CN106598352B - Infrared touch device and voltage signal generation method - Google Patents
Infrared touch device and voltage signal generation method Download PDFInfo
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- CN106598352B CN106598352B CN201610928277.XA CN201610928277A CN106598352B CN 106598352 B CN106598352 B CN 106598352B CN 201610928277 A CN201610928277 A CN 201610928277A CN 106598352 B CN106598352 B CN 106598352B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
Abstract
The application discloses infrared touch equipment, its infrared touch screen's receiving module includes resistance circuit and photosensitive diode circuit, wherein: the resistance circuit is provided with a plurality of sampling resistors respectively corresponding to a preset light intensity range and used for selecting the sampling resistor corresponding to the light intensity range where the ambient light intensity is located according to the current ambient light intensity of the infrared touch device so as to convert the photocurrent signal into a voltage signal; the photosensitive diode circuit is connected with the resistance circuit and is grounded through the resistance circuit, and the photosensitive diode circuit is used for generating a photocurrent signal according to the ambient light intensity. By applying the scheme, on the basis of meeting the light resistance, the appropriate sampling resistor can be selected according to the actual light intensity range, so that the driving current and the power consumption of the emitting geminate transistors of the infrared touch equipment are reduced, and the service life of the infrared touch equipment is prolonged. Meanwhile, the application also provides a voltage signal generation method and a voltage signal generation device.
Description
Technical Field
The invention relates to the technical field of communication, in particular to infrared touch equipment. The invention also relates to a voltage signal generation method.
Background
Touch screens are electronic systems that can detect the presence and location of a touch within a display area, which simplifies human-computer interaction methods. In the current touch technology, the infrared touch technology has the advantages of strong environmental adaptability, longer service life, more recognizable touch points and the like.
An infrared technology touch screen (infrared touch screen technology) is composed of infrared emitting and receiving sensing elements mounted on the outer frame of the touch screen, and an infrared detection net is formed on the screen surface, and any touch object can change the infrared on the touch points to realize the touch screen operation. The infrared touch screen is implemented on the principle similar to the surface acoustic wave touch screen, and uses infrared emitting and receiving sensing elements. The elements form an infrared detection network on the surface of the screen, and an object (such as a finger) for touch operation can change the infrared ray of an electric shock and further be converted into a coordinate position for touch operation so as to realize the response of the operation. On the infrared touch screen, the circuit board devices arranged on four sides of the screen are provided with infrared transmitting tubes and infrared receiving tubes, and the infrared transmitting tubes and the infrared receiving tubes correspondingly form a transverse and vertical crossed infrared matrix.
The infrared touch screen is not only simple in structure, but also free from interference of current, voltage, static electricity and the like, so that the infrared touch screen is suitable for being used in a plurality of severe environments, has the advantages of high stability, high resolution, convenience in installation and the like, and is becoming a mainstream product in the touch screen market more and more at present.
Fig. 1 is a schematic diagram of a received signal processing circuit of an infrared touch screen in the prior art. According to the scheme, a bias voltage is applied to a photosensitive diode (receiving tube), and a sampling resistor R is grounded to convert a photocurrent signal into a voltage signal. Assuming that the generated photocurrent is I (ψ), which is the light intensity received by the photodiode, the amplitude of the generated signal is: v (ψ) = R · I (ψ), in other words, the larger the sampling resistance R is, the larger the signal amplitude V (ψ) is generated under the condition that the light intensity is the same. The light intensity difference generated by the infrared transmitting tube switch is delta (psi), the generated signal difference is: Δ V (ψ) = Δ (ψ) · R, where Δ V (ψ) = is an effective signal.
However, when the infrared touch screen is in operation, if the environment contains a large amount of infrared components, especially in direct sunlight, the infrared touch screen cannot be used due to interference of infrared rays. Therefore, when the infrared touch screen is designed, the light resistance performance must be considered, and the touch screen is ensured not to be influenced by external interference light.
At present, the light resisting method is various, except for the aspects of software algorithm and structure, the following methods are mainly used on the circuit:
1. using an RC filter circuit: the frequency of interference light in a general environment is lower than that of an infrared touch screen signal, an effective signal can be considered as a high-frequency signal, an interference signal is considered as a low-frequency signal, and the filter circuit filters the low-frequency interference signal;
2. by utilizing the characteristic that the voltage on two sides of the capacitor can not change suddenly, the capacitor is connected with a signal after photoelectric conversion, one end of the capacitor is connected with the bleeder switch, and the voltage generated by the ambient light is stored on the capacitor. When the effective signal arrives, the bleeder switch is closed, and the signal output by the capacitor is the effective signal with higher signal-to-noise ratio.
