JP2015232739A - Attachment for electronic pen and image display system - Google Patents

Attachment for electronic pen and image display system Download PDF

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Publication number
JP2015232739A
JP2015232739A JP2012220020A JP2012220020A JP2015232739A JP 2015232739 A JP2015232739 A JP 2015232739A JP 2012220020 A JP2012220020 A JP 2012220020A JP 2012220020 A JP2012220020 A JP 2012220020A JP 2015232739 A JP2015232739 A JP 2015232739A
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JP
Japan
Prior art keywords
electronic pen
coordinate detection
image display
coordinate
attachment
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Pending
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JP2012220020A
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Japanese (ja)
Inventor
剛 桑山
Takeshi Kuwayama
剛 桑山
井上 真一
Shinichi Inoue
真一 井上
秀彦 庄司
Hidehiko Shoji
秀彦 庄司
裕也 塩崎
Hironari Shiozaki
裕也 塩崎
貴彦 折口
Takahiko Origuchi
貴彦 折口
一哉 古割
Kazuya Furuwari
一哉 古割
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パナソニック株式会社
Panasonic Corp
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Priority to JP2012220020A priority Critical patent/JP2015232739A/en
Publication of JP2015232739A publication Critical patent/JP2015232739A/en
Application status is Pending legal-status Critical

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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03545Pens or stylus

Abstract

PROBLEM TO BE SOLVED: To provide an attachment for electronic pens for detecting light emission of an image display device for position coordinate detection from a position away from an image display surface.SOLUTION: The attachment for electronic pens has a condenser 82 held at one end of a cylindrical barrel body part 81, and an opening having a mechanism 84 for fit to an electronic pen at the other end of the barrel body part 81, where the light to enter the barrel body part 81 through the condenser 82 is focused on a light receiving-element of the electronic pen 50.

Description

  The present invention relates to an attachment for an electronic pen that draws an image on an image display device, an electronic pen, and an image display system using them.

  In recent years, an image display system that can input characters, pictures, and the like from an image display surface like a blackboard or a whiteboard using a flat display device has been studied. For example, in Patent Document 1, a position coordinate detection period is provided in one field only at the time of position coordinate detection using a plasma display panel, and light emission for position coordinate detection is generated within this period. Describes a coordinate position detection method for detecting the position coordinates pointed to by the electronic pen based on the timing detected by. Patent Document 2 describes an electronic pen that includes an electronic pen body, a pen tip that is pressed against an image display surface during a touch operation, and a connection state detection unit that detects a contact state on the image display surface. ing.

  On the other hand, applications such as using these image display systems for presentations and lectures have been developed. In the presentation, for example, a laser pointer as described in Patent Document 3 is used as an auxiliary instrument that points to a point on the image display surface from a distant position.

JP 2001-318765 A JP 2011-145663 A Japanese Patent Laid-Open No. 2-5018

  However, depending on the form of presentation or lecture, there is a demand for drawing from the image display surface by touching or approaching the image display device, and for displaying or drawing the cursor on the image display surface away from the image display device. . In this case, there is a trouble that an electronic pen and a laser pointer must be prepared and used separately.

  The present invention has been made in view of the above problems, and an attachment for an electronic pen for detecting light emission for position coordinate detection of an image display device from a position away from the image display surface. An object of the present invention is to provide an electronic pen that detects light emission for detecting position coordinates of an image display device from a position, and an image display system using them.

  In order to achieve the above object, an attachment for an electronic pen according to the present invention includes a condenser lens at one end of a cylindrical body and a mechanism for mounting the electronic pen at the other end of the body. And the light incident on the inside of the body through the condenser lens is condensed on the electronic pen. With this configuration, it is possible to provide an electronic pen attachment for detecting light emission for position coordinate detection of the image display device from a position away from the image display surface.

  The present invention also provides an attachment for an electronic pen that is attached to an electronic pen provided with a light receiving element, and includes a cylindrical body portion and a condensing lens held at one end of the body portion. By attaching the other end of the body part to the pen tip side of the pen, the light incident on the inside of the body part through the condenser lens is condensed on the light receiving element of the electronic pen. Also with this configuration, it is possible to provide an electronic pen attachment for detecting light emission for position coordinate detection of the image display device from a position away from the image display surface.

  In the electronic pen attachment of the present invention, it is desirable that the length of the body part is set so that the light receiving element of the electronic pen is positioned at the focal length on the optical axis of the condenser lens.

  Moreover, the attachment for electronic pens of this invention may be provided with the node part for pushing back the pen point part of an electronic pen to the inner side of an electronic pen inside a trunk | drum part.

  The image display system of the present invention also includes an image display device in which one field period is constituted by a plurality of subfields including a coordinate detection subfield, and an electronic pen that calculates the coordinates of an image display surface to be pointed based on light emission of the coordinate detection subfield. And an attachment for an electronic pen described above that is mounted on the electronic pen, and a drawing device that generates a drawing signal based on the coordinates calculated by the electronic pen and outputs the drawing signal to an image display device. With this configuration, an attachment for an electronic pen for detecting light emission for detecting position coordinates of the image display device from a position away from the image display surface, and for detecting position coordinates of the image display device from a position in contact with or close to the image display surface And an image display system using them.

  The image display device according to the present invention also includes an image display subfield for displaying an image, and an operation of simultaneously applying a y-coordinate detection pulse to the first number of scan electrodes while applying a y-coordinate detection voltage to the data electrodes. Remote y-coordinate detection subfield for proximity and remote operation for sequentially applying y-coordinate detection pulses to a second number of scanning electrodes larger than the first number while applying a y-coordinate detection voltage to data electrodes A y-coordinate detection subfield for proximity, an x-coordinate detection subfield for proximity that sequentially applies an x-coordinate detection pulse to the third number of data electrodes while applying an x-coordinate detection voltage to the scan electrodes, and a scan electrode Remote x-coordinate detection subfield for sequentially performing an operation of simultaneously applying x-coordinate detection pulses to a fourth number of data electrodes larger than the third number while applying an x-coordinate detection voltage to The electronic pen calculates the y-coordinate using the light emission of the proximity y-coordinate detection subfield when the electronic pen attachment is not mounted, and the proximity x The x coordinate is calculated using the light emission of the coordinate detection subfield, and when the electronic pen attachment is attached, the y coordinate is calculated using the light emission of the remote y coordinate detection subfield and the remote x coordinate detection subfield is used. The x-coordinate may be calculated using the light emission.

  According to the present invention, the electronic pen attachment for detecting light emission for detecting the position coordinate of the image display device from a position away from the image display surface, the position coordinate of the image display device from a position in contact with or close to the image display surface It becomes possible to provide an electronic pen for detecting light emission for detection and an image display system using them.

1 is a block diagram of a circuit of an image display system in an embodiment of the present invention. It is a disassembled perspective view of the panel of the image display system. It is an electrode array figure of the panel of the image display system. It is a drive voltage waveform figure applied to the panel of the image display system. It is a drive voltage waveform figure applied to the panel of the image display system. It is a perspective view which shows the state which mounted | wore the electronic pen in embodiment of this invention with the attachment. It is a three-view figure which shows the external appearance of the electronic pen. It is the double view and sectional drawing which show the shape of the front-end | tip part of the trunk | drum axis | shaft of the electronic pen. It is the double view and sectional drawing which show the shape of the neck axis of the electronic pen. It is the 2nd figure and sectional view which show the shape of the pen point part of the electronic pen. It is an exploded view which shows the detail of the front-end | tip part of the electronic pen. It is the 2nd figure and sectional view which show the shape of the attachment in embodiment of this invention. It is sectional drawing of the state which mounted | wore the electronic pen with the attachment. It is the double view and sectional drawing which show the other shape of the attachment. It is sectional drawing of the state which mounted | wore the electronic pen with the attachment. It is a schematic diagram explaining the position coordinate detection method of the electronic pen in embodiment of this invention. It is a timing chart explaining the position coordinate detection method of the electronic pen. It is a schematic diagram explaining the position coordinate detection method of the same electronic pen. It is a timing chart explaining the position coordinate detection method of the electronic pen. It is a schematic diagram which shows an example of drawing of the image display system in embodiment of this invention.

  Hereinafter, an image display system according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is a schematic diagram of a circuit block of an image display system 100 according to an embodiment of the present invention. The image display system 100 includes an image display device 30, a drawing device 40, an electronic pen 50, and an electronic pen attachment 80 (hereinafter simply referred to as “attachment 80”). A plurality of electronic pens 50 may be provided. Below, it demonstrates in detail in order of the image display apparatus 30, the electronic pen 50, the attachment 80, and the drawing apparatus 40. FIG.

  First, the image display device 30 will be described.

