Transmitter lamp drive circuit, infrared transmitter circuit, touch screen and interactive tablet

Abstract

The utility model provides an emission lamp driving circuit, an infrared emission circuit, a touch screen and an interactive flat panel, comprising: a current driving module, a switch module, a switch acceleration module and a gain amplification module; the input end of the current driving module is used to receive a current regulation control signal, the output end of the current driving module is connected to the input end of the gain amplification module, and the output end of the gain amplification module is connected to the emission lamp; the first end of the switch module is connected to the driving end of the gain amplification module, the second end of the switch module is grounded, the driving end of the switch module is connected to the first end of the switch acceleration module, and the second end of the switch acceleration module is used to receive a switch control signal.

Description

Technical Field

[0001] The utility model relates to the technical field of driving an emitting lamp tube, and in particular to an emitting lamp tube driving circuit, an infrared emitting circuit, a touch screen and an interactive flat panel. Background Art

[0002] The principle of the touch screen is to arrange the transmitting lamps and receiving lamps around the display screen, and control each transmitting lamp to turn on and off in turn through the MCU, and the receiving lamps receive the light signals from each transmitting lamp in turn, convert them into electrical signals and output them to the MCU for collection and processing. By detecting the changes in the collected signals, it is determined whether the light is blocked by the touch object, thereby realizing the touch function. Among them, the on and off of the transmitting lamps are realized by the switch control circuit, and the switching speed of the switch control circuit has a great influence on the scanning frame rate and performance of the touch screen.

[0003] Existing transmitting lamp control circuit is as follows Figure 1 As shown, Figure 1 In the embodiment, when the switch control signal V2 drives the MOS tube Q3 to turn off, the current amplifier Q2 is turned on by the current emitted by the emitter follower Q1, and the current amplifier Q2 outputs the amplified current to drive the infrared emitting lamp to turn on. However, since the MOS tube Q3 and the circuit generally have parasitic capacitance, when the switch control signal V2 changes the high and low levels of the output, the switching speed of the MOS tube Q3 is affected, thereby reducing the switching speed of the emitting lamp, resulting in a reduction in the scanning frame rate of the touch screen. Therefore, the emitting lamp control circuit in the prior art has a technical defect that the switching speed of the emitting lamp is slow. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies in the prior art and to provide an emitting lamp driving circuit, an infrared emitting circuit, a touch screen and an interactive tablet, which can increase the switching rate of the switch module and the switching speed of the emitting lamp.

[0005] The first embodiment of the utility model provides a transmitting lamp driving circuit, an infrared transmitting circuit, a touch screen and an interactive tablet, including: a current driving module, a switch module, a switch acceleration module and a gain amplification module;

[0006] The input end of the current driving module is used to receive a current regulation control signal, the output end of the current driving module is connected to the input end of the gain amplification module, and the output end of the gain amplification module is connected to the emission lamp;

[0007] The first end of the switch module is connected to the driving end of the gain amplifier module, the second end of the switch module is grounded, the driving end of the switch module is connected to the first end of the switch acceleration module, and the second end of the switch acceleration module is used to receive a switch control signal.

[0008] The second embodiment of the utility model provides an infrared transmitting circuit, comprising: the transmitting lamp tube driving circuit and the transmitting lamp tube as described above, wherein the transmitting lamp tube driving circuit is connected to the transmitting lamp tube, and the transmitting lamp tube driving circuit controls the switching state of the transmitting lamp tube.

[0009] The third embodiment of the utility model provides a touch screen, comprising: a screen, an emitting lamp tube, and the emitting lamp tube driving circuit as described above, wherein the emitting lamp tube is arranged on the periphery of the screen, the lamp tube emitted by the emitting lamp tube covers the screen, the emitting lamp tube driving circuit is connected to the emitting lamp tube, and the emitting lamp tube driving circuit controls the on / off state of the emitting lamp tube.

