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91. 发明专利

JPH11259041A DRIVING METHOD OF PLASMA DISPLAY PANEL 失效
公开(公告)号：JPH11259041A
公开(公告)日：1999-09-24
申请号：JP5830698
申请日：1998-03-10
申请人： HITACHI LTD
发明人： MASUDA TAKEO , ISHIGAKI MASAHARU , SASAKI TAKASHI , MIZUTA TAKAHISA
IPC分类号： G09G3/20 , G09G3/288 , G09G3/291 , G09G3/292 , G09G3/294 , G09G3/296 , G09G3/298 , H01J11/12 , H01J11/14 , H01J11/24 , H01J11/26 , H01J11/36 , H01J11/42 , G09G3/28 , H01J11/00
摘要： PROBLEM TO BE SOLVED: To let all cells satisfactorily execute reset discharge and address discharge by decreasing discharge current in all reset discharging. SOLUTION: According to order of an arrangement on a panel 1, X-electrodes Xo of odd number data are driven at the same time by a driving circuit 2, and X-electrodes Xe of even number data are also driven at the same time by a driving circuit 3. For a reset discharging period in each sub-field, the driving circuit 2 firstly impresses a reset pulse on the X-electrodes Xo of odd number data and forms wall charges on all the cells of odd number data line Lo, and then, sequentially drives Y-electrodes Yo of odd number data and address-discharges the cells to be maintenance-discharged. When the above- mentioned discharge ends about the line Lo of odd number data, the reset- and address-discharges are performed in the same way to the line Le of even number data consisting of X electrodes Xe of even number data and Y- electrodes Ye of even number data by the driving circuit 3. The maintenance discharge is performed to all the lines of the panel 1 simultaneously.

92. 发明专利

JPH11212515A PLASMA DISPLAY DEVICE 失效
公开(公告)号：JPH11212515A
公开(公告)日：1999-08-06
申请号：JP928398
申请日：1998-01-21
申请人： HITACHI LTD
发明人： KAWANAMI YOSHIMI , SUZUKI KEIZO , YAMAMOTO KENICHI , KA KIRIN , ISHIGAKI MASAHARU , SATO RYOHEI , SHIBATA MASAYUKI , MURASE TOMOHIKO , KAWAI MICHIFUMI
IPC分类号： G09G3/296 , G09G3/20 , G09G3/288 , G09G3/291 , G09G3/294 , G09G3/298 , H01J11/12 , H01J11/22 , H01J11/24 , H01J11/26 , H01J11/32 , H01J11/34 , H01J11/36 , H01J11/38 , H01J11/42 , H01J17/04 , G09G3/28 , H01J11/02
摘要： PROBLEM TO BE SOLVED: To improve the light emission efficiency of a plasma display panel(PDP) and to reduce the power consumption by making the integral value of a discharging current in a specific period less than the integral value of a discharging current in the period after that. SOLUTION: When a period wherein a discharging current value which is >=5% of the maximum value of a discharging current of one discharging process is obtained is regarded as one discharging period, the integral value of the discharging current in a period from the beginning to 40% of the one discharging period is made smaller than the integral value of the discharging current in the period after that. Namely, while the distribution of the discharging current is made to correspond to the distribution of light emission efficiency, the discharging current before the time when the conventional discharging current has a maximum value is made small as shown in the graph II to improve the light emission efficiency. In this case, the time when the discharging current has the maximum value needs to be put close to the time when the light emission efficiency has the maximum value, namely, the discharging current in the front half of a discharging period wherein the light emission efficiency is relatively small needs to be reduced so as to improve the light emission efficiency of the whole discharging (value obtained by dividing all light emission by all electric power).

