WO2011111337A1 - プラズマディスプレイ装置およびプラズマディスプレイシステム - Google Patents
プラズマディスプレイ装置およびプラズマディスプレイシステム Download PDFInfo
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- WO2011111337A1 WO2011111337A1 PCT/JP2011/001204 JP2011001204W WO2011111337A1 WO 2011111337 A1 WO2011111337 A1 WO 2011111337A1 JP 2011001204 W JP2011001204 W JP 2011001204W WO 2011111337 A1 WO2011111337 A1 WO 2011111337A1
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- eye
- field
- subfield
- shutter
- plasma display
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
- G09G3/003—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
- H04N13/341—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using temporal multiplexing
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
Definitions
- the present invention relates to a plasma display device and a plasma display system for stereoscopically displaying right-eye images and left-eye images displayed alternately on a plasma display panel using shutter glasses.
- a typical AC surface discharge type panel as a plasma display panel (hereinafter abbreviated as “panel”) has a large number of discharge cells formed between a front substrate and a rear substrate that are arranged to face each other.
- a plurality of pairs of display electrodes composed of a pair of scan electrodes and sustain electrodes are formed on the front glass substrate in parallel with each other.
- a dielectric layer and a protective layer are formed so as to cover the display electrode pairs.
- the back substrate has a plurality of parallel data electrodes formed on the glass substrate on the back side, a dielectric layer is formed so as to cover the data electrodes, and a plurality of barrier ribs are formed thereon in parallel with the data electrodes. ing. And the fluorescent substance layer is formed in the surface of a dielectric material layer, and the side surface of a partition.
- the front substrate and the rear substrate are arranged opposite to each other and sealed so that the display electrode pair and the data electrode are three-dimensionally crossed.
- a discharge gas containing xenon at a partial pressure ratio of 5% is sealed, and a discharge cell is formed in a portion where the display electrode pair and the data electrode face each other.
- ultraviolet rays are generated by gas discharge in each discharge cell, and the phosphors of each color of red (R), green (G) and blue (B) are excited and emitted by the ultraviolet rays. Display an image.
- the subfield method is generally used as a method for driving the panel.
- one field is divided into a plurality of subfields, and gradation display is performed by causing each discharge cell to emit light or not emit light in each subfield.
- Each subfield has an initialization period, an address period, and a sustain period.
- an initialization waveform is applied to each scan electrode, and an initialization discharge is generated in each discharge cell.
- wall charges necessary for the subsequent address operation are formed, and priming particles (excited particles for generating the discharge) for generating the address discharge stably are generated.
- the scan pulse is sequentially applied to the scan electrodes, and the address pulse is selectively applied to the data electrodes based on the image signal to be displayed.
- an address discharge is generated between the scan electrode and the data electrode of the discharge cell to emit light, and a wall charge is formed in the discharge cell (hereinafter, these operations are also collectively referred to as “address”). ).
- the number of sustain pulses based on the luminance weight determined for each subfield is alternately applied to the display electrode pairs composed of the scan electrodes and the sustain electrodes.
- a sustain discharge is generated in the discharge cell that has generated the address discharge, and the phosphor layer of the discharge cell emits light (hereinafter referred to as “lighting” that the discharge cell emits light by the sustain discharge, and “non-emitting”. Also written as “lit”.)
- each discharge cell is made to emit light with the luminance according to the luminance weight.
- each discharge cell of the panel is caused to emit light with a luminance corresponding to the gradation value of the image signal, and an image is displayed in the image display area of the panel.
- 3D image a three-dimensional (3 dimension: hereinafter referred to as “3D”) image (hereinafter referred to as “3D image”) capable of stereoscopic viewing is displayed on such a panel, and a plasma display device as a 3D image display device.
- the method of using is also studied.
- One 3D image is composed of one right-eye image and one left-eye image.
- this plasma display device when a 3D image is displayed on the panel, the right-eye image and the left-eye image are alternately displayed on the panel.
- the user displays on the panel using special glasses called shutter glasses in which the left and right shutters are alternately opened and closed in synchronization with the field for displaying the image for the right eye and the field for displaying the image for the left eye.
- the 3D image that is displayed is viewed (for example, see Patent Document 1).
- the shutter glasses include a right-eye shutter and a left-eye shutter, and the right-eye shutter is opened (a state in which visible light is transmitted) during a period in which the right-eye image is displayed on the panel, and the left-eye shutter. Is closed (a state in which visible light is blocked), and while the left-eye image is displayed, the left-eye shutter is opened and the right-eye shutter is closed. Accordingly, the user can observe the right-eye image only with the right eye, can observe the left-eye image with only the left eye, and can stereoscopically view the 3D image displayed on the panel.
- the phosphor used in the panel has a long afterglow time, and there is a phosphor material having a characteristic that afterglow lasts for several milliseconds after the sustain discharge is finished.
- the afterglow is a phenomenon in which light emission continues even after the discharge is completed in the discharge cell, and the afterglow time is a time until the afterglow sufficiently decreases.
- the right-eye image may be displayed as an afterimage on the panel for a while after the period for displaying the right-eye image ends.
- afterimage is a phenomenon in which an image is displayed on the panel due to afterglow even after the period for displaying one image ends.
- crosstalk When the left-eye image is displayed on the panel before the afterimage of the right-eye image disappears, a phenomenon occurs in which the right-eye image is mixed with the left-eye image. Similarly, if the right eye image is displayed on the panel before the afterimage of the left eye image disappears, a phenomenon occurs in which the left eye image is mixed with the right eye image. Hereinafter, such a phenomenon is referred to as “crosstalk”. And when crosstalk generate
- the present invention has a panel in which a plurality of discharge cells are arranged and a drive circuit for driving the panel, and alternately repeats a right-eye field for displaying a right-eye image signal and a left-eye field for displaying a left-eye image signal.
- a plasma display system comprising: a plasma display device that displays an image; and shutter glasses having a right-eye shutter that opens and closes based on a right-eye field and a left-eye shutter that opens and closes based on a left-eye field.
- Each of the right-eye field and the left-eye field is composed of a plurality of subfields set with luminance weights, and the luminance weight of the first subfield of one field is maximized, and thereafter the luminance weights are sequentially decreased.
- Luminance weight for each subfield so that Set and open the right eye shutter before the sustain period of the subfield where the writing operation is performed at the beginning of the right eye field, close the right eye shutter before the next left eye field of the right eye field, and start the first of the left eye field.
- the shutter glasses are controlled so that the left eye shutter is opened before the sustain period of the subfield in which the writing operation is performed, and the left eye shutter is closed before the right eye field next to the left eye field.
- a plasma display device that can be used as a 3D image display device, it is possible to reduce crosstalk for a user who views a 3D image displayed on the panel through shutter glasses, and to improve image display quality.
- the present invention further includes a panel having a plurality of discharge cells and a drive circuit for driving the panel, and alternately repeats a right-eye field for displaying a right-eye image signal and a left-eye field for displaying a left-eye image signal.
- a plasma display system comprising: a plasma display device for displaying an image on a panel; and shutter glasses having a right-eye shutter that opens and closes based on a right-eye field and a left-eye shutter that opens and closes based on a left-eye field.
- the apparatus comprises each of the right-eye field and the left-eye field as a plurality of subfields set with luminance weights, maximizes the luminance weight of the first subfield of one field, and thereafter increases the luminance weight.
- the right-eye shutter is opened before the first sub-field maintaining period when the write operation is performed in the first sub-field of one field.
- the right eye shutter is opened before the sustain period of the next subfield after the first subfield, and when the right eye shutter is closed, the right eye field is preceded by the previous left eye field.
