TW202343419A - Dynamic brightness control method for OLED display panel, OLED display device, and information processing device making changes unnoticed in background brightness when the under-screen fingerprint recognition device is being enabled/disabled - Google Patents
Dynamic brightness control method for OLED display panel, OLED display device, and information processing device making changes unnoticed in background brightness when the under-screen fingerprint recognition device is being enabled/disabled Download PDFInfo
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本發明係關於OLED顯示裝置之技術領域,尤指一種OLED顯示面板之動態亮度調控方法。The present invention relates to the technical field of OLED display devices, and in particular, to a dynamic brightness control method for an OLED display panel.
已知,有機發光二極體(Organic Light-Emitting Diode, OLED)具有自發光特性、高亮度、高對比、廣視角、功率消耗、高反應速率等優點, 因此目前已被廣泛地應用於自發光顯示面板之製作,包括主動式OLED(即,AMOLED)顯示面板及被動式OLED(即,PMOLED)顯示面板。圖1為習知的一種OLED顯示裝置的方塊圖。如圖1所示,該OLED顯示裝置1a應用於一電子裝置(如:智慧型手機)之中,且主要包括一OLED顯示面板11a和至少一顯示驅動晶片12a。It is known that organic light-emitting diodes (OLEDs) have the advantages of self-luminous properties, high brightness, high contrast, wide viewing angle, power consumption, high reaction rate, etc., so they have been widely used in self-luminous applications. The production of display panels includes active OLED (i.e., AMOLED) display panels and passive OLED (i.e., PMOLED) display panels. FIG. 1 is a block diagram of a conventional OLED display device. As shown in FIG. 1 , the OLED display device 1a is used in an electronic device (such as a smart phone) and mainly includes an OLED display panel 11a and at least one
應知道,該OLED顯示面板11a包括M×N個OLED元件(即,子畫素)以及用以控制該M×N個OLED元件發光的M×N個畫素電路單元。在現有技術中,各所述畫素電路單元耦接一掃描信號(即,scan)和一發光控制信號(即,EM),其中發光控制信號為一PWM信號,故可以透過調整該PWM信號的佔空比實現對於各所述OLED元件的亮度調控。It should be understood that the OLED display panel 11a includes M×N OLED elements (ie, sub-pixels) and M×N pixel circuit units used to control the M×N OLED elements to emit light. In the prior art, each of the pixel circuit units is coupled to a scanning signal (i.e., scan) and a light-emitting control signal (i.e., EM). The light-emitting control signal is a PWM signal, so it can be adjusted by adjusting the PWM signal. The duty cycle realizes the brightness control of each of the OLED elements.
請參閱圖2,其顯示數位亮度值(Digital Brightness Value, DBV)相對於PWM佔空比的曲線圖。依據圖2可知,現有技術將數位亮度值的分割為多個數值範圍。因此,可以將數值5至318定義為區間B,且將數值319至2047定義為區間A。當數位亮度值(即,用戶手動調整背景顯示亮度)落於區間B,則該顯示驅動晶片12a利用變換PWM信號的佔空比的方式實現對於OLED元件的亮度調控。並且,當數位亮度值落於區間A時,PWM信號的佔空比為100%。See Figure 2, which shows a graph of Digital Brightness Value (DBV) versus PWM duty cycle. According to Figure 2, it can be seen that the existing technology divides the digital brightness value into multiple numerical ranges. Therefore,
另一方面,該顯示驅動晶片12a內部必然整合有一伽瑪調整(校正)單元。顯示器的製造商在完成伽瑪校正程序之後,會在該顯示驅動晶片12a之中設置複數組伽瑪設定值,業界慣稱為Gamma綁點,例如:Gamma 0.45、Gamma 1.8、Gamma 2.0、Gamma 2.2、Gamma 2.4、Gamma 2.6等。在現有技術中,利用變更伽瑪設定值(即,綁點)的方式同樣可以對應地變更數位亮度值,達成對於OLED顯示面板11a的亮度調控。On the other hand, a gamma adjustment (correction) unit must be integrated inside the
然而,隨著屏下式指紋識別裝置被廣泛地整合在如智慧型手機之行動電子裝置之中,前述現有技術所採用之利用調整PWM信號(即,發光控制信號EM)的佔空比實現對於OLED元件的亮度調控之方式於是出現了一些缺陷。However, as under-screen fingerprint recognition devices are widely integrated into mobile electronic devices such as smartphones, the aforementioned prior art adopts the method of adjusting the duty cycle of the PWM signal (ie, the luminescence control signal EM) to achieve There are some flaws in the way the brightness of OLED components is controlled.
