1259029 五、發明說明α) 【發明所屬之技術領域】 本創作係為一種驅動電路，特別係指一種發光二極體 控制電路。 【先前技術】 發光二極體（Low Emitting Diode，簡稱LED)是一種 將電能轉換為光能的固體電致發光（EL)器件，LED已經 成為半導體領域新崛起的研究熱點和經濟生長點，其在大 螢幕顯示、交通信號燈和儀器儀錶指示等領域得到廣泛應 用，並隨著家用電器進入人們的生活。近幾年，LED半導 體發光技術取得了突飛猛進的發展，各種高效率、高穩定 的發光二極體被廣泛投入應用。發光二極體模組及其驅動 電路也是L E D顯不幕的主要部分’是決定屏體質置的關 鍵。 LED專用驅動晶片的出現，使得顯示和驅動做成一體 化模組成為可能。習知的發光二極體驅動電路都是針對每 一路線路而設置一套驅動，控制個發光二極體之電路 圖，如「第1圖」所示，控制單元2 0 0通過一個開關電晶體 就可以控制發光二極體1 0 0的放光狀態。如果有多個放光 二極體則驅動電路圖如「第2圖」所示，發光二極體A與發 光二極體B需要兩個驅動電路，分別連接控制單元2 0 1及控 制單元2 0 2。如果存在多個LED則需要多個這樣的電路，這 樣會導致整個顯示電路結構相當複雜，驅動電路的利用率 也較低。由於驅動電路的連線及接插件端子數目繁多，使 整體電路的佔用的空間較大，同時生產工藝及製造成本也1259029 V. INSTRUCTION DESCRIPTION α) [Technical Field to Be Invented] The present invention is a driving circuit, and particularly refers to a light emitting diode control circuit. [Prior Art] Low Emitting Diode (LED) is a solid electroluminescent (EL) device that converts electrical energy into light energy. LED has become a new research hotspot and economic growth point in the semiconductor field. It is widely used in large screen displays, traffic lights and instrumentation indicators, and with the entry of household appliances into people's lives. In recent years, LED semiconductor light-emitting technology has made rapid progress, and various high-efficiency, high-stability light-emitting diodes have been widely used. The LED module and its driver circuit are also the main part of the L E D display, which is the key to determining the quality of the screen. The advent of LED-specific driver chips has made it possible to display and drive integrated modules. The conventional LED driving circuit is provided with a set of driving for each line to control the circuit diagram of the LED. As shown in FIG. 1, the control unit 200 passes through a switching transistor. The light emitting state of the light emitting diode 100 can be controlled. If there are multiple light-emitting diodes, the driving circuit diagram is as shown in "Fig. 2". The light-emitting diode A and the light-emitting diode B require two driving circuits, which are respectively connected to the control unit 2 0 1 and the control unit 2 0 2 . If there are multiple LEDs, multiple such circuits are required, which results in a rather complicated structure of the entire display circuit and a low utilization of the driving circuit. Due to the large number of wirings and connector terminals of the driving circuit, the overall circuit occupies a large space, and the production process and manufacturing cost are also
1259029 五、發明說明（2) 相應提高。 因此如何減少發光二極體電路的分立元件以及連線， 從而降低生產成本，減化了生產工藝及所占空間是當前半 導體領域亟待解決的問題。 【發明内容】 有鑒於此，本創作乃為解決上述問題而提出一種發光 二極體驅動電路，主要的目的在於以一驅動電路控制多個 發光二極體之發光狀態，從而節約電路製造成本。 所以為達上述目的，本創作提供一種發光二極體驅動 電路，用以通過一條驅動控制電路控制複數個發光二極體 之發光狀態，包括：一控制單元，用以發出驅動控制信 號；一第一推挽（pushpull)式驅動電路，其由第一電晶 體Q1以及第二電晶體Q2串聯組成；一第二推挽式驅動電 路，與該第一推挽式驅動電路並聯，由第三電晶體Q 3以及 第四電晶體Q 4串聯組成；以及一發光二極體電路，其連接 於該第一電晶體Q1與該第二電晶體Q2的公共端R+以及該 第三電晶體Q3與該第四電晶體Q4的公共端R-之間，由兩組 方向相反的該發光二極體並聯組成。其中，在該驅動控制 信號的作用下，該第一電晶體Q 1與該第四電晶體Q4組成的 電路，與該第二電晶體Q 2與該第三電晶體Q 3組成的電路交 替導通，使該發光二極體電路產生電壓降，從而使正向連 接的一組該發光二極體發光。 根據本發明所提之發光二極體驅動電路，減少了驅動 電路的個數，從而減小了分立元件和連線的個數，這不僅1259029 V. Description of invention (2) Correspondingly improved. Therefore, how to reduce the discrete components and wiring of the LED circuit, thereby reducing the production cost, reducing the production process and occupying space is an urgent problem to be solved in the current semiconductor field. SUMMARY OF THE INVENTION In view of the above, the present invention proposes a light-emitting diode driving circuit for solving the above problems, and the main object is to control the light-emitting