KR100800527B1 - Plasma Display Device - Google Patents

Plasma Display Device Download PDF

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KR100800527B1
KR100800527B1 KR1020050099776A KR20050099776A KR100800527B1 KR 100800527 B1 KR100800527 B1 KR 100800527B1 KR 1020050099776 A KR1020050099776 A KR 1020050099776A KR 20050099776 A KR20050099776 A KR 20050099776A KR 100800527 B1 KR100800527 B1 KR 100800527B1
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subfield
frame
sustain
plasma display
period
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KR1020050099776A
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Korean (ko)
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KR20070043465A (en
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윤상진
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엘지전자 주식회사
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Priority to KR1020050099776A priority Critical patent/KR100800527B1/en
Priority to US11/537,169 priority patent/US7710361B2/en
Priority to EP06020767A priority patent/EP1777681A3/en
Publication of KR20070043465A publication Critical patent/KR20070043465A/en
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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
    • G09G3/2944—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 varying the frequency of sustain pulses or the number of sustain pulses proportionally in each subfield of the whole 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
    • G09G3/22—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
    • G09G3/294—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
    • G09G3/2948—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 increasing the total sustaining time with respect to other times in the 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
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/065—Waveforms comprising zero voltage phase or pause
    • 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
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/066—Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
    • 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
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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

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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)

Abstract

본 발명은 플라즈마 디스플레이 장치에 관한 것으로서, 특히 단위 프레임은 적어도 하나 이상의 서브필드로 구성되고, 상기 각 서브필드 중 서스테인 구간의 중앙부에 발광중심이 매 프레임마다 동일한 시간축 상에 위치하도록 서브필드를 구성하는 서브필드 매핑부를 포함하여 구성되어, 하나의 프레임을 구성하는 서브필드의 배치를 고정시키고 각 서브필드의 발광 중심 위치를 매 프레임마다 일정하게 유지함으로써 하드웨어를 단순화하고, 의사 윤곽 저감을 위한 동작 예측(Motion Estimation) 및 동작 보상(Motion Compensation)에서 오류발생을 최소화하는 효과가 있다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display apparatus, and in particular, a unit frame includes at least one subfield, and a subfield is configured such that a light emission center is positioned on the same time axis in each frame at the center of the sustain period. The subfield mapping unit includes a subfield mapping unit to fix the arrangement of subfields constituting one frame and to keep the emission center position of each subfield constant every frame, thereby simplifying hardware and predicting motion for pseudo contour reduction. Motion Estimation) and Motion Compensation have the effect of minimizing errors.

의사윤곽, 동작예측, 동작보정, ME, MC Pseudo contour, motion prediction, motion compensation, ME, MC

Description

플라즈마 디스플레이 장치{Plasma Display Device}Plasma Display Device

도 1 은 종래 플라즈마 디스플레이 장치에서 계조표현방법이 도시된 도,1 is a diagram illustrating a gray scale expression method in a conventional plasma display apparatus;

도 2 는 종래 플라즈마 디스플레이 장치에서 화면로드에 따른 소비전력과 휘도의 관계가 도시된 그래프,2 is a graph illustrating a relationship between power consumption and luminance according to screen load in a conventional plasma display apparatus;

도 3 은 종래 플라즈마 디스플레이 장치에서 화면로드에 따른 프레임의 구성이 도시된 도,3 is a diagram illustrating a frame configuration according to a screen load in a conventional plasma display device;

도 4 는 본 발명에 따른 플라즈마 디스플레이 장치의 프레임 구성의 제 1 실시예가 도시된 도,4 is a diagram showing a first embodiment of the frame configuration of the plasma display device according to the present invention;

도 5 는 본 발명에 따른 플라즈마 디스플레이 장치의 프레임 구성의 제 2 실시예가 도시된 도이다.5 is a diagram showing a second embodiment of the frame configuration of the plasma display device according to the present invention.

<도면의 주요 부분에 관한 부호의 설명><Explanation of symbols on main parts of the drawings>

SF1 : 첫 번째 서브필드 SF2: 두 번째 서브필드SF1: first subfield SF2: second subfield

SF3 : 세 번째 서브필드 R : 리셋 구간 SF3: third subfield R: reset section

A : 어드레스 구간 S : 서스테인 구간A: address section S: sustain section

본 발명은 플라즈마 디스플레이 장치에 관한 것으로서, 특히 프레임을 구성하는 각 서브필드의 발광중심이 매 프레임마다 동일한 시간축 상에 위치하도록 하여 의사윤곽(Contour Noise)을 저감시키는 플라즈마 디스플레이 장치에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display apparatus, and more particularly, to a plasma display apparatus which reduces contour noise by having the emission centers of the respective subfields constituting a frame be located on the same time axis every frame.

