CN218122629U - Infrared touch screen and electronic equipment - Google Patents

Abstract

The application provides an infrared touch screen and electronic equipment, this infrared touch screen includes a plurality of parallelly connected luminescent device, each luminescent device's first end is used for being connected with the anodal electricity of power respectively, infrared touch screen still includes a plurality of current control circuit, current control circuit's first end is connected with luminescent device's second end one-to-one electricity, current control circuit's second end is used for being connected with power negative pole electricity, current control circuit is used for adjusting corresponding luminescent device's operating current. Through a plurality of current regulation circuits, the current that can flow through corresponding luminescent device through a plurality of current regulation circuit control has been guaranteed for the operating current of a plurality of luminescent devices of flowing through can guarantee that it sends required infrared signal intensity, has alleviated because luminescent device's circuit loss and the backward flow circuit length of electric current cause the terminal luminescent device's of establishing ties problem such as effective switching voltage, electric current not enough, has guaranteed that the luminescent device's of each series connection voltage and the uniformity of electric current are better.

Description

Infrared touch screen and electronic equipment

Technical Field

The application relates to the field of infrared touch screens, in particular to an infrared touch screen and electronic equipment.

Background

At present, in an infrared touch frame of a large-size screen on the market, the intensity of an infrared signal is controlled mainly by adjusting the current change of an infrared emission lamp tube (within the range required by the specification of the lamp tube, the larger the current flowing through the lamp tube is, the stronger the infrared signal is), and then the touch function is realized by processing of an infrared sensor receiving circuit and a software algorithm, fig. 1 and fig. 2 show a current adjusting and controlling mode of the infrared emission lamp tube, wherein current (voltage) loops of the lamp tube are mainly a circuit board power supply 101 (a power supply positive electrode 102 and a power supply negative electrode 103) to form a so-called current closed loop, namely a lamp tube current (voltage) bus control mode, but the scheme has certain problems: if the number of the controlled boards is large, and the boards are connected in series, at this time, the link of the control connection of the circuit board power supplies 101 is very long, and the circuit board power supplies 101 are connected with a single current regulating circuit 104, which easily causes an overlong current (voltage) loop, especially for the emission lamp tube of the tail board, the current (voltage) loop is close to twice the length when all the circuit board power supplies 101 are connected in series, as shown in fig. 2, therefore, the return circuit of the current (voltage) is too long, which causes a large part of power loss of the power supply controlling the lamp tube on the return circuit, thereby causing the lamp tube switch current (voltage) of the back board not to be increased, the infrared signal intensity of the lamp tube not to be synchronously increased, the consistency and reliability of the infrared signal intensity cannot be ensured, and the application prospect and market demand of the infrared touch frame technology are influenced.

The above information disclosed in this background section is only for enhancement of understanding of the background of the technology described herein and, therefore, it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

The main object of this application is to provide an infrared touch screen and electronic equipment to solve the relatively poor problem of the uniformity of each infrared transmitting tube's signal strength among the prior art in the infrared touch frame.

According to an aspect of the present application, an infrared touch screen is provided, the infrared touch screen includes a plurality of parallelly connected light emitting devices, each the first end of the light emitting device is used for being connected with the positive electricity of power, the infrared touch screen still includes a plurality of current regulating circuit, the first end of current regulating circuit with the second end one-to-one of light emitting device is connected electrically, the second end of current regulating circuit is used for being connected with power negative pole electricity, current regulating circuit is used for adjusting the correspondence the operating current of light emitting device.

Optionally, the infrared touch screen further includes a plurality of first switching devices, a first end of each of the first switching devices is used for being electrically connected to the positive electrode of the power supply, and a second end of each of the first switching devices is electrically connected to the first end of the corresponding light emitting device in a one-to-one correspondence.

Optionally, the first switching device includes a first triode, a base of the first triode is used for receiving a pulse signal, one of a collector or an emitter of the first triode is used for electrically connecting with the positive electrode of the power supply, and the other of the collector or the emitter of the first triode is electrically connected with the first end of the corresponding light emitting device.

Optionally, the infrared touch screen further includes a plurality of second switching devices, first ends of the second switching devices are electrically connected to second ends of the light emitting devices in a one-to-one correspondence, and second ends of the second switching devices are electrically connected to the first end of the current adjusting circuit in a one-to-one correspondence.

Optionally, the second switching device includes a second triode, a base of the second triode is used for receiving a pulse signal, one of a collector or an emitter of the second triode is electrically connected to the second end of the corresponding light emitting device, and the other of the collector or the emitter of the second triode is electrically connected to the first end of the corresponding current regulating circuit.

