1245550 13718twfl.d〇c/006 • 94.8.12 九、發明說明： 【發明所屬之技術領域】 本發明是有關於-種補償電路及方法，且特別是有關 於一種顯示器的動態階調補償電路及方法。 【先前技術】 ^科技昌明帶給人類生活上更加便利。人們生活中處處 需仰賴各種電子產品，例如提款機、個人電腦、行動電話 以及電視機等。人們透過顯示器可以獲得電子產品所提供 的資訊及了解電子產品之狀態。 顯示器依其顯像原理分為多種顯示器，其中平面顯示 panei display，FPD)已逐漸取代傳統陰極射線映像 管(cathode ray tube，CRT)顯示器。Fpd是以其顯示面板形 狀之總稱’其包括液晶顯示器（liquid crystal display， LCD)、電漿顯示器(plasma display panel，PDP)、有機發光 顯示器（organic light emitting display，OLED)以及場發射平 面顯示器（field emission display，FED)等。 一般而言，液晶顯示器是透過施加特定的驅動電壓以 使液晶偏轉特定角度，藉以驅動液晶來顯示影像，而此驅 動電壓是由影像訊號(一般為數位訊號)轉換提供。然而， 前述之影像訊號、驅動電壓大小與液晶偏轉角度甚至於晝 素透光率的關係並非呈線性關係，所以就需要伽碼校正電 路來調整影像訊號所提供的驅動電壓，以使影像訊號所提 供的驅動電壓與液晶偏轉角度或是晝素穿透率 (transmittance)呈線性關係（Unear relati〇nship)。 習知的伽碼校正方法係依據單一伽碼特性曲線 1245550 1 37 1 8twf 1 .doc/006 94.8.12 (+gamn^ eharaete]：istie ’e)而將數位式的影像爐轉換為 Ϊ = ，以驅動液晶分子。也就是說，輸入顯 哭：钱訊號均是以相同的伽碼值來換算為顯示 碼校正方法並未隨著影像訊 或1 而使得觀賞者無法在背景偏黑 知羽Γ:清楚地觀賞到晝面中的各圖像。由此可 最二Γ校正方法並無法針對動態影像訊號各別提供 ^的_’因而無法提供最佳的顯示 【發明内容】 路，本發明的目的就是提供—軸態_補償電 0一^不同的影像訊號而以不同的伽瑪特性曲線來決 疋、員不為的驅動電壓。 可斜目的狀供―種動態階調補償的方法’ ，，子各動態影像而動態補償其階調，以改善影像的品質。 顯示出一種動態階調補償電路，適於補償輸入至 ;1、二動恶景》像訊號。此動態階調補償電路主要包括分 二2、多個伽碼電Μ產生器(gammavGltagegenerator)以 二ϊ1!，’。其中，分析單元係用以分析此動態影 ㈣分佈㈣，並依齡析結果而輪出分析訊 而母一個伽碼電壓產生器係用以依據一伽碼特性曲喰 2生伽碼雜。選擇器則係電性減至分析單元與伽碼 ^塱產生器之間，用以依據此分析訊號而選擇這些伽碼電 屢產生器其中之一，再藉由這些伽碼電磨產生器中之伽碼 特性曲線而產生對應於動態影像訊號的伽碼電壓。 1245550 13718twfl .doc/〇〇6 ' 94.8.12 本，明提出—種動態階調補償的方法，適於補償輸入 至顯不器的動態影像訊，此動態階調補償的方法 動態影像訊號之灰階分佈情形，並依據分析結果而輸二分 析訊號。接著依據此分析訊號來選擇伽碼特性曲線，再依 據所選擇的伽碼特性曲線來輸出對應於此動態影像訊號的 伽碼電壓。 本舍明可應用於動態晝面的顯示過程中，並 影像，號在每一圖框時間(frame㈣中的灰階來改變二 將動悲影像訊號轉換為顯示器之驅動電壓的伽碼值， 提高晝面的顯示品質。 *為讓本發明之上述和#他㈣、特徵和優點能更明顯 易丨董下文特舉較佳貫施例，並配合所附圖式，作詳細說 明如下。 【實施方式】 圖1繪不為本發明一較佳實施例的一種動態階調補償 的方法的流程示意圖。此種動態階翻償的方法適用於補 ^輸入至顯不器（未繪示）的動態影像訊號之灰階，此動 ，影，訊號在不同的圖框時間中係具有不同的灰階分佈。 清爹照圖卜此方法係先對輸入至顯示器的動態影像訊號 的灰階分佈進行分析，並依據分析結果而輸出分析訊號， 如步驟S100所述。在一較佳實施例中，步驟sl〇〇例如是 藉由特定功能積體電路(Application Speciflc Integrated1245550 13718twfl.d〇c / 006 • 94.8.12 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a compensation circuit and method, and more particularly to a dynamic tone compensation circuit of a display and method. [Previous Technology] ^ Technology Changming brings more convenience to human life. People rely on a variety of electronic products in their lives, such as cash machines, personal computers, mobile phones and televisions. Through the display, people can obtain the information provided by the electronic products and understand the status of the electronic products. The display is divided into a variety of displays according to its display principle, of which the flat panel display (FPD) has gradually replaced the traditional cathode ray tube (CRT) display. Fpd is a general term for the shape of its display panel. It includes a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting display (OLED), and a field emission flat display ( field emission display (FED), etc. Generally speaking, a liquid crystal display displays an image by applying a specific driving voltage to deflect the liquid crystal by a specific angle, and the driving voltage is provided by converting an image signal (generally a digital signal). However, the aforementioned relationship between the image signal, the driving voltage, and the liquid crystal deflection angle and even the daylight transmittance is not linear. Therefore, a