TWI447699B - Display apparatus with circuit protection module and protection method thereof - Google Patents
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Description
本發明係關於一種具有電路保護模組之顯示裝置及其保護方法。The invention relates to a display device with a circuit protection module and a protection method thereof.
一般來說，液晶顯示裝置包含一背光模組、一液晶顯示面板與一電源供應模組，由於，液晶顯示面板本身不發光，因此背光模組之功能即在於提供充足的亮度與均勻的光源，使得液晶顯示面板得以顯示影像。此外，電源供應模組則用以提供背光模組產生光源所需之電源。其中，在較大尺寸之液晶顯示裝置中，主要是以升降壓轉換器(Boost-Buck Converter)或升壓轉換器(Boost Converter)作為電源供應模組。Generally, a liquid crystal display device includes a backlight module, a liquid crystal display panel and a power supply module. Since the liquid crystal display panel itself does not emit light, the function of the backlight module is to provide sufficient brightness and a uniform light source. Allows the liquid crystal display panel to display images. In addition, the power supply module is used to provide the power required by the backlight module to generate the light source. Among them, in a larger-sized liquid crystal display device, a Boost-Buck Converter or a Boost Converter is mainly used as a power supply module.
如圖1A所示，若背光模組發生開路的狀況時，電源供應模組，例如是升降壓轉換器或升壓轉換器，將因其內部之切換訊號產生元件所輸出的切換訊號(脈衝寬度變調訊號)的導通時間增加，而使得電源供應模組的輸出電壓持續上升，最終將導致電源供應模組內部的輸出電容、二極體或切換單元發生過載，進而損毀。As shown in FIG. 1A, when the backlight module is in an open state, the power supply module, such as a buck-boost converter or a boost converter, will switch the signal (pulse width) output by the internal switching signal generating component. The on-time of the variable-tone signal increases, and the output voltage of the power supply module continues to rise, which eventually causes the output capacitor, the diode or the switching unit inside the power supply module to be overloaded and damaged.
為了提供使用者及電子裝置一個安全的操作環境並符合安規，有業者提出了一種電路保護模組1，請參照圖1B所示，習知的電路保護模組1係用以確保負載L發生短路或過電流的狀況時，限制電源供應模組P的輸出功率，以避免電源供應模組P及與其連接之負載L受到永久性的損害。習知的電路保護模組1是直接採用一齊納二極體(Zener diode)與負載L並聯連接。當電源供應模組P所提供至負載L之電壓未超過電路保護模組1的崩潰電壓時，電路保護模組1將不發生作用。當負載L發生故障，而使得電源供應模組P輸出至負載之電壓超過電路保護模組1的崩潰電壓時，電路保護模組1將被導通，並限制電源供應模組P的輸出電壓，不再繼續上升，以避免電源供應模組P之內部元件的損壞，並確保使用者的安全。In order to provide a safe operating environment for the user and the electronic device and to comply with the safety regulations, a circuit protection module 1 has been proposed. Referring to FIG. 1B, the conventional circuit protection module 1 is used to ensure that the load L is short-circuited. In the case of an overcurrent condition, the output power of the power supply module P is limited to prevent the power supply module P and the load L connected thereto from being permanently damaged. The conventional circuit protection module 1 is directly connected in parallel with the load L by a Zener diode. When the voltage supplied from the power supply module P to the load L does not exceed the breakdown voltage of the circuit protection module 1, the circuit protection module 1 will not function. When the load L fails, and the voltage output from the power supply module P to the load exceeds the breakdown voltage of the circuit protection module 1, the circuit protection module 1 will be turned on, and the output voltage of the power supply module P is limited, Continue to rise again to avoid damage to the internal components of the power supply module P and to ensure the safety of the user.
雖然，習知的電路保護模組1具有結構簡單的優點，但電路保護模組1僅是限制電源供應模組P的輸出電壓不再繼續上升，因而當流過電路保護模組1之總電流過大，將造成電路保護模組1功率超載，使得電路保護模組1立即被燒毀，並造成電源供應模組P內部的元件損壞。Although the conventional circuit protection module 1 has the advantages of simple structure, the circuit protection module 1 only limits the output voltage of the power supply module P to no longer continue to rise, and thus the total current flowing through the circuit protection module 1 If it is too large, the circuit protection module 1 will be overloaded, so that the circuit protection module 1 is immediately burned and the components inside the power supply module P are damaged.
因此，如何提供一種具有電路保護模組之顯示裝置及其保護方法，使其能夠調整電源供應模組的輸出電壓，以減低元件的損壞，並提升可靠度與可應用性，已成為重要課題之一。Therefore, how to provide a display device with a circuit protection module and a protection method thereof, which can adjust the output voltage of the power supply module to reduce component damage, improve reliability and applicability, has become an important issue. One.
有鑑於上述課題，本發明之目的為提供一種能夠調整電源供應模組的輸出電壓，以減低元件的損壞，並提升可靠度與可應用性的具有電路保護模組之顯示裝置及其保護方法。In view of the above problems, an object of the present invention is to provide a display device having a circuit protection module capable of adjusting an output voltage of a power supply module to reduce damage of components, and improving reliability and applicability, and a protection method thereof.
