CN116661628B - Infrared touch circuit - Google Patents
Infrared touch circuit Download PDFInfo
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- CN116661628B CN116661628B CN202310327416.3A CN202310327416A CN116661628B CN 116661628 B CN116661628 B CN 116661628B CN 202310327416 A CN202310327416 A CN 202310327416A CN 116661628 B CN116661628 B CN 116661628B
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- 239000011159 matrix material Substances 0.000 claims abstract description 47
- 238000010586 diagram Methods 0.000 description 9
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention relates to an infrared touch circuit, which comprises a control circuit and at least two board cards connected end to end through a column control bus, wherein a row control circuit, an infrared emission lamp tube and/or an infrared receiving lamp tube matrix, a column driving circuit and a row driving circuit are arranged on the board cards; each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix are connected with the corresponding row driving circuit; each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix are connected with the corresponding row driving circuit; the control circuit is connected with the infrared emission lamp and/or each row of infrared emission lamp of the infrared receiving lamp matrix or the control end of the row driving circuit corresponding to the infrared receiving lamp through the row control bus; the infrared touch control circuit has the advantages of simpler circuit connection, enlarged usable area of the board card and reduced circuit cost.
Description
Technical Field
The invention relates to the technical field of infrared touch screens, in particular to an infrared touch circuit.
Background
In a general infrared touch frame, each board card needs to use a shift register and a decoder to control the emission or the receiving of an infrared lamp tube, so that a circuit is complex, the available area on the board card is narrowed, wiring is affected, and meanwhile, the circuit cost is high.
Disclosure of Invention
Accordingly, the present invention is directed to an infrared touch circuit, which has the advantages of simplified wiring on a board and reduced cost.
The infrared touch control circuit comprises a control circuit and at least two board cards which are connected end to end through a column control bus, wherein a row control circuit, an infrared emission lamp tube and/or infrared receiving lamp tube matrix, a column driving circuit and a row driving circuit are arranged on the board cards;
Each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix are connected with the corresponding row driving circuit;
each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix are connected with the corresponding row driving circuit;
The control circuit is connected with the infrared emission lamp and/or each row of infrared emission lamp of the infrared receiving lamp matrix or the control end of the row driving circuit corresponding to the infrared receiving lamp through the row control bus;
The control circuit is connected with the control end of the row driving circuit corresponding to each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix through the row control circuit.
An infrared touch device comprises the infrared touch circuit and a frame; the infrared touch circuit is arranged on the frame.
An infrared touch display screen comprises a display screen and the infrared touch device, wherein the infrared touch device is assembled with the display screen in a matching way.
According to the infrared touch control circuit, the control circuit sends out a column driving signal through the column control bus, after the column driving circuit corresponding to the board card receives the column driving signal, the column driving circuit is conducted, the control circuit sends out a row control signal to the corresponding row control circuit, the row control circuit converts the row control signal into a row driving signal and sends the row driving signal to the corresponding driving circuit in the corresponding board card, the row driving circuit receives the row driving signal and conducts, and the infrared emission lamp tube and/or the infrared receiving lamp tube matrix forms a conducting closed loop with a power supply according to the conducting column driving circuit and the row driving circuit, so that the infrared emission lamp tube or the infrared receiving lamp tube where the corresponding row and column are located is lightened.
Compared with the common board card control circuit, the control circuit in the application does not need to additionally connect a decoder of a row control signal on each board card, so that the circuit connection is simpler, the usable area on the board card is enlarged, and the circuit cost is reduced.
For a better understanding and implementation, the present invention is described in detail below with reference to the drawings.
