EP0887785A2 - Controlling the gray scale of plasma display devices - Google Patents
Controlling the gray scale of plasma display devices Download PDFInfo
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- EP0887785A2 EP0887785A2 EP98203252A EP98203252A EP0887785A2 EP 0887785 A2 EP0887785 A2 EP 0887785A2 EP 98203252 A EP98203252 A EP 98203252A EP 98203252 A EP98203252 A EP 98203252A EP 0887785 A2 EP0887785 A2 EP 0887785A2
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- gray level
- brightness
- subframe
- sustain
- subframes
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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
- G09G3/2029—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
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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
- G09G3/293—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 address discharge
- G09G3/2932—Addressed by writing selected cells that are in an OFF state
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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
- G09G3/293—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 address discharge
- G09G3/2935—Addressed by erasing selected cells that are in an ON state
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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
- G09G3/2946—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 by introducing variations of the frequency of sustain pulses within a frame or non-proportional variations of the number of sustain pulses in each subfield
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- G—PHYSICS
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- 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
- G09G3/298—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 using surface discharge 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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0228—Increasing the driving margin in plasma displays
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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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/046—Dealing with screen burn-in prevention or compensation of the effects thereof
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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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
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
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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
- G09G3/292—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 reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
- G09G3/2927—Details of initialising
Definitions
- An AC PDP may make use of the memory effect.
- AC PDPs there has been considered a two-electrode type in which selective discharge (address discharge) and sustain discharge are carried out with two electrodes, and a three-electrode type in which the third electrode is used for address discharge.
- a phosphor formed in a discharge cell is excited by ultraviolet rays generated by the discharge.
- the phosphor is easily affected by bombardment of ions (positive charges) generated concurrently by discharge.
- the plasma display device may be a three-electrode surface discharge AC plasma display device.
- the three-electrode surface discharge AC plasma display device may comprise first and second electrodes arranged in parallel with each other, and third electrodes orthogonal to the first and second electrodes, the first electrode being commonly connected together, and the second electrodes being arranged for display lines, respectively, wherein the display device has a surface discharge structure employing wall charges as memory media.
- the number of sustain emissions of the each subframe may be so calculated, on the basis of actually measured data of the brightness with respect to the numbers of sustain emissions, that the sum of the absolute values of errors with the ideal values in the each gray level may become minimum, in order to make the relation between the gray level and the corresponding brightness linear.
- the brightness of the second subframe having next larger gray level than that of the first subframe may not exceed the brightness of the first subframe, for the brightness of the first subframe having the arbitrary gray level.
- the sum of the numbers of sustain emissions of one or two subframes in the plurality of subframes, or the sum of the numbers of sustain emissions of two or three subframes may be specified.
- the brightness of the subframe having the maximum gray level may be specified in the plurality of subframes.
- an embodiment of the present invention may be put into effect by a three-electrode surface-discharge AC plasma display device comprising first and second electrodes arranged in parallel with each other; and third electrodes orthogonal to the first and second electrodes, the first electrode being commonly connected together, and the second electrodes being arranged for display lines, respectively, wherein the display has a surface discharge structure employing wall charges as memory media, the plasma display device is driven by separate address periods in which display data are written in the whole screen by forming a wall charge, the wall charge is necessary for sustain discharge according to the display data from sustain discharge periods in which sustain discharge for light emission is repeated, one frame forming an image is constituted by a plurality of subframes each having a different brightness, the number of sustain emissions of the each subframe is individually set for the each subframe, and the image is displayed on the plasma display device by a gray scale display having a predetermined brightness.
- the memory unit may be constituted by a vacant area of a driving wave-form memory device in the plasma display device, and the information on the number of sustain emissions in the each subframe may be set in the vacant area of the driving wave-form memory device.
- the plasma display device may further comprise a brightness controller for adjusting the brightness, and the brightness controller may select one piece from the information on the number of sustain emissions in the each subframe set in the memory unit.
- the number of sustain emissions in the each subframe may be set as a plurality of combinations in the memory unit, and an arbitrary one of the plurality of combinations may be selected by unit of selection signals supplied from the outside of the plasma display device.
