JP2014035394A - Driving method of image display device, image display device and image display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a cursor by intuitive operation on a pointer requiring no complicated works such as initial setting of cursor.SOLUTION: In the driving method of a plasma display panel, a subfield has: a writing period Pw in which write pulses are applied to data electrodes D1-Dm according to image signals and scan pulses are sequentially applied to scan electrodes SC1-SCn; and a maintenance period Ps in which maintenance pulses of the number according to a luminance weight are applied to the scan electrodes SC1-SCn and the maintenance electrodes SU1-SUn alternately to generate maintenance discharge. In a maintenance period Ps of a predetermined subfield SF1, time intervals To1, To2 and To3 of the discharge by three or more maintenance pulses which are continuously applied alternately are 2 times or more of time intervals of discharge by the maintenance pulses continuously applied alternately in the maintenance period Ps in a subfields SF2-SF8 other than the predetermined subfield and are the time intervals represented by a predetermined sequence.

Description

  The present invention relates to an image display apparatus driving method, an image display apparatus, and an image display system that can make a presentation while using one or more pointers to point an arbitrary position in an image display area with a cursor.

  A plasma display panel, which is a typical large-screen display device, has a large number of discharge cells formed between two glass substrates, and generates a gas discharge in the discharge cells to emit red, green, and blue fluorescence. The body is excited to emit light and color display is performed. As a method for driving a plasma display panel, a subfield method in which one field period is constituted by a plurality of subfields and gradation display is performed by a combination of subfields to emit light is generally used.

  In recent years, an image display system capable of giving a presentation using such a plasma display panel while pointing an arbitrary position in an image display area with a cursor has been studied. For example, Patent Literature 1 describes a presentation support apparatus that includes an acceleration sensor orthogonal to each other and a signal processing unit that controls a cursor on an image display surface in response to an acceleration signal. Patent Document 2 describes a projector that operates a cursor projected on a screen by moving a pointer having an acceleration sensor that detects acceleration in the front-rear direction and the width direction and detects an inclination in space. Yes.

JP-A-8-95539 JP 2007-248710 A

  In such an image display system, there is a demand to display various menu screens on the screen of the image display device and to control the image display system by selecting a menu with a cursor. When operating the cursor using the pointer, if there is a large difference between the direction indicated by the pointer and the position of the cursor displayed on the screen, it will feel uncomfortable during use. In order to correct such a positional deviation of the cursor, for example, the cursor position may be initialized before the pointer is used. However, such an initial setting operation of the cursor position is complicated.

  The present invention has been made in view of the above-described problems, and can display an image that can be controlled by an intuitive operation of the pointer without performing complicated work such as initial setting work of the cursor and without degrading the quality of image quality. An object of the present invention is to provide a device driving method, an image display device, and an image display system.

  In order to achieve the above object, according to the present invention, one field period is composed of a plurality of subfields, and each discharge cell having a scan electrode, a sustain electrode, and a data electrode is caused to emit or not emit light for each subfield. The subfield includes an address period in which an address pulse is applied to the data electrode according to an image signal and a scan pulse is sequentially applied to the scan electrode, a scan electrode and a sustain electrode, Discharge with three or more sustain pulses applied alternately and continuously in a sustain period of a predetermined subfield, with a sustain period in which a number of sustain pulses corresponding to the luminance weight are alternately applied to generate a sustain discharge. Discharge time by sustain pulses applied alternately in the sustain period of subfields other than the predetermined subfield. Interval is more than twice, and characterized in that it is a time interval represented by a predetermined sequence set in advance. By this method, it is possible to provide a driving method of an image display apparatus capable of controlling the cursor by an intuitive operation of the pointer without performing complicated work such as initial setting work of the cursor and without degrading the quality of the image quality. it can.

  Further, it is desirable that the predetermined subfield of the driving method of the image display apparatus of the present invention is a subfield having the smallest luminance weight or a subfield having the second smallest luminance weight.

