VA screen motorcycle instrument

Abstract

The utility model discloses a VA screen motorcycle instrument, which relates to the field of motorcycle instruments and comprises an instrument power-on detection circuit and a backlight indicating lamp circuit. An input signal IGN (+) of the instrument power-on detection circuit is connected with the positive electrode of a diode 2D2 and a resistor 2R1 in parallel, and the negative electrode of the diode 2D2 is connected with the filter circuit and the first signal amplification circuit. The filter circuit outputs a signal IGN + AD, and the first signal amplification circuit outputs a signal IGN + ON / OF. An input signal IGN (+) of the backlight indicating lamp circuit is amplified by the second signal amplification circuit and then enters the chip circuit, and the chip circuit controls the lighting circuit to emit light. The whole brightness of the screen can be improved through the LED lamps, the energy consumption of a display part of the screen is reduced, and the temperature of the screen is prevented from rising when the screen runs in a high-brightness state for a long time.

Description

Technical Field

[0001] The utility model relates to the field of motorcycle instruments, in particular to a VA screen motorcycle instrument. Background Art

[0002] With the advancement of intelligent technology, users are demanding increasingly sophisticated interactive experiences for motorcycle instrumentation. Traditional VA LCD displays, while maintaining high contrast, have thin LCD cells, which can easily lead to dark spots and smudges on the display. Motorcycles are subject to various vibrations during operation, so the display must possess excellent shock resistance. Patented technology, through structural design and material selection, improves the display's shock resistance and reliability, ensuring stable operation in harsh environments.

[0003] Existing VA screens, when operated at high brightness for extended periods, generate significant heat, causing screen temperature to rise, impacting display quality and device stability. While patent application CN212519518U, "An Automatic Control Circuit for Instrument Lighting," addresses the existing issue of insufficient protection for circuits and lighting components in vehicle instruments, it still fails to address the issue of screen temperature rise. Utility Model Content

[0004] The purpose of the present utility model is to provide a motorcycle instrument with an LED display VA screen that protects the circuits and lighting devices in the vehicle instrument and prevents the screen temperature from rising when running in a high-brightness state for a long time.

[0005] To achieve the above objectives, the present invention employs the following technical solution: a VA-screen motorcycle instrument, characterized by comprising an instrument power-on detection circuit and a backlight indicator circuit. The instrument power-on detection circuit comprises a filter circuit connected in parallel to a first signal amplifier circuit. The backlight indicator circuit comprises a second signal amplifier circuit connected to a chip circuit, which in turn is connected to an instrument lighting circuit.

[0006] Preferably, the meter power-on detection circuit input signal IGN(+) is connected in parallel to the anode of diode 2D2 and resistor 2R1, with the other end of resistor 2R1 grounded. The cathode of diode 2D2 is connected to capacitor 2C5 and resistor 2R6 of the filter circuit, the input voltage V2 of the first signal amplification circuit, and resistor 2R2. The other end of capacitor 2C5 of the filter circuit is grounded. The other end of resistor 2R6 is connected in parallel to resistor 2R7, capacitor 2C1, and resistor 2R. The other ends of resistor 2R7 and capacitor 2C1 are grounded. The other end of resistor 2R8 is connected to the output signal IGN+_AD and capacitor 2C4, with the other end of capacitor 2C4 grounded.

[0007] Preferably, resistor 2R2 of the first signal amplification circuit is connected in parallel with resistor 2R3, capacitor 2C2, and resistor 2R4. The other ends of resistor 2R3 and capacitor 2C2 are grounded, and the other end of resistor 2R4 is connected to the base of transistor 2Q1. The +5V input voltage of the first signal amplification circuit is connected to resistor 2R9. The other end of resistor 2R9 is connected in parallel with the collector of transistor 2Q1, capacitor 2C3, and output signal IGN+_ON / OFF. The emitter of transistor 2Q1 and the other end of capacitor 2C3 are grounded.