종래의 플라즈마 디스플레이 장치를 살펴보면 다음과 같다.A conventional plasma display device is as follows.

도 1 은 종래 플라즈마 디스플레이 장치에서 계조표현방법이 도시된 도이고, 도 2 는 종래 플라즈마 디스플레이 장치에서 화면로드에 따른 소비전력과 휘도의 관계가 도시된 그래프이며, 도 3 은 종래 플라즈마 디스플레이 장치에서 화면로드에 따른 프레임의 구성이 도시된 도이다.1 is a diagram illustrating a gray scale expression method in a conventional plasma display apparatus, FIG. 2 is a graph showing a relationship between power consumption and luminance according to screen load in a conventional plasma display apparatus, and FIG. 3 is a screen in a conventional plasma display apparatus. Figure is a configuration of the frame according to the load.

일반적으로 플라즈마 디스플레이 장치는 CRT와는 다른 방식으로 계조를 표현한다. 하나의 프레임을 화면에 표시하기 위해서 여러번의 발광을 중첩적으로 적용시켜 계조를 표현한다.In general, the plasma display device expresses the gray scale in a different manner from that of the CRT. In order to display one frame on the screen, gradation is expressed by applying several light emission in an overlapping manner.

즉 발광횟수에 비례하여 밝은 계조가 표현되도록 구현된다. 따라서, 이런 동작을 위해 한 프레임은 복수의 서브필드로 구성된다.That is, the brightness is expressed in proportion to the number of light emission. Thus, for this operation, one frame consists of a plurality of subfields.

도 1 과 같이 보듯이 일반적으로 256 계조를 표현하기 위해 8개의 서브필드로 구성되며, 각 서브필드는 다시 방전을 균일하게 일으키기 위한 리셋 구간, 방전셀을 선택하기 위한 어드레스 구간 및 방전횟수에 따라 계조를 구현하는 서스테인 구간으로 나뉘어진다. 256 계조로 화상을 표시하고자 하는 경우에 1/60 초에 해당하는 프레임 기간(16.67ms)은 상기 8개의 서브필드들(SF1내지SF8)로 나누어지게 된다.As shown in FIG. 1, in general, eight subfields are formed to express 256 gray levels, and each subfield is grayed out according to a reset period for uniformly generating a discharge, an address period for selecting a discharge cell, and the number of discharges. It is divided into sustain intervals to implement. When the image is to be displayed in 256 gray levels, a frame period (16.67 ms) corresponding to 1/60 second is divided into the eight subfields SF1 to SF8.

각 서브필드의 리셋기간 및 어드레스 기간은 각 서브필드마다 동일한 반면에, 서스테인 기간 및 그 방전횟수는 각 서브필드에서 2n(단,n=0,1,2,3,4,5,6,7)의 비율로 증가된다.The reset period and the address period of each subfield are the same for each subfield, while the sustain period and the number of discharges thereof are 2n in each subfield (where n = 0,1,2,3,4,5,6,7). Is increased by the ratio.

이와 같이, 각 서브필드에서 서스테인 기간이 달라지게 되므로 화상의 계조를 표현할 수 있게 된다.In this way, since the sustain period is changed in each subfield, the gray level of the image can be expressed.

도 2는 종래의 플라즈마 디스플레이 패널에서 화면 로드에 따른 소비 전력 및 화면 휘도의 관계를 나타낸 그래프이다. 먼저, 도 2에 사용된 파라미터들을 설명하면 다음과 같다.2 is a graph illustrating a relationship between power consumption and screen brightness according to screen load in a conventional plasma display panel. First, the parameters used in FIG. 2 will be described.

화면로드는 입력되는 데이터가 패널에 표시될 때, 패널의 전체 셀에 대한 표시되는 셀의 계조레벨의 합을 백분율로 나타낸 것을 말한다.The screen load refers to a percentage of the sum of gray levels of the displayed cells with respect to all cells of the panel when the input data is displayed on the panel.

