WO2013121705A1 - Procédé d'attaque de dispositif d'affichage d'image, dispositif d'affichage d'image et système d'affichage d'image - Google Patents
Procédé d'attaque de dispositif d'affichage d'image, dispositif d'affichage d'image et système d'affichage d'image Download PDFInfo
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- WO2013121705A1 WO2013121705A1 PCT/JP2013/000414 JP2013000414W WO2013121705A1 WO 2013121705 A1 WO2013121705 A1 WO 2013121705A1 JP 2013000414 W JP2013000414 W JP 2013000414W WO 2013121705 A1 WO2013121705 A1 WO 2013121705A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/037—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor using the raster scan of a cathode-ray tube [CRT] for detecting the position of the member, e.g. light pens cooperating with CRT monitors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
- G06F3/0386—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry for light pen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/292—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
- G09G3/2927—Details of initialising
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/066—Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2354/00—Aspects of interface with display user
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
Definitions
- the present invention relates to a driving method of an image display apparatus that displays an image in an image display area by combining binary control of light emission and non-light emission in a plurality of light emitting elements constituting a pixel, an image display apparatus, and an image using a light pen.
- the present invention relates to an image display system capable of handwritten input of characters and drawings on a display device.
- a plasma display panel (hereinafter abbreviated as “panel”) is a typical image display device that displays an image in an image display area by combining binary control of light emission and non-light emission in each of a plurality of light emitting elements constituting a pixel. There is).
- a large number of discharge cells which are light-emitting elements constituting pixels, are formed between a front substrate and a rear substrate that are arranged to face each other.
- the front substrate a plurality of pairs of display electrodes composed of a pair of scan electrodes and sustain electrodes are formed in parallel with each other on the front glass substrate.
- the back substrate has a plurality of parallel data electrodes formed on a glass substrate on the back side.
- Each discharge cell is coated with one of red (R), green (G), and blue (B) phosphors, and a discharge gas is enclosed therein.
- R red
- G green
- B blue
- an ultraviolet ray is generated by causing a gas discharge, and the phosphor is excited to emit light by the ultraviolet ray.
- a subfield method is generally used as a method of displaying an image in an image display area of a panel by combining binary control of light emission and non-light emission in a light emitting element.
- each discharge cell In the subfield method, one field is divided into a plurality of subfields having different emission luminances.
- each discharge cell light emission / non-light emission of each subfield is controlled by a combination according to the gradation value to be displayed.
- each discharge cell emits light with brightness corresponding to the gradation value to be displayed, and a color image composed of various combinations of gradation values is displayed in the image display area of the panel.
- Some of such image display apparatuses have a function of allowing handwriting input of characters and drawings on a panel using a pointing device called “light pen”.
- position coordinates In order to realize a handwriting input function using a light pen, a technique for detecting the position of the light pen in an image display area is disclosed.
- position coordinates the coordinates representing the position of the light pen in the image display area.
- an abscissa detection subfield for displaying an abscissa detection pattern is provided in one field. Then, the light emission of this abscissa detection subfield is detected by the light pen, and the position (abscissa) of the light pen is detected based on the timing at which the light emission is detected.
- a position detection period for generating a light signal for detecting position coordinates is provided in one field only when detecting the position coordinates of the light pen. Then, this light signal is detected by the light pen, and the position coordinates of the light pen are detected based on the timing at which the light signal is detected.
- An image display device includes an image display unit having a plurality of scan electrodes, sustain electrodes, and a plurality of data electrodes, and a drive circuit configured to form one field by a plurality of subfields and drive the image display unit.
- the drive circuit includes a plurality of image display subfields, a y-coordinate detection subfield, and an x-coordinate detection subfield in one field, and displays an image on the image display unit.
- the drive circuit provides an initialization period for each of the plurality of image display subfields and the x-coordinate detection subfield.
- a falling ramp waveform voltage is applied to the scan electrodes, A voltage is applied to the sustain electrode and the data electrode so that the voltage between the scan electrode does not exceed the discharge start voltage and the voltage between the data electrode and the scan electrode exceeds the discharge start voltage.
- the arrival potential of the downward ramp voltage applied to the scan electrode in the initialization period of the x-coordinate detection subfield is lower than the arrival potential of the downward ramp voltage applied to the scan electrode in the initialization period of the image display subfield.
- An image display system includes the above-described image display device, a light pen, a coordinate calculation circuit, and a drawing circuit.
- the light pen has a light receiving element.
- the light receiving element receives light emission and converts it into an electrical signal.
- the light pen receives light emission generated in the image display unit in the y coordinate detection subfield and light emission generated in the image display unit in the x coordinate detection subfield, and outputs a light reception signal.
- the coordinate calculation circuit based on the light reception signal, coordinates indicating the position of light emission received by the light pen in the light emission generated in the image display unit in the y coordinate detection subfield, and light emission generated in the image display unit in the x coordinate detection subfield.
- the coordinates representing the light emission position received by the light pen are calculated.
- the drawing circuit creates a drawing signal for displaying an image based on the coordinates calculated by the coordinate calculation circuit on the image display unit. Then, the image display device displays an image based on the drawing signal on the image display unit.
- FIG. 1 is an exploded perspective view showing an example of the structure of a panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
- FIG. 2 is a diagram showing an example of the electrode arrangement of the panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
- FIG. 3 schematically shows an example of a drive voltage waveform applied to each electrode of the panel in subfields SF1 to SF3 of the image display subfield in the first embodiment of the present invention.
- FIG. 4 schematically shows an example of a drive voltage waveform applied to each electrode of the panel in y coordinate detection subfield SFy and x coordinate detection subfield SFx in the first embodiment of the present invention.
- FIG. 5 schematically shows an example of a drive voltage waveform applied to each electrode of the panel in the image display subfield according to the second embodiment of the present invention.
- FIG. 6 schematically shows an example of a drive voltage waveform applied to each electrode of the panel in timing detection subfield SFo, y coordinate detection subfield SFy, and x coordinate detection subfield SFx in the second embodiment of the present invention. It is.
- FIG. 7 is a diagram schematically showing an example of a circuit block and a plasma display system constituting the plasma display device in accordance with the second exemplary embodiment of the present invention.
- FIG. 8 is a circuit diagram schematically showing a configuration example of a scan electrode driving circuit of the plasma display device in accordance with the second exemplary embodiment of the present invention.
- FIG. 9 is a circuit diagram schematically showing a configuration example of the sustain electrode driving circuit of the plasma display device in accordance with the second exemplary embodiment of the present invention.
- FIG. 10 is a circuit diagram schematically showing a configuration example of the data electrode driving circuit of the plasma display device in accordance with the second exemplary embodiment of the present invention.
- FIG. 11 is a diagram schematically showing an example of an operation when detecting the position coordinates of the light pen in the plasma display system in accordance with the second exemplary embodiment of the present invention.
- FIG. 12 is a diagram schematically showing an example of a drive voltage waveform when detecting the position coordinates of the light pen in the plasma display system according to the second embodiment of the present invention.
- FIG. 10 is a circuit diagram schematically showing a configuration example of the data electrode driving circuit of the plasma display device in accordance with the second exemplary embodiment of the present invention.
- FIG. 11 is a diagram schematically showing an example of an operation when detecting the position coordinates of the light pen in the plasma display system in accordance
- FIG. 13 is a diagram schematically illustrating an example of an operation when performing handwritten input with a light pen in the plasma display system according to the second exemplary embodiment of the present invention.
- FIG. 14 schematically shows another example of the drive voltage waveform applied to each electrode of the panel in the timing detection subfield SFo, the y coordinate detection subfield SFy, and the x coordinate detection subfield SFx in the second embodiment of the present invention.
- FIG. 14 schematically shows another example of the drive voltage waveform applied to each electrode of the panel in the timing detection subfield SFo, the y coordinate detection subfield SFy, and the x coordinate detection subfield SFx in the second embodiment of the present invention.
- FIG. 1 is an exploded perspective view showing an example of the structure of a panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
- a plurality of display electrode pairs 14 each including a scanning electrode 12 and a sustaining electrode 13 are formed on a glass front substrate 11.
- a dielectric layer 15 is formed so as to cover the display electrode pair 14, and a protective layer 16 is formed on the dielectric layer 15.
- the front substrate 11 serves as an image display surface on which an image is displayed.
- a plurality of data electrodes 22 are formed on the rear substrate 21, a dielectric layer 23 is formed so as to cover the data electrodes 22, and a grid-like partition wall 24 is further formed thereon.
- the phosphor layer 25R that emits red (R), the phosphor layer 25G that emits green (G), and the phosphor layer that emits blue (B) are formed on the side surfaces of the barrier ribs 24 and the surface of the dielectric layer 23. 25B is provided.
- the phosphor layer 25R, the phosphor layer 25G, and the phosphor layer 25B are collectively referred to as a phosphor layer 25.
- the front substrate 11 and the rear substrate 21 are arranged to face each other so that the display electrode pair 14 and the data electrode 22 intersect each other with a minute space therebetween, and a discharge space is provided in the gap between the front substrate 11 and the rear substrate 21.
- the outer peripheral part is sealed with sealing materials, such as glass frit.
- sealing materials such as glass frit.
- a mixed gas of neon and xenon is sealed in the discharge space as a discharge gas.
- the discharge space is partitioned into a plurality of sections by the barrier ribs 24, and discharge cells, which are light-emitting elements constituting the pixels, are formed at the intersections between the display electrode pairs 14 and the data electrodes 22.
- discharge is generated in these discharge cells, and the phosphor layer 25 emits light (discharge cells are turned on), thereby displaying a color image on the panel 10.
- one pixel is composed of three consecutive discharge cells arranged in the direction in which the display electrode pair 14 extends.
- the three discharge cells are a discharge cell having a phosphor layer 25R and emitting red (R) light (hereinafter referred to as “red discharge cell” or “red pixel”), and a phosphor layer 25G.
- Discharge cells hereinafter referred to as “green discharge cells” or “green pixels”) having a green color (G)
- green pixels having a phosphor layer 25B.
- the structure of the panel 10 is not limited to the above-described structure, and may be, for example, provided with a stripe-shaped partition wall.
- FIG. 2 is a diagram showing an example of the electrode arrangement of the panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
- n scan electrodes SC1 to SCn scan electrode 12 in FIG. 1
- n sustain electrodes SU1 to SUn sustain electrode 13 in FIG. 1 extended in the first direction
- the m data electrodes D1 to Dm data electrode 22 in FIG. 1 extended in the second direction intersecting the first direction are arranged.
- the first direction is referred to as a row direction (or horizontal direction or line direction), and the second direction is referred to as a column direction (or vertical direction).
- m discharge cells are formed on one pair of display electrodes 14 and m / 3 pixels are formed.
- the discharge cell having the data electrode Dp + 1 is coated with a green phosphor as the phosphor layer 25G, and this discharge cell becomes a green discharge cell.
- a blue phosphor is applied as a phosphor layer 25B to the discharge cell having the data electrode Dp + 2, and this discharge cell becomes a blue discharge cell.
- a red discharge cell, a green discharge cell, and a blue discharge cell adjacent to each other constitute a set to constitute one pixel.
- one field includes a plurality of image display subfields for displaying an image on the panel 10, a y coordinate detection subfield SFy, and an x coordinate detection subfield SFx.
- the image display subfield is also simply referred to as a subfield.
- Each image display subfield has an initialization period, an address period, and a sustain period.
- initialization discharge is generated in each discharge cell, and wall charges necessary for the subsequent address operation are formed in the discharge cell.
- priming particles charged particles that assist the generation of discharge
- address period an address discharge is generated in the discharge cells that should emit light.
- sustain pulses are alternately applied to the scan electrodes and the sustain electrodes, and a sustain discharge is generated in the discharge cells that have generated the address discharge.
- the initialization operation in the initialization period includes “forced initialization operation” and “selective initialization operation”, and generated drive voltage waveforms are different from each other.
- forced initializing operation an initializing discharge is forcibly generated in the discharge cells regardless of the presence or absence of discharge in the immediately preceding subfield.
- selective initializing operation initializing discharge is selectively generated only in the discharge cells that have generated address discharge in the address period of the immediately preceding subfield.
- the first subfield (for example, subfield SF1) is set as a subfield (forced initialization subfield) for performing a forced initialization operation, and other subfields are included.
- a field for example, a subfield after subfield SF2
- selective initialization subfield for performing a selective initialization operation.
- a luminance weight is set for each subfield.
- one field has eight subfields (subfields SF1 to SF8), and each subfield has a luminance of (1, 34, 21, 13, 8, 5, 3, 2).
- An example of setting a weight is given.
- the position of the light pen in the image display area is represented by the x coordinate and the y coordinate.
- the y coordinate detection subfield SFy is a subfield for detecting the y coordinate of the position of the light pen in the image display area, and has an initialization period Piby and a y coordinate detection period Py.
- the x-coordinate detection subfield SFx is a subfield for detecting the x-coordinate of the position of the light pen in the image display area, and has an initialization period Picx and an x-coordinate detection period Px.
- the light pen is provided in the plasma display system, and is used by a user to input characters and drawings on the panel by handwriting. Details of the light pen will be described later.
- the y coordinate detection subfield SFy and the x coordinate detection subfield SFx are not necessarily provided every time. It does not have to be provided in the field.
- the y-coordinate detection subfield SFy and the x-coordinate detection subfield SFx may be generated at a rate of once per a plurality of fields according to the video signal, the usage state of the plasma display device, and the like.
- FIG. 3 is a diagram schematically showing an example of a drive voltage waveform applied to each electrode of panel 10 in subfields SF1 to SF3 of the image display subfield according to Embodiment 1 of the present invention.
- FIG. 3 shows sustain electrodes SU1 to SUn, scan electrode SC1 that performs the address operation first in the address period, scan electrode SCn that performs the address operation last in the address period (for example, scan electrode SC1080), and data electrode D1 to data electrode.
- the drive voltage waveform applied to each of Dm (for example, data electrode D5760) is shown.
- Scan electrode SCi, sustain electrode SUi, and data electrode Dk in the following represent electrodes selected based on image data (data indicating light emission / non-light emission for each subfield) from among the electrodes.
- the waveform shape of the drive voltage applied to the scan electrode 22 during the initialization period differs between the subfield SF1 that is the forced initialization subfield and the subfield SF2 and subsequent subfields that are the selective initialization subfield.
- each subfield after subfield SF3 generates a drive voltage waveform substantially similar to that of subfield SF2, except for the number of sustain pulses.
- the voltage 0 (V) is applied to the data electrodes D1 to Dm and the sustain electrodes SU1 to SUn.
- a scan waveform SC1 to SCn is applied with voltage Vi1 after voltage 0 (V) is applied, and a ramp waveform voltage (hereinafter referred to as “upward ramp waveform voltage”) that gradually rises from voltage Vi1 to voltage Vi2.
- the voltage Vi1 is set to a voltage lower than the discharge start voltage for the sustain electrodes SU1 to SUn, and the voltage Vi2 is set to a voltage exceeding the discharge start voltage for the sustain electrodes SU1 to SUn.
- negative wall voltage is accumulated on scan electrodes SC1 to SCn
- positive wall voltage is accumulated on data electrodes D1 to Dm and sustain electrodes SU1 to SUn.
- priming particles that assist the generation of the address discharge are generated in the discharge cell.
- the wall voltage on the electrode represents a voltage generated by wall charges accumulated on the dielectric layer covering the electrode, the protective layer, the phosphor layer, and the like.
- the voltage of scan electrodes SC1 to SCn is once lowered to voltage Vi3 lower than voltage Vi2, and then lowered to voltage 0 (V).
- the voltage Vi3 is set to a voltage lower than the voltage Vi2 and lower than the discharge start voltage with respect to the sustain electrodes SU1 to SUn.
