Ceiling lamp control circuit

Abstract

The utility model relates to a ceiling lamp control circuit, which relates to the field of vehicle-mounted ceiling lamp control technology, and comprises a power supply device, a stabilizing device, a switch device and a ceiling lamp device, the stabilizing device is connected with the power supply device, the switching device is connected with the stabilizing device, the ceiling lamp device is connected with the switching device, the power supply device outputs a voltage signal, the stabilizing device receives the voltage signal and outputs a stable voltage after voltage stabilization filtering, and the switching device receives the stable voltage and outputs an on-off signal. The ceiling lamp device receives the on-off signal and is turned on and off in response to the on-off signal; when the switch device is started, a high-level on-off signal is output, and the ceiling lamp device receives the high-level on-off signal to be started; when the switch device is turned off, a low-level on-off signal is output, and the ceiling lamp device receives the low-level on-off signal to be turned off. The method has the effect of improving the control stability of the vehicle-mounted ceiling lamp.

Description

Technical Field

[0001] The present application relates to the field of vehicle ceiling light control technology, and in particular to a ceiling light control circuit. Background Art

[0002] The car ceiling light, also known as the interior ceiling light or reading light, is a ceiling light installed inside the car, mainly to provide lighting for the passengers in the car.

[0003] In the related art, the vehicle ceiling light is usually controlled by a switch installed near the ceiling light. A person in the vehicle manually turns on the switch to turn on the vehicle ceiling light and use the light of the vehicle ceiling light for illumination.

[0004] Regarding the above-mentioned related technologies, the switch of the vehicle ceiling light is usually powered by the vehicle power supply. However, due to the need for multiple power supplies during driving, the power supply of the vehicle power supply to the switch is easily unstable, which can easily cause the vehicle ceiling light to not be started after the personnel control the switch to start, resulting in unstable control of the vehicle ceiling light. There is still room for improvement. Utility Model Content

[0005] In order to improve the stability of vehicle ceiling light control, the present application provides a ceiling light control circuit.

[0006] The present application provides a ceiling light control circuit, which adopts the following technical solution:

[0007] A ceiling light control circuit, comprising:

[0008] A power supply device, a stabilizing device, a switch device and a ceiling light device; the stabilizing device is connected to the power supply device, the switch device is connected to the stabilizing device, the ceiling light device is connected to the switch device, the power supply device outputs a voltage signal, the stabilizing device receives the voltage signal and outputs a stable voltage after voltage stabilization and filtering, the switch device receives the stable voltage and outputs an on / off signal, and the ceiling light device receives the on / off signal and turns on and off in response to the on / off signal;

[0009] When the switch device is started, it outputs a high-level start-and-close signal, and the ceiling light device receives the high-level start-and-close signal to start; when the switch device is closed, it outputs a low-level start-and-close signal, and the ceiling light device receives the low-level start-and-close signal to close.

[0010] By adopting the above technical solution, when the switch device turns on the ceiling light device, the stabilization device filters the voltage supplied by the power supply device to the switch device smoothly, thereby ensuring that the turn-on signal output by the switch device meets the requirements for turning on or off the ceiling light device, thereby improving the stability of the vehicle ceiling light control.

[0011] Optionally, the stabilizing device includes an input filtering unit, a voltage stabilizing unit and an output filtering unit;

[0012] The input end of the input filter unit is connected to the power supply device, the input end of the voltage stabilizing unit is connected to the output end of the input filter unit, and the output filter unit is connected to the output end of the voltage stabilizing unit; the input filter unit receives a voltage signal and outputs a first regulated voltage signal, the voltage stabilizing unit receives and responds to the first regulated voltage signal to output a second regulated voltage signal, and the output filter unit receives the second regulated voltage signal and outputs a stable voltage.

[0013] By adopting the above technical solution, when the power supply device inputs the voltage signal into the stabilization device, the input filter unit performs the first filtering first, so that the voltage stabilization unit reduces the first voltage stabilization signal to the voltage required by the switching device, and the output filter unit filters the output voltage again, thereby improving the applicability and stability of the voltage signal supplied by the power supply device to the switching device.