[0008] Preferably, the backlight indicator circuit input signal IGN(+) is connected in parallel to the positive electrodes of the polarized capacitors 3C1 and 3C2, capacitor 3C3, resistor 3R1, and inductor L1. The negative electrodes of the polarized capacitors 3C1 and 3C2 and the other end of capacitor 3C3 are grounded. The other end of resistor 3R1 is connected in parallel to capacitor 3C4, resistor 3R2, resistor 3R10, and Zener diode 3ZD1. The other ends of capacitor 3C4 and Zener diode 3ZD1 are grounded. The other end of resistor 3R10 in the backlight indicator circuit is connected in parallel to the EN pin of the chip circuit and the collector of transistor 3Q1. The backlight indicator circuit input signal PWM1 is connected to resistor 3R11. The other end of resistor 3R11 is connected in parallel to the base of transistor 3Q1 and resistor 3R12. The other end of resistor 3R12 and the emitter of transistor 3Q1 are grounded.

[0009] Preferably, the chip circuit VDD pin of the backlight indicator circuit is connected to the other end of resistor 3R2; the chip circuit TOFF pin is connected to capacitor 3C9. The chip circuit COMP pin is connected to capacitor 3C7. The chip circuit VDD pin is connected in parallel to resistors 3R6 and 3R7. The other ends of capacitors 3C9, resistors 3R6, and 3R7 and the chip circuit VSS pin are grounded. The other end of inductor L1 in the backlight indicator circuit is connected in parallel to the chip circuit SW pin and the anode of diode 3D3. The cathode of diode 3D3 is connected in parallel to Zener diode 3ZD2, capacitor 3C5, and the anode of active capacitor 3C6. The cathodes of capacitor 3C5 and active capacitor 3C6 are grounded. The other end of Zener diode 3ZD2 is connected in parallel to the chip circuit FB pin and resistor 3R3. The other end of resistor 3R3 is connected in parallel to resistor 3R4, resistor 3R5, and output signal OUT1. The other ends of resistors 3R4 and 3R5 are grounded.

[0010] Preferably, the other end of the inductor L1 of the backlight indicator circuit is connected in parallel to several resistors of the instrument lighting circuit, wherein the other end of each resistor is connected in series to several light-emitting diodes, and the cathode of the light-emitting diode is connected to the output signal OUT1.

[0011] Therefore, the utility model has the following beneficial effects: the overall brightness of the screen is improved by the LED lamp, the energy consumption of the screen display part is reduced, and the temperature of the screen is prevented from rising when running in a high-brightness state for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1Turn on the meter to test the circuit.

[0013] Figure 2 It is the backlight indicator circuit. DETAILED DESCRIPTION

[0014] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementations.

[0015] This embodiment is a VA screen motorcycle instrument, such as Figure 1 As shown, the instrument power-on detection circuit and the backlight indicator circuit are two very important components, ensuring the normal operation of the device and a good user experience. The instrument power-on detection circuit consists of a filter circuit connected in parallel with a first signal amplifier circuit. The backlight indicator circuit consists of a second signal amplifier circuit connected to a chip circuit, which is then connected to the instrument lighting circuit.

[0016] The filter circuit is the starting part of the power-on detection circuit. Its main function is to remove noise and interference in the power supply and ensure that the voltage provided to the subsequent circuit is stable and pure. The filter circuit is usually composed of capacitors, inductors and resistors, which work together to filter out unnecessary high-frequency signals. The first signal amplification circuit is connected in parallel with the filter circuit, and the signal will be sent to the first signal amplification circuit. The function of this circuit is to enhance the strength of the signal so that it is sufficient to drive the subsequent circuit. The amplification circuit may include an operational amplifier, a transistor or other types of amplification elements, which can adjust the amplitude of the signal to meet the requirements of the system. In this embodiment, a transistor is selected as the amplification element.

[0017] The second signal amplifier circuit receives the signal from the meter and amplifies it to a level sufficient to drive the backlight indicator. This typically involves further gain adjustment of the signal to ensure the backlight illuminates at the appropriate brightness. The output of the second signal amplifier circuit is connected to the chip circuit, a miniature circuit board that integrates multiple electronic components. The chip circuit controls the brightness and color of the backlight indicator and may contain a microcontroller, a driver integrated circuit, and other necessary electronic components. Finally, the chip circuit is connected to the meter lighting circuit, which is the actual light source. This circuit includes LEDs or other types of lighting elements that illuminate in response to the signal from the chip circuit, providing the meter backlight.

