TWI768226B - Display apparatus and display method - Google Patents

Display apparatus and display method Download PDF

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TWI768226B
TWI768226B TW108126627A TW108126627A TWI768226B TW I768226 B TWI768226 B TW I768226B TW 108126627 A TW108126627 A TW 108126627A TW 108126627 A TW108126627 A TW 108126627A TW I768226 B TWI768226 B TW I768226B
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frequency
backlight
display
mode
pulse width
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TW108126627A
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TW202105988A (en
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紀進睿
黃珮雯
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明基電通股份有限公司
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Abstract

A display apparatus and a display method are disclosed. The display apparatus includes a pulse width modulation unit, a backlight unit and a display unit. The pulse width modulation unit is used to generate a pulse width modulation signal. The backlight unit is coupled to the pulse width modulation unit and used to emit a backlight according to the pulse width modulation signal. The display unit is used to receive the backlight and display image. When the display apparatus operates in a first mode, a frequency of the backlight is a first frequency. When the display apparatus starts a second mode, the frequency of the backlight is changed to a second frequency, and the second frequency is different from a shutter frequency of an image capturing apparatus.

Description

顯示裝置及顯示方法 Display device and display method

本發明係與顯示裝置有關，尤其是關於一種具有防偷拍功能的顯示裝置及顯示方法。The present invention is related to a display device, in particular, to a display device and a display method with anti-sudden shooting function.

近年來，隨著顯示技術的快速發展，不同類型的顯示裝置已得到廣泛的應用，但同時也帶來不少的問題與困擾，尤其是關於資訊安全的議題，愈來愈受到重視。In recent years, with the rapid development of display technology, different types of display devices have been widely used, but at the same time, many problems and perplexities have also been brought about. In particular, the issue of information security has received more and more attention.

舉例而言，在某些需要保密或禁止拍攝的場合(例如不公開的秘密會議)中，由於顯示裝置所顯示的資料需要保密，通常會標示“禁止拍攝”的警語或透過人工監控的方式來避免顯示裝置所顯示的資料被有心人士偷拍並洩漏出去。For example, in some occasions that need to be kept confidential or prohibited from taking pictures (such as undisclosed secret meetings), because the information displayed on the display device needs to be kept confidential, a warning message of "No Filming" is usually marked or through manual monitoring. In order to prevent the information displayed on the display device from being secretly photographed and leaked out by people with intentions.

然而，上述方式實際上僅能達到善意提醒的作用，無法完全杜絕有心人士的偷拍行為，導致顯示裝置的資訊安全出現漏洞，亟待改善。However, the above-mentioned methods can only achieve the function of goodwill reminders, and cannot completely prevent the candid photography behaviors of people with intentions, resulting in loopholes in the information security of the display device, which needs to be improved urgently.

有鑑於此，本發明提出一種具有防偷拍功能的顯示裝置及顯示方法，以有效解決先前技術所遭遇到之上述問題。In view of this, the present invention proposes a display device and a display method with an anti-secret photography function, so as to effectively solve the above-mentioned problems encountered in the prior art.

根據本發明之一具體實施例為一種顯示裝置。於此實施例中，顯示裝置包括脈寬調變單元、背光單元及顯示單元。脈寬調變單元用以產生一脈寬調變訊號。背光單元耦接脈寬調變單元，用以根據脈寬調變訊號發出一背光。顯示單元用以接收背光以顯示畫面。當顯示裝置運作於一第一模式時，背光的頻率為一第一頻率。當顯示裝置啟動一第二模式時，背光的頻率改變為一第二頻率，且第二頻率不同於一影像擷取裝置快門頻率。An embodiment according to the present invention is a display device. In this embodiment, the display device includes a pulse width modulation unit, a backlight unit and a display unit. The pulse width modulation unit is used for generating a pulse width modulation signal. The backlight unit is coupled to the pulse width modulation unit for emitting a backlight according to the pulse width modulation signal. The display unit is used for receiving the backlight to display the picture. When the display device operates in a first mode, the frequency of the backlight is a first frequency. When the display device starts a second mode, the frequency of the backlight is changed to a second frequency, and the second frequency is different from the shutter frequency of an image capture device.

於一實施例中，第二模式為防偷拍模式，且第二頻率不同於影像擷取裝置快門頻率的倍數。In one embodiment, the second mode is an anti-secret shooting mode, and the second frequency is different from a multiple of the shutter frequency of the image capture device.

於一實施例中，背光的工作週期係於一預設工作週期範圍內變動，或第二頻率係於一預設頻率範圍內變動。In one embodiment, the duty cycle of the backlight varies within a predetermined duty cycle range, or the second frequency varies within a predetermined frequency range.

於一實施例中，顯示單元具有複數個顯示區域，分別接收背光單元所發出的具有不同頻率的背光而以不同頻率顯示畫面。In one embodiment, the display unit has a plurality of display areas, which respectively receive backlights with different frequencies emitted by the backlight unit to display images at different frequencies.

於一實施例中，顯示單元具有一第一顯示區域及一第二顯示區域。第一顯示區域運作於第一模式且第二顯示區域運作於第二模式。In one embodiment, the display unit has a first display area and a second display area. The first display area operates in the first mode and the second display area operates in the second mode.

於一實施例中，當顯示裝置運作於第二模式時，背光的頻率為第二頻率與第三頻率週期***替或非週期***替，且第三頻率不同於影像擷取裝置快門頻率。In one embodiment, when the display device operates in the second mode, the frequency of the backlight is the second frequency and the third frequency alternating periodically or non-periodically, and the third frequency is different from the shutter frequency of the image capturing device.