state of a plurality of light-emitting diodes by a driving circuit, thereby saving circuit manufacturing cost. Therefore, in order to achieve the above object, the present invention provides a light emitting diode driving circuit for controlling the light emitting state of a plurality of light emitting diodes through a driving control circuit, comprising: a control unit for issuing a driving control signal; a push-pull type driving circuit, which is composed of a first transistor Q1 and a second transistor Q2 connected in series; a second push-pull driving circuit is connected in parallel with the first push-pull driving circuit, and is connected to the third The crystal Q 3 and the fourth transistor Q 4 are formed in series; and a light emitting diode circuit connected to the common terminal R+ of the first transistor Q1 and the second transistor Q2 and the third transistor Q3 Between the common ends R- of the fourth transistor Q4, two sets of oppositely directed light emitting diodes are connected in parallel. The circuit composed of the first transistor Q 1 and the fourth transistor Q4 and the circuit composed of the second transistor Q 2 and the third transistor Q 3 are alternately turned on by the driving control signal. The light-emitting diode circuit is caused to generate a voltage drop, thereby causing a pair of the light-emitting diodes connected in the forward direction to emit light. According to the LED driving circuit of the present invention, the number of driving circuits is reduced, thereby reducing the number of discrete components and wiring, which is not only
1259029 五、發明說明（3) 減化了生產工藝和安裝調試，還有效的避免了各種侵蝕性 氣體對LED引線及插接件的腐蝕，提高了可靠性和可維護 性，大大降低系統的成本。 有關本創作之詳細内容及技術，茲就配合圖式說明如 下： 【實施方式】 首先由「第3圖」中說明本創作的系統，該圖係本創 作所提之發光二極體驅動電路圖，如圖所示，第一推挽 (pushpul 1)式驅動電路3 0 0與第二推挽式驅動電路4 0 0之 間連接有發光二極體電路5 0 0，兩推挽式驅動電路分別與 控制單元2 0 0相連，接受控制單元2 0 0發出的控制信號，從 而控制發光二極體A以及發光二極體B之發光狀態。本創作 充分利用了發光二極體的單向導電之特性，來減少控制發 光設備開關的線路，發光二極體A以及發光二極體B為反向 並接。在不需要同時亮的情況下，只需通過電源線VDD至 G N D的變化來達到所剩的三種狀態，即二極體A，B只有一 個亮，和兩個二極體都不亮，而不需要控制線，從而簡化 了線路。第一推挽（p u s h p u 1 1)式驅動電路3 0 0，由開關 電晶體Q1以及Q2串聯組成，其中Q1為PNP型電晶體，Q2為 NPN型電晶體，其串聯的公共端為R+。第二推挽式驅動電 路4 0 0與第一推挽式驅動電路3 0 0並聯，由開關電晶體Q3以 及Q4串聯組成，Q3為PNP型電晶體，Q4為NPN型電晶體，串 聯的公共端為R -。，在公共端R +與公共端R -之間，連接有 發光二極體電路5 0 0，由兩組方向相反的發光二極體A以及1259029 V. Description of invention (3) Reduced production process and installation and debugging, and effectively avoided corrosion of LED leads and connectors by various aggressive gases, improved reliability and maintainability, and greatly reduced system cost. . The details and technology of this creation are described as follows: [Embodiment] First, the system of the creation is described in "3rd picture", which is a driving circuit diagram of the LED driving body proposed by the present invention. As shown in the figure, a light-emitting diode circuit 500 is connected between a first push-pull type driving circuit 300 and a second push-pull driving circuit 400, and two push-pull driving circuits respectively It is connected to the control unit 200, and receives a control signal from the control unit 2000 to control the light-emitting state of the light-emitting diode A and the light-emitting diode B. This creation makes full use of the unidirectional conduction characteristics of the light-emitting diode to reduce the line for controlling the switch of the light-emitting device, and the light-emitting diode A and the light-emitting diode B are connected in reverse. In the case that it is not required to be bright at the same time, only the change of the power line VDD to GND is used to reach the