KR102164233B1 - Lighting device for vehicle using micro led - Google Patents

Abstract

The present invention relates to a vehicle lighting device using micro LEDs, and more particularly, to a vehicle lighting device using micro LEDs that implement direct and indirect lighting by mounting a micro LED to a lamp outside the vehicle.
The vehicle lighting device using the micro LED of the present invention provides driving information of the vehicle through various colors or shapes to pedestrians as well as during driving or stopping test drivers, thereby improving safety accident prevention efficiency.

Description

Lighting device for vehicle using micro LED {Lighting device for vehicle using micro led}

The present invention relates to a vehicle lighting device using micro LEDs, and more particularly, to a vehicle lighting device using micro LEDs that implement direct and indirect lighting by mounting a micro LED to a lamp outside the vehicle.

In general, the lighting device of a vehicle is mainly configured to have a lighting function that enables the driver to see an object illuminated during night driving, and a signal function that informs the driving state of the vehicle in front of the vehicle following from the rear during driving.

That is, the lighting device of such a vehicle is a plurality of lamps respectively installed in the front and rear of the vehicle, and a headlight, a fog lamp, a turn indicator, a brake lamp, and an emergency flashing indicator are installed.

As described above, in conventional vehicles, headlights, fog lights, turn indicators, brake lights, and emergency flashing indicators are installed at the front and rear of the vehicle, respectively, so that lighting is used according to the purpose of vehicle operation, but at night and with a narrow width When the vehicle turns left or right on the road, it is not possible to provide a sufficient illumination view for safe driving to the driver, and there is a limit to transmitting information about the vehicle's operation to pedestrians or moving objects according to the driver's vehicle operation.

Korean Patent Publication No. 10-1745189 discloses a warning notification device for vehicles, but this only transmits external information to the driver, and it has the disadvantage that information about the driver's vehicle operation is not transmitted to pedestrians or moving objects passing around the vehicle. have.

Meanwhile, in general, an LED having a size of 1 to 100 μm in length and width is referred to as a micro LED or a mini LED. To individually drive micro LEDs or mini LEDs, an external LED driving circuit is required, and LED arrays are configured in a matrix method to reduce cost by reducing the number of driving circuits. At this time, the driving of the LED array arranged in the matrix method generally includes a passive matrix method and an active matrix method. In the case of the passive matrix method, compared to the active matrix method, the lighting time of individual LEDs There is a problem that is not suitable to be applied to automobile headlamp modules due to limitations.

In addition, in the recent technology that drives individual LEDs such as adaptive driving beam or adaptive front lighting system, in order to individually drive more than tens of micro LEDs instead of dozens, the conventional method is used. It is difficult to control, and there is a problem in applying it to automobile headlamps due to an increase in the size of the control circuit.

Republic of Korea Patent Publication No. 10-1745189: Vehicle warning notification device

In order to solve the above problems, the present invention facilitates recognition of the vehicle by pedestrians or moving objects as well as the driver, and by implementing a letter or figure in a different light emission color according to the driving information of the vehicle, the pedestrian or moving object moves the vehicle. It is intended to provide a vehicle lighting device using micro LEDs that induces to be predicted.

A vehicle lighting device using micro LEDs to achieve the above object is for providing vehicle operation information to pedestrians, and a micro LED module mounted on the outside of the vehicle or lamp of the vehicle, and detecting pedestrians or moving objects. A detection sensor and a main control unit that turns off the lamp that is being lit by receiving a signal from the detection sensor and controls the lighting of the micro LED module, and an alarm signal to a pedestrian or driver when the micro LED is turned on under the control of the main control unit. The micro LED module includes a notification unit that outputs, and the micro LED module has a driver IC that can be mounted along the curved surface of the lamp or the curved surface of the vehicle, and each has a micrometer size and is mounted on the driver IC to produce different colors according to the driving information. It is characterized in that it includes a light source unit including a plurality of micro LED elements embodying figures or characters to emit light or to facilitate recognition of pedestrians.