根據本發明之另一具體實施例為一種顯示方法。於此實施例中，顯示方法應用於一顯示裝置。顯示裝置包括一顯示單元。顯示方法包括下列步驟：產生一脈寬調變訊號；當顯示裝置運作於一第一模式時，根據脈寬調變訊號發出一背光至顯示單元以顯示畫面，其中背光的頻率為一第一頻率；以及當顯示裝置啟動一第二模式時，改變背光的頻率為一第二頻率，且第二頻率不同於一影像擷取裝置快門頻率。Another embodiment according to the present invention is a display method. In this embodiment, the display method is applied to a display device. The display device includes a display unit. The display method includes the following steps: generating a pulse width modulation signal; when the display device operates in a first mode, sending a backlight to the display unit to display a picture according to the pulse width modulation signal, wherein the frequency of the backlight is a first frequency ; and when the display device starts a second mode, changing the frequency of the backlight to a second frequency, and the second frequency is different from the shutter frequency of an image capture device.

相較於先前技術，當本發明的顯示裝置及顯示方法啟動防偷拍模式時，其背光頻率會被調整為不同於影像擷取裝置的快門頻率(更進一步的，亦可不同於快門頻率及其倍數)，藉以防止影像擷取裝置進行偷拍。再者，防偷拍模式下的背光頻率及工作週期均可在預設範圍內微幅變動，藉以增強防偷拍的效果。此外，本發明的顯示裝置及顯示方法可選擇特定的顯示區域啟動防偷拍模式，藉以增加實際應用時的彈性。Compared with the prior art, when the anti-sudden shooting mode is activated in the display device and the display method of the present invention, the backlight frequency thereof is adjusted to be different from the shutter frequency of the image capture device (further, it can also be different from the shutter frequency and its frequency). multiples), in order to prevent the video capture device from taking candid photos. Furthermore, the backlight frequency and duty cycle in the anti-secret shooting mode can be slightly changed within a preset range, so as to enhance the anti-secret shooting effect. In addition, the display device and the display method of the present invention can select a specific display area to activate the anti-sudden shooting mode, thereby increasing the flexibility in practical application.

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 can be further understood from the following detailed description of the invention and the accompanying drawings.

根據本發明之一具體實施例為一種顯示裝置。請參照圖1，圖1係繪示此實施例中之顯示裝置的功能方塊圖。An embodiment according to the present invention is a display device. Please refer to FIG. 1 , which is a functional block diagram of the display device in this embodiment.

如圖1所示，顯示裝置1包括脈寬調變單元10、背光單元12及顯示單元14。脈寬調變單元10耦接背光單元12。脈寬調變單元10用以產生脈寬調變訊號PWM並輸出脈寬調變訊號PWM至背光單元12。當背光單元12接收到脈寬調變訊號PWM時，背光單元12根據脈寬調變訊號PWM發出背光L至顯示單元14。顯示單元14接收背光L以顯示畫面。As shown in FIG. 1 , the display device 1 includes a pulse width modulation unit 10 , a backlight unit 12 and a display unit 14 . The pulse width modulation unit 10 is coupled to the backlight unit 12 . The pulse width modulation unit 10 is used for generating a pulse width modulation signal PWM and outputting the pulse width modulation signal PWM to the backlight unit 12 . When the backlight unit 12 receives the pulse width modulation signal PWM, the backlight unit 12 sends the backlight L to the display unit 14 according to the pulse width modulation signal PWM. The display unit 14 receives the backlight L to display a picture.

於實際應用中，脈寬調變單元10可以是任何可產生脈寬調變訊號的裝置，例如脈寬調變訊號產生器，但不以此為限；顯示單元14可以是任何類型的顯示面板，例如液晶顯示面板或發光二極體顯示面板，但不以此為限；背光單元12可採用任何類型的背光源，例如採用發光二極體作為背光源，但不以此為限。In practical applications, the PWM unit 10 can be any device that can generate a PWM signal, such as a PWM signal generator, but not limited thereto; the display unit 14 can be any type of display panel , such as a liquid crystal display panel or a light emitting diode display panel, but not limited thereto; the backlight unit 12 can use any type of backlight source, such as a light emitting diode as the backlight source, but not limited thereto.

需說明的是，此實施例中之顯示裝置1除了可運作於傳統的第一模式(例如正常顯示模式)之外，還可運作於第二模式(例如防偷拍模式)，並可於第一模式與第二模式之間進行切換。舉例而言，使用者可透過按壓實體的切換按鍵或觸碰顯示單元14所顯示的虛擬切換按鍵的方式發出切換指令，顯示裝置1即會根據切換指令進行第一模式與第二模式之間的切換。It should be noted that the display device 1 in this embodiment can operate in a second mode (eg, anti-candid mode) in addition to the traditional first mode (eg, normal display mode), and can operate in the first mode switch between the mode and the second mode. For example, the user can issue a switching command by pressing a physical switching button or touching a virtual switching button displayed on the display unit 14, and the display device 1 will perform the switching between the first mode and the second mode according to the switching command. switch.

當顯示裝置1運作於第一模式(例如正常顯示模式)時，背光單元12根據脈寬調變訊號PWM所發出的背光L的頻率為第一頻率。當顯示裝置1啟動第二模式(例如防偷拍模式)時，背光單元12根據脈寬調變訊號PWM所發出的背光L的頻率會由第一頻率變為第二頻率，且第二頻率不同於影像擷取裝置的快門頻率。進一步而言，第二頻率除了不同於影像擷取裝置的快門頻率之外，亦不同於快門頻率的倍數(例如2倍快門頻率、3倍快門頻率、4倍快門頻率等)。接下來，將以第二頻率不同於快門頻率及倍數的情況進行說明。When the display device 1 operates in the first mode (eg, the normal display mode), the frequency of the backlight L emitted by the backlight unit 12 according to the pulse width modulation signal PWM is the first frequency. When the display device 1 activates the second mode (for example, the anti-sneak shooting mode), the frequency of the backlight L emitted by the backlight unit 12 according to the pulse width modulation signal PWM will change from the first frequency to the second frequency, and the second frequency is different from The shutter frequency of the image capture device. Further, in addition to being different from the shutter frequency of the image capturing device, the second frequency is also different from a multiple of the shutter frequency (eg, 2 times the shutter frequency, 3 times the shutter frequency, 4 times the shutter frequency, etc.). Next, the case where the second frequency is different from the shutter frequency and the multiple will be explained.