[0018] The instrument power-on detection circuit's input signal IGN(+) is connected in parallel to the anode of diode 2D2 and resistor 2R1, with the other end of resistor 2R1 grounded. The cathode of diode 2D2 is connected to capacitor 2C5 and resistor 2R6 of the filter circuit, as well as the input voltage V2 of the first signal amplifier circuit and resistor 2R2. The other end of capacitor 2C5 of the filter circuit is grounded. The other end of resistor 2R6 is connected in parallel to resistor 2R7, capacitor 2C1, and resistor 2R8. The other ends of resistor 2R7 and capacitor 2C1 are grounded. The other end of resistor 2R8 is connected to the output signal IGN+_AD and capacitor 2C4. The other end of capacitor 2C4 is grounded. Resistor 2R2 of the first signal amplifying circuit is connected in parallel with resistor 2R3, capacitor 2C2 and resistor 2R4; the other ends of resistor 2R3 and capacitor 2C2 are grounded; the other end of resistor 2R4 is connected to the base of transistor 2Q1; the input voltage +5V of the first signal amplifying circuit is connected to resistor 2R9; the other end of resistor 2R9 is connected in parallel with the collector of transistor 2Q1, capacitor 2C3 and output signal IGN+_ON / OFF; the emitter of transistor 2Q1 and the other end of capacitor 2C3 are grounded.

[0019] In the instrument power-on detection circuit, the input signal IGN(+) is key to initiating the entire detection process. This signal, the input terminal of the instrument power-on detection circuit, receives a signal from the vehicle's ignition system. When the user turns on the ignition switch, the IGN(+) terminal receives a high-level signal, triggering the instrument power-on detection circuit. Diode 2D2 is a unidirectional conductor, allowing current to flow from the positive terminal to the negative terminal but not in the reverse direction. In the circuit, the anode of diode 2D2 is connected in parallel with the input signal IGN(+), ensuring that the signal can flow through the diode to the subsequent circuitry. Resistor 2R1 is a current-limiting resistor, with one terminal connected to the anode of diode 2D2 and the other terminal connected to ground. This resistor limits the current through diode 2D2, preventing excessive current from damaging the diode or other circuit components.

[0020] Capacitor 2C5 is a filter capacitor, which is connected in parallel with resistor 2R6. One end of it is connected to the cathode of diode 2D2, and the other end is grounded. The function of capacitor 2C5 is to smooth the voltage waveform of the input signal IGN(+), further stabilize the voltage, remove possible high-frequency noise, including noise caused by ignition system or other power supply fluctuations, and provide a clean signal for the signal amplification circuit. The grounded end helps to provide a stable reference potential, ensuring that the capacitor can effectively filter out high-frequency interference. Resistor 2R6 is connected in parallel with capacitor 2C5, and the other end is connected in parallel with resistor 2R7, capacitor 2C1 and resistor 2R8. The function of resistor 2R6 is to limit the current of capacitor 2C5 during charging and discharging, preventing current mutations from damaging the circuit. It also helps with filtering and can provide a discharge path for the capacitor to ensure that the circuit can be quickly reset after power failure.

[0021] Resistor 2R7 and capacitor 2C1 are connected in parallel after resistor 2R6, forming another filtering network. Resistor 2R7 limits the current through capacitor 2C1, while capacitor 2C1 further smoothes the voltage waveform. This parallel RC network helps remove noise within a specific frequency range. Resistor 2R8: This resistor is connected in parallel with resistor 2R7 and capacitor 2C1. One end of the resistor is connected to resistor 2R6, and the other end is connected to the output signal IGN+_AD and capacitor 2C4. Resistor 2R8 provides a stable load for the output signal IGN+_AD and, together with capacitor 2C4, provides further filtering for the output signal.

[0022] The output signal IGN+_AD, processed by the filtering circuit, is fed into the MCU as a startup signal. This signal is a key output of the meter's power-on detection circuit. It reflects the state of the input signal IGN(+), but has been filtered for enhanced stability and reliability. Capacitor 2C4 is connected in series with resistor 2R8, with one end connected to resistor 2R8 and the other end grounded. Capacitor 2C4 provides final filtering for the output signal IGN+_AD, ensuring the signal is as smooth and stable as possible before entering the MCU.

[0023] The entire filtering circuit is designed to ensure that the meter's power-on detection circuit receives a stable, noise-free signal. By combining multiple capacitors and resistors, the circuit effectively filters out high-frequency interference from the power supply while maintaining signal integrity and accuracy. This design is crucial to improving the meter's reliability and accuracy.

