KR20190009200A - Car lamp using semiconductor light emitting device - Google Patents

Abstract

The present invention forms lamp performance by using a current driving method and a voltage driving method in combination with each lamp function (e.g., a tail lamp, a brake lamp, a direction indicating lamp, etc.) in a vehicle lamp using a semiconductor light emitting element, A first panel including first semiconductor light emitting elements; A second panel disposed adjacent to the first panel and having second semiconductor light emitting elements; A current drive circuit having a drive integrated circuit electrically connected to the first panel so that the first panel is current driven; A voltage driving circuit electrically connected to the second panel to drive a voltage of the second panel; And a controller for selectively controlling the current driving circuit and the voltage driving circuit based on whether the signal received from the vehicle is a brake signal, a tail signal, or a turn signal lamp signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lamp for a vehicle using a semiconductor light-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp for a vehicle, and more particularly to a lamp for a vehicle using a semiconductor light emitting element.

The vehicle is equipped with a variety of vehicle lamps having a lighting function or a signal function. Generally, a halogen lamp or a gas discharge lamp has been mainly used, but in recent years, a light emitting diode (LED) has attracted attention as a light source of a vehicle lamp.

Light emitting diodes (LEDs) are designed to minimize the size of LEDs and increase the design freedom of lamps. [0002] Light emitting diodes (LEDs) themselves, rather than packages, are semiconductor light emitting devices that convert current into light and are being developed as light sources for display images of electronic devices including information communication equipment.

Since the vehicle lamps developed so far use light emitting diodes in the form of packages, their yields are not good and cost is high, and the degree of flexibility is weak.

Therefore, in recent years, there has been an attempt to manufacture a surface light source using a semiconductor light emitting device itself, not a package, and to apply the surface light source to a vehicle lamp. However, the ratio of the area occupied by the conductive type electrode is lower than that of the general LED, in the case of a semiconductor unit of a micro unit. Therefore, the specific gravity of the loss region where light is lost to the outside in the outer periphery of the conductive type electrode may be larger than that of a general LED in a micro-unit.

Conventionally, only a voltage driving method is applied by applying a device with a low cost in a rear lamp configuration.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicular lamp using a micro-unit semiconductor light emitting device in which a current driving method and a voltage driving method are mixed according to each lamp function (e.g., a tail lamp, a brake lamp, .

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the objects of the present invention, a vehicle lamp according to the present invention includes: a first panel having first semiconductor light emitting elements; A second panel disposed adjacent to the first panel and having second semiconductor light emitting elements; A current drive circuit having a drive integrated circuit electrically connected to the first panel so that the first panel is current driven; A voltage driving circuit electrically connected to the second panel to drive a voltage of the second panel; And a controller for selectively controlling the current driving circuit and the voltage driving circuit based on whether the signal received from the vehicle is a brake signal, a tail signal, or a turn signal lamp signal.

Specifically, the controller may increase a duty ratio of a PWM (Pulse Width Modulation) signal of a current generated through the current driving circuit so that the brightness of the brake lamp is increased, and apply the increased duty value to the first panel can do.

Further, the first panel may be applied to a composite lamp having a brake lamp and a tail lamp of the vehicle, wherein the control unit controls a PWM (Pulse Width Modulation) of a current generated through the current driving circuit so that the brightness of the brake lamp is increased. ) Signal of the current generated through the current drive circuit so that the duty of the signal is increased, the increased duty value is applied to the first panel, and the luminance of the tail lamp is decreased, And to apply the reduced duty value to the first panel.

The controller may select the current driving circuit based on a break signal and apply a driving current to the first panel through the current driving circuit to drive the first panel.

The controller may select the voltage driving circuit based on a turn signal lamp, and apply a driving voltage to the second panel through the voltage driving circuit to drive the second panel.

In one embodiment of the present invention, if the power consumption of the brake lamp is greater than a reference value, the controller may adopt a current driving scheme of the current driving circuit to drive the brake lamp. In addition, if the power consumption of the tail lamp is lower than the reference, the controller may employ a voltage driving method of the voltage driving circuit to drive the tail lamp.

In an embodiment, the first and second panels may be plurally formed in series or in parallel, and may be applied to at least one of the rear lamps of the vehicle.

The details of other embodiments are included in the detailed description and drawings.

In the vehicle lamp according to the present invention, the current driving method and the voltage driving method are mixed according to each lamp function (e.g., a tail lamp, a brake lamp, a direction indicating lamp, etc.) of a vehicle lamp using a micro- The performance of the lamp can be improved.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1A is a conceptual view showing a rear lamp as one embodiment of a lamp for a vehicle.
1B is an enlarged view of the rear lamp of FIG. 1A.
2 is a partially enlarged view of a portion A in Fig.
3 is a cross-sectional view of Fig.
4 is a conceptual diagram showing a vertical semiconductor light emitting device of FIG.
Fig. 5 is a configuration diagram showing a vehicle lamp according to an embodiment of the present invention.
6 is an exemplary view showing a rear lamp module for a vehicle according to an embodiment of the present invention.
7 is an exemplary view showing another rear lamp module according to an embodiment of the present invention.
8 is a view illustrating another example of a rear lamp module according to an embodiment of the present invention.
9 is a view illustrating another example of a rear lamp module for a vehicle according to an embodiment of the present invention.
10 is an exemplary view showing another rear lamp module for a vehicle according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. In addition, it should be noted that the attached drawings are only for easy understanding of the embodiments disclosed in the present specification, and should not be construed as limiting the technical idea disclosed in the present specification by the attached drawings.

It is also to be understood that when an element such as a layer, region or substrate is referred to as being present on another element "on," it is understood that it may be directly on the other element or there may be an intermediate element in between There will be.

