TWM410424U

TWM410424U - Driving circuit of light emitting diode and light source apparatus

Info

Publication number: TWM410424U
Application number: TW100206098U
Authority: TW
Inventors: Yung-Chen Lu
Original assignee: Excelliance Mos Corp
Priority date: 2011-04-07
Filing date: 2011-04-07
Publication date: 2011-08-21

Abstract

A driving circuit of a light emitting diode (LED) is capable of receiving a power to supply a driving current to an LED module. The driving circuit includes a first current path and a second current path. The first current path includes a switch. The switch is disposed between the LED module and a terminal. The switch has a control terminal and receives a control signal through the control terminal so as to control whether the LED module is coupled to the terminal via the switch. The second current path is coupled between the LED module and the terminal. The second current path includes an impedance unit and is coupled to the first current path in parallel.

Description

M410424 4 100:5-6 1 五、新型說明：【新型所屬之技術領域】本創作是有關於一種驅動電路與光源裝置，且特別疋有關於一種用於驅動發光二極體(light emitting diode， LED)的驅動電路與使用此驅動電路的光源裝置。【先前技術】 φ 發光二極體(light emitting diode，LED)的體積小、省電又耐用’再加上製程技術的日益成熟，故近來以發光二極體做為光源的產品越來越普遍。另一方面，在節能減碳科技的倡導下’發光二極體逐漸成為新一代的光源。由於發光二極體工作電壓低、能主動發光且有一定亮度，同時具備耐衝擊、抗振動、壽命長（1〇萬小時）之特點，故已被廣泛應用於各種領域，例如其可作為液晶顯示器（liquid crystal display, LCD)的背光源。一般而言’顯示器的對比值(contrast ratio)係藉由計 ® 算顯示晝面最高亮度（單位：cd/m2)與最低亮度之比值所 - 传出。其中動態對比(dynamic contrast)技術指的是，顯示器之背光源亮度還可配合顯示晝面明暗程度再作增減。舉例來說，當顯示暗態晝面時，背光源可隨之變暗，因此不易產生漏光情形；另外，由於背光源之驅動電流係依據月光源所需提供的強弱而調整’故可達省電目的。在習知技術中，發光二極體的亮度係藉由調整脈寬調變(pulse width modulation，PWM)訊號的工作期間(duty cycle)來調整。詳細來說，當PwM訊號的工作期間越短， 3 M410424 ；- 100-5-6 固定時間内通過發光二極體的電流會越少而使得發光二極體的平均亮度越低。然而，在實際操作上，pwM 訊號的工作期間有其調整極限（約〇1〜〇5%)，故僅藉由 PWM訊絲驢發光二極㈣電流仍舊無法有效降低發光二極體在暗態晝面時的亮度’從而使得顯示器無法呈現良好的動態對比。為改善上述問題，習知技藝者便額外利用線性調訊號（linear dimming signal)來控制通過發光二極體的電流。圖1為習知發光二極體之驅動電路的示意圖。如圖i 所不，驅動電路1〇〇包括線性調光器u〇、發光二極體 120、脈寬調變器（pUise width modulator) 130 以及電阻 R1 ’其中電源Vin提供電源給驅動電路1〇〇,且線性調光器110會依據線性調光訊號Sid來改變節點a的電壓準位。進一步而言，當顯示器要顯示暗態晝面時，線性調光器110會將節點A的電壓準位往下拉，以減少通過電阻R1的電流’從而減少通過發光二極體12〇的電流。如此一來’便能降低發光二極體12〇的亮度。另一方面，脈寬調變器130則是藉由控制pWM訊號SpwM&工作期間以控制開關Q0的開啟或關閉，進而調整發光二極體 120的亮度。如此一來’藉由調整Pwm訊號SPWM的工作期間’再加上將節點A的電壓準位例如是從1伏特(V) 拉至0.1V ’便能使通過發光二極體12〇的電流例如是從 1000毫安培(mA)降低至1mA。然而，上述用以降低通過發光一極體120之電流的效果仍然有限。 M410424 100-5-6 【新型内容】本創作提供一種發光二極體的驅動電路，其可提供微小的驅動電流給發光二極體，以使發光二極^發出低党度的亮光。 ^ 本創作提供一種光源裝置，其可提供良好的亮暗對本創作提出一種發光二極體的驅動電路，其適於接收一電源以提供一驅動電流給一發光二極體模組。驅動電路包括一第一電流路徑以及一第二電流路徑。第一電流路徑包括一第一開關。第一開關位於發光二極體模二，一端點之間。第一開關具有一第一控制端，並透過第一控制端接收一控制訊號，以控制發光二極體模組是否透過第一開關耦接端點。第二電流路徑耦接於發光二極體模、、且與^點之間。苐二電流路控包括一阻抗單元，且第二電流路徑與第一電流路徑並聯耦接。卜在本創作之一實施例中，上述之阻抗單元更包括— 第一電阻。 ^創作之—實施例中，上述之第—電阻之阻抗值的軏圍為一百萬至五千萬歐姆(〇hm)。在本創作之一實施例中，上述之端點為一接地端。在本創作之一實施例中，上述之第一電阻的―二電流路徑输，且第—電阻的—第二端_至在本創作之-實施例中，上述之阻抗單元更包括— 第-開關以及一第三開關。第二開關耦接於第―電阻與 5 100-5-6 ^也端之間。第二開關具有—第二控制端，二制端接收—直流訊號。第三 : 接地端之間。第三_且右—弟—控制端與控制端接收-轉侧訊號。弟二控制端，並透過第$ 括本ί作之-實關中’上述之第1流路徑更包 Ϊ =阻°第二電喊接於第—開關與接地端之間。在本創作之一實施例中，驅動電路更包括一體。一極體耦接於電源與第一開關之間。 ° 括一2創：之一實施例中，上述之第-電流路徑更包電感。電感輕接於二極體與一電容之間。 f本創作之—實施例中，上述之電源為—交流電 =4為交流電源之—端。第—開關與阻抗單元教聯耗接於交流電源與奸二極雜組之間。在本創作之一實施例中三電阻。上述之阻抗單元包括一第在本創作之一實施例中，上述之阻抗單元更包括一 f四開關以及一第五開關。第四開關耦接於第三電阻與毛光一極體模組之間。第四開關具有一第四控制端，並透過第四控制端接收一直流訊號。第五開關耦接於第四控=端與發光二極體模組之間。第五開關具有一第五控制鳊，並透過第五控制端接收一故障偵測訊號。 θ本創作還提出一種光源裝置，其適於接收一電源以提供光源。光源裝置包括一發光二極體模組以及上述之驅動電路。驅動電路耦接發光二極體模組，且適於接收電源以提供一驅動電流給發光二極體模組。 6 100-5-6 笛於上述’本創作所之發光二_的_電路提供带dL路徑與第二電流路徑給驅動電流，且由於第二 %流路徑上配置有阻抗單元，故能減少流過發光二極^ 的驅動電流，進而能有效地降低發光二極體的亮戶，從而使得本創作的光源t置能提供良好的亮暗對比;^ 為讓本創作之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。【實施方式】第一實施例圖2A為本創作之第一實施例之光源裝置的示意圖。請參照圖2A，光源裝置200適用於接收電源V1以提供光源，光源裝置200包括發光二極體(light emitting diode，LED)模組210以及驅動電路220。發光二極體模組 210包括多個發光二極體D1〜D3 (僅示意地繪示三個）。驅動電路220耦接發光二極體模組210,且適於接收電源 VI以提供驅動電流Idr給發光二極體模組210。驅動電路 220包括電流路徑pi以及電流路徑P2。電流路徑pi包括開關Q卜開關Q1位於發光二極體模組210與一端點 B之間，其中端點B例如為接地端。開關Q1具有控制端 G1，並透過控制端G1接收控制訊號Sc2，以控制開關 Q1的導通與否，亦控制即發光二極體模組210是否能透過開關Q1耦接至接地端。其中開關Q1例如為雙極接面電晶體(BJT)，且控制訊號Sc2例如為脈波寬度調變(pulse width modulation，PWM)訊號。應注意的是，在其他實施 7 M410424 100-5-6 例中開關Q1亦可是金屬氧化半導體場效電晶體 (MOSFET)或其他可作為開關使用的元件，本創作並不受限於此。另外，電流路徑P2輕接發光二極體模組與接地私（即端點B)。電流路徑P2包括阻抗單元222，且電流路徑P2與電流路徑P1並聯耦接。其中當開關Q1 導通或開啟時’發光二極體模組21〇透過開關Q1耦接至接地端’以使驅動電流Idr流至電流路徑P1 ;當開關Qi 關閉時，發光二極體模組21〇無法透過開關qi耦接至接地端以形成通路，故驅動電流Idr會從發光二極體模組 210流至電流路徑P2。如圖2A所示’本實施例之阻抗單元222包括電阻 R2。電阻R2的第一端E1與電流路徑pi搞接，且電阻 R2的第二端E2耦接至接地端。另外，電流路徑ρι更包括電阻R3 ’其中電阻尺3耦接於開關Q1與接地端之間。在本實施例中，電阻R2為高阻抗的電阻，其電阻值遠大於電阻R3的電阻值。舉例來說，本實施例之電阻R2阻抗值的範圍例如為一百萬至五千萬歐姆(〇hm)，而電阻 R3的電阻值例如為1〇歐姆。詳細來說’當控制訊號Sc2為邏輯高準位時，開關 Q1係處於導通的狀態（即開啟），從而使得大部分的驅動電流Idr (即電流η)流經電流路徑p卜另一小部份的驅動電流Idr (即電流12 )則是流經電流路徑p2 ^換句話說’在開關Q1開啟時’驅動電流Idr的電流量實質上等於電流路徑P1上之電流量與電流路徑P2上之電流量的總和。舉例來說’假設電源VI提供100伏特(V)的直流 100-5-6 電壓，且發光二極體模組210的跨壓為9〇v，則電流n 為1安培(A)，而電流12為1〇微安培A)。亦即，在開關Q1開啟時，流過發光二極體模組210的驅動電流Idr 約為1.00001A，與原先要設計流過1A並無太大差別。 /另一方面，當控制訊號Sc2為邏輯低準位時，開關 Ql係處於關閉的狀態，使得發光二極體模組21〇無法透過開關Q1耦接至接地端，而使得電流路徑ρι呈現斷路狀態，故驅動電流Idr僅會流經電流路徑P2。換句話說，在開關Q1關閉時，驅動電流Idr的電流量實質上等於電汍路徑P2上之電流量。舉例來說，假設電源V1提供ιοον =直流電壓，且發光二極體模組21〇的跨壓為9〇v，則電流II為0A，而電流12為ι〇//Α。亦即，在開關Q1 關閉時，流過發光二極體模組21〇的驅動電流I(k約為 1〇μΑ，其能使發光二極體D1〜D3呈現低亮度的效果。換句話說，應用本實施例之光源裝置2〇〇的顯示器，能呈現良好的暗態晝面。丈如前所述，發光二極體D1〜D3的亮度係取決於驅動電=Idr的大小，且對比值(contrast ratio)之換算是畫面全 2最大亮度除以畫面全黑亮度而得到對比值。由圖丨與述可知，即使是將線性調光器110搭配脈寬調變器头起使用’也僅能將驅動電流將低至1mA左右，其知枝術所能達到的對比值僅有1〇3(即lA/lmA =M410424 4 100:5-6 1 V. New description: [New technical field] This creation is related to a driving circuit and a light source device, and particularly relates to a method for driving a light emitting diode (light emitting diode, LED) drive circuit and light source device using the drive circuit. [Prior Art] φ Light-emitting diodes (LEDs) are small in size, power-saving and durable. Coupled with the increasing maturity of process technology, products with light-emitting diodes as light sources have become more and more popular. . On the other hand, under the advocacy of energy-saving and carbon-reduction technology, the light-emitting diode has gradually become a new generation of light source. Since the light-emitting diode has low operating voltage, active light emission and certain brightness, and has the characteristics of impact resistance, vibration resistance and long life (1 million hours), it has been widely used in various fields, for example, it can be used as a liquid crystal. A backlight for