93. 发明专利

JPH11120919A PLASMA DISPLAY PANEL 失效
公开(公告)号：JPH11120919A
公开(公告)日：1999-04-30
申请号：JP27685997
申请日：1997-10-09
申请人： HITACHI LTD
发明人： SHIBATA MASAYUKI , SUZUKI KEIZO , ISHIGAKI MASAHARU , IKEDA YUICHI , KAWANO KANJI
IPC分类号： H01J11/00 , H01J11/12 , H01J11/24 , H01J11/26 , H01J11/28 , H01J11/32 , H01J11/36 , H01J11/38 , H01J11/42
摘要： PROBLEM TO BE SOLVED: To prevent the abnormal discharge and crosstalk between adjacent discharge elements to improve the display quality, and to prevent the damage of a driver IC by providing a conductive layer between the surface of the dielectric layer of a first substrate and the surface of the phosphor layer of a second substrate or between the dielectric layer of the second substrate and the phosphor layer. SOLUTION: A first panel 10 has maintenance electrodes 1a, 1b, 2a and 2b between a front glass base 5 and a front dielectric 4, and conductive materials 9a-9f are applied to the discharge area-side surface of the front dielectric 4. A second panel 20 has selecting electrodes 3a, 3b and 3c between a back glass substrate 8 and a back dielectric 7, and conductive materials 9g-9l are applied to the discharge area-side surface of phosphors 6a, 6b, and 6c. The conductive materials 9a-9f and 9g-9l absorb charged particles such as floating electrons to prevent them from being drifted to adjacent discharge elements, and the charged particles necessary for maintenance discharge are stored on the surface of the front dielectric 4.

94. 发明专利

JPH10207419A METHOD OF DRIVING PLASMA DISPLAY PANEL 失效
公开(公告)号：JPH10207419A
公开(公告)日：1998-08-07
申请号：JP958597
申请日：1997-01-22
申请人： HITACHI LTD
发明人： MASUDA TAKEO , ISHIGAKI MASAHARU , SASAKI TAKASHI , OTAKA HIROSHI
IPC分类号： G09G3/291 , G09G3/20 , G09G3/288 , G09G3/292 , G09G3/294 , G09G3/298 , G09G3/28
摘要： PROBLEM TO BE SOLVED: To prevent malfunction caused by excessive space charges generated by sustained electric discharge. SOLUTION: Between a last sustained discharge pulse 17 impressed during a sustained discharge period 3 of a preceding subfield SFn and a total write discharge pulse 19 impressed during a total write and erasing discharge period of the following subfield SF(n+1), a stabilized pulse 20 of the same pulse width as a period in which an electrode (for example, Y-electrode 6) becoming a negative side at a time of a total write discharge becomes a higher potential to an electrode (for example X-electrode) becoming a positive side at a time of the total write discharge is impressed so that the period is set to 10μsec or more or 500μsec or less. Thus, wall charges are sufficiently stored which damp space charges in a selected cell during the period and can be superimposed in a positive direction of the impressed voltage at the total write discharge, and the total write discharge and erase discharge are thus secured for a sufficient operation.

95. 发明专利

JPH10207418A CHARGE ERASING METHOD OF PLASMA DISPLAY PANEL 失效
公开(公告)号：JPH10207418A
公开(公告)日：1998-08-07
申请号：JP958397
申请日：1997-01-22
申请人： HITACHI LTD
发明人： SASAKI TAKASHI , ISHIGAKI MASAHARU , OTAKA HIROSHI , MASUDA TAKEO
IPC分类号： G09G3/291 , G09G3/20 , G09G3/288 , G09G3/292 , G09G3/293 , G09G3/294 , G09G3/298 , G09G3/28
摘要： PROBLEM TO BE SOLVED: To prevent excessive charges in a cell caused by main discharge from influencing a next sub-field discharge, especially in a small cell plasma display panel. SOLUTION: A main discharge occurs in a selected cell and light is emitted by impressing a sustained pulse 43 on an electrode X and sustained pulses 48a, 48b,... on each electrode Y for a sustained discharge period of each subfield, and after this main discharge, a first small line erasing pulse 44 of about 0.5-2.0μsec pulse width is impressed on the electrode X, and then a second small line erasing pulse 46 of a pulse width equal to or shorter than that of the first small line erasing pulse 44 is impressed on an electrode of address A, and further, following this, third small line erasing pulses 49a, 49b,... of a pulse width equal to or shorter than that of the second small line erasing pulse 46 are impressed on each electrode Y. These first and second small line erasing pulses 44, 46 may be replaced with each other or only the second small line erasing pulse 46 can be used.