The vehicle lamp described in this specification may include a head lamp, a tail lamp, a car light, a fog lamp, a turn signal lamp, a brake lamp, an emergency lamp, a tail lamp, and the like. However, it will be readily apparent to those skilled in the art that the configuration according to the embodiments described herein may be applied to a device capable of emitting light, even in the form of a new product to be developed in the future.

FIG. 1A is a conceptual view showing a rear lamp as an embodiment of a vehicle lamp, and FIG. 1B is an enlarged view of the rear lamp of FIG. 1A.

Referring to FIG. 1A, a rear lamp 100 of a vehicle is disposed on both sides of a rear surface of the vehicle, thereby forming a rear surface appearance of the vehicle.

The rear lamp 100 may be a lamp combined with a tail lamp, a brake lamp 100a, a turn signal lamp 100b, an emergency light, and a tail lamp in a package form. The tail lamps, the turn signal lamps 100b, the brake lamps 100a, the emergency lamps, and the tail lamps may be separately arranged, and the brake lamps 100a may perform a tail lamp function as well as a brake lamp function . Further, the shapes of the taillights, the turn signal lamps 100b, the brake lamps 100a, the emergency lights, and the tail lamps can be variously formed according to the designer's intention. Further, the sizes of the taillight, the turn signal lamp 100b, the brake lamp 100a, the emergency lamp, and the tail lamp can be manufactured in various sizes according to the designer's intention.

The positions of the taillights, the brake lamps 100a, the turn signal lamps 100b, the emergency lights, and the tail lamps in the rear lamp 100 may be changed by a designer.

The rear lamp 100 includes a plurality of lamps selectively emitting light according to the control of the vehicle.

At least one of the plurality of lamps may be formed to emit a predetermined shape. As one example, the brake lamp 100a may be formed to be long in the horizontal direction and curved at least in a vertical direction so as to emit a shape corresponding to the shape of the brake lamp 100a . Further, the brake lamp 100a can be bent toward the front of the vehicle. Such a complex shape in a three-dimensional shape can be realized by a plurality of light emitting regions.

Referring to FIG. 1B, the light emitting regions having different shapes are combined with each other to realize the predetermined shape.

A light source 200 implemented by a semiconductor light emitting device may be disposed in the light emitting area. The light source unit 200 may be fixed to a vehicle body through a frame, and a wiring line for supplying power to the light source unit 200 may be connected to the frame.

The light source unit 200 may be a flexible light source which can be bent by an external force, bent, twistable, foldable, or curled. In addition, the light source 200 may be a planar light source having a light emitting surface corresponding to the light emitting area.

In this case, the plurality of light sources 200 may be disposed in each of the light emitting regions, or one light source may be formed to realize the entire shape.

The pixel of the light source 200 may be implemented by a semiconductor light emitting device. In the present invention, a light emitting diode (LED) is exemplified as one type of semiconductor light emitting device for converting a current into light. The light emitting diode may be a light emitting device having a size of several to several tens of micrometers, and may serve as a pixel in a three-dimensional space.

Hereinafter, the light source unit 200 implemented using the light emitting diode will be described in detail with reference to the drawings.

FIG. 2 is a partial enlarged view of part A of FIG. 1, FIG. 3 is a sectional view, and FIG. 4 is a conceptual view showing the vertical semiconductor light emitting device of FIG.

2, 3, and 4, a passive matrix (PM) semiconductor light emitting device is used as the light source unit 200 using the semiconductor light emitting device. However, the example described below is also applicable to an active matrix (AM) semiconductor light emitting device.

The light source 200 includes a base substrate 210, a first electrode 220, an adhesive layer 230, a second electrode 240, and a plurality of semiconductor light emitting devices 250.

The base substrate 210 may be a base layer on which a structure is formed through an entire process, and may be a wiring substrate on which the first electrode 220 is disposed. The base substrate 210 may include glass or polyimide (PI) to implement a flexible light source unit. Further, the base substrate 210 may be a thin metal. In addition, any insulating material such as PEN (polyethylene naphthalate) and PET (polyethylene terephthalate) may be used as long as it is insulating and flexible. In addition, the substrate 210 may be either a transparent material or an opaque material.

Meanwhile, a heat radiation sheet, a heat sink, or the like may be mounted on the base substrate 210 to implement a heat radiation function. In this case, the heat-radiating sheet, the heat sink, or the like may be mounted on a surface opposite to the surface on which the first electrode 220 is disposed.

The first electrode 220 is located on the base substrate 210 and may be formed as a surface-shaped electrode. Therefore, the first electrode 220 may be an electrode layer disposed on the base substrate, and may serve as a data electrode.

The adhesive layer 230 is formed on the base substrate 210 on which the first electrode 220 is located.

The adhesive layer 230 may be a layer having adhesiveness and conductivity. To this end, the adhesive layer 230 may be mixed with a substance having conductivity and a substance having adhesiveness. Thus, the adhesive layer may be referred to as a conductive adhesive layer. Also, the adhesive layer 230 has ductility, which enables the flexible function in the light source unit 200.

As an example, the adhesive layer 230 may be an anisotropic conductive film (ACF), an anisotropic conductive paste, a solution containing conductive particles, or the like. The adhesive layer 230 may be configured as a layer having electrical insulation in the horizontal X-Y direction while allowing electrical interconnection in the Z direction penetrating through the thickness. Accordingly, the adhesive layer 230 may be referred to as a Z-axis conductive layer.

