200844949 0610066ITW 20913twf.doc/006 九、發明說明： 【發明所屬之技術領域】 本發明是有關於-種調整電襞顯示器灰階階調性 法’且特別是有關於-種利用擴充晝面之灰階分 調整電漿顯示器灰階階調性的方法。 固木 【先前技術】 人類最早能看到的動態影像為記錄片型態的電 後’陰極射線管(Cathode Ray Tube，簡稱CRT)的發明 功地衍生出商業化的電視機，並成為每個家庭必備 用品。但是CRT所製作成的各類型顯示器都面 二 的問題’並且因為内部電子搶的結構，而使得顯示器= 龐大亚佔空間’所以不利於薄形化、輕量化及大型化。、 由於上述的問題，而使得研究人員著手開發所謂的平 面面板顯不器(Flat panel Display)。其中，電漿顯示哭 (Plasma Display Pand，簡稱j^p)因為視角影蚩： ?利於大型化等的優點，而常運用於數位電視之中旦= 场的潛力極大。 圖1緣示為電漿顯示器之子圖場的亮度比重 =照圖在電裝顯示器中，是利用控制 : (sustain pulse)的方法，來呈現不同的亮产 = :顯示器灰階表現方法而言，通常是將:個圖場(其= 簡ί發光脈波分散到幾個子圖場⑽姻， 脈’母個子圖場各有轩不同個數的維持發光 4 200844949 0610066ITW 20913twf.doc/0〇6 在圖1中，是將一個圖場區分為SFO〜SF8之9個子圖 場，而每一子圖場則包括一固定的定址期間（address period)102及一依維持發光脈波的次數而不同的維持放電 期間（sustain peri〇d)104。維持發光脈波的次數愈多，則維 持放電期間104愈長。假設電漿顯示器以8個位元來表示 灰階，則共有0〜255等256個灰階可表示。 以一個可以顯示8位元灰階分布的電漿顯示器來說， π、 並不是顯示每一個晝面都會用到256個灰階來顯示。在有 些較暗的晝面時，實際上可能僅使用了少部分的灰階數來 表現晝面。此外，誠如上述電漿顯示器的驅動方式，在顯 示較暗晝面時，會用較多的維持發光脈波來表示畫面，以 維持耗電量瓦數的怪定。 假設上述每個子圖場的權重比為 1:2:4:7:12:22:39:71:97。而在顯示較暗的晝面時，假設需要 兩倍的脈波數，因此每個子圖場的權重則變成 2:4:8:14:24:44:78:142:194。由於每個子圖場所對應之權重 ， 相差變大，導致在最小亮度(LSB)的呈現上職暗晝面的 〇灰階減較大，崎成人_察覺產生雜及階調變 化不順暢的感覺。 【發明内容】 因此本發明提供一種調整電漿顯示器灰階階調性的方 法，能夠當電衆顯示器顯示較暗晝面的時候，調整晝面之 灰階分布的階調性。 树_也提供-種雜紐料，可以適用在電聚 200844949 0610066ITW 20913twf.doc/006 顯示器，用來改善晝面的階調性。 本發明所提供的調整電漿顯示器灰階階調性的方法， 包括了接收一晝面，並且偵測此晝面所顯示之灰階分布的 最大顯示灰階值。藉此，使得本發明能夠依據電漿顯示器 所能顯示之灰階分布的最大預設灰階值與最大顯示灰階值 的比例，而將晝面所顯示之灰階分布的範圍，擴充到電漿 顯示器所能顯示之灰階分布的最大範圍。 r 在本發明較佳的實施例中，更包括將電漿顯示器之最 ‘ 大預設灰階值除以晝面的最大顯示灰階值，而獲得—縮放 倍率。另外，將畫面的灰階分布資料乘以此縮放倍率，而 得到晝面最新的灰階分布資料。藉此，本發明就能利用每 一畫面的子圖場組合成晝面所需最新之灰階分布。 另外，本發明更包括將該維持發光脈波的頻率除以縮 放倍率，以避免晝面的失真。 從另一觀點來看，本發明提供一種調整灰階電路，適 用於電漿顯示器，包括灰階統計單元、運算單元和乘法界。 I 其中，灰1¾統计單元可以接收一晝面，並且統計此書面所 顯示之灰階分布的最大顯示灰階值。而運算單元會將電裝 顯示器所能顯示之灰階分布的最大預設灰階值，除以灰階 統計單元所統計出來之最大顯示灰階值，而得到一縮放件 率。藉此’乘法器就可以將晝面資料乘以縮放倍率後再行 輸出。 由於本發明是依據電漿顯示器所能顯示灰階分布的最 大預設灰階值，與一晝面之灰階分布的最大顯示灰階值= 6 200844949 0610066ITW 20913twf.doc/006 間的比例’來擴充晝面之灰階分布的範圍到電漿顯示 能顯示灰階分布的最大範圍。因此，本發财顯示較^ 晝面時’可以顯示出更微細的變化，而調整了灰階階調性。 為讓本發明之上述和其他目的、特徵和優點能更明頻 易懂，下文特舉較佳實施例，並配合所附圖式，作詳細說 明如下。 【實施方式】 以下就將本發明較佳的實施例加以敘述。為使本發明 所屬領域具有通常知識者能夠更明瞭本發明的精神，下文 是=具有8位元灰階分布的電漿顯示器為例敘述，然而並 不是用來限制本發明。 圖2A繪示一種8位元之灰階分布的示意圖。請參照 圖2A，當一電漿顯示器最大可以有8位元的灰階分布時， 代表其可以具有256階的灰階分布。然而，並不是所有的 旦面都需要用到這256階的灰階分布。例如，有些較暗的 晝面’所用到的灰階分布可能只有A1的範圍。 圖繪示依照本發明之一較佳實施例的一種擴充晝 面之灰階分布範圍的示意圖。若是一晝面的灰階分布，僅 使用到復小的範圍時，就有許多灰階分布上的細微變化沒 有辦法表現出來，並且有可能造成階調不順暢的感覺。因 此’本發明就是將晝面所顯示之灰階分布的範圍A1，擴充 到電I顯示器所能顯示之灰階分布的最大範圍，並且保留 晝面原始的亮度，以避免失真。 圖3繪示為依照本發明之一較佳實施例的一種調整電 200844949 0610066ITW 20913twf.doc/006 漿顯示器灰階階調性之方法的步驟流程圖。請參照圖3， 當本發明如步驟S302所述，接收一畫面時，就可以執行 步驟S304,就是偵測此畫面之灰階分布的最大顯示灰階 值。接著，可以如步驟S306所述，依據電漿顯示器所能 顯示之灰階分布的最大預設灰階值與晝面之最大顯示灰階 值之間的比例，而將晝面所顯示之灰階分布的範圍，擴充 到電漿顯示器所能顯示之灰階分布的最大範圍。 假設，電漿顯示器的灰階資料是8位元，代表其灰階 分布可以有256(0-255)階。換句話說，電漿顯示器之最大 預設灰階值就是255。另外，假設所接收之畫面的灰階分 布僅有65(0-64)階，因此其最大顯示灰階值就是64。 當晝面的最大顯示灰階值被偵測出來後，就可以將電 漿顯示器的最大預設灰階值除以最大顯示灰階值，而獲得 一縮放倍率。假設最大預設灰階值為256，而最大顯示灰 階值為64，則256除以64，得到縮放倍率為255/64，也 就是步驟S308所述之内容。 接著，如步驟S310所述，將所接收到之晝面的接分 部資料乘以此縮放倍率(255/64)，以擴充晝面之灰階分布的 範圍。藉此，本發明就可以如步驟S312所述，利用每個 晝面的子圖場來組成晝面所需最新的灰階分布。 當晝面的灰階資料乘以縮放倍率後，同時會使得晝面 的亮度也會上升，而造成了失真。由於在電漿顯示器中， 每一晝面的灰階分布都是由多數個子圖場所決定。而每一 子圖場都具有固定的定址期間和多數個維持放電期間。其 8 200844949 0610066ITW 20913twf.doc/006 中，每一子圖場的維持放電期間是由一或數個維持發光脈 波來控制，而維持發光脈波的頻率也控制了晝面的亮度。 因此，本發明也包括將維持發光脈波的頻率除以上述 的縮放倍率，以使晝面維持原來的亮度不變。在有些選擇 的實施例中，可以藉由查表來獲得適當的維持發光脈波之 頻率。 圖4繪示為依照本發明之一較佳實施例的一種調整灰 階電路之電路方塊圖。請參照圖4，本發明所提供的調整 灰階電路400中，包括了灰階統計單元4〇2、運算單元4〇4 和乘法器406。在本實施例中，調整灰階電路4〇〇耦接至 衫像處理裔412，以對一晝面進行灰階分布的擴充。 §衫像處理為412接收一晝面之後，可以將其送至調 整灰階電路400中的灰階統計單元4〇2。此時，灰階統計 單兀402就會統計所接收之晝面之灰階分布的最大顯示灰 I1白值，並且將統計的結果送至運算單元4〇4。當運算單元 404接收到灰階統計單元4〇2所輸出之統計的結果之後， έ將笔漿顯示杰所能顯示之灰階分布的最大預設灰階值除 以所接收之晝面的最大顯示灰階值，並且獲得一縮放倍 率。此時’乘法器406會將所輸入之晝面的灰階分布資料 乘以縮放倍率，而獲得晝面最新的灰階分布。 