CN210327525U - Keyboard circuit - Google Patents
Keyboard circuit Download PDFInfo
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- CN210327525U CN210327525U CN201921420427.1U CN201921420427U CN210327525U CN 210327525 U CN210327525 U CN 210327525U CN 201921420427 U CN201921420427 U CN 201921420427U CN 210327525 U CN210327525 U CN 210327525U
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Abstract
The utility model discloses a keyboard circuit, include: a plurality of row lines, a plurality of column lines, and a detection circuit, wherein: the plurality of column lines are respectively coupled with the detection circuit; each row line comprises a public line and a plurality of key units, each key unit comprises a key unit line, one end of the public line is coupled with the detection circuit, and the other end of the public line is connected with the plurality of key unit lines at the junction; one end of each key unit circuit is connected with the public circuit at an intersection point, and the other end of each key unit circuit is connected with the corresponding row line; each key unit circuit comprises a key switch and a resistor, the key switches are closed when the corresponding key units are activated, and the resistors are connected with the key switches in series; and the detection circuit is used for sequentially applying high level to the plurality of column lines, detecting whether the voltage on the row line is higher than the standard voltage or not, and judging that the key exists on the corresponding row line to be activated if the voltage on the row line is higher than the standard voltage. By adopting the scheme, ghost keys can be avoided.
Description
Technical Field
The utility model relates to an electronic equipment field especially relates to a keyboard circuit.
Background
Nowadays, people use keyboards for a long time during their work and life, and thus the demand for keyboards is increasing.
Most of keyboard circuits adopted in the prior art are in a key matrix mode, and transmission lines corresponding to output ends in the keyboard circuits have intersection points, so that Ghost keys (Ghost keys) are easily caused.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims at providing a keyboard circuit avoids the emergence of ghost key condition.
The technical scheme is as follows: the embodiment of the utility model provides an in provide a keyboard circuit, include: a plurality of row lines, a plurality of column lines, and a detection circuit, wherein: the plurality of column lines are respectively coupled with the detection circuit; each row line comprises a public line and a plurality of key units, each key unit comprises a key unit line, one end of the public line is coupled with the detection circuit, and the other end of the public line is connected with the plurality of key unit lines at an intersection; one end of each key unit circuit is connected with the public circuit at an intersection point, and the other end of each key unit circuit is connected with the corresponding row line; each key unit circuit comprises a key switch and a resistor, the key switch is used for being closed when the corresponding key unit is activated, and the resistor is connected with the key switch in series; and the detection circuit is used for applying high level to the plurality of column lines in sequence, detecting whether the voltage on the row line is higher than a standard voltage or not, and judging that the key is activated on the corresponding row line if the voltage on the row line is higher than the standard voltage.
Specifically, the number of the key unit circuits in each row line is equal to the number of the column lines.
Specifically, the key unit further comprises a light unit, wherein the light unit comprises at least one light emitting diode or a plurality of light emitting diodes connected in parallel.
Specifically, the resistor in the key unit is embedded in the light unit.
Specifically, the detection circuit includes a control chip, the plurality of column lines are respectively connected to the control chip, and the plurality of column lines are respectively connected to the control chip: and the control chip is used for applying high level to the plurality of column lines in sequence, detecting whether the voltage on the row line is higher than a standard voltage, and judging that the key is activated on the corresponding row line if the voltage on the row line is higher than the standard voltage.
Specifically, the detection circuit comprises a plurality of selector switches, a comparison circuit and a processor, each row line is connected with the selector switch, the selector switches are connected with the comparison circuit, the comparison circuit is connected with the processor, the plurality of column lines are connected with the processor, and the processor applies high level to the plurality of column lines in sequence; the switching switch is used for sequentially conducting each row line with the comparison circuit through alternate closing and opening, the comparison circuit is used for detecting whether the voltage on the conducted row line is higher than a standard voltage, if the voltage on the detected row line is higher than the standard voltage, a corresponding signal is output to the processor, and the processor judges that a key exists on the corresponding row line and is activated.