[0024] The first signal amplifier circuit is a key component, responsible for further amplifying the signal to drive the rest of the instrument. Input V2 of the first signal amplifier circuit provides a higher voltage for the signal after it passes through diode 2D2. The voltage at this input is determined by resistors 2R2 and 2R6, as well as capacitor 2C5. Resistor 2R2: This resistor is connected between input V2 of the first signal amplifier circuit and ground. It is followed in parallel by resistors 2R3, capacitor 2C2, and resistor 2R4. Resistor 2R2 provides a certain load for the signal, providing a reference voltage for the signal amplifier circuit. It also works with the parallel components to ensure signal stability and amplification. The value of resistor 2R2 affects the amplifier circuit's gain, or the signal's amplification factor.

[0025] Resistor 2R3 and capacitor 2C2 are connected in parallel with resistor 2R2, forming another filtering network. Resistor 2R3 limits the current through capacitor 2C2, while capacitor 2C2 further smoothes the voltage waveform. This parallel RC network helps remove noise within a specific frequency range, ensuring signal clarity. Resistor 2R4 is connected in parallel with resistor 2R3 and capacitor 2C2. One end of the resistor is connected to these components, and the other end is connected to the base of transistor 2Q1. Resistor 2R4 provides base bias current for the transistor, which is necessary for its amplification function.

[0026] Transistor 2Q1 is a bipolar junction transistor (BJT) that acts as a switch and amplifier in the circuit. The transistor's base receives the signal from resistor 2R4, and by varying the base current, it controls the current between the collector and emitter, thereby amplifying the signal. The +5V input voltage is the power supply voltage for the first signal amplifier circuit, providing the necessary energy. This voltage is connected to the collector of transistor 2Q1 through resistor 2R9. Resistor 2R9 is connected between the +5V input voltage and the collector of transistor 2Q1. Resistor 2R9 limits the current flowing into the transistor's collector, preventing excessive current from damaging the transistor.

[0027] Capacitor 2C3 is connected in parallel with the collector of transistor 2Q1, with one end connected to the collector and the other end grounded. Capacitor 2C3 further stabilizes the collector voltage and reduces noise caused by current fluctuations. The output signal IGN+_ON / OFF is the output of the first signal amplification circuit, reflecting the amplified signal status. This signal is used to control other components of the instrument, such as the MCU. The emitter of transistor 2Q1 is the output terminal of the transistor, connected in parallel with capacitor 2C3 and grounded. Changes in the emitter voltage reflect changes in the base current, thereby amplifying the signal.

[0028] The entire first signal amplifier circuit is designed to effectively amplify the incoming signal, ensuring the meter receives a strong enough signal to drive its display and other functions. Through the amplification of the transistors, the circuit converts weak input signals into signals strong enough to drive subsequent circuits. This design is crucial for improving the meter's response speed and display clarity.

[0029] The entire meter power-on detection circuit operates as follows: When IGN(+) receives a high-level signal, current flows through diode 2D2 to the filter circuit and the first signal amplification circuit. This signal passes through capacitor 2C5 and resistor 2R6 before being fed to the filter circuit, where it is output as the IGN+_AD signal. The input voltage V2 of the first signal amplification circuit passes through resistor 2R2 to provide a reference voltage for the amplifier circuit, ensuring proper signal amplification. The amplified signal is then used to drive other components of the meter, such as the display or indicator lights, thus completing the meter power-on detection process.

[0030] The backlight indicator circuit input signal IGN(+) is connected in parallel to the positive electrodes of the polarized capacitors 3C1 and 3C2, capacitor 3C3, resistor 3R1 and inductor L1; the negative electrodes of the polarized capacitors 3C1 and 3C2 and the other end of capacitor 3C3 are grounded; the other end of resistor 3R1 is connected in parallel to capacitor 3C4, resistor 3R2, resistor 3R10 and Zener diode 3ZD1; the other ends of capacitor 3C4 and Zener diode 3ZD1 are grounded.