Drawings
FIG. 1 is a circuit matrix of infrared transmitting lamps and/or infrared receiving lamps on a single board in the prior art;
FIG. 2 is a schematic diagram illustrating connection of multiple boards according to an embodiment of the present application;
FIG. 3 is a schematic circuit diagram of an infrared touch circuit on a monolithic board according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an infrared touch circuit on a monolithic board according to another embodiment of the present application;
fig. 5 is a schematic circuit diagram of an infrared touch circuit on a single board card according to another embodiment of the application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In the infrared touch frame, a plurality of groups of infrared geminate transistors are distributed and arranged around, and a plurality of infrared emitting lamp tubes and/or infrared receiving lamp tubes are distributed on the head-to-tail spliced board cards, and the board cards are connected through connectors. If only an infrared emission lamp tube array is arranged on one board, the board is generally called an infrared emission board, and if only an infrared receiving lamp tube array is arranged on one board, the board is generally called an infrared receiving board; in some cases, the infrared tube array on one board is provided with both infrared emitting tubes and infrared receiving tubes, depending on the overall technical scheme. Each board card controls the row matrix of the infrared emission lamp tube, the infrared receiving lamp tube and/or the infrared receiving lamp tube through the shift register and the decoder, and the accurate control of each infrared emission lamp tube or each infrared receiving lamp tube is realized through the control of the shift register and the decoder. And then sampling the infrared signal received by the infrared receiving lamp tube, judging whether an object shields infrared light according to whether the signal subjected to adjustment stabilization changes, judging the touch operation condition, outputting corresponding position coordinates, and realizing the functions of touch, writing and the like of the infrared touch frame.
Referring to fig. 1, fig. 1 is a circuit matrix of infrared transmitting lamps and/or infrared receiving lamps on a single board in the prior art. As shown in fig. 1, each board card generally has 6 to 8 rows of infrared emission lamps and/or infrared receiving lamps, and one pin is required for controlling each row of infrared emission lamps or infrared receiving lamps, and pins with zero clearing or other functions are also required. As shown in fig. 2, fig. 2 is a schematic diagram of connection between boards, since each board is connected through a connection terminal, if control pins for an infrared emission lamp or an infrared receiving lamp and/or an infrared receiving lamp array and other functional pins are directly controlled from a Microprocessor (MCU), the number of pins of the connection terminal is insufficient. Therefore, each board card in the infrared touch frame in the prior art must be controlled as shown in fig. 1 by simultaneously arranging a shift register and a decoder on the same board card, taking Q0 and Q1 … Qn of the shift register as row control signals, taking serial buses CLK (clock signals), DATA signals and MR (clear signals) as column control chips, taking Y0 and Y1 … Yn as column control signals, and taking parallel running wires a0\a1\a2 (address lines) and EN (enable lines) to reduce the total number of control lines from a Microprocessor (MCU) to each board card so as to meet the requirement of limiting the number of pins of connecting terminals. In the prior art, as each board card is provided with the shift register and the decoder at the same time, the pin number of the connecting terminals between the board cards is reduced, the requirements of the existing connecting terminals are met, but the cost is high and the control is complex.
Aiming at the problems, the application creatively provides a novel technical scheme, and the control of directly controlling the signals of each transmitting tube row of each board card by a microprocessor can be realized under the condition of limited pins of a connecting terminal through design change on a hardware architecture, and specifically comprises the following steps:
Referring to fig. 3 and fig. 2, fig. 3 is a schematic circuit diagram of an infrared touch circuit on a single board card according to an embodiment of the application; fig. 2 is a schematic connection diagram of a plurality of boards, wherein fig. 2 is not a modification of the present embodiment. As shown in fig. 2, two or more boards 20 are connected end to end through a column control bus, each column control bus is respectively connected with the control end of a column driving circuit 23 of each column infrared emission lamp or infrared receiving lamp of each board, and transmits column driving signals, and the column control buses on all boards are connected in parallel; the shift registers of two or more boards are also connected with each other through a row control bus, and the shift registers are connected in series.
Referring to fig. 3, the infrared touch circuit on the single board card includes a control circuit 10, a plurality of board cards 20 connected end to end through a column control bus and a row control bus, and each board card 20 includes a row control circuit 21, an infrared emitting lamp and/or infrared receiving lamp matrix 22, a column driving circuit 23, and a row driving circuit 24. Each column of infrared transmitting lamps or infrared receiving lamps of the infrared transmitting lamp matrix 22 is connected to a corresponding column driving circuit 23. Each row of infrared transmitting tubes or infrared receiving tubes of the infrared transmitting tube matrix 22 is connected to a corresponding row driving circuit 24. The control circuit 10 is connected to the infrared emission lamp and/or each column of the infrared emission lamp matrix 22 or the control end of the column driving circuit 23 corresponding to the infrared emission lamp through a column control bus. The control circuit 10 is connected to the control end of the row driving circuit 24 corresponding to each row of infrared emission lamps or infrared receiving lamps of the infrared emission lamp matrix 22 through a row control circuit.
