TW201816765A

TW201816765A - Brightness control apparatus for use in display device and related method

Info

Publication number: TW201816765A
Application number: TW105134648A
Authority: TW
Inventors: 謝弘義
Original assignee: 奇景光電股份有限公司
Priority date: 2016-10-27
Filing date: 2016-10-27
Publication date: 2018-05-01

Abstract

A brightness control apparatus for use in a display device is provided. The brightness control apparatus includes a gain value generating circuit, a value adjusting circuit and a gamma mapping circuit. The gain generating circuit determines a gain value according to at least one brightness configuration value of the display device. The value adjusting circuit is coupled to the gain value generating circuit and arranged to adjust an input value to generate an output value according to the gain value. The gamma mapping circuit is coupled to the value adjusting circuit and arranged to performing a gamma mapping operation on the output value according to a specific gamma value, thereby to generate a mapped value. The display device is driven based on the mapped value.

Description

顯示裝置的亮度控制裝置與相關方法Brightness control device of display device and related method

本發明係關於顯示裝置，尤指一種控制螢幕亮度的裝置與相關方法。The present invention relates to display devices, and more particularly to a device and associated method for controlling brightness of a screen.

主動矩陣有機發光二極體（Active-matrix organic light-emitting diode，AMOLED）顯示裝置的螢幕亮度調整機制常藉由以下兩種方式來實現。第一，在面板中的每個單元(cell)中設置電路開關，透過此開關來控制像素電流，改變亮度。然而，由於開關受到製程變異的影響，造成開關之間存在個體差異，所以會有亮度不均勻或不準確的問題。第二，利用數位伽瑪校正(digital gamma correction)電路，對輸入圖像資料進行數值調整，從而達到調整亮度的效果。若使用數位伽瑪校正電路來調整亮度，則數位伽瑪校正電路中需要儲存多組對應於不同亮度調整結果的數值對照表(look up table，LUT)，而這種作法存在以下缺陷。首先，亮度調整的階數會受LUT數量的限制，也就是說，如果要能精確地控制螢幕亮度，並須針對每一階的亮度調整，儲存一組LUT，但這樣會增加數位伽瑪校正電路的儲存負擔。另外，這些對應於不同亮度的LUT也需要針對標準的伽瑪值2.2進行校正，如此一來，增加了伽瑪校正的複雜度，導致數位伽瑪校正電路變得更為龐大。The screen brightness adjustment mechanism of the active-matrix organic light-emitting diode (AMOLED) display device is often implemented in the following two ways. First, a circuit switch is set in each cell in the panel, through which the pixel current is controlled and the brightness is changed. However, since the switch is affected by the variation of the process, there is an individual difference between the switches, so there is a problem that the brightness is uneven or inaccurate. Second, the digital gamma correction circuit is used to adjust the input image data to achieve the effect of adjusting the brightness. If a digital gamma correction circuit is used to adjust the brightness, the digital gamma correction circuit needs to store a plurality of sets of look up tables (LUTs) corresponding to different brightness adjustment results, and this method has the following drawbacks. First, the order of brightness adjustment is limited by the number of LUTs, that is, if you want to accurately control the brightness of the screen, you must store a set of LUTs for each level of brightness adjustment, but this will increase the digital gamma correction. The storage burden of the circuit. In addition, these LUTs corresponding to different brightnesses also need to be corrected for the standard gamma value of 2.2, thus increasing the complexity of the gamma correction, resulting in a larger digital gamma correction circuit.

由此可知，現有用於主動矩陣有機發光二極體顯示裝置的亮度控制機制存在缺陷。It can be seen that the existing brightness control mechanism for the active matrix organic light emitting diode display device has drawbacks.

為了解決習知顯示裝置中亮度控制機制的缺點，本發明之一目的在於提供一種創新的螢幕亮度控制方法。其中，本發明藉由直接調整輸入圖像資料的數值，使驅動電路以調整後的數值來驅動面板，從而達到亮度調整的效果。此作法的特點在於，在進行數位伽瑪校正前進行輸入數值的調整，因此既有的數位伽瑪校正電路不需要進行額外變更，且亦不會如習知技術般，亮度調整的彈性與精確度受限於數位伽瑪校正電路。In order to solve the shortcomings of the brightness control mechanism in the conventional display device, it is an object of the present invention to provide an innovative method for controlling the brightness of a screen. Wherein, the present invention directly adjusts the value of the input image data, so that the driving circuit drives the panel with the adjusted value, thereby achieving the effect of brightness adjustment. This method is characterized in that the input value is adjusted before the digital gamma correction, so that the existing digital gamma correction circuit does not require additional changes, and the brightness and flexibility of the brightness adjustment are not as conventional techniques. The degree is limited by the digital gamma correction circuit.