소비 전력 P는 상기 화면 로드가 증가함에 따라 255계조값을 갖는 화이트를 패널에 표시할 때 사용되는 최대 전력을 말한다.Power consumption P refers to the maximum power used when displaying white with 255 gray levels on the panel as the screen load increases.

화면 휘도 L은 255계조값을 갖는 화이트를 패널에 표시할 때 상기 소비 전력에 따른 화이트의 휘도를 말한다.The screen luminance L refers to the luminance of white according to the power consumption when displaying white having 255 gray levels on the panel.

도 2에 도시된 바와 같이, 화면 로드가 증가함에 따라 소비 전력은 초기에 300W까지 증가한 후 일정하게 유지된다. 즉, PDP에서는 화면 로드가 작거나 큰 경우에 관계없이 사용되는 최대 소비 전력을 일정하게 유지시킨다.As shown in Figure 2, as the screen load increases, the power consumption initially increases to 300W and then remains constant. In other words, the PDP keeps the maximum power consumption constant regardless of whether the screen load is small or large.

이 경우, 사용할 수 있는 최대 소비 전력이 일정하기 때문에 화면 로드가 증가함에 따라 화면 휘도가 감소하는 것을 알 수 있다.In this case, it can be seen that the screen luminance decreases as the screen load increases because the maximum power consumption that can be used is constant.

이와 같이, 상기 일정한 소비 전력을 만족하기 위해 화면 로드에 따른 한 프레임 동안 서스테인 펄스 수는 다음 도 3 과 같다. 도 3은 종래의 플라즈마 디스플레이 패널에서 화면 로드에 따른 프레임의 구성이 도시된 도이다.As such, the number of sustain pulses during one frame according to the screen load is as shown in FIG. 3 to satisfy the constant power consumption. 3 is a block diagram illustrating a frame according to a screen load in a conventional plasma display panel.

도 3에 도시된 바와 같이, 화면 로드가 증가함에 따라 서스테인 구간의 폭(펄스의 수)이 감소함을 알 수 있다. 즉, 상기 일정한 소비전력을 만족하기 위해 화면 로드가 증가함에 따라 서스테인 펄스의 수는 줄어들고, 상기 서스테인 펄스의 수가 줄어들기 때문에 화면 전체의 휘도가 감소하게 되는 것이다.As shown in FIG. 3, it can be seen that as the screen load increases, the width (number of pulses) of the sustain section decreases. That is, the number of sustain pulses decreases as the screen load increases to satisfy the constant power consumption, and the luminance of the entire screen decreases because the number of sustain pulses decreases.

상기와 같이 계조를 표현하는 종래 플라즈마 디스플레이 장치는 화면의 로드에 따라 서스테인 구간의 폭이 달라짐으로 인해 매 프레임마다 발광시점이 로드에 따라 달라지고, 특히 동화상의 경우 서브필드의 조합에 따라 의사 윤곽(Contour Noise)이 발생한다. 이를 방지하기 위해 화면의 움직임을 예측하고, APL(Average Picture Level)을 계산하여 APL 별로 의사 윤곽이 발생하지 않게 서브필드의 위치를 가변시켜서 매핑하여 동작 예측 및 동작 보상을 하는 방법을 사용하고 있다.In the conventional plasma display apparatus expressing the gray scale as described above, the light emission time varies according to the load every frame because the width of the sustain section varies depending on the load of the screen. Contour noise occurs. In order to prevent this, a method of predicting motion of a screen, calculating APL (Average Picture Level), and varying and mapping the positions of subfields so that pseudo contours do not occur for each APL are used to predict motion and compensate for motion.

즉 APL에 따라 서브필드의 위치를 바꿈으로 인해 프레임 별로 서브필드의 위치가 계속 바뀌어 동작 예측(Motion Estimation)및 동작 보정(Motion Compensation)을 하는 경우 매번 서브필드의 위치를 파악하고 검사해야 하므로 하드웨어의 구성이 복잡하고 상기 동작 예측 및 동작 보정시 오류가 발생할 가능성이 높아 의사 윤곽을 효율적으로 저감하기 힘든 문제점이 있다.In other words, because the position of the subfield is continuously changed for each frame due to the change of the position of the subfield according to the APL, the motion estimation and motion compensation must be performed every time. It is difficult to efficiently reduce the pseudo contour because the configuration is complicated and errors are likely to occur in the motion prediction and motion correction.

