WO2013161144A1 - Système d'affichage d'image, procédé d'entraînement de système d'affichage d'image et pointeur optique - Google Patents

Système d'affichage d'image, procédé d'entraînement de système d'affichage d'image et pointeur optique Download PDF

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Publication number
WO2013161144A1
WO2013161144A1 PCT/JP2013/000863 JP2013000863W WO2013161144A1 WO 2013161144 A1 WO2013161144 A1 WO 2013161144A1 JP 2013000863 W JP2013000863 W JP 2013000863W WO 2013161144 A1 WO2013161144 A1 WO 2013161144A1
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WIPO (PCT)
Prior art keywords
light
voltage
image display
signal
subfield
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PCT/JP2013/000863
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English (en)
Japanese (ja)
Inventor
剛 桑山
井上 真一
貴彦 折口
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パナソニック株式会社
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Priority claimed from JP2012102202A external-priority patent/JP2015132860A/ja
Priority claimed from JP2012102203A external-priority patent/JP2015132861A/ja
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2013161144A1 publication Critical patent/WO2013161144A1/fr

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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/037Pointing 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
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354Pointing 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
    • G06F3/03542Light pens for emitting or receiving light
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G06F3/0386Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry for light pen

Definitions

  • the present invention relates to an image display system driving method for displaying 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, and a light pen, and an image display using the light pen
  • the present invention relates to an image display system capable of handwritten input of characters and drawings on an apparatus.
  • 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.
  • the image display system includes an image display device including an image display unit including a plurality of scan electrodes, sustain electrodes, and a plurality of data electrodes, and a light pen including a light receiving element and a light reception state display unit.
  • the image display device generates a timing detection subfield, a y coordinate detection subfield, and an x coordinate detection subfield.
  • the light pen receives light emitted from the image display unit in the timing detection subfield, the y coordinate detection subfield, and the x coordinate detection subfield to generate a light reception signal, and a light reception signal and a preset light reception signal threshold value.
  • To determine the current light reception state and outputs a signal including a light reception state signal indicating the result of the determination.
  • the image display device displays an image based on the light reception state signal output from the light pen 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 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 exemplary embodiment of the present invention.
  • FIG. 3 is a diagram schematically showing an example of a drive voltage waveform applied to each electrode of the panel in the subfields SF1 to SF3 of the image display subfield in the embodiment of the present invention.
  • FIG. 4 is a diagram schematically showing an example of a 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 embodiment of the present invention.
  • FIG. 5 is a diagram schematically showing an example of a circuit block and a plasma display system constituting the plasma display device in the embodiment of the present invention.
  • FIG. 6 is a diagram showing an example of a light pen icon displayed on the plasma display device according to the embodiment of the present invention.
  • FIG. 7 is a circuit diagram schematically showing a configuration example of a scan electrode driving circuit of the plasma display device in accordance with the exemplary embodiment of the present invention.
  • FIG. 8 is a circuit diagram schematically showing a configuration example of the sustain electrode driving circuit of the plasma display device in accordance with the exemplary embodiment of the present invention.
  • FIG. 9 is a circuit diagram schematically showing a configuration example of the data electrode driving circuit of the plasma display device in accordance with the exemplary embodiment of the present invention.
  • FIG. 5 is a diagram schematically showing an example of a circuit block and a plasma display system constituting the plasma display device in the embodiment of the present invention.
  • FIG. 6 is a diagram showing an example of a light pen icon displayed on the
  • FIG. 10 is a diagram schematically showing an example of the operation when detecting the position coordinates of the light pen in the plasma display system according to the embodiment of the present invention.
  • FIG. 11 is a diagram schematically showing an example of a driving voltage waveform when the position coordinates of the light pen are detected in the plasma display system according to the embodiment of the present invention.
  • FIG. 12A is a diagram schematically showing an example of an operation when performing handwriting input with a light pen in the plasma display system in accordance with the exemplary embodiment of the present invention.
  • FIG. 12B is a diagram schematically illustrating another example of the operation when performing handwriting input with a light pen in the plasma display system according to the exemplary 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 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 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 timing detection subfield SFo, 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.
  • an initializing discharge is generated in each discharge cell, wall charges necessary for the subsequent address operation are formed in the discharge cell, and priming particles (charged particles that assist the generation of the discharge) necessary for the address operation are formed. It occurs in the discharge cell.
  • 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 x-coordinate detection subfield SFx and the y-coordinate detection subfield SFy are subfields for detecting the x-coordinate and y-coordinate of the position (position coordinate) of the light pen in the image display area.
  • 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.
  • wireless communication is performed between the light pen and the drawing apparatus.
  • 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 drawing apparatus by wireless communication.
  • 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.
  • a plurality of image display subfields for example, subfields SF1 to SF8
  • a timing detection subfield SFo for example, a y coordinate detection subfield SFy
  • an x coordinate detection subfield SFx are arranged in this order.
  • An example in which each subfield occurs will be described, but the generation order of each subfield is not limited to this order.
  • the timing detection subfield SFo, the y coordinate detection subfield SFy, and the 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. 3 schematically shows an example of a drive voltage waveform applied to each electrode of panel 10 in subfields SF1 to SF3 of the image display subfield in the embodiment 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.
  • 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. Apply.