本發明之一實施例提供一種用於一顯示裝置中的的亮度控制裝置。該亮度控制裝置包含：一增益值產生電路、一數值調整電路以及一伽瑪轉換電路。該增益值產生電路依據該顯示裝置對應之至少一亮度設定值，產生一增益值。該數值調整電路耦接於該增益值產生電路，並用以接收該輸入數值，以依據該增益值調整一輸入數值產生一輸出數值。該伽瑪轉換電路耦接於該數值調整電路，並用以根據一特定伽瑪值，將該輸出數值進行一伽瑪轉換，產生一轉換後數值，其中該顯示裝置基於該轉換後數值而被驅動。An embodiment of the present invention provides a brightness control device for use in a display device. The brightness control device comprises: a gain value generating circuit, a value adjusting circuit and a gamma converting circuit. The gain value generating circuit generates a gain value according to at least one brightness setting value corresponding to the display device. The value adjustment circuit is coupled to the gain value generating circuit and configured to receive the input value to adjust an input value according to the gain value to generate an output value. The gamma conversion circuit is coupled to the value adjustment circuit and configured to perform a gamma conversion on the output value according to a specific gamma value to generate a converted value, wherein the display device is driven based on the converted value .

本發明之另一實施例提供一種用於一顯示裝置中的亮度控制方法。該方法包含：依據該顯示裝置對應之至少一亮度設定值，決定一增益值；依據該增益值調整該輸入數值，產生一輸出數值；基於一特定伽瑪值，對該輸出數值進行一伽瑪轉換，產生一轉換後數值；以及根據該轉換後數值驅動該顯示裝置。Another embodiment of the present invention provides a brightness control method for use in a display device. The method includes: determining a gain value according to at least one brightness setting value corresponding to the display device; adjusting the input value according to the gain value to generate an output value; performing a gamma on the output value based on a specific gamma value Converting, generating a converted value; and driving the display device based on the converted value.

在說明書及後續的申請專利範圍當中使用了某些詞彙來指稱特定的元件。所屬領域中具有通常知識者應可理解，硬體製造商可能會用不同的名詞來稱呼同一個元件。本說明書及後續的申請專利範圍並不以名稱的差異來作為區分元件的方式，而是以元件在功能上的差異來作為區分的準則。在通篇說明書及後續的請求項當中所提及的「包含」係為一開放式的用語，故應解釋成「包含但不限定於」。此外，「耦接」一詞在此係包含任何直接及間接的電氣連接手段。因此，若文中描述一第一裝置耦接於一第二裝置，則代表該第一裝置可直接電氣連接於該第二裝置，或透過其他裝置或連接手段間接地電氣連接至該第二裝置。Certain terms are used throughout the description and following claims to refer to particular elements. Those of ordinary skill in the art should understand that a hardware manufacturer may refer to the same component by a different noun. The scope of this specification and the subsequent patent application do not use the difference of the names as the means for distinguishing the elements, but the difference in function of the elements as the criterion for distinguishing. The term "including" as used throughout the specification and subsequent claims is an open term and should be interpreted as "including but not limited to". In addition, the term "coupled" is used herein to include any direct and indirect electrical connection. Therefore, if a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device or indirectly electrically connected to the second device through other devices or connection means.