Optionally, the infrared touch screen further comprises a plurality of circuit boards, each circuit board comprises an anode interface and a cathode interface, the light emitting devices and the current regulating circuits are respectively located on the circuit boards in a one-to-one correspondence manner, a first end of each light emitting device is used for being electrically connected with the anode of the power supply through the anode interface, and a second end of each current regulating circuit is used for being electrically connected with the cathode of the power supply through the cathode interface.

Optionally, the infrared touch screen further includes a power supply, and the power supply includes the power supply positive electrode and the power supply negative electrode.

Optionally, the current regulating circuit is a constant current driving circuit, a constant voltage driving circuit or a voltage current control circuit, wherein the voltage current control circuit is a circuit built by discrete devices.

Optionally, the light emitting device comprises an infrared light emitting diode.

According to another aspect of the present application, an electronic device is provided, which includes the infrared touch screen.

Use the technical scheme of this application, infrared touch-sensitive screen include a plurality of parallelly connected luminescent device, each luminescent device's first end is used for being connected with the anodal electricity of power respectively, infrared touch-sensitive screen still includes a plurality of current control circuit, current control circuit's first end with luminescent device's second end one-to-one electricity is connected, current control circuit's second end is used for being connected with power negative pole electricity, current control circuit is used for adjusting the correspondence luminescent device's operating current. Compare prior art's infrared touch frame, all infrared emission pipes all adjust through a current regulation circuit, cause the relatively poor problem of the uniformity of each infrared emission pipe's signal intensity, this application infrared touch screen through setting up a plurality of current regulation circuit, just current regulation circuit's first end with luminescent device's second end one-to-one electricity is connected, current regulation circuit's second end with power negative pole electricity is connected, has guaranteed to pass through a plurality of current regulation circuit control flows correspondingly luminescent device's electric current size to make it a plurality of to flow through luminescent device's operating current can guarantee that it sends required infrared signal intensity, has alleviated like this because luminescent device's circuit loss and the backward flow circuit length of electric current, causes the problem such as the effective switch voltage of the terminal luminescent device of establishing ties, electric current, has guaranteed that the voltage of each luminescent device of establishing ties in the infrared touch screen and the uniformity of electric current are better, has guaranteed that whole infrared touch screen's stability and reliability are better. Simultaneously, compare among the prior art, because the backward flow circuit length overlength of electric current leads to among the solution prior art the not enough problem of luminescent device's signal often can compensate the signal of loss in other respects to other relevant design circuit and the problem of cost have been increased, other relevant design circuit and cost need not to increase in this application, compensate the not enough or not enough problem of voltage of signal intensity, have guaranteed infrared touch screen's cost is lower.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application, and the description of the exemplary embodiments and illustrations of the application are intended to explain the application and are not intended to limit the application. In the drawings:

FIG. 1 is a schematic diagram of a prior art IR-emitting lamp;

FIG. 2 is a schematic circuit diagram of an infrared emission lamp of the prior art;

FIG. 3 shows a schematic structural diagram of an infrared touch screen according to an embodiment of the present application;

FIG. 4 shows a schematic circuit diagram of an infrared touch screen according to an embodiment of the present application;

FIG. 5 shows a schematic diagram of a switching device controlled light emitting lattice according to an embodiment of the present application;

FIG. 6 shows another switching device controlled light emitting dot matrix schematic according to embodiments of the present application.

Wherein the figures include the following reference numerals:

101. a circuit board power supply; 102. a power supply positive electrode; 103. a power supply cathode; 104. a current regulating circuit; 105. a light emitting device; 106. a first switching device; 107. a second switching device; 108. a positive electrode interface; 109. and a negative electrode interface.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.

As described in the background art, in order to solve the above problem, the present application provides an infrared touch screen and an electronic device, where the consistency of the signal intensity of each infrared transmitting tube in an infrared touch frame in the prior art is poor.

According to an exemplary embodiment of the present application, as shown in fig. 3, the infrared touch screen includes a plurality of light emitting devices 105 connected in parallel, a first end of each light emitting device 105 is configured to be electrically connected to a positive power supply 102, the infrared touch screen further includes a plurality of current adjusting circuits 104, a first end of each current adjusting circuit 104 is electrically connected to a second end of each light emitting device 105 in a one-to-one correspondence manner, a second end of each current adjusting circuit 104 is configured to be electrically connected to a negative power supply 103, and each current adjusting circuit 104 is configured to adjust an operating current of the corresponding light emitting device 105.