- the plasma display device may further comprise a consumed current controller unit for controlling and keeping the consumed current below a predetermined value, the number of sustain emissions in the each subframe may be set as a plurality of combinations in the memory unit, an arbitrary one of the plurality of combinations may be selected in response to the output from the consumed current controller unit, and thereby the power consumption may be kept constant regardless of the change of display rate.
- the information on the number of sustain emissions in the each subframe may be supplied from outside the plasma display device.
- reference mark X-UD denotes a signal (outputs Vs/Vw) for controlling the ON/OFF of the X common driver (22)
- X-DD denotes a signal (GND) for controlling the ON/OFF of the common driver
- Y-UD denotes a signal (outputs Vs/Vw) for controlling the ON/OFF of the Y common driver (24)
- Y-DD denotes a signal (GND) for controlling the ON/OFF of the Y common driver.
- each of the address electrodes 3 is connected to the address driver 21 and gets an address pulse of the address discharge time from the address driver.
- the Y electrodes 8 are individually connected to the Y scan driver, and the Y scan driver 23 is connected to the Y common driver (Y driver 24).
- the pulse of address discharge time is generated from the Y scan driver 23, and the sustain pulses and others come from the Y driver 24 and are applied to the Y electrodes 8 through the Y scan driver 23.
- the X electrodes 7 are commonly connected over the display lines of the panel 30, and the X common driver (X driver 22) generates write pulses, sustain pulses, and the like.
- These driver circuits (21, 22, 23, 24) are controlled by the control circuit 10, which is controlled by synchronous signals, display data signals and others supplied from outside of the device.
- one aspect of the driving method shown in Fig. 4 is that the states of all the cells are equalized by whole-screen writing and whole-screen erasing which are carried out at the beginning of the address period and the whole-screen erasing is completed in the state where wall charges available in the subsequent line sequential writing discharge remain.
- the Y electrodes are brought to the GND level, and at the same time, write pulses of the voltage Vw are applied to the X electrodes causing the whole-screen writing. At this time, ions of positive charges are accumulated to the address electrode, in reality on the surface of dielectric material such as phosphor. Further, in the next step, by applying erasing pulses of the voltage Ve, the whole-screen erasing is carried out.
- the erasing discharge which makes the state in which there is no wall charge on the surface of the dielectric layer (MgO layer) of the X and Y electrodes, it is preferable to accumulate electrons, negative charges advantageous in the next addressing discharge on the MgO surface of Y electrode. Note that the voltage value of the residual wall charges should be at such a level as not to cause the sustain discharge even when sustain discharge pulses are applied to the X and Y electrodes.
- FIGs 5A to 5D are diagrams illustrating how cells are driven in the plasma display device of Fig. 3.
- Figs. 5A to 5D show diagrams of the arrangement of charges within a discharge cell and the state of discharge.
- Fig. 5A shows the whole-screen (or overall) writing step (Positive charges (or ions) have accumulated on the address electrode.)
- Fig. 5B shows the whole-cell sustain discharge step
- Fig. 5C shows the whole-cell erasing step (The wall charge of the sustain discharge electrode is reduced to such a value as not to cause discharge even when sustain discharge voltage (Vs) is applied).
- Vs sustain discharge voltage
- Fig. 5D shows the selective writing step (address discharge: Writing discharge is done utilizing the wall charge of the address electrode).
- Figure 6 shows timing chart for driving the plasma display device of Fig. 3, and shows the driving method in case of the 16 gray scales.
- one frame is divided into four subframes (or subfields) SF1, SF2, SF3, and SF4.
- the address periods Ta1, Ta2, Ta3, and Ta4 including the whole-screen writing periods Tw1, Tw2, Tw3, and Tw4 are of the identical length (time).
- the lengths (periods of time) of the sustain discharge periods Ts1, Ts2, Ts3, and Ts4 are of the rate 1:2:4:8. Therefore, it is possible to display in 16 scales of brightness from 0 to 15 by selecting subframes to be lightened.
- the brightness should be in linear relationship with the number of sustain discharges. If so, the relationship of the brightness with respect to the gray level (or the value of gray scale) is also linear.
