TWI415090B - Brightness adjusting apparatus and method for dynamically adjusting brightness of backlight module - Google Patents
Brightness adjusting apparatus and method for dynamically adjusting brightness of backlight module Download PDFInfo
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本發明係關於一種亮度調整裝置以及動態調整背光模組亮度之方法,並且特別地,本發明係關於一種可改善動態背光技術之畫面品質的亮度調整裝置以及動態調整背光模組亮度之方法。 The present invention relates to a brightness adjusting device and a method for dynamically adjusting the brightness of a backlight module, and in particular, the present invention relates to a brightness adjusting device capable of improving the picture quality of a dynamic backlight technology and a method for dynamically adjusting the brightness of the backlight module.
液晶顯示器(Liquid Crystal Display)相較於傳統的陰極射線管(Cathode Ray Tube,CRT)顯示器,其優勢在於體積較小、耗電量較小以及低輻射等。經過各界的致力發展,液晶顯示器已成為市面上所通用的主流顯示器之一。 Compared with the conventional cathode ray tube (CRT) display, the liquid crystal display has the advantages of small volume, low power consumption, low radiation and the like. Through the development of all walks of life, LCD monitors have become one of the mainstream monitors on the market.
液晶顯示器之液晶面板本身並不發光,而是藉由設置於液晶面板背面之背光模組發出之光線穿透液晶面板而讓使用者觀察到發光效果。一般電子產品,如液晶電視、電腦銀幕、手機或筆記型電腦等,所使用之液晶顯示器之最大功率消耗來源為其背光模組,因此,背光模組的省電技術即成為液晶顯示器節省能源的關鍵。 The liquid crystal panel of the liquid crystal display itself does not emit light, but the light emitted by the backlight module disposed on the back surface of the liquid crystal panel penetrates the liquid crystal panel to allow the user to observe the light emitting effect. In general electronic products, such as LCD TVs, computer screens, mobile phones or notebook computers, the maximum power consumption of the liquid crystal display used is its backlight module. Therefore, the power saving technology of the backlight module becomes the energy saving of the liquid crystal display. The essential.
於先前技術中,已有使用耗能較低之發光二極體(Light Emitting Diode,LED)作為背光模組之發光單元並搭配動態背光控制技術(Dynamic Backlight Control,DBC)等降低背光模組耗能之方法。請參閱圖一,圖一係繪示先前技術之動態背光控制系統1的示意圖。如圖一所示,動態背光控制系統1包含動態背光控制單元10以及LED背光 模組12,其中,LED背光模組12耦接動態背光控制單元10並可自動態背光控制單元10接收發光控制訊號100而發光。動態背光控制單元10可接收畫面資訊14,並將畫面資訊14進行資料處理而獲得液晶控制訊號102以及發光控制訊號100,其中液晶控制訊號102可輸出至液晶面板16以控制液晶面板16之液晶偏轉角度,並且發光控制訊號100可輸出至LED背光模組12以控制LED背光模組12之發光。 In the prior art, a light-emitting diode (LED) having a lower energy consumption has been used as a light-emitting unit of a backlight module, and a backlight backlight module (Dynamic Backlight Control, DBC) is used to reduce the consumption of the backlight module. The way to do it. Referring to FIG. 1, FIG. 1 is a schematic diagram showing a prior art dynamic backlight control system 1. As shown in FIG. 1 , the dynamic backlight control system 1 includes a dynamic backlight control unit 10 and an LED backlight. The module 12, wherein the LED backlight module 12 is coupled to the dynamic backlight control unit 10 and can receive the illumination control signal 100 from the dynamic backlight control unit 10 to emit light. The dynamic backlight control unit 10 can receive the screen information 14 and process the screen information 14 to obtain the liquid crystal control signal 102 and the illumination control signal 100. The liquid crystal control signal 102 can be output to the liquid crystal panel 16 to control the liquid crystal deflection of the liquid crystal panel 16. The illumination control signal 100 can be output to the LED backlight module 12 to control the illumination of the LED backlight module 12.
上述發光控制訊號可為類比控制訊號或脈衝寬度調變訊號(數位控制訊號),然而類比控制相較於使用脈衝寬度調變訊號之數位控制而言較為複雜,並且可能造成LED特性不穩定之狀況,因此目前動態背光控制技術通常係以脈衝寬度調變訊號進行。LED背光模組可根據脈衝寬度調變訊號之背光開啟時間比例(duty)決定發光的時間。脈衝寬度調變訊號可與液晶控制訊號同步,以根據不同畫面資料控制背光模組之發光,進而達到動態節省背光模組之能量消耗的目的。 The illumination control signal may be an analog control signal or a pulse width modulation signal (digital control signal). However, the analog control is more complicated than the digital control using the pulse width modulation signal, and may cause unstable LED characteristics. Therefore, the current dynamic backlight control technology is usually performed with a pulse width modulation signal. The LED backlight module can determine the time of illumination according to the duty ratio of the backlight opening time of the pulse width modulation signal. The pulse width modulation signal can be synchronized with the liquid crystal control signal to control the illumination of the backlight module according to different picture data, thereby achieving the purpose of dynamically saving the energy consumption of the backlight module.