- the voltage Vi3 may be a voltage that does not cause discharge in the discharge cell.
- FIG. 3 shows an example in which the voltage applied to scan electrodes SC1 to SCn is once lowered from voltage Vi2 to voltage Vi3 and then lowered to voltage 0 (V).
- the present invention is not limited to this configuration. Is not to be done.
- the voltage may be sharply decreased from the voltage Vi2 to the voltage 0 (V).
- the voltage 0 (V) is applied to the data electrodes D1 to Dm, and the positive voltage Ve is applied to the sustain electrodes SU1 to SUn. .
- the scan electrodes SC1 to SCn have a ramp waveform voltage (hereinafter simply referred to as “down ramp waveform voltage”) that gently falls from a voltage that is less than the discharge start voltage (eg, voltage 0 (V)) to the negative voltage Vi4. ) Is applied.
- Voltage Vi4 is set to a voltage exceeding the discharge start voltage with respect to sustain electrodes SU1 to SUn.
- the voltage applied to the scan electrodes SC1 to SCn is set to the voltage Vc.
- the forced initialization operation in the initialization period Pia1 of the forced initialization subfield is completed.
- the drive voltage waveform generated in the initialization period Pia1 is a forced initialization waveform (first forced initialization waveform).
- the forced initializing operation is described as an initializing operation for forcibly generating an initializing discharge in all the discharge cells in the image display area of the panel. It is not limited to.
- an operation for applying a forced initialization waveform only to a part of the discharge cells in the image display area of the panel is also a forced initialization operation, and a subfield for performing the forced initialization operation is forcibly initialized.
- Subfield For example, in the odd-field subfield SF1, the forced initializing waveform is applied only to the odd-numbered scan electrodes SC (2N-1) (N is an integer of 1 or more), and the other scan electrodes SC (2N) are described later. A selective initialization waveform is applied.
- a forced initialization waveform is applied only to the even-numbered scan electrode SC (2N), and a selective initialization waveform is applied to the other scan electrode SC (2N-1).
- the scan electrodes SC1 to SCn to which the forced initialization waveform is applied may be changed for each field. The same applies to all subfields that perform the forced initialization operation in the following description.
- the voltage 0 (V) is applied to the data electrodes D1 to Dm
- the voltage Ve is applied to the sustain electrodes SU1 to SUn
- the voltage Vc is applied to the scan electrodes SC1 to SCn.
- a negative scan pulse having a negative voltage Va is applied to the scan electrode SC1 in the first row.
- a positive address pulse of a positive voltage Vd is applied to the data electrode Dk of the discharge cell that should emit light in the first row of the data electrodes D1 to Dm.
- the time from the end of the initialization period Pia1 to the generation of the first address pulse in the address period Pw1 (the first scan pulse is applied after the voltage Vc is applied to the scan electrode SC1).
- Tw0, and the time for applying the scan pulse to each of the scan electrodes SC1 to SCn (the width of the scan pulse, and the width of the write pulse applied to the data electrode Dk is substantially equal to this) Tw1
- the period Tw0 is about 50 ⁇ sec, for example, and Tw1 is about 1 ⁇ sec, for example.
- a scan pulse of voltage Va is applied to scan electrode SC2 in the second row, and an address pulse of voltage Vd is applied to data electrode Dk corresponding to the discharge cell to emit light in the second row.
- address discharge occurs in the discharge cells in the second row to which the scan pulse and address pulse are simultaneously applied. Address discharge does not occur in the discharge cells to which no address pulse is applied. Thus, the address operation in the discharge cells in the second row is performed.
- the order in which the scan pulses are applied to the scan electrodes SC1 to SCn is not limited to the order described above.
- the order in which the scan pulses are applied to the scan electrodes SC1 to SCn may be arbitrarily set according to the specifications of the image display device.
- voltage 0 (V) is applied to the data electrodes D1 to Dm. Then, a sustain pulse of positive voltage Vs is applied to scan electrodes SC1 to SCn, and voltage 0 (V) is applied to sustain electrodes SU1 to SUn.
- a sustain discharge is generated between the scan electrode SCi and the sustain electrode SUi in the discharge cell that has generated the address discharge in the immediately preceding address period Pw1.
- the phosphor layer 25 of the discharge cell emits light due to the ultraviolet rays generated by the sustain discharge.
- a negative wall voltage is accumulated on scan electrode SCi, and a positive wall voltage is accumulated on sustain electrode SUi. Further, a positive wall voltage is also accumulated on the data electrode Dk.
- the sustain discharge does not occur in the discharge cells in which the address discharge has not occurred in the immediately preceding address period Pw1, and the wall voltage at the end of the initialization period Pia1 is maintained.
- the number of sustain pulses obtained by multiplying the brightness weight by a predetermined brightness multiple is alternately applied to scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn.
- the discharge cells that have generated the address discharge in the immediately preceding address period Pw1 generate the sustain discharge the number of times corresponding to the luminance weight, and emit light with the luminance corresponding to the luminance weight.
- the negative wall voltage is accumulated on the sustain electrode SUi and the positive wall voltage is accumulated on the scan electrode SCi, so that the discharge start voltage of those discharge cells is exceeded.
- the voltage Vr is set as the voltage.
- the selective initialization subfield will be described by taking the subfield SF2 as an example.
- a driving voltage waveform similar to that in the initialization period Pib2 of the subfield SF2 is generated and applied to each electrode for selective initialization. Perform the action.
- the second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm, and the third voltage (voltage 0 (voltage 0 (V)) is applied to the sustain electrodes SU1 to SUn. V)) is applied.
- a downward ramp waveform voltage that drops from a voltage that is lower than the discharge start voltage (for example, voltage 0 (V)) to a first voltage (negative voltage Vi4) is applied to scan electrodes SC1 to SCn.
- This downward ramp waveform voltage has a waveform shape that drops to the same voltage Vi4 at the same gradient as the downward ramp waveform voltage generated in the second period Pi2 of the initialization period Pia1.
- the voltage between the sustain electrodes SU1 to SUn and the scan electrodes SC1 to SCn is the discharge start voltage while the downward ramp waveform voltage is applied to the scan electrodes SC1 to SCn.
- the second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm and maintained so that the voltage between the data electrodes D1 to Dm and the scan electrodes SC1 to SCn exceeds the discharge start voltage.
- a third voltage (voltage 0 (V)) is applied to the electrodes SU1 to SUn.
- the positive wall voltage accumulated on the data electrode Dk by the last sustain discharge is adjusted to a wall voltage suitable for the address operation by discharging an excessive portion by this initializing discharge.
- the initialization discharge does not occur, and the wall voltage at the end of the initialization period Pia1 of the subfield SF1 is maintained.
- the voltage applied to the scan electrodes SC1 to SCn is once set to the voltage 0 (V).
- the third period Pi3 of the initialization period Pib2 ends.
- the second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm
- the third voltage (voltage 0 (voltage 0 (V)) is applied to the sustain electrodes SU1 to SUn. V))
- a higher positive voltage Ve is applied.
- a downward ramp waveform voltage that drops from a voltage that is lower than the discharge start voltage (for example, voltage 0 (V)) to a first voltage (negative voltage Vi4) is applied to scan electrodes SC1 to SCn.
- This downward ramp waveform voltage has the same waveform shape as the downward ramp waveform voltage generated in the third period Pi3.
- This initialization discharge weakens the wall voltage on scan electrode SCi and the wall voltage on sustain electrode SUi.
- the initialization discharge does not occur as in the third period Pi3, and the wall at the end of the initialization period Pia1 of the subfield SF1. The voltage is maintained.
- the discharge cells that have performed the address operation in the address period Pw1 of the immediately preceding subfield SF1 are selectively used.
- a selective initialization operation for generating an initialization discharge is performed. That is, in the discharge cell in which the sustain discharge is generated in the sustain period Ps1 of the immediately preceding subfield SF1, a weak initializing discharge is generated between the scan electrode SCi and the data electrode Dk in the third period Pi3, and the fourth period Pi4. Then, a weak initializing discharge is generated between scan electrode SCi and sustain electrode SUi.
- the wall voltage in the discharge cell is adjusted to a wall voltage suitable for the address operation in the subsequent address period Pw2.
- priming particles that assist the generation of the address discharge are generated in the discharge cell.
- the above-described drive voltage waveform generated in the initialization period Pib2 is a selection initialization waveform (first selection initialization waveform).
- the voltage Vi4 and the voltage Ve are set to voltage values that satisfy the above-described operation according to the characteristics of the panel 10, the specifications of the plasma display device 100, and the like.
- the initialization period Pib2 in which the selective initialization operation is performed is divided into a third period Pi3 and a fourth period Pi4, and a downward ramp waveform voltage is applied to the scan electrodes SC1 to SCn in each period. The reason why the initializing discharge is generated twice in each period will be described.
- the discharge start voltage tends to decrease under the influence of priming particles generated by the discharge. Therefore, in the discharge cell in which the discharge is continuously generated by the ramp waveform voltage, the priming particles gradually increase due to the continuous discharge, and thus the discharge start voltage gradually decreases.
- the discharge between the scan electrode SCi and the data electrode Dk (first discharge) and the discharge between the scan electrode SCi and the sustain electrode SUi (second discharge) occur simultaneously during the selective initialization operation, each discharge More priming particles are generated as compared to when they are generated individually.
- the discharge start voltage is likely to be reduced, and the discharge cell It is difficult to accurately control the wall voltage to be formed. That is, in the selective initializing operation in which the first discharge and the second discharge are generated simultaneously, the wall voltage tends to vary between the discharge cells, and the variation in the wall voltage makes the subsequent address discharge unstable. There is a risk.
- the initialization discharge is first generated between the scan electrode SCi and the data electrode Dk in the third period Pi3, and then continues.
- an initializing discharge is generated between the scan electrode SCi and the sustain electrode SUi.
- the wall voltage variation is reduced, and the subsequent address discharge is more It can be generated stably.
- the first discharge and the second discharge are simultaneously generated in the second period Pi2.
- the initializing discharge due to the rising ramp waveform voltage is forcibly generated in all the discharge cells in the image display area of the panel 10, and the wall voltage of each discharge cell is changed.
- the wall voltage of each discharge cell is already almost uniform immediately before the start of the second period Pi2, and even if the first discharge and the second discharge are generated simultaneously in the second period Pi2, A wall voltage can be systematically formed in the discharge cell.
- the initialization operation is performed by setting the number of times of generation of the downward ramp waveform voltage twice in the initialization period Pib2, and the number of generations of the downward ramp waveform voltage is set to 1 in the second period Pi2 of the initialization period Pia1.
- the initialization operation is performed at a time.
- the drive voltage waveform generated in the second period Pi2 of the initialization period Pia1 in which the forced initialization operation is performed is not limited to the waveform shape shown in FIG.
- the same drive voltage waveform (a waveform that generates two downward ramp waveform voltages in succession) may be generated.
- a drive voltage waveform for generating an address discharge in the discharge cells to emit light is applied to each electrode.
- the number of sustain pulses corresponding to the luminance weight is alternately applied to the scan electrodes SC1 to SCn and the sustain electrodes SU1 to SUn, and after the sustain pulse is generated, An upward ramp waveform voltage is applied to scan electrodes SC1 to SCn.
- each subfield after the subfield SF3 in the initialization periods Pib3 to Pib8 and the write periods Pw3 to Pw8, the drive voltage waveforms similar to those in the initialization period Pib2 and the write period Pw2 of the subfield SF2 are applied to the electrodes.
- sustain periods Ps3 to Ps8 as in sustain period Ps2 of subfield SF2, the number of sustain pulses corresponding to the luminance weight is alternately applied to scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn.
- the subfield for performing the forced initialization operation is the subfield SF1, but the present invention is not limited to this configuration.
- the subfield in which the forced initialization operation is performed may be a subfield after subfield SF2.
- the present invention is not limited to this configuration.
- the number of times of performing the forced initialization operation may be once in a plurality of fields.
- FIG. 4 schematically shows an example of a drive voltage waveform applied to each electrode of panel 10 in y-coordinate detection subfield SFy and x-coordinate detection subfield SFx in Embodiment 1 of the present invention.
- FIG. 4 shows driving voltage waveforms applied to sustain electrodes SU1 to SUn, scan electrodes SC1 to SCn, and data electrodes D1 to Dm in y coordinate detection subfield SFy and x coordinate detection subfield SFx.
- FIG. 4 also shows a part of the sustain period Ps8 of the subfield SF8 immediately before the y coordinate detection subfield SFy and a part of the subfield SF1.
- the initialization period Piby of the y-coordinate detection subfield SFy the same selective initialization operation as the initialization period Pib2 of the subfield SF2 is performed. That is, the initialization period Piby is composed of the third period Pi3 and the fourth period Pi4, similarly to the initialization period Pib2 of the subfield SF2.
- an initializing discharge is generated between the scan electrode SCi and the data electrode Dk in the third period Pi3, and then an initializing discharge is generated between the scan electrode SCi and the sustain electrode SUi in the fourth period Pi4.
- a drive voltage waveform (first selective initialization waveform) substantially similar to that in the initialization period Pib2 of the subfield SF2 is generated and applied to each electrode.
- a drive voltage waveform similar to that in the third period Pi3 of the initialization period Pib2 is generated and applied to each electrode.
- a second voltage (voltage 0 (V)) is applied to data electrodes D1 to Dm
- a third voltage (voltage 0 (V)) is applied to sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that drops from a voltage that is less than the discharge start voltage (for example, voltage 0 (V)) to a first voltage (negative voltage Vi4) is applied to scan electrodes SC1 to SCn.
- an initializing discharge is generated between the scan electrode SCi and the data electrode Dk.
- a drive voltage waveform similar to that in the fourth period Pi4 of the initialization period Pib2 is generated and applied to each electrode.
- a second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm, and a positive voltage Ve higher than the third voltage 0 (V) is applied to the sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that falls from a voltage (for example, voltage 0 (V)) that is less than the discharge start voltage to a negative voltage Vi4 is applied to scan electrodes SC1 to SCn.
- the wall voltage of the discharge cell is adjusted to a wall voltage suitable for the y coordinate detection pattern display operation in the subsequent y coordinate detection period Py. Furthermore, priming particles that assist the generation of discharge in the y-coordinate detection period Py are generated in the discharge cell.
- the voltage Ve is applied to the sustain electrodes SU1 to SUn
- the voltage 0 (V) is applied to the data electrodes D1 to Dm
- the scan electrodes SC1 to SCn are applied to SCn. Then, this state is maintained during the period Ty0.
- this period Ty0 is a period Tw0 until a scan pulse is applied to the scan electrodes SC1 to SCn in the address periods Pw1 to Pw8 of the subfields SF1 to SF8 which are image display subfields shown in FIG. For example, it is set to about 700 ⁇ sec.
- positive y-coordinate detection voltage Vdy is applied to data electrodes D1 to Dm, and negative y-coordinate detection pulse of voltage Vay is applied to scan electrode SC1 in the first row.
- the y coordinate detection voltage Vdy is a voltage higher than the voltage 0 (V), and the voltage Vay of the y coordinate detection pulse is a negative voltage lower than the voltage Vc.
- the pulse width of the y coordinate detection pulse is shown as Ty1.
- the data electrodes D1 to Dm and the scan electrodes The voltage difference at the intersection with SC1 exceeds the discharge start voltage, and discharge occurs between data electrodes D1 to Dm and scan electrode SC1, and between sustain electrode SU1 and scan electrode SC1.
- discharge occurs in all the discharge cells constituting the first row, and these discharge cells emit light all at once.
- the 5760 discharge cells (1920 pixels) constituting the first row emit light all at once. And this light emission becomes light emission for y coordinate detection.
