CN207115064U - Electronic blackboard and its electronic writing system based on bipolar Hall integrated circuit - Google Patents

Abstract

The utility model discloses an electronic blackboard based on bipolar hall integrated circuit, it includes a plurality of L ED monomer, and is a plurality of L ED monomer is arranged and is formed electronic blackboard, L ED monomer includes a plurality of L ED chips and bipolar hall integrated circuit, and is a plurality of L ED chip with bipolar hall integrated circuit electricity is connected, bipolar hall integrated circuit responds to the polarity in magnetic field around, and the foundation the polarity control in magnetic field L ED free bright going out, the utility model discloses a display efficiency is high, simple structure, low in production cost and later stage maintenance cost are low, can reequip on current equipment with the preparation do the utility model discloses an electronic blackboard based on bipolar hall integrated circuit for current equipment can correspond the bright going out that shows L ED according to the polarity in magnetic field around and realize the electronic blackboard function, and expansibility is stronger, the utility model also discloses an electronic writing system.

Description

Electronic blackboard and its electronic writing system based on bipolar Hall integrated circuit

technical field

The utility model relates to the technical field of semiconductors, in particular to an electronic blackboard based on a bipolar Hall integrated circuit and an electronic writing system thereof.

Background technique

Blackboard and chalk are the most commonly used teaching props in teaching, and traditional blackboard and chalk will produce a lot of dust during the teaching process, which will easily cause pneumoconiosis and various acute and chronic respiratory diseases among teachers and students. With the rapid development of multimedia technology, the traditional blackboard and chalk can no longer meet the needs of multimedia teaching, in this case, the electronic blackboard came into being. In the existing electronic blackboard technology, an LED dot matrix display panel, an electrophoretic display panel or an electronic ink display panel is usually used as the display panel of the electronic blackboard. The LED dot matrix display panel is widely used in teaching as a teaching prop because of its low cost. However, the writing efficiency of the LED dot matrix display panel of the electronic blackboard is low, the structure is too complicated, the production cost is high, and the later maintenance cost is high.

Therefore, it is necessary to provide an electronic blackboard and an electronic writing system with high writing efficiency, high display efficiency, simple structure, low production cost and low maintenance cost that can be widely used in writing and display fields.

Utility model content

The purpose of this utility model is to provide an electronic blackboard based on a bipolar Hall integrated circuit. The electronic blackboard is formed by arranging and assembling a plurality of LED monomers, wherein the LED monomer is provided with at least one lighting LED chip and The bipolar Hall integrated circuit that controls the LED chip on and off can display the LED on and off according to the polarity of the surrounding magnetic field, and can use the corresponding N polarity magnet or S polarity magnet to control the LED on and off , the electronic blackboard has high display efficiency, simple structure, low production cost and low post-maintenance cost, and can be refitted on existing equipment to make the electronic blackboard based on bipolar Hall integrated circuits of the present utility model, making The existing equipment can display the LED on and off according to the polarity of the surrounding magnetic field to realize the function of the electronic blackboard, and the scalability is stronger.

In order to achieve the above object, the utility model provides an electronic blackboard based on a bipolar Hall integrated circuit, which includes several LED monomers arranged to form an electronic blackboard, and the LED monomers include at least one LED chips and a bipolar Hall integrated circuit, the bipolar Hall integrated circuit is electrically connected to the at least one LED chip, the bipolar Hall integrated circuit senses the polarity of the surrounding magnetic field, and according to the The polarity of the magnetic field controls and keeps the LED monomer on and off.

Compared with the prior art, the utility model arranges and combines several LED monomers to form an electronic blackboard. The LED monomers include at least one LED chip for lighting and a bipolar Hall integrated circuit for controlling the LED chip to turn on and off. Corresponding N polarity magnets or S polarity magnets are used to control the on and off of LED monomers to realize writing and pattern display on the electronic blackboard. Even if several LED monomers are arranged, the corresponding polarity The proximity of the magnetic parts controls the lighting and extinguishing of several LED monomers to realize writing and pattern display on the electronic blackboard. For example, when the N pole magnetic magnet approaches, the LED monomer lights up, and when the S pole magnetic magnet approaches, the LED monomer turns off. ,vice versa. Furthermore, the electronic blackboard based on the bipolar Hall integrated circuit of the utility model has high display efficiency, simple structure, and low production cost, and at least one LED chip and the bipolar Hall integrated circuit are packaged into a single LED, which is more efficient. It is convenient to replace the LED monomer, it is easier to install and disassemble in the actual production operation, and the later maintenance cost is low. It can be refitted on the existing equipment to make the electronic blackboard based on the bipolar Hall integrated circuit of the present utility model. , so that the existing equipment can display the LED on and off according to the polarity of the surrounding magnetic field to realize the function of the electronic blackboard, and the scalability is stronger.

Preferably, the bipolar Hall integrated circuit includes a sensing module, a comparison module, at least one switching element corresponding to the at least one LED chip, and at least one latching module corresponding to the at least one switching element, so The induction module senses the polarity of the surrounding magnetic field to output a corresponding induction signal, and the two stages of the induction module are respectively electrically connected to the positive feedback terminal and the negative feedback terminal of the comparison module, and the comparison module outputs correspondingly according to the induction signal Induction level, the output end of the comparison module is electrically connected to the input end of the latch module, and the latch module maintains the induction level and sends the induction level to the control of the corresponding switching element terminal, the switch element is electrically connected to the corresponding LED chip and controls the LED chip to turn on and off.