為達上述目的，依據本發明之一種顯示裝置包括一顯示面板、一背光模組、一電路保護模組及一電源供應模組。背光模組具有一發光單元並提供顯示面板一光源。電路保護模組與發光單元電性連接，並具有一偵測單元及一控制單元。電源供應模組與背光模組電性連接，並提供一輸出電壓至發光單元。當電源供應模組之輸出電壓大於一過載電壓值，偵測單元輸出一偵測訊號。控制模組依據偵測訊號調整電源供應模組之輸出電壓，使調整後之輸出電壓低於過載電壓值。To achieve the above objective, a display device according to the present invention includes a display panel, a backlight module, a circuit protection module, and a power supply module. The backlight module has a light emitting unit and provides a display panel and a light source. The circuit protection module is electrically connected to the light emitting unit, and has a detecting unit and a control unit. The power supply module is electrically connected to the backlight module and provides an output voltage to the light emitting unit. When the output voltage of the power supply module is greater than an overload voltage value, the detecting unit outputs a detection signal. The control module adjusts the output voltage of the power supply module according to the detection signal, so that the adjusted output voltage is lower than the overload voltage value.
在本發明之一實施例中，偵測單元包括一電壓限制元件、一第一阻抗元件及一第一切換元件。電壓限制元件與電源供應模組電性連接。第一阻抗元件之一端與電壓限制元件電性連接，其另一端與控制單元電性連接。第一切換元件與控制單元電性連接。In an embodiment of the invention, the detecting unit includes a voltage limiting component, a first impedance component, and a first switching component. The voltage limiting component is electrically connected to the power supply module. One end of the first impedance element is electrically connected to the voltage limiting element, and the other end thereof is electrically connected to the control unit. The first switching element is electrically connected to the control unit.
在本發明之一實施例中，電壓限制元件為一齊納二極體。In an embodiment of the invention, the voltage limiting element is a Zener diode.
在本發明之一實施例中，控制單元包括一限流元件、一第二阻抗元件、一第二切換元件、一第三阻抗元件及一第四阻抗元件。限流元件之一端與第一阻抗元件電性連接，另一端與電源供應模組電性連接。第二阻抗元件與限流元件電性連接。第二切換元件與第二阻抗元件、第一切換元件及電源供應模組電性連接。第三阻抗元件與第一切換元件及第二切換元件電性連接。第四阻抗元件與第一切換元件、第二切換元件及第三阻抗元件電性連接。In an embodiment of the invention, the control unit includes a current limiting component, a second impedance component, a second switching component, a third impedance component, and a fourth impedance component. One end of the current limiting component is electrically connected to the first impedance component, and the other end is electrically connected to the power supply module. The second impedance element is electrically connected to the current limiting element. The second switching component is electrically connected to the second impedance component, the first switching component, and the power supply module. The third impedance element is electrically connected to the first switching element and the second switching element. The fourth impedance element is electrically connected to the first switching element, the second switching element, and the third impedance element.
在本發明之一實施例中，第三阻抗元件之阻值等於第四阻抗元件之阻值。In an embodiment of the invention, the resistance of the third impedance element is equal to the resistance of the fourth impedance element.
在本發明之一實施例中，第一切換元件及第二切換元件分別為一半導體元件。In an embodiment of the invention, the first switching element and the second switching element are each a semiconductor element.
在本發明之一實施例中，電源供應模組包括一切換訊號產生單元及一切換單元。切換訊號產生單元電性連接控制單元，並輸出一切換訊號。切換單元電性連接切換訊號產生單元，並接收切換訊號。當電源供應模組之輸出電壓大於過載電壓值，控制單元降低切換訊號之工作週期，使調整後之輸出電壓不大於過載電壓值。In an embodiment of the invention, the power supply module includes a switching signal generating unit and a switching unit. The switching signal generating unit is electrically connected to the control unit and outputs a switching signal. The switching unit is electrically connected to the switching signal generating unit and receives the switching signal. When the output voltage of the power supply module is greater than the overload voltage value, the control unit reduces the duty cycle of the switching signal so that the adjusted output voltage is not greater than the overload voltage value.
在本發明之一實施例中，切換訊號為一脈衝寬度變調訊號。In an embodiment of the invention, the switching signal is a pulse width modulation signal.
在本發明之一實施例中，當電源供應模組之輸出電壓大於過載電壓值，發光單元發生開路的狀況。In an embodiment of the invention, when the output voltage of the power supply module is greater than the overload voltage value, the lighting unit is in an open state.
在本發明之一實施例中，顯示面板為一液晶顯示面板。In an embodiment of the invention, the display panel is a liquid crystal display panel.