請參考第1圖，該圖為本發明亮度控制裝置之一實施例的架構圖。如圖所示，本發明之亮度控制裝置100用於一顯示裝置300中，實現螢幕亮度控制。亮度控制裝置100係針對輸入圖像資料對應的輸入數值DI進行處理，產生一輸出數值DO。輸出數值DO再透過伽瑪轉換，產生轉換後數值Dgamma。驅動電路220根據轉換後數值Dgamma，提供適當的電流，驅動面板230中的一個像素。請注意，本說明書中所提到的輸入數值DI，係指面板230中一個像素所對應的亮度數值(亦即，灰階值)。儘管以下說明只針對單一個輸入數值DI的處理進行說明；然而，本領域之技術人士應可明瞭，為了控制顯示裝置300的整體螢幕亮度，亮度控制裝置100可能會同時對不同像素所對應的多個輸入數值DI進行處理，產生多個輸出數值DO。另外，雖然本發明並未對亮度控制裝置100適用的顯示裝置類型有所限制，但在一較佳實施例中，顯示裝置300可為一主動矩陣有機發光二極體（Active-matrix organic light-emitting diode，AMOLED）顯示裝置。Please refer to FIG. 1 , which is an architectural diagram of an embodiment of a brightness control device of the present invention. As shown, the brightness control device 100 of the present invention is used in a display device 300 to achieve screen brightness control. The brightness control device 100 processes the input value DI corresponding to the input image data to generate an output value DO. The output value DO is then passed through a gamma conversion to produce a converted value Dgamma. The drive circuit 220 supplies an appropriate current based on the converted value Dgamma to drive one pixel in the panel 230. Please note that the input value DI mentioned in this specification refers to the brightness value (ie, gray scale value) corresponding to one pixel in the panel 230. Although the following description is only for the processing of a single input value DI; however, it should be apparent to those skilled in the art that in order to control the overall screen brightness of the display device 300, the brightness control device 100 may simultaneously correspond to different pixels. The input values DI are processed to produce a plurality of output values DO. In addition, although the present invention does not limit the type of display device to which the brightness control device 100 is applied, in a preferred embodiment, the display device 300 can be an active matrix organic light emitting diode (Active-matrix organic light- (Emission diode, AMOLED) display device.

亮度控制裝置100包含有一增益值產生電路110、一數值調整電路120以及一伽瑪轉換電路130。增益值產生電路110用以決定一增益值BL_gain，而數值調整電路120則依據增益值產生電路110所決定的增益值BL_gain來調整輸入數值DI，從而產生一輸出數值DO。最後，輸出數值DO將被送到伽瑪轉換電路130。伽瑪轉換電路130基於一特定的伽瑪值（例如：2.2）對輸出數值DO進行伽瑪轉換，產生轉換後數值Dgamma。增益值產生電路110包含有一參數計算單元112，以及一增益計算單元114。參數計算單元112用以依據顯示裝置300對應的至少一亮度設定值，決定一增益參數，而增益計算單元114則基於參數計算單元112所決定出的增益參數，計算出增益值BL_gain。The brightness control device 100 includes a gain value generating circuit 110, a value adjusting circuit 120, and a gamma converting circuit 130. The gain value generating circuit 110 is configured to determine a gain value BL_gain, and the value adjusting circuit 120 adjusts the input value DI according to the gain value BL_gain determined by the gain value generating circuit 110, thereby generating an output value DO. Finally, the output value DO will be sent to the gamma conversion circuit 130. The gamma conversion circuit 130 performs gamma conversion on the output value DO based on a specific gamma value (for example, 2.2) to generate a converted value Dgamma. The gain value generating circuit 110 includes a parameter calculating unit 112 and a gain calculating unit 114. The parameter calculation unit 112 is configured to determine a gain parameter according to at least one brightness setting value corresponding to the display device 300, and the gain calculation unit 114 calculates the gain value BL_gain based on the gain parameter determined by the parameter calculation unit 112.

在一實施例中，參數計算單元112係依據顯示裝置300對應的一個亮度設定值Bconfig1來決定增益參數。舉例來說，當使用者設定顯示裝置300的亮度設定值為最大亮度的50%後，參數計算單元112可依據此亮度設定值，決定出增益參數BL_duty1為1/2，而增益參數BL_duty1會被進一步作為增益值BL_gain。也就是說，當顯示裝置300只受到一個亮度設定值Bconfig1影響時，則增益參數BL_duty1直接可作為增益值BL_gain。In an embodiment, the parameter calculation unit 112 determines the gain parameter according to a brightness setting value Bconfig1 corresponding to the display device 300. For example, after the user sets the brightness setting value of the display device 300 to 50% of the maximum brightness, the parameter calculation unit 112 can determine that the gain parameter BL_duty1 is 1/2 according to the brightness setting value, and the gain parameter BL_duty1 is Further as the gain value BL_gain. That is to say, when the display device 300 is only affected by one brightness setting value Bconfig1, the gain parameter BL_duty1 can be directly used as the gain value BL_gain.