Preferably, the bipolar Hall integrated circuit further includes a voltage stabilizing module, the input terminal of the voltage stabilizing module is electrically connected to an external power supply, and the output terminal of the voltage stabilizing module is electrically connected to the input terminal of the sensing module, And provide a regulated power supply to the input end of the sensing module.

Preferably, the output end of the switching element is electrically connected to the corresponding negative electrode of the LED chip.

Preferably, the bipolar Hall integrated circuit also includes a first enable control unit, the first enable control unit has a first enable terminal and is connected to all the bipolar Hall integrated circuits The latch module is electrically connected, and is controlled to allow or prohibit the latch module from latching the sensing level according to the signal input from the first enabling terminal.

Preferably, each of the bipolar Hall integrated circuits has at least two of the latch modules, and the bipolar Hall integrated circuits also include a second enable control unit, and the second enable control unit The unit has at least two second enabling terminals corresponding to the latch module in the bipolar Hall integrated circuit, and the output terminal of the second enabling control unit is integrated with the bipolar Hall The corresponding latch module in the circuit is electrically connected, and is controlled to allow or prohibit the latch module from latching the sensing level according to the signal input from each of the second enabling terminals.

Preferably, each of the latch modules corresponds to at least one LED chip, and the colors of the LED chips corresponding to at least two of the latch modules are different.

Preferably, the bipolar Hall integrated circuit further includes a control unit, the input terminal of the control unit is electrically connected to the comparison module, and the output terminal of the control unit is electrically connected to all the latch modules, so The control unit has at least two control terminals, and when the second enable terminal is in the enabled state, the at least two control terminals independently control the LED chip corresponding to the corresponding latch module to turn on and off, and the The control terminals independently control the corresponding latch modules to output high and low levels, and the control terminals of the same type of several LED monomers are electrically connected together.

Preferably, the anode of the LED chip is electrically connected to an external power supply through a resistor R.

Preferably, the LED monomer also includes a bracket, the LED chip and the bipolar Hall integrated circuit are installed in the bracket, and the bracket is formed to wrap the LED chip and the bipolar The cured encapsulation glue of the Hall integrated circuit and the power supply pin and the ground pin exposed outside the cured encapsulation glue, the power supply pin and the ground pin are respectively connected to the LED chip and the bipolar Hall The integrated circuit is electrically connected.

Preferably, a resistor R is further provided on the support, and the anode of the LED chip is electrically connected to the power supply pin through the resistor R. The resistor R is used to protect the LED chip from being damaged due to the excessive current flowing through the LED chip, and when the LED monomer is applied in a specific circuit, it can be very good without adding an additional protective resistor in the specific circuit. To protect the normal operation of the LED monomer, to prevent the LED monomer from being damaged due to the excessive current of the circuit where it is located.

Preferably, the bracket is further provided with at least two control pins exposed from the cured encapsulant, and the control pins are electrically connected to the corresponding control terminals.

Preferably, the electronic blackboard based on bipolar Hall integrated circuits also includes a panel, on which at least one installation groove is opened, on which a connecting line is laid, and the at least one LED monomer is installed on On the corresponding at least one installation slot, the LED monomer is electrically connected to the connection line.

Preferably, the bracket is further provided with grooves, the LED chip and the bipolar Hall integrated circuit are respectively installed in the grooves, and the cured packaging glue fills the grooves.

Preferably, the bracket is a substrate, the LED chip and the bipolar Hall integrated circuit are respectively installed in the substrate, and the encapsulation cured product wraps the substrate.

Correspondingly, the utility model also provides an electronic writing system, which includes an electronic pen, an electronic eraser, and an electronic blackboard based on a bipolar Hall integrated circuit as described above, and the electronic pen is provided with a unipolar Magnet, when the electronic pen is close to the LED monomer, the LED monomer senses the unipolar magnetic field of the electronic pen to control the LED monomer to light up, and the electronic pen eraser is provided with the The magnetic field of the electronic pen is a unipolar magnet with opposite polarity. When the electronic pen is close to the LED monomer, the LED monomer senses the unipolar magnetic field of the electronic pen to control the LED monomer to go out .

Preferably, the electronic pen eraser is arranged at the end of the electronic pen, the unipolar magnet of the electronic pen is arranged at the front end of the electronic pen, and the unipolar magnet of the electronic pen eraser is arranged at the The electronic pen wipes the position opposite to the electronic pen.

Description of drawings

FIG. 1 is a schematic structural diagram of an electronic blackboard based on a bipolar Hall integrated circuit of the present invention.

FIG. 2 is a schematic structural view of the LED monomer described in Embodiment 1 of the present invention.

Fig. 3 is a circuit diagram of the LED monomer described in Embodiment 1 of the present utility model.

FIG. 4 is a circuit diagram of the bipolar Hall integrated circuit of the LED monomer in FIG. 3 .