為達上述目的，依據本發明之一種保護方法與一電路保護模組、一電源供應模組及一背光模組配合應用。電路保護模組具有一偵測單元及一控制單元，背光模組具有一發光單元。保護方法包括：由偵測單元偵測電源供應模組之一輸出電壓是否大於一過載電壓值；當結果為是，偵測單元輸出一偵測訊號；以及由控制單元依據偵測訊號調整電源供應模組之輸出電壓，使調整後之輸出電壓低於過載電壓值。To achieve the above object, a protection method according to the present invention is applied in combination with a circuit protection module, a power supply module, and a backlight module. The circuit protection module has a detecting unit and a control unit, and the backlight module has a light emitting unit. The protection method includes: detecting, by the detecting unit, whether the output voltage of one of the power supply modules is greater than an overload voltage value; when the result is yes, the detecting unit outputs a detecting signal; and the control unit adjusts the power supply according to the detecting signal The output voltage of the module is such that the adjusted output voltage is lower than the overload voltage value.
在本發明之一實施例中，當電源供應模組之輸出電壓大於過載電壓值，發光單元發生開路的狀況。In an embodiment of the invention, when the output voltage of the power supply module is greater than the overload voltage value, the lighting unit is in an open state.
在本發明之一實施例中，保護方法更包括：由控制單元降低電源供應模組之一切換訊號之工作週期。In an embodiment of the present invention, the protection method further includes: reducing, by the control unit, a duty cycle of switching the signal of one of the power supply modules.
為達上述目的，依據本發明之一種影像顯示系統包括一顯示裝置及一輸入單元。顯示裝置包括一顯示面板、一背光模組、一電路保護模組及一電源供應模組。背光模組具有一發光單元並提供顯示面板一光源。電路保護模組與發光單元電性連接，並具有一偵測單元及一控制單元。電源供應模組與背光模組電性連接，並提供一輸出電壓至發光單元。當電源供應模組之輸出電壓大於一過載電壓值，偵測單元輸出一偵測訊號。控制模組依據偵測訊號調整電源供應模組之輸出電壓，使調整後之輸出電壓低於過載電壓值。輸入單元耦接至顯示裝置，用以提供一輸入信號至顯示裝置，使顯示裝置產生影像。To achieve the above object, an image display system according to the present invention includes a display device and an input unit. The display device includes a display panel, a backlight module, a circuit protection module and a power supply module. The backlight module has a light emitting unit and provides a display panel and a light source. The circuit protection module is electrically connected to the light emitting unit, and has a detecting unit and a control unit. The power supply module is electrically connected to the backlight module and provides an output voltage to the light emitting unit. When the output voltage of the power supply module is greater than an overload voltage value, the detecting unit outputs a detection signal. The control module adjusts the output voltage of the power supply module according to the detection signal, so that the adjusted output voltage is lower than the overload voltage value. The input unit is coupled to the display device for providing an input signal to the display device to cause the display device to generate an image.
在本發明之一實施例中，影像顯示系統包括一平板電腦、一投影機、一電子書、一筆記型電腦、一手機、一數位相機、一個人數位助理、一桌上型電腦、一電視機、一車用顯示器、或一攜帶型DVD播放器。In an embodiment of the invention, the image display system includes a tablet computer, a projector, an electronic book, a notebook computer, a mobile phone, a digital camera, a number of assistants, a desktop computer, and a television set. , a car monitor, or a portable DVD player.
承上所述，因依據本發明之一種具有電路保護模組之顯示裝置及其保護方法係藉由偵測單元在電源供應模組之輸出電壓大於一過載電壓值時，輸出一偵測訊號，且控制單元依據偵測訊號調整電源供應模組之輸出電壓，使調整後的輸出電壓低於過載電壓值，從而實現能夠調整電源供應模組的輸出電壓，以減低元件的損壞，並提升可靠度與可應用性。According to the present invention, a display device having a circuit protection module and a protection method thereof according to the present invention output a detection signal when the output voltage of the power supply module is greater than an overload voltage value by the detecting unit. And the control unit adjusts the output voltage of the power supply module according to the detection signal, so that the adjusted output voltage is lower than the overload voltage value, thereby realizing the adjustment of the output voltage of the power supply module, thereby reducing component damage and improving reliability. And applicability.
以下將參照相關圖式，說明依本發明較佳實施例之具有電路保護模組之顯示裝置及其保護方法，其中相同的元件將以相同的參照符號加以說明。Hereinafter, a display device having a circuit protection module and a method for protecting the same according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals.
首先，請參照圖2A與圖2B，其為依據本發明較佳實施例之一種顯示裝置2。如圖2A所示，顯示裝置2係為一筆記型電腦之顯示器，其係依據使用者所輸入之指令，以顯示相對應的影像資料。此外，在實施上，顯示裝置2亦可設置於一行動電話、一數位相機、一個人數位助理、一桌上型電腦、一電視、一車用顯示器、或一攜帶式數位影音光碟播放器。First, please refer to FIG. 2A and FIG. 2B, which are a display device 2 according to a preferred embodiment of the present invention. As shown in FIG. 2A, the display device 2 is a display of a notebook computer, which is based on instructions input by the user to display corresponding image data. In addition, in implementation, the display device 2 can also be disposed on a mobile phone, a digital camera, a digital assistant, a desktop computer, a television, a vehicle display, or a portable digital video and audio disc player.
接著，如圖2B所示，其係為本發明之顯示裝置2之方塊圖。顯示裝置2係包括一顯示面板21、一背光模組22、一電路保護模組23及一電源供應模組24。於此，顯示面板21係例如是一液晶顯示面板。Next, as shown in FIG. 2B, it is a block diagram of the display device 2 of the present invention. The display device 2 includes a display panel 21, a backlight module 22, a circuit protection module 23, and a power supply module 24. Here, the display panel 21 is, for example, a liquid crystal display panel.