  • 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 subsequent 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. Although an example in which the voltage Vi3 is about 200 (V) is shown in this embodiment, the voltage Vi3 may be a voltage that does not cause discharge in the discharge cells. Further, the voltage may be sharply decreased from the voltage Vi2 to the voltage 0 (V).
  • a voltage 0 (V) is applied to the data electrodes D1 to Dm, and a positive voltage Ve is applied to the sustain electrodes SU1 to SUn.
  • the scan electrodes SC1 to SCn have a ramp waveform voltage that gradually falls from a voltage that is less than the discharge start voltage (eg, voltage 0 (V)) to a negative voltage Vi4 (hereinafter also simply referred to as “down ramp waveform voltage”). 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 above-mentioned drive voltage waveform generated in the initialization period Pi1 is a forced initialization waveform.
  • the wall voltage of each discharge cell in which the initializing discharge has occurred can be made substantially uniform.
  • the initializing discharge generated by the ramp waveform voltage is weaker than the sustaining discharge, and the light emission due to the initializing discharge has lower brightness than the light emission due to the sustaining discharge. This is to prevent the light emission by the initialization discharge from hindering the display of an image on the panel 10.
  • 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.
  • voltage 0 (V) is applied to data electrodes D1 to Dm
  • voltage Ve is applied to sustain electrodes SU1 to SUn
  • voltage Vc is applied to 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 voltages of the scan pulse and the address pulse are adjusted so that the address discharge is weaker than the sustain discharge. Therefore, the light emission due to the address discharge has lower luminance than the light emission due to the sustain discharge. This is to prevent light emission due to the address discharge from hindering display of an image on the panel 10.
  • 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.
  • 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 sustain discharge is a strong discharge and has a high luminance as compared with the initialization discharge and the address discharge.
  • voltage 0 (V) is applied to sustain electrodes SU1 to SUn and data electrodes D1 to Dm, and applied to scan electrodes SC1 to SCn.
  • An upward ramp waveform voltage that gradually rises from the voltage 0 (V) to the positive voltage Vr is applied.
  • the voltage Vr is set to a voltage exceeding the discharge start voltage of the discharge cell that has generated the sustain discharge. As a result, a weak discharge (erase discharge) is generated in the discharge cell that has generated the sustain discharge.
  • the selective initialization subfield will be described by taking the subfield SF2 as an example.
  • the same drive voltage waveform as that in the initialization period Pi2 of the subfield SF2 is applied to each electrode to perform the selective initialization operation. .
  • 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 drops from a voltage that is lower than the discharge start voltage (for example, voltage 0 (V)) to a negative voltage Vi4 is applied to scan electrodes SC1 to SCn.
  • This downward ramp waveform voltage has substantially the same waveform shape as the downward ramp waveform voltage generated in the initialization period Pi1.
  • This initialization discharge weakens the wall voltage on scan electrode SCi and the wall voltage on sustain electrode SUi.
  • 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.
  • the initialization discharge does not occur, and the wall voltage at the end of the initialization period Pi1 of the subfield SF1 is maintained.
  • 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 Pi2 is a selective 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 30, and the like.
  • the drive voltage waveforms similar to those in the address period Pw1 and the sustain period Ps1 in the subfield SF1 are applied to the respective electrodes, except for the number of sustain pulses generated, and thus the description thereof is omitted.
  • each subfield after subfield SF3 the drive voltage waveform similar to that in subfield SF2 is applied to each electrode except for the number of sustain pulses, and the description thereof is omitted.
  • 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.
  • the coordinate detection subfield is a generic name for the timing detection subfield SFo, the y coordinate detection subfield SFy, and the x coordinate detection subfield SFx.
  • FIG. 4 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 embodiment of the present invention. It is.
  • FIG. 4 in the timing detection subfield SFo, the y coordinate detection subfield SFy, and the x coordinate detection subfield SFx, the sustain electrodes SU1 to SUn, the scan electrode SC1, the scan electrode SCn, and the data electrodes D1 to Dm are applied.
  • a drive voltage waveform is shown.
  • FIG. 4 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 Pio, an address period Pwo, and a timing detection period Po.
  • the same driving voltage waveform as that in the initialization period Pi1 of the subfield SF1 of the image display subfield is applied to each electrode to perform the same forced initialization operation, and thus the description thereof is omitted.
  • 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.
  • the scan pulse is sequentially applied to each of the electrodes from the scan electrode SC1 to the scan electrode SCn while applying the write pulse to all the data electrodes D1 to Dm. It is also possible to apply a scan pulse to all the scan electrodes SC1 to SCn at a time and generate an address discharge in all the discharge cells in the image display area of the panel 10 at the same time.
  • 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). 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.
  • the time To0 is set to a time longer than any of the time To1, the time To2, and the time To3 described later.
  • 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).
  • this timing detection discharge is a strong discharge as compared with the address discharge, and the emission luminance is also high, like the sustain discharge.
  • 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 and creates a coordinate reference signal (a signal that becomes a reference when calculating the position coordinates (x coordinate, y coordinate) of the light pen).
  • the entire surface of the image display surface of the panel 10 shines at the same timing, so that the light pen is at the same timing no matter where the 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 generates a coordinate reference signal when it detects a plurality of times (for example, four times) of light emission occurring at a predetermined time interval (for example, time To1, time To2, and time To3).