於實際應用中，影像擷取裝置可以是相機或其他具有影像擷取功能的裝置。假設影像擷取裝置的快門頻率為60Hz，則背光單元12在第二模式下所發出的背光L的第二頻率不同於60Hz及其倍數120Hz、180Hz、240Hz等頻率，而可以是50Hz、65Hz、128Hz、172Hz、230Hz等頻率，但不以此為限。In practical applications, the image capturing device may be a camera or other devices having an image capturing function. Assuming that the shutter frequency of the image capture device is 60Hz, the second frequency of the backlight L emitted by the backlight unit 12 in the second mode is different from 60Hz and its multiples of 120Hz, 180Hz, 240Hz, etc. 128Hz, 172Hz, 230Hz and other frequencies, but not limited to this.

換言之，當顯示裝置1啟動第二模式時，顯示單元14所接收到的背光L的頻率不同於影像擷取裝置的快門頻率及其倍數，使得顯示單元14顯示畫面的背光頻率亦不同於影像擷取裝置的快門頻率及其倍數。因此，當有人欲使用影像擷取裝置偷拍顯示單元14所顯示的畫面時，由於顯示裝置1已啟動第二模式，顯示單元14顯示畫面的背光頻率不同於影像擷取裝置的快門頻率及其倍數，導致影像擷取裝置所拍攝到的影像不夠清晰而難以辨識影像內容，藉以達到防偷拍的效果。In other words, when the display device 1 activates the second mode, the frequency of the backlight L received by the display unit 14 is different from the shutter frequency of the image capture device and its multiples, so that the backlight frequency of the displayed image by the display unit 14 is also different from that of the image capture device. Take the shutter frequency of the device and its multiples. Therefore, when someone wants to use the image capture device to secretly take pictures of the screen displayed by the display unit 14, since the display device 1 has activated the second mode, the backlight frequency of the screen displayed by the display unit 14 is different from the shutter frequency of the image capture device and its multiples , so that the image captured by the image capture device is not clear enough to recognize the image content, so as to achieve the effect of preventing candid photography.

舉例而言，請參照圖2A及圖2B，圖2A及圖2B分別繪示當顯示單元14運作於第一模式及第二模式時所顯示的畫面。For example, please refer to FIG. 2A and FIG. 2B . FIGS. 2A and 2B illustrate the screens displayed when the display unit 14 operates in the first mode and the second mode, respectively.

如圖2A所示，當顯示裝置1運作於第一模式時，由於背光單元12根據脈寬調變訊號PWM所發出的背光L具有的第一頻率與影像擷取裝置的快門頻率或其倍數相同，所以透過影像擷取裝置拍攝顯示單元14顯示畫面可得到相當清晰的影像。當人眼看到影像擷取裝置所拍攝的影像時，均可輕易辨識其影像內容為 “Testing 123”。As shown in FIG. 2A , when the display device 1 operates in the first mode, the first frequency of the backlight L emitted by the backlight unit 12 according to the pulse width modulation signal PWM is the same as the shutter frequency of the image capture device or a multiple thereof. , so a fairly clear image can be obtained by capturing the display screen of the display unit 14 through the image capturing device. When the human eye sees the image captured by the image capture device, the content of the image can be easily identified as "Testing 123".

如圖2B所示，當顯示裝置1啟動第二模式時，由於背光單元12根據脈寬調變訊號PWM所發出的背光L的頻率由原本的第一頻率變為第二頻率，且第二頻率不同於影像擷取裝置的快門頻率及其倍數，所以透過影像擷取裝置拍攝顯示單元14顯示畫面僅能得到不清晰的影像。當人眼看到影像擷取裝置所拍攝的影像時，難以辨識其影像內容為 “Testing 123”，故能真正達到防偷拍的效果。As shown in FIG. 2B , when the display device 1 starts the second mode, the frequency of the backlight L emitted by the backlight unit 12 according to the pulse width modulation signal PWM changes from the original first frequency to the second frequency, and the second frequency Different from the shutter frequency and its multiples of the image capture device, only an unclear image can be obtained by capturing the display screen of the display unit 14 through the image capture device. When the human eye sees the image captured by the image capture device, it is difficult to identify the content of the image as "Testing 123", so it can truly achieve the effect of preventing sneak shots.

於實際應用中，假設在第一模式下，背光單元12根據脈寬調變訊號PWM所發出的背光L具有第一工作週期T。當顯示裝置1啟動第二模式時，背光單元12根據脈寬調變訊號PWM所發出的背光L的工作週期需小於第一工作週期T，例如圖3A至圖3C所繪示的背光L的工作週期分別為0.5T、0.75T及0.25T，但不以此為限。In practical applications, it is assumed that in the first mode, the backlight L emitted by the backlight unit 12 according to the pulse width modulation signal PWM has a first duty cycle T. When the display device 1 starts the second mode, the working cycle of the backlight L sent by the backlight unit 12 according to the pulse width modulation signal PWM needs to be smaller than the first working cycle T, for example, the working cycle of the backlight L shown in FIG. 3A to FIG. 3C The periods are respectively 0.5T, 0.75T and 0.25T, but not limited thereto.

