WO2014006880A1 - Dispositif d'affichage d'image, procédé d'attaque de dispositif d'affichage d'image et système d'affichage d'image - Google Patents

Dispositif d'affichage d'image, procédé d'attaque de dispositif d'affichage d'image et système d'affichage d'image Download PDF

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Publication number
WO2014006880A1
WO2014006880A1 PCT/JP2013/004092 JP2013004092W WO2014006880A1 WO 2014006880 A1 WO2014006880 A1 WO 2014006880A1 JP 2013004092 W JP2013004092 W JP 2013004092W WO 2014006880 A1 WO2014006880 A1 WO 2014006880A1
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WIPO (PCT)
Prior art keywords
discharge
image display
subfield
voltage
coordinate
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PCT/JP2013/004092
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English (en)
Japanese (ja)
Inventor
貴彦 折口
裕也 塩崎
一朗 坂田
秀彦 庄司
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パナソニック株式会社
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Publication of WO2014006880A1 publication Critical patent/WO2014006880A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03542—Light pens for emitting or receiving light
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G06F3/0386—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry for light pen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0238—Improving the black level
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • G09G3/2965—Driving circuits for producing the waveforms applied to the driving electrodes using inductors for energy recovery

Definitions

  • the present disclosure relates to an image display device capable of inputting characters and drawings using an electronic pen, a driving method of the image display device, and an image display system.
  • one pixel is composed of three sub-pixels of red, green, and blue, and an image is displayed in the image display area.
  • a plasma display panel (hereinafter abbreviated as “panel”) has a large number of discharge cells as sub-pixels, and displays gradation in each discharge cell by combining binary control of light emission and non-light emission.
  • Each discharge cell is coated with a phosphor that emits light of any one of red, green, and blue, and a discharge gas is sealed therein.
  • Each discharge cell emits a phosphor by generating a discharge.
  • a subfield method in which one field is divided into a plurality of subfields and light emission / non-light emission of each subfield is controlled according to the gradation value to be displayed. Is used.
  • the initializing operation includes a forced initializing operation for forcibly generating an initializing discharge in a discharge cell and a selective initializing operation for generating an initializing discharge only in a discharge cell that has generated an address discharge in the immediately preceding subfield.
  • Patent Document 1 discloses a subfield method in which a forced initialization operation is performed once per field. In this method, the brightness of the discharge cells that display black can be lowered and the contrast of the display image can be improved.
  • Some of these image display apparatuses have a function of allowing handwriting input of characters and drawings on the image display surface using a pen-type pointing device called “electronic pen” or “light pen”. is there.
  • a technique for detecting the position of the electronic pen in the image display area is used.
  • the coordinates representing the position of the electronic pen in the image display area are referred to as “position coordinates”.
  • Patent Document 2 discloses a coordinate position detection apparatus and a coordinate position detection method for a plasma display panel that detect a coordinate position on the plasma display panel using an optical sensor.
  • the driving method of the image display device is a driving method of an image display device including a plasma display panel in which discharge cells are formed at intersections of scan electrodes, sustain electrodes, and data electrodes.
  • an image display subfield for displaying an image on the plasma display panel and a synchronization detection subfield for generating a discharge for calculating position coordinates are generated.
  • an address pulse is applied to the data electrode and a scan pulse is applied to the scan electrode to generate an address discharge in the discharge cell, and a sync detection pulse is applied alternately to the scan electrode and the sustain electrode.
  • a synchronization detection period for generating a synchronization detection discharge in the discharge cell.
  • an address pulse is applied only to the data electrodes of the discharge cells that emit a predetermined color, and an address discharge is generated only in the discharge cells that emit the predetermined color.
  • the y-coordinate detection period in which the y-coordinate detection voltage is applied to the data electrode and the y-coordinate detection pulse is sequentially applied to the scan electrode to generate the y-coordinate detection discharge in the discharge cell.
  • a y-coordinate detection subfield having In the y-coordinate detection period the y-coordinate detection voltage is applied only to the data electrodes of the discharge cells other than the discharge cells emitting a predetermined color, and the y-coordinate detection is performed only to the discharge cells other than the discharge cells emitting the predetermined color.
  • a discharge may be generated.
  • the x coordinate detection period in which the x coordinate detection voltage is applied to the scan electrode and the x coordinate detection pulse is sequentially applied to the data electrode to generate the x coordinate detection discharge in the discharge cell.
  • An x-coordinate detection subfield having Then, in the x-coordinate detection period, the x-coordinate detection pulse is sequentially applied only to the data electrodes of the discharge cells other than the discharge cells emitting a predetermined color, and the x-coordinate is applied only to the discharge cells other than the discharge cells emitting the predetermined color.
  • a detection discharge may be generated.
  • an address pulse may be applied to generate an address discharge only in a specific discharge cell that emits a predetermined color.
  • An image display apparatus drives a plasma display panel in which discharge cells are formed at intersections of scan electrodes, sustain electrodes, and data electrodes, and one field is composed of a plurality of subfields.
  • An image display device including a drive circuit.
  • the driving circuit generates an image display subfield for displaying an image on the plasma display panel and a synchronization detection subfield for generating a discharge for calculating the position coordinates, and a write pulse is applied to the data electrode in the synchronization detection subfield.
  • a detection period in which a scan pulse is applied to the scan electrode to generate an address discharge in the discharge cell, and a synchronization detection pulse is applied to the scan electrode and the sustain electrode alternately to generate a sync detection discharge in the discharge cell.
  • a detection period is applied only
  • An image display system includes: a plasma display panel in which discharge cells are formed at intersections of scan electrodes, sustain electrodes, and data electrodes; an image display device including a drive circuit that drives the plasma display panel; A pen and a drawing device are provided.
  • the driving circuit includes an image display subfield for displaying an image on the plasma display panel, a synchronization detection subfield for generating a discharge for calculating position coordinates in the discharge cell, and a y coordinate for generating a y coordinate detection discharge in the discharge cell.
  • a detection subfield and an x-coordinate detection subfield for generating an x-coordinate detection discharge in the discharge cell are generated.
  • the address pulse is applied to the data electrode and the scan pulse is applied to the scan electrode to generate the address discharge in the discharge cell, and the synchronization detection pulse is alternately applied to the scan electrode and the sustain electrode. And a synchronization detection period for generating a synchronization detection discharge in the discharge cell. Then, in the address period of the synchronization detection subfield, an address pulse is applied only to the data electrodes of the discharge cells that emit a predetermined color, and an address discharge is generated only in the discharge cells that emit the predetermined color.
  • the electronic pen includes a light receiving element that receives light emitted from the plasma display panel and outputs a light reception signal, a synchronization detection unit that generates a coordinate reference signal synchronized with the y coordinate detection subfield and the x coordinate detection subfield based on the light reception signal, and A coordinate calculation unit that calculates coordinates on the plasma display panel pointed to by the electronic pen based on the coordinate reference signal and the light reception signal, and a transmission unit that transmits the coordinates calculated by the coordinate calculation unit to the drawing apparatus.
  • the drawing apparatus includes a receiving unit that receives coordinates transmitted from the electronic pen, and a drawing unit that generates a drawing signal based on the coordinates received by the receiving unit and outputs the drawing signal to the image display device.
  • FIG. 1 is an exploded perspective view illustrating an example of a structure of a panel used in the image display device according to the first embodiment of the present disclosure.
  • FIG. 2 is a diagram illustrating an example of the electrode arrangement of the panel used in the image display device according to the first embodiment of the present disclosure.