In the infrared touch control circuit of the present embodiment, the control circuit 10 sends out a column driving signal, the column driving circuit 23 in the board 20 receives the column driving signal, the column driving circuit 23 is turned on, the control circuit 10 sends out a row control signal to the row control circuit 21 in the board 20, the row control circuit 21 converts the row control signal into a row driving signal and sends the row driving signal to the corresponding row driving circuit 24, and the row driving circuit 24 is turned on. The infrared emission lamp and/or the infrared receiving lamp matrix 22 forms a closed loop with the power supply according to the turned-on column driving circuit 23 and the turned-on row driving circuit 24, and drives the infrared emission lamp and/or the infrared receiving lamp corresponding to the rows and columns in the infrared emission lamp and/or the infrared receiving lamp matrix 22.
Specifically, the control circuit 10 includes a controller 11, and in this embodiment, the controller 11 may be a microprocessor MCU. The column driving signal output end of the control circuit 10 is an IO port of the controller 11, and the IO port of the controller 11 is directly connected to each column of infrared emission lamps and/or infrared receiving lamps of the infrared receiving lamp matrix 22 through a column control bus, corresponding to the column driving circuit 23. The column driving signals sent by the IO port of the controller 11 control the conduction of the driving circuits 23 of the corresponding columns, and the row driving signals sent by the row control circuit 21 control the conduction of the row driving circuits 24 of the corresponding rows, so that the infrared emission lamp tubes or the infrared receiving lamp tubes at the corresponding positions are lightened.
The row control circuit 21 includes a shift register 211 and a logic gate circuit 212, wherein a data input end and a clock signal input end of the shift register 211 are respectively connected with a data output end and a clock signal output end of the controller 11, and a data output end of the shift register 211 is respectively connected with a row driving circuit 24 corresponding to each row of infrared emission lamp and/or infrared receiving lamp of the infrared receiving lamp matrix 22. One input terminal of the logic gate circuit 212 is connected to any one of the column control buses, an output terminal of the logic gate circuit 212 is connected to a reset terminal of the shift register 211, and the other input terminal of the logic gate circuit 212 is connected to any other one of the clock signal input terminal of the shift register 211 or the column control bus. Any other control bus referred to herein specifically refers to a logic gate 212 having two inputs connected to different column control buses, respectively, when both inputs are connected to the column control buses.
In the prior art, in order to expand the IO resources of the controller 11, the decoder is necessarily arranged on each board card, and the decoder is controlled by a few IOs of the controller 11, so that the limited quantity of connecting terminals between the board cards is simultaneously met, and the IO control expansion of the controller 11 is also met; in addition, in the prior art, due to the insufficient resources of the IO port of the controller 11, the reset terminal of the shift register 211 must be controlled by the IO port of the decoder. In this embodiment, through the arrangement of the logic gate 212 and multiplexing the column control bus at the input end of the logic gate 212, the IO port resource of the controller 11 is saved, thereby saving the decoder for expanding the IO port resource of the controller 11, simultaneously saving the number requirement of pins of the connecting terminal, having more direct circuit control and lower hardware cost, and being capable of making the circuit board narrower, and meeting the product requirement of the current narrow frame.
Optionally, the shift register 211 is the shift register 74HC164, a buffer circuit is connected between the shift register 211 and the controller 11, and the buffer circuit is an important protection circuit for power electronic devices, and is used for normal operation of the protection circuit in this embodiment, so that the shift register 211 can accurately receive the row control signal sent by the controller 11, thereby sending the control signal to the infrared emission lamp and/or the infrared receiving lamp matrix 22, and ensuring normal operation of the infrared emission circuit.
The logic gate 212 may be an integrated logic chip or a discrete device.