remaining three states, that is, the diodes A, B are only one bright, and the two diodes are not bright, and A control line is needed to simplify the line. The first push-pull (p u s h p u 1 1) type driving circuit 300 is composed of a series of switching transistors Q1 and Q2, wherein Q1 is a PNP type transistor, Q2 is an NPN type transistor, and the common terminal of the series is R+. The second push-pull driving circuit 400 is connected in parallel with the first push-pull driving circuit 300, and is composed of a series of switching transistors Q3 and Q4, Q3 is a PNP type transistor, and Q4 is an NPN type transistor. The end is R -. Between the common terminal R + and the common terminal R -, a light-emitting diode circuit 500 is connected, and two sets of opposite-direction light-emitting diodes A and
1259029 五、發明說明（4) 务光二極體B並聯組成，+ ^ ^ 黾路中還包括一限流電阻R ’以及 可=電阻!!㈧用以控制發光二極體的亮度。 §控制單兀2 0 0發出的控制信號LED —OUT —R+為高電 、’甩晶體Q2導通，Ql截止，此時LED_0UT_R-為低電平， 電晶體Q3導通，Q4截丨卜 门 — ~ ^ ^ 、 ^ m止，因此電流由Q3通過發光二極體電 路流向Q 2，發光二極辦r > β中有正向電流通過，因此發光二 極體Β發光，Α截止。 同理當LED — OUT —R+為低電平時，電晶體Qi導通，⑽截 止二此時LED —0UT — R-為高電平，電晶體Q4導通，㈧截止， 此日寸公共知R+的電位高於公共端R—的電位，發光二極體A 發光，B截止。 在電路中開關電晶體Q1與Q4具有相同的開關狀態，Q2 與Q3具有相同的開關狀態，當“與Q4導通時，以與⑽同時 截止’相反當Q2與Q3導通時，〇丨與〇4同時截止，從而可根 ^该驅動控制信號交替導通，在該發光二極體電路產生電 壓降，從而使正向連接的發光二極體發光。 請參見「第4圖」，該圖係本創作實施例之電路圖， 如圖所示，包括有四推挽式驅動電路：Q 1，Q 5丨4，R 5 2 2， R5 2 0組成第一推挽式驅動電路由控制信號led_0UT_R+控 制·’ Q2’ Q515’ R523’ R524組成第二推挽式驅動電路由控 制信號 LED —OUT —R-控制；Q3，Q516，R5 2 5，R521組成第三 推挽式驅動電路由控制信號LED —0UT_L+控制；Q4，Q5 1 7， R 5 2 9，R 5 2 6組成第四推挽式驅動電路由控制信號 LED —0UT_L-控制。圖中還包括有兩組發光二極體D518，1259029 V. Invention description (4) The light-emitting diode B is composed in parallel, and the + ^ ^ circuit also includes a current-limiting resistor R ’ and a resistor = !! (8) to control the brightness of the light-emitting diode. § Control signal LED2 0 0 issued control signal LED —OUT —R+ is high, '甩 crystal Q2 is on, Ql is off, LED_0UT_R- is low, transistor Q3 is on, Q4 is intercepted~~ ^ ^ , ^ m stop, so the current flows from Q3 through the light-emitting diode circuit to Q 2, and the light-emitting diodes have a forward current passing through it, so that the light-emitting diode emits light and turns off. Similarly, when LED — OUT — R+ is low level, transistor Qi is turned on, (10) is turned off. At this time, LED —0UT — R— is high level, transistor Q4 is turned on, (8) is turned off, and the potential of R+ is high. At the potential of the common terminal R-, the light-emitting diode A emits light, and B is turned off. In the circuit, the switching transistors Q1 and Q4 have the same switching state, and Q2 and Q3 have the same switching state. When "when Q4 is turned on, it is turned off simultaneously with (10)". When Q2 and Q3 are turned on, 〇丨 and 〇4 At the same time, the driving control signal is alternately turned on, and a voltage drop is generated in the LED circuit, thereby causing the forward-connected LED to emit light. Please refer to "Fig. 4", which is the creation of the picture. The circuit diagram of the embodiment, as shown, includes four push-pull drive circuits: Q 1, Q 5 丨 4, R 5 2 2, R5 2 0 constitute the first push-pull drive circuit controlled by the control signal led_0UT_R+ Q2' Q515' R523' R524 constitutes the second push-pull drive circuit controlled by the control signal LED —OUT —R-; Q3, Q516, R5 2 5, R521 constitutes the third push-pull drive circuit controlled by the control signal LED —0UT_L+ ; Q4, Q5 1 7, R 5 2 9, R 5 2 6 The fourth push-pull drive circuit is controlled by the control signal LED_OUT_L. The figure also includes two sets of LEDs D518.