a liquid crystal display (LCD). In general, the contrast ratio of the display is transmitted by the ratio of the highest brightness (unit: cd/m2) to the lowest brightness. The dynamic contrast technique refers to the brightness of the backlight of the display can also be increased or decreased according to the brightness of the display surface. For example, when a dark state is displayed, the backlight can be darkened accordingly, so that light leakage is less likely to occur; in addition, since the driving current of the backlight is adjusted according to the strength required by the monthly light source, Electrical purpose. In the prior art, the brightness of the light-emitting diode is adjusted by adjusting the duty cycle of a pulse width modulation (PWM) signal. In detail, the shorter the working period of the PwM signal, the lower the average brightness of the light-emitting diode due to the less current flowing through the light-emitting diode at 3 M410424 ;- 100-5-6 for a fixed period of time. However, in practice, the operating limit of the pwM signal has its adjustment limit (about 〇1~〇5%), so the current can only be effectively reduced by the PWM signal 驴二 diode (4) current in the dark state. The brightness at the time of the facet makes the display unable to show good dynamic contrast. To improve the above problems, the skilled artisan additionally utilizes a linear dimming signal to control the current through the light emitting diode. FIG. 1 is a schematic diagram of a conventional driving circuit of a light emitting diode. As shown in FIG. 1, the driving circuit 1 includes a linear dimmer u 〇, a light emitting diode 120, a pUise width modulator 130, and a resistor R1 'where the power supply Vin supplies power to the driving circuit 1〇〇, and the linear dimmer 110 changes the voltage level of the node a according to the linear dimming signal Sid. Further, when the display is to display a dark state, the linear dimmer 110 pulls down the voltage level of the node A to reduce the current through the resistor R1, thereby reducing the current through the LED 12. As a result, the brightness of the light-emitting diode 12 turns can be reduced. On the other hand, the pulse width modulator 130 adjusts the brightness of the LED 120 by controlling the turn-on or turn-off of the switch Q0 during the operation of the pWM signal SpwM & In this way, by adjusting the operating period of the Pwm signal SPWM, and adding the voltage level of the node A to, for example, from 1 volt (V) to 0.1 V, the current passing through the LED 12 can be made, for example. It is reduced from 1000 milliamperes (mA) to 1 mA. However, the above effects for reducing the current passing through the light-emitting body 120 are still limited. M410424 100-5-6 [New Content] This creation provides a driving circuit for a light-emitting diode, which can provide a small driving current to the light-emitting diode, so that the light-emitting diode emits low-level light. The present invention provides a light source device that provides good brightness and darkness. The present invention proposes a driving circuit for a light emitting diode adapted to receive a power source to provide a driving current to a light emitting diode module. The drive circuit includes a first current path and a second current path. The first current path includes a first switch. The first switch is located between the second and second ends of the light-emitting diode. The first switch has a first control end and receives a control signal through the first control terminal to control whether the LED module is coupled to the end point through the first switch. The second current path is coupled between the illuminating diode dies and between the points. The second current path includes an impedance unit, and the second current path is coupled in parallel with the first current path. In an embodiment of the present invention, the impedance unit further includes a first resistor. ^Creation - In the embodiment, the impedance value of the above-mentioned first-resistance is from 1 million to 50 million ohms (〇hm). In an embodiment of the present invention, the end point is a ground. In an embodiment of the present invention, the "second current path" of the first resistor, and the second end of the first resistor - in the embodiment of the present invention, the impedance unit further includes - A switch and a third switch. The second switch is coupled between the first resistor and the 5 100-5-6 ^ terminal. The second switch has a second control terminal, and the second terminal receives a DC signal. Third: between the ground terminals. The third _ and right-di-the control terminal and the control terminal receive-turn the side signal. The second control terminal, and through the first ί ί - 实实 ’ ’ ’ ’ ’ ’ 上述上述上述上述上述上述上述上述上述上述上述上述上述上述上述上述上述上述上述第二第二第二第二第二第二第二第二第二第二第二第二In one embodiment of the present invention, the drive circuit further includes a body. A pole body is coupled between the power source and the first switch. ° Including a 2: In one embodiment, the above-mentioned first current path is more inductive. The inductor is lightly connected between the diode and a capacitor. f In the present invention, in the embodiment, the above-mentioned power source is - alternating current = 4 is the end of the alternating current power source. The first switch and the impedance unit are connected between the AC power supply and the eclipse. In one embodiment of the present invention, a three resistor. The impedance unit described above includes an embodiment of the present invention. The impedance unit further includes a f-four switch and a fifth switch. The fourth switch is coupled between the third resistor and the glare unit. The fourth switch has a fourth control terminal and receives the DC signal through the fourth control terminal. The fifth switch is coupled between the fourth control terminal and the LED module. The fifth switch has a fifth control port and receives a fault detection signal through the fifth control terminal. θ This creation also proposes a light source device adapted to receive a power source to provide a light source. The light source device includes a light emitting diode module and the above driving circuit. The driving circuit is coupled to the LED module and is adapted to receive power to provide a driving current to the LED module. 