The infrared touch screen comprises a plurality of light-emitting devices connected in parallel, wherein the first end of each light-emitting device is respectively used for being electrically connected with the positive electrode of a power supply, the infrared touch screen further comprises a plurality of current regulating circuits, the first ends of the current regulating circuits are electrically connected with the second ends of the light-emitting devices in a one-to-one correspondence manner, the second ends of the current regulating circuits are used for being electrically connected with the negative electrode of the power supply, and the current regulating circuits are used for regulating the working currents of the corresponding light-emitting devices. Compared with the infrared touch frame in the prior art, all infrared emission tubes are adjusted through a current adjusting circuit, and the problem that the consistency of the signal intensity of each infrared emission tube is poor is caused. Meanwhile, compared with the prior art, in order to solve the problem that in the prior art, due to the fact that the length of the reflux line of the current is too long, signals of the light-emitting device are not enough, lost signals are often compensated in other aspects, and therefore other problems of related design circuits and cost are increased.

According to an embodiment of the present application, as shown in fig. 5, the infrared touch screen further includes a plurality of first switching devices 106, a first end of each of the first switching devices 106 is configured to be electrically connected to the positive power electrode 102, and a second end of each of the first switching devices 106 is electrically connected to a first end of the corresponding light emitting device 105 in a one-to-one correspondence manner. By controlling the switches of the first switch devices, the on/off of the light-emitting devices on the corresponding lines can be controlled, so that the working state of the light-emitting devices of the infrared touch screen can be flexibly controlled.

According to another embodiment of the present application, the first switching device includes a first transistor, a base of the first transistor is configured to receive a pulse signal, one of a collector or an emitter of the first transistor is configured to be electrically connected to the positive electrode of the power supply, and the other of the collector or the emitter of the first transistor is electrically connected to the first terminal of the corresponding light emitting device. And outputting a high level signal or a low level signal to the first triode through the pulse signal, thereby further ensuring that the corresponding light-emitting device is flexibly controlled to be switched on and off.

In practical applications, the first switching device is not limited to the first transistor, and may be any other switching device. In another specific embodiment, the first switching device includes a Metal Oxide Semiconductor (MOS) transistor, a gate of the MOS transistor is configured to receive the pulse signal, one of a source and a drain of the MOS transistor is configured to be electrically connected to the positive power supply, and the other of the source and the drain of the MOS transistor is electrically connected to the first end of the corresponding light emitting device.

In a more specific embodiment, as shown in fig. 5, the first switching device 106 is a MOS transistor and a PMOS transistor, a gate of the PMOS transistor is used for receiving the pulse signal V1, a source of the PMOS transistor is used for being electrically connected to the positive power supply 102, and a drain of the PMOS transistor is electrically connected to the first end of the corresponding light emitting device 105.

In order to further achieve flexible control of the operating state of the light emitting devices of the infrared touch screen, according to another embodiment of the present application, as shown in fig. 5, the infrared touch screen further includes a plurality of second switching devices 107, first ends of the second switching devices 107 are electrically connected to second ends of the light emitting devices 105 in a one-to-one correspondence, and second ends of the second switching devices 107 are electrically connected to first ends of the current adjusting circuits 104 in a one-to-one correspondence. By controlling the switches of the second switching devices, the light-emitting devices on the corresponding lines can be controlled to be turned on or off, so that the corresponding light-emitting devices can be flexibly controlled to be turned on or off.

According to an embodiment of the present application, the second switching device includes a second transistor, a base of the second transistor is configured to receive a pulse signal, one of a collector or an emitter of the second transistor is electrically connected to the second end of the corresponding light emitting device, and the other of the collector or the emitter of the second transistor is electrically connected to the first end of the corresponding current regulating circuit. And a high level signal or a low level signal is output to the second triode through the pulse signal, so that the conduction and the closing of the corresponding light-emitting device are further flexibly controlled.

Specifically, as shown in fig. 5 and 6, the infrared touch screen further includes a resistor R1 and a resistor R2, a first end of the R1 is connected to the first switching device 106, a first end of the R2 is connected to the second switching device 107, the first switching device 106 receives the pulse signal through the R1, and the second switching device 107 receives the pulse signal through the R2. The infrared touch screen further includes a resistor R3, a first end of the resistor R3 is grounded, and a second end of the resistor R3 is connected to the current adjusting circuit 104.

In practical applications, a person skilled in the art may select any feasible switching device or switching device as the second switching device, where the second switching device is not limited to the second transistor, and may also be any feasible other switching device, such as a transistor, for example, a MOS transistor, and of course, it may also be any other switching transistor or any other feasible switching device.