The anisotropic conductive film is a film in which an anisotropic conductive medium is mixed with an insulating base member. When heat and pressure are applied, only a specific part of the anisotropic conductive film has conductivity due to the anisotropic conductive medium. Hereinafter, the anisotropic conductive film is described as being subjected to heat and pressure, but other methods may be used to partially conduct the anisotropic conductive film. In this method, for example, either the heat or the pressure may be applied, or UV curing may be performed.

In addition, the anisotropic conduction medium can be, for example, a conductive ball or a conductive particle. According to the example, in the present example, the anisotropic conductive film is a film in which conductive balls are mixed with an insulating base member. When heat and pressure are applied, only specific portions are conductive by the conductive balls. The anisotropic conductive film may be a state in which a plurality of particles coated with an insulating film made of a polymer material are contained in the core of the conductive material. In this case, the insulating film is broken by heat and pressure, . At this time, the shape of the core may be deformed to form a layer in contact with each other in the thickness direction of the film. As a more specific example, heat and pressure are applied to the anisotropic conductive film as a whole, and the electrical connection in the Z-axis direction is partially formed by the height difference of the mating member adhered by the anisotropic conductive film.

As another example, the anisotropic conductive film may be in a state in which a plurality of particles coated with a conductive material are contained in the insulating core. In this case, the conductive material is deformed (pressed) to the portion where the heat and the pressure are applied, so that the conductive material becomes conductive in the thickness direction of the film. As another example, it is possible that the conductive material penetrates the insulating base member in the Z-axis direction and has conductivity in the thickness direction of the film. In this case, the conductive material may have a pointed end.

According to the present invention, the anisotropic conductive film may be a fixed array anisotropic conductive film (ACF) in which conductive balls are inserted into one surface of an insulating base member. More specifically, the insulating base member is formed of a material having adhesiveness, and the conductive ball is concentrated on the bottom portion of the insulating base member, and is deformed together with the conductive ball when heat and pressure are applied to the base member So that they have conductivity in the vertical direction.

However, the present invention is not limited thereto. The anisotropic conductive film may be formed by randomly mixing conductive balls into an insulating base member or by forming a plurality of layers in which a conductive ball is placed in a double- ACF) are all available.

The anisotropic conductive paste is a combination of a paste and a conductive ball, and may be a paste in which a conductive ball is mixed with an insulating and adhesive base material. In addition, solutions containing conductive particles can be solutions in the form of conductive particles or nanoparticles.

When the semiconductor light emitting device 250 is connected to the semiconductor light emitting device 250 by applying heat and pressure to the semiconductor light emitting device 250 after the anisotropic conductive film is positioned in a state where the first electrode 220 is positioned on the base substrate 210, 250 are electrically connected to the first electrode 220. In this case, the semiconductor light emitting device 250 may be disposed on the first electrode 220. In addition, since the anisotropic conductive film contains an adhesive component, the adhesive layer 230 realizes not only electrical connection but also mechanical bonding between the semiconductor light emitting device 250 and the first electrode 220.

As another example, the adhesive layer may include a tin-based alloy for eutectic bonding, Au, Al, or Pb, and the substrate and the semiconductor light emitting device may be bonded by Eutectic bonding.

Since the semiconductor light emitting device 250 has excellent brightness, individual unit pixels can be formed with a small size. The size of the individual semiconductor light emitting device 250 may be 80 μm or less on one side and may be a rectangular or square device. In this case, the area of the single semiconductor light emitting device may be in the range of 10 ^-10 to 10 ^-5 m ² , and the distance between the light emitting devices may be in the range of 100 μm to 10 mm.

The semiconductor light emitting device 250 may have a vertical structure.

A plurality of second electrodes 240 are disposed between the vertical semiconductor light emitting devices and the plurality of second electrodes 240 are electrically connected to the semiconductor light emitting device 250.

4, the vertical semiconductor light emitting device includes a p-type electrode 256, a p-type semiconductor layer 255 formed on the p-type electrode 256, an active layer 254 formed on the p-type semiconductor layer 255 An n-type semiconductor layer 253 formed on the active layer 254 and an n-type electrode 252 formed on the n-type semiconductor layer 253. In this case, the p-type electrode 256 located at the lower portion may be electrically connected to the first electrode 220 by the adhesive layer 230, and the n-type electrode 252 located at the upper portion may be electrically connected to the second electrode 240, As shown in FIG. Since the vertical semiconductor light emitting device 250 can arrange the electrodes up and down, it has a great advantage that the chip size can be reduced.

Referring again to FIGS. 2 and 3, the plurality of semiconductor light emitting devices 250 constitute a light emitting device array, and an insulating layer 260 is formed between the plurality of semiconductor light emitting devices 250 . For example, an insulating layer 260 is formed on one side of the adhesive layer 230 to fill a space between the semiconductor light emitting devices 250.

However, the present invention is not limited thereto, and the structure in which the adhesive layer 230 fills the space between the semiconductor light emitting elements without the insulating layer 260 is also possible.

The insulating layer 260 may be a transparent insulating layer containing silicon oxide (SiOx) or the like. As another example, the insulating layer 260, the insulating properties superior to the structure for preventing a short between the electrodes and the epoxy is light absorbing little or methyl, phenyl-based, silicon of the polymer material or, such SiN, Al ₂ O ₃ Inorganic materials can be used.

According to the structure, the phosphor layer 280 may be formed on the light emitting device array.

The phosphor layer 280 may be formed on one side of the semiconductor light emitting device 250. For example, the semiconductor light emitting device 250 is a blue semiconductor light emitting device 251 that emits blue (B) light, and a phosphor layer 280 for converting the blue (B) have. In this case, the phosphor layer 280 is formed of a red phosphor capable of converting blue light into red (R) light, a green phosphor capable of converting blue light into green (G) light, And a yellow phosphor capable of being converted into a yellow phosphor.

