JP2006259669A - Driving device of cluster lamp dot beam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device which drives and emits a cluster lamp dot beam consisting of a plurality of light emitting diodes. <P>SOLUTION: This invention relates to the driving device of the cluster lamp dot beam which drives a plurality of emission elements in one cluster lamp dot beam by viewing and listening signal data. The driving device of the cluster lamp dot beam receives the viewing and listening signal data transmitted from a control system by a controller, divides the viewing and listening signal data into three pieces of sub-viewing and listening signal data and simultaneously and repeatedly outputs the three pieces of sub-viewing and listening signal data to a digital/analog converter by every fixed time. The digital/analog converter converts the three pieces of sub-viewing and listening signal data into three pieces of analog voltage and outputs the analog voltage to a voltage/current converter. The voltage/current converter converts, outputs the three pieces of analog voltage into three pieces of analog current, drives the emission elements to emit light. The driving device drives the cluster lamp dot beam consisting of the plurality of light emitting diodes, generates luminance according to variation of an amount of current and generates variation of many kinds of colors and patterns according to the control system. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a driving device for driving a cluster lamp dot beam composed of a plurality of light emitting diodes to emit light.

  A light-emitting diode (LED) is a light-emitting element made of a semiconductor material, and the element has two terminals, a voltage is applied between these terminals to flow a very small current, and internal electrons and holes Excess energy is excited and released in the form of light by the combination of the above, which is the basic light emission principle of the light emitting diode LED.

  Unlike ordinary incandescent lamps, light-emitting diode LEDs are cold-emitting, have low power consumption, long device life, no time to warm the lamp, fast reaction speed, etc. In addition to being suitable for mass production, it is extremely small or easy to fabricate into an array type element. At present, the light-emitting diode LED is widely used in indicators and display devices of information communication and consumer electronic products, and is an important element indispensable for daily life.

  Light-emitting diode LEDs are mainly applied to traffic signals, vehicle instruction lamps, brake lamps, etc., and full-color light-emitting diode LEDs are applied to displays consisting of red, green, and blue primary-color light-emitting diodes. Widely applied to the above advertising billboards. In addition, with the spread of mobile phones or other portable electronic products, the light-emitting diode LED has become an indispensable light-emitting device, and the light-emitting diode LED has a small volume, a high lighting speed and a long life. Due to the advantages, some illumination light sources can be changed in the future.

  Since the application of the light-emitting diode LED is already widespread, drive chips for various drive circuits have been developed accordingly. FIG. 1 is a diagram showing voltage and current characteristics of a general diode. Except for a specific application, a diode normally operates at a positive voltage, and the relationship between the voltage and current is depicted by the index e. The voltage at both ends of the diode is a certain voltage Vf (generally referred to as starting voltage or conduction voltage, and its value is in the range of 0.5 to 0.8 V. This value depends on the composition material of the diode and the impurity doping concentration. The diode current increases rapidly, and the current to turn on the diode before this start-up voltage is very small. The characteristics of the light-emitting diode are the same as general diodes. Can receive visible light.

  A light emitting diode LED is usually made of arsenic gallium phosphide or gallium phosphide, and when the material used for manufacture is different, the wavelength of the emitted light is different and, of course, the color is also different. For example, gallium arsenide phosphide emits red light and gallium phosphide is between yellow and green. The intensity (lumen) of light emitted from the light emitting diode is directly proportional to the conduction current. As shown in FIG. 2, the relationship between the intensity (lumen) of a general light emitting diode and the conduction current in the forward direction is shown. Show. Therefore, in actual application, in order to drive the circuit while maintaining a constant luminance, it is generally provided with a fixed current drive. In this way, the service life of the light emitting diode LED is extended.

  The drive device of the present invention is mainly intended to drive a cluster lamp dot beam composed of a plurality of light emitting diodes by a voltage input and current output method, and generate luminance by changing the amount of current. At the same time, in accordance with the control system, a plurality of driving devices can drive a plurality of cluster lamp dot beams to generate various color and pattern changes.