舉例而言,請參閱圖二,圖二係繪示圖一之動態背光控制系統1以脈衝寬度調變訊號動態控制背光模組10的特性曲線圖。如圖二所示,上述動態背光控制單元10可分析畫面資料14中之統計值(例如,畫面資料中的最大灰階值)並決定畫面資料14之基準點X,並比對基準點14以及圖二之特性曲線F以決定脈衝寬度調變訊號的背光背光開啟時間比例Y,進而控制背光模組之發光特性。由於動態背光控制單元10可根據不同畫面資料14決定背 光模組之發光特性,因此其為動態的背光控制技術。 For example, referring to FIG. 2, FIG. 2 is a characteristic diagram of the dynamic backlight control system 1 of FIG. 1 dynamically controlling the backlight module 10 by using a pulse width modulation signal. As shown in FIG. 2, the dynamic backlight control unit 10 can analyze the statistical value (for example, the maximum grayscale value in the picture data) in the picture data 14 and determine the reference point X of the picture data 14, and compare the reference point 14 and The characteristic curve F of FIG. 2 controls the backlight backlight opening time ratio Y of the pulse width modulation signal, thereby controlling the illumination characteristics of the backlight module. Since the dynamic backlight control unit 10 can determine the back according to different picture materials 14 The light-emitting characteristics of the light module, so it is a dynamic backlight control technology.
由於上述先前技術係依照畫面資料之統計值(例如,最大灰階值)做為基準點以動態調整背光模組發光,因此當畫面具有劇烈變化時(例如爆炸畫面)將會造成背光源連續性的大幅度變化而造成閃爍現象。於先前技術中,降低背光變化靈敏度之方法可用以改善背光閃爍現象,然而,此方法將會造成背光源之變化跟不上畫面變化,致使部分畫面搭配性錯誤之狀況發生(例如,原本需要較高亮度的畫面配合較低亮度的背光源)。此外,使用上述改善方法也會增加演算法的複雜度。 Since the above prior art uses the statistical value of the picture data (for example, the maximum gray level value) as a reference point to dynamically adjust the backlight module to emit light, when the picture has a drastic change (such as an explosion picture), backlight continuity will be caused. A large change in the cause of flicker. In the prior art, the method of reducing the sensitivity of the backlight change can be used to improve the backlight flicker phenomenon. However, this method will cause the change of the backlight to keep up with the change of the picture, resulting in a situation in which some pictures are mismatched (for example, originally required to be compared). High-brightness picture with low-brightness backlight). In addition, using the above improvements will also increase the complexity of the algorithm.
因此,本發明之一範疇在於提供一種可動態調整背光模組之亮度的亮度調整裝置,以解決上述問題。 Therefore, one aspect of the present invention is to provide a brightness adjusting device capable of dynamically adjusting the brightness of a backlight module to solve the above problems.
根據一具體實施例,本發明之亮度調整裝置包含儲存單元、接收/處理單元以及輸出單元,其中,接收/處理單元連接儲存單元,並且輸出單元連接接收/處理單元。儲存單元內儲存一對照表。接收/處理單元可接收畫面資料並根據畫面資料中之參考值比對儲存單元中之對照表,藉以獲得對應參考值之背光開啟時間比例。輸出單元則可根據此背光開啟時間比例產生脈衝寬度調變訊號。 According to a specific embodiment, the brightness adjusting device of the present invention comprises a storage unit, a receiving/processing unit and an output unit, wherein the receiving/processing unit is connected to the storage unit, and the output unit is connected to the receiving/processing unit. A comparison table is stored in the storage unit. The receiving/processing unit can receive the picture data and compare the reference table in the storage unit according to the reference value in the picture data to obtain a backlight opening time ratio corresponding to the reference value. The output unit can generate a pulse width modulation signal according to the ratio of the backlight on time.