  The image display device 30 includes a display device that displays an image and a drive circuit that drives the display device. Hereinafter, an image display device 30 using a plasma display panel (hereinafter abbreviated as “panel”) 10 as a display device will be described as an example. However, the image display device uses a display device such as a liquid crystal or an organic EL. Also good.

  FIG. 2 is an exploded perspective view of panel 10 of the image display system in the embodiment of the present invention. On the glass front substrate 11, a plurality of display electrode pairs 14 made up of scanning electrodes 12 and sustaining electrodes 13 are formed. A dielectric layer 15 is formed so as to cover the display electrode pair 14, and a protective layer 16 is formed on the dielectric layer 15. 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 formed thereon. Then, on the side surface of the partition wall 24 and the dielectric layer 23, any one of the phosphor layer 25R that emits red light, the phosphor layer 25G that emits green light, and the phosphor layer 25B that emits light of each blue color. 25 is provided.

  The front substrate 11 and the rear substrate 21 are arranged to face each other so that the display electrode pair 14 and the data electrode 22 intersect with each other with a minute discharge space interposed therebetween, and the outer periphery thereof is sealed with a sealing material such as glass frit. Has been. A discharge gas is sealed in the discharge space. The discharge space is partitioned into a plurality of sections by barrier ribs 24, and discharge cells are formed at intersections of scan electrode 12, sustain electrode 13, and data electrode 22, respectively. These discharge cells discharge and emit light to display an image.

  FIG. 3 is an electrode array diagram of panel 10 of the image display system in the embodiment of the present invention. In panel 10, n scan electrodes SC1 to SCn (scan electrode 12 in FIG. 1) and n sustain electrodes SU1 to SUn (sustain electrode 13 in FIG. 1) extending in the row direction in FIG. M data electrodes D1 to Dm (data electrode 22 in FIG. 1) extending in the column direction are arranged. A discharge cell is formed at a portion where one pair of scan electrode SCi (i = 1 to n) and sustain electrode SUi intersects one data electrode Dj (j = 1 to m), and the discharge cell is in the discharge space. M × n are formed. Here, the three discharge cells formed at the intersection of the three adjacent data electrodes and the pair of display electrodes are a red subpixel, a green subpixel, and a blue subpixel. These three color sub-pixels constitute one pixel. Therefore, for example, if the panel 10 is a high definition panel having 1080 × 1920 pixels, n = 1080 and m = 1920 × 3 = 5760.

  The drive circuit of the image display device 30 includes an image signal processing unit 31, a data electrode drive unit 32, a scan electrode drive unit 33, a sustain electrode drive unit 34, and a control unit (not shown) that controls the operation of each circuit block. And a power supply unit (not shown) for supplying power necessary for each circuit block.

  The image signal processing unit 31 switches or synthesizes the input image signal and the image signal output from the drawing device 40, and outputs them to the data electrode driving unit 32. The data electrode driver 32 generates a drive voltage waveform to be applied to each of the data electrodes D1 to Dm. Scan electrode driver 33 generates a drive voltage waveform to be applied to each of scan electrodes SC1 to SCn, and sustain electrode driver 34 generates a drive voltage waveform to be applied to sustain electrodes SU1 to SUn.

  Next, the drive voltage waveform applied to each electrode of panel 10 will be described. In the present embodiment, one field period includes a plurality of image display subfields for displaying an image and a plurality of coordinate detection subfields for detecting coordinates.

  First, details of the image display subfield will be described. The image display subfield has a predetermined luminance weight, and an image is displayed by controlling light emission / non-light emission for each discharge cell in each image display subfield.

  The image display subfields in the present embodiment are eight subfields SF1 to SF8 having an initialization period, a writing period, and a sustain period. The luminance weights of the subfields SF1 to SF8 are, for example, (1, 34). 21, 13, 8, 5, 3, 2). However, the subfield configuration such as the number of subfields and the luminance weight is not limited to the above.

  FIG. 4 is a drive voltage waveform diagram applied to panel 10 of the image display system according to the embodiment of the present invention. Drive voltage applied to each electrode of panel 10 in subfields SF1 to SF3 among the image display subfields. The waveform is shown.

  In initialization period Pi of subfield SF1, voltage 0 (V) is applied to data electrodes D1 to Dm, voltage 0 (V) is applied to sustain electrodes SU1 to SUn, and voltage from voltage Vi1 is applied to scan electrodes SC1 to SCn. An upward ramp voltage that rises to Vi2 is applied. Next, 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, and the downward ramp voltage descending from the voltage 0 (V) to the voltage Vi4 is applied to the scan electrodes SC1 to SCn. Apply.

  Then, a weak initializing discharge occurs in all the discharge cells, the wall voltage on scan electrodes SC1 to SCn and the wall voltage on sustain electrodes SU1 to SUn are weakened, and the wall voltage on data electrodes D1 to Dm is written. It is adjusted to a value suitable for operation. Note that the luminance of light emission due to weak initialization discharge is low.

  In the subsequent address period Pw, voltage 0 (V) is applied to data electrodes D1 to Dm, voltage Ve is applied to sustain electrodes SU1 to SUn, and voltage Vc is applied to scan electrodes SC1 to SCn.

  Next, a scan pulse of voltage Va is applied to scan electrode SC1 in the first row, and voltage is applied to data electrode Dk (k = 1 to m) of the discharge cell to be emitted in the first row among data electrodes D1 to Dm. Vd write pulse is applied. Then, an address discharge is generated in the discharge cells in the first row to which the address pulse is applied, and wall voltage is accumulated on scan electrode SC1 and sustain electrode SU1. Thus, the address operation is performed in the discharge cells that should emit light in the first row. On the other hand, the address operation is not performed in the discharge cells to which the address pulse is not applied. Next, a scan pulse is applied to scan electrode SC2 in the second row, and an address pulse is applied to data electrode Dk of the discharge cell to be emitted in the second row among data electrodes D1 to Dm. Then, address discharge occurs in the discharge cells in the second row to which the address pulse is applied.

  Similarly, scan pulses are sequentially applied to scan electrodes SC3 to SCn and address pulses are applied to data electrodes Dk of the discharge cells to be emitted, and address discharge is performed in the discharge cells to be emitted in the third to nth rows. Are generated sequentially. The address discharge generated at this time is a slightly weaker discharge than the sustain discharge described later, and the luminance of light emission accompanying the discharge is also slightly lower.

  In the subsequent sustain period Ps, the voltage 0 (V) is applied to the data electrodes D1 to Dm. A sustain pulse of voltage Vs is applied to scan electrodes SC1 to SCn, and voltage 0 (V) is applied to sustain electrodes SU1 to SUn. Then, a sustain discharge occurs in the discharge cell in which the address discharge has occurred. Then, the polarity of the wall voltage on scan electrode SCi and sustain electrode SUi is reversed. In the discharge cells that have not performed the address operation, no sustain discharge occurs, and the wall voltage at the end of the initialization period Pi is maintained.

  Subsequently, voltage 0 (V) is applied to scan electrodes SC1 to SCn, and a sustain pulse is applied to sustain electrodes SU1 to SUn. Then, the sustain discharge occurs again in the discharge cell that has caused the sustain discharge. Then, the polarities of the wall voltage on scan electrode SCi and the wall voltage on sustain electrode SUi are reversed. Similarly, sustain pulses of the number corresponding to the luminance weight are alternately applied to scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn, and sustain discharge is continuously generated in the discharge cells that have caused address discharge in address period Pw. Let The sustain discharge generated at this time is a strong discharge, and the luminance of light emission accompanying the discharge is high.

  At the end of sustain period Ps, voltage 0 (V) is applied to data electrodes D1 to Dm, voltage 0 (V) is applied to sustain electrodes SU1 to SUn, and voltage 0 (V) is applied to scan electrodes SC1 to SCn. An upward ramp voltage that rises from 1 to the voltage Vr is applied. Then, a weak erasing discharge is generated in the discharge cell that has generated the sustain discharge, and the wall voltage on scan electrode SCi and on sustain electrode SUi is weakened while the wall voltage on data electrode Dk remains.

  In initialization period Pi of subfield SF2, voltage 0 (V) is applied to data electrodes D1 to Dm, voltage Ve is applied to sustain electrodes SU1 to SUn, and voltage from voltage 0 (V) is applied to scan electrodes SC1 to SCn. A downward ramp voltage that falls to Vi4 is applied. Then, a weak initializing discharge is generated in the discharge cell that has caused the sustain discharge in the immediately preceding subfield SF1, the wall voltage on scan electrode SCi and the wall voltage on sustain electrode SUi are weakened, and the wall on data electrode Dk is weakened. The voltage is adjusted to a value suitable for the write operation. On the other hand, the discharge cells that have not caused the sustain discharge in the immediately preceding subfield SF1 are not discharged, and the wall voltage at the end of the initialization period Pi in the immediately preceding subfield SF1 is maintained.

