KR101532650B1 - A light apparatus for vehicle - Google Patents

Abstract

A vehicle lighting apparatus is disclosed. In this vehicle lighting apparatus, an illumination light-sensing section including a transistor and a zener diode is provided. The illumination light sensing part is configured to reduce the illumination brightness at a certain ratio at night so that the brightness of the daytime and nighttime illumination of the light emitting part are set differently. As a result, daytime visibility is ensured and the driver's glare due to night illumination is prevented. Furthermore, in accordance with the demand of the consumer, the dimming release mode is set at a specific time zone such as the sunset, and the brightness of the light emitting unit is switched back to the maximum, thereby increasing the visibility in a specific time zone.

IGNITION, TAIL, LCD, INDICATOR, RHEOSTAT,

Description

[0001] A LIGHT APPARATUS FOR VEHICLE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a vehicle lighting apparatus, and more particularly, to a vehicle lighting apparatus for adjusting the brightness of instrument clusters installed in a vehicle.

Generally, instruments such as an engine coolant thermometer, a tachometer, a speedometer, and a fuel quantity gauge are installed in an instrument panel of an automobile. These instruments direct each meter value to the driver by indicating the scale indicated by the pointer on the sign.

These instruments are provided with a vehicle illumination device so that the driver can more clearly grasp the running state of the vehicle at nighttime driving. The illuminance of such internal vehicle electrical components varies depending on the daytime mode and the nighttime mode.

The LCD & INDICATOR illuminator of the vehicle's full automatic temperature control (FATC) is controlled only by the RHEOSTAT lighting controller.

FIG. 1 is a graph showing the brightness between the illumination brightness of the conventional LCD & INDICATOR and the button illumination. In FIG. 1, the vertical axis represents the brightness of the light in percent and the horizontal axis represents the time (TAIL + OFF) .

Referring to FIG. 1, the button illumination is set to the minimum brightness or no brightness (0%) during daytime (TAIL + OFF), and to the maximum brightness (100%) at night. At this time, LCD & INDICATOR illumination is set to maximum brightness regardless of day (TAIL + OFF) and night (TAIL + ON). In other words, the daytime brightness of the LCD & INDICATOR light is set to the daytime brightness even at night. In a vehicle without such a light control device, as shown in FIG. 1, even when the vehicle is operated at night, the same brightness as the maximum brightness of the button illumination is obtained in a vehicle without a light control device such as a RHEOSTAT LCD & INDICATOR The illumination brightness is set to provide the cause of glare. This interferes with safe driving of the vehicle driver. In order to solve these problems, lowering the brightness of LCD & INDICATOR daytime will cause the visibility of LCD & INDICATOR to be hindered during daytime.

Accordingly, it is an object of the present invention to provide a vehicular illumination device that maintains daytime visibility by maintaining the brightness of illumination of vehicle instrument panels during the day at daytime with maximum brightness, and switches the daytime brightness to a dimmed nighttime brightness at night will be.

Another object of the present invention is to provide a lighting system for a vehicle, which illuminates the brightness of illumination of vehicle dashboards at night with a predetermined brightness and at the same time illuminates the brightness of illumination of vehicle dashboards illuminated at night, And to provide a vehicle lighting device capable of being reset.

According to an aspect of the present invention, there is provided a vehicular illumination apparatus including a constant voltage generating unit that generates a constant voltage, and a driving voltage generator that is provided with the constant voltage and outputs a driving voltage lower than the constant voltage in response to a tail- And a lighting unit for providing night brightness lower than daytime brightness in response to the driving voltage.

According to another aspect of the present invention, there is provided a vehicular illumination device including: a light source configured to generate a constant voltage in response to an ignition voltage generated at the start of a vehicle and to drive a headlight and a tail lamp A first voltage generator for generating a first voltage that is lower than the first voltage by a second voltage that is lower than the first voltage due to the generated first voltage, On voltage, and generates a second zener voltage lower than the first constant voltage in response to the constant voltage, and generates a second zener voltage lower than the first constant voltage by the generated second zener voltage, A second light sensing unit for outputting a first driving voltage, a second light sensing unit for outputting a second driving voltage, an LCD light emitting unit for sensing a daytime brightness at a first light intensity ratio at night brightness in response to the first driving voltage, An on / off switch for turning on / off the tail-on voltage in response to a light-off signal provided from the outside according to a request from the vehicle driver, an indicator light emitting part for sensing the daytime brightness at a second light- The LCD light emitting portion and the indicator light emitting portion are provided at the first and second light sensing portions and the LCD light emitting portion and the indicator light emitting portion are illuminated at the first and second light sensing portions, And converts the nighttime brightness of the indicator light emitting portion into daytime brightness.