In this case, the wavelength of the light formed in the Nitride-based semiconductor light emitting device is in the range of 390 to 550 nm and can be converted into 450 to 670 nm through the inserted film. Further, all of the red phosphor and the green phosphor can be provided, and light of various wavelengths can be mixed to realize white light. Also, when red light is required, a light diffusion film other than a phosphor may be used when a GaAs-based red semiconductor light emitting device is used. In addition, a patterned sheet can be inserted to improve light extraction efficiency.

In this case, an optical gap layer 271 may exist between the semiconductor light emitting device 250 and the phosphor layer 280. The optical gap layer 271 may be made of a material such as epoxy, acrylic, methyl, or phenyl-based silicone having low light absorption and excellent bending properties. In addition, a patterned sheet may be inserted to optimize light efficiency, or particles having different refractive indexes may be mixed.

At this time, the color filter 272 may be laminated on the phosphor layer 280 to improve the color purity of the converted light. In addition, the color filter 272 may be formed to cover the protective layer 273 to protect the light source portion from moisture, oxygen, and external impact. At this time, the protective layer 273 may be formed through film contact or resin coating.

The electrode layer (first electrode 220) has a common electrode surface 221 on which the plurality of semiconductor light emitting devices overlap each other, and at least a part of the common electrode surface 221 is bent Can be. That is, the first electrode 220 is implemented as a surface electrode and is driven as a common electrode.

The common electrode surface 221 covers the plurality of semiconductor light emitting devices 250 so as to reflect light between the plurality of semiconductor light emitting devices 250, thereby realizing the structure of the highly reflective electrode layer, .

The common electrode surface 221 may overlap with 10 to 100,000 semiconductor light emitting devices and the semiconductor light emitting device 250 may cover the common electrode surface 221 in an array form.

For example, the plurality of semiconductor light emitting devices 250 may have a matrix shape, and the common electrode surface 221 may overlap with the semiconductor light emitting devices 250 along the up, down, left, and right directions. More specifically, the plurality of semiconductor light emitting devices 250 are arranged along rows and columns, and the common electrode surface 221 is formed such that a plurality of semiconductor light emitting devices 250 arranged along the rows and columns are overlapped with each other .

As another example, the semiconductor light emitting devices 250 may be irregularly arranged, and the common electrode surface 221 may cover the irregularly arranged semiconductor light emitting devices 250.

As another example, the electrode layer may include a plurality of unit electrode layers, and the unit electrode layers (not shown) may have unit common electrode surfaces (not shown) each having a size corresponding to a plurality of semiconductor light emitting devices can do. The unit common electrode planes may be electrically connected to each other to easily realize a planar light source of a large area. In this case, it is possible to cope with various sizes and shapes of various structures in the structure, and the unit surface light source can be replaced, so that the product life and repair can be facilitated.

As described above, since the first electrode 220 is formed as a surface electrode, disconnection that may occur as the common electrode surface 221 is curved can be mitigated or prevented. More specifically, the light source 200 may be attached to a curved or curved surface of the frame described above with reference to FIG. 1B, so that the common electrode surface 221 may be at least partially curved. At this time, at least one groove 222 may be formed in the electrode layer. The groove 222 may include a crack disposed at a curved portion of the common electrode surface 221. As the groove is formed in the curved portion, even if the common electrode surface 221 is made of metal, the elastic restoration force is weakened, and thus it can be more easily attached to the curved surface or the bent surface of the frame. In addition, even if the cracks are formed, the effect of preventing disconnection of the wiring can be exhibited because it is a surface electrode.

Alternatively, the second electrode 240 may be disposed between the semiconductor light emitting devices 250 and may be electrically connected to the semiconductor light emitting devices 250. For example, the semiconductor light emitting devices 250 may be disposed in a plurality of rows, and the second electrode 240 may be disposed between the columns of the semiconductor light emitting devices 250.

In this case, since the distance between the semiconductor light emitting devices 250 constituting the individual pixels is sufficiently large, the second electrode 240 can be positioned between the semiconductor light emitting devices 250.

In addition, the second electrode 240 may be formed as a long bar-shaped electrode in one direction. In this case, the second electrode 240 may be formed to extend along the bending line BL of the curved portion of the common electrode surface 221. For example, the second electrode 240 may be formed in parallel to the bending line BL. In this case, the second electrode 240 may not be bent in a line shape, and wiring failure may not occur. In other words, minimization of electrode stress and prevention of cracks can be exerted through n wiring electrodes parallel to the bending line BL.

The second electrode 240 and the semiconductor light emitting device 250 may be electrically connected to each other by a connection electrode protruded from the second electrode 240. More specifically, the connection electrode may be an n-type electrode 252 of the semiconductor light emitting device 250. For example, the n-type electrode 252 is formed as an ohmic electrode for ohmic contact, and the second electrode 240 covers at least a part of the ohmic electrode by printing or vapor deposition. The second electrode 240 and the n-type electrode 252 of the semiconductor light emitting device 250 can be electrically connected to each other.

According to the illustration, the second electrode 240 may be located on the insulating layer 260. In the case where the adhesive layer 230 fills the gap between the semiconductor light emitting devices without the insulating layer 260, the second electrode 240 is bonded to the adhesive layer 230, Lt; / RTI >

The second electrode 240 may be formed integrally with the n-type electrode 252 and the n-type electrode 252 may extend from the semiconductor light emitting device to one side of the insulating layer 260 . However, the present invention is not limited thereto, and the second electrode 240 may be integrally formed with the p-type electrode 256. That is, the electrode layer (first electrode) described above is an electrode electrically connected to one of the p-type electrode 256 and the n-type electrode 252 of the semiconductor light emitting device, and the p- The other one of the electrodes 252 may extend to one side of the insulating layer 260 in the semiconductor light emitting device.

