Toy car driving circuit and device

Abstract

The utility model relates to a toy car driving circuit and device. The circuit comprises a speed regulation unit used for outputting speed regulation signals; the delay adjusting unit is used for outputting a delay adjusting signal; the control unit is electrically connected with the speed regulation unit and the delay regulation unit, and is used for receiving the speed regulation signal and the delay regulation signal and outputting a display signal and a driving control signal; the display unit is electrically connected with the control unit and is used for receiving the display signal and displaying the speed gear and the delay time; and the driving unit is electrically connected with the control unit and is used for receiving the driving control signal and outputting a driving signal for controlling the speed of the toy car. According to the utility model, the departure time of the toy car can be delayed and controlled according to the operation of a user, the car speed of the toy car can be controlled, and set parameters of the car speed and delay can be displayed.

Description

Technical Field

[0001] The utility model relates to the technical field of toys, in particular to a toy car driving circuit and a device. Background Art

[0002] Toy cars are one of the toys that are widely favored by consumers, so their consumer market is large. In the relevant technologies, although some electric toy cars have a speed regulation function, they lack a speed gear display function, so that users cannot normally know the adjusted speed of the toy car, resulting in users lacking a speed regulation standard and having to adjust the speed repeatedly to the desired speed. The user experience is poor, and sometimes the speed regulation is improper. In addition, due to the lack of a delayed start function, the toy car starts suddenly and the speed is too fast, and may even collide with child users, causing injuries to them. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a toy car driving circuit and device.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a toy car driving circuit, comprising:

[0005] A speed regulating unit for outputting a speed regulating signal;

[0006] A delay adjustment unit for outputting a delay adjustment signal;

[0007] A control unit electrically connected to the speed regulating unit and the delay regulating unit, configured to receive the speed regulating signal and the delay regulating signal and output a display signal and a driving control signal;

[0008] a display unit electrically connected to the control unit and configured to receive the display signal and display the speed gear and delay time; and

[0009] A driving unit is electrically connected to the control unit and is used to receive the driving control signal and output a driving signal for controlling the speed of the toy vehicle.

[0010] Preferably, the speed regulating unit comprises a first potentiometer; a first end of the first potentiometer is electrically connected to a first DC voltage, a second end is grounded, and an adjustable end is electrically connected to the control unit;

[0011] The delay adjustment unit comprises a second potentiometer; a first end of the second potentiometer is electrically connected to a first DC voltage, a second end is grounded, and an adjustable end is electrically connected to the control unit.

[0012] Preferably, the display unit comprises two sub-display units;

[0013] The two sub-display units are electrically connected to the control unit respectively, wherein one of the sub-display units displays the speed gear, and the other sub-display unit displays the delay time.

[0014] Preferably, the sub-display unit includes an N-digit digital tube, N switch tubes, a first resistor and a second resistor; wherein N is a natural number;

[0015] The 8 cathodes of the N-digit digital tube are electrically connected to the control unit respectively, the N common anodes of the N-digit digital tube are electrically connected one-to-one to the output ends of the N switching tubes, the input ends of the N switching tubes are electrically connected to the second DC voltage respectively, the control ends of the N switching tubes are electrically connected to the control unit with one first resistor respectively, and the N second resistors are electrically connected one-to-one between the input ends and the control ends of the N switching tubes.

[0016] Preferably, the driving unit comprises a motor driver, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, a third resistor, a fourth resistor and a fifth resistor;

[0017] The backward control end and the forward control end of the motor driver are electrically connected to the control unit respectively, the forward output end of the motor driver is electrically connected to the anode of the sixth diode via the second diode, the third diode, the fourth diode and the fifth diode, the forward output end of the motor driver is also electrically connected to the anode of the sixth diode, the cathode of the sixth diode is connected to the first end of the third resistor, the second end of the third resistor is electrically connected to the control unit and is electrically connected to the ground via the fifth resistor, the backward output end of the motor driver is electrically connected to the first end of the fourth resistor via the seventh diode, and the second end of the fourth resistor is electrically connected to the second end of the third resistor;

[0018] Among them, the electrical connection node between the second diode and the third diode is the first forward drive signal output terminal of the drive unit, the electrical connection node between the third diode and the fourth diode is the second forward drive signal output terminal of the drive unit, the electrical connection node between the fourth diode and the fifth diode is the third forward drive signal output terminal of the drive unit, and the backward output terminal of the motor driver is the backward drive signal output terminal of the drive unit.