舉例而言,在數位亮度值落於區間B的情況下,如圖2所示PWM信號的佔空比會小於100%,同時該顯示驅動晶片12a會對應地設定一Gamma綁點,如Gamma 1.8。此時,若屏下式指紋識別裝置被啟用,則PWM信號的佔空比會執行跳升至100%,但Gamma綁點則未對應地變更,導致背景亮度出現人眼可以感受到的變化。For example, when the digital brightness value falls within the interval B, the duty cycle of the PWM signal will be less than 100% as shown in Figure 2, and the
由上述說明可知,本領域亟需一種新式的OLED顯示面板之動態亮度調控方法。From the above description, it can be seen that a new dynamic brightness control method for OLED display panels is urgently needed in this field.
本發明之主要目的在於提供一種OLED顯示面板之動態亮度調控方法,係由一顯示驅動晶片執行。在應用本發明之動態亮度調控方法的情況下,該顯示驅動晶片係能實現該OLED顯示面板之背景亮度無縫切換,使用戶在屏下式指紋識別裝置啟用/關閉的過程中不會感受到背景亮度的差異性改變。The main purpose of the present invention is to provide a dynamic brightness control method for an OLED display panel, which is executed by a display driver chip. When the dynamic brightness control method of the present invention is applied, the display driver chip can realize seamless switching of the background brightness of the OLED display panel, so that the user will not feel any discomfort during the activation/deactivation process of the under-screen fingerprint recognition device. Differential changes in background brightness.
為達成上述目的,本發明提出所述OLED顯示面板之動態亮度調控方法,其係一顯示驅動晶片執行,且包括以下步驟: 依據一亮度調節命令決定一數位亮度值(Digital Brightness Value, DBV); 在該數位亮度值大於一第一閥值且小於一第二閥值的情況之下,隨著一屏下式指紋識別裝置之啟用維持所述數位亮度值; 在該數位亮度值小於該第一閥值的情況之下,隨著所述屏下式指紋識別裝置之啟用將所述數位亮度值調整至所述第一閥值。 In order to achieve the above object, the present invention proposes a dynamic brightness control method for an OLED display panel, which is executed by a display driver chip and includes the following steps: Determine a digital brightness value (DBV) according to a brightness adjustment command; In the case where the digital brightness value is greater than a first threshold and less than a second threshold, maintaining the digital brightness value with the activation of an under-screen fingerprint recognition device; When the digital brightness value is less than the first threshold, the digital brightness value is adjusted to the first threshold as the under-screen fingerprint recognition device is activated.
在一實施例中,在將所述數位亮度值調整至所述第一閥值之後,係更進一步地對由一上位機所傳送的一輸入顯示數據進行一數據縮放(Data scaling)處理。In one embodiment, after adjusting the digital brightness value to the first threshold, a data scaling process is further performed on an input display data transmitted by a host computer.
在一可行實施例中,該顯示驅動晶片執行所述數據縮放處理之時,係自包括複數個所述數據縮放參數與複數個參考數位亮度值的一二維查找表之中查找出與所述數位亮度值對應的一個參考數位亮度值,從而依據該參考數位亮度值獲得對應的一個數據縮放參數,最終利用該數據縮放參數將該輸入顯示數據調整為一輸出顯示數據。In a possible embodiment, when the display driver chip performs the data scaling process, it searches for the value corresponding to the data scaling parameter from a two-dimensional lookup table including a plurality of the data scaling parameters and a plurality of reference digital brightness values. A reference digital brightness value corresponding to the digital brightness value, thereby obtaining a corresponding data scaling parameter based on the reference digital brightness value, and finally using the data scaling parameter to adjust the input display data to an output display data.
