TWI744600B - Driving method for display apparatus - Google Patents

Driving method for display apparatus Download PDF

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TWI744600B
TWI744600B TW108105134A TW108105134A TWI744600B TW I744600 B TWI744600 B TW I744600B TW 108105134 A TW108105134 A TW 108105134A TW 108105134 A TW108105134 A TW 108105134A TW I744600 B TWI744600 B TW I744600B
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frequency
pixel
gray scale
pixels
display device
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TW108105134A
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TW202009916A (en
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陳信學
劉品妙
陳亦偉
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友達光電股份有限公司
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Priority to CN201910709968.4A priority Critical patent/CN110379362B/en
Priority to US16/528,677 priority patent/US20200051492A1/en
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Abstract

A driving method for a display apparatus is provided, wherein the display apparatus includes a plurality of pixels. The method includes the following steps: obtaining a first gray level and a second gray level corresponding to a first pixel and a second pixel among the pixels based on a display data, wherein the first gray level and the second gray level are different; determining a first frequency and a second frequency according to the first gray level and the second gray level; and driving the first pixel to operate in the first frequency and driving the second pixel to operate in the second frequency at the same time, wherein the first frequency and the second frequency are different.

Description

顯示裝置的驅動方法Driving method of display device

本發明是有關於一種顯示裝置，且特別是有關於一種顯示裝置的驅動方法。The present invention relates to a display device, and more particularly to a driving method of the display device.

現有的顯示裝置在顯示靜態畫面或是變動較少或緩慢的畫面時，可以通過降低頻閃頻率（Flicker Frequency）的方式達到節能的目的。這是因為當畫素的更新頻率愈低，消耗的能量愈少。目前常用的節能技術是一次降低全部畫素的頻率，讓所有畫素操作在低頻模式，但這樣一來，隨著更新頻率降低，畫面閃爍現象也會愈來愈明顯，造成影像品質下降。如何在維持影像品質的前提下來達到節能的目的，成為目前顯示裝置發展上的一個待解決的問題。When the existing display device displays a static picture or a picture with little or slow change, the purpose of energy saving can be achieved by reducing the flicker frequency (Flicker Frequency). This is because the lower the update frequency of pixels, the less energy is consumed. At present, the commonly used energy-saving technology is to reduce the frequency of all pixels at once, so that all pixels are operated in low-frequency mode, but in this way, as the update frequency decreases, the flickering phenomenon of the screen will become more and more obvious, resulting in a decrease in image quality. How to achieve the purpose of energy saving while maintaining image quality has become a problem to be solved in the development of current display devices.

本發明提供一種顯示裝置的驅動方法，能夠個別調整畫素的頻率，提供良好的影像品質與更佳的節能效果。The present invention provides a driving method of a display device, which can individually adjust the frequency of the pixels to provide good image quality and better energy-saving effects.

本發明的一種顯示裝置的驅動方法，其中顯示裝置包括多個畫素。驅動方法包括以下步驟：根據顯示資料獲得對應這些畫素中的第一畫素與第二畫素的第一灰階值與第二灰階值，其中第一灰階值與第二灰階值不相同；根據第一灰階值與第二灰階值決定第一頻率與第二頻率；以及驅動第一畫素操作在第一頻率，且同時驅動第二畫素操作在第二頻率，其中第一頻率與第二頻率不相同。In a driving method of a display device of the present invention, the display device includes a plurality of pixels. The driving method includes the following steps: obtaining a first gray scale value and a second gray scale value corresponding to the first pixel and the second pixel of the pixels according to the display data, wherein the first gray scale value and the second gray scale value Not the same; determine the first frequency and the second frequency according to the first grayscale value and the second grayscale value; and drive the first pixel to operate at the first frequency, and simultaneously drive the second pixel to operate at the second frequency, where The first frequency is not the same as the second frequency.

在本發明的一實施例中，上述的驅動方法中，根據第一灰階值與第二灰階值決定第一頻率與第二頻率的步驟包括：將第一灰階值與第二灰階值與參考灰階範圍進行比較以決定第一頻率與第二頻率，其中，當第一灰階值落在參考灰階範圍外時第一頻率被判斷屬於低頻模態，且第二灰階值落在參考灰階範圍內時第二頻率被判斷屬於高頻模態，且第一頻率小於第二頻率。In an embodiment of the present invention, in the above-mentioned driving method, the step of determining the first frequency and the second frequency according to the first gray-scale value and the second gray-scale value includes: comparing the first gray-scale value and the second gray-scale value The value is compared with the reference gray-scale range to determine the first frequency and the second frequency. When the first gray-scale value falls outside the reference gray-scale range, the first frequency is judged to belong to the low-frequency mode, and the second gray-scale value When the second frequency falls within the reference grayscale range, it is determined that the second frequency belongs to the high-frequency mode, and the first frequency is smaller than the second frequency.