The embodiment of the utility model provides an in still provide a keyboard circuit, include: a plurality of row lines, a plurality of column lines, and a detection circuit, wherein: the plurality of column lines are respectively coupled with the detection circuit; each row line comprises a public line and a plurality of key units, each key unit comprises a key unit line, one end of the public line is coupled with the detection circuit, and the other end of the public line is connected with the plurality of key unit lines at an intersection; one end of each key unit circuit is connected with the public circuit at an intersection point, and the other end of each key unit circuit is connected with the corresponding row line; each key unit circuit comprises a key switch and a diode, the key switch is used for being closed when the corresponding key unit is activated, the diode is connected with the key switch in series, the anode of the diode is connected with the key switch, and the cathode of the diode is connected with a public circuit at an intersection point; and the detection circuit is used for applying high level to the plurality of column lines in sequence, detecting whether the voltage on the row line is higher than a standard voltage or not, and judging that the key is activated on the corresponding row line if the voltage on the row line is higher than the standard voltage.
Specifically, the key unit further comprises a light unit, wherein the light unit comprises at least one light emitting diode or a plurality of light emitting diodes connected in parallel.
Specifically, the diode in the key unit is embedded in the light unit.
The embodiment of the utility model provides an in still provide a keyboard circuit, include: a plurality of row lines, a plurality of column lines, and a detection circuit, wherein: the plurality of column lines are respectively coupled with the detection circuit; each row line comprises a public line and a plurality of key units, each key unit comprises a key unit line, one end of the public line is coupled with the detection circuit, and the other end of the public line is connected with the plurality of key unit lines at an intersection; one end of each key unit circuit is connected with the public circuit at an intersection point, and the other end of each key unit circuit is connected with the corresponding row line; each key unit circuit comprises a key switch and a capacitor, the key switches are closed when the corresponding key units are activated, and the capacitors are connected in series with the key switches; and the detection circuit is used for applying high level to the plurality of column lines in sequence, detecting whether the charge quantity on the row line is higher than the standard charge quantity, and judging that the key is activated on the corresponding row line if the charge quantity on the row line is higher than the standard charge quantity.
Has the advantages that: compared with the prior art, the utility model has the advantages of it is as follows showing: judging whether the key unit is activated on the corresponding row line or not according to the voltage distributed by the resistor in the activated key unit; or the flow direction of the current is guided through the characteristics of the diode, so that the keyboard circuit which has simple structure and low manufacturing cost and can avoid the ghost key condition is realized.
Drawings
Fig. 1 is a schematic structural diagram of a keyboard circuit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another keyboard circuit provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a key unit portion based on the keyboard circuit in fig. 1 and fig. 2 according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another keyboard circuit provided in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a key unit portion based on the keyboard circuit in fig. 4 according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a single led keyboard circuit provided in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a key unit portion based on the keyboard circuit in fig. 6 according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another single led keyboard circuit provided in an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a key unit portion based on the keyboard circuit in fig. 8 according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a capacitor key unit provided in an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, it is a schematic structural diagram of a keyboard circuit provided in an embodiment of the present invention, which specifically includes: a plurality of row lines, a plurality of column lines, and a detection circuit, wherein: the plurality of column lines are respectively coupled with the detection circuit; each row line comprises a public line and a plurality of key units U, each key unit U comprises a key unit line L, one end of the public line is coupled with the detection circuit, and the other end of the public line is connected with the plurality of key unit lines L at an intersection; one end of each key unit line L is connected with the public line at an intersection point, and the other end of each key unit line L is connected with the corresponding row line; each key unit circuit L comprises a key switch I and a resistor R, the key switch I is used for being closed when the corresponding key unit U is activated, and the resistor R is connected with the key switch I in series; and the detection circuit is used for applying high level to the plurality of column lines in sequence, detecting whether the voltage on the row line is higher than a standard voltage or not, and judging that the key is activated on the corresponding row line if the voltage on the row line is higher than the standard voltage.