96. 发明专利

JPH09319329A DRIVING METHOD FOR PLASMA DISPLAY PANEL 失效
公开(公告)号：JPH09319329A
公开(公告)日：1997-12-12
申请号：JP13801696
申请日：1996-05-31
申请人： HITACHI LTD
发明人： SASAKI TAKASHI , ISHIGAKI MASAHARU , MASUDA TAKEO
IPC分类号： G09G3/288 , G09G3/291 , G09G3/292 , G09G3/293 , G09G3/294 , G09G3/298 , G09G3/28
摘要： PROBLEM TO BE SOLVED: To stabilize the discharge by impressing a driving pulse having the same polarity as that of a driving pulse for performing the discharge in the length of a specific value prior to the specific value of a driving pulse for performing the discharge to control a current made to flow by the discharge. SOLUTION: A preliminary discharge pulse 17 is a pulse which continues for a time t1 from the time of the rising of its voltage to the time when the dropping of the voltage begins and the time of the pulse is roughly 0.1∼1μsec. Moreover, a time t2 from the preliminary discharge pulse 17 to a sustenance discharge pulse 14 is a time till a time when positive and negative electrically charged particles formed in a discharging space are diminished and is roughly 0.1∼1μsec. Consequently, a time from a time when the preliminary discharge pulse 17 is stopped to a time when the sustenance discharge pulse 14 is impressed is roughly not larger than 1μsec. Thus, the discharge is made to be continued stably by impressing the pulse being roughly 0.1∼1μsec roughly before 1μsec prior to the sustenance discharge pulse, preferably, before a period being 0.3 to 0.7μsec.

97. 发明专利

JPH09319328A WRITING METHOD FOR PLASMA DISPLAY PANEL 失效
公开(公告)号：JPH09319328A
公开(公告)日：1997-12-12
申请号：JP13517196
申请日：1996-05-29
申请人： HITACHI LTD
发明人： SASAKI TAKASHI , ISHIGAKI MASAHARU , MASUDA TAKEO
IPC分类号： G09G3/288 , G09G3/291 , G09G3/293 , G09G3/298 , G09G3/28
摘要： PROBLEM TO BE SOLVED: To prevent a screen from being disturbed by erroneous discharges by impressing write pulses so as not to be continuous at adjacent electrodes with each other. SOLUTION: After write pulses are successively and continuously impressed only on odd numbered rows of Y electrodes, write pulses are successively and continuously impressed on even numbered rows of the Y electrodes. That is, when scanning operations are completed to the (2K-1)th row of independent row Y electrode, next, a scanning pulse 72 is impressed in the second row of the independent row Y electrodes. At this time, this pulse is delayed by several hundreds μsec from adjacent scanning pulse 71 of the first row and scanning pulse 73 of the third row of the independent Y electrodes and it is sufficiently separated timewisely. As a result, it is eliminated that scanning pulses generate discharges with each other and, then, erroneous discharges are prevented from being generated. Successively, this operation is repeated to the 2kth row and sure writing operations are performed similarly. Thus, writing operations are performed from the first row to the 2kth row in such a manner.