在本發明的一實施例中，上述的驅動方法中，參考灰階範圍為一連續的灰階範圍，其中參考灰階範圍的大小與第一頻率有關。In an embodiment of the present invention, in the above-mentioned driving method, the reference gray scale range is a continuous gray scale range, wherein the size of the reference gray scale range is related to the first frequency.

在本發明的一實施例中，上述的驅動方法中，根據第一灰階值與第二灰階值決定第一頻率與第二頻率的步驟還包括：根據第一畫素與第二畫素的顏色決定第一頻率或第二頻率。In an embodiment of the present invention, in the above-mentioned driving method, the step of determining the first frequency and the second frequency according to the first gray scale value and the second gray scale value further includes: according to the first pixel and the second pixel The color determines the first frequency or the second frequency.

在本發明的一實施例中，上述的驅動方法中，根據第一畫素與第二畫素的顏色決定第一頻率或第二頻率的步驟包括：根據顯示資料獲得這些畫素中的第三畫素的第三灰階值，其中當第三灰階值與第一灰階值相同但第三畫素與第一畫素的顏色不同時，第三畫素操作在第三頻率，且第三頻率不同於第一頻率。In an embodiment of the present invention, in the above-mentioned driving method, the step of determining the first frequency or the second frequency according to the colors of the first pixel and the second pixel includes: obtaining the third of these pixels according to the display data. The third gray-scale value of the pixel, where when the third gray-scale value is the same as the first gray-scale value but the color of the third pixel is different from that of the first pixel, the third pixel is operated at the third frequency, and the third pixel is operated at the third frequency. The third frequency is different from the first frequency.

在本發明的一實施例中，上述的驅動方法中，根據第一灰階值與第二灰階值決定第一頻率與第二頻率的步驟還包括：根據第一畫素與第二畫素的亮度決定第一頻率或第二頻率。In an embodiment of the present invention, in the above-mentioned driving method, the step of determining the first frequency and the second frequency according to the first gray scale value and the second gray scale value further includes: according to the first pixel and the second pixel The brightness determines the first frequency or the second frequency.

在本發明的一實施例中，上述的驅動方法中，根據第一畫素與第二畫素的亮度決定第一頻率或第二頻率的步驟包括：根據顯示資料獲得這些畫素中的第四畫素的第四灰階值，其中，第一畫素、第二畫素與第四畫素的顏色相同但第一灰階值、第二灰階值與第四灰階值彼此不同，第四畫素操作在第四頻率，且第一頻率、第二頻率與第四頻率也彼此不同。In an embodiment of the present invention, in the above-mentioned driving method, the step of determining the first frequency or the second frequency according to the brightness of the first pixel and the second pixel includes: obtaining the fourth of these pixels according to the display data. The fourth gray-scale value of the pixel, where the first pixel, the second pixel and the fourth pixel have the same color but the first gray-scale value, the second gray-scale value, and the fourth gray-scale value are different from each other. The four pixels operate at the fourth frequency, and the first frequency, the second frequency, and the fourth frequency are also different from each other.

在本發明的一實施例中，上述的驅動方法中，根據第一灰階值與第二灰階值的大小決定第一頻率與第二頻率的步驟還包括：通過環境光感測器以產生環境光感測信號；以及根據環境光感測信號調整第一頻率或第二頻率。In an embodiment of the present invention, in the above-mentioned driving method, the step of determining the first frequency and the second frequency according to the magnitude of the first gray-scale value and the second gray-scale value further includes: generating through an ambient light sensor Ambient light sensing signal; and adjusting the first frequency or the second frequency according to the ambient light sensing signal.

在本發明的一實施例中，上述的驅動方法中，根據環境光感測信號調整第一頻率或第二頻率的步驟還包括：根據環境光感測信號先後獲得第一環境光亮度與第二環境光亮度，其中當第二環境光亮度大於第一環境光亮度時，調降第一頻率或第二頻率。In an embodiment of the present invention, in the above-mentioned driving method, the step of adjusting the first frequency or the second frequency according to the ambient light sensing signal further includes: sequentially obtaining the first ambient light brightness and the second ambient light brightness according to the ambient light sensing signal. The ambient light brightness, wherein when the second ambient light brightness is greater than the first ambient light brightness, the first frequency or the second frequency is reduced.

在本發明的一實施例中，上述的驅動方法中，這些畫素的每一個包括發光二極體。In an embodiment of the present invention, in the above-mentioned driving method, each of these pixels includes a light-emitting diode.

