WO2013183264A1 - Dispositif d'affichage d'image, procédé de commande de dispositif d'affichage d'image et système d'affichage d'image - Google Patents

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

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Publication number
WO2013183264A1
WO2013183264A1 PCT/JP2013/003437 JP2013003437W WO2013183264A1 WO 2013183264 A1 WO2013183264 A1 WO 2013183264A1 JP 2013003437 W JP2013003437 W JP 2013003437W WO 2013183264 A1 WO2013183264 A1 WO 2013183264A1
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WIPO (PCT)
Prior art keywords
scan
image display
discharge
voltage
period
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Application number
PCT/JP2013/003437
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English (en)
Japanese (ja)
Inventor
英幸 野口
秀彦 庄司
裕也 塩崎
一朗 坂田
貴彦 折口
智充 増田
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from JP2012129562A external-priority patent/JP2015155931A/ja
Priority claimed from JP2012129561A external-priority patent/JP2015155930A/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 WO2013183264A1 publication Critical patent/WO2013183264A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/037—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor using the raster scan of a cathode-ray tube [CRT] for detecting the position of the member, e.g. light pens cooperating with CRT monitors
    • 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
    • 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
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0205—Simultaneous scanning of several lines in flat panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • 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 that can input characters and drawings using a light pen, a driving method of the image display device, and an image display system.
  • a typical example of an image display device that displays an image in an image display region by combining light emission and non-light emission binary control in each light emitting element is a plasma display panel (hereinafter abbreviated as “panel”).
  • each discharge cell In the panel, 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, and each discharge cell has red (R), green (G), and blue color.
  • R red
  • G green
  • B One of the phosphors of (B) is applied and a discharge gas is enclosed.
  • Each discharge cell emits a phosphor by causing discharge.
  • the subfield method is generally used as a method for displaying an image in the image display area of the panel.
  • one field is divided into a plurality of subfields having different emission luminances.
  • light emission / non-light emission of each subfield is controlled by a combination according to the gradation value to be displayed.
  • 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.
  • black brightness the brightness of the discharge cell that displays black
  • 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.
  • 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.
  • 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.
  • a plurality of discharge cells formed in a region where a scan electrode extended in a row direction and a data electrode extended in a column direction intersect with each other constitute an image display region. It is a drive method of an image display apparatus provided with an image display part. An address period in which 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 timing in which a timing detection discharge is generated in the discharge cell that has generated the address discharge in the address period A timing detection subfield having a detection period is generated to drive the image display unit, and a scan pulse is simultaneously applied to the plurality of scan electrodes in the write period of the timing detection subfield.
  • a plurality of scan electrodes arranged in succession is set as one scan electrode group, and a scan pulse is applied in the write period of the timing detection subfield in one field. May be one scan electrode in each scan electrode group.
  • a plurality of temporally continuous fields are set as one field group, and a scan pulse is applied to one scan electrode during the writing period of the timing detection subfield. May be once in one field group.
  • An image display device includes an image display unit configured by arranging a plurality of discharge cells formed in a region where a scan electrode extended in a row direction and a data electrode extended in a column direction intersect. And an address period in which 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 timing in which a timing detection discharge is generated in the discharge cell in which the address discharge is generated in the address period. And a drive circuit for generating a timing detection subfield having a detection period and driving the image display unit.
  • the drive circuit includes a plurality of scan driver ICs connected to the plurality of scan electrodes, and applies a scan pulse to the plurality of scan electrodes simultaneously in the writing period of the timing detection subfield.
  • An image display system includes an image display unit configured by arranging a plurality of discharge cells formed in a region where a scan electrode extended in a row direction and a data electrode extended in a column direction intersect. And an address period in which 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 timing in which a timing detection discharge is generated in the discharge cell in which the address discharge is generated in the address period.
  • An image display device including a drive circuit that generates a timing detection subfield having a detection period and drives an image display unit, and a light pen having a light receiving element.
  • the drive circuit uses a plurality of adjacent scan electrodes as one scan electrode group, and in one field, the number of scan electrodes to which the scan pulse is applied in the timing detection subfield writing period is equal to each scan electrode group. Let's assume one.