In the embodiment of the utility model provides an in, the quantity of the key unit circuit L in every rowline equals with the quantity of alignment.
In a specific implementation, each key unit circuit L in each row line is connected with a corresponding row line; each row line can be connected with the row line through the corresponding key unit line L in each row line respectively, so that each row line is connected with all the row lines in the keyboard circuit.
In a specific implementation, when a key unit U is activated, i.e. a key is effectively pressed, the key switch I in the corresponding key unit U is closed, and the key unit line L may be turned on.
In a specific implementation, the junction refers to a connection point between a common line in a row line and each of the key unit lines L, and although specific connection positions between the common line and each of the key unit lines L are different, each connection position may be equivalent to one point, i.e., the junction.
In a specific implementation, the detection circuit may apply a high-level voltage to the column lines in sequence of column line 00 and column line 01, when the detection circuit applies a high-level voltage to the column line 00, if the corresponding Q key unit on the column line 00 is effectively pressed, the key switch I is closed, the column line 00 is conducted with the column line 00 at this time, the voltage on the column line 00 detected by the detection circuit is divided by the resistor R corresponding to the Q key unit and is actually close to the high-level voltage applied by the detection circuit to the column line 00, the high-level voltage is higher than the standard voltage, therefore, the detection circuit can determine that there is a key activated on the corresponding row line 00, and at this time, the detection circuit applies a high-level voltage to the column line 00, the key unit U corresponding to the intersection of the column line 00 and the row line 00 is a Q key unit, and finally it can be determined that the Q key unit is activated, that is, the Q key is effectively pressed.
In a specific implementation, when the detection circuit applies a high-level voltage to the column line 00, if the key unit Q and the key unit a corresponding to the column line 00 are simultaneously and effectively pressed, the corresponding key switch I is closed, and at this time, the column line 00 is conducted with the column line 00 and the column line 01, because the key unit line L corresponding to the key unit Q is connected in parallel with the key unit line L corresponding to the key unit a, the detection circuit detects the voltages on the column line 00 and the column line 01, which are actually close high-level voltages respectively obtained by dividing the resistance R corresponding to the Q key unit, the resistance R corresponding to the a key unit is divided into actually close high-level voltages, and the high-level voltage is higher than the standard voltage, so that the detection circuit can determine that a key exists on the corresponding column line 00 and the column line 01 and is activated, and at this time, the detection circuit applies a high-level voltage to the column line 00, the key unit U corresponding to the intersection of the column line 00 and the column line 00 is a Q key, the key unit U corresponding to the intersection of column line 00 and row line 01 is a key unit a, and it can be finally determined that Q key unit and a key unit a are activated.
In a specific implementation, when the Q key unit, the W key unit, and the S key unit are effectively pressed at the same time, according to a key matrix manner adopted by a keyboard circuit in the prior art, when a high-level voltage is applied to the column line 00 by the detection circuit, the row line 01 can detect that a key is effectively pressed, the key unit U corresponding to the intersection of the column line 00 and the row line 01 is an a key unit, and the a key unit is erroneously determined to be effectively pressed, so that a ghost key condition occurs.