3. The transmitting end uses a carrier modulation mode, and the receiving end carries out filtering and demodulation processing.
The inventor finds that the above scheme can filter the interference light signal within a certain range of ambient light intensity to achieve the effect of light resistance, but all have a premise that the signal at the most original sampling resistor (position 1) cannot be saturated, i.e. the voltage V (ψ) at position 1 is less than VCC. To achieve this goal, the value of the sampling resistor R needs to be reduced to avoid signal saturation in strong ambient light. However, after the sampling resistance is determined, the maximum light resistance is determined. Meanwhile, because the effective signal generated by the small sampling resistor is weaker, the power of the emission lamp needs to be increased, namely, the driving current is increased, the power consumption of the system is increased, and the service life of the product is easily shortened due to large current impact. In actual use, the use scenes with strong ambient light are few, and a sampling resistor which is too small is not needed.
Therefore, how to select a proper sampling resistor according to actual needs on the basis of meeting the light resistance, so as to reduce the power consumption of the infrared touch device and improve the service life of the infrared touch device becomes a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention provides an infrared touch device, which is used for selecting a proper sampling resistor according to actual needs on the basis of meeting the light resistance, further reducing the power consumption of the infrared touch device and prolonging the service life of the infrared touch device, wherein an infrared touch screen of the infrared touch device comprises a resistor circuit and a photosensitive diode circuit, wherein:
the resistance circuit is provided with a plurality of sampling resistors respectively corresponding to a preset light intensity range, and is used for selecting the sampling resistor corresponding to the light intensity range where the ambient light intensity is located according to the current ambient light intensity of the infrared touch device to convert the photocurrent signal into a voltage signal;
the photosensitive diode circuit is connected with the resistance circuit, is grounded through the resistance circuit and is used for generating the photocurrent signal according to the ambient light intensity.
Preferably, the resistance circuit includes a plurality of sampling resistors and a multiplexing switch, wherein:
the multi-path selection switch is connected with the photosensitive diode circuit, and each sampling resistor is connected with the multi-path selection switch and grounded.
Preferably, the infrared touch device further includes a control interface, the photodiode circuit includes a switch control circuit and a photodiode, wherein:
the control interface is connected with the switch control circuit and is used for sending a high-level signal to the switch control circuit when the photocurrent signal needs to be sent to the resistance circuit, and sending a low-level signal to the switch control circuit when the photocurrent signal does not need to be sent to the resistance circuit;
the switch control circuit is used for being switched on when receiving the high level signal, sending the photocurrent signal to the resistance circuit, and being switched off when receiving the low level signal, and blocking the photocurrent signal.
Preferably, the switch control circuit is composed of a control resistor and a triode, wherein:
the base electrode of the triode is respectively connected with the control resistor and the positive electrode of the photosensitive diode, the collector electrode of the triode is connected with the power output interface, and the emitter electrode of the triode is connected with the resistor circuit;
the control resistor and the cathode of the photosensitive diode are respectively connected with the control interface.
Preferably, when the infrared touch device includes a plurality of the resistor circuits and a plurality of the photodiode circuits, the resistor circuits are connected in parallel with each other and are respectively connected to different photodiode circuits;
wherein the number of the photodiode circuits is not less than the number of the resistance circuits.
Correspondingly, the present application provides a method for generating a voltage signal, which is applied to the above-mentioned infrared touch device, where the infrared touch device presets a corresponding relationship between different light range intensities and each of the sampling resistors, and the method further includes:
the infrared touch equipment determines the light intensity range of the current ambient light intensity;
the infrared touch equipment controls the resistance circuit to select a sampling resistance corresponding to the light intensity range according to the corresponding relation;
and the infrared touch equipment converts the photocurrent signal generated by the photosensitive diode circuit into a voltage signal through the sampling resistor.
Preferably, the infrared touch device determines a light intensity range in which the current ambient light intensity is located, specifically:
detecting the voltage of the sampling resistor;
and determining the light intensity range according to the amplitude of the voltage.