- the left-eye shutter When the left-eye shutter is closed and the left-eye shutter is opened in the left-eye field, the left-eye shutter is opened before the maintenance period of the first sub-field when the write operation is performed in the first sub-field of one field, When no write operation is performed in the first subfield, the next subfield of the first subfield
- the shutter glasses are controlled to close the left eye shutter before the right eye field next to the left eye field when the left eye shutter is opened and the left eye shutter is closed before the field maintenance period. To do.
- a plasma display device that can be used as a 3D image display device, it is possible to reduce crosstalk for a user who views a 3D image displayed on the panel through shutter glasses, and to improve image display quality.
- the present invention further includes a panel having a plurality of discharge cells and a drive circuit for driving the panel, and alternately repeats a right-eye field for displaying a right-eye image signal and a left-eye field for displaying a left-eye image signal.
- the display circuit displays an image on a panel
- the drive circuit includes a plurality of sub-fields each having a luminance weight and each of the right-eye field and the left-eye field, and the first sub-field of one field.
- the luminance weight is set to each sub-field so that the luminance weight of the field is maximized and thereafter the luminance weight is sequentially decreased.
- the luminance weight is set to the first in the right eye field.
- the right eye shutter is closed before the next left eye field of the field, the left eye shutter is opened before the sustain period of the subfield where the writing operation is performed at the beginning of the left eye field, and the right eye field next to the left eye field is opened.
- a control signal is generated so that the left-eye shutter is closed in advance.
- a plasma display device that can be used as a 3D image display device, it is possible to reduce crosstalk for a user who views a 3D image displayed on the panel through shutter glasses, and to improve image display quality.
- the present invention further includes a panel having a plurality of discharge cells and a drive circuit for driving the panel, and alternately repeats a right-eye field for displaying a right-eye image signal and a left-eye field for displaying a left-eye image signal.
- the display circuit displays an image on a panel
- the drive circuit includes a plurality of sub-fields each having a luminance weight and each of the right-eye field and the left-eye field, and the first sub-field of one field.
- the luminance weight is set to each sub-field so that the luminance weight of the field is maximized and thereafter the luminance weight is sequentially decreased.
- the right-eye field is set in the right-eye field.
- a plasma display device that can be used as a 3D image display device, it is possible to reduce crosstalk for a user who views a 3D image displayed on the panel through shutter glasses, and to improve image display quality.
- FIG. 1 is an exploded perspective view showing a structure of a panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
- FIG. 2 is an electrode array diagram of the panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
- FIG. 3 is a diagram schematically showing a circuit block and a plasma display system of the plasma display device in accordance with the first exemplary embodiment of the present invention.
- FIG. 4 is a diagram schematically showing drive voltage waveforms applied to each electrode of the panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
- FIG. 5 is a diagram schematically showing an example of the subfield configuration of the plasma display apparatus and the opening / closing control of the shutter glasses in the first embodiment of the present invention.
- FIG. 6 is a diagram schematically showing the intensity of afterglow in the field when a sustain discharge is generated in the field immediately before the field.
- FIG. 7 is a diagram schematically showing an example of the subfield configuration of the plasma display device and the shutter glasses opening / closing control according to the second embodiment of the present invention.
- FIG. 1 is an exploded perspective view showing the structure of panel 10 used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
- a plurality of display electrode pairs 24 each including a scanning electrode 22 and a sustaining electrode 23 are formed on a glass front substrate 21.
- a dielectric layer 25 is formed so as to cover the scan electrode 22 and the sustain electrode 23, and a protective layer 26 is formed on the dielectric layer 25.
- This protective layer 26 has been used as a panel material in order to lower the discharge starting voltage in the discharge cell.
- the secondary layer 26 has a large secondary electron emission coefficient and is durable. It is made of a material mainly composed of magnesium oxide (MgO).
- a plurality of data electrodes 32 are formed on the rear substrate 31, a dielectric layer 33 is formed so as to cover the data electrodes 32, and a grid-like partition wall 34 is formed thereon.
- a phosphor layer 35 that emits light of each color of red (R), green (G), and blue (B) is provided on the side surface of the partition wall 34 and on the dielectric layer 33.
- the front substrate 21 and the rear substrate 31 are arranged to face each other so that the display electrode pair 24 and the data electrode 32 intersect with each other with a minute discharge space interposed therebetween. And the outer peripheral part is sealed with sealing materials, such as glass frit. Then, for example, a mixed gas of neon and xenon is sealed in the discharge space inside as a discharge gas.
- the discharge space is partitioned into a plurality of sections by partition walls 34, and discharge cells are formed at the intersections between the display electrode pairs 24 and the data electrodes 32.
- discharge is generated in these discharge cells, and the phosphor layer 35 of the discharge cells emits light (lights the discharge cells), thereby displaying a color image on the panel 10.
- One pixel is composed of three discharge cells that emit blue (B) light.
- the structure of the panel 10 is not limited to the above-described structure, and may be, for example, provided with a stripe-shaped partition wall.
- FIG. 2 is an electrode array diagram of panel 10 used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
- the panel 10 includes n scan electrodes SC1 to SCn (scan electrode 22 in FIG. 1) extended in the horizontal direction (row direction) and n sustain electrodes SU1 to SUn (sustain electrodes in FIG. 1). 23) are arranged, and m data electrodes D1 to Dm (data electrodes 32 in FIG. 1) extending in the vertical direction (column direction) are arranged.
- FIG. 3 is a diagram schematically showing a circuit block and a plasma display system of the plasma display device 40 according to the first embodiment of the present invention.
- the plasma display system shown in the present embodiment includes a plasma display device 40 and shutter glasses 50 as components.
- the plasma display device 40 includes a panel 10 and a drive circuit that drives the panel 10.
- the drive circuit supplies necessary power to the image signal processing circuit 41, the data electrode drive circuit 42, the scan electrode drive circuit 43, the sustain electrode drive circuit 44, the timing generation circuit 45, the control signal output unit 46, and each circuit block.
- a power supply circuit (not shown) is provided.
- the image signal processing circuit 41 assigns a gradation value to each discharge cell based on the input image signal.
- the gradation value is converted into image data indicating light emission / non-light emission for each subfield (data corresponding to light emission / non-light emission corresponding to digital signals “1” and “0”). That is, the image signal processing circuit 41 converts the image signal for each field into image data indicating light emission / non-light emission for each subfield.
- each gradation value of R, G, and B is assigned to each discharge cell based on the R signal, the G signal, and the B signal.
- the input image signal includes a luminance signal (Y signal) and a saturation signal (C signal, RY signal and BY signal, or u signal and v signal, etc.)
- the luminance signal and saturation signal Based on the degree signal, R signal, G signal, and B signal are calculated, and thereafter, R, G, and B gradation values (gradation values expressed in one field) are assigned to each discharge cell. Then, the R, G, and B gradation values assigned to each discharge cell are converted into image data indicating light emission / non-light emission for each subfield.
- the input image signal is a stereoscopic 3D image signal having a right-eye image signal and a left-eye image signal.
- the image signal is displayed on the panel 10, the right-eye image signal and the left-eye image signal are displayed.
- the image signal for use is alternately input to the image signal processing circuit 41 for each field. Therefore, the image data conversion circuit 49 converts the right eye image signal into right eye image data, and converts the left eye image signal into left eye image data.
- the timing generation circuit 45 generates various timing signals for controlling the operation of each circuit block based on the horizontal synchronization signal and the vertical synchronization signal.
- the generated timing signal is supplied to each circuit block (data electrode drive circuit 42, scan electrode drive circuit 43, sustain electrode drive circuit 44, image signal processing circuit 41, etc.).
