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公开(公告)号：JP2004007546A
公开(公告)日：2004-01-08
申请号：JP2003100395
申请日：2003-04-03
Applicant: FUJITSU LTD
Inventor： YAMAMOTO AKIRA , TAJIMA MASAYA , UEDA TOSHIO , KURIYAMA HIROHITO , ISHIDA KATSUHIRO , KANAZAWA GIICHI
Abstract: PROBLEM TO BE SOLVED: To provide a waveform generating circuit capable of decreasing a ROM data quantity and generating complicated waveforms. SOLUTION: The waveform generating circuit provided with: a ROM 651 for storing waveform data related to a waveform and its production by each cycle comprising a plurality of clock periods; an address generating circuit 71 for sequentially generating an address signal used to sequentially read waveform data; and a waveform data output circuit 73 for sequentially reproducing the read waveform data into a waveform signal. The waveform data includes extension information and extension period information indicative of an extended period, and the extension period is a period being an integer multiple of a cycle. The waveform generating circuit includes further an extension decision and control circuit 72 that decides the presence / absence of the extension information from the read waveform data, controls the waveform data output circuit to maintain an output of a corresponding waveform signal and controls the address generating circuit to delay the production operation of the address signal when the waveform data includes the extension information. COPYRIGHT: (C)2004,JPO
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公开(公告)号：JPH0968945A
公开(公告)日：1997-03-11
申请号：JP22540895
申请日：1995-09-01
Applicant: FUJITSU LTD
Inventor： KURIYAMA HIROHITO , TAJIMA MASAYA , UEDA TOSHIO , ISHIDA KATSUHIRO , YAMAMOTO AKIRA
IPC: G09G3/28 , G09G3/20 , G09G3/282 , G09G3/288 , G09G3/291 , G09G3/292 , G09G3/294 , G09G3/296 , G09G3/298
Abstract: PROBLEM TO BE SOLVED: To prevent the generation of luminance difference between lines depending upon the amount of display data and to excellently perform multi- level display in an image display device such as a triode type plasma display device for selectively performing emited light display for plural display cells located on the intersection of plural matrix-like electrodes. SOLUTION: When display data are displayed by performing write in discharge in a display cell selected from among plural display cells by either a first electrode or a second electrode and a third electrode and performing sustaining discharge by a pair of the first and the second electrodes, this device is provided with a counting means 7 for display data amount for every line for counting the amount of display data detected for every line, the counted result of the amount of display data by the counting means 7 for every line is compared with the counted result of a sustaining discharge control signal and a number of times of sustaining discharge is controlled for every line based on an enable signal generated at the time of coincidence of both counted results.
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公开(公告)号：JPH08227281A
公开(公告)日：1996-09-03
申请号：JP3232295
申请日：1995-02-21
Applicant: FUJITSU LTD
Inventor： KOIZUMI HARUO , UEDA TOSHIO
Abstract: PURPOSE: To provide a capacitive load driving device driving a capacitive load with less power consumption and capable of also reducing a calorific value. CONSTITUTION: In the capacitive load driving device constituted of the capacitive load 2, a drive circuit 3 driving the capacitive load 2, a current bias circuit 4 controlling the drive circuit 3 and a control signal input part 5 connected to the current bias circuit 4, the device is set in a high impedance state at least in one side period of the period when the potential applied to the capacitive load in before and after the period when the potential applied to the capacitive load becomes low voltage potential becomes high voltage potential.