基於上述，本發明的顯示裝置的驅動方法可以根據畫素的灰階值來選擇畫素的頻率。當第一畫素的灰階值與第二畫素不相同時，可以驅動第一畫素操作在第一頻率，驅動第二畫素操作在第二頻率，第一頻率不同於第二頻率。藉此達到有效調整顯示裝置的能耗。Based on the above, the driving method of the display device of the present invention can select the frequency of the pixel according to the gray scale value of the pixel. When the grayscale value of the first pixel is different from that of the second pixel, the first pixel can be driven to operate at the first frequency, and the second pixel can be driven to operate at the second frequency, and the first frequency is different from the second frequency. In this way, the energy consumption of the display device can be effectively adjusted.

為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

圖1是依照本發明一實施例的顯示裝置的裝置示意圖。請參照圖1，顯示裝置100包括多個畫素PX，這些畫素PX是以矩陣排列形成畫素陣列130。顯示裝置100至少還包括多條閘極線GL、多條資料線DL、閘極驅動電路110與顯示控制電路120。這些畫素PX配置於資料線DL與閘極線GL的交錯處，以通過相對應的閘極線GL與資料線DL來控制這些畫素PX的操作。顯示控制電路120接收顯示資料DATA且電性連接閘極驅動電路110以提供控制信號CS給閘極驅動電路110。閘極驅動電路110通過這些閘極線GL電性連接這些畫素PX，以根據控制信號CS驅動這些畫素PX。顯示控制電路120可以通過晶片或是電路設計的方法實施，本發明並不限制。FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention. 1, the display device 100 includes a plurality of pixels PX, and the pixels PX are arranged in a matrix to form a pixel array 130. The display device 100 at least further includes a plurality of gate lines GL, a plurality of data lines DL, a gate driving circuit 110 and a display control circuit 120. The pixels PX are arranged at the intersection of the data line DL and the gate line GL to control the operation of the pixels PX through the corresponding gate line GL and the data line DL. The display control circuit 120 receives the display data DATA and is electrically connected to the gate driving circuit 110 to provide a control signal CS to the gate driving circuit 110. The gate driving circuit 110 is electrically connected to the pixels PX through the gate lines GL to drive the pixels PX according to the control signal CS. The display control circuit 120 can be implemented by a chip or a circuit design method, and the present invention is not limited.

圖2是依照本發明一實施例的顯示裝置的驅動方法的流程圖。驅動方法200可適用於圖1的顯示裝置100，以下以顯示裝置100的元件來具體說明驅動方法200的實施方式。FIG. 2 is a flowchart of a driving method of a display device according to an embodiment of the invention. The driving method 200 can be applied to the display device 100 of FIG.

在步驟S210中，顯示控制電路120可以根據顯示資料DATA獲得對應這些畫素PX的灰階值（gray level），例如對應第一畫素PX1的第一灰階值與對應第二畫素PX2的第二灰階值，其中第一灰階值與第二灰階值可以不相同。接著，在步驟S220中，顯示控制電路120會根據第一灰階值與第二灰階值決定第一頻率與第二頻率，並對應地產生給第一畫素PX1的第一控制信號與給第二畫素PX2的第二控制信號。接著，在步驟S230中，閘極驅動電路110根據第一控制信號驅動第一畫素PX1操作在第一頻率，並且根據第二控制信號同時驅動第二畫素PX2操作在第二頻率，其中第一頻率與第二頻率可以不相同。圖1中的控制信號CS包括第一控制信號與第二控制信號。In step S210, the display control circuit 120 may obtain the gray levels corresponding to these pixels PX according to the display data DATA, for example, the first gray level corresponding to the first pixel PX1 and the gray level corresponding to the second pixel PX2. The second grayscale value, where the first grayscale value and the second grayscale value may be different. Next, in step S220, the display control circuit 120 determines the first frequency and the second frequency according to the first grayscale value and the second grayscale value, and correspondingly generates the first control signal and the second frequency for the first pixel PX1 The second control signal of the second pixel PX2. Next, in step S230, the gate driving circuit 110 drives the first pixel PX1 to operate at the first frequency according to the first control signal, and simultaneously drives the second pixel PX2 to operate at the second frequency according to the second control signal. The first frequency and the second frequency may be different. The control signal CS in FIG. 1 includes a first control signal and a second control signal.

以下將更具體說明實施內容。The implementation content will be described in more detail below.

在本實施例中，這些畫素PX可以是單色的子畫素。多個子畫素可以組成顯示裝置100的解析度中的一個顯示畫素。第一畫素PX1例如是紅色子畫素，第二畫素PX2例如是綠色子畫素，諸如此類。在其他實施例中，畫素PX也可以是顯示畫素，本發明並不限制。顯示裝置100可以是發光二極體（Light-emitting diode，LED）面板，例如Micro-LED面板或是Mini-LED面板，每個畫素PX具有發光二極體以發出單色光。但本發明不限制顯示裝置的類型，在其他的實施例中，顯示裝置100也可以是液晶面板或其他類型的顯示裝置。In this embodiment, these pixels PX may be monochromatic sub-pixels. A plurality of sub-pixels can constitute one display pixel in the resolution of the display device 100. The first pixel PX1 is, for example, a red sub-pixel, and the second pixel PX2 is, for example, a green sub-pixel, and so on. In other embodiments, the pixel PX may also be a display pixel, and the present invention is not limited. The display device 100 may be a light-emitting diode (LED) panel, such as a Micro-LED panel or a Mini-LED panel, and each pixel PX has a light-emitting diode to emit monochromatic light. However, the present invention does not limit the type of display device. In other embodiments, the display device 100 may also be a liquid crystal panel or other types of display devices.