第9頁 1259029 五、發明說明（5) D515，D5 2 0，D521為發光二極體電路510，由第一，第二 推挽式驅動電路驅動；D522，D516，D517，D519為發光 二極體電路5 2 0 ’由第三，第四推挽式驅動電路驅 動。R5 3 3，R5 3 2為限流電阻，VR5 01用來調整LED的亮度。 當LED —OUT —R+高電平LED —0UT —R—低電平時，電流方向 為由R -到R+’發光二極體電路510中的上面一半led發光， 當LED_0UT_R+低電平LED_〇UT_R—高電平時，電流方向為由 R+到發光二極體電路510的下面一半UD發光。發光二極 體電路5 2 0與發光二極體電路51〇的工作方法相同。從而使 相反方向的兩組發光二極體交替導通。 用以：i=以前述之較佳實施例揭露如上，然其並非 ，熟悉此技藝者，在不脫離本創作 之：護r二·可作些許之更動與潤•，因此本創作 之保4耗圍s視後附之申請專利範圍所界定者為准。Page 9 1259029 V. Description of the invention (5) D515, D5 2 0, D521 is a light-emitting diode circuit 510, driven by the first and second push-pull driving circuits; D522, D516, D517, D519 are light-emitting diodes The body circuit 5 2 0 ' is driven by the third, fourth push-pull drive circuit. R5 3 3, R5 3 2 are current limiting resistors, VR5 01 is used to adjust the brightness of the LED. When the LED —OUT —R+high level LED —0UT —R—low level, the current direction is led by the upper half of the LED in the R − to R+′ LED circuit 510, when LED_0UT_R+low level LED_〇UT_R - At a high level, the current direction is from R+ to the lower half of the UD of the LED circuit 510. The light-emitting diode circuit 52 is operated in the same manner as the light-emitting diode circuit 51A. Thereby, the two groups of LEDs in the opposite direction are alternately turned on. It is used to: i = in the above preferred embodiment to disclose the above, but it is not, those skilled in the art, without departing from the creation: the protection of the second, can make some changes and run ·, therefore the protection of this creation 4 The consumption s is subject to the definition of the scope of the patent application attached.
第10頁 1259029 圖式簡單說明 第1圖係習知控制電路中控制一個發光二極體之電路圖； 第2圖係習知控制電路中控制多個發光二極體之電路圖； 第3圖係本創作所提之發光二極體驅動電路之電路圖；及 第4圖係本創作實施例之電路圖。 【圖式符號說明】 100 發光二極體 2 0 0 控制單元 201 控制單元 2 0 2 控制單元 3 0 0 第一推挽式驅動電路 4 0 0 第二推挽式驅動電路 5 0 0 發光二極體電路 VDD 電源 GND 接地端 Q1 開關電晶體 Q2 開關電晶體 Q3 開關電晶體 Q4 開關電晶體 R 限流電阻 R0 可變電阻 R + 公共端 R- 公共端 A 發光二極體 B 發光二極體Page 10 1259029 Brief Description of the Drawings Fig. 1 is a circuit diagram of controlling a light-emitting diode in a conventional control circuit; Figure 2 is a circuit diagram for controlling a plurality of light-emitting diodes in a conventional control circuit; A circuit diagram of the LED driving circuit of the present invention is created; and FIG. 4 is a circuit diagram of the present embodiment. [Description of Symbols] 100 Light Emitting Diode 2 0 0 Control Unit 201 Control Unit 2 0 2 Control Unit 3 0 0 First Push-Pull Drive Circuit 4 0 0 Second Push-Pull Drive Circuit 5 0 0 Illuminated Dipole Body circuit VDD Power supply GND Ground terminal Q1 Switching transistor Q2 Switching transistor Q3 Switching transistor Q4 Switching transistor R Current limiting resistor R0 Variable resistor R + Common terminal R- Common terminal A Light-emitting diode B Light-emitting diode
1259029 圖式簡單說明 510 發光二極體電路 5 2 0 發光二極體電路 第12頁 111·!1259029 Brief description of the diagram 510 LED circuit 5 2 0 LED circuit Page 12 111·!