  The present invention also provides a plasma display panel having a plurality of discharge cells each having a scan electrode, a sustain electrode, and a data electrode, and one field period is composed of a plurality of subfields, and each discharge cell emits light or does not emit light for each subfield. An image display device comprising: a drive circuit configured to display an image; and the drive circuit applies a subfield, a write pulse to the data electrode according to an image signal, and sequentially applies a scan pulse to the scan electrode At least one of a plurality of subfields, and a sustain period in which a sustain discharge of a number corresponding to the luminance weight is alternately applied to the scan electrode and the sustain electrode to generate a sustain discharge. In the sustain period of the predetermined subfield, the discharge time interval by three or more sustain pulses applied alternately and continuously is set. In a sustain period of a subfield other than a predetermined subfield, the time interval is at least twice the time interval of discharge by sustain pulses applied alternately and continuously, and the time interval shown by a predetermined number sequence is set. The sustain pulse is set. With this configuration, it is possible to provide an image display device capable of controlling the cursor by an intuitive operation of the pointer without performing complicated work such as initial setting work of the cursor.

  An image display system according to the present invention outputs an identification signal indicating detection of an identification discharge that emits light at a time interval indicated by a predetermined number sequence, and moves the cursor, together with the image display device described above. The image processing apparatus includes: a pointer that outputs a motion signal; and an image signal control device that inputs an identification signal and a motion signal to generate an image signal for displaying a cursor and outputs the image signal to an image display device. With this configuration, it is possible to provide an image display system capable of controlling the cursor by an intuitive operation of the pointer without performing complicated work such as the initial setting work of the cursor and without degrading the quality of image quality.

  According to the present invention, a driving method of an image display apparatus and an image display capable of controlling a cursor by an intuitive operation of a pointer without performing complicated work such as initial setting work of the cursor and without degrading image quality. An apparatus and an image display system can be provided.

It is a disassembled perspective view of the panel of the image display system in embodiment of this invention. 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 circuit block diagram of the image display system. It is a schematic diagram which shows an example of operation | movement of the image display system. It is a schematic diagram which shows an example of operation | movement of the image display system. It is a schematic diagram which shows an example of operation | movement of the image display system. It is a schematic diagram which shows an example of operation | movement of the image display system. It is a schematic diagram which shows an example of operation | movement of the image display system. It is a schematic diagram which shows an example of operation | movement of the image display system. It is a drive voltage waveform figure applied to the panel of the image display system in other embodiments of the present invention.

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

(Embodiment)
The image display system includes an image display device, a pointer that operates a cursor displayed on the image display device, and an image signal control device that generates an image signal for displaying the cursor and outputs the image signal to the image display device. First, a plasma display panel (hereinafter abbreviated as “panel”) used in an image display device and a driving method thereof will be described.

  FIG. 1 is an exploded perspective view of panel 10 used in the image display system according to the embodiment of the present invention. A plurality of scan electrodes 12 and sustain electrodes 13 are formed in parallel on the glass front substrate 11, and a dielectric layer 15 and a protective layer 16 are formed so as to cover them. A plurality of data electrodes 22 are formed on the rear substrate 21, and a dielectric layer 23 and a grid-like partition wall 24 are formed thereon. On the side surface of the partition wall 24 and on the dielectric layer 23, a phosphor layer 25 that emits light of each color of red, green, and blue is provided.

  The front substrate 11 and the rear substrate 21 are disposed facing each other and sealed, and a discharge gas is sealed in an internal discharge space. The discharge space is partitioned into a plurality of sections by barrier ribs 24, and discharge cells are formed at the intersections of scan electrodes 12, sustain electrodes 13, and data electrodes 22. These discharge cells discharge and emit light to display an image.

  FIG. 2 is an electrode array diagram of panel 10 used in the image display system according to 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 are arranged in the column direction. The extended m data electrodes D1 to Dm (data electrode 22 in FIG. 1) 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.

  Next, a method for driving the panel 10 will be described in detail. In order to drive the panel 10, one field period is composed of a plurality of subfields, and each discharge field having a scan electrode, a sustain electrode, and a data electrode is caused to emit or not emit light for each subfield to display an image. . Each subfield has an address period in which an address pulse is applied to the data electrode in accordance with the image signal and a scan pulse is sequentially applied to the scan electrode, and a number corresponding to the luminance weight is alternately maintained between the scan electrode and the sustain electrode. And a sustain period for generating a sustain discharge by applying a pulse.

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

  However, in the present embodiment, a sustain discharge that emits light in a unique pattern of the image display device is generated in the sustain period of subfield SF1.