- the timing generation circuit 45 outputs a shutter control signal for controlling opening / closing of the shutter of the shutter glasses 50 to the control signal output unit 46.
- the timing generation circuit 45 turns on the shutter control signal (“1”) when the shutter of the shutter glasses 50 is opened (becomes a state of transmitting visible light), and closes the shutter of the shutter glasses 50 (blocks the visible light).
- the shutter control signal is turned off ("0").
- the shutter control signal is turned on when the right-eye field for displaying the right-eye image signal is displayed on the panel 10 and turned off when the left-eye field for displaying the left-eye image signal is displayed on the panel 10.
- control signal right-eye shutter control signal
- left-eye field for displaying the left-eye image signal is displayed on the panel 10
- right-eye field for displaying the right-eye image signal is displayed on the panel 10. It consists of a control signal (left-eye shutter control signal) that is sometimes off.
- Scan electrode drive circuit 43 includes an initialization waveform generation circuit, a sustain pulse generation circuit, and a scan pulse generation circuit (not shown in FIG. 3), and generates a drive voltage waveform based on a timing signal supplied from timing generation circuit 45. It is prepared and applied to each of scan electrode SC1 to scan electrode SCn.
- the initialization waveform generation circuit generates an initialization waveform to be applied to scan electrode SC1 through scan electrode SCn based on the timing signal during the initialization period.
- the sustain pulse generating circuit generates a sustain pulse to be applied to scan electrode SC1 through scan electrode SCn based on the timing signal during the sustain period.
- the scan pulse generating circuit includes a plurality of scan electrode driving ICs (scan ICs), and generates scan pulses to be applied to scan electrode SC1 through scan electrode SCn based on a timing signal during an address period.
- Sustain electrode drive circuit 44 includes a sustain pulse generation circuit and a circuit for generating voltage Ve1 and voltage Ve2 (not shown in FIG. 3), and generates a drive voltage waveform based on a timing signal supplied from timing generation circuit 45. It is prepared and applied to each of sustain electrode SU1 through sustain electrode SUn. In the sustain period, a sustain pulse is generated based on the timing signal and applied to sustain electrode SU1 through sustain electrode SUn.
- the data electrode driving circuit 42 converts the data for each subfield constituting the image data including the right-eye image data and the left-eye image data into signals corresponding to the data electrodes D1 to Dm. Then, based on the signal and the timing signal supplied from the timing generation circuit 45, the data electrodes D1 to Dm are driven. In the address period, an address pulse is generated and applied to each of the data electrodes D1 to Dm.
- the control signal output unit 46 includes a light emitting element such as an LED (Light Emitting Diode). Then, the shutter control signal is converted into an infrared signal, for example, and supplied to the shutter glasses 50.
- the shutter control signal is a signal for controlling the opening and closing of the shutter of the shutter glasses 50 used by the user in synchronization with the right eye field and the left eye field.
- the control signal output unit 46 switches the shutter control signal between a code portion and a shutter for distinguishing, for example, “right-eye shutter”, “left-eye shutter”, “open”, “closed”, and the like. It converts into the serial signal which has a timing part which shows a timing.
- This serial signal is a shutter control signal.
- the serial signal is converted into an infrared optical signal using a light emitting element such as an LED and supplied to the shutter glasses 50.
- the shutter glasses 50 include a control signal receiving unit (not shown) that receives an optical signal output from the control signal output unit 46, a right-eye shutter 52R, and a left-eye shutter 52L.
- the right-eye shutter 52R and the left-eye shutter 52L can be opened and closed independently.
- the shutter glasses 50 demodulate the optical signal output from the control signal output unit 46 into a shutter control signal, and open and close the right-eye shutter 52R and the left-eye shutter 52L based on the shutter control signal.
- the right-eye shutter 52R opens (transmits visible light) when the right-eye shutter control signal is on, and closes (blocks visible light) when it is off.
- the left-eye shutter 52L opens (transmits visible light) when the left-eye shutter control signal is on, and closes (blocks visible light) when it is off.
- the right-eye shutter 52R and the left-eye shutter 52L can be configured using, for example, liquid crystal, but the present invention is not limited to the liquid crystal, and the visible light is blocked and transmitted. Any device can be used as long as it can be switched at high speed.
- Plasma display device 40 in the present embodiment performs gradation display by the subfield method.
- the subfield method one field is divided into a plurality of subfields on the time axis, and a luminance weight is set for each subfield.
- Each subfield has an initialization period, an address period, and a sustain period.
- An image is displayed on the panel 10 by controlling light emission / non-light emission of each discharge cell for each subfield.
- the luminance weight represents a ratio of the luminance magnitudes displayed in each subfield, and the number of sustain pulses corresponding to the luminance weight is generated in the sustain period in each subfield. Therefore, for example, the subfield with the luminance weight “8” emits light with a luminance about eight times that of the subfield with the luminance weight “1”, and emits light with about four times the luminance of the subfield with the luminance weight “2”. Therefore, various gradations can be displayed and images can be displayed by selectively causing each subfield to emit light in a combination according to the image signal.
- the image signal input to the plasma display device 40 is a stereoscopic image signal in which a right-eye image signal and a left-eye image signal are alternately repeated for each field.
- a right-eye field for displaying a right-eye image signal and a left-eye field for displaying a left-eye image signal are alternately and repeatedly displayed on the panel 10, so that a stereoscopic image composed of a right-eye image and a left-eye image is displayed.
- the image (3D image) is displayed on the panel 10.
- the number of 3D images displayed per unit time (for example, 1 second) is half of the field frequency (the number of fields generated per second). For example, if the field frequency is 60 Hz, the number of right-eye images and the number of left-eye images displayed per second is 30, so that 30 3D images are displayed per second. Therefore, in the present embodiment, the field frequency is set to twice the normal frequency (for example, 120 Hz) to reduce image flicker that is likely to occur when an image with a low field frequency is displayed.
- the user views the 3D image displayed on the panel 10 through the shutter glasses 50 that independently open and close the right-eye shutter 52R and the left-eye shutter 52L in synchronization with the right-eye field and the left-eye field.
- the user can observe the right-eye image only with the right eye and the left-eye image with only the left eye, so that the 3D image displayed on the panel 10 can be stereoscopically viewed.
- the right-eye field and the left-eye field differ only in the image signal to be displayed, and the field configuration such as the number of subfields constituting one field, the luminance weight of each subfield, and the arrangement of subfields is as follows. The same. Therefore, hereinafter, when it is not necessary to distinguish between “for right eye” and “for left eye”, the field for right eye and the field for left eye are simply abbreviated as fields.
- the right-eye image signal and the left-eye image signal are simply abbreviated as image signals.
- the field configuration is also referred to as a subfield configuration.
- Each field of the right eye field and the left eye field has a plurality of subfields, and each subfield has an initialization period, an address period, and a sustain period.
- an initializing operation is performed in which initializing discharge is generated in the discharge cells and wall charges necessary for the address discharge in the subsequent address period are formed on each electrode.
- the initializing operation includes a forced initializing operation in which an initializing discharge is generated in the discharge cell regardless of the operation in the immediately preceding subfield, and an initializing discharge only in the discharge cell in which the addressing discharge is generated in the addressing period in the immediately preceding subfield. And a selective initialization operation that generates
- a scan pulse is applied to the scan electrode 22 and an address pulse is selectively applied to the data electrode 32, an address discharge is selectively generated in the discharge cells to emit light, and a sustain discharge is generated in the subsequent sustain period.
- An address operation for forming wall charges to be generated in the discharge cells is performed.