[0010] The fourth embodiment of the utility model provides an interactive tablet, comprising: a display screen, an emitting lamp tube, and the emitting lamp tube driving circuit as described above, wherein the emitting lamp tube is arranged on the periphery of the display screen, the lamp tube emitted by the emitting lamp tube covers the display screen, the emitting lamp tube driving circuit is connected to the emitting lamp tube, and the emitting lamp tube driving circuit controls the on / off state of the emitting lamp tube.

[0011] Compared with the prior art, the first end of the switch module of the utility model is connected to the driving end of the gain amplifier module, the second end of the switch module is grounded, the driving end of the switch module is connected to the first end of the switch acceleration module, and the second end of the switch acceleration module is used to receive the switch control signal. The switch acceleration module can quickly switch the switch control signal to the driving end of the switch module to achieve rapid control of the on-state of the switch module, so as to quickly control the on-state of the gain amplifier module, thereby quickly controlling the switch of the emitting lamp tube, and achieving the technical effect of increasing the switching rate of the switch module and the switching speed of the emitting lamp tube.

[0012] In order to more clearly understand the present invention, the specific implementation of the present invention will be described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic diagram of a prior art emission lamp driving circuit according to an embodiment of the present invention.

[0014] Figure 2 The figure is a circuit diagram of an emitting lamp driving circuit according to an embodiment of the utility model.

[0015] Figure 3 The figure is a circuit diagram of a switch acceleration module according to an embodiment of the present invention.

[0016] Figure 4 The figure is a signal diagram of a transmitting lamp driving circuit according to an embodiment of the present invention.

[0017] Figure 5 It is a schematic diagram of a secondary acceleration module according to an embodiment of the utility model.

[0018] Figure 6 The figure is a circuit diagram of a secondary acceleration module according to an embodiment of the present invention.

[0019] Figure 7 The figure is a schematic diagram of the structure of an infrared transmitting circuit according to an embodiment of the utility model.

[0020] Figure 8 The figure is a schematic structural diagram of a touch screen according to an embodiment of the present utility model.

[0021] Fig. 9 The figure is a schematic diagram of the structure of an interactive tablet according to an embodiment of the present utility model.

[0022] 11. Current driving module; Q3. Switch module; 15. Switch acceleration module; 17. Gain amplification module; V1. Current regulation control signal; 19. Sub-acceleration module; V2. Switch control signal; Q1. Emitter follower; Q2. Current amplifier; R1. Current limiting resistor; R2. Second shunt resistor; R3. Second resistor; R4. First resistor; R5. First shunt resistor; C1. Capacitor; LED, emitting lamp; 100. Infrared emitting circuit; 201. Screen; 301. Display screen. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The principle of the touch screen is to arrange the transmitting lamps and receiving lamps around the display screen, and control each transmitting lamp to turn on and off in turn through the MCU, and the receiving lamps receive the light signals from each transmitting lamp in turn, convert them into electrical signals and output them to the MCU for collection and processing. By detecting the changes in the collected signals, it is determined whether the light is blocked by the touch object, thereby realizing the touch function. Among them, the on and off of the transmitting lamps are realized by the switch control circuit, and the switching speed of the switch control circuit has a great influence on the scanning frame rate and performance of the touch screen.

[0025] Existing transmitting lamp control circuit is as follows Figure 1 As shown, Figure 1In the embodiment, when the switch control signal V2 drives the MOS tube Q3 to turn off, the current amplifier Q2 is turned on by the current emitted by the emitter follower Q1, and the current amplifier Q2 outputs the amplified current to drive the infrared emitting lamp to turn on. However, since the MOS tube Q3 and the circuit generally have parasitic capacitance, when the switch control signal V2 changes the high and low levels of the output, the switching speed of the MOS tube Q3 is affected, thereby reducing the switching speed of the emitting lamp, resulting in a reduction in the scanning frame rate of the touch screen. Therefore, the emitting lamp control circuit in the prior art has a technical defect that the switching speed of the emitting lamp is slow.

[0026] The present application adds a switch acceleration module 15 in the circuit so that the driving end of the switch module Q3 is connected to the first end of the switch acceleration module 15. The second end of the switch acceleration module 15 is used to receive the switch control signal V2. When the switch control signal V2 is switched, it can quickly act on the driving end of the gain amplifier module 17, thereby accelerating the speed at which the on-state of the gain amplifier module 17 responds to the switch control signal V2, thereby achieving the technical effect of increasing the switching rate of the switch module Q3 and increasing the switching speed of the emitting lamp.

