CN117931006A - Infrared touch frame circuit board card, infrared touch frame and infrared touch screen - Google Patents
Infrared touch frame circuit board card, infrared touch frame and infrared touch screen Download PDFInfo
- Publication number
- CN117931006A CN117931006A CN202410178646.2A CN202410178646A CN117931006A CN 117931006 A CN117931006 A CN 117931006A CN 202410178646 A CN202410178646 A CN 202410178646A CN 117931006 A CN117931006 A CN 117931006A
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- attenuation
- board
- slave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000003321 amplification Effects 0.000 claims abstract description 16
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 16
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 239000000284 extract Substances 0.000 claims abstract description 4
- 230000001360 synchronised effect Effects 0.000 claims description 34
- 230000003750 conditioning effect Effects 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 10
- 230000002238 attenuated effect Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
The application relates to an infrared touch frame circuit board card, an infrared touch frame and an infrared touch screen, wherein the infrared touch frame circuit board card comprises a main board and a plurality of slave boards; the host board is provided with a signal attenuation circuit, a signal amplifying and restoring circuit and an analog signal bus, wherein the host board is connected with each slave board through the analog signal bus; the host board sends control signals for controlling the infrared lamp tube to scan to each slave board through the analog signal bus; the signal attenuation circuit attenuates the control signal to obtain an attenuation signal, the attenuation signal is sent to the slave board, and the slave board restores the attenuation signal to a strong signal through the signal amplification and restoration circuit for processing; the slave board loads the analog electric signals converted from the infrared light signals onto the analog signal bus and transmits the analog electric signals to the master board, and the master board extracts the analog electric signals from the analog signal bus; according to the technical scheme, the sampling quality of infrared light signals is improved, and the performance of the infrared touch frame is improved.
Description
Technical Field
The application relates to the technical field of infrared touch control, in particular to an infrared touch frame circuit board card, an infrared touch frame and an infrared touch screen.
Background
In the infrared touch frame, a plurality of groups of infrared geminate transistors distributed and arranged around the display screen are utilized, infrared light is emitted by the infrared emitting tubes, the infrared receiving tubes are controlled to receive and convert infrared light signals into analog electric signals, a series of intensity adjustment is carried out on the infrared light signals, then A/D sampling is carried out on the infrared light signals, whether an object shields the infrared light or not is judged according to whether the signals after adjustment are changed or not, the touch operation condition is judged, corresponding position coordinate output is calculated, and the functions of clicking, line drawing, touch and the like of the infrared touch frame are realized.
In the touch positioning of the infrared touch frame, the quality of the infrared light signal directly influences the A/D sampling result and is reflected on the performance of the infrared touch frame, such as click accuracy, writing accuracy, line drawing effect and the like; because the infrared light signal belongs to a weak analog signal, and the control signal for controlling the infrared light scanning in the touch frame belongs to a strong digital signal, the data after the infrared light signal on the infrared touch frame circuit board card and the connecting wire is subjected to A/D sampling contains the interference signal component of the control signal, and the quality of the analog electric signal for the infrared light signal subjected to A/D sampling is influenced, so that the performance of the touch frame is influenced.
Disclosure of Invention
The application aims to solve one of the technical defects and provide an infrared touch frame circuit board card, an infrared touch frame and an infrared touch screen so as to reduce signal interference and improve the performance of the infrared touch frame circuit board card.
An infrared touch frame circuit board card comprising: a motherboard and a plurality of slave boards; the mainboard is provided with a signal attenuation circuit and a signal amplifying and restoring circuit; the host board is connected with each slave board through an analog signal bus;
The host board sends control signals for controlling the infrared lamp tube to scan to each slave board through the analog signal bus; the signal attenuation circuit attenuates the control signal to obtain an attenuation signal, the attenuation signal is transmitted to the slave board, and the slave board restores the attenuation signal into a strong signal through the signal amplification and reduction circuit for processing;
The slave board loads the analog electric signals converted from the infrared light signals onto the analog signal bus and transmits the analog electric signals to the master board, and the master board extracts the analog electric signals from the analog signal bus.
In one embodiment, the motherboard is further provided with a signal conditioning circuit, an A/D sampling circuit and a main MCU which are connected in sequence; the main MCU is connected with the signal attenuation circuit, and the signal conditioning circuit is connected with the analog signal bus;
The slave board is also provided with a slave MCU, and the slave MCU is connected with a signal amplifying and reducing circuit.