- the optimum numbers of sustain pulses are such, P1, P2, and P3, as to minimize bSl in the equation (12) which satisfies the conditions of the equations (4) to (11) when the equation (1) is obtained in first by actual measurement and the equation (2) is set.
- the numbers of sustain emissions of each subframe in case when the sum of the squares of errors in each gray level with respect to the ideal values becomes minimum is calculated on the basis of data of the brightness actually measured for the numbers of sustain emissions.
- the calculations are complex as compared with the embodiment shown in Fig. 8, but a result very close to optimum can be found.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Plasma & Fusion (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of Gas Discharge Display Tubes (AREA)
Abstract
Description
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
BRIGHTNESS Cd/ | 0 | 15 | 30 | 43 | 60 | 66 | 71 | 76 |
NUMBER OF SUSTAIN | 0 | 15 | 30 | 45 | 80 | 95 | 110 | 125 |
Claims (10)
- A method of controlling the gray scale of a plasma display device, comprising the steps of:forming a frame for an image by a plurality of subframes each having a specific weight value; anddisplaying an image on said plasma display device by optionally combining gray levels of said plurality of subframes; characterised in that:a ratio of brightnesses of each gray level is calculated so as to substantially correspond with a ratio of the specific weight values of each gray level, a ratio of numbers of sustain emissions of each gray level being not coincident with the ratio of the specific weight values of each gray level.
- A method as claimed in claim 1, wherein the number of sustain emissions of said each subframe is so calculated, that the sum of the squares of errors with the ideal values in said each gray level becomes a minimum, in order to make the relation between the gray level and the corresponding brightness linear.
- A method as claimed in claim 2, wherein the brightness of one subframe of said plurality of subframes having a next higher gray level than that of another subframe of said plurality of subframes does not exceed the brightness of said another subframe, for the brightness of said another subframe having said arbitrary gray level.
- A method as claimed in claim 2, wherein the sum of the numbers of sustain emissions of several subframes in said plurality of subframes is specified.
- A method as claimed in claim 2, wherein the brightness of an optional subframe is specified in said plurality of subframes.
- A method as claimed in claim 1, wherein the number of sustain emissions of each said subframe is so calculated, that the sum of the absolute values of errors with the ideal values in said each gray level becomes a minimum, in order to make the relation between the gray level and the corresponding brightness linear.
- A method as claimed in claim 6, wherein the brightness of one said subframe having a next higher gray level than that of another subframe does not exceed the brightness of said another subframe, for the brightness of said another subframe having said arbitrary gray level.
- A method as claimed in claim 6, wherein the sum of the numbers of sustain emissions of several subframes in said plurality of subframes is specified.
- A method as claimed in claim 6, wherein the brightness of an optional subframe is specified in said plurality of subframes.
- A plasma display device comprising at least one pair of electrodes for carrying out a discharge operation, said plasma display device being driven by separating address periods, in which display data necessary for sustaining a discharge are written in the screen, from sustain discharge periods in which a sustain discharge for light emission is repeated, one frame forming an image being constituted by a plurality of subframes each having a weight value, respectively, and an image on said plasma display device being displayed by optionally combining gray levels of said plurality of subframes;