此外，在部分應用中，顯示裝置300的亮度除了可以透過使用者設定而改變，也可能具備內部的自動調整機制，例如，基於隨環境亮度進行自動的亮度調節。在這種情形下，顯示裝置300會對應兩個亮度設定值Bconfig1與Bconfig2。例如，使用者將顯示裝置300的亮度設定為最大亮度的50%( Bconfig1)，而環境亮度自動調整機制又可將顯示裝置300的亮度調降至最大亮度(經由使用者調整後可達的最大亮度)的25%(Bconfig2)。據此，參數計算單元112基於亮度設定值Bconfig1與Bconfig2，分別決定出第一增益參數BL_duty1為1/2，以及第二增益參數BL_duty2為1/4。接著，增益計算單元114會依據第一增益參數BL_duty1以及第二增益參數BL_duty2決定出增益值BL_gain。較佳地，增益計算單元114為一乘法電路，可將第一增益參數BL_duty1與第二增益參數BL_duty2相乘，從而決定出增益值BL_gain為(1/2)x(1/4)=1/8。In addition, in some applications, the brightness of the display device 300 may be changed by user settings, or may have an internal automatic adjustment mechanism, for example, based on automatic brightness adjustment with ambient brightness. In this case, display device 300 will correspond to two brightness settings Bconfig1 and Bconfig2. For example, the user sets the brightness of the display device 300 to 50% of the maximum brightness (Bconfig1), and the ambient brightness automatic adjustment mechanism can adjust the brightness of the display device 300 to the maximum brightness (the maximum reachable by the user after adjustment). 25% of brightness) (Bconfig2). Accordingly, the parameter calculation unit 112 determines that the first gain parameter BL_duty1 is 1/2 and the second gain parameter BL_duty2 is 1/4 based on the brightness setting values Bconfig1 and Bconfig2, respectively. Next, the gain calculation unit 114 determines the gain value BL_gain according to the first gain parameter BL_duty1 and the second gain parameter BL_duty2. Preferably, the gain calculation unit 114 is a multiplication circuit that multiplies the first gain parameter BL_duty1 and the second gain parameter BL_duty2 to determine that the gain value BL_gain is (1/2) x (1/4)=1/ 8.

歷經上述程序所得到的增益值BL_gain，會被進一步傳送到數值調整電路120。數值調整電路120依據增益值BL_gain，對輸入數值DI進行調整，從而產生輸出數值DO。較佳地，數值調整電路120為一乘法電路，可將增益值BL_gain與輸入數值DI相乘，產生調整後數值DO。The gain value BL_gain obtained by the above procedure is further transmitted to the value adjustment circuit 120. The numerical value adjustment circuit 120 adjusts the input value DI in accordance with the gain value BL_gain to generate an output value DO. Preferably, the value adjustment circuit 120 is a multiplication circuit that multiplies the gain value BL_gain by the input value DI to generate the adjusted value DO.

另外，顯示裝置300的亮度調整，也可透過增益值產生電路110在一定時間間隔內多次調整增益值BL_gain，達到漸進式的亮度變化效果。舉例來說，當顯示裝置300的亮度設定值將要從80%被調整成50%時（基於使用者設置或者是自動調整機制），那麼，增益值產生電路110首先提供數值為0.8的增益值BL_gain（例如：參數計算單元112產生第一增益參數BL_duty1=0.8，以及第二增益參數BL_duty2=1），而在一特定時間間隔後，例如，一個幀周期(frame period)後，產生數值為0.65的增益值BL_gain（例如：參數計算單元112產生第一增益參數BL_duty1=0.65，以及第二增益參數BL_duty2=1）。接著，當再次經過上述的特定時間間隔後，增益值產生電路110將產生數值為0.5的增益值BL_gain（例如：參數計算單元112產生第一增益參數BL_duty1=0.5，以及第二增益參數BL_duty2=1）。如此一來，便可實現顯示裝置300的漸進式螢幕亮度調整。在上述的調整過程中，增益值產生電路110可以依據由外部電路所提供的同步訊號(如V-Sync)，決定切換增益值BL_gain的數值的時機。另外，這個漸進式的亮度調整方式也可用在當顯示裝置300的亮度設定被增加時，也可分成更多階段來實現（例如：0.8→0.7→0.6→0.5）。另外，也可同時對兩個增益參數BL_duty1與BL_duty2進行漸進式的調整。Further, the brightness adjustment of the display device 300 may be performed by the gain value generating circuit 110 adjusting the gain value BL_gain a plurality of times within a certain time interval to achieve a progressive brightness change effect. For example, when the brightness setting value of the display device 300 is to be adjusted from 80% to 50% (based on user setting or automatic adjustment mechanism), the gain value generating circuit 110 first provides a gain value BL_gain having a value of 0.8. (For example, the parameter calculation unit 112 generates the first gain parameter BL_duty1=0.8, and the second gain parameter BL_duty2=1), and after a certain time interval, for example, after one frame period, a value of 0.65 is generated. The gain value BL_gain (for example, the parameter calculation unit 112 generates the first gain parameter BL_duty1 = 0.65, and the second gain parameter BL_duty2 = 1). Then, when the specific time interval described above passes again, the gain value generating circuit 110 generates a gain value BL_gain having a value of 0.5 (for example, the parameter calculating unit 112 generates the first gain parameter BL_duty1 = 0.5, and the second gain parameter BL_duty2 = 1). ). In this way, the progressive screen brightness adjustment of the display device 300 can be achieved. In the above adjustment process, the gain value generating circuit 110 can determine the timing of switching the value of the gain value BL_gain according to the synchronization signal (such as V-Sync) provided by the external circuit. In addition, this progressive brightness adjustment method can also be used when the brightness setting of the display device 300 is increased, or can be divided into more stages (for example, 0.8→0.7→0.6→0.5). In addition, the two gain parameters BL_duty1 and BL_duty2 can be adjusted progressively at the same time.