  FIG. 3 is a waveform diagram of a driving voltage applied to panel 10 of the image display system in the embodiment of the present invention.

  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, voltage Ve is applied to sustain electrodes SU1 to SUn, and a downward ramp voltage that drops from voltage 0 (V) to voltage Vi4 is applied to scan electrodes SC1 to SCn. 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.

  In the subsequent address period Pw, voltage Vc is applied to each of scan electrodes SC1 to SCn while voltage Ve is applied to sustain electrodes SU1 to SUn.

  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 cell to which the address pulse is applied, and a predetermined wall voltage is accumulated on scan electrode SC1 and sustain electrode SU1. On the other hand, no address discharge occurs in the discharge cells to which no address pulse is 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, an address discharge is generated in the discharge cell to which the address pulse is applied, and a predetermined wall voltage is accumulated on scan electrode SC2 and sustain electrode SU2.

  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.

  Thereafter, the voltage 0 (V) is applied to the data electrodes D1 to Dm, and the voltage Vc is applied to each of the scan electrodes SC1 to SCn. This state is maintained from time to0 when the last address discharge is generated to time To0. The time To0 is set longer than the time To1, the time To2, and the time To3 described later, and is 50 μs, for example, in the present embodiment.

  In the subsequent sustain period Ps, the sustain pulse A of the voltage Vs is applied to the scan electrodes SC1 to SCn and the voltage 0 is applied to the sustain electrodes SU1 to SUn at the time to1 after the time To0 has elapsed from the time to0 when the last address discharge was generated. Apply (V). Then, a sustain discharge occurs in the discharge cell that has caused the address discharge in the immediately preceding address period Pw, and the phosphor layer 25 emits light. Then, the polarities of the wall voltage on scan electrode SCi and the wall voltage on sustain electrode SUi are reversed. On the other hand, no sustain discharge occurs in the discharge cells where no address discharge has occurred. Next, at time to2 after time To1 has elapsed from time to1, voltage 0 (V) is applied to scan electrodes SC1 to SCn and sustain pulse B of voltage Vs is applied to sustain electrodes SU1 to SUn. Then, in the discharge cell in which the sustain discharge has occurred, the sustain discharge occurs again and the phosphor layer 25 emits light, and the polarity of the wall voltage on the scan electrode SCi and the wall voltage on the sustain electrode SUi is reversed. Next, at time to3 after time To2 has elapsed from time to2, a sustain pulse C is applied to scan electrodes SC1 to SCn, and voltage 0 (V) is applied to sustain electrodes SU1 to SUn to cause a sustain discharge. A third sustain discharge is generated in the cell. Subsequently, at time to4 after time To3 has elapsed from time to3, voltage 0 (V) is applied to scan electrodes SC1 to SCn and sustain pulse D is applied to sustain electrodes SU1 to SUn to cause a sustain cell. The fourth sustain discharge is generated.

  The four consecutive sustain discharges described above are distinguished from other sustain discharges and are referred to as “identification discharges”. Here, time To1, time To2, and time To3, which are each time interval of discharge by four sustain pulses applied alternately and continuously, are predetermined time intervals as unique patterns of the image display device. Then, as will be described later, it is possible to identify light emission of the image display device by detecting four discriminating discharges generated at intervals of time To1, time To2, and time To3. In the present embodiment, time To1, time To2, and time To3 are, for example, 40 μs, 20 μs, and 30 μs, respectively.

  Then, at the end of sustain period Ps, an upward ramp voltage rising from voltage 0 (V) to voltage Vr is applied to scan electrodes SC1 to SCn. 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 sustain electrode SUi is weakened.

  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.

  Since the operation in the writing period Pw of the subfield SF2 is substantially the same as the operation in the writing period Pw of the subfield SF1, description thereof is omitted.

  In sustain period Ps of subfield SF2, 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, and the phosphor layer 25 emits light. Then, the polarities of the wall voltage on scan electrode SCi and the wall voltage on sustain electrode SUi are reversed. On the other hand, no sustain discharge occurs in the discharge cells where no address discharge has occurred. 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 in which the sustain discharge has occurred, and the phosphor layer 25 emits light. Similarly, the number of sustain pulses corresponding to the luminance weight, in this embodiment, the number of sustain pulses obtained by multiplying the weight of each subfield by 4 is set to the scan electrodes SC1 to SCn and the sustain electrodes SU1 to SUn at a constant time interval. The sustain discharge is continuously generated in the discharge cells in which the address discharge is caused to be applied alternately.