  The driving device of the present invention drives and emits a plurality of light emitting elements in one cluster lamp dot beam by viewing signal data transmitted from the control system, and the driving device receives the viewing signal data with a controller, The viewing signal data is divided into three sub viewing signal data, and the three sub viewing signal data are repeatedly output to the digital / analog converter every fixed time. The digital / analog converter converts the three sub-viewing signal data into three analog voltages and outputs them to the voltage / current converter. The voltage / current converter converts and outputs three analog voltages into three analog currents, and drives, changes, and emits these light emitting elements.

  The foregoing summary and the following description are both exemplary, and are intended to further illustrate the scope of the claims of the present invention. Other objects and advantages of the present invention will be described in more detail from the subsequent description and drawings.

  FIG. 3 is a block diagram showing a cluster lamp dot beam driving device circuit of the present invention. In this embodiment, driving of three light emitting elements 40 will be described. The driving device drives three light emitting elements 40 of the cluster lamp dot beam 4 by viewing signal data, receives the viewing signal data, and divides the viewing signal data into three sub viewing signal data; Connected to the controller 10 respectively, three digital / analog converters 20 that convert three sub-viewing signal data into three analog voltages and output them, and correspond to these digital / analog converters 20 and the cluster lamp dot beam 4 respectively. And three voltage / current converters 30 that convert and output three analog voltages into three analog currents and drive these light emitting elements 40 to emit light.

  The controller 10 repeatedly transmits the three sub-viewing signal data to these digital / analog converters 20 every fixed time, and changes the light emission of these light emitting elements 40. The light emitting element 40 is configured by connecting at least one light emitting diode LED, and the cluster lamp dot beam 4 described above includes at least one series connected red light emitting diode, at least one series connected green light emitting diode, and at least one. The voltage-current converter 30 is a mutual conduction amplifier.

  FIG. 4 is a block diagram showing a controller circuit used by the present invention. Referring to FIG. 4 in conjunction with FIG. 3, the controller 10 receives the viewing signal data transmitted from the control system (not shown) through the external serial interface 102 of the serial data transmission method. The viewing signal data is divided into three sub viewing signal data (according to the combination of three primary colors such as red, green, and blue, and the use of light harmony) from the serial / parallel conversion unit 104 connected to the external serial interface 102 and output. . The three data latch units 106 are connected to the serial / parallel conversion unit 104 for receiving and latching the three sub-viewing signal data, respectively. The parallel / serial conversion unit 108 is connected to the three data latch units 106 and converts the latched three sub-viewing signal data into serial data and outputs the serial data. At the same time, the parallel / serial conversion unit 108 provides a scanning function and repeatedly outputs the sub viewing signal data on the data latch unit 106 at fixed time intervals. The present invention uses a serial data transmission scheme to reduce electromagnetic noise sources and failure rates.

  FIG. 5 is a block diagram showing a digital / analog converter circuit used in the present invention. Referring to FIG. 5 in conjunction with FIG. 3, the digital / analog converter 20 has a serial / parallel conversion unit 202 connected to the controller 10, and acquires one serial sub-viewing signal data output from the controller 10. , Convert to parallel data and output. At the same time, the digital / analog converter 20 uses the conversion circuit 204 connected to the serial / parallel conversion unit 202, receives the parallel sub-viewing signal data, converts it into an analog voltage, and outputs it.

  As described above, the digital / analog converter 20 further includes the output buffer unit 206 connected to the conversion circuit 204, which is used as the buffer output of the analog voltage. FIG. 6 is a block diagram showing a voltage / current converter circuit of the present invention. Referring to FIG. 6, the voltage / current converter 30 includes a current driving unit 304 that is recurrently connected to the amplification control unit 302, and the recurrent network can reduce the influence due to the amplification difference of the current driving unit 304. The amplification control unit 302 is connected to the output buffer unit 206 of the digital / analog converter 20 to amplify and output the analog voltage. The amplified analog voltage is transmitted to the current driving unit 304 to output an analog current with an equal ratio. The analog current drives the light emission of the light emitting diode 402 in the light emitting element 40. The luminance of the light emitting diode 402 is controlled by the analog current output from the voltage / current converter 30 and the fixed drive voltage VLED.