Hereinafter, the second electrode 240 is formed integrally with the n-type electrode 252, and the second electrode 240 and the n-type electrode 252 are referred to as a second electrode 240 . The second electrode 240 is formed in a line shape and extends to one surface of the insulating layer 260 in a direction perpendicular to the extending direction of the line in the semiconductor light emitting device.

For the implementation of the above structure, the insulating layer 260 may include a first plane 261 covering the electrode layer and a hole formed on the opposite side of the first plane 261 to expose the semiconductor light emitting device to the outside And may have a second plane 262. The second plane 262 may be formed on the same plane as the n-type semiconductor layer 253 of the semiconductor light emitting device, so that the second electrode 240 extends to the second plane 262.

As a more specific example, the second plane 262 may be a flat surface without protruding portions, which may be realized by a planarization process described later. In practice, the second plane 262 may have a step with the outer surface of the semiconductor light emitting device, but may be flattened to 90 to 95% of the step.

According to the structure, at least one conductor 241 that is not electrically connected to the semiconductor light emitting device may be disposed on one surface of the insulating layer 260. The conductor 241 may be formed at a position where the semiconductor light emitting device is not present when the second electrode 240 is deposited. Accordingly, the conductor 241 may be formed of the same material as the other one of the p-type electrode 256 and the n-type electrode 252. For example, the conductor 241 is formed of the same material as the second electrode 240 integrated with the n-type electrode 252, as shown in this example. In addition, since the second electrode 240 is formed at the time of vapor deposition, the second electrode 240 has the same thickness as the second electrode 240.

According to the structure, the insulating layer 260 may be formed to fill between the conductor 241 and the electrode layer so as to restrict a short between the conductor 241 and the electrode layer. At this time, the insulating layer 260 may be completely filled between the conductor 241 and the first electrode 220.

Hereinafter, the current driving system and the voltage driving system are driven in accordance with the type of the rear window lamp 100 (for example, taillights, brake lamps 100a, turn signal lamps 100b, emergency lights and tail lamps) A vehicle lamp capable of improving the performance of the lamp 100 will be described with reference to Fig.

In the past, only the voltage driving method was applied by applying a low-cost device in the rear lamp configuration. However, since the OLED rear lamp is applied to the vehicle, the temperature compensation problem (current rise for stable discharge at low temperature) . Therefore, the two lamp driving methods (the voltage driving method and the current driving method) are mixed to improve the rear lamp performance and reduce the rear lamp cost.

Fig. 5 is a configuration diagram showing a vehicle lamp according to an embodiment of the present invention.

5, in the vehicle lamp according to the embodiment of the present invention,

A first panel (310) having a first light source part made up of first semiconductor light emitting elements;

A second panel 320 disposed adjacent to the first panel 310 and having a second light source 200 including second semiconductor light emitting devices;

A current drive circuit 330 having a driver IC electrically connected to the first panel 310 so that the first panel 310 is current driven;

A voltage driving circuit (340) electrically connected to the second panel (320) to drive the second panel (320) with voltage; And

A control unit 350 for selectively controlling the current driving circuit 330 and the voltage driving circuit 340 based on whether the signal received from the vehicle is a brake signal, a tail signal, or a turn signal .

The first panel 310 may be applied to at least one of a taillamp as a rear lamp, a brake lamp 100a, a turn signal lamp 100b, an emergency light, and a tail lamp.

The second panel 320 may be applied to at least one of a taillamp, a brake lamp 100a, a turn signal lamp 100b, an emergency lamp, and a tail lamp, which are rear lamps.

The first panel 310 or the second panel 320 may be applied to a lamp (composite lamp) having a tail lamp together with a brake lamp.

The first panel 310 and the second panel 320 may also be applied to a headlamp, a headlamp, a fog lamp, or the like.

The control unit 350 drives the first lamps (for example, the brake lamps 100a and the second lamps (the turn signal lamps 100b) of the rear lamp 100 in different driving schemes. 350 applies the driving current generated through the current driving circuit 330 to the first panel 310 applied to the break lamp 100a and applies the driving voltage through the voltage driving circuit 340 to the tail lamps and the turn signal lamps 100b To the second panel 320 applied to the second panel 320, respectively.

The control unit 350 selects the current driving circuit 330 based on the brake signal (braking signal) generated in accordance with the operation of the brake pedal, assuming that the first panel 310 is applied to the brake lamp 100a. And applies a first driving current to the first panel 310 through the current driving circuit 330. The first light source part 200 of the first panel 310 applied to the brake lamp 100a is driven by the first driving current to generate red light.

Assuming that the first panel 310 is applied to a lamp having a brake lamp function and a tail lamp function,

And selects the current drive circuit 330 based on a brake signal (braking signal) generated according to the operation of the brake pedal and applies a first drive current to the first panel 310 through the current drive circuit 330 and,

Selects the current driving circuit 330 based on a tail signal (tail lamp driving signal), and applies a second driving current to the first panel 310 through the current driving circuit 330. The first light source part 200 of the first panel 310 applied to the lamp having the brake lamp function and the tail lamp function is driven by the second driving current to generate the red light. The current value of the first driving current may be higher than the current value of the second driving current to increase the brightness of the brake lamp 100a.

In the present invention, it is possible to apply only a voltage driving method by applying a rear lamp of low cost to a vehicle. Recently, OLED (organic light emitting diode) rear lamps have been applied to vehicles, To drive the corresponding lamp through the current driving method.