於本具體實施例中,儲存單元所儲存之對照表可對應一調變曲線,此調變曲線係代表背光開啟時間比例與參考值間之對應關係。調變曲線係一迦瑪曲線,並且其上具有 一停損點,停損點兩側之斜率不連續。當畫面資料的參考值小於停損點所對應之參考值時,畫面資料之參考值於調變曲線上所對應之時間背光開啟時間比例大體上維持於一範圍內。因此,接收/處理單元所獲得之背光開啟時間比例不至於因變化過大而導致畫面閃爍。 In this embodiment, the comparison table stored by the storage unit may correspond to a modulation curve, and the modulation curve represents a correspondence between the ratio of the backlight opening time and the reference value. The modulation curve is a gamma curve and has At a stop loss point, the slopes on either side of the stop loss point are not continuous. When the reference value of the picture data is smaller than the reference value corresponding to the stop loss point, the ratio of the reference value of the picture data to the time backlight on time on the modulation curve is substantially maintained within a range. Therefore, the ratio of the backlight on time obtained by the receiving/processing unit does not cause the picture to flicker due to excessive changes.
本發明之一範疇在於提供一種可動態調整背光模組亮度之方法。 One aspect of the present invention is to provide a method for dynamically adjusting the brightness of a backlight module.
根據一具體實施例,本發明之動態調整背光模組亮度之方法可包含下列步驟:首先,根據參考值以及對照表產生具有一背光開啟時間比例之脈衝寬度調變訊號;接著,根據脈衝寬度調變訊號控制背光模組之亮度。其中,參考值係一畫面資料中之數值運算值。 According to a specific embodiment, the method for dynamically adjusting the brightness of the backlight module of the present invention may include the following steps: first, generating a pulse width modulation signal having a backlight on-time ratio according to a reference value and a comparison table; and then, according to a pulse width modulation The variable signal controls the brightness of the backlight module. The reference value is a numerical operation value in a picture data.
於本具體實施例中,對照表可對應一調變曲線,此調變曲線係代表背光開啟時間比例與參考值間之對應關係。調變曲線係一迦瑪曲線,並且其上具有一停損點,停損點兩側之斜率不連續。當畫面資料的參考值小於停損點所對應之參考值時,畫面資料之參考值於調變曲線上所對應之時間背光開啟時間比例大體上維持於一範圍內。因此,本具體實施例之方法所產生之脈衝寬度調變訊號的背光開啟時間比例不至於因變化過大而導致畫面閃爍。 In this embodiment, the comparison table may correspond to a modulation curve, which represents a correspondence between the ratio of the backlight on time and the reference value. The modulation curve is a gamma curve with a stop point on it, and the slopes on both sides of the stop point are not continuous. When the reference value of the picture data is smaller than the reference value corresponding to the stop loss point, the ratio of the reference value of the picture data to the time backlight on time on the modulation curve is substantially maintained within a range. Therefore, the backlight turn-on time ratio of the pulse width modulation signal generated by the method of the embodiment does not cause the picture to flicker due to excessive change.
關於本發明之優點與精神可以藉由以下的發明詳述及所附圖式得到進一步的瞭解。 The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.
請參閱圖三,圖三係繪示根據本發明之一具體實施例之亮度調整裝置2的示意圖。亮度調整裝置2可用以動態調整背光模組之亮度,並改善動態調整時所產生的閃爍現象。如圖三所示,亮度調整裝置2包含儲存單元20、接收/處理單元22以及輸出單元24。接收/處理單元22連接儲存單元20,並且輸出單元24連接接收/處理單元22。此外,儲存單元20中儲存有對照表200。 Referring to FIG. 3, FIG. 3 is a schematic diagram of a brightness adjusting device 2 according to an embodiment of the present invention. The brightness adjusting device 2 can be used to dynamically adjust the brightness of the backlight module and improve the flicker phenomenon generated during dynamic adjustment. As shown in FIG. 3, the brightness adjusting device 2 includes a storage unit 20, a receiving/processing unit 22, and an output unit 24. The receiving/processing unit 22 is connected to the storage unit 20, and the output unit 24 is connected to the receiving/processing unit 22. Further, a lookup table 200 is stored in the storage unit 20.