According to the vehicle lighting apparatus of the present invention, in the daytime, the maximum brightness is maintained, daytime visibility is ensured, and in the nighttime, the brightness of the LCD and the illuminator is diminished by a certain amount, and in the vehicle without RHEOSTAT (brightness control device) Reduces vehicle driver's glare due to lighting.

In addition, according to the vehicle lighting apparatus of the present invention, by providing a circuit configuration in which the LCD and the indicator can be sensitized with the same light reduction ratio and a circuit configuration that can be dimmed in different light emission ratios, Can be set.

In addition, when the customer selects the primary light release signal, the button illumination keeps the LCD and the indicator at the daytime brightness while maintaining the maximum brightness at the nighttime. Thus, according to the consumer's preference, .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is an overall block diagram of a vehicle lighting apparatus according to an embodiment of the present invention, and FIG. 3 is a graph showing illumination brightness of the button illumination and daylight brightness provided by the vehicle illumination apparatus shown in FIG.

2, a vehicle lighting apparatus 300 according to an exemplary embodiment of the present invention includes a power source unit 100, an illumination unit 200, a dimming signal generator 300, and a rheostat 400 .

The power supply unit 100 includes an ignition voltage generator 112 and a tail voltage generator 114. The ignition voltage generator 112 generates an ignition voltage IGV and provides the generated ignition voltage IGV to the lighting unit 200. When the ignition voltage IGV is higher than the ignition voltage IGV, The tail voltage generator 114 generates a tail-on voltage (TAIL + ON) for driving at least one of a headlight and a taillight of a vehicle, and provides the generated tail-on voltage (TAIL + ON) to the lighting unit 200 .

The illuminating unit 200 includes a light emitting unit 240 that provides brightness of instrument clusters and the illuminating unit 200 emits light in response to the ignition voltage IG and the tail- And different illumination brightness for each night. In other words, as shown in FIG. 3, the lighting unit 200 provided in the vehicle lighting apparatus 300 according to an embodiment of the present invention provides illumination brightness having a maximum brightness of 100% during the daytime to ensure daytime visibility On the other hand, at the night when the tail-on voltage (TAIL + ON) is provided, the brightness of the light emitted from the light emitting unit 240 is diminished to a certain extent to reduce the glare of the driver. In the present embodiment, as shown in FIG. 3, the light emitting unit 240 shows night brightness, i.e., about 50% night brightness, which is reduced to a half of the daytime brightness. In addition, in an embodiment of the present invention, the illumination unit 200 may receive a dimming signal (DETENT) according to the taste of the consumer, so that the dimmed nighttime brightness can be switched back to a daytime brightness having a maximum brightness of 100% have. The detailed internal structure and operation of the illumination unit 200 will be described in detail below.

The photodetection signal generator 300 generates the photodetection signal DETENT and applies the photodetection signal DETENT to the illumination unit 200.

The rheostat 400 generates a pulse width modulation (PWM) signal and applies it to the illumination unit 200. The rheostat 400 has an adjustment switch (not shown) and adjusts the duty ratio of the PWM signal according to an operation of an adjustment switch (not shown). Here, the duty ratio means a ratio of the high period in one period of the pulse made up of the high period and the low period.

Hereinafter, the illumination unit 200 will be described in detail.

The illumination unit 200 includes a constant voltage generating unit 210, a light sensing unit 220, and light emitting units 230 and 240.

The constant voltage generating unit 210 receives the ignition voltage IGV from the ignition voltage generating unit 112 through the first terminal 21 to generate a constant voltage (CV).

