low and outputting and displaying video information in matching with a high scanning frequency. CONSTITUTION:A synchronizing signal is sampled in a sampling circuit 1 and stored in a memory A2 as synchronizing signal data. The frequency of the synchronizing signal is counted by counters A6-C8 and a comparator 9 compares the frequency with a frequency A. When the frequency is lower than the frequency A, a signal to select a circuit scanning an image at horizontal and vertical frequencies at a multiple of N is outputted to each changeover switch. Furthermore, on the reception of an interlace scanning signal of 1-frame 2-field, an arithmetic circuit 11 generating an address to call a video image of the 2nd filed in succession to that of a 1st field is selected by an interlace scanning signal identification circuit 10. Furthermore, in this case, the frequency A is set to a frequency at which no flicker is generated.

8. 发明专利

JPH06308900A DISPLAY DEVICE 失效
公开(公告)号：JPH06308900A
公开(公告)日：1994-11-04
申请号：JP9576593
申请日：1993-04-22
申请人： HITACHI LTD
发明人： SANO TAKESHI
IPC分类号： G09G1/16 , H04N7/01
摘要： PURPOSE:To obtain a high quality video without flicker by discriminating the level of frequencies, switching the scanning frequency to a high frequency if the frequency of the input signal is low and outputting video information in accordance with the frequency. CONSTITUTION:Video signals are sampled in a sampling circuit 1 and stored in a memory 2. Synchronization signals are conunted for their frequency in counters 6 and 7 and a comparator 9 compares the counted frequency with a prescribed frequency A. When the counted frequency is lower than the frequency A, a signal, which selects a circuit to scan an image with N times horizontal and vertical frequencies, is outputted to each of changeover switches 12 to 15. By the signal, a clock is selected which calls for video information from the memory 2 to a video output circuit 17 at a speed corresponding to the N times frequency and the video is displayed. When the frequency of the input signal is higher than the frequency A, the changeover switches are switched to deal with the case. By setting the value of the frequency A to a frequency value which does not generate flicker, a high quality video is always obtained.

9. 发明专利

JPH1078771A PICTURE DISPLAY DEVICE 失效
公开(公告)号：JPH1078771A
公开(公告)日：1998-03-24
申请号：JP23491196
申请日：1996-09-05
申请人： HITACHI LTD
发明人： SANO TAKESHI
IPC分类号： G09G1/16 , G09G5/12
摘要： PROBLEM TO BE SOLVED: To reduce generating and adjusting operations of a sampling clock by generating automatically a sampling clock adjusting a specification of an input picture signal. SOLUTION: A picture display device 13 controls various personal computers, EWS and the like, outputs a picture for generating a sampling clock previously decided, data obtained by sampling this picture in the picture display device 13 is compared with a picture for generating a sampling clock, frequencies and phases of a sampling clock and a dot clock can be automatically adjusted by controlling a frequency and a phase of a sampling clock so that the both are coincident. Digital conversion of a video signal can be easily performed by using an obtained sampling clock.

10. 发明专利

JPH09307790A DISPLAY DEVICE 失效
公开(公告)号：JPH09307790A
公开(公告)日：1997-11-28
申请号：JP11730396
申请日：1996-05-13
申请人： HITACHI LTD
发明人： MASUDA KOZO , ARAI IKUYA , WATANABE YASUNORI , SANO TAKESHI
IPC分类号： H04N5/18 , H04N9/73
摘要： PROBLEM TO BE SOLVED: To keep white balance constant at all times even when a bright voltage is changed by inserting a bright voltage as a pulse amplitude to a blanking period of a video signal. SOLUTION: A bright pulse insert circuit 3 adds a bright pulse to an input signal. A video preamplifier 4 amplifies a video signal to which the bright pulse is inserted, then the bright pulse is amplified equally to the case with an input video signal. Similarly the video amplifier amplifies the bright pulse equally to the case with the input video signal. A SYNC tip clamp circuit 7 makes a cathode cut-off voltage match a tip of a bright voltage component of an output signal of a video output amplifier 5 from which a DC component is eliminated by a capacitor 6. Through the operation of each block of the display device, even when a bright voltage is changed, a ratio of G, R, B drive voltages is kept constant at all times, then white balance is unchanged.

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