Matrix lamp circuit and keyboard

Abstract

The utility model discloses a matrix lamp circuit and keyboard relates to input equipment technical field, wherein the matrix lamp circuit includes master control module, a plurality of light emitting subassembly, a plurality of switch circuit group, a plurality of second switch circuit and a plurality of bleeder circuit, the light emitting subassembly includes a plurality of LED lamp subassembly, the cathode of the plurality of LED lamp subassembly is all electrically connected with the master control module, and the bleeder circuit is electrically connected with the plurality of LED lamp subassembly. The switching circuit group comprises a plurality of first switching circuits, the input ends of the plurality of first switching circuits are electrically connected with the main control module, the controlled ends of the plurality of second switching circuits are electrically connected with the output ends of the plurality of first switching circuits one by one, and the input ends of the plurality of second switching circuits are connected to a power supply; the output end of each second switch circuit is electrically connected with the positive electrodes of the plurality of LED lamp assemblies of the corresponding light-emitting assembly, and each bleeder circuit is electrically connected with the positive electrodes of the plurality of LED lamp assemblies of the corresponding light-emitting assembly; the utility model aims to solve the problem that after any lamp of the keyboard is turned on, the lamps in the same row can emit low light.

Description

Technical Field

[0001] The utility model relates to the technical field of input devices, and particularly relates to a matrix lamp circuit and a keyboard. Background Art

[0002] A mechanical keyboard generally illuminates the keycaps by arranging LED lamp beads at the bottom of the keyboard, so as to improve the visibility of the keyboard.

[0003] A mechanical keyboard realizes key input through the cross connection of row lines and column lines, that is, when a key is pressed, the corresponding row line and column line will be conducted, thus forming a closed circuit to realize key recognition. When any key is pressed, the positive and negative electrodes of the corresponding LED lamp bead are conducted, and the charging current flows to the positive electrode of the LED lamp bead to make it emit light. At this time, the positive and negative electrodes of the LED lamp beads of the keys in the same row as this key are both conducted; when another key in the same row as the previous key is pressed again, since the LED lamp beads of the keys in the same row are all connected to the same line, the positive and negative electrodes of the LED lamp beads of the keys in the same row are also conducted, and the current of the LED lamp bead corresponding to the previously pressed key cannot be discharged completely in a short time, resulting in a faint light emitted by the LED lamp bead corresponding to the previously pressed key. This faint light phenomenon may interfere with the user's visual experience. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a matrix lamp circuit and a keyboard, aiming to solve the problem that when any LED lamp bead of the keyboard lights up, the lamp beads in the same row will emit faint light.

[0005] To achieve the above purpose, the matrix lamp circuit proposed by the utility model is applied to a keyboard. The matrix lamp circuit includes:

[0006] A main control module;

[0007] A plurality of light-emitting components, the light-emitting components include a plurality of LED lamp components, and the negative electrodes of the plurality of LED lamp components are all electrically connected to the main control module;

[0008] A plurality of switch circuit groups, the switch circuit groups include a plurality of first switch circuits, and the input ends of the plurality of first switch circuits are electrically connected to the main control module;

[0009] A plurality of second switch circuits, the controlled ends of the plurality of second switch circuits are electrically connected to the output ends of the plurality of first switch circuits one by one, the input ends of the plurality of second switch circuits are all connected to a power supply, and the output end of each second switch circuit is electrically connected to the positive electrodes of the plurality of LED lamp components of the corresponding light-emitting component;

[0010] Multiple discharge circuits, the input ends of each of the discharge circuits are electrically connected to the positive electrodes of multiple LED lamp assemblies of the corresponding light-emitting assembly, and the output ends of the multiple discharge circuits are all grounded.

[0011] In one embodiment, the first switch circuit includes:

[0012] A first diode and a key. The anode of the first diode is connected to a first power supply, the cathode of the first diode is electrically connected to one end of the key, and the other end of the key is electrically connected to the positive electrodes of the multiple LED lamp assemblies of the light-emitting assembly.

[0013] In one embodiment, the discharge circuit includes:

[0014] A first resistor. The first end of the first resistor is electrically connected to the positive electrodes of the multiple LED lamp assemblies of the light-emitting assembly, and the second end of the first resistor is grounded.

[0015] In one embodiment, the second switch circuit includes:

[0016] A second resistor and a first switching tube. The first end of the second resistor is electrically connected to the output end of the first switch circuit, the second end of the second resistor is electrically connected to the controlled end of the first switching tube, the input end of the first switching tube is connected to a power supply, and the output end of the first switching tube is electrically connected to the positive electrode of the light-emitting assembly.