  • FIG. 3 is a diagram schematically illustrating an example of a drive voltage waveform applied to each electrode of the panel in the image display subfield according to the first embodiment of the present disclosure.
  • FIG. 4 is a diagram schematically illustrating an example of a drive voltage waveform applied to each electrode of the panel in the coordinate detection subfield according to the first embodiment of the present disclosure.
  • FIG. 5 is a diagram schematically illustrating a configuration example of the image display system according to the first embodiment of the present disclosure.
  • FIG. 1 is an exploded perspective view illustrating an example of a structure of a panel used in the image display device according to the first embodiment of the present disclosure.
  • FIG. 2 is a diagram illustrating an example of the electrode arrangement of the panel
  • FIG. 6 is a circuit diagram schematically illustrating a configuration example of the sustain electrode driving unit of the image display device according to the first embodiment of the present disclosure.
  • FIG. 7 is a circuit diagram schematically illustrating a configuration example of the data electrode driving unit of the image display device according to the first embodiment of the present disclosure.
  • FIG. 8 is a circuit diagram schematically illustrating a configuration example of the scan electrode driving unit of the image display apparatus according to the first embodiment of the present disclosure.
  • FIG. 9 is a diagram schematically illustrating an example of a position coordinate detection operation when the electronic pen is used in the image display system according to the first embodiment of the present disclosure.
  • FIG. 10 is a diagram schematically illustrating an example of an operation when the electronic pen is used in the image display system according to the first embodiment of the present disclosure.
  • FIG. 10 is a diagram schematically illustrating an example of an operation when the electronic pen is used in the image display system according to the first embodiment of the present disclosure.
  • FIG. 11 is a diagram schematically illustrating an example of an operation when performing handwritten input with the electronic pen in the image display system according to the first embodiment of the present disclosure.
  • FIG. 12 is a diagram schematically illustrating an example of a drive voltage waveform applied to each electrode of the panel in the coordinate detection sub-field according to the second embodiment of the present disclosure.
  • FIG. 1 is an exploded perspective view illustrating an example of the structure of the panel 10 used in the image display device according to the first embodiment of the present disclosure.
  • the front substrate 11 On the front substrate 11 made of glass, a plurality of display electrode pairs 14 composed of the scanning electrodes 12 and the sustain electrodes 13 are formed, and a dielectric layer 15 is formed so as to cover the display electrode pairs 14, and the dielectric layer 15 A protective layer 16 is formed thereon.
  • 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 cross each other with the discharge space interposed therebetween, and a discharge gas is sealed in the discharge space.
  • the discharge space is divided into a plurality of sections by the barrier ribs 24, and discharge cells are formed in areas where the display electrode pairs 14 and the data electrodes 22 intersect.
  • one pixel is constituted by 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) (hereinafter referred to as “red discharge cell”), and a phosphor cell 25G having a green (G).
  • red discharge cell a discharge cell having a phosphor layer 25R and emitting red
  • green discharge cell a phosphor cell 25G having a green (G).
  • a discharge cell that emits light hereinafter referred to as “green discharge cell”
  • a discharge cell that has the phosphor layer 25B and emits blue (B) hereinafter referred to as “blue discharge cell”. That is, in the panel 10, one pixel is constituted by discharge cells of three colors of red, green, and blue.
  • the panel 10 is not limited to the structure described above, and may be provided with, for example, a stripe-shaped partition wall.
  • FIG. 2 is a diagram illustrating an example of an electrode arrangement of the panel 10 used in the image display device according to the first embodiment of the present disclosure.
  • 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, line direction, or x coordinate direction), and the second direction is referred to as a column direction (or vertical direction or y coordinate direction).
  • a set of red, green, and blue discharge cells adjacent to each other constitutes one pixel. Therefore, m discharge cells are formed on one pair of display electrodes 14 and m / 3 pixels are formed. Then, m ⁇ n discharge cells are formed in the discharge space, and an area where m ⁇ n discharge cells are formed becomes an image display area of the panel 10.
  • Discharge cell The discharge cell having the data electrode Dp + 1 is coated with a phosphor layer 25G, and this discharge cell becomes a green discharge cell.
  • a phosphor layer 25B is applied to the discharge cell having the data electrode Dp + 2, and this discharge cell becomes a blue discharge cell.
  • one field includes a period during which an image is displayed on the image display unit and a period during which a coordinate detection pattern is displayed on the image display unit in order to detect “position coordinates” of the electronic pen.
  • the period during which an image is displayed on the image display unit is, for example, a plurality of image display subfields (shown in FIG. 3) for displaying an image on the panel 10.
  • the period during which the coordinate detection pattern is displayed on the image display unit is, for example, a plurality of coordinate detections in which the x coordinate detection pattern and the y coordinate detection pattern for detecting the “position coordinates” of the electronic pen are displayed on the panel 10. It is a subfield (shown in FIG. 4).
  • “Position coordinates” refers to the coordinates of the position indicated by the electronic pen in the image display area of the panel 10 (coordinates indicating the position of the electronic pen).
  • Each image display subfield has an initialization period, an address period, and a sustain period.
  • the image display subfield is also simply referred to as a subfield.
  • a “forced initialization operation” that forcibly generates an initialization discharge in the discharge cells and a discharge cell that generates an address discharge in the address period of the immediately preceding subfield are selectively used.
  • a “selective initialization operation” that generates an initialization discharge.
  • the number of image display subfields in one field is eight (subfields SF1 to SF8), and the luminance weight of each subfield is, for example, (1, 34, 21, 13, 8, 5, 3, 2).
  • the number of subfields, the luminance weight, etc. are not limited to the above numerical values.
  • FIG. 3 is a diagram schematically illustrating an example of a drive voltage waveform applied to each electrode of the panel 10 in the image display subfield according to the first embodiment of the present disclosure.
  • Scan electrode SCi, sustain electrode SUi, and data electrode Dk in the following represent electrodes selected from each electrode based on image data (data indicating light emission / non-light emission for each subfield).
  • each subfield after subfield SF3 generates a drive voltage waveform substantially similar to that of subfield SF2, except for the number of sustain pulses.
  • the voltage 0 (V) is applied to each of the data electrodes D1 to Dm and the sustain electrodes SU1 to SUn.
  • an upward ramp waveform voltage that gradually rises from voltage Vi1 lower than the discharge start voltage to voltage Vi2 exceeding the discharge start voltage is applied.
  • the voltage 0 (V) is applied to the data electrodes D1 to Dm, and the positive voltage Ve is applied to the sustain electrodes SU1 to SUn.
  • a downward ramp waveform voltage that gently falls from scan voltage SC1 to SCn to a negative voltage Vi4 that exceeds the discharge start voltage is applied to scan electrode SC1 to SCn.
  • the initializing discharge is generated in each discharge cell by this forced initializing operation, and the wall voltage on each electrode is adjusted to a voltage suitable for the address operation in the subsequent address period Pw1.
  • the driving voltage waveform generated in the initialization period Pi1 is referred to as a forced initialization waveform.
  • discharge cells to which the forced initializing waveform is applied in the forced initializing operation may be all the discharge cells in the image display area of the panel 10, but, for example, some discharges in the image display area It may be a cell. The same applies to all subfields that perform the forced initialization operation in the following description.
  • a negative scan pulse having a negative voltage Va is applied to the scan electrode SC1 in the first row, and data of discharge cells to be emitted in the first row of the data electrodes D1 to Dm.
  • a positive address pulse having a positive voltage Vd is applied to the electrode Dk.
  • the same addressing operation is sequentially performed in the order of scan electrodes SC2, SC3, SC4,..., SCn up to the discharge cell in the nth row.