伽瑪轉換電路130可能儲存有多組對應於不同伽瑪值的LUT，用以基於不同的伽瑪值，對亮度調整後的結果(輸出數值DO)，進行伽瑪校正。在一般情形下，伽瑪轉換電路130只會基於標準的伽瑪值2.2對輸出數值DO進行伽瑪轉換。然而，在部分特殊情形下，伽瑪轉換電路130可能會基於伽瑪值2.2以外的數值，對輸出數值DO進行伽瑪轉換。此外，儘管本發明伽瑪轉換電路130可能儲存有多組LUT，但與習知技術不同之處在於，伽瑪轉換電路130針對一種亮度設定只需要儲存一組LUT，所以兩者在數量上有著相當大的差異。The gamma conversion circuit 130 may store a plurality of sets of LUTs corresponding to different gamma values for performing gamma correction on the brightness-adjusted result (output value DO) based on different gamma values. In the general case, the gamma conversion circuit 130 performs gamma conversion on the output value DO based only on the standard gamma value 2.2. However, in some special cases, the gamma conversion circuit 130 may perform gamma conversion on the output value DO based on a value other than the gamma value of 2.2. In addition, although the gamma conversion circuit 130 of the present invention may store a plurality of sets of LUTs, the difference from the prior art is that the gamma conversion circuit 130 only needs to store one set of LUTs for one brightness setting, so both have a quantity. Quite a big difference.

以上的亮度控制裝置100的運作可歸納為第2圖的流程圖。如圖所示，在步驟21中，依據至少一亮度設定值提供一增益值。接著，在步驟22中，依據該增益值調整該輸入數值，產生一輸出數值。並且，在步驟23中，依據該輸出數值，進行一伽瑪轉換，產生一轉換後數值。最後，在步驟24中，根據該轉換後數值驅動該顯示裝置。由於在先前的段落中，已對亮度控制裝置100的原理與操作細節做了詳細的介紹，為求說明書扼要，在此不對步驟21~24進行重複性的描述。The operation of the above brightness control device 100 can be summarized as the flowchart of FIG. As shown, in step 21, a gain value is provided in accordance with at least one brightness setting. Next, in step 22, the input value is adjusted according to the gain value to generate an output value. And, in step 23, a gamma conversion is performed according to the output value to generate a converted value. Finally, in step 24, the display device is driven based on the converted value. Since the principle and operation details of the brightness control device 100 have been described in detail in the previous paragraphs, steps 21 to 24 are not described repeatedly for the purpose of the description.

總結來說，本發明的亮度調整機制，係直接調整輸入數值，而並非透過伽瑪轉換來改變螢幕亮度，所以可以節省或降低習知架構下，伽瑪校正電路的硬體成本與複雜度。此外，由於亮度調整的階數不再受到LUT的數量所限制，所以在亮度調整與控制上也更為精確以及具有較好的彈性。In summary, the brightness adjustment mechanism of the present invention directly adjusts the input value instead of changing the brightness of the screen through gamma conversion, so that the hardware cost and complexity of the gamma correction circuit under the conventional architecture can be saved or reduced. In addition, since the order of brightness adjustment is no longer limited by the number of LUTs, it is also more accurate in brightness adjustment and control and has better elasticity.