The illumination light sensing unit 220 inputs the constant voltage V2 from the constant voltage generating unit 210 and the tail-on voltage TAIL + ON from the tail voltage generating unit 114 through the second terminal 23 And selectively receives a dimming signal (DETENT) from the dimming signal generator 300 through the third terminal 25. The illumination light sensing unit 220 outputs a driving voltage lower than the constant voltage V2 in response to the tail-on voltage TAIL + ON. Here, the driving voltage includes a first driving voltage V_LCD and a second driving voltage V_IND, and the first and second driving voltages DV1 and DV2 may have the same voltage level or different voltage levels have. When the illumination light sensing unit 220 receives the dimming release signal DETENT, it outputs the constant voltage V2 as a drive voltage. The illumination light-sensing unit 220 will be described in more detail with reference to FIGS. 4 to 10. FIG.

The light emitting unit includes a first light emitting unit 230 and a second light emitting unit 240.

The first light emitting unit 230 receives the tail-on voltage TAIL + ON from the tail voltage generator 114, the pulse width modulation signal PWM from the rheostat 400, 220 to the ignition voltage IGV. The first light emitting unit 230 includes a first LED 232 that is turned on by an ignition voltage IGV and a pulse width modulation signal PWM in a state in which the start is turned on, And a second LED 234 which is illuminated by a width modulation signal PWM. Each of the first and second LEDs 232 and 234 may include at least one lamp (LAMP).

The second light emitting unit 240 includes an LCD light emitting unit 242 and an indicator light emitting unit 244 (IND light emitting unit). The LCD light emitting unit 242 provides a first nighttime brightness lower than the daytime brightness having the maximum brightness in response to the first driving voltage V_LCD and the IND light emitting unit 244 provides the second driving voltage V_IND To provide a second nighttime brightness that is lower than the daytime brightness with the maximum brightness. Here, when the voltage level of the first driving voltage V_LCD is different from the voltage level of the second driving voltage V_IND, the first nighttime brightness and the second nighttime brightness are different from each other, The first nighttime brightness and the second nighttime brightness are equal if the voltage level of the second driving voltage V_LCD is equal to the voltage level of the second driving voltage V_IND. Therefore, the night light brightness of the LCD light emitting unit 242 and the night brightness of the IND light emitting unit 244 may be set to be the same or different from each other by the illumination light sensing unit.

When the illumination light sensing unit 220 receives the dimming signal DETENT, the illumination light sensing unit 220 generates the constant voltage V2 from the constant voltage generating unit 210 as a driving voltage, (242) and the IND light emitting unit (244), respectively, and the second light emitting unit 240 set to the night brightness is switched to the daytime brightness. That is, when the dimming release signal is applied according to the demand of the consumer, each of the light emitting portions 242 and 244, which are exposed at the nighttime brightness, can be converted to the daytime brightness.

Hereinafter, the internal configuration and operation of the illumination light sensing unit shown in FIG. 2 will be described in detail with reference to FIGS. 4 to 10. FIG.

FIG. 4 is a circuit diagram showing an internal configuration of the illumination photosensor shown in FIG. 2. FIG.

Referring to FIG. 4, the illumination light sensing unit 220 includes an LCD light sensing unit 222, an IND light sensing unit 224, and a light releasing unit 226. The LCD light sensing unit 222 receives the tail-on voltage TAIL + ON to attenuate the constant voltage V2 to a predetermined voltage level to adjust the brightness of the LCD light emitting unit. The IND light sensing unit 224 receives the tail-on voltage TAIL + ON and attenuates the constant voltage V2 to a constant voltage level to adjust the light intensity of the IND light emitting unit. The IND light sensing unit 224 receives the photodetection signal DETENT and forcibly converts the tail-on voltage TAIL + ON into a tail-off voltage TAIL + OFF. At this time, by configuring the illumination light sensing unit 220 only with the LCD light sensing unit 222 from which the IND light sensing unit 224 is removed, the dimming amount of the LCD light emitting unit 242 (brightness of illumination at night) The dimming amount of the illumination brightness of the IND light emitting portion 244 (illumination brightness at night) can be set to be the same.