  • the number of sustain pulses obtained by multiplying the brightness weight by a predetermined brightness multiple is alternately applied to the scan electrodes SC1 to SCn and the sustain electrodes SU1 to SUn.
  • a discharge cell that has generated an address discharge in the immediately preceding address period Pw1 generates a number of sustain discharges corresponding to the luminance weight, and emits light at a luminance corresponding to the luminance weight.
  • 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 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 falls from a voltage (for example, voltage 0 (V)) that is lower than the discharge start voltage to a negative voltage Vi4 is applied to scan electrodes SC1 to SCn.
  • a weak initializing discharge is generated in the discharge cell that has generated the sustain discharge in the sustain period Ps1 of the immediately preceding subfield SF1, and the wall voltage on each electrode is changed to the address operation in the subsequent address period Pw2.
  • the wall voltage is adjusted to a suitable level.
  • An initializing discharge does not occur in a discharge cell in which no sustain discharge has occurred in the sustain period Ps1 of the immediately preceding subfield SF1.
  • the drive voltage waveform generated in the initialization period Pi2 is referred to as a selective initialization waveform.
  • each subfield after subfield SF3 the same drive voltage waveform as in subfield SF2 is applied to each electrode except for the number of sustain pulses.
  • FIG. 4 is a diagram schematically illustrating an example of a drive voltage waveform applied to each electrode of the panel 10 in the coordinate detection subfield according to the first embodiment of the present disclosure.
  • the coordinate detection subfield includes a synchronization detection subfield SFo, a y coordinate detection subfield SFy, and an x coordinate detection subfield SFx.
  • the position indicated by the electronic pen in the image display area (hereinafter also referred to as “position of the electronic pen”) is represented by an x coordinate and ay coordinate.
  • the coordinate in the row direction is the x coordinate
  • the coordinate in the column direction is the y coordinate.
  • the x coordinate detection subfield SFx and the y coordinate detection subfield SFy are subfields for detecting the x coordinate and the y coordinate.
  • the electronic pen is provided in the image display system according to the present embodiment, and is used by a user to input characters and drawings on the panel 10 by handwriting. Details of the electronic pen will be described later.
  • the position (positional coordinate) pointed to by the electronic pen is a light receiving element of the electronic pen, which will be described later, displayed in the light emission of the x coordinate detection pattern displayed in the x coordinate detection subfield SFx and in the y coordinate detection subfield SFy. It is a position in the image display surface that receives light emitted from the y coordinate detection pattern.
  • wireless communication is performed between the electronic pen and a drawing apparatus described later.
  • the electronic pen calculates the position coordinates of the electronic pen inside the electronic pen, and transmits data of the calculated position coordinates from the electronic pen to the drawing apparatus by wireless communication.
  • the synchronization detection subfield SFo is a subfield for the electronic pen to accurately grasp the timing at which the coordinate detection subfield is generated in the image display device.
  • the electronic pen receives light emitted in the synchronization detection subfield SFo to generate a signal (coordinate reference signal) serving as a reference for calculating position coordinates with high accuracy by synchronizing with the image display device. It becomes possible.
  • each subfield is not limited to the order of this embodiment. Further, the coordinate detection subfield is not necessarily provided in each field.
  • the synchronization detection subfield SFo in FIG. 4 has an initialization period Pio, a writing period Pwo, and a synchronization detection period Po.
  • the same forced voltage operation 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.
  • data electrodes D1 to Dm may be in a high impedance state as shown in FIG. 4, or a voltage of 0 (V) as in initialization period Pi1. ) May be left applied.
  • sustain electrodes SU1 to SUn may be in a high impedance state after applying voltage Ve as shown in FIG. 4, or applied with voltage Ve. You can leave it.
  • the initializing discharge is generated in each discharge cell by this forced initializing operation, and the wall voltage on each electrode is adjusted to a voltage suitable for the address operation in the subsequent address period Pwo.
  • 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 after the high impedance state
  • the scan electrodes SC1 to SCn Is applied with a voltage Vc.
  • an address pulse of voltage Vd is applied only to the data electrode 22 corresponding to the discharge cell that emits a predetermined color.
  • a voltage 0 (V) is applied to the other data electrodes 22 without applying an address pulse.
  • the predetermined color is blue
  • the address period Pwo only the data electrode 22 corresponding to the blue discharge cell (in this embodiment, data electrodes D3, D6, D9,..., Dm) is written.
  • a pulse voltage Vd is applied, and the voltage 0 (the data electrodes D1, D2, D4, D5,..., Dm-2, Dm-1) corresponding to the red and green discharge cells are set to the voltage 0 ( V) is applied.
  • 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. In this embodiment, this state is maintained from time to0 to time To0. During this period, after the last address discharge has occurred in the discharge cells, a state in which no discharge occurs is maintained. Note that time to0 is the time when a scan pulse for generating the last address discharge in the address period Pwo is applied to the scan electrode 12 (for example, the scan electrode SCn in FIG. 4).
  • a plurality of times of light emission (light emission for synchronization detection) serving as a reference at the time of position coordinate calculation in the electronic pen are performed in a predetermined color (for example, blue) of the panel 10. It is generated in the discharge cell.
  • the discharge cells for example, blue discharge cells
  • the light emission for synchronization detection for example, blue light emission
  • synchronization detection is performed on discharge cells that emit light of a predetermined color (for example, blue) at predetermined time intervals (for example, time To1, time To2, and time To3).
  • Discharge is generated a plurality of times (for example, four times), and light emission for synchronization detection (for example, blue light emission) is generated a plurality of times (for example, four times).
  • the synchronous detection discharge is a discharge similar to the sustain discharge, and is a stronger discharge than the address discharge, and has higher luminance than the light emission generated in the address period Pwo.
  • the discharge cells that generate the synchronous detection discharge are discharge cells that emit a predetermined color, and are only 1/3 of the discharge cells (for example, blue discharge cells).
  • the synchronous detection discharge does not occur in the entire 2/3 discharge cells (for example, red and green discharge cells). For this reason, in the synchronization detection period Po in the present embodiment, the luminance of light emission caused by the synchronization detection discharge is reduced to about 1/3 compared to the conventional configuration in which the synchronization detection discharge is generated in all the discharge cells. can do.
  • the electronic pen emits light for synchronization detection (for example, blue light emission) a plurality of times (for example, four times) that occur at predetermined time intervals (for example, time To1, time To2, and time To3). Is received and a coordinate reference signal is created.
  • the coordinate reference signal is a signal that serves as a reference when calculating the position coordinate (x, y) of the electronic pen.
  • the entire surface of the image display surface of the panel 10 shines in a predetermined color (for example, blue) all at the same timing, so that the position coordinate of the electronic pen is at any position in the image display area of the panel 10. Even if it exists, the electronic pen can receive this light emission at the same timing.
  • a predetermined color for example, blue
  • the time To0 is set to a time longer than any of the time To1, the time To2, and the time To3. This is because the electronic pen emits light by the address discharge generated in the address period Pwo of the synchronization detection subfield SFo, by the y coordinate detection discharge of the y coordinate detection subfield SFy or the x coordinate detection discharge of the x coordinate detection subfield SFx. This is to prevent erroneous recognition of light emission.
  • the time To0 is about 50 ⁇ sec
  • the time To1 is about 40 ⁇ sec
  • the time To2 is about 20 ⁇ sec
  • the time To3 is about 30 ⁇ sec.
  • each of the times To0 to To3 is not limited to the numerical values described above, and each time may be set appropriately according to the specifications of the image display system 100 and the like.