6 100-5-6 The flute in the above-mentioned 'the light-emitting two__ circuit of the present invention provides the dL path and the second current path to the drive current, and since the impedance unit is arranged on the second % flow path, the flow can be reduced The driving current of the light-emitting diodes can effectively reduce the brightness of the light-emitting diodes, so that the light source t of the present invention can provide a good contrast between light and dark; ^ to make the above features and advantages of the creation more It is obvious that the embodiments are described below in detail with reference to the accompanying drawings. [Embodiment] FIG. 2A is a schematic view of a light source device according to a first embodiment of the present invention. Referring to FIG. 2A, the light source device 200 is adapted to receive a power source V1 to provide a light source. The light source device 200 includes a light emitting diode (LED) module 210 and a driving circuit 220. The light emitting diode module 210 includes a plurality of light emitting diodes D1 to D3 (only three are shown schematically). The driving circuit 220 is coupled to the LED module 210 and is adapted to receive the power source VI to provide a driving current Idr to the LED module 210. The drive circuit 220 includes a current path pi and a current path P2. The current path pi includes a switch Q, and the switch Q1 is located between the LED module 210 and an end point B, wherein the end point B is, for example, a ground. The switch Q1 has a control terminal G1 and receives a control signal Sc2 through the control terminal G1 to control whether the switch Q1 is turned on or not. It is also controlled whether the LED module 210 can be coupled to the ground through the switch Q1. The switch Q1 is, for example, a bipolar junction transistor (BJT), and the control signal Sc2 is, for example, a pulse width modulation (PWM) signal. It should be noted that in other embodiments 7 M410424 100-5-6, the switch Q1 may also be a metal oxide semiconductor field effect transistor (MOSFET) or other component that can be used as a switch, and the creation is not limited thereto. In addition, the current path P2 is lightly connected to the LED module and grounded (ie, end B). The current path P2 includes an impedance unit 222, and the current path P2 is coupled in parallel with the current path P1. When the switch Q1 is turned on or turned on, the 'light-emitting diode module 21〇 is coupled to the ground terminal through the switch Q1' to drive the driving current Idr to the current path P1; when the switch Qi is turned off, the light-emitting diode module 21 The driving current Idr can flow from the LED module 210 to the current path P2. As shown in Fig. 2A, the impedance unit 222 of the present embodiment includes a resistor R2. The first end E1 of the resistor R2 is coupled to the current path pi, and the second end E2 of the resistor R2 is coupled to the ground. In addition, the current path ρι further includes a resistor R3 ’, wherein the resistor scale 3 is coupled between the switch Q1 and the ground. In the present embodiment, the resistor R2 is a high-impedance resistor whose resistance value is much larger than the resistance value of the resistor R3. For example, the resistance value of the resistor R2 of the present embodiment ranges, for example, from one million to fifty million ohms (〇hm), and the resistance value of the resistor R3 is, for example, one ohm. In detail, when the control signal Sc2 is at a logic high level, the switch Q1 is in an on state (ie, turned on), so that most of the driving current Idr (ie, current η) flows through the current path p and another small portion. The drive current Idr (ie, current 12) flows through the current path p2. In other words, when the switch Q1 is turned on, the amount of current of the drive current Idr is substantially equal to the amount of current on the current path P1 and the current path P2. The sum of the electric currents. For example, 'assuming that the power supply VI provides 100 volts (V) of DC 100-5-6 voltage, and the voltage across the LED module 210 is 9 〇v, the current n is 1 amp (A), and the current 12 is 1 〇 micro amp A). That is, when the switch Q1 is turned on, the driving current Idr flowing through the light-emitting diode module 210 is about 1.00001A, which is not much different from the original design flow through 1A. On the other hand, when the control signal Sc2 is at a logic low level, the switch Q1 is in a closed state, so that the LED module 21 can not be coupled to the ground through the switch Q1, so that the current path ρι is broken. State, so the drive current Idr will only flow through the current path P2. In other words, when the switch Q1 is turned off, the amount of current of the drive current Idr is substantially equal to the amount of current on the path P2. For example, suppose the power supply V1 provides ιοον = DC voltage, and the voltage across the LED module 21〇 is 9〇v, then the current II is 0A, and the current 12 is ι〇//Α. That is, when the switch Q1 is turned off, the driving current I (k is about 1 〇μΑ flowing through the light-emitting diode module 21〇, which enables the light-emitting diodes D1 to D3 to exhibit a low brightness effect. The display of the light source device 2〇〇 of the embodiment can exhibit a good dark state. As mentioned above, the brightness of the LEDs D1 to D3 depends on the driving power = Idr, and the contrast The conversion of the contrast ratio is the maximum brightness of the screen, divided by the total black brightness of the screen, and the contrast value is obtained. As can be seen from the figure and the description, even if the linear dimmer 110 is used with the pulse width modulator head, Only the driving current will be as low as 1mA, and the contrast value that can be achieved by Zhizhi is only 1〇3 (ie lA/lmA =