Preferably, when the photocurrent signal needs to be sent to the resistance circuit, the infrared touch device sends a high-level signal to the switch control circuit through the control interface, so that the switch control circuit is turned on, and sends the photocurrent signal to the resistance circuit;
when the photocurrent signal is not required to be sent to the resistance circuit, the infrared touch device sends a low-level signal to the switch control circuit through the control interface, so that the switch control circuit is turned off, and the photocurrent signal is blocked.
Correspondingly, this application proposes a voltage signal generation device, set up in infrared touch device as above, its characterized in that includes:
the storage module is used for storing the corresponding relation between different light intensity ranges and the sampling resistors;
the acquisition module is used for determining the light intensity range of the current ambient light intensity;
the control module controls the resistance circuit to select the sampling resistance corresponding to the light intensity range according to the corresponding relation;
and the generation module converts the photocurrent signal generated by the photodiode circuit into a voltage signal through the sampling resistor.
Preferably, the acquiring module specifically includes:
the detection submodule detects the voltage of the sampling resistor;
and the determining submodule determines the light intensity range according to the amplitude of the voltage.
Preferably, the method further comprises the following steps:
the sending module is used for sending a high-level signal to the switch control circuit through the control interface when the photocurrent signal needs to be sent to the resistance circuit, so that the switch control circuit is conducted, and the photocurrent signal is sent to the resistance circuit;
and the blocking module is used for sending a low level signal to the switch control circuit through the control interface when the photocurrent signal is not required to be sent to the resistance circuit, so that the switch control circuit is cut off and the photocurrent signal is blocked.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the beneficial technical effects that at least:
the application provides an infrared touch device, its infrared touch screen's receiving module includes resistance circuit and photosensitive diode circuit, wherein: the resistance circuit is provided with a plurality of sampling resistors respectively corresponding to a preset light intensity range and used for selecting the sampling resistor corresponding to the light intensity range where the ambient light intensity is located according to the current ambient light intensity of the infrared touch device so as to convert the photocurrent signal into a voltage signal; the photosensitive diode circuit is connected with the resistance circuit and is grounded through the resistance circuit, and the photosensitive diode circuit is used for generating a photocurrent signal according to the ambient light intensity. By applying the scheme, on the basis of meeting the light resistance, the appropriate sampling resistor can be selected according to the actual light intensity range, so that the driving current and the power consumption of the emitting geminate transistors of the infrared touch equipment are reduced, and the service life of the infrared touch equipment is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a received signal processing circuit of a prior art mid-IR touch screen;
fig. 2 is a schematic structural diagram of an infrared touch device according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a voltage signal generating method according to a second embodiment of the present disclosure;
FIG. 4 is a circuit diagram of a multi-sampling resistor according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a packet circuit according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a pair of pipe packets according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a sampling resistor according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a voltage signal generating apparatus according to the present application.
Detailed Description
As described in the background, in the design of the existing infrared touch screen, the sampling resistance is fixed. In order to meet the requirement of the environment with strong ambient light, a sampling resistor with a small resistance value is required to be arranged. In practical applications, however, there are not many usage scenarios with strong ambient light, and in a normal usage scenario, it is necessary to use a small-resistance application resistor. Because the effective signal generated by the sampling resistor with small resistance value is weaker, the power of the emitting lamp needs to be increased, namely, the driving current is increased, and the power consumption of the system is increased. Meanwhile, the service life of the product is easily reduced by large current impact.
Therefore, the present application provides an infrared touch device, an infrared touch screen thereof includes a resistance circuit and a photodiode circuit, wherein: the resistance circuit is provided with a plurality of sampling resistors respectively corresponding to a preset light intensity range and used for selecting the sampling resistor corresponding to the light intensity range where the ambient light intensity is located according to the current ambient light intensity of the infrared touch device so as to convert the photocurrent signal into a voltage signal; the photosensitive diode circuit is connected with the resistance circuit and is grounded through the resistance circuit, and the photosensitive diode circuit is used for generating a photocurrent signal according to the ambient light intensity. Through the infrared touch equipment provided by the application, the voltage signal can be generated by automatically selecting the appropriate sampling resistor according to the intensity of the current ambient light, so that the driving current and the power consumption of the emission geminate transistors of the infrared touch equipment are reduced, and the service life of the infrared touch equipment is prolonged.