  • a y-coordinate detection subfield SFy and an x-coordinate detection subfield SFx are generated.
  • 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.
  • a group of discharge cells constituting one column is referred to as a “discharge cell column”
  • a group of discharge cells (pixel column) composed of three adjacent discharge cell columns is referred to as a “pixel column”.
  • the y-coordinate detection subfield SFy has an initialization period Piy, a y-coordinate detection period Py, and an erase period Pey.
  • a selective initialization operation is performed.
  • the voltage 0 (V) is applied to each of the data electrodes D1 to Dm and the sustain electrodes SU1 to SUn, and the voltage from the voltage 0 (V) to the negative voltage Vi4 is applied to the scan electrodes SC1 to SCn.
  • a downward ramp waveform voltage that gently falls is applied.
  • voltage Vs is applied to scan electrodes SC1 to SCn while voltage 0 (V) is applied to data electrodes D1 to Dm and sustain electrodes SU1 to SUn.
  • the voltage 0 (V) applied to the data electrodes D1 to Dm the voltage 0 (V) is applied to the scan electrodes SC1 to SCn, and the voltage Vs is applied to the sustain electrodes SU1 to SUn.
  • the voltage Ve is applied to the sustain electrodes SU1 to SUn, and a downward ramp waveform voltage that gently falls from the voltage 0 (V) to the negative voltage Vi4 is applied to the scan electrodes SC1 to SCn.
  • a downward ramp waveform voltage When applying a downward ramp waveform voltage to scan electrodes SC1 to SCn, sustain electrodes SU1 to SUn may be in a high impedance state after application of voltage Ve as shown in FIG. May be.
  • the initialization period Piy a weak initialization discharge is generated in the discharge cells in which the synchronization detection discharge has occurred in the synchronization detection period Po, and the wall voltage of those discharge cells is initialized.
  • the initialization period Piy since the discharge cell that has generated the synchronous detection discharge does not generate the discharge in the subsequent y coordinate detection period Py, the initialization period Piy can be omitted.
  • the sustain electrodes SU1 to SUn are applied with the voltage Ve after being in a high impedance state, and the data electrodes D1 to Dm have a voltage of 0 (V). And voltage Vc is applied to scan electrodes SC1 to SCn.
  • a positive y-coordinate detection voltage Vdy is applied to the data electrode 22 corresponding to a discharge cell that emits a color other than a predetermined color, and the discharge cell emits a predetermined color.
  • the voltage 0 (V) is applied to the data electrode 22 to be applied without applying the y-coordinate detection voltage Vdy.
  • data electrodes 22 for example, data electrodes D1, D2, D4, D5,..., Dm ⁇ 2) corresponding to red and green discharge cells are used.
  • Dm ⁇ 1 is applied with the y-coordinate detection voltage Vdy
  • the voltage 0 is applied to the data electrode 22 (in this embodiment, the data electrodes D3, D6, D9,..., Dm) corresponding to the blue discharge cell. Apply (V).
  • This first pixel row is, for example, a pixel row arranged at the upper end of the image display area.
  • Discharge occurs in the discharge cell row (pixel row) at the intersection of the data electrode 22 to which the y-coordinate detection voltage Vdy is applied and the scan electrode SC1 to which the y-coordinate detection pulse of the voltage Vay is applied.
  • the first pixel row is discharged all at once except for discharge cells that emit light of a predetermined color, and the first pixel row emits light.
  • this discharge is also referred to as “y-coordinate detection discharge”.
  • Light emission by this y-coordinate detection discharge is light emission for y-coordinate detection when the electronic pen is used.
  • the same operation is sequentially performed in the order of the second pixel row, the third pixel row,..., And the last pixel row.
  • y coordinate detection discharge is sequentially generated in each pixel row from the uppermost pixel row to the lowermost pixel row of the panel 10 except for discharge cells emitting a predetermined color.
  • the color of light emitted by the y-coordinate detection discharge is a complementary color of a predetermined color. For example, if the predetermined color is blue, the color of light emitted by the y-coordinate detection discharge is yellow, which is a mixture of red and green.
  • each pixel row (discharge) from the first row to the nth row (for example, 1080th row) is excluded except for discharge cells that emit light of a predetermined color.
  • y-coordinate detection discharge is sequentially generated.
  • a light emission pattern is displayed on the panel 10 in which one horizontal line that emits light of a predetermined complementary color (for example, yellow) sequentially moves one pixel line at a time from the upper end to the lower end of the image display area of the panel 10.
  • this light emission pattern is referred to as a “y coordinate detection pattern”.
  • one light emission line extending in the x coordinate direction generated in the y coordinate detection period Py is also referred to as a “first light emission line”.
  • the timing at which the electronic pen receives light emitted from the first light emission line varies depending on where the position coordinate of the electronic pen is in the image display area of the panel 10.
  • the y coordinate of the position coordinate (x, y) of the electronic pen in the image display area can be detected by detecting the timing at which the light emission of the first light emission line is received by the electronic pen.
  • the time during which the voltage Vay of the y coordinate detection pulse is applied 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, an x-coordinate detection period Px, and an erasing period Pex.
  • the initialization period Pix of the x coordinate detection subfield SFx a forced initialization operation is performed.
  • the voltage 0 (V) is applied to the data electrodes D1 to Dm and the sustain electrodes SU1 to SUn, and the voltage 0 (V) is applied to the scan electrodes SC1 to SCn.
  • An upward ramp waveform voltage that gently rises from Vi1 to voltage Vi2 is applied.
  • data electrodes D1 to Dm may be in a high impedance state as shown in FIG. 4, or the voltage 0 (V) is kept applied. Also good.
  • the voltage 0 (V) is applied to the data electrodes D1 to Dm, and the voltage Ve is applied to the sustain electrodes SU1 to SUn.
  • Scan electrodes SC1 to SCn are applied with a downward ramp waveform voltage that gradually decreases from voltage 0 (V) to negative voltage Va, and then increases gradually from voltage 0 (V) to voltage Vr.
  • a ramp waveform voltage is applied, and then a ramp waveform voltage that gently falls from the voltage 0 (V) to the x coordinate detection voltage Vax is applied.
  • initialization discharge occurs in all the discharge cells in the image display area of the panel 10, and the wall voltages of all the discharge cells are displayed in the x coordinate detection pattern display operation in the subsequent x coordinate detection period Px.
  • the wall voltage is adjusted to a suitable level.
  • the voltage 0 (V) is applied to the data electrodes D1 to Dm, and the voltage Ve is applied to the sustain electrodes SU1 to SUn.
  • a negative x-coordinate detection voltage Vax is applied to scan electrodes SC1 to SCn.
  • a positive x-coordinate detection pulse of voltage Vdx is applied to 22 and a voltage 0 (V) is applied to the data electrode 22 corresponding to the discharge cell that emits a predetermined color without applying the voltage Vdx of the x-coordinate detection pulse.
  • the first pixel column is, for example, a pixel column arranged at the left end of the image display area.
  • the voltage Vdx of the x coordinate detection pulse is applied to the data electrodes D1 and D2 corresponding to the red and green discharge cells, and the voltage is applied to the data electrode D3 corresponding to the blue discharge cell. Apply 0 (V).
  • Discharge occurs in the discharge cell array at the intersection of the data electrode 22 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 first pixel column is discharged all at once except for the discharge cell column that emits a predetermined color, and the first pixel column (in the above example, the first and second columns).
  • Discharge cell array emits light.
  • this discharge is also referred to as “x coordinate detection discharge”.
  • the light emission by the x coordinate detection discharge is light emission for x coordinate detection when the electronic pen is used.