1U ) ° PM /zA」、、?’在本貧施例中’對比值卻大約為1〇5(即1A/10 ^ 1())，其相較於習知技術的對比值要高出許多，而的動態對比也能提高許多。此外，由於本實施例不夸 100-5-6 ===器’只須採用高阻^7且抗單元 220的酉 ==隹對比效果，故能節省驅動電路而i甘:S而有效縮小光源裝置2GG的體積。然光心，。施。中’阻抗單元222亦可與習知的線性調 =或脈寬缝器_並存，或者三者同時明並不受限於此❶ +5x 圖之阻抗單元之另一實施態樣的示意，。，同時參照圖Μ與圖犯，在本實接更Λ括開關吸以及開關⑺。開關_接於^ =2與接桃之間，且開關Q2具有控制端G2，以接收關軸接於控制端G2與接地端之間。 :有」空制端G3,並透過控制端G3接收故障_ 訊唬sFauk。一般而言，在光源裝置2〇〇正常運下’故障读測訊號SFault通常處於邏輯低準位，而當光源裝置·發生故障時（例如開關Q1或發光二極體D卜、 D2或D3的毀損），故障摘測訊號心她會由邏輯低準位而使得開關Φ開啟’進而導致開關 Q2關閉。如此一來’電阻R2的第二端£ (floating)的狀態，進而使電源V1停止提供驅動電流此給發光二極體D1〜D3，以完全關閉發光二極體模組21〇。換句話說，當具有阻抗單元322的光源裝置細發生故障時’光源裝置2GG會被完全關閉’以使應 200的顯示面板呈現全黑的狀態，故能達^電通知的效果。 10 M410424 ^100^-6 ，修補充; 第二實施例圖3A為本創作之第二實施例之光源裝置的示意圖。本實施例之光源裝置300與圖2A之光源裝置200類似，惟二者主要差異之處在於：驅動電路320更包括二極體D4，且電流路徑ΡΓ更包括電感L1。另外，驅動電路320還可包括電容C1以作為濾波使用。1U) ° PM /zA", ?? In this lean example, the contrast value is about 1〇5 (ie 1A/10 ^ 1()), which is higher than the comparison value of the prior art. Many, and the dynamic contrast can be improved a lot. In addition, since this embodiment does not boast 100-5-6 === the device 'only needs to adopt high resistance ^7 and resists the contrast effect of the unit 220 隹==隹, so it can save the driving circuit and i Gan:S and effectively reduce The volume of the light source device 2GG. However, light heart,. Shi. The medium impedance unit 222 may also coexist with a conventional linear modulation or pulse width slitter _, or both of them are not limited to the illustration of another embodiment of the impedance unit of the ❶ +5x diagram. At the same time, referring to the diagram and the diagram, in this implementation, the switch suction and the switch (7) are included. The switch _ is connected between ^=2 and the peach, and the switch Q2 has the control terminal G2, so that the receiving shaft is connected between the control terminal G2 and the ground. : There is an empty terminal G3, and receives the fault _ sFauk through the control terminal G3. In general, the fault reading signal SFault is normally at a logic low level when the light source device 2 is normally operated, and when the light source device fails (for example, the switch Q1 or the light emitting diode D, D2 or D3) Damage), the fault will be measured by the logic low level and the switch Φ will be turned on, which will cause the switch Q2 to close. As a result, the second end of the resistor R2 is in a floating state, and the power supply V1 is stopped from supplying the driving current to the light-emitting diodes D1 to D3 to completely turn off the light-emitting diode module 21A. In other words, when the light source device having the impedance unit 322 is finely broken, the light source device 2GG is completely turned off so that the display panel of the panel 200 is in a state of being completely black, so that the effect of the notification can be achieved. 10 M410424 ^100^-6, Supplementary Supplement; Second Embodiment Fig. 3A is a schematic view of a light source device of a second embodiment of the present invention. The light source device 300 of the present embodiment is similar to the light source device 200 of FIG. 2A, but the main difference is that the driving circuit 320 further includes a diode D4, and the current path 包括 further includes the inductor L1. Additionally, drive circuit 320 may also include capacitor C1 for use as a filter.