본 발명은 상기한 종래 기술의 문제점을 해결하기 위하여 안출된 것으로서, 그 목적은 하나의 프레임을 구성하는 서브필드의 배치를 고정시키고 각 서브필드의 발광 중심 위치를 매 프레임마다 일정하게 유지함으로써 하드웨어를 단순화하고, 의사 윤곽 저감을 위한 동작 예측(Motion Estimation) 및 동작 보상(Motion Compensation)에서 오류발생을 최소화하는 플라즈마 디스플레이 장치를 제공하는데 있다. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to fix hardware by fixing the arrangement of subfields constituting one frame and keeping the emission center position of each subfield constant every frame. The present invention provides a plasma display device that simplifies and minimizes errors in motion estimation and motion compensation for pseudo contour reduction.

상기한 과제를 해결하기 위한 본 발명에 의한 플라즈마 디스플레이 장치의 특징에 따르면, 단위 프레임은 적어도 하나 이상의 서브필드로 구성되고, 상기 각 서브필드 중 서스테인 구간의 중앙부에 발광중심이 매 프레임마다 동일한 시간축 상에 위치하도록 서브필드를 구성하는 서브필드 매핑부를 포함하여 구성되는 것을 특징으로 한다. According to a feature of the plasma display device according to the present invention for solving the above problems, the unit frame is composed of at least one subfield, the center of light emission in the center of the sustain period of each of the subfields on the same time axis every frame And a subfield mapping unit for configuring a subfield to be located at.

여기서, 본 발명에 의한 플라즈마 디스플레이 장치는 상기 각 서브필드의 서스테인 구간의 중심을 상기 발광중심으로 할 수 있다.In the plasma display device according to the present invention, the center of the sustain section of each subfield may be the emission center.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 4 는 본 발명에 따른 플라즈마 디스플레이 장치의 프레임 구성의 제 1 실 시예가 도시된 도이고, 도 5 는 본 발명에 따른 플라즈마 디스플레이 장치의 프레임 구성의 제 2 실시예가 도시된 도이다.4 is a diagram showing a first embodiment of the frame configuration of the plasma display device according to the present invention, and FIG. 5 is a diagram showing a second embodiment of the frame configuration of the plasma display device according to the present invention.

본 발명에 의한 플라즈마 디스플레이 장치는 하나의 프레임은 적어도 하나 이상의 서브필드로 구성되고, 상기 각 서브필드의 발광 중심이 매 프레임마다 동일한 시간축 상에 위치하도록 서브필드를 구성하는 서브필드 매핑부를 포함하여 구성된다. In the plasma display device according to the present invention, one frame includes at least one subfield, and includes a subfield mapping unit configured to configure the subfields such that the emission center of each subfield is located on the same time axis every frame. do.

상기 서브필드 매핑부는 상기와 같이 발광 중심을 매 프레임마다 동일한 시간축 상에 위치하도록 함으로써 서브필드의 배치를 변경시키지 않는다.The subfield mapping unit does not change the arrangement of the subfields by placing the emission centers on the same time axis every frame as described above.

하나의 단위 프레임은 적어도 하나 이상의 서브필드로 구성되는데 256 계조를 표현하기 위해 8개 또는 12 개의 서브필드로 구성될 수 있다.One unit frame is composed of at least one subfield, and may be composed of 8 or 12 subfields to express 256 gray levels.

하나의 서브필드는 리셋 구간, 어드레스 구간, 서스테인 구간으로 구성된다. 상기 어드레스 구간동안 방전이 발생할 셀이 선택되고, 서스테인 구간동안에 인가되는 펄스의 수에 따라 빛의 세기가 결정된다.One subfield includes a reset period, an address period, and a sustain period. The cells in which discharge is to be generated during the address period are selected, and the light intensity is determined according to the number of pulses applied during the sustain period.

상기 서브필드의 길이는 해당 프레임의 APL값에 따라 최대 전력을 만족하는 범위내에서 달리지게 된다. 특히, 상기 서브필드의 길이는 서스테인 구간의 크기에 의해 좌우된다.The length of the subfield is changed within a range satisfying the maximum power according to the APL value of the frame. In particular, the length of the subfield depends on the size of the sustain period.