背光模組22與顯示面板21相對設置，並具有一發光單元221，以提供一光源L1 至顯示面板21。電路保護模組23與背光模組22之發光單元221電性連接，且電路保護模組23具有一偵測單元231及一控制單元232。電源供應模組24與背光模組22電性連接，並提供一輸出電壓VO1 至發光單元221，以提供發光單元221所需之操作電流及或操作電壓。在本實施例中，電源供應模組24係為一電源轉換器，例如是升降壓轉換器或升壓轉換器。The backlight module 22 is disposed opposite to the display panel 21 and has a light emitting unit 221 to provide a light source L 1 to the display panel 21 . The circuit protection module 23 is electrically connected to the light-emitting unit 221 of the backlight module 22, and the circuit protection module 23 has a detecting unit 231 and a control unit 232. The power supply module 24 is electrically connected to the backlight module 22 and provides an output voltage V O1 to the light emitting unit 221 to provide an operating current and or an operating voltage required by the light emitting unit 221 . In this embodiment, the power supply module 24 is a power converter, such as a buck-boost converter or a boost converter.
電路保護模組23之偵測單元231與電源供應模組24電性連接，且當電源供應模組24之一輸出電壓VO1 大於一過載電壓時，偵測單元231將輸出一偵測訊號S1 。控制單元232電性連接偵測單元231，並依據偵測訊號S1 調整電源供應模組24之輸出電壓VO1 ，使調整後的輸出電壓低於過載電壓值。The detecting unit 231 of the circuit protection module 23 is electrically connected to the power supply module 24, and when the output voltage V O1 of the power supply module 24 is greater than an overload voltage, the detecting unit 231 outputs a detecting signal S. 1 . The control unit 232 is electrically connected to the detecting unit 231, and adjusts the output voltage V O1 of the power supply module 24 according to the detecting signal S 1 so that the adjusted output voltage is lower than the overload voltage value.
在實施上，電路保護模組23係可與背光模組22或是與電源供應模組24整合設置於同一機構中，或整合設置於同一電路上，以有效減少裝置的體積。In practice, the circuit protection module 23 can be integrated with the backlight module 22 or the power supply module 24 in the same mechanism, or integrated on the same circuit, so as to effectively reduce the volume of the device.
接著，請參照圖3A及圖3B所示，以進一步說明本發明之電路保護模組23。在本實施例中，是以電源供應模組24為一升壓轉換器，且發光單元221具有一發光二極體(LED)為例，然並非用以限制電源供應模組24及發光單元221之態樣。另外，在實際運用時，發光單元221可具有其他數量之發光二極體，且發光二極體之間的連接方式可為串聯及或並聯。此外，由於本實施例係用以說明背光模組22、電路保護模組23與電源供應模組24之間的操作關係，因此，圖3A中並未描繪出顯示面板21。Next, please refer to FIG. 3A and FIG. 3B to further illustrate the circuit protection module 23 of the present invention. In this embodiment, the power supply module 24 is a boost converter, and the light-emitting unit 221 has a light-emitting diode (LED) as an example, but is not used to limit the power supply module 24 and the light-emitting unit 221 The situation. In addition, in actual use, the light emitting unit 221 may have other numbers of light emitting diodes, and the connection manner between the light emitting diodes may be serial and or parallel. In addition, since the embodiment is used to explain the operational relationship between the backlight module 22, the circuit protection module 23, and the power supply module 24, the display panel 21 is not depicted in FIG. 3A.
偵測單元231具有一電壓限制元件D1 、第一阻抗元件R1 及一第一切換元件SW1 。電壓限制元件D1 與電源供應模組24電性連接。第一阻抗元件R1 之一端與電壓限制元件D1 電性連接，而另一端與控制單元232電性連接。第一切換元件SW1 與控制單元232電性連接。在本實施例中，電壓限制元件D1 為一齊納二極體，且其崩潰電壓的選擇，係與發光單元221所需之操作電壓相關，例如崩潰電壓是發光單元221之操作電壓的1.2倍。此外，第一阻抗元件R1 為一電阻器，而第一切換元件SW1 為一半導體元件，例如是PNP形式的雙載子電晶體(BJT)。The detecting unit 231 has a voltage limiting element D 1 , a first impedance element R 1 and a first switching element SW 1 . The voltage limiting element D 1 is electrically connected to the power supply module 24 . One end of the first impedance element R 1 is electrically connected to the voltage limiting element D 1 , and the other end is electrically connected to the control unit 232 . The first switching element SW 1 is electrically connected to the control unit 232. In the present embodiment, the voltage limiting element D 1 is a Zener diode, and the selection of the breakdown voltage is related to the operating voltage required by the light emitting unit 221, for example, the breakdown voltage is 1.2 times the operating voltage of the light emitting unit 221. . Further, the first impedance element R 1 is a resistor, and the first switching element SW 1 is a semiconductor element such as a bi-carrier transistor (BJT) in the form of a PNP.