characterised in that a ratio of brightnesses of each gray level is calculated so as to substantially correspond with a ratio of the respective weight values of each gray level, and a ratio of numbers of sustain emissions of each gray level is not coincident with the ratio of the respective weight values of each gray level.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28834593 | 1993-11-17 | ||
JP288345/93 | 1993-11-17 | ||
JP5288345A JP2856241B2 (en) | 1993-11-17 | 1993-11-17 | Gradation control method for plasma display device |
EP94300695A EP0653740B1 (en) | 1993-11-17 | 1994-01-31 | Controlling the gray scale of plasma display devices |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94300695A Division EP0653740B1 (en) | 1993-11-17 | 1994-01-31 | Controlling the gray scale of plasma display devices |
Publications (3)
Publication Number | Publication Date |
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EP0887785A2 true EP0887785A2 (en) | 1998-12-30 |
EP0887785A3 EP0887785A3 (en) | 2000-03-29 |
EP0887785B1 EP0887785B1 (en) | 2002-11-06 |
Family
ID=17729008
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98203252A Expired - Lifetime EP0887785B1 (en) | 1993-11-17 | 1994-01-31 | Controlling the gray scale of plasma display devices |
EP94300695A Expired - Lifetime EP0653740B1 (en) | 1993-11-17 | 1994-01-31 | Controlling the gray scale of plasma display devices |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94300695A Expired - Lifetime EP0653740B1 (en) | 1993-11-17 | 1994-01-31 | Controlling the gray scale of plasma display devices |
Country Status (4)
Country | Link |
---|---|
EP (2) | EP0887785B1 (en) |
JP (1) | JP2856241B2 (en) |
KR (1) | KR970000911B1 (en) |
DE (2) | DE69424122T2 (en) |
Cited By (2)
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DE19856436A1 (en) * | 1998-12-08 | 2000-06-15 | Thomson Brandt Gmbh | Method for driving a plasma screen |
EP1594114A2 (en) * | 2004-05-07 | 2005-11-09 | Pioneer Corporation | Display device |
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DE69529716T2 (en) * | 1994-10-06 | 2003-07-17 | Fujitsu General Ltd | Gray scale processing using an error diffusion technique |
JP3499058B2 (en) * | 1995-09-13 | 2004-02-23 | 富士通株式会社 | Driving method of plasma display and plasma display device |
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JP3672697B2 (en) * | 1996-11-27 | 2005-07-20 | 富士通株式会社 | Plasma display device |
TW371386B (en) * | 1996-12-06 | 1999-10-01 | Matsushita Electric Ind Co Ltd | Video display monitor using subfield method |
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DE19720876A1 (en) * | 1997-05-17 | 1998-11-19 | Grundig Ag | Method and device for adjusting the contrast in pulse-width-controlled image displays |
KR19990011906A (en) * | 1997-07-25 | 1999-02-18 | 구자홍 | Sub-frame driving method of color plasma display panel |
JP2994631B2 (en) | 1997-12-10 | 1999-12-27 | 松下電器産業株式会社 | Drive pulse control device for PDP display |
JP2994630B2 (en) | 1997-12-10 | 1999-12-27 | 松下電器産業株式会社 | Display device capable of adjusting the number of subfields by brightness |
DE19756653A1 (en) * | 1997-12-19 | 1999-06-24 | Grundig Ag | Device for avoiding overheating of a plasma display |
DE19800846C2 (en) * | 1998-01-13 | 1999-12-09 | Grundig Ag | Device for avoiding overheating of a display driver component of a plasma display |
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JP3544855B2 (en) * | 1998-03-26 | 2004-07-21 | 富士通株式会社 | Display unit power consumption control method and device, display system including the device, and storage medium storing program for implementing the method |
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JP3399853B2 (en) * | 1998-09-30 | 2003-04-21 | 三菱電機株式会社 | Display panel display control circuit |
EP1022714A3 (en) | 1999-01-18 | 2001-05-09 | Pioneer Corporation | Method for driving a plasma display panel |
JP3580732B2 (en) * | 1999-06-30 | 2004-10-27 | 富士通株式会社 | Plasma display panel to keep color temperature or color deviation constant |