[0019] Preferably, it also includes a power supply unit electrically connected to the speed regulating unit, the delay adjusting unit, the control unit, the display unit and the drive unit for supplying power to each unit.

[0020] Preferably, the toy car driving circuit further comprises a status indicating unit electrically connected to the control unit and used for displaying the circuit working status.

[0021] The utility model also constructs a toy car driving device, which comprises a shell, in which the toy car driving circuit mentioned above is arranged.

[0022] Preferably, the housing comprises a bottom shell and a surface shell detachably connected to the bottom shell;

[0023] A cavity is provided in the bottom shell, and the toy car driving circuit is placed in the cavity;

[0024] The face shell is provided with a first through hole, a second through hole and a third through hole. When the face shell is connected to the bottom shell, the first through hole can reveal the display content of the display unit, and the speed regulation unit and the delay adjustment unit protrude from the second through hole and the third through hole respectively for user operation.

[0025] Preferably, a back electrode and three forward electrodes that can be electrically connected to the toy car are provided on the side wall of the bottom shell;

[0026] The backward electrode is electrically connected to the backward driving signal output terminal of the driving unit, and the three forward electrodes are electrically connected to the first forward driving signal output terminal, the second forward driving signal output terminal and the third forward driving signal output terminal of the driving unit respectively.

[0027] The implementation of the utility model has the following beneficial effects: providing a toy car driving circuit, which can control the departure time of the toy car according to the user's operation delay, and can also control the speed of the toy car, and can display the setting parameters of the car speed and delay, so that the user can more accurately adjust the speed of the toy car and the time required for delayed departure, thereby improving the fun and safety of the toy car and playing a positive role in improving user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0029] Figure 1 is a circuit structure block diagram of a toy car driving circuit in some embodiments of the utility model;

[0030] Figure 2 is a circuit schematic diagram of a display unit in some embodiments of the utility model;

[0031] Figure 3 It is a circuit schematic diagram of a speed regulating unit, a delay regulating unit and a control unit in some embodiments of the utility model;

[0032] Figure 4 is a circuit schematic diagram of a drive unit in some embodiments of the utility model;

[0033] Figure 5is a circuit schematic diagram of a power supply unit in some embodiments of the utility model;

[0034] Figure 6 is a top view of the bottom shell in some embodiments of the utility model;

[0035] Figure 7 is a top view of the face shell in some embodiments of the utility model;

[0036] Figure 8 It is a left view of the bottom shell in some embodiments of the present utility model. DETAILED DESCRIPTION

[0037] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0038] In the following description, it is necessary to understand that the directions or positional relationships indicated by “front”, “back”, “up”, “down”, “left”, “right”, “longitudinal”, “horizontal”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “head”, and “tail”, etc., are based on the directions or positional relationships shown in the accompanying drawings, and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution, and do not indicate that the device or element referred to must have a specific direction. Therefore, they should not be understood as a limitation on the present utility model.

[0039] Figure 1 This is a circuit structure block diagram of the toy car driving circuit in some embodiments of the utility model. The circuit can not only control the departure time of the toy car according to the user's operation delay, but also control the speed of the toy car, and can display the setting parameters of the car speed and delay, so that the user can more accurately adjust the speed of the toy car and the time required for delayed departure, which improves the fun and safety of the toy car and plays a positive role in improving the user experience. Figure 1 The circuit includes a speed regulating unit 1, a delay regulating unit 2, a control unit 3, a display unit 4 and a driving unit 5.

[0040] The speed regulating unit 1 is used to output a speed regulating signal according to the user's operation on it.