  Since the operation in the writing period Pw of the subfield SF2 is the same as the operation in the writing period Pw of the subfield SF1, description thereof is omitted. The operation in the subsequent sustain period Ps is the same as the operation in the sustain period Ps of the subfield SF1 except for the number of sustain pulses. The operations of subfields SF3 to SF8 are the same as those of subfield SF2 except for the number of sustain pulses.

  Next, the coordinate detection subfield will be described. The coordinate detection subfield in the present embodiment includes a synchronization detection subfield, a proximity y coordinate detection subfield, a proximity x coordinate detection subfield, a remote y coordinate detection subfield, and a remote x coordinate detection subfield. With the field.

  The synchronization detection subfield is a subfield in which the electronic pen emits light to synchronize with the light emission timing of the panel 10, and has an initialization period, a writing period, and a synchronization detection period.

  The proximity y-coordinate detection subfield and the remote y-coordinate detection subfield are subfields that emit light for detecting the y-coordinate on the image display surface pointed to by the electronic pen. Both the initialization period and the y-coordinate detection are detected. It has a period and an erasing period. Here, the proximity y-coordinate detection subfield is a subfield that emits light for accurately detecting the y-coordinate at a position on or near the image display surface, and the remote y-coordinate detection subfield is an image display. This is a subfield that generates light for detecting the y-coordinate even from a distance some distance from the surface.

  The proximity x-coordinate detection subfield and the remote x-coordinate detection subfield are subfields that emit light for detecting the x-coordinate on the image display surface pointed to by the electronic pen. Both the initialization period and the x-coordinate detection are detected. It has a period and an erasing period. Here, the proximity x-coordinate detection subfield is a subfield that emits light for accurately detecting the x-coordinate at a position on or near the image display surface, and the remote x-coordinate detection subfield is an image display. This is a subfield that generates light for detecting the x-coordinate even from a distance some distance from the surface.

  Here, the coordinate in the row direction is the x coordinate, and the coordinate in the column direction is the y coordinate.

  FIG. 5 is a waveform diagram of drive voltages applied to panel 10 of the image display system according to the embodiment of the present invention, and each electrode of panel 10 in each of the coordinate detection subfields following subfield SF8 of the image display subfield. The drive voltage waveform applied to is shown.

  In the initialization period Pi of the synchronization detection subfield SFo, 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, and the voltage 0 (V) is applied to the scan electrodes SC1 to SCn. To the voltage Vi4 is applied. Then, the wall voltage on each electrode is adjusted to a value suitable for the write operation.

  In the address period Pw of the synchronization detection subfield SFo, 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, and the voltage Vc is applied to the scan electrodes SC1 to SCn. Thereafter, an address pulse of voltage Vd is applied to data electrodes D1 to Dm, and a scan pulse of voltage Va is applied to scan electrodes SC1 to SCn. Then, address discharge occurs in all the discharge cells. In this embodiment, in order to shorten the driving time, a scan pulse is simultaneously applied to scan electrodes SC1 to SCn and an address pulse is simultaneously applied to data electrodes D1 to Dm, so that address discharge is simultaneously performed in all discharge cells. Is generated.

  After the address discharge has converged, the voltages of scan electrodes SC1 to SCn are returned to voltage Vc, and the voltages of data electrodes D1 to Dm are returned to voltage 0 (V).

  In the synchronization detection period Po of the synchronization detection subfield SFo, the synchronization detection pulse of the voltage Vso is applied to the scan electrodes SC1 to SCn and the sustain electrode at the time to1 after the time To0 has elapsed from the time to0 when the address discharge was last generated. A voltage 0 (V) is applied to SU1 to SUn, and synchronous detection discharge is generated in all the discharge cells. Next, at time to2 after time To1 has elapsed from time to1, voltage 0 (V) is applied to scan electrodes SC1 to SCn, and a synchronous detection pulse of voltage Vso is applied to sustain electrodes SU1 to SUn to detect synchronization again. Generate a discharge. Next, at time to3 after the lapse of time To2 from time to2, a synchronization detection pulse is applied to scan electrodes SC1 to SCn, and voltage 0 (V) is applied to sustain electrodes SU1 to SUn. Is generated. Subsequently, at time to4 after time To3 has elapsed from time to3, voltage 0 (V) is applied to scan electrodes SC1 to SCn and a synchronous detection pulse is applied to sustain electrodes SU1 to SUn, and a fourth synchronous detection discharge is performed. generate.

  Here, time To1, time To2, and time To3 are predetermined time intervals. As described later, synchronous detection is performed by detecting four discharges that occur at intervals of time To1, time To2, and time To3. The discharge is specified. In the present embodiment, time To0, time To1, time To2, and time To3 are, for example, 50 μs, 40 μs, 20 μs, and 30 μs, respectively. Note that the synchronous detection discharge itself generated at this time is a strong discharge similar to the sustain discharge, and the luminance of light emission accompanying the discharge is high.

  At the end of the synchronization detection period Po, the voltage 0 (V) is applied to the data electrodes D1 to Dm, the voltage 0 (V) is applied to the sustain electrodes SU1 to SUn, and the voltage 0 (V) is applied to the scan electrodes SC1 to SCn. ) To the voltage Vr, and the wall voltage on scan electrode SCi and sustain electrode SUi is weakened.

  In the initialization period Pi of the proximity y coordinate detection subfield SFy1, 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, and the voltage 0 is applied to the scan electrodes SC1 to SCn. A downward ramp voltage that falls from (V) to voltage Vi4 is applied. Then, a weak initializing discharge occurs in all the discharge cells, and the wall voltage on each electrode is adjusted to a value suitable for the coordinate detection operation.

  In the y coordinate detection period Py1 of the proximity y coordinate detection subfield SFy1, an operation of simultaneously applying a y coordinate detection pulse to the first number of scan electrodes while applying the y coordinate detection voltage Vdy to the data electrodes D1 to Dm. Do it sequentially. In the following description, it is assumed that the first number is “1”, but the first number may be “2” or more.

  First, voltage 0 (V) is applied to data electrodes D1 to Dm, voltage Ve is applied to sustain electrodes SU1 to SUn, and voltage Vc is applied to scan electrodes SC1 to SCn.

  Next, the y coordinate detection voltage Vdy is applied to the data electrodes D1 to Dm. Then, a y-coordinate detection pulse of voltage Vay is applied to scan electrode SC1 in the first row, which is one scan electrode from the first number “1”. Then, a discharge for detecting the y coordinate (hereinafter abbreviated as “y coordinate detection discharge”) is generated in the discharge cells in the first row. Thus, the first pixel row emits light.

  Next, the y coordinate detection pulse is applied to the scan electrode SC2 in the second row while the y coordinate detection voltage Vdy is applied to the data electrodes D1 to Dm. Then, y coordinate detection discharge is generated in the discharge cells in the second row. Thus, the second pixel row emits light.

  Similarly, the y-coordinate detection pulses are sequentially applied to the scan electrodes SC3 to SCn while the y-coordinate detection voltage Vdy is applied to the data electrodes D1 to Dm, so that the third to nth pixel rows are sequentially emitted. .

  As described above, in the y coordinate detection period Py1 of the proximity y coordinate detection subfield SFy1, the first number of scan electrodes is simultaneously applied to the first number of scan electrodes while the y coordinate detection voltage Vdy is applied to the data electrodes D1 to Dm. In the case of “1”, the operation of applying the y-coordinate detection pulse is sequentially performed for each scanning electrode. In the present embodiment, since the first number is “1”, the phrase “sequentially applying the y-coordinate detection pulse to the first number of scan electrodes simultaneously” is “one scan electrode. It goes without saying that the operation of applying the y-coordinate detection pulse is sequentially performed.

  Note that the y-coordinate detection discharge generated at this time is a discharge similar to the address discharge, which is slightly weaker than the sustain discharge, and the luminance of light emission accompanying the discharge is also slightly lower.

  In this way, in the y-coordinate detection period Py1, the horizontal line that emits light with the thickness of one pixel row moves pixel by pixel from the upper end to the lower end of the image display surface. Therefore, as will be described later, the y-coordinate of the image display surface pointed to by the electronic pen can be detected by receiving the light emission of the horizontal line with the electronic pen located near the image display surface and knowing the timing of the light emission.

  In the erasing period Pe of the proximity y-coordinate detection subfield SFy1, the voltage 0 (V) is applied to the data electrodes D1 to Dm, the voltage 0 (V) is applied to the sustain electrodes SU1 to SUn, and the scan electrodes SC1 to SCn are applied. An ascending ramp voltage that rises from voltage 0 (V) to voltage Vr is applied to generate a weak erase discharge in the discharge cell.

  The operation in the initialization period Pi of the proximity x coordinate detection subfield SFx1 is substantially the same as the operation in the initialization period Pi of the proximity y coordinate detection subfield SFy1.