[0014] Optionally, the switch device includes a button unit and a signal unit;

[0015] The key unit is connected to the signal unit, and the key unit is used to control the signal unit to short-circuit;

[0016] When the key unit is closed, the signal unit is partially short-circuited to output a low-level signal; when the key unit is disconnected, the signal unit outputs a high-level signal.

[0017] By adopting the above technical solution, when a person presses the button unit to close or open, the signal unit outputs a low-level signal or a high-level signal, thereby indirectly turning on the ceiling light device, thereby improving the protection of personnel.

[0018] Optionally, the ceiling light device includes an opening and closing module and a light emitting module;

[0019] The on-off module is connected to the switch device, the light emitting module is connected to the on-off module, the on-off module receives an on-off signal and outputs a control signal, and the light emitting module receives a control signal and emits light in response to the control signal;

[0020] When the on-off module receives a high-level on-off signal, the on-off module controls the power supply circuit of the light-emitting module to be closed, so that the light-emitting module emits light; when the on-off module receives a low-level on-off signal, the on-off module controls the power supply circuit of the light-emitting module to be disconnected, so that the light-emitting module does not emit light.

[0021] By adopting the above technical solution, when the opening and closing module receives a high-level opening and closing signal, the opening and closing module controls the power supply circuit of the light-emitting module to be closed, so that the light-emitting module emits light, thereby improving the convenience of controlling the ceiling light.

[0022] Optionally, the light emitting module includes a power supply unit, a light emitting unit and a delay unit;

[0023] The power supply unit is connected to the delay unit, the delay unit is connected to the light emitting unit, the power supply unit outputs a voltage signal, the delay unit receives the voltage signal and outputs a delayed voltage signal, and the light emitting unit receives and responds to the delayed voltage signal to emit light.

[0024] By adopting the above technical solution, before the power supply unit inputs the voltage signal into the light-emitting unit, it first passes through the delay unit, so that the delay unit inputs the delayed voltage signal into the light-emitting unit, so that the light-emitting unit gradually brightens, thereby improving the comfort of the ceiling lamp when used.

[0025] Optionally, the opening and closing module includes an opening and closing unit and a suppression unit;

[0026] The suppression unit is connected to the switch device, the on / off unit is connected to the suppression unit, the suppression unit receives the on / off signal and outputs the suppression on / off signal, and the on / off unit receives and responds to the suppression on / off signal to conduct;

[0027] The inhibition unit receives a high-level on-off signal and outputs a high-level inhibition on-off signal, and the on-off unit receives and responds to the high-level inhibition on-off signal to be turned on; the inhibition unit receives a low-level on-off signal and outputs a low-level inhibition on-off signal, and the on-off unit receives and responds to the low-level inhibition on-off signal without being turned on.

[0028] By adopting the above technical solution, the suppression unit filters and stabilizes the opening and closing signal and then inputs it into the opening and closing unit, thereby preventing the opening and closing signal from being unstable and causing the conduction instability of the opening and closing unit, thereby improving the stability of the opening and closing module.

[0029] Optionally, it also includes a backlight device and a backlight positive line, the backlight device and the backlight positive line are connected, the backlight positive line outputs a voltage signal, and the backlight device receives and responds to the voltage signal to emit light.

[0030] By adopting the above technical solution, the positive line of the backlight lamp inputs a voltage signal into the backlight device, so that the backlight device emits light, thereby improving the diversity of the use of the ceiling lamp.

[0031] Optionally, the backlight device includes a backlight unit and a stabilizing unit, the stabilizing unit is connected to the positive line of the backlight lamp, the backlight unit is connected to the stabilizing unit, and the stabilizing unit is used to filter the voltage signal provided by the positive line of the backlight lamp to the backlight unit; the backlight unit is connected in parallel with the start and stop module.