The driver IC includes a driving circuit unit including a scan line, a data line, a switching transistor, a driving transistor, and a storage capacitor to control the light source unit in an active matrix driving method, and a scan driver outputting a scan signal to the scan line; A data driver that outputs a data signal to a data line, a communication module that receives a light emission control signal output from the main control unit provided in a vehicle, and the scan driver and the data by receiving a light emission control signal received from the communication module. Each control module for controlling the operation of the driver is built-in, and the micro LED module includes a heat dissipation unit mounted on the rear surface of the driver IC; And an external memory storing control information corresponding to each operation mode to operate the light source unit in a set operation mode.

It is preferable that the heat dissipation unit is installed so that the lower surface of the driver IC is in close contact with the upper surface, and a power supply line for supplying power to the driver IC is connected by wire bonding to the heat dissipation unit and the driver IC.

The vehicle lighting device using the micro LED of the present invention provides driving information of the vehicle through various colors or shapes to pedestrians as well as during driving or stopping test drivers, thereby improving safety accident prevention efficiency.

The vehicle lighting device using the micro LED according to the present invention applies the AM type LED driving circuit, which has a simple structure compared to the conventional PM type LED driving circuit, so that the smallest size driving circuit can be manufactured and applied for automobile headlamps. And, compared to the conventional PM method, by providing a sufficient amount of light, it is possible to implement detailed night lighting and adaptive driving beam (ADB) or variable headlight system (AFLS).

1 is a conceptual diagram of a vehicle lighting device using a micro LED according to an embodiment of the present invention,
2 is a block diagram showing a driving sequence of the vehicle lighting device using the micro LED of FIG. 1,
3 is a block diagram of the micro LED module of FIG. 1,
4 is a block diagram of the micro LED module of FIG. 1,
5 is a diagram showing an example of outputting driving information in text to a pedestrian through the micro LED module of FIG. 1,
6 is a cross-sectional view of the micro LED module of FIG. 1,
7 is a cross-sectional view of a micro LED module according to another embodiment of the present invention.

Hereinafter, a lighting device for a vehicle using micro LEDs according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 4 illustrate a vehicle lighting device using a micro LED according to an embodiment of the present invention.

A vehicle lighting device using micro LED relates to a vehicle lighting device 1 mounted on a vehicle 5 to provide various driving information of the vehicle to pedestrians, and includes a micro LED module 100, a detection sensor 210, and , A main control unit 220, and a notification unit 230.

The micro LED module 100 may be mounted on a tail lamp, a head lamp, or a four-gram lamp in addition to the turn signal lamp of the illustrated vehicle, or may be mounted outside the body of the vehicle 5.

The micro LED module 100 includes a driver IC 110, a light source unit 120 including a plurality of micro LED devices 130, a radiating unit 310 mounted on the rear surface of the driver IC 110, and an external memory. It has 180. The micro LED module 100 may be mounted along a curved surface of a lamp or a curved portion of a vehicle because the driver IC 110 is formed in a very small size, and thus may be mounted in various positions without restriction on the shape of the lamp or vehicle.

The plurality of micro LED devices 130 have a micrometer size and are mounted on the front surface of the driver IC 110 to be arranged to be spaced apart from each other. The plurality of micro LED devices 130 may be formed of any one type of UV LED, blue LED, green LED, red LED, and yellow LED so that various colors can be emitted by the main control unit according to the driving information of the vehicle. . Blue LEDs can be implemented in various colors through phosphors of various colors. The micro LED device that can be used in the present invention may be used without limitation as long as it is a micro LED device generally used for lighting, but preferably, one micro LED device manufactured in a 3lm/11mA class may be applied.

The micro LED module applied to the headlamp is preferably applied to have a light source having a size of about 4mm X 4mm by consisting of 1,024ea microLED devices in a 32x32 array in the driver IC. When such a micro LED module is used, it is possible to mark the vehicle exterior with letters or figures in addition to colors, so that pedestrians can be efficiently informed of vehicle driving information.

In addition, the driver IC 110 includes a scan driver 140 that outputs a scan signal to control the light source unit 120 by an active matrix (AM) driving method, a data driver 150 that outputs a data signal, and a vehicle. The communication module 160 that receives the lamp control signal output from the main control unit 220 provided in the, and the lamp control signal received from the communication module 160 is transmitted to the scan driver 140 and the data driver 150. A control module 170 that controls each operation is incorporated.

The communication module 160 receives the lamp control signal output from the main control unit 220 and transmits it to the control module 170.