Specifically, the LCD sensing part 222 includes a first transistor Q1, a second transistor Q151, and a first zener diode D9. The first transistor Q1 includes a first input terminal I1 receiving the constant voltage V2 and a first output terminal V2 outputting a first driving voltage V_LCD attenuated to a constant voltage level by the constant voltage V2. And a first control terminal C1 connected to the first input terminal I1 through a terminal O1 and a first resistor R1 and a second resistor R3. The second transistor Q151 has a second input terminal I2 and a second control terminal C2 receiving the tail-on voltage TAIL + ON and a second output terminal O2 connected to the ground voltage . The first Zener diode D9 is connected between the first input terminal I1 of the first transistor Q1 and the second input terminal I2 of the second transistor Q151.

The IND light-sensing unit 224 includes a third transistor Q5, a fourth transistor Q121, and a second zener diode D7. The third transistor Q5 has a third input terminal I3 connected to the first input terminal I1 of the LCD sensing part 222 and a third input terminal I2 connected to the third input terminal I3 of the LCD sensing part 222, A third output terminal O3 for outputting a second driving voltage V_IND and a third control terminal C3 connected to the third input terminal I3 through a third resistor R20 and a fourth resistor R252. ). The fourth transistor Q121 includes a fourth input terminal I4, a fourth control terminal C4 receiving the tail-on voltage TAIL + ON, and a fourth output terminal O4 connected to the ground voltage. . The second Zener diode D7 is connected between the third input terminal I3 of the third transistor Q5 and the fourth input terminal I4 of the fourth transistor Q121.

The photodetector 226 includes a fifth transistor Q551. The fifth transistor Q551 is connected to a fifth control terminal C5 to which a dimming release signal DETENT is applied and a second control terminal C2 of the second transistor Q151 included in the LCD light- A fifth input terminal I5 commonly connected to the fourth control terminal C4 of the fourth transistor Q121 provided in the IND light sensing unit 244 and a fifth output terminal O5 connected to the ground voltage, And a fifth transistor (Q551) including a first transistor

Hereinafter, an operation process of the illumination light sensing unit 220 will be described by dividing into a day mode (TAIL + OFF), a night mode (TAIL + ON), and a dimmer release mode (TAIL + ON).

(1) In the daytime mode (TAIL + OFF)

A constant voltage V2 is generated through the constant voltage generating portion 210 shown in Fig. The generated constant voltage V2 is then turned on through the first resistor R1 and the second resistor R3 of the LCD sensing part 222. Then, At this time, the second transistor Q151 of the LCD sensing part 222 is turned off in response to the tail-off voltage (TAIL + OFF) provided from the tail voltage generator 114 shown in FIG. 2, (V2) drives the LCD light-emitting section 242 and the IND light-emitting section 244. However, since all the voltages other than the voltage applied to the first transistor Q1 are applied to the LCD light emitting portion 242 and the IND light emitting portion 244 as the driving voltage, A voltage obtained by subtracting a voltage (a threshold voltage of Q1) applied to the LCD light emitting portion 242 and the IND light emitting portion 244 is applied to the LCD light emitting portion 242 and the IND light emitting portion 244. When the first driving voltage V_LCD provided to the LCD emission unit 242 and the second driving voltage V_IND supplied to the IND emission unit 244 are set to the same voltage level, The light emitting unit 242 and the IND light emitting unit 244 can be driven. In this case, the circuit configuration in the box made of the dotted line shown in Fig. 5 can be eliminated.

FIG. 5 is a diagram showing an internal circuit diagram of the illuminating light shown in FIG. 4, in which the actual simulated voltage value is indicated in the daytime mode, and FIG. And Fig.

5 and 6, in the daytime mode (TAIL + OFF), when the constant voltage V2 is 8.5 V, the voltage applied to the first transistor Q1 at 8.5 V is subtracted to be 7.531 V The driving voltage is applied to the LCD light emitting portion 242 and the IND light emitting portion 244. [

(2) In night mode (TAIL + ON)

The constant voltage V2 is generated through the constant voltage generator 210 shown in FIG. 2 and the generated constant voltage V2 is supplied to the first transistor Q1 through the first resistor R1 and the second resistor R3. ON. At this time, when the second transistor Q151 of the LCD sensing part 222 is turned on by the tail-on voltage TATIL + ON, a first Zener voltage of the first Zener diode D9 is applied to the first transistor The first driving voltage V_LCD applied to the first control terminal C1 of the first Zener diode D9 and the first control voltage of the first Zener diode D9 to dim the brightness of the LCD light emitting portion 242 And a circuit for providing it is constituted. When the voltage levels of the first driving voltage V_LCD applied to the LCD emission part 242 and the second driving voltage V_IND applied to the IND light emitting part 244 are made the same as in the daytime mode, It is possible to eliminate the design of the circuit in the box made up of the dotted lines shown in Fig.