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JP2001265277A (en) * | 2000-02-29 | 2001-09-28 | Lg Electronics Inc | Color temperature adjusting method for plasma display panel |
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DE10112622A1 (en) * | 2001-03-14 | 2002-09-19 | Grundig Ag | Method and device for improving the gray value resolution of a pulse width controlled image display device |
JP4698070B2 (en) * | 2001-06-07 | 2011-06-08 | パナソニック株式会社 | Plasma display panel driving method and plasma display apparatus |
JP4707887B2 (en) * | 2001-07-11 | 2011-06-22 | パナソニック株式会社 | Display control device and display device |
US7098876B2 (en) | 2001-09-06 | 2006-08-29 | Samsung Sdi Co., Ltd. | Image display method and system for plasma display panel |
EP1331624A1 (en) * | 2002-01-23 | 2003-07-30 | Koninklijke Philips Electronics N.V. | Method of and apparatus for driving a plasma display panel |
JP5049445B2 (en) * | 2002-03-15 | 2012-10-17 | 株式会社日立製作所 | Display device and driving method thereof |
JP2004085607A (en) | 2002-08-22 | 2004-03-18 | Seiko Epson Corp | Image display device, image display method, and image display program |
EP1544838A1 (en) * | 2003-12-17 | 2005-06-22 | Deutsche Thomson-Brandt Gmbh | Method and device for compensating effect of differences in subfield load |
JP5128818B2 (en) * | 2003-12-17 | 2013-01-23 | トムソン ライセンシング | Method and apparatus for reducing row load effect |
EP1544837A1 (en) * | 2003-12-17 | 2005-06-22 | Deutsche Thomson-Brandt Gmbh | Method and device for reducing the effect of differences in scan line load |
JP4563787B2 (en) * | 2004-12-10 | 2010-10-13 | 日立プラズマディスプレイ株式会社 | Plasma display device and control method thereof |
KR100667540B1 (en) * | 2005-04-07 | 2007-01-12 | 엘지전자 주식회사 | Plasma Display Apparatus and Driving Method thereof |
JP4653146B2 (en) * | 2007-07-25 | 2011-03-16 | 日立プラズマディスプレイ株式会社 | Plasma display device and control method thereof |
KR20090125497A (en) * | 2008-06-02 | 2009-12-07 | 엘지전자 주식회사 | Plasma display apparatus and method for driving thereof |
JP4653233B2 (en) * | 2009-11-19 | 2011-03-16 | 日立プラズマディスプレイ株式会社 | Plasma display device and display method thereof |
JP4564095B2 (en) * | 2009-11-19 | 2010-10-20 | 日立プラズマディスプレイ株式会社 | Plasma display device |
JP4653246B2 (en) * | 2010-04-16 | 2011-03-16 | 日立プラズマディスプレイ株式会社 | Plasma display device and display method thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0488891A2 (en) * | 1990-11-28 | 1992-06-03 | Fujitsu Limited | A method and a circuit for gradationally driving a flat display device |
-
1993
- 1993-11-17 JP JP5288345A patent/JP2856241B2/en not_active Expired - Lifetime
-
1994
- 1994-01-31 KR KR1019940001769A patent/KR970000911B1/en not_active IP Right Cessation
- 1994-01-31 DE DE69424122T patent/DE69424122T2/en not_active Expired - Lifetime
- 1994-01-31 DE DE69431681T patent/DE69431681T2/en not_active Expired - Lifetime
- 1994-01-31 EP EP98203252A patent/EP0887785B1/en not_active Expired - Lifetime
- 1994-01-31 EP EP94300695A patent/EP0653740B1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0488891A2 (en) * | 1990-11-28 | 1992-06-03 | Fujitsu Limited | A method and a circuit for gradationally driving a flat display device |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19856436A1 (en) * | 1998-12-08 | 2000-06-15 | Thomson Brandt Gmbh | Method for driving a plasma screen |
US6417823B1 (en) | 1998-12-08 | 2002-07-09 | Thomson Licensing S.A. | Method of driving a plasma screen |
EP1594114A2 (en) * | 2004-05-07 | 2005-11-09 | Pioneer Corporation | Display device |
EP1594114A3 (en) * | 2004-05-07 | 2009-09-16 | Pioneer Corporation | Display device |
Also Published As
Publication number | Publication date |
---|---|
KR970000911B1 (en) | 1997-01-21 |
JP2856241B2 (en) | 1999-02-10 |
JPH07140928A (en) | 1995-06-02 |
DE69424122T2 (en) | 2001-02-01 |
EP0653740A2 (en) | 1995-05-17 |
EP0653740A3 (en) | 1996-06-26 |
EP0887785B1 (en) | 2002-11-06 |
DE69424122D1 (en) | 2000-05-31 |
DE69431681D1 (en) | 2002-12-12 |
EP0887785A3 (en) | 2000-03-29 |
EP0653740B1 (en) | 2000-04-26 |
DE69431681T2 (en) | 2003-03-13 |
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