  In the x coordinate detection period Px1 of the proximity x coordinate detection subfield SFx1, the operation of simultaneously applying the x coordinate detection pulse to the third number of data electrodes while applying the x coordinate detection voltage Vax to the scan electrodes SC1 to SCn. Do it sequentially. In the following description, the third number is assumed to be “3”, but the third number may be a number other than “3”.

  First, voltage 0 (V) is applied to data electrodes D1 to Dm, voltage Ve is applied to sustain electrodes SU1 to SUn, and voltage Vax is applied to scan electrodes SC1 to SCn.

  Next, with the x coordinate detection voltage Vax being applied to the scan electrodes SC1 to SCn, the x coordinate detection pulse of the voltage Vdx is applied to the data electrodes D1 to D3 in the first column to the third column. Then, discharge for detecting the x coordinate (hereinafter abbreviated as “x coordinate detection discharge”) occurs in the discharge cells in the first to third columns. Thus, the first pixel column emits light.

  Next, the x coordinate detection pulse is applied to the data electrodes D4 to D6 in the fourth column to the sixth column while the x coordinate detection voltage Vax is applied to the scan electrodes SC1 to SCn. Then, discharge for detecting the x coordinate occurs in the discharge cells in the fourth to sixth columns. Thus, the second pixel column emits light.

  Similarly, with the x-coordinate detection voltage Vax being applied to the scan electrodes SC1 to SCn, the third number “3”, that is, the x-coordinate detection pulse is sequentially applied to the data electrodes of every three columns, so that the discharge cell The light is sequentially emitted from the three rows to the mth discharge cell row.

  In this way, in the x coordinate detection period Px1 of the proximity x coordinate detection subfield SFx1, the x coordinate detection pulse is simultaneously applied to the third number of data electrodes while the x coordinate detection voltage Vax is applied to the scan electrodes SC1 to SCn. Perform operations sequentially. In the present embodiment, since the third number is “3”, the operation of sequentially applying the x-coordinate detection pulses to the three data electrodes is sequentially performed. Here, if the third number is “1”, the phrase “sequentially applying the x-coordinate detection pulse to the third number of data electrodes at the same time” means “one data electrode It goes without saying that the operation of applying the x-coordinate detection pulse is sequentially performed.

  Note that the x-coordinate detection discharge generated at this time is the same discharge as the address discharge, which is slightly weaker than the sustain discharge, and the luminance of the light emission accompanying the discharge is slightly lower.

  In this way, in the x-coordinate detection period Px1, the vertical line extending in the vertical direction that emits light with the thickness of one pixel column moves from the left end to the right end of the image display surface by one pixel column. Therefore, as will be described later, the x-coordinate of the image display surface pointed to by the electronic pen can be detected by receiving the light emission of the vertical line with the electronic pen located near the image display surface and knowing the timing of the light emission.

  The operation of the erasing period Pe of the proximity x coordinate detection subfield SFx1 is substantially the same as the operation of the erasing period Pe of the proximity y coordinate detection subfield SFy1.

  The operation in the initialization period Pi of the remote y coordinate detection subfield SFy2 is substantially the same as the operation in the initialization period Pi of the proximity y coordinate detection subfield SFy1.

  In the y coordinate detection period Py2 of the remote y coordinate detection subfield SFy2, the y coordinate is simultaneously applied to the second number of scan electrodes larger than the first number while the y coordinate detection voltage Vdy is applied to the data electrodes D1 to Dm. The operation of applying the detection pulse is sequentially performed. In the following description, it is assumed that the second number is “8”, but the second number is larger than the first number “1” of the proximity y-coordinate detection subfield SFy1 and is “8”. It may be other than.

  First, voltage 0 (V) is applied to data electrodes D1 to Dm, voltage Ve is applied to sustain electrodes SU1 to SUn, and voltage Vc is applied to scan electrodes SC1 to SCn.

  Next, the y coordinate detection voltage Vdy is applied to the data electrodes D1 to Dm. In the proximity y-coordinate detection subfield SFy1, the voltage Vay is applied to the scan electrodes SC1 to SC8 in a plurality of rows, that is, in the present embodiment, more than the number applied to the scan electrodes simultaneously. The y coordinate detection pulse is applied. Then, discharge for detecting the y coordinate occurs in the discharge cells in the first to eighth rows. Thus, the first to eighth pixel rows emit light.

  Next, with the y coordinate detection voltage Vdy applied to the data electrodes D1 to Dm, the y coordinate detection pulse is applied to the scan electrodes SC2 to SC16 in the next plurality of rows, in the present embodiment, the ninth to sixteenth rows. Apply. Then, discharge for detecting the y coordinate occurs in the discharge cells in the 9th to 16th rows. Thus, the 9th to 16th pixel rows emit light.

  Similarly, in this embodiment, the y coordinate is applied to the scan electrodes SC17 to SCn by a plurality of rows larger than the proximity y coordinate detection subfield SFy1 while the y coordinate detection voltage Vdy is applied to the data electrodes D1 to Dm. The detection pulses are sequentially applied every 8 rows, and the 17th to nth pixel rows are sequentially emitted light by 8 rows.

  Thus, in the y-coordinate detection period Py2 of the remote y-coordinate detection subfield SFy2, the second number larger than the first number while applying the y-coordinate detection voltage Vdy to the data electrodes D1 to Dm, this embodiment In FIG. 5, the operation of applying y-coordinate detection pulses simultaneously to the eight scanning electrodes is sequentially performed.

  As described above, in the remote y-coordinate detection subfield SFy2, the y-coordinate detection discharge is simultaneously emitted in a plurality of rows, that is, 8 pixel rows in the present embodiment, more than in the proximity y-coordinate detection subfield SFy1. Therefore, the luminance of the light emission associated with the discharge is stronger than the light emission associated with the y coordinate detection discharge in the proximity y coordinate detection subfield SFy1.

  Thus, in the remote y-coordinate detection period Py2, the horizontal line extending in the horizontal direction that emits light with the thickness of 8 pixel rows moves from the upper end portion to the lower end portion of the image display surface by 8 pixel rows. Therefore, as will be described later, even when the position is far from the image display surface, the electronic pen can receive the emission of the horizontal line, and the y coordinate of the image display surface pointed to by the electronic pen can be detected. However, since the horizontal line moves by 8 pixel rows, the y-coordinate detection accuracy decreases to 1/8.

  The operation of the erasing period Pe of the remote y coordinate detection subfield SFy2 is substantially the same as the operation of the erasing period Pe of the proximity y coordinate detection subfield SFy1.

  The operation during the initialization period Pi of the remote x-coordinate detection subfield SFx2 is substantially the same as the operation during the initialization period Pi of the proximity x-coordinate detection subfield SFx1.

  In the x-coordinate detection period Px2 of the remote x-coordinate detection subfield SFx2, the x-coordinate is simultaneously applied to the fourth number of data electrodes larger than the third number while the x-coordinate detection voltage Vax is applied to the scan electrodes SC1 to SCn. The operation of applying the detection pulse is sequentially performed. In the following description, it is assumed that the fourth number is “24”, but the fourth number is larger than the third number “3” of the proximity x-coordinate detection subfield SFx1 and is not “24”. May be the number.

  First, voltage 0 (V) is applied to data electrodes D1 to Dm, voltage Ve is applied to sustain electrodes SU1 to SUn, and voltage Vax is applied to scan electrodes SC1 to SCn.

  Next, with the x-coordinate detection voltage Vax being applied to the scan electrodes SC1 to SCn, a plurality of columns larger than the number applied simultaneously to the data electrodes in the proximity x-coordinate detection subfield SFx1, one column in the present embodiment. An x coordinate detection pulse of voltage Vdx is applied to the data electrodes D1 to D24 in the 24th column to the 24th column. Then, discharge for detecting the x coordinate occurs in the discharge cells in the first to 24th columns. Thus, the first to eighth pixel columns emit light.

  Next, with the x-coordinate detection voltage Vax being applied to the scan electrodes SC1 to SCn, the x-coordinate detection pulses are applied to the data electrodes D25 to D48 in the next plurality of columns, in this embodiment, the 25th to 48th columns. Apply. Then, discharge for detecting the x coordinate occurs in the discharge cells in the 25th to 48th columns. Thus, the 9th to 16th pixel columns emit light.

  Similarly, in the present embodiment, a plurality of columns more than the proximity x-coordinate detection subfield SFx1, with the x-coordinate detection voltage Vax being applied to the scan electrodes SC1 to SCn. Coordinate detection pulses are sequentially applied to sequentially emit light by 24 discharge cell rows, that is, 8 pixel rows, up to the mth discharge cell row.