If the voltage level of the first driving voltage V_LCD applied to the LCD emission unit 242 and the voltage level of the second driving voltage V_IND applied to the IND emission unit 244 are different from each other, A second Zener diode D7 for generating a second Zener voltage having a voltage level different from the first Zener voltage provided to the IND light sensing unit 224, The dimming amount of the brightness of the LCD light emitting portion 242 at the nighttime and the dimming amount of the brightness of the LED light at the night time of the IND light emitting portion 244 can be controlled to be different from each other.

Fig. 7 is a circuit diagram of the illuminating dimmer shown in Fig. 4, which shows the actual simulated voltage value in the night mode, and Fig. 8 is a graph showing the relationship between the voltage applied to the LCD light emitting portion and the IND light emitting portion Fig.

7 and 8, when the constant voltage V2 is 8.5 V, the first driving voltage V_LCD of about 3.614 V obtained by subtracting the voltage applied to the first transistor Q1 at 8.5 V is applied to the LCD emission The second driving voltage V_IND of approximately 5.424 V, which is obtained by subtracting the voltage applied to the third transistor Q5 from the voltage of 8.5 V, is applied to the IND light emitting portion 244.

That is, if the first and second Zener diodes having different specifications (different zener voltages) are designed in the LCD light sensing part and the IND light sensing part, the first control terminal Since the first Zener voltage applied to the first transistor C1 and the second Zener voltage applied to the third control terminal C3 of the third transistor Q5 of the IND light sensing unit 224 are different from each other, And the IND light emitting unit 244 are provided with different driving voltages V_LCD and V_IND, respectively.

As a result, according to the ratio of the voltage between the first Zener voltage and the second Zener voltage, the first light reduction ratio of the night light brightness to the day light brightness of the LCD light emitting part 242 and the night light brightness to the day light brightness of the IND light emitting part 244 The second dimming ratio can be set to be different from each other.

(3) In the dimming release mode,

The constant voltage V2 is generated through the constant voltage generator 210 shown in FIG. 2 and the generated constant voltage V2 is supplied to the first transistor Q1 through the first resistor R1 and the second resistor R3. ON. At this time, when the third transistor Q151 is turned on by the tail-on voltage TAIL + ON, the first control signal is supplied to the first control terminal (first control terminal) of the first transistor Q1 by the first Zener voltage of the first Zener diode D9 C1 so as to reduce the brightness of nighttime illumination with respect to the daytime brightness of the LCD light emitting portion by the first Zener voltage of the first Zener diode. When the first and second driving voltages V_LCD and V_IND respectively applied to the LCD light emitting unit and the IND light emitting unit are set to the same voltage level, the first driving voltage V_LCD, . In this case, the circuit design of the box with the dotted line shown in Fig. 9 is excluded. In order to set the first driving voltage V_LCD and the second driving voltage V_IND differently, the second driving voltage V_IND can be provided by designing the box circuit of the dotted line. At this time, by designing the first Zener diode and the second Zener diode having different specifications, the brightness of illumination for the LCD light emitting unit 242 and the IND light emitting unit 244 can be set differently at night.

2, when a dimming signal DETENT is applied from the dimming signal generator 300 shown in FIG. 2 to the dimmer 226 according to a request from the driver of the nighttime vehicle, The fifth transistor Q5 is turned on. This forces the tail-on voltage (TAIL + ON) to be forced to the tail-off voltage (TAIL + OFF). As a result, the first transistor Q2 and the third transistor Q3 are turned off by turning off the second transistor Q2 of the LCD light sensing unit 222 and the fourth transistor Q4 of the IND light sensing unit 224, A driving voltage nearly equal to the constant voltage V2 is provided to the LCD light emitting portion 242 and the IND light emitting portion 244 through the output terminals of the LCD light emitting portion 242 and the IND light emitting portion 244, respectively.