如圖3A所示，二極體D4辆接於電源VI與開關Q1’ 之間。電容C1耦接於電源VI與阻抗單元222之間。電感L1耦接於二極體D4與電容C1之間。電阻R3耦接於開關Q1’與接地端之間。除此之外，發光二極體模組210 的兩端與電容C1的兩端彼此耦接，且發光二極體模組 210、二極體D4以及電容C1皆與電源VI耦接。詳細來說，電容C1的第一端E3耦接電源VI，且電容C1的第二端E4耦接電阻R2的第一端E1。電感L1的第一端E5 耦接電阻R2的第一端E1，且電感L1的第二端E6耦接開關Q1’，其中在本實施例中開關Q1’例如為金屬氧化半導體場效電晶體(MOSFET)。類似地，當控制端G1’上的控制訊號Sc3為邏輯高準位時，開關Q1’係處於導通的狀態（即開啟），亦即發光二極體模組210能透過開關Q1’耦接至端點B(即接地端）形成通路，從而使得大部分的驅動電流Idr (即電流 II )流經電流路徑P1’。另一小部份的驅動電流Idr (即電流12 )則是流經電流路徑P2。此時，應用此光源裝置300 的顯示器例如是顯示亮態晝面。另一方面，當控制訊號Sc3為邏輯低準位時，開關 11 M410424 v 100-5-6As shown in Fig. 3A, the diode D4 is connected between the power source VI and the switch Q1'. The capacitor C1 is coupled between the power source VI and the impedance unit 222. The inductor L1 is coupled between the diode D4 and the capacitor C1. The resistor R3 is coupled between the switch Q1' and the ground. In addition, the two ends of the LED module 210 and the two ends of the capacitor C1 are coupled to each other, and the LED module 210, the diode D4 and the capacitor C1 are coupled to the power source VI. In detail, the first end E3 of the capacitor C1 is coupled to the power source VI, and the second end E4 of the capacitor C1 is coupled to the first end E1 of the resistor R2. The first end E5 of the inductor L1 is coupled to the first end E1 of the resistor R2, and the second end E6 of the inductor L1 is coupled to the switch Q1'. In the embodiment, the switch Q1' is, for example, a metal oxide semiconductor field effect transistor ( MOSFET). Similarly, when the control signal Sc3 on the control terminal G1' is at a logic high level, the switch Q1' is in an on state (ie, turned on), that is, the LED module 210 can be coupled to the switch Q1' through the switch Q1'. End point B (ie, the ground) forms a path such that most of the drive current Idr (ie, current II) flows through current path P1'. Another small portion of the drive current Idr (i.e., current 12) flows through current path P2. At this time, the display to which the light source device 300 is applied is, for example, a bright state. On the other hand, when the control signal Sc3 is at a logic low level, the switch 11 M410424 v 100-5-6

Ql’係處於關閉的狀態，亦即發光二極體模組21〇無法透過開關Q1’耦接至接地端，故電流路徑P1，呈現斷路狀態，使得驅動電流Idr僅流經電流路徑P2。由於此時的電流12為一微小電流，故應用此光源裝置的顯示号能有效地呈現暗態晝面。除此之外，在本實施例中，由於流經發光二極體模組210的驅動電流Idr之最大值與最小值的差距可以很大，故光源裝置能提供高對比的^暗度，從而使得應用本創作之光源裝置3〇〇的顯示养具^ 良好的動態對比效果。The Ql' is in a closed state, that is, the LED module 21 is not coupled to the ground through the switch Q1', so the current path P1 assumes an open state, so that the drive current Idr flows only through the current path P2. Since the current 12 at this time is a minute current, the display number of the light source device can effectively exhibit a dark state. In addition, in this embodiment, since the difference between the maximum value and the minimum value of the driving current Idr flowing through the LED module 210 can be large, the light source device can provide a high contrast darkness, thereby The display fixture of the light source device of the present application is used to have a good dynamic contrast effect.