  • the light pen receives light emitted in the image display area of the image display device in the timing detection subfield and generates a reference signal for calculating position coordinates.
  • FIG. 1 is an exploded perspective view illustrating an example of a panel used in the image display apparatus according to Embodiment 1 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 subfields SF1 to SF3 of 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. 1 is an exploded perspective view illustrating an example of a panel used in the image display apparatus according to Embodiment 1 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
  • FIG. 6 is a diagram schematically illustrating a configuration example of the image display system according to the first embodiment of the present disclosure.
  • FIG. 7 is a circuit diagram schematically illustrating a configuration example of the sustain electrode driving circuit 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 data electrode driving circuit of the image display device according to the first embodiment of the present disclosure.
  • FIG. 9 is a circuit diagram schematically illustrating a configuration example of the scan electrode driving circuit of the image display device according to the first embodiment of the present disclosure.
  • FIG. 10 is a diagram schematically illustrating an example of a drive voltage waveform applied to the scan electrode in the timing detection subfield SFo according to the first embodiment of the present disclosure.
  • FIG. 11 is a diagram schematically illustrating an example of a position coordinate detection operation when a light pen is used in the image display system according to the first embodiment of the present disclosure.
  • FIG. 12 is a diagram schematically illustrating an example of an operation when the light pen is used in the image display system according to the first embodiment of the present disclosure.
  • FIG. 13 is a diagram schematically illustrating an example of an operation when performing handwriting input with a light pen in the image display system according to Embodiment 1 of the present disclosure.
  • FIG. 15 is a diagram schematically illustrating an example of a drive voltage waveform applied to the scan electrode in the timing detection subfield SFo according to the second embodiment of the present disclosure.
  • an image display system including, as an example, an image display device including a plasma display panel (hereinafter abbreviated as “panel”) as an image display unit will be described.
  • panel a plasma display panel
  • FIG. 1 is an exploded perspective view illustrating an example of a 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 partitioned into a plurality of sections by the barrier ribs 24, and discharge cells, which are light-emitting elements constituting the pixels, 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) light (hereinafter referred to as “red discharge cell”) and a phosphor layer 25G having a green color (G).
  • red discharge cell a discharge cell having a phosphor layer 25R and emitting red (R) light
  • green discharge cell A discharge cell that emits light
  • B blue discharge cell
  • 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.
  • an image display subfield for displaying an image on panel 10 and a coordinate detection subfield (FIG. 4) for detecting the “positional coordinates” of the light pen.
  • the “positional coordinates” are the coordinates of the position pointed to by the light pen in the image display area of the panel 10 (coordinates indicating the position of the light 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 subfields SF1 to SF3 of 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. After applying voltage 0 (V) to scan electrodes SC1 to SCn, 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 timing detection subfield SFo, a y coordinate detection subfield SFy, and an x coordinate detection subfield SFx.
  • the position pointed to by the light pen in the image display area (hereinafter also referred to as “light pen position”) is represented by an x-coordinate and a y-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 light pen is provided in the image display system of the present embodiment, and is used by a user to input characters and drawings on the panel by handwriting. Details of the light pen will be described later.
  • the position (positional coordinate) pointed to by the light pen is a light-receiving element of the light pen, which will be described later, is 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. This is the position in the image display surface where the light emission of the y coordinate detection pattern is detected.
  • wireless communication is performed between the light pen and a drawing apparatus described later.
  • 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 is a subfield for the light pen to accurately grasp the timing at which the coordinate detection subfield is generated in the image display device.
  • the light pen receives light emitted in the timing detection subfield SFo to generate a signal (coordinate reference signal) serving as a reference for calculating position coordinates with high accuracy in synchronization 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 timing detection subfield SFo in FIG. 4 has an initialization period Pio, a writing period Pwo, and a timing 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.
  • the voltage 0 (V) may be kept applied to the data electrodes D1 to Dm as in the initialization period Pi1.
  • sustain electrodes SU1 to SUn when applying a downward ramp voltage to scan electrodes SC1 to SCn, sustain electrodes SU1 to SUn may be in a high impedance state after voltage Ve is applied, or voltage Ve is applied. 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
  • the voltage Vc is applied to the scan electrodes SC1 to SCn.