- discharge cell row an aggregate of discharge cells constituting one row
- pixel row an aggregate of pixels constituting one row
- the discharge cell row and the pixel row are substantially the same, and in the above operation, the first pixel row (first discharge cell row) emits light all at once.
- a positive wall voltage is accumulated on scan electrode SC1
- a negative wall voltage is accumulated on sustain electrode SU1
- a negative wall voltage is also formed on data electrodes D1 to Dm. Is accumulated.
- a y coordinate detection pulse of the voltage Vay is applied to the scan electrode SC2 in the second row.
- discharge occurs between data electrodes D1 to Dm and scan electrode SC2, and between sustain electrode SU2 and scan electrode SC2, and y is generated in the second pixel row (second discharge cell row). Light emission for coordinate detection occurs.
- the voltage Vc higher than the voltage Vay of the y coordinate detection pulse is applied to the scan electrodes SC1 to SCn, and the y coordinate A voltage 0 (V) lower than the detection voltage Vdy is applied to the data electrodes D1 to Dm.
- the negative y coordinate detection pulse is sequentially applied to each of the scan electrodes SC1 to SCn while the positive y coordinate detection voltage Vdy is applied to the data electrodes D1 to Dm.
- light emission for detecting the y coordinate is sequentially generated in each pixel row (discharge cell row) from the first row to the n-th row.
- one horizontal line that emits light corresponds to the upper end portion (pixels in the first row) of the image display area of the panel 10.
- a pattern (y-coordinate detection pattern) that sequentially moves one line at a time from the lower line to the lower end (nth pixel line) is displayed. That is, the y-coordinate detection pattern is a pattern in which each pixel row from the first row to the n-th row of the image display area sequentially emits light for each row.
- the light pen receives the light emission of this pixel row.
- each pixel row from the first row to the n-th row in the image display region sequentially emits light for each row, so that the pen tip of the light pen is the image display region of the panel 10.
- the timing at which the light pen receives this light emission varies depending on where the light pen is.
- the y-coordinate of the position (x-coordinate, y-coordinate) of the light pen in the image display area is detected by detecting when the light emission is received by the light pen and the light reception timing.
- the period during which the y-coordinate detection pattern is displayed on the panel 10 is very short. Therefore, the possibility that the y-coordinate detection pattern is recognized by the user is low, and even if it is recognized by the user, it is only a slight change in luminance.
- the time for applying the y-coordinate detection pulse to each of the scan electrodes SC1 to SCn is Ty1.
- the initialization period Picx of the x-coordinate detection subfield SFx a forced initialization operation is performed.
- a drive voltage waveform different from that in the initialization period Pia1 of the subfield SF1 is applied to each electrode.
- the initialization period Picx is divided into three periods of a fifth period Pi5, a sixth period Pi6, and a seventh period Pi7, and each period will be described.
- the same drive voltage waveform as that in the first period Pi1 of the initialization period Pia1 is applied to each electrode.
- a voltage of 0 (V) is applied to each of the data electrodes D1 to Dm and the sustain electrodes SU1 to SUn.
- a voltage Vi1 is applied to scan electrodes SC1 to SCn after voltage 0 (V) is applied, and then an upward ramp waveform voltage that gradually rises from voltage Vi1 to voltage Vi2 is applied.
- Voltage Vi1 is set to a voltage lower than the discharge start voltage with respect to sustain electrodes SU1 to SUn.
- Voltage Vi2 is set to a voltage exceeding the discharge start voltage with respect to sustain electrodes SU1 to SUn.
- the rising ramp waveform voltage has a waveform shape that rises to the same voltage Vi2 with the same gradient as the rising ramp waveform voltage generated in the first period Pi1 of the initialization period Pia1.
- negative wall voltage is accumulated on scan electrodes SC1 to SCn
- positive wall voltage is accumulated on data electrodes D1 to Dm and sustain electrodes SU1 to SUn. Furthermore, priming particles that assist the generation of discharge in the subsequent x-coordinate detection period Px are generated in the discharge cell.
- the voltage applied to scan electrodes SC1 to SCn reaches voltage Vi2
- the voltage of scan electrodes SC1 to SCn is once lowered to voltage Vi3 lower than voltage Vi2, and then lowered to voltage 0 (V).
- the present invention is not limited to this configuration.
- the voltage may be sharply decreased from voltage Vi2 to voltage 0 (V).
- the downward ramp waveform voltage generated in the second period Pi2 of the initialization period Pia1 of the subfield SF1 and the third period Pi3 of the initialization periods Pib2 to Pib8 of the subfields SF2 to SF8 is similar and descends with the same gradient, but a descending ramp waveform voltage having a larger amplitude is applied to scan electrodes SC to SCn.
- the second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm
- the third voltage (voltage 0 (V)) is applied to the sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that falls from a voltage (for example, voltage 0 (V)) lower than the discharge start voltage to a fourth voltage (negative voltage Va) is applied to scan electrodes SC1 to SCn.
- the negative voltage Va has a lower voltage value than the negative voltage Vi4. That is, the absolute value of the voltage Va is larger than the absolute value of the voltage Vi4.
- the voltage Va is about ⁇ 200 (V), for example, and the voltage Vi4 is about ⁇ 175 (V), for example.
- the downward ramp waveform voltage generated in the sixth period Pi6 is the downward ramp waveform voltage generated in the second period Pi2 of the initialization period Pia1 of the subfield SF1 and the initialization periods Pib2 to Pib8 of the subfields SF2 to SF8.
- the amplitude is larger than the descending ramp waveform voltage (the descending ramp waveform voltage descending from the voltage 0 (V) to the negative voltage Vi4) generated in the third period Pi3.
- the voltage between the sustain electrodes SU1 to SUn and the scan electrodes SC1 to SCn is set to the discharge start voltage while the downward ramp waveform voltage is applied to the scan electrodes SC1 to SCn.
- the second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm and maintained so that the voltage between the data electrodes D1 to Dm and the scan electrodes SC1 to SCn exceeds the discharge start voltage.
- a third voltage (voltage 0 (V)) is applied to the electrodes SU1 to SUn.
- the positive wall voltage accumulated on the data electrodes D1 to Dm in the immediately preceding fifth period Pi5 is discharged in an excessive portion, and is suitable for generation of discharge in the subsequent x coordinate detection period Px. Adjusted to the wall voltage.
- the duration of the initialization discharge generated in the sixth period Pi6 is relatively long.
- the positive wall voltage remaining on the data electrodes D1 to Dm is applied to the first period Pi2 of the initialization period Pia1 of the subfield SF1 and the initialization periods Pib2 to Pib8 of the subfields SF2 to SF8. It can be adjusted to a value lower than the positive wall voltage remaining on the data electrodes D1 to Dm at the end of the three period Pi3.
- the sixth period Pi6 of the initialization period Picx ends.
- a voltage 0 (V) is applied to the data electrodes D1 to Dm, and a positive voltage Ve higher than the voltage 0 (V) is applied to the sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that falls from a voltage (for example, voltage 0 (V)) that is lower than the discharge start voltage to a negative voltage Va is applied to scan electrodes SC1 to SCn.
- This initialization discharge weakens the wall voltage on scan electrodes SC1 to SCn and the wall voltage on sustain electrodes SU1 to SUn.
- the voltage applied to the scan electrodes SC1 to SCn is set to the voltage Vc.
- the seventh period Pi7 of the initialization period Pico ends.
- the rising ramp waveform voltage is applied to the scan electrodes SC1 to SCn.
- the wall voltage varies between the discharge cells depending on the discharge history, the wall discharge voltage can be made almost uniform by this initialization discharge.
- the third period Pi3 and the fourth period Pi4 of the initialization periods Pib2 to Pib8 of the subfields SF2 to SF8, which are the selective initialization subfields Similarly, first, a weak initializing discharge is generated between the scan electrodes SC1 to SCn and the data electrodes D1 to Dm in the sixth period Pi6. Next, in the seventh period Pi7, the scan electrodes SC1 to SCn and the sustain electrodes SU1 to SC1 are generated. A weak initializing discharge is generated with SUn.
- the wall voltage is adjusted to a wall voltage suitable for the x coordinate detection pattern display operation in the subsequent x coordinate detection period Px. Further, priming particles that assist the generation of discharge in the x-coordinate detection period Px are generated in the discharge cell.
- the ultimate potential of the descending ramp waveform voltage is a negative voltage Va that has a lower voltage (larger absolute value) than the negative voltage Vi4.
- the positive wall voltage remaining on the data electrodes D1 to Dm becomes the end of the initialization periods Pia1, Pib2 to Pib8 of the subfields SF1 to SF8 which are image display subfields. Since it is adjusted to a low value compared to the time, a decrease in wall charge in the x coordinate detection period Px is relatively suppressed, and discharge in the x coordinate detection period Px can be more stably generated. Details of this will be described later.
- the above-mentioned drive voltage waveform generated in the initialization period Picx is a forced initialization waveform (second forced initialization waveform).
- the voltage 0 (V) is applied to the data electrodes D1 to Dm
- the voltage Ve is applied to the sustain electrodes SU1 to SUn
- the scan electrodes SC1 to SCn are applied.
- a voltage Vc is applied to SCn. Then, this state is maintained during the period Tx0.
- the period Tx0 is from the period Tw0 until the scan pulse is applied to the scan electrodes SC1 to SCn in the address periods Pw1 to Pw8 of the subfields SF1 to SF8 that are the image display subfields shown in FIG. Also set a long time.
- the period Tx0 is desirably set between 200 ⁇ sec and 1 msec, and is set to about 700 ⁇ sec in the present embodiment, for example.
- negative x-coordinate detection voltage Vax is applied to scan electrodes SC1 to SCn, and positive x-coordinate detection pulses of voltage Vdx are applied to data electrodes D1 to D3 in the first to third columns.
- the voltage Vdx of the x coordinate detection pulse is higher than the voltage 0 (V), and the x coordinate detection voltage Vax is a negative voltage lower than the voltage Vc.
- the pulse width of the x coordinate detection pulse is shown as Tx1.
- the data electrodes D1 to D3 correspond to a red discharge cell, a green discharge cell, and a blue discharge cell constituting one pixel, and the pixel is a pixel arranged at the left end of the image display area, for example. It is.
- the data electrodes D1 to D3 and the scan electrodes SC1 to SC1 In the discharge cell at the intersection of the data electrodes D1 to D3 to which the x coordinate detection pulse of the voltage Vdx is applied and the scan electrodes SC1 to SCn to which the x coordinate detection voltage Vax is applied, the data electrodes D1 to D3 and the scan electrodes SC1 to SC1 The voltage difference at the intersection with SCn exceeds the discharge start voltage, and discharge occurs between data electrodes D1 to D3 and scan electrodes SC1 to SCn and between sustain electrodes SU1 to SUn and scan electrodes SC1 to SCn. .
- discharge occurs in all the pixels constituting the first column, and these pixels emit light all at once.
- the 1080 pixels (3 columns ⁇ 1080 discharge cells) constituting the first column emit light all at once. And this light emission becomes light emission for x coordinate detection.
- discharge cell column an assembly of discharge cells constituting one column
- pixel column an assembly of discharge cells (pixel column) composed of three adjacent discharge cell columns
- the first pixel column that is, the first, second, and third discharge cell columns
- the x coordinate detection pulse of the voltage Vdx is applied to the data electrodes D4 to D6 in the fourth column to the sixth column.
- discharge occurs between the data electrodes D4 to D6 and the scan electrodes SC1 to SCn, and between the sustain electrodes SU1 to SUn and the scan electrodes SC1 to SCn, and the second pixel column (fourth column, Light emission for x-coordinate detection occurs in the fifth and sixth discharge cell columns).
- the same operation is performed in the order of data electrodes D7 to D9, data electrodes D10 to D12,..., Data electrodes Dm-2 to Dm, with the x coordinate detection voltage Vax being applied to the scan electrodes SC1 to SCn.
- the discharge cells of the m-th column are sequentially performed, and each pixel column from the third column to the last column (for example, 1920 column) is used for x-coordinate detection. Light emission is generated sequentially.
- the voltage Vc higher than the x-coordinate detection voltage Vax is applied to the scan electrodes SC1 to SCn, and the x-coordinate detection pulse.
- a voltage 0 (V) lower than the voltage Vdx is applied to the data electrodes D1 to Dm.
- the negative x coordinate detection voltage Vax is applied to the scan electrodes SC1 to SCn, and the positive x coordinate detection pulse of the voltage Vdx is applied to every three adjacent data electrodes D1 to Dm. Apply sequentially. In this way, light emission for x coordinate detection is sequentially generated in each pixel column from the first column to the last column.
- the x coordinate detection pattern is a pattern in which each pixel column from the first column to the last column in the image display area sequentially emits light for each column.
- the x-coordinate detection pattern is a pattern in which three discharge cell columns adjacent to each other sequentially emit light by three columns from the left end (first column) to the right end (m column) of the image display area. is there.
- the light pen receives the light emission of this pixel row.
- each pixel column from the first column to the last column in the image display region sequentially emits light for each column, so that the pen tip of the light pen is the image display region of the panel 10.
- the timing at which the light pen receives this light emission varies depending on where the light pen is.
- the x-coordinate of the position (x-coordinate, y-coordinate) of the light pen in the image display area is detected by detecting the light reception timing when the light emission is received by the light pen.
- the period during which the x-coordinate detection pattern is displayed on the panel 10 is very short. Therefore, the possibility that the x coordinate detection pattern is recognized by the user is low, and even if it is recognized by the user, it is only a slight change in luminance.
- the time for applying the x-coordinate detection pulse to each of the data electrodes D1 to Dm is Tx1.
- the above is the outline of the drive voltage waveforms of the y coordinate detection subfield SFy and the x coordinate detection subfield SFx.
- voltage Vc ⁇ 50 (V)
- voltage Vs 205 (V)
- voltage Vr 205 (V)
- voltage Ve 155 (V)
- the voltage Va, the voltage Vay, and the voltage Vax are set to be equal to each other, and the voltage Vd, the voltage Vdy, and the voltage Vdx are set to be equal to each other. Different voltages may be used.
- the voltage Vi2 of the rising ramp waveform voltage generated in the initialization period Pia1 of the subfield SF1 and the voltage Vi2 of the rising ramp waveform voltage generated in the initialization period Picx of the x-coordinate detection subfield SFx are equal to each other, but the voltages Vi2 may be set to different voltages.
- the gradient of the rising ramp waveform voltage generated in the initialization period Pia1 of the subfield SF1 and the initialization period Picx of the x coordinate detection subfield SFx is about 1.5 (V / ⁇ sec). Also, it occurs in the initialization periods Pia1, Pib2 to Pib8 of the image display subfield (subfields SF1 to SF8), the initialization period Piby of the y coordinate detection subfield SFy, and the initialization period Picx of the x coordinate detection subfield SFx.
- the gradient of the falling ramp waveform voltage is about ⁇ 2.5 (V / ⁇ sec).
- the gradient of the rising ramp waveform voltage generated at the end of each sustain period Ps1 to Ps8 of the image display subfield (subfields SF1 to SF8) is about 10 (V / ⁇ sec).
- the specific numerical values such as the voltage value and the gradient described above are merely examples, and the present invention is not limited to the numerical values described above for each voltage value and the gradient.
- Each voltage value, gradient, and the like are preferably set optimally based on the discharge characteristics of the panel and the specifications of the plasma display device.
- the ultimate potential of the falling ramp waveform voltage generated in the sixth period Pi6 of the initialization period Picx of the x-coordinate detection subfield SFx is lower than the negative voltage Vi4 (the absolute value is large).