Fig. 5 is a structural schematic diagram of the LED monomer in another preferred manner in Embodiment 1 of the present utility model when it has a first enabling pin.

FIG. 6 is a circuit diagram of the bipolar Hall integrated circuit of the LED monomer in FIG. 5 .

FIG. 7 is a circuit diagram of the LED monomer shown in FIG. 5 .

FIG. 8 is a schematic structural view of the LED monomer in yet another preferred form of Embodiment 1 of the present utility model.

FIG. 9 is a schematic structural view of the LED monomer described in Embodiment 2 of the present utility model.

FIG. 10 is a circuit diagram of a single LED described in Embodiment 2 of the present utility model.

FIG. 11 is a circuit diagram of a bipolar Hall integrated circuit in the LED monomer shown in FIG. 10 .

Fig. 12 is a circuit diagram of another preferred mode in Fig. 10 .

FIG. 13 is a specific circuit diagram of FIG. 10 .

FIG. 14 is a schematic structural diagram of the electronic writing system of the present invention.

Detailed ways

Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements.

Embodiment one

Please refer to FIG. 1 , FIG. 2 and FIG. 3 , the electronic blackboard 1000 based on the bipolar Hall integrated circuit of this embodiment includes several LED monomers 100 arranged to form the electronic blackboard 1000 . The LED monomer 100 includes an LED chip 1 and a bipolar Hall integrated circuit 2 . Wherein, the bipolar Hall integrated circuit 2 senses the polarity of the surrounding magnetic field, and controls the LED chip 1 to turn on and off according to the polarity of the magnetic field. It should be noted that the bipolar Hall integrated circuit 2 can adopt other specific circuits capable of realizing the performance of the bipolar Hall integrated circuit 2 required by the utility model, so it is not limited here. The bipolar Hall integrated circuit 2 controls the on-off of the LED chip 1 according to the polarity of the magnetic field, which can be set according to actual needs, by connecting the N-pole of an object (not shown) with an N-pole magnetic field and/or an S-pole magnetic field Or S is very close to the bipolar Hall integrated circuit 2, such as when N is very close to the bipolar Hall integrated circuit 2, the bipolar Hall integrated circuit 2 controls the LED chip 1 to light up; when S is very close to When the bipolar Hall integrated circuit 2 is activated, the bipolar Hall integrated circuit 2 controls the LED chip 1 to turn off, and vice versa.

Please continue to refer to FIG. 1, FIG. 2 and FIG. 3. Preferably, several LED monomers 100 can be directly arranged and combined to form an electronic blackboard 1000, or several LED monomers 100 can be installed on a panel (not shown in the figure) To form the electronic blackboard 1000, the panel is preset with connection lines (not shown in the figure) and installation grooves, and the LED monomer 100 is installed in the installation grooves and electrically connected with the connection lines. Installing the LED monomer 100 directly on the installation groove of the panel can fix and conduct the LED monomer 100, which greatly facilitates the installation and maintenance of the LED monomer 100, and the connecting lines are laid according to the actual situation, and several LED monomers 100 can be directly The electrical connection is realized by connecting lines, and the electrical connection can be in series, parallel or mixed connection, wherein the mixed connection is to divide several LED monomers 100 into several groups, and the LED monomers 100 of each group are connected in series, and the connection between groups Parallel connection between them to realize hybrid connection.

Please refer to FIG. 3 and FIG. 4, the bipolar Hall integrated circuit 2 includes a sensing module 21, a comparison module 21, a latch module 21 and a switching element 24, the sensing module 21 senses N pole magnetic field or S pole magnetic field to Output the corresponding induction signal, and the two stages of the induction module 21 are electrically connected to the positive feedback end and the negative feedback end of the comparison module 22 respectively, and the comparison module 22 outputs the induction level correspondingly according to the induction signal (in this embodiment, the induction level corresponds to high level or low level), the output terminal of the comparison module 22 is electrically connected to the input terminal of the latch module 23, the latch module 23 maintains the sensing level and outputs the sensing level to the control terminal of the switching element 24, and the switching element 24 The LED chip 1 is electrically connected and the LED chip 1 is controlled to turn on and off.

Please refer to FIG. 6, the bipolar Hall integrated circuit 2 also includes a voltage stabilizing module 25, the input end of the voltage stabilizing module 25 is electrically connected to an external power supply (not shown in the figure), and the output end of the voltage stabilizing module 25 is electrically connected to the sensing module 21 and provide a regulated power supply to the input terminal of the sensing module 21, so as to ensure the stability of the working voltage of the bipolar Hall integrated circuit 2. The anode of the LED chip 1 is electrically connected to the input end of the voltage stabilizing module 25 , and the output end of the switch element 24 is electrically connected to the cathode of the LED chip 1 . It should be noted that the voltage stabilizing module 25 of the bipolar Hall integrated circuit 2 of the present invention is a voltage regulator, the comparison module 22 is a differential amplifier, the latch module 23 is a Schmitt trigger, and the switching element 24 is a For the output stage of the open collector, the utility model can also select other components and parts that can realize the functions of the voltage stabilizing module 25, the comparison module 22, the latch module 23 and the switch element 24 of the utility model respectively, so it is not considered as limit.