The control module 170 receives the lamp control signal received from the communication module 160, that is, the control signal transmitted from the main control unit 220 according to external environmental conditions according to the operation of the vehicle driver during day and night driving, and manipulates the driver. Operations of the scan driver 140 and the data driver 150 are respectively controlled to operate the light source unit 10 corresponding to.

Meanwhile, the external memory 180 stores control information corresponding to each operation mode so as to operate the light source unit 120 in a set operation mode.

Referring to FIG. 4, the control module 170 loads data stored in the external memory 180 or loads data stored in the external memory 180 and a timing controller 171 that controls the blinking timing of each LED of the micro LED array. It includes a memory controller 173 for processing to be stored, and an illuminance controller 175 for setting dimming of the entire micro LED array.

Meanwhile, the control module 170 controls the operation of the light source unit 120 by loading control information from the external memory 180 in which control information corresponding to each operation mode is stored so that the light source unit 120 can be operated in a set operation mode. can do.

A metal thin film is formed on the rear surface of the driver IC 110 to improve heat conduction, and a heat transfer material such as a thermal paste having high thermal conductivity is used between the driver IC 110 and the radiator 310 to improve heat conduction. desirable.

The heat dissipation unit 310 dissipates the light source unit 120 and the driving circuit for driving the light source unit 120 at the same time, and is mounted on the rear surface of the driver IC 110 on which the light source unit 120 is mounted, and the driver IC 110 It is preferably formed to have a larger area.

The heat dissipation unit 310 is not particularly limited as long as it is a material having greater thermal conductivity than outside air. For example, it can be widely used, such as a metal material or carbon material having high thermal conductivity. Here, as a lamination method of the heat sink, a polyimide precursor may be coated on a metal substrate in addition to a deposition method such as a general chemical vapor deposition method and a physical vapor deposition method. In addition, it may be formed by a method such as lamination, casting, or electroless plating as when forming the metallic conductor 210 on the heat dissipation part 310. In addition, in the case of the carbon material, a carbon tape can be used.

Alternatively, the heat dissipation unit 310 may be configured to include an FR-4 PCB or a metal PCB 320 installed to attach the lower surface of the driver IC 110 to the upper surface as shown in FIG. 6. In this case, both sides or slopes of the power supply line (a) for supplying power to the driver IC 110 are wire bonded to the FR-4 PCB or metal PCB 320 and the driver IC 110.

Alternatively, as shown in FIG. 7, the heat dissipation unit 310 is another embodiment of the present outbreak. A heat dissipation plate 311 formed of a copper PCB or a copper plate, and a heat dissipation plate 311 are stacked on the inner driver IC ( 110) includes a FR-4 PCB or a metal PCB 320 having a through hole 321 penetrating the top and bottom so that it can be installed in close contact with the heat sink 310, and a thermal bonding agent is directly applied to the plate made of aluminum or copper. Can be attached directly by using. In this case, both ends of the power supply line (a) for supplying power to the driver IC 110 are wire bonded to the FR-4 PCB or metal PCB 320 and the driver IC 110, respectively.

Meanwhile, the detection sensor 210 is installed on one side of the vehicle to detect pedestrians or moving objects around the vehicle, and a motion detection sensor such as an ultrasonic sensor or an infrared sensor may be applied.

The main control unit 220 is installed on the painted side of the vehicle to control the lighting such as the head lamp or the tail lamp to be turned off and the micro LED module 100 to be turned on by receiving a signal from the detection sensor 210. It is connected to the LED module 100 and the detection sensor 210, respectively.

The notification unit 230 is connected to the main control unit and generates a sound so that a pedestrian or a driver can recognize when an object moving by the detection sensor 210 enters a set distance. The electronic horn of the vehicle may be applied, but a separate A sound device may be installed.

Referring to Figure 2, the operation of the vehicle lighting device using a micro LED having the structure as described above will be described.