  • the same operation is sequentially performed in the order of the second pixel column, the third pixel column,..., And the last pixel column while applying the x-coordinate detection voltage Vax to the scan electrodes SC1 to SCn. .
  • x-coordinate detection discharge is sequentially generated in each pixel column from the leftmost pixel column to the rightmost pixel column of the panel 10 except for the discharge cell column emitting a predetermined color.
  • the color of light emitted by the x-coordinate detection discharge is a complementary color of a predetermined color. For example, if the predetermined color is blue, the color of light emitted by the x-coordinate detection discharge is yellow, which is a mixture of red and green.
  • the pixel columns from the first column to the last column are excluded except for the discharge cell columns that emit a predetermined color.
  • X coordinate detection discharges are sequentially generated.
  • a light emission pattern in which one vertical line that emits light of a predetermined complementary color (for example, yellow) sequentially moves pixel by pixel from the left end to the right end of the image display area of the panel 10 is displayed on the panel 10. Is done.
  • this light emission pattern is referred to as an “x coordinate detection pattern”.
  • one light emission line extending in the y coordinate direction generated in the x coordinate detection period Px is also referred to as a “second light emission line”.
  • the timing at which the electronic pen receives the light emitted from the second light emission line varies depending on where the position coordinate of the electronic pen is in the image display area of the panel 10.
  • the time for applying the voltage Vax of the x coordinate detection pulse to each of the data electrodes 22 is Tx1.
  • This Tx1 is about 1 ⁇ sec, for example.
  • the voltage 0 (V) to the positive voltage Vr is applied to the scan electrodes SC1 to SCn while the voltage 0 (V) is applied to the sustain electrodes SU1 to SUn and the data electrodes D1 to Dm. Apply an upward ramp waveform voltage that rises slowly until
  • the data electrodes D1 to Dm may be in a high impedance state as shown in FIG. 4, or may be left with the voltage 0 (V) applied.
  • the discharge cells that emit light of a predetermined color for example, blue discharge cells
  • Discharge cells for example, red and green discharge cells
  • the light emission luminance of the “first light emission line” and the “second light emission line” can be reduced to about 2/3 as compared with the conventional configuration in which all the discharge cells of three colors emit light.
  • the emission colors of the “first emission line” and the “second emission line” are complementary colors of the emission color (for example, blue) generated during the synchronization detection period Po. Accordingly, the user observes light emission in which the complementary color (for example, yellow) is superimposed on the light emission (for example, blue) generated in the synchronization detection period Po, and the light emission color generated in the period of the coordinate detection subfield approaches an achromatic color. . As a result, it is possible to make it difficult for the user to perceive light emitted in the coordinate detection subfield.
  • voltage Vc ⁇ 50 (V)
  • voltage Vr 205 (V)
  • voltage Ve 155 (V )
  • the gradient of the rising ramp waveform voltage rising to the voltage Vi2 generated in the initialization periods Pi1, Pio, Pix and the erasing period Pex of the image display subfield or coordinate detection subfield is about 1.5 (V / ⁇ sec).
  • the slope of the downward ramp waveform voltage generated in the initialization periods Pi1 to Pi8, Pio, Piy and Pix is about ⁇ 2.5 (V / ⁇ sec).
  • the gradient of the rising ramp waveform voltage that rises to the voltage Vr generated in the sustain periods Ps1 to Ps8, the synchronization detection period Po, the erasure periods Pey and Pex, and the initialization period Pix is about 10 (V / ⁇ sec).
  • each voltage value and the gradient described above is merely examples, and it is desirable that each voltage value and the gradient is optimally set based on the discharge characteristics of the panel 10 and the specifications of the image display device. .
  • FIG. 5 is a diagram schematically illustrating a configuration example of the image display system 100 according to the first embodiment of the present disclosure.
  • the image display system 100 shown in the present embodiment includes an image display device 30, a drawing device 40, and a plurality of electronic pens 50a, 50b, 50c, and 50d as components, and drawing with the electronic pens 50a, 50b, 50c, and 50d.
  • Wireless communication is performed with the device 40.
  • the number of electronic pens 50 included in the image display system 100 is not limited to four, and may be five or more, three or less, or one.
  • the image display device 30 includes a display device that displays an image and a drive circuit that drives the display device.
  • a plasma display device having a panel 10 as a display device is used as the image display device 30 will be described.
  • the image display device 30 has a power supply for supplying necessary power to the image signal processing unit 31, the data electrode driving unit 32, the scan electrode driving unit 33, the sustain electrode driving unit 34, the control unit 35, and each circuit block as a driving circuit. Part (not shown). These drive circuits generate the drive voltage waveform described with reference to FIGS. 3 and 4 and apply it to the panel 10 to drive the panel 10.
  • the image signal processing unit 31 receives an image signal input from the outside, a drawing signal output from the drawing device 40, and a control signal supplied from the control unit 35.
  • the image signal processing unit 31 combines the image signal and the drawing signal, and based on the combined signal or one of the signals, each of the discharge cells has red, green, and blue gradation values (one field). (Gradation value expressed by), and each gradation value is image data indicating lighting / non-lighting for each subfield (data in which light emission / non-light emission corresponds to digital signals “1” and “0”) To output.
  • the image signal processing unit 31 separates the horizontal synchronization signal and the vertical synchronization signal from the signal transmitted as the image signal, and outputs the horizontal synchronization signal and the vertical synchronization signal to the control unit 35.
  • the control unit 35 generates various control signals for controlling the operation of each circuit block based on the horizontal synchronization signal and the vertical synchronization signal, and generates the generated control signal in each circuit block (data electrode drive unit 32, scan electrode drive unit). 33, sustain electrode drive unit 34, and image signal processing unit 31).
  • the data electrode drive unit 32 generates the drive voltage waveforms shown in FIGS. 3 and 4 based on the image data output from the image signal processing unit 31 and the control signal supplied from the control unit 35, and each data electrode D1 ⁇ Apply to Dm.
  • the sustain electrode driver 34 generates the drive voltage waveform shown in FIGS. 3 and 4 based on the control signal supplied from the controller 35 and applies it to the sustain electrodes SU1 to SUn.
  • the scan electrode drive unit 33 generates the drive voltage waveforms shown in FIGS. 3 and 4 based on the control signal supplied from the control unit 35 and applies the drive voltage waveforms to the scan electrodes SC1 to SCn.
  • the electronic pen 50 is formed in a rod shape, and the user directly touches the front end of the electronic pen 50 to the panel 10 and inputs characters, drawings, and the like in the image display area of the image display device 30 by handwriting. used.
  • the electronic pen 50 detects the position coordinates by receiving light emitted from the panel 10 by the coordinate detection subfield. As described above, as for the position coordinates, the electronic pen 50 receives the light emission of the y coordinate detection pattern displayed on the panel 10 to calculate the y coordinate, and receives the light emission of the x coordinate detection pattern displayed on the panel 10. Then, it is detected by calculating the x coordinate.
  • the electronic pen 50 includes a light receiving element 52, a contact switch 53, a synchronization detection unit 54, a coordinate calculation unit 56, and a transmission unit 58.
  • the electronic pen 50 also has a power switch, a pilot lamp, and the like.
  • the power switch is a switch for controlling the power on / off of the electronic pen 50.
  • the pilot lamp is composed of a light emitting element (for example, LED) that can emit light by switching a plurality of light emission colors, and displays the operation state of the electronic pen 50 by switching light emission / non-light emission or light emission color.
  • the contact switch 53 is provided at the tip of the electronic pen 50 on the side where the light receiving element 52 is attached, and detects whether the tip of the electronic pen 50 is in contact with the image display surface of the panel 10.