In another specific embodiment, as shown in fig. 5, the second switching device 107 is a transistor and is an NPN transistor, a base of the NPN transistor is configured to receive the pulse signal V2, a collector of the NPN transistor is electrically connected to the second end of the corresponding light emitting device 105, and an emitter of the NPN transistor is electrically connected to the first end of the corresponding current adjusting circuit 104.

In practical applications, a person skilled in the art may select to set the first switching device or the second switching device, and may select to set the first switching device and the second switching device simultaneously in order to further ensure accurate control over the light emitting device. In a specific embodiment, as shown in fig. 5, the infrared touch panel includes the first switching device and the second switching device, pulse signals V1 and V2 are both switching control signals of the light emitting device 105, when the pulse signals V1 and V2 (high level or low level) turn on the first switching device 106 and the second switching device 107, the power supply positive electrode 102 starts to supply power to the light emitting device 105, so as to form a current loop from the power supply positive electrode 102, the first switching device 106, the light emitting device 105, the second switching device 107, the current adjusting circuit 104 to the power supply negative electrode 103, and at this time, the current of the current adjusting circuit 104 corresponding to the light emitting device 105 can be controlled by circuit signals on the circuit board, so as to control the current flowing through the light emitting device 105, thereby controlling the intensity of the infrared light signal.

Specifically, if the loop through which the switching current flows is long, the length of the current loop may be equivalent to a resistance manner, as shown in fig. 6, a portion of the switching current effective for the light emitting device 105 is lost on the circuit of the circuit board, and Q = Pt = I R t (where Q represents heat, P represents power, and t represents time, I represents current, and R represents resistance, and x represents a product), the lost switching current may be totally emitted as heat, the infrared light signal may be relatively weakened, and the longer the circuit is, the more the lost switching current effective for the light emitting device may be, thereby easily causing a large error between the current and the signal of the light emitting device 105 at the head and the signal or between the theoretical signal intensity and the actual current and the signal, which affects the application prospect and requirements of the infrared touch frame technology, and therefore, the current adjusting circuit 104 may be added on each of the circuit board to effectively reduce the circuit length of the current, thereby reducing the loss of the effective light emitting device 105, increasing the light intensity of the light emitting device 105, and improving the light intensity control stability of the infrared light intensity, and ensuring the light intensity control error.

According to another specific embodiment of the present application, as shown in fig. 4, the infrared touch screen further includes a plurality of circuit boards, the circuit boards include a positive interface 108 and a negative interface 109, the light emitting devices 105 and the current adjusting circuits 104 are respectively located on the circuit boards in a one-to-one correspondence, a first end of the light emitting device 105 is configured to be electrically connected to the positive power supply 102 through the positive interface 108, and a second end of the current adjusting circuit 104 is configured to be electrically connected to the negative power supply 103 through the negative interface 109.

In a specific embodiment, the current regulating circuit is additionally arranged in the infrared touch screen, so that the length of a reflux line of a switching current is reduced, the working temperature of the circuit board is ensured to be lower, the working temperature environment of the infrared touch screen is ensured to be lower by reducing the thermal noise interference and temperature rise influence generated by the circuit board, and the stability and reliability of the infrared touch screen are ensured to be higher.

According to another specific embodiment of the present application, as shown in fig. 4, the infrared touch screen further includes a power supply, and the power supply includes the power supply positive electrode 102 and the power supply negative electrode 103. Of course, in consideration of miniaturization of the infrared touch screen, the power supply may also be an external power supply, and is not necessarily integrated in the infrared touch screen. The power supply may be a power supply having a charge/discharge function.

In a specific embodiment, the power source can be selected and set according to a power supply range required by the specification of the light emitting device, including 3.3V and 5V.

According to a specific embodiment of the present application, the current regulating circuit is a constant current driving circuit, a constant voltage driving circuit or a voltage current control circuit, wherein the voltage current control circuit is a circuit built by discrete devices such as a triode.

Specifically, the current regulating circuit may be implemented by discrete devices or current and voltage regulating chips specially used in the market, and the current regulating circuit includes an LED (Light Emitting Diode) constant current driving chip, an LED constant voltage driving chip, and the like. Because the existing current regulating circuit is mature in application, a person skilled in the art can flexibly select the current regulating circuit, so that the infrared touch screen is small in development difficulty and easy to realize.

According to another specific embodiment of the present application, the light emitting device includes an infrared light emitting diode. Preferably, the light emitting device is an infrared light emitting diode.

According to another exemplary embodiment of the present application, an electronic device is provided, which includes the infrared touch screen.