圖3是一種顯示裝置的人眼可接受的灰階值與閃爍值的關係曲線示意圖。人眼對不同灰階程度的影像會有不同的閃爍值容忍度，圖3的曲線310是人眼可接受的閃爍值（ Flicker Value）隨著灰階值的變化曲線。一般來說，當灰階值位於中間時，人眼對於畫面的閃爍現象會比較敏感，需要提高畫素的更新頻率以避免造成視覺干擾而讓觀賞者不適，而隨著灰階值愈低或是愈接近兩端時，人眼對於偏亮或偏暗的畫面的閃爍變化較不敏感，所以能夠接受畫素使用較低的更新頻率。FIG. 3 is a schematic diagram of the relationship curve between the grayscale value and the flicker value acceptable to the human eye of a display device. Human eyes have different tolerance to flicker values for images with different gray levels. The curve 310 in FIG. 3 is a curve of the flicker value acceptable to the human eye (Flicker Value) with the gray level value. Generally speaking, when the grayscale value is in the middle, the human eye will be more sensitive to the flickering phenomenon of the picture. It is necessary to increase the pixel update frequency to avoid visual interference and discomfort to the viewer. As the grayscale value becomes lower or When it is closer to the two ends, the human eye is less sensitive to the flicker changes of the brighter or darker picture, so it can accept the lower update frequency of the pixels.

請搭配圖3再參照圖1與圖2，在本實施例中，顯示裝置100可以個別驅動畫素PX操作在不同的頻率上。顯示裝置100可以驅動具有中間範圍灰階值的畫素操作在高頻模態，以維持影像品質。高頻模態例如是大於30Hz以上的範圍。另一方面，顯示裝置100同時可以驅動具有偏低灰階值的畫素操作在低頻模態（在某些實施例中，也可以驅動具有偏高的灰階值的畫素操作在低頻模態），能夠在不影響視覺效果的情況下達到降低能耗的功效。低頻模態例如是大於0Hz到小於等於30Hz的範圍。因為畫素的更新頻率愈低，消耗的能量愈少。如此一來，顯示裝置100有別於現有的其他顯示裝置。現有的顯示裝置呈現靜態畫面時，會通過降低全部畫素的頻率來節省能源。本實施例的顯示裝置100可以根據個別畫素的灰階值來選擇頻率，也就是說可以調整局部畫面的畫素的工作頻率，不需要侷限在靜態畫面，讓節能模式的適用範圍更加靈活、擴大，能夠提供更佳的節能效果。Please refer to FIGS. 1 and 2 again in conjunction with FIG. 3. In this embodiment, the display device 100 can individually drive the pixels PX to operate at different frequencies. The display device 100 can drive pixels with a mid-range grayscale value to operate in a high-frequency mode to maintain image quality. The high-frequency mode is, for example, a range greater than 30 Hz or more. On the other hand, the display device 100 can also drive pixels with low grayscale values to operate in the low frequency mode (in some embodiments, it can also drive pixels with high grayscale values to operate in the low frequency mode. ), can achieve the effect of reducing energy consumption without affecting the visual effect. The low frequency mode is, for example, a range from greater than 0 Hz to less than or equal to 30 Hz. Because the lower the update frequency of pixels, the less energy is consumed. In this way, the display device 100 is different from other existing display devices. When the existing display device presents a static picture, it saves energy by reducing the frequency of all pixels. The display device 100 of this embodiment can select the frequency according to the grayscale value of individual pixels, that is to say, it can adjust the working frequency of the pixels of the partial picture without being limited to the static picture, making the application range of the energy-saving mode more flexible and Expansion can provide better energy-saving effects.