[0027] See also Figure 2 , which is an emitting lamp driving circuit of an embodiment of the utility model, comprising: a current driving module 11, a switch module Q3, a switch acceleration module 15 and a gain amplification module 17;

[0028] The input end of the current driving module 11 is used to receive the current regulation control signal V1, the output end of the current driving module 11 is connected to the input end of the gain amplifying module 17, and the output end of the gain amplifying module 17 is connected to the emitting lamp;

[0029] The first end of the switch module Q3 is connected to the driving end of the gain amplifier module 17, the second end of the switch module Q3 is grounded, the driving end of the switch module Q3 is connected to the first end of the switch acceleration module 15, and the second end of the switch acceleration module 15 is used to receive the switch control signal V2.

[0030] Among them, when the current regulation control signal V1 drives the current driving module 11 to be turned on, the common end of the current driving module 11 receives the current input of the reference power supply, so that the current driving module 11 outputs current to the driving end of the gain amplifier module 17. At this time, the switch module Q3 can quickly respond to receiving the switch control signal V2 through the switch acceleration module 15 and switch the conduction state. When the switch module Q3 is turned on, the driving end of the gain amplifier module 17 is grounded through the switch module Q3, so that the gain amplifier module 17 is disconnected, and the emitting lamp connected to the gain amplifier module 17 is turned off; when the switch module Q3 is disconnected, the driving end of the gain amplifier module 17 is only connected to the output end of the current driving module 11. Under the action of the current output by the current driving module 11, the gain amplifier module 17 is turned on, and the emitting lamp connected to the gain amplifier module 17 is turned on.

[0031] Compared with the prior art, the first end of the switch module Q3 of the utility model is connected to the driving end of the gain amplifier module 17, the second end of the switch module Q3 is grounded, the driving end of the switch module Q3 is connected to the first end of the switch acceleration module 15, and the second end of the switch acceleration module 15 is used to receive the switch control signal V2. The switch acceleration module 15 can quickly switch the switch control signal V2 to the driving end of the switch module Q3, so as to quickly control the conduction state of the switch module Q3, so as to quickly control the conduction state of the gain amplifier module 17, thereby quickly controlling the switch of the emitting lamp tube, and realizing the technical effect of increasing the switch rate of the switch module Q3 and the switch speed of the emitting lamp tube.

[0032] See also Figure 3-4 In a feasible embodiment, the switch acceleration module 15 includes a capacitor and a first resistor; one end of the capacitor is the first end of the switch acceleration module 15, and the other end of the capacitor is the second end of the switch acceleration module 15; the first resistor is connected in parallel with both ends of the capacitor.

[0033] Among them, since the voltage across the capacitor cannot change suddenly, when the switch control signal V2 changes from a low level to a high level, the capacitor will cause the level of the driving end of the switch module Q3 to quickly change to a high level, and when the switch control signal V2 changes from a high level to a low level, the capacitor will cause the level of the driving end of the switch module Q3 to quickly change to a low level, and the first resistor provides a charging and discharging reflux path for the capacitor, so the switch module Q3 will maintain a high level as the switch control signal V2 maintains a high level, and the switch module Q3 will maintain a low level as the switch control signal V2 maintains a low level.

[0034] In this embodiment, the switching speed of the switch module Q3 in response to the switch control signal V2 can be increased by an RC circuit composed of a capacitor and a first resistor, thereby quickly and accurately controlling the switching state of the switch module Q3 and thus quickly and accurately controlling the switching speed of the emitting lamp.

[0035] See also Figure 5-6 In a feasible embodiment, it also includes a sub-acceleration module 19; the sub-acceleration module 19 includes a first end and a second end, the first end of the sub-acceleration module 19 is connected to the second end of the switch acceleration module 15, and the second end of the sub-acceleration module 19 is connected to the first end of the switch module Q3.