控制單元232包括一限流元件D2 、一第二阻抗元件R2 、一第二切換元件SW2 、一第三阻抗元件R3 及一第四阻抗元件R4 。限流元件D2 之一端與第一阻抗元件R1 電性連接，而另一端與電源供應模組24電性連接。第二阻抗元件R2 與限流元件D2 電性連接。第二切換元件SW2 與第二阻抗元件R2 、第一切換元件SW1 及電源供應模組24電性連接。第三阻抗元件R3 與第一切換元件SW1 及第二切換元件SW2 電性連接。第四阻抗元件R4 與第一切換元件SW1 、第二切換元件SW2 及第三阻抗元件R3 電性連接。The control unit 232 includes a current limiting component D 2 , a second impedance component R 2 , a second switching component SW 2 , a third impedance component R 3 , and a fourth impedance component R 4 . One end of the current limiting element D 2 is electrically connected to the first impedance element R 1 , and the other end is electrically connected to the power supply module 24 . The second impedance element R 2 is electrically connected to the current limiting element D 2 . The second switching element SW 2 is electrically connected to the second impedance element R 2 , the first switching element SW 1 , and the power supply module 24 . The third impedance element R 3 is electrically connected to the first switching element SW 1 and the second switching element SW 2 . The fourth impedance element R 4 is electrically connected to the first switching element SW 1 , the second switching element SW 2 , and the third impedance element R 3 .
在本實施例中，限流元件D2 為一個二極體。第二阻抗元件R2 、第三阻抗元件R3 及第四阻抗元件R4 分別為一電阻器。第二切換元件SW2 為一半導體元件，例如是PNP形式的雙載子電晶體(BJT)。此外，第三阻抗元件R3 係與第四阻抗元件R4 形成一分壓電路，以控制第二切換元件SW2 ，且第三阻抗元件R3 之阻值等於第四阻抗元件R4 之阻值。In this embodiment, the current limiting element D 2 is a diode. The second impedance element R 2 , the third impedance element R 3 , and the fourth impedance element R 4 are each a resistor. The second switching element SW 2 is a semiconductor element such as a bi-carrier transistor (BJT) in the form of a PNP. In addition, the third impedance element R 3 and the fourth impedance element R 4 form a voltage dividing circuit to control the second switching element SW 2 , and the resistance of the third impedance element R 3 is equal to the fourth impedance element R 4 Resistance value.
電源供應模組24包括一切換訊號產生單元241及一切換單元242。切換訊號產生單元241電性連接控制單元232之第二切換元件SW2 ，並輸出一切換訊號S2 至切換單元242。切換單元242電性連接切換訊號產生單元241，並接收切換訊號S2 ，且依據切換訊號S2 進行切換。在實施上，切換訊號產生單元241係為一脈衝寬度變調(PWM,pulse width modulation)訊號產生單元，而切換單元242為一場效電晶體(FET)。換句話說，切換訊號S2 為一脈衝寬度變調訊號，並用以控制切換單元242。The power supply module 24 includes a switching signal generating unit 241 and a switching unit 242. The switching signal generating unit 241 is electrically connected to the second switching element SW 2 of the control unit 232 and outputs a switching signal S 2 to the switching unit 242. The switching unit 242 is electrically connected to the switching signal generating unit 241, and receives the switching signal S 2 and performs switching according to the switching signal S 2 . In practice, the switching signal generating unit 241 is a pulse width modulation (PWM) signal generating unit, and the switching unit 242 is a field effect transistor (FET). In other words, the switching signal S 2 is a pulse width modulation signal and is used to control the switching unit 242.
需特別注意的是，本實施例是以電源供應模組24為升壓轉換器為例，因此電源供應模組24更具有其他之元件。然而，其他元件的組成並非本發明之重點，因而本發明並不針對其他元件的組成及連接關係進行敘述。It should be noted that the power supply module 24 is a boost converter as an example. Therefore, the power supply module 24 has other components. However, the composition of other elements is not the focus of the present invention, and thus the present invention is not described with respect to the composition and connection relationship of other elements.
請依據圖3A並搭配圖3B所示，在實際運用時，當發光單元221發生開路的狀況時，電源供應模組24之切換單元242仍持續進行運作。其中，當切換單元242導通時，電源供應模組24中的電感將進行儲能，而當切換單元242截止時，電感上所儲存之能量將轉移至一電容，但由於發光單元221已經形成開路，因而無法提供電容一個足以消耗其儲存能量的放電路徑。因此，電源供應模組24的輸出電壓VO1 將逐漸上升。Please refer to FIG. 3A and FIG. 3B. In actual operation, when the light-emitting unit 221 is in an open state, the switching unit 242 of the power supply module 24 continues to operate. Wherein, when the switching unit 242 is turned on, the inductance in the power supply module 24 will perform energy storage, and when the switching unit 242 is turned off, the energy stored in the inductor will be transferred to a capacitor, but since the light emitting unit 221 has formed an open circuit Therefore, it is impossible to provide a discharge path that is sufficient to consume its stored energy. Therefore, the output voltage V O1 of the power supply module 24 will gradually rise.