在另一可行實施例中,該顯示驅動晶片執行所述數據縮放處理之時,係在包括複數個所述數據縮放參數與複數個參考數位亮度值的一二維查找表之中執行一數據查找操作以及一插值操作,從而獲得一數據縮放參數,最終利用該數據縮放參數將該輸入顯示數據調整為一輸出顯示數據。In another possible embodiment, when the display driver chip performs the data scaling process, a data lookup is performed in a two-dimensional lookup table including a plurality of the data scaling parameters and a plurality of reference digital brightness values. operation and an interpolation operation to obtain a data scaling parameter, and finally use the data scaling parameter to adjust the input display data to an output display data.
並且,本發明同時提供一種OLED顯示裝置,其包括至少一顯示驅動晶片和一OLED顯示面板,其特徵在於,該顯示驅動晶片執行一OLED顯示面板之動態亮度調控方法,從而在一屏下式指紋識別裝置啟用/關閉之時動態調整該OLED顯示面板的顯示亮度;所述OLED顯示面板之動態亮度調控包括以下步驟: 依據一亮度調節命令決定一數位亮度值(Digital Brightness Value, DBV); 在該數位亮度值大於一第一閥值且小於一第二閥值的情況之下,隨著一屏下式指紋識別裝置之啟用維持所述數位亮度值; 在該數位亮度值小於該第一閥值的情況之下,隨著所述屏下式指紋識別裝置之啟用將所述數位亮度值調整至所述第一閥值。 Moreover, the present invention also provides an OLED display device, which includes at least one display driver chip and an OLED display panel. It is characterized in that the display driver chip executes a dynamic brightness control method of the OLED display panel, thereby forming a fingerprint under one screen. Dynamically adjust the display brightness of the OLED display panel when the recognition device is enabled/disabled; the dynamic brightness control of the OLED display panel includes the following steps: Determine a digital brightness value (DBV) according to a brightness adjustment command; In the case where the digital brightness value is greater than a first threshold and less than a second threshold, maintaining the digital brightness value with the activation of an under-screen fingerprint recognition device; When the digital brightness value is less than the first threshold, the digital brightness value is adjusted to the first threshold as the under-screen fingerprint recognition device is activated.
在一實施例中,在將所述數位亮度值調整至所述第一閥值之後,係更進一步地對由一上位機所傳送的一輸入顯示數據進行一數據縮放(Data scaling)處理。In one embodiment, after adjusting the digital brightness value to the first threshold, a data scaling process is further performed on an input display data transmitted from a host computer.
在一可行實施例中,該顯示驅動晶片執行所述數據縮放處理之時,係自包括複數個所述數據縮放參數與複數個參考數位亮度值的一二維查找表之中查找出與所述數位亮度值對應的一個參考數位亮度值,從而依據該參考數位亮度值獲得對應的一個數據縮放參數,最終利用該數據縮放參數將該輸入顯示數據調整為一輸出顯示數據。In a possible embodiment, when the display driver chip performs the data scaling process, it searches for the value corresponding to the data scaling parameter from a two-dimensional lookup table including a plurality of the data scaling parameters and a plurality of reference digital brightness values. A reference digital brightness value corresponding to the digital brightness value, thereby obtaining a corresponding data scaling parameter based on the reference digital brightness value, and finally using the data scaling parameter to adjust the input display data to an output display data.
在另一可行實施例中,該顯示驅動晶片執行所述數據縮放處理之時,係在包括複數個所述數據縮放參數與複數個參考數位亮度值的一二維查找表之中執行一數據查找操作以及一插值操作,從而獲得一數據縮放參數,最終利用該數據縮放參數將該輸入顯示數據調整為一輸出顯示數據。In another possible embodiment, when the display driver chip performs the data scaling process, a data lookup is performed in a two-dimensional lookup table including a plurality of the data scaling parameters and a plurality of reference digital brightness values. operation and an interpolation operation to obtain a data scaling parameter, and finally use the data scaling parameter to adjust the input display data to an output display data.