  • a positive polarity write pulse with a voltage Vd is applied to the data electrodes D1 to Dm, and a negative polarity scan pulse with a voltage Va is applied to a specific scan electrode 12 determined for each field.
  • a voltage Vc is applied to 12 without applying a scan pulse. 4 shows an example in which the voltage Va of the scan pulse is applied to the scan electrodes SC1, SC3, SC5,.
  • an address discharge is generated in a discharge cell having a specific scan electrode 12 defined for each field (hereinafter referred to as “specific discharge cell”).
  • 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.
  • N scanning electrodes 12 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 is applied is indicated by “ ⁇ ”, and the scan electrode 12 to which the scan pulse 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 scan electrodes 12 in the odd-numbered rows and the scan electrodes 12 in the even-numbered rows in the write period Pwo of the timing detection subfield SFo.
  • the voltage Vc is applied without applying the scan pulse voltage Va.
  • the voltage Vc is applied to the scan electrodes 12 in the odd-numbered rows without applying the voltage Va of the scan pulse, and the scan electrodes 12 in the even-numbered rows.
  • the voltage Va of the scan pulse is applied to.
  • the number of discharge cells that generate the address discharge in one address period Pwo is half of all the discharge cells in the image display area of the panel 10.
  • the order in which the scan pulse is applied to the specific scan electrode 12 is set based on the scan driver IC described later. Details of this operation will be described later.
  • 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 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. Time to0 is the time when the scan pulse for generating the last address discharge in the address period Pwo is applied to the scan electrode 12.
  • the time to0 is the time when the scan pulse for generating the last address discharge is applied to the scan electrode SCn-1.
  • time to0 is the time when the scan pulse for generating the last address discharge is applied to scan electrode SCn.
  • a plurality of times of light emission (light emission for timing detection), which serves as a reference when calculating the position coordinates of the light pen, is generated in a specific discharge cell of the panel 10.
  • timing detection discharges are generated in a specific discharge cell in the image display area of the panel 10, and the image display surface of the panel 10 emits light four times. In other words, “light emission for timing detection occurs four times on the panel 10”.
  • timing detection discharge is performed on specific discharge cells in the image display area of the panel 10 at predetermined time intervals (for example, time To1, time To2, and time To3).
  • a plurality of times (for example, four times) are generated, and light emission for timing detection is generated a plurality of times (for example, four times).
  • this timing detection discharge is the same discharge as 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 specific discharge cells in which the timing detection discharge is generated are scattered over the entire image display surface of the panel 10 and change for each field. Thereby, generation
  • the light pen receives a plurality of times (for example, four times) of light emission for timing detection generated at predetermined time intervals (for example, time To1, time To2, and time To3), and receives a coordinate reference signal. (Signal serving as a reference when calculating the position coordinates (x coordinate, y coordinate) of the light pen) is created.
  • timing detection subfield SFo specific discharge cells scattered on the entire surface of the image display surface of the panel 10 shine simultaneously at the same timing, so that the light pen receives this light emission at any position in the image display area of the panel 10. Even if it does, light can be received at the same timing.
  • the time To0 is set to a time longer than any of the time To1, the time To2, and the time To3.
  • 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.
  • 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 image display system.
  • 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. . As a result, a weak erasure discharge is generated in a specific discharge cell in the image display area of the panel 10.
  • 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, 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.
  • sustain electrodes SU1 to SUn are 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 voltage to scan electrodes SC1 to SCn as shown in FIG. 4, sustain electrodes SU1 to SUn may be in a high impedance state after voltage Ve is applied, or while voltage Ve is being applied. It may be.
  • timing detection discharges occur in specific discharge cells of the panel 10, and in the initialization period Piy, weak initialization discharges occur in those discharge cells, and the wall voltage of those discharge cells is reduced.
  • the wall voltage is adjusted to be suitable for the y coordinate detection pattern display operation in the subsequent y coordinate detection period Py.
  • 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, and the scan electrodes SC1 to SCn.
  • a voltage Vc is applied to SCn.
  • Discharge occurs in the discharge cells in the first row at the intersections between the data electrodes D1 to Dm 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.
  • this discharge is also referred to as “y-coordinate detection discharge”.
  • 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.