此外，由於本實施例不需採用習知的線性調光器 ^須採用體積小且高阻抗的阻抗單元222就能達到^ 高動態對比效果’故能節省驅動電路32()的配置空間1 進而有效縮小光源裝置綱的體積。然而，在例中，阻抗單元222亦可與與習知的線性調光器或ς ^器同時並存’或者三者同時存在，本發明並不受朽In addition, since the present embodiment does not need to use a conventional linear dimmer, the small-sized and high-impedance impedance unit 222 can achieve a high dynamic contrast effect, so that the configuration space of the driving circuit 32 can be saved. Effectively reduce the size of the light source device. However, in the example, the impedance unit 222 can also coexist with a conventional linear dimmer or a device, or both.

，3Β為圖3Α之阻抗單元之另一實施態樣的矛, ，1同時參照圖3Α與圖3Β，在本實施態樣中，㈣早το 322更包括開關Q2以及開關Q =與接地端之間’且開_具有控制端直^訊说Vee。_ Q3墟於控 = :Γ有控:端〇3,並透過控制端《接收故障： T . 裝置發生故障二 12 M410424 100-5-6 D2或D3的毀損），故障偵測訊號sFault會由邏輯低準位轉為逛輯高準位’而使得開關q3開啟’進而導致開關 Q2關閉。如此一來’電阻幻的第二端E2便處於浮接 (floating)的狀態，進而使電源vi停止提供驅動電流Wr 給發光二極體D1〜D3，以完全關閉發光二極體模組21〇。換句話說’當具有阻抗單元322的光源裝置3〇〇發生故障時’光源裝置300會被完全關閉，以使應用光源裝置 3〇〇的顯示面板呈現全黑的狀態，故能達到省電以及故障通知的效果。第三實施例圖4A為本創作之第三實施例之光源裝置的示意圖。請參照圖4A ’光源裝置400適用於接收電源V2以提供光源，光源裝置400包括發光二極體模組210以及驅動電路420。發光二極體模組210包括多個發光二極體 D1〜D3 (僅示意地繪示三個）。驅動電路42〇耦接發光二極體模組210，且適於接收電源V2以提供驅動電流Idr 給發光二極體模組210。驅動電路420包括電流路徑|>3 以及電流路徑P4。電流路徑P3包括開關Q4。開關Q4 位於發光二極體模組210與一端點C之間，其中開關Q4 具有控制端G4’並透過控制端G4接收控制訊號Sc3，以控制開關Q4的開啟或關閉，亦即控制發光二極體模組 210是否能透過開關Q4耦接端點C。其中本實施例之端點C為電源V2之一端。另外，電流路徑P4包括阻抗單元422，且電流路徑 13 M410424 100-5-6 ! P4與電流路徑P3並軸接於電源v2與發光二極體模組 210之間。其中當開關Q4導通（即開啟）時’使發光二極體杈組210透過開關卩4耦接電源v2之一端時，驅動電流Idr會流經電流路徑p3 ;當開關Q4關閉時，由於發光二極體模組210無法透過開關Q4耦接電源V2，驅動電流Idr僅會流經電流路徑p4。在本實施例中，電源V2例如為交流電源Vac，且開關Q4與阻抗單元422並聯叙接於交流電源Vac與發光二極體模組210之間。另外，在本實施例中，開關Q4可採用三極交流開關（Tri-electrode AC，TRIAC)以實施其功能，但不限制於此。另外，開關q4對應調整光源的照度值可分為數個等級，其中每一等級對應不同的延遲角 (delay angle)α。延遲角α越大則導通角越小，代表開關 Q4關閉的時間越長。除此之外，電源V2可為市用的交流電源或電源供應器所提供的電源，但不限制於此。父如圖4A所示，本實施例之阻抗單元422包括電阻 R4。電阻R4的第一端E7與電流路徑P3耦接，且電阻 R4的第二端E8耦接至電源V2。在本實施例中，電阻= 為高阻抗的電阻’其阻抗值的範圍例如為一百萬萬歐姆(Ohm) ’故會使得流過電阻R4的電流彳良微, 而可使發光二極體D1〜D3發出低亮度的光。 < 詳細來說’當控制訊號Sc4為邏輯高準位時， Q4係處於導通的狀態（即開啟），從而使得大部八開關動電流Idr(即電流13)流經電流路徑P3，而小;二的驅動電流Idr(即電流14 )則是流經電流路徑p4。換1句$驅， IRU-^-b 在閜關。济母趣開啟時，驅動電流1dr的電流量實質上等於電和，而2上之電流量與電流路徑P4上之電流量的總而將☆電流12的電流量十分微小，故可以忽略不計，本身的^電流Idr近似為電流13的電流量。由於開關Q4 而便發ΐ 1故會奴夠大的電流通過_ Q4，進亮4的f極體她21G有足夠的·^動電流Idr來發出高如係方面’當控制訊號Se4為邏輯低準位時，開關故關閉的狀態，使得電流路彳I P3呈現斷路狀態， W關Μ流他僅流經電流路徑P4。換句話說，在開關 Μ時，驅動電流Idr的電流量實質上等於電流路徑上之電流量’此時由於電阻R4的阻抗值很高，僅有小部分的電流14流過電流路徑P4，故僅有微小的驅動電流Idr來驅動發光二極體模組2i〇，從而使得發光二極體 D1〜D3能發出低焭度的光。值得一提的是，在圖4A中，驅動電流Idr與電流13、14雖是沿順時針方向流往交流電源Vac，然而驅動電流Idr與電流13、14亦可沿逆時針方向流往交流電源Vac。進一步而言，驅動電流Idr與電流 13、14的流動方向係依據交流電源Vac之輸出電壓的極性而有所不同’圖4A僅示意地緣示其中—種情況而已。類似第一實施例，本實施例藉由採用高阻抗的阻抗單元422，在不影響發光二極體D1〜D3的高亮度表現的情況下，還能使發光二極體D1〜D3產生良好亮度效果。因此，應用本實施例之光源裝置4〇〇的顯示器，能呈現良好的暗態與亮態晝面，進而達到高動態對比的效 15 M410424 ^0-5-6 果。此外，本實施例以採用習知的線性調光器β 採用體積，的阻抗單元奶就能果，故能轉電路馳置㈣，進而有效 ς 裝置400的體積。义萌、圖4Β為圖4Α之阻抗單元之另一實施態樣的示竟圖。請同時參照® 4Α與圖4Β，在本實施例中，阻抗^ 元522更包括開關Q5以及開關Q6。開關Q5耦接於 R4與發光二極體模組21〇之間，其中開關Μ具有控制 - 端G5 ’以接收直流訊號Vcc。開關q6耗接於控制端a _ 與發光二極體模組21〇之間。其中開關Q6具有控制端 G6 ’並透過控制端G6接收故障偵測訊號仙。身又而S，在光源裝置,400正常運作的情況下，故障偵測訊唬SFault通常處於邏輯低準位，而當光源裝置4〇〇發^故障時（例如開關Q4或發光二極體D1、D2或D3 =毀損），故障偵測訊號sFault會由邏輯低準位轉為邏輯冋準位，而使得開關q6開啟，進而導致開關q5關閉。如此一來，電阻R4的第一端E7便處於浮接(fl〇atin幻的狀態，進而使得電源V2無法提供驅動電流Idr給發光二攀極f D1〜D3 ’故能完全關閉發光二極體模組210。換句 - 話說，當具有阻抗單元522的光源裝置4〇〇發生故障時，光源裝置400會完全關閉，以使應用光源裝置4〇〇的顯示面板呈現全黑的狀態，故能達到省電以及故障通知的效果。綜上所述’本創作之發光二極體的驅動電路提供兩電流路徑給驅動電流，且其中之—的電流路徑配置有高 16 100-5-6 極體的電流量，進時機大幅減少流過發光二另-方面，由提供良好的亮暗對比度。置與驅動轨科故賴仙光源裝定太創你本，作已以實施例揭露如上’然其並非用以限屬技術領域中具有通常知識者，在不精神和範圍内，當可作些許之更動與潤創作之保護範圍當視後附之申請專利範圍所界【圖式簡單說明】圖1為習知發光二極體之驅動電路的示意圖。圖2A為本創作之第一實施例之光源裝置的示意圖。圖2B為圖2八之阻抗單元之另一實施態樣的示意圖。圖3A為本創作之第二實施例之光源裝置的示意圖。圖3B為目3A之阻抗單元之另一實施態樣的示意圖。圖4A為本創作之第三實施例之光源裝置的示意圖。圖4B為圖4A之阻抗單元之另一實施態樣的示意圖。【主要元件符號說明】 100、220、420 :驅動電路 17 M410424 100-5-6 200、300、400 :光源裝置 110 :線性調光器 120、D1〜D3 :發光二極體 130 :脈寬調變器 D4 :二極體 210 :發光二極體模組 222、322、422、522 :阻抗單元 A :節點 B、C :端點3Β is another embodiment of the impedance unit of FIG. 3Α, 1 refers to FIG. 3Α and FIG. 3Β simultaneously, and in the embodiment, (4) early το 322 further includes switch Q2 and switch Q= and ground terminal Between 'and open _ with control terminal directly to say Vee. _ Q3 rudder in control = : Γ control: end 〇 3, and through the control end "receive fault: T. device failure 2 12 M410424 100-5-6 D2 or D3 damage", the fault detection signal sFault will be The logic low level is turned to the high level 'and the switch q3 is turned on' and the switch Q2 is turned off. In this way, the second end E2 of the resistor is floating, and the power supply vi stops supplying the driving current Wr to the LEDs D1 to D3 to completely turn off the LED module 21〇. . In other words, 'When the light source device 3 having the impedance unit 322 fails, the light source device 300 is completely turned off, so that the display panel to which the light source device 3 is applied is in an all black state, thereby achieving power saving and The effect of the fault notification. THIRD EMBODIMENT Fig. 4A is a schematic view of a light source device of a third embodiment of the present invention. Referring to FIG. 4A, the light source device 400 is adapted to receive the power source V2 to provide a light source. The light source device 400 includes a light emitting diode module 210 and a driving circuit 420. The LED module 210 includes a plurality of LEDs D1 to D3 (only three are shown schematically). The driving circuit 42 is coupled to the LED module 210 and is adapted to receive the power source V2 to provide the driving current Idr to the LED module 210. The drive circuit 420 includes a current path|>3 and a current path P4. Current path P3 includes switch Q4. The switch Q4 is located between the LED module 210 and an end point C, wherein the switch Q4 has a control terminal G4' and receives a control signal Sc3 through the control terminal G4 to control the opening or closing of the switch Q4, that is, controlling the LED Whether the body module 210 can be coupled to the end point C through the switch Q4. The terminal C of this embodiment is one end of the power source V2. In addition, the current path P4 includes an impedance unit 422, and the current path 13 M410424 100-5-6 ! P4 and the current path P3 are axially coupled between the power source v2 and the LED module 210. When the switch Q4 is turned on (ie, turned on), when the light-emitting diode group 210 is coupled to one end of the power source v2 through the switch 卩4, the driving current Idr flows through the current path p3; when the switch Q4 is turned off, due to the light-emitting two The pole body module 210 cannot be coupled to the power source V2 through the switch Q4, and the driving current Idr only flows through the current path p4. In this embodiment, the power source V2 is, for example, an AC power source Vac, and the switch Q4 and the impedance unit 422 are connected in parallel between the AC power source Vac and the LED module 210. Further, in the present embodiment, the switch Q4 may employ a tri-electrode