本發明同時提供一種資訊處理裝置,其具有如前述之OLED顯示裝置。在可行的實施例中,該資訊處理裝置可為智慧型手機、智慧型手錶、平板電腦、智慧型電視、筆記型電腦、一體式電腦、門禁裝置、或電子式門鎖The present invention also provides an information processing device, which has the aforementioned OLED display device. In a feasible embodiment, the information processing device can be a smart phone, a smart watch, a tablet computer, a smart TV, a notebook computer, an all-in-one computer, an access control device, or an electronic door lock.
為使 貴審查委員能進一步瞭解本發明之結構、特徵、目的、與其優點,茲附以圖式及較佳具體實施例之詳細說明如後。In order to enable the review committee to further understand the structure, characteristics, purpose, and advantages of the present invention, drawings and detailed descriptions of preferred embodiments are attached below.
請參閱圖3,其顯示應用本發明之一種OLED顯示面板之動態亮度調控方法的一OLED顯示裝置的方塊圖。如圖3所示,該OLED顯示裝置1應用於一電子裝置(如:智慧型手機)之中,且主要包括一OLED顯示面板11和至少一顯示驅動晶片12。更進一步地說明,該OLED顯示面板11包括M×N個OLED元件(即,子畫素)以及用以控制該M×N個OLED元件發光的M×N個畫素電路單元。在常規的設計中,各所述畫素電路單元耦接一掃描信號(即,scan)和一發光控制信號(即,EM),其中發光控制信號為一PWM信號,故可以透過調整該PWM信號的佔空比實現對於各所述OLED元件的亮度調控。請再次參閱圖2。在常規的設計中,係將數位亮度值的分割為多個數值範圍。舉例而言,將數值5至318定義為區間B,且將數值319至2047定義為區間A。Please refer to FIG. 3 , which shows a block diagram of an OLED display device using a dynamic brightness control method for an OLED display panel of the present invention. As shown in FIG. 3 , the
圖4顯示本發明之一種OLED顯示面板之動態亮度調控方法的流程圖。如圖3與圖4所示,在該顯示驅動晶片12執行本發明之OLED顯示面板之動態亮度調控的情況下,係首先執行步驟S1:依據一亮度調節命令決定一數位亮度值(Digital Brightness Value, DBV)。舉例而言,在用戶手動調整其智慧型手機的主畫面的背景亮度之後,智慧型手機的即傳送一亮度調節命令至該顯示驅動晶片12,使該顯示驅動晶片12依據該亮度調節命令而一致性地調高/降低該OLED顯示面板11a的背景亮度。FIG. 4 shows a flow chart of a dynamic brightness control method for an OLED display panel according to the present invention. As shown in FIGS. 3 and 4 , when the
進一步地,該方法流程細執行步驟S2:在該數位亮度值大於一第一閥值且小於一第二閥值的情況之下,隨著一屏下式指紋識別裝置之啟用維持所述數位亮度值。舉例而言,如圖2所示,數值318被定義為所述第一閥值,數值1600或2047被定義為所述第一閥值。因此,可以進一步地將數值5至318定義為區間B,並將數值319至2047定義為區間A。在應用本發明之方法的情況下,如圖2所示,當DBV(即,數位亮度值)變化至落在區間之內,PWM信號的佔空比為100%。因此,若此時屏下式指紋識別裝置被啟用,那麼背景亮度也不會有明顯變化,原因在於屏下式指紋識別裝置啟用之時,該顯示驅動晶片12a會將PWM信號的佔空比調升至100%。Further, the method flow executes step S2: when the digital brightness value is greater than a first threshold and less than a second threshold, maintain the digital brightness with the activation of an under-screen fingerprint recognition device. value. For example, as shown in Figure 2, a value of 318 is defined as the first threshold, and a value of 1600 or 2047 is defined as the first threshold. Therefore, the