於本具體實施例中,接收/處理單元22可接收畫面資料A,並且對畫面資料A進行處理而獲得畫面資料A中之一數值運算值以作為參考值。舉例而言,接收/處理單元可分析畫面資料以獲得畫面資料中各像素(pixel)所需之灰階值,並且統計這些灰階值以找出其中之最大灰階值作為其參考值。請注意,於實務中參考值並不限定於最大灰階值,端看使用者或設計者需求而定。接收/處理裝置22可將參考值比對對照表200而獲得對應此參考值之背光開啟時間比例,並且輸出單元24根據此背光開啟時間比例產生脈衝寬度調變訊號M。於實務中,脈衝寬度調變訊號M可進一步連接到背光模組之LED驅動器以驅動LED發光,另一方面,本具體實施例之亮度調整裝置2也可直接建立於LED驅動器中。 In the present embodiment, the receiving/processing unit 22 can receive the picture material A and process the picture material A to obtain a numerical operation value in the picture material A as a reference value. For example, the receiving/processing unit can analyze the picture data to obtain the grayscale values required for each pixel in the picture data, and count the gray level values to find the largest gray level value as its reference value. Please note that the reference value in practice is not limited to the maximum grayscale value, depending on the user or designer's needs. The receiving/processing device 22 can compare the reference value to the look-up table 200 to obtain a backlight turn-on time ratio corresponding to the reference value, and the output unit 24 generates the pulse width modulation signal M according to the backlight turn-on time ratio. In practice, the pulse width modulation signal M can be further connected to the LED driver of the backlight module to drive the LED illumination. On the other hand, the brightness adjustment device 2 of the specific embodiment can also be directly established in the LED driver.
請參閱圖四A以及圖四B,圖四A係繪示根據本發明之另一具體實施例之亮度調整裝置2連接LED驅動器3的示意圖,圖四B係繪示根據本發明之另一具體實施例之亮度調整裝置4的示意圖。如圖四A所示,亮度調整裝置2係一特殊應用積體電路(Application-Specific Integrated Circuit,ASIC),其輸出單元24連接LED驅動器3。LED驅動器3於實務中可為背光模組之一部份,當LED驅動3接收到輸出單元24所產生之脈衝寬度調變訊號M後可根據脈衝寬度調變訊號M控制背光模組中之LED發光。 Please refer to FIG. 4A and FIG. 4B. FIG. 4A is a schematic diagram showing the brightness adjustment device 2 connected to the LED driver 3 according to another embodiment of the present invention, and FIG. 4B is a diagram showing another specific embodiment according to the present invention. A schematic diagram of the brightness adjustment device 4 of the embodiment. As shown in FIG. 4A, the brightness adjusting device 2 is a special application integrated circuit (Application-Specific Integrated Circuit (ASIC), whose output unit 24 is connected to the LED driver 3. The LED driver 3 can be a part of the backlight module in practice. When the LED driver 3 receives the pulse width modulation signal M generated by the output unit 24, the LED in the backlight module can be controlled according to the pulse width modulation signal M. Glowing.
如圖四B所示,於本具體實施例中亮度調整裝置4本身即為LED驅動器或LED驅動器之一部份。亮度調整裝置4同樣包含儲存單元40、接收/處理單元42以及輸出單元44,並且各單元之功能與上述具體實施例相對應之單元之功能大體上相同,故於此不再贅述。本具體實施例與上述具體實施例不同處,在於本具體實施例之輸出單元44所產生之脈衝寬度調變訊號M回授至亮度調整裝置4本身,並且亮度調整裝置4根據調變訊號M控制背光模組中之LED(未繪示於圖中)發光。 As shown in FIG. 4B, in the present embodiment, the brightness adjusting device 4 itself is a part of an LED driver or an LED driver. The brightness adjusting device 4 also includes a storage unit 40, a receiving/processing unit 42 and an output unit 44, and the functions of the units are substantially the same as those of the unit corresponding to the above specific embodiment, and thus will not be described again. The difference between the specific embodiment and the above embodiment is that the pulse width modulation signal M generated by the output unit 44 of the specific embodiment is fed back to the brightness adjusting device 4 itself, and the brightness adjusting device 4 controls according to the modulation signal M. The LEDs (not shown in the figure) in the backlight module emit light.
上述具體實施例中,接收/處理單元可自系統端接收畫面資訊。舉例而言,於桌上型電腦或筆記型電腦中,主機為了使液晶銀幕顯示某些畫面而傳送對應這些畫面之畫面資訊至亮度調整裝置之接收/處理單元。此外,上述具體實施例之儲存單元中所儲存之對照表可對應到一調變曲線,接收/處理單元可根據對照表或調變曲線找出對應參考值之背光開啟時間比例。 In the above specific embodiment, the receiving/processing unit can receive picture information from the system side. For example, in a desktop computer or a notebook computer, the host transmits screen information corresponding to the screens to the receiving/processing unit of the brightness adjusting device in order to display certain screens on the liquid crystal screen. In addition, the comparison table stored in the storage unit of the above specific embodiment may correspond to a modulation curve, and the receiving/processing unit may find the backlight opening time ratio of the corresponding reference value according to the comparison table or the modulation curve.