[0041] In some embodiments, Figure 2 As shown, the speed control unit 1 includes a first potentiometer RV1. A first end of the first potentiometer RV1 is electrically connected to a first DC voltage (i.e., 3.3V), a second end of the first potentiometer RV1 is grounded, and an adjustable end of the first potentiometer RV1 is electrically connected to the control unit 3. Specifically, the first potentiometer RV1 may be a knob-type potentiometer, so that a user can control the voltage of the speed control signal input to the control unit 3 by rotating the knob of the potentiometer, so that the control unit 3 can control the speed of the toy car based on the voltage of the speed control signal.

[0042] The delay adjustment unit 2 is used to output a delay adjustment signal according to the user's operation on it.

[0043] In some embodiments, Figure 2 As shown, the delay adjustment unit 2 includes a second potentiometer RV2; a first end of the second potentiometer RV2 is electrically connected to the first DC voltage, a second end of the second potentiometer RV2 is grounded, and an adjustable end of the second potentiometer RV2 is electrically connected to the control unit 3. Specifically, the second potentiometer RV2 can be a knob-type potentiometer, so that the user can control the voltage of the delay adjustment signal input to the control unit 3 by rotating the knob, so that the control unit 3 can control the departure delay time of the toy car based on the voltage.

[0044] The control unit 3 is electrically connected to the speed regulating unit 1 and the delay regulating unit 2, and the control unit 3 is used to receive the speed regulating signal and the delay regulating signal and output the display signal and the drive control signal. Specifically, the control unit 3 may include an existing single-chip microcomputer U2, and the single-chip microcomputer U2 may output the display signal and the drive control signal according to the received speed regulating signal and the delay regulating signal.

[0045] The display unit 4 is electrically connected to the control unit 3. The display unit 4 is used to receive a display signal to display the speed gear and the delay time according to the display signal.

[0046] In some embodiments, Figure 3 As shown, the display unit 4 includes two sub-display units 41. The two sub-display units 41 are electrically connected to the control unit 3 respectively, wherein one sub-display unit 41 displays the speed gear position, and the other sub-display unit 41 displays the delay time.

[0047] Furthermore, if Figure 3 As shown, the sub-display unit 41 includes an N-bit digital tube SM1, and N switch tubes Q1, a first resistor R1 and a second resistor R2; wherein N is a natural number. The eight cathodes (including dp pole, g pole, f pole, e pole, d pole, c pole, b pole and a pole) of the N-bit digital tube SM1 are electrically connected to the control unit 3 respectively, the N common anodes of the N-bit digital tube SM1 are electrically connected to the output ends of the N switch tubes Q1 one by one, the input ends of the N switch tubes Q1 are electrically connected to the second DC voltage (i.e., VCC) respectively, the control ends of the N switch tubes Q1 are electrically connected to the control unit 3 by a first resistor R1 respectively, and the N second resistors R2 are electrically connected between the input ends and the control ends of the N switch tubes Q1 one by one. Specifically, the N-bit digital tube SM1 can be an existing multi-bit digital tube, and N represents the number of displayed digits of the digital tube, see Figure 3The working principle of each sub-display unit 41 is as follows: taking the number on the left as an example, when the number "1" needs to be displayed, the control unit 3 sets the b and c poles of the N-bit digital tube SM1 to a low level, while the other cathodes remain at a high level, and then controls the switch tube Q1 connected to the common anode of the left number to be turned on, so that the cathode set to a low level is turned on with the common anode, so that the left number will display the number "1". For example, when the middle number needs to display "0", the control unit 3 will turn off the switch tube Q1 connected to the left number, and then set the a, b, c, d, e and f poles of the N-bit digital tube SM1 to a low level, while the other cathodes remain at a high level, and then control the switch tube Q1 connected to the middle number to be turned on, so that the middle data will display the number "0". The same operation can make the right number also display the number "0". As long as the above process is repeated, under the afterglow effect of the light-emitting diode, the N-bit digital tube SM1 will continue to display "100". In addition, the sub-display unit 41 can indicate the gear position by displaying the size of the voltage value of the driving signal output by the driving unit 5. The larger the displayed value, the faster the speed of the toy car; and the other sub-display unit 41 can indicate the delay time by displaying the number of seconds. The larger the value, the longer the delay in the departure of the toy car.