gamma correction circuit is required to adjust the driving voltage provided by the image signal so that the image signal is The driving voltage provided has a linear relationship with the deflection angle of the liquid crystal or the transmittance (Unear relationship). The conventional gamma correction method is based on a single gamma characteristic curve 1245550 1 37 1 8twf 1 .doc / 006 94.8.12 (+ gamn ^ eharaete): istie 'e) to convert the digital image furnace into Ϊ =, To drive liquid crystal molecules. That is to say, the input is crying: the money signal is converted to the display code with the same gamma value. The correction method does not follow the image signal or 1 so that the viewer cannot see the background darker. Γ: Clearly watch Images in the day. Therefore, the best Γ correction method cannot provide ^ 'for different moving image signals, and therefore cannot provide the best display. [Summary of the Invention] The purpose of the present invention is to provide-axial state_compensation voltage 0-^ different The image signal is determined by different gamma characteristic curves. Can be slanted for "a method of dynamic tone compensation", which dynamically compensates the tone of each moving image to improve the quality of the image. Shows a dynamic tone compensation circuit, which is suitable for compensating the input to; 1. This dynamic tone compensation circuit mainly includes two or more gammavGltagegenerators (2, 1 !, '). Among them, the analysis unit is used to analyze the dynamic shadow distribution, and the analysis signal is rotated according to the age analysis result. The mother and a gamma voltage generator are used to tune the 2 gamma ray based on a gamma characteristic. The selector is electrically reduced to between the analysis unit and the gamma ^ 塱 generator, and is used to select one of these gamma electric generators based on the analysis signal, and then use these gamma electric mill generators The gamma characteristic curve generates a gamma voltage corresponding to a moving image signal. 1245550 13718twfl .doc / 〇〇6 '94.8.12 This, Ming Ming proposed a dynamic tone compensation method, suitable for compensating the dynamic image signal input to the display, this method of dynamic tone compensation Order distribution, and the second analysis signal is output according to the analysis result. Then, according to the analysis signal, a gamma characteristic curve is selected, and according to the selected gamma characteristic curve, a gamma voltage corresponding to the moving image signal is output. Ben Sheming can be used in the dynamic daytime display process, and the gray scale in each frame time (frame㈣) can be used to change the gamma value of the moving video signal into the driving voltage of the display. The display quality of the daytime surface. * In order to make the above-mentioned and other features, advantages, and advantages of the present invention more obvious, the following specific examples are given in conjunction with the accompanying drawings, and described in detail below. [Implementation Mode] FIG. 1 is a schematic flowchart of a dynamic tone compensation method according to a preferred embodiment of the present