In one embodiment, the control signal is a strong digitized signal; the analog electric signal is a weak analog signal which is converted and output by the infrared receiving tube receiving infrared light signals.
In one embodiment, the connection line further includes a synchronization signal bus connected between the motherboard and the plurality of slave boards; the signal attenuation circuit is connected with the signal amplifying and restoring circuit through a synchronous signal bus;
the control signal is a synchronous signal for triggering the infrared lamp tube to scan;
The main board inputs the synchronous signal into the signal attenuation circuit to obtain an attenuation signal, and transmits the attenuation signal to the slave board through the synchronous signal bus.
In one embodiment, the synchronization signal is a PWM synchronization signal; wherein, the PWM synchronous signal is provided with a start signal of synchronous scanning and a PWM pulse signal.
In one embodiment, the signal attenuation circuit comprises a passive attenuation circuit or an active attenuation circuit; the signal amplifying and restoring circuit comprises an in-phase amplifying circuit, an anti-phase amplifying circuit or a triode amplifying circuit.
In one embodiment, the signal attenuation circuit attenuates the control signal by N times to obtain an attenuated signal, and the signal amplification and reduction circuit amplifies the attenuated signal by M times to obtain a strong signal; the attenuation signal is a signal which is transmitted in a collinear way with the analog electric signal and does not interfere with the analog electric signal.
In one embodiment, the motherboard acquires a first intensity of the control signal and detects a second intensity of the analog electrical signal, and calculates and sets an attenuation multiple N of the signal attenuation circuit according to the first intensity and the second intensity.
An infrared touch frame, comprising: the infrared touch frame circuit board card is provided with a touch screen; wherein the slave plate is connected with the infrared lamp tube array.
An infrared touch screen, comprising: the display screen and the infrared touch frame; wherein, infrared touch frame encloses to be established around the display screen.
The infrared touch frame circuit board card, the infrared touch frame and the infrared touch screen are characterized in that a main board firstly attenuates a transmitted control signal through a signal attenuation circuit to obtain an attenuation signal, the attenuation signal is transmitted to a slave board through an analog signal bus, and the slave board restores the attenuation signal into a strong signal through a signal amplification and restoration circuit for processing; the slave board loads the analog electric signal converted from the infrared light signal onto the analog signal bus and transmits the analog electric signal to the master board, so that the control signal and the analog electric signal are simultaneously transmitted on the analog signal bus; according to the technical scheme, when signals are transmitted, the control signals of the strong signals are attenuated into the weak signals to be transmitted, so that the influence of intersection of the control signals and analog electric signals of the weak signals on a transmission line is reduced, the influence on the quality of infrared light signals when the control signals are transmitted or processed is avoided, the sampling quality of the infrared light signals is improved, and the performance of an infrared touch frame is improved.
Furthermore, each slave board shares the analog signal bus, and analog electric signals are directly loaded onto the analog signal bus and are transmitted back to the host board, so that the circuit processing flow is simplified, the analog electric signals of each slave board are concentrated on the host board for processing, the response speed is high, and the frame rate of infrared scanning is improved.
Further, through the dynamic setting of the attenuation multiple and the amplification multiple, the infrared touch frame circuit board card is used in different scenes, stability of the control signal and the analog electric signal in the collinear transmission is ensured, and the function of the infrared touch frame is improved.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the structure of an infrared touch frame circuit board card of one embodiment;
FIG. 2 is a schematic diagram of an infrared touch frame structure of one embodiment;
FIG. 3 is a schematic diagram of an infrared touch frame structure of another embodiment;
FIG. 4 is a circuit block diagram of a circuit board card of one embodiment;
FIG. 5 is a schematic diagram of an exemplary PWM synchronization signal;
FIG. 6 is a timing diagram of the operation of an infrared touch frame circuit board card of one embodiment.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, but do not preclude the presence or addition of one or more other features, integers, steps, operations.
According to the infrared touch frame circuit board card provided by the application, under the connection and use scene of the circuit board card, aiming at the situation that signals with different strengths on the circuit board card are on the same circuit board or a connecting wire, a micro signal is easy to be interfered by a strong signal, so that the weak signal contains interference signal components, the communication device used on the circuit board card is provided, and the stability performance of the circuit board card is improved.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an infrared touch frame circuit board according to an embodiment, where the circuit board includes a motherboard and a plurality of slave boards, and the motherboard and the slave boards are connected through an analog signal bus; the motherboard is provided with a signal attenuation circuit and a signal amplifying and restoring circuit.