- the sustain pulses of the number obtained by multiplying the luminance weight set in each subfield by a predetermined proportional constant are alternately applied to the scan electrode 22 and the sustain electrode 23, and the address discharge was generated in the immediately preceding address period.
- a sustain discharge is generated in the discharge cell, and a sustain operation for emitting light from the discharge cell is performed.
- This proportionality constant is the luminance magnification. For example, when the luminance magnification is two, the sustain pulse is applied to the scan electrode 22 and the sustain electrode 23 four times in the sustain period of the subfield having the luminance weight “2”. Therefore, the number of sustain pulses generated in the sustain period is 8.
- Each subfield of subfield SF1 to subfield SF5 has a luminance weight of (16, 8, 4, 2, 1).
- the subfield SF1 generated at the beginning of the field is set to the subfield having the largest luminance weight, and thereafter, the luminance weight is set to each subfield so that the luminance weight is sequentially reduced.
- the subfield SF5 generated at the end of the field is set as the subfield having the smallest luminance weight.
- a forced initializing operation that generates an initializing discharge in the discharge cell is performed regardless of the operation of the immediately preceding subfield.
- a selective initializing operation for generating an initializing discharge only in the discharge cells in which an address discharge has occurred in the immediately preceding subfield is performed.
- the light emission not related to the image display is only the light emission due to the discharge of the forced initialization operation in the subfield SF1. Therefore, the black luminance, which is the luminance of the black display region where no sustain discharge occurs, is only weak light emission in the forced initialization operation, and an image with high contrast can be displayed on the panel 10.
- the number of subfields constituting one field and the luminance weight of each subfield are not limited to the above values.
- the structure which switches a subfield structure based on an image signal etc. may be sufficient.
- FIG. 4 is a diagram showing drive voltage waveforms applied to the respective electrodes of panel 10 used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
- FIG. 4 shows scan electrode SC1 that performs the address operation first in the address period, scan electrode SCn that performs the address operation last in the address period, sustain electrode SU1 to sustain electrode SUn, and data electrode D1 to data electrode Dm.
- the drive voltage waveform to be applied is shown.
- FIG. 4 mainly shows drive voltage waveforms in the subfield SF1 and the subfield SF2.
- the subfield SF1 is a subfield for performing a forced initialization operation
- the subfields SF2 to SF5 are subfields for performing a selective initialization operation. Therefore, the waveform shape of the drive voltage applied to the scan electrode 22 in the initialization period differs between the subfield SF1 and the subfields SF2 to SF5.
- the drive voltage waveform in subfield SF3 to subfield SF5 is substantially the same as the drive voltage waveform in subfield SF2, except that the number of sustain pulses generated in the sustain period is different.
- Scan electrode SCi, sustain electrode SUi, and data electrode Dk in the following represent electrodes selected based on image data (data indicating light emission / non-light emission for each subfield) from among the electrodes.
- the voltage 0 (V) is applied to the data electrode D1 to the data electrode Dm and the sustain electrode SU1 to the sustain electrode SUn.
- Voltage Vi1 is applied to scan electrode SC1 through scan electrode SCn, and a ramp waveform voltage that gradually increases from voltage Vi1 to voltage Vi2 is applied.
- Voltage Vi1 is set to a voltage lower than the discharge start voltage with respect to sustain electrode SU1 through sustain electrode SUn, and voltage Vi2 is set to a voltage exceeding the discharge start voltage.
- the initialization operation in the initialization period of the subfield SF1 that is, the forced initialization operation for forcibly generating the initialization discharge in all the discharge cells is completed.
- voltage Ve2 is applied to sustain electrode SU1 through sustain electrode SUn
- voltage Vc is applied to each of scan electrode SC1 through scan electrode SCn.
- a negative scan pulse having a negative voltage Va is applied to the scan electrode SC1 in the first row where the address operation is performed first.
- a positive address pulse of a positive voltage Vd is applied to the data electrode Dk of the discharge cell that should emit light in the first row of the data electrodes D1 to Dm.
- the voltage difference at the intersection between the data electrode Dk of the discharge cell to which the address pulse of the voltage Vd is applied and the scan electrode SC1 is the difference between the externally applied voltage (voltage Vd ⁇ voltage Va) and the wall voltage on the data electrode Dk and the scan electrode.
- the difference from the wall voltage on SC1 is added.
- the voltage difference between data electrode Dk and scan electrode SC1 exceeds the discharge start voltage, and a discharge is generated between data electrode Dk and scan electrode SC1.
- the voltage difference between sustain electrode SU1 and scan electrode SC1 is the difference between the externally applied voltages (voltage Ve2 ⁇ voltage Va) and sustain electrode SU1.
- the difference between the upper wall voltage and the wall voltage on the scan electrode SC1 is added.
- the sustain electrode SU1 and the scan electrode SC1 are not easily discharged but are likely to be discharged. Can do.
- a discharge generated between the data electrode Dk and the scan electrode SC1 can be triggered to generate a discharge between the sustain electrode SU1 and the scan electrode SC1 in the region intersecting the data electrode Dk.
- an address discharge is generated in the discharge cell to emit light, positive wall voltage is accumulated on scan electrode SC1, negative wall voltage is accumulated on sustain electrode SU1, and negative polarity is also formed on data electrode Dk.
- the wall voltage is accumulated.
- the above address operation is sequentially performed in the order of scan electrode SC2, scan electrode SC3,..., Scan electrode SCn until reaching the discharge cell in the n-th row, and the address period of subfield SF1 is completed.
- address discharge is selectively generated in the discharge cells to emit light, and wall charges are formed in the discharge cells.
- the voltage difference between scan electrode SCi and sustain electrode SUi exceeds the discharge start voltage, and a sustain discharge occurs between scan electrode SCi and sustain electrode SUi. Then, the phosphor layer 35 emits light by the ultraviolet rays generated by this discharge. In addition, due to this discharge, negative wall voltage is accumulated on scan electrode SCi, and positive wall voltage is accumulated on sustain electrode SUi. Further, a positive wall voltage is also accumulated on the data electrode Dk. In the discharge cells in which no address discharge has occurred in the address period, no sustain discharge occurs, and the wall voltage at the end of the initialization period is maintained.
- sustain pulses of the number obtained by multiplying the luminance weight by a predetermined luminance magnification are alternately applied to scan electrode SC1 through scan electrode SCn and sustain electrode SU1 through sustain electrode SUn.
- the voltage that is the base potential is maintained while the voltage 0 (V) is applied to sustain electrode SU1 through sustain electrode SUn and data electrode D1 through data electrode Dm.
- a ramp waveform voltage that gradually rises from 0 (V) toward voltage Vr is applied to scan electrode SC1 through scan electrode SCn.
- the selective initializing operation is performed in which a drive voltage waveform in which the first half of the initializing period in the subfield SF1 is omitted is applied to each electrode.
- voltage Ve1 is applied to sustain electrode SU1 through sustain electrode SUn
- voltage 0 (V) is applied to data electrode D1 through data electrode Dm.
- a scan waveform SC1 to scan electrode SCn is applied with a ramp waveform voltage that gradually falls from a voltage lower than the discharge start voltage (for example, voltage 0 (V)) toward negative voltage Vi4.
- Voltage Vi4 is set to a voltage exceeding the discharge start voltage with respect to sustain electrode SU1 through sustain electrode SUn.
- a weak initializing discharge is generated in a discharge cell that has generated a sustain discharge in the sustain period of the immediately preceding subfield (subfield SF1 in FIG. 4). To do.