When the second panel 310 is applied to the turn signal lamp 100b, the control unit 350 selects the voltage drive circuit 340 based on the turn signal light signal issued according to the operation of the turn signal lever, And applies the driving voltage to the second panel 320 through the voltage driving circuit 340. The second light source 200 of the second panel 320 is driven by a driving voltage to generate yellow light.

The control unit 350 drives the brake lamp in a current driving manner in consideration of the efficiency of the micro LED itself (light source unit), and drives the direction indicating lamp and the tail lamp in a voltage driving manner.

1B, since the brake lamp 100a used when the vehicle is stopped requires high brightness, the controller 350 controls the PWM (Pulse Width) of the current through the current driving circuit 330 Modulated signal to increase the brightness of the first panel applied to the brake lamp 100a and decrease the duty value of the PWM pulse signal to thereby reduce the duty ratio of the PWM signal applied to the tail lamp 100a applied to the brake lamp 100a Thereby reducing the brightness of the first panel.

In general, the original equipment manufacturer (OEM) has restrictions on the configuration of automotive parts to satisfy the mass productivity and productivity. For example, the input wiring for power supply is restricted by each function (Tail, Stop, Turn etc.) of the rear lamp 100.

As described above, since the output power is limited for each function of the rear lamp, the present invention can be said to be an indispensable driving method in order to satisfy the OEM standard. For example, when applying only the voltage driving method, there is a possibility that the circuit loss is large (less than 50% efficiency) and the OEM request performance may not be satisfied. For the rear lamp function which can not satisfy the output power rating, For the rear lamp function that can satisfy the output power rating even if the voltage driving method is applied (more than 90% efficiency), the problem of driving can be solved by applying the voltage driving method considering the cost.

From the viewpoint of efficiency, it is preferable to apply the LED driving IC by selecting the current driving method. However, since cost reduction is important from a product standpoint, it is desirable to make a rear lamp system by using a voltage driving method in combination.

In the case of brake lamps, since the luminous flux required by the automobile standard is large and the power consumption is high, the LED drive IC is applied and the high efficiency drive is performed by adopting the current drive system.

In the case of tail lamps, since the luminous flux required by the automobile standard is relatively small compared to the brake lamps and the power consumption is small, the voltage drive method that does not use the LED drive IC is adopted to form a low- .

For example, when it is assumed that the first panel 310 is applied to the brake lamp of the vehicle, since the power consumption of the brake lamp is much larger than the reference, So that the brake lamp is current-driven to perform high-efficiency driving. That is, if the power consumption of the brake lamp is greater than the reference value, the controller 350 drives the brake lamp by adopting the current driving method of the current driving circuit 330.

In addition, when the second panel 320 is assumed to have been applied to the tail lamp of the vehicle, the control unit 350 determines that the power consumption of the tail lamp is lower than the reference, Thereby performing low-efficiency driving by voltage-driving the tail lamp. That is, if the power consumption of the tail lamp is lower than the reference value, the controller 350 drives the tail lamp by driving the voltage driving circuit 340.

In the case of turn signals, the "Amber" panel has a larger light efficiency, so it is configured as a voltage driven type. When applied with "Red", the light efficiency of the "Red" panel is relatively small, Method is applied so that it does not exceed the specification of power consumption.

6 is an exemplary view showing a rear lamp module for a vehicle according to an embodiment of the present invention.

As shown in FIG. 6, the first panel 310 may be applied to a brake lamp, a tail lamp, a direction supporting lamp, and the like in a rear lamp, and the second panel 320 may also be a brake lamp, Lamps and the like.

The controller 350 controls the current drive circuit 330 based on the brake signal (braking signal) generated in accordance with the operation of the brake pedal, assuming that the first panel 310 is applied to the brake lamp 100a And applies a PWM driving first driving current I to the first panel 310 through the current driving circuit 330. The first light source part 200 of the first panel 310 applied to the brake lamp 100a is driven by the first driving current to generate red light.

In addition, when it is assumed that the first panel 310 is applied to a composite lamp having a brake lamp function and a tail lamp function, the control unit 350 controls the brake lamps based on the brake signal (brake signal) generated in accordance with the operation of the brake pedal Selects the current driving circuit 330, applies a first driving current to the first panel 310 through the current driving circuit 330,

Selects the current driving circuit 330 based on a tail signal (tail lamp driving signal), and applies a second driving current to the first panel 310 through the current driving circuit 330.

The first light source part 200 of the first panel 310 applied to the lamp having the brake lamp function and the tail lamp function is driven by the second driving current to generate the red light. The current value of the first driving current may be higher than the current value of the second driving current to increase the brightness of the brake lamp 100a.

A resistor 360 can be electrically connected in series to the first panel 310 and a stable current can be applied to the first panel 310 by the resistor 360.

When the second panel 310 is applied to the turn signal lamp 100b, the control unit 350 selects the voltage drive circuit 340 based on the turn signal light signal issued according to the operation of the turn signal lever, And applies the driving voltage to the second panel 320 through the voltage driving circuit 340. The second light source 200 of the second panel 320 is driven by a driving voltage to generate yellow light.

A resistor 370 and a Zener diode 380 may be electrically connected in parallel to the second panel 310. A stable voltage may be applied to the second panel 320 by the resistor 370 and a Zener diode 380 may block the reverse voltage applied to the second panel 310.

7 is an exemplary view showing another rear lamp module according to an embodiment of the present invention.

7, the first panel 310 may be applied to a brake lamp, a tail lamp, a directional supporting lamp, etc., in the rear lamp, and the second panel 320 may also be a rear lamp, a tail lamp, Lamps and the like.