  The fixed time interval is set longer than the time until one sustain discharge occurs and converges, and short enough to apply the necessary number of sustain pulses within one field period. . In the present embodiment, sustain pulses are applied to scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn at regular time intervals so that the discharge time interval by the sustain pulses applied alternately and continuously becomes 2.5 μs. Is applied.

  At the end of sustain period Ps, a weak erasing discharge is generated by applying an upward ramp voltage rising from voltage 0 (V) to voltage Vr to scan electrodes SC1 to SCn.

  The operations of the initialization period Pi and the write period Pw of the subfield SF3 are substantially the same as the operations of the initialization period Pi and the write period Pw of the subfield SF2. The operation in the sustain period Ps of the subfield SF3 is substantially the same as the operation in the sustain period Ps of the subfield SF2 except for the number of sustain pulses, and the discharge time interval by the sustain pulses applied alternately and continuously is the same. Sustain pulses are applied to scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn at regular time intervals so as to be 2.5 μs. The operations of subfields SF4 to SF8 are substantially the same as those of subfield SF2 and subfield SF3 except for the number of sustain pulses.

  As described above, the driving method of the image display apparatus is characterized in that, among the subfields having the address period and the sustain period, the discharge by the three or more sustain pulses applied alternately and continuously in the sustain period of the predetermined subfield. The time interval is at least twice the time interval of the discharge by the sustain pulse applied alternately and continuously in the sustain period of the subfield other than the predetermined subfield, and the time interval indicated by a predetermined number sequence It is. In the present embodiment, the predetermined subfield is a subfield SF1 driven at the beginning of one field, and the time interval of discharge by four sustain pulses applied alternately and continuously in the sustain period is a predetermined subfield. In the sustain period of subfields SF2 to SF8, which are other subfields, the discharge time interval by the sustain pulse applied alternately and continuously is twice or more than 2.5 μs. This is for reliably separating and detecting each of the consecutively generated identification discharges.

  The time interval is a time interval indicated by a predetermined number sequence (40, 20, 30). That is, time To1, time To2, and time To3 are 40 μs, 20 μs, and 30 μs, respectively.

  In this embodiment, voltage values applied to the electrodes are, for example, voltage Vi1 = 150 (V), voltage Vi2 = 350 (V), voltage Vi4 = −175 (V), voltage Va = −200 (V). , Voltage Vc = −50 (V), voltage Vs = 205 (V), voltage Vr = 205 (V), voltage Ve = 155 (V), and voltage Vd = 55 (V). However, these voltage values are only examples. The drive voltage waveform shown in FIG. 3 is only an example. These are preferably set to the optimum drive voltage waveform and voltage value as appropriate in accordance with the characteristics of the panel 10 and the like.

  Next, the configuration of the image display system will be described.

  FIG. 4 is a circuit block diagram of image display system 100 in the embodiment of the present invention. The image display system 100 includes an image display device 30, an image signal control device 40, and a pointer 50. A plurality of pointers 50 may be provided as shown in FIG.

  As described above, the image display device 30 configures one field period with the subfields SF1 to SF8 and displays an image. The image display device 30 is necessary for the panel 10, the image signal processing unit 31, the data electrode driving unit 32, the scanning electrode driving unit 33, the sustain electrode driving unit 34, the timing generation unit 35, and each circuit block. A power supply unit (not shown) for supplying power.

  The image signal processing unit 31 converts the image signal output from the image signal control device 40 into image data indicating light emission / non-light emission for each subfield. Further, the horizontal and vertical synchronization signals are separated and supplied to the timing generator 35. The data electrode drive unit 32 converts the image data into address pulses corresponding to the data electrodes D1 to Dm and applies them to the data electrodes D1 to Dm.

  The timing generator 35 generates various timing signals for controlling the operation of each circuit block based on the synchronization signal, and supplies the timing signals to the respective circuit blocks. Scan electrode driver 33 applies the drive voltage shown in FIG. 3 to each of scan electrodes SC1 to SCn based on the timing signal, and sustain electrode driver 34 maintains the drive voltage shown in FIG. 3 based on the timing signal. Applied to the electrodes SU1 to SUn.