[0017] In one embodiment, the first switching tube includes a PMOS tube.

[0018] In one embodiment, the matrix lamp circuit further includes:

[0019] Multiple voltage-regulator diodes D2. The cathodes of the multiple voltage-regulator diodes D2 are connected to the output ends of the multiple first switch circuits one by one, and the anodes of the multiple voltage-regulator diodes D2 are all grounded.

[0020] In one embodiment, the voltage-regulator diode D2 includes:

[0021] A transient suppression diode. The cathode of the transient suppression diode is connected to the input end of the first switch circuit one by one, and the anode of the transient suppression diode is grounded.

[0022] In one embodiment, the LED lamp assembly includes multiple LED lamps. The positive electrodes of the multiple LED lamps are all electrically connected to the output end of the second switch circuit, and the negative electrodes of the multiple LED lamps are electrically connected to the main control module.

[0023] The present utility model also provides a keyboard, which includes a main control module and the matrix lamp circuit described in any one of the above.

[0024] The technical solution of the present utility model includes a plurality of light-emitting components, a plurality of first switch circuits and a plurality of discharge circuits. The plurality of light-emitting components include a plurality of LED lamp components. The LED lamp components are light sources arranged under the keycaps. When any keycap is pressed, the corresponding first switch circuit is turned on, so that the main control module controls the second switch circuit to be turned on. The current of the power supply flows through the second switch circuit to the positive pole of the corresponding LED lamp component. When the key is released, the first switch circuit is turned off, and the second switch circuit is also turned off accordingly. The LED lamp component starts to discharge, and the discharged current is transmitted to the ground through the discharge circuit. In this way, in practical applications, when the user presses one of the keys, the corresponding LED lamp component lights up. When the user presses another key in the same row, the current discharged by the LED lamp component corresponding to the previous key has flowed to the ground through the discharge circuit and will not emit a weak light, effectively solving the phenomenon that the LED lights in the same row will emit a weak light when any LED lamp component lights up, and improving the accuracy and consistency of the keyboard backlight. Moreover, the matrix lamp circuit of the present utility model can also be used in various electronic displays, and this technology can be used to accurately control the LED lamp components of each pixel point. This can not only improve the clarity and accuracy of the display, but also reduce energy consumption and extend the service life of the device. It can also be applied to devices and systems that need to accurately indicate various states, such as medical devices, mechanical devices, electronic devices, etc. This technology can be used to accurately control the on and off of the indicator lights. This can ensure clear indication when needed, and at the same time avoid misjudgment or confusion caused by residual current. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0026] Figure 1 It is a schematic diagram of the module of an embodiment of the matrix lamp circuit and the keyboard provided by the present utility model;

[0027] Figure 2 It is a schematic diagram of the circuit structure of an embodiment of the matrix lamp circuit and the keyboard provided by the present utility model.

[0028] Explanation of the reference numerals in the drawings:

[0029] 10. Main control module; 20. Light-emitting component; 21. LED lamp component; 30. Switch circuit group; 31. First switch circuit; 40. Second switch circuit; 50. Discharge circuit.

[0030] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0034] Generally, a mechanical keyboard illuminates the keycaps by setting LED lamp beads at the bottom of the keyboard, thereby improving the visibility of the keyboard.

[0035] A mechanical keyboard realizes key input through the cross - connection of row lines and column lines. That is, when a key is pressed, the corresponding row line and column line will conduct, thus forming a closed circuit to realize key recognition. After any key is pressed, the positive and negative electrodes of the corresponding LED bead are conducted, and the charging current flows to the positive electrode of the LED bead to make it emit light. At this time, the positive and negative electrodes of the LED beads of the keys in the same row as this key are both conducted; when another key in the same row as the previous key is pressed again, since the LED beads of the keys in the same row are all connected to the same line, the positive and negative electrodes of the LED beads of the keys in the same row are also conducted, and the current of the LED bead corresponding to the previously pressed key cannot be discharged completely in a short time, resulting in the LED bead corresponding to the previously pressed key emitting a faint light. This faint - light phenomenon may interfere with the user's visual experience.

[0036] Therefore, the present utility model provides a matrix lamp circuit and a keyboard, aiming to solve the problem that after any LED bead of the keyboard lights up, the beads in the same row will emit faint light.

