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EP1039438A1 - Méthode de commande d'un panneau d'affichage à plasma et dispositif d'affichage l'utilisant cette méthode - Google Patents

Méthode de commande d'un panneau d'affichage à plasma et dispositif d'affichage l'utilisant cette méthode Download PDF

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Publication number
EP1039438A1
EP1039438A1 EP99400742A EP99400742A EP1039438A1 EP 1039438 A1 EP1039438 A1 EP 1039438A1 EP 99400742 A EP99400742 A EP 99400742A EP 99400742 A EP99400742 A EP 99400742A EP 1039438 A1 EP1039438 A1 EP 1039438A1
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Prior art keywords
subfield
during
erasing
line
addressing
Prior art date
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EP99400742A
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German (de)
English (en)
Inventor
Y. Thomson Multimedia Chikazawa
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Vantiva SA
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Thomson Multimedia SA
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Priority to EP99400742A priority Critical patent/EP1039438A1/fr
Priority to EP00400457A priority patent/EP1039437A1/fr
Priority to TW89103325A priority patent/TW525116B/zh
Priority to JP2000084379A priority patent/JP2000298452A/ja
Publication of EP1039438A1 publication Critical patent/EP1039438A1/fr
Withdrawn legal-status Critical Current

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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
    • G09G3/2937—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 being addressed only once per frame
    • 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
    • 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
    • G09G3/2025—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having all the same time duration
    • 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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0216—Interleaved control phases for different scan lines in the same sub-field, e.g. initialization, addressing and sustaining in plasma displays that are not simultaneous for all scan lines
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0218—Addressing of scan or signal lines with collection of electrodes in groups for n-dimensional addressing
    • 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
    • G09G2320/0238—Improving the black level
    • 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
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0266—Reduction of sub-frame artefacts
    • 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
    • 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
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • 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
    • G09G3/2925—Details of priming