  • timing detection period Po of the timing detection subfield SFo after the generation of the timing detection pulse V4 (the end of the timing detection period Po), an erase operation similar to the erase operation performed at the end of the sustain period Ps1 of the subfield SF1 is performed. . 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 y coordinate detection subfield SFy has an initialization period Piy and a y coordinate detection period Py.
  • a drive voltage waveform similar to that in the initialization period Pi2 of the subfield SF2 of the image display subfield is applied to each electrode to perform the same selective initialization operation, and thus description thereof is omitted.
  • timing detection discharges are generated in all the discharge cells in the image display area of the panel 10, and therefore in the initialization period Piy A weak initializing discharge is generated in all discharge cells.
  • the wall voltage of all the discharge cells in the image display area of the panel 10 is adjusted to the wall voltage suitable for the y coordinate detection pattern display operation in the subsequent y coordinate detection period Py.
  • 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.
  • y coordinate detection voltage Vdy is a voltage higher than the voltage 0 (V)
  • 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.
  • This discharge like the address discharge, is weaker than the sustain discharge and has a low emission luminance.
  • 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.
  • light emission for y coordinate detection occurs in the second pixel row (second discharge cell 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.
  • each pixel row from the first row to the n-th row of the image display region emits light sequentially for each row, so that the 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 the light reception timing when the light emission is received by the light pen.
  • 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.
  • This Ty1 is, for example, about 1 ⁇ sec.
  • the subsequent x coordinate detection subfield SFx has an initialization period Pix and an x coordinate detection period Px.
  • a driving voltage waveform similar to that in the initialization period Pi1 of the subfield SF1 of the image display subfield is applied to each electrode to perform the same forced initialization operation, and thus description thereof is omitted.
  • initialization discharge is generated in all the discharge cells in the image display area of the panel 10.
  • the wall voltage of all the discharge cells in the image display area of the panel 10 is adjusted to the wall voltage suitable for the x coordinate detection pattern display operation in the subsequent x coordinate detection period Px.
  • priming particles that assist the generation of discharge in the x-coordinate detection period Px 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 scan electrodes SC1 to SCn are applied.
  • a voltage Vc is applied to SCn.
  • the negative x coordinate detection voltage Vax is applied to the scan electrodes SC1 to SCn, and the positive x coordinate of the voltage Vdx is applied to the data electrodes D1 to D3 in the first to third columns.
  • Apply detection pulse 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. .
  • This discharge like the address discharge, is weaker than the sustain discharge and has a low emission luminance.
  • 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.
  • light emission for x coordinate detection occurs in the second pixel column (fourth, fifth, and sixth discharge cell columns).
  • Similar operations are performed adjacent to each other 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 scan electrodes SC1 to SCn.
  • Each of the three data electrodes 22 is sequentially performed until reaching the m-th discharge cell, and light emission for x coordinate detection is performed on each pixel column from the third column to the last column (for example, 1920 column). Generate sequentially.
  • 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.
  • 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 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.
  • 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.
  • This Tx1 is about 1 ⁇ sec, for example.
  • the above is the outline of the drive voltage waveforms of the timing detection subfield SFo, the y coordinate detection subfield SFy, and the x coordinate detection subfield SFx.
  • voltage Vc ⁇ 50 (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 Pi1 of the subfield SF1 the voltage Vi2 of the rising ramp waveform voltage generated in the initialization period Pio of the timing detection subfield SFo
  • the voltage Vi2 of the rising ramp waveform voltage generated in the initialization period Pix of the x-coordinate detection subfield SFx is the same voltage, but each voltage Vi2 may be set to a different voltage.
  • the gradient of the rising ramp waveform voltage generated in the initialization period Pi1 of the subfield SF1, the initialization period Pio of the timing detection subfield SFo, and the initialization period Pix of the x coordinate detection subfield SFx is about 1.5 (V / ⁇ sec).
  • the gradient of the downward ramp waveform voltage generated in the initialization period Pix of the field 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 timing detection period Po of the timing detection subfield SFo 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 reason why the timing detection subfield SFo is provided in one field and each drive voltage waveform of the timing detection subfield SFo is generated with the waveform shape shown in FIG. 4 is as follows.
  • the light pen itself can generate a coordinate reference signal (a signal indicating the generation timing of the y-coordinate detection period Py and the x-coordinate detection period Px), and the timing detection subfield in one field.
  • SFo is provided.
  • 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 with the waveform shape shown in FIG. 4, and the time To0 is set to the time To1.
  • 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 also detects light emission generated by 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 image display device detects the position (positional coordinates) 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. Discharge can be generated stably, and the position coordinates of the light pen can be calculated with high accuracy.
  • FIG. 5 is a diagram schematically showing an example of a circuit block and a plasma display system 100 that constitute the plasma display device 30 according to the embodiment of the present invention.
  • the plasma display system 100 shown in the present embodiment includes a plasma display device 30, a drawing device 40, and a plurality of light pens 50a, 50b, 50c, and 50d as constituent elements.
  • the light pens 50a, 50b, 50c, and 50d have the same configuration, they are also referred to as the light pen 50 in the following description. Further, the number of light pens 50 included in the plasma display system is not limited to four, and may be five or more, three or less, or one.
  • the plasma display device 30 includes a panel 10 and a driving circuit that drives the panel 10 with a plurality of subfields in one field.