  • the electronic pen 50 may be configured to include a manual switch (not shown) instead of the contact switch 53.
  • the user can input characters and drawings on the image display surface by handwriting by using the electronic pen 50 located away from the image display surface by operating the manual switch.
  • the electronic pen 50 may include both the contact switch 53 and the manual switch, and the single electronic pen 50 may be configured to be used in two ways of contact and non-contact. Or you may comprise so that a user can switch arbitrarily drawing modes (For example, the color of the line used for drawing, the thickness of a line, the kind of line, etc.) by operating a manual switch.
  • the light receiving element 52 receives light emitted from the image display surface of the panel 10 and converts it into an electric signal (light receiving signal). Then, the light reception signal is output to the synchronization detection unit 54 and the coordinate calculation unit 56.
  • the position coordinate (x, y) of the electronic pen 50 is a position where the light receiving element 52 receives light emitted from the image display surface of the panel 10.
  • the synchronization detection unit 54 detects light emission for synchronization detection (light emission generated by the synchronization detection discharge) generated in the synchronization detection period Po of the synchronization detection subfield SFo based on the light reception signal output from the light receiving element 52. Specifically, the synchronization detection unit 54 measures a generation interval of a plurality of (for example, four times) emission using a timer (not shown) included in the synchronization detection unit 54. Then, whether or not the occurrence interval matches a predetermined time interval (for example, time To1, time To2, time To3) is determined based on a plurality of threshold values (for example, time This is determined by comparing the measured time intervals with threshold values corresponding to To1, time To2, and time To3.
  • a predetermined time interval for example, time To1, time To2, time To3
  • the synchronization detection unit 54 compares the light reception signal with a preset light reception threshold value (not shown), calculates a differential value for the light reception signal equal to or higher than the light reception threshold value, and generates a local peak. The time that occurs is detected and each time is detected. Further, a time difference between the time when the voltage for generating the discharge is applied to the discharge cell and the time when the discharge actually occurs and the peak of light emission is detected by the electronic pen 50 is measured in advance, and the time difference is measured at each time. You may use for correction of.
  • the synchronization detection unit 54 creates a coordinate reference signal based on one of the continuous multiple times (for example, four times) of light emission (for example, light emission generated at time to1).
  • the time to1 is the time when the first synchronization detection pulse V1 is applied to the scan electrodes SC1 to SCn in the synchronization detection period Po of the synchronization detection subfield SFo.
  • 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).
  • the coordinate calculation unit 56 Based on the coordinate reference signal and the light reception signal, the coordinate calculation unit 56 selectively extracts, from the light reception signal, 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, and outputs the electrons in the image display area.
  • the position coordinates (x, y) of the pen 50 are calculated. Then, the calculated position coordinates (x, y) of the electronic pen 50 are output to the transmission unit 58.
  • the transmission unit 58 outputs a transmission signal based on the light reception signal output from the light receiving element 52.
  • the transmission unit 58 includes a transmission circuit (not shown) that encodes an electrical signal, converts the encoded signal into a wireless signal such as infrared rays, and transmits the signal. Then, a unique identification number (ID) assigned to each electronic pen 50, a signal indicating the position coordinates (x, y) of the electronic pen 50 calculated by the coordinate calculation unit 56, the state S1 of the contact switch 53, etc. Is encoded and converted to a radio signal. This radio signal is a transmission signal.
  • the wireless signal is wirelessly transmitted to the receiving unit 42 of the drawing apparatus 40.
  • the drawing apparatus 40 includes a receiving unit 42 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 electronic pen 50 and outputs the drawing signal to the image display device 30.
  • This drawing signal is a signal for displaying on the panel 10 an image handwritten by the user using the electronic pen 50, and is substantially the same as the image signal.
  • the receiving unit 42 has a conversion circuit (not shown) that receives a radio signal wirelessly transmitted from the transmission unit 58 of the electronic pen 50, decodes the received signal, and converts it into an electrical signal. Then, the wireless signal wirelessly transmitted from the transmitter 58 is converted into an identification number (ID) of the electronic pen 50, a signal representing the position coordinates (x, y) of the electronic pen 50, and a signal S1 representing the state of the contact switch 53. And output to the drawing unit 46.
  • ID identification number
  • S1 representing the state of the contact switch 53.
  • the drawing unit 46 distinguishes the position coordinates (x, y) from each other so that the traces of the electronic pens 50 are not confused with each other.
  • each circuit block operates based on a control signal supplied from the control unit 35, but details of the path of the control signal are omitted in each drawing.
  • FIG. 6 is a circuit diagram schematically illustrating a configuration example of the sustain electrode driving unit 34 of the image display device 30 according to the first embodiment of the present disclosure.
  • the sustain electrode driving unit 34 includes a sustain pulse generation circuit 80 and a constant voltage generation circuit 85.
  • Sustain pulse generation circuit 80 includes a power recovery circuit 81 and switching elements Q83 and Q84.
  • the power recovery circuit 81 includes a power recovery capacitor C20, switching elements Q21 and Q22, backflow prevention diodes Di21 and Di22, and resonance inductors L21 and L22.
  • the sustain pulse generation circuit 80 generates a sustain pulse of the voltage Vs at the timing shown in FIGS. 3 and 4 and applies it to the sustain electrodes SU1 to SUn.
  • the synchronization detection pulses V2 and V4 are applied to the sustain electrodes SU1 to SUn.
  • the constant voltage generation circuit 85 has switching elements Q86 and Q87, and applies the voltage Ve to the sustain electrodes SU1 to SUn at the timings shown in FIGS.
  • FIG. 7 is a circuit diagram schematically illustrating a configuration example of the data electrode driving unit 32 of the image display device 30 according to the first embodiment of the present disclosure.
  • the data electrode driving unit 32 operates based on the image data and control signals supplied from the image signal processing unit 31, but details of the paths of these signals are omitted in FIG.
  • FIG. 8 is a circuit diagram schematically illustrating a configuration example of the scan electrode driving unit 33 of the image display device 30 according to the first embodiment of the present disclosure.
  • the scan electrode driving unit 33 includes a sustain pulse generation circuit 55, a ramp waveform voltage generation circuit 60, and a scan pulse generation circuit 70.
  • the voltage input to the scan pulse generation circuit 70 is referred to as “reference potential A”.
  • Sustain pulse generation circuit 55 includes power recovery circuit 51 and switching elements Q55, Q56, and Q59.
  • the power recovery circuit 51 includes a power recovery capacitor C10, switching elements Q11 and Q12, backflow prevention diodes Di11 and Di12, and resonance inductors L11 and L12.
  • the switching element Q59 is a separation switch, and prevents reverse current flow.
  • sustain pulse generating circuit 55 generates a sustain pulse of voltage Vs at the timing shown in FIGS. 3 and 4 and applies it to scan electrodes SC1 to SCn via scan pulse generating circuit. Further, in the synchronization detection period Po of the synchronization detection subfield SFo, synchronization detection pulses V1 and V3 are generated and applied to the scan electrodes SC1 to SCn via the scan pulse generation circuit 70.
  • the ramp waveform voltage generation circuit 60 includes Miller integration circuits 61, 62, and 63, generates the ramp waveform voltage shown in FIGS. 3 and 4, and applies it to the scan electrodes SC1 to SCn via the scan pulse generation circuit. .
  • each voltage may be set so that a voltage obtained by superimposing the voltage Vp on the voltage Vt is equal to the voltage Vi2.