In a specific implementation, when the Q key unit, the W key unit, and the S key unit are simultaneously and effectively pressed, the detection circuit applies a high level voltage to the column line 00, and the voltage on the row line 00 is higher than the standard voltage, so that the detection circuit can determine that the Q key unit is effectively pressed, but since the current flows through the Q key unit line L, W and the S key unit line L, the current flows to the detection circuit, that is, the resistors R corresponding to the three key units of the Q key unit, the W key unit, and the S key unit are voltage-distributed, the voltage on the resistor R corresponding to the S key unit will become smaller and smaller than the standard voltage, at this time, the detection circuit can determine that no key on the row line 01 is effectively pressed, and then the detection circuit applies a high level voltage to the column line 01, the detection circuit can detect that the voltages of the row line 00 and the row line 01 are higher than the standard voltage, the detection circuit can judge that the key unit U is effectively pressed on the row line 00 and the row line 01, further confirm that the W key unit and the S key unit are effectively pressed, and finally confirm that the Q key unit, the W key unit and the S key unit are effectively pressed, and can not mistakenly judge that the A key unit is also effectively pressed. Adopt the embodiment of the utility model provides an in the keyboard circuit that provides, can effectually avoid the emergence of ghost key condition, the frequency that detects the circuit and apply high level voltage to the column line in proper order can be very high moreover, and voltage detection speed on the column rule can be very fast, therefore keyboard circuit can be high-efficient, sensitive, need not to add in keyboard circuit simultaneously and establishes too much circuit components and parts, can reduce keyboard circuit's manufacturing cost.
In a specific implementation, the standard voltage is lower than the high-level voltage applied by the detection circuit and higher than the voltage divided by the plurality of key units U, and the standard voltage is required to conform to the above principle related to key press detection, and may be set by a user according to an actual application scenario.
In the embodiment of the utility model provides an in, the button unit U still includes light unit P, light unit P includes at least one emitting diode D, or a plurality of emitting diode D that connect in parallel each other.
In the embodiment of the utility model provides an in, inside resistance R among the key unit U imbedded in light unit P, light unit P wholly forms the backlight.
In a specific implementation, each key unit U may correspond to a light unit P, the light unit P is used to form a backlight to achieve a keyboard light effect, and the light unit P may use an independent driving power supply (not shown in the figure).
In specific implementation, the resistor R corresponding to the key unit U is within the physical range of the light unit P, the resistor R is embedded in the light unit P, the light unit P integrally forms a backlight, and the resistor R is embedded in the backlight, so that the backlight including the resistor R can have the characteristic of the resistor R, and can be used for realizing the voltage distribution effect, thereby avoiding the occurrence of ghost key conditions. For the printing carbon film formula resistance that keyboard circuit adopted among the prior art, the resistance is more stable, and the precision is higher, and the yield is high, very big promotion the sensitivity of keyboard button, optimized user experience, be the embodiment of the utility model provides an in one of the important improvement that provides.
In an embodiment of the utility model, the detection circuitry includes control chip, many alignment respectively with control chip connects: and the control chip is used for applying high level to the plurality of column lines in sequence, detecting whether the voltage on the row line is higher than a standard voltage, and judging that the key is activated on the corresponding row line if the voltage on the row line is higher than the standard voltage.
In specific implementation, the control chip can realize the corresponding functions of the detection circuit by storing a preset calculation program.
Fig. 2 is a schematic structural diagram of another keyboard circuit according to an embodiment of the present invention.
In the embodiment of the present invention, the detection circuit includes a plurality of switches, a comparison circuit and a processor, each row line is connected to the switch, the switch is connected to the comparison circuit, the comparison circuit is connected to the processor, the plurality of column lines are connected to the processor, and the processor sequentially applies a high level to the plurality of column lines; the switching switch is used for sequentially conducting each row line with the comparison circuit through alternate closing and opening, the comparison circuit is used for detecting whether the voltage on the conducted row line is higher than a standard voltage, if the voltage on the detected row line is higher than the standard voltage, a corresponding signal is output to the processor, and the processor judges that a key exists on the corresponding row line and is activated.
In specific implementation, the selector switch can be switched rapidly in turn, so that each row line can be conducted with the comparison circuit in turn, the row line conducted with the comparison circuit is connected with the input end of the comparison circuit, the first input end of the comparison circuit detects the voltage on the row line conducted with the comparison circuit, the second input end of the comparison circuit is connected with the standard voltage, the comparison circuit can compare the voltage on the row line conducted with the comparison circuit with the standard voltage, if the standard voltage is larger, the output end of the comparison circuit outputs a corresponding signal to the processor, and the processor can judge that no key unit U is effectively pressed on the corresponding row line; if the voltage on the corresponding row line is larger, the output end of the comparison circuit outputs a corresponding signal to the processor, and the processor can judge that the key unit U on the corresponding row line is effectively pressed, so that the ghost key condition can be effectively avoided.