The control unit 350 determines that the first panel 310 connected in parallel is applied to the brake lamp 100a based on the brake signal (braking signal) generated in accordance with the operation of the brake pedal, And applies the PWM first driving current I to the plurality of first panels 310 connected in parallel through the current driving circuit 330. The plurality of first light source units 200 of the plurality of first panels 310 applied to the break lamp 100a are driven by the first driving current to generate red light.

In addition, when it is assumed that a plurality of first panels 310 connected in parallel are applied to a composite lamp having a brake lamp function and a tail lamp function, the control unit 350 controls a brake signal generated by the operation of the brake pedal And applies a first driving current to the plurality of first panels 310 connected in parallel through the current driving circuit 330 and outputs a tail signal And the second driving current is applied to the plurality of first panels 310 connected in parallel through the current driving circuit 330. The first driving current is supplied to the first panel 310 through the current driving circuit 330,

The first light source part 200 of the first panel 310 applied to the lamp having the brake lamp function and the tail lamp function is driven by the second driving current to generate the red light. The current value of the first driving current may be higher than the current value of the second driving current to increase the brightness of the brake lamp 100a.

A resistor 360 can be electrically connected in series to the first panel 310 and a stable current can be applied to the first panel 310 by the resistor 360.

The control unit 350 controls the voltage driving circuit 340 based on the direction indicator light signal issued according to the operation of the direction indicator lever, assuming that a plurality of second panels 310 connected in parallel are applied to the turn signal lamp 100b And applies the driving voltage to the plurality of second panels 320 connected in parallel through the voltage driving circuit 340. [ The second light source part 200 of the plurality of second panels 320 connected in parallel is driven by a driving voltage to generate yellow light.

The resistor 370 and the zener diode 380 may be electrically connected in parallel to the plurality of second panels 310 connected in parallel and the stable voltage may be applied to the second panel 320 by the resistor 370 And may block the reverse voltage applied to the second panel 310 by the Zener diode 380.

8 is a view illustrating another example of a rear lamp module according to an embodiment of the present invention.

8, the first panel 310 can be applied to a brake lamp, a tail lamp, a direction supporting lamp, and the like in a rear lamp, and the second panel 320 can also be applied to a brake lamp, a tail lamp, Lamps and the like.

The control unit 350 determines that the plurality of first panels 310 connected in series are applied to the brake lamp 100a based on the brake signal (braking signal) generated in accordance with the operation of the brake pedal, And applies a PWM driving first driving current I to the plurality of first panels 310 connected in series through the current driving circuit 330. The plurality of first light source units 200 of the plurality of first panels 310 applied to the break lamp 100a are driven by the first driving current to generate red light.

In addition, when it is assumed that a plurality of first panels 310 connected in series are applied to a combined lamp having a brake lamp function and a tail lamp function, the control unit 350 controls a brake signal generated by the operation of the brake pedal The first driving current is applied to the plurality of first panels 310 connected in series through the current driving circuit 330 and the tail signal And the second driving current is applied to the plurality of first panel 310 connected in series through the current driving circuit 330. The first driving current is supplied to the first panel 310,

The first light source part 200 of the first panel 310 applied to the lamp having the brake lamp function and the tail lamp function is driven by the second driving current to generate the red light. The current value of the first driving current may be higher than the current value of the second driving current to increase the brightness of the brake lamp 100a.

A resistor 360 can be electrically connected in series to the first panel 310 and a stable current can be applied to the first panel 310 by the resistor 360.

The control unit 350 determines whether the second panel 310 connected in series is applied to the turn signal lamp 100b based on the direction indicator signal issued by the operation of the turn signal lever, And applies a driving voltage to the plurality of second panels 320 connected in series through the voltage driving circuit 340. [ The second light source unit 200 of the plurality of second panels 320 connected in series is driven by the driving voltage to generate yellow light.

The resistor 370 and the zener diode 380 may be electrically connected in parallel to the plurality of second panels 310 connected in series and a stable voltage may be applied to the second panel 320 by the resistor 370 And may block the reverse voltage applied to the second panel 310 by the Zener diode 380.

9 is a view illustrating another example of a rear lamp module for a vehicle according to an embodiment of the present invention.

9, the first panel 310 can be applied to a brake lamp, a tail lamp, a direction supporting lamp, and the like in a rear lamp, and the second panel 320 can also be applied to a rear lamp, Lamps and the like.

The control unit 350 determines that the first panel 310 connected in parallel is applied to the brake lamp 100a based on the brake signal (braking signal) generated in accordance with the operation of the brake pedal, And applies the PWM first driving current I to the plurality of first panels 310 connected in parallel through the current driving circuit 330. The plurality of first light source units 200 of the plurality of first panels 310 applied to the break lamp 100a are driven by the first driving current to generate red light.

In addition, when it is assumed that a plurality of first panels 310 connected in parallel are applied to a composite lamp having a brake lamp function and a tail lamp function, the control unit 350 controls a brake signal generated by the operation of the brake pedal And applies a first driving current to the plurality of first panels 310 connected in parallel through the current driving circuit 330 and outputs a tail signal And the second driving current is applied to the plurality of first panels 310 connected in parallel through the current driving circuit 330. The first driving current is supplied to the first panel 310 through the current driving circuit 330,

The first light source part 200 of the first panel 310 applied to the lamp having the brake lamp function and the tail lamp function is driven by the second driving current to generate the red light. The current value of the first driving current may be higher than the current value of the second driving current to increase the brightness of the brake lamp 100a.

A resistor 360 can be electrically connected in series to the first panel 310 and a stable current can be applied to the first panel 310 by the resistor 360.