[0031] Polarized capacitors 3C1, 3C2, and 3C3 are connected in parallel to the input signal IGN(+) to smooth voltage fluctuations on the power line and reduce noise. The negative terminal of the polarized capacitor is grounded, and the positive terminal is connected to the subsequent circuit. Resistor 3R1 limits the flow of current, while inductor L1 helps further smooth the current and reduce transients and noise on the power line. The other end of resistor 3R1 is connected in parallel to capacitor 3C4, resistor 3R2, resistor 3R10, and Zener diode 3ZD1. Together, these components form a voltage stabilization and protection circuit. Zener diode 3ZD1 is a special type of voltage regulator diode that stabilizes voltage and prevents excessive voltage.

[0032] The other end of the backlight indicator circuit resistor 3R10 is connected in parallel to the EN pin of the chip circuit and the collector of the transistor 3Q1; the backlight indicator circuit input signal PWM1 is connected to the resistor 3R11; the other end of the resistor 3R11 is connected in parallel to the base of the transistor 3Q1 and the resistor 3R12; the other end of the resistor 3R12 and the emitter of the transistor 3Q1 are grounded.

[0033] Resistor 3R10 is connected to the chip's EN pin and the collector of transistor 3Q1, controlling the transistor's on / off state and, in turn, the backlight's brightness. The PWM1 signal is a pulse-width modulated signal used to control the backlight's brightness. It is connected to resistor 3R11, which limits the signal current. Transistor 3Q1 is a bipolar transistor that adjusts the current according to the PWM1 signal, thereby controlling the backlight's brightness.

[0034] The chip circuit VDD pin of the backlight indicator circuit is connected to the other end of resistor 3R2; the chip circuit TOFF pin is connected to capacitor 3C9; the chip circuit COMP pin is connected to capacitor 3C7; the chip circuit VDD pin is connected in parallel with resistor 3R6 and resistor 3R7; the other ends of capacitor 3C9, resistor 3R6, resistor 3R7 and the chip circuit VSS pin are grounded.

[0035] The chip circuit is the core of the backlight indicator circuit. It includes multiple pins, such as EN, TOFF, COMP, VDD, and VSS. These pins are connected to various resistors and capacitors to control the chip's functions. The other end of inductor L1 is connected in parallel to the chip circuit's SW pin and the anode of diode 3D3. These components form the power conversion and control circuit. Diode 3D3 and Zener diode 3ZD2 provide rectification and voltage regulation, ensuring stable operation of the chip circuit and the backlight indicator circuit.

[0036] In the backlight indicator circuit, the other end of inductor L1 is connected in parallel to the chip circuit's SW pin and the anode of diode 3D3. The cathode of diode 3D3 is connected in parallel to Zener diode 3ZD2, capacitor 3C5, and the anode of active capacitor 3C6. The cathodes of capacitor 3C5 and active capacitor 3C6 are connected to ground. The other end of Zener diode 3ZD2 is connected in parallel to the chip circuit's FB pin and resistor 3R3. The other end of resistor 3R3 is connected in parallel to resistors 3R4, 3R5, and output signal OUT1. The other ends of resistors 3R4 and 3R5 are grounded. The other end of inductor L1 is connected in parallel to several resistors in the instrument lighting circuit. The other end of each resistor is connected in series to several light-emitting diodes. The cathodes of the light-emitting diodes are connected to output signal OUT1.

[0037] Active capacitor 3C6 is a special type of capacitor that provides additional voltage stabilization and noise suppression within the circuit. Output signal OUT1 is the final output of the backlight indicator circuit. It is connected to the multiple resistors and LEDs in the instrument lighting circuit to control the backlight brightness. The instrument lighting circuit actually emits light and includes multiple resistors and LEDs. The other end of each resistor is connected in series with several LEDs, the cathode of which is connected to output signal OUT1. The entire backlight indicator circuit is designed to provide stable, adjustable backlight brightness to suit varying lighting conditions and user needs. By precisely controlling current and voltage, the circuit ensures clear, even illumination in all conditions.

Claims

1. A VA screen motorcycle instrument, characterized by: It includes an instrument power-on detection circuit and a backlight indicator circuit; the instrument power-on detection circuit is composed of a filter circuit connected in parallel with a first signal amplifying circuit; the backlight indicator circuit is composed of a second signal amplifying circuit connected to a chip circuit, and the chip circuit is connected to the instrument lighting circuit.