[0032] By adopting the above technical solution, the stabilizing unit filters and stabilizes the voltage signal of the backlight positive line input to the backlight unit, thereby reducing the flicker of the backlight unit and improving the stability of the backlight unit. When the ceiling light device is illuminated, the on-off module reduces the voltage of the backlight unit and reduces the brightness of the backlight unit, thereby preventing the backlight unit from affecting the ceiling light device.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. When the switch device turns on the ceiling light device, the stabilizing device filters and stabilizes the voltage supplied from the power supply device to the switch device, thereby ensuring that the turn-on signal output by the switch device meets the requirements for turning on or off the ceiling light device, thereby improving the stability of the vehicle ceiling light control;

[0035] 2. When the power supply device inputs the voltage signal into the stabilizing device, the input filter unit first performs the first filtering, so that the voltage stabilizing unit reduces the first stabilizing signal to the voltage required by the switching device, and the output filter unit filters the output voltage again, thereby improving the applicability and stability of the voltage signal supplied by the power supply device to the switching device;

[0036] 3. By passing the voltage signal through the delay unit before the power supply unit inputs the voltage signal into the light-emitting unit, the delay unit inputs the delayed voltage signal into the light-emitting unit, so that the light-emitting unit gradually lights up, thereby improving the comfort of using the ceiling light. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a circuit diagram of a power supply device and a stabilizing device in an embodiment of the present application.

[0038] Figure 2 is a circuit diagram of a switch device in an embodiment of the present application.

[0039] Figure 3 It is a circuit diagram of the ceiling light device, backlight device and backlight positive line in the embodiment of the present application.

[0040] Explanation of the accompanying drawings: 1. Power supply device; 2. Stabilizing device; 21. Input filter unit; 22. Voltage stabilizing unit; 23. Output filter unit; 3. Switching device; 31. Key unit; 32. Signal unit; 4. Ceiling light device; 41. Opening and closing module; 411. Opening and closing unit; 412. Suppression unit; 42. Light-emitting module; 421. Power supply unit; 422. Light-emitting unit; 423. Delay unit; 5. Backlight device; 51. Backlight unit; 52. Stabilizing unit; 6. Backlight positive line. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-Figure 3 This application is described in further detail.

[0042] Combination Figure 1 , Figure 2 and Figure 3 , the embodiment of the present application discloses a ceiling light control circuit, including: a power supply device 1, a stabilizing device 2, a switch device 3, a ceiling light device 4, a backlight device 5 and a backlight positive line 6. The power supply device 1 adopts a 12V DC power supply VBAT. The input end of the stabilizing device 2 is connected to the output end of the power supply device 1, so as to receive the output voltage of the power supply device 1 for voltage regulation, voltage stabilization and filtering to output a stable voltage. The input end of the switch device 3 is connected to the output end of the stabilizing device 2, so as to receive the stable voltage, and output a high-level start-and-close signal or a low-level start-and-close signal when a person manipulates the switch device 3. The way for a person in the switch device 3 to trigger a high-level start-and-close signal can be pressing a button or opening a door. The ceiling light device 4 refers to a reading light on the roof, including front, rear, left and right reading lights. One input end of the ceiling light device 4 is connected to the output end of the switch device 3, so as to control the ceiling light device 4 to emit light or not according to the high and low level start-and-close signals. The backlight device 5 is a backlight installed on a button or a car door. The backlight device 5 is powered by a backlight positive line 6, which is a 12V DC power supply. The backlight device 5 is connected in parallel to the ceiling light device 4. When the ceiling light device 4 is illuminated, the ceiling light device 4 reduces the voltage divided by the backlight device 5, thereby reducing the brightness of the backlight device 5.

[0043] Reference Figure 1 , the stabilizing device 2 includes an input filter unit 21, a voltage stabilizing unit 22 and an output filter unit 23. The input filter unit 21 includes a transient suppression diode DZ1, a ceramic capacitor C1, a ceramic capacitor C2, a ceramic capacitor C3, an electrolytic capacitor EC1, a diode D1 and a resistor R1. The model of the transient suppression diode DZ1 can be a SMAJ12A transient suppression diode. The ceramic capacitor C1, the ceramic capacitor C2 and the ceramic capacitor C3 can be a GRM188R61H105KA9D ceramic capacitor. The electrolytic capacitor EC1 can be a YXG102M16X22 electrolytic capacitor. The diode D1 can be a 1N4001 diode. The resistor R1 can be a 0402 precision resistor. The voltage stabilizing unit 22 includes a voltage stabilizer U1, and the voltage stabilizer U1 can be a HT7050 voltage stabilizer. The output filter unit 23 includes a ceramic capacitor C4, a ceramic capacitor C5 and an electrolytic capacitor EC2. Ceramic capacitors C4 and C5 can be GRM188R61H105KA9D ceramic capacitors, and electrolytic capacitor EC2 can be YXG102M16X22 electrolytic capacitors.