於一實施例中，背光單元12在第二模式下發出的背光L的工作週期可於一預設工作週期範圍(例如±5%)內微幅變動，但不以此為限。若以圖3A所繪示的背光L的工作週期為0.5T為例，背光L的工作週期可微幅變動為0.475T、0.49T、0.51T、0.525T等工作週期，但不以此為限。In one embodiment, the duty cycle of the backlight L emitted by the backlight unit 12 in the second mode may vary slightly within a predetermined duty cycle range (eg, ±5%), but is not limited thereto. If the working cycle of the backlight L shown in FIG. 3A is 0.5T as an example, the working cycle of the backlight L can be slightly changed to 0.475T, 0.49T, 0.51T, 0.525T, etc., but not limited to this. .

藉此，顯示單元14於第二模式下所顯示的畫面會由於背光L的工作週期微幅變動的效果，而使得影像擷取裝置更難以拍攝到清晰的影像，故能增強防偷拍的功效。然而，在實際應用中，背光L的工作週期變動範圍亦不宜過大，以避免使用者觀看顯示單元14時會察覺到背光L有變化。Thereby, the screen displayed by the display unit 14 in the second mode will be more difficult for the image capture device to capture a clear image due to the effect of a slight change in the duty cycle of the backlight L, thereby enhancing the anti-secret shooting effect. However, in practical applications, the variation range of the duty cycle of the backlight L should not be too large, so as to prevent the user from perceiving a change in the backlight L when viewing the display unit 14 .

於另一實施例中，背光單元12在第二模式下發出的背光L的第二頻率亦可於一預設頻率範圍(例如±5%)內微幅變動，但不以此為限。假設背光L的第二頻率為50Hz，則第二頻率可微幅變動為47.5Hz、48.7Hz、49.5Hz、51Hz、52.5Hz等頻率，但不以此為限。In another embodiment, the second frequency of the backlight L emitted by the backlight unit 12 in the second mode may also vary slightly within a predetermined frequency range (eg, ±5%), but not limited thereto. Assuming that the second frequency of the backlight L is 50 Hz, the second frequency can be slightly changed to frequencies such as 47.5 Hz, 48.7 Hz, 49.5 Hz, 51 Hz, 52.5 Hz, but not limited thereto.

藉此，顯示單元14於第二模式下所顯示的畫面會由於背光L的頻率微幅變動的效果，而使得影像擷取裝置更難以拍攝到清晰的影像，故能增強防偷拍的功效。然而，在實際應用中，背光L的頻率變動範圍亦不宜過大，以避免使用者觀看顯示單元14時會察覺到背光L有變化。In this way, the screen displayed by the display unit 14 in the second mode will be more difficult for the image capture device to capture a clear image due to the effect of the slight change in the frequency of the backlight L, thus enhancing the anti-secret shooting effect. However, in practical applications, the frequency variation range of the backlight L should not be too large, so as to prevent the user from perceiving a change in the backlight L when viewing the display unit 14 .

需說明的是，上述實施例係以顯示單元14僅具有單一顯示區域的情況進行說明。然而，顯示單元14實際上亦可同時具有複數個顯示區域，並且該複數個顯示區域可選擇性地分別運作於不同模式(例如第一模式及第二模式)下，藉以分別接收背光單元12所發出的具有不同頻率(例如第一頻率及第二頻率)的背光L以顯示畫面。It should be noted that, the above embodiments are described in the case that the display unit 14 has only a single display area. However, the display unit 14 can actually have a plurality of display areas at the same time, and the plurality of display areas can be selectively operated in different modes (eg, the first mode and the second mode), respectively, so as to receive the signals from the backlight unit 12 respectively. The backlight L with different frequencies (eg, the first frequency and the second frequency) is emitted to display the picture.

於實際應用中，顯示單元14所具有的該複數個顯示區域之形狀、區域分法及排列型式並無特定的限制，端視實際需求而定。舉例而言，該複數個顯示區域可以是矩陣排列、水平條狀排列或垂直條狀排列，但不以此為限。In practical applications, there are no specific restrictions on the shape, area division and arrangement type of the plurality of display areas of the display unit 14, and it depends on actual requirements. For example, the plurality of display areas may be arranged in a matrix, in a horizontal stripe or in a vertical stripe, but not limited thereto.

需說明的是，當背光單元12採用發光二極體作為背光源時，由於發光二極體背光技術可分為直下式(Direct Back-Lit)及側照式(Edge LED Back-Lit)兩種，因此，當背光單元12採用直下式發光二極體背光技術或側照式發光二極體背光技術時，顯示單元14的該複數個顯示區域的區域分法及排列型式亦會有所不同。It should be noted that when the backlight unit 12 uses light-emitting diodes as the backlight source, the light-emitting diode backlight technology can be divided into two types: Direct Back-Lit and Edge LED Back-Lit. Therefore, when the backlight unit 12 adopts the direct-lit LED backlight technology or the side-illuminated LED backlight technology, the area division and arrangement of the plurality of display areas of the display unit 14 will also be different.

如圖4所示，假設顯示單元14具有第一顯示區域R1~第四顯示區域R4，且第一顯示區域R1~第四顯示區域R4係以(2*2)矩陣排列，但不以此為限。於此實施例中，第一顯示區域R1~第四顯示區域R4中之每一顯示區域均可根據實際需求選擇性地運作於第一模式或第二模式下。As shown in FIG. 4 , it is assumed that the display unit 14 has a first display area R1 to a fourth display area R4, and the first display area R1 to the fourth display area R4 are arranged in a (2*2) matrix, but this is not the case limit. In this embodiment, each display area in the first display area R1 to the fourth display area R4 can selectively operate in the first mode or the second mode according to actual requirements.