以圖3的考灰階範圍GR1為例，參考灰階範圍GR1是一個連續的灰階範圍，例如是灰階值大於32到小於224的範圍（但不限制）。顯示控制電路120可以將第一灰階值與第二灰階值與參考灰階範圍GR1進行比較以決定第一頻率與第二頻率。當第一灰階值落在參考灰階範圍GR1外，即第一灰階值小於等於32或大於等於224，第一頻率被判斷屬於低頻模態。第一畫素PX1被選擇操作在大於等於10Hz（赫茲）且小於15Hz的範圍，例如是10Hz。當第二灰階值落在參考灰階範圍GR1內，即第二灰階值大於32或小於224，第二頻率被判斷屬於高頻模態，第二頻率會大於第一頻率。第二畫素PX2例如被選擇操作在60Hz。Taking the test gray scale range GR1 of FIG. 3 as an example, the reference gray scale range GR1 is a continuous gray scale range, for example, a range of gray scale values greater than 32 to less than 224 (but not limited). The display control circuit 120 may compare the first gray scale value and the second gray scale value with the reference gray scale range GR1 to determine the first frequency and the second frequency. When the first gray scale value falls outside the reference gray scale range GR1, that is, the first gray scale value is less than or equal to 32 or greater than or equal to 224, the first frequency is judged to belong to the low frequency mode. The first pixel PX1 is selected to operate in a range greater than or equal to 10 Hz (Hertz) and less than 15 Hz, for example, 10 Hz. When the second gray scale value falls within the reference gray scale range GR1, that is, the second gray scale value is greater than 32 or less than 224, the second frequency is judged to belong to the high frequency mode, and the second frequency will be greater than the first frequency. The second pixel PX2 is selected to operate at 60 Hz, for example.

在另一實施例中，以圖3的參考灰階範圍GR2為例，參考灰階範圍GR2是灰階值大於64到小於192的範圍。當第一灰階值落在參考灰階範圍GR2外，第一頻率被決定在大於等於15Hz（赫茲）且小於等於30Hz的範圍內。當第二灰階值落在參考灰階範圍GR2內，第二頻率被設定為大於30Hz以上，例如還是60Hz。In another embodiment, taking the reference gray scale range GR2 of FIG. 3 as an example, the reference gray scale range GR2 is a range of gray scale values greater than 64 to less than 192. When the first gray scale value falls outside the reference gray scale range GR2, the first frequency is determined to be within a range greater than or equal to 15 Hz (hertz) and less than or equal to 30 Hz. When the second gray scale value falls within the reference gray scale range GR2, the second frequency is set to be greater than 30 Hz, for example, still 60 Hz.

特別說明的是，參考灰階範圍可能與低頻模態的範圍有關，也就是說參考灰階範圍的大小會與第一頻率有關。具體來說，當第一頻率被設定愈高時，所對應的參考灰階範圍可能會愈小，符合低頻模態的灰階值範圍變大，而第一頻率被設定愈低時，省電效果愈好，但參考灰階範圍可能會愈大，使得符合低頻模態的灰階值範圍變小。然而，本發明沒有限制低頻模態與高頻模態的範圍。In particular, the reference gray scale range may be related to the range of the low-frequency mode, that is, the size of the reference gray scale range may be related to the first frequency. Specifically, when the first frequency is set higher, the corresponding reference gray scale range may be smaller, and the gray scale value range corresponding to the low frequency mode becomes larger, and when the first frequency is set lower, power saving The effect is better, but the reference gray scale range may be larger, so that the gray scale value range that conforms to the low frequency mode becomes smaller. However, the present invention does not limit the range of the low-frequency mode and the high-frequency mode.

在一實施例中，一個顯示畫素包括紅色畫素、綠色畫素與藍色畫素，如果顯示控制電路120判斷紅色畫素的灰階值落在參考灰階範圍GR2內，而綠色畫素與藍色畫素的灰階值都落在參考灰階範圍GR2外，顯示控制電路120所提供的控制信號CS可以讓紅色畫素繼續操作在60Hz，但降低綠色畫素與藍色畫素的操作頻率，使綠色畫素與藍色畫素操作在15Hz。In one embodiment, a display pixel includes a red pixel, a green pixel, and a blue pixel. If the display control circuit 120 determines that the gray scale value of the red pixel falls within the reference gray scale range GR2, and the green pixel The gray scale values of the blue pixels and the blue pixels fall outside the reference gray scale range GR2. The control signal CS provided by the display control circuit 120 allows the red pixels to continue to operate at 60 Hz, but reduces the difference between the green pixels and the blue pixels. The operating frequency is such that the green and blue pixels operate at 15 Hz.

在另一實施例中，顯示控制電路120除了根據第一灰階值與第二灰階值外，還根據第一畫素PX1與第二畫素PX2的顏色決定第一頻率或第二頻率。In another embodiment, the display control circuit 120 determines the first frequency or the second frequency according to the colors of the first pixel PX1 and the second pixel PX2 in addition to the first grayscale value and the second grayscale value.