The host board sends control signals for controlling the infrared lamp tubes to scan to each slave board through an analog signal bus, the signal attenuation circuit attenuates the control signals to obtain attenuation signals, the attenuation signals are sent to the slave boards through the analog signal bus, and the slave boards recover the attenuation signals into strong signals through the signal amplification and reduction circuit for processing; wherein the strong signal at least meets the intensity requirement that the slave board can use.
The slave board loads the analog electric signals converted from the infrared light signals onto an analog signal bus and transmits the analog electric signals to the master board, and the master board extracts the analog electric signals from the analog signal bus.
In one embodiment, in the infrared touch frame circuit board card, the control signal is a strong digital signal, and the analog electrical signal transmitted from the motherboard to the motherboard is a weak analog signal converted and output by the infrared receiving tube.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an infrared touch frame according to an embodiment, in which a connection circuit portion between a motherboard and a slave board is shown, in the infrared touch frame according to the present application, the slave board may be connected with an infrared light tube, including an infrared transmitting tube and/or an infrared receiving tube, and the motherboard and the slave board are connected through an analog signal bus; as shown, the infrared touch frame circuit board card includes slave boards ① - ⑧, each of which shares an analog signal bus. For the motherboard, it may be used as a separate circuit board to connect to the slave board, or may be integrated on any slave board, and share a circuit board card with the slave board, as illustrated in the figure, the motherboard is integrated on the slave board ⑧, and if the motherboard is a separate circuit board, no infrared lamp tube is provided on the motherboard.
Because the infrared light signal belongs to a weak analog signal, and the control signal for controlling the infrared light in the touch frame to scan belongs to a strong digital signal, the weak analog signal and the strong digital signal exist on the same circuit board card or analog signal bus, and the working time sequence is intersected, the control signal is easy to interfere the acquisition of the infrared light signal, so that the signal intensity of the strong digital signal is reduced through the communication device of the circuit board card, and the influence on the sampling quality of the infrared light signal when the control signal is transmitted on the analog signal bus is avoided.
In one embodiment, for the signal attenuation circuit, it may include a passive attenuation circuit or an active attenuation circuit, which may be specific to the use requirements of this patent.
In one embodiment, the signal amplifying and recovering circuit may include an in-phase amplifying circuit, an inverting amplifying circuit, a triode amplifying circuit or the like, which may be specifically determined according to the use requirement of the present patent.
In one embodiment, the control signal used by the motherboard is a synchronization signal for triggering the infrared lamp tube to scan; the mainboard controls the infrared lamp tube to perform scanning work through the synchronous signal, inputs the synchronous signal into the signal attenuation circuit to obtain an attenuation signal, and sends the attenuation signal to the slave board through the analog signal bus; the slave board restores the attenuation signal input signal amplification and reduction circuit into a synchronous signal for controlling the infrared lamp tube to scan; the infrared lamp of the slave board receives the infrared light signal and outputs an analog electric signal, and the slave board directly loads the analog electric signal onto the analog signal bus and transmits the analog electric signal to the host board.
Specifically, the main board sends a synchronous signal to each slave board through the analog signal bus to control the corresponding slave board to scan; the host board attenuates the synchronizing signal input signal attenuation circuit by N times to obtain an attenuation signal, the attenuation signal does not influence the transmission of the analog electric signal, and after the attenuation signal is transmitted to the slave board, the slave board amplifies the attenuation signal input signal by M times through the amplifying and restoring circuit, so that the synchronizing signal which can be used for the slave board is obtained; the infrared lamp of the slave board receives the infrared light signal and outputs an analog electric signal, and the slave board directly loads the analog electric signal on the analog signal bus and transmits the analog electric signal to the host board.
In another embodiment, as shown in fig. 3, fig. 3 is a schematic diagram of an infrared touch frame of another embodiment, in which only a circuit portion related to the present application is shown, and an analog signal bus and a synchronization signal bus are included between a motherboard and a plurality of slave boards, wherein a signal attenuation circuit is connected to a signal amplifying and restoring circuit through the synchronization signal bus. In operation, the main board attenuates the synchronizing signal input signal attenuation circuit by N times to obtain an attenuation signal, and transmits the attenuation signal to the slave board through the synchronizing signal bus; amplifying the attenuation signal input signal by the slave board by M times by using a signal amplifying and restoring circuit, so as to obtain a synchronous signal which can be used by the slave board; and simultaneously, the analog electric signals are directly loaded on the analog signal bus from the motherboard to be transmitted to the motherboard.