만약 상기 APL 값이 낮은 경우에는 높은 계조를 표현하는 셀의 수가 적다는 것이므로, 하나의 프레임에서 발광셀을 표시하는 경우 전력소모가 크지않기 때문에 상기 발광셀을 표현하는 서브필드의 길이를 길게 한다. 즉, 서스테인 구간의 길이가 APL값이 높은 경우보다 길도록 한다.If the APL value is low, the number of cells representing a high gray scale is small. When the light emitting cells are displayed in one frame, power consumption is not large, so the length of the subfield representing the light emitting cells is increased. That is, the length of the sustain section is longer than the case where the APL value is high.

상기 APL값이 높은 경우에는 많은 셀에서의 방전이 필요하므로 서브필드의 길이를 짧게 구성함으로써 소비전력을 최대전력 범위까지 낮출 수 있다.When the APL value is high, discharge is required in many cells, so that the subfield length can be shortened to reduce the power consumption to the maximum power range.

즉, 이 경우 서브필드의 길이는 서스테인 구간동안 인가되는 펄스의 수를 조절함으로써 변화시킬 수 있다.That is, in this case, the length of the subfield can be changed by adjusting the number of pulses applied during the sustain period.

따라서 어떤 경우든지 리셋 구간이나 어드레스 구간의 크기는 APL값과 상관없이 같다. 그러나 리셋 구간이나 어드레스 구간이 각 서브필드마다 다른 경우에도 본 발명이 적용될 수 있다.Therefore, in either case, the size of the reset section or the address section is the same regardless of the APL value. However, the present invention can be applied even when the reset period or the address period is different for each subfield.

상기와 같이 서브필드의 길이가 APL값에 따라 매 프레임마다 달라지더라도 상기 서브필드 매핑부는 상기 서브필드에서 발광하는 시점을 매 프레임마다 일치시키도록 한다. 여기서, 상기 발광하는 시점은 어드레스 구간이나 리셋 구간에서 빛이 발생하는 경우가 아닌 서스테인 구간에서 빛이 발생하거나 유지되는 경우를 기준으로 한다.As described above, even if the length of the subfield is changed every frame according to the APL value, the subfield mapping unit matches the time of light emission in the subfield every frame. The light emission time point is based on the case where light is generated or maintained in the sustain period, not when the light is generated in the address period or the reset period.

본 발명에 따른 플라즈마 디스플레이 장치의 제 1 실시예를 도 4 를 참조하여 서브필드 매핑부를 설명하면 다음과 같다.A first embodiment of the plasma display device according to the present invention will be described with reference to FIG. 4 as follows.

본 발명에 따른 제 1 실시예는 서스테인 구간동안 인가되는 서스테인 펄스의 주기가 일정한 경우인데, 이 경우 상기 서브필드 매핑부는 발광 중심을 서스테인 구간의 중앙부로 하여 서브필드를 구성한다.According to the first embodiment of the present invention, the period of the sustain pulse applied during the sustain period is constant. In this case, the subfield mapping unit configures the subfield using the emission center as the center of the sustain period.

도 4 는 그 일례로 APL 값이 최고인 경우와 최저인 경우 각 서브필드의 길이가 도시되어 있는데, APL 값이 최고인 경우에는 소비전력의 한계 때문에 서브필드 의 길이가 APL값이 최저인 경우에 비해 각각 더 짧도록 구성된다.4 shows an example of the length of each subfield when the APL value is the highest and the lowest. When the APL value is the highest, the length of each subfield is lower than the case where the APL value is the lowest due to the limitation of power consumption. Configured to be shorter.

이 경우 발광 중심은 APL 값과 무관하게 각 서브필드의 서스테인 구간의 중앙이므로, 상기 서스테인 구간의 중앙을 매 프레임 마다 동일한 시간축에 일치시키도록 구성된다.In this case, since the emission center is the center of the sustain period of each subfield regardless of the APL value, the center of the sustain period is configured to coincide with the same time axis every frame.

즉 첫 번째 프레임의 첫 번째 서브필드의 서스테인 구간의 중앙이 그 프레임에서 발광되는 타이밍과 두 번째 프레임에서 첫 번째 서스테인 구간의 중앙이 발광되는 타이밍을 같도록 하는 것이다.That is, the timing of the center of the sustain period of the first subfield of the first frame to emit light is the same as the timing of the center of the first sustain period of the second frame to emit light.

도 4 와 같이 각 서브필드의 서스테인 중심이 매 프레임마다 동일한 타이밍에 발광되도록 한다.As shown in FIG. 4, the sustain center of each subfield is made to emit light at the same timing every frame.