  • the first pixel row (first discharge cell row) that is first from the upper end of the panel 10 is used. ) Emit light all at once.
  • a similar operation is sequentially performed in the order of the scan electrodes SC2, SC3, SC4,..., SCn with the y coordinate detection voltage Vdy applied to the data electrodes D1 to Dm until the discharge cell in the nth row is reached.
  • Light emission for y coordinate detection is sequentially generated in each pixel row (discharge cell row) from the second row to the nth row (for example, 1080th row).
  • one horizontal line that emits light (that is, one pixel row that emits light) is one pixel from the upper end to the lower end of the image display area of the panel 10.
  • a y-coordinate detection pattern that moves sequentially line by line is displayed.
  • each pixel row from the first row to the n-th row in the image display region sequentially emits light for each pixel row, so that the position coordinate 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. Therefore, the y coordinate of the position coordinate (x, y) of the light pen in the image display area can be detected by detecting the timing at which the light pen receives this light emission.
  • 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 during which the y coordinate detection pulse is applied to each of the scan electrodes SC1 to SCn in the y coordinate detection period Py 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.
  • the data electrodes D1 to Dm may be in a high impedance state.
  • the voltage of the data electrodes D1 to Dm gradually rises from the voltage 0 (V) as the voltage of the rising ramp waveform voltage applied to the scan electrodes SC1 to SCn increases. Therefore, the scan electrodes SC1 to SCn and the sustain electrodes SU1.
  • the discharge between SUN and SUn is stably generated, and the initialization discharge is stably generated.
  • 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
  • the voltage Ve is applied to the sustain electrodes SU1 to SUn
  • the negative x coordinate detection voltage Vax is applied to the scan electrodes SC1 to SCn.
  • 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.
  • Discharge occurs in the discharge cells in the first to third columns at the intersections between 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.
  • this discharge is also referred to as “x coordinate detection discharge”.
  • 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 from the left end of the panel 10 that is, the first, second, and third discharge cell columns
  • Similar operations are performed adjacent to each other in the order of data electrodes D4 to D6, data electrodes D7 to D9,..., Data electrodes Dm-2 to Dm, with the x coordinate detection voltage Vax 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 second column to the last column (for example, 1920 column). Generate sequentially.
  • one vertical line that emits light (that is, one pixel column that emits light) is 1 from the left end to the right end of the image display area of the panel 10.
  • An x-coordinate detection pattern that sequentially moves pixel by pixel is displayed. That is, this x-coordinate detection pattern is a pattern in which each pixel column from the first column to the last column of the image display area emits light sequentially for each pixel column.
  • each pixel column from the first column to the last column in the image display region sequentially emits light for each pixel column, so that the position coordinate 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. Therefore, the x coordinate of the position coordinate (x, y) of the light pen in the image display area can be detected by detecting the timing at which this light emission is received by the light pen.
  • the period during which the x-coordinate detection pattern is displayed on the panel 10 is very short. Therefore, the possibility that the x coordinate detection pattern is recognized by the user is low, and even if it is recognized by the user, it is only a slight change in luminance.
  • the time during which the x-coordinate detection pulse is applied to each of the data electrodes D1 to Dm in the x-coordinate detection period Px 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.
  • the voltage of the data electrodes D1 to Dm gradually rises from the voltage 0 (V) as the voltage of the rising ramp waveform voltage applied to the scan electrodes SC1 to SCn increases. Therefore, the scan electrodes SC1 to SCn and the sustain electrodes SU1. Discharge between SUN and SUn occurs stably, and erase discharge occurs stably.
  • 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 is about 1.5 (V / ⁇ sec), and the initialization periods Pi1 to Pi8, Pio,
  • the gradient of the downward ramp waveform voltage generated at Piy and Pix is about ⁇ 2.5 (V / ⁇ sec).
  • the gradient of the rising ramp waveform voltage rising to the voltage Vr generated in the sustain periods Ps1 to Ps8, the timing detection period Po, the erase 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. .
  • the time pen is set to a time longer than any of the time To1, the time To2, and the time To3 in the timing detection subfield SFo, and the light pen is generated in the writing period Pwo of the timing detection subfield Sfo. This is to prevent the light emission due to the address discharge from being erroneously recognized as the light emission due to 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.