Example one
Based on the above discussion, as shown in fig. 2, a schematic structural diagram of an infrared touch screen device provided in the present application includes a resistor circuit 201 and a photodiode circuit 202, and the following important characteristic components are introduced:
(1) Resistance circuit
In an embodiment of the application, it is intended to select a suitable sampling resistance for the resistance circuit to generate the voltage signal according to different ambient light intensities. Therefore, first, a plurality of sampling resistors each corresponding to a predetermined light intensity range are provided in the resistor circuit. Different applied resistances correspond to different ambient light intensities, respectively.
Therefore, the infrared touch screen equipment can select the sampling resistor corresponding to the current ambient light intensity for the resistor circuit according to the real-time ambient light intensity. Therefore, the problems of high power consumption and low service life of equipment caused by the fact that a small-resistance sampling resistor is still used under normal ambient light intensity in the prior art are solved.
Because different sampling resistors need to be selected according to different ambient light intensities, switching of different sampling resistors needs to be realized in the resistor circuit.
In the preferred embodiment of the present application, the switching between different sampling resistors is realized by providing a multi-way selection switch in the resistor circuit.
The resistance circuit comprises a multi-way selection switch and a plurality of sampling resistors. The multi-way selection switch is connected with the photosensitive diode circuit. And each sampling resistor is respectively connected with the multi-path selection switch and is respectively grounded.
The multi-path selection switch can realize the switching between different sampling resistors. When the ambient light intensity changes, the resistance circuit selects the sampling resistance corresponding to the current ambient light intensity through the multi-way selection switch to generate a voltage signal.
It should be noted that the above-mentioned scheme for implementing switching of different sampling resistors is only a preferred embodiment provided in the present application, and based on the core idea of the present application, a person skilled in the art may also adopt other methods for switching of sampling resistors, which does not affect the protection scope of the present application.
(2) Photosensitive diode circuit
In an embodiment of the present application, the photodiode circuit is connected to the resistor circuit and is grounded through the resistor circuit. The photosensitive diode circuit is used for generating the photocurrent signal according to the ambient light intensity.
The photosensitive diode circuit is a component for generating photocurrent signals in the infrared touch screen, and can generate photocurrent signals with different sizes according to the current intensity of ambient light. When the intensity of the ambient light is small, the photocurrent generated by the photodiode circuit is small, and a large sampling resistor needs to be equipped to make the amplitude of the generated voltage signal large. When the ambient light intensity is larger, the photocurrent generated by the photodiode circuit is larger, and a smaller sampling resistor needs to be equipped to enable the generated voltage signal to be unsaturated.
With the increase of the size of the infrared touch screen, more and more photosensitive diode circuits are arranged inside the infrared touch screen. In practical application scenarios, not all photodiode circuits need to be operated. Therefore, a switch is also required to be arranged in the photosensitive diode circuit to control whether the photosensitive diode circuit is connected with the sampling resistor or not.
In an embodiment of the present application, a photodiode circuit includes a switch control circuit and a photodiode. The infrared touch screen device further comprises a control interface.
The control interface is connected with the switch control circuit and used for sending a high-level signal to the switch control circuit when the photocurrent signal needs to be sent to the resistance circuit, and sending a low-level signal to the switch control circuit when the photocurrent signal does not need to be sent to the resistance circuit.
And the switch control circuit is used for conducting when receiving a high level signal sent by the control interface, sending a photocurrent signal generated by the photosensitive diode circuit to the resistance circuit, and stopping when receiving a low level signal sent by the control interface, and blocking the photocurrent signal generated by the photosensitive diode circuit.
In a preferred embodiment of the present application, the switch control circuit is composed of a control resistor and a transistor, and the connection mode of each component in the photodiode circuit is as follows:
the base electrode of the triode is respectively connected with the control resistor and the positive electrode of the photosensitive diode, the collector electrode of the triode is connected with the power output interface, and the emitter electrode of the triode is connected with the resistor circuit.
The control resistor and the cathode of the photosensitive diode are respectively connected with the control interface.
The operating principle of the switch control circuit is as follows: when a high level signal of the control switch is received, the triode is conducted, and at the moment, a photocurrent signal generated by the photosensitive diode is sent to the resistance circuit through the triode. When a low level signal of the control switch is received, the triode is cut off, and a photocurrent signal generated by the photosensitive diode is blocked by the triode.