따라서, 항상 최저 APL 값의 서스테인 구간의 중심이 기준이 되어야 한다.Therefore, the center of the sustain interval of the lowest APL value should always be the reference.

이 경우 이전 프레임과 현재 프레임간에 APL 차이에 의해 서스테인 구간의 길이에 차이가 있으면, 짧은 서스테인 구간의 경우는 최저 APL의 서스테인 구간의 중심에 타이밍을 일치시키기 위해 각 서브필드 사이에 어느 정도 여유분의 더미(dummy) 신호를 인가할 필요가 있다.In this case, if there is a difference in the length of the sustain section due to the difference in APL between the previous frame and the current frame, the short sustain section has a certain amount of margin between each subfield to match the timing at the center of the sustain section of the lowest APL. You need to apply a dummy signal.

상기 더미 신호는 화상의 표현에 영향이 없는 신호이어야 한다.The dummy signal should be a signal that does not affect the representation of the image.

이렇게 함으로써 전력소모를 늘이지 않고도 높은 APL값을 가지는 프레임을 표시할 수 있다.In this way, a frame having a high APL value can be displayed without increasing power consumption.

본 발명에 따른 플라즈마 디스플레이 장치의 제 2 실시예를 도 5 를 참조하여 서브필드 매핑부를 설명하면 다음과 같다.A second embodiment of the plasma display device according to the present invention will be described with reference to FIG. 5 as follows.

상기 제 2 실시예는 서스테인 펄스의 주기가 일정하지 않은 경우에 적용될 수 있다.The second embodiment can be applied when the period of the sustain pulse is not constant.

서스테인 펄스의 주기가 일정하지 않으므로 인해 서스테인 구간의 첫 번째 펄스와 두 번째 펄스간의 간격이 일정하지 않으므로 상기 제 1 실시예처럼 서스테인 구간의 중심부를 발광 중심으로 계산하지 않고 각 펄스의 평균 발광시점을 이용한다.Since the period of the sustain pulse is not constant, the interval between the first pulse and the second pulse of the sustain period is not constant. Therefore, the average emission time point of each pulse is used without calculating the center of the sustain period as the emission center as in the first embodiment. .

상기 발광 중심은 다음 수학식 1 에 의해 계산된다.The emission center is calculated by the following equation.

Figure 112005059831218-pat00001
Figure 112005059831218-pat00001

단, 여기서 N 은 각 서브필드 내 서스테인 펄스의 총 개수이고,Where N is the total number of sustain pulses in each subfield,

SUS_DISi 는 서스테인 구간 시작시부터 i 번째 서스테인 펄스의 발광시점까지의 시간이다.SUS_DIS i is the time from the start of the sustain period until the light emission point of the i-th sustain pulse.

상기 SUS_DISi 는 시간적인 개념으로 보면, 서스테인 구간 시작시부터 i 번째 서스테인 펄스의 발광시점까지의 시간이고, 2차원적인 평면적인 개념으로 보면 해당 펄스까지의 거리 또는 위치로 파악될 수 있다.The SUS_DIS i is the time from the start of the sustain period to the light emission time of the i-th sustain pulse. In the two-dimensional plane concept, the SUS_DIS i may be regarded as the distance or position to the corresponding pulse.

상기 각 펄스의 발광시점은 각 펄스인가시 최저 전위에서 상승타임을 거친후에 각 펄스의 최고 전위에 이른 시점을 말한다.The emission point of each pulse refers to a point in time at which the maximum potential of each pulse is reached after rising time at the lowest potential at the time of applying each pulse.

이러한 각 펄스까지의 시간 또는 거리의 합을 전체 서스테인 펄스의 수로 나 눈 평균값이 발광 중심이 되는 것이다.The sum of the time or distance to each of these pulses divided by the total number of sustain pulses is the light emission center.

서브필드 매핑부는 이러한 각 서브필드에서의 발광 중심을 계산하여 매 프레임마다 일치 시켜 서브필드를 구성/매핑한다. 즉, APL 값과 따라 서브필드의 길이와 무관하게 항상 일정한 타이밍에 매 프레임마다 해당 서브필드의 발광 중심이 위치하도록 한다. The subfield mapping unit calculates the emission centers in each of these subfields and matches / constructs the subfields every frame. That is, regardless of the length of the subfield, the emission center of the corresponding subfield is positioned every frame at a constant timing regardless of the length of the subfield.