[0044] One end of the transient suppression diode DZ1 is connected to the output end of the power supply device 1, and the other end is connected to the ground line. Ceramic capacitor C1 and ceramic capacitor C2 are connected in series and then connected in parallel with transient suppression diode DZ1. Diode D1 and resistor R1 are connected in series and then connected to the input port Vin end of the voltage regulator U1, and the input end of diode D1 is connected to the input end of ceramic capacitor C1. Ceramic capacitor C3 and electrolytic capacitor EC1 are connected in parallel, and the input ends of ceramic capacitor C3 and electrolytic capacitor EC1 are connected to the output end of resistor R1, and the output ends of ceramic capacitor C3 and electrolytic capacitor EC1 are connected to the ground line. The ground line end GND of voltage regulator U1 is connected to the ground line. Ceramic capacitor C4, ceramic capacitor C5 and electrolytic capacitor EC2 are connected in parallel, and the input ends after parallel connection are connected to the output port Vout end of voltage regulator U1, and the output ends after parallel connection are connected to the ground line.

[0045] The power supply device 1 provides a 12V DC voltage, and the transient suppression diode DZ1 ensures that the 12V DC voltage will not change suddenly. The ceramic capacitors C1 and C2 filter out the high-frequency noise in the 12V DC voltage stabilized by the transient suppression diode DZ1. The diode D1 prevents the current from reversing. The resistor R1 is used for the voltage divider protection circuit. The parallel ceramic capacitors C3 and electrolytic capacitors EC1 filter out the high-frequency and low-frequency noise of the voltage after the voltage division, thereby ensuring that the voltage entering the voltage regulator U1 is normal. The voltage regulator U1 converts the input DC voltage into a 5V DC voltage. The ceramic capacitors C4, C5 and electrolytic capacitors EC2 are connected in parallel to form a filter network, thereby filtering out the high-frequency and low-frequency noise of the 5V DC voltage output by the voltage regulator U1, so as to output a smooth 5V DC voltage to the switch device 3.

[0046] Reference Figure 2 The switch device 3 includes a key unit 31 and a signal unit 32. The key unit 31 includes a reset key S1. The signal unit 32 includes a resistor R2, a resistor R3 and a ceramic capacitor C6. The resistor R2 and the resistor R3 can be 0402 precision resistors. The ceramic capacitor C6 can be a GRM188R61H105KA9D ceramic capacitor.

[0047] The resistor R2 and the resistor R3 are connected in series, the input end of the resistor R2 is connected to the output port Vout of the stabilizing device 2, and the output end of the resistor R3 is connected to the output port KEY IN. One end of the ceramic capacitor C6 is connected to the output end of the resistor R3, and the other end is connected to the ground wire. The reset button S1 is connected in parallel with the resistor R3.

[0048] The output port Vout of the voltage stabilizing device provides voltage to the resistor R2 and the resistor R3. When the reset button S1 is disconnected, the output port Vout of the voltage stabilizing device, the resistor R2 and the resistor R3 form a closed loop, outputting a high-level start-and-stop signal, and the ceramic capacitor C6 filters out the noise in the high-level start-and-stop signal. When the reset button S1 is closed, the reset button S1 short-circuits the resistor R3, thereby outputting a low-level start-and-stop signal.

[0049] Reference Figure 3 The ceiling light device 4 includes an opening and closing module 41 and a light-emitting module 42. The opening and closing module 41 includes an opening and closing unit 411 and a suppression unit 412. The light-emitting module 42 includes a power supply unit 421, a light-emitting unit 422 and a delay unit 423. The opening and closing unit 411 includes a transistor Q1, which is an NPN transistor and has a model of S9013. The suppression unit 412 includes a resistor R8, a resistor R9, a resistor R10 and a ceramic capacitor C7. The resistor R8, the resistor R9 and the resistor R10 can use 0402 precision resistors. The ceramic capacitor C7 can use a GRM188R61H105KA9D ceramic capacitor. The power supply unit 421 includes a 12V DC power supply VCC. The light-emitting unit 422 includes a light-emitting diode LED1, and the light-emitting diode LED1 can use the FG series. The delay unit 423 includes a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a ceramic capacitor C8. The resistors R4, R5, R6 and R7 can be 0402 precision resistors. The ceramic capacitor C8 can be a GRM188R61H105KA9D ceramic capacitor.