It should be noted that, the composition and the connection manner of the switch control circuit are only a preferred embodiment proposed in the present application, and based on the core idea of the present application, a person skilled in the art may adopt other switch control circuit forms, which does not affect the protection scope of the present application.
Meanwhile, since not all the photodiode circuits need to be operated simultaneously, it is not necessary to separately configure a resistor circuit for each photodiode circuit. In a preferred embodiment of the present application, one resistor circuit corresponds to a plurality of photodiode off circuits.
Specifically, when the infrared touch device includes a plurality of resistor circuits and the photodiode circuits, the resistor circuits are connected in parallel with each other and connected to different photodiode circuits, respectively. And each of the resistor circuits is connected to at least one of the photodiode circuits, so that the number of the photodiode circuits is not less than the number of the resistor circuits.
Meanwhile, the photosensitive diode circuit controls whether to be connected into the resistor circuit or not through the switch control circuit.
Through the preferred scheme, when the infrared touch screen is large in size and the number of the photosensitive diodes is large, the processing requirements of photocurrent signals generated by all the photosensitive diode circuits can be met only by configuring a few resistance circuits. Therefore, the number of resistance circuits in the infrared touch screen is reduced, and the area occupation of a PCB (printed circuit board) is reduced.
As can be seen from the above description, the present application provides an infrared touch device, wherein a receiving module of an infrared touch screen of the infrared touch device includes a resistor circuit and a photodiode circuit, wherein: the resistance circuit is provided with a plurality of sampling resistors respectively corresponding to a preset light intensity range and used for selecting the sampling resistor corresponding to the light intensity range where the ambient light intensity is located according to the current ambient light intensity of the infrared touch device so as to convert the photocurrent signal into a voltage signal; the photosensitive diode circuit is connected with the resistance circuit and is grounded through the resistance circuit, and the photosensitive diode circuit is used for generating a photocurrent signal according to the ambient light intensity. By applying the scheme, on the basis of meeting the light resistance, the appropriate sampling resistor can be selected according to the actual light intensity range, so that the driving current and the power consumption of the emitting geminate transistors of the infrared touch equipment are reduced, and the service life of the infrared touch equipment is prolonged.
Example two
Based on the infrared touch screen device provided in the first embodiment, the present application provides a voltage signal generation method, which is applied to the infrared touch device provided in the first embodiment. The infrared touch equipment presets the corresponding relation between different light intensity ranges and the sampling resistors. First, the infrared touch device determines a light intensity range in which the current ambient light intensity is located. Secondly, the infrared touch equipment controls the resistance circuit to select a sampling resistance corresponding to the determined light intensity range according to the corresponding relation; and finally, converting the photocurrent signal generated by the photodiode circuit into a voltage signal by the infrared touch equipment through the determined sampling resistor. Therefore, a voltage signal is generated by automatically selecting a proper sampling resistor according to the intensity of the current ambient light, the driving current and the power consumption of the emission geminate transistor of the infrared touch equipment are reduced, and the service life of the infrared touch equipment is prolonged.
Specifically, as shown in fig. 3, a schematic flow chart of a voltage signal generating method provided in the present application is shown, and the method at least includes the following steps:
s301, the infrared touch device determines a light intensity range where the current ambient light intensity is located.
In the embodiments of the present application, it is intended to select an appropriate sampling resistance for the resistance circuit according to different ambient light intensities, so that it is first necessary to determine the light intensity range in which the current ambient light intensity is located. And then, determining the sampling resistance according to the corresponding relation between different preset light intensity ranges of the infrared touch equipment and the sampling resistances.
In a preferred embodiment of the present application, determining the light intensity range in which the current ambient light intensity is located may be achieved by a method comprising the steps of:
(1) And detecting the voltage of the sampling resistor.
The resistance circuit is connected with the sampling resistor by default, and the range of the ambient light intensity can be determined by detecting a voltage signal generated by the sampling resistor and adopting the size of the resistor.
(2) The light intensity range is determined according to the magnitude of the voltage.
And S302, the infrared touch equipment controls the resistance circuit to select the sampling resistance corresponding to the current light intensity range according to the corresponding relation between the different light intensity ranges and the sampling resistances.