  Thus, in the x-coordinate detection period Px2 of the remote x-coordinate detection subfield SFx2, the fourth number larger than the third number, with the x-coordinate detection voltage Vax being applied to the scan electrodes SC1 to SCn, the present embodiment In FIG. 4, the operation of simultaneously applying x-coordinate detection pulses to 24 data electrodes is sequentially performed.

  As described above, in the remote x-coordinate detection subfield SFx2, multiple x-coordinate detection subfields SFx1 more than the proximity x-coordinate detection subfield SFx1, and in this embodiment, the x-coordinate detection discharge is simultaneously emitted for every eight pixel columns. Therefore, the luminance of the light emission associated with the discharge is stronger than the light emission associated with the x coordinate detection discharge in the proximity x coordinate detection subfield SFx1.

  In this way, in the remote x-coordinate detection period Px2, the vertical line extending in the vertical direction, which emits light with the thickness of 8 pixel columns, moves by 8 pixel columns from the left end to the right end of the image display surface. Therefore, as will be described later, even when the position is far from the image display surface, the electronic pen can receive the emission of vertical lines, and the x coordinate of the image display surface indicated by the electronic pen can be detected. However, since the vertical line moves by 8 pixel columns, the detection accuracy of the x coordinate is lowered to 1/8.

  The operation of the erasing period Pe of the remote x-coordinate detection subfield SFx2 is the same as the operation of the erasing period Pe of the proximity x-coordinate detection subfield SFx1.

  As described above, in the present embodiment, the coordinate detection subfield includes the synchronization detection subfield SFo, the two y coordinate detection subfields SFy1 and SFy2, and the two x coordinate detection subfields SFx1 and SFx2. Yes.

  In the proximity y-coordinate detection period Py1, the horizontal line that emits light with the thickness of the first number of pixel rows moves from the upper end portion to the lower end portion of the image display surface by the first number of pixel rows to detect the proximity x-coordinate detection. In the period Px1, the vertical lines that emit light with the thickness of the (third number / 3) pixel column move from the left end portion to the right end portion of the image display surface by the (third number / 3) pixel row. For this reason, although the luminance of light emitted from these discharges is low, the coordinates can be detected with high accuracy. As will be described later, in order to detect the coordinates with an electronic pen that is in contact with or close to the image display surface. Used.

  In the remote y-coordinate detection period Py2, the horizontal line that emits light with the thickness of the second number of pixel rows moves from the upper end portion to the lower end portion of the image display surface by the second number of pixel rows. In the detection period Px2, the vertical line that emits light with the thickness of the (fourth number / 3) pixel column moves from the left end portion to the right end portion of the image display surface by the (fourth number / 3) pixel row. Therefore, the accuracy of the coordinates to be detected is deteriorated, but the luminance of the light emission due to these discharges is higher than the luminance of the light emission of the proximity coordinate detection subfield, so that it is located away from the image display surface as will be described later. Even an electronic pen can detect coordinates.

  In the above description, the first number is “1”, the second number is “8”, the third number is “3”, and the fourth number is “24”. It is not limited to. For example, the second number is “40”, the fourth number is “120”, and horizontal lines that emit light with a thickness of 40 pixel rows in the remote y coordinate detection period Py2 are from the upper end to the lower end of the image display surface. Forty-eight pixel rows may be moved, and in the remote x-coordinate detection period Px2, vertical lines that emit light with a thickness of 40 pixel columns may be moved by 40 pixel columns from the left end to the right end of the image display surface. By doing so, the accuracy of the coordinates to be detected is deteriorated, but since the luminance of light emission accompanying these discharges is further increased, the distance of the coordinate detection of the electronic pen is increased to, for example, about 8 m, and remote control can be performed even in a large conference room. Can be done.

  In this embodiment, the voltage value applied to each electrode is, for example, voltage Vi1 = 150 (V), voltage Vi2 = 350 (V), voltage Vi4 = −175 (V), voltage Va = voltage Vay = voltage Vax. = −200 (V), voltage Vc = −50 (V), voltage Vs = voltage Vso = 205 (V), voltage Vr = 205 (V), voltage Ve = 155 (V), voltage Vd = voltage Vdy = voltage Vdx = 55 (V). However, these voltage values are merely examples, and it is desirable to set them to optimum values as appropriate in accordance with the characteristics of the panel 10 and the specifications of the image display apparatus.

  Next, the electronic pen 50 and the electronic pen attachment 80 will be described in detail with reference to the drawings.

  The electronic pen 50 inputs a character or a picture or the like on the image display surface with the tip 80 brought into contact with the image display surface of the panel 10 without attaching the attachment 80, or from the close position of the image display surface. Is received, the light emitted from the image display device is received, and the coordinates on the image display surface pointed to by the electronic pen 50 are calculated.

  In the present embodiment, as shown in FIG. 1, the electronic pen 50 includes a drawing switch 51, a light receiving element 52, a synchronization detection unit 56, a coordinate calculation unit 57, and a transmission unit 58, and an image of the panel 10. Light emitted from the display surface is received, and y and x coordinates on the indicated image display surface are output.

  The drawing switch 51 is attached in the vicinity of the tip of the electronic pen 50 and is turned “on” when the electronic pen 50 is in contact with the image display surface of the panel 10 and turned “off” when the electronic pen 50 is separated from the image display surface.

  The light receiving element 52 is attached to the tip of the electronic pen 50, receives light emitted from the panel 10, and outputs a light reception signal to each of the synchronization detection unit 56 and the coordinate calculation unit 57.

  The synchronization detection unit 56 detects predetermined light emission from the received light signal, creates a coordinate reference signal synchronized with the driving of the image display device 30, and outputs the coordinate reference signal to the coordinate calculation unit 57.

  The coordinate calculation unit 57 calculates the x coordinate and the y coordinate of the image display surface indicated by the electronic pen 50 based on the coordinate reference signal and the light reception signal.

  The transmitting unit 58 encodes the coordinates (x, y) calculated by the coordinate calculating unit 57 and wirelessly transmits the coordinates (x, y) to the receiving unit 42. The accompanying information is transmitted to the receiving unit 42 by radio.

  The electronic pen attachment 80 is attached to the electronic pen 50, thereby detecting the coordinates indicated by the electronic pen 50 and displaying characters or pictures on the image display surface even from a position far from the image display surface. It is for inputting or displaying a cursor.

  FIG. 6 is a perspective view showing a state in which the attachment 80 is attached to the electronic pen 50 according to the embodiment of the present invention. A condensing lens 82 is held at one end of the cylindrical body portion of the attachment 80. Then, by attaching the other end of the body portion to the pen tip side of the electronic pen 50, the light incident on the inside of the body portion through the condenser lens 82 is condensed on the light receiving element of the electronic pen 50. At this time, the length of the body portion of the attachment 80 is set so that the light receiving element of the electronic pen 50 is positioned at the position of the focal length on the optical axis of the condenser lens.

  FIG. 7 is a three-sided view showing the external appearance of the electronic pen 50 in the embodiment of the present invention.

  The cylindrical case of the electronic pen 50 includes a body shaft 60 and a neck shaft 64 at the tip. The trunk shaft 60 in the present embodiment includes a partial trunk shaft 60a, a partial trunk shaft 60b, and a battery case cover 60c. Then, a power switch 68a and a pilot lamp 69 are mounted so as to be sandwiched between the two partial barrel shafts 60a and 60b, and various components such as various switches 68b and 68c are further mounted. In addition, a pen tip portion 70 is provided at the tip of the electronic pen 50 on the neck 64 side.

  FIG. 8 is a two-sided view and a cross-sectional view showing the shape of the distal end portion of the body shaft 60 of the electronic pen 50 in the embodiment of the present invention. A through hole 61 is provided at the distal end portion of the trunk shaft 60 for mounting the light receiving element 52 (not shown) so as to be exposed from the distal end portion. Further, notches 63 a and 63 b for positioning the pen tip portion 70 are provided around the through hole 61. A screw 62 for screwing the neck shaft 64 is engraved on the outer wall at the tip of the trunk shaft 60.

  FIG. 9 is a two-view diagram and a cross-sectional view showing the shape of the neck shaft 64 of the electronic pen 50 according to the embodiment of the present invention. A penetrating hole 65 for penetrating and holding the pen tip portion 70 is provided at the tip portion of the neck shaft 64. A screw 66 for screwing the body shaft 60 is engraved on the inner wall of the neck shaft 64. Further, a fitting groove 67 for fitting and fixing the attachment 80 is formed on the outer wall of the neck shaft 64.