- the initializing discharge weakens the wall voltage on scan electrode SCi and sustain electrode SUi. Further, since a sufficient positive wall voltage is accumulated on the data electrode Dk due to the sustain discharge generated in the sustain period of the immediately preceding subfield, an excessive portion of the wall voltage is discharged and the data electrode Dk is discharged.
- the upper wall voltage is adjusted to a wall voltage suitable for the write operation.
- the initialization operation in the subfield SF2 is selectively performed in the discharge cell in which the address operation is performed in the address period of the immediately preceding subfield, that is, in the discharge cell in which the sustain discharge is generated in the sustain period of the immediately preceding subfield.
- a selective initializing operation for generating initializing discharge is performed.
- a drive voltage waveform similar to that in the address period of the subfield SF1 is applied to each electrode, and an address operation for accumulating wall voltage on each electrode of the discharge cell to emit light is performed.
- the number of sustain pulses corresponding to the luminance weight is alternately applied to scan electrode SC1 through scan electrode SCn and sustain electrode SU1 through sustain electrode SUn.
- a sustain discharge is generated in the discharge cell that has generated the address discharge.
- each subfield of subfield SF3 to subfield SF5 In the initialization period and address period of each subfield of subfield SF3 to subfield SF5, the same drive voltage waveform as that in the initialization period and address period of subfield SF2 is applied to each electrode. In the sustain period of each subfield of subfield SF3 to subfield SF5, the same drive voltage waveform as that of subfield SF2 is applied to each electrode except for the number of sustain pulses generated in the sustain period.
- Voltage Va ⁇ 180 (V)
- voltage Vc ⁇ 35 (V)
- voltage Vs 190 (V)
- voltage Vr 190 (V)
- voltage Ve1 125 (V)
- voltage Ve2 130 (V)
- the voltage Vd is set to 60 (V).
- the rising ramp waveform voltage applied to scan electrode SC1 through scan electrode SCn in the initializing period of subfield SF1 is set to a gradient of 1.5 (V / ⁇ sec), and the falling ramp waveform voltage is set.
- the falling ramp waveform voltage applied to scan electrode SC1 to scan electrode SCn during the initialization period of subfield SF2 to subfield SF5 sets the gradient to ⁇ 2. 5 (V / ⁇ sec) is set.
- each voltage value, gradient, and the like are preferably set optimally based on the discharge characteristics of the panel and the specifications of the plasma display device.
- FIG. 5 is a diagram schematically showing an example of the subfield configuration of the plasma display device 40 and the opening / closing control of the shutter glasses 50 in the first embodiment of the present invention.
- FIG. 5 shows scan electrode SC1 that performs the address operation first in the address period, scan electrode SCn that performs the address operation last in the address period, sustain electrode SU1 to sustain electrode SUn, and data electrode D1 to data electrode Dm.
- the drive voltage waveform to be applied and the opening / closing operations of the right-eye shutter 52R and the left-eye shutter 52L are shown.
- FIG. 5 shows three fields.
- a right eye field and a left eye field are alternately generated.
- the first field is the right-eye field FR1
- the right-eye image signal is displayed on the panel 10.
- the second field is the left-eye field FL1, and displays the left-eye image signal on the panel 10.
- the third field is the right-eye field FR2, and the right-eye image signal is displayed on the panel 10.
- the write operation is not performed in the subfield SF1, but the write operation is performed in the subfields SF2 to SF5.
- the subfield SF1 and the subfield SF2 are performed.
- An example is shown in which the write operation is performed in the subfields SF3 to SF5 without performing the write operation, and the write operation is performed in the subfields SF1 to SF5 in the field for right eye FR2.
- the user viewing the 3D image displayed on the panel 10 through the shutter glasses 50 recognizes the images (right-eye image and left-eye image) displayed in two fields as one 3D image. Therefore, the number of images displayed on the panel 10 per second is observed by the user as half the number of fields displayed per second. For example, when the field frequency of the 3D image displayed on the panel (the number of fields generated per second) is 60 Hz, the user observes 30 3D images per second. Therefore, in order to display 60 3D images per second, the field frequency must be set to 120 Hz, which is twice 60 Hz. Therefore, in this embodiment, the field frequency (the number of fields generated per second) is set to twice the normal frequency (for example, 120 Hz) so that the user can smoothly observe the 3D moving image. ing.
- Each field of the right eye field and the left eye field has five subfields (subfield SF1, subfield SF2, subfield SF3, subfield SF4, and subfield SF5).
- luminance weights (16, 8, 4, 2, 1) are set in the subfields SF1 to SF5, respectively.
- one field is constituted by five subfields in which the luminance weight is set in each subfield so that the luminance weight is sequentially decreased in the order in which the subfields are generated. That is, the subfield having the largest luminance weight is generated at the beginning of the field, the subfield having the second largest luminance weight is generated, the subfield having the third largest luminance weight is generated, and the fourth subfield is generated. The subfield with the fourth largest luminance weight is generated, and the subfield with the smallest luminance weight is generated at the end of the field.
- the reason why each subfield is generated and the panel 10 is driven is as follows.
- the phosphor layer 35 used in the panel 10 has afterglow characteristics depending on the material constituting the phosphor.
- This afterglow is a phenomenon in which the phosphor continues to emit light after the end of discharge.
- the intensity of afterglow is proportional to the luminance when the phosphor emits light, and the higher the luminance when the phosphor emits light, the stronger the afterglow.
- afterglow decays with a time constant according to the characteristics of the phosphor, and the luminance gradually decreases with time. However, afterglow persists for several milliseconds after the end of the sustain discharge.
- Light emission generated in a subfield with a large luminance weight is higher in luminance than light emission generated in a subfield with a small luminance weight. Therefore, the afterglow due to light emission generated in a subfield with a large luminance weight has higher luminance and the time required for attenuation than the afterglow due to light emission generated in a subfield with a small luminance weight.
- the afterglow leaking into the subsequent field increases compared to when the final subfield is a subfield with a small luminance weight.
- the plasma display device 40 in which the right-eye field and the left-eye field are alternately generated to display a 3D image on the panel 10, when the afterglow generated in one field leaks into the subsequent field, the afterglow is It is observed by the user as unnecessary light emission not related to the image signal. This phenomenon is crosstalk.
- the image display quality is image display quality for a user who views a 3D image through the shutter glasses 50.
- a subfield having the largest luminance weight is generated at the beginning of the field, and thereafter, the luminance weight is decreased in the order in which the subfields are generated, and the last subfield of the field is changed to the subfield having the smallest luminance weight, and the next field is reached. It is desirable to reduce the leakage of afterglow as much as possible.
- the subfield SF1 is set to the subfield having the largest luminance weight, and the luminance weights are sequentially reduced in the subsequent subfields.
- the shutter 52R for the right eye and the shutter 52L for the left eye of the shutter glasses 50 control the opening / closing operation of the shutter as follows based on the ON / OFF of the shutter control signal output from the control signal output unit 46 and received by the shutter glasses 50. Is done.
- the shutter 52R for the right eye of the shutter glasses 50 opens the shutter before the subfield maintenance period in which the writing operation is performed at the beginning of the right eye field, and closes the shutter before the start of the next left eye field.
- the left-eye shutter 52L opens the shutter before the sustain period of the subfield in which the writing operation is performed at the beginning of the left-eye field, and closes the shutter before the start of the next right-eye field.
- the write operation is not performed in the subfield SF1, but the write operation is performed in the subfields SF2 to SF5. Therefore, the subfield in which the write operation is first performed in the right eye field FR1 is the subfield SF2. Therefore, in the shutter glasses 50 according to the present embodiment, in the right-eye field FR1, the right-eye shutter 52R is opened in synchronization with the writing period start time Ro1 of the subfield SF2, and at the end time Rc1 of the sustaining period of the subfield SF5. In synchronization, the right-eye shutter 52R is closed.