- the negative polarity voltage Va is set, and the positive polarity wall voltage remaining on the data electrodes D1 to Dm is initialized at the end of the initialization period Pia1 of the subfield SF1 of the image display subfield or each of the subfields SF2 to SF8. It is adjusted to a value lower than the positive wall voltage remaining on the data electrodes D1 to Dm at the end of the periods Pib2 to Pib8.
- the above-described forced initialization operation is performed in the initialization period Picx of the x-coordinate detection subfield SFx.
- variation in wall voltage between each discharge cell can be reduced and the wall voltage of each discharge cell can be made more uniform. Therefore, a highly accurate x coordinate detection pattern with reduced variation in timing at the time of occurrence of discharge is provided on the panel. 10 can be displayed. Therefore, the x coordinate of the light pen position coordinate can be calculated with higher accuracy.
- the y coordinate detection subfield SFy and the x coordinate detection subfield SFx occur in this order.
- the order of occurrence of each subfield is not limited to this order.
- the y coordinate detection subfield SFy may be generated after the x coordinate detection subfield SFx.
- an image display subfield may be generated after the y coordinate detection subfield SFy and the x coordinate detection subfield SFx.
- the drive voltage waveform generated in the plasma display device in the present embodiment will be described.
- an example in which the waveform shape of the drive voltage waveform generated in the initialization period is different from the waveform shape shown in Embodiment Mode 1 will be described.
- one field has an image display subfield (for example, subfields SF1 to SF8), a timing detection subfield SFo, a y coordinate detection subfield SFy, and an x coordinate detection subfield SFx.
- Each subfield of the image display subfield has a luminance weight of (1, 34, 21, 13, 8, 8, 3, 3, 2).
- wireless communication is performed between the light pen and the plasma display device.
- the light pen calculates the position coordinates of the light pen inside the light pen, and transmits data of the calculated position coordinates from the light pen to the plasma display device by wireless communication.
- the light pen side When a signal is wirelessly transmitted from the light pen to the plasma display device, the light pen side must encode the transmission signal in a form that allows wireless communication and wirelessly transmit, and the plasma display device side must decode the received signal. Don't be. The same applies when a signal is wirelessly transmitted from the plasma display device to the light pen.
- the light pen wirelessly transmits a light reception signal to the plasma display apparatus and the plasma display apparatus receives the light reception signal and calculates the position coordinates. Therefore, it is preferable that the light pen itself calculates the position coordinates of the light pen and wirelessly transmits the calculated position coordinates to the plasma display device.
- the timing detection subfield SFo of the present embodiment is for enabling the light pen itself to generate a signal (coordinate reference signal) serving as a reference for detecting position coordinates with high accuracy.
- timing detection subfield SFo a timing detection subfield SFo, a y coordinate detection subfield SFy, and an x coordinate detection subfield SFx are provided in each field.
- the timing detection subfield SFo, the y coordinate detection subfield is described.
- SFy and x-coordinate detection subfield SFx are not necessarily provided in each field.
- the timing detection subfield SFo, the y-coordinate detection subfield SFy, and the x-coordinate detection subfield SFx may be generated at a rate of once per a plurality of fields in accordance with the video signal, the usage state of the plasma display device, and the like. .
- FIG. 5 is a diagram schematically showing an example of a drive voltage waveform applied to each electrode of panel 10 in the image display subfield according to the second embodiment of the present invention.
- FIG. 5 shows drive voltage waveforms of subfields SF1 to SF3 which are image display subfields.
- the subfield SF1 is a forced initialization subfield
- the subfields after the subfield SF2 are selective initialization subfields.
- Subfield SF3 and subsequent subfields generate substantially the same drive voltage waveform as that of subfield SF2, except for the number of sustain pulses.
- the subfield SF1 which is a forced initialization subfield
- the initialization period Pie1 of the subfield SF1 is divided into five periods of an eleventh period Pi11, a twelfth period Pi12, a thirteenth period Pi13, a fourteenth period Pi14, and a fifteenth period Pi15, and each period is described. To do.
- the voltage 0 (V) is applied to the sustain electrodes SU1 to SUn, and the voltage 0 (V) is applied to the data electrodes D1 to Dm. After that, set to high impedance state.
- the voltage Vi1 is applied after the voltage 0 (V) is applied, and an upward ramp waveform voltage that gradually rises from the voltage Vi1 to the voltage Vi2 is applied.
- the voltage Vi1 is set to a voltage lower than the discharge start voltage for the sustain electrodes SU1 to SUn, and the voltage Vi2 is set to a voltage exceeding the discharge start voltage for the sustain electrodes SU1 to SUn.
- negative wall voltage is accumulated on scan electrodes SC1 to SCn
- positive wall voltage is accumulated on data electrodes D1 to Dm and sustain electrodes SU1 to SUn. Further, priming particles that assist the generation of the address discharge are generated in the discharge cell.
- the data electrodes D1 to Dm are in a high impedance state after the voltage 0 (V) is applied, as the voltage applied to the scan electrodes SC1 to SCn rises, the voltage of the data electrodes D1 to Dm also increases. It gradually rises from 0 (V) in the positive direction.
- dielectric layer 15 is formed so as to cover scan electrodes SC 1 to SCn and sustain electrodes SU 1 to SUn, and protective layer 16 is formed on dielectric layer 15. Is formed.
- a dielectric layer 23 is formed so as to cover the data electrodes D1 to Dm, and a phosphor layer 25 is further formed thereon.
- the protective layer 16 has been used, for example, as a panel material in order to lower the discharge start voltage in the discharge cell, and has a large secondary electron emission coefficient and durability when neon (Ne) and xenon (Xe) gas is sealed. It is made of a material mainly composed of magnesium oxide (MgO) having excellent properties. On the other hand, the phosphor layer 25 has a smaller secondary electron emission coefficient than the protective layer 16.
- a discharge is generated first between scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn, where discharge is relatively likely to occur, and scan electrodes SC1 to SCn and data electrodes are generated using priming particles generated by the discharge.
- the initialization discharge can be generated stably. This is the reason why the data electrodes D1 to Dm are set to the high impedance state in the eleventh period Pi11 in which the rising ramp waveform voltage is applied to the scan electrodes SC1 to SCn and the initialization operation is performed.
- the voltage of scan electrodes SC1 to SCn is once lowered to voltage Vi3 lower than voltage Vi2, and then lowered to voltage 0 (V).
- the voltage Vi3 is set to a voltage lower than the voltage Vi2 and lower than the discharge start voltage with respect to the sustain electrodes SU1 to SUn.
- the voltage Vi3 may be a voltage that does not cause discharge in the discharge cell.
- FIG. 5 shows an example in which the voltage applied to scan electrodes SC1 to SCn is once lowered from voltage Vi2 to voltage Vi3 and then lowered to voltage 0 (V).
- the present invention is not limited to this configuration. Is not to be done.
- the voltage may be sharply decreased from the voltage Vi2 to the voltage 0 (V).
- a drive voltage waveform similar to that in the second period Pi12 of the initialization period Pia1 of the subfield SF1 shown in the first embodiment is generated and applied to each electrode. . That is, the voltage 0 (V) is applied to the data electrodes D1 to Dm, and the positive voltage Ve is applied to the sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that gently falls from a voltage (for example, voltage 0 (V)) lower than the discharge start voltage to a negative voltage Vi4 is applied to scan electrodes SC1 to SCn.
- Voltage Vi4 is set to a voltage exceeding the discharge start voltage with respect to sustain electrodes SU1 to SUn.
- the voltage applied to the scan electrodes SC1 to SCn is set to voltage 0 (V).
- the voltage 0 (V) is applied to the scan electrodes SC1 to SCn while the voltage 0 (V) is applied to the sustain electrodes SU1 to SUn and the data electrodes D1 to Dm.
- An upward ramp waveform voltage that gradually rises to Vr is applied.
- the voltage 0 (V) is applied to the data electrodes D1 to Dm and the positive voltage is applied to the sustain electrodes SU1 to SUn, as in the 12th period Pi12. Ve is applied.
- a downward ramp waveform voltage that gently falls from voltage 0 (V) to negative voltage Vi4 is applied to scan electrodes SC1 to SCn.
- the voltage applied to the scan electrodes SC1 to SCn is once set to the voltage 0 (V).
- the voltage Vd is applied to the data electrodes D1 to Dm, and the positive voltage Ve is applied to the sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that gently falls from voltage 0 (V) to negative voltage Vi6 is applied to scan electrodes SC1 to SCn.
- the negative voltage Vi6 is set to a voltage value higher than the negative voltage Vi4. Therefore, the absolute value of the voltage Vi6 is smaller than the absolute value of the voltage Vi4.
- the voltage Vi6 is about ⁇ 140 (V), for example, and the voltage Vi4 is about ⁇ 175 (V), for example.
- the voltage (voltage Vd ⁇ voltage Vi6) obtained by subtracting the voltage Vi6 from the voltage (here, the voltage Vd) applied to the data electrodes D1 to Dm in the fifteenth period Pi15 is the voltage in the fourteenth period Pi4.
- Each voltage is set to be higher than a voltage (voltage 0 (V) ⁇ voltage Vi4) obtained by subtracting the voltage Vi4 from the voltage applied to the data electrodes D1 to Dm (here, voltage 0 (V)).
- the voltage applied to the scan electrodes SC1 to SCn is set to the voltage Vc.
- the forced initialization operation in the initialization period Pie1 of the forced initialization subfield ends.
- the above-mentioned drive voltage waveform generated in the initialization period Pie1 is a forced initialization waveform (third forced initialization waveform).
- initialization discharge is forcibly generated in all the discharge cells in the image display area of the panel 10.
- the wall voltage varies between the discharge cells depending on the discharge history, the wall voltage of each discharge cell can be made substantially uniform by this forced initialization operation.
- the subsequent write period Pw1 and sustain period Ps1 have substantially the same configuration and the same operation as the write period Pw1 and sustain period Ps1 of the subfield SF1 shown in the first embodiment, and thus description thereof is omitted.
- the selective initialization subfield will be described by taking the subfield SF2 as an example.
- the initialization periods Pif3 to Pif8 after the subfield SF3 a driving voltage waveform similar to that in the initialization period Pif2 of the subfield SF2 is generated and applied to each electrode, and a selective initialization operation is performed.
- the second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm
- the third voltage (voltage 0 (voltage 0 (V)) is applied to the sustain electrodes SU1 to SUn. V)) is applied.
- a downward ramp waveform voltage that drops from a voltage that is lower than the discharge start voltage (for example, voltage 0 (V)) to a first voltage (negative voltage Vi4) is applied to scan electrodes SC1 to SCn.
- the voltage between the sustain electrodes SU1 to SUn and the scan electrodes SC1 to SCn is set to the discharge start voltage while the downward ramp waveform voltage is applied to the scan electrodes SC1 to SCn.
- the second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm and maintained so that the voltage between the data electrodes D1 to Dm and the scan electrodes SC1 to SCn exceeds the discharge start voltage.
- a third voltage (voltage 0 (V)) is applied to the electrodes SU1 to SUn.
- the positive wall voltage accumulated on the data electrode Dk by the last sustain discharge is adjusted to a wall voltage suitable for the address operation by discharging an excessive portion by this initializing discharge.
- the initialization discharge does not occur, and the wall voltage at the end of the initialization period Pie1 of the subfield SF1 is maintained.
- the voltage waveform applied to the scan electrodes SC1 to SCn in the sixteenth period Pi16 is temporarily stopped before the falling ramp waveform voltage reaches the voltage Vi4.
- the waveform is made to maintain the current voltage (or make the voltage drop more gradual).
- the discharge generated between the scan electrode SCi and the data electrode Dk is temporarily stopped.
- the voltage starts to decrease again, and discharge is generated again between the scan electrode SCi and the data electrode Dk.
- the wall voltage may vary between a discharge cell in which the discharge is generated relatively early and a discharge cell in which the discharge is generated late. There is.
- the downward ramp waveform voltage having the waveform shown in FIG. 5 is applied to the scan electrodes SC1 to SCn to temporarily discharge. Performs selective initialization to stop generation.
- the period of the pause (the above-mentioned predetermined period) is preferably set to 5 ⁇ sec or more, and is set to about 10 ⁇ sec as an example in the present embodiment.
- the voltage at which the falling of the descending ramp waveform voltage is temporarily stopped may be appropriately set according to the characteristics of the panel 10, the specifications for driving the panel 10, and the like.
- the descending temporary stop voltage is set to, for example, about ⁇ 140 (V) which is a voltage equal to Vi6.
- the voltage applied to the scan electrodes SC1 to SCn is once set to the voltage 0 (V).
- the sixteenth period Pi16 of the initialization period Pif2 ends.
- the voltage Vd is applied to the data electrodes D1 to Dm, and the positive voltage Ve is applied to the sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that gently falls from voltage 0 (V) to negative voltage Vi6 is applied to scan electrodes SC1 to SCn.
- the negative voltage Vi6 is higher than the negative voltage Vi4. Therefore, the absolute value of the voltage Vi6 is smaller than the absolute value of the voltage Vi4.
- This initialization discharge weakens the wall voltage on scan electrode SCi and the wall voltage on sustain electrode SUi.
- a weak setup discharge is generated between the scan electrode SCi and the data electrode Dk, and in the discharge cell in which the wall voltage is appropriately adjusted, between the scan electrode SCi and the data electrode Dk. This voltage does not exceed the discharge start voltage, and no discharge occurs between the scan electrode SCi and the data electrode Dk.
- the voltage (voltage Vd ⁇ voltage Vi6) obtained by subtracting the voltage Vi6 from the voltage (here, the voltage Vd) applied to the data electrodes D1 to Dm in the seventeenth period Pi17 is the voltage in the sixteenth period Pi16.
- Each voltage is set to be higher than a voltage (voltage 0 (V) ⁇ voltage Vi4) obtained by subtracting the voltage Vi4 from the voltage applied to the data electrodes D1 to Dm (here, voltage 0 (V)).
- the voltage applied to the scan electrodes SC1 to SCn is set to the voltage Vc.
- the seventeenth period Pi17 of the initialization period Pif2 ends.
- FIG. 5 shows a configuration in which the voltage Vd is applied to the data electrodes D1 to Dm from the middle of applying the downward ramp waveform voltage to the scan electrodes SC1 to SCn
- the present invention is not limited to this configuration.
- the voltage Vd may be applied to the data electrodes D1 to Dm during the period in which the downward ramp waveform voltage is applied to the scan electrodes SC1 to SCn.
- the timing at which the voltage Vd is applied to the data electrodes D1 to Dm may be set appropriately so as to achieve the above-described purpose.
- the above-described drive voltage waveform generated in the initialization period Pif2 is a selection initialization waveform (second selection initialization waveform).
- the voltage Vi4, the voltage Vi6, the voltage Vd, and the voltage Ve are set to voltage values that satisfy the above-described operation according to the characteristics of the panel 10, the specifications of the plasma display device 100, and the like.
- the subsequent write period Pw2 and sustain period Ps2 have substantially the same configuration and the same operation as the write period Pw2 and sustain period Ps2 of the subfield SF2 shown in the first embodiment, and thus description thereof is omitted.
- each subfield after the subfield SF3 in the initialization periods Pif3 to Pif8 and the write periods Pw3 to Pw8, the same drive voltage waveform as that in the initialization period Pif2 and the write period Pw2 of the subfield SF2 is applied to each electrode.
- the subfield for performing the forced initialization operation is the subfield SF1, but the present invention is not limited to this configuration.
- the subfield in which the forced initialization operation is performed may be a subfield after subfield SF2.
- timing detection subfield SFo the timing detection subfield SFo, the y coordinate detection subfield SFy, and the x coordinate detection subfield SFx in the present embodiment will be described.