Definitions

  • the invention relates to a method for controlling a plasma display panel and to a display apparatus using this method.
  • Plasma display panels used for image reproduction, such as for display of television images, are either of the AC type or of the DC type.
  • AC type will be only described here.
  • a PDP comprises a transparent front plate, to which is associated a first set of parallel electrodes, and a back substrate, associated with a second set of parallel electrodes, perpendicular to the first set.
  • the interval between the front and back plates is separated in cells containing a gas, for instance a mixture of Xenon and Neon, which, when selectively and properly excited by voltages applied to electrodes, produce ultraviolet (UV) light and this UV light excites phosphors deposited on walls of the cell and generate visible light.
  • a gas for instance a mixture of Xenon and Neon
  • PDPs are good solutions for the display of images, because they are flat and can be realized with an area which is greater than the areas of current displays such as cathode-ray tubes (CRTs) and liquid crystal displays (LCDs).
  • CRTs cathode-ray tubes
  • LCDs liquid crystal displays
  • the low contrast comes from the undesirable emission of light during periods which do not correspond to the controlled excitation of the gas in each cell.
  • the cells which must emit light are addressed.
  • the addressing is an operation similar to priming, i.e. charges are created on the walls of cells.
  • this addressing has a shorter duration than priming and is, of course, selective.
  • the duration of priming is about 15 ⁇ s and the duration of addressing is generally less than 3 ⁇ s.
  • a sustain voltage is applied to the addressed cells.
  • This sustain voltage is an alternative current (AC) at a high frequency, generally comprised between 100 and 500 kHz.
  • AC alternative current
  • This sustain voltage may be applied either between a front and a back electrodes or between two parallel electrodes on one side of the panel.
  • Each field is divided into, for instance, subfields having lengths which decrease from the first to the last subfield.
  • Each cell emits light during subfields which are selected in such a way that the luminance of a pixel corresponds to the addition of the times of active subfields.
  • the length of the sustain period in each subfield is such that the first subfield corresponds to the least significant bit (LSB) and the last subfield corresponds to the most significant bit (MSB). Therefore, if the duration of the sustain period of this subfield is 1, the durations of the subsequent subfields are respectively 2, 4, 8, 16, 32, 64 and 128, corresponding, respectively to the second, third, fourth, fifth, sixth, seventh and eighth subfields. Therefore, it is possible to obtain 256 levels of luminance, each luminance being expressed by a number of 8 bits.
  • each field has four bits, i.e. four subfields for which the sustain period is, respectively, 1, 2, 4 and 8.
  • the luminance of pixels a and b is 8; this means that only the fourth subfield emits light and the first three subfields remain dark.
  • the eye e of the viewer follows the movement of the moving contour, when the luminance decreases from 8 to 7.
  • This following movement is represented by the oblique lines 10, 12, 14 on figure 2.
  • the oblique line 10 corresponds to a black line and the luminance increases from this line 10 to the parallel lines respectively 12 and 14.
  • the eye does not see a black line, but a relatively dark or blurred contour which is quite unpleasant.
  • the invention eliminates the drawbacks mentioned herein above, i.e. it increases the contrast and it prevents blurring due to certain moving images as described with figure 2.
  • the erasing is limited to the cells for which no emission is necessary in the corresponding subfield and for the subsequent subfields in the same field.
  • the invention provides a selective erasing and not an erasing for all the cells. Therefore, the emission of unnecessary light due to erasing is limited and the contrast is improved.
  • the addressing is simultaneous to the erasing. Therefore, the duration of the control part of each subfield is reduced.
  • all the subfields have the same duration. Therefore, the control of the PDP is simplified.
  • Figure 4 shows clearly the difference between the invention and the prior art as represented on figure 3.
  • the cells are lit during successive subfield(s) starting from subfield 1 and, if they must not produce maximum luminance, they are extinguished during the last subfield(s).
  • erasing E 1 is necessary only for the cells which must not generate light during the current subfield and the subsequent subfield(s). It is therefore possible to perform simultaneously erasing E 1 for such selected cells, and addressing A for the other cells of the PDP.
  • One advantage is the improvement of contrast of the image because the total duration of erasing periods is much smaller in the PDP according to the invention than in the conventional PDP. Moreover, as will be explained hereinafter with reference to figure 13, the generation of light only from subfield 1 and successive subfield(s) provides the advantage that no blurring occurs, contrary to what happens with conventional PDPs as explained above with figure 2.
  • Figure 6 represents the control of the successive lines.
  • the number of lines is 480 and the E 1 , E 2 periods must be distributed in time in such a way that no interference may happen between the control of successive lines.
  • the priming P is performed simultaneously for all the cells and the E 1 , E 2 , E 3 ... periods are contiguous from one line to the subsequent line, without any overlapping.
  • each line begins with respect to the previous line, after a delay which equals the duration of an E 1 period.
  • This delay from one line to the other entails a "suspending" period SP 1 ... SP 480 between the end of the priming P and the beginning of E 1 period.
  • This suspending period SP n is maximum for the last line 480. During this suspending period, no luminance signal is generated. It is also to be noted that corresponding suspending periods SP' n are provided at the end of each line, i.e. between the end of the last erasing/addressing period and the beginning of priming P for the next field. This suspending period SP' n is maximum for the first line and is equal to zero for the last line.
  • the suspending periods are suppressed.
  • the priming periods for successive lines are staggered, i.e. the priming periods are not simultaneous. More precisely, the priming P 2 period for line 2 appears immediately after the end of priming period P 1 , with no delay between the end of P 1 and the beginning of P 2 .
  • the erasing/addressing period for subfield 1 appears immediately after priming, with no delay.
  • the erasing/addressing periods for the other subfields: subfield 2, subfield 3, etc. they are staggered in such a way that for line n, this erasing/addressing period begins when the erasing/addressing period for line n - 1 finishes.
  • Figure 8 represents a cell of a PDP.
  • a plasma display panel comprises a front substrate (not shown) which is transparent and a back substrate (not shown).
  • the back substrate is provided with parallel ribs 13, 15 which constitute walls separating the space between the front and the back substrates. This space is filled with a mixture of gases such as Neon and Xenon.
  • An addressing electrode 16 is associated with each space between two neighboring partition ribs 13, 15. In this example, the addressing, or line, electrode 16 is on the middle of the space separating ribs 13 and 15, on the front side.
  • each cell is also associated a couple 18, 20 of electrodes on the backside. These electrodes are perpendicular to the ribs.
  • the electrode 20 is used for addressing and both electrodes 18 and 20 are used for the application of the AC sustain voltage.
  • a DC voltage is created between electrodes 16 and 20.
  • the cells C 11 , C 12 , etc. C 21 , C 22 , etc. are disposed according to a matrix with lines l 1 , l 2 , l 3 , etc. and columns, col 1 , col 2 , etc.
  • an addressing pulse 30 1 is generated on line 1 and, simultaneously, on each column is generated either an erasing pulse 32 1 , if the corresponding cell C 11 must be erased, or no pulse (zero pulse 32 2 ) is generated, if the corresponding cell C 12 must generate light.
  • the erasing pulses are generated simultaneously with the addressing pulses and have the same duration, i.e. 5 ⁇ s.
  • the erasing pulse 32 1 of column coil suppresses the wall charges only on cell C 11 , because, during its appearance, only line 1 is addressed and not the other lines.
  • each column electrode col 1 , col 2 comprises two electrodes 18, 20. During the sustain period, an AC current is applied between these electrodes. The AC voltage is applied after the erasing/addressing pulse until the end of the corresponding subfield. Only the non-erased cells emit light. As shown on figure 10, cell C 11 , which has been erased, remains black and cell C 12 , which has been addressed, generates light.
  • the total duration of addressing/ erasing is, for one frame (480 lines), 2.4 ms for each subfield, i.e. 12 ms for each field if 5 subfields are provided for 1 field.
  • the duration of one field is 16.7 ms
  • the duration of the remaining sustain period is 4.7 ms for each field, i.e. 1 ms for each subfield.
  • the number of possible luminance levels being limited, it is preferable to increase this number.
  • line 1 is addressed simultaneously with line 241
  • line 2 is addressed simultaneously with line 242
  • line 240 is addressed simultaneously with line 480.
  • a pulse 38 (figure 12) of 5 ⁇ s is applied to line 1 and, simultaneously, a pulse 39 of the same duration is applied to electrode A 1 .
  • line 2 is addressed with a pulse 40 beginning 1 ⁇ s after the beginning of the pulse 38 applied on line 1 and having also a duration of 5 ⁇ s. Simultaneously, a pulse 42 of duration 5 ⁇ s is also applied on column electrode A 2 of column col 1 . If cell C 21 must not be lit, no pulse 42 is applied on electrode A 2 .
  • one field may be divided into 38 subfields. In other words, it is possible to have 38 luminance levels for one color. For three colors, this may amount to 114 levels.
  • this number of luminance levels would be sufficient.
  • conventional technologies used for picture compression of for improving the quality of pictures transmitted by facsimile machines or computer displays are called dithering and error diffusion methods; these methods are conventionally used for personal computers (PCs) and LCDs (Liquid Crystal Displays).
  • Figure 13 is a diagram similar to figure 2 wherein, during field F 1 , the pixels a and b have the luminance level 8 and the pixels c and d have the level 7. During the field F 2 , pixels a and b keep their luminance level 8, but pixel c has the luminance 8 and pixel d keeps the level 7.
  • the sustain period will have duration to, and the sustain periods of subfields 2 to 7 will be respectively to, 2to, 3to, 4to, 5to and 6to.