[0037] Reference Figure 1 , in an embodiment of the present utility model, a matrix lamp circuit is applied to a keyboard. The matrix lamp circuit includes:

[0038] A main control module 10;

[0039] Multiple light - emitting components 20, the light - emitting components 20 include multiple LED lamp components 21, and the negative electrodes of the multiple LED lamp components 21 are all electrically connected to the main control module 10;

[0040] Multiple switch circuit groups 30, the switch circuit groups 30 include multiple first switch circuits 31, and the input ends of the multiple first switch circuits 31 are electrically connected to the main control module 10;

[0041] Multiple second switch circuits 40, the controlled ends of the multiple second switch circuits 40 are electrically connected to the output ends of the multiple first switch circuits 31 one by one, the input ends of the multiple second switch circuits 40 are all connected to a power supply, and the output end of each second switch circuit 40 is electrically connected to the positive electrodes of the multiple LED lamp components 21 of the corresponding light - emitting component 20;

[0042] Multiple discharge circuits 50, the input end of each discharge circuit 50 is electrically connected to the positive electrodes of the multiple LED lamp components 21 of the corresponding light - emitting component 20, and the output ends of the multiple discharge circuits 50 are all grounded.

[0043] In this embodiment, the first switch circuit 31 can be a button. When the button is pressed, the main control module 10 outputs a corresponding control signal to the controlled end of the second switch circuit 40 to turn on the second switch circuit 40. The second switch circuit 40 can be implemented by using at least one switching tube, such as a MOS tube, an IGBT tube, a thyristor, a triode, a power tube, etc., and / or by using at least one switching device, such as a contactor, a circuit breaker, and a relay.

[0044] In this embodiment, when any one of the buttons is pressed, the main control module 10 turns on the positive and negative electrodes of the LED lamp assembly 21 in the same row as the button, and the corresponding LED lamp assembly 21 emits light when the positive electrode receives the current from the power supply.

[0045] In this embodiment, specifically, the technical solution of the present invention includes multiple light-emitting assemblies 20, multiple first switch circuits 31, and multiple discharge circuits 50. The multiple light-emitting assemblies 20 include multiple LED lamp assemblies 21. The LED lamp assembly 21 is a light source arranged under the keycap. When any one of the keycaps is pressed, the corresponding first switch circuit 31 is turned on, so that the main control module 10 controls the second switch circuit 40 to be turned on. The current of the power supply flows through the second switch circuit 40 to the positive electrode of the corresponding LED lamp assembly 21. When the button is released, the first switch circuit 31 is turned off, and the second switch circuit 40 is also turned off. The LED lamp assembly 21 starts to discharge, and the discharged current is transmitted to the ground through the discharge circuit 50. With such a setting, in practical applications, when the user presses one of the buttons, the corresponding LED lamp assembly 21 lights up. When the user presses another button in the same row as it, the current discharged by the LED lamp assembly 21 corresponding to the previous button has flowed to the ground through the discharge circuit 50 and will not emit a weak light, effectively solving the problem that the LED lights in the same row will emit a weak light when any one of the LED lamp assemblies 21 lights up, and improving the accuracy and consistency of the keyboard backlight; not only that, the matrix lamp circuit of the present invention can also be used in various electronic displays, and this technology can be used to precisely control the LED lamp assemblies 21 of each pixel point. This can not only improve the clarity and accuracy of the display, but also reduce energy consumption and extend the service life of the device. It can also be applied to devices and systems that need to precisely indicate various states, such as medical devices, mechanical devices, electronic devices, etc. This technology can be used to precisely control the on and off of the indicator lights. This can ensure clear indication when needed, and at the same time avoid misjudgment or confusion caused by residual current.

[0046] Reference Figure 2 , in an embodiment of the present invention, the first switch circuit 31 includes:

[0047] A first diode D1 and a key, the anode of the first diode D1 is connected to a first power supply, the cathode of the first diode D1 is electrically connected to one end of the key, and the other end of the key is electrically connected to the positive electrodes of the plurality of LED lamp assemblies 21 of the light-emitting assembly 20.

[0048] In this embodiment, the key is arranged below the keycap. When the user presses the keycap, the key is also pressed accordingly, so that the path between the main control module 10 and the second switch circuit 40 is turned on. The first diode D1 is used to prevent the current at the controlled end of the first switch tube from flowing back to the main control module 10, thereby effectively protecting the main control module 10 from potential damage.

[0049] Reference Figure 2 , in an embodiment of the present invention, the discharge circuit 50 includes:

[0050] A first resistor R1, the first end of the first resistor R1 is electrically connected to the positive electrodes of the plurality of LED lamp assemblies 21 of the light-emitting assembly 20, and the second end of the first resistor R1 is grounded.