  The pointer 50 is used to operate a cursor displayed on the image display device 30 and includes a selection switch 51, a light receiving unit 52, an identification unit 54, a motion sensor 56, and a transmission unit 58.

  The selection switch 51 is depressed when displaying a menu and a cursor on the image display device 30, and is also depressed when selecting a menu. Then, a selection signal S1 that becomes “H” level when pressed down is output to the transmitter 58.

  The light receiving unit 52 receives light emitted from the image display device 30 and outputs a light reception signal to the identification unit 54.

  The identifying unit 54 identifies the identified discharge in the subfield SF1 by detecting, from the received light signal, light emission generated at a time interval indicated by a predetermined number sequence determined in advance. Specifically, four consecutive light emission intervals of light emission intervals of time To1, time To2, and time To3 are searched for from the received light signal. When four consecutive light emissions are detected, the identification signal S2 indicating the detection of the image display device 30 is set to the “H” level and output to the transmission unit 58. If four consecutive light emissions cannot be detected, the identification signal S2 is set to the “L” level and output to the transmitter 58.

  The motion sensor 56 includes a triaxial acceleration sensor and a triaxial gyro sensor. The vertical direction is estimated from the average value of the output of each axis of the triaxial acceleration sensor. Further, a change in the direction indicated by the pointer 50 is estimated based on the difference from the average value of the output of the 3-axis gyro sensor and the output of the 3-axis acceleration sensor, and a motion signal (δX) indicating the amount of movement of the cursor in the horizontal and vertical directions. , ΔY) is calculated and output to the transmitter 58. Here, δX indicates the amount of movement in the horizontal direction, and δY indicates the amount of movement in the vertical direction.

  In the present embodiment, the speed of change in the direction indicated by the pointer 50 is calculated, and the motion signals (δX, δY) are calculated in proportion thereto.

  The transmission unit 58 encodes the pointer number S0, the selection signal S1, the identification signal S2, and the motion signal (δX, δY), which are independently assigned to each of the pointers 50, to the image signal control device 40 by radio signals. Send.

  Thus, the pointer 50 has a pointer number S0, a selection signal S1, an identification signal S2 indicating detection of an identification discharge that emits light at a predetermined time interval indicated by a predetermined number sequence, and a motion signal (δX) for moving the cursor. , ΔY) to the image signal control device 40.

  The image signal control device 40 creates a cursor image signal for displaying a cursor and an on-screen image signal for displaying an on-screen based on various signals sent from the pointer 50, and an image to be displayed. The image signal, the cursor image signal, and the on-screen image signal are combined and output to the image display device 30. The image signal control device 40 includes a receiving unit 41, an image signal control unit 42, a cursor signal creation unit (hereinafter abbreviated as “C signal creation unit”) 43, and an on-screen signal creation unit (hereinafter “OS signal”). 44) (abbreviated as “creation unit”) and an image signal synthesis unit 46.

  The receiving unit 41 decodes the radio signal transmitted from the pointer 50 and reproduces the pointer number S0 of the pointer 50, the selection signal S1, the identification signal S2, and the motion signal (δX, δY). Since these pieces of information are sent from time to time for each field, a time parameter t is added below, and a selection signal S1 (t), an identification signal S2 (t), a motion signal (δX (t), δY (T)) etc.

  The image signal control unit 42 is based on various signals output from the reception unit 41, the cursor position coordinates output from the C signal generation unit 43, and the on-screen coordinates output from the OS signal generation unit 44. The C signal generation unit 43, the OS signal generation unit 44, and the image signal synthesis unit 46 are controlled.

  The C signal creation unit 43 includes a coordinate memory that stores the coordinates of the cursor corresponding to each of the pointers 50, and a frame memory that stores a cursor image signal. Then, for each field, the pointer number S0, the selection signal S1 (t), the identification signal S2 (t), and the motion signals (δX (t), δY (t)) are input, and the cursor corresponding to each of the pointers 50 is input. Coordinates are set and written to the coordinate memory, and a cursor image signal for displaying each cursor is written to the frame memory.

  In the present embodiment, the C signal creation unit 43 performs the following operation when the cursor display mode is set.