Fig. 3 is a schematic structural diagram of a portion of a key unit U based on the keyboard circuit in fig. 1 and 2 according to an embodiment of the present invention.
In one embodiment, a plurality of row lines and a plurality of column lines intersect to form a structure of a key unit U portion of the keypad circuit.
Fig. 4 is a schematic structural diagram of another keyboard circuit provided in an embodiment of the present invention.
In an embodiment of the utility model, still provide a keyboard circuit, include: a plurality of row lines, a plurality of column lines, and a detection circuit, wherein: the plurality of column lines are respectively coupled with the detection circuit; each row line comprises a public line and a plurality of key units U, each key unit U comprises a key unit line L, one end of the public line is coupled with the detection circuit, and the other end of the public line is connected with the plurality of key unit lines L at an intersection; one end of each key unit line L is connected with the public line at an intersection point, and the other end of each key unit line L is connected with the corresponding row line; each key unit circuit L comprises a key switch I and a diode F, the key switch I is used for being closed when the corresponding key unit is activated, the diode F is connected with the key switch I in series, the anode of the diode F is connected with the key switch I, and the cathode of the diode F is connected with a public circuit at an intersection point; and the detection circuit is used for applying high level to the plurality of column lines in sequence, detecting whether the voltage on the row line is higher than a standard voltage or not, and judging that the key is activated on the corresponding row line if the voltage on the row line is higher than the standard voltage.
In a specific implementation, a detection circuit applies a high-level voltage to a column line 00, a Q key unit is effectively pressed, a corresponding key switch I is closed, at this time, due to the forward conduction characteristic of a diode F, the column line 00 is conducted with the column line 00, the detection circuit detects the obtained voltage on the column line 00, the high-level voltage is higher than a standard voltage in order to be actually close to the high-level voltage applied to the column line 00 by the detection circuit, therefore, the detection circuit can determine that a key exists on the corresponding column line 00 and is activated, at this time, the detection circuit applies the high-level voltage to the column line 00, a key unit U corresponding to the intersection of the column line 00 and the column line 00 is a Q key unit, and finally, it can be determined that the Q key unit is activated, that the Q key is effectively.
In the embodiment of the utility model provides an in, the quantity of the key unit circuit L in every rowline equals with the quantity of alignment.
In a specific implementation, each key unit circuit L in each row line is connected with a corresponding row line; each row line can be connected with the row line through the corresponding key unit line L in each row line respectively, so that each row line is connected with all the row lines in the keyboard circuit.
In a specific implementation, when the Q key unit, the W key unit, and the S key unit are simultaneously and effectively pressed, the detection circuit applies a high level voltage to the column line 00, and the voltage on the row line 00 is higher than the standard voltage, so that the detection circuit can determine that the Q key unit is effectively pressed, due to the forward conduction characteristic of the diode F, the diode F on the W key unit line L blocks the flow of current, the current is difficult to flow to the detection circuit through the Q key unit line L, W key unit line L, S key unit line L and the row line 01, at this time, since the voltage on the row line 01 is almost 0 and is lower than the standard voltage, the detection circuit can determine that no key is effectively pressed on the row line 01, and then the detection circuit applies a high level voltage to the column line 01, and the detection circuit can detect that the voltages on the row lines 00 and 01 are higher than the standard voltage, the detection circuit can judge that the key unit U on the row lines 00 and 01 is effectively pressed, further confirm that the key units W and S are effectively pressed, and finally confirm that the key units Q, W and S are effectively pressed, and can not judge that the key unit A is also effectively pressed by mistake. Adopt the embodiment of the utility model provides an in the keyboard circuit that provides, can effectually avoid the emergence of ghost key condition, the frequency that detects the circuit and apply high level voltage to the column line in proper order can be very high moreover, and voltage detection speed on the column rule can be very fast, therefore keyboard circuit can be high-efficient, sensitive, need not to add in keyboard circuit simultaneously and establishes too much circuit components and parts, can reduce keyboard circuit's manufacturing cost.