當電源供應模組24的輸出電壓VO1 大於一過載電壓值V，即電壓限制元件D1 的崩潰電壓時，由電壓限制元件D1 及第一阻抗元件R1 所組成的分支電路將被導通，這也將提供第一切換元件SW1 之基極(base)一條電流路徑，而使得第一切換元件SW1 被導通。因此，第二切換元件SW2 的基極與射極(emitter)將形成逆偏(reverse bias)，而使得流經第二阻抗元件R2 的電流為零，以停止電源供應模組24之切換訊號產生單元241的內部震盪，從而降低切換訊號S2 之工作週期(duty cycle)，並調整電源供應模組的輸出電壓VO1 ，使得調整後的輸出電壓VO2 低於過載電壓值V，以提供電源供應模組24之組成元件有效的過載保護。When the power supply module the output voltage of 24 V O1 is greater than an overcharge voltage value V, i.e., the voltage limiting element D breakdown voltage 1, a voltage-limiting element D 1 and the branch circuit of the first impedance element R consisting of 1 is turned on this will also provide the first switching element SW 1 of the base electrode (base) a current path, such that the first switching element SW 1 is turned on. Therefore, the base and the emitter of the second switching element SW 2 will form a reverse bias, so that the current flowing through the second impedance element R 2 is zero to stop the switching of the power supply module 24 . The internal oscillation of the signal generating unit 241 reduces the duty cycle of the switching signal S 2 and adjusts the output voltage V O1 of the power supply module so that the adjusted output voltage V O2 is lower than the overload voltage value V. Provides effective overload protection for the components of the power supply module 24.
值得一提的是，過載電壓值V是與電源供應模組24之組成元件的耐壓程度與背光模組22之發光單元221的數量及連接關係相關。換句話說，過載電壓值V的設定係可依據設計的考量與產品的需求而有所調整。It is worth mentioning that the overload voltage value V is related to the degree of withstand voltage of the components of the power supply module 24 and the number and connection relationship of the light-emitting units 221 of the backlight module 22. In other words, the setting of the overload voltage value V can be adjusted according to design considerations and product requirements.
請參照圖4之流程圖並搭配圖3A及圖3B所示，以說明本發明之較佳實施例之保護方法，其係可與上述之顯示裝置2搭配使用，而保護方法的步驟係包含步驟S01至步驟S03。Referring to the flowchart of FIG. 4 and FIG. 3A and FIG. 3B, the protection method of the preferred embodiment of the present invention can be used in combination with the above display device 2, and the steps of the protection method include steps. S01 to step S03.
步驟S01係由偵測單元231偵測電源供應模組24之一輸出電壓VO1 是否大於一過載電壓值V。在實施上，當背光模組22之發光單元221發生開路的狀況時，由於電源供應模組24之切換單元242仍持續運作，因而電源供應模組24之輸出電壓VO1 將逐漸上升。In step S01, the detecting unit 231 detects whether the output voltage V O1 of one of the power supply modules 24 is greater than an overload voltage value V. In practice, when the light-emitting unit 221 of the backlight module 22 is in an open state, since the switching unit 242 of the power supply module 24 continues to operate, the output voltage V O1 of the power supply module 24 will gradually rise.
步驟S02係當步驟S01之結果為是，偵測單元231輸出一偵測訊號S1 。在實施上，當電源供應模組24的輸出電壓VO1 大於過載電壓值V，即電壓限制元件D1 的崩潰電壓時，將使得偵測單元231之第一切換元件SW1 被導通，並輸出偵測訊號S1 。In step S02, when the result of step S01 is YES, the detecting unit 231 outputs a detection signal S 1 . In practice, when the output voltage V O1 of the power supply module 24 is greater than the overload voltage value V, that is, the breakdown voltage of the voltage limiting element D 1 , the first switching element SW 1 of the detecting unit 231 is turned on and output. Detection signal S 1 .
步驟S03係由控制單元232依據偵測訊號S1 調整電源供應模組24之輸出電壓VO1 ，使調整後的輸出電壓VO2 低於過載電壓值V。在實施上，由於偵測單元231之第一切換元件SW1 處於導通狀態。因此，第二切換元件SW2 的基極與射極將形成逆偏，使得流經第二阻抗元件R2 的電流為零。又由於控制單元232之第二切換元件SW2 是與切換訊號產生單元241之輸出電壓回授端連接，因此，控制單元232將停止電源供應模組24之切換訊號產生單元241的內部震盪，並降低切換訊號產生單元241所輸出之切換訊號S2 的工作週期。換句話說，切換單元242的切換頻率將被降低，從而降低電源供應模組24的輸出電壓VO1 ，並使調整後的輸出電壓VO2 低於過載電壓值V。In step S03, the control unit 232 adjusts the output voltage V O1 of the power supply module 24 according to the detection signal S 1 , so that the adjusted output voltage V O2 is lower than the overload voltage value V. In practice, the first switching element SW 1 of the detecting unit 231 is in an on state. Therefore, the base and emitter of the second switching element SW 2 will be reverse biased such that the current flowing through the second impedance element R 2 is zero. Moreover, since the second switching element SW 2 of the control unit 232 is connected to the output voltage feedback terminal of the switching signal generating unit 241, the control unit 232 will stop the internal oscillation of the switching signal generating unit 241 of the power supply module 24, and The duty cycle of the switching signal S 2 output by the switching signal generating unit 241 is reduced. In other words, the switching frequency of the switching unit 242 will be lowered, thereby reducing the output voltage V O1 of the power supply module 24 and making the adjusted output voltage V O2 lower than the overload voltage value V.