舉例而言，如圖5所示，若第一顯示區域R1~第四顯示區域R4中僅有第二顯示區域R2所顯示的“EFGH”需防止被偷拍，至於第一顯示區域R1所顯示的“ABCD”、第三顯示區域R3所顯示的“IJKL”及第四顯示區域R4所顯示的“MNOP”則不需防止被偷拍，則維持第一顯示區域R1、第三顯示區域R3及第四顯示區域R4運作於第一模式下，並將第二顯示區域R2切換至第二模式。For example, as shown in FIG. 5 , if only the “EFGH” displayed in the second display area R2 in the first display area R1 to the fourth display area R4 needs to be prevented from being photographed secretly, as for the images displayed in the first display area R1 "ABCD", "IJKL" displayed in the third display area R3 and "MNOP" displayed in the fourth display area R4 do not need to be protected from being photographed secretly, so the first display area R1, the third display area R3 and the fourth display area R1 are maintained. The display area R4 operates in the first mode, and switches the second display area R2 to the second mode.

運作於第一模式下的第一顯示區域R1、第三顯示區域R3及第四顯示區域R4所接收到的背光L具有第一頻率，且第一頻率與影像擷取裝置的快門頻率或其倍數相同，使得影像擷取裝置能夠拍攝到第一顯示區域R1、第三顯示區域R3及第四顯示區域R4的清晰影像，故人眼可辨識出第一顯示區域R1所顯示的“ABCD”、第三顯示區域R3所顯示的“IJKL”及第四顯示區域R4所顯示的“MNOP”；運作於第二模式下的第二顯示區域R2所接收到的背光L具有第二頻率，且第二頻率不同於影像擷取裝置的快門頻率及其倍數，使得影像擷取裝置難以拍攝到第二顯示區域R2的清晰影像，故人眼觀察影像擷取裝置所拍攝到的影像時，無法辨識出第二顯示區域R2所顯示的“EFGH”，藉以達到選擇部分的顯示區域防偷拍的效果。The backlight L received by the first display area R1 , the third display area R3 and the fourth display area R4 operating in the first mode has a first frequency, and the first frequency is the shutter frequency of the image capture device or a multiple thereof In the same way, the image capture device can capture clear images of the first display area R1, the third display area R3 and the fourth display area R4, so the human eye can recognize the “ABCD” displayed in the first display area R1, the third display area R3 and the third display area R4. "IJKL" displayed in the display area R3 and "MNOP" displayed in the fourth display area R4; the backlight L received by the second display area R2 operating in the second mode has a second frequency, and the second frequency is different Due to the shutter frequency of the image capture device and its multiples, it is difficult for the image capture device to capture a clear image of the second display area R2, so when the human eye observes the image captured by the image capture device, the second display area cannot be recognized. The "EFGH" displayed by R2 can achieve the effect of preventing candid photography in the display area of the selected part.

需說明的是，上述實施例係以背光單元12在第二模式下所發出的背光L僅具有單一種頻率(亦即第二頻率)的情況進行說明。然而，於實際應用中，背光單元12在第二模式下所發出的背光L的頻率亦可以是複數種頻率週期***替或非週期***替。It should be noted that, the above embodiments are described in the case that the backlight L emitted by the backlight unit 12 in the second mode only has a single frequency (ie, the second frequency). However, in practical applications, the frequency of the backlight L emitted by the backlight unit 12 in the second mode may also alternate periodically or aperiodically with a plurality of frequencies.

舉例而言，當顯示裝置1運作於第二模式時，背光單元12所發出的背光L的頻率可以是第二頻率(例如55Hz)與第三頻率(例如65Hz)週期***替或非週期***替，且第二頻率(例如55Hz)與第三頻率(例如65Hz)均不同於影像擷取裝置的快門頻率(例如60Hz)及其倍數。For example, when the display device 1 operates in the second mode, the frequency of the backlight L emitted by the backlight unit 12 may be the second frequency (eg 55 Hz) and the third frequency (eg 65 Hz) alternating periodically or aperiodically , and both the second frequency (eg 55 Hz) and the third frequency (eg 65 Hz) are different from the shutter frequency (eg 60 Hz) of the image capture device and its multiples.

藉此，顯示單元14在第二模式下所顯示的畫面會因為不同於影像擷取裝置的快門頻率(例如60Hz)及其倍數的複數種背光頻率(例如55Hz及65Hz)週期***替或非週期***替的效果，而使得影像擷取裝置拍攝顯示單元14的顯示畫面時更難以得到清晰的影像，故能達到更好的防偷拍效果。Therefore, the screen displayed by the display unit 14 in the second mode will alternate periodically or non-periodically due to a plurality of backlight frequencies (eg, 55Hz and 65Hz) that are different from the shutter frequency (eg, 60Hz) of the image capture device and its multiples. It is more difficult to obtain a clear image when the image capturing device captures the display screen of the display unit 14 , so that a better anti-sudden shooting effect can be achieved.

於另一實施例中，假設圖4中之第二顯示區域R2及第三顯示區域R3運作於第一模式下且第一顯示區域R1及第四顯示區域R4運作於第二模式下。運作於第一模式下的第二顯示區域R2及第三顯示區域R3所接收的背光L的頻率為第一頻率(例如60Hz)，且第一頻率與影像擷取裝置的快門頻率(例如60Hz)或其倍數相同。In another embodiment, it is assumed that the second display area R2 and the third display area R3 in FIG. 4 operate in the first mode and the first display area R1 and the fourth display area R4 operate in the second mode. The frequency of the backlight L received by the second display area R2 and the third display area R3 operating in the first mode is the first frequency (for example, 60 Hz), and the first frequency is the shutter frequency of the image capture device (for example, 60 Hz) or its multiples are the same.