以上文中所提及之「一實施例」代表針對該實施例所描述之特定特徵、結構或者是特性係包含於本發明之至少一實施方式中。因此，文中不同段落中所出現之「一實施例」並非代表相同的實施例。因此，儘管以上對於不同實施例描述時，分別提及了不同的結構特徵或是方法性的動作，但應當注意的是，這些不同特徵可透過適當的修改而同時實現於同一特定實施方式中。以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。The "an embodiment" referred to above means that a particular feature, structure or characteristic described for the embodiment is included in at least one embodiment of the invention. Therefore, "an embodiment" as used in the various paragraphs herein does not represent the same embodiment. Therefore, while the various structural features or methodological acts are described above, respectively, for the various embodiments, it should be noted that these various features can be implemented in the same particular embodiment. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100‧‧‧亮度控制裝置
110‧‧‧增益值產生電路
120‧‧‧數值調整電路
112‧‧‧參數計算單元
114‧‧‧增益計算單元
130‧‧‧伽瑪轉換電路
220‧‧‧驅動電路
230‧‧‧面板
300‧‧‧顯示裝置 100‧‧‧Brightness control device
110‧‧‧gain value generation circuit
120‧‧‧Value adjustment circuit
112‧‧‧Parameter calculation unit
114‧‧‧Gain calculation unit
130‧‧‧Gamma conversion circuit
220‧‧‧ drive circuit
230‧‧‧ panel
300‧‧‧ display device

第1圖為本發明亮度控制裝置之一實施例的架構圖。第2圖為本發明方法之一實施例的流程圖。Figure 1 is a block diagram of an embodiment of a brightness control device of the present invention. Figure 2 is a flow chart of one embodiment of the method of the present invention.

Claims

一種用於一顯示裝置中的一亮度控制裝置，包含：一增益值產生電路，依據該顯示裝置對應之至少一亮度設定值，決定一增益值；一數值調整電路，耦接於該增益值產生電路，用以接收該輸入數值，並依據該增益值調整一輸入數值，產生一輸出數值；以及一伽瑪轉換電路，耦接於該數值調整電路，用以根據一特定伽瑪值，將該輸出數值進行一伽瑪轉換，產生一轉換後數值，其中該顯示裝置依據該轉換後數值被驅動。A brightness control device for use in a display device, comprising: a gain value generating circuit, determining a gain value according to at least one brightness setting value corresponding to the display device; and a value adjusting circuit coupled to the gain value a circuit for receiving the input value, and adjusting an input value according to the gain value to generate an output value; and a gamma conversion circuit coupled to the value adjustment circuit for using the specific gamma value The output value is subjected to a gamma conversion to generate a converted value, wherein the display device is driven according to the converted value.

如請求項1所述之亮度控制裝置，其中該增益值產生電路係依據該亮度設定值以及該亮度設定值對應的一上限值之間的一比例，決定該增益值。The brightness control device according to claim 1, wherein the gain value generating circuit determines the gain value according to a ratio between the brightness setting value and an upper limit value corresponding to the brightness setting value.

如請求項1所述之亮度控制裝置，其中該增益值產生電路於一時間間隔內複數次調整將該增益值，使該增益值由一初始值調整至所決定之數值。The brightness control device of claim 1, wherein the gain value generating circuit adjusts the gain value a plurality of times during a time interval to adjust the gain value from an initial value to the determined value.

如請求項1所述之亮度控制裝置，其中該增益值產生電路包含：一參數計算單元，用以依據一第一亮度設定值與該第一亮度設定值對應的一上限值之間的一第一比例，決定一第一增益參數；以及依據一第二亮度設定值與該第二亮度設定值對應的一上限值之間的一第二比例，決定一第二增益參數；以及一增益計算單元，耦接於該參數計算單元，用以據該第一增益參數以及該第二增益參數計算該增益值。The brightness control device of claim 1, wherein the gain value generating circuit comprises: a parameter calculating unit configured to: according to a first brightness value corresponding to a first brightness setting value and an upper limit value corresponding to the first brightness setting value a first ratio, determining a first gain parameter; and determining a second gain parameter according to a second ratio between a second brightness setting value and an upper limit value corresponding to the second brightness setting value; and a gain The calculation unit is coupled to the parameter calculation unit for calculating the gain value according to the first gain parameter and the second gain parameter.