FIG. 9 is a circuit diagram of the illumination light dimming shown in FIG. 4, in which the actual simulated voltage value is indicated in the night light dimming release mode, FIG. 10 is a graph showing the simulation voltage value shown in FIG. Fig.

The LCD light sensing unit 222 receives the tail-on voltage, attenuates the constant voltage V2 generated through the ignition voltage IGV to a constant voltage level, And adjusts the brightness of the light for. The IND light sensing unit 224 receives the tail-on voltage, attenuates the constant voltage V2 generated through the ignition voltage IGV to a constant voltage level, and adjusts the illumination brightness of the IND light emitting unit 244 at night. The photodetector 226 forcibly converts the tail-on voltage into a tail-off voltage in response to the photodetection signal DETENT.

As a result, the LCD and the IND light emitting unit of the ATC can be configured as a photodetector and a photodetector circuit using transistors and zener diodes, and the brightness of illumination can be adjusted by dimming the brightness of a certain amount of brightness during the daytime. If the RHEOSTAT is designed, the adjusted lighting brightness is adjusted to adjust the lighting at night, and when the RHEOSTAT is not designed, the brightness is dimmed at a certain rate of the daytime brightness at night prevent. In addition, the daytime brightness can be increased as much as possible, thereby increasing daytime visibility.

In the prior art, there is no circuit for dimming the brightness of the LCD light emitting unit and the IND light emitting unit at night. However, in the present invention, by implementing the illumination light emitting circuit including the transistor and the Zener diode, So that the brightness difference can be obtained. This ensures daytime visibility and further prevents glare caused by night lighting. However, according to the consumer's preference, by setting the de-photolytic mode at the sunset, by switching the brightness of the LCD light-emitting unit and the IND light-emitting unit back to the maximum, the visibility at the sunset is increased, The present invention provides a vehicle lighting device capable of satisfying a demand.

While the present invention has been described in detail with reference to the accompanying drawings, it is to be understood that the invention is not limited to the above-described embodiments. Those skilled in the art will appreciate that various modifications, Of course, this is possible. Accordingly, the scope of protection of the present invention should not be limited to the above-described embodiments, but should be defined by the description of the following claims.

FIG. 1 is a graph showing the brightness between the brightness of a conventional LCD & INDICATOR and the brightness of a button.

2 is an overall block diagram of a vehicle lighting apparatus according to an embodiment of the present invention.

FIG. 3 is a graph showing brightness of illumination and brightness of a button illumination provided by the vehicle lighting apparatus shown in FIG. 2, by day and night.

FIG. 4 is a circuit diagram showing an internal configuration of the illumination photosensor shown in FIG. 2. FIG.

Fig. 5 is an internal circuit diagram of the illuminating light shown in Fig. 4, and is a circuit diagram showing actual simulated voltage values in the daytime mode.

6 is a waveform diagram of driving voltages applied to the LCD light emitting unit and the IND light emitting unit according to the simulation voltage values shown in FIG.

Fig. 7 is a circuit diagram of the illumination light dimming shown in Fig. 4, which is a circuit diagram showing actual simulated voltage values in the night mode.

8 is a waveform diagram of a driving voltage applied to the LCD light emitting unit and the IND light emitting unit by the simulation voltage value shown in FIG.

Fig. 9 is a circuit diagram of the illumination light dimming shown in Fig. 4, which is a circuit diagram showing actual simulated voltage values in the nighttime dimming release mode.

10 is a waveform diagram of driving voltages applied to the LCD light emitting unit and the IND light emitting unit by the simulation voltage values shown in FIG. 9

Claims (12)