至於運作於第二模式下的第一顯示區域R1所接收的背光L的頻率為第二頻率(例如55Hz)與第三頻率(例如65Hz)週期***替或非週期***替，且第二頻率與第三頻率均不同於影像擷取裝置的快門頻率(例如60Hz)及其倍數；運作於第二模式下的第四顯示區域R4所接收的背光L的頻率為第四頻率(例如50Hz)與第五頻率(例如70Hz)週期***替或非週期***替，且第四頻率與第五頻率均不同於影像擷取裝置的快門頻率(例如60Hz)及其倍數。As for the frequency of the backlight L received by the first display region R1 operating in the second mode, the second frequency (eg 55 Hz) and the third frequency (eg 65 Hz) alternate periodically or non-periodically, and the second frequency and The third frequency is different from the shutter frequency (eg 60Hz) of the image capture device and its multiples; the frequency of the backlight L received by the fourth display area R4 operating in the second mode is the fourth frequency (eg 50Hz) and the The five frequencies (eg, 70 Hz) alternate periodically or non-periodically, and the fourth frequency and the fifth frequency are both different from the shutter frequency (eg, 60 Hz) of the image capture device and its multiples.

由上述可知：顯示單元14中運作於第二模式的不同顯示區域(亦即第一顯示區域R1及第四顯示區域R4)可分別接收具有不同頻率(亦即第二頻率~第五頻率)的背光L，其中該些頻率均不同於影像擷取裝置的快門頻率及其倍數，並且該些頻率可彼此週期***替或非週期***替。From the above, it can be seen that different display regions (ie, the first display region R1 and the fourth display region R4 ) operating in the second mode in the display unit 14 can receive signals with different frequencies (ie, the second frequency to the fifth frequency) respectively. The backlight L, wherein the frequencies are different from the shutter frequency of the image capture device and its multiples, and the frequencies may alternate with each other periodically or non-periodically.

藉此，當影像擷取裝置拍攝顯示單元14所顯示的畫面時，僅有運作於第一模式下的顯示區域(亦即第二顯示區域R2及第三顯示區域R3)會被拍攝到清晰的影像，至於運作於第二模式下的顯示區域(亦即第一顯示區域R1及第四顯示區域R4)則難以被拍攝到清晰的影像，故無法辨識其影像內容，使得顯示單元14中之欲保密的顯示區域(亦即第一顯示區域R1及第四顯示區域R4)能夠達到良好的防偷拍效果。Therefore, when the image capture device captures the image displayed by the display unit 14 , only the display area (ie, the second display area R2 and the third display area R3 ) operating in the first mode will be clearly photographed. As for the display area operating in the second mode (ie, the first display area R1 and the fourth display area R4), it is difficult to capture a clear image, so the image content cannot be recognized, so that the desired content in the display unit 14 The confidential display areas (ie, the first display area R1 and the fourth display area R4 ) can achieve a good anti-sudden shooting effect.

根據本發明之另一具體實施例為一種顯示方法。於此實施例中，顯示方法係應用於顯示裝置，且顯示裝置包括顯示單元，例如顯示面板，但不以此為限。Another embodiment according to the present invention is a display method. In this embodiment, the display method is applied to a display device, and the display device includes a display unit, such as a display panel, but is not limited thereto.

請參照圖6，圖6係繪示此實施例中之顯示方法的流程圖。如圖6所示，顯示方法包括下列步驟：Please refer to FIG. 6 , which is a flowchart illustrating a display method in this embodiment. As shown in Figure 6, the display method includes the following steps:

步驟S10：產生脈寬調變訊號；Step S10: generating a pulse width modulation signal;

步驟S12：當顯示裝置運作於第一模式(例如正常顯示模式)時，根據脈寬調變訊號發出背光至顯示單元以顯示畫面，其中背光的頻率為第一頻率；以及Step S12 : when the display device operates in the first mode (eg, the normal display mode), send out the backlight to the display unit according to the PWM signal to display the image, wherein the frequency of the backlight is the first frequency; and

步驟S14：當顯示裝置啟動第二模式(例如防偷拍模式)時，改變背光的頻率為第二頻率，且第二頻率不同於影像擷取裝置快門頻率。Step S14 : when the display device activates the second mode (eg, the anti-sneak shooting mode), the frequency of the backlight is changed to the second frequency, and the second frequency is different from the shutter frequency of the image capture device.

於一實施例中，第二頻率不同於影像擷取裝置快門頻率及其倍數。In one embodiment, the second frequency is different from the shutter frequency of the image capture device and its multiples.

於實際應用中，第二頻率不同於影像擷取裝置快門頻率的倍數且第二頻率可於預設頻率範圍內變動；背光的工作週期可於預設工作週期範圍內變動。顯示單元可具有複數個顯示區域，分別接收背光單元所發出的具有不同頻率的背光而以不同背光頻率顯示畫面。舉例而言，顯示單元可具有第一顯示區域及第二顯示區域，且第一顯示區域運作於第一模式且第二顯示區域運作於第二模式，但不以此為限。In practical applications, the second frequency is different from a multiple of the shutter frequency of the image capture device and the second frequency can be changed within a predetermined frequency range; the working cycle of the backlight can be changed within the predetermined working cycle range. The display unit may have a plurality of display areas, respectively receiving backlights with different frequencies emitted by the backlight unit to display images with different backlight frequencies. For example, the display unit may have a first display area and a second display area, and the first display area operates in the first mode and the second display area operates in the second mode, but not limited thereto.