舉例來說，顯示控制電路120根據顯示資料DATA獲得畫素PX中的第三畫素PX3的第三灰階值，第三灰階值與第一灰階值相同，但第一畫素PX1與第三畫素PX3的顏色不同，例如第一畫素PX1是紅色畫素，第三畫素PX3是藍色畫素，第三畫素PX3會被驅動操作在第三頻率，但第三頻率不同於第一頻率。顯示控制電路120可以將第三灰階值與參考灰階範圍比較，由於第三灰階值與第一灰階值相同，因此第三頻率可能同樣與第一頻率被判斷屬於低頻模態，與第二頻率不相同，但由於顏色不同，第一頻率可以是15Hz，第三頻率可以是10Hz。在其他實施例中，顯示控制電路120也可以根據畫素不同的顏色而使用不同的參考灰階範圍，本發明對此並不限制。For example, the display control circuit 120 obtains the third grayscale value of the third pixel PX3 in the pixel PX according to the display data DATA. The third grayscale value is the same as the first grayscale value, but the first pixel PX1 is The color of the third pixel PX3 is different. For example, the first pixel PX1 is a red pixel, the third pixel PX3 is a blue pixel, and the third pixel PX3 will be driven to operate at the third frequency, but the third frequency is different In the first frequency. The display control circuit 120 can compare the third gray-scale value with the reference gray-scale range. Since the third gray-scale value is the same as the first gray-scale value, the third frequency may be judged to belong to the low-frequency mode as well as the first frequency. The second frequency is different, but due to different colors, the first frequency can be 15 Hz, and the third frequency can be 10 Hz. In other embodiments, the display control circuit 120 may also use different reference gray scale ranges according to different colors of the pixels, which is not limited by the present invention.

簡言之，即使是擁有相同灰階值的畫素，也有可能因為畫素的顏色不同而被驅動在不同的頻率上。例如，顯示控制電路120可以使眼睛較不敏感的顏色的畫素被驅動在更低的頻率。In short, even pixels with the same grayscale value may be driven at different frequencies because of the different colors of the pixels. For example, the display control circuit 120 can enable pixels of colors that are less sensitive to eyes to be driven at a lower frequency.

在另一實施例中，顯示控制電路120還根據第一畫素PX1與第二畫素PX2的亮度決定第一頻率或第二頻率。舉例來說，顯示控制電路120根據顯示資料DATA獲得畫素PX中的第四畫素PX4的第四灰階值，並且第一畫素PX1、第二畫素PX2與第四畫素PX4具有相同的顏色，例如都是藍色，但第一灰階值、第二灰階值與第四灰階值彼此不同，顯示控制電路120會根據不同的灰階值選擇不同的操作頻率。第四畫素PX4操作在第四頻率，第一頻率、第二頻率與第四頻率也彼此不同。例如第一灰階值、第二灰階值與第四灰階值分別是8、128與32，則第一頻率可以被設定為10Hz，第二頻率可以被設定為60Hz，而第四頻率被設定為15Hz。In another embodiment, the display control circuit 120 also determines the first frequency or the second frequency according to the brightness of the first pixel PX1 and the second pixel PX2. For example, the display control circuit 120 obtains the fourth grayscale value of the fourth pixel PX4 in the pixel PX according to the display data DATA, and the first pixel PX1, the second pixel PX2, and the fourth pixel PX4 have the same The colors of, for example, are all blue, but the first gray scale value, the second gray scale value, and the fourth gray scale value are different from each other. The display control circuit 120 will select different operating frequencies according to different gray scale values. The fourth pixel PX4 operates at a fourth frequency, and the first frequency, the second frequency, and the fourth frequency are also different from each other. For example, if the first gray scale value, the second gray scale value, and the fourth gray scale value are 8, 128, and 32, respectively, the first frequency can be set to 10 Hz, the second frequency can be set to 60 Hz, and the fourth frequency is set to Set to 15Hz.

圖4是依照本發明另一實施例的顯示裝置的裝置示意圖。圖4的顯示裝置400可適用於上述的實施例，顯示裝置400的架構與顯示裝置100相似，但顯示裝置400還包括了環境光感測器410。環境光感測器410電性連接顯示控制電路120，用以檢測環境光並產生環境光感測信號。顯示控制電路120根據環境光感測信號調整第一頻率或第二頻率。在環境光強烈的狀態下（例如艷陽天的戶外），人眼不易察覺畫面閃爍現象，顯示裝置400可以再降低畫素的操作頻率以節約能源。FIG. 4 is a schematic diagram of a display device according to another embodiment of the present invention. The display device 400 of FIG. 4 can be applied to the above-mentioned embodiments. The structure of the display device 400 is similar to that of the display device 100, but the display device 400 also includes an ambient light sensor 410. The ambient light sensor 410 is electrically connected to the display control circuit 120 for detecting ambient light and generating ambient light sensing signals. The display control circuit 120 adjusts the first frequency or the second frequency according to the ambient light sensing signal. In a state of strong ambient light (for example, outdoors in a sunny day), human eyes cannot easily detect the flickering phenomenon, and the display device 400 can further reduce the operating frequency of the pixels to save energy.