另外’當運算單元4〇4獲得縮放倍率後，會依據此縮 放倍率而調整維持發光脈波sp的頻率。在有些實例中， 運异單元404會將維持發光脈波SP的頻率除以縮放倍 率。而在另外一些選擇實施例中，運算單元會依據縮放倍 9 200844949 0610066ITW 20913twf.doc/006 ^，而利用查表的方式獲得維持發光脈波sp最適當的頻 圖5緣示為依照本發明另一實施例的—種調整 路之電路方塊圖。請參照圖5，本實施例所提供的調整灰 =電路500,包括了灰階統計單元5〇2、乘法器5〇6和查表 單元504。而調整灰階電路500與圖4之調整灰階電路 最大的不同，在於計算最大灰階分佈的的動作移至外部來 統計，而在調整灰階電路500則是進行查表的程序。 詳細來說，當影像處理器512接收到晝面後，會將其 送至乘法器506、灰階統計單元5〇2以及一外部的^算模 組514。與圖4之灰階統計單元402相同，灰階統計單元 5〇2會統計所接收之晝面之灰階分布的最大顯示灰階值， 亚且將統計的結果送至查表單元5〇4。另外，外部的運算 模，514會進行與圖4之運算單元4〇4部分的功能，就^ 計算電漿顯示器所能顯示之灰階分布的最大預設灰階值。 而查表單兀504會依據灰階統計值5〇2的統計結果，以及 運异模組514所計算出來的最大預設灰階值進行查表，並 且得到一縮放倍率。此時查表單元5〇4會將此縮放倍率送 至控制單元516，以獲得維持發光脈波sp最適當的頻率。 另外，查表單元504會將此縮放倍率送至乘法器506, 以與原始之畫面進行運算。而乘法器5〇6會將經過運算的 晝面送至輸出單元518，以將最新的晝面輸出。 综上所述，由於本發明將輸入晝面的灰階分部資料， 乘以電漿:顯示器所能顯示之灰階分布的最大預設灰階值除 200844949 0610066ITW 20913twf.doc/006 以晝面之灰階分布的最大顯示灰階值所獲得的縮放倍率。 藉此，本發明能夠擴充晝面之灰階分布的範圍，而顯示出 較為細的灰階變化，並且有較好的灰階階調性。 另外，本發明會依據縮放倍率而調整維持發光脈波的 頻率，以使晝面能維持原始的亮度。因此，本發明也能避 免晝面的失真。 f200844949 0610066ITW 20913twf.doc/006 IX. Description of the invention: [Technical field of the invention] The present invention relates to a method for adjusting the gray scale tone of an electric display, and in particular to the use of an expanded ash The method of adjusting the gray scale tone of the plasma display. Solid wood [Prior Art] The first dynamic image that can be seen by humans is the recording of the type of electric post-Cathode Ray Tube (CRT), which was derived from the commercialization of TV sets and became a family. Essential supplies. However, the various types of displays produced by CRTs have the problem of two faces, and because of the structure of internal electronic grabbing, the display = large sub-occupation space is not conducive to thinning, light weight, and large size. Due to the above problems, researchers have begun to develop the so-called Flat Panel Display. Among them, Plasma Display Pand (referred to as j^p) because of the perspective of the perspective: to facilitate the advantages of large-scale, etc., and often used in digital TVs, the potential of the field is extremely large. Figure 1 shows the brightness of the sub-field of the plasma display. The specific gravity of the sub-field of the plasma display is shown in the electric display. It is controlled by the method of (sustain pulse) to show different bright yields. Usually it will be: a map field (its = simple illuminating pulse wave scattered to several sub-fields (10) marriage, pulse 'mother sub-field each with a different number of sustaining lights 4 200844949 0610066ITW 20913twf.doc/0〇6 In FIG. 1, a field is divided into nine sub-fields of SFO~SF8, and each sub-field includes a fixed address period 102 and a number of times of sustaining the illuminating pulse wave. The sustain discharge period (sustain peri〇d) 104. The more times the illuminating pulse wave is maintained, the longer the sustain discharge period 104. Assuming that the plasma display represents gray scale by 8 bits, there are 256 such as 0 to 255. The gray scale can be expressed. In a plasma display that can display the 8-bit gray scale distribution, π does not display 256 gray scales for each facet. In some darker faces, In fact, you may only use a small number of grayscales. In addition, as in the above-mentioned plasma display driving method, when displaying a darker surface, more of the illuminating pulse wave is used to represent the picture, so as to maintain the wattage of the power consumption. The weight ratio of each subfield is 1:2:4:7:12:22:39:71:97. When displaying a darker surface, it is assumed that twice the number of pulses is required, so each subfield The weight of the weight becomes 2:4:8:14:24:44:78:142:194. Because of the weight corresponding to each subgraph location, the difference becomes larger, resulting in the appearance of the minimum brightness (LSB). 