請參閱圖五,圖五係繪示圖一之對照表200所對應之調變曲線C1的示意圖。如圖五所示,調變曲線C1係代表背光開啟時間比例D(Y軸)以及參考值R(X軸)的對應 關係。於本具體實施例中,參考值R可為畫面資料中之最大灰階值,但本發明並不以此為限。於實務中,參考值R可為能表示出畫面亮度之一數值運算值即可。 Please refer to FIG. 5 , which is a schematic diagram of the modulation curve C1 corresponding to the comparison table 200 of FIG. 1 . As shown in FIG. 5, the modulation curve C1 represents the correspondence between the backlight opening time ratio D (Y axis) and the reference value R (X axis). relationship. In this embodiment, the reference value R may be the maximum grayscale value in the picture data, but the invention is not limited thereto. In practice, the reference value R may be a numerical value that can represent one of the brightness of the screen.
於本具體實施例中,調變曲線C1可為經過迦瑪(gamma)校正之迦瑪曲線。一般而言,使用者觀看最為舒適之迦瑪值係2.2,因此本具體實施例之調變曲線C1係迦瑪值2.2之迦瑪曲線,然而,本發明並不以此為限。調變曲線C1之上具有停損點P1,並且,在停損點P1兩側之調變曲線C1之斜率不連續。 In this embodiment, the modulation curve C1 may be a gamma corrected gamma curve. In general, the user views the most comfortable gamma value 2.2, so the modulation curve C1 of the present embodiment is a gamma curve of the gamma value of 2.2, however, the invention is not limited thereto. There is a stop loss point P1 above the modulation curve C1, and the slope of the modulation curve C1 on both sides of the stop loss point P1 is discontinuous.
如圖五所示,停損點P1對應參考值R1以及背光開啟時間比例D1。調變曲線C1於停損點P1左側之斜率變小,並且當參考值接近0時,其相對應之背光開啟時間比例仍維持於背光開啟時間比例D1之一範圍內而非接近0。藉此,接收/處理單元根據畫面資訊中之參考值比對對照表所獲得之背光開啟時間比例不至於變化過大,故可進一步避免背光模組所發出之光源頻繁地變動而造成閃爍現象。 As shown in FIG. 5, the stop loss point P1 corresponds to the reference value R1 and the backlight open time ratio D1. The slope of the modulation curve C1 on the left side of the stop loss point P1 becomes small, and when the reference value approaches 0, the corresponding backlight on-time ratio remains within one of the backlight on-time ratios D1 rather than close to zero. Therefore, the ratio of the backlight turn-on time obtained by the receiving/processing unit according to the reference value in the screen information is not excessively changed, so that the light source emitted by the backlight module can be further prevented from frequently changing to cause flicker.
上述調變曲線C1係限制最小的背光開啟時間比例,使背光開啟時間比例變化不至於過大。於實務中,調變曲線C1亦可限制最大的背光開啟時間比例。舉例而言,於停損點P1左側之調變曲線C1可具有較大的斜率,並且於停損點P1右側之調變曲線C1可具有較小之斜率。藉此,當畫面資料之參考值大於參考值R1時,接收/處理單元22比對對照表200所獲得之背光開啟時間比例仍維持 於背光開啟時間比例D1之一範圍內。請注意,於實務中,停損點P1的設定位置係根據使用者或設計者需求而定,並不受限於本說明書所列舉之具體實施例。 The above modulation curve C1 limits the minimum backlight turn-on time ratio, so that the backlight turn-on time ratio does not change too much. In practice, the modulation curve C1 can also limit the maximum backlight turn-on time ratio. For example, the modulation curve C1 on the left side of the stop loss point P1 may have a larger slope, and the modulation curve C1 on the right side of the stop loss point P1 may have a smaller slope. Thereby, when the reference value of the picture data is greater than the reference value R1, the ratio of the backlight on time obtained by the receiving/processing unit 22 in comparison with the comparison table 200 is maintained. Within the range of the backlight opening time ratio D1. Please note that in practice, the set position of the stop loss point P1 is determined according to the needs of the user or the designer, and is not limited to the specific embodiments listed in the present specification.
請一併參閱圖三以及圖六,圖六係繪示根據本發明之一具體實施例之動態調整背光模組之亮度之方法的步驟流程圖。如圖六所示,本發明之動態調整背光模組之亮度之方法包含下列步驟:於步驟S50中,根據一參考值以及一對照表獲得對應於此參考值之背光開啟時間比例,並根據所獲得之背光開啟時間比例產生脈衝寬度調變訊號;於步驟S52中,根據脈衝寬度調變訊號控制背光模組之亮度。 Referring to FIG. 3 and FIG. 6 together, FIG. 6 is a flow chart showing the steps of a method for dynamically adjusting the brightness of a backlight module according to an embodiment of the present invention. As shown in FIG. 6, the method for dynamically adjusting the brightness of the backlight module of the present invention includes the following steps: in step S50, obtaining a backlight on-time ratio corresponding to the reference value according to a reference value and a comparison table, and according to The obtained backlight opening time ratio generates a pulse width modulation signal; in step S52, the brightness of the backlight module is controlled according to the pulse width modulation signal.