invention. This method of dynamic tone compensation is applicable to the dynamics of inputting to a display (not shown). The grayscale, motion, shadow, and signal of the image signal have different grayscale distributions in different frame time. Qingdiao according to this method first analyzes the grayscale distribution of the dynamic image signal input to the display. And output an analysis signal according to the analysis result, as described in step S100. In a preferred embodiment, step s100 is performed by, for example, a specific function integrated circuit (Application Speciflc Integrated
Circuit’ASIC)來分析動態影像訊號，以便於獲得動態影像 訊號的灰階分佈。 1245550 ...... τ . 1371 8twf2.d〇c/〇〇6 * 94.10.13 $著，依據步驟S1⑻中所輸出的分析訊號來選擇一 二生曲線，如步驟S1〇2所述。其中，當分析訊號所 ^不出的結果是動態影像訊號在此圖框相㈣灰階大多 ?布調時，則選擇伽碼值較小之伽碼特性曲線。在 一較佳^施例中，例如是選擇伽碼值等於2·〇白勺伽碼特性 曲f。右分析訊號所顯示出的結果是動態影像訊號在此圖 框時間内的灰階大多分佈於高階調時，則選擇伽瑪值較大 =碼特性曲線。在—難實施例中，例如是選擇伽碼值 等，2.4的伽碼特性曲線。此外，在一實施例中，若分析 ^號，示出的結果是動態影像訊號在此圖框_内的灰 Ρ白=夕分佈於南階與低階之間的中間階調時，則選擇伽碼 值等於2.2的伽碼特性曲線。 承上述，之後再依據所選擇之伽碼特性曲線而輸出對 >£於此動悲|^像訊號的伽碼電壓，如步驟si所述。在 較仏貝知例中，步驟S1Q4例如是藉由多個串聯電阻與 運^放大器（〇perational amplifier，〇ρ)所構成的伽碼電壓產 生為來輸出對應於動態影像訊號的伽碼電壓。 值得注意的是，本發明在顯示晝面的每一圖框時間中 都重複步驟S100至步驟S1〇4，以便於因應各動態影像訊 號之灰階分佈的變化來輪出較為適當的伽碼電壓，進而使 觀賞者能觀賞到較佳的影像品質。 本發明之動態階調補償的方法係視影像訊號的灰階分 佈情形來決定將此動態影像訊號轉變為顯示器之驅動電壓 的伽碼值，因此本發明可提高顯示器在動態畫面中的顯示 Ϊ245550 l37l8twfl.d〇c/0〇6 94.8.12 口口貝以下將舉一實施例說明實行本發明之動態階調補償 蓺$黾路，但其並非用以限定本發明。所以，熟習此技 二者應η亥知道，本發明之動態階調補償的方法仍可以其他 形式的電路來實行。 、 币圖2繪示為本發明一較佳實施例的一種動態階調補償 电路的方塊示意圖。請參照圖2，動態階調補償電路200 係配，在顯示器（未緣示）中，以便於將顯示器所接收到 的動恶影像訊號DIS由數位訊號轉換為類比訊號，並使此 類比訊號與液晶偏轉角度或像素的穿透率呈線性關係。動 _調補償電路200主要包括分析單元202、多個伽碼電 壓產生器204以及選擇器、施。其中，分析單元202係用 以分析輸入至顯示器的動態影像訊號DIS之灰階分佈的情 形，並且依據分析結果而輸出分析訊號As至選擇哭。 在-較佳實施例中，分析單元搬例如是特定功能積體電 路，用以分析動態影像訊號在不同圖框時間内的灰階分佈 ^兄。特別岐，分析單$ 2〇2例如是以統計圖來表示動 態影像訊號之灰階分佈情況，並藉此統計圖來判斷此動態 影像訊號所顯示出的晝面是偏向黑色(低階調）、偏向白^ (高階調)還是偏向中間階調。 選擇器2〇6係電性麵接於分析單元2〇2與伽碼電壓產 生杰204之間，且當選擇器2〇6接收到分析單元所輸 出的分析訊號AS之後，選擇器施將依據分析訊號as 而從多個伽碼電壓產生器2〇4中選擇其中之_。在一較佳 實施例中，這些伽碼電壓產生器綱至少包括有伽碼電^ 1245550 1 37 1 8twfl d〇c/〇〇6 94.8.12 ί S Γ'上伽碼電壓產生器204 -2 “及伽碼產生 值等上:伽碼電生器綱-Η列如是具有伽碼 器2〇4 3、2.2的伽碼特性曲線，而伽碼電壓產生 然，在1二！1具有伽碼值等於2·4的伽碼特性曲線。當 括且有i仙广知例中’这些伽瑪電壓產生器204還可以包 ιψ^/、他伽碼特性曲線齡，電驗生11，本發明並未 ===2°4的數量，熟習此技二ί ，、斤而而自仃決疋伽碼電壓產生器2〇4的數量。 =別值传,主忍的是，在上述這些伽碼電磨產生哭綱 I外：依據其所具有之伽碼特性曲線來產生伽碼;壓。 大器所構成，且其大致上係與目前=二 电壓產生器相同，熟習此技蓺者庫 " 處將不再»述。 π者偏知雜雜結構，此 斗^外’在一實施例中’ $擇器2G6與這些伽碼電壓產 生益204之間可以是配置有多個開關元件，用= 選擇器206與這些伽碼電壓產生器2〇4之間的通工 舉例來說’當分析單元2〇2所輸出的分析訊號顯示％ 像訊號所顯現的晝面顏色係偏向黑色時，則選擇器，= 藉由開關it件208導通與伽碼值等於2 G之伽 曰 的伽碼電壓產生器綱」之間的通路，並使伽碼電壓^ 器204J依據其所具有的伽碼特性轉來產生對 = 影像訊號的伽碼電壓。而此伽碼_將由選擇^〇6 = 10 1245550 13 7 1 8twf 1 .doc/〇〇6 • 94.8.12 出端206a輸出至顯示器的源極驅動器（source driver)(未绔 不），以使觀看晝面的觀賞者可在這個偏向黑色的晝面: /月疋的觀Μ到该晝面中的景物。反之，當分析單元2似 輸出的分析訊號顯示影像訊號所顯現的晝面顏色係偏向 色時，則選擇器、2〇6會藉由開關元件2〇8導通與伽碼值等 於2.4之伽碼特性曲線的伽碼電壓產生器2〇4一3之間的、禹 路，亚使伽碼電壓產生器2〇4—3依據其所具有的伽碼特= 曲線來產生對應於動態影像訊號的伽碼電壓，再藉由輸出 端206a將其輸出。此外，當分析單元2〇2所輸出的分析訊 號顯示影像訊號所顯現的晝面顏色適中時，則選擇器2㈨ 亦會藉由開關元件208導通與伽碼值等於2.2之伽碼特性 曲線的伽碼電壓產生器綱—2之間的通路，縣由輸出端 2〇6a將其輸出，以使此影像訊號可顯現出品質較佳的晝 面。 一 本發明係先對輸入至顯示器中的動態影像訊號進行分 析並獲得此景W象汛號之灰階分佈的情形。之後再依據此 为析結果選擇適當的伽碼電壓，以便於驅動顯示器，進而 使顯示器所顯示出的晝面之顏色較為明顯。因此，本發明 可應用於動態晝面的顯示過程中，以依據動態影像訊號在 2—圖框時間中不同的灰階分佈來改變伽碼值，進而提高 晝面的顯示品質。而且，由於本發明之動態階調補償電路 中的伽碼電壓產生器係由多個串聯的電阻與運算放大器所 構成，元件成本不南，因此並不會增加製作上的成本。 雖然本發明已以較佳實施例揭露如上，然其並非用以 124555〇 1 3 7 1 8twf 1 .doc/006 94.8.12 限^本發明，任何熟習此技藝者，在不脫離本發明之精 ^旄圍内，當可作些許之更動與潤飾，因此本發明之保言茲 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示為本發明—較佳實施例的—種動態階 的方法的流程示意圖。 ^貝 ”々，2本發明—較佳實施例的—種動態階調補償 电路的方塊不意圖。 【主要元件符號說明】 供二1入至顯示器的動態影像訊號，並依據分 析結果而輸出分析訊號 =:分析訊號來選擇一伽碼特性曲線 200 :動態階調補償電路 202 :分析單元 204、204」、204—2、204 206:選擇器 204_ji ··伽碼電壓產生器 206a :輸出端 208 :開關元件 AS :分析訊號 DIS :動態影像訊號Circuit’ASIC) to analyze the moving image signal in order to obtain the grayscale distribution of the moving image signal. 1245550 ...... τ. 1371 8twf2.doc / 〇〇6 * 94.10.13 $, according to the analysis signal output in step S1⑻ to select a second life curve, as described in step S102. Among them, when the result of analysis of the signal cannot be obtained, the gray-scale characteristic curve of a smaller gamma value is selected when the gray-scale of the moving image signal is mostly adjusted in this frame. In a preferred embodiment, for example, a gamma characteristic curve f having a gamma value equal to 2.0 is selected. The result of the right analysis signal shows that the grayscale of the dynamic image signal in this frame time is mostly distributed in high-order tones, so choose a larger gamma value = code characteristic curve. In the difficult embodiment, for example, a gamma characteristic curve of 2.4 is selected by selecting a gamma value or the like. In addition, in an embodiment, if the ^ symbol is analyzed, the result shown is that the gray image of the moving image signal in this frame _ white = evening is distributed at the middle tone between the south order and the low order, then select A gamma characteristic curve with a gamma value equal to 2.2. Following the above, the gamma voltage of the image signal is then output according to the selected gamma characteristic curve, as described in step si. In a comparative example, step S1Q4 is to generate a gamma voltage corresponding to a moving image signal by generating a gamma voltage composed of a plurality of series resistors and an operational amplifier (〇ρ). It is worth noting that the present invention repeats steps S100 to S104 during each frame time of displaying the day surface, so as to facilitate the rotation of a more appropriate gamma voltage in response to the change in the grayscale distribution of each dynamic image signal. , So that viewers can enjoy better image quality. The method of dynamic tone compensation of the present invention is to determine the gamma value of the driving voltage of the display based on the gray level distribution of the image signal. Therefore, the present invention can improve the display of the display in the dynamic picture. .doc / 0〇6 94.8.12 The following will describe an example of implementing the dynamic tone compensation method of the present invention, but it is not intended to limit the present invention. Therefore, both of whom are familiar with this technique should know that the method of dynamic tone compensation of the present invention can still be implemented in other forms of circuits. Figure 2 shows a block diagram of a dynamic tone compensation circuit according to a preferred embodiment of the present invention. Please refer to FIG. 2. A dynamic tone compensation circuit 200 is provided in a display (not shown), so as to convert the moving image signal DIS