  FIG. 10 is a two-side view and a cross-sectional view showing the shape of the pen tip portion 70 of the electronic pen 50 in the embodiment of the present invention. The pen tip portion 70 is formed of a relatively soft material so that it can be moved more smoothly so as not to damage the image display surface of the image display device 30 and to reduce the sound at the time of contact with the image display surface. ing. In this embodiment, it is made of polyacetal, but it may be made of polyamide or fluororesin. The pen tip portion 70 has a cavity 72 formed therein so as to cover the light receiving element 52 (not shown), and a light receiving window 71 for receiving light by the light receiving element 52 is provided at the tip thereof. The light receiving window 71 is a through hole in the present embodiment. Further, a positioning claw 73 a for mounting the pen tip portion 70 on the tip end portion of the barrel shaft 60 and a switch push claw 73 b for pressing the drawing switch 51 are provided.

  As described above, the pen tip portion 70 houses the light receiving element 52 in the cavity 72 inside the pen tip portion 70, and the pen tip portion 70 is held at the distal end portion of the barrel shaft 60.

  FIG. 11 is an exploded view showing details of the tip portion of the electronic pen 50 in the embodiment of the present invention. At the front end portion of the trunk shaft 60, the light receiving element 52 and a part of the circuit board 78 are fixed inside the trunk shaft 60 so as to be exposed from the through hole 61 of the trunk shaft 60. Although not shown, the drawing switch 51 is mounted on a circuit board 78 inside the barrel shaft 60.

  The pen tip portion 70 is held by a neck shaft 64 so as to be slidable in the longitudinal direction of the electronic pen 50. A spring 75 is provided between the pen tip portion 70 and the light receiving element 52. Further, a buffer material 76 is provided between the pen tip portion 70 and the barrel shaft 60. The cushioning material 76 is provided so that the pen tip portion 70 and the tip end portion of the barrel shaft 60 are not in direct contact with each other to generate unpleasant noise. The pen tip portion 70 is pushed in a direction to protrude from the neck shaft 64 by the rigidity of the spring 75. In this state, the drawing switch 51 is “off”.

  When the user presses the pen tip portion 70 of the electronic pen 50 against the image display surface, the pen tip portion 70 is pushed back in a direction to be pulled inside the neck shaft 64 against the rigidity of the spring 75. Then, the tip of the switch pressing claw 73b of the pen tip 70 pushes down the drawing switch 51, and the drawing switch 51 is turned on. When the user moves the electronic pen 50 away from the image display surface, the drawing switch 51 is turned “off” because the rigidity of the spring 75 causes the pen tip portion 70 to be pushed out again from the neck 64.

  FIG. 12 is a two-side view and a sectional view showing the shape of the attachment 80 in the embodiment of the present invention. The attachment 80 includes a cylindrical body 81, a condensing lens 82, a condensing lens fixing member 83, and a mechanism for mounting on the electronic pen 50. The inside of the body part 81 is colored black in order to prevent the reflected light on the wall surface. Although not shown in detail, the body 81 and the condensing lens fixing member 83 are fixed by fitting the condensing lens 82, and the condensing lens 82 is removed by removing the condensing lens fixing member 83. Can be removed. Further, on the inner wall of the body portion 81 on the side to be attached to the electronic pen 50, as a mechanism for attaching to the electronic pen 50, there is a convex portion 84 for fixing the attachment 80 by fitting into the fitting groove 67 of the neck shaft 64. Is provided. Further, on the inner side of the body portion 81, a node portion 85 is provided for pushing back the pen tip portion 70 in a direction in which the pen tip portion 70 is pulled inside the neck shaft 64. The node 85 is provided with a hole 86 centered at a position intersecting with the optical axis of the condenser lens 82, and allows light from the condenser lens to pass through the pen tip part 70.

  FIG. 13 is a cross-sectional view of the state in which the attachment 80 according to the embodiment of the present invention is attached to the electronic pen 50. The attachment 80 is fixed by fitting the convex portion 84 of the attachment 80 into the fitting groove 67 of the neck 64 of the electronic pen 50. At this time, the length of the body portion 81 is designed so that the light receiving element 52 is located at a position substantially at the focal length on the optical axis of the condenser lens 82. When the attachment 80 is attached to the electronic pen 50, the node portion 85 pushes back the pen tip portion 70 in the direction of pulling the pen tip portion 70 into the inner side of the neck shaft 64, so that the tip of the switch pushing claw 73b of the pen tip portion 70 pushes down the drawing switch 51 Thus, the drawing switch 51 is always “ON”. Then, in a state where the drawing switch 51 is “ON”, the light incident from the condenser lens 82 into the attachment 80 passes through the hole 86 of the node portion 85 and the light receiving window 71 of the pen tip portion 70. To reach.

  In the above description, the attachment 80 of the type that is fitted and fixed in the fitting groove 67 of the neck 64 of the electronic pen 50 has been described. However, the shape of the attachment is not limited to this.

  For example, FIG. 14 is a two-side view and a cross-sectional view showing another shape of the attachment according to the embodiment of the present invention. The attachment 90 includes a cylindrical body 91, a condensing lens 82, a condensing lens fixing member 83, and a mechanism for attaching to the electronic pen 50. The inside of the body part 91 is colored black. Further, a screw 94 for screwing the screw 62 of the barrel shaft 60 is engraved on the inner wall of the trunk portion 91 on the side to be attached to the electronic pen 50. Further, on the inner side of the body portion 91, a node portion 95 is provided for pushing back the pen tip portion 70 in the direction in which the pen tip portion 70 is pulled inside the body shaft 60. The main difference from the attachment 80 shown in FIG. 12 is a mechanism that is attached to the electronic pen 50, and is that a screw 94 is provided instead of the convex portion 84 of the attachment 80.

  FIG. 15 is a cross-sectional view of the attachment 90 in the electronic pen 50 according to the embodiment of the present invention. In order to attach the attachment 90 to the electronic pen 50, first, the neck 64 of the electronic pen 50 is removed. Then, the screw 94 of the attachment 90 is screwed to the screw 62 of the body shaft 60 of the electronic pen 50. At this time, the length of the body portion 91 is designed so that the light receiving element 52 is located at a position substantially at the focal length on the optical axis of the condenser lens 82. When the attachment 90 is attached to the electronic pen 50, the node portion 95 pushes back the pen tip portion 70 in the direction in which the pen tip portion 70 is pulled inside the body shaft 60, so that the tip of the switch claw 73b of the pen tip portion 70 pushes down the drawing switch 51. Thus, the drawing switch 51 is always “ON”.

  As described above, the electronic pen attachment 80 which is an example of the embodiment is an electronic pen attachment to be attached to the electronic pen 50 including the light receiving element, and includes one of the cylindrical body portion 81 and the body portion 81. And the other end of the body 81 is attached to the pen tip side of the electronic pen 50, so that the light enters the body 81 through the condenser lens 82. The light to be condensed is collected on the light receiving element 52 of the electronic pen 50.

  The length of the body portion 81 of the attachment 80 is set so that the light receiving element 52 of the electronic pen 50 is positioned at the focal length position on the optical axis of the condenser lens 82. Further, a node portion 85 for pushing the pen tip portion 70 of the electronic pen 50 back to the inside of the electronic pen 50 is provided inside the body portion 81. An attachment 90 which is an example of another embodiment has substantially the same configuration except for a mechanism attached to the body portion 81.

  Next, the operation of the electronic pen 50 will be described. First, a case where the electronic pen 50 is used while being in contact with the image display surface of the image display device 30 without mounting the attachment 80 will be described. In this case, since the attachment 80 is not attached, the state of the drawing switch 51 is “off”. If the state of the drawing switch 51 when the electronic pen 50 is turned on is “OFF”, the electronic pen 50 determines that the attachment 80 is not attached and performs the following operation.

  FIG. 16 is a schematic diagram for explaining a position coordinate detection method of the electronic pen 50 according to the embodiment of the present invention. The electronic pen 50 is used in contact with the image display surface of the image display device 30 or the image display surface. The case where it uses in the position near is shown. FIG. 17 is an example of a timing chart for explaining a method of detecting the position coordinates of the electronic pen 50 in the embodiment of the present invention. The drive voltage waveforms of the scan electrodes SC1 to SCn, the drive voltage waveforms of the data electrodes D1 to Dm, The light reception signal in this case is shown together with the coordinate reference signal. Here, the threshold value th indicates the lowest level of the received light signal that allows the light receiving element 52 to detect light emission stably.

  As described above, in the y coordinate detection period Py1 of the proximity y coordinate detection subfield SFy1, the proximity horizontal line Ly1 moving from the upper end portion to the lower end portion of the image display surface is displayed. In the present embodiment, since the first number is “1”, the proximity horizontal line Ly1 is a line of one pixel width extending in the horizontal direction. Then, at time tyy1 when the horizontal line Ly1 passes through the coordinates (x, y) of the image display surface pointed to by the electronic pen 50, the light receiving element 52 receives light emission of the horizontal line Ly1. Therefore, the light receiving element 52 outputs a light reception signal indicating light reception at time tyy1. In the x coordinate detection period Px1 of the proximity x coordinate detection subfield SFx1, a proximity vertical line Lx1 moving from the left end portion to the right end portion of the image display surface is displayed. In the present embodiment, since the third number is “3”, the proximity vertical line Lx1 is a line extending in the vertical direction with a width of 3 sub-pixels, that is, a width of 1 pixel. Then, at time txx1 when the vertical line Lx1 passes through the coordinates (x, y) of the image display surface pointed to by the electronic pen 50, the light receiving element 52 receives light emission of the vertical line Lx1. Therefore, the light receiving element 52 outputs a light reception signal indicating light reception at time txx1.

