WO2009090751A1 - Unité d'affichage à plasma et son procédé de traitement - Google Patents

Unité d'affichage à plasma et son procédé de traitement Download PDF

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Publication number
WO2009090751A1
WO2009090751A1 PCT/JP2008/050608 JP2008050608W WO2009090751A1 WO 2009090751 A1 WO2009090751 A1 WO 2009090751A1 JP 2008050608 W JP2008050608 W JP 2008050608W WO 2009090751 A1 WO2009090751 A1 WO 2009090751A1
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WIPO (PCT)
Prior art keywords
subfield
gradation
circuit
plasma display
image signal
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PCT/JP2008/050608
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English (en)
Japanese (ja)
Inventor
Masanori Takeuchi
Koji Nagata
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Hitachi, Ltd.
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Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to PCT/JP2008/050608 priority Critical patent/WO2009090751A1/fr
Publication of WO2009090751A1 publication Critical patent/WO2009090751A1/fr

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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
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • 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
    • G09G3/2059—Display of intermediate tones using error diffusion

Definitions

  • the present invention relates to a plasma display device and a processing method thereof.
  • a specific subfield lighting pattern is combined with a subfield lighting pattern of an adjacent pixel, so that a large gradation value is displayed for a human eye during animation.
  • a so-called moving image pseudo contour that appears as if there is a pseudo contour may be generated.
  • a technique for displaying an image without using a subfield lighting pattern that easily generates a moving image pseudo contour has been proposed (for example, see Patent Document 1).
  • the number of subfield lighting patterns is smaller than the number of input gradations, and gradation values that cannot be displayed by the subfield lighting pattern are subfield lighting patterns before and after the gradation value. Is expressed in combination with space or time. As a result, gradation expression is performed only with the subfield lighting pattern in which the moving image pseudo contour is less likely to occur. However, since the halftone that cannot be expressed by the subfield lighting pattern is expressed by error diffusion processing, granular noise may be seen in the display image depending on the gradation value.
  • a plasma display apparatus that includes a plurality of subfields each having a weighted number of sustain pulses, and that represents gradation of an image by selecting lighting or non-lighting of the subfield.
  • a measurement circuit that measures the appearance frequency of a specific gradation group in the first image signal for each field, and weights the plurality of subfields according to the appearance frequency measured by the measurement circuit.
  • the first image signal is nonlinearly converted into a second image signal so as not to use a predetermined lighting pattern
  • the second image signal A non-linear conversion circuit that expresses an image signal by a real part and an error part, and an error part of the error part of the second image signal subjected to error diffusion processing spatially or temporally.
  • a plasma display apparatus and a lighting pattern conversion circuit that replaces the predetermined lighting pattern in the other lighting patterns are provided.
  • the appearance frequency of a specific gradation group in the first image signal is measured, and the gradation group having a high appearance frequency has many gradations expressed without performing error diffusion processing and using a predetermined lighting pattern.
  • the weights of the plurality of subfields it is possible to reduce the number of pixels displayed by error diffusion and suppress the generation of granular noise while suppressing the generation of the moving image pseudo contour.
  • FIG. 1 is a diagram illustrating a configuration example of the plasma display device according to the first embodiment.
  • 2A is a diagram showing a cross-sectional configuration example of the display cell shown in FIG.
  • FIG. 2B is a diagram for explaining the panel capacity of the AC-driven plasma display panel.
  • FIG. 2C is a diagram for explaining light emission of the AC drive type plasma display.
  • FIG. 3 is a diagram illustrating a configuration example of one field of an image.
  • FIG. 4 is a diagram illustrating a configuration example of the histogram measurement circuit.
  • FIG. 5 is a diagram showing an example of the subfield arrangement selection table.
  • FIG. 6 is a diagram showing a first subfield arrangement and output gradation values in the first embodiment.
  • FIG. 7 is a diagram showing a second subfield arrangement and output gradation values in the first embodiment.
  • FIG. 8 is a diagram showing a third subfield arrangement and output gradation values in the first embodiment.
  • FIG. 9 is a diagram showing a fourth subfield arrangement and output gradation values in the first embodiment.
  • FIG. 10 is a diagram illustrating a configuration example of the plasma display device according to the second embodiment.
  • FIG. 1 is a diagram illustrating a configuration example of the plasma display device according to the first embodiment.