此外，當顯示裝置運作於第二模式時，背光的頻率亦可以是由第二頻率與第三頻率週期***替或非週期***替，且第二頻率與第三頻率均不同於影像擷取裝置的快門頻率。In addition, when the display device operates in the second mode, the frequency of the backlight can also be alternated periodically or non-periodically by the second frequency and the third frequency, and both the second frequency and the third frequency are different from the image capturing device shutter frequency.

相較於先前技術，當本發明的顯示裝置及顯示方法啟動防偷拍模式時，其背光頻率會被調整為不同於影像擷取裝置的快門頻率及其倍數，藉以防止影像擷取裝置進行偷拍。再者，防偷拍模式下的背光頻率及工作週期均可在預設範圍內微幅變動，藉以增強防偷拍的效果。此外，本發明的顯示裝置及顯示方法可選擇特定的顯示區域啟動防偷拍模式，藉以增加實際應用時的彈性。Compared with the prior art, when the anti-sudden shooting mode is activated in the display device and the display method of the present invention, the backlight frequency is adjusted to be different from the shutter frequency and its multiple of the image capture device, thereby preventing the image capture device from taking candid photos. Furthermore, the backlight frequency and duty cycle in the anti-secret shooting mode can be slightly changed within a preset range, so as to enhance the anti-secret shooting effect. In addition, the display device and the display method of the present invention can select a specific display area to activate the anti-sudden shooting mode, thereby increasing the flexibility in practical application.

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。Through the detailed description of the preferred embodiments above, it is hoped that the features and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various modifications and equivalent arrangements within the scope of the claimed scope of the present invention.

1:顯示裝置 10:脈寬調變單元 12:背光單元 14:顯示單元 PWM:脈寬調變訊號 L:背光 T:第一工作週期 R1~R4:第一顯示區域~第四顯示區域 S10~S14:步驟1: Display device 10: PWM unit 12: Backlight unit 14: Display unit PWM: Pulse Width Modulation Signal L: Backlight T: The first duty cycle R1~R4: The first display area ~ the fourth display area S10~S14: Steps

本發明所附圖式說明如下： 圖1係繪示本發明之一較佳具體實施例中之顯示裝置的功能方塊圖。 圖2A及圖2B係分別繪示當顯示單元運作於第一模式(例如正常顯示模式)及第二模式(例如防偷拍模式)時所顯示的畫面。 圖3A至圖3C係分別繪示運作於第二模式(例如防偷拍模式)時之背光具有不同工作週期的示意圖。 圖4係繪示顯示單元具有複數個顯示區域的示意圖。 圖5係繪示僅有部分的顯示區域運作於第二模式(例如防偷拍模式)的示意圖。 圖6係繪示本發明之另一較佳具體實施例中之顯示方法的流程圖。The accompanying drawings of the present invention are described as follows: FIG. 1 is a functional block diagram of a display device in a preferred embodiment of the present invention. FIG. 2A and FIG. 2B respectively illustrate images displayed when the display unit operates in a first mode (eg, a normal display mode) and a second mode (eg, an anti-sneak shooting mode). 3A to FIG. 3C are schematic diagrams respectively illustrating that the backlight has different duty cycles when operating in a second mode (eg, an anti-spy camera mode). FIG. 4 is a schematic diagram illustrating a display unit having a plurality of display areas. FIG. 5 is a schematic diagram illustrating that only part of the display area operates in the second mode (eg, the anti-sudden shooting mode). FIG. 6 is a flowchart illustrating a display method in another preferred embodiment of the present invention.

S10~S14:步驟 S10~S14: Steps

Claims (11)