The control unit 350 determines whether the second panel 310 connected in series is applied to the turn signal lamp 100b based on the direction indicator signal issued by the operation of the turn signal lever, And applies a driving voltage to the plurality of second panels 320 connected in series through the voltage driving circuit 340. [ The second light source unit 200 of the plurality of second panels 320 connected in series is driven by the driving voltage to generate yellow light.

The resistor 370 and the zener diode 380 may be electrically connected in parallel to the plurality of second panels 310 connected in series and a stable voltage may be applied to the second panel 320 by the resistor 370 And may block the reverse voltage applied to the second panel 310 by the Zener diode 380.

10 is an exemplary view showing another rear lamp module for a vehicle according to an embodiment of the present invention.

10, the first panel 310 can be applied to a brake lamp, a tail lamp, a direction supporting lamp, and the like in a rear lamp, and the second panel 320 can also be applied to a brake lamp, a tail lamp, Lamps and the like.

The control unit 350 determines that the plurality of first panels 310 connected in series are applied to the brake lamp 100a based on the brake signal (braking signal) generated in accordance with the operation of the brake pedal, And applies a PWM driving first driving current I to the plurality of first panels 310 connected in series through the current driving circuit 330. The plurality of first light source units 200 of the plurality of first panels 310 applied to the break lamp 100a are driven by the first driving current to generate red light.

In addition, when it is assumed that a plurality of first panels 310 connected in series are applied to a combined lamp having a brake lamp function and a tail lamp function, the control unit 350 controls a brake signal generated by the operation of the brake pedal The first driving current is applied to the plurality of first panels 310 connected in series through the current driving circuit 330 and the tail signal And the second driving current is applied to the plurality of first panel 310 connected in series through the current driving circuit 330. The first driving current is supplied to the first panel 310,

The first light source part 200 of the first panel 310 applied to the lamp having the brake lamp function and the tail lamp function is driven by the second driving current to generate the red light. The current value of the first driving current may be higher than the current value of the second driving current to increase the brightness of the brake lamp 100a.

A resistor 360 can be electrically connected in series to the first panel 310 and a stable current can be applied to the first panel 310 by the resistor 360.

The control unit 350 controls the voltage driving circuit 340 based on the direction indicator light signal issued according to the operation of the direction indicator lever, assuming that a plurality of second panels 310 connected in parallel are applied to the turn signal lamp 100b And applies the driving voltage to the plurality of second panels 320 connected in parallel through the voltage driving circuit 340. [ The second light source part 200 of the plurality of second panels 320 connected in parallel is driven by a driving voltage to generate yellow light.

The resistor 370 and the zener diode 380 may be electrically connected in parallel to the plurality of second panels 310 connected in parallel and the stable voltage may be applied to the second panel 320 by the resistor 370 And may block the reverse voltage applied to the second panel 310 by the Zener diode 380.

As described above, in the vehicle lamp according to the embodiments of the present invention, the current driving method and the voltage driving method are mixed according to the lamp functions (Tail, Stop, Turn) of the vehicle lamp using the micro- So that the performance of the lamp can be improved.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (9)

A first panel comprising first semiconductor light emitting elements;
A second panel disposed adjacent to the first panel and having second semiconductor light emitting elements;
A current drive circuit having a drive integrated circuit electrically connected to the first panel so that the first panel is current driven;
A voltage driving circuit electrically connected to the second panel to drive a voltage of the second panel; And
And a controller for selectively controlling the current driving circuit and the voltage driving circuit based on whether the signal received from the vehicle is a brake signal, a tail signal, or a turn signal light signal. 2. The vehicle of claim 1, wherein the first panel is applied to a brake lamp of the vehicle,
Wherein,
Wherein a duty value of a PWM (Pulse Width Modulation) signal of a current generated through the current drive circuit is increased so that the brightness of the brake lamp is increased, and the increased duty value is applied to the first panel lamp. 2. The hybrid vehicle lamp according to claim 1, wherein the first panel is applied to a composite lamp having a brake lamp and a tail lamp of the vehicle,
Wherein,
Increasing the duty of a PWM (Pulse Width Modulation) signal of the current generated through the current driving circuit to increase the brightness of the brake lamp, applying the increased duty value to the first panel,
Wherein a duty value of a PWM (Pulse Width Modulation) signal of a current generated through the current driving circuit is reduced and the reduced duty value is applied to the first panel so that the brightness of the tail lamp is reduced. lamp. 2. The apparatus of claim 1, wherein the first panel is applied to a brake lamp,
Wherein,
Wherein the current drive circuit is selected based on a break signal and a drive current is applied to the first panel through the current drive circuit to drive the first panel. 2. The apparatus of claim 1, wherein the second panel is applied to a direction indicator lamp,
Wherein,
Wherein the voltage driving circuit is selected on the basis of a turn signal lamp, and a driving voltage is applied to the second panel through the voltage driving circuit to drive the second panel by voltage. 2. The vehicle of claim 1, wherein the first panel is applied to a brake lamp of the vehicle,
Wherein,
Wherein the current drive circuit is selected when the power consumption of the brake lamp is larger than a reference value, and the brake lamp is current-driven through the current drive method of the current drive circuit. 7. The vehicle of claim 6, wherein the second panel is applied to a tail lamp of the vehicle,
Wherein,
Wherein the voltage driving circuit is selected when the power consumption of the tail lamp is lower than the reference, and the tail lamp is driven to be voltage by the voltage driving method of the voltage driving circuit. The lamp for a vehicle according to claim 1, wherein the first panel is formed in a plurality of or a plurality in series and is applied to at least one of the rear lamps of the vehicle. The lamp for a vehicle according to claim 1, wherein the second panel is formed in a plurality of or a plurality in series in series, and is applied to at least one of the rear lamps of the vehicle.

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