在本實施例中，顯示控制電路120根據環境光感測信號先後獲得第一環境光亮度與第二環境光亮度。環境光感測器410檢測到第一環境光亮度的時候，第一畫素PX1操作在第一頻率上，第二畫素PX2操作在第二頻率上。當環境光感測器410檢測到第二環境光亮度且第二環境光亮度大於第一環境光亮度時，顯示控制電路120調降第一頻率或第二頻率。也就是說，當環境光變亮時，顯示控制電路120可以相應地調降畫素的操作頻率，例如把低頻模式的第一頻率從15 Hz降到10 Hz。In this embodiment, the display control circuit 120 sequentially obtains the first ambient light brightness and the second ambient light brightness according to the ambient light sensing signal. When the ambient light sensor 410 detects the brightness of the first ambient light, the first pixel PX1 operates at the first frequency, and the second pixel PX2 operates at the second frequency. When the ambient light sensor 410 detects the second ambient light brightness and the second ambient light brightness is greater than the first ambient light brightness, the display control circuit 120 reduces the first frequency or the second frequency. That is to say, when the ambient light becomes brighter, the display control circuit 120 may correspondingly lower the operating frequency of the pixel, for example, lower the first frequency of the low frequency mode from 15 Hz to 10 Hz.

在另一實施例中，環境光感測器410檢測到環境光的強度大於參考值，例如大於10000 lux（ lm/m2 ，勒克斯），顯示控制電路120可以選擇降低第一頻率或第二頻率的大小，以更進一步節省能源。In another embodiment, when the ambient light sensor 410 detects that the intensity of the ambient light is greater than a reference value, for example, greater than 10000 lux (lm/m 2 , lux), the display control circuit 120 may choose to reduce the first frequency or the second frequency Size to further save energy.

綜上所述，本發明驅動方法適用於顯示裝置，藉由分析顯示資料得到畫面中每個一畫素的灰階值，進一步根據灰階值來調整個別畫素的操作頻率，因此同一個畫面上的畫素的操作頻率可以不相同，以達到更佳節能效果。In summary, the driving method of the present invention is suitable for display devices. The grayscale value of each pixel in the screen is obtained by analyzing the display data, and the operating frequency of individual pixels is further adjusted according to the grayscale value, so the same screen The operating frequency of the above pixels can be different to achieve a better energy saving effect.

雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to those defined by the attached patent application scope.

100、400‧‧‧顯示裝置 110‧‧‧閘極驅動電路 120‧‧‧顯示控制電路 130‧‧‧畫素陣列 200‧‧‧驅動方法 310‧‧‧曲線 410‧‧‧環境光感測器 CS‧‧‧控制信號 DL‧‧‧資料線 DATA‧‧‧顯示資料 GL‧‧‧閘極線 GR1、GR2‧‧‧參考灰階範圍 PX‧‧‧畫素 PX1‧‧‧第一畫素 PX2‧‧‧第二畫素 PX3‧‧‧第三畫素 PX4‧‧‧第四畫素 S210～S230‧‧‧驅動方法的步驟100, 400‧‧‧Display device 110‧‧‧Gate drive circuit 120‧‧‧Display control circuit 130‧‧‧Pixel array 200‧‧‧Drive method 310‧‧‧Curve 410‧‧‧Ambient Light Sensor CS‧‧‧Control signal DL‧‧‧Data line DATA‧‧‧Display data GL‧‧‧Gate line GR1, GR2‧‧‧Reference grayscale range PX‧‧‧Pixel PX1‧‧‧First pixel PX2‧‧‧Second pixel PX3‧‧‧third pixel PX4‧‧‧Fourth pixel S210～S230‧‧‧Steps of driving method

圖1是依照本發明一實施例的顯示裝置的裝置示意圖。 圖2是依照本發明一實施例的顯示裝置的驅動方法的流程圖。 圖3是一種顯示裝置的人眼可接受的灰階值與閃爍值的關係曲線示意圖。 圖4是依照本發明另一實施例的顯示裝置的裝置示意圖。FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention. FIG. 2 is a flowchart of a driving method of a display device according to an embodiment of the invention. FIG. 3 is a schematic diagram of the relationship curve between the grayscale value and the flicker value acceptable to the human eye of a display device. FIG. 4 is a schematic diagram of a display device according to another embodiment of the present invention.