一種顯示裝置，包括：一脈寬調變單元，用以產生一脈寬調變訊號；一背光單元，耦接該脈寬調變單元，用以根據該脈寬調變訊號發出一背光；以及一顯示單元，用以接收該背光以顯示畫面；其中，當該顯示裝置運作於一第一模式時，該背光的頻率為一第一頻率；當該顯示裝置啟動一第二模式時，該背光的頻率改變為一第二頻率，且該第二頻率不同於一影像擷取裝置快門頻率，該第二模式為一防偷拍模式，且該第二頻率不同於該影像擷取裝置快門頻率的倍數。 A display device, comprising: a pulse width modulation unit for generating a pulse width modulation signal; a backlight unit coupled to the pulse width modulation unit for issuing a backlight according to the pulse width modulation signal; and a display unit for receiving the backlight to display images; wherein, when the display device operates in a first mode, the frequency of the backlight is a first frequency; when the display device starts a second mode, the backlight The frequency is changed to a second frequency, and the second frequency is different from the shutter frequency of an image capture device, the second mode is an anti-candid mode, and the second frequency is different from the multiple of the shutter frequency of the image capture device . 如申請專利範圍第1項所述之顯示裝置，其中當該顯示裝置運作於該第二模式時，該背光的頻率為該第二頻率與一第三頻率之週期***替或非週期***替，且該第三頻率不同於該影像擷取裝置快門頻率。 The display device as described in claim 1, wherein when the display device operates in the second mode, the frequency of the backlight is a periodic alternation or aperiodic alternation of the second frequency and a third frequency, And the third frequency is different from the shutter frequency of the image capture device. 如申請專利範圍第1項所述之顯示裝置，其中該背光的工作週期係於一預設工作週期範圍內變動，或該第二頻率係於一預設頻率範圍內變動。 The display device of claim 1, wherein the duty cycle of the backlight varies within a predetermined duty cycle range, or the second frequency varies within a predetermined frequency range. 一種顯示裝置，包括：一脈寬調變單元，用以產生一脈寬調變訊號；一背光單元，耦接該脈寬調變單元，用以根據該脈寬調變訊號發出一背光；以及一顯示單元，用以接收該背光以顯示畫面；其中，當該顯示裝置運作於一第一模式時，該背光的頻率為一第一頻率； 當該顯示裝置啟動一第二模式時，該背光的頻率改變為一第二頻率，且該第二頻率不同於一影像擷取裝置快門頻率，該背光的工作週期係於一預設工作週期範圍內變動，或該第二頻率係於一預設頻率範圍內變動。 A display device, comprising: a pulse width modulation unit for generating a pulse width modulation signal; a backlight unit coupled to the pulse width modulation unit for issuing a backlight according to the pulse width modulation signal; and a display unit for receiving the backlight to display images; wherein, when the display device operates in a first mode, the frequency of the backlight is a first frequency; When the display device starts a second mode, the frequency of the backlight is changed to a second frequency, and the second frequency is different from the shutter frequency of an image capture device, and the duty cycle of the backlight is within a predetermined duty cycle range within a predetermined frequency range, or the second frequency varies within a predetermined frequency range. 如申請專利範圍第4項所述之顯示裝置，其中當該顯示裝置運作於該第二模式時，該背光的頻率為該第二頻率與一第三頻率之週期***替或非週期***替，且該第三頻率不同於該影像擷取裝置快門頻率。 The display device as described in claim 4, wherein when the display device operates in the second mode, the frequency of the backlight is a periodic alternation or aperiodic alternation of the second frequency and a third frequency, And the third frequency is different from the shutter frequency of the image capture device. 一種顯示裝置，包括：一脈寬調變單元，用以產生一脈寬調變訊號；一背光單元，耦接該脈寬調變單元，用以根據該脈寬調變訊號發出一背光；以及一顯示單元，用以接收該背光以顯示畫面；其中，當該顯示裝置運作於一第一模式時，該背光的頻率為一第一頻率；當該顯示裝置啟動一第二模式時，該背光的頻率改變為一第二頻率，且該第二頻率不同於一影像擷取裝置快門頻率，當該顯示裝置運作於該第二模式時，該背光的頻率為該第二頻率與一第三頻率之週期***替或非週期***替，且該第三頻率不同於該影像擷取裝置快門頻率。 A display device, comprising: a pulse width modulation unit for generating a pulse width modulation signal; a backlight unit coupled to the pulse width modulation unit for issuing a backlight according to the pulse width modulation signal; and a display unit for receiving the backlight to display images; wherein, when the display device operates in a first mode, the frequency of the backlight is a first frequency; when the display device starts a second mode, the backlight The frequency of the backlight is changed to a second frequency, and the second frequency is different from the shutter frequency of an image capture device. When the display device operates in the second mode, the frequency of the backlight is the second frequency and a third frequency and the third frequency is different from the shutter frequency of the image capture device. 一種顯示方法，應用於一顯示裝置，該顯示裝置包括一顯示單元，該顯示方法包括下列步驟：產生一脈寬調變訊號；當該顯示裝置運作於一第一模式時，根據該脈寬調變訊號發出一背光至該顯示單元以顯示畫面，其中該背光的頻率為一第一頻率；以及 當該顯示裝置啟動一第二模式時，改變該背光的頻率為一第二頻率，且該第二頻率不同於一影像擷取裝置快門頻率；其中，該背光的工作週期係於一預設工作週期範圍內變動，或該第二頻率係於一預設頻率範圍內變動。 A display method is applied to a display device, the display device includes a display unit, the display method includes the following steps: generating a pulse width modulation signal; when the display device operates in a first mode, according to the pulse width modulation signal The variable signal sends a backlight to the display unit to display the picture, wherein the frequency of the backlight is a first frequency; and When the display device starts a second mode, the frequency of the backlight is changed to a second frequency, and the second frequency is different from the shutter frequency of an image capture device; wherein, the working cycle of the backlight is based on a preset operation range within a period, or the second frequency varies within a predetermined frequency range. 如申請專利範圍第7項所述之顯示方法，其中該第二模式為一防偷拍模式，且該第二頻率不同於該影像擷取裝置快門頻率的倍數。 The display method as described in claim 7, wherein the second mode is an anti-sudden shooting mode, and the second frequency is different from a multiple of the shutter frequency of the image capture device. 如申請專利範圍第7項所述之顯示方法，其中當該顯示裝置運作於該第二模式時，該背光的頻率為該第二頻率與一第三頻率之週期***替或非週期***替，且該第三頻率不同於該影像擷取裝置快門頻率。 The display method as described in claim 7, wherein when the display device operates in the second mode, the frequency of the backlight is a periodic alternation or aperiodic alternation of the second frequency and a third frequency, And the third frequency is different from the shutter frequency of the image capture device. 如申請專利範圍第7項所述之顯示方法，其中該顯示單元具有複數個顯示區域，該複數個顯示區域分別接收具有不同頻率的該背光而以不同頻率顯示畫面。 The display method according to claim 7, wherein the display unit has a plurality of display areas, and the plurality of display areas respectively receive the backlight with different frequencies to display images at different frequencies. 如申請專利範圍第7項所述之顯示方法，其中該顯示單元具有一第一顯示區域及一第二顯示區域，該第一顯示區域運作於該第一模式且該第二顯示區域運作於該第二模式。 The display method as described in claim 7, wherein the display unit has a first display area and a second display area, the first display area operates in the first mode and the second display area operates in the second mode.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106407827A (en) * 2016-11-24 2017-02-15 合肥工业大学 Frequency difference-based screen secret photography prevention device
CN107644623A (en) * 2016-07-20 2018-01-30 京东方科技集团股份有限公司 A kind of backlight module, display device and Anti-sneak-shooting system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107644623A (en) * 2016-07-20 2018-01-30 京东方科技集团股份有限公司 A kind of backlight module, display device and Anti-sneak-shooting system
CN106407827A (en) * 2016-11-24 2017-02-15 合肥工业大学 Frequency difference-based screen secret photography prevention device

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