〇 Gray scale reduction is larger, Saki adults _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ When the surface is dark, adjust the tone of the gray scale distribution of the surface. Tree _ also provides - a kind of miscellaneous materials, which can be applied to the 200844949 0610066ITW 20913twf.doc/006 display to improve the tone of the face. The method for adjusting the gray scale tone of a plasma display provided by the present invention includes receiving昼面, and detecting the maximum display grayscale value of the grayscale distribution displayed by the pupil surface, thereby enabling the present invention to be based on the maximum preset grayscale value and maximum display of the grayscale distribution that the plasma display can display The ratio of the gray scale values, and the range of the gray scale distribution displayed by the facets is extended to the maximum range of the gray scale distribution that the plasma display can display. r In a preferred embodiment of the invention, the power is further included. The maximum preset grayscale value of the pulp display is divided by the maximum display grayscale value of the facet to obtain the zoom ratio. In addition, the gray scale distribution data of the screen is multiplied by the zoom magnification to obtain the latest gray scale distribution data. Thereby, the present invention can utilize the sub-picture fields of each picture to be combined into the latest gray scale distribution required for the kneading. Further, the present invention further includes dividing the frequency of maintaining the illumination pulse wave by the magnification ratio to avoid distortion of the pupil plane. From another point of view, the present invention provides an adjustment gray scale circuit suitable for use in a plasma display, including a gray scale statistical unit, an arithmetic unit, and a multiplication boundary. I Among them, the gray 13⁄4 statistical unit can receive a face and count the maximum display grayscale value of the gray scale distribution shown in the paper. The arithmetic unit obtains a scaling factor by dividing the maximum preset grayscale value of the grayscale distribution displayed by the electrical display by the maximum grayscale value counted by the grayscale statistical unit. The 'multiplier' can multiply the face data by the zoom ratio before outputting it. Since the present invention is based on the maximum preset gray scale value of the gray scale distribution of the plasma display, and the ratio of the maximum display gray scale value of a gray scale distribution of a plane = 6 200844949 0610066ITW 20913twf.doc/006 Extend the range of the gray scale distribution of the kneading surface to the maximum range of the gray scale distribution displayed by the plasma display. Therefore, the present wealth display shows a finer change when the face is smaller, and the gray tone tone is adjusted. The above and other objects, features and advantages of the present invention will become more <RTIgt; [Embodiment] Hereinafter, preferred embodiments of the present invention will be described. In order to make the spirit of the present invention clearer in the art to which the present