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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)
  • Transforming Electric Information Into Light Information (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
EP99400742A 1999-03-26 1999-03-26 Méthode de commande d'un panneau d'affichage à plasma et dispositif d'affichage l'utilisant cette méthode Withdrawn EP1039438A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP99400742A EP1039438A1 (fr) 1999-03-26 1999-03-26 Méthode de commande d'un panneau d'affichage à plasma et dispositif d'affichage l'utilisant cette méthode
EP00400457A EP1039437A1 (fr) 1999-03-26 2000-02-18 Méthode de commande d'un panneau d'affichage à plasma et dispositif d'affichage utilisant cette méthode
TW89103325A TW525116B (en) 1999-03-26 2000-02-25 Method for controlling a plasma display panel and display apparatus using this method
JP2000084379A JP2000298452A (ja) 1999-03-26 2000-03-24 プラズマ表示パネルを制御する方法及びこの方法を使用する表示装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99400742A EP1039438A1 (fr) 1999-03-26 1999-03-26 Méthode de commande d'un panneau d'affichage à plasma et dispositif d'affichage l'utilisant cette méthode

Publications (1)

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EP1039438A1 true EP1039438A1 (fr) 2000-09-27

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EP99400742A Withdrawn EP1039438A1 (fr) 1999-03-26 1999-03-26 Méthode de commande d'un panneau d'affichage à plasma et dispositif d'affichage l'utilisant cette méthode
EP00400457A Withdrawn EP1039437A1 (fr) 1999-03-26 2000-02-18 Méthode de commande d'un panneau d'affichage à plasma et dispositif d'affichage utilisant cette méthode

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP00400457A Withdrawn EP1039437A1 (fr) 1999-03-26 2000-02-18 Méthode de commande d'un panneau d'affichage à plasma et dispositif d'affichage utilisant cette méthode

Country Status (3)

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EP (2) EP1039438A1 (fr)
JP (1) JP2000298452A (fr)
TW (1) TW525116B (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0762373A2 (fr) * 1995-08-03 1997-03-12 Fujitsu Limited Panneau d'affichage à plasma, méthode de commande de mise en oeuvre d'un balayage entrelacé, et appareil d'affichage à plasma
FR2740253A1 (fr) * 1995-10-24 1997-04-25 Fujitsu Ltd Procede et appareil d'excitation d'affichage
EP0833299A1 (fr) * 1996-09-25 1998-04-01 Nec Corporation Procédé d'expression d'échelle de gris et dispositif d'affichage d'échelle de gris
EP0834856A1 (fr) * 1996-10-01 1998-04-08 Lg Electronics Inc. Méthode de commande d'un panneau d'affichage à plasma à courant alternatif

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0762373A2 (fr) * 1995-08-03 1997-03-12 Fujitsu Limited Panneau d'affichage à plasma, méthode de commande de mise en oeuvre d'un balayage entrelacé, et appareil d'affichage à plasma
FR2740253A1 (fr) * 1995-10-24 1997-04-25 Fujitsu Ltd Procede et appareil d'excitation d'affichage
EP0833299A1 (fr) * 1996-09-25 1998-04-01 Nec Corporation Procédé d'expression d'échelle de gris et dispositif d'affichage d'échelle de gris
EP0834856A1 (fr) * 1996-10-01 1998-04-08 Lg Electronics Inc. Méthode de commande d'un panneau d'affichage à plasma à courant alternatif

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JP2000298452A (ja) 2000-10-24
EP1039437A1 (fr) 2000-09-27
TW525116B (en) 2003-03-21

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