關於步驟S50,可以圖三之亮度調整裝置2為例加以詳述。接收/處理單元22可接收畫面資訊A,並自畫面資訊A中獲得參考值,接著,接收/處理單元22將參考值比對儲存於儲存單元20中之對照表200而獲得對應此參考值之背光開啟時間比例。輸出單元24則根據接收/處理單元22所獲得之背光開啟時間比例產生脈衝寬度調變訊號M。 Regarding step S50, the brightness adjusting device 2 of Fig. 3 can be described in detail as an example. The receiving/processing unit 22 can receive the picture information A and obtain the reference value from the picture information A. Then, the receiving/processing unit 22 compares the reference value in the comparison table 200 in the storage unit 20 to obtain the corresponding reference value. The ratio of backlight turn-on time. The output unit 24 generates a pulse width modulation signal M according to the ratio of the backlight on time obtained by the receiving/processing unit 22.
於步驟S52中,步驟S50所產生之脈衝寬度調變訊號可輸入至LED驅動器以驅動背光模組之LED發光,如圖四A所示。另一方面,若亮度調整裝置本身即為LED驅動器或LED驅動器之一部分,於步驟S52中脈衝寬度調變訊號可回授至LED驅動器以驅動背光模組之LED發光,如圖四B所示。 In step S52, the pulse width modulation signal generated in step S50 can be input to the LED driver to drive the LED of the backlight module to emit light, as shown in FIG. 4A. On the other hand, if the brightness adjusting device itself is part of the LED driver or the LED driver, in step S52, the pulse width modulation signal can be fed back to the LED driver to drive the LED of the backlight module to emit light, as shown in FIG. 4B.
上述具體實施例之動態調整亮度之方法,其對照表可 對應一調變曲線,此調變曲線代表背光時間比例與參考值間之對應關係。調變曲線可為迦瑪曲線,並且其於停損點兩側之斜率不連續,如圖五所示。 The method for dynamically adjusting the brightness of the above specific embodiment, the comparison table can be Corresponding to a modulation curve, the modulation curve represents the correspondence between the backlight time ratio and the reference value. The modulation curve can be a gamma curve, and its slope on both sides of the stop loss point is discontinuous, as shown in Figure 5.
上述對照表以及調變曲線,可以下述方法以裝置完成。請一併參閱圖七A~D以及圖五,圖七A係繪示根據本發明之一具體實施例之對照表建立方法的步驟流程圖,圖七B係繪示執行圖七A中各步驟之單元的示意圖,圖七C~D則繪示圖七A中各步驟所形成之各對應曲線的示意圖。請注意,圖七B所繪示之各單元可設置於上述具體實施例之亮度調整裝置中,亦可獨立於亮度調整裝置之外,端看使用者或設計者需求而定,本發明並不加以限制。如圖七B所示,第二調整單元72連接第一調整單元70;第三調整單元74連接第二調整單元72;第四調整單元76連接第三調整單元74。此外,圖七C~D之各對應曲線係代表背光開啟時間比例D(Y軸)以及參考值R(X軸)間的對應關係。 The above comparison table and the modulation curve can be completed by the device in the following manner. Please refer to FIG. 7A to D and FIG. 5 together. FIG. 7A is a flow chart showing steps of a method for establishing a comparison table according to an embodiment of the present invention, and FIG. 7B is a diagram showing steps in FIG. 7A. Schematic diagram of the unit, FIG. 7C to D show a schematic diagram of each corresponding curve formed by each step in FIG. Please note that the units shown in FIG. 7B may be disposed in the brightness adjusting device of the above specific embodiment, or may be independent of the brightness adjusting device, depending on the needs of the user or the designer, and the present invention does not Limit it. As shown in FIG. 7B, the second adjusting unit 72 is connected to the first adjusting unit 70; the third adjusting unit 74 is connected to the second adjusting unit 72; and the fourth adjusting unit 76 is connected to the third adjusting unit 74. In addition, the corresponding curves of FIG. 7C to D represent the correspondence relationship between the backlight opening time ratio D (Y axis) and the reference value R (X axis).