When a pedestrian or a moving object is detected through the detection sensor 210, a detection signal is transmitted to the main controller 220. The main controller 220 controls the detection of the detection sensor 210 to be continuously performed until a pedestrian or a moving object approaches within a set distance. When a pedestrian or a moving object approaches within a set distance, a sound is output from the notification unit 230 by the main control unit 220, and the vehicle lamp 50 such as a head lamp, a tail lamp, or a pogram flashes while the micro LED module (100) lights up. At this time, the micro LED module 100 may change the light emission color according to driving information such as forward, backward, start, stop, and proceed direction, or the main control unit 220 to implement a figure or shape as shown in FIG. Controlled by

Even while the micro LED module 100 is turned on, the detection sensor 210 detects the surroundings. If the moving object is out of the set distance, the head lamp, the tail lamp, or the pogram that has been flickering by the main control unit 220 are again It is turned on, the notification of the notification unit 230 is stopped, and the micro LED module 100 is also turned on.

The vehicle lighting device 1 using the micro LED of the present invention provides driving information of the vehicle through various colors or shapes to pedestrians as well as during driving or stopping test drivers, thereby improving safety accident prevention efficiency.

The vehicle lighting device 1 using micro LED according to the present invention applies the LED driving circuit of the AM type, which has a simple structure compared to the driving circuit of the conventional PM type LED, to produce a driving circuit of the smallest size and for a headlamp for automobiles. It is applicable to the conventional PM method, and provides a sufficient amount of light compared to the conventional PM method, thereby enabling detailed night lighting and adaptive driving beam (ADB) or variable headlight system (AFLS) to be implemented.

In addition, the present invention has an advantage of excellent heat dissipation characteristics of a headlamp for a vehicle by allowing the micro LED and the driving circuit for driving the micro LED to be simultaneously radiated.

In the above, the lighting device for a vehicle using a micro LED according to the present invention has been described with reference to an example shown in the drawings, but this is only exemplary, and various modifications and equivalents therefrom are those of ordinary skill in the art. It will be appreciated that other embodiments are possible. Therefore, the scope of the true technical protection of the present invention should be determined by the technical spirit of the appended claims.

1: Vehicle lighting device using micro LED
100: micro LED module 110: driver IC
120: light source 130: micro LED element
140: scan driver 150: data driver
160: communication module 170: control module
180: external memory 210: detection sensor
220: main control unit 230: notification unit
310: radiator

Claims (5)

It relates to a vehicle lighting device mounted on the vehicle to provide the vehicle operation information to the pedestrian,
A micro LED module mounted on the vehicle lamp or outside the vehicle,
A detection sensor that detects pedestrians or moving objects,
A main control unit that turns off the lamp being lit by receiving a signal from the detection sensor and controls the lighting of the micro LED module;
And a notification unit for outputting an alarm signal to a pedestrian or a driver when the micro LED is turned on under the control of the main control unit,
The micro LED module
A driver IC mounted along the curved surface of the lamp or the curved surface of the vehicle,
Each has a micrometer size and is mounted on the driver IC and includes a light source unit including a plurality of micro LED elements that embody different colors according to the driving information or implement figures or letters to facilitate recognition of pedestrians,
The driver IC is
A scan driver that outputs a scan signal to control the light source unit, a data driver that outputs a data signal, a communication module that receives a light emission control signal output from the main control unit provided in a vehicle, and the communication module received by the communication module. There is a built-in control module that receives a light emission control signal and controls the operation of the scan driver and the data driver, respectively,
The micro LED module
A heat dissipation unit mounted on the rear surface of the driver IC;
An external memory for storing control information corresponding to each operation mode so as to operate the light source unit in a set operation mode. delete The method of claim 1, wherein the radiating part
It is installed in close contact with the bottom of the driver IC on the upper surface,
A power supply line for supplying power to the driver IC is
A vehicle lighting device using a micro LED module, characterized in that the heat dissipation unit and the driver IC are wire-bonded and connected. The method of claim 1, wherein the radiating part
A heat sink formed of a copper PCB or copper plate,
It is stacked on the heat sink and includes an FR-4 PCB or a metal PCB having a through hole penetrating up and down so that the driver IC can be installed in close contact with the heat sink,
A power supply line for supplying power to the driver IC is
A vehicle lighting device using a micro LED module, characterized in that the FR-4 PCB or metal PCB is wire-bonded to and connected to the driver IC. The method of claim 1, wherein the main control unit
Vehicle lighting device using a micro LED module, characterized in that when a pedestrian or a moving object is detected within a set distance, a sound is output through the notification unit and the lamp of the vehicle is turned off, and then the micro LED element is controlled to emit light.

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