  • the plasma display device according to the first embodiment includes an inverse gamma conversion processing circuit 10, a delay circuit 20, a nonlinear gain circuit 30, an error diffusion circuit 40, a subfield conversion circuit 50, a display load factor detection circuit 60 for each subfield, a sustain pulse.
  • the address electrode drive circuit 121 supplies a predetermined voltage to the address electrodes A1, A2,.
  • each of the address electrodes A1, A2,... Or their generic name is referred to as an address electrode Aj, where j means a subscript.
  • the sustain electrode drive circuit 122 supplies a predetermined voltage to the X electrodes (sustain electrodes) X1, X2,.
  • X electrodes stain electrodes
  • Xi each of the X electrodes X1, X2,... Or their generic name is referred to as an X electrode Xi, and i means a subscript.
  • the scan electrode driving circuit 123 supplies a predetermined voltage to the Y electrodes (scan electrodes) Y1, Y2,.
  • Y electrodes scan electrodes
  • Y electrode Yi each of the Y electrodes Y1, Y2,... Or their generic name is referred to as a Y electrode Yi, and i means a subscript.
  • the Y electrode Yi and the X electrode Xi form a row extending in parallel in the horizontal direction, and the address electrode Aj forms a column extending in the vertical direction.
  • the Y electrodes Yi and the X electrodes Xi are alternately arranged in the vertical direction.
  • the Y electrode Yi and the address electrode Aj form a two-dimensional matrix with i rows and j columns.
  • the display cell Cij is formed by the intersection of the Y electrode Yi and the address electrode Aj and the X electrode Xi adjacent thereto corresponding thereto.
  • This display cell Cij corresponds to, for example, red, green, and blue sub-pixels, and one pixel is constituted by these three-color sub-pixels.
  • the plasma display panel 124 can display a two-dimensional image by lighting a plurality of pixels arranged two-dimensionally.
  • FIG. 2A is a diagram showing a cross-sectional configuration example of the display cell Cij in FIG.
  • the X electrode Xi and the Y electrode Yi are formed on the front glass substrate 211.
  • a dielectric layer 212 for insulating the discharge space 217 is deposited thereon, and an MgO (magnesium oxide) protective film 213 is further deposited thereon.
  • the address electrode Aj is formed on a rear glass substrate 214 disposed opposite to the front glass substrate 211, and a dielectric layer 215 is deposited thereon, and further a phosphor is deposited thereon. ing. Ne + Xe Penning gas or the like is sealed in the discharge space 217 between the MgO protective film 213 and the dielectric layer 215.
  • FIG. 2B is a diagram for explaining the panel capacitance Cp of the AC drive type plasma display panel.
  • the capacity Ca is the capacity of the discharge space 217 between the X electrode Xi and the Y electrode Yi.
  • the capacitance Cb is the capacitance of the dielectric layer 212 between the X electrode Xi and the Y electrode Yi.
  • the capacitance Cc is the capacitance of the front glass substrate 211 between the X electrode Xi and the Y electrode Yi. The sum of these capacitors Ca, Cb, and Cc determines the panel capacitance Cp between the electrodes Xi and Yi.
  • FIG. 2C is a diagram for explaining light emission of the AC drive type plasma display.
  • red, blue, and green phosphors 218 are arranged and applied in stripes for each color, and the phosphor 218 is excited by the discharge between the X electrode Xi and the Y electrode Yi to emit light. 221 is generated.
  • FIG. 3 is a diagram illustrating a configuration example of one field FD of an image.
  • the image is formed at 60 fields / second, for example.
  • One field FD is formed by a first subfield SF1, a second subfield SF2,..., An nth subfield SFn. This n is, for example, 10.
  • Each of the subfields SF1, SF2, etc. or their generic name is hereinafter referred to as a subfield SF.
  • Each subfield SF includes a reset period Tr, an address period Ta, and a sustain (sustain discharge) period Ts.
  • the reset period Tr the display cell is initialized.
  • the address period Ta light emission or non-light emission of each display cell can be selected by address discharge between the address electrode Aj and the Y electrode Yi.
  • the sustain period Ts a sustain discharge is performed between the X electrode Xi and the Y electrode Yi of the selected display cell to emit light.
  • the number of times of light emission (the length of the sustain period Ts) corresponding to the number of sustain pulses between the X electrode Xi and the Y electrode Yi is different. Thereby, the gradation value can be determined.
  • the plasma display panel 124 is composed of a plurality of subfields each having a weighted sustain pulse number, and the image is expressed in gradation by selecting a pattern of subfields to be lit among the plurality of subfields. Can do.