A constant voltage generating unit for generating a constant voltage; A light sensing unit receiving the constant voltage and outputting a driving voltage lower than the constant voltage in response to the tail-on voltage (TAIL + ON); And And a light emitting unit for providing night brightness lower than daytime brightness in response to the driving voltage, The illumination light- A first transistor including a first input terminal to which the constant voltage is applied, a first output terminal for outputting the driving voltage, and a first control terminal connected to the first input terminal; A second transistor having a second input terminal, a second control terminal receiving the tail-on voltage, and a second output terminal coupled to a ground voltage; And And a second transistor connected between the first input terminal and the second input terminal and applying a Zener voltage to a first control terminal of the first transistor when the second transistor is turned on in response to the tail- And a Zener diode for outputting the driving voltage through an output terminal. The vehicular illumination device according to claim 1, wherein the constant voltage generator generates the constant voltage by receiving an ignition voltage generated at the start of the vehicle. The vehicular illumination device according to claim 2, wherein the illumination light-sensing unit provides the constant voltage corresponding to the daytime brightness to the light-emitting unit in response to a tail-off voltage (TAIL + OFF). The vehicle lighting apparatus according to claim 1, wherein the light emitting unit is at least one of an LCD light emitting unit and an indicator light emitting unit. delete The apparatus according to claim 1, further comprising a photodetector for receiving the tail-on voltage and converting the input tail-on voltage into a tail-off voltage (TAIL + OFF) in response to a photodetection signal, Wherein the photosensitive portion outputs the constant voltage in response to the tail-off voltage converted by the light-releasing portion. The vehicular illumination device according to claim 6, wherein the light emitting unit receives the constant voltage and switches the nighttime brightness corresponding to the driving voltage to the daytime brightness corresponding to the constant voltage even during the nighttime. A voltage generator for generating a constant voltage in response to an ignition voltage generated at the start of the vehicle and generating a pre-ignition voltage for driving a headlight and a taillight of the vehicle; A first illumination light sensing unit receiving the constant voltage, generating a first Zener voltage in response to a tail on voltage, and outputting a first drive voltage lower than the constant voltage by the generated first Zener voltage; A second light sensing unit for receiving the constant voltage and generating a second Zener voltage lower than the constant voltage in response to the tail-on voltage, and outputting a second drive voltage lower than the constant voltage by the generated second Zener voltage, ; An LCD light-emitting unit for sensing a daytime brightness at a first light-sensitive rate in response to the first driving voltage at a nighttime brightness; An indicator light emitting unit for sensing the daytime brightness at a second brightness rate in response to the second driving voltage; And On voltage to a tail-off voltage in response to a dimming release signal provided from the outside according to a request from a driver of the vehicle, and outputs the constant voltage provided to the first and second illumination photosensors to the LCD light- And converts the nighttime brightness of the LCD light emitting portion and the indicator light emitting portion, which are lighted at the first and second light reduction ratios, into daytime brightness at night. The vehicle lighting apparatus according to claim 8, wherein a first light-reduction ratio of the LCD light-emitting portion and a second light-reduction ratio of the indicator light-emitting portion are different according to a voltage ratio between the first zener voltage and the second zener voltage. The apparatus according to claim 8, wherein the first illumination light- A first transistor including a first input terminal receiving the constant voltage, a first output terminal outputting the first driving voltage, and a first control terminal connected to the first input terminal; A second transistor having a second input terminal, a second control terminal receiving the tail-on voltage, and a second output terminal coupled to a ground voltage; And The first transistor being connected between a first input terminal of the first transistor and a second input terminal of the second transistor, and when the second transistor is turned on in response to the tail-on voltage, And a first Zener diode for applying the first driving voltage to the first control terminal and outputting the first driving voltage through the first output terminal. 11. The apparatus according to claim 10, wherein the second illumination photosensor comprises: A third input terminal connected to the first input terminal of the first illumination light sensing unit, a third output terminal outputting the second driving voltage, and a third control terminal connected to the third input terminal A third transistor connected to the first node; A fourth transistor having a fourth control terminal receiving the tail-on voltage, and a fourth output terminal coupled to the ground voltage; And The third transistor of the third transistor being connected between a third input terminal of the third transistor and a fourth input terminal of the fourth transistor, the second zener voltage having a voltage level different from the first zener voltage, And a second Zener diode for outputting the second driving voltage having a voltage level different from the first driving voltage through the third output terminal. The image display apparatus according to claim 8, further comprising a photodetector, The on / off control unit converts the tail-on voltage to a tail-off voltage in response to a dimming signal provided from the outside according to a request from the driver, and outputs the constant voltage, which is provided to the first and second illumination photosensors, And converts the nighttime brightness of the LCD light emitting unit and the indicator light emitting unit, which are lighted at the first and second light-sensitive ratios, into daylight brightness at night.

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