[0048] Optionally, N is equal to 3, that is, the N-digit digital tube SM1 is a 3-digit digital tube.

[0049] In some embodiments, the switch tube Q1 may be a PNP transistor, wherein the emitter of the PNP transistor corresponds to the input end of the switch tube Q1, the collector of the PNP transistor corresponds to the output end of the switch tube Q1, and the base of the PNP transistor corresponds to the control end of the switch tube Q1. Of course, the switch tube Q1 may also be replaced by a PMOS tube.

[0050] The driving unit 5 is electrically connected to the control unit 3 , and is used to receive a driving control signal and output a driving signal for controlling the speed of the toy vehicle.

[0051] In some embodiments, Figure 4As shown, the drive unit 5 includes a motor driver U3, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a seventh capacitor C7. The power supply end of the motor driver U3 is electrically connected to the second DC voltage, the backward control end and the forward control end of the motor driver U3 are electrically connected to the control unit 3 respectively, the forward output end of the motor driver U3 is electrically connected to the anode of the sixth diode D6 via the second diode D2, the third diode D3, the fourth diode D4 and the fifth diode D5, the forward output end of the motor driver U3 is also electrically connected to the anode of the sixth diode D6, the cathode of the sixth diode D6, the first end of the third resistor R3, the second end of the third resistor R3 is electrically connected to the control unit 3, and is electrically connected to the ground via the fifth resistor R5, the backward output end of the motor driver U3 is electrically connected to the first end of the fourth resistor R4 via the seventh diode D7, the second end of the fourth resistor R4 is electrically connected to the second end of the third resistor R3, and is electrically connected to the ground via the seventh capacitor C7. Among them, the electrical connection node of the second diode D2 and the third diode D3 is the first forward drive signal output terminal of the drive unit 5, the electrical connection node of the third diode D3 and the fourth diode D4 is the second forward drive signal output terminal of the drive unit 5, the electrical connection node of the fourth diode D4 and the fifth diode D5 is the third forward drive signal output terminal of the drive unit 5, and the backward output terminal of the motor driver U3 is the backward drive signal output terminal of the drive unit 5.

[0052] Specifically, the motor driver U3 can be a motor driver chip of model RZ7886, and in the present embodiment, a plurality of forward drive signal output terminals are provided so as to enable the drive circuit to be connected to a plurality of tracks at the same time, so as to realize multi-track drive control; and the sixth diode D6 and the seventh diode D7 play a unidirectional conduction role, that is, whether the toy car is controlled to move forward or backward, the drive current input to the toy car can only be unidirectionally diverted to the voltage divider circuit composed of the third resistor R3, the fourth resistor R4 and the fifth resistor R5; for the voltage divider circuit, its function is to collect the drive current input to the toy car, and convert it into a voltage signal and input it to the control unit 3, so that the control unit 3 can know the working current of the toy car, and then determine the working state of the toy car based on the working current, wherein the working state includes but is not limited to the normal operation of the toy car, the stop of the toy car, and the short circuit fault of the toy car.

[0053] It should be noted that, in this embodiment, the first to third forward drive signal output terminals and the backward drive signal output terminals are connected to the set track, and through the existing technology, the toy car is placed on the track and can be electrically connected to the track. When the drive unit 5 outputs the drive signal, the toy car can be driven forward or backward. In addition, the actual connection relationship between the cathode and anode of the second to seventh diodes can be referred to Figure 4 , I will not go into details here.

[0054] In some embodiments, Figure 1 As shown, the toy car driving circuit also includes a power supply unit 6 connected to the speed regulating unit 1, the delay adjusting unit 2, the control unit 3, the display unit 4 and the driving unit for supplying power to each unit. Specifically, the power supply unit 6 can output a first DC voltage (i.e., 3.3V) and a second DC voltage (i.e., VCC) when the third DC voltage (i.e., 14V) is connected.