[0036] The secondary acceleration module 19 includes a diode D3 and a first shunt resistor R5; the anode of the diode D3 is the first end of the secondary acceleration module 19, the cathode of the diode D3 is the second end of the secondary acceleration module 19, and the first end of the switch acceleration module 15 is grounded via the first shunt resistor R5. The diode D3 can be a Schottky diode.

[0037] A resistor may be added to the auxiliary acceleration module 19, one end of which is connected to the first end of the switch acceleration module 15, and the other end of which is connected to the anode of the diode D3, so as to limit the current output from the switch acceleration module 15 to the diode D3.

[0038] In the present embodiment, since the switch module Q3 is a silicon tube, the forward voltage drop VF of the Schottky diode is smaller than the PN junction of the switch module Q3. When the switch module Q3 is turned on, most of the base current that should flow through the switch module Q3 flows away through the diode, making the base current of the switch module Q3 very small. Therefore, the on state of the switch module Q3 is very close to the off state, avoiding deep saturation, saving the time for the switch module Q3 to turn on and off from saturation, making the change curve of the switching state of the switch module Q3 shift earlier, and improving the switching speed of the emitting lamp tube.

[0039] In a feasible embodiment, the switch module Q3 includes a field effect tube; the source of the field effect tube is the first end of the switch module Q3, the drain of the field effect tube is the second end of the switch module Q3, and the gate of the field effect tube is the driving end of the switch module Q3.

[0040] Alternatively, the switch module Q3 includes a transistor; the collector of the transistor is the first end of the switch module Q3, the emitter of the transistor is the second end of the switch module Q3, and the base of the transistor is the driving end of the switch module Q3.

[0041] Among them, when the switch module Q3 adopts a field effect tube or a transistor, the switch acceleration module 15 can quickly respond to the switch control signal V2, thereby switching the conduction state. Moreover, since the RC circuit composed of the capacitor and the first resistor can quickly control the transistor to switch the conduction state through the current, a transistor can be used instead of a MOS tube as the switch module Q3, which can reduce the cost of the circuit.

[0042] In this embodiment, a field effect transistor or a triode can be used as the switch module Q3 to achieve the effect of quickly responding to the switch control signal V2 through the switch acceleration module 15, thereby achieving the technical effect of improving the reaction speed of the switch module Q3.

[0043] In a feasible embodiment, the gain amplifier module 17 includes a second resistor R3 and a current amplifier Q2; the input end of the current amplifier Q2 is connected to the output end of the current driving module 11 via the second resistor R3, and the output end of the current amplifier Q2 is connected to the emitting lamp tube; the common end of the current amplifier Q2 is grounded.

[0044] Among them, the second resistor R3 can limit the magnitude of the current output by the current driving module 11 to the driving end of the current amplifier Q2, thereby protecting the current amplifier Q2 and preventing the current amplifier Q2 from being damaged due to excessive input current. The current amplifier Q2 can amplify the current output by the current driving module 11, thereby outputting the amplified current to the emitting lamp to drive the emitting lamp to turn on.

[0045] In this embodiment, the current output by the current driving module 11 can be successfully amplified through the second resistor R3 and the current amplifier, so that the emitting lamp can be turned on safely.

[0046] In a feasible embodiment, the current amplifier includes a triode; the base of the triode is the input end of the current amplifier, the collector of the triode is the output end of the current amplifier, and the emitter of the triode is the common end of the current amplifier.

[0047] Among them, since the circuit needs to amplify the current, a triode can be used as a current amplifier to provide the amplified current to the emitting lamp tube, so that the emitting lamp tube can be turned on smoothly with the support of the amplified current.

[0048] In this embodiment, the triode can be used as a current amplifier to amplify the current to support the emitting lamp tube so that the emitting lamp tube can be turned on smoothly.

[0049] In a feasible embodiment, the current driving module 11 includes a current limiting resistor R1 and an emitter follower Q1;

[0050] The common end of the emitter follower Q1 is connected to the reference power supply via the current limiting resistor R1 , the input end of the emitter follower Q1 is the input end of the current driving module 11 , and the output end of the emitter follower Q1 is the output end of the current driving module 11 .