When the technical scheme of the embodiment is applied to the infrared emission plate, all infrared triodes on the infrared emission plate are infrared emission lamp tubes, all infrared receiving lamp tubes are grouped, and when all infrared receiving lamp tubes of one infrared receiving lamp tube group work simultaneously, the whole circuit works in a working mode that the infrared emission lamp tubes in the receiving range of the infrared receiving lamp tube group emit sequentially. The control logic is specifically as follows: the controller 11 controls the first group of infrared receiving lamp tube groups to be in a working state (namely a receiving state), meanwhile, the controller 11 drives the row driving circuit 24 to select one row in the infrared transmitting lamp tube array through the shift register 211, and then the controller 11 sequentially gates through the column driving circuit 23, so that the infrared transmitting lamp tubes in the receiving range of the infrared receiving lamp tube groups are sequentially transmitted. When the first group of infrared receiving lamp tube groups complete receiving and are switched to the second group of infrared receiving lamp tube groups to be in a working state, the controller 11 controls the shift register 211 to reset and clear through the logic gate circuit 212, and all infrared transmitting lamp tubes are in an initial state.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of an infrared touch circuit on a single board card according to another embodiment of the application. At this time, the logic gate 212 is an or gate, two input terminals of the logic gate 212 are respectively connected to two different column control buses, and any two column control buses are used as inputs (0 represents enable and 1 represents close) of the logic gate 212, so that the input state of the logic gate 212 is one of four states of 00, 01, 10 or 11, and no 00 state exists in normal state (i.e. when one row is selected, two columns are not simultaneously opened, otherwise, two infrared emission lamps will be simultaneously lighted for one row matrix, and the infrared emission lamps are sequentially and singly lighted under the condition of the working mode). When the first group of infrared receiving lamp tube groups complete receiving and switch to the second group of infrared receiving lamp tube groups to be in a working state, the controller 11 controls the two rows of control buses of the two input ends of the logic gate circuit 212 to be 00, at this time, when the logic gate circuit 212 is in the 00 state, the logic output of the logic gate circuit 212 is 0, at this time, the zero clearing input end which is just taken as the shift register 211 recognizes the low level for clearing 0. In one embodiment, the logic gate 212 may also be configured as a NOT gate, with the control logic being adapted.
Referring to fig. 3, when the logic gate 212 is a nand gate, an output terminal of the nand gate is connected to a reset terminal of the shift register 211, and two input terminals of the nand gate are respectively connected to any one of a clock signal input terminal of the shift register 211 and a column control bus. The input state of logic gate 212 is also one of the four states 00, 01, 10 or 11, and normally there will be no 00 state (i.e., there will be no two columns simultaneously on for a row and column matrix, otherwise there will be two infrared emitting lamps simultaneously on for a column and column matrix, in which case the infrared emitting lamps are individually illuminated in sequence). When the logic gate 212 operates, the types of signals received at the input of the logic gate 212 include a high level clock signal and a high level column driving signal (i.e., series 00), a low level clock signal and a high level column driving signal (i.e., series 10), a high level clock signal and a low level column driving signal (i.e., series 01), and a low level clock signal and a low level column driving signal (i.e., series 11), the logic gate 212 compares the signals received at the input, and outputs a high level signal or a low level signal corresponding to the types of signals at the output of the logic gate 212. In one embodiment, the clear condition of the shift register 211 is that the reset terminal of the shift register 211 receives a low level signal. The logic gate circuit 212 judges the received signals, and combines the clock signal of the set shift register 211 and the control time sequence of the column control signals, so that the shift register 211 can be controlled to complete the zero clearing operation at the corresponding time. Specifically, when the first group of infrared receiving lamp tube groups complete receiving and switch to the second group of infrared receiving lamp tube groups to be in an operating state, the controller 11 controls the column control signals and clock signals of the two input ends of the logic gate circuit 212 to be 01, and when the logic gate circuit 212 is in the 00-state, the logic gate circuit 212 is a NOT gate, the logic output of the logic gate circuit 212 is 1, and at the moment, the zero clearing input end just serving as the shift register 211 recognizes a low level for zero clearing. In one embodiment, the logic gate 212 may also be configured as an OR gate, with the control logic thereof being adapted.