In one embodiment, a signal conditioning circuit, an A/D sampling circuit and a main MCU (Microprocessor Control Unit, a microprocessor unit) which are sequentially connected are arranged on a motherboard of the circuit board; the main MCU is connected with the signal attenuation circuit, the signal conditioning circuit is connected with the analog signal bus, the slave MCU is arranged on the slave board, and the slave MCU is connected with the signal amplifying and restoring circuit.
As for the motherboard, as shown in fig. 4, fig. 4 is a circuit structure diagram of a circuit board card of an embodiment, wherein part of circuit elements of the motherboard are shown, and a signal conditioning circuit, an a/D sampling circuit and a main MCU are sequentially connected to the motherboard, wherein the signal conditioning circuit is connected to an analog signal bus, the main MCU is connected to the analog signal bus through a signal attenuation circuit, and in addition, if a separate synchronous signal bus is used to transmit a synchronous signal, the main MCU is connected to the synchronous signal bus through a signal attenuation circuit; for the analog signal bus, the analog signal bus can comprise a plurality of parallel signal channels, when the infrared receiving tubes adopt a group scanning mode, because a plurality of analog electric signals output by the infrared receiving tubes are generated at the same time, each signal channel can simultaneously transmit each analog electric signal to the mainboard.
For the slave board, as shown in fig. 4, the slave board may include a slave MCU, where the slave MCU may control an infrared transmitting tube and an infrared receiving tube connected to the slave board, and the master MCU performs data transmission with each slave MCU based on an address identification manner, and each slave board is configured with a hardware address.
The working principle of the infrared touch frame circuit board card can be as follows: the main MCU outputs a synchronous signal to the signal attenuation circuit, the signal attenuation circuit outputs an attenuation signal, the attenuation signal is transmitted to the slave board through the analog signal bus, the attenuation signal enters the signal amplifying and restoring circuit to be processed to obtain the synchronous signal, and the synchronous signal is sent to the slave MCU to be responded; the infrared receiving tube of the slave board receives an infrared light signal, converts the infrared light signal into an analog electric signal and loads the analog electric signal onto an analog signal bus, the signal conditioning circuit detects the analog electric signal from the analog signal bus and amplifies and conditions the analog electric signal, the A/D sampling circuit carries out A/D sampling on the amplified analog electric signal to obtain a digital signal, the digital signal is transmitted back to the main MCU, the main MCU analyzes and processes the digital signal, and the coordinate position of a touch object is calculated, or the digital signal is uploaded to an upper computer to calculate the coordinate position of the touch object, and the like.
In one embodiment, the synchronization signal used by the motherboard may be a PWM synchronization signal; wherein, the PWM synchronous signal is provided with a start signal of synchronous scanning and a PWM pulse signal; referring to fig. 5, fig. 5 is a schematic diagram of an exemplary PWM synchronization signal, where the pulse width of the start signal is different from the PWM pulse width of the switch lamp, as in the figure, the pulse width of the start signal is τ1, the PWM pulse width of the switch lamp is τ2, the time interval between the two is τ3, and the time interval τ3 is used to wait for the slave board to complete the analysis of the start signal and complete the buffering time for preparing the scan data, so as to facilitate the synchronization of each slave host to start the scan control; where τ1, τ2, τ3 are set time widths, e.g., τ1=4us, τ2=0.5 us, τ3= 59.35us; after the master board transmits the PWM synchronous signal to the slave host, the slave host analyzes the data of the PWM synchronous signal in real time, and starts a frame scan when the start signal is identified.
As the scheme of the embodiment, all slave boards can be driven to synchronously scan by one PWM synchronous signal, so that complex control logic is avoided.
In one embodiment, as shown in fig. 6, fig. 6 is a working timing diagram of an infrared touch frame circuit board card according to an embodiment, a motherboard firstly issues scan data to each slave board, and the scan data can be transmitted through a digital signal bus arranged between the motherboard and each slave board; the host board transmits the synchronous signal through the analog signal bus or a separate synchronous signal bus (if a digital signal bus is added, the synchronous signal can also be transmitted through the digital signal bus), and the slave board returns the analog electric signal through the analog signal bus.