2. A VA screen motorcycle instrument according to claim 1, characterized in that: The input signal IGN(+) of the instrument power-on detection circuit is connected in parallel to the positive electrode of the diode 2D2 and the resistor 2R1. The other end of the resistor 2R1 is grounded. The cathode of the diode 2D2 is connected to the capacitor 2C5 and the resistor 2R6 of the filter circuit. The cathode of the diode 2D2 is connected to the input V2 voltage of the first signal amplification circuit and the resistor 2R2.

3. A VA screen motorcycle instrument according to claim 1 or 2, characterized in that: The other end of capacitor 2C5 of the filter circuit is grounded. The other end of resistor 2R6 is connected in parallel with resistor 2R7, capacitor 2C1 and resistor 2R8. The other ends of resistor 2R7 and capacitor 2C1 are grounded. The other end of resistor 2R8 is connected to the output signal IGN+_AD and capacitor 2C4. The other end of capacitor 2C4 is grounded.

4. A VA screen motorcycle instrument according to claim 1 or 2, characterized in that: Resistor 2R2 of the first signal amplifying circuit is connected in parallel with resistor 2R3, capacitor 2C2 and resistor 2R4. The other ends of resistor 2R3 and capacitor 2C2 are grounded, and the other end of resistor 2R4 is connected to the base of transistor 2Q1. The input voltage +5V of the first signal amplifying circuit is connected to resistor 2R9. The other end of resistor 2R9 is connected in parallel with the collector of transistor 2Q1, capacitor 2C3 and output signal IGN+_ON / OFF. The emitter of transistor 2Q1 and the other end of capacitor 2C3 are grounded.

5. The VA screen motorcycle instrument according to claim 1, characterized in that: The input signal IGN(+) of the backlight indicator circuit is connected in parallel with the positive electrodes of the polarized capacitors 3C1 and 3C2, capacitor 3C3, resistor 3R1 and inductor L1. The negative electrodes of the polarized capacitors 3C1 and 3C2 and the other end of the capacitor 3C3 are grounded. The other end of the resistor 3R1 is connected in parallel with capacitor 3C4, resistor 3R2, resistor 3R10 and Zener diode 3ZD1. The other ends of capacitor 3C4 and Zener diode 3ZD1 are grounded.

6. A VA screen motorcycle instrument according to claim 1 or 5, characterized in that: The other end of the resistor 3R10 in the backlight indicator circuit is connected in parallel to the EN pin of the chip circuit and the collector of the transistor 3Q1; the input signal PWM1 of the backlight indicator circuit is connected to the resistor 3R11, the other end of the resistor 3R11 is connected in parallel to the base of the transistor 3Q1 and the resistor 3R12, and the other end of the resistor 3R12 and the emitter of the transistor 3Q1 are grounded.

7. A VA screen motorcycle instrument according to claim 1 or 5, characterized in that: The chip circuit VDD pin of the backlight indicator circuit is connected to the other end of resistor 3R2, the chip circuit TOFF pin is connected to capacitor 3C9, the chip circuit COMP pin is connected to capacitor 3C7, the chip circuit VDD pin is connected in parallel with resistor 3R6 and resistor 3R7, and the other ends of capacitor 3C9, resistor 3R6, resistor 3R7 and the chip circuit VSS pin are grounded.

8. A VA screen motorcycle instrument according to claim 1 or 5, characterized in that: The other end of the inductor L1 in the backlight indicator circuit is connected in parallel with the chip circuit SW pin and the positive electrode of the diode 3D3. The cathode of the diode 3D3 is connected in parallel with the Zener diode 3ZD2, the capacitor 3C5, and the positive electrodes of the active capacitor 3C6. The negative electrodes of the capacitor 3C5 and the active capacitor 3C6 are grounded. The other end of the Zener diode 3ZD2 is connected in parallel with the chip circuit FB pin and the resistor 3R3. The other end of the resistor 3R3 is connected in parallel with the resistor 3R4, the resistor 3R5, and the output signal OUT1. The other ends of the resistors 3R4 and 3R5 are grounded.

9. A VA screen motorcycle instrument according to claim 1 or 5, characterized in that: The other end of the inductor L1 of the backlight indicator circuit is connected in parallel to several resistors of the instrument lighting circuit, wherein the other end of each resistor is connected in series to several light-emitting diodes, and the cathode of the light-emitting diode is connected to the output signal OUT1.

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