Please refer to FIG. 4, FIG. 6 and FIG. 7, the bipolar Hall integrated circuit 2 also includes a first enable control unit, the first enable control unit has a first enable terminal EN1 and is connected to the bipolar Hall integrated circuit The latch module 23 in 2 is electrically connected, and the latch module 23 is allowed or prohibited to latch the sensing level according to the signal input from the first enable terminal EN1. It is changed by the change of other signals, that is, at this time, the LED monomer only controls the on and off of each LED chip 1 according to the actual external level. Specifically, the latch module 23 also includes an enable terminal, and the enable terminal of the latch module 23 is used to allow or prohibit the latch module 23 from latching the level corresponding to the polarity of the magnetic field that controls the LED chip 1 to turn on or off. In this embodiment, the first enable terminal EN1 is the enable terminal of the latch module 23 .

Please refer to FIG. 7, the LED monomer 100 of the electronic blackboard 1000 based on the bipolar Hall integrated circuit of this embodiment also includes a resistor R, and the positive pole of the LED chip 1 is electrically connected to an external power supply through the resistor R, and the resistor R is used for protection. The LED chip 1 will not be damaged due to excessive current flowing through the LED chip 1 .

Please refer to FIG. 2 , the LED monomer 100 of the electronic blackboard 1000 based on the bipolar Hall integrated circuit of this embodiment further includes a bracket 3 . Specifically, the bracket 3 is preset with a connecting line (not shown in the figure), a power supply pin 5 and a ground pin 6, the LED chip 1 and the bipolar Hall integrated circuit 2 are installed in the bracket 3, the LED chip 1 and the bipolar The polar Hall integrated circuit 2 is electrically connected through the connection line on the bracket 3, and the power supply pin 5 and the ground pin 6 are electrically connected to the LED chip 1 and the bipolar Hall integrated circuit 2 respectively, wherein the voltage stabilizing module 25 The input terminal of is electrically connected to the power supply pin 5. A curing encapsulation 4 wrapping the LED chip 1 and the bipolar Hall integrated circuit 2 is formed on the bracket 3 , and the power supply pin 5 and the grounding pin 6 are exposed outside the cured encapsulation 4 . It should be noted that the cured encapsulant 4 has a light-transmitting structure, and the light-transmitting structure can be in different colors such as red, yellow, green, etc., and the specific color can be selected according to actual needs, so that the utility model can display different colors; The light-emitting structure can also be a colorless and transparent structure, and different light-emitting colors of the LED monomer 100 can be realized by selecting LED chips 1 with different light-emitting colors, so it is not limited here.

Please continue to refer to FIG. 5 and FIG. 6 , the bracket 3 is also provided with a first enable pin 7 exposed outside the cured package glue 4 , the first enable pin 7 is electrically connected to the enable end of the latch module 23 , That is, the first enable pin 7 is electrically connected to the first enable terminal EN1.

Please refer to Fig. 5 and Fig. 7, the resistor R is set on the bracket 3, the anode of the LED chip 1 is electrically connected to the power supply pin 5 through the resistor R, and the resistor R is used to protect the LED chip 1 from Excessive current can damage it.

Preferably, the bracket 3 is a substrate, the LED chip 1 and the bipolar Hall integrated circuit 2 are soldered and installed in the substrate respectively, and the cured encapsulation glue 4 wraps the substrate. Certainly, referring to FIG. 8 , in another preferred solution, grooves are also provided on the bracket 3 , and the LED chip 1 and the bipolar Hall integrated circuit 2 are installed in the grooves respectively, and the cured encapsulant 4 fills the grooves. , to further fix and protect the LED chip 1 and the bipolar Hall integrated circuit 2 .

Embodiment two

Please refer to FIG. 1 , FIG. 9 and FIG. 10 , the electronic blackboard 2000 based on the bipolar Hall integrated circuit of this embodiment includes several LED monomers 200 arranged to form the electronic blackboard 2000 . The LED monomer 200 includes three LED chips 1 and a bipolar Hall integrated circuit 2 . Wherein, the bipolar Hall integrated circuit 2 senses the polarity of the surrounding magnetic field, and controls the LED chip 1 to turn on and off according to the polarity of the magnetic field. It should be noted that the bipolar Hall integrated circuit 2 can use other specific circuits that can realize the performance of the bipolar Hall integrated circuit 2 required by the present invention, so it is not limited here. The bipolar Hall integrated circuit 2 controls the on-off of the LED chip 1 according to the polarity of the magnetic field, which can be set according to actual needs, by connecting the N-pole of an object (not shown) with an N-pole magnetic field and/or an S-pole magnetic field Or S is very close to the bipolar Hall integrated circuit 2, such as when N is very close to the bipolar Hall integrated circuit 2, the bipolar Hall integrated circuit 2 controls the LED chip 1 to light up; when S is very close to When the bipolar Hall integrated circuit 2 is activated, the bipolar Hall integrated circuit 2 controls the LED chip 1 to turn off, and vice versa.