  • Miller integrating circuit 62 includes transistor Q62, capacitor C62, resistor R62, and backflow preventing diode Di62, and generates an upward ramp waveform voltage that gradually rises toward voltage Vr.
  • Miller integrating circuit 63 includes transistor Q63, capacitor C63, and resistor R63, and generates a downward ramp waveform voltage that gradually falls toward voltage Vi4.
  • Switching element Q69 is a separation switch and prevents reverse current flow.
  • the scan pulse generating circuit 70 includes switching elements QH1 to QHn, QL1 to QLn, Q72, a power source that generates a negative voltage Va, and a power source E71 that generates a voltage Vp.
  • Switching elements QL1 to QLn apply reference potential A to scan electrodes SC1 to SCn, and switching elements QH1 to QHn apply a voltage obtained by superimposing reference voltage A on voltage Vp to scan electrodes SC1 to SCn.
  • the scan pulse generation circuit 70 generates a scan pulse at the timing shown in FIG. 3 and sequentially applies it to each of the scan electrodes SC1 to SCn in each address period of the image display subfield.
  • a plurality of pairs of switching elements QHi and switching elements QLi are integrated in one IC (scan driver IC).
  • FIG. 9 is a diagram schematically illustrating an example of the position coordinate detection operation when the electronic pen 50 is used in the image display system 100 according to the first embodiment of the present disclosure.
  • FIG. 9 shows a coordinate reference signal det input to the coordinate calculation unit 56 and a light reception signal output from the light receiving element 52 in addition to the drive voltage waveform.
  • the drive voltage waveform shown in FIG. 9 is the same as the drive voltage waveform shown in FIG.
  • a period Toy from time to1 to time ty0 (time when the y coordinate detection period Py starts) and from time to1 to time tx0 (time when the x coordinate detection period Px starts).
  • the period Tox is predetermined. Therefore, the synchronization detection unit 54 detects the four consecutive light emission intervals of the light emission intervals of time To1, time To2, and time To3, specifies time to1, and sets time ty0 and time based on time to1.
  • a coordinate reference signal det having a rising edge at each of tx0 is generated and output to the subsequent coordinate calculation unit 56.
  • the coordinate reference signal det is not limited to the time to1, but may be generated based on any of the times to2, to3, and to4.
  • FIG. 10 is a diagram schematically illustrating an example of an operation when the electronic pen 50 is used in the image display system 100 according to the first embodiment of the present disclosure.
  • FIG. 11 is a diagram schematically illustrating an example of an operation when performing handwritten input with the electronic pen 50 in the image display system 100 according to the first embodiment of the present disclosure.
  • the first light emission line Ly that sequentially moves from the upper end (first row) to the lower end (n-th row) of the image display area. Is displayed on the panel 10.
  • a second shift sequentially moves from the left end (first pixel column) to the right end (m / 3 pixel column) of the image display area.
  • the light emission line Lx is displayed on the panel 10.
  • the light receiving element 52 of the electronic pen 50 receives the light emission of “coordinate (x, y)” on the image display surface of the panel 10, the time tyy when the first light emission line Ly passes the coordinate (x, y). Then, at the time txx when the second light emitting line Lx passes the coordinates (x, y), the light receiving element 52 receives light emission.
  • the light receiving element 52 outputs a light reception signal indicating that the light emission of the first light emission line Ly is received at the time tyy, and receives the light emission of the second light emission line Lx.
  • a light reception signal indicating this is output at time txx.
  • the drawing unit 46 draws a drawing pattern (for example, a pattern such as a white circle) having a color and a size corresponding to the drawing mode around the pixel corresponding to the position coordinate (x, y). Generate a drawing signal.
  • the panel 10 displays a graphic input by handwriting using the electronic pen 50.
  • the address pulse is applied only to the data electrode 22 of the discharge cell that emits a predetermined color (for example, blue) in the address period Pwo of the synchronization detection subfield SFo.
  • the address discharge is generated only in the discharge cells that emit light of a predetermined color (for example, blue).
  • the number of discharge cells in which the synchronous detection discharge is generated in the synchronous detection period Po is 1/3 of the total discharge cells, which is associated with the synchronous detection discharge as compared with the conventional technique in which the synchronous detection discharge is generated in all the discharge cells.
  • the luminance of emitted light can be reduced to about 1/3. Therefore, the luminance of black can be reduced and the contrast of the panel 10 can be improved.
  • the discharge cells for example, red and green discharge cells
  • the discharge cells excluding the discharge cells that have generated the synchronous detection discharge are caused to emit light.
  • the emission luminance of the “second emission line” and the “second emission line” can be reduced to about 2/3 as compared with the conventional configuration in which discharge cells of all three colors emit light.
  • the emission colors of the “first emission line” and the “second emission line” are complementary colors of the emission color (for example, blue) generated in the synchronization detection period Po, the emission generated during the coordinate detection subfield period. Can be made closer to an achromatic color to make it difficult for the user to perceive.
  • the y-coordinate detection discharge and the x-coordinate detection discharge are discharges similar to the address discharge and are weaker than the sustain discharge, and the light emission luminance is relatively low.
  • the synchronous detection discharge that emits light of a predetermined color is a relatively strong discharge similar to the sustain discharge, and the light emission luminance is also relatively high. Therefore, it is desirable that both the “first light emission line” and the “second light emission line” emit light with a complementary color of a predetermined color.
  • the present embodiment is not limited to this configuration. For example, only one of them may emit light with a complementary color of a predetermined color, and the other may emit a predetermined color or all three colors.
  • FIG. 12 is a diagram schematically illustrating an example of a drive voltage waveform applied to each electrode of the panel 10 in the coordinate detection sub-field according to the second embodiment of the present disclosure.
  • the synchronization detection subfield SFo2 has an initialization period Pio, a writing period Pwo2, and a synchronization detection period Po2.
  • the initialization period Pio shown in FIG. 12 has the same configuration and operation as the initialization period Pio of the synchronization detection subfield SFo shown in the first embodiment, description thereof is omitted.
  • the operation is substantially the same as the write period Pwo of the synchronization detection subfield SFo shown in the first embodiment.
  • the scan electrode 12 to which the scan pulse is applied is different from the address period Pwo shown in the first embodiment.
  • the data electrode 22 (for example, the data electrodes D3 and D6) corresponding to the discharge cells that emit a predetermined color (for example, blue) determined in advance. , D9,..., Dm), the voltage Vd address pulse is applied to the other data electrodes 22 (eg, data electrodes D1, D2, D4, D5,... Corresponding to the red and green discharge cells). , Dm-2, Dm-1), a voltage 0 (V) is applied without applying an address pulse.
  • the scan electrode 12 to which the scan pulse of the voltage Va is applied is a specific scan electrode 12 determined for each field, unlike the address period Pwo shown in the first embodiment.
  • a voltage Vc is applied to the other scan electrodes 12 without applying a scan pulse. That is, in the address period Pwo2, the address discharge is generated only in the discharge cells (hereinafter referred to as “specific discharge cells”) that emit light of a predetermined color and have specific scan electrodes 12 determined for each field.
  • the specific scanning electrode 12 is set based on the following rules.
  • N fields that are temporally continuous are defined as one field group, and N scanning electrodes 12 that are continuously disposed are defined as one scanning electrode group.
  • the scan electrodes 12 and the discharge cell rows are arranged in the order of the first row, the second row,... From the upper end of the image display area.
  • the horizontal direction represents the passage of time in field units
  • the vertical direction represents the scanning electrodes 12.
  • N 2 fields (for example, fields Fj and Fj + 1) arranged in time form one field group, and two scanning electrodes 12 (for example, adjacently arranged) , Scan electrodes SCi, SCi + 1) constitute one scan electrode group.