  • the drive circuit includes an image signal processing circuit 31, a data electrode drive circuit 32, a scan electrode drive circuit 33, a sustain electrode drive circuit 34, a timing generation circuit 35, and a power supply circuit (not shown) that supplies power necessary for each circuit block. ).
  • the image signal processing circuit 31 receives an image signal, a drawing signal output from the drawing device 40, and a timing signal supplied from the timing generation circuit 35.
  • the image signal processing circuit 31 synthesizes the image signal and the drawing signal in order to display an image obtained by synthesizing the image signal and the drawing signal output from the drawing device 40 on the panel 10.
  • each gradation value (gradation value expressed by one field) of red, green, and blue is set in each discharge cell.
  • the image signal processing circuit 31 switches the image signal and the drawing signal output from the drawing device 40 and displays them on the panel 10 so that the red color is applied to each discharge cell based on either the image signal or the drawing signal.
  • 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 driving 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 driving circuit 32 performs the writing periods Pw1 to Pw1 of the subfields SF1 to SF8 which are image display subfields.
  • the writing pulse of the voltage Vd is used
  • the y coordinate detection period Py of the y coordinate detection subfield SFy the y coordinate detection voltage Vdy is used
  • the x coordinate detection subfield SFx the x coordinate detection period.
  • an x-coordinate detection pulse of voltage Vdx is applied to each data electrode 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.
  • the sustain pulse of the voltage Vs is used in the sustain periods Ps1 to Ps8 of the subfields SF1 to SF8, which are image display subfields.
  • the voltage Vso (equal to the voltage Vs in the present embodiment).
  • timing detection pulses V2 and V4 the initialization periods Pi1 to Pi8 and the writing periods Pw1 to Pw8 of the subfields SF1 to SF8, which are image display subfields, and the initialization period Pio and the writing period of the timing detection subfield SFo.
  • the voltage Ve is applied to the sustain electrodes SU1 to SUn in the initialization period Piy and the y coordinate detection period Py of the Pwo, y coordinate detection subfield SFy, and in the initialization period Pix and the x coordinate detection period Px of the x coordinate detection subfield SFx. To do.
  • 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.
  • the ramp waveform voltage generation circuit based on the timing signal, initializes Pi1 to Pi8 and sustain periods Pw1 to Pw8 of subfields SF1 to SF8, which are image display subfields, and initializes Pio of timing detection subfield SFo.
  • a ramp waveform voltage is applied to the scan electrodes SC1 to SCn.
  • the sustain pulse generating circuit Based on the timing signal, the sustain pulse generating circuit generates sustain pulses in the sustain periods Ps1 to Ps8 of the subfields SF1 to SF8 that are image display subfields, and the voltage Vso (this implementation) in the timing detection period Po of the timing detection subfield SFo.
  • timing detection pulses V1 and V3 equal to the voltage Vs
  • 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
  • scanning pulses of the voltage Vc and the voltage Va are used, in the y coordinate detection period Py of the y coordinate detection subfield SFy, the y coordinate detection pulse of the voltage Vc and voltage Vay is used, and the x coordinate detection period of the x coordinate detection subfield SFx.
  • voltage Vc and x-coordinate detection voltage Vax are applied to scan electrodes SC1 to SCn.
  • 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 rod shape and includes a light receiving element 52, a contact switch 53, a timing detection unit 54, a coordinate calculation unit 56, a light reception state display unit 57, and a transmission unit 59.
  • the light receiving state display unit 57 includes a light emitting unit 58.
  • the contact switch 53 is provided at the tip of the light pen 50 and detects whether or not the tip of the light pen 50 has contacted the front substrate 11 of the panel 10 (the image display surface of the panel 10).
  • the light pen 50 is provided with a manual switch (not shown), and the user can use the manual switch to draw a drawing mode S0 (for example, line color, line thickness, line type, etc. used for drawing). ) Can be switched arbitrarily.
  • a drawing mode S0 for example, line color, line thickness, line type, etc. used for drawing.
  • 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). This light reception signal changes according to the amount of received light emission, and the light reception signal increases as the light amount increases. Then, the light reception signal is output to the timing detection unit 54, the light reception state display unit 57, and the coordinate calculation unit 56.
  • the position coordinates (x, y) of the light pen 50 are positions where the light receiving element 52 receives light emitted from the image display surface of the panel 10.
  • the timing detection unit 54, the coordinate calculation unit 56, the light reception state display unit 57, and the transmission unit 59 perform the following operation regardless of whether or not the contact switch 53 detects contact.
  • the timing detection unit 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 unit 54 measures a plurality of (for example, five times) light emission time intervals using a timer (not shown in FIG. 5) of the timing detection unit 54. 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 unit 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 part 54 produces a coordinate reference signal on the basis of one of the continuous multiple times (for example, 5 times) light emission.
  • the coordinate reference signal is generated based on the light emission generated at the time to1 in the timing detection period Po of the timing detection subfield SFo.
  • 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. 4, but is, for example, a signal having rising edges at time ty0 and time tx0.
  • 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 unit 54 outputs the coordinate reference signal to the coordinate calculation unit 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 unit 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. 5).