  In the above description, the present invention drives a cluster lamp dot beam composed of a plurality of light emitting diodes by a voltage input and current output method, generates different luminances according to changes in the amount of current, and matches a control system with a plurality of drive devices. Can drive a plurality of cluster lamp dot beams to generate various color and pattern changes.

  In the driving apparatus of the present invention, the viewing signal data is received by the controller, the viewing signal data is divided into a plurality of sub viewing signal data, and repeatedly output to the digital / analog converter at fixed time intervals. The digital / analog converter converts these sub-viewing signal data into a plurality of analog voltages and outputs them to the voltage / current converter. The voltage / current converter converts these analog voltages into a plurality of analog currents and outputs them, and drives, changes and emits these light emitting elements to achieve a voltage input and current output system, consisting of a plurality of light emitting diodes. A cluster lamp dot beam is driven.

  However, each specific configuration disclosed above is merely a working example of the present invention, and does not limit the features of the present invention. The home can appropriately perform conversions and modifications in the technical field of the present invention, but it goes without saying that such implementation should be delivered within the scope of the present invention.

It is a figure which shows the voltage and electric current characteristic of a general diode. It is a figure which shows the intensity | strength (lumen) of the light of a general light emitting diode, and the related waveform of a conduction current. FIG. It is a block diagram which shows the drive apparatus circuit of the cluster lamp dot beam of this invention. It is a block diagram which shows the controller circuit which this invention uses. It is a block diagram which shows the digital / analog converter circuit which this invention uses. It is a block diagram which shows the voltage-current converter circuit of this invention.

Explanation of symbols

4 cluster lamp dot beam 10 controller 20 digital / analog converter 30 voltage / current converter 40 light emitting element 102 external serial interface 104 serial / parallel conversion unit 106 data latch unit 108 parallel / serial conversion unit 202 serial / parallel conversion unit 204 conversion Circuit 206 output buffer unit 302 amplification control unit 304 current drive unit 402 light-emitting diode VLED fixed drive voltage

Claims (7)

In a cluster lamp dot beam driving apparatus for driving a plurality of light emitting elements in one cluster lamp dot beam by viewing signal data,
A controller that receives the viewing signal data and outputs the viewing signal data divided into three sub viewing signal data;
A digital / analog converter connected to the controller for converting these sub-viewing signal data into a plurality of analog voltages and outputting them;
A voltage / current converter connected to the digital / analog converter and the cluster lamp dot beam, converting and outputting these analog voltages into a plurality of analog currents, driving these light emitting elements to emit light,
The controller transmits the sub-viewing signal data to the digital / analog converter every fixed time, and changes the light emission of these light emitting elements, and drives the cluster lamp dot beam.   2. The cluster lamp dot beam driving device according to claim 1, wherein the light emitting element is constituted by connection of at least one light emitting diode.   The cluster lamp dot beam is configured by connecting in parallel at least one series-connected red light-emitting diode, at least one series-connected green light-emitting diode, and at least one series-connected blue light-emitting diode. Item 2. A cluster lamp dot beam driving apparatus according to Item 1. The controller is
An external serial interface for receiving viewing signal data in a serial data transmission system;
A serial / parallel conversion unit connected to an external serial interface and dividing the viewing signal data into a plurality of sub viewing signal data;
A plurality of data latch units connected to the serial / parallel conversion unit for receiving and latching these sub-viewing signal data respectively;
2. A parallel / serial conversion unit connected to these data latch units and converting the latched sub-viewing signal data into serial data and outputting the serial data, respectively. Drive device. The digital / analog converter is:
A serial / parallel conversion unit connected to the controller and converting the sub-viewing signal data into parallel data and outputting the parallel data;
2. A cluster lamp dot according to claim 1, further comprising a plurality of conversion circuits which are respectively connected to these serial / parallel conversion units and convert the parallel sub-viewing signal data into these analog voltages and output them. Beam drive device.   6. The cluster lamp dot beam driving device according to claim 5, further comprising a plurality of output buffer units connected to the conversion circuit and configured as buffer outputs of analog voltages.   2. The cluster lamp dot beam driving apparatus according to claim 1, wherein the voltage / current converter is an amplifier which conducts mutual conduction.

Images