- the write operation is not performed in the subfield SF1 and the subfield SF2, but the write operation is performed in the subfields SF3 to SF5. Accordingly, the subfield in which the first write operation is performed in the left eye field FL1 is the subfield SF3. Therefore, shutter glasses 50 according to the present embodiment open left-eye shutter 52L in synchronization with start timing Lo1 of subfield SF3 in the left-eye field FL1, and at end timing Lc1 of the sustain period of subfield SF5. In synchronization, the left-eye shutter 52L is closed.
- the write operation is performed in the subfields SF1 to SF5. Therefore, the subfield in which the write operation is first performed in the right eye field FR2 is the subfield SF1. Therefore, in the shutter glasses 50 according to the present embodiment, in the right-eye field FR2, the right-eye shutter 52R is opened in synchronization with the start time Ro2 of the writing period of the subfield SF1, and at the end time Rc2 of the maintenance period of the subfield SF5. In synchronization, the right-eye shutter 52R is closed.
- each of the right-eye field and the left-eye field corresponds to the field in synchronization with the start time of the write period of the subfield in which the write operation is first performed in each field. Open the shutter you want.
- the shutter glasses 50 it takes time corresponding to the characteristics of the material (for example, liquid crystal) constituting the shutter until the shutter is completely closed after the shutter starts to be closed or until the shutter is fully opened after the shutter is started to be opened. .
- the material for example, liquid crystal
- it may take about 0.5 msec from the start of closing the shutter until it is completely closed, and it may take about 2 msec from when the shutter starts to fully open. is there.
- the opening / closing operation of the shutter is controlled in consideration of the time required from the start of closing the shutter until the shutter is completely closed and the time required from the start of opening the shutter until the shutter is completely opened.
- the transmittance is defined as a state in which the shutter is completely opened and the transmittance is 100% (maximum transmittance) and the shutter is completely closed.
- the percentage of transmission of visible light is expressed as a percentage with a transmittance of 0% (transmittance is minimum).
- the shutter When opening the shutter, when light emission due to the sustain discharge occurs in the subfield where the address operation is performed at the beginning of each field, the shutter is set so that the light emission is transmitted through the shutter corresponding to the field.
- Set the opening timing That is, in the present embodiment, in the subfield where the writing operation is performed at the beginning of each field, the shutter opening timing is set so that the shutter corresponding to the field opens immediately before the start of the sustain period.
- the above-mentioned “shutter opens” is not limited to a transmittance of 100%.
- the transmittance of the shutter corresponding to the field is preferably 90% or more immediately before the start of the sustain period.
- the timing for opening the shutter is set so as to be at least%.
- the shutter corresponding to that field starts to close and immediately before the start of the next field.
- the timing for closing the shutter is set so that the transmittance of the shutter is 30% or less, preferably 10% or less.
- the timing of opening the shutter corresponding to the field corresponds to that field immediately before the subfield maintenance period in which the writing operation is performed at the beginning of the field. Set the shutter to open.
- the shutter corresponding to the field is opened before the sustain period of the subfield in which the writing operation is performed at the beginning of each field. Close the shutter before starting the field.
- FIG. 6 is a diagram schematically showing the intensity of afterglow in the field when a sustain discharge is generated in the field immediately before the field.
- one field includes five subfields, subfield SF1 to subfield SF5, and (16, 8, 4, 2, 1) is included in each subfield of subfield SF1 to subfield SF5. ) Shows the result of an experiment conducted with the luminance weight set.
- the horizontal axis represents a subfield that generates a sustain discharge in the field immediately before the field
- the vertical axis represents the intensity of afterglow as a relative value.
- “SF1 to SF5” shown in FIG. 6 indicates that a sustain discharge has occurred in each subfield from subfield SF1 to subfield SF5. Therefore, the intensity of afterglow when the gradation “31” is displayed is shown in the vertical axis direction.
- “SF2 to SF5” indicates that a sustain discharge has occurred in each subfield from subfield SF2 to subfield SF5. Therefore, the intensity of afterglow when gradation “15” is displayed is shown in the vertical axis direction.
- SF3 to SF5 indicates that a sustain discharge has occurred in each subfield from subfield SF3 to subfield SF5. Therefore, the intensity of afterglow when gradation “7” is displayed is shown in the vertical axis direction.
- SF4 to SF5 indicates that a sustain discharge has occurred in the subfield SF4 and the subfield SF5. Therefore, the intensity of afterglow when gradation “3” is displayed is shown in the vertical axis direction.
- SF5 indicates that a sustain discharge has occurred only in the subfield SF5. Therefore, the intensity of afterglow when gradation “1” is displayed is shown in the vertical axis direction.
- the value indicated by “SF1” indicates the intensity of afterglow at the start of the writing period of the subfield SF1 of the field.
- the value indicated by “SF2” indicates the intensity of afterglow at the start of the writing period of the subfield SF2 of the field.
- the value indicated by “SF3” indicates the intensity of afterglow at the start of the writing period of the subfield SF3 of the field.
- the afterglow in the field increases.
- the intensity of afterglow at the start of the writing period of the subfield SF1 of the field is approximately twice as large as “SF4 to SF5” in “SF1 to SF5”.
- the intensity of afterglow at the start of the writing period of subfield SF1 is about three times the intensity of afterglow at the start of the writing period of subfield SF2. This is about 5 times the intensity of afterglow at the start of the writing period of SF3. This shows that afterglow decays rapidly. Therefore, even if strong afterglow is observed in the writing period of subfield SF1, the afterglow is weak in the writing period of subfield SF2, and the afterglow is further weakened in the writing period of subfield SF3. Does not have any effect.
- the afterimage phenomenon occurs more strongly as the afterglow is stronger. Then, the lower the display gradation of the field, the more clearly the afterimage is observed by the user.
- a subfield having the largest luminance weight is generated at the beginning of the field, and thereafter, the luminance weight is decreased in the order in which the subfields are generated, and the last subfield of the field is set to the subfield having the smallest luminance weight. Yes. Therefore, if the gradation displayed on the panel is dark, subfields that occur relatively early in the field, such as subfield SF1 and subfield SF2, which have relatively large luminance weights, do not emit light according to the gradation.
- the shutter corresponding to the field of the shutter glasses 50 is not opened at least until the subfield SF1 is completed.
- the shutter corresponding to the field of the shutter glasses 50 is not opened at least until the subfield SF2 is finished.
- the timing of opening the shutter corresponding to the field is delayed compared to a field displaying a bright gradation in which an afterimage is not conspicuous.
- the afterglow while the shutter is closed is not visible to the user. Therefore, if the timing for opening the shutter is delayed, the afterglow that enters the user's eyes is less than when the timing for opening the shutter is early. Further, if the timing of opening the shutter is delayed, the afterglow becomes weak during that time, so that the afterglow that enters the user's eyes when the shutter is opened is reduced accordingly.
- the timing of opening the shutter corresponding to the field is delayed compared to the field displaying a bright gradation. Therefore, afterglow is weakened during this period, and a user who views a 3D image through the shutter glasses 50 can suppress crosstalk and provide a high-quality 3D image.
- the forced initialization operation is performed in the initialization period of the subfield SF1 that occurs at the beginning of the field.
- the initializing discharge can be generated in all the discharge cells in panel 10 at least once per field, and the address operation can be performed stably.
- the light emission accompanying the forced initialization operation occurs.
- the shutter 52R for the right eye is used during the period in which the forced initialization operation is performed. Both the left-eye shutter 52L are closed.