98. 发明专利

JPH09305142A DISPLAY DEVICE 失效
公开(公告)号：JPH09305142A
公开(公告)日：1997-11-28
申请号：JP11768796
申请日：1996-05-13
申请人： HITACHI LTD
发明人： OTAKA HIROSHI , ISHIGAKI MASAHARU , KIMURA YUICHIRO , NOGUCHI TAIJI , KUMAKURA TAKESHI
IPC分类号： G09G3/20 , G09G3/28 , G09G3/288 , G09G3/291 , G09G3/293 , G09G3/294
摘要： PROBLEM TO BE SOLVED: To shorten a scanning period and to realize multi-level and high- luminance display by giving a scanning pulse given to a scanning electrode in order to select a light emitting point to optional plural lines in the same timing. SOLUTION: This device is provided with a front plate and a back plate where a display part is arranged at a regular interval, gas sealed between the front and back plates, and plural electrodes arranged in a matrix state; and voltage in accordance with an image signal is impressed on the electrodes arranged in the matrix state, so that the gas discharge is generated at an optional position and image display is executed. In such a case, as to driving waveform 100, the scanning pulse 104 given to the scanning electrode of a 1st line and the scanning pulse 105 given to the scanning electrode of a 2nd line are given in the same timing, and whether or not light is emitting in a maintenance period is selected according to an address pulse 101. Then, the scanning pulses are given to every two lines such as a 3rd line and a 4th line in the same timing and the propriety of light emission is selected according to the presence or absence of the address.

99. 发明专利

JPH09138667A PLASMA DISPLAY PANEL DRIVE SYSTEM 失效
公开(公告)号：JPH09138667A
公开(公告)日：1997-05-27
申请号：JP29691695
申请日：1995-11-15
申请人： HITACHI LTD
发明人： SASAKI TAKASHI , ISHIGAKI MASAHARU , YATSUDA NORIO , SANO YUJI , OTAKA HIROSHI , USHIFUSA NOBUYUKI , MATSUZAKI EIJI , TSUCHIDA SEIICHI
IPC分类号： G09G3/28 , G09G3/20 , G09G3/288 , G09G3/291 , G09G3/292
摘要： PROBLEM TO BE SOLVED: To reduce light of overall write discharge and to improve contrast. SOLUTION: This panel is constituted so that an independent A electrode 25 performing the overall write discharge on a rear glass substrate 22 and a common electrode 23 are arranged parallel to each other, and a main discharge space 32 is separated from a preliminary discharge space 33 by an upper/ lower partition wall 28 with a hole 31, and in respective sub-field, after the overall write is performed in the preliminary discharge space 33 without a stimulable phosphor layer, charged particles on a front glass substrate 15 side are removed by a fine line erase pulse. The write is performed by the independent A electrode 25 and a independent Y electrode, and by making a common X electrode high potential during a write period, the charged particles are effectively used.

100. 发明专利

JPH09120776A PLASMA DISPLAY PANEL 失效
公开(公告)号：JPH09120776A
公开(公告)日：1997-05-06
申请号：JP27916195
申请日：1995-10-26
申请人： HITACHI LTD
发明人： YATSUDA NORIO , ISHIGAKI MASAHARU , SASAKI TAKASHI , SANO YUJI , OTAKA HIROSHI , USHIFUSA NOBUYUKI , MATSUZAKI EIJI
IPC分类号： H01J11/12 , H01J11/16 , H01J11/22 , H01J11/24 , H01J11/26 , H01J11/28 , H01J11/32 , H01J11/34 , H01J11/36 , H01J11/42 , H01J11/44 , H01J11/46 , H01J11/02
摘要： PROBLEM TO BE SOLVED: To enhance the efficiency of utilizing the output light from a phosphor layer of a plasma display panel and heighten the brightness to a great extent. SOLUTION: A front plate 16 has a front glass 1 on which a display electrode 5 is installed while a back plate 18a has a back glass 11 on which a trigger electrode 12 and/or address electrode 14 are installed, and a bulkhead 17a to partition the cell spatially is furnished between the front plate 16 and the back plate 18a, wherein a phosphor layer 10 is furnished at the bulkhead 17a on the surface confronting the front discharge space 19 of a bulkhead plate 8 through a mirror face 9a made of aluminum. When ultraviolet rays are generated by electric discharge in the front discharge space 19, the phosphor layer 10 generates visible rays, which are emitted to outside through the front plate 16, when also the visible rays generated from the phosphor layer 10 on the bulkhead plate 8 side will be reflected by the mirror face 9a and emitted to the outside from the front plate 16. Thereby the visible rays from the phosphor layer 10 can be utilized effectively, and the brightness be heightened to a great extent.

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