  When the identification signal S2 (t-1) in the immediately preceding field is at "H" level and the identification signal S2 (t) in the current field is also at "H" level, that is, the pointer 50 performs identification discharge in the immediately preceding field. If the detected discharge is detected even in the current field, the C signal generation unit 43 is centered on the coordinates (X (t-1), Y (t-1)) of the cursor in the immediately preceding field. Erase the cursor image from the frame memory. The coordinates obtained by adding the motion signals (δX (t), δY (t)) to the coordinates (X (t−1), Y (t−1)) in the immediately preceding field are used as the coordinates (X (T), Y (t)) is written in the coordinate memory. That is, (X (t), Y (t)) = (X (t−1) + δX (t), Y (t−1) + δY (t)). Further, the cursor image centered on the coordinates (X (t), Y (t)) in the current field is written into the frame memory.

  When the identification signal S2 (t-1) in the immediately preceding field is at the "H" level and the identification signal S2 (t) in the current field is shifted to the "L" level, that is, the pointer 50 is identified discharge in the immediately preceding field. Is detected, but the identification discharge is not detected in the current field, the C signal generator 43 determines the coordinates (X (t−1), Y (t−1)) of the cursor in the immediately preceding field. Delete the image of the cursor at the center from the frame memory. Then, the coordinates of the cursor in the current field are not set. Since the cursor coordinates are not set, the cursor image in the current field is not written into the frame memory.

  When the identification signal S2 (t-1) in the previous field is at the "L" level and the identification signal S2 (t) in the current field is also at the "L" level, that is, the pointer 50 performs the identification discharge in the previous field. If no identification discharge is detected in the current field without detection, the C signal generator 43 holds the coordinates of the cursor in the current field unset. Therefore, the cursor image in the current field is not written into the frame memory.

  When the identification signal S2 (t-1) in the immediately preceding field is at the "L" level and the identification signal S2 (t) in the current field has transitioned to the "H" level, that is, the pointer 50 is identified in the immediately preceding field. When the discharge is not detected and the discriminating discharge is detected in the current field, the C signal generation unit 43 uses the coordinates (Xo, Yo) of the center of the image display surface as the coordinates of the cursor (X ( t) and Y (t)) are set and written in the coordinate memory. That is, (X (t), Y (t)) = (Xo, Yo). Then, the cursor image centered on the coordinates (X (t), Y (t)) in the current field is written into the frame memory.

  When there are a plurality of pointers 50, the above operation is performed on the radio signals transmitted from the respective pointers 50.

  The C signal generation unit 43 outputs the cursor coordinates of each pointer 50 stored in the coordinate memory to the image signal control unit 42 and outputs the cursor image signal stored in the frame memory to the image display device 30. To do.

  The OS signal creation unit 44 creates an on-screen image signal to be displayed and outputs it to the image display device 30 in accordance with the control signal, and outputs the coordinates of each part of the created on-screen image to the image signal control unit 42. Output.

  The image signal combining unit 46 selects an image signal to be displayed according to the control signal, combines the selected image signal, the on-screen image signal, and the cursor image signal, and outputs them to the image display device 30.

  Thus, the image signal control device 40 inputs the pointer number S0, the selection signal S1 (t), the identification signal S2 (t), and the motion signals (δX (t), δY (t)) to display the cursor. An image signal to be generated is generated, an on-screen image signal is generated, the selected image signal, the on-screen image signal, and the cursor image signal are combined and output to the image display device 30.

  Next, an example of the operation of the image display system 100 will be described.

  5A to 5F are operation explanatory diagrams of the image display system 100 according to Embodiment 1 of the present invention. As shown in FIG. 5A, in a state where an image is displayed on the image display device 30, the user presses the selection switch 51 with the tip of the pointer 50 facing the image display surface. At this time, if any image is displayed on the image display surface, there is a high probability that an identification discharge has occurred even in the subfield SF1, and therefore the identification signal S2 (t) transmitted from the pointer 50 transitions to the “H” level. . Then, the C signal generation unit 43 sets the coordinates (Xo, Yo) at the center of the image display surface as the coordinates (X (t), Y (t)) of the cursor in the current field, and writes them in the coordinate memory. Then, an image of the cursor centered on these coordinates is written into the frame memory. The OS signal creation unit 44 creates a menu screen for the main menu (top-level menu). Therefore, as shown in FIG. 5B, a cursor and a main menu are displayed on the image display surface.