Please refer to Fig. 1, Fig. 9 and Fig. 10. Preferably, several LED monomers 200 can be directly arranged and combined to form an electronic blackboard 2000. The panel is preset with connecting lines (not shown in the figure) and installation grooves, and the LED monomers 200 is installed on the installation groove and is electrically connected with the connection line. Installing the LED monomer 200 directly on the installation groove of the panel can fix and conduct the LED monomer 200, which greatly facilitates the installation and maintenance of the LED monomer 200, and the connecting lines are laid according to the actual situation, and several LED monomers 200 can be directly The electrical connection is realized by connecting lines, and the electrical connection can be in series, parallel or mixed connection, wherein the mixed connection is to divide several LED monomers 200 into several groups, and the LED monomers 200 of each group are connected in series, and the connection between groups Parallel connection between them to realize hybrid connection.

Please refer to FIG. 11 , the bipolar Hall integrated circuit 2 includes a sensing module 21, a comparison module 22, three latch modules 23 and three switching elements 24, and the sensing module 21 senses N pole magnetic field or S pole magnetic field to output Corresponding induction signal, the two stages of induction module 21 are respectively electrically connected to the positive feedback end and the negative feedback end of comparison module 22, and comparison module 22 outputs induction level correspondingly according to induction signal (in this embodiment, this induction level corresponds to high level or low level), the output terminals of the comparison module 22 are electrically connected to the input terminals of all latch modules 23, and the three latch modules 23 maintain the corresponding sensing levels and deliver the corresponding sensing levels to the corresponding switches At the control end of the element 24, the three switch elements 24 are respectively electrically connected to one LED chip 1 and control the corresponding LED chip 1 to turn on and off.

Please continue to refer to FIG. 11, the bipolar Hall integrated circuit 2 also includes a voltage stabilizing module 25, the input end of the voltage stabilizing module 25 is electrically connected to an external power supply, the output end of the voltage stabilizing module 25 is electrically connected to the input end of the sensing module 21, and A regulated power supply is provided to the input terminal of the sensing module 21 to ensure the stability of the working voltage of the bipolar Hall integrated circuit 2 . The anodes of the LED chips 1 are respectively electrically connected to the input terminals of the voltage stabilizing module 25 , and the output terminals of the three switching elements 24 are respectively electrically connected to the corresponding cathodes of the LED chips 1 to control the corresponding LED chips 1 to turn on and off. It should be noted that the voltage stabilizing module 25 of the bipolar Hall integrated circuit 2 of the present invention is a voltage regulator, the comparison module 22 is a differential amplifier, the latch module 23 is a Schmitt trigger, and the switching element 24 is a The output stage of open collector, the utility model can also choose other components and parts that can realize the function of voltage stabilizing module 25 of the utility model, comparison module 22, latch module 23 and switch element 24 respectively, so not here Think limit.

Please refer to FIG. 11-FIG. 13, the bipolar Hall integrated circuit 2 also includes a second enable control unit, the second enable control unit has a second enable terminal EN2 and is connected to all of the bipolar Hall integrated circuits 2 The latch module 23 is electrically connected, and the latch module 23 is allowed or prohibited to latch the induction level according to the signal input from the second enable terminal EN2. The LED chip 1 in this prohibited state is not affected by other The signal changes, that is, at this time, the LED monomer 200 only controls the on and off of each LED chip 1 according to the actual external level. Specifically, the latch module 23 also includes an enable terminal, and the enable terminal of the latch module 23 is used to allow or prohibit the latch module 23 from latching the level corresponding to the polarity of the magnetic field that controls the LED chip 1 to turn on or off.

Please continue to refer to FIG. 11 and FIG. 13, the bipolar Hall integrated circuit 2 of this embodiment also includes a control unit, the input terminal of the control unit is electrically connected to the comparison module 22, and the output terminal of the control unit is electrically connected to all the latch modules 23, The control unit has three control terminals CTR1, CTR2, and CTR3. When the second enable terminal EN2 is in the enabled state, the control terminals CTR1, CTR2, and CTR3 independently control the corresponding LED chip 1 of the latch module 23 to turn on and off. , the control terminals CTR1, CTR2, and CTR3 independently control the corresponding latch module 23 to output high and low levels, and the same type of different LED monomers 200 on the electronic blackboard 2000 based on bipolar Hall integrated circuits in this embodiment The control terminals CTR1, CTR2, and CTR3 are electrically connected together. Specifically, the control unit further includes three logic modules 26, and in this embodiment, the logic modules 26 are AND gate elements. One stage of all AND gate elements is electrically connected to the output terminal of the comparison module 22, and the other stage of all AND gate elements respectively leads to the control terminal and is electrically connected to the corresponding control terminal CTR1, CTR2, CTR3, and the output terminal of each AND gate element It is electrically connected to the input end of the corresponding latch module 23 . When the second enable terminal EN2 is in the allowed state, the latch module 23 latches and maintains the sensing level output by the comparison module 22, and independently controls each corresponding control terminal CTR1, CTR2, CTR3 by controlling the level of each The LED chip 1 is turned on and off. If the control terminals CTR1, CTR2, and CTR3 are at high level, the LED chips corresponding to the current control terminals CTR1, CTR2, and CTR3 will light up. If the control terminals CTR1, CTR2, and CTR3 are at low levels, then The LED chips 1 corresponding to the current control terminals CTR1, CTR2, and CTR3 are off, the control terminals CTR1 and CTR2 are at low level, and the control terminal CTR3 is at high level, then the LED chips 1 corresponding to the current control terminals CTR1 and CTR2 are off, and the current control terminal The LED chip 1 corresponding to CTR3 lights up, thereby realizing the independent control of the state of each LED chip 1; when the second enable terminal EN2 is in the prohibited state, the latch module 23 stops working, and the control terminals CTR1, CTR2, CTR3 The change of the level does not affect the corresponding LED chip 1 on and off. At this time, the LED monomer 200 will not change the on and off of the LED chip 1 due to the change of the magnetic field of the external environment, that is, the LED chip 1 in the prohibited state. On and off are not subject to changes in other signals. It is worth noting that the logic module 26 of this embodiment is an AND gate element. Of course, the logic module 26 can also be other types of logic modules 26 such as an OR gate element and a NAND element. In the case of the independent control of the state of the logic module 26, the selection of the logic module 26 can be selected according to the actual situation, so it is not limited here. It should be noted that the colors of the three LED chips 1 in this embodiment are different, and can be red, green and blue respectively, or other colors. Of course, the colors of the LED chips 1 can also be the same. By independently controlling the same color Turning on and off the LED chip 1 can realize the adjustability of the display brightness of the electronic blackboard 2000 of this embodiment, so it is not limited here. In addition, in addition to controlling the on and off of each LED chip 1 by the logic module 26, more display states of the electronic blackboard 2000 of this embodiment can be expanded by introducing a control module (not shown in the figure), such as various pulses Flashing, flashing of the breathing light, etc., such control modules are easily realized by those skilled in the art, so it is not limited here.