When a plurality of slave boards of the infrared touch frame perform infrared scanning, as different slave boards are responsible for infrared light tubes at different positions, in order to distinguish data of different scanning, when the master board and the slave boards (a master MCU and a slave MCU) communicate, data transmission between devices needing communication is realized based on an address identification mode, for example, before the scanning starts, the master board respectively sends different scanning data to the corresponding slave boards based on the address identification mode; therefore, each slave board is provided with a hardware address, the firmware of all the slave boards can be unified by using the hardware address, the firmware of the slave boards is convenient to upgrade, and only one firmware is needed for all the slave boards.
In the scanning process, the slave board receives the analog electric signal converted by the infrared light signal from the infrared light tube and loads the analog electric signal onto the analog signal bus to be transmitted back to the host board, the host board detects the analog electric signal from the analog signal bus and converts the analog electric signal into a digital signal, and the host board calculates the coordinate position of the touch object or uploads the coordinate position to the upper computer to be calculated.
According to the scheme of the embodiment, each slave board shares the analog signal bus, analog electric signals are directly loaded onto the analog signal bus and are transmitted back to the host board to be converted into digital signals, the processing links for converting the analog signals into the digital signals on the slave boards are reduced, meanwhile, the time required for converting the analog signals with larger data quantity of the infrared light signals into the digital signals is relatively more, and after the digital signals are converted, the slave boards are required to be longer time required for transmitting the digital signals to the host board through the digital signal bus due to larger data quantity, the digital signal buses from each slave board to the host board are relatively longer, so that signal attenuation or distortion and time increase are easily caused, and the processing flow of a circuit is simplified by converting the infrared light signals received by the infrared light sources from the slave boards into the digital signals through the analog signals, the analog signals of each slave board are concentrated on the host board to be processed, and the response speed is high, and the frame rate of infrared scanning is improved.
In one embodiment, for the signal attenuation circuit of the motherboard, the attenuation multiple of the signal attenuation circuit can be set before use, for example, the signal attenuation circuit can be set to attenuate the control signal by N times to obtain an attenuation signal; meanwhile, for the signal amplifying and reducing circuit of the slave board, the amplifying times of the signal amplifying and reducing circuit can be set before use, for example, the signal amplifying and reducing circuit can be set to amplify the attenuated signal by M times to obtain a strong signal, so that the use requirement is met; for the signal attenuation circuit with the attenuation multiple and the signal amplification and reduction circuit with the amplification multiple, the attenuation signal obtained by the control signal and the analog electric signal obtained by the infrared light signal can be transmitted on the analog signal bus in a collinear way and are not interfered with each other.
In one embodiment, in order to enable the infrared touch frame circuit board card to be used in different scenes, the attenuation multiple of the signal attenuation circuit of the motherboard can be dynamically set; the motherboard can acquire the first intensity of the control signal, detect the second intensity of the analog electric signal at the same time, and then calculate the attenuation multiple N of the signal attenuation circuit according to the first intensity and the second intensity and set; specifically, the maximum intensity of the attenuation signal during collinear transmission can be determined according to the second intensity, and the attenuation multiple N of the signal attenuation circuit can be calculated and dynamically set by combining the maximum intensity of the attenuation signal and the first intensity of the control signal.
Furthermore, the amplification factor of the signal amplifying and reducing circuit of the slave board can be dynamically set, and as the slave board needs to meet a certain strength requirement when amplifying and reducing synchronous signals, the signal amplifying and reducing circuit amplifies the attenuation signal by M times to obtain a strong signal, and the amplification factor M can be calculated and dynamically set by combining the actual strength of the attenuation signal and the minimum strength needed by the slave board
According to the scheme of the embodiment, the attenuation multiple N and the amplification multiple M are dynamically set, so that the infrared touch frame circuit board card is used in different scenes, stability of synchronous signals and analog electric signals in collinear transmission is ensured, and the function of the infrared touch frame is improved.
Embodiments of an infrared touch frame and an infrared touch screen are described below.
The infrared touch frame of this embodiment includes a motherboard and a plurality of slave boards, where each slave board is connected to an infrared lamp tube array, as shown in fig. 2, the motherboard and each slave board may be connected through an analog signal bus, as shown in fig. 3, and the motherboard and each slave board may also be connected through an analog signal bus and a synchronization signal bus.