[0051] In this embodiment, when any key is released, the current released from the positive electrode of the corresponding LED lamp assembly 21 will flow to the ground through the first resistor R1, avoiding the emission of a weak light caused by the discharge of the positive electrode of the previous LED lamp assembly 21 after pressing the key in the same row as it later.

[0052] Reference Figure 2 , in an embodiment of the present invention, the second switch circuit 40 includes:

[0053] A second resistor R2 and a first switch tube Q1, the first end of the second resistor R2 is electrically connected to the output end of the first switch circuit 31, the second end of the second resistor R2 is electrically connected to the controlled end of the first switch tube Q1, the input end of the first switch tube Q1 is connected to a power supply, and the output end of the first switch tube Q1 is electrically connected to the positive electrode of the light-emitting assembly 20.

[0054] In this embodiment, the first switch tube Q1 can be one of a triode, a MOS tube or an IGBT tube.

[0055] In this embodiment, the first switching transistor Q1 is a PMOS transistor. When the key is pressed, the first switching circuit 31 is turned on, and the main control module 10 outputs a low-level signal to the corresponding first switching transistor Q1 to turn on the first switching transistor Q1. The power supply flows through the first switching transistor Q1 to the corresponding light-emitting component 20, so that the corresponding LED lamp component 21 emits light. When the key is not pressed, the control end of the first switching transistor Q1 is connected to a high-level signal and is in an off state, cutting off the connection between the power supply and the LED lamp component 21. The second resistor R2 plays a role in current limiting to prevent the control end of the first switching transistor Q1 from being damaged when the current is too large.

[0056] In this embodiment, if the first switching transistor Q1 is a MOS transistor, when the MOS transistor is turned off, the current of its gate capacitance will not be discharged immediately, so the MOS transistor will not be completely turned off in a short time. If the turn-off time of the first switching transistor Q1 is slow, it will also cause part of the current of the power supply to still flow through the first switching transistor Q1 to the LED lamp component 21, resulting in unnecessary power loss. For this reason, the control end of the first switching transistor Q1 can also be connected to a fast release circuit. The fast release circuit can be composed of two resistors and a diode. The anode of the diode is electrically connected to the control end of the first switching transistor Q1, the cathode of the diode is electrically connected to one end of one of the resistors, one end of one of the resistors is connected to one end of the other resistor, and the other end of the other resistor is electrically connected to the control end of the first switching transistor Q1. When the first switching transistor Q1 is turned off, the current released by its gate capacitance will flow through the diode to the two resistors, and the resistors will quickly consume the released current in the form of converting electrical energy into heat energy. With such a setting, when the key is released, the first switching transistor Q1 can be completely turned off in a short time, thereby preventing part of the current of the power supply from flowing to the LED lamp component 21 and avoiding unnecessary power loss.

[0057] Reference Figure 2 , in an embodiment of the present invention, the matrix lamp circuit further includes:

[0058] A plurality of voltage stabilizing diodes D2, the cathodes of the plurality of voltage stabilizing diodes D2 are respectively connected to the output ends of the plurality of first switching circuits 31, and the anodes of the plurality of voltage stabilizing diodes D2 are all grounded.

[0059] In this embodiment, the voltage stabilizing diode D2 includes:

[0060] A transient suppression diode, the cathode of the transient suppression diode is respectively connected to the input end of the first switching circuit 31, and the anode of the transient suppression diode is grounded.

[0061] In this embodiment, static electricity is easily accumulated in the human body during daily life, especially in a dry environment. When the human body comes into contact with the keyboard, components such as the keys and keycaps of the keyboard may rub against other objects or fingers during use, generating static electricity. This static electricity may spread through the internal circuit of the keyboard. For example, it is released to the first switch circuit 31 through the keycap. The static electricity may directly interfere with the normal operation of the circuit. For example, when static electricity accumulates at the controlled end position of the second switch circuit 40, it may cause damage to the first switching transistor Q1. In this regard, the present utility model can adopt a voltage-regulating diode D2. When the static electricity at the controlled end of the second switch circuit 40 accumulates to a certain extent, its voltage will reach the conduction voltage of the voltage-regulating diode D2 to make the voltage-regulating diode D2 conduct, and the static electricity flows to the ground through the voltage-regulating diode D2. Further, the voltage-regulating diode D2 can adopt a transient voltage suppression diode. When a static electricity discharge event occurs, the transient voltage suppression diode will quickly change from a high-resistance state to a low-resistance state, providing a fast shunt path for the static electricity charge, thereby better avoiding damage to the second switch circuit 40 due to static electricity accumulation.