  • the coordinate calculation unit 56 Based on the coordinate reference signal and the light reception signal, the coordinate calculation unit 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 unit 56 counts the time (time Tyy) from the time ty0 to the time (time tyy) at which light reception is first received by the light receiving element 52 after the 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 unit 56 measures, based on the coordinate reference signal, a time (time Txx) from time tx0 to time (time txx) when light is received by the light receiving element 52 for the first time 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 unit 56 outputs the position coordinates (x, y) of the light pen 50 thus calculated to the transmission unit 59.
  • the light reception state display unit 57 compares the light reception signal output from the light receiving element 52 with a preset light reception signal threshold value. Then, whether or not a plurality of times of light emission occurring in the timing detection subfield SFo is received with a sufficient amount of light, whether or not a light emission generated in the y coordinate detection period Py is received with a sufficient amount of light, occurs in the x coordinate detection period Px. It is determined whether light is received with a sufficient amount of light.
  • the light receiving state display unit 57 determines whether the current light receiving state in the light receiving element 52 is “first light receiving state”, “second light receiving state”, or “third light receiving state”.
  • a light reception state signal (light reception state S2) indicating the determination result is transmitted to the transmission unit 59, and the light emitting unit 58 is caused to emit light based on the determination result.
  • the light emission part 58 is comprised by LED (light emitting diode), for example, and can light-emit by switching a some color (for example, red and green).
  • a plurality of times of light emission occurring in the timing detection subfield SFo, light emission occurring in the y coordinate detection period Py, and light emission occurring in the x coordinate detection period Px are received with a sufficient amount of light (light reception signal threshold). Represents a state in which light is received with a light quantity greater than the value.
  • a plurality of times of light emission occurring in the timing detection subfield SFo is received with a light amount equal to or greater than the light reception signal threshold value, but occurs in the y coordinate detection period Py and in the x coordinate detection period Px.
  • At least one of the light emission represents a state in which light is received with a light amount less than a light reception signal threshold.
  • the third light receiving state represents a state in which a plurality of light emissions generated in the timing detection subfield SFo are received with a light amount less than the light receiving signal threshold value.
  • the light receiving state display unit 57 causes the light emitting unit 58 to emit green light in the first light receiving state, and causes the light emitting unit 58 to blink green in the second light receiving state. In this case, the light emitting unit 58 emits red light.
  • the light emitting unit 58 may be a single color. In that case, what is necessary is just to change and display the flashing pattern of the light emission part 58 whether it is a 1st light reception state, a 2nd light reception state, or a 3rd light reception state.
  • the discharge generated in the timing detection period Po of the timing detection subfield SFo is a strong discharge similar to the sustain discharge, and the discharge generated in the y coordinate detection period Py and the discharge generated in the x coordinate detection period Px are maintained.
  • the discharge is weaker than the discharge. Therefore, in the present embodiment, a plurality of times of light emission occurring in the timing detection subfield SFo are light amounts less than the light reception signal threshold value, and light emission occurring in the y coordinate detection period Py and light emission occurring in the x coordinate detection period Px are received. A state where the light intensity is greater than the signal threshold is not considered.
  • the light reception signal threshold value is a light amount that the coordinate calculation unit 56 can correctly calculate the position coordinates using the light reception signal output from the light receiving element 52, and the light reception signal threshold is a predetermined amount that is greater than the light amount. It is desirable to set a numerical value representing the amount of light at which the coordinate calculation unit 56 cannot correctly calculate the position coordinates when the amount of light decreases by a ratio (for example, 20%) or more.
  • the transmission unit 59 has a transmission circuit that encodes an electric signal and converts the encoded signal into a radio signal such as infrared rays and transmits the signal (not shown in FIG. 5).
  • the identification number ID assigned to each light pen 50 independently, the drawing mode S0 of the light pen 50 (for example, the color of the line used for drawing, the thickness of the line, the type of line, etc.), the contact switch 53 A signal representing the state S1, the light reception state S2 determined by the light reception state display unit 57, and the position coordinates (x, y) of the light pen 50 calculated by the coordinate calculation unit 56 are encoded and then converted into a radio signal, and the drawing apparatus Wireless transmission is performed to 40 reception units 42.
  • the drawing apparatus 40 includes a receiving unit 42, a pen state display unit 44, and a drawing unit 46.
  • the drawing device 40 creates a drawing signal based on the position coordinates (x, y) calculated by the coordinate calculation unit 56 of the light pen 50 and outputs the drawing signal to the plasma display device 30.
  • This drawing signal is a signal for displaying on the panel 10 an image handwritten by the user or a cursor used as a pointer, and is substantially the same as the image signal.
  • the drawing device 40 also creates a drawing signal for displaying the drawing mode S0 and the light receiving state S2 of the light pen 50 and outputs the drawing signal to the plasma display device 30.
  • the receiving unit 42 includes a conversion circuit that receives a radio signal wirelessly transmitted from the transmission unit 59 of the light pen 50, decodes the received signal, and converts it into an electric signal (not shown in FIG. 5).
  • the wireless signal wirelessly transmitted from the transmission unit 59 is converted into a signal representing the identification number ID of the light pen 50, the drawing mode S0, the state S1, the light receiving state S2, and the position coordinates (x, y), and the drawing unit 46 is converted. Output to.
  • each signal transmitted from each light pen 50 is received and decoded.
  • signals representing the drawing mode S0, the state S1, the light receiving state S2, and the position coordinates (x, y) of the light pen 50 are variables that change with time t, each signal output from the receiving unit 42 will be described below.