  • the inverse gamma conversion processing circuit 10 receives the digital image signal S1, performs inverse gamma conversion, and outputs an image signal S2 having linear characteristics.
  • the delay circuit 20 delays and outputs the image signal S2 for a predetermined time corresponding to the processing time in the histogram measurement circuit 130 and the subfield arrangement selection circuit 140.
  • the nonlinear gain circuit 30 nonlinearly converts the delayed image signal S2 into an image signal S3 so as not to use a specific subfield lighting pattern, and the image signal S3 is converted into an integer part (real part) and a decimal part (error part).
  • the nonlinear gain circuit 30 converts the image signal S2 into an image signal S3 based on a nonlinear parameter (mixing ratio distribution related to error diffusion processing) corresponding to the subfield arrangement selected by the subfield arrangement selection circuit 140.
  • the error diffusion circuit 40 receives the image signal S3. When the decimal part of the image signal S3 is not 0, the error diffusion circuit 40 spreads the decimal part spatially or temporally to generate an image signal S4 for performing pseudo gradation expression. Output.
  • a subfield lighting pattern signal S5 is generated.
  • the address electrode drive circuit 121 generates a voltage of the address electrode Aj for selecting a subfield to be lit for each pixel according to the subfield lighting pattern signal S5.
  • the display load factor detection circuit 60 for each subfield calculates a display load factor T2 for each subfield based on the subfield lighting pattern signal S5.
  • the display load factor is detected based on the number of pixels that emit light and the gradation value of the pixels that emit light. For example, when all the pixels of the image are displayed with the maximum gradation value, the display load factor is 100%. Further, when all the pixels of the image are displayed with 1/2 of the maximum gradation value, the display load factor is 50%. The display load factor is also 50% when only half (50%) of the image is displayed with the maximum gradation value.
  • the sustain pulse number setting circuit 70 inputs the timing signal T1 and the display load factor T2, and calculates the total sustain pulse number of one field by constant power control according to the display load factor of one field. Further, the sustain pulse number setting circuit 70 divides the total number of sustain pulses so as to be the ratio of the weights of the subfields according to the subfield arrangement selected by the subfield arrangement selection circuit 140.
  • the total number of sustain pulses in one field is controlled according to the display load factor in one field. Regardless of the display load factor, if the total number of sustain pulses in one field is made constant, the larger the display load factor, the larger the electric power and the greater the amount of heat. Therefore, when the display load factor of one field is large, calculation is performed so as to reduce the total number of sustain pulses in one field, and constant power control is performed.
  • the drive signal generation circuit 80 generates a sustain pulse signal for display according to the output of the sustain pulse number setting circuit 70.
  • the sustain electrode drive circuit 122 and the scan electrode drive circuit 123 generate voltages for the X electrode Xi and the Y electrode Yi in accordance with the sustain pulse signal.
  • the display cell selected by the address electrode Aj emits light by sustain discharge between the X electrode Xi and the Y electrode Yi.
  • the histogram measurement circuit 130 measures a histogram of a specific gradation group in the image signal for each field based on the image signal S2 output from the inverse gamma conversion processing circuit 10.
  • the subfield array selection circuit 140 selects one subfield array from a plurality of subfield arrays based on the measurement result of the histogram measurement circuit 130.
  • the subfield arrangement selection circuit 140 outputs the selected subfield arrangement to the sustain pulse setting circuit 70 and outputs a non-linear parameter corresponding thereto to the non-linear gain circuit 30.
  • the weights (luminance ratios) of the subfields constituting one field are set in each subfield array, and the weight ratios of the subfields are different between the subfield arrays.
  • the histogram measurement circuit 130 has a gradation group discrimination circuit 131, counters 132 to 134, and comparators 135 to 137.
  • the tone group discrimination circuit 131 receives the image signal S2 from the inverse gamma conversion processing circuit 10 and discriminates which tone group the input signal is from.
  • the gradation group includes the highest gradation value (gradation value before carry) among gradation values in which the largest subfield for lighting the display cell Cij is the n-th subfield, and the maximum lighting value.
  • the subfield is configured to include at least the lowest gradation value (gradation value after carry) of the gradation values of the (n + 1) th subfield.
  • the largest subfield to be lit may include a gradation value that is the next smallest to the lowest gradation value among the gradation values of the (n + 1) th subfield.