invention pertains, the following is a description of a plasma display having an 8-bit gray scale distribution, but is not intended to limit the present invention. FIG. 2A is a schematic diagram showing an 8-bit gray scale distribution. Referring to FIG. 2A, when a plasma display can have a grayscale distribution of 8 bits at most, it can represent a gray scale distribution of 256 steps. However, not all of the surfaces need to use this 256-order gray scale distribution. For example, the grayscale distribution used by some of the darker faces may be only the range of A1. The figure shows a schematic diagram of a gray scale distribution range of an expanded surface in accordance with a preferred embodiment of the present invention. If it is a gray scale distribution of a facet, when only a small range is used, there are many subtle changes in the gray scale distribution that cannot be expressed, and there is a possibility that the tone is not smooth. Therefore, the present invention expands the range A1 of the gray scale distribution displayed on the facet to the maximum range of the gray scale distribution that the electric I display can display, and preserves the original brightness of the facet to avoid distortion. 3 is a flow chart showing the steps of a method for adjusting the gray scale tone of a plasma display according to a preferred embodiment of the present invention. Referring to FIG. 3, when the present invention receives a picture as described in step S302, step S304 may be performed to detect the maximum display gray level value of the gray scale distribution of the picture. Then, as shown in step S306, according to the ratio between the maximum preset gray scale value of the gray scale distribution displayed by the plasma display and the maximum display gray scale value of the pupil surface, the gray scale displayed on the back surface may be displayed. The extent of the distribution extends to the maximum extent of the grayscale distribution that can be displayed on the plasma display. Assume that the grayscale data of the plasma display is 8-bit, which means that its grayscale distribution can have 256 (0-255) steps. In other words, the maximum preset grayscale value for a plasma display is 255. In addition, assuming that the grayscale distribution of the received picture is only 65 (0-64) steps, its maximum display grayscale value is 64. When the maximum display grayscale value of the facet is detected, the maximum preset grayscale value of the plasma display can be divided by the maximum display grayscale value to obtain a zoom ratio. Assuming that the maximum preset grayscale value is 256 and the maximum display grayscale value is 64, then 256 is divided by 64, and the zoom magnification is 255/64, which is the content described in step S308. Next, as described in step S310, the received partial data of the received face is multiplied by the zoom ratio (255/64) to expand the range of the gray scale distribution of the facet. Thereby, the present invention can use the sub-picture field of each face to form the latest gray scale distribution required for the facet as described in step S312. When the grayscale data of the face is multiplied by the zoom ratio, the brightness of the face will also increase, causing distortion. Since in a plasma display, the gray scale distribution of each face is determined by the majority of the subgraph locations. Each subfield has a fixed addressing period and a majority of sustain discharge periods. In 2008 200844949 