  • FIG. 6 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 light pens 50a, 50b, 50c, and 50d as components, and drawing with the light pens 50a, 50b, 50c, and 50d.
  • Wireless communication is performed with the device 40.
  • the light pens 50a, 50b, 50c, and 50d have the same configuration, they are collectively referred to as the light pen 50 in the following description. Further, the number of light 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 display device that displays an image
  • a drive circuit that drives the display device.
  • the image display device 30 may include other display devices such as a liquid crystal panel, an organic EL panel, and an LED panel. It may be used.
  • the image display device 30 supplies necessary power to the image signal processing circuit 31, the data electrode drive circuit 32, the scan electrode drive circuit 33, the sustain electrode drive circuit 34, the timing generation circuit 35, and each circuit block as a drive circuit.
  • a power supply circuit (not shown) is provided. 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 circuit 31 receives an image signal input from the outside, 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 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 timing generation circuit 35 separates a horizontal synchronizing signal and a vertical synchronizing signal from a signal transmitted as an image signal, and generates various timing signals for controlling the operation of each circuit block based on the horizontal synchronizing signal and the vertical synchronizing signal. appear.
  • the generated timing signal is supplied to each circuit block (data electrode drive circuit 32, scan electrode drive circuit 33, sustain electrode drive circuit 34, image signal processing circuit 31, etc.).
  • the data electrode drive circuit 32 generates the drive voltage waveform described above based on the image data output from the image signal processing circuit 31 and the timing signal supplied from the timing generation circuit 35, and applies it to the data electrodes D1 to Dm. .
  • Sustain electrode drive circuit 34 includes a sustain pulse generation circuit and a circuit (not shown in FIG. 6) for generating voltage Ve, and generates the drive voltage waveform described above based on the timing signal supplied from timing generation circuit 35. The voltage is applied to each sustain electrode SU1 to SUn.
  • Scan electrode drive circuit 33 includes a ramp waveform voltage generation circuit, a sustain pulse generation circuit, and a scan pulse generation circuit (not shown in FIG. 6), and the drive voltage described above based on the timing signal supplied from timing generation circuit 35.
  • a waveform is generated and applied to each of the scan electrodes SC1 to SCn.
  • the light pen 50 is formed in a rod shape, and the user directly inputs the characters, drawings, and the like in the image display area of the image display device 30 by bringing the tip of the light pen 50 into direct contact with the panel 10. Used for.
  • the light pen 50 detects the position coordinates by receiving light emitted from the panel 10 by the coordinate detection subfield. As described above, the position coordinates are detected by the light pen 50 receiving light emission of the y coordinate detection pattern displayed on the panel 10 to calculate the y coordinate, and light emission of the x coordinate detection pattern displayed on the panel 10. Is received and the x coordinate is calculated.
  • the light pen 50 includes a light receiving element 52, a contact switch 53, a timing detection unit 54, a coordinate calculation unit 56, and a transmission unit 58.
  • the light pen 50 also has a power switch, a pilot lamp, and the like.
  • the power switch is a switch for controlling power on / off of the light 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 light pen 50 by light emission / non-light emission or switching of the light emission color.
  • the contact switch 53 is provided at the tip of the light pen 50 on the side where the light receiving element 52 is attached, and detects whether the tip of the light pen 50 is in contact with the image display surface of the panel 10.
  • the light 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 light pen 50 located away from the image display surface by operating the manual switch.
  • the light pen 50 may have both the contact switch 53 and the manual switch, and the single light pen 50 may be used in two ways, 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 timing detection unit 54 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 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 output from the light receiving element 52. Specifically, the timing detection unit 54 measures a generation interval of a plurality of (for example, five times) emission using a timer (not shown) included in the timing detection unit 54. Then, whether or not the occurrence 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 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, the time difference between the time when the voltage for generating the discharge is applied to the discharge cell and the time when the discharge is actually generated and the light emission peak is detected by the light pen 50 is measured in advance, and the time difference is measured at each time. You may use for correction of.
  • the timing detection unit 54 creates a coordinate reference signal based on one of the continuous multiple times (for example, 5 times) of light emission (for example, light emission generated at time to1).