  • a plurality of tone values may be included in ascending order.
  • the gradation group includes the highest gradation value among gradation values in which the largest subfield for lighting the display cell Cij is the nth subfield, and the largest subfield for lighting (n + 1). ) It is assumed that the lowest gradation value among the gradation values which are the first subfield and the gradation value next to the lowest gradation value are included.
  • Counters 132 to 134 are provided corresponding to each gradation group.
  • the first gradation group counter 132 corresponding to the first gradation group
  • the second gradation group counter 133 corresponding to the second gradation group
  • the Nth gradation corresponding to the Nth gradation group A group counter 134 is illustrated.
  • Each of the counters 132 to 134 is reset (initialized) by the vertical synchronization signal, and counts up according to the determination result in the gradation group determination circuit 131, thereby obtaining the corresponding gradation group in the image signal.
  • the number of appearances of the gradation value to which it belongs is measured for each field.
  • Comparators 135 to 137 compare the values set in advance by the MPU 150 with the counter values measured by the counters 132 to 134 of each gradation value group, and according to the number of appearances of the gradation values belonging to the gradation group.
  • Appearance frequency coefficients AC1 to ACN are determined and output.
  • the number of pixels that display gradation values belonging to a gradation group exceeds 50% among all the pixels in one field, “2” is output as the appearance frequency coefficient of the gradation group.
  • “1” is output as the appearance frequency coefficient of the gradation group
  • “0” is output as the appearance frequency coefficient of the gradation group if it is lower than 15%.
  • the setting value for determining the appearance frequency coefficient may be made different depending on the gradation group by comparing with the counter values of the counters 132 to 134.
  • the difference is conspicuous in the low luminance part of the display image, and the difference is inconspicuous in the high luminance part, so set the setting value so that the appearance frequency coefficient is high in the low luminance gradation group.
  • the set value may be set so that the appearance frequency coefficient is low.
  • the subfield arrangement selection circuit 140 has a subfield arrangement selection table composed of a plurality of subfield arrangements as shown in FIG.
  • the subfield arrangement selection circuit 140 selects a subfield arrangement corresponding to the image to be displayed based on the appearance frequency coefficients AC1 to ACN of each gradation group output from the histogram measurement circuit 130, and nonlinearly according to the selection result.
  • the parameter of the gain circuit 30 is changed.
  • the subfield arrangement selection circuit 140 turns on the subfield without performing diffusion processing on many of the gradation values belonging to the gradation group having a high appearance frequency according to the appearance frequency coefficients AC1 to ACN of each gradation group.
  • a subfield arrangement is selected so as to reduce the average luminance difference between gradations expressed by the subfield lighting pattern so that it can be expressed by a pattern. That is, the subfield arrangement is selected so that the number of gradation values that cannot be expressed only by the subfield lighting pattern is reduced in the gradation group having a high appearance frequency.
  • the number of gradation values that can be expressed only by the subfield lighting pattern without performing the diffusion process is increased according to the appearance frequency of the gradation in the image signal without changing the subfield lighting pattern.
  • the weight (luminance ratio) of each subfield is changed. This reduces the ratio of the number of pixels displayed by error diffusion to the total number of pixels while suppressing the occurrence of moving image pseudo contours, thereby suppressing the generation of granular noise and realizing a smooth gradation expression. be able to.
  • FIG. 6 is a diagram showing a first subfield array (array 1 shown in FIG. 5) and output gradation values.
  • FIG. 7 is a diagram showing a second subfield array (array 2 shown in FIG. 5) and output gradation values.
  • FIG. 8 is a diagram showing a third subfield array (array 3 shown in FIG. 5) and output gradation values.
  • FIG. 9 is a diagram showing a fourth subfield array (array 4 shown in FIG. 5) and output gradation values.
  • each column in the leftmost first column indicates a pattern number
  • each column in the rightmost twelfth column indicates an output gradation value.
  • Each column of the first row indicates the weight (luminance ratio) of each subfield in the subfield arrangement
  • the first row, (n + 1) th column corresponds to the weight of the subfield SFn.
  • the other columns (columns 2nd to 11th in the 2nd to 57th rows) indicate subfield lighting patterns, that is, whether or not the display cells are lit in each subfield. When “” is written, it is turned on, and when nothing is written, it is turned off.
  • the weight of the subfield SFn differs depending on the subfield arrangement, and the subfield lighting pattern corresponding to each pattern number is the same regardless of the subfield arrangement.