[0050] One end of the resistor R8 is connected to the output port KEY IN, and the other end of the resistor R8 is connected to the input end of the resistor R9 and the ceramic capacitor C7. The output end of the ceramic capacitor C7 is grounded. The output end of the resistor R9 is connected to the input end of the resistor R10 and the base of the transistor Q1. The base of the transistor Q1 is connected to the output end of the resistor R10 and grounded. One end of the resistor R4, the resistor R5, the resistor R6 and the resistor R7 connected in parallel is connected to the output end of the 12V DC power supply VCC, and the other end is connected to the input end of the light emitting diode LED1. The light emitting diode LED1 is connected to the collector of the transistor Q1 after being connected in parallel with the ceramic capacitor C8.

[0051] Resistor R8 and ceramic capacitor C7 form an RC filter to filter out the noise in the high-level start-stop signal input from the output port KEY IN and then input it to resistors R9 and R10. Resistor R9 provides an appropriate bias voltage for the base of transistor Q1 to turn on transistor Q1, while resistor R10 reduces the self-oscillation of transistor Q1. After transistor Q1 is turned on, the 12V DC power supply VCC provides voltage, which is divided by resistors R4, R5, R6 and R7, and then the current is transmitted to the light-emitting diode LED1 through the delay circuit composed of resistors R4, R5, R6, R7 and ceramic capacitor C8, so that the light-emitting diode LED1 emits light.

[0052] Reference Figure 3 The backlight device 5 includes a backlight unit 51 and a stabilizing unit 52. The backlight unit 51 includes a light emitting diode LED2. The stabilizing unit 52 includes a resistor R11 and a ceramic capacitor C9. The light emitting diode LED2 can be an FG series. The resistor R11 can be a 0402 precision resistor. The ceramic capacitor C9 can be a GRM188R61H105KA9D ceramic capacitor. A diode D2 is provided between the backlight device 5 and the opening and closing module 41, and the diode D2 can be a 1N4001 diode.

[0053] One end of the resistor R11 is connected to the backlight positive line 6, and the other end is connected to the input end of the light emitting diode LED2. The light emitting diode LED2 is connected in parallel with the ceramic capacitor C9 and then grounded. The input end of the diode D2 is connected to the input end of the light emitting diode LED2, and the output end of the diode D2 is connected to the collector of the transistor Q1.

[0054] When the transistor Q1 is not turned on, the backlight positive line 6 provides a 12V DC voltage, so that the RC filter formed by the resistor R11 and the ceramic capacitor C9 filters the input voltage, and then the voltage after the noise is filtered is input to the light-emitting diode LED2, so that the light-emitting diode LED2 emits light to form the backlight. When the transistor Q1 is turned on, after the current passes through the resistor R11, a part of the current is transmitted to the collector of the transistor Q1 through the diode D2, so that the voltage of the light-emitting diode LED2 is reduced, thereby reducing the backlight brightness of the light-emitting diode LED2.

[0055] The implementation principle of a ceiling light control circuit in the embodiment of the present application is:

[0056] The output voltage of the power supply device 1 is regulated and noise is filtered through the stabilizing device 2, so as to output a stable voltage suitable for use by the switch device 3. After receiving the stable voltage, the switch device 3 outputs a high-level start and close signal under the operation mode of personnel. After the ceiling light device 4 receives the high-level start and close signal, the circuit is turned on and emits light, thereby improving the stability of the control of the ceiling light device 4.

[0057] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A ceiling light control circuit, characterized in that: It comprises a power supply device (1), a stabilizing device (2), a switch device (3) and a ceiling light device (4); The stabilizing device (2) is connected to the power supply device (1), the switching device (3) is connected to the stabilizing device (2), and the ceiling light device (4) is connected to the switching device (3); the power supply device (1) outputs a voltage signal, the stabilizing device (2) receives the voltage signal and outputs a stable voltage after voltage stabilization and filtering, the switching device (3) receives the stable voltage and outputs an on / off signal, and the ceiling light device (4) receives the on / off signal and turns on and off in response to the on / off signal; When the switch device (3) is started, it outputs a high-level start-and-close signal, and the ceiling light device (4) receives the high-level start-and-close signal to start; when the switch device (3) is closed, it outputs a low-level start-and-close signal, and the ceiling light device (4) receives the low-level start-and-close signal to close.