received from the display from a digital signal to an analog signal, and make the analog signal and the analog signal The liquid crystal deflection angle or pixel transmittance is linear. The dynamic tuning compensation circuit 200 mainly includes an analysis unit 202, a plurality of gamma voltage generators 204, a selector, and an application. Among them, the analysis unit 202 is used to analyze the gray-scale distribution of the dynamic image signal DIS input to the display, and output the analysis signal As to the selection cry according to the analysis result. In the preferred embodiment, the analysis unit is, for example, a special function integrated circuit for analyzing the grayscale distribution of the dynamic image signal in different frame time. In particular, the analysis order $ 2002 uses a statistical graph to represent the grayscale distribution of the dynamic image signal, and uses this statistical graph to determine that the daylight surface displayed by this dynamic image signal is skewed to black (low-order tone) , Bias towards white ^ (higher order) or middle order. The selector 206 is electrically connected between the analysis unit 202 and the gamma voltage generator 204, and when the selector 206 receives the analysis signal AS output by the analysis unit, the selector will be based on The signal as is analyzed and _ is selected from a plurality of gamma voltage generators 204. In a preferred embodiment, these gamma voltage generators include at least a gamma voltage ^ 1245550 1 37 1 8twfl doc / 〇〇6 94.8.12 ί S Γ ′ on the gamma voltage generator 204 -2 "And the value of the gamma generation, etc .: If the galvanic generator class-queue has the gamma characteristic curve of the gamma device 204, 2.2, and the gamma voltage is generated, it has a gamma at 1 2! 1 A gamma characteristic curve with a value equal to 2 · 4. When included and there is a well-known example of 'these gamma voltage generators 204 can also include the gamma characteristic curve age, electrical test students 11, the present invention Not === 2 ° 4, familiar with this technique, and decide the number of gamma voltage generators 204. = Other values pass, the main thing is that in these gammas The code electric mill produces Cryptography I: Gamma is generated according to the gamma characteristic curve it has. It is composed of a large device, and it is roughly the same as the current two-voltage generator. " It will no longer be described here. The π person knows the miscellaneous structure. In addition, in one embodiment, there may be a configuration between the $ selector 2G6 and these gamma voltage generating benefits 204. For example, when the analysis signal output by the analysis unit 202 shows%, the daytime color system shown by the signal is displayed by the operation between the = selector 206 and these gamma voltage generators 204. When it is biased toward black, the selector, = the path between the switch 208 and the gamma voltage generator with a gamma value equal to 2 G is turned on by the switch 208, and the gamma voltage ^ device 204J is based on its It has a gamma characteristic which in turn generates a gamma voltage for the video signal. And this gamma_ will be selected