如圖七A以及圖七B所示,於步驟S60,第一調整單元70將背光開啟時間比例D以及參考值R線性匹配而獲得線性之第一對應曲線C2(如圖七C所示)。於步驟S62,第二調整單元72可設定第一參考值R2,並根據第一參考值R2以及第一對應曲線C2獲得第一背光開啟時間比例D2,其中,第一參考值R2以及第一背光開啟時間比例D2對應至第一對應曲線C2上之位置可作為停損點P2。 As shown in FIG. 7A and FIG. 7B, in step S60, the first adjusting unit 70 linearly matches the backlight on-time ratio D and the reference value R to obtain a linear first corresponding curve C2 (as shown in FIG. 7C). In step S62, the second adjusting unit 72 may set the first reference value R2, and obtain a first backlight opening time ratio D2 according to the first reference value R2 and the first corresponding curve C2, wherein the first reference value R2 and the first backlight The position of the opening time ratio D2 corresponding to the first corresponding curve C2 can be used as the stop loss point P2.
於步驟S64,第三調整單元74可將第一對應曲線C2上代表小於第一參考值R2之參考值R所匹配之背光開啟時間比例D更改為第一背光開啟時間比例D2,進而獲得第二對應曲線C3(如圖七D所示)。於步驟S66,第四調整單元76可根據一迦瑪值對第二對應曲線C3進行迦瑪校正,以獲得調變曲線C1(如圖五所示)。此外,於步驟S66,第四調整單元76還可根據調變曲線C1獲得關於背光開啟時間比例D以及參考值R之對照表。於實務中,第四調整單元可進一步連接上述具體實施例之儲存單元以儲存對照表於儲存單元中。藉由上述方法,對照表及其對應之調變曲線可完成並儲存於上述具體實施例之儲存單元中。 In step S64, the third adjusting unit 74 may change the backlight on-time ratio D corresponding to the reference value R that is smaller than the first reference value R2 on the first corresponding curve C2 to the first backlight-on time ratio D2, thereby obtaining the second Corresponding to curve C3 (as shown in Figure 7D). In step S66, the fourth adjusting unit 76 may perform gamma correction on the second corresponding curve C3 according to a gamma value to obtain a modulation curve C1 (as shown in FIG. 5). In addition, in step S66, the fourth adjusting unit 76 may further obtain a comparison table about the backlight opening time ratio D and the reference value R according to the modulation curve C1. In practice, the fourth adjustment unit may further connect the storage unit of the above specific embodiment to store the comparison table in the storage unit. By the above method, the comparison table and its corresponding modulation curve can be completed and stored in the storage unit of the above specific embodiment.
相較於先前技術,本發明所提供之亮度調整裝置以及動態調整背光模組之亮度之方法,可藉由設定停損點使背光模組發出之光源不至於因畫面變化劇烈時產生連續性的大幅度變化,進而避免畫面閃爍的現象。由於本發明之亮度調整裝置以及動態調整背光模組之亮度之方法並未降低背光變化靈敏度,因此,將不會造成背光變化跟不上畫面變化致使部分畫面搭配性錯誤之狀況發生,同時也不會增加演算法的複雜度。 Compared with the prior art, the brightness adjusting device provided by the present invention and the method for dynamically adjusting the brightness of the backlight module can make the light source emitted by the backlight module not to be continuous due to the dramatic change of the screen by setting the stop loss point. Great changes, and thus avoid the phenomenon of flickering. Since the brightness adjusting device of the present invention and the method for dynamically adjusting the brightness of the backlight module do not reduce the sensitivity of the backlight change, there is no possibility that the backlight change cannot be changed with the screen change, causing some screen mismatching conditions to occur, and neither Will increase the complexity of the algorithm.
藉由以上較佳具體實施例之詳述,係希望能更加清楚描述本發明之特徵與精神,而並非以上述所揭露的較佳具體實施例來對本發明之範疇加以限制。相反地,其目的是希望能涵蓋各種改變及具相等性的安排於本發明所欲申請之專利範圍的範疇內。因此,本發明所申請之專利範圍的 範疇應該根據上述的說明作最寬廣的解釋,以致使其涵蓋所有可能的改變以及具相等性的安排。 The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed. Therefore, the scope of the patent claimed by the present invention The scope should be interpreted broadly according to the above description so that it covers all possible changes and arrangements of equality.