0610066ITW 20913twf.doc/006, the sustain discharge period of each subfield is controlled by one or several sustain illumination pulses, and the frequency of maintaining the illumination pulse also controls the brightness of the pupil surface. Accordingly, the present invention also includes dividing the frequency of sustaining the illuminating pulse wave by the above-described zooming magnification so that the kneading surface maintains the original brightness. In some alternative embodiments, the frequency of maintaining the illumination pulse can be obtained by looking up the table. 4 is a block diagram of a circuit for adjusting a gray scale circuit in accordance with a preferred embodiment of the present invention. Referring to FIG. 4, the grayscale circuit 400 provided by the present invention includes a grayscale statistical unit 4〇2, an arithmetic unit 4〇4, and a multiplier 406. In this embodiment, the adjustment gray scale circuit 4 is coupled to the shirt image processing body 412 to perform a gray scale distribution expansion on a side surface. After the shirt image processing 412 receives a facet, it can be sent to the grayscale statistical unit 4〇2 in the adjusted grayscale circuit 400. At this time, the gray scale statistic 402 counts the maximum display gray I1 white value of the gray scale distribution of the received face, and sends the statistical result to the arithmetic unit 4〇4. After the operation unit 404 receives the result of the statistics output by the grayscale statistical unit 4〇2, the maximum preset grayscale value of the grayscale distribution that can be displayed by the penprint display is divided by the maximum of the received pupils. The grayscale value is displayed and a zoom ratio is obtained. At this time, the multiplier 406 multiplies the gray scale distribution data of the input face by the zoom magnification to obtain the latest gray scale distribution of the face. Further, when the arithmetic unit 4〇4 obtains the zoom magnification, the frequency of maintaining the illumination pulse wave sp is adjusted in accordance with the zoom magnification. In some instances, the transport unit 404 divides the frequency of sustaining the illumination pulse SP by the zoom ratio. In other alternative embodiments, the computing unit obtains the most appropriate frequency of the sustaining illumination pulse sp according to the zoom factor 9 200844949 0610066ITW 20913twf.doc/006 ^, and the edge is shown as another according to the present invention. A circuit block diagram of an adjustment path of an embodiment. Referring to FIG. 5, the adjustment gray=circuit 500 provided in this embodiment includes a gray scale statistical unit 5〇2, a multiplier 5〇6, and a lookup table unit 504. The maximum difference between the adjustment gray scale circuit 500 and the adjustment gray scale circuit of FIG. 4 is that the operation of calculating the maximum gray scale distribution is moved to the outside for statistics, and the adjustment gray scale circuit 500 is a program for performing table lookup. In detail, after the image processor 512 receives the page, it sends it to the multiplier 506, the grayscale statistical unit 5〇2, and an external analog group 514. Similar to the grayscale statistical unit 402 of FIG. 4, the grayscale statistical unit 5〇2 will count the maximum display grayscale value of the received grayscale distribution of the facet, and send the statistical result to the lookup unit 5〇4. . In addition, the external arithmetic mode 514 