- FIG. 6 schematically shows an example of a drive voltage waveform applied to each electrode of panel 10 in timing detection subfield SFo, y coordinate detection subfield SFy, and x coordinate detection subfield SFx in the second embodiment of the present invention.
- FIG. 6 shows drive voltages applied to sustain electrodes SU1 to SUn, scan electrodes SC1 to SCn, and data electrodes D1 to Dm in timing detection subfield SFo, y coordinate detection subfield SFy, and x coordinate detection subfield SFx. Waveform is shown.
- FIG. 6 also shows a part of the sustain period Ps8 of the subfield SF8 immediately before the timing detection subfield SFo and a part of the subfield SF1.
- the timing detection subfield SFo has an initialization period Pigo, an address period Pwo, and a timing detection period Po.
- the initialization period Pigo a forced initialization operation is performed.
- a drive voltage waveform different from that in the initialization period Pie1 of the subfield SF1 of the image display subfield is applied to each electrode.
- voltage 0 (V) is applied to sustain electrodes SU1 to SUn, and data electrodes D1 to Dm are set to a high impedance state after voltage 0 (V) is applied.
- the voltage Vi1 is applied after the voltage 0 (V) is applied, and an upward ramp waveform voltage that gradually rises from the voltage Vi1 to the voltage Vi2 is applied.
- Voltage Vi1 is set to a voltage lower than the discharge start voltage with respect to sustain electrodes SU1 to SUn.
- the voltage Vi2 is set to a voltage exceeding the discharge start voltage with respect to the sustain electrodes SU1 to SUn, and is set to a voltage higher than a voltage Vso of a timing detection pulse described later. This is for surely generating the initializing discharge.
- the rising ramp waveform voltage has a waveform shape that rises to the same voltage Vi2 with the same gradient as the rising ramp waveform voltage generated in the eleventh period Pi11 of the initialization period Pie1.
- negative wall voltage is accumulated on scan electrodes SC1 to SCn
- positive wall voltage is accumulated on data electrodes D1 to Dm and sustain electrodes SU1 to SUn. Further, priming particles that assist the generation of the address discharge are generated in the discharge cell.
- the data electrodes D1 to Dm are in a high impedance state after the voltage 0 (V) is applied, as the voltage applied to the scan electrodes SC1 to SCn rises, the voltage of the data electrodes D1 to Dm also increases. It gradually rises from 0 (V) in the positive direction.
- discharge between scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn occurs before discharge between scan electrodes SC1 to SCn and data electrodes D1 to Dm.
- the initialization discharge is stably generated for the reason described in the first embodiment.
- negative wall voltage is accumulated on scan electrodes SC1 to SCn
- positive wall voltage is accumulated on data electrodes D1 to Dm and sustain electrodes SU1 to SUn. Furthermore, priming particles that assist the generation of the subsequent address discharge are generated in the discharge cell.
- the voltage applied to scan electrodes SC1 to SCn reaches voltage Vi2
- the voltage of scan electrodes SC1 to SCn is once lowered to voltage Vi3 lower than voltage Vi2, and then lowered to voltage 0 (V).
- the present invention is not limited to this configuration.
- the voltage may be sharply decreased from voltage Vi2 to voltage 0 (V).
- the same drive voltage waveforms as those in the sixteenth period Pi16 and the seventeenth period Pi17 of the initialization periods Pif2 to Pif8 of the subfields SF2 to SF8 are applied to the electrodes.
- an initializing discharge is generated between the scan electrodes SC1 to SCn and the data electrodes D1 to Dm in the nineteenth period Pi19, and then in the twentieth period Pi20, the scan electrodes SC1 to SCn and the sustain electrodes SU1 to SUn. An initializing discharge is generated during this period.
- the second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm
- the third voltage (voltage 0 (V)) is applied to the sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that drops from a voltage that is less than the discharge start voltage (for example, voltage 0 (V)) to a first voltage (negative voltage Vi4) is applied to scan electrodes SC1 to SCn.
- This downward ramp waveform voltage has the same waveform shape as the downward ramp waveform voltage generated in the sixteenth period Pi16 of the initialization period Pif2. That is, it has a waveform shape that once stops the voltage drop before the falling ramp waveform voltage reaches the voltage Vi4 and maintains the voltage at that time (or makes the voltage drop more gradual).
- the voltage applied to the scan electrodes SC1 to SCn is once set to the voltage 0 (V).
- the voltage Vd is applied to the data electrodes D1 to Dm, and the positive voltage Ve is applied to the sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that gently falls from voltage 0 (V) to negative voltage Vi6 is applied to scan electrodes SC1 to SCn.
- This initialization discharge weakens the wall voltage on scan electrodes SC1 to SCn and the wall voltage on sustain electrodes SU1 to SUn.
- the voltage applied to the scan electrodes SC1 to SCn is set to the voltage Vc.
- a weak initialization discharge is generated between the scan electrodes SC1 to SCn and the data electrodes D1 to Dm in the 19th period Pi19, and then the 20th period.
- Pi20 generates a weak initializing discharge between scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn.
- the forced initialization operation in the initialization period Pigo of the timing detection subfield SFo is completed.
- the above-described drive voltage waveform generated during the initialization period Pigo is a forced initialization waveform (fourth forced initialization waveform).
- an initializing discharge is forcibly generated in all the discharge cells in the image display area of the panel 10.
- the wall voltage varies between the discharge cells depending on the discharge history, the wall voltage of each discharge cell can be made substantially uniform by this forced initialization operation.
- the wall voltage in each discharge cell is adjusted to a wall voltage suitable for the address operation in the subsequent address period Pwo, and priming particles that assist the generation of the address discharge are generated in the discharge cell.
- the voltage 0 (V) is applied to the data electrodes D1 to Dm
- the voltage Ve is applied to the sustain electrodes SU1 to SUn
- the voltage Vc is applied to the scan electrodes SC1 to SCn.
- an address pulse of the voltage Vd is applied to the data electrodes D1 to Dm and a scan pulse of the voltage Va is applied to the scan electrodes SC1 to SCn to generate an address discharge in each discharge cell.
- a scan pulse is sequentially applied to a plurality of electrodes (or one electrode at a time). Further, the address pulse is applied to all the data electrodes D1 to Dm until the scan pulse is completely applied to the scan electrodes SC1 to SCn.
- a write pulse of voltage Vd is applied to the data electrodes D1 to Dm all at once and the scan electrodes SC1 to SCn are applied.
- a scanning pulse of voltage Va may be applied simultaneously to cause all discharge cells in the image display area of panel 10 to generate address discharges simultaneously.
- the voltage 0 (V) is applied to the data electrodes D1 to Dm. Further, voltage Vc is applied to scan electrodes SC1 to SCn, and then voltage 0 (V) is applied. Further, the voltage applied to sustain electrodes SU1 to SUn is changed from voltage Ve to voltage 0 (V) at substantially the same timing as voltage 0 (V) is applied to scan electrodes SC1 to SCn. In the present embodiment, this state is maintained from time to0 to time To0. Therefore, during this period, after the last address discharge occurs in the discharge cells, a state in which no discharge occurs is maintained. Time to0 is the time when the scan pulse for generating the last address discharge is applied to scan electrode SCn.
- time To0 is set based on the time interval of the timing detection discharge mentioned later. That is, the time To0 is set to a time longer than any of the time To1, the time To2, and the time To3 described later. In the present embodiment, the time To0 is about 50 ⁇ sec, for example.
- the panel 10 is caused to emit a plurality of times of light emission (light emission for timing detection) as a reference when calculating the position coordinates of the light pen. That is, light emission for timing detection is emitted to all the discharge cells in the image display area of the panel 10 at a predetermined time interval (in this embodiment, for example, time To1, time To2, and time To3 in this embodiment).
- the timing detection discharge to be generated is generated a plurality of times (in this embodiment, for example, four times).
- timing detection pulse V1 of voltage Vso is applied to scan electrodes SC1 to SCn.
- first timing detection discharge is generated in all the discharge cells in the image display area of the panel 10, and the entire image display surface of the panel 10 emits light (first timing detection light emission).
- timing detection pulse V3 of voltage Vso is applied to scan electrodes SC1 to SCn.
- the third timing detection discharge is generated in all the discharge cells in the image display region of the panel 10, and the entire image display surface of the panel 10 emits light (third timing detection light emission).
- a predetermined time interval in the present embodiment, for example, time To1, time To2, and time To3 in this embodiment
- time To1, time To2, and time To3 in this embodiment is multiple times (in this embodiment, for example, 4 Timing detection discharge is generated, and the entire image display surface of the panel 10 is caused to emit light a plurality of times (for example, four times) at predetermined time intervals (for example, time To1, time To2, and time To3).
- the light pen receives this light emission.
- the entire surface of the image display surface of the panel 10 shines at the same timing, so the light pen is at the same timing no matter where the pen tip of the light pen is in the image display area of the panel 10. This light emission can be received.
- the time To1 is about 40 ⁇ sec
- the time To2 is about 20 ⁇ sec
- the time To3 is about 30 ⁇ sec.
- the present invention is not limited to the numerical values described above for the times To0 to To3, and each time may be set appropriately according to the specifications of the plasma display system.
- the light pen detects a coordinate reference signal (light pen) when light emission is detected a plurality of times (for example, four times) generated at predetermined time intervals (for example, time To1, time To2, and time To3).
- a coordinate reference signal for example, four times
- predetermined time intervals for example, time To1, time To2, and time To3.
- an erase operation similar to the erase operation performed at the end of the sustain period Ps1 of the subfield SF1 is performed. . That is, an upward ramp waveform voltage that gently rises from voltage 0 (V) to voltage Vr is applied to scan electrodes SC1 to SCn while voltage 0 (V) is applied to sustain electrodes SU1 to SUn and data electrodes D1 to Dm. . When the rising ramp waveform voltage reaches the voltage Vr, the voltage applied to the scan electrodes SC1 to SCn is lowered to the voltage 0 (V). Thereby, a weak erasure discharge is generated in all the discharge cells in the image display area of the panel 10.
- the voltage Vso is set to a voltage equal to the voltage Vs.
- the voltage Vso is about 205 (V).
- the voltage Vso may be a voltage different from the voltage Vs.
- the voltage Vso may be any voltage that generates timing detection discharge.
- a y-coordinate detection subfield SFy and an x-coordinate detection subfield SFx are generated.
- the initialization period Pfy is composed of the sixteenth period Pi16 and the seventeenth period Pi17 as in the initialization periods Pif2 to Pif8.
- an initializing discharge is generated between the scan electrode SCi and the data electrode Dk in the sixteenth period Pi16, and then an initializing discharge is generated between the scan electrode SCi and the sustain electrode SUi in the seventeenth period Pi17.
- a drive voltage waveform (second selective initialization waveform) substantially the same as that in each of the initialization periods Pif2 to Pif8 of the subfields SF2 to SF8 is generated and applied to each electrode.
- a drive voltage waveform similar to that in the sixteenth period Pi16 of the initialization periods Pif2 to Pif8 is generated and applied to each electrode.
- a second voltage (voltage 0 (V)) is applied to data electrodes D1 to Dm, and a third voltage (voltage 0 (V)) is applied to sustain electrodes SU1 to SUn.
- the scan electrodes SC1 to SCn have a downward ramp waveform voltage that temporarily stops falling while the voltage is lower than the discharge start voltage (eg, voltage 0 (V)) to the first voltage (negative voltage Vi4). Is applied.
- a drive voltage waveform similar to that in the seventeenth period Pi17 of the initialization periods Pif2 to Pif8 is generated and applied to each electrode.
- a voltage Vd is applied to the data electrodes D1 to Dm, and a positive voltage Ve higher than the voltage 0 (V) is applied to the sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that falls from a voltage (for example, voltage 0 (V)) that is lower than the discharge start voltage to a negative voltage Vi6 is applied to scan electrodes SC1 to SCn.
- the timing detection discharge is generated in all the discharge cells in the image display area of the panel 10, so that in the initialization period Pfy, the sixteenth In both the period Pi16 and the seventeenth period Pi17, a weak initializing discharge is generated in all the discharge cells. That is, in the sixteenth period Pi16 of the initialization period Pify, an initialization discharge is generated between the scan electrodes SC1 to SCn and the data electrodes D1 to Dm, and in the seventeenth period Pi17 of the initialization period Pify, the scan electrodes SC1 to SCn Initializing discharge is generated between sustain electrodes SU1 to SUn.
- the wall voltage is adjusted to a wall voltage suitable for the y coordinate detection pattern display operation in the subsequent y coordinate detection period Py in all the discharge cells in the image display area of the panel 10. Furthermore, priming particles that assist the generation of discharge in the y-coordinate detection period Py are generated in the discharge cell.
- the subsequent y-coordinate detection period Py has substantially the same configuration and the same operation as the y-coordinate detection period Py of the y-coordinate detection subfield SFy shown in the first embodiment, and a description thereof will be omitted.
- the initialization period Pihx of the x-coordinate detection subfield SFx a forced initialization operation substantially similar to the initialization period Pigo of the timing detection subfield SFo is performed. That is, the initialization period Pihx is composed of three periods, a twenty-first period Pi21, a twenty-second period Pi22, and a twenty-third period Pi23, similarly to the initialization period Pigo. Therefore, in the initialization period Pihx, a drive voltage waveform substantially the same as that in the initialization period Pigo of the timing detection subfield SFo is generated and applied to each electrode.
- the reaching potential of the downward ramp waveform voltage generated in the 22nd period Pi22 is the fourth voltage (voltage Va) having a voltage value lower (larger absolute value) than the first voltage (voltage Vi4). That is, the downward ramp waveform voltage generated in the 22nd period Pi22 has a larger amplitude than the downward ramp waveform voltage generated in the 19th period Pi19 of the initialization period Pigo. This is different from the downward ramp waveform voltage generated in the nineteenth period Pi19 of the initialization period Pigo. Therefore, the drive voltage waveform generated in the initialization period Pihx of the x-coordinate detection subfield SFx is set as the fifth forced initialization waveform.
- voltage 0 (V) is applied to sustain electrodes SU1 to SUn, and data electrodes D1 to Dm are set to a high impedance state after voltage 0 (V) is applied.
- the voltage Vi1 is applied after the voltage 0 (V) is applied, and an upward ramp waveform voltage that gradually rises from the voltage Vi1 to the voltage Vi2 is applied.
- Voltage Vi1 is set to a voltage lower than the discharge start voltage with respect to sustain electrodes SU1 to SUn.
- the voltage Vi2 is set to a voltage exceeding the discharge start voltage with respect to the sustain electrodes SU1 to SUn, and is set to a voltage higher than the voltage Vso of the timing detection pulse.
- negative wall voltage is accumulated on scan electrodes SC1 to SCn
- positive wall voltage is accumulated on data electrodes D1 to Dm and sustain electrodes SU1 to SUn. Furthermore, priming particles that assist the generation of discharge in the subsequent x-coordinate detection period Px are generated in the discharge cell.
- the downward ramp waveform voltage generated in the 19th period Pi19 of the initialization period Pigo has a waveform shape similar to that of the downward slope, but falls at the same slope, but the downward slope has a larger amplitude than that.
- a waveform voltage is applied to scan electrodes SC to SCn.
- the second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm
- the third voltage (voltage 0 (V)) is applied to the sustain electrodes SU1 to SUn.
- Scan electrodes SC1 to SCn have a voltage value lower than the first voltage (negative voltage Vi4) from a voltage that is lower than the discharge start voltage (for example, voltage 0 (V)) (the absolute value is larger).
- a downward ramp waveform voltage falling to a voltage of 4 (negative voltage Va) is applied. Then, the downward ramp waveform voltage temporarily stops decreasing in the middle.