再次重複說明,如圖2所示,在數位亮度值落於區間B的情況下,PWM信號的佔空比會小於100%,同時該顯示驅動晶片12a會對應地設定一Gamma綁點,如Gamma 1.8。此時,若屏下式指紋識別裝置被啟用,則PWM信號的佔空比會執行跳升至100%,但Gamma綁點則未對應地變更,導致背景亮度出現人眼可以感受到的變化。然而,執行本發明之方法可以解決此一問題。於步驟S3,係在該數位亮度值(即,DBV)小於該第一閥值(TH1,例如為318)的情況之下,隨著所述屏下式指紋識別裝置之啟用將所述數位亮度值調整至所述第一閥值。進一步地,如果出現亮度增大,該顯示驅動晶片12還可以在將所述數位亮度值調整至所述第一閥值之後,更進一步地對由一上位機(如:智慧型手機的應用處理器)所傳送的一輸入顯示數據進行一數據縮放(Data scaling)處理。如此一來,在應用本發明之動態亮度調控方法的情況下,該顯示驅動晶片12係能實現該OLED顯示面板11之背景亮度無縫切換,使用戶在屏下式指紋識別裝置啟用/關閉的過程中不會感受到背景亮度的差異性改變。Let me reiterate again, as shown in Figure 2, when the digital brightness value falls within the interval B, the duty cycle of the PWM signal will be less than 100%, and the
圖5顯示包括複數個數據縮放參數與複數個參考數位亮度值的一二維查找表。補充說明的是,如圖5所示,執行所述數據縮放(Data scaling)處理時,該顯示驅動晶片12自包括複數個數據縮放參數與複數個參考數位亮度值的一二維查找表之中查找出與所述數位亮度值對應的一個參考數位亮度值,從而依據該參考數位亮度值獲得對應的一個數據縮放參數(DS_r1, DS_r2, DS_r3),最終利用該數據縮放參數將該輸入顯示數據調整為一輸出顯示數據。FIG. 5 shows a one-dimensional lookup table including a plurality of data scaling parameters and a plurality of reference digital brightness values. It should be supplemented that, as shown in FIG. 5 , when performing the data scaling process, the
當然,在某些情況下,該顯示驅動晶片12無法直接透過查表的方式獲得所述數據縮放參數。此時,在完成數據查找操作之後,該顯示驅動晶片12可以進一步執行一插值操作(通常為內插操作),從而獲得一個數據縮放參數,最終利用該數據縮放參數將該輸入顯示數據調整為一輸出顯示數據。Of course, in some cases, the
如此,上述已完整且清楚地說明本發明之一種OLED顯示面板之動態亮度調控方法;並且,經由上述可得知本發明具有下列優點:In this way, the above has completely and clearly explained the dynamic brightness control method of an OLED display panel of the present invention; and, from the above, it can be known that the present invention has the following advantages:
(1)本發明揭示一種OLED顯示面板之動態亮度調控方法,係由一顯示驅動晶片執行。在應用本發明之畫素亮度補償方法的情況下,該顯示驅動晶片係能實現該OLED顯示面板之背景亮度無縫切換,使用戶在屏下式指紋識別裝置啟用/關閉的過程中不會感受到背景亮度的差異性改變。(1) The present invention discloses a dynamic brightness control method for an OLED display panel, which is executed by a display driver chip. When the pixel brightness compensation method of the present invention is applied, the display driver chip can realize seamless switching of the background brightness of the OLED display panel, so that the user will not feel any discomfort during the activation/deactivation process of the under-screen fingerprint recognition device. to differential changes in background brightness.
(2)本發明同時提供一種OLED顯示裝置,其包括至少一顯示驅動晶片和一OLED顯示面板,且該顯示驅動晶片用以執行前述本發明之一種OLED顯示面板之動態亮度調控方法。(2) The present invention also provides an OLED display device, which includes at least one display driver chip and an OLED display panel, and the display driver chip is used to perform the aforementioned dynamic brightness control method of an OLED display panel of the present invention.