According to the infrared touch frame, the influence of the synchronous signals on the infrared light signals during transmission and processing is avoided, so that the infrared light signals with higher quality can be obtained, and the performance of the infrared touch frame is improved; each slave board shares an analog signal bus, and analog electric signals are directly loaded onto the analog signal bus and are transmitted back to the host board, so that the circuit processing flow is simplified, the analog electric signals of each slave board are concentrated on the host board for processing, the response speed is high, and the frame rate of infrared scanning is improved; through the dynamic setting of the attenuation multiple and the amplification multiple, the infrared touch frame circuit board card is used under different scenes, the stability of the control signal and the analog electric signal in the collinear transmission is ensured, and the function of the infrared touch frame is improved.
An example of an infrared touch screen is set forth below.
The infrared touch screen of the embodiment comprises a display screen and an infrared touch frame; wherein the infrared touch frame is arranged around the display screen in a surrounding way. According to the infrared touch screen of the embodiment, the infrared touch frame of the embodiment is adopted, so that an infrared light signal with higher quality can be obtained, and the performance of the infrared touch frame is improved; each slave board shares an analog signal bus, and analog electric signals are directly loaded onto the analog signal bus and are transmitted back to the host board, so that the circuit processing flow is simplified, the analog electric signals of each slave board are concentrated on the host board for processing, the response speed is high, and the frame rate of infrared scanning is improved; through the dynamic setting of the attenuation multiple and the amplification multiple, the infrared touch frame circuit board card is used under different scenes, the stability of the control signal and the analog electric signal in the collinear transmission is ensured, and the function of the infrared touch frame is improved.
It will be understood by those skilled in the art that all terms (including 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 unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The foregoing is only a partial embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the present application.
Claims (10)
1. An infrared touch frame circuit board card comprising: a motherboard and a plurality of slave boards; the signal attenuation circuit is arranged on the mainboard, and the signal amplifying and restoring circuit is arranged on the mainboard; the host board is connected with each slave board through an analog signal bus;
The host board sends control signals for controlling the infrared lamp tube to scan to each slave board through the analog signal bus; the signal attenuation circuit attenuates the control signal to obtain an attenuation signal, the attenuation signal is transmitted to the slave board, and the slave board restores the attenuation signal into a strong signal through the signal amplification and reduction circuit for processing;
The slave board loads the analog electric signals converted from the infrared light signals onto the analog signal bus and transmits the analog electric signals to the master board, and the master board extracts the analog electric signals from the analog signal bus.
2. The infrared touch frame circuit board card of claim 1, wherein the motherboard is further provided with a signal conditioning circuit, an A/D sampling circuit and a main MCU which are connected in sequence; the main MCU is connected with the signal attenuation circuit, and the signal conditioning circuit is connected with the analog signal bus;
The slave board is also provided with a slave MCU, and the slave MCU is connected with a signal amplifying and reducing circuit.
3. The infrared touch frame circuit board card of claim 1, wherein the control signal is a strong digitized signal; the analog electric signal is a weak analog signal which is converted and output by the infrared receiving tube receiving infrared light signals.
4. The infrared touch frame circuit board card of claim 3, wherein the connection lines further comprise a synchronization signal bus connected between the motherboard and the plurality of slave boards; the signal attenuation circuit is connected with the signal amplifying and restoring circuit through a synchronous signal bus;
the control signal is a synchronous signal for triggering the infrared lamp tube to scan;
The main board inputs the synchronous signal into the signal attenuation circuit to obtain an attenuation signal, and transmits the attenuation signal to the slave board through the synchronous signal bus.
5. The infrared touch frame circuit board card of claim 4, wherein the synchronization signal is a PWM synchronization signal; wherein, the PWM synchronous signal is provided with a start signal of synchronous scanning and a PWM pulse signal.
6. The infrared touch frame circuit board card of claim 1, wherein the signal attenuation circuit comprises a passive attenuation circuit or an active attenuation circuit; the signal amplifying and restoring circuit comprises an in-phase amplifying circuit, an anti-phase amplifying circuit or a triode amplifying circuit.