  • the subfield lighting pattern is set such that the temporal deviation of the light emission center of gravity is small between the subfield lighting patterns corresponding to the preceding and following gradation values. Thereby, generation
  • the minimum weight set in the subfield SFn and the sum of the set weights are the same regardless of the subfield arrangement. That is, the gradation that can be expressed by the subfield lighting pattern is constant regardless of the subfield arrangement. In the examples shown in FIGS. 6 to 9, the minimum value of the weight set in the subfield SFn is “1”, and the total sum of the set weights is 255.
  • the largest subfield to be lit is the highest gradation value in the subfield SF (k + 3) and the largest subfield to be lit. Includes the lowest gradation value and the next smallest gradation value in the subfield SF (k + 4).
  • the first gradation group LV1 includes gradation values “15”, “19”, and “23”
  • the second gradation group LV2 includes gradation values “27”, “35”, and “39”.
  • the third gradation group LV3 includes gradation values “47”, “57”, and “65”
  • the fourth gradation group LV4 includes gradation values “77”, “89”, and “99”.
  • the fifth gradation group LV5 includes gradation values “119”, “133”, and “145”
  • the sixth gradation group LV6 includes gradation values “175”, “199”, and “213”. Including.
  • the number of gradation values that can be expressed only by the subfield lighting pattern in the first to third gradation groups LV1 to LV3 is increased as shown in FIG. Also in the fifth gradation group LV5, the number of gradation values that can be expressed only by the subfield lighting pattern increases, and the occurrence of granular noise can be reduced.
  • the subfield The array selection circuit 140 may select the first subfield array (array 1).
  • the subfield arrangement selection circuit 140 selects the subfield arrangement in accordance with the measurement result of the histogram measurement circuit 130, thereby suppressing the generation of the moving image pseudo contour and performing the subdiffusion without performing error diffusion. It is possible to increase the number of pixels displayed only by the field lighting pattern and suppress the occurrence of granular noise.
  • gradation values that can be expressed only by the subfield lighting pattern in the third gradation group LV3 are shown in FIG. As shown, the gradation values are 47, 57, and 65 only.
  • a total of 16 gradation values of gradation values 48, 49, 50, 51, 52, 53, 54, 55, 56, 58, 59, 60, 61, 62, 63, 64 Is displayed by error diffusion processing.
  • the first subfield array (array 1) is used to display the gradation value. Granular noise will be noticeable in the image.
  • the gradation values that can be expressed only by the subfield lighting pattern in the third gradation group LV3 are gradation values as shown in FIG. 47, 51, 57, 59, 61, 63, 65.
  • the gradation values displayed by the error diffusion process in the third gradation group LV3 are 12 gradations of 48, 49, 50, 52, 53, 54, 55, 56, 58, 60, 62, and 64 in total. Decrease to value. Therefore, when the number of pixels displaying the gradation value to which the third gradation group LV3 belongs in the input image signal is more than 50% of all the pixels, the fourth subfield array (array 4) is used. The occurrence of granular noise can be reduced as compared with the case where the first subfield array (array 1) is used.
  • FIG. 10 is a diagram illustrating a configuration example of the plasma display device according to the second embodiment.
  • the plasma display device according to the second embodiment is different from the plasma display device according to the first embodiment in that it has a motion detection circuit 150, and the others are the same. Therefore, different points will be described below.
  • the motion detection circuit 150 detects the amount of motion for each pixel based on the image signal S2 output from the inverse gamma conversion processing circuit. Then, the motion detection circuit 150 notifies the subfield arrangement selection circuit 140 when the number of pixels whose motion amount is larger (faster) than a predetermined value is detected by a predetermined number or more.
  • the subfield arrangement selection circuit 140 When the subfield arrangement selection circuit 140 receives the notification, the subfield arrangement selection circuit 140 does not change the subfield arrangement and the corresponding nonlinear parameter according to the measurement result (output frequency coefficient) of the histogram measurement circuit 130.
  • the subfield arrangement selection circuit 140 determines the subfield arrangement and the nonlinear parameters corresponding thereto according to the measurement result (output frequency coefficient) of the histogram measurement circuit 130. As appropriate.
  • the first and second embodiments described above are merely examples, and the present invention is not limited thereto.
  • the number of subfield arrays is arbitrary.
  • the weight of each subfield shown in the subfield arrangement is also an example, and may be set as appropriate according to the display image and the gradation range to be expressed.