After the decoder on each board is removed, which is used as a column controller, the number of control buses from the control circuit 10 to the board has been reduced to some extent, and at this time, if the number of pins of the connector is satisfied, the clearing of the shift register 211 can also be directly controlled by the IO port of the control circuit 10. Specifically, as follows, the row control circuit 21 may include a shift register 211, where a data input end and a clock signal input end of the shift register 211 are respectively connected to a data output end and a clock signal output end of the control apparatus 11, and a data output end of the shift register 211 is respectively connected to a corresponding row driving circuit 24 of a corresponding infrared emission lamp and/or infrared receiving lamp matrix 22, and a reset end of the shift register 211 is directly connected to a clear signal output end of the control circuit 10. The clear signal output end of the control circuit 10 is an IO port of the controller 11. The control circuit 10 sends a control signal to the reset end of the shift register 211 through the IO port, so as to control the shift register 211 to implement a zero clearing operation, which is not shown in the specific figure.
In the present embodiment, the column driving circuit 23 includes a first switching transistor, and the row driving circuit 24 includes a second switching transistor; each row of infrared emission tubes or infrared receiving tubes of the infrared emission tube and/or infrared receiving tube matrix 22 is connected with a corresponding first switch tube; each row of infrared transmitting tubes or infrared receiving tubes of the infrared transmitting tube matrix 22 is connected with a corresponding second switching tube. The control circuit 10 is connected with the control end of a first switch tube corresponding to each row of infrared emission lamp tubes or infrared receiving lamp tubes of each board card through a row control bus; the control circuit 10 is connected with the control end of the second switch tube corresponding to each row of infrared emitting lamp tubes or infrared receiving lamp tubes of each board card through the row control circuit 21. In one embodiment, the power supply is grounded through the series resistor of the first switch tube, the infrared emission tube or the infrared receiving tube and the second switch tube, and when the first switch tube and the second switch tube are simultaneously conducted, the corresponding infrared emission tube or the corresponding infrared receiving tube is lightened.
Specifically, the first switching tube and the second switching tube are triodes, and each row of infrared emission tubes or infrared receiving tubes of the infrared emission tube matrix 22 is connected with a corresponding triode; each row of infrared transmitting tubes or infrared receiving tubes of the infrared transmitting tube matrix 22 is connected with a corresponding triode. The control circuit 10 is connected with the base electrode of the triode corresponding to each row of infrared emission lamp tubes or infrared receiving lamp tubes of each board through a row control bus; the control circuit 10 is connected with the base electrode of the triode corresponding to each row of infrared emitting lamp tubes or infrared receiving lamp tubes of each board through the row control circuit 21. The control circuit 10 sends out a column driving signal and the row driving signal sent out by the row control circuit 21 controls the corresponding triode to be conducted, so that the infrared emission lamp and/or the infrared emission lamp or the infrared receiving lamp at the corresponding position in the infrared receiving lamp matrix 22 are lightened. A current limiting resistor is connected between the base of the transistor and the corresponding column control bus, and a current limiting resistor is connected between the base of the transistor and the corresponding row control circuit 21, and is used for protecting the transistor and avoiding burning the transistor due to overlarge current.
The row control circuit 21 in this embodiment is not limited to the row control circuit 21 in this embodiment. The row control circuit 21 in this embodiment implements row control of the infrared emission lamps and/or the infrared receiving lamp matrix, and in other embodiments, a circuit that can implement this function may be used for the row control circuit 21 in this embodiment.
Referring to fig. 5, fig. 5 is a schematic circuit diagram of an infrared touch circuit on a single board card according to another embodiment of the application. In the case that the IO port of the controller 11 is insufficient, for example, some low-end series products use a microprocessor with general performance as the controller 11, the IO port resources of the microprocessor may be relatively tense, in which case, the control circuit 10 may further include a decoder 12, the decoder 12 is in communication with the controller 11, the resources of the IO port of the controller 11 are extended by the decoder 12, and the decoder 12 is connected to the control end of the column driving circuit 23 in each board 20 through the column control bus, so that the controller 11 controls the column driving circuit 23 in the corresponding column in each board 20 through the decoder 12 and the column control bus. The decoder 12 is a logic circuit with decoding function, which can interpret the encoded control signals and convert them into driving signals for each row of infrared emission lamps or infrared receiving lamps. In this embodiment, the decoder 12 is a 74HC138.