  • 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 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 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 coordinates (x, y) of the pen 50 are calculated. Then, the calculated position coordinates (x, y) of the light pen 50 are output to the transmission unit 58.
  • timing detection unit 54 Details of operations of the timing detection unit 54 and the coordinate calculation unit 56 will be described later.
  • 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 light pen 50, a signal indicating the position coordinates (x, y) of the light pen 50 calculated by the coordinate calculation unit 56, the state S1 of the contact switch 53, and the like. 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 light 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 light pen 50, and is substantially the same as the image signal.
  • the receiving unit 42 includes a conversion circuit (not shown) that receives a radio signal wirelessly transmitted from the transmission unit 58 of the light 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 a signal S1 indicating the identification number (ID) of the light pen 50, a position coordinate (x, y) of the light pen 50, and a state of the contact switch 53. And output to the drawing unit 46.
  • a conversion circuit not shown
  • the drawing unit 46 includes an image memory 47.
  • the drawing unit 46 creates a drawing signal (for example, an image signal such as a white circle) around the pixel corresponding to the position coordinate (x, y) calculated by the coordinate calculation unit 56, and stores it in the image memory 47.
  • a drawing signal for example, an image signal such as a white circle
  • the drawing unit 46 distinguishes the position coordinates (x, y) from each other so that the trajectories of the light pens 50 are not confused with each other. The above-described operation is performed on the light pen 50.
  • the drawing unit 46 outputs the drawing signal stored in the image memory 47 to the image display device 30.
  • 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 each drawing.
  • FIG. 7 is a circuit diagram schematically illustrating a configuration example of the sustain electrode drive circuit 34 of the image display device 30 according to the first embodiment of the present disclosure.
  • the sustain electrode driving circuit 34 includes a sustain pulse generating circuit 80 and a constant voltage generating 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 timing 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. 8 is a circuit diagram schematically illustrating a configuration example of the data electrode driving circuit 32 of the image display device 30 according to the first embodiment of the present disclosure.
  • the data electrode drive circuit 32 operates based on the image data and timing signals supplied from the image signal processing circuit 31, but details of the paths of these signals are omitted in FIG.
  • FIG. 9 is a circuit diagram schematically illustrating a configuration example of the scan electrode driving circuit 33 of the image display device 30 according to the first embodiment of the present disclosure.
  • 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.
  • 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.
  • timing 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 Qn apply reference potential A to scan electrodes SC1 to SCn, and switching elements QH1 to QHn apply a voltage obtained by superimposing voltage Vp on reference potential A 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.
  • this IC is referred to as a “scan driver IC”.
  • a scan pulse is applied to the scan electrode 12 for each scan driver IC in the writing period Pwo of the timing detection subfield SFo.
  • a write operation in the write period Pwo will be described with reference to FIG.
  • n 1080, 60 pairs of switching elements QHi and QLi are integrated in one scan driver IC, and the scan pulse generation circuit 70 has 18 scan driver ICs.
  • the present embodiment is not limited to these numerical values.
  • FIG. 10 is a diagram schematically illustrating an example of a drive voltage waveform applied to the scan electrode 12 in the timing detection subfield SFo according to the first embodiment of the present disclosure.
  • FIG. 10 shows drive voltage waveforms applied to odd-numbered scan electrodes 12 (scan electrodes SC1, SC3,..., SCi,..., SCn ⁇ 1).
  • the drive voltage waveform applied to 12 is omitted.
  • a specific scan electrode 12 is set based on (Rule 1) and (Rule 2) to perform an address operation.
  • the plurality of scan driver ICs included in the scan pulse generation circuit 70 perform the same operation in parallel.
  • each scan driver IC does not apply a scan pulse to specific scan electrodes 12 of the plurality of scan electrodes 12 connected to the scan driver IC at the same time.
  • a write operation is sequentially applied.
  • the scan drivers IC1 to IC18 first apply the scan pulse voltage Va to the first scan electrodes SC1, SC61,.
  • the scan pulse voltage Va is applied to the third scan electrodes SC3, SC63,..., SC1023 of each scan driver IC, and thereafter, the scan pulses are sequentially applied to the odd-numbered scan electrodes 12 of each scan driver IC.