- the negative voltage Va has a lower voltage value than the negative voltage Vi4. That is, the absolute value of the voltage Va is larger than the absolute value of the voltage Vi4.
- the voltage Va is about ⁇ 200 (V), for example, and the voltage Vi4 is about ⁇ 175 (V), for example.
- the downward ramp waveform voltage generated in the 22nd period Pi22 is the downward ramp waveform voltage generated in the 19th period Pi19 of the initialization period Pigo (the downward ramp waveform voltage falling from the voltage 0 (V) to the negative voltage Vi4). ) Is larger than. This is different from the forced initialization waveform (fifth forced initialization waveform) generated in the initialization period Pigo.
- the voltage between the sustain electrodes SU1 to SUn and the scan electrodes SC1 to SCn does not exceed the discharge start voltage while the downward ramp waveform voltage is applied to the scan electrodes SC1 to SCn.
- the second voltage (voltage 0 (V)) is applied to the data electrodes D1 to Dm so that the voltage between the data electrodes D1 to Dm and the scan electrodes SC1 to SCn exceeds the discharge start voltage, and the sustain electrode SU1.
- a third voltage (voltage 0 (V)) is applied to SUn.
- the positive wall voltage accumulated on the data electrodes D1 to Dm in the immediately preceding twenty-first period Pi21 is suitable for generation of discharge in the subsequent x-coordinate detection period Px because the excessive portion is discharged. Adjusted to the wall voltage.
- the discharge duration is increased.
- the positive wall voltage remaining on the data electrodes D1 to Dm is changed to the end of the initialization period Pie1 of the subfield SF1 or the end of the initialization periods Pif2 to Pif8 of the subfields SF2 to SF8 (or the timing). It can be adjusted to a value lower than the positive wall voltage remaining on the data electrodes D1 to Dm at the end of the initialization period Pigo of the detection subfield SFo. The reason for such adjustment is to suppress a decrease in wall charge in the x coordinate detection period Px as described in the first embodiment.
- the voltage applied to the scan electrodes SC1 to SCn is once set to the voltage 0 (V).
- the same drive voltage waveform as that in the 20th period Pi20 of the initialization period Pigo is applied to each electrode. That is, the voltage Vd is applied to the data electrodes D1 to Dm, and the positive voltage Ve higher than the voltage 0 (V) is applied to the sustain electrodes SU1 to SUn.
- a downward ramp waveform voltage that falls from a voltage (for example, voltage 0 (V)) that is lower than the discharge start voltage to a negative voltage Vi6 is applied to scan electrodes SC1 to SCn.
- This initialization discharge weakens the wall voltage on scan electrodes SC1 to SCn and the wall voltage on sustain electrodes SU1 to SUn.
- the voltage applied to the scan electrodes SC1 to SCn is set to the voltage Vc.
- the above-mentioned drive voltage waveform generated in the initialization period Pihx is a forced initialization waveform (fifth forced initialization waveform).
- initialization discharge is forcibly generated in all the discharge cells in the image display area of the panel 10.
- the wall voltage of each discharge cell can be made substantially uniform by this forced initialization operation.
- the wall voltage is adjusted to a wall voltage suitable for the x coordinate detection pattern display operation in the subsequent x coordinate detection period Px. Furthermore, priming particles that assist the generation of discharge in the x-coordinate detection period Px are generated in the discharge cell.
- the subsequent x-coordinate detection period Px has substantially the same configuration and the same operation as the x-coordinate detection period Px of the x-coordinate detection subfield SFx shown in the first embodiment, and a description thereof will be omitted.
- the gradient of the rising ramp waveform voltage generated in the initialization period Pie1 of the subfield SF1, the initialization period Pigo of the timing detection subfield SFo, and the initialization period Pihx of the x coordinate detection subfield SFx is about 1.5 (V / ⁇ sec).
- the gradient of the falling ramp waveform voltage generated in the initialization period Pihx of the detection subfield SFx is about ⁇ 2.5 (V / ⁇ sec).
- the gradient of the rising ramp waveform voltage generated at the end of each sustain period Ps1 to Ps8 of the image display subfield (subfields SF1 to SF8) and at the end of the sustain period Po of the timing detection subfield SFo is about 10 (V / ⁇ sec). ).
- the voltage Vi2 of the upward ramp waveform voltage generated in the initialization period Pigo is used as the timing detection pulse. Is set to a voltage higher than the voltage Vso.
- an upward ramp waveform voltage voltage Vi2 generated in the initialization period Pie1 of the subfield SF1 an upward ramp waveform voltage voltage Vi2 generated in the initialization period Pigo of the timing detection subfield SFo, and
- the voltage Vi2 of the rising ramp waveform voltage generated in the initialization period Pihx of the x-coordinate detection subfield SFx is the same voltage, but each voltage Vi2 may be set to a different voltage.
- the timing detection subfield SFo is provided in one field, and the reason why each drive voltage waveform of the timing detection subfield SFo is generated with the waveform shape shown in FIG. 6 is as follows.
- This coordinate reference signal is a signal indicating the generation timing of the y-coordinate detection pattern generated during the y-coordinate detection period Py and the x-coordinate detection pattern generated during the x-coordinate detection period Px. This is a signal representing a timing (time) which is a reference when calculating (coordinates).
- a timing detection subfield SFo is provided in one field so that the light pen itself can generate a coordinate reference signal.
- the light pen detects light emission generated at a specific time interval on the panel 10 by timing detection discharge, and generates a coordinate reference signal. Based on this coordinate reference signal, the light pen calculates the position coordinates of the light pen itself.
- each drive voltage waveform of the timing detection subfield SFo is generated in the waveform shape shown in FIG.
- timing detection pulses are alternately applied to the scan electrodes SC1 to SCn and the sustain electrodes SU1 to SUn at predetermined time intervals (for example, time To1, time To2, and time To3), Timing detection discharge is generated a plurality of times (for example, four times) at predetermined time intervals (for example, a time To0, a time To1, a time To2, and a time To3), and the image display surface of the panel 10 is displayed a plurality of times ( For example, light is emitted four times. Then, the time To0 is set to a time longer than the time To1. Desirably, the time To0 is set to a time longer than any of the time To1, the time To2, and the time To3. This is due to the following reasons.
- the light receiving element of the light pen has the capability of detecting light emission generated by the y coordinate detection pattern and light emission generated by the x coordinate detection pattern.
- the emitted light has a light emission intensity comparable to that generated by the address discharge. Therefore, the light receiving element also detects light emission generated by the address discharge. Therefore, depending on the set value of time To0, the light pen may misrecognize the light emission generated by the address discharge in the address period Pwo of the timing detection subfield SFo as the light emission by the timing detection discharge.
- the time To0 is set to a time longer than the time To1, no matter where the light pen is in the image display area, the time from the time when the light pen detects light emission due to the write discharge to the time to1 The interval is longer than time To1. Thereby, it is possible to prevent the light pen from erroneously recognizing light emission due to the address discharge generated in the address period Pwo of the timing detection subfield SFo as light emission due to the timing detection discharge. If the time To0 is set to a time longer than any of the time To1, the time To2, and the time To3, the erroneous recognition can be prevented with higher accuracy, and the write in the image display area can be prevented. It becomes possible to detect the position (position coordinates) of the pen more accurately.
- the initialization period Pigo of the timing detection subfield SFo is divided into three periods of an 18th period Pi18, a 19th period Pi19, and a 20th period Pi20, and the drive voltage waveform shown in FIG.
- a forced initialization operation is performed by applying to the electrodes. That is, in the eighteenth period Pi18, the rising ramp waveform voltage is applied to the scan electrodes SC1 to SCn to forcibly generate the initializing discharge in all the discharge cells in the image display region of the panel 10.
- a downward ramp waveform voltage is applied to scan electrodes SC1 to SCn, and a weak initializing discharge is generated between scan electrodes SC1 to SCn and data electrodes D1 to Dm.
- the voltage Ve is applied to the sustain electrodes SU1 to SUn and the downward ramp waveform voltage is applied to the scan electrodes SC1 to SCn, so that the weak voltage is generated between the scan electrodes SC1 to SCn and the sustain electrodes SU1 to SUn. An initializing discharge is generated.
- the initialization period of the subfield SF1 in which the forced initialization operation is performed with the drive voltage waveform shown in FIG. It is possible to reduce the wall voltage variation between the discharge cells with higher accuracy than Pie1, and make the wall voltage of each discharge cell more uniform.
- the light pen can generate a highly accurate coordinate reference signal with reduced variations.
- the y coordinate detection pattern displayed on the panel 10 immediately before the x coordinate detection subfield SFx is a moving image in which one horizontal line that emits light sequentially moves from the upper end to the lower end of the image display area of the panel 10. . Therefore, there is a difference according to the arrangement position of the discharge cells in the time from the end of light emission to the start of the x coordinate detection subfield SFx. Since the wall voltage changes with the passage of time, the wall voltage may vary between the discharge cells immediately before the x-coordinate detection subfield SFx.
- the initialization period Pihx of the x-coordinate detection subfield SFx is divided into three periods in the same manner as the initialization period Pigo of the timing detection subfield SFo, and the initialization discharge due to the falling ramp waveform voltage Perform a forced initialization operation with a longer duration.
- variation in wall voltage between each discharge cell can be reduced and the wall voltage of each discharge cell can be made more uniform. Therefore, a highly accurate x coordinate detection pattern with reduced variation in timing at the time of occurrence of discharge is provided on the panel. 10 can be displayed.
- the dark current can be suppressed and the wall charge can be prevented from decreasing, so that a more accurate x coordinate detection pattern can be displayed on the panel 10. Therefore, the light pen can calculate the x coordinate of the position coordinates with higher accuracy.
- the timing immediately before the y-coordinate detection subfield SFy is a timing detection period Po, and in the timing detection period Po, all discharge cells generate a timing discharge at the same time. There is relatively little variation in wall voltage. Therefore, there is no problem even if the initialization operation in the initialization period Pfy of the y coordinate detection subfield SFy is a selective initialization operation.
- the timing detection discharge in the timing detection period Po, the discharge for displaying the y-coordinate detection pattern on the panel 10, and the discharge for displaying the x-coordinate detection pattern on the panel 10 are calculated with the position coordinates in the light pen.
- the discharge for detecting the position (positional coordinate) of the light pen in the image display area while displaying an image corresponding to the image signal on the panel 10 by the above-described operation. Can be generated stably, and the position coordinates of the light pen can be calculated with high accuracy.
- FIG. 7 is a diagram schematically showing an example of a circuit block and a plasma display system 30 constituting the plasma display device 100 according to the second embodiment of the present invention.
- the plasma display system 30 shown in the present embodiment includes a plasma display device 100 and a light pen 50 as components.
- the plasma display device 100 includes a panel 10 and a driving circuit that drives the panel 10 with a plurality of subfields in one field.
- the drive circuit supplies power necessary for the image signal processing circuit 31, the data electrode drive circuit 32, the scan electrode drive circuit 33, the sustain electrode drive circuit 34, the timing generation circuit 35, the drawing circuit 44, the reception circuit 46, and each circuit block.
- a power supply circuit (not shown) for supplying is provided.
- the panel 10 in the present embodiment has the same structure as the panel 10 shown in the first embodiment and operates in the same manner, and thus the description thereof is omitted.
- the image signal processing circuit 31 receives an image signal, a drawing signal output from the drawing circuit 44, and a timing signal supplied from the timing generation circuit 35.
- the image signal processing circuit 31 combines the image signal and the drawing signal in order to display an image obtained by combining the image signal and the drawing signal on the panel 10, and applies red, green to each discharge cell based on the combined signal.
- Blue gradation values (gradation values expressed by one field) are set.
- the image signal processing circuit 31 uses the red, green, and blue gradation values set for each discharge cell as image data indicating lighting / non-lighting for each subfield (light emission / non-light emission is “1” of the digital signal).
- Data corresponding to “0”) and output the image data (red image data, green image data, and blue image data).
- the timing generation circuit 35 generates various timing signals for controlling the operation of each circuit block based on the horizontal synchronization signal and the vertical synchronization signal.
- the generated timing signal is supplied to each circuit block (data electrode drive circuit 32, scan electrode drive circuit 33, sustain electrode drive circuit 34, image signal processing circuit 31, etc.).
- the data electrode drive circuit 32 Based on the image data output from the image signal processing circuit 31 and the timing signal supplied from the timing generation circuit 35, the data electrode drive circuit 32 writes the write pulse of the voltage Vd corresponding to each of the data electrodes D1 to Dm, the y coordinate. A detection voltage Vdy and an x-coordinate detection pulse of the voltage Vdx are generated. Then, the data electrode driving circuit 32 applies the write pulse of the voltage Vd to the y coordinate detection subfield in the write periods Pw1 to Pw8 of the subfields SF1 to SF8 that are image display subfields and the write period Pwo of the timing detection subfield SFo.
- the y coordinate detection voltage Vdy in the y coordinate detection period Py of the field SFy, the voltage Vd in the initialization period Pihx of the x coordinate detection subfield SFx, and the voltage Vdx in the x coordinate detection period Px of the x coordinate detection subfield SFx. are applied to the data electrodes D1 to Dm.
- Sustain electrode drive circuit 34 includes a sustain pulse generation circuit and a circuit (not shown in FIG. 5) for generating voltage Ve, and generates each drive voltage waveform based on the timing signal supplied from timing generation circuit 35.
- the voltage is applied to each of the sustain electrodes SU1 to SUn.
- a sustain pulse of the voltage Vs is generated and applied to the sustain electrodes SU1 to SUn.
- timing detection pulses V2 and V4 of the voltage Vso are generated and applied to the sustain electrodes SU1 to SUn.
- the voltage Ve is applied to the sustain electrodes SU1 to SUn.
- Scan electrode drive circuit 33 includes a ramp waveform voltage generation circuit, a sustain pulse generation circuit, and a scan pulse generation circuit (not shown in FIG. 5), and each drive voltage waveform is based on a timing signal supplied from timing generation circuit 35. Is applied to each of scan electrodes SC1 to SCn. Based on the timing signal, the ramp waveform voltage generation circuit is configured to initialize each of the initialization periods Pie1, Pif2 to Pif8 of the subfields SF1 to SF8 as image display subfields, an initialization period Pigo of the timing detection subfield SFo, and a y coordinate detection subfield.
- a ramp waveform voltage for an initialization operation to be applied to scan electrodes SC1 to SCn is generated in initialization period Pify of SFy and initialization period Pihx of x-coordinate detection subfield SFx.
- sustain pulse generation circuit Based on the timing signal, sustain pulse generation circuit detects sustain pulses applied to scan electrodes SC1 to SCn in sustain periods Ps1 to Ps8 of image display subfields subfields SF1 to SF8, and timing detection of subfield SFo Timing detection pulses V1 and V3 of voltage Vso (equal to voltage Vs in the present embodiment) applied to scan electrodes SC1 to SCn in period Po are generated.
- the scan pulse generation circuit includes a plurality of scan electrode driving ICs (scan ICs), and based on the timing signal, the writing periods Pw1 to Pw8 of the subfields SF1 to SF8 that are image display subfields and the timing detection subfield Sfo
- a voltage Vc applied to scan electrodes SC1 to SCn and a scan pulse of voltage Va are generated.
- the scan pulse generation circuit generates the voltage Vc and the y coordinate detection pulse of the voltage Vay in the y coordinate detection period Py of the y coordinate detection subfield SFy, and in the x coordinate detection period Px of the x coordinate detection subfield SFx. Generates a voltage Vc and an x-coordinate detection voltage Vax.
- the light pen 50 is used when the user inputs characters, drawings and the like in the image display area of the panel 10 by handwriting.
- the light pen 50 is formed in a bar shape and includes a light receiving element 52, a timing detection circuit 54, a coordinate calculation circuit 56, and a transmission circuit 58.