  However, when the tip of the pointer 50 is not directed toward the image display surface, the light receiving unit 52 cannot receive the identification light emission, so that the cursor is not displayed and the menu is not displayed even when the selection switch 51 is pressed. Therefore, the cursor is displayed at the center of the image display surface only when the tip of the pointer 50 is directed toward the image display surface, and the pointer can be operated without performing complicated work such as initial setting work of the cursor. There is no significant deviation between the direction indicated by and the position of the displayed cursor.

  Next, as shown in FIG. 5C, the user moves the cursor to the desired menu position on the menu screen and depresses the selection switch 51.

  The image signal controller 42 uses the on-screen coordinates output from the OS signal generator 44 and the cursor position coordinates output from the C signal generator 43 when the selection switch 51 is pressed. The menu selected by the user is determined and the menu is executed.

  For example, if the menu selected by the user is input switching, the image signal synthesis unit 46 switches the output image signal. At this time, as shown in FIG. 5D, the OS signal creation unit 44 may create a submenu for image signal operation.

  Also, for example, if the menu selected by the user is the presentation mode, as shown in FIG. 5E, the image signal combining unit 46 outputs an image signal for presentation, and the OS signal creating unit 44 is a submenu for presentation. Create

  Further, for example, if the menu selected by the user is the drawing mode, as shown in FIG. 5F, the image signal synthesizing unit 46 outputs an image signal for drawing, and the OS signal generating unit 44 sets the submenu for drawing. Create

  The drawing mode can be realized as follows using, for example, the C signal generation unit 43. When displaying the cursor, move the cursor by overwriting the cursor image centered on the coordinates in the current field without erasing the cursor image centered on the coordinates in the previous field. A drawing signal for displaying a line as a trajectory can be created.

  As described above, in the image display system 100 according to the present embodiment, if the selection switch 51 is pressed, the cursor is displayed only when the tip of the pointer 50 faces the image display surface. The cursor can be displayed without causing a large shift between the direction indicated by the pointer and the position of the displayed cursor without performing complicated work such as initial setting work. If the cursor is to be moved quickly, the tip of the pointer 50 may be moved quickly. If the cursor is to be moved slowly, the tip of the pointer 50 may be moved slowly.

  Thus, the user can operate the cursor by performing an intuitive operation of moving the tip of the pointer 50 in accordance with the display, deletion, and movement of the cursor.

  In the present embodiment, the predetermined subfield for generating the identification discharge is the subfield SF1, and it has been described that only the identification light emission is performed in the sustain period of the subfield SF1, but the normal subfield SF1 is maintained in the sustain period of the subfield SF1. Both the sustain light emission and the identification light emission may be performed, or the identification light emission may be performed in the sustain period of the subfield other than the subfield SF1.

  FIG. 6 is a waveform diagram of drive voltages applied to panel 10 of the image display system according to another embodiment of the present invention. Also for the drive voltage waveform shown in FIG. 6, one field period is composed of eight subfields SF1 to SF8. However, in the drive voltage waveform shown in FIG. 6, an identification discharge that emits light in a unique pattern of the image display device is generated in the sustain period of the subfield SF2.

  In the sustain period Ps of the subfield SF2, first, a number smaller by “4” than the sustain pulse number “8” corresponding to the luminance weight to be arranged in the subfield SF2 of the image display device of the present embodiment. Pulses are alternately applied to scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn at a constant time interval so that the discharge time interval by the sustain pulse is 2.5 μs, and the discharge cells in which address discharge has occurred Sustain discharge is generated continuously.

  Thereafter, at time to1 after time To0 has elapsed from time to0 when the last sustain pulse is applied, voltage Vs sustain pulse E is applied to scan electrodes SC1 to SCn, and then time to2 after time To1 has elapsed from time to1. , The sustain pulse F of the voltage Vs is applied to the sustain electrodes SU1 to SUn, and then the sustain pulse G is applied to the scan electrodes SC1 to SCn at time to3 after the lapse of time To2 from time to2, and then from time to3. At time to4 after elapse of time To3, sustain pulse H is applied to sustain electrodes SU1 to SUn.