  • the drawing mode S0 (t), the state S1 (t), the light receiving state S2 (t), and the position coordinates (x (t), y (t)) are described.
  • Pen state display unit 44 creates a drawing signal and outputs it to plasma display device 30 in order to display on panel 10 an icon corresponding to each of light pens 50 having received identification number ID.
  • FIG. 6 is a diagram showing an example of the icon of the light pen 50 displayed on the plasma display device 30 according to the embodiment of the present invention.
  • region enclosed with the broken line is shown below.
  • the pen state display unit 44 creates a drawing signal so that the number of icons I equal to the number of light pens 50 used in the plasma display system 100 is displayed on the panel 10, and the plasma is displayed. Output to the display device 30.
  • four light pens 50a, 50b, 50c, 50d are used in the plasma display system 100, and four icons Ia, Ib, corresponding to the light pens 50a, 50b, 50c, 50d, respectively.
  • Ic and Id are displayed in the lower left part of the image display surface of the panel 10.
  • the icon Ia is an icon corresponding to the light pen 50a
  • the icon Ib is an icon corresponding to the light pen 50b
  • the icon Ic is an icon corresponding to the light pen 50c
  • the icon Id is an icon corresponding to the light pen 50d. is there.
  • the pen state display unit 44 creates a drawing signal so that each icon I is displayed with a pattern corresponding to the light receiving state S2 of each light pen 50.
  • the light pen 50 in the first light receiving state displays the icon I with a pattern in which the outline is drawn with a solid line and the inside is filled with a predetermined color (for example, yellow).
  • the light pen 50 in the second light receiving state draws an outline with a solid line and displays the icon I with a pattern that does not fill the inside.
  • the light pen 50 in the third light receiving state draws an outline with a broken line and displays the icon I with a pattern that does not fill the inside.
  • the icon Ia indicates that the light pen 50a is in the first light receiving state
  • the icon Ib indicates that the light pen 50b is in the second light receiving state
  • the icon Ic is the light pen.
  • 50c indicates that the light receiving state is in the third light receiving state
  • the icon Id indicates that the light pen 50d is in the first light receiving state.
  • the drawing unit 46 includes an image memory 47. Then, the drawing unit 46 draws a color and a size corresponding to the drawing mode S0 (t) with the pixel corresponding to the position coordinates (x (t), y (t)) calculated by the coordinate calculation unit 56 as the center. A drawing signal of a pattern (for example, a pattern such as a white circle) is created and written into the image memory 47.
  • a pattern for example, a pattern such as a white circle
  • the drawing signal is accumulated in the image memory 47.
  • the drawing unit 46 determines the position coordinates (x (t), y (t)) so that the trajectories of the light pens 50 are not confused with each other. Are distinguished from each other, and the above-described operation is performed on each light pen 50.
  • the drawing unit 46 outputs the drawing signal stored in the image memory 47 to the image signal processing circuit 31.
  • the image signal processing circuit 31 combines the drawing signal output from the drawing unit 46 and the image signal (or selects one of the drawing signal and the image signal) and converts it into image data. , Output to the subsequent circuit.
  • the graphic input by handwriting with the light pen 50 and the icon I corresponding to each light pen 50 are combined with the image based on the image signal (or alone) 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 stored in the image memory 47 can be partially or totally. You may comprise so that it may erase
  • FIG. 7 is a circuit diagram schematically showing a configuration example of the scan electrode driving circuit 33 of the plasma display device 30 according to the 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 timing signal path 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.
  • the scan pulse generation circuit 70 sequentially applies scan pulses to the 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 waveform voltage generated at the end of the sustain periods Ps1 to Ps8 of the subfields SF1 to SF8, which are image display subfields, and at the end of the timing detection period Po of the timing detection subfield SFo.
  • 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 shown as the input terminal IN63), a downward ramp waveform voltage (gradiently decreasing toward the voltage Vi4 ( Initialization periods Pi1 to Pi8 of subfields SF1 to SF8 that are image display subfields, initialization period Pio of timing detection subfield SFo, initialization period Piy of y coordinate detection subfield SFy, and x coordinate detection subfield SFx In the initializing period Pix, a falling ramp waveform voltage generated in each period).
  • 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. 8 is a circuit diagram schematically showing a configuration example of the sustain electrode drive circuit 34 of the plasma display device 30 according to the 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 path of the timing signal 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 applies a sustain pulse of voltage Vs to sustain electrodes SU1 to SUn.
  • the timing detection pulses V2 and V4 are applied to the sustain electrodes SU1 to SUn.
  • the constant voltage generation circuit 85 includes a switching element Q86 and a switching element Q87. Then, the constant voltage generation circuit 85 includes the initialization periods Pi1 to Pi8 and the writing periods Pw1 to Pw8 of the subfields SF1 to SF8 that are image display subfields, and the initialization period Pio and the writing period Pwo of the timing detection subfield SFo.
  • the voltage Ve is applied to the sustain electrodes SU1 to SUn in the initialization period Piy and the y coordinate detection period Py of the y coordinate detection subfield SFy and in the initialization period Pix and the x coordinate detection period Px of the x coordinate detection subfield SFx. .