by ^ 〇6 = 10 1245550 13 7 1 8twf 1 .doc / 〇〇6 • 94.8.12 The output terminal 206a is output to the source driver of the display (not impossible), so that Viewers viewing the daytime surface can see the daylight-oriented surface: On the contrary, when the analysis signal that the analysis unit 2 appears to output, the daytime surface color displayed by the image signal is biased, the selector, 206 is turned on by the switching element 208, and the gamma value is 2.4. The characteristic curve of the gamma voltage generator 204-4, Yulu, and the sub-acting gamma voltage generator 204-3 generates a signal corresponding to the dynamic image signal according to the gamma = curve. The gamma voltage is output through the output terminal 206a. In addition, when the analysis signal output by the analysis unit 202 displays an appropriate daytime color on the display image signal, the selector 2㈨ will also be turned on by the switching element 208 and a gamma characteristic curve having a gamma characteristic curve equal to 2.2. The path between the code voltage generator Gang-2 is output by the output terminal 206a, so that this image signal can show a better quality daytime surface. First, the present invention first analyzes a dynamic image signal input into a display and obtains a gray scale distribution of the scene. Then, based on this analysis, choose an appropriate gamma voltage for the analysis result, so as to drive the display, so that the color of the daylight surface displayed by the display is more obvious. Therefore, the present invention can be applied to the display process of the dynamic daytime surface to change the gamma value according to the different grayscale distribution of the dynamic image signal in the 2-frame time, thereby improving the display quality of the daytime surface. Moreover, since the gamma voltage generator in the dynamic tone compensation circuit of the present invention is composed of a plurality of resistors and an operational amplifier connected in series, the component cost is not high, so it does not increase the manufacturing cost. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to be used in 124555501 3 7 1 8twf 1 .doc / 006 94.8.12 to limit the present invention. Anyone skilled in the art will not depart from the essence of the present invention. ^ Within the scope, some changes and retouching can be made, so the scope of the guarantee of the present invention shall be determined by the scope of the attached patent application. [Brief description of the drawings] FIG. 1 is a schematic flowchart of a method of a dynamic stage according to a preferred embodiment of the present invention. ^ ”” 2, the present invention—the preferred embodiment of the invention—a block of a dynamic tone compensation circuit is not intended. [Description of main component symbols] Dynamic image signal for input to the display and output analysis based on the analysis result Signal =: Analyze the signal to select a gamma characteristic curve 200: Dynamic tone compensation circuit 202: Analysis units 204, 204 ", 204-2, 204 206: Selector 204_ji · Gamma voltage generator 206a: Output terminal 208 : Switching element AS: Analysis signal DIS: Motion image signal