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公开(公告)号：JPH07152341A
公开(公告)日：1995-06-16
申请号：JP29691093
申请日：1993-11-26
Applicant: FUJITSU LTD
Inventor： FUJISAKI TAKASHI , OTSUKA AKIRA , UEDA TOSHIO , TOMIO SHIGETOSHI , TAJIMA MASAYA
IPC: H04N5/66 , G09G3/20 , G09G3/288 , G09G3/291 , G09G3/293 , G09G3/294 , G09G3/296 , G09G3/30 , H04N5/70 , G09G3/28
Abstract: PURPOSE:To miniaturize a power supply part by effectively controlling the frequency of data pulses impressed on each address electrode and actively controlling address currents flowing through plural lines of address electrodes. CONSTITUTION:This device is provided with an address current detecting means 3 detecting an address current value consumed in the unit of one frame displayed on a planar display device 1, a comparator circuit 4 comparing the address current value detected by the address current detecting means 3 with a prescribed reference value and an address frequency control means 5 controlling the address frequency during the display frame in responce to the output of the comparator circuit 4. At this time, at the time of displaying a prescribed picture, when the address currents flowing through address electrodes 16 are detected always and the address currents exceed a predetermined and prescribed current, address currents are controlled to be lower than a constant value by lowering the frequency of the pixel display data impressed on respective electrodes 16.
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公开(公告)号：JPH05290742A
公开(公告)日：1993-11-05
申请号：JP9135492
申请日：1992-04-13
Applicant: FUJITSU LTD
Inventor： YAO SHINPEI , YOSHIKAWA KAZUO , KAMEYAMA SHIGEKI , UEDA TOSHIO
IPC: G09F9/313 , G09G3/288 , G09G3/296 , G09G3/298 , H01J11/14 , H01J11/18 , H01J11/22 , H01J11/24 , H01J11/26 , H01J11/28 , H01J11/34 , H01J11/36 , H01J11/38 , H01J11/42 , H01J11/44 , H01J11/46 , H01J11/48 , H01J11/00 , H01J11/02
Abstract: PURPOSE:To lessen the size of a plane discharge type plasma display unit and facilitate the drive circuit connection work thereof. CONSTITUTION:The connection portion of scan side electrodes 61-67 and the connection portion of sustain side electrodes 71-77 are formed on the same side of the same board of a plane discharge type plasma display panel 31. Or, the connection portion of the scan side electrodes 61-67 and the connection terminal of a common electrode connected to the connection portion of the sustain side electrodes 71-77 are formed. The electrodes 61-67 and 71-77 of the panel 31 are connected to a scan side electrode drive circuit 14 or a sustain side electrode drive circuit 15 by using a printed wiring wiring board, a flexible wiring sheet 47, and the like.
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Patent Agency Ranking
公开(公告)号：JPH0580710A
公开(公告)日：1993-04-02
申请号：JP24154591
申请日：1991-09-20
Applicant: FUJITSU LTD
Inventor： UEDA TOSHIO , YOSHIKAWA KAZUO , KANEKO KEIICHI , KURIYAMA HIROHITO
Abstract: PURPOSE:To handle the period of an optional synchronizing signal. CONSTITUTION:The driving circuit of the gas discharge panel equipped with a storage means 1 stored with a pulse train signal prescribing a pulse train containing maintaining pulses, a readout start signal output means 2 which outputs a readout start signal once detecting prescribed level variation of the synchronizing signal, a pulse control signal output means 3 which reads the pulse train signal out of the storage means 1 and outputs it each time a readout start signal is generated, and a pulse selecting circuit 4 which inputs at least the pulse train signal and display data and outputs maintaining and extinction pulses for each discharge cell is equipped with a timing coincidence detecting means 5 which outputs a timing coincidence signal once detecting the readout start signal being generated during the continuation of the output of the maintaining pulses; in the pulse control signal output means 3 when the timing coincidence signal is generated, a different pulse train signal which prescribes the maintaining pulses generated at mutually different periods from the maintaining pulses prescribing said pulse train signal is outputted instead of the pulse train signal.
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公开(公告)号：JPH0519714A
公开(公告)日：1993-01-29
申请号：JP17536691
申请日：1991-07-16
Applicant: FUJITSU LTD
Inventor： KURIYAMA HIROHITO , OTSUKA AKIRA , YOSHIKAWA KAZUO , UEDA TOSHIO
Abstract: PURPOSE:To prevent crosstalk from being generated by bisecting drivers for scanning lines and drivers for address lines and supplying signals to the latter drivers through delay circuits and putting them in partial charge of a load. CONSTITUTION:The drivers 24 and 25 for the scanning lines are divided into 1st scanning line drivers 24a and 25a and 2nd scanning line drivers 24b and 25b and the drivers 22 and 23 for the address lines are divided into 1st address line drivers 22a and 23a and 2nd address line drivers 22b and 23b. Further, the 1st delay circuit 27 is provided between a timing generator 26 and the 2nd scanning line drivers 24b and 25b and the 2nd delay circuit 28 is provided between the timing generator 26 and the 2nd address line drivers 22b and 23b. The signals are supplied through the delay circuits 27 and 28 and the 2nd scanning line drivers 24b and 25b and 2nd address line drivers 22b and 23b are put in partial charge of the load.