  • 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. 9 is a circuit diagram schematically showing a configuration example of the data electrode drive circuit 32 of the plasma display device 30 according to the 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. 9, 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 driving circuit 32 applies the write pulse of the voltage Vd to the write period Pwo of the subfields SF1 to SF8 which are image display subfields and the write period Pwo of the timing detection subfield SFo.
  • FIG. 10 is a diagram schematically showing an example of the operation when detecting the position coordinates of the light pen 50 in the plasma display system 100 according to the embodiment of the present invention.
  • the image display area is indicated by a broken line, but this broken line is not actually displayed on the panel 10.
  • FIG. 11 is a diagram schematically showing an example of a drive voltage waveform when the position coordinate of the light pen 50 is detected in the plasma display system 100 according to the embodiment of the present invention.
  • FIG. 11 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 unit 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. 11 are the same as the drive voltage waveforms shown in FIGS.
  • the time Toy from the time to1 to the time ty0 is determined in advance, and the time Tox from the time to1 to the time tx0 is predetermined.
  • the timing detection unit 54 can generate a coordinate reference signal having rising edges at each of the time ty0 and the time tx0 and output the coordinate reference signal to the coordinate calculation unit 56 as shown in FIG. it can.
  • the timing detector 54 emits five consecutive light emission intervals in which the light emission intervals 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 tip of the light pen 50 is in contact with (or close to) the “coordinates (x, y)” of the image display surface of the panel 10, at the time tyy when the horizontal line Ly passes the coordinates (x, y), the light
  • the light receiving element 52 of the pen 50 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. 10, the image display area of the panel 10 is sequentially moved from the left end (first pixel column) to the right end (m / 3 pixel column) of the image display area. One vertical line Lx is displayed.
  • the tip of the light pen 50 is in contact with (or close to) the “coordinate (x, y)” of the image display surface of the panel 10, at the time txx when the vertical line Lx passes the coordinate (x, y),
  • the light receiving element 52 of the light pen 50 receives the light emission of the vertical line Lx.
  • 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 unit 56 shown in FIG. 5 is based on the coordinate reference signal output from the timing detection unit 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 unit 56 is provided internally based on the coordinate reference signal output from the timing detection unit 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 unit 56 in the present embodiment calculates the position (coordinates (x, y)) of the light pen 50 in the image display area.
  • FIG. 12A is a diagram schematically showing an example of an operation when performing handwriting input with the light pen 50 in the plasma display system 100 according to the embodiment of the present invention.
  • FIG. 12B is a diagram schematically showing another example of the operation when performing handwritten input with the light pen 50 in the plasma display system 100 according to the embodiment of the present invention.
  • the drawing unit 46 When the light pen 50 is in the first light receiving state, the drawing unit 46 focuses on the pixel corresponding to the position coordinate (x (t), y (t)) calculated by the coordinate calculation unit 56, and draws the drawing mode S0 ( A drawing signal of a drawing pattern (for example, a pattern such as a white circle, hereinafter referred to as “cursor 101”) having a color and size corresponding to t) is generated.
  • the plasma display device 30 displays an image on the panel 10 based on the drawing signal stored in the image memory 47 of the drawing unit 46.
  • the panel 10 displays a graphic input by handwriting using the light pen 50.
  • the drawing signal based on the drawing mode S0 (t) are written in the image memory 47, and the drawing signal based on the drawing signal (position coordinates (x (t-1), y (t-1)) one field before). ) Is deleted from the image memory 47.
  • the light receiving element 52 sufficiently receives the light emitted from the panel 10, and the light pen 50 is in the first light receiving state. If so, a cursor 101 indicating the position coordinates of the light pen 50 is displayed on the panel 10. Therefore, it is possible to use the light pen 50 as a pointer. Further, by attaching a lens to the tip of the light pen 50, the light receiving element 52 can sufficiently receive the light emitted from the panel 10 even when the light pen 50 is further away from the panel 10, and the light pen 50 can If the light receiving state of 1 can be maintained, the light pen 50 can be used as a pointer from a more distant position.
  • the light pen 50 is too far away from the panel 10, and the light receiving element 52 of the light pen 50 cannot sufficiently receive the light emitted from the panel 10, and the light pen 50 is in the second light receiving state. Or if it will be in the 3rd light reception state, icon I will change to the symbol showing the 2nd light reception state or the 3rd light reception state.
  • the light emitting unit 58 is also in the light emitting state representing the second light receiving state or the third light receiving state. Thus, the user can easily grasp the current light receiving state of the light pen 50 through the icon I or the light emitting unit 58.
  • the user changes the position and orientation of the light pen 50 so that the icon I is maintained in the first light receiving state or the light emitting state of the light emitting unit 58 is maintained in the first light receiving state.
  • the light pen 50 can be held in an appropriate position or orientation, and the light pen 50 can be used in an appropriate state.
  • the icon I represents the second light receiving state or the third light receiving state even though the light pen 50 is held in an appropriate position and orientation, the user may have some trouble in the plasma display. It is possible to easily grasp what has occurred in the system 100.
  • the cursor 101 is not displayed on the panel 10, or the coordinates when the light receiving element 52 last receives the light emission of the panel 10 are displayed. What is necessary is just to set appropriately, such as displaying the cursor 101 in a position.
  • the configuration in which the contact switch 53 is attached to the tip of the light pen 50 has been described.