Please refer to FIG. 12 , the electronic blackboard 2000 based on the bipolar Hall integrated circuit of this embodiment also includes a resistor R, and the anodes of the three LED chips 1 are electrically connected to an external power supply through the resistor R, and the resistor R is used to protect the LED chip. 1 will not cause damage to the LED chip 1 due to excessive current flowing through it. It should be noted that, as another preferred embodiment, three resistors R are arranged on the support of the electronic blackboard 2000 based on the bipolar Hall integrated circuit of this embodiment, and the anode of each LED chip 1 can be independently connected in series with one resistor R Afterwards, they are electrically connected to the power supply pins, so it is not limited here.

Please refer to FIG. 9 , the LED monomer 200 of the electronic blackboard based on the bipolar Hall integrated circuit of this embodiment further includes a bracket 3 . Specifically, the bracket 3 is preset with a connecting line (not shown in the figure), a power supply pin 5 and a ground pin 6, the LED chip 1 and the bipolar Hall integrated circuit 2 are installed in the bracket 3, the LED chip 1 and the bipolar The polar Hall integrated circuit 2 is electrically connected through the connection line on the bracket 3, and the power supply pin 5 and the ground pin 6 are electrically connected to the LED chip 1 and the bipolar Hall integrated circuit 2 respectively, wherein the voltage stabilizing module 25 The input terminal of is electrically connected to the power supply pin 5. A curing encapsulation 4 wrapping the LED chip 1 and the bipolar Hall integrated circuit 2 is formed on the bracket 3 , and the power supply pin 5 and the grounding pin 6 are exposed outside the cured encapsulation 4 . It should be noted that the cured encapsulant 4 has a light-transmitting structure, and the light-transmitting structure can be in different colors such as red, yellow, green, etc., and the specific color can be selected according to actual needs, so that the utility model can display different colors; The light-emitting structure can also be a colorless and transparent structure, and different light-emitting colors of the LED monomer 200 can be realized by selecting LED chips 1 with different light-emitting colors, so it is not limited here.

Please continue to refer to FIG. 9 , the bracket 3 is also provided with a second enable pin 7 and three control pins 8 exposed outside the cured package glue 4, and the second enable pin 7 is electrically connected to the latch module 23. The enable terminal, that is, the second enable pin 7 is electrically connected to the second enable terminal EN2; the three control pins 8 are electrically connected to the corresponding control terminals CTR1, CTR2, and CTR3.

Please refer to Fig. 12, the resistor R is set on the bracket 3, and the anodes of the three LED chips 1 are electrically connected to the power supply pin through the resistor R. The resistor R is used to protect the LED chip 1 from the be too large and cause damage. It should be noted that, as yet another preferred embodiment, three resistors R are provided on the bracket 3, and the anode of each LED chip 1 can be independently connected in series with a resistor R to be electrically connected to the power supply pin, so it is not limited here.

Preferably, the bracket 3 is a substrate, the LED chip 1 and the bipolar Hall integrated circuit 2 are soldered and installed in the substrate respectively, and the cured encapsulation glue 4 wraps the substrate. Certainly, with reference to FIG. 8 , in another preferred solution, grooves are provided on the bracket 3, and the LED chip 1 and the bipolar Hall integrated circuit 2 are installed in the grooves respectively, and the cured encapsulation glue 4 fills the grooves, To further fix and protect the LED chip 1 and the bipolar Hall integrated circuit 2 .