  • the voltage Va of the scan pulse is applied to the scan electrodes SC59, SC119,..., SC1079 of each scan driver IC, and the address period Pwo ends.
  • the time required for the write operation can be greatly shortened while preventing an overcurrent from occurring in the scan driver IC.
  • the scan pulse is applied only to the odd-numbered scan electrodes 12 and there are 18 scan driver ICs, the scan pulses are sequentially applied to each of the scan electrodes SC1 to SCn. Compared with the case of doing so, the time required for the write operation can be reduced to about 1/36.
  • each scan driver IC1 first applies a scan pulse to the second scan electrode 12, and then the fourth.
  • a scan pulse is applied to the scan electrode 12, and thereafter, the scan pulse is sequentially applied to the even-numbered scan electrodes 12.
  • FIG. 11 is a diagram schematically illustrating an example of a position coordinate detection operation when the light pen 50 is used in the image display system 100 according to the first embodiment of the present disclosure.
  • FIG. 11 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. 11 is the same as the drive voltage waveform shown in FIG.
  • the period Toy from the time to1 to the time ty0 (the time when the y-coordinate detection pulse is applied to the scan electrode SC1 in the first row in the y-coordinate detection period Py) and the time to1 to the time A period Tox until tx0 (time when the 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) is determined in advance.
  • the timing detection unit 54 detects the five consecutive light emission intervals in which the light emission intervals are the time To0, the time To1, the time To2, and the time To3, specifies the time to1, and uses the time to1 as a reference to the time ty0. And a coordinate reference signal det having rising edges at each of the times tx0 are 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.
  • the coordinate calculation unit 56 Based on the coordinate reference signal det, the coordinate calculation unit 56 measures a period Tyy from time ty0 to time tyy from which light is first received by the light receiving element 52 after time ty0. Then, the period Tyy is divided by Ty1 (pulse width of the y coordinate detection pulse) in the arithmetic circuit provided inside. 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 det, a time period Txx from time tx0 to time txx when light is first received by the light receiving element 52 after time tx0. . Then, the period Txx is divided by Tx1 (pulse width of the x coordinate detection pulse) in the arithmetic circuit provided inside. In this way, the x coordinate of the position of the light pen 50 in the image display area is calculated.
  • FIG. 12 is a diagram schematically illustrating an example of an operation when the light pen 50 is used in the image display system 100 according to the first embodiment of the present disclosure.
  • FIG. 13 is a diagram schematically illustrating an example of an operation when performing handwritten input with the light pen 50 in the image display system 100 according to Embodiment 1 of the present disclosure.
  • the light emission lines Ly that sequentially move from the upper end (first row) to the lower end (n-th row) of the image display area are displayed on the panel 10. Is displayed.
  • the light emission line Lx that sequentially moves from the left end (first pixel column) to the right end (m / 3 pixel column) of the image display area is displayed on the panel 10.
  • the light receiving element 52 of the light pen 50 receives light emission of “coordinate (x, y)” on the image display surface of the panel 10, the light emission line Ly passes through the coordinate (x, y) and the light emission time tyy. At time txx when the line Lx passes through 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 light emission line Ly is received at time tyy, and receives the light reception signal indicating that the light emission of the light emission line Lx is received. 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 light pen 50.
  • the timing detection subfield SFo in the timing detection subfield SFo, it is possible to reduce the time required for the write operation while preventing an overcurrent from occurring in the scan driver IC. Furthermore, it is possible to reduce the luminance of the light emission generated with the timing detection discharge and suppress the decrease in contrast.
  • the specific scanning electrode 12 is set based on the following (Rule 3) in addition to (Rule 1) and (Rule 2) described in the first embodiment.
  • a scan pulse is applied to the scan electrode 12 adjacent to the scan electrode 12 to which the scan pulse is applied in the write period Pwo at least in the write period Pwo of the field and the write period Pwo of the next field of the field. do not do.
  • N 5 temporally arranged fields (for example, fields Fj to Fj + 4, etc.) constitute one field group, and five scanning electrodes 12 arranged adjacent to each other. (For example, scan electrodes SCi to SCi + 4, etc.) constitute one scan electrode group. Then, in accordance with (Rule 1) and (Rule 2) shown in the first embodiment, a scan pulse is applied to each scan electrode 12 in the writing period Pwo.