In the embodiment of the application, after the current ambient light intensity is determined, the infrared touch device controls the resistance circuit to select the sampling resistor corresponding to the current light intensity range according to the corresponding relationship between the different light intensity ranges and the sampling resistors. Therefore, the sampling resistor corresponding to the ambient light intensity is automatically selected according to the current ambient light intensity.
And S303, converting the photocurrent signal generated by the photosensitive diode circuit into a voltage signal by the infrared touch equipment through the sampling resistor.
In the embodiment of the application, after the sampling resistor corresponding to the current ambient light intensity is determined, the infrared touch device converts the photocurrent signal generated by the photodiode circuit into a voltage signal through the sampling resistor. Therefore, the generated voltage signal has a better amplitude on the premise of not increasing the driving current. Therefore, the defects of high power consumption and short service life caused by the need of increasing the driving current in the prior art are overcome.
With the increase of the size of the infrared touch screen, more and more photosensitive diode circuits are arranged inside the infrared touch screen. In practical application scenarios, not all photodiode circuits need to be operated.
In a preferred embodiment of the present application, whether or not to switch the photodiode circuit into the resistor circuit is achieved by the following method. The method comprises the following steps:
(1) When the photocurrent signal needs to be sent to the resistance circuit, the infrared touch device sends a high-level signal to the switch control circuit through the control interface so as to enable the switch control circuit to be conducted, and sends the photocurrent signal to the resistance circuit.
(2) When the photocurrent signal is not required to be sent to the resistance circuit, the infrared touch device sends a low-level signal to the switch control circuit through the control interface so as to cut off the switch control circuit and block the photocurrent signal.
As can be seen from the description of the above method flow, the present application provides an infrared touch device, where a receiving module of an infrared touch screen includes a resistor circuit and a photodiode circuit, where: the resistance circuit is provided with a plurality of sampling resistors respectively corresponding to a preset light intensity range and used for selecting the sampling resistor corresponding to the light intensity range where the ambient light intensity is located according to the current ambient light intensity of the infrared touch device so as to convert the photocurrent signal into a voltage signal; the photosensitive diode circuit is connected with the resistance circuit and is grounded through the resistance circuit, and the photosensitive diode circuit is used for generating a photocurrent signal according to the ambient light intensity. By applying the scheme, on the basis of meeting the light resistance, the appropriate sampling resistor can be selected according to the actual light intensity range, so that the driving current and the power consumption of the emitting geminate transistors of the infrared touch equipment are reduced, and the service life of the infrared touch equipment is prolonged.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
Fig. 4 is a circuit diagram of a multi-sampling resistor circuit according to an embodiment of the present invention, in which a photo-resistor is connected to a multi-way selection switch and grounded through a plurality of parallel sampling resistors.
Based on the above connection mode, the implementation mode of the application is that the ambient light intensity is divided into N intervals, each interval is provided with an optimal sampling resistance value, and a proper sampling resistance is selected through a multi-way switch (2 ways or more). The stronger the ambient light is, the smaller the sampling resistance value is, so as to avoid signal saturation; the weaker the ambient light, the larger the sampling resistance value to reduce the emitted lamp drive current required to obtain a valid signal. The specific process can be implemented by the following steps.
(1) The MCU (detection chip) detects the voltage of the sampling resistor and calculates the range of the environmental light intensity according to the voltage amplitude;
(2) And controlling the multi-way switch to select the corresponding sampling resistor according to the calculated range.
Since the resistance value of each light intensity interval is the optimal sampling resistance value for the ambient light intensity, a larger effective signal can be obtained with smaller infrared light intensity (smaller emission lamp driving current). The system automatically adjusts according to different ambient light to realize optimal circuit parameters.
In addition, when the infrared touch frame is large in size and the number of photodiodes (receiving lamps) is large, if each receiving lamp is designed as described above, a great difficulty is caused in actual operation. For example, there are too many components, the PCB area occupies a large area, and so on. To solve this problem, an optimization scheme is proposed in the specific embodiment of the present application: all the photodiodes are grouped into N groups, and each photodiode is controlled by a switch to connect or disconnect a sampling resistor. As shown in fig. 5. Therefore, the number of groups of the total sampling resistors can be reduced to N groups, and signal processing is centralized on one PCB, so that subsequent processing is facilitated.