- the plasma display system According to the present embodiment, light emission generated by the forced initialization operation is blocked by the right-eye shutter 52R and the left-eye shutter 52L, and does not enter the eyes of the user. That is, the user viewing the 3D image through the shutter glasses 50 cannot see the light emission by the forced initialization operation, and the luminance of the light emission is reduced in the black luminance. As a result, the user can view an image with high contrast with reduced black luminance.
- the timing generation circuit 45 generates a timing signal so that the control signal output unit 46 outputs a shutter control signal for performing the above-described shutter opening / closing operation by the right-eye shutter 52R and the left-eye shutter 52L.
- the signal is supplied to the signal output unit 46.
- FIG. 7 is a diagram schematically showing an example of the subfield configuration of the plasma display device and the opening / closing control of the shutter glasses 50 according to the second embodiment of the present invention.
- scan electrode SC1 that performs the address operation first in the address period
- scan electrode SCn that performs the address operation last in the address period
- sustain electrode SU1 to sustain electrode SUn and data electrode D1 to The drive voltage waveform applied to each of the data electrodes Dm and the opening / closing operation of the right-eye shutter 52R and the left-eye shutter 52L are shown.
- the field frequency is set to twice the normal frequency (for example, 120 Hz).
- Each field of the right-eye field and the left-eye field has five subfields (subfield SF1, subfield SF2, subfield SF3, subfield SF4, subfield SF5), and subfield SF1 to subfield SF5.
- luminance weights (16, 8, 4, 2, 1) are set.
- FIG. 7 shows three fields as an example. Of the three fields shown in FIG. 7, the first field is the right-eye field FR ⁇ b> 1, and the right-eye image signal is displayed on the panel 10. The second field is the left-eye field FL1, and displays the left-eye image signal on the panel 10. The third field is the right-eye field FR2, and the right-eye image signal is displayed on the panel 10.
- the write operation is not performed in the subfield SF1, but the write operation is performed in the subfields SF2 to SF5.
- the subfield SF1 and the subfield SF2 are performed.
- An example is shown in which the write operation is performed in the subfields SF3 to SF5 without performing the write operation, and the write operation is performed in the subfields SF1 to SF5 in the field for right eye FR2.
- the writing operation is not performed in the subfield SF1, but the writing operation is performed in the subfields SF2 to SF5. Therefore, the subfield in which the write operation is first performed in the right eye field FR1 is the subfield SF2. Therefore, in the right eye field FR1, the shutter glasses 50 according to the present embodiment open the right eye shutter 52R in synchronization with the writing period start timing Ro1 of the subfield SF2, as in the operation described in the first embodiment. The right-eye shutter 52R is closed in synchronization with the end time Rc1 of the sustain period of the subfield SF5.
- the write operation is not performed in the subfield SF1 and the subfield SF2, but the write operation is performed in the subfields SF3 to SF5.
- the subfield in which the first write operation is performed in the left eye field FL1 is the subfield SF3.
- the shutter glasses 50 according to the present embodiment are different from the operation shown in the first embodiment in that the left eye shutter 52L is synchronized with the start time Lo1 of the writing period of the subfield SF2. Open and close the left-eye shutter 52L in synchronization with the end time Lc1 of the sustain period of the subfield SF5.
- the write operation is performed in the subfields SF1 to SF5. Therefore, the subfield in which the write operation is first performed in the right eye field FR2 is the subfield SF1. Therefore, in the right-eye field FR2, the shutter glasses 50 according to the present embodiment open the right-eye shutter 52R in synchronization with the start time Ro2 of the writing period of the subfield SF1, as in the operation described in the first embodiment. The right-eye shutter 52R is closed in synchronization with the end time Rc2 of the sustain period of the subfield SF5.
- the shutter corresponding to the field is opened in synchronization with the start time of the write period of the subfield SF1, and the write operation is not performed in the subfield SF1.
- the shutter corresponding to the field is opened in synchronization with the start time of the writing period of the subfield SF2.
- the operation for opening the shutter is controlled in consideration of the time required from the start of opening the shutter until it is fully opened.
- the afterglow attenuates rapidly with time. Therefore, as described above, paying attention only to the write operation of subfield SF1 occurring at the beginning of the field, in the field where the write operation is not performed in subfield SF1, the timing for opening the shutter corresponding to that field is set to the subfield. Even by delaying until the end of SF1, the crosstalk can be suppressed to a level where there is no practical problem.
- the opening / closing operation of the shutter may be controlled so that the shutter opens immediately before the sustain period starts.
- the timing of closing the shutter may be any time before the image display of the current field ends and the image display of the next field starts. Therefore, for example, the shutter may be closed immediately after the end of the last sustain discharge in the sustain period of the last subfield of the current field, or the shutter may be closed just before the start of the first subfield of the next field.
- FIG. 5 and FIG. 7 show diagrams in which the opening / closing control of the shutter is instantaneously switched without delay in time, as described in the embodiment 1.
- switching between opening and closing of the shutter takes time according to the material constituting the shutter. Therefore, in the plasma display device shown in the embodiment of the present invention, the timing of the shutter control signal is set in consideration of these times.
- a downward ramp waveform voltage is generated and applied to scan electrode SC1 through scan electrode SCn between the end of subfield SF5 and before the start of subfield SF1, and voltage Ve1
- the voltage is applied to sustain electrode SU1 through sustain electrode SUn.
- these voltages may not be generated.
- scan electrode SC1 through scan electrode SCn, sustain electrode SU1 through sustain electrode SUn, and data electrode D1 through data electrode Dm are all set to 0 (V).
- maintain may be sufficient.
- the number of subfields constituting one field is not limited to the above number.
- the number of gradations that can be displayed on the panel 10 can be further increased.
- the luminance weight of the subfield is set to a power of “2”, and the luminance weight of each subfield of subfield SF1 to subfield SF5 is (16, 8, 4, 2, 1).
- the luminance weight set in each subfield is not limited to the above numerical values. For example, by giving redundancy to the combination of subfields that determine the gradation as (12, 7, 3, 2, 1), etc., it is possible to perform coding while suppressing the occurrence of a moving image pseudo contour.
- the number of subfields constituting one field, the luminance weight of each subfield, and the like may be appropriately set according to the characteristics of the panel 10, the specifications of the plasma display device 40, and the like.
- each circuit block shown in the embodiment of the present invention may be configured as an electric circuit that performs each operation shown in the embodiment, or a microcomputer that is programmed to perform the same operation. May be used.
- the drive circuit described above is merely an example, and the configuration of the drive circuit is not limited to the configuration described above.
- the specific numerical values shown in the embodiment of the present invention are set based on the characteristics of the panel 10 having a screen size of 50 inches and the number of display electrode pairs 24 of 1024. It is just an example. The present invention is not limited to these numerical values, and each numerical value is desirably set optimally in accordance with the characteristics of the panel and the specifications of the plasma display device. Each of these numerical values is allowed to vary within a range where the above-described effect can be obtained. Also, the number of subfields constituting one field, the luminance weight of each subfield, etc. are not limited to the values shown in the embodiment of the present invention, and the subfield configuration is based on the image signal or the like. It may be configured to switch.
- the present invention can reduce crosstalk and improve image display quality for a user who views a 3D image displayed on a panel through shutter glasses in a plasma display device that can be used as a 3D image display device. Therefore, it is useful as a plasma display device and a plasma display system.