The column driving signal output end of the control circuit 10 is the signal output end of the decoder 12, and the signal output end of the decoder 12 is directly connected with the control end of the column driving circuit 23 corresponding to each column infrared emitting lamp or infrared receiving lamp of each board card through a column control bus. The decoder 12 converts the column control signal output from the controller 11 into a column driving signal. The column driving circuit 23 receives a column driving signal from the signal output end of the decoder 12, and the row driving circuit 24 receives a row driving signal from the row control circuit 21, so as to light up the infrared emission lamp and/or the infrared emission lamp or the infrared receiving lamp at the corresponding position of the infrared receiving lamp matrix 22. Specifically, the controller 11 and the decoder 12 are arranged on a certain board card, for example, the controller 11 and the decoder 12 for outputting column driving signals are arranged on a first board card, the row signal control on the first board card still adopts the original shift register control row and the decoder controls the columns, and the output Y0-Yn of the decoder on the first board is used as a bus for each board card to transmit the column control at the beginning of the second board, so that the mode of only reserving the decoder on the first board saves IO ports of the controller 11 and greatly reduces the complexity and cost of other transmitting board cards.
In the infrared touch control circuit of the present embodiment, the controller 11 or the decoder 12 in the control circuit 10 sends a column driving signal through the column control bus, the corresponding column driving circuit 23 in the board 20 receives the column driving signal, the column driving circuit 23 is turned on, the controller 11 in the control circuit 10 sends a row control signal to the shift register 211 in the board 20, the shift register 211 converts the row control signal into a row driving signal and sends the row driving signal to the corresponding row driving circuit 24, and the row driving circuit 24 is turned on. The infrared emission lamp and/or the infrared receiving lamp matrix 22 forms a closed loop with the power supply according to the turned-on column driving circuit 23 and the turned-on row driving circuit 24, and the infrared emission lamp and/or the infrared receiving lamp corresponding to the rows and columns in the infrared emission lamp and/or the infrared receiving lamp matrix 22 are lighted.
Compared with the existing infrared touch control circuit, the control circuit does not need to additionally arrange a decoder on each board card, so that the circuit connection is simpler, the usable area on the board card is enlarged, and the circuit cost is reduced.
In this embodiment, the control circuit may be disposed on any one of the plurality of boards. Through setting up control circuit on arbitrary board card in a plurality of board cards, can reduce infrared emission circuit's volume, enlarged the usable floor area on other board cards simultaneously, reduce circuit cost.
Alternatively, the control circuit may be disposed outside of the plurality of boards. Through setting up control circuit outside a plurality of integrated circuit boards, when control circuit breaks down, the maintenance of being convenient for.
The invention also provides an infrared touch device which comprises the infrared touch circuit and a frame; the infrared touch circuit is arranged on the frame.
The invention also provides an infrared touch display screen, which comprises a display screen and the infrared touch device, wherein the infrared touch device is assembled with the display screen in a matching way.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (12)
1. An infrared touch circuit is characterized in that: the infrared light emitting device comprises a control circuit and at least two board cards which are connected end to end through a column control bus, wherein a row control circuit, an infrared emission lamp tube and/or an infrared receiving lamp tube matrix, a column driving circuit and a row driving circuit are arranged on the board cards;
Each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix are connected with the corresponding row driving circuit;
each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix are connected with the corresponding row driving circuit;
The control circuit is connected with the infrared emission lamp and/or each row of infrared emission lamp of the infrared receiving lamp matrix or the control end of the row driving circuit corresponding to the infrared receiving lamp through the row control bus;
The control circuit is connected with the control end of the row driving circuit corresponding to each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix through the row control circuit.
2. The infrared touch circuit of claim 1, wherein:
The row control circuit comprises a shift register and a logic gate circuit, wherein the data input end and the clock signal input end of the shift register are respectively connected with the data signal output end and the clock signal output end of the control circuit, and the data output end of the shift register is respectively connected with the control end of the row driving circuit;
One input end of the logic gate circuit is connected with any one of the column control buses, and the other input end of the logic gate circuit is connected with any other one of the column control buses or the clock signal input end of the shift register; and the output end of the logic gate circuit is connected with the reset end of the shift register.