  Thus, in the sustain period of the subfield SF2, after the normal sustain discharge is generated, four consecutive discriminating discharges are generated.

  As described above, in the image display device according to the present embodiment, identification light emission may be performed together with the sustain discharge for image display in an arbitrary period in the sustain period of an arbitrary subfield. By causing the identification light emission during the sub-field maintaining period for image display, light emission for other than the image display does not occur, so that high-quality display can be performed while suppressing a decrease in contrast. Also, in order to cause discriminative light emission frequently, a subfield having a small luminance weight has a higher probability of generating a sustain discharge than a subfield having a large luminance weight, so that an identification discharge is generated in a subfield having a small luminance weight. It is desirable. Therefore, it is desirable that the predetermined subfield for generating the identification discharge is the subfield having the smallest luminance weight or the subfield having the second smallest luminance weight.

  As described above, it is also possible to provide a subfield for generating identification discharge irrespective of image display to generate identification discharge not related to image display. However, in order to prevent a decrease in contrast of the display image due to light emission in the black display region on the image display surface, the image display is performed in a maintenance period of a predetermined subfield among a plurality of subfields for displaying an image. It is desirable to generate an identification discharge together with a sustain discharge for the purpose.

  Note that each circuit block described in the present embodiment may be configured as an electric circuit, or may be configured using a processor or the like programmed to perform the same operation.

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

  According to the present invention, it is possible to display a high-quality image and to control the cursor by an intuitive operation of the pointer without performing complicated work such as initial setting work of the cursor, so that the cursor is displayed on the image display device. This is useful as an image display system having a pointer to be operated.

DESCRIPTION OF SYMBOLS 10 Panel 12 Scan electrode 13 Sustain electrode 22 Data electrode 30 Image display apparatus 40 Image signal control apparatus 41 Reception part 42 Image signal control part 43 C signal preparation part 44 OS signal preparation part 46 Image signal composition part 50 Pointer 51 Selection switch 52 Light reception Part 54 Identification part
56 motion sensor 58 transmitter 100 image display system

Claims (4)

A method for driving an image display apparatus, in which one field period is composed of a plurality of subfields, and each discharge cell having a scan electrode, a sustain electrode, and a data electrode emits or does not emit light for each subfield. There,
In the subfield, an address pulse is applied to the data electrode in accordance with an image signal and a scan pulse is sequentially applied to the scan electrode, and a luminance weight is alternately applied to the scan electrode and the sustain electrode. A sustain period for generating a sustain discharge by applying a number of sustain pulses,
In the sustain period of at least one or more predetermined subfields among the plurality of subfields, the discharge time interval by three or more sustain pulses applied alternately and continuously is a sub-field other than the predetermined subfield. An image display device characterized in that it is at least twice the time interval of discharge by sustain pulses applied alternately and continuously in a sustain period of a field, and is a time interval indicated by a predetermined number sequence. Driving method. The method according to claim 1, wherein the predetermined subfield is a subfield having the smallest luminance weight or a subfield having the second smallest luminance weight. A plasma display panel having a plurality of discharge cells each having a scan electrode, a sustain electrode, and a data electrode, and one field period is composed of a plurality of subfields, and each of the discharge cells emits or does not emit light for each subfield. An image display device comprising: a drive circuit for displaying
The drive circuit is
The subfield is applied in response to the luminance weight alternately between the address period in which an address pulse is applied to the data electrode in accordance with an image signal and the scan pulse is sequentially applied to the scan electrode, and the scan electrode and the sustain electrode. A sustain period for generating a sustain discharge by applying a number of sustain pulses,
In the sustain period of at least one or more predetermined subfields among the plurality of subfields, the discharge time interval by three or more sustain pulses applied alternately and continuously is a sub-field other than the predetermined subfield. The sustain pulse is set so that it is at least twice the time interval of discharge by the sustain pulse applied alternately and continuously in the sustain period of the field, and the time interval shown by a predetermined number sequence determined in advance. An image display device characterized by that. An image display device according to claim 3, and a pointer that outputs an identification signal indicating detection of an identification discharge that emits light at a time interval indicated by a predetermined number sequence and outputs a motion signal for moving the cursor. An image display system comprising: an image signal control device that inputs the identification signal and the motion signal, generates an image signal for displaying the cursor, and outputs the image signal to the image display device.

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