7. The infrared touch frame circuit board card according to claim 2, wherein the signal attenuation circuit attenuates the control signal by N times to obtain an attenuation signal, and the signal amplification and reduction circuit amplifies the attenuation signal by M times to obtain a strong signal; the attenuation signal is a signal which is transmitted in a collinear way with the analog electric signal and does not interfere with the analog electric signal.
8. The infrared touch frame circuit board card of claim 7, wherein the motherboard obtains a first intensity of the control signal and detects a second intensity of the analog electrical signal, and calculates and sets an attenuation multiple N of the signal attenuation circuit according to the first intensity and the second intensity.
9. An infrared touch frame, comprising: the infrared touch frame circuit board card of any one of claims 1-8; wherein the slave plate is connected with the infrared lamp tube array.
10. An infrared touch screen, comprising: a display screen and the infrared touch frame of claim 9; wherein, infrared touch frame encloses to be established around the display screen.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410178646.2A CN117931006A (en) | 2024-02-09 | 2024-02-09 | Infrared touch frame circuit board card, infrared touch frame and infrared touch screen |
| CN202410484614.5A CN118363494A (en) | 2024-02-09 | 2024-04-22 | Infrared touch frame circuit board card, infrared touch frame and infrared touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410178646.2A CN117931006A (en) | 2024-02-09 | 2024-02-09 | Infrared touch frame circuit board card, infrared touch frame and infrared touch screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117931006A true CN117931006A (en) | 2024-04-26 |
Family
ID=90760825
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410178646.2A Withdrawn CN117931006A (en) | 2024-02-09 | 2024-02-09 | Infrared touch frame circuit board card, infrared touch frame and infrared touch screen |
| CN202410484614.5A Pending CN118363494A (en) | 2024-02-09 | 2024-04-22 | Infrared touch frame circuit board card, infrared touch frame and infrared touch screen |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410484614.5A Pending CN118363494A (en) | 2024-02-09 | 2024-04-22 | Infrared touch frame circuit board card, infrared touch frame and infrared touch screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN117931006A (en) |
-
2024
- 2024-02-09 CN CN202410178646.2A patent/CN117931006A/en not_active Withdrawn
- 2024-04-22 CN CN202410484614.5A patent/CN118363494A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN118363494A (en) | 2024-07-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110418060B (en) | Image correction method and system of high-speed camera | |
| US8896705B2 (en) | Measuring device and associated method for measuring response speed of display panel | |
| JPWO2020129685A1 (en) | Communication equipment and communication methods, and programs | |
| US9785265B2 (en) | Real-time remote control system for semiconductor automation equipment | |
| CN110930910B (en) | Method and device for processing signals in display panel | |
| CN117931006A (en) | Infrared touch frame circuit board card, infrared touch frame and infrared touch screen | |
| JPH09307562A (en) | Optical network equipment | |
| JP2012137379A (en) | X-ray detector | |
| CN117939031B (en) | Multi-camera synchronous image acquisition card and application method thereof in image acquisition | |
| WO2003065341A3 (en) | Apparatus and method for interfacing a digital video signal having a tdms format with a plurality digital video interface receivers | |
| CN110418079B (en) | Image signal conversion device | |
| US8347013B2 (en) | Interface card with extensible input/output interface | |
| CN102932668A (en) | USB (universal serial bus) transmission based audio-video data processing device | |
| CN213659417U (en) | VGA and keyboard and mouse signal transmission system with 2-out-of-16 function | |
| CN209821622U (en) | Signal acquisition system | |
| CN201107769Y (en) | Image signal compensation apparatus | |
| CN210112162U (en) | Video processing module capable of realizing multi-channel video signal output and acquisition | |
| US9152242B2 (en) | Optical navigator device and its transmission interface including quick burst motion readout mechanism | |
| US5613156A (en) | Imaging system with 1-N Parallel channels, each channel has a programmable amplifier and ADC with serial controller linking and controlling the amplifiers and ADCs | |
| CN118034528A (en) | Infrared touch frame circuit board, infrared touch frame and infrared touch screen | |
| CN221042979U (en) | Image pickup assembly and electronic device | |
| CN209947083U (en) | AI processing system | |
| CN106896754B (en) | Device for generating trigger signal in PXIe bus | |
| CN214070031U (en) | Video processing platform | |
| WO2023187923A1 (en) | Image data transmission and reception system, image data transmission and reception method, and component mounting machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20240426 |
|
| WW01 | Invention patent application withdrawn after publication |