[0051] Among them, the emitter follower Q1 responds to the current regulation control signal V1 indicating conduction and is turned on. At this time, the emitter follower Q1 can receive the current output by the reference power supply through the current limiting resistor R1 to output the current to the driving end of the gain amplifier module 17 to support the current amplification effect of the gain amplifier module 17, so that the gain amplifier module 17 is turned on and can smoothly drive the emitter lamp to light up.

[0052] Optionally, since the emitter follower Q1 is used to output current in response to the current regulation control signal V1, the emitter follower Q1 can adopt a transistor, in which case the collector of the transistor is the common end of the emitter follower Q1, the base of the transistor is the input end of the emitter follower Q1, and the emitter of the transistor is the output end of the emitter follower Q1.

[0053] In this embodiment, the current of the reference power supply can be output to the driving end of the gain amplifier module 17 through the current limiting resistor R1 and the emitter follower Q1 in response to the control of the current regulation control signal V1 to support the current amplification effect of the gain amplifier module 17.

[0054] In a feasible embodiment, the current driving module 11 further includes a second shunt resistor R2 , and the output end of the emitter follower Q1 is grounded via the second shunt resistor R2 .

[0055] The second shunt resistor R2 is used to shunt the current output by the emitter follower to prevent the circuit from being short-circuited or the components of the circuit from being damaged due to excessive current output by the emitter follower.

[0056] In this embodiment, the second shunt resistor R2 can be used to shunt the current output by the emitter follower, thereby protecting components in the circuit.

[0057] See also Figure 7 The second embodiment of the utility model provides an infrared transmitting circuit 100, including: the transmitting lamp tube driving circuit 11 and the transmitting lamp tube LED as above, the transmitting lamp tube driving circuit is connected to the transmitting lamp tube, and the transmitting lamp tube driving circuit controls the switching state of the transmitting lamp tube.

[0058] It should be noted that the infrared transmitting circuit 100 provided in the second embodiment of the present application and the transmitting lamp driving circuit 11 of the first embodiment of the present application have the same concept, and the implementation process thereof is detailed in the first embodiment and will not be repeated here.

[0059] See also Figure 8The third embodiment of the utility model provides a touch screen, including: a screen 201, an emitting lamp tube LED, and the emitting lamp tube driving circuit 11 as described above, the emitting lamp tube is arranged on the periphery of the screen, the lamp tube emitted by the emitting lamp tube covers the screen 201, the emitting lamp tube driving circuit is connected to the emitting lamp tube, and the emitting lamp tube driving circuit controls the on / off state of the emitting lamp tube.

[0060] It should be noted that the touch screen provided in the third embodiment of the present application and the emitting lamp driving circuit of the first embodiment of the present application have the same concept, and the implementation process thereof is detailed in the first embodiment and will not be repeated here.

[0061] See also Fig. 9 The fourth embodiment of the utility model provides an interactive tablet, including: a display screen 301, an emitting lamp tube LED, and the above-mentioned emitting lamp tube driving circuit 11, the emitting lamp tube LED is arranged on the periphery of the display screen, the lamp tube emitted by the emitting lamp tube covers the display screen 301, the emitting lamp tube driving circuit is connected to the emitting lamp tube, and the emitting lamp tube driving circuit controls the on / off state of the emitting lamp tube.

[0062] It should be noted that the interactive tablet provided in the fourth embodiment of the present application and the emitting lamp driving circuit of the first embodiment of the present application belong to the same concept, and its embodiment and implementation process is detailed in the first embodiment and will not be repeated here.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A driving circuit for an emitting lamp, characterized in that: include: A current driving module (11), a switch module (Q3), a switch acceleration module (15) and a gain amplification module (17); The input end of the current driving module (11) is used to receive a current regulation control signal (V1), the output end of the current driving module (11) is connected to the input end of the gain amplification module (17), and the output end of the gain amplification module (17) is connected to the emission lamp tube; The first end of the switch module (Q3) is connected to the driving end of the gain amplification module (17), the second end of the switch module (Q3) is grounded, the driving end of the switch module (Q3) is connected to the first end of the switch acceleration module (15), and the second end of the switch acceleration module (15) is used to receive a switch control signal (V2).