상기와 같이 서브필드의 배치를 변경하지 않고 매 프레임마다 서브필드의 발광 중심을 일치시킨후 동작 예측(Motion Estimate) 및 동작 보상(Motion Compensation)을 하여 의사 윤곽의 발생을 저감시킨다.As described above, the emission centers of the subfields are matched every frame without changing the arrangement of the subfields, and motion generation and motion compensation are reduced to reduce the occurrence of pseudo contours.

이상과 같이 본 발명에 의한 플라즈마 디스플레이 장치를 예시된 도면을 참조로 설명하였으나, 본 명세서에 개시된 실시예와 도면에 의해 본 발명은 한정되지 않고, 기술사상이 보호되는 범위 이내에서 응용될 수 있다.As described above, the plasma display device according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited by the embodiments and drawings disclosed herein, and may be applied within a range in which technical thoughts are protected.

상기와 같이 구성되는 본 발명에 따른 플라즈마 디스플레이 장치는 하나의 프레임을 구성하는 서브필드의 배치를 고정시키고 각 서브필드의 발광 중심 위치를 매 프레임마다 일정하게 유지함으로써 하드웨어를 단순화하고, 의사 윤곽 저감을 위한 동작 예측(Motion Estimation) 및 동작 보상(Motion Compensation)에서 오류발생을 최소화하는 효과가 있다.The plasma display device according to the present invention configured as described above simplifies hardware and fixes pseudo contour reduction by fixing the arrangement of subfields constituting one frame and keeping the emission center position of each subfield constant every frame. There is an effect of minimizing the occurrence of errors in motion estimation and motion compensation for motion estimation.

Claims (5)

단위 프레임은 적어도 하나 이상의 서브필드로 구성되고,The unit frame is composed of at least one subfield, 상기 각 서브필드 중 서스테인 구간의 중앙부에 발광중심이 매 프레임마다 동일한 시간축 상에 위치하도록 서브필드를 구성하는 서브필드 매핑부를 포함하여 구성되는 것을 특징으로 하는 플라즈마 디스플레이 장치.And a subfield mapping unit configured to configure a subfield such that a light emitting center is positioned on the same time axis every frame in the center of the sustain period among the subfields. 삭제delete 제 1 항에 있어서,The method of claim 1, 상기 플라즈마 디스플레이 장치는 서스테인 구간에 인가되는 서스테인 펄스의 주기가 일정한 것을 특징으로 하는 플라즈마 디스플레이 장치.The plasma display apparatus is characterized in that the period of the sustain pulse applied to the sustain period is constant. 제 1 항에 있어서,The method of claim 1, 상기 각 서브필드의 발광중심은 다음식에 의해 결정되는 것을 특징으로 하는 플라즈마 디스플레이 장치.And a light emission center of each subfield is determined by the following equation.
Figure 112005059831218-pat00002
Figure 112005059831218-pat00002
 (단, 여기서 N 은 각 서브필드 내 서스테인 펄스의 총 개수이고,Where N is the total number of sustain pulses in each subfield, SUS_DISi 는 서스테인 구간 시작시부터 i 번째 서스테인 펄스의 발광시점까지의 시간이다.) SUS_DIS i is the time from the start of the sustain section to the time of emission of the i-th sustain pulse.) 제 4 항에 있어서,The method of claim 4, wherein 상기 플라즈마 디스플레이 장치는 서스테인 구간에 인가되는 서스테인 펄스의 주기가 일정하지 않은 것을 특징으로 하는 플라즈마 디스플레이 장치.The plasma display apparatus is characterized in that the period of the sustain pulse applied to the sustain period is not constant.
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KR20040074895A (en) * 2003-02-18 2004-08-26 삼성에스디아이 주식회사 A method for displaying pictures on plasma display panel and an apparatus thereof
KR20050032355A (en) * 2003-10-01 2005-04-07 삼성에스디아이 주식회사 A method for displaying pictures on plasma display panel and an apparatus thereof
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KR20050040561A (en) * 2003-10-29 2005-05-03 삼성에스디아이 주식회사 Apparatus and method for driving plasma display panel
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Publication number Priority date Publication date Assignee Title
KR20040074895A (en) * 2003-02-18 2004-08-26 삼성에스디아이 주식회사 A method for displaying pictures on plasma display panel and an apparatus thereof
KR20050032355A (en) * 2003-10-01 2005-04-07 삼성에스디아이 주식회사 A method for displaying pictures on plasma display panel and an apparatus thereof
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