AC (TRIAC) to perform its function, but is not limited thereto. In addition, the illuminance value of the switch q4 corresponding to the adjustment source can be divided into several levels, wherein each level corresponds to a different delay angle α. The larger the retardation angle α, the smaller the conduction angle, and the longer the switch Q4 is turned off. In addition, the power supply V2 can be a power supply for a commercial AC power supply or a power supply, but is not limited thereto. Parent As shown in Fig. 4A, the impedance unit 422 of this embodiment includes a resistor R4. The first end E7 of the resistor R4 is coupled to the current path P3, and the second end E8 of the resistor R4 is coupled to the power source V2. In the present embodiment, the resistance = the resistance of the high impedance 'the range of the impedance value is, for example, one million ohms (Ohm)', so that the current flowing through the resistor R4 is fine, and the light-emitting diode can be made D1 to D3 emit low-intensity light. < In detail, when the control signal Sc4 is at a logic high level, Q4 is in an on state (ie, turned on), so that most of the eight-switching current Idr (ie, current 13) flows through the current path P3, and is small. The driving current Idr of the second (ie, current 14) flows through the current path p4. Change one sentence to $ drive, IRU-^-b is at Shaoguan. When the prime frequency is turned on, the current amount of the driving current 1dr is substantially equal to the electric sum, and the current amount on 2 and the current amount in the current path P4 are ☆ the current amount of the current 12 is very small, so it can be ignored. The current Idr of itself is approximately the amount of current of the current 13. Because of the switch Q4, it will cause a large current to pass through _Q4, and the bright body of the f pole body 21G has enough ·^ moving current Idr to emit high as the system' when the control signal Se4 is logic low When the position is on, the state of the switch is turned off, so that the current path I P3 is in an open state, and the W is only flowing through the current path P4. In other words, at the time of the switch ,, the amount of current of the drive current Idr is substantially equal to the amount of current on the current path. At this time, since the impedance value of the resistor R4 is high, only a small portion of the current 14 flows through the current path P4. Only a small driving current Idr drives the LED module 2i, so that the LEDs D1 to D3 can emit low-intensity light. It is worth mentioning that in FIG. 4A, although the driving current Idr and the currents 13, 14 flow in the clockwise direction to the AC power supply Vac, the driving current Idr and the currents 13, 14 may also flow in the counterclockwise direction to the AC power source. Vac. Further, the flow direction of the drive current Idr and the currents 13, 14 differs depending on the polarity of the output voltage of the AC power supply Vac. Fig. 4A is only schematically shown. Similar to the first embodiment, in the present embodiment, by using the high-impedance impedance unit 422, the LEDs D1 to D3 can be made to have good brightness without affecting the high-intensity performance of the LEDs D1 to D3. effect. Therefore, the display of the light source device 4A of the present embodiment can exhibit a good dark state and a bright state, thereby achieving a high dynamic contrast effect 15 M410424 ^0-5-6. In addition, in this embodiment, by using the conventional linear dimmer β, the volume of the impedance unit milk can be used, so that the circuit can be driven (4), thereby effectively reducing the volume of the device 400. Yi Meng, Fig. 4Β is a schematic diagram of another embodiment of the impedance unit of Fig. 4 . Please refer to FIG. 4Α and FIG. 4Β simultaneously. In the embodiment, the impedance unit 522 further includes a switch Q5 and a switch Q6. The switch Q5 is coupled between the R4 and the LED module 21A, wherein the switch has a control terminal G5' to receive the DC signal Vcc. The switch q6 is connected between the control terminal a _ and the LED module 21 。. The switch Q6 has a control terminal G6' and receives a fault detection signal through the control terminal G6. The body and the S, in the case of the light source device 400, the fault detection signal SFault is usually at a logic low level, and when the light source device 4 fails, such as the switch Q4 or the light-emitting diode D1 , D2 or D3 = damage), the fault detection signal sFault will be converted from the logic low level to the logic level, and the switch q6 will be turned on, which will cause the switch q5 to close. In this way, the first end E7 of the resistor R4 is in a floating state (f〇atin phantom state, so that the power supply V2 can not provide the driving current Idr to the light-emitting two climbing poles f D1~D3 ', so that the light-emitting diode can be completely turned off Module 210. In other words, when the light source device 4 having the impedance unit 522 fails, the light source device 400 is completely turned off, so that the display panel to which the light source device 4 is applied is in a black state, so To achieve the effect of power saving and fault notification. In summary, the driving circuit of the LED of the present invention provides two current paths to the driving current, and the current path of the current circuit is configured with a high 16 100-5-6 polar body. The amount of current, the timing of the drastic reduction of the flow through the light two other aspects, by providing a good contrast between the light and dark. Set and drive the track, the light source is set to be too creative, as has been disclosed in the above example It is not intended to limit the general knowledge in the technical field. In the spirit and scope, when the scope of protection can be changed, the scope of the patent application is bounded by the scope of the patent application. 2A is a schematic view of a light source device according to a first embodiment of the present invention. Fig. 2B is a schematic view showing another embodiment of the impedance unit of Fig. 28. Fig. 3B is a schematic view showing another embodiment of the impedance unit of Fig. 3A. Fig. 4A is a schematic view of a light source device according to a third embodiment of the present invention. Fig. 4B is a view Schematic diagram of another embodiment of the impedance unit of 4A. [Description of main component symbols] 100, 220, 420: drive circuit 17 M410424 100-5-6 200, 300, 400: light source device 110: linear dimmer 120, D1~D3: Light-emitting diode 130: Pulse width modulator D4: Diode 210: Light-emitting diode module 222, 322, 422, 522: Impedance unit A: Node B, C: End point