Fig. 5 is a schematic structural diagram of a portion of a key unit U based on the keyboard circuit in fig. 4 according to an embodiment of the present invention.
In one embodiment, a plurality of row lines and a plurality of column lines intersect to form a structure of a key unit U portion of the keypad circuit.
In the embodiment of the utility model provides an in, the button unit U still includes light unit P, light unit P includes at least one emitting diode D, or a plurality of emitting diode D that connect in parallel each other.
In the embodiment of the utility model provides an in, inside diode F among the key unit U imbedded light unit P, light unit P wholly forms the backlight.
In a specific implementation, each key unit U may correspond to a light unit P, the light unit P is used to form a backlight to achieve a keyboard light effect, and the light unit P may use an independent driving power supply (not shown in the figure).
In specific implementation, the diode F corresponding to the key unit U is located within the physical range of the light unit P, the diode F is embedded inside the light unit P, and the light unit P integrally forms a backlight. For the printing carbon film formula resistance R that the keyboard circuit adopted among the prior art, programming is simpler, realizes easily, and the yield is high, very big promotion the sensitivity of keyboard button, optimized user experience, be the embodiment of the utility model provides an in one of the important improvement that provides.
Referring to fig. 6, it is a schematic structural diagram of a single led keyboard circuit provided in an embodiment of the present invention, wherein a single led D is embedded in the lighting unit P, and a corresponding resistor R is embedded in the lighting unit P.
Fig. 7 is a schematic structural diagram of a key unit based on the keyboard circuit in fig. 6 according to an embodiment of the present invention.
Referring to fig. 8, it is a schematic structural diagram of another single led keyboard circuit according to an embodiment of the present invention, wherein a single led D and a corresponding diode F are embedded in the light unit P.
Fig. 9 is a schematic structural diagram of a key unit portion based on the keyboard circuit in fig. 8 according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a capacitor key unit portion according to an embodiment of the present invention.
In an embodiment of the utility model, still provide a keyboard circuit, include: a plurality of row lines, a plurality of column lines, and a detection circuit, wherein: the plurality of column lines are respectively coupled with the detection circuit; each row line comprises a public line and a plurality of key units, each key unit comprises a key unit line, one end of the public line is coupled with the detection circuit, and the other end of the public line is connected with the plurality of key unit lines at an intersection; one end of each key unit circuit is connected with the public circuit at an intersection point, and the other end of each key unit circuit is connected with the corresponding row line; each key unit circuit comprises a key switch and a capacitor C, the key switches are closed when the corresponding key units are activated, and the capacitors C are connected with the key switches in series; and the detection circuit is used for applying high level to the plurality of column lines in sequence, detecting whether the charge quantity on the row line is higher than the standard charge quantity, and judging that the key is activated on the corresponding row line if the charge quantity on the row line is higher than the standard charge quantity.
The embodiment of the utility model provides an in, the button unit still includes the light unit, the light unit includes at least one emitting diode, or a plurality of emitting diode that connect in parallel each other.
In the embodiment of the utility model provides an in, electric capacity C among the key unit is embedded into inside the light unit.
In a specific implementation, the capacitance of the capacitor C is fixed, when a high level voltage is applied to the capacitor, the charge amount on the capacitor increases, the detection circuit can determine whether the key unit is activated or pressed on the corresponding row line by detecting whether the value of the charge amount is higher than the standard charge amount, and reference may be made to the other embodiments for the functions, functions and advantageous effects of the components in this embodiment.