此外，當電源供應模組24之輸出電壓VO1 並未大於過載電壓值V，而使得結果為否時，其係代表背光模組22之發光單元221並未發生開路的狀況。此時，電路保護模組23將不進行任何動作，且電源供應模組24將繼續正常地運作，而電路保護模組23之偵測單元231將持續地偵測電源供應模組24之輸出電壓VO1 是否大於過載電壓值V。換句話說，電路保護模組23是一即時的電路保護模組。In addition, when the output voltage V O1 of the power supply module 24 is not greater than the overload voltage value V, and the result is no, it represents a situation in which the light-emitting unit 221 of the backlight module 22 does not open. At this time, the circuit protection module 23 will not perform any action, and the power supply module 24 will continue to operate normally, and the detecting unit 231 of the circuit protection module 23 will continuously detect the output voltage of the power supply module 24. Whether V O1 is greater than the overload voltage value V. In other words, the circuit protection module 23 is an instant circuit protection module.
請再參閱第5圖所示，其係為依據本發明實施例之影像顯示系統100的方塊示意圖。在本實施例中，影像顯示系統100包含一顯示裝置2及一輸入單元300。輸入單元300耦接至顯示裝置2，並提供一輸入信號S3 ，例如是影像顯示信號，至顯示裝置2，從而使顯示裝置2顯示相對應之影像。此外，影像顯示系統100可實施於電子裝置，例如：平板電腦(tablet personal computer)、投影機、電子書、筆記型電腦、手機、數位相機、個人數位助理(PDA)、桌上型電腦、電視機、車用顯示器、或攜帶型DVD播放器。另外，由於顯示裝置2的技術內容已於上述之實施例進行說明，故在此不再贅述。Please refer to FIG. 5 again, which is a block diagram of the image display system 100 according to an embodiment of the invention. In the embodiment, the image display system 100 includes a display device 2 and an input unit 300. The input unit 300 is coupled to the display device 2 and provides an input signal S 3 , such as an image display signal, to the display device 2 to cause the display device 2 to display a corresponding image. In addition, the image display system 100 can be implemented in an electronic device, such as a tablet personal computer, a projector, an e-book, a notebook computer, a mobile phone, a digital camera, a personal digital assistant (PDA), a desktop computer, a television. Machine, car display, or portable DVD player. In addition, since the technical content of the display device 2 has been described in the above embodiments, it will not be described herein.
綜上所述，因依據本發明之一種具有電路保護模組之顯示裝置及其保護方法係藉由偵測單元在電源供應模組之輸出電壓大於一過載電壓值時，輸出一偵測訊號，且控制單元依據偵測訊號調整電源供應模組之輸出電壓，使調整後的輸出電壓低於過載電壓值，從而實現能夠調整電源供應模組的輸出電壓，以減低元件的損壞，並提升可靠度與可應用性。In summary, the display device with the circuit protection module and the protection method thereof according to the present invention output a detection signal when the output voltage of the power supply module is greater than an overload voltage value by the detecting unit. And the control unit adjusts the output voltage of the power supply module according to the detection signal, so that the adjusted output voltage is lower than the overload voltage value, thereby realizing the adjustment of the output voltage of the power supply module, thereby reducing component damage and improving reliability. And applicability.
以上所述僅為舉例性，而非為限制性者。任何未脫離本發明之精神與範疇，而對其進行之等效修改或變更，均應包含於後附之申請專利範圍中。The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.