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Abstract
Description
図1は、本発明の実施の形態1におけるプラズマディスプレイ装置に用いるパネル10の構造を示す分解斜視図である。ガラス製の前面基板21上には、走査電極22と維持電極23とからなる表示電極対24が複数形成されている。そして、走査電極22と維持電極23とを覆うように誘電体層25が形成され、その誘電体層25上に保護層26が形成されている。
図7は、本発明の実施の形態2におけるプラズマディスプレイ装置のサブフィールド構成およびシャッタ眼鏡50の開閉制御の一例を概略的に示す図である。
21 前面基板
22 走査電極
23 維持電極
24 表示電極対
25,33 誘電体層
26 保護層
31 背面基板
32 データ電極
34 隔壁
35 蛍光体層
40 プラズマディスプレイ装置
41 画像信号処理回路
42 データ電極駆動回路
43 走査電極駆動回路
44 維持電極駆動回路
45 タイミング発生回路
46 制御信号出力部
50 シャッタ眼鏡
52R 右目用シャッタ
52L 左目用シャッタ
Claims (4)
- 放電セルを複数配列したプラズマディスプレイパネルおよび前記プラズマディスプレイパネルを駆動する駆動回路を有し、右目用画像信号を表示する右目用フィールドと左目用画像信号を表示する左目用フィールドとを交互に繰り返して前記プラズマディスプレイパネルに画像を表示するプラズマディスプレイ装置と、
前記右目用フィールドにもとづき開閉する右目用シャッタおよび前記左目用フィールドにもとづき開閉する左目用シャッタを有するシャッタ眼鏡とを備えたプラズマディスプレイシステムであって、
前記プラズマディスプレイ装置は、
前記右目用フィールドおよび前記左目用フィールドのそれぞれを、輝度重みが設定された複数のサブフィールドで構成するとともに、1フィールドの最初のサブフィールドの輝度重みを最も大きくし、それ以降は輝度重みが順次小さくなるように各サブフィールドに輝度重みを設定し、
前記右目用フィールドの最初に書込み動作を行うサブフィールドの維持期間の前に前記右目用シャッタを開き、前記右目用フィールドの次の左目用フィールドの前に前記右目用シャッタを閉じ、前記左目用フィールドの最初に書込み動作を行うサブフィールドの維持期間の前に前記左目用シャッタを開き、前記左目用フィールドの次の右目用フィールドの前に前記左目用シャッタを閉じるように前記シャッタ眼鏡を制御する
ことを特徴とするプラズマディスプレイシステム。 - 放電セルを複数配列したプラズマディスプレイパネルおよび前記プラズマディスプレイパネルを駆動する駆動回路を有し、右目用画像信号を表示する右目用フィールドと左目用画像信号を表示する左目用フィールドとを交互に繰り返して前記プラズマディスプレイパネルに画像を表示するプラズマディスプレイ装置と、
前記右目用フィールドにもとづき開閉する右目用シャッタおよび前記左目用フィールドにもとづき開閉する左目用シャッタを有するシャッタ眼鏡とを備えたプラズマディスプレイシステムであって、
前記プラズマディスプレイ装置は、
前記右目用フィールドおよび前記左目用フィールドのそれぞれを、輝度重みが設定された複数のサブフィールドで構成するとともに、1フィールドの最初のサブフィールドの輝度重みを最も大きくし、それ以降は輝度重みが順次小さくなるように各サブフィールドに輝度重みを設定し、
前記右目用フィールドにおいて、前記右目用シャッタを開く際には、1フィールドの最初のサブフィールドで書込み動作を行うときには前記最初のサブフィールドの維持期間の前に前記右目用シャッタを開き、前記最初のサブフィールドで書込み動作を行わないときには前記最初のサブフィールドの次のサブフィールドの維持期間の前に前記右目用シャッタを開き、前記右目用シャッタを閉じる際には、前記右目用フィールドの次の左目用フィールドの前に前記右目用シャッタを閉じ、
前記左目用フィールドにおいて、前記左目用シャッタを開く際には、1フィールドの最初のサブフィールドで書込み動作を行うときには前記最初のサブフィールドの維持期間の前に前記左目用シャッタを開き、前記最初のサブフィールドで書込み動作を行わないときには前記最初のサブフィールドの次のサブフィールドの維持期間の前に前記左目用シャッタを開き、前記左目用シャッタを閉じる際には、前記左目用フィールドの次の右目用フィールドの前に前記左目用シャッタを閉じるように前記シャッタ眼鏡を制御する
ことを特徴とするプラズマディスプレイシステム。 - 放電セルを複数配列したプラズマディスプレイパネルおよび前記プラズマディスプレイパネルを駆動する駆動回路を有し、右目用画像信号を表示する右目用フィールドと左目用画像信号を表示する左目用フィールドとを交互に繰り返して前記プラズマディスプレイパネルに画像を表示するプラズマディスプレイ装置であって、
前記駆動回路は、
前記右目用フィールドおよび前記左目用フィールドのそれぞれを、輝度重みが設定された複数のサブフィールドで構成するとともに、1フィールドの最初のサブフィールドの輝度重みを最も大きくし、それ以降は輝度重みが順次小さくなるように各サブフィールドに輝度重みを設定し、
右目用シャッタおよび左目用シャッタを有するシャッタ眼鏡に対し、
前記右目用フィールドの最初に書込み動作を行うサブフィールドの維持期間の前に前記右目用シャッタを開き、前記右目用フィールドの次の左目用フィールドの前に前記右目用シャッタを閉じ、前記左目用フィールドの最初に書込み動作を行うサブフィールドの維持期間の前に前記左目用シャッタを開き、前記左目用フィールドの次の右目用フィールドの前に前記左目用シャッタを閉じるように制御信号を発生する
ことを特徴とするプラズマディスプレイ装置。 - 放電セルを複数配列したプラズマディスプレイパネルおよび前記プラズマディスプレイパネルを駆動する駆動回路を有し、右目用画像信号を表示する右目用フィールドと左目用画像信号を表示する左目用フィールドとを交互に繰り返して前記プラズマディスプレイパネルに画像を表示するプラズマディスプレイ装置であって、
前記駆動回路は、
前記右目用フィールドおよび前記左目用フィールドのそれぞれを、輝度重みが設定された複数のサブフィールドで構成するとともに、1フィールドの最初のサブフィールドの輝度重みを最も大きくし、それ以降は輝度重みが順次小さくなるように各サブフィールドに輝度重みを設定し、
右目用シャッタおよび左目用シャッタを有するシャッタ眼鏡に対し、
前記右目用フィールドにおいて、前記右目用シャッタを開く際には、1フィールドの最初のサブフィールドで書込み動作を行うときには前記最初のサブフィールドの維持期間の前に前記右目用シャッタを開き、前記最初のサブフィールドで書込み動作を行わないときには前記最初のサブフィールドの次のサブフィールドの維持期間の前に前記右目用シャッタを開き、前記右目用シャッタを閉じる際には、前記右目用フィールドの次の左目用フィールドの前に前記右目用シャッタを閉じ、
前記左目用フィールドにおいて、前記左目用シャッタを開く際には、1フィールドの最初のサブフィールドで書込み動作を行うときには前記最初のサブフィールドの維持期間の前に前記左目用シャッタを開き、前記最初のサブフィールドで書込み動作を行わないときには前記最初のサブフィールドの次のサブフィールドの維持期間の前に前記左目用シャッタを開き、前記左目用シャッタを閉じる際には、前記左目用フィールドの次の右目用フィールドの前に前記左目用シャッタを閉じるように制御信号を発生する
ことを特徴とするプラズマディスプレイ装置。
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CN2011800057396A CN102714011A (zh) | 2010-03-09 | 2011-03-02 | 等离子显示装置及等离子显示系统 |
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