  • the scan pulse is applied to the scan electrode SCi in the address period Pwo of the field Fj. Therefore, in the present embodiment, in accordance with (Rule 3), as shown in FIG. 14, scan electrode SCi ⁇ 1, SCi + 1 adjacent to scan electrode SCi has write period Pwo of field Fj and write of field Fj + 1. In the period Pwo, the voltage Vc is applied without applying the scanning pulse.
  • the number of discharge cells that generate an address discharge in one address period Pwo is about 1/5 of all the discharge cells in the image display area of the panel 10. For this reason, in the timing detection period Po in the present embodiment, the luminance of light emission caused by the timing detection discharge can be further reduced as compared with the example shown in the first embodiment.
  • the specific discharge cells in which the timing detection discharge is generated are scattered all over the image display surface of the panel 10, and the temporal and spatial continuity of the discharge cells in which the timing detection discharge is generated is increased. Therefore, the occurrence of flicker can be suppressed and the light emission pattern of the timing detection discharge can be made difficult to be recognized by the user.
  • FIG. 15 is a diagram schematically illustrating an example of a drive voltage waveform applied to the scan electrode 12 in the timing detection subfield SFo according to the second embodiment of the present disclosure.
  • the drive voltage waveform applied to the other scan electrodes 12 is omitted.
  • the plurality of scan driver ICs included in the scan pulse generation circuit 70 perform the same operation in parallel.
  • each scan driver IC does not apply a scan pulse to specific scan electrodes 12 of the plurality of scan electrodes 12 connected to the scan driver IC at the same time.
  • a write operation is sequentially applied.
  • each of the scan drivers IC1 to IC18 first applies the scan pulse voltage Va to the first scan electrodes SC1, SC61,.
  • the scan pulse voltage Va is applied to the scan electrodes SC6, SC66,..., SC1026.
  • the scan pulse is sequentially applied to the scan electrodes 12 every four lines, and finally, the scan electrodes SC56, SC116,.
  • the voltage Va of the scan pulse is applied to SC1076, and the address period Pwo ends.
  • the time required for the write operation can be greatly shortened while preventing an overcurrent from occurring in the scan driver IC.
  • every four scan pulses are applied to the scan electrode 12 and there are 18 scan driver ICs, so that the scan pulse is sequentially applied to each of the scan electrodes SC1 to SCn.
  • the time required for the write operation can be reduced to about 1/90.
  • the timing detection discharge it is desirable to set the time intervals when the timing detection discharge is generated a plurality of times at different times so that the first timing 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 the 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.
  • 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.
  • light emission for detecting the position coordinates of a light pen can be generated while reducing a contrast while reducing a driving time. Therefore, an image display device, a method for driving an image display device, and an image display Useful as a system.

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

Abstract

La présente invention a pour but d'entraîner une émission de lumière pour une détection de coordonnées d'emplacement d'un photostyle dans un court temps de commande tout en réduisant la détérioration de contraste. A cet effet, un procédé de commande de dispositif d'affichage d'image commande une unité d'affichage d'image par émission d'un sous-champ de détection de temporisation, comprenant : une période d'écriture qui transmet une impulsion d'écriture à une électrode de données, transmet une impulsion de balayage à une électrode de balayage, et amène une cellule de décharge à émettre une décharge d'écriture ; et une période de détection de temporisation qui amène la cellule de décharge à émettre une décharge de détection de temporisation que la décharge d'écriture a émise. Dans la période d'écriture du sous-champ de détection de temporisation, l'impulsion de balayage est transmise simultanément à une pluralité des électrodes de balayage.
PCT/JP2013/003437 2012-06-07 2013-05-31 Dispositif d'affichage d'image, procédé de commande de dispositif d'affichage d'image et système d'affichage d'image WO2013183264A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2012-129562 2012-06-07
JP2012-129561 2012-06-07
JP2012129562A JP2015155931A (ja) 2012-06-07 2012-06-07 画像表示装置の駆動方法、画像表示装置および画像表示システム
JP2012129561A JP2015155930A (ja) 2012-06-07 2012-06-07 画像表示装置の駆動方法、画像表示装置および画像表示システム

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
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
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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