[0055] In some embodiments, Figure 5 As shown, the power supply unit 6 includes a first diode D1, a first capacitor C1, a second capacitor C2, a linear regulator U1, a third capacitor C3 and a fourth capacitor C4. The anode of the first diode D1 is connected to the third DC voltage, the cathode of the first diode D1 is electrically connected to the input end of the linear regulator U1, and is electrically connected to the ground through the first capacitor C1 and the second capacitor C2. The cathode of the first diode D1 is also used to output the second DC voltage. The output end of the linear regulator U1 is electrically connected to the ground through the third capacitor C3 and the fourth capacitor C4. The output end of the linear regulator U1 is used to output the first DC voltage.

[0056] In some embodiments, the power supply unit 6 further includes a power switch 61. The power switch 61 is connected in series between the third DC voltage and the anode of the first diode D1, wherein the power switch 61 may be an existing manual switch, so that the on and off of the third DC voltage can be controlled according to user operation.

[0057] In some embodiments, Figure 1 As shown, the toy car driving circuit also includes a status indicating unit 7 electrically connected to the control unit 3 and used to display the working status of the circuit. Specifically, the status indicating unit 7 (specific circuit is not shown) can be composed of a plurality of LED lamp beads, and the control unit 3 can control the corresponding LED lamp beads to light up and off by outputting different lamp bead control signals, thereby indicating the working status of the circuit. For example, when the toy car is running normally, a certain lamp bead is controlled to light up, and when the toy car is short-circuited, another lamp bead can be controlled to light up, thereby achieving an indication effect.

[0058] The utility model further provides a toy car driving device, comprising a housing 8, in which a toy car driving circuit provided by an embodiment of the utility model is arranged.

[0059] In some embodiments, Figure 6 and Figure 7 As shown, the housing includes a bottom shell 81 and a surface shell 82 detachably connected to the bottom shell 81 .

[0060] See also Figure 6, a cavity is provided in the bottom shell 81, and the toy car driving circuit is placed in the cavity. Specifically, the toy car driving circuit can be welded on the same circuit board, and then the circuit board is installed on the cavity of the bottom shell 81, so that the toy car driving circuit is fixed.

[0061] See also Figure 7 The front shell 82 is provided with a first through hole 821, a second through hole 822, a third through hole 823, a fourth through hole 824 and a fifth through hole 825. When the front shell 82 is connected to the bottom shell 81, the first through hole 821 can reveal the display content of the display unit 4, and the fourth through hole 824 can reveal the LED lamp beads in the status indication unit 7.

[0062] See also Figure 7 and Figure 8 When the surface shell 82 is connected to the bottom shell 81, the speed regulating unit 1 protrudes from the second through hole 822 for user operation; the delay adjusting unit 2 protrudes from the third through hole 823 for user operation; and the power switch 61 protrudes from the fifth through hole 825 for user operation.

[0063] In some embodiments, Figure 6 As shown, a backward electrode 811 and three forward electrodes 812 that can be electrically connected to the toy car are provided on the side wall of the bottom shell 81. The backward electrode 811 is electrically connected to the backward drive signal output terminal of the drive unit 5, and the three forward electrodes 812 are respectively electrically connected to the first forward drive signal output terminal, the second forward drive signal output terminal and the third forward drive signal output terminal of the drive unit 5. Specifically, the backward electrode 811 and the three forward electrodes 812 pass through the side wall of the bottom shell 81 respectively, and for each electrode, one end thereof is electrically connected to the corresponding drive signal output terminal, and the other end thereof is used to connect to the corresponding track.