2. The emitting lamp driving circuit according to claim 1, characterized in that: The switch acceleration module (15) comprises a capacitor and a first resistor; one end of the capacitor is the first end of the switch acceleration module (15), and the other end of the capacitor is the second end of the switch acceleration module (15); the first resistor is connected in parallel with both ends of the capacitor.

3. The emitting lamp driving circuit according to claim 1 or 2, characterized in that: It also includes a secondary acceleration module; the secondary acceleration module includes a first end and a second end, the first end of the secondary acceleration module is connected to the second end of the switch acceleration module (15), and the second end of the secondary acceleration module is connected to the first end of the switch module (Q3).

4. The emitting lamp driving circuit according to claim 3, characterized in that: The secondary acceleration module comprises a diode and a first shunt resistor; the anode of the diode is the first end of the secondary acceleration module, the cathode of the diode is the second end of the secondary acceleration module, and the first end of the switch acceleration module (15) is grounded via the first shunt resistor.

5. The emitting lamp driving circuit according to any one of claims 1 or 2, characterized in that: The switch module (Q3) comprises a field effect tube; the source of the field effect tube is the first end of the switch module (Q3), the drain of the field effect tube is the second end of the switch module (Q3), and the gate of the field effect tube is the driving end of the switch module (Q3); Alternatively, the switch module (Q3) comprises a transistor; the collector of the transistor is the first end of the switch module (Q3), the emitter of the transistor is the second end of the switch module (Q3), and the base of the transistor is the driving end of the switch module (Q3).

6. The emitting lamp driving circuit according to any one of claims 1 or 2, characterized in that: The gain amplification module (17) comprises a second resistor and a current amplifier; the input end of the current amplifier is connected to the output end of the current driving module (11) via the second resistor, and the output end of the current amplifier is connected to the emitting lamp tube; the common end of the current amplifier is grounded.

7. The emitting lamp driving circuit according to claim 6, characterized in that: The current amplifier comprises a transistor; the base of the transistor is the input end of the current amplifier, the collector of the transistor is the output end of the current amplifier, and the emitter of the transistor is the common end of the current amplifier.

8. The emitting lamp driving circuit according to any one of claims 1 or 2, characterized in that: The current driving module (11) comprises a current limiting resistor and an emitter follower (Q1); The common end of the emitter follower (Q1) is connected to a reference power supply via the current limiting resistor, the input end of the emitter follower (Q1) is the input end of the current driving module (11), and the output end of the emitter follower (Q1) is the output end of the current driving module (11).

9. The emitting lamp driving circuit according to claim 8, characterized in that: The current driving module (11) further comprises a second shunt resistor, and the output end of the emitter follower (Q1) is grounded via the second shunt resistor.

10. An infrared transmitting circuit, characterized in that: include: The emitting lamp tube driving circuit and the emitting lamp tube as described in any one of claims 1 to 9, wherein the emitting lamp tube driving circuit is connected to the emitting lamp tube, and the emitting lamp tube driving circuit controls the on / off state of the emitting lamp tube.

11. A touch screen, characterized in that: include: A screen, an emitting lamp tube, and an emitting lamp tube driving circuit as described in any one of claims 1 to 9, wherein the emitting lamp tube is arranged on the periphery of the screen, the lamp tube emitted by the emitting lamp tube covers the screen, the emitting lamp tube driving circuit is connected to the emitting lamp tube, and the emitting lamp tube driving circuit controls the on / off state of the emitting lamp tube.

12. An interactive tablet, characterized in that: include: A display screen, an emitting lamp tube, and an emitting lamp tube driving circuit as described in any one of claims 1 to 9, wherein the emitting lamp tube is arranged on the periphery of the display screen, the lamp tube emitted by the emitting lamp tube covers the display screen, the emitting lamp tube driving circuit is connected to the emitting lamp tube, and the emitting lamp tube driving circuit controls the on / off state of the emitting lamp tube.

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