The electronic equipment comprises the infrared touch screen, and compared with the infrared touch frame in the prior art, all infrared emission tubes are adjusted through one current adjusting circuit, so that the problem of poor consistency of the signal intensity of each infrared emission tube is caused. Meanwhile, compared with the prior art, in order to solve the problem that in the prior art, due to the fact that the length of the reflux line of the current is too long, the signal of the light-emitting device is insufficient, the lost signal is often compensated in other aspects, and therefore other problems of related design circuits and cost are increased.

In the above embodiments of the present invention, the descriptions of the embodiments have their respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:

1) The infrared touch screen comprises a plurality of light emitting devices connected in parallel, wherein the first end of each light emitting device is respectively used for being electrically connected with the positive electrode of a power supply, the infrared touch screen further comprises a plurality of current adjusting circuits, the first ends of the current adjusting circuits are electrically connected with the second ends of the light emitting devices in a one-to-one correspondence mode, the second ends of the current adjusting circuits are used for being electrically connected with the negative electrode of the power supply, and the current adjusting circuits are used for adjusting the working currents of the corresponding light emitting devices. Compared with the infrared touch frame in the prior art, all infrared emission tubes are adjusted through a current adjusting circuit, and the problem that the consistency of the signal intensity of each infrared emission tube is poor is caused. Meanwhile, compared with the prior art, in order to solve the problem that in the prior art, due to the fact that the length of the reflux line of the current is too long, signals of the light-emitting device are not enough, lost signals are often compensated in other aspects, and therefore other problems of related design circuits and cost are increased.

2) The electronic equipment comprises the infrared touch screen, and compared with the infrared touch frame in the prior art, all infrared emission tubes are adjusted through a current adjusting circuit, so that the problem of poor consistency of the signal intensity of each infrared emission tube is caused. Meanwhile, compared with the prior art, in order to solve the problem that in the prior art, due to the fact that the length of the reflux line of the current is too long, signals of the light-emitting device are insufficient, lost signals are often made up in other aspects, and therefore other problems of related design circuits and cost are increased.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The utility model provides an infrared touch-sensitive screen, infrared touch-sensitive screen includes a plurality of parallelly connected light emitting device, each the first end of light emitting device is used for being connected with the anodal electricity of power, its characterized in that, infrared touch-sensitive screen still includes:

the first ends of the current regulating circuits are electrically connected with the second ends of the light-emitting devices in a one-to-one correspondence mode, the second ends of the current regulating circuits are electrically connected with a power supply cathode, and the current regulating circuits are used for regulating the working currents of the light-emitting devices correspondingly.

2. The infrared touch screen of claim 1, further comprising:

and the first ends of the first switch devices are electrically connected with the positive electrode of the power supply, and the second ends of the first switch devices are electrically connected with the first ends of the light-emitting devices in a one-to-one correspondence manner.

3. The infrared touch screen of claim 2, wherein the first switching device comprises a first triode, a base of the first triode is used for receiving a pulse signal, one of a collector or an emitter of the first triode is used for being electrically connected with the positive electrode of the power supply, and the other of the collector or the emitter of the first triode is electrically connected with the first end of the corresponding light-emitting device.

4. The infrared touch screen of claim 1, further comprising:

and the first ends of the second switching devices are electrically connected with the second ends of the light-emitting devices in a one-to-one correspondence manner, and the second ends of the second switching devices are electrically connected with the first ends of the current regulating circuits in a one-to-one correspondence manner.

5. The infrared touch screen of claim 4, wherein the second switching device comprises a second transistor, a base of the second transistor is configured to receive a pulse signal, one of a collector or an emitter of the second transistor is electrically connected to the second end of the corresponding light emitting device, and the other of the collector or the emitter of the second transistor is electrically connected to the first end of the corresponding current regulating circuit.

6. The infrared touch screen of claim 1, further comprising:

the circuit board comprises a positive interface and a negative interface, the light-emitting device and the current regulating circuit are respectively located on the circuit board in a one-to-one correspondence mode, the first end of the light-emitting device is used for being connected with the positive electrode of the power supply through the positive interface, and the second end of the current regulating circuit is used for being connected with the negative electrode of the power supply through the negative interface.

7. The infrared touch screen of any one of claims 1 to 6, further comprising:

and the power supply comprises the power supply anode and the power supply cathode.

8. The infrared touch screen of any one of claims 1 to 6, wherein the current regulating circuit is a constant current driving circuit, a constant voltage driving circuit or a voltage current control circuit, wherein the voltage current control circuit is a circuit built by using discrete devices.

9. The infrared touch screen of any one of claims 1 to 6, wherein the light emitting devices comprise infrared light emitting diodes.

10. An electronic device, comprising:

the infrared touch screen of any one of claims 1 to 9.

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