2. A ceiling light control circuit according to claim 1, characterized in that: The stabilizing device (2) comprises an input filtering unit (21), a voltage stabilizing unit (22) and an output filtering unit (23); The input end of the input filter unit (21) is connected to the power supply device (1), the input end of the voltage stabilizing unit (22) is connected to the output end of the input filter unit (21), and the output filter unit (23) is connected to the output end of the voltage stabilizing unit (22); the input filter unit (21) receives a voltage signal and outputs a first regulated voltage signal, the voltage stabilizing unit (22) receives and responds to the first regulated voltage signal to output a second regulated voltage signal, and the output filter unit (23) receives the second regulated voltage signal and outputs a regulated voltage.

3. A ceiling light control circuit according to claim 1, characterized in that: The switch device (3) comprises a key unit (31) and a signal unit (32); The key unit (31) is connected to the signal unit (32), and the key unit (31) is used to control the short circuit of the signal unit (32); When the key unit (31) is closed, the signal unit (32) is partially short-circuited to output a low-level signal; when the key unit (31) is open, the signal unit (32) outputs a high-level signal.

4. A ceiling light control circuit according to claim 1, characterized in that: The ceiling light device (4) comprises an opening and closing module (41) and a light emitting module (42); The on / off module (41) is connected to the switch device (3), the light emitting module (42) is connected to the on / off module (41), the on / off module (41) receives an on / off signal and outputs a control signal, and the light emitting module (42) receives a control signal and emits light in response to the control signal; When the on / off module (41) receives a high-level on / off signal, the on / off module (41) controls the power supply circuit of the light-emitting module (42) to be closed, so that the light-emitting module (42) emits light; when the on / off module (41) receives a low-level on / off signal, the on / off module (41) controls the power supply circuit of the light-emitting module (42) to be disconnected, so that the light-emitting module (42) does not emit light.

5. A ceiling light control circuit according to claim 4, characterized in that: The light emitting module (42) comprises a power supply unit (421), a light emitting unit (422) and a delay unit (423); The power supply unit (421) is connected to the delay unit (423), the delay unit (423) is connected to the light-emitting unit (422), the power supply unit (421) outputs a voltage signal, the delay unit (423) receives the voltage signal and outputs a delayed voltage signal, and the light-emitting unit (422) receives and responds to the delayed voltage signal to emit light.

6. A ceiling light control circuit according to claim 4, characterized in that: The opening and closing module (41) comprises an opening and closing unit (411) and a suppression unit (412); The suppression unit (412) is connected to the switch device (3), the on / off unit (411) is connected to the suppression unit (412), the suppression unit (412) receives an on / off signal and outputs an inhibition on / off signal, and the on / off unit (411) receives and responds to the inhibition on / off signal to conduct; The suppression unit (412) receives a high-level on / off signal and outputs a high-level suppression on / off signal, and the on / off unit (411) receives and responds to the high-level suppression on / off signal to be turned on; the suppression unit (412) receives a low-level on / off signal and outputs a low-level suppression on / off signal, and the on / off unit (411) receives and responds to the low-level suppression on / off signal not to be turned on.

7. A ceiling light control circuit according to claim 4, characterized in that: It also includes a backlight device (5) and a backlight positive line (6), wherein the backlight device (5) and the backlight positive line (6) are connected, the backlight positive line (6) outputs a voltage signal, and the backlight device (5) receives and responds to the voltage signal to emit light.

8. A ceiling light control circuit according to claim 7, characterized in that: The backlight device (5) comprises a backlight unit (51) and a stabilizing unit (52), wherein the stabilizing unit (52) is connected to a positive line (6) of the backlight lamp, the backlight unit (51) is connected to the stabilizing unit (52), and the stabilizing unit (52) is used to filter a voltage signal provided by the positive line (6) of the backlight lamp to the backlight unit (51); the backlight unit (51) is connected in parallel to an on / off module (41).

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