- the light pen 50 has a contact switch.
- the contact switch is provided at the tip of the light pen 50 and detects the contact when the light pen 50 contacts the front substrate 11 of the panel 10 (the image display surface of the panel 10).
- the light receiving element 52 receives light emitted from the image display surface of the panel 10 and converts it into an electric signal (light receiving signal). Then, the light reception signal is output to the timing detection circuit 54 and the coordinate calculation circuit 56.
- the timing detection circuit 54, the coordinate calculation circuit 56, and the transmission circuit 58 have a period during which the contact switch detects contact (for example, a period during which the manual switch is turned on in a non-contact type light pen without a contact switch). The following operations are performed.
- the timing detection circuit 54 detects light emission for timing detection (light emission generated by the timing detection discharge) generated in the timing detection period Po of the timing detection subfield SFo based on the light reception signal. Specifically, the timing detection circuit 54 uses a timer (not shown in FIG. 7) included in the timing detection circuit 54 to measure a plurality of (for example, five times) light emission time intervals. Then, whether or not the time interval matches a predetermined time interval (for example, time To0, time To1, time To2, time To3) is determined by a plurality of threshold values (set in the timing detection circuit 54). For example, the determination is made by comparing the measured time interval with a threshold value corresponding to time To0, time To1, time To2, and time To3.
- a predetermined time interval for example, time To0, time To1, time To2, and time To3.
- the timing detection circuit 54 detects a plurality of light emissions generated at predetermined time intervals based on the light reception signal. In the example illustrated in FIG. 6, five consecutive light emission intervals of light emission intervals of time To0, time To1, time To2, and time To3 are detected.
- the timing detection circuit 54 generates a coordinate reference signal based on one of the continuous plural times (for example, five times) of light emission.
- the coordinate reference signal is created based on the light emission generated at time to1 in the timing detection period Po.
- the time to1 is the time when the first timing detection pulse V1 is applied to the scan electrodes SC1 to SCn in the timing detection period Po of the timing detection subfield SFo.
- the coordinate reference signal is not shown in FIG. 6, but is a signal having rising edges at time ty0 and time tx0, for example.
- Time ty0 is a time at which a y-coordinate detection pulse is applied to scan electrode SC1 in the first row in y-coordinate detection period Py of y-coordinate detection subfield SFy.
- Time tx0 is a time at which an x-coordinate detection pulse is applied to the data electrodes D1 to D3 corresponding to the first pixel column in the x-coordinate detection period Px of the x-coordinate detection subfield SFx.
- the timing detection circuit 54 detects a plurality of timing detection light emissions generated at predetermined time intervals in the timing detection period Po based on the light reception signal, and detects the time to1. Is identified. Then, a timer (not shown in FIG. 7) included in the timing detection circuit 54 is operated on the basis of the time to1, and a coordinate reference signal having rising edges at each of the time ty0 and the time tx0 is generated.
- the timing detection circuit 54 outputs the coordinate reference signal to the coordinate calculation circuit 56.
- the coordinate reference signal may be generated on the basis of the time to2 at which the second timing detection pulse V2 is generated, or the time to3 at which the third timing detection pulse V3 is generated or the fourth timing detection pulse V4. You may generate
- the coordinate reference signal is not limited to a signal having rising edges at time ty0 and time tx0.
- the coordinate reference signal may be any signal that can be used as a reference for specifying the time when the light receiving element 52 receives light emission by the y coordinate detection pattern and light emission by the x coordinate detection pattern.
- the coordinate calculation circuit 56 includes a counter that measures the length of time and an arithmetic circuit that performs an operation on the output of the counter (not shown in FIG. 7).
- the coordinate calculation circuit 56 selectively extracts a signal indicating the light emission of the y coordinate detection pattern and a signal indicating the light emission of the x coordinate detection pattern from the light reception signal, and writes the light in the image display area.
- the position (x coordinate, y coordinate) of the pen 50 is calculated.
- the coordinate calculation circuit 56 counts the time (time Tyy) from time ty0 to the time (time tyy) from which light is first received by the light receiving element 52 after time ty0 based on the coordinate reference signal. Measure with Then, the time Tyy is divided by the time Ty1 (pulse width of the y coordinate detection pulse) in the arithmetic circuit. In this way, the y coordinate of the position of the light pen 50 in the image display area is calculated.
- the coordinate calculation circuit 56 measures, based on the coordinate reference signal, a time (time Txx) from time tx0 to time (time txx) when light is first received by the light receiving element 52 after time tx0. To do. Then, the time Txx is divided by the time Tx1 (pulse width of the x coordinate detection pulse) in the arithmetic circuit. In this way, the x coordinate of the position of the light pen 50 in the image display area is calculated.
- the time tyy is the time when the light receiving element 52 of the light pen 50 receives light emitted from the panel 10 by the y coordinate detection pattern
- the time txx is the time when the light receiving element 52 of the light pen 50 receives the panel 10 by the x coordinate detection pattern. It is the time when the light emission generated in
- the coordinate calculation circuit 56 in the present embodiment calculates the position (coordinates (x, y)) of the light pen 50 in the image display area.
- the transmission circuit 58 has a transmission circuit that encodes an electrical signal and converts the encoded signal into a radio signal such as infrared rays and transmits the signal (not shown in FIG. 7). Then, a signal representing the position (coordinates (x, y)) of the light pen 50 calculated by the coordinate calculation circuit 56 is encoded, converted into a wireless signal, and wirelessly transmitted to the reception circuit 46.
- the reception circuit 46 includes a conversion circuit that receives a wireless signal wirelessly transmitted from the transmission circuit 58 of the light pen 50, decodes the received signal, and converts it into an electrical signal (not shown in FIG. 7).
- the wireless signal wirelessly transmitted from the transmission circuit 58 is converted into a signal representing the position (x coordinate, y coordinate) of the light pen 50 and output to the drawing circuit 44.
- the drawing circuit 44 includes an image memory (not shown in FIG. 7).
- the drawing circuit 44 generates a drawing signal for indicating the locus of the light pen 50 in the image display area of the panel 10 based on the signal received by the receiving circuit 46 (x coordinate and y coordinate calculated by the coordinate calculation circuit 56). To do.
- the drawing signal is stored in the image memory.
- a drawing signal obtained by adding the current position coordinates of the light pen 50 to the past locus of the light pen 50 is accumulated in the image memory.
- the drawing circuit 44 outputs the drawing signal stored in the image memory to the image signal processing circuit 31.
- the image signal processing circuit 31 synthesizes the drawing signal output from the drawing circuit 44 and the image signal, converts the image signal into image data, and outputs the image data to a subsequent circuit. In this way, the graphic input handwritten by the light pen 50 is combined with the image based on the image signal and displayed on the panel 10.
- the light pen 50 may be provided with a switch for switching between the “drawing” mode and the “erasing” mode.
- the trace of the light pen 50 shown on the panel 10 is traced with the light pen 50 again, so that the drawing signal accumulated in the image memory is partially or entirely. to erase.
- the light pen may be configured in this way.
- the light pen 50 is configured so that the light receiving element 52 converts the received light emission into a light reception signal and outputs it to a subsequent circuit only when the tip of the light pen 50 is in contact with the image display surface of the panel 10. It may be.
- FIG. 8 is a circuit diagram schematically showing a configuration example of the scan electrode drive circuit 33 of the plasma display device 100 according to the second embodiment of the present invention.
- the scan electrode drive circuit 33 includes a sustain pulse generation circuit 55, a ramp waveform voltage generation circuit 60, and a scan pulse generation circuit 70. Each circuit block operates based on the timing signal supplied from the timing generation circuit 35, but details of the path of the timing signal are omitted in FIG. Hereinafter, the voltage input to the scan pulse generation circuit 70 is referred to as “reference potential A”.
- Sustain pulse generation circuit 55 has power recovery circuit 51, switching element Q55, switching element Q56, and switching element Q59.
- the power recovery circuit 51 includes a power recovery capacitor C10, a switching element Q11, a switching element Q12, a backflow prevention diode Di11, a diode Di12, a resonance inductor L11, and an inductor L12.
- the power recovery circuit 51 recovers the power stored in the panel 10 from the panel 10 through LC resonance between the interelectrode capacitance of the panel 10 and the inductor L12, and stores it in the capacitor C10. Then, the recovered power is supplied to the panel 10 again from the capacitor C10 through LC resonance between the interelectrode capacitance of the panel 10 and the inductor L11, and reused as power when driving the scan electrodes SC1 to SCn.
- Switching element Q55 clamps scan electrodes SC1 to SCn to voltage Vs
- switching element Q56 clamps scan electrodes SC1 to SCn to voltage 0 (V).
- the switching element Q59 is a separation switch, and prevents a current from flowing back through a parasitic diode or the like of the switching element constituting the scan electrode driving circuit 33.
- Scan pulse generation circuit 70 sequentially applies scan pulses to scan electrodes SC1 to SCn at the timings shown in FIGS. Scan pulse generation circuit 70 outputs the output voltage of sustain pulse generation circuit 55 as it is during the sustain period. That is, the reference potential A is output to scan electrodes SC1 to SCn.
- a voltage Vc and an x-coordinate detection voltage Vax are generated and applied to the scan electrodes SC1 to SCn.
- the ramp waveform voltage generation circuit 60 includes a Miller integration circuit 61, a Miller integration circuit 62, and a Miller integration circuit 63, and generates the ramp waveform voltage shown in FIGS.
- the voltage Vt may be set so that a voltage obtained by superimposing the voltage Vp on the voltage Vt is equal to the voltage Vi2.
- switching element Q72 and switching elements Q71L1 to Q71Ln are turned off, switching elements Q71H1 to Q71Hn are turned on, and the rising ramp waveform voltage generated in Miller integrating circuit 61 is turned on.
- the up slope waveform voltage for the initialization operation can be generated by superimposing the voltage Vp of the power source E71 on the top.
- Miller integrating circuit 62 includes transistor Q62, capacitor C62, resistor R62, and diode Di62 for preventing backflow. Then, by applying a constant voltage to the input terminal IN62 (giving a constant voltage difference between two circles shown as the input terminal IN62), an up-slope waveform voltage that gradually rises toward the voltage Vr ( Ascending ramp waveform voltage generated in the thirteenth period Pi13 of the initialization period Pie1 of the subfield SF1, which is an image display subfield, and ascending ramp waveform voltage generated at the end of each sustain period Ps1 to Ps8 of the subfields SF1 to SF8, timing Ascending ramp waveform voltage generated at the end of the timing detection period Po of the detection subfield SFo is generated.
- Miller integrating circuit 63 includes transistor Q63, capacitor C63, and resistor R63. Then, by applying a constant voltage to the input terminal IN63 (giving a constant voltage difference between two circles illustrated as the input terminal IN63), a downward ramp waveform voltage (gradiently decreasing toward the voltage Va ( down-slope waveform voltage generated in the initialization period Pihx of the x-coordinate detection subfield SFx). Alternatively, by stopping the operation of Miller integrating circuit 63 when the voltage drops to voltage Vi4 or voltage Vi6, the falling ramp waveform voltage (image display subfield, which is an image display subfield) gradually decreases toward voltage Vi4 or voltage Vi6.
- the switching element Q69 is a separation switch, and prevents a current from flowing back through a parasitic diode or the like of the switching element constituting the scan electrode driving circuit 33.
- switching elements and transistors can be configured using generally known semiconductor elements such as MOSFETs and IGBTs. These switching elements and transistors are controlled by timing signals corresponding to the respective switching elements and transistors generated by the timing generation circuit 35.
- FIG. 9 is a circuit diagram schematically showing a configuration example of the sustain electrode driving circuit 34 of the plasma display device 100 according to the second embodiment of the present invention.
- the sustain electrode driving circuit 34 includes a sustain pulse generating circuit 80 and a constant voltage generating circuit 85. Each circuit block operates based on the timing signal supplied from the timing generation circuit 35, but details of the timing signal path are omitted in FIG.
- Sustain pulse generation circuit 80 has a power recovery circuit 81, a switching element Q83, and a switching element Q84.
- the power recovery circuit 81 includes a power recovery capacitor C20, a switching element Q21, a switching element Q22, a backflow prevention diode Di21, a diode Di22, a resonance inductor L21, and an inductor L22.
- the power recovery circuit 81 recovers the power stored in the panel 10 from the panel 10 through LC resonance between the interelectrode capacitance of the panel 10 and the inductor L22, and stores it in the capacitor C20. Then, the recovered power is supplied to the panel 10 again from the capacitor C20 by LC resonance between the interelectrode capacitance of the panel 10 and the inductor L21, and is reused as power when driving the sustain electrodes SU1 to SUn.
- Switching element Q83 clamps sustain electrodes SU1 to SUn to voltage Vs, and switching element Q84 clamps sustain electrodes SU1 to SUn to voltage 0 (V).
- sustain pulse generating circuit 80 generates a sustain pulse of voltage Vs applied to sustain electrodes SU1 to SUn.
- timing detection pulses V2 and V4 to be applied to the sustain electrodes SU1 to SUn are generated in the timing detection period Po of the timing detection subfield SFo.
- the constant voltage generation circuit 85 includes a switching element Q86 and a switching element Q87. Then, the constant voltage generation circuit 85 writes the initialization periods Pie1, Pif2 to Pif8 and the writing periods Pw1 to Pw8 of the subfields SF1 to SF8, which are image display subfields, and the initialization period Pigo of the timing detection subfield SFo. During the period Pwo, the initialization period Pfy and y coordinate detection period Py of the y coordinate detection subfield SFy, and the initialization period Pihx and x coordinate detection period Px of the x coordinate detection subfield SFx, the voltage Ve is applied to the sustain electrodes SU1 to SUn. Apply.
- these switching elements can be configured using generally known elements such as MOSFETs and IGBTs. These switching elements are controlled by timing signals corresponding to the respective switching elements generated by the timing generation circuit 35.
- FIG. 10 is a circuit diagram schematically showing a configuration example of the data electrode drive circuit 32 of the plasma display device 100 according to the second embodiment of the present invention.
- the data electrode drive circuit 32 operates based on the image data supplied from the image signal processing circuit 31 and the timing signal supplied from the timing generation circuit 35. In FIG. 10, details of the paths of these signals are omitted. To do.
- the data electrode drive circuit 32 includes switching elements Q91H1 to Q91Hm and switching elements Q91L1 to Q91Lm. Then, voltage 0 (V) is applied to data electrode Dj by turning on switching element Q91Lj, and voltage Vd is applied to data electrode Dj by turning on switching element Q91Hj. In this way, the data electrode drive circuit 32 outputs the write pulse of the voltage Vd in the write periods Pw1 to Pw8 of the subfields SF1 to SF8 that are image display subfields, and writes the voltage Vd in the write period Pwo of the timing detection subfield SFo.
- Vdy voltage Vd
- Vdx voltage Vd
- FIG. 11 is a diagram schematically showing an example of the operation when the position coordinates of the light pen 50 are detected in the plasma display system 30 according to the second embodiment of the present invention.
- FIG. 12 is a diagram schematically showing an example of a drive voltage waveform when the position coordinates of the light pen 50 are detected in the plasma display system 30 according to the second embodiment of the present invention.
- FIG. 12 shows scan electrode SC1, scan electrode SCn, data electrode D1, data in timing detection subfield SFo, y-coordinate detection subfield SFy, and x-coordinate detection subfield SFx following subfield SF8 which is an image display subfield.
- a driving voltage waveform applied to each of the electrodes Dm, a coordinate reference signal input to the coordinate calculation circuit 56, and a light reception signal output from the light receiving element 52 are shown.