200‧‧‧驅動方法 200‧‧‧Drive method

S210~S230‧‧‧驅動方法的步驟 S210~S230‧‧‧Steps of driving method

Claims (9)

一種顯示裝置的驅動方法，其中該顯示裝置包括多個畫素，該驅動方法包括：獲得該顯示裝置中每一各該畫素的一顯示資料的一灰階值；將該顯示裝置中每一各該畫素的該灰階值與一參考灰階範圍進行比較；以及將該顯示裝置中落在該參考灰階範圍外的每一各該畫素以一第一頻率進行驅動，同時將該顯示裝置中落在該參考灰階範圍內的每一各該畫素以一第二頻率進行驅動，其中該第一頻率與該第二頻率不相同。 A driving method of a display device, wherein the display device includes a plurality of pixels, and the driving method includes: obtaining a grayscale value of a display data of each pixel in the display device; Comparing the gray scale value of each pixel with a reference gray scale range; and each pixel in the display device that falls outside the reference gray scale range is driven at a first frequency, and at the same time Each of the pixels in the display device falling within the reference grayscale range is driven at a second frequency, wherein the first frequency and the second frequency are different. 如申請專利範圍第1項所述的驅動方法，其中該參考灰階範圍為一連續的灰階範圍，其中該參考灰階範圍的大小與該第一頻率有關。 According to the driving method described in item 1 of the scope of patent application, the reference gray scale range is a continuous gray scale range, and the size of the reference gray scale range is related to the first frequency. 如申請專利範圍第1項所述的驅動方法，還包括：根據該顯示裝置中每一各該畫素的顏色決定該第一頻率或該第二頻率。 According to the driving method described in item 1 of the scope of patent application, further comprising: determining the first frequency or the second frequency according to the color of each pixel in the display device. 如申請專利範圍第3項所述的驅動方法，其中根據該顯示裝置中每一各該畫素的顏色決定該第一頻率或該第二頻率的步驟包括：將該顯示裝置中落在該參考灰階範圍外的各個第一畫素以該第一頻率進行驅動，將該顯示裝置中落在該參考灰階範圍外的各 個第二畫素以一第三頻率進行驅動，其中各該第一畫素與各該第二畫素的顏色不同，且該第三頻率不同於該第一頻率。 According to the driving method described in item 3 of the scope of patent application, the step of determining the first frequency or the second frequency according to the color of each pixel in the display device includes: setting the display device in the reference Each first pixel outside the grayscale range is driven at the first frequency, and each pixel in the display device that falls outside the reference grayscale range The second pixels are driven at a third frequency, wherein each of the first pixels and each of the second pixels have different colors, and the third frequency is different from the first frequency. 申請專利範圍第1項所述的驅動方法，還包括：根據各該畫素的亮度決定以該第一頻率或該第二頻率進行驅動。 The driving method described in item 1 of the scope of patent application further includes: deciding to drive at the first frequency or the second frequency according to the brightness of each pixel. 如申請專利範圍第5項所述的驅動方法，其中根據各該畫素的亮度決定以該第一頻率或該第二頻率進行驅動的步驟包括：分別獲得該顯示裝置中一第一畫素、一第二畫素及一第三畫素的一第一灰階值、一第二灰階值及一第三灰階值；以及將該第一畫素、該第二畫素及該第三畫素分別以該第一頻率、該第二頻率及該第三頻率進行驅動，其中，該第一畫素、該第二畫素與該第三畫素的顏色相同但該第一灰階值、該第二灰階值與該第三灰階值彼此不同，且該第一頻率、該第二頻率與該第三頻率也彼此不同。 According to the driving method described in item 5 of the scope of patent application, the step of deciding to drive at the first frequency or the second frequency according to the brightness of each pixel includes: obtaining a first pixel, A first gray scale value, a second gray scale value, and a third gray scale value of a second pixel and a third pixel; and the first pixel, the second pixel, and the third pixel The pixels are driven at the first frequency, the second frequency, and the third frequency, respectively, wherein the first pixel, the second pixel, and the third pixel have the same color but the first grayscale value The second gray scale value and the third gray scale value are different from each other, and the first frequency, the second frequency, and the third frequency are also different from each other. 請專利範圍第1項所述的驅動方法，還包括：通過一環境光感測器以產生一環境光感測信號；以及根據該環境光感測信號調整該第一頻率或該第二頻率。 The driving method described in claim 1, further comprising: generating an ambient light sensing signal through an ambient light sensor; and adjusting the first frequency or the second frequency according to the ambient light sensing signal. 請專利範圍第7項所述的驅動方法，其中根據該環境光感測信號調整該第一頻率或該第二頻率的步驟還包括：根據該環境光感測信號先後獲得一第一環境光亮度與一第二環境光亮度， 其中當該第二環境光亮度大於該第一環境光亮度時，調降該第一頻率或該第二頻率。 Please use the driving method of claim 7, wherein the step of adjusting the first frequency or the second frequency according to the ambient light sensing signal further includes: successively obtaining a first ambient light brightness according to the ambient light sensing signal And a second ambient light brightness, When the brightness of the second ambient light is greater than the brightness of the first ambient light, the first frequency or the second frequency is reduced. 請專利範圍第1項所述的驅動方法，其中各該些畫素包括一發光二極體。Please refer to the driving method described in item 1 of the scope of the patent, wherein each of the pixels includes a light emitting diode.
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