(3)本發明同時提供一種資訊處理裝置,其具有如前所述本發明之OLED顯示裝置。並且,該資訊處理裝置是選自於由智慧型手機、智慧型手錶、平板電腦、智慧型電視、筆記型電腦、一體式電腦、門禁裝置、和電子式門鎖所組成群組之中的一種電子裝置。(3) The present invention also provides an information processing device, which has the OLED display device of the present invention as described above. Moreover, the information processing device is one selected from the group consisting of smart phones, smart watches, tablet computers, smart TVs, notebook computers, all-in-one computers, access control devices, and electronic door locks. electronic devices.
必須加以強調的是,前述本案所揭示者乃為較佳實施例,舉凡局部之變更或修飾而源於本案之技術思想而為熟習該項技藝之人所易於推知者,俱不脫本案之專利權範疇。It must be emphasized that the foregoing disclosed in this case are preferred embodiments. Any partial changes or modifications derived from the technical ideas of this case and easily inferred by those familiar with the art do not deviate from the patent of this case. category of rights.
綜上所陳,本案無論目的、手段與功效,皆顯示其迥異於習知技術,且其首先發明合於實用,確實符合發明之專利要件,懇請 貴審查委員明察,並早日賜予專利俾嘉惠社會,是為至禱。To sum up, regardless of the purpose, means and effects of this case, it shows that it is completely different from the conventional technology, and that the invention is practical first, and indeed meets the patent requirements for inventions. I sincerely ask the review committee to take a clear look and grant the patent as soon as possible for your benefit. Society is a prayer for the Supreme Being.
1a:OLED顯示裝置
11a:OLED顯示面板
12a:顯示驅動晶片
1:OLED顯示裝置
11:OLED顯示面板
12:顯示驅動晶片
S1:依據一亮度調節命令決定一數位亮度值;
S2:在該數位亮度值大於一第一閥值且小於一第二閥值的情況之下,隨著一屏下式指紋識別裝置之啟用維持所述數位亮度值;
S3:在該數位亮度值小於該第一閥值的情況之下,隨著所述屏下式指紋識別裝置之啟用將所述數位亮度值調整至所述第一閥值。
1a:OLED display device
11a:
圖1為習知的一種OLED顯示裝置的方塊圖; 圖2為顯示數位亮度值相對於PWM佔空比的曲線圖; 圖3為應用本發明之一種OLED顯示面板之動態亮度調控方法的一OLED顯示裝置的方塊圖; 圖4為本發明之一種OLED顯示面板之動態亮度調控方法的流程圖;以及 圖5為包括複數個數據縮放參數與複數個參考數位亮度值的一二維查找表。 Figure 1 is a block diagram of a conventional OLED display device; Figure 2 is a graph showing the digital brightness value relative to the PWM duty cycle; Figure 3 is a block diagram of an OLED display device applying a dynamic brightness control method of an OLED display panel according to the present invention; Figure 4 is a flow chart of a dynamic brightness control method for an OLED display panel according to the present invention; and FIG. 5 is a two-dimensional lookup table including a plurality of data scaling parameters and a plurality of reference digital brightness values.
S1:依據一亮度調節命令決定一數位亮度值 S1: Determine a digital brightness value according to a brightness adjustment command
S2:在該數位亮度值大於一第一閥值且小於一第二閥值的情況之下,隨著一屏下式指紋識別裝置之啟用維持所述數位亮度值 S2: When the digital brightness value is greater than a first threshold and less than a second threshold, maintain the digital brightness value with the activation of an under-screen fingerprint recognition device.
S3:在該數位亮度值小於該第一閥值的情況之下,隨著所述屏下式指紋識別裝置之啟用將所述數位亮度值調整至所述第一閥值 S3: When the digital brightness value is less than the first threshold, adjust the digital brightness value to the first threshold as the under-screen fingerprint recognition device is activated
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