performs the function of the arithmetic unit 4〇4 of Fig. 4, and calculates the maximum preset grayscale value of the gray scale distribution that the plasma display can display. The check form 504 will perform a table lookup according to the statistical result of the gray scale statistical value 5〇2 and the maximum preset gray scale value calculated by the different module 514, and obtain a zoom ratio. At this time, the look-up unit 5〇4 sends this zoom ratio to the control unit 516 to obtain the most appropriate frequency for maintaining the illumination pulse sp. In addition, the lookup unit 504 sends this zoom ratio to the multiplier 506 to operate with the original picture. The multiplier 5〇6 sends the computed face to the output unit 518 to output the latest face. In summary, since the present invention inputs the grayscale segment data of the facet, multiplied by the plasma: the maximum preset grayscale value of the grayscale distribution that the display can display is divided by 200844949 0610066ITW 20913twf.doc/006 The zoom magnification obtained by the maximum gray scale value of the gray scale distribution. Thereby, the present invention can expand the range of the gray scale distribution of the facet, and exhibit a finer gray scale change, and has a better gray scale tone. In addition, the present invention adjusts the frequency of maintaining the illumination pulse wave in accordance with the zoom magnification so that the pupil surface can maintain the original brightness. Therefore, the present invention can also avoid distortion of the face. f
雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何熟習此技藝者，在不脫離本發明之精神 和範圍内，當可作些許之更動與潤飾，因此本發明之保護 範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1繪示為電漿顯示器之子圖場的亮度比重示意圖。 圖2A繪不一種8位元之灰階分布的示意圖。 圖2B繪示依照本發明之一較佳實施例的—種擴充晝 面之灰階分布範圍的示意圖。 固3、'、3示為依照本發明之一較佳實施例的—種調整電 漿顯示器灰階階雛之錢的步驟流程圖。 圖4繪不為依照本發明之一較佳實施例的一 階電路之電路方塊圖。 種調整灰 路之依照本發明另-實施例的-種調整灰階電 【主要元件符號說明】 :定址期間 104 :維持放電期間 11 200844949 0610066ITW 20913twf.doc/006 400、500 :調整灰階電路 402、502 ··灰階統計單元 404 :運算單元 406、506 :乘法器 412、512 :影像處理器 504 :查表單元 514 :運算模組 516 :控制單元 518 :輸出單元 A1 :晝面所顯示之灰階分布的範圍 SF0〜SF8 :子圖場 SP :維持發光脈波 S302、S304、S306、S308、S310、S312 ··調整電漿顯 示器灰階階調性之方法的步驟流程 12While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the luminance specific gravity of a subfield of a plasma display. Figure 2A depicts a schematic diagram of an 8-bit gray scale distribution. 2B is a schematic diagram showing a gray scale distribution range of an extended surface according to a preferred embodiment of the present invention. Solids 3, ', and 3 show a flow chart of the steps for adjusting the money of the gray scale of the plasma display in accordance with a preferred embodiment of the present invention. 4 is a block diagram of a circuit of a first order circuit in accordance with a preferred embodiment of the present invention. The gray-scale electric power is adjusted according to another embodiment of the present invention. [Main component symbol description]: Addressing period 104: sustain discharge period 11 200844949 0610066ITW 20913twf.doc/006 400, 500: Adjusting gray scale circuit 402 502 · Gray scale statistical unit 404: arithmetic unit 406, 506: multiplier 412, 512: image processor 504: lookup unit 514: arithmetic module 516: control unit 518: output unit A1: displayed on the surface Grayscale distribution range SF0~SF8: Subfield SP: Steps for maintaining the illumination pulse waves S302, S304, S306, S308, S310, S312 · Method of adjusting the gray scale tone of the plasma display