- the drive voltage waveforms applied to sustain electrodes SU1 to SUn are omitted, but the drive voltage waveforms shown in FIG. 13 are the same as the drive voltage waveforms shown in FIGS.
- time Toy from time to1 to time ty0 is determined in advance, and time Tox from time to1 to time tx0 is determined in advance.
- the timing detection circuit 54 can identify the time to1, as shown in FIG. 12, the timing detection circuit 54 generates a coordinate reference signal having rising edges at each of the time ty0 and the time tx0 and outputs the coordinate reference signal to the coordinate calculation circuit 56. it can.
- the timing detection circuit 54 emits light of five consecutive times in which the intervals of light emission are time To0, time To1, time To2, and time To3 (output from the light receiving element 52 based on these light emission). Is detected by detecting the received light signal).
- a y-coordinate detection pattern in which linear light emission extended in the first direction (row direction) sequentially moves in the second direction (column direction) is displayed on the panel 10.
- a y-coordinate detection pattern in which linear light emission extended in the first direction (row direction) sequentially moves in the second direction (column direction) is displayed on the panel 10.
- one horizontal line Ly that sequentially moves from the upper end (first row) to the lower end (nth row) of the image display region is displayed in the image display region of the panel 10. Is done.
- the light pen 50 receives light at the time tyy when the horizontal line Ly passes the coordinates (x, y).
- the element 52 receives the light emission of the horizontal line Ly.
- the light pen 50 outputs a light reception signal indicating that the light receiving element 52 has received the light emission of the horizontal line Ly at the time tyy.
- an x-coordinate detection pattern in which linear light emission extended in the second direction (column direction) sequentially moves in the first direction (row direction) is displayed on the panel. 10 is displayed. Accordingly, as shown in FIG. 11, the image display area of the panel 10 is sequentially moved from the left end portion (first pixel column) to the right end portion (m / 3 pixel row) of the image display area.
- One vertical line Lx is displayed.
- the light pen 50 If the tip of the light pen 50 is in contact with the “coordinates (x, y)” of the image display surface of the panel 10, the light pen 50 will be at the time txx when the vertical line Lx passes the coordinates (x, y).
- the light receiving element 52 receives light emitted from the vertical line Lx. Thereby, as shown in FIG. 12, the light pen 50 outputs a light reception signal indicating that the light receiving element 52 has received the light emission of the vertical line Lx at time txx.
- the coordinate calculation circuit 56 shown in FIG. 7 is based on the coordinate reference signal output from the timing detection circuit 54 and the light reception signal output from the light receiving element 52 in the y coordinate detection period Py of the y coordinate detection subfield SFy.
- the time Tyy from the time ty0 to the time tyy is measured using the counter provided for.
- the time Tyy is divided by the time Ty1 in the arithmetic circuit provided inside. The division result is the y coordinate of the position of the light pen 50 in the image display area.
- the coordinate calculation circuit 56 is provided internally based on the coordinate reference signal output from the timing detection circuit 54 and the light reception signal output from the light receiving element 52 in the x coordinate detection period Px of the x coordinate detection subfield SFx.
- a time Txx from time tx0 to time txx is measured using a counter. Then, the time Txx is divided by the time Tx1 in the arithmetic circuit provided inside. This division result is the x coordinate of the position of the light pen 50 in the image display area.
- the coordinate calculation circuit 56 in the present embodiment calculates the position (coordinates (x, y)) of the light pen 50 in the image display area.
- FIG. 13 is a diagram schematically showing an example of an operation when performing handwriting input with the light pen 50 in the plasma display system 30 according to the second embodiment of the present invention.
- the drawing circuit 44 outputs a drawing signal of a drawing pattern of a predetermined color and size (for example, a pattern such as a black circle) around the pixel corresponding to the coordinates (x, y) calculated by the coordinate calculation circuit 56. Write to memory.
- a drawing signal of a drawing pattern of a predetermined color and size for example, a pattern such as a black circle
- the coordinates (x, y) calculated by the coordinate calculation circuit 56 also correspond to the movement of the light pen 50. Change.
- the drawing circuit 44 sequentially writes a drawing signal corresponding to the drawing pattern whose position has changed in the image memory while changing the position of the drawing pattern according to the changing coordinates (x, y).
- the drawing signal indicating the locus of the light pen 50 is accumulated in the image memory of the drawing circuit 44.
- the drawing signal stored in the image memory is read for each field and output to the image signal processing circuit 31.
- the mode of the light pen 50 is switched from “draw” to “erase” and the locus of the light pen 50 shown on the panel 10 is traced again.
- the drawing signal stored in the image memory may be partially or entirely erased.
- the image signal processing circuit 31 combines the drawing signal output from the drawing circuit 44 and the image signal, and generates image data based on the combined signal.
- the panel 10 displays an image in which an image indicating the locus of the light pen 50 (a graphic input by handwriting using the light pen 50) is superimposed on the image signal.
- the image display system (for example, the plasma display system 30) according to the present embodiment generates a highly accurate timing detection discharge in which the timing variation at the time of occurrence of the discharge is reduced in the timing detection subfield SFo. It becomes possible to do. Further, in the y coordinate detection subfield SFy and the x coordinate detection subfield SFx, it is possible to display on the panel 10 a highly accurate y coordinate detection pattern and x coordinate detection pattern in which variations in timing at the time of occurrence of discharge are reduced. Become.
- the light pen 50 can calculate the position coordinates (x coordinate, y coordinate) with higher accuracy. Therefore, in the plasma display system 30 in the present embodiment, the locus of the light pen 50 can be drawn based on accurate position coordinates.
- timing detection discharge is generated four times at predetermined time intervals (for example, time To1, time To2, and time To3) in the timing detection subfield SFo.
- the number of timing detection discharges may be two or more.
- the time intervals (for example, time To1, time To2, and time To3) when the timing detection discharge is generated a plurality of times (for example, four times) in the timing detection subfield SFo are set to different times.
- time intervals may be equal to each other.
- the pulse widths of the timing detection pulses V1, V2, V3, and V4 are, for example, 40 ⁇ sec, 20 ⁇ sec, 30 ⁇ sec, and 15 ⁇ sec in this order.
- the timing detection pulses V1, V2, V3, and V4 are set to different pulse widths.
- the time intervals of the timing detection discharge generated by the timing detection pulse are set to different time intervals.
- the pulse widths of the timing detection pulses V1, V2, V3, and V4 are not limited to the numerical values described above. Each pulse width may be set optimally according to the specifications of the plasma display device.
- the pulse widths of the timing detection pulses are set to be equal to each other, a blanking period (a period in which the applied voltage is maintained at voltage 0 (V)) is provided immediately after the pulse is generated, and the blanking periods are set to different times
- the time intervals of the timing detection discharge generated by the timing detection pulse may be different from each other.
- the configuration in which the timing detection subfield SFo, the y coordinate detection subfield SFy, and the x coordinate detection subfield SFx are provided in each field has been described, but the present invention is not limited to this configuration.
- the configuration may be such that those subfields are generated at a rate of once in a plurality of fields.
- the timing detection subfield SFo is provided in each field, and wireless communication is performed between the plasma display device and the light pen.
- the drive voltage waveform shown in the first embodiment is shown in FIG.
- a timing detection subfield SFo may be added.
- FIG. 14 schematically shows another example of the drive voltage waveform applied to each electrode of panel 10 in timing detection subfield SFo, y coordinate detection subfield SFy, and x coordinate detection subfield SFx in the second embodiment of the present invention.
- FIG. 14 schematically shows another example of the drive voltage waveform applied to each electrode of panel 10 in timing detection subfield SFo, y coordinate detection subfield SFy, and x coordinate detection subfield SFx in the second embodiment of the present invention.
- FIG. 14 is a diagram in which a timing detection subfield SFo is provided in the drive voltage waveform shown in FIG. 4 in the first embodiment. Even with such a drive voltage waveform, each discharge is generated with high accuracy, and the position coordinates (x coordinate, y coordinate) can be calculated with higher accuracy in the light pen 50.
- the present invention is not limited to this configuration.
- a light reception signal output from the light receiving element can be immediately transmitted to the plasma display device via the electric cable. Is possible.
- the coordinate reference signal is generated inside the plasma display device (for example, the timing generation circuit), the timing detection circuit 54 shown in FIG. It can also be provided in a display device.
- the y-coordinate detection subfield SFy and the x-coordinate detection subfield SFx can be generated without generating the timing detection subfield SFo.
- the timing detection subfield SFo, the y coordinate detection subfield SFy, and the x coordinate detection subfield SFx are generated in this order.
- the generation order of the subfields is not limited to this order.
- the y coordinate detection subfield SFy may be generated after the x coordinate detection subfield SFx.
- an image display subfield may be generated after the y coordinate detection subfield SFy and the x coordinate detection subfield SFx.
- the timing detection subfield SFo may be generated between the y coordinate detection subfield SFy and the x coordinate detection subfield SFx, and the timing detection subfield SFo is generated after the x coordinate detection subfield SFx. May be.
- the initialization period Picx ( Alternatively, a period Tx0 for reducing priming particles generated in Pihx) is provided. If the priming particles are reduced, dark current can be suppressed, so that reduction in wall charges can be suppressed. Thereby, compared with the case where the period Tx0 is not provided, it is possible to suppress a decrease in wall charges in the x coordinate detection period Px of the x coordinate detection subfield SFx.
- the period Tx0 is set to 200 ⁇ sec or more. Further, it is desirable to set the upper limit of the period Tx0 within a range in which priming particles are not excessively reduced and all the subfields are contained in one field. In the present embodiment, the period Tx0 is set to 1 msec or less.
- the x coordinate detection subfield SFx is generated after the y coordinate detection subfield SFy.
- the priming particles generated in the sustain period Ps8 of the subfield SF8 decrease during the y coordinate detection subfield SFy.
- the dark current flowing according to the residual amount of priming particles can be suppressed, so that the reduction of wall charges in the x coordinate detection period Px can be suppressed.
- the dark current flowing according to the residual amount of priming particles can be suppressed, so that subsequent reduction of wall charges can be suppressed.
- each operation has been described by taking a plasma display device using a plasma display panel as an image display unit as an example of the image display device.
- the image display device is not limited to the plasma display device.
- the same effects as those described above can be obtained by applying the same configuration as that described above.
- the y coordinate detection pattern In the embodiment of the present invention, as the y coordinate detection pattern, one horizontal line that emits light (one pixel row that emits light) extends from the upper end portion (first row) to the lower end portion (first row) of the image display area of the panel 10. A pattern of sequentially moving one line at a time up to the nth line) is shown.
- the y coordinate detection pattern is not limited to this pattern.
- a plurality of horizontal lines that emit light are arranged in multiple lines from the upper end (first line) to the lower end (nth line) of the image display area of the panel 10. It may be a pattern that moves sequentially.
- one horizontal line that emits light is every other line from the upper end (first row) to the lower end (nth row) of the image display area of the panel 10.
- the pattern may move sequentially.
- the time required for the y-coordinate detection subfield SFy can be shortened compared to the configuration shown in the present embodiment.
- the x coordinate detection pattern In the embodiment of the present invention, as the x coordinate detection pattern, one vertical line that emits light (one pixel column that emits light) is the left end (first pixel column) of the image display area of the panel 10. A pattern is shown that sequentially moves one column at a time from the right end to the right end (m / 3th pixel column).
- the x coordinate detection pattern is not limited to this pattern.
- a plurality of light emitting vertical lines are arranged from the left end (first pixel column) to the right end (m / 3 column) of the image display area of the panel 10.
- the x-coordinate detection pattern it may be a pattern in which a plurality of columns are sequentially moved to the first pixel column).
- one vertical line that emits light one pixel column that emits light
- the time required for the x-coordinate detection subfield SFx can be shortened as compared with the configuration shown in the present embodiment.
- one field has a plurality of image display subfields and a subfield for detecting position coordinates.
- the present invention is not limited to this configuration. is not.
- one field may be composed of only a plurality of image display subfields.
- the forced initializing operation has been described as an initializing operation that forcibly generates initializing discharge in all the discharge cells in the image display area of the panel. It is not limited to this configuration.
- the forced initializing waveform is applied only to some discharge cells in the image display area of the panel and the initializing discharge is forcibly generated only in the discharge cells. It shall be included in the conversion operation.
- a configuration in which the drawing circuit 44 is provided in the plasma display device is shown, but the present invention is not limited to this configuration.
- a computer connected to the plasma display device may have a function corresponding to the drawing circuit 44, and a drawing signal may be generated using the computer.
- the drive voltage waveforms shown in FIGS. 3, 4, 5, 6, 12, and 14 are merely examples in the embodiment of the present invention, and the present invention is not limited to these drive voltage waveforms. It is not limited to.
- circuit configurations shown in FIGS. 7, 8, 9, and 10 are merely examples in the embodiment of the present invention, and the present invention is not limited to these circuit configurations. .
- Each circuit block shown in the embodiment of the present invention may be configured as an electric circuit that performs each operation shown in the embodiment, or substantially the same as each operation shown in the embodiment.
- a microcomputer or a computer programmed to operate may be used.
- the specific numerical values shown in the embodiment of the present invention are set based on the characteristics of the panel 10 having a screen size of 50 inches and the number of display electrode pairs 14 of 1024. It is just an example.
- the present invention is not limited to these numerical values, and each numerical value is desirably set optimally in accordance with panel specifications, panel characteristics, plasma display device specifications, and the like. Each of these numerical values is allowed to vary within a range where the above-described effect can be obtained.
- the present invention can stably generate a discharge for detecting the position coordinates of the light pen and accurately detect the position coordinates of the light pen, the driving method of the image display apparatus, the image display apparatus, and the image display Useful as a system.
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Abstract
Selon l'invention, afin de détecter avec précision les coordonnées de position d'un photostyle, chaque champ, dans un procédé d'attaque d'un dispositif d'affichage d'image, est pourvu : d'une pluralité de sous-champs d'affichage d'image ; d'un sous-champ de détection de coordonnées y et d'un sous-champ de détection de coordonnées x. Dans la période d'initialisation d'au moins un sous-champ d'affichage d'image et la période d'initialisation du sous-champ de détection de coordonnées x, des tensions de forme d'onde inclinées vers le bas sont appliquées à une électrode de balayage, et des tensions sont également appliquées à une électrode de maintenance et une électrode de données, de telle sorte que la tension entre l'électrode de maintenance et l'électrode de balayage n'excède pas une tension de démarrage de décharge et la tension entre l'électrode de données et l'électrode de balayage excède la tension de démarrage de décharge. En outre, le potentiel atteint par la tension inclinée vers le bas qui est appliquée à l'électrode de balayage dans la période d'initialisation du sous-champ de détection de coordonnées x est réglé à une valeur de tension qui est inférieure au potentiel obtenu par la tension inclinée vers le bas qui est appliquée à l'électrode de balayage dans la période d'initialisation du sous-champ d'affichage d'image.
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JP2012030263A JP2015084009A (ja) | 2012-02-15 | 2012-02-15 | プラズマディスプレイパネルの駆動方法、プラズマディスプレイ装置およびプラズマディスプレイシステム |
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JPH01234291A (ja) * | 1988-03-14 | 1989-09-19 | Kanzaki Paper Mfg Co Ltd | 感熱記録体 |
JP2001318765A (ja) * | 2000-05-10 | 2001-11-16 | Nec Corp | プラズマディスプレイパネルの座標位置検出装置および座標位置検出方法 |
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JPH01234291A (ja) * | 1988-03-14 | 1989-09-19 | Kanzaki Paper Mfg Co Ltd | 感熱記録体 |
JP2001318765A (ja) * | 2000-05-10 | 2001-11-16 | Nec Corp | プラズマディスプレイパネルの座標位置検出装置および座標位置検出方法 |
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