  • the scan electrode 12 to which the scan pulse voltage Va is applied in the address period Pwo2 is indicated by “ ⁇ ”, and the scan electrode 12 to which the scan pulse voltage Va is not applied is indicated by “x”.
  • fields Fj, Fj + 2, Fj + 4,... are odd-numbered fields, and fields Fj + 1, Fj + 3, Fj + 5,.
  • scan electrodes SC1, SC3,..., SCi ⁇ 1 are set as scan electrodes 12 in odd rows, and scan electrodes SC2, SC4,..., SCi + 1,.
  • the scanning electrode 12 is in the row.
  • the scan pulse voltage Va is applied to the odd-numbered scan electrodes 12 in the write period Pwo2 of the synchronization detection subfield SFo2, and the even-numbered scan electrodes 12 are applied to the even-numbered scan electrodes 12.
  • the voltage Vc is applied without applying the scan pulse voltage Va.
  • the voltage Vc is applied to the odd-numbered scan electrodes 12 without applying the scan pulse voltage Va, and the even-numbered scan electrodes 12 are applied.
  • the voltage Va of the scan pulse is applied to.
  • the number of discharge cells that generate an address discharge in one address period Pwo2 is half that of the discharge cells that emit a predetermined color. This is 1/6 of all the discharge cells, and half of the discharge cells in which the address discharge is generated in the address period Pwo shown in the first embodiment.
  • the luminance of light emission caused by the synchronous detection discharge can be further reduced as compared with the light emission generated in the synchronous detection subfield SFo shown in the first embodiment.
  • the scan pulse voltage Va is applied to the scan electrodes SC1, SC3, SC5,..., SCn ⁇ 1 in the odd rows, and the scan electrodes SC2, SC4, SC in the even rows.
  • SCn shows an example in which a voltage Vc is applied without applying a scanning pulse.
  • the voltage Va of the scan pulse may be simultaneously applied to the specific scan electrode 12 to generate address discharges simultaneously in specific discharge cells that emit a predetermined color.
  • the time required for the writing period Pwo2 can be shortened.
  • scanning pulses may be sequentially applied from the scanning electrodes 12 arranged at the upper end portion of the image display area (not shown).
  • the time to0 is the time when the voltage Va of the scan pulse for generating the last address discharge is applied to the scan electrode SCn-1 in the odd-numbered field, and the last address discharge is applied in the even-numbered field. This is the time when the voltage Va of the scan pulse to be generated is applied to the scan electrode SCn.
  • the synchronization detection period Po2 shown in FIG. 12 has the same configuration and operation as the synchronization detection period Po shown in the first embodiment, detailed description thereof is omitted.
  • the configuration in which the synchronous detection discharge is generated four times in the discharge cells emitting a predetermined color (for example, blue) in the synchronous detection period Po has been described.
  • the synchronous detection in FIG. As shown in the period Po2, the number of occurrences of the synchronous detection discharge may be set to two.
  • the time To0 is set to a time longer than the time To1, for example, the time To0 is set to about 50 ⁇ sec and the time To1 is set to about 40 ⁇ sec.
  • the number of occurrences of the synchronous detection discharge is not limited to the number described above, and is desirably set optimally according to the specifications of the image display system.
  • the number of occurrences of the synchronous detection discharge is reduced, the luminance of light emission generated during the synchronous detection period is lowered, so that the contrast of the panel 10 can be further improved.
  • the number of occurrences of the synchronous detection discharge is desirably set optimally in consideration of the detection accuracy of the position coordinates in the electronic pen 50 and the contrast of the panel 10.
  • the y-coordinate detection subfield SFy and the x-coordinate detection subfield SFx shown in FIG. 12 have the same configuration and operation as the y-coordinate detection subfield SFy and the x-coordinate detection subfield SFx shown in the first embodiment. Omitted.
  • the address pulse is applied only to the data electrode 22 of the discharge cell that emits a predetermined color (for example, blue) in the address period Pwo2 of the synchronization detection subfield SFo2, and each field A scan pulse is applied only to the specific scan electrode 12 defined in (1).
  • a predetermined color for example, blue
  • each field A scan pulse is applied only to the specific scan electrode 12 defined in (1).
  • the predetermined color may be red or green.
  • the time intervals when the synchronous detection discharge is generated a plurality of times at different times so that the first synchronous detection discharge can be easily specified.
  • each coordinate detection subfield may be generated at a rate of once in a plurality of fields, for example.
  • a plurality of pixel rows when displaying the y-coordinate detection pattern, a plurality of pixel rows may be caused to emit light simultaneously, or pixel rows that are not allowed to emit light may be provided.
  • a plurality of pixel columns when displaying an x-coordinate detection pattern, a plurality of pixel columns may emit light simultaneously, or pixel columns that do not emit light may be provided.
  • each coordinate detection subfield is not limited to the order of occurrence described above.
  • the x coordinate detection subfield may be generated first, and then the y coordinate detection subfield may be generated.
  • the configuration in which the drawing device is provided independently of the image display device is shown.
  • a function connected to the computer connected to the image display device is equivalent to the drawing device.
  • a drawing signal is generated using the computer.
  • the drawing device may be provided as a single device, or the drawing device may be provided in the image display device.
  • the signal switching unit may be provided in the image display device.
  • Each circuit block shown in the first and second embodiments 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.
  • This disclosure is useful as an image display device, an image display device driving method, and an image display system because light emission for coordinate detection can be generated while suppressing a decrease in contrast.

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

Abstract

La présente invention concerne un dispositif d'affichage d'image comprenant un panneau d'affichage par plasma possédant une cellule de décharge formée à chaque intersection d'une électrode de balayage et d'une électrode d'entretien avec une électrode de données et générant un sous-champ d'affichage d'image et un sous-champ de détection de synchronisation qui est utilisé pour générer une décharge électrique de calcul de coordonnées de position, ledit dispositif d'affichage d'image étant conçu de sorte que de la lumière générée par la décharge de détection de synchronisation est émise avec une dégradation de contraste minimisée. Pour ce faire, lors d'une période d'écriture dans un sous-champ de détection de synchronisation, une impulsion d'écriture n'est appliquée qu'aux électrodes de données de cellules de décharge qui émettent une couleur spécifique qui est déterminée à l'avance, ce qui amène à ne générer la décharge d'écriture qu'au niveau des cellules de décharge qui émettent cette couleur spécifique.
PCT/JP2013/004092 2012-07-03 2013-07-02 Dispositif d'affichage d'image, procédé d'attaque de dispositif d'affichage d'image et système d'affichage d'image WO2014006880A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08115057A (ja) * 1994-10-14 1996-05-07 Pioneer Electron Corp 平面表示装置の駆動方法
JP2006267526A (ja) * 2005-03-24 2006-10-05 Pioneer Electronic Corp プラズマディスプレイパネルの駆動方法
WO2013084375A1 (fr) * 2011-12-07 2013-06-13 パナソニック株式会社 Procédé de commande de dispositif d'affichage d'image, dispositif d'affichage d'image et système d'affichage d'image

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08115057A (ja) * 1994-10-14 1996-05-07 Pioneer Electron Corp 平面表示装置の駆動方法
JP2006267526A (ja) * 2005-03-24 2006-10-05 Pioneer Electronic Corp プラズマディスプレイパネルの駆動方法
WO2013084375A1 (fr) * 2011-12-07 2013-06-13 パナソニック株式会社 Procédé de commande de dispositif d'affichage d'image, dispositif d'affichage d'image et système d'affichage d'image

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