  • a gradation that is expressed without performing error diffusion processing and using a predetermined lighting pattern in a gradation group having a high appearance frequency according to the appearance frequency of a specific gradation group in the measured first image signal The weights of the plurality of subfields are determined so as to increase the number of subfields. Thereby, it is possible to suppress the generation of granular noise while suppressing the generation of the moving image pseudo contour, and to realize a smooth gradation expression.

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  • Physics & Mathematics (AREA)
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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

Une unité d'affichage à plasma comportant un champ unique se composant d'une pluralité de sous-champs pondérés comprend un circuit de mesure (130) permettant de mesurer une fréquence d'un groupe spécifique de l'échelle des gris dans un premier signal d'image (S2) pour chaque champ, un circuit de traitement (140) permettant de déterminer la pondération d'une pluralité de sous-champs en fonction de la fréquence mesurée, un circuit convertisseur non linéaire (30) qui convertit non linéairement le premier signal d'image (S2) en un second signal d'image (S3) sur la base du résultat traité de façon à représenter le second signal d'image (S3) à l'aide d'une partie réelle et d'une partie d'erreur de telle manière qu'il est possible d'éviter d'utiliser le modèle d'éclairage spécifié, et des circuits convertisseurs de modèle d'éclairage (40, 50) qui exécutent une opération de traitement de répartition d'erreur spatiale ou temporelle de la partie d'erreur dans le second signal d'image (S3) de façon à remplacer le modèle d'éclairage spécifié par un autre. Il n'est réalisé aucune opération de traitement de répartition d'erreur pour un groupe de l'échelle des gris ayant une fréquence élevée, et la pondération de chaque sous-champ est déterminée de telle manière qu'une échelle des gris représentée sans utiliser le modèle d'éclairage spécifié augmente en nombre, ce qui diminue l'apparition d'un pseudo-profil d'un film et d'un bruit granulaire.
PCT/JP2008/050608 2008-01-18 2008-01-18 Unité d'affichage à plasma et son procédé de traitement WO2009090751A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06311392A (ja) * 1993-04-20 1994-11-04 Fujitsu General Ltd 画像補正方法およびその装置
JPH06332398A (ja) * 1993-05-19 1994-12-02 Fujitsu General Ltd 映像信号処理方法およびその装置
JPH11119730A (ja) * 1997-10-20 1999-04-30 Hitachi Ltd 映像表示装置
JP2002229510A (ja) * 2000-12-05 2002-08-16 Lg Electronics Inc プラズマディスプレーパネルの最適の発光パターン生成方法と輪郭ノイズ測定方法及びグレースケール選択方法
JP2004007391A (ja) * 2001-12-27 2004-01-08 Lg Electronics Inc フラットパネル表示装置の駆動方法及び装置
JP2004212809A (ja) * 2003-01-07 2004-07-29 Lg Electronics Inc 表示装置およびその階調表示方法
JP2006276201A (ja) * 2005-03-28 2006-10-12 Fujitsu Hitachi Plasma Display Ltd プラズマディスプレイ装置及びその処理方法
JP2007101923A (ja) * 2005-10-05 2007-04-19 Fujitsu Hitachi Plasma Display Ltd デジタル表示装置及びその表示方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06311392A (ja) * 1993-04-20 1994-11-04 Fujitsu General Ltd 画像補正方法およびその装置
JPH06332398A (ja) * 1993-05-19 1994-12-02 Fujitsu General Ltd 映像信号処理方法およびその装置
JPH11119730A (ja) * 1997-10-20 1999-04-30 Hitachi Ltd 映像表示装置
JP2002229510A (ja) * 2000-12-05 2002-08-16 Lg Electronics Inc プラズマディスプレーパネルの最適の発光パターン生成方法と輪郭ノイズ測定方法及びグレースケール選択方法
JP2004007391A (ja) * 2001-12-27 2004-01-08 Lg Electronics Inc フラットパネル表示装置の駆動方法及び装置
JP2004212809A (ja) * 2003-01-07 2004-07-29 Lg Electronics Inc 表示装置およびその階調表示方法
JP2006276201A (ja) * 2005-03-28 2006-10-12 Fujitsu Hitachi Plasma Display Ltd プラズマディスプレイ装置及びその処理方法
JP2007101923A (ja) * 2005-10-05 2007-04-19 Fujitsu Hitachi Plasma Display Ltd デジタル表示装置及びその表示方法

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