3. The infrared touch circuit of claim 2, wherein: the logic gate circuit comprises a NAND gate circuit, two input ends of the NAND gate circuit are respectively connected with any one of the clock signal input end of the shift register and the column control bus, and the output end of the NAND gate circuit is connected with the reset end of the shift register.
4. The infrared touch circuit of claim 2, wherein: the logic gate circuit comprises an OR gate circuit, wherein the input end of the OR gate circuit is respectively connected with any two of the control buses, and the output end of the OR gate circuit is connected with the reset end of the shift register.
5. The infrared touch circuit of claim 1, wherein: the row control circuit comprises a shift register, wherein a data input end and a clock signal input end of the shift register are respectively connected with a data signal output end and a clock signal output end of the control circuit, a data output end of the shift register is respectively connected with a control end of the row driving circuit, and a reset end of the shift register is directly connected with a zero clearing signal output end of the control circuit.
6. The infrared touch circuit of any of claims 2 to 5, wherein: the control circuit comprises a controller and a decoder, wherein the controller controls the column control buses through the decoder, and each column control bus is connected with the control end of a column driving circuit corresponding to a corresponding column infrared emission lamp or an infrared receiving lamp of the infrared emission lamp and/or infrared receiving lamp matrix;
the data input end and the clock signal input end of the shift register are respectively connected with the data signal output end and the clock signal output end of the controller.
7. The infrared touch circuit of any of claims 2 to 5, wherein: the control circuit comprises a controller, wherein the controller is directly connected with the column control buses, and each column control bus is connected with the control end of a column driving circuit corresponding to a corresponding column infrared emission lamp tube or an infrared receiving lamp tube of the infrared emission lamp tube and/or infrared receiving lamp tube matrix;
the data input end and the clock signal input end of the shift register are respectively connected with the data signal output end and the clock signal output end of the controller.
8. The infrared touch circuit of claim 1, wherein: the column driving circuit comprises a first switching tube, and the row driving circuit comprises a second switching tube;
each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix are connected with the corresponding first switch tube;
Each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix are connected with the corresponding second switch tube;
The control circuit is connected with the control ends of the first switch tubes corresponding to each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix through the row control bus;
The control circuit is connected with the control end of the second switch tube corresponding to each row of infrared emission lamp tubes or infrared receiving lamp tubes of the infrared emission lamp tube and/or infrared receiving lamp tube matrix through the row control circuit.
9. The infrared touch circuit of claim 1, wherein: the control circuit is arranged on any board card;
or the control circuit and any board card are mutually independent.
10. The infrared touch circuit of claim 2, wherein: the board card comprises an infrared emission board, an infrared emission lamp tube array is arranged on the infrared emission board, and when a first infrared emission lamp tube set is switched to a second infrared emission lamp tube set, the control circuit controls the shift register to reset and clear through the logic gate circuit.
11. An infrared touch device, characterized in that: comprising an infrared touch circuit and a bezel as claimed in any one of claims 1-10; the infrared touch circuit is arranged on the frame.
12. An infrared touch display screen, characterized in that: comprising a display screen and an infrared touch device as claimed in claim 11, said infrared touch device being matingly assembled with said display screen.
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| CN117705011A (en) * | 2024-02-06 | 2024-03-15 | 浙江托普云农科技股份有限公司 | Leaf area calculation method and application based on infrared detection living leaf area measuring instrument |
| CN118363495B (en) * | 2024-06-19 | 2024-08-23 | 广州众远智慧科技有限公司 | Infrared touch circuit, scanning method thereof and infrared touch screen |
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| CN109525274A (en) * | 2018-12-27 | 2019-03-26 | 熊业冬 | Driving device based on infrared transmitting tube and infrared receiving tube |
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| US20100026666A1 (en) * | 2007-02-02 | 2010-02-04 | Fineir Technology (Far East) Co, | Infrared transmitting or receiving circuit board unit and infrared touch screen using the same |
| CN103809811B (en) * | 2012-11-05 | 2017-04-05 | 深圳市艾博德科技股份有限公司 | The Serial Control circuit of infrared touch panel |
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| CN111540299A (en) * | 2020-06-23 | 2020-08-14 | 广州博锐电子有限公司 | Scanning circuit of infrared screen |
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