[0062] Reference Figure 2 , in an embodiment of the present utility model, the LED lamp assembly 21 includes a plurality of LED lamps. The positive electrodes of the plurality of LED lamps are electrically connected to the output end of the second switch circuit 40, and the negative electrodes of the plurality of LED lamps are electrically connected to the main control module 10.

[0063] In this embodiment, the plurality of LED lamps can adopt a variety of colors, such as green, red, or blue, etc. With such a setting, the user can, according to personalized needs, set the main control module 10 so that when a key is pressed, the main control module 10 conducts the positive and negative electrodes of at least one LED lamp to make at least one LED lamp emit light. This personalized customization not only enhances the user experience but also makes the keyboard more unique and personalized.

[0064] The present utility model also proposes a keyboard, which includes a main control module 10 and the matrix lamp circuit as described above.

[0065] It should be noted that since the keyboard of the present utility model is based on the above matrix lamp circuit, therefore, the embodiments of the keyboard of the present utility model include all the technical solutions of all the embodiments of the above matrix lamp circuit, and the achieved technical effects are also exactly the same, and will not be elaborated here.

[0066] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model. All equivalent structural transformations made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present utility model.

Claims

1. A matrix light circuit, applied to a keyboard, characterized in that: The matrix lamp circuit comprises: Main control module; A plurality of light-emitting components, wherein the light-emitting components include a plurality of LED lamp components, and the cathodes of the plurality of LED lamp components are electrically connected to the main control module; A plurality of switch circuit groups, wherein the switch circuit groups include a plurality of first switch circuits, and input ends of the plurality of first switch circuits are electrically connected to the main control module; A plurality of second switch circuits, wherein the controlled ends of the plurality of second switch circuits are electrically connected one by one to the output ends of the plurality of first switch circuits, the input ends of the plurality of second switch circuits are all connected to a power supply, and the output end of each second switch circuit is electrically connected to the positive electrodes of the plurality of LED lamp assemblies of the corresponding light-emitting assembly; A plurality of discharge circuits, the input end of each of the discharge circuits is electrically connected to the positive electrodes of the corresponding plurality of LED lamp components of the light-emitting component, and the output ends of the plurality of discharge circuits are grounded.

2. The matrix lamp circuit according to claim 1, characterized in that: The first switch circuit comprises: A first diode and a button, wherein the anode of the first diode is connected to a first power supply, the cathode of the first diode is electrically connected to one end of the button, and the other end of the button is electrically connected to the positive poles of the multiple LED lamp components of the light-emitting component.

3. The matrix lamp circuit according to claim 1, characterized in that: The discharge circuit comprises: A first resistor, wherein a first end of the first resistor is electrically connected to positive electrodes of the plurality of LED lamp assemblies of the light emitting assembly, and a second end of the first resistor is grounded.

4. The matrix lamp circuit according to claim 1, characterized in that: The second switch circuit comprises: A second resistor and a first switch tube, wherein the first end of the second resistor is electrically connected to the output end of the first switch circuit, the second end of the second resistor is electrically connected to the controlled end of the first switch tube, the input end of the first switch tube is connected to a power supply, and the output end of the first switch tube is electrically connected to the positive electrode of the light-emitting component.

5. The matrix lamp circuit according to claim 4, characterized in that: The first switch tube includes a PMOS tube.

6. The matrix lamp circuit according to any one of claims 1 to 3, characterized in that: The matrix lamp circuit further comprises: A plurality of zener diodes D2, cathodes of the plurality of zener diodes D2 are connected one by one to the output ends of the plurality of first switch circuits, and anodes of the plurality of zener diodes D2 are grounded.

7. The matrix lamp circuit according to claim 6, characterized in that: The voltage stabilizing diode D2 comprises: A transient suppression diode, wherein a cathode of the transient suppression diode is connected one-to-one with an input end of the first switch circuit, and an anode of the transient suppression diode is grounded.

8. The matrix lamp circuit according to claim 1, characterized in that: The LED lamp assembly includes a plurality of LED lamps, the positive electrodes of the plurality of LED lamps are electrically connected to the output end of the second switch circuit, and the negative electrodes of the plurality of LED lamps are electrically connected to the main control module.

9. A keyboard, characterized in that: The invention comprises a main control module and a matrix lamp circuit as claimed in any one of claims 1 to 8.

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