  • a manual switch corresponding to the contact switch 53 is provided on the side surface of the light pen 50, and the user switches the switch. You may comprise so that operation of ON / OFF of can be operated.
  • the light pen 50 may include both the contact switch 53 and the manual switch.
  • each switch may have a different function, such as using the contact switch 53 as a handwriting input switch and using a manual switch for switching between displaying and hiding the cursor.
  • 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 present embodiment it is desirable to set the time intervals for generating the timing detection discharge a plurality of times in order to easily identify the first timing detection discharge.
  • 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.
  • the present invention is not limited to this configuration. Absent.
  • the configuration may be such that those subfields are generated at a rate of once in a plurality of fields.
  • the emission color of the light emitting unit 58 is not limited to two colors of red and green.
  • the light emitting unit 58 only needs to be able to distinguish and display the first light receiving state, the second light receiving state, and the third light receiving state.
  • the drawing device and the light pen may be electrically connected by an electric cable or the like, and a signal may be transmitted and received between the light pen and the drawing device via the electric cable.
  • the timing detection subfield SFo may not be provided.
  • each subfield is not limited to the order shown in the embodiment.
  • 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.
  • 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 effect as that described above can be obtained by applying the same configuration as that described above.
  • 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 the image display subfield.
  • 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.
  • the drawing device 40 is provided independently of the plasma display device.
  • a computer connected to the plasma display device corresponds to the drawing device 40.
  • a rendering signal is created using the computer.
  • the present invention is not limited to this configuration.
  • the drawing device 40 may be provided as a single device, or the drawing device 40 may be provided in the plasma display device 30.
  • the drive voltage waveforms shown in FIGS. 3, 4, and 11 are merely examples in the embodiment of the present invention, and the present invention is not limited to these drive voltage waveforms.
  • circuit configurations shown in FIGS. 5, 7, 8, and 9 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 is useful as an image display system, an image display system driving method, and a light pen because the light pen can be easily used while being held in an appropriate position and in an appropriate orientation.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)

Abstract

L'invention a pour objet de faciliter le maintien et l'utilisation d'un pointeur optique (50) dans un emplacement approprié. Pour ce faire, dans un système d'affichage d'image (100) comprenant un dispositif d'affichage d'image (30), un pointeur optique et un dispositif de rendu (40), le pointeur optique reçoit la lumière émise qui se produit dans une unité d'affichage d'image (10) dans un sous-champ de détection de synchronisation, un sous-champ de détection de coordonnée y et un sous-champ de détection de coordonnée x, génère un signal de lumière reçue, compare le signal de lumière avec un seuil de signal de lumière reçue, détermine l'état présent de réception de lumière, et émet un signal qui comprend le résultat de cette détermination. Le dispositif de rendu reçoit le signal qui est émis à partir du pointeur optique et crée un signal de rendu qui représente le résultat de la comparaison. Le dispositif d'affichage d'image affiche, dans l'unité d'affichage d'image, une image en fonction du signal de rendu qui est émis à partir du dispositif de rendu.
PCT/JP2013/000863 2012-04-27 2013-02-18 Système d'affichage d'image, procédé d'entraînement de système d'affichage d'image et pointeur optique WO2013161144A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2012102202A JP2015132860A (ja) 2012-04-27 2012-04-27 ライトペン、および画像表示システム
JP2012-102203 2012-04-27
JP2012102203A JP2015132861A (ja) 2012-04-27 2012-04-27 描画装置、および画像表示システム
JP2012-102202 2012-04-27

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50108838A (fr) * 1974-01-31 1975-08-27
JPH01295323A (ja) * 1988-05-24 1989-11-29 Fujitsu Ltd ライトペンの検知方式
JPH03113526A (ja) * 1989-09-27 1991-05-14 Toshiba Corp タッチパネルシステム
JPH03198124A (ja) * 1989-12-27 1991-08-29 Sanyo Electric Co Ltd 情報表示装置
JPH04157520A (ja) * 1990-10-22 1992-05-29 Sanyo Electric Co Ltd ホームコントローラ
JPH09244791A (ja) * 1996-03-11 1997-09-19 Canon Inc 情報入力装置、ディスプレイおよび情報入力方法
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
JP2003099199A (ja) * 2001-09-20 2003-04-04 Ricoh Co Ltd 座標入力装置
JP2007156943A (ja) * 2005-12-07 2007-06-21 Matsushita Electric Ind Co Ltd テレビジョン座標検出装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50108838A (fr) * 1974-01-31 1975-08-27
JPH01295323A (ja) * 1988-05-24 1989-11-29 Fujitsu Ltd ライトペンの検知方式
JPH03113526A (ja) * 1989-09-27 1991-05-14 Toshiba Corp タッチパネルシステム
JPH03198124A (ja) * 1989-12-27 1991-08-29 Sanyo Electric Co Ltd 情報表示装置
JPH04157520A (ja) * 1990-10-22 1992-05-29 Sanyo Electric Co Ltd ホームコントローラ
JPH09244791A (ja) * 1996-03-11 1997-09-19 Canon Inc 情報入力装置、ディスプレイおよび情報入力方法
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
JP2003099199A (ja) * 2001-09-20 2003-04-04 Ricoh Co Ltd 座標入力装置
JP2007156943A (ja) * 2005-12-07 2007-06-21 Matsushita Electric Ind Co Ltd テレビジョン座標検出装置

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