[0064] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. A toy car driving circuit, characterized in that: include: A speed regulating unit for outputting a speed regulating signal; A delay adjustment unit for outputting a delay adjustment signal capable of controlling the delay time of the toy car's departure; A control unit electrically connected to the speed regulating unit and the delay regulating unit, configured to receive the speed regulating signal and the delay regulating signal and output a display signal and a driving control signal; a display unit electrically connected to the control unit and configured to receive the display signal and display the speed gear and the delay time, wherein the speed gear is the voltage value of the driving signal and the larger the value of the speed gear is, the faster the speed of the toy car is; and a driving unit electrically connected to the control unit and configured to receive the driving control signal and output a driving signal for controlling the speed of the toy vehicle; The display unit includes two sub-display units; The two sub-display units are electrically connected to the control unit respectively, wherein one of the sub-display units displays the speed gear, and the other sub-display unit displays the delay time; The sub-display unit includes an N-digit digital tube, N switch tubes, a first resistor and a second resistor; wherein N is a natural number; The eight cathodes of the N-digit digital tubes are electrically connected to the control unit respectively, the N common anodes of the N-digit digital tubes are electrically connected to the output ends of the N switch tubes one by one, the input ends of the N switch tubes are electrically connected to the second DC voltage respectively, the control ends of the N switch tubes are electrically connected to the control unit by one first resistor respectively, and the N second resistors are electrically connected between the input ends and the control ends of the N switch tubes one by one; The delay adjustment unit includes a second potentiometer; the first end of the second potentiometer is electrically connected to the first DC voltage, the second end is grounded, and the adjustable end is electrically connected to the control unit; wherein, the delay adjustment unit is a knob-type potentiometer, and the knob-type potentiometer outputs a delay adjustment signal to the control unit that can control the departure delay time according to user operation.

2. The toy car driving circuit according to claim 1, characterized in that: The speed regulating unit comprises a first potentiometer; a first end of the first potentiometer is electrically connected to a first DC voltage, a second end is grounded, and an adjustable end is electrically connected to the control unit.

3. The toy car driving circuit according to claim 1, characterized in that: The driving unit includes a motor driver, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, a third resistor, a fourth resistor and a fifth resistor; The backward control end and the forward control end of the motor driver are electrically connected to the control unit respectively, the forward output end of the motor driver is electrically connected to the anode of the sixth diode via the second diode, the third diode, the fourth diode and the fifth diode, the forward output end of the motor driver is also electrically connected to the anode of the sixth diode, the cathode of the sixth diode is connected to the first end of the third resistor, the second end of the third resistor is electrically connected to the control unit and is electrically connected to the ground via the fifth resistor, the backward output end of the motor driver is electrically connected to the first end of the fourth resistor via the seventh diode, and the second end of the fourth resistor is electrically connected to the second end of the third resistor; Among them, the electrical connection node between the second diode and the third diode is the first forward drive signal output terminal of the drive unit, the electrical connection node between the third diode and the fourth diode is the second forward drive signal output terminal of the drive unit, the electrical connection node between the fourth diode and the fifth diode is the third forward drive signal output terminal of the drive unit, and the backward output terminal of the motor driver is the backward drive signal output terminal of the drive unit.

4. The toy car driving circuit according to any one of claims 1 to 3, characterized in that: It also includes a power supply unit which is electrically connected to the speed regulating unit, the delay adjusting unit, the control unit, the display unit and the drive unit and is used to supply power to each unit.

5. The toy car driving circuit according to any one of claims 1 to 3, characterized in that: It also includes a status indicating unit electrically connected to the control unit and used to display the circuit working status.

6. A toy car driving device, characterized in that: The invention comprises a shell, wherein the toy car driving circuit as claimed in any one of claims 1 to 5 is arranged inside the shell.

7. The toy car driving device according to claim 6, characterized in that: The housing comprises a bottom shell and a surface shell detachably connected to the bottom shell; A cavity is provided in the bottom shell, and the toy car driving circuit is placed in the cavity; The face shell is provided with a first through hole, a second through hole and a third through hole. When the face shell is connected to the bottom shell, the first through hole can reveal the display content of the display unit, and the speed regulation unit and the delay adjustment unit protrude from the second through hole and the third through hole respectively for user operation.

8. The toy car driving device according to claim 7, characterized in that: The side wall of the bottom shell is provided with a backward electrode and three forward electrodes which can be electrically connected to the toy car; The backward electrode is electrically connected to the backward driving signal output terminal of the driving unit, and the three forward electrodes are electrically connected to the first forward driving signal output terminal, the second forward driving signal output terminal and the third forward driving signal output terminal of the driving unit respectively.

Images