It should be noted that the number of LED chips 2 in this embodiment is three, or two. In this case, there are two corresponding latch modules 33, switching elements 34 and logic modules 36. Of course, the number of LED chips The number can also be more than two other, and the corresponding latch module 33, switch element 34 and logic module 36 are all corresponding to it. In the specific implementation, the LED chip 2, the latch module 33, the switch element 34 and the logic module 36 The quantity can be selected according to the actual situation, so it is not limited here.

Specifically, the packaging steps of the LED monomer 100, 200 are as follows:

A bracket 3 is provided, and the bracket 3 is provided with a preset connection line, a power supply pin 5 and a ground pin 6;

Provide at least one LED chip 1 and a bipolar Hall integrated circuit 2, and install the LED chip 1 and the bipolar Hall integrated circuit 2 on the preset position of the bracket 3, so that the bipolar Hall integrated circuit 2 can pass through the connection The circuit is electrically connected to the LED chip 1, and the power supply pin 5 and the ground pin 6 are electrically connected to the LED chip 1 and the bipolar Hall integrated circuit 2 respectively through the connecting circuit;

Fill the encapsulation glue on the support 3, so that the encapsulation glue wraps the LED chip 1 and the bipolar Hall integrated circuit 2 and exposes the power supply pin 5 and the ground pin 6 outside the encapsulation glue, and the encapsulation glue is cured to form a cured encapsulation glue 4 .

Preferably, the bracket is also provided with a preset first enable pin 7/second enable pin 7, the first enable pin 7/second enable pin 7 are electrically connected to the connection line, the first enable pin 7/second enable pin 7 The first enabling pin 7/the second enabling pin 7 are exposed outside the packaging glue.

Preferably, at least two control pins 8 are preset on the bracket 3 , at least two control pins 8 are electrically connected to the connection lines, and at least two control pins 8 are exposed outside the packaging glue.

Correspondingly, please refer to Fig. 14, the utility model also provides an electronic writing system 3000, which includes an electronic pen 300, an electronic pen eraser 400, and the electronic blackboard 1000, 2000 based on bipolar Hall integrated circuits as above, electronic The pen 300 is provided with a unipolar magnet (not shown in the figure). When the electronic pen is close to the LED monomers 100 and 200, the LED monomers 100 and 200 will sense the unipolar magnetic field of the electronic pen 300 to control the LED monomers 100 and 200 to light up. The pen eraser 400 is provided with a unipolar magnet (not shown) opposite to the magnetic field polarity of the electronic pen 300. When the electronic pen eraser 400 is close to the LED monomer 100,200, the LED monomer 100,200 senses the single pole of the electronic pen eraser 400. Sexual magnetic field to control LED monomer 100,200 to extinguish.

Preferably, the electronic pen eraser 400 is arranged at the end of the electronic pen 300, the electronic pen eraser 400 is arranged at the end of the electronic pen 300, the unipolar magnet of the electronic pen 300 is arranged at the front end of the electronic pen 300, and the single pole of the electronic pen eraser 400 The polarized magnet is located on the electronic pen eraser 400 at a position opposite to the electronic pen 300 . Combining the electronic pen 300 and the electronic eraser 400 is more convenient for the user to perform writing operations, and can greatly reduce the probability of losing the electronic pen 300 and the electronic eraser 400 due to the carelessness of the user.

Preferably, the electronic pen 300 is also provided with a control button 9, and the control button 9 is wirelessly connected to all first enabling terminals EN1, or is connected to all second enabling terminals EN2 and all control terminals CTR1 and CTR2 respectively. , CTR3 wireless connection. The electronic writing system 3000 uses the control button 9 on the electronic pen 300 to wirelessly control the permission or prohibition of the latch module 23 to latch the sensing level and wirelessly control the on and off states of different types of LED chips 2 . Reasonably set the wireless connection mode between the control button 9 and the first enabling terminal EN1, or the second enabling terminal EN2 and the control terminals CTR1, CTR2, and CTR3, and quickly switch the working mode and LED of the electronic writing system 3000 through the control button 9. The display brightness of the monomers 100, 200 and the display colors of the LED monomers 100, 200 improve switching efficiency for users.

1-14, the utility model arranges and combines several LED monomers 100, 200 to form electronic blackboards 1000, 2000. The LED monomers 100, 200 include at least one LED chip 1 for lighting and bipolar for controlling the LED chip 1 to turn on and off. Hall integrated circuit 2 can use corresponding N polarity magnets or S polarity magnets to correspondingly control the brightness of LED monomers 100, 200 so as to realize writing and pattern display on electronic blackboards 1000, 2000, even When arranging several LED monomers 100, 200, it is also possible to control the brightness of several LED monomers 100, 200 by approaching the corresponding polarity magnets so as to realize writing and pattern display on the electronic blackboard 1000, 2000, for example, when the N pole The LED monomer 100,200 lights up when the magnetic magnet piece approaches, and the LED monomer 100,200 goes out when the S pole magnetic magnet piece approaches, and vice versa. Furthermore, the electronic blackboard 1000 and 2000 of the utility model based on bipolar Hall integrated circuits have high display efficiency, simple structure, and low production cost, and at least one LED chip 1 and bipolar Hall integrated circuits 2 are packaged into one The LED monomer 100,200 is more convenient to replace the LED monomer 100,200, and it is easier to install and disassemble in the actual production operation, and the later maintenance cost is low. It can be refitted on the existing equipment to make the utility model based on bipolar The electronic blackboard 1000, 2000 of the Hall integrated circuit enables the existing equipment to display the LED on and off according to the polarity of the surrounding magnetic field to realize the function of the electronic blackboard 1000, 2000, and has stronger expandability.