1‧‧‧動態背光控制系統 1‧‧‧Dynamic backlight control system
10‧‧‧動態背光控制單元 10‧‧‧Dynamic backlight control unit
12‧‧‧LED背光模組 12‧‧‧LED backlight module
14‧‧‧畫面資訊 14‧‧‧ Screen Information
16‧‧‧液晶面板 16‧‧‧LCD panel
100‧‧‧發光控制訊號 100‧‧‧Lighting control signal
102‧‧‧液晶控制訊號 102‧‧‧LCD control signal
F‧‧‧特性曲線 F‧‧‧ characteristic curve
X‧‧‧基準點 X‧‧‧ benchmark
Y‧‧‧背光開始時間比例 Y‧‧‧Backlight start time ratio
2、4‧‧‧亮度調整裝置 2, 4‧‧‧ brightness adjustment device
20、40‧‧‧儲存單元 20, 40‧‧‧ storage unit
22、42‧‧‧接收/處理單元 22, 42‧‧‧ receiving/processing unit
24、44‧‧‧輸出單元 24, 44‧‧‧ Output unit
200、400‧‧‧對照表 200, 400‧‧‧ comparison table
A‧‧‧畫面資料 A‧‧‧ screen material
M‧‧‧脈衝寬度調變訊號 M‧‧‧ pulse width modulation signal
3‧‧‧LED驅動器 3‧‧‧LED driver
C1‧‧‧調變曲線 C1‧‧‧ modulation curve
C2‧‧‧第一對應曲線 C2‧‧‧ first corresponding curve
C3‧‧‧第二對應曲線 C3‧‧‧second correspondence curve
R、R1‧‧‧參考值 R, R1‧‧‧ reference value
D、D1‧‧‧背光開啟時間比例 D, D1‧‧‧ backlight opening time ratio
P1、P2‧‧‧停損點 P1, P2‧‧‧ stop loss points
D2‧‧‧第一背光開啟時間比例 D2‧‧‧First backlight turn-on time ratio
R2‧‧‧第一參考值 R2‧‧‧ first reference value
70‧‧‧第一調整單元 70‧‧‧First adjustment unit
72‧‧‧第二調整單元 72‧‧‧Second adjustment unit
74‧‧‧第三調整單元 74‧‧‧ Third adjustment unit
76‧‧‧第四調整單元 76‧‧‧Fourth adjustment unit
S50~S52‧‧‧流程步驟 S50~S52‧‧‧ Process steps
S60~S66‧‧‧流程步驟 S60~S66‧‧‧ Process steps
圖一係繪示先前技術之動態背光控制系統的示意圖。 Figure 1 is a schematic diagram showing a prior art dynamic backlight control system.
圖二係繪示圖一之動態背光控制系統以脈衝寬度調變訊號動態控制背光模組的特性曲線圖。 FIG. 2 is a characteristic diagram of the dynamic backlight control system of FIG. 1 dynamically controlling the backlight module by using a pulse width modulation signal.
圖三係繪示根據本發明之一具體實施例之亮度調整裝置的示意圖。 Figure 3 is a schematic illustration of a brightness adjustment device in accordance with an embodiment of the present invention.
圖四A係繪示根據本發明之另一具體實施例之亮度調整裝置連接LED驅動器的示意圖。 FIG. 4A is a schematic diagram showing the connection of an LED driver to a brightness adjusting device according to another embodiment of the present invention.
圖四B係繪示根據本發明之另一具體實施例之亮度調整裝置的示意圖。 FIG. 4B is a schematic diagram showing a brightness adjusting device according to another embodiment of the present invention.
圖五係繪示圖一之對照表所對應之調變曲線的示意圖。 Figure 5 is a schematic diagram showing the modulation curve corresponding to the comparison table of Figure 1.
圖六係繪示根據本發明之一具體實施例之動態調整背光模組之亮度之方法的步驟流程圖。 6 is a flow chart showing the steps of a method for dynamically adjusting the brightness of a backlight module according to an embodiment of the present invention.
圖七A係繪示根據本發明之一具體實施例之對照表建立方法的步驟流程圖。 Figure 7A is a flow chart showing the steps of a method for establishing a look-up table according to an embodiment of the present invention.
圖七B係繪示執行圖七A中各步驟之單元的示意圖。 Figure 7B is a schematic diagram showing the units performing the steps in Figure 7A.
圖七C~D係繪示圖七A中各步驟所形成之各對應曲線的示意圖。 Figure 7C~D is a schematic diagram showing the corresponding curves formed by the steps in Figure 7A.
2‧‧‧亮度調整裝置 2‧‧‧Brightness adjustment device
20‧‧‧儲存單元 20‧‧‧ storage unit
22‧‧‧接收/處理單元 22‧‧‧Receiving/Processing Unit
24‧‧‧輸出單元 24‧‧‧Output unit
200‧‧‧對照表 200‧‧‧ comparison table
A‧‧‧畫面資料 A‧‧‧ screen material
M‧‧‧脈衝寬度調變訊號 M‧‧‧ pulse width modulation signal
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