Vin、V1-V2 :電源Vin, V1-V2: power supply

Vac :交流電源Vac : AC power supply

Idr :驅動電流 P1〜P4、P1’ ：電流路徑 II〜14 :電流 R1〜R4 :電阻 L1 :電感 C1 :電容Idr: drive current P1~P4, P1': current path II~14: current R1~R4: resistance L1: inductance C1: capacitance

El、E3、E5、E7 :第一端 E2、E4、E6、E8 :第二端 Q0、Q1〜Q6、Q1’ ：開關 G卜G6、G1，：控制端 Sc2〜Sc4 :控制訊號 Sid :線性調光訊號 ^Fault * 故障偵測訊號 SpWM · PWM 訊號 Vcc :直流訊號 18El, E3, E5, E7: first end E2, E4, E6, E8: second end Q0, Q1~Q6, Q1': switch G Bu G6, G1,: control end Sc2~Sc4: control signal Sid: linear Dimming signal ^Fault * Fault detection signal SpWM · PWM signal Vcc : DC signal 18

Claims

M410424 100-5-6 六、申請專利範圍： I 一種發光二極體的驅動電路，適於接收一雷以提供一驅動電流給一發光二極體模組，該驅動電路’勺、括· -第-電流路徑，包括—第—開關，該第於該發光二極體模組與一端點之間，該第一開關具第一控制端，並透過該第一控制端接收一控制訊號，控制該發光二極體模組是否透過該第一開關耦u 點；以及一第二電流路徑，耦接於該發光二極體模組與該端點之間，該第二電流路徑包括一阻抗單元，且該第二電流路徑與該第一電流路徑並聯耦接。 2，如申請專利範圍第1項所述之驅動電路，其中該阻抗單元包括一第一電阻。 3·如申請專利範圍第2項所述之驅動電路，其中該第一電阻之阻抗值的範圍為一百萬至五千萬歐姆。 4. 如申請專利範圍第2項所述之驅動電路，其中該端點為一接地端。 5. 如申請專利範圍第4項所述之驅動電路，其中該第一電阻的一第一端與該第一電流路徑搞接，且該第一電阻的一第二端耦接至該接地端。 6. 如申請專利範圍第4頊所述之驅動電路，其中該阻抗單元更包括：一第二開關，耦接於該第一電阻與該接地端之間，該第二開關具有一第二控制端，ϋ透過該第二控制端接收一直流訊號；以及 19 100-5-6 Μ，诗開關，耦捿於該第二控制端與該接地端之二開關具有—第三控制端，並透過該第三控制 ^接收〜故障_喊。 1 一如申請專利範圍第4項所述之驅動電路，其中 Ϊ該更包括-第二電阻，接於該第-開關 ^如申請專利範圍第7項所述之驅動電路，更包一極體，耦接於該電源與該第一開關之間。 9.如申請專利範圍第8項所述之驅動電路，其中 =第一電流路徑更包括—電感，減於該二極體與^ 谷之間。、电 ^ 1〇.如申請專利範圍第1項所述之驅動電路，其 =電源為-交流電源，⑽端點為該交流電源之一^，開關與雜抗單^並聯祕於該交二極體模組之間。先 11. 如申請專利範圍第10項所述之驅動電路，复 5亥阻抗單元包括一第三電阻。 ' 12. 如申請專利範圍第U項所述之驅動電路，复該阻抗單元更包括： /、τ 一第四開關，姑於該第三電阻與該發光二極體模組之間，其中該第四開關具有一第四控制端，並透過該第四控制端接收一直流訊號；以及一第五開關，耦接於該第四控制端與該發光二極儀模組之間，該第五開關具有一第五控制端，並透過該第五控制端接收一故障偵測訊號。 Λ 13. —種先源裝置，適於接收—電源以提供光源， M410424 100-5-6 該光源裝置包括： ’ f ,-->···. 一發光二極體模組；以及一驅動電路，耦接該發光_ ^ x元一極體椟組，適於接收該包原以柃供一驅動電流給該發路包括：知尤一極體模組，該驅動電 ♦ 關餘路徑’包括n關，該第一開 ίΓΐ體模組與一端點之間，該第-開 :有：第—控制端’ ii透過該第一控制端接收一控制滅’啸制該發光二靖模一開_接該端點；以及㈣㈣弟 -第二電流路徑，耗接於該發光二極體模植斑，點之間，該第二電流路徑包括—阻抗單元，I 该第二電流路徑與該第一電流路徑並聯輕接。 ;如申請專利範圍第13項所述之光源裝置， s亥阻抗單元包括一第一電阻。 ’、 15·如申請專利範圍帛14項所述之*源裝置，該第-電阻之阻抗值的範圍為一百萬至五千萬歐姆:、 16.如申請專利範圍第14項所述之光源裴置，豆該端點為"接地端。 —17.如申請專利範圍第16項所述之光源裝置，其中該第一電阻的一第一端與該第一電流路徑耦接，且^第一電阻的一第二端耦接至該接地端。 18.如申請專利範圍第16項所述之光源裝置，苴該阻抗單元更包括： ” 一第二開關，耦接於該第一電阻與該接地端之間， 21 M410424 ^ V l‘00-5_6 :，該第二開關具有一第二控制端’並透過該第一控制端接收一直流訊號；以及一第三開關，輕接於該第二控制端與該接地端之間，該第三開關具有一第三控制端，益透過該第三控制端接收一故障偵測訊號。 19. 如申請專利範圍第16項所述之光源裝置，其中該第一電流路徑更包括一第二電阻，柄接於該第一開關與該接地端之間。 20. 如申請專利範圍第19項所述之光源裝置，更包括一二極體’耦接於該電源與該第一開關之間。 .21·如申請專利範圍第2〇項所述之光源裝置，其中該第一電流路彳f更包括一電感，耦接於該二極體與一電容之間。 . 22. 如申請專利範圍第13項所述之光源裝置，其中該電源為一交流電源、，且該端點為該交流電源之一端，第一開關與該阻抗單元並聯耦接於該交流電源與該發光二極體模組之間。 23. 如申請專利範圍第22項所述之光源裝置，其中該阻抗單元包括一第三電阻。 24. 如申請專利範圍第23項所述之光源裝置，其中該阻抗單元更包括：一第四開關’耦接於該第三電阻與該發光二極體模組之間，其中3亥第四開關具有一第四控制端，並透過該第四控制端接收一直流訊號；以及 ^ 一第五開關，耦接於該第四控制端與該發光二極體模組之間，s亥第五開關具有一第五控制端，並透過該第五控制端接收一故障偵測訊號。 22 M410424 100-5-6 the LED module and a terminal. The switch has a control terminal and receives a control signal through the control terminal so as to control whether the LED module is coupled to the terminal via the switch. The second current path is coupled between the LED module and the terminal. The second current path includes an impedance unit and is coupled to the first current path in parallel. 四、指定代表圖： (一）本案之指定代表圖：圖2A (二）本代表圖之元件符號簡單說明： 200 :光源裝置 210 :發光二極體模組 220 :驅動電路 222 :阻抗單元 B :端點 VI :電源 Idr :驅動電流 D1〜D3 :發光二極體 P1〜P2 :電流路徑 II〜12 :電流 R2〜R3 :電阻 E1 :第一端 E2 :第二端 Q1 :開關 G1 :控制端 Sc2 :控制訊號M410424 100-5-6 VI. Patent Application Range: I A driving circuit for a light-emitting diode, suitable for receiving a lightning to provide a driving current to a light-emitting diode module, the driving circuit 'spoon, including · The first current path includes a first switch, and the first switch has a first control end, and receives a control signal through the first control end, and controls Whether the LED module is coupled to the U through the first switch; and a second current path coupled between the LED module and the terminal, the second current path including an impedance unit And the second current path is coupled in parallel with the first current path. 2. The driving circuit of claim 1, wherein the impedance unit comprises a first resistor. 3. The driving circuit of claim 2, wherein the impedance of the first resistor ranges from one million to fifty million ohms. 4. The driving circuit of claim 2, wherein the end point is a ground. 5. The driving circuit of claim 4, wherein a first end of the first resistor is coupled to the first current path, and a second end of the first resistor is coupled to the ground end . 6. The driving circuit of claim 4, wherein the impedance unit further comprises: a second switch coupled between the first resistor and the ground, the second switch having a second control The second control terminal receives the DC signal through the second control terminal; and the 19 100-5-6 Μ, the poem switch is coupled to the second control terminal and the second switch of the ground terminal has a third control terminal, and transmits The third control ^ receives ~ fault _ shout. [1] The driving circuit of claim 4, wherein the driving circuit further includes a second resistor, and the driving circuit is connected to the first switch, as described in claim 7, and further includes a pole body And coupled between the power source and the first switch. 9. The driving circuit of claim 8, wherein the first current path further comprises an inductance, less than between the diode and the valley. ^1〇. For the driving circuit described in the first paragraph of the patent scope, the = power supply is - AC power, (10) the end point is one of the AC power supply ^, the switch and the hybrid resistance single ^ parallel secret to the second Between the pole body modules. First, as in the driving circuit of claim 10, the complex impedance unit includes a third resistor. 12. The driving circuit of claim U, wherein the impedance unit further comprises: /, τ a fourth switch between the third resistor and the LED module, wherein the The fourth switch has a fourth control terminal, and receives the DC signal through the fourth control terminal; and a fifth switch coupled between the fourth control terminal and the LED module, the fifth The switch has a fifth control terminal and receives a fault detection signal through the fifth control terminal. Λ 13. A pre-source device suitable for receiving-power supply to provide a light source, M410424 100-5-6 The light source device comprises: 'f,-->···. a light-emitting diode module; The driving circuit is coupled to the illuminating group, and is adapted to receive the package to provide a driving current to the transmitting circuit, including: a phantom module, the driving circuit 'including n off, between the first open body module and an end point, the first-open: there: the first - control end ii through the first control end receives a control to extinguish the whistle of the illumination The first current path is connected to the light-emitting diode, and the second current path includes an impedance unit, and the second current path is coupled to the second current path. The first current path is connected in parallel. The light source device of claim 13, wherein the s-impedance unit comprises a first resistor. ', 15 · As claimed in the patent scope 帛 14 * source device, the impedance value of the first-resistance ranges from 1 million to 50 million ohms: 16. as described in claim 14 The light source is set, and the end point of the bean is "ground. The light source device of claim 16, wherein a first end of the first resistor is coupled to the first current path, and a second end of the first resistor is coupled to the ground end. 18. The light source device of claim 16, wherein the impedance unit further comprises: a second switch coupled between the first resistor and the ground, 21 M410424 ^ V l'00- 5_6: The second switch has a second control end and receives a DC signal through the first control terminal; and a third switch is lightly connected between the second control terminal and the ground terminal, the third The switch has a third control terminal for receiving a fault detection signal through the third control terminal. The light source device of claim 16, wherein the first current path further comprises a second resistor. The illuminating device is connected between the first switch and the grounding end. The light source device of claim 19, further comprising a diode 'coupled between the power source and the first switch. The light source device of claim 2, wherein the first current path 更f further comprises an inductor coupled between the diode and a capacitor. The light source device of item 13, wherein the power source is one a power source, and the terminal is one end of the AC power source, and the first switch and the impedance unit are coupled in parallel between the AC power source and the LED module. 23. According to claim 22 The light source device, wherein the impedance unit comprises a third resistor. The light source device of claim 23, wherein the impedance unit further comprises: a fourth switch 'coupled to the third resistor and Between the LED modules, wherein the fourth switch has a fourth control terminal, and receives the DC signal through the fourth control terminal; and a fifth switch coupled to the fourth control terminal Between the LED module and the LED module, the fifth switch has a fifth control terminal, and receives a fault detection signal through the fifth control terminal. 22 M410424 100-5-6 the LED module and a terminal The switch has a control terminal and receives a control signal through the control terminal so as to control whether the LED module is coupled to the terminal via the switch. The second current path is coupled betw The second current path includes an impedance unit and is coupled to the first current path in parallel. 4. The designated representative figure: (1) The designated representative figure of the case: Figure 2A (2) Brief description of the component symbols: 200: Light source device 210: Light-emitting diode module 220: Driving circuit 222: Impedance unit B: End point VI: Power supply Idr: Driving current D1 to D3: Light-emitting diodes P1 to P2: Current Path II~12: Current R2~R3: Resistor E1: First end E2: Second end Q1: Switch G1: Control terminal Sc2: Control signal