For example, the following steps are carried out: as shown in fig. 6, if all the photodiodes are divided into 8 groups, only 8 groups of sampling resistors are provided, and two sampling resistors are provided for each group, corresponding to weak ambient light and strong ambient light, respectively. As shown in fig. 7, the control switch of each photodiode may be implemented by a transistor and a resistor.
As can be seen from the above description of the specific embodiments, the present application provides an infrared touch device, where a receiving module of an infrared touch screen includes a resistor circuit and a photodiode circuit, where: the resistance circuit is provided with a plurality of sampling resistors respectively corresponding to a preset light intensity range and used for selecting the sampling resistor corresponding to the light intensity range where the ambient light intensity is located according to the current ambient light intensity of the infrared touch device so as to convert the photocurrent signal into a voltage signal; the photosensitive diode circuit is connected with the resistance circuit and is grounded through the resistance circuit, and the photosensitive diode circuit is used for generating a photocurrent signal according to the ambient light intensity. Through applying the scheme, the appropriate sampling resistor can be selected according to the actual light intensity range on the basis of meeting the light resistance, so that the driving current and the power consumption of the emission geminate transistors of the infrared touch equipment are reduced, and the service life of the infrared touch equipment is prolonged.
In order to achieve the above technical objective, the present application provides a voltage signal generating apparatus, which is disposed in an infrared touch device according to the first embodiment, as shown in the figure, the apparatus includes:
a storage module 801 for storing the corresponding relationship between different light intensity ranges and the sampling resistors;
an obtaining module 802, which determines a light intensity range in which the current ambient light intensity is located;
a control module 803, which controls the resistance circuit to select the sampling resistance corresponding to the light intensity range according to the corresponding relationship;
the generating module 804 converts the photocurrent signal generated by the photodiode circuit into a voltage signal through the sampling resistor.
In a specific application scenario, the obtaining module specifically includes:
the detection submodule detects the voltage of the sampling resistor;
and the determining submodule determines the light intensity range according to the amplitude of the voltage.
In a specific application scenario, the method further includes:
the sending module sends a high-level signal to the switch control circuit through the control interface when the photocurrent signal needs to be sent to the resistance circuit, so that the switch control circuit is conducted, and sends the photocurrent signal to the resistance circuit;
and the blocking module is used for sending a low-level signal to the switch control circuit through the control interface when the photocurrent signal is not required to be sent to the resistance circuit, so that the switch control circuit is stopped, and the photocurrent signal is blocked.
As can be seen from the description of the specific apparatuses above, the present application provides an infrared touch device, wherein a receiving module of an infrared touch screen of the infrared touch device includes a resistor circuit and a photodiode circuit, wherein: the resistance circuit is provided with a plurality of sampling resistors corresponding to a preset light intensity range respectively, and is used for selecting the sampling resistor corresponding to the light intensity range where the ambient light intensity is located according to the current ambient light intensity of the infrared touch device to convert the photocurrent signal into a voltage signal; the photosensitive diode circuit is connected with the resistance circuit and is grounded through the resistance circuit, and the photosensitive diode circuit is used for generating a photocurrent signal according to the ambient light intensity. Through applying the scheme, the appropriate sampling resistor can be selected according to the actual light intensity range on the basis of meeting the light resistance, so that the driving current and the power consumption of the emission geminate transistors of the infrared touch equipment are reduced, and the service life of the infrared touch equipment is prolonged.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method according to the implementation scenarios of the present invention.
Those skilled in the art will appreciate that the figures are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The above-mentioned serial numbers of the present invention are merely for description, and do not represent the merits of the implementation scenario.
The above disclosure is only a few specific implementation scenarios of the present invention, however, the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (10)
1. An infrared touch device, wherein an infrared touch screen of the infrared touch device comprises a resistance circuit and a photodiode circuit, wherein:
the resistance circuit is provided with a plurality of sampling resistors which respectively correspond to a preset light intensity range, the resistance circuit comprises a multi-path selection switch and a plurality of sampling resistors, the multi-path selection switch is connected with the photodiode circuit, and each sampling resistor is respectively connected with the multi-path selection switch and grounded and is used for selecting the sampling resistor corresponding to the light intensity range of the environment light intensity according to the current environment light intensity of the infrared touch equipment so as to convert a photocurrent signal into a voltage signal;
the photosensitive diode circuit is connected with the resistance circuit, is grounded through the resistance circuit and is used for generating the photocurrent signal according to the ambient light intensity;
infrared touch equipment still includes control interface, the photosensitive diode circuit includes switch control circuit and photosensitive diode, wherein:
the control interface is connected with the switch control circuit and used for sending a high-level signal to the switch control circuit when the photocurrent signal needs to be sent to the resistance circuit, and sending a low-level signal to the switch control circuit when the photocurrent signal does not need to be sent to the resistance circuit.