  Here, the time from time ty01 to time ty1 is time Ty1, the time from time ty01 to applying the y coordinate detection pulse to the first scan electrode SC1 is time Ty01, and the cycle of applying the y coordinate detection pulse is time Ty11. Then, the coordinate calculation part 57 calculates | requires y coordinate by dividing time (Tyy1-Ty01) by time Ty11. Further, assuming that the time from time tx01 to time txx1 is time Txx1, the time until the first application of the x coordinate detection pulse is time Tx01, and the cycle of applying the x coordinate detection pulse is time Tx11, the coordinate calculation unit 57 Divide (Txx1-Tx01) by time Tx11 to obtain the x coordinate.

  When the light receiving element 52 receives the light emission of the horizontal line Ly1 of the proximity y coordinate detection subfield SFy1, it also receives the light emission of the horizontal line Ly2 of the remote y coordinate detection subfield SFy2, and the proximity x coordinate detection subfield SFx1. When the light emission of the vertical line Lx1 is received, the light emission of the vertical line Lx2 of the remote x-coordinate detection subfield SFx2 is also received. However, when the attachment 80 is not attached to the electronic pen 50, the coordinate calculation unit 57 detects the y coordinate using the light emission of the horizontal line Ly1, and detects the x coordinate using the light emission of the vertical line Lx1.

  Next, a case where the attachment 80 is attached to the electronic pen 50 and the electronic pen 50 is used at a position far from the image display device 30 will be described. In this case, since the attachment 80 is attached, the state of the drawing switch 51 is “ON”. If the state of the drawing switch 51 when the electronic pen 50 is turned on is “ON”, the electronic pen 50 determines that the attachment 80 is attached and performs the following operation.

  FIG. 18 is a schematic diagram for explaining a method for detecting the position coordinates of the electronic pen 50 according to the embodiment of the present invention. The attachment 80 is attached to the electronic pen 50 and used away from the image display surface of the image display device 30. Shows the case. FIG. 19 is a timing chart for explaining the position coordinate detection method of the electronic pen 50 according to the embodiment of the present invention. The drive voltage waveforms of the scan electrodes SC1 to SCn, the drive voltage waveforms of the data electrodes D1 to Dm, and the coordinate reference. The light reception signal in this case is shown together with the signal. Here again, the threshold th indicates the lowest level of the received light signal that allows the light receiving element 52 to detect light emission stably.

  Since the electronic pen 50 is located away from the image display device 30, the light energy per unit area of the light emission at the position of the electronic pen 50 is weak. However, as described above, the attachment 80 is attached to the electronic pen 50. The light receiving element 52 is located at a position substantially on the optical axis at the focal length. In this way, the light emitted from the position coordinate detection subfield is collected by the condenser lens 82 and is incident on the light receiving element 52, so that the light energy incident on the light receiving element 52 is increased. At this time, the light emission incident on the light receiving element 52 is limited to a region on the image display surface of the image display device 30 indicated by the finger of the electronic pen 50 as much as the area of the condenser lens 82.

  In addition, in this embodiment, the long-distance horizontal line Ly2 is an 8-pixel wide line extending in the horizontal direction, and the long-distance vertical line Lx2 is an 8-pixel wide line extending in the vertical direction. Therefore, the luminance of light emission in the remote y coordinate detection period Py2 and the remote x coordinate detection period Px2 is higher than the luminance of light emission in the proximity y coordinate detection period Py1 and the proximity x coordinate detection period Px1.

  Therefore, by attaching the attachment 80, even if the light emission of the proximity y coordinate detection subfield SFy1 or the light emission of the proximity x coordinate detection subfield SFx1 cannot be received, the light emission of the remote y coordinate detection subfield SFy2 and The light emitted from the remote x-coordinate detection subfield SFx2 can be received. Therefore, the light emission of the horizontal line Ly2 can be received at time tyy2 when the horizontal line Ly2 passes through the coordinates (x, y) of the image display surface pointed to by the electronic pen 50, and the light receiving element 52 receives a light reception signal indicating light reception at the time tyy2. Can be output. Further, the light emission of the vertical line Lx2 can be received at the time txx2 when the vertical line Lx2 passes the coordinates (x, y) of the image display surface pointed to by the electronic pen 50, and the light receiving element 52 receives the light reception signal indicating the reception of the time txx2. Can be output.

  As described above, by attaching the attachment 80, the electronic pen 50 can receive the light emission of the horizontal line Ly2 and the vertical line Lx2 emitted in the remote coordinate detection subfields SFy2 and SFx2, and indicates the image display device 30 indicated. The coordinates (x, y) on the display screen can be calculated.

  Here, assuming that the time from time ty02 to time ty2 is time Tyy2, the time from the time ty02 to the first application of the y coordinate detection pulse is time Ty02, and the cycle of applying the y coordinate detection pulse is time Ty12, the coordinate calculation unit 57 obtains the y-coordinate by multiplying the value obtained by dividing the time (Tyy2−Ty02) by the time Ty12 by a plurality of times, or by 8 in the present embodiment. Also, assuming that the time from time tx02 to time txx2 is time Txx2, the time from the time tx02 to the first application of the x coordinate detection pulse is time Tx02, and the cycle of applying the x coordinate detection pulse is time Tx12, the coordinate calculation unit 57 Is obtained by multiplying the value obtained by dividing the time (Txx2-Tx02) by the time Tx12 by a plurality of times, and in the present embodiment, multiplied by 8 to obtain the x coordinate. However, in this case, the position of the horizontal line moves by 8 pixels every time Ty12, and the position of the vertical line moves by 8 pixels every time Tx12, so the resolution becomes 8 pixels.

  Next, the drawing device 40 will be described in detail.

  The drawing apparatus 40 in FIG. 1 includes the coordinates (x, y) transmitted from the electronic pen 50, whether or not the attachment 80 is attached, the state of the drawing switch 51, the states of the other switches 68b and 68c, and the like. Based on the accompanying other information, an image signal is created and output to the image display device 30. This image signal is for displaying an image drawn by the user or displaying a cursor. The drawing device 40 includes a receiving unit 42 and a drawing unit 46.

  The receiving unit 42 decodes the radio signal sent from the transmitting unit 58 of the electronic pen 50 and outputs the coordinates (x, y) and other information to the drawing unit 46.

  The drawing unit 46 includes a frame memory 47 and creates a drawing signal indicating the locus of the electronic pen 50 on the image display surface based on the coordinates (x, y) received by the receiving unit 42 and other information, or electronic A drawing signal for displaying a cursor at the position indicated by the pen 50 is generated and output to the image display device 30.

  FIG. 20 is a schematic diagram showing an example of drawing of the image display system 100 in the embodiment of the present invention.

  First, a case where the attachment 80 is not attached will be described. If the drawing switch 51 is “OFF”, the drawing unit 46 writes the cursor pattern in the frame memory 47 around the pixel corresponding to the coordinates (x, y) transmitted from the electronic pen 50. When the user moves the position indicated by the electronic pen 50, the coordinates (x, y) transmitted from the electronic pen 50 also change. Then, the cursor pattern centered on the coordinates (x, y) in the previous field is deleted from the frame memory 47, and the cursor pattern centered on the coordinates (x, y) in the current field is written into the frame memory 47. Thus, the drawing unit 46 creates a drawing signal for displaying the cursor at the position indicated by the electronic pen 50.

  If the drawing switch 51 is “ON”, the drawing unit 46 draws a pattern such as a circle of a predetermined color and size around the pixel corresponding to the coordinates (x, y) transmitted from the electronic pen 50. Write to the frame memory 47. When the user moves the position indicated by the electronic pen 50, the coordinates (x, y) transmitted from the electronic pen 50 also change. Then, the predetermined pattern centered on the coordinates (x, y) in the current field is written into the frame memory 47 without erasing the predetermined pattern centered on the coordinates (x, y) in the previous field from the frame memory 47. . In this way, the drawing unit 46 creates a drawing signal indicating the locus of the electronic pen 50 on the image display surface as shown in FIG.