如請求項1所述之亮度控制裝置，其中該第一亮度設定值係對應於該顯示裝置之一使用者亮度設定，以及該第二亮度設定值對應於該顯示裝置之一自動亮度設定。The brightness control device of claim 1, wherein the first brightness setting corresponds to a user brightness setting of the display device, and the second brightness setting corresponds to one of the display device automatic brightness settings.

如請求項1所述之亮度控制裝置，其中該顯示裝置為一主動矩陣有機發光二極體（Active-matrix organic light-emitting diode，AMOLED）顯示裝置。The brightness control device of claim 1, wherein the display device is an active-matrix organic light-emitting diode (AMOLED) display device.

如請求項1所述之亮度控制裝置，其中該伽瑪轉換電路可基於複數個不同的伽瑪值進行伽瑪轉換，並且該伽瑪轉換電路基於該複數個伽瑪值中之一者，對該輸出數值進行伽瑪轉換。The brightness control device of claim 1, wherein the gamma conversion circuit performs gamma conversion based on a plurality of different gamma values, and the gamma conversion circuit is based on one of the plurality of gamma values, This output value is gamma converted.

一種用於一顯示裝置中進行亮度控制的方法，包含：依據該顯示裝置對應之至少一亮度設定值，決定一增益值；依據該增益值調整該輸入數值，產生一輸出數值；基於一特定伽瑪值，對該輸出數值進行一伽瑪轉換，產生一轉換後數值；以及根據該轉換後數值驅動該顯示裝置。A method for performing brightness control in a display device, comprising: determining a gain value according to at least one brightness setting value corresponding to the display device; adjusting the input value according to the gain value to generate an output value; a value of gamma, a gamma conversion of the output value to produce a converted value; and driving the display device based on the converted value.

如請求項8所述之方法，其中依據該至少一亮度設定值決定該增益值的步驟包含：依據該亮度設定值與該亮度設定值對應的一上限值之間的一比例，決定該增益值。The method of claim 8, wherein the determining the gain value according to the at least one brightness setting value comprises: determining the gain according to a ratio between the brightness setting value and an upper limit value corresponding to the brightness setting value value.

如請求項8所述之方法，其中依據該至少一亮度設定值提供該增益值的步驟包含：於一時間間隔內，複數次調整將該增益值，使該增益值由一初始值調整至所決定之數值。The method of claim 8, wherein the step of providing the gain value according to the at least one brightness setting value comprises: adjusting the gain value by a plurality of times during a time interval, so that the gain value is adjusted from an initial value to a The value of the decision.

如請求項8所述之方法，其中依據該至少一亮度設定值決定該增益值的步驟包含：依據一第一亮度設定值與該第一亮度設定值對應的一上限值之間的一第一比例，決定一第一增益參數；依據一第二亮度設定值與該第二亮度設定值對應的一上限值之間的一第二比例，決定一第二增益參數；以及依據該第一增益參數以及該第二增益參數計算該增益值。The method of claim 8, wherein the determining the gain value according to the at least one brightness setting value comprises: a step between an upper limit value corresponding to the first brightness setting value and the first brightness setting value a first determining a first gain parameter; determining a second gain parameter according to a second ratio between a second brightness setting value and an upper limit value corresponding to the second brightness setting value; and determining the second gain parameter according to the first The gain parameter and the second gain parameter calculate the gain value.

如請求項8所述之方法，其中該第一亮度設定值係對應於該顯示裝置之一使用者亮度設定，以及該第二亮度設定值係對應於該顯示裝置之一自動亮度設定。The method of claim 8, wherein the first brightness setting corresponds to a user brightness setting of the display device, and the second brightness setting corresponds to one of the display device automatic brightness settings.

如請求項8所述之方法，其中該顯示裝置為一主動矩陣有機發光二極體（Active-matrix organic light-emitting diode，AMOLED）顯示裝置。The method of claim 8, wherein the display device is an active-matrix organic light-emitting diode (AMOLED) display device.

如請求項8所述之方法，其中基於該特定伽瑪值對該輸出數值進行一伽瑪轉換的步驟包含：自複數個伽瑪值中選擇一者，並基於所選擇之伽瑪值對該輸出數值進行伽瑪轉換。The method of claim 8, wherein the step of performing a gamma conversion on the output value based on the specific gamma value comprises: selecting one of the plurality of gamma values, and based on the selected gamma value The output value is gamma converted.