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公开(公告)号：JPH04291392A
公开(公告)日：1992-10-15
申请号：JP5740491
申请日：1991-03-20
Applicant: FUJITSU LTD
Inventor： UEDA TOSHIO , YOSHIKAWA KAZUO , KAMEYAMA SHIGEKI
Abstract: PURPOSE:To make fluctuations, generated at border lines of gradations inconspicuous without increasing an address frequency (the number of subfields) while corresponding to a large-capacity panel by a batch write address method. CONSTITUTION:While batch display control over plural odd-numbered lines and even-numbered lines is performed, the display order of the subfields is made different between the odd-numbered lines and even-ordered lines and an odd-numbered line side driver 32 and an even-numbered line side driver 33 are independently controlled in the same frame. The fluctuations can, therefore, be prevented without increasing the number of address lines the number of subfields) in one frame.
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公开(公告)号：JP2000039867A
公开(公告)日：2000-02-08
申请号：JP12022699
申请日：1999-04-27
Applicant: FUJITSU LTD
Inventor： KUWABARA TAKESHI , KANAZAWA GIICHI , UEDA TOSHIO
Abstract: PROBLEM TO BE SOLVED: To make burning of a screen inconspicuous in displaying ordinary picture by discriminating the conditions of a picture to be displayed, choosing either the first or the second display means for the display depending on the result of the discrimination, and thereby dividing between a fixed picture that causes burning and other ordinary picture by means of an odd number/even number line display. SOLUTION: A discriminating means 310 discriminates the conditions of a picture to be displayed and causes a selector means 320 to select, depending on the result of the discrimination, the emission by odd number lines only (with even number lines turned off) or by even number lines only (with odd number lines turned off). To be concrete, if the picture to be displayed is a fixed picture (e.g. initial operation picture before the start of a prescribed operation), it is displayed as a picture on the odd number lines for example. If it is a picture other than the fixed picture (plural pictures specified by the initial operation picture), it is displayed as a picture on the even number lines.
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公开(公告)号：JPH10241572A
公开(公告)日：1998-09-11
申请号：JP4058597
申请日：1997-02-25
Applicant: FUJITSU LTD
Inventor： KANAZAWA GIICHI , UEDA TOSHIO
IPC: G09G3/20 , G09G3/288 , G09G3/296 , G09G3/298 , H01J11/12 , H01J11/22 , H01J11/24 , H01J11/26 , H01J11/28 , H01J11/34 , H01J11/36 , H01J11/38 , H01J11/42 , H01J11/44 , H04N5/66 , H01J11/02 , G09G3/28
Abstract: PROBLEM TO BE SOLVED: To reduce the effects of flickering of first and last display lines following interface display so as to improve display quality by cutting off only a part of a light emitted to a display surface among the lights of the first and last display lines. SOLUTION: Black light shielding means 40 and 41 are provided only in X1 and Xn+1 electrodes in upper and lower ends of a transparent insulating layer 35 provided in the glass board of a display surface side. Discharging is performed only in an odd-number field on the X1 electrode and, on the Xn+1 electrode, discharging is performed only in an even-number field. Thus, respective discharge components are turned ON and OFF repeatedly to cause flickering. By cutting of the discharge components of the first and last display lines by the light shielding means 40 and 41, the occurrence of flickering is prevented and the feeling of the up-and-down movement of an entire screen is eliminated. The light shielding means 40 and 41 are installed in positions as close as possible to discharge spaces so as to cut off the discharge components irrespective of the angle of visibility.
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