The utility model has been described above in conjunction with the best embodiments, but the utility model is not limited to the above-disclosed embodiments, but should cover various modifications and equivalent combinations based on the essence of the utility model.

Claims (10)

1. a kind of electronic blackboard based on bipolarity Hall integrated circuit, it is characterised in that including some LED monomers, Ruo Gansuo LED monomer arrangement form electronic blackboards are stated, the LED monomers include at least one LED chip and bipolarity Hall integrated circuit, The bipolarity Hall integrated circuit electrically connects with least one LED chip, the bipolarity Hall integrated circuit sensing The polarity of surrounding magnetic field, and Polarity Control according to the magnetic field and keep the light on and off of the LED monomers.

2. the electronic blackboard as claimed in claim 1 based on bipolarity Hall integrated circuit, it is characterised in that the bipolarity Hall integrated circuit includes induction module, comparison module, at least one switch element corresponding with least one LED chip And at least one latch module corresponding with least one switch element, the pole of the induction module sensing surrounding magnetic field Property to export corresponding induced signal, the two-stage of the induction module is electrically connected the positive feedback end of the comparison module and negative Feedback end, the comparison module are electrically connected according to the corresponding output sensing level of the induced signal, the output end of the comparison module The input of the latch module is connect, the latch module keeps the sensing level and is delivered to the sensing level correspondingly The switch element control terminal, the LED chip corresponding to switch element electrical connection simultaneously controls the LED chip Light on and off.

3. the electronic blackboard as claimed in claim 2 based on bipolarity Hall integrated circuit, it is characterised in that the bipolarity Hall integrated circuit also includes Voltage stabilizing module, and the input of the Voltage stabilizing module electrically connects external power source, the Voltage stabilizing module Output end electrically connects the input of the induction module, and provides a voltage-stabilized power supply to the input of the induction module.

4. the electronic blackboard as claimed in claim 2 based on bipolarity Hall integrated circuit, it is characterised in that the switch member The negative pole of the LED chip corresponding to the output end electrical connection of part.

5. the electronic blackboard as claimed in claim 2 based on bipolarity Hall integrated circuit, it is characterised in that the bipolarity Hall integrated circuit also includes the first enabled control unit, the described first enabled control unit have the first Enable Pin and with it is described All latch modules electrical connection in bipolarity Hall integrated circuit, the signal according to first Enable Pin input, which controls, to be allowed Or the latch module is forbidden to latch the sensing level.

6. the electronic blackboard as claimed in claim 5 based on bipolarity Hall integrated circuit, it is characterised in that each described double Polarity Hall integrated circuit has at least two latch modules, and it is enabled that the bipolarity Hall integrated circuit also includes second Control unit, the described second enabled control unit have the second Enable Pin and with it is all in the bipolarity Hall integrated circuit Latch module electrically connects, and the signal control according to second Enable Pin input allows or forbids the latch module to latch institute State sensing level.

7. the electronic blackboard as claimed in claim 6 based on bipolarity Hall integrated circuit, it is characterised in that each lock Storing module corresponds at least one LED chip, and each not phase of the LED chip color corresponding at least two latch modules Together, the positive pole of the LED chip electrically connects external power source by resistance R.

8. the electronic blackboard as claimed in claim 6 based on bipolarity Hall integrated circuit, it is characterised in that the bipolarity Hall integrated circuit also includes control unit, and the input of described control unit electrically connects the comparison module, and the control is single The output end of member electrically connects all latch modules, and described control unit has at least two control terminals, and described second makes When energy end is in permission state, the LED corresponding to the latch module corresponding at least two control terminals independent control The light on and off of chip, the latch module output low and high level corresponding to the control terminal independent control, and some LED monomers Same type of control terminal electrically connect jointly.

9. a kind of electronic writing system, it is characterised in that including any in electronic pen, electronic pen eraser and such as claim 6-8 The described electronic blackboard based on bipolarity Hall integrated circuit, unipolarity magnet, the electronics are provided with the electronic pen When pen is close to the LED monomers, the LED monomers sense the single pole magnetic field of the electronic pen to control the LED monomers point It is bright, the unipolarity magnet opposite with the polarity of the magnetic field of the electronic pen is provided with the electronic pen eraser, the electronic pen eraser leans on During the nearly LED monomers, the LED monomers sense the single pole magnetic field of the electronic pen eraser to control the LED monomers to extinguish.

10. electronic writing system as claimed in claim 9, it is characterised in that the electronic pen eraser is arranged at the electronic pen End, the unipolarity magnet of the electronic pen is located at the front end of the electronic pen, and the unipolarity magnet of the electronic pen eraser is set In being additionally provided with control button, the control on position opposite with the electronic pen on the electronic pen eraser, the electronic pen Button and all the first Enable Pin wireless connections, or respectively with all second Enable Pins and it is all described in Control terminal wireless connection.