2. The infrared touch device as recited in claim 1 wherein said switch control circuit is configured to turn on and send said photocurrent signal to said resistive circuit upon receiving said high level signal and turn off and block said photocurrent signal upon receiving said low level signal.
3. The infrared touch device as set forth in claim 2, wherein the switch control circuit is comprised of a control resistor and a transistor, wherein:
the base electrode of the triode is respectively connected with the control resistor and the positive electrode of the photosensitive diode, the collector electrode of the triode is connected with the power output interface, and the emitter electrode of the triode is connected with the resistor circuit;
the control resistor and the cathode of the photosensitive diode are respectively connected with the control interface.
4. The infrared touch device as set forth in claim 2, wherein when the infrared touch device includes a plurality of the resistor circuits and a plurality of the photodiode circuits, the resistor circuits are connected in parallel with each other and are connected to different ones of the photodiode circuits, respectively;
wherein the number of the photodiode circuits is not less than the number of the resistor circuits.
5. A method for generating a voltage signal, applied to the infrared touch device according to any one of claims 1 to 4, wherein the infrared touch device presets a corresponding relationship between different light intensity ranges and the sampling resistors, and the method further comprises:
the infrared touch equipment determines the light intensity range of the current ambient light intensity;
the infrared touch equipment controls the resistance circuit to select a sampling resistance corresponding to the light intensity range according to the corresponding relation;
and the infrared touch equipment converts the photocurrent signal generated by the photosensitive diode circuit into a voltage signal through the sampling resistor.
6. The method according to claim 5, wherein the infrared touch device determines a light intensity range in which the current ambient light intensity is located, specifically:
detecting the voltage of the sampling resistor;
and determining the light intensity range according to the amplitude of the voltage.
7. The method of claim 5, further comprising, when the photocurrent signal needs to be sent to the resistive circuit, the infrared touch device sending a high level signal to the switch control circuit through the control interface to turn on the switch control circuit and send the photocurrent signal to the resistive circuit;
when the photocurrent signal is not required to be sent to the resistance circuit, the infrared touch device sends a low-level signal to the switch control circuit through the control interface, so that the switch control circuit is turned off, and the photocurrent signal is blocked.
8. A voltage signal generation apparatus provided to the infrared touch device according to any one of claims 1 to 4, comprising:
the storage module is used for storing the corresponding relation between different light intensity ranges and the sampling resistors;
the acquisition module is used for determining the light intensity range of the current ambient light intensity;
the control module controls the resistance circuit to select the sampling resistance corresponding to the light intensity range according to the corresponding relation;
and the generation module converts the photocurrent signal generated by the photodiode circuit into a voltage signal through the sampling resistor.
9. The generation apparatus of claim 8, wherein the acquisition module specifically comprises:
the detection submodule detects the voltage of the sampling resistor;
and the determining submodule determines the light intensity range according to the amplitude of the voltage.
10. The generation apparatus of claim 8, further comprising:
the sending module sends a high-level signal to the switch control circuit through the control interface when the photocurrent signal needs to be sent to the resistance circuit, so that the switch control circuit is conducted, and sends the photocurrent signal to the resistance circuit;
and the blocking module is used for sending a low level signal to the switch control circuit through the control interface when the photocurrent signal is not required to be sent to the resistance circuit, so that the switch control circuit is cut off and the photocurrent signal is blocked.
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| CN108847896A (en) * | 2018-08-29 | 2018-11-20 | 深圳市天英联合教育股份有限公司 | infrared touch screen optical signal receiving circuit |
| CN109799929B (en) * | 2019-01-09 | 2022-02-25 | 中山佳时光电科技有限公司 | Anti-light touch electronic whiteboard |
| CN116719436A (en) * | 2022-06-30 | 2023-09-08 | 广州众远智慧科技有限公司 | Sampling control method, control device, processor and sampling system |
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