1、23．．．電路保護模組1,23. . . Circuit protection module
100．．．影像顯示系統100. . . Image display system
2．．．顯示裝置2. . . Display device
21．．．顯示面板twenty one. . . Display panel
22．．．背光模組twenty two. . . Backlight module
221．．．發光單元221. . . Light unit
231．．．偵測單元231. . . Detection unit
232．．．控制單元232. . . control unit
24、P．．．電源供應模組24, P. . . Power supply module
241．．．切換訊號產生單元241. . . Switching signal generating unit
242．．．切換單元242. . . Switching unit
300．．．輸入單元300. . . Input unit
D1 ‧‧‧電壓限制元件D 1 ‧‧‧Voltage limiting components
D2 ‧‧‧限流元件D 2 ‧‧‧ current limiting components
L‧‧‧負載L‧‧‧load
L1 ‧‧‧光源L 1 ‧‧‧Light source
R1 ‧‧‧第一阻抗元件R 1 ‧‧‧first impedance element
R2 ‧‧‧第二阻抗元件R 2 ‧‧‧second impedance element
R3 ‧‧‧第三阻抗元件R 3 ‧‧‧3rd impedance element
R4 ‧‧‧第四阻抗元件R 4 ‧‧‧fourth impedance element
S01~S03‧‧‧保護方法的步驟S01~S03‧‧‧Steps for protection methods
S1 ‧‧‧偵測訊號S 1 ‧‧‧Detection signal
S2 ‧‧‧切換訊號S 2 ‧‧‧Switching signal
S3 ‧‧‧輸入信號S 3 ‧‧‧ input signal
SW1 ‧‧‧第一切換元件SW 1 ‧‧‧First switching element
SW2 ‧‧‧第二切換元件SW 2 ‧‧‧Second switching element
V‧‧‧過載電壓值V‧‧‧Overload voltage value
VO1 ‧‧‧輸出電壓V O1 ‧‧‧Output voltage
VO2 ‧‧‧調整後的輸出電壓V O2 ‧‧‧Adjusted output voltage
圖1A為一種習知之電源供應模組於負載開路時的輸出電壓與切換訊號的波形圖；1A is a waveform diagram of an output voltage and a switching signal of a conventional power supply module when an load is open;
圖1B為一種習知之電路保護裝置的示意圖；1B is a schematic diagram of a conventional circuit protection device;
圖2A為依據本發明較佳實施例之一種顯示裝置的示意圖；2A is a schematic diagram of a display device in accordance with a preferred embodiment of the present invention;
圖2B為依據本發明較佳實施例之一種顯示裝置的方塊圖；2B is a block diagram of a display device in accordance with a preferred embodiment of the present invention;
圖3A為依據本發明較佳實施例之一種背光模組、電路保護模組及電源供應模組的示意圖；3A is a schematic diagram of a backlight module, a circuit protection module, and a power supply module according to a preferred embodiment of the present invention;
圖3B為依據本發明較佳實施例之電路保護模組啟動保護的波形圖；3B is a waveform diagram showing the startup protection of a circuit protection module according to a preferred embodiment of the present invention;
圖4為依據本發明較佳實施例之一種保護方法的流程圖；以及4 is a flow chart of a method of protection in accordance with a preferred embodiment of the present invention;
圖5為依據本發明另一實施例之影像顯示系統的方塊示意圖。FIG. 5 is a block diagram of an image display system according to another embodiment of the present invention.
2．．．顯示裝置2. . . Display device
21．．．顯示面板twenty one. . . Display panel
22．．．背光模組twenty two. . . Backlight module
221．．．發光單元221. . . Light unit
23．．．電路保護模組twenty three. . . Circuit protection module
231．．．偵測單元231. . . Detection unit
232．．．控制單元232. . . control unit
24．．．電源供應模組twenty four. . . Power supply module
S1 ．．．偵測訊號S 1 . . . Detection signal
L1 ．．．光源L 1 . . . light source
VO1 ．．．輸出電壓V O1 . . . The output voltage
Claims (13)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100147684A TWI447699B (en) | 2011-12-21 | 2011-12-21 | Display apparatus with circuit protection module and protection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100147684A TWI447699B (en) | 2011-12-21 | 2011-12-21 | Display apparatus with circuit protection module and protection method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201327534A TW201327534A (en) | 2013-07-01 |
| TWI447699B true TWI447699B (en) | 2014-08-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW100147684A TWI447699B (en) | 2011-12-21 | 2011-12-21 | Display apparatus with circuit protection module and protection method thereof |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWI447699B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106952585B (en) * | 2017-05-02 | 2023-08-22 | 深圳市洲明科技股份有限公司 | LED display screen system |
| CN112054663B (en) * | 2020-07-23 | 2022-03-04 | 北京控制工程研究所 | Low-temperature-drift overvoltage protection system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200518432A (en) * | 2003-10-28 | 2005-06-01 | Nec Tokin Corp | Power circuit |
| TW200839692A (en) * | 2007-03-21 | 2008-10-01 | Delta Electronics Inc | Liquid crystal display apparatus, backlight module and light source driving device thereof |
| TWM362492U (en) * | 2009-04-21 | 2009-08-01 | Darfon Electronics Corp | Backlight driving circuit |
| TW201008376A (en) * | 2008-08-07 | 2010-02-16 | Orise Technology Co Ltd | LED driver and power control circuit spread spectrum frequency modulation function and display panel using the same |
| TW201039317A (en) * | 2009-04-29 | 2010-11-01 | Tpo Displays Corp | System for displaying images |
-
2011
- 2011-12-21 TW TW100147684A patent/TWI447699B/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200518432A (en) * | 2003-10-28 | 2005-06-01 | Nec Tokin Corp | Power circuit |
| TW200839692A (en) * | 2007-03-21 | 2008-10-01 | Delta Electronics Inc | Liquid crystal display apparatus, backlight module and light source driving device thereof |
| TW201008376A (en) * | 2008-08-07 | 2010-02-16 | Orise Technology Co Ltd | LED driver and power control circuit spread spectrum frequency modulation function and display panel using the same |
| TWM362492U (en) * | 2009-04-21 | 2009-08-01 | Darfon Electronics Corp | Backlight driving circuit |
| TW201039317A (en) * | 2009-04-29 | 2010-11-01 | Tpo Displays Corp | System for displaying images |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201327534A (en) | 2013-07-01 |
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| MM4A | Annulment or lapse of patent due to non-payment of fees |