  Next, a case where the attachment 80 is attached will be described. The drawing unit 46 writes the cursor pattern in the frame memory 47 around the pixel corresponding to the coordinates (x, y) transmitted from the electronic pen 50. When the user moves the position indicated by the electronic pen 50, the coordinates (x, y) transmitted from the electronic pen 50 also change. Then, the cursor pattern centered on the coordinates (x, y) in the previous field is deleted from the frame memory 47, and the cursor pattern centered on the coordinates (x, y) in the current field is written into the frame memory 47. Thus, the drawing unit 46 creates a drawing signal for displaying the cursor at the position indicated by the electronic pen 50.

  When the attachment 80 is attached, not only the cursor is simply displayed on the image display device 30, but also drawing is performed using various switches 68c and the like attached to the electronic pen 50, or the display is performed in the same manner as a mouse. It is also possible to control the display image such as image switching.

  Then, the image signal processing unit 31 of the image display device 30 synthesizes the input image signal and the drawing signal output from the drawing unit 46 and converts them into image data indicating light emission / non-light emission for each subfield. As a result, the image or cursor drawn with the electronic pen 50 and the image of the input image signal are superimposed and displayed on the image display device 30.

  As described above, the image display system 100 according to the present embodiment indicates based on the image display device 30 in which one field period is configured by a plurality of subfields including the coordinate detection subfield, and the light emission of the coordinate detection subfield. An electronic pen 50 that calculates the coordinates of the image display surface, an electronic pen attachment 80 that is attached to the electronic pen 50, and a drawing device that generates a drawing signal based on the coordinates calculated by the electronic pen 50 and outputs the drawing signal to the image display device 30. 40.

  The image display device 30 simultaneously applies the y-coordinate detection pulse to the first number of scanning electrodes while applying the y-coordinate detection voltage Vdy to the image display subfield and the data electrodes D1 to Dm. The y coordinate detection subfield SFy1 for proximity that sequentially performs the operation to perform, and the y coordinate detection pulse simultaneously to the second number of scan electrodes that are larger than the first number while the y coordinate detection voltage Vdy is applied to the data electrodes D1 to Dm. Remote y-coordinate detection subfield SFy2 that sequentially applies the operation of applying x-coordinate, and the operation of simultaneously applying x-coordinate detection pulses to the third number of data electrodes while applying the x-coordinate detection voltage Vax to scan electrodes SC1 to SCn. The x-coordinate detection subfield SFx1 for proximity and the x-coordinate detection voltage Vax applied to the scan electrodes SC1 to SCn, which are sequentially applied, are larger than the third number. A remote for the x-coordinate detection subfield SFx2 sequentially performing an operation of applying the x-coordinate detection pulse simultaneously to the data electrodes in the number of, and one field period is formed of a plurality of subfields including. When the electronic pen attachment 80 is not attached, the electronic pen 50 calculates the y coordinate using the light emission of the proximity y coordinate detection subfield SFy1 and uses the light emission of the proximity x coordinate detection subfield SFx1 to calculate the x coordinate. When the electronic pen attachment 80 is mounted, the y coordinate is calculated using the light emission of the remote y coordinate detection subfield SFy2, and the x coordinate is calculated using the light emission of the remote x coordinate detection subfield SFx2. calculate.

  Accordingly, it is possible to provide an image display system that can draw from the image display surface in contact with or close to the image display device, and can display or draw the cursor on the image display surface away from the image display device.

  In the embodiment, a horizontal line is shown in which, in the y coordinate detection period Py1, the discharge cell rows are sequentially light-emitted one by one and moved from the upper end portion to the lower end portion of the image display surface. However, the present invention is not limited to this. For example, a horizontal line that moves by sequentially emitting light by two discharge cell rows may be displayed, or a horizontal line that moves by discharging every other discharge cell row may be displayed. Similarly, in the x-coordinate detection period Px1, the discharge cell rows may be caused to emit light sequentially in an arbitrary plurality of rows, or the discharge cell rows may be caused to emit light every other row. The same applies to the y-coordinate detection period Py2 and the x-coordinate detection period Px2. As a result, the luminance can be further reduced, and the time required for the y-coordinate detection subfields SFy1 and SFy2 and the x-coordinate detection subfields SFx1 and SFx2 can be shortened.

  In addition, the specific numerical values used in the embodiments are merely examples, and it is desirable to appropriately set the values appropriately according to the specifications of the electronic pen, the characteristics of the image display device, and the like.

  The present invention relates to an electronic pen attachment for detecting light emission for position coordinate detection of an image display device from a position away from the image display surface, and position coordinate detection of the image display device from a position in contact with or close to the image display surface. It is useful as an image display system having an electronic pen for detecting light emission.

DESCRIPTION OF SYMBOLS 10 Panel 30 Image display apparatus 40 Drawing apparatus 50 Electronic pen 52 Light receiving element 60 Body shaft 64 Neck shaft 67 Mating groove 70 Pen tip part 80,90 Attachment for electronic pens 81, 91 Body part 82 Condensing lens 84 Convex part 85,95 Node 94 Screw

Claims (6)

  1. A condensing lens at one end of the cylindrical body, and an opening having a mechanism for attaching to the electronic pen at the other end of the body,
    An attachment for an electronic pen, wherein light incident on the inside of the body portion through the condenser lens is condensed on the electronic pen.
  2. An electronic pen attachment to be attached to an electronic pen equipped with a light receiving element,
    A cylindrical body part, and a condenser lens held at one end of the body part,
    By attaching the other end of the body part to the pen tip side of the electronic pen, the light incident on the inside of the body part through the condenser lens is condensed on the light receiving element of the electronic pen. A featured electronic pen attachment.
  3. The attachment for an electronic pen according to claim 1, wherein the length of the body portion is set so that a light receiving element of the electronic pen is positioned at a position of a focal length on an optical axis of the condenser lens. .
  4. The attachment for electronic pens according to claim 1, wherein a node portion for pushing back a pen tip portion of the electronic pen to the inside of the electronic pen is provided inside the body portion.
  5. An image display device in which one field period is constituted by a plurality of subfields including a coordinate detection subfield, an electronic pen for calculating coordinates of an image display surface indicated based on light emission of the coordinate detection subfield, and attached to the electronic pen An image display system comprising: the electronic pen attachment according to claim 1; and a drawing device that generates a drawing signal based on coordinates calculated by the electronic pen and outputs the drawing signal to the image display device.
  6. The image display device includes an image display subfield for displaying an image, and a proximity operation for sequentially applying a y-coordinate detection pulse to the first number of scan electrodes while applying a y-coordinate detection voltage to the data electrode. A remote y-coordinate detection sub-field and an operation for sequentially applying y-coordinate detection pulses to a second number of scan electrodes greater than the first number while applying a y-coordinate detection voltage to the data electrodes. a y-coordinate detection subfield, a proximity x-coordinate detection subfield for sequentially performing an operation of simultaneously applying an x-coordinate detection pulse to a third number of data electrodes while applying an x-coordinate detection voltage to the scan electrode, and the scan electrode A remote x-coordinate detection sub-frame that sequentially applies an x-coordinate detection pulse to the fourth number of data electrodes larger than the third number while applying the x-coordinate detection voltage to the remote. One field period is formed of a plurality of subfields including a Rudo, a,
    When the electronic pen attachment is not attached, the electronic pen calculates the y coordinate using the light emission of the proximity y coordinate detection subfield and uses the light emission of the proximity x coordinate detection subfield to calculate the x coordinate. When the electronic pen attachment is mounted, the y coordinate is calculated using the light emission of the remote y coordinate detection subfield and the x coordinate is calculated using the light emission of the remote x coordinate detection subfield. The image display system according to claim 5, wherein the image display system is calculated.
JP2012220020A 2012-10-02 2012-10-02 Attachment for electronic pen and image display system Pending JP2015232739A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012220020A JP2015232739A (en) 2012-10-02 2012-10-02 Attachment for electronic pen and image display system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012220020A JP2015232739A (en) 2012-10-02 2012-10-02 Attachment for electronic pen and image display system
PCT/JP2013/005832 WO2014054268A1 (en) 2012-10-02 2013-10-01 Electronic pen attachment, electronic pen system, and image display system comprising electronic pen system

Publications (1)

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JP2015232739A true JP2015232739A (en) 2015-12-24

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JP2012220020A Pending JP2015232739A (en) 2012-10-02 2012-10-02 Attachment for electronic pen and image display system

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JP (1) JP2015232739A (en)
WO (1) WO2014054268A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2790965B2 (en) * 1992-08-19 1998-08-27 富士通株式会社 Optical pointing system
JP3690581B2 (en) * 1999-09-07 2005-08-31 株式会社ニコン Position detection device and method therefor, plain position detection device and method thereof
JP4821716B2 (en) * 2007-06-27 2011-11-24 富士ゼロックス株式会社 Electronic writing instruments, caps, computer systems
JP2009178935A (en) * 2008-01-30 2009-08-13 Fuji Xerox Co Ltd Electronic writing implement and cap

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