Claims (10)
1. A keyboard circuit, comprising: a plurality of row lines, a plurality of column lines, and a detection circuit, wherein:
the plurality of column lines are respectively coupled with the detection circuit;
each row line comprises a public line and a plurality of key units, each key unit comprises a key unit line, one end of the public line is coupled with the detection circuit, and the other end of the public line is connected with the plurality of key unit lines at an intersection; one end of each key unit circuit is connected with the public circuit at an intersection point, and the other end of each key unit circuit is connected with the corresponding row line;
each key unit circuit comprises a key switch and a resistor, the key switch is used for being closed when the corresponding key unit is activated, and the resistor is connected with the key switch in series;
and the detection circuit is used for applying high level to the plurality of column lines in sequence, detecting whether the voltage on the row line is higher than a standard voltage or not, and judging that the key is activated on the corresponding row line if the voltage on the row line is higher than the standard voltage.
2. The keyboard circuit of claim 1, wherein the number of key cell lines in each row line is equal to the number of column lines.
3. A keyboard circuit according to claim 1, wherein the key unit further comprises a light unit comprising at least one light emitting diode, or a plurality of light emitting diodes connected in parallel with each other.
4. A keyboard circuit according to claim 3, wherein the resistors in the key units are embedded within the light units.
5. The keyboard circuit of claim 1, wherein the detection circuit comprises a control chip, the plurality of column lines are respectively connected with the control chip, and the plurality of column lines are respectively connected with the control chip: and the control chip is used for applying high level to the plurality of column lines in sequence, detecting whether the voltage on the row line is higher than a standard voltage, and judging that the key is activated on the corresponding row line if the voltage on the row line is higher than the standard voltage.
6. The keyboard circuit of claim 1, wherein the detection circuit comprises a plurality of switches, a comparison circuit and a processor, each row line is connected to a respective switch, a respective switch is connected to the comparison circuit, the comparison circuit is connected to the processor, the plurality of column lines are connected to the processor, and the processor sequentially applies a high level to the plurality of column lines; the switching switch is used for sequentially conducting each row line with the comparison circuit through alternate closing and opening, the comparison circuit is used for detecting whether the voltage on the conducted row line is higher than a standard voltage, if the voltage on the detected row line is higher than the standard voltage, a corresponding signal is output to the processor, and the processor judges that a key exists on the corresponding row line and is activated.
7. A keyboard circuit, comprising: a plurality of row lines, a plurality of column lines, and a detection circuit, wherein:
the plurality of column lines are respectively coupled with the detection circuit;
each row line comprises a public line and a plurality of key units, each key unit comprises a key unit line, one end of the public line is coupled with the detection circuit, and the other end of the public line is connected with the plurality of key unit lines at an intersection; one end of each key unit circuit is connected with the public circuit at an intersection point, and the other end of each key unit circuit is connected with the corresponding row line;
each key unit circuit comprises a key switch and a diode, the key switch is used for being closed when the corresponding key unit is activated, the diode is connected with the key switch in series, the anode of the diode is connected with the key switch, and the cathode of the diode is connected with a public circuit at an intersection point;
and the detection circuit is used for applying high level to the plurality of column lines in sequence, detecting whether the voltage on the row line is higher than a standard voltage or not, and judging that the key is activated on the corresponding row line if the voltage on the row line is higher than the standard voltage.
8. A keyboard circuit according to claim 7, wherein the key unit further comprises a light unit comprising at least one light emitting diode, or a plurality of light emitting diodes connected in parallel with each other.
9. A keyboard circuit according to claim 8, wherein the diodes in the key units are embedded within the light units.
10. A keyboard circuit, comprising: a plurality of row lines, a plurality of column lines, and a detection circuit, wherein:
the plurality of column lines are respectively coupled with the detection circuit;
each row line comprises a public line and a plurality of key units, each key unit comprises a key unit line, one end of the public line is coupled with the detection circuit, and the other end of the public line is connected with the plurality of key unit lines at an intersection; one end of each key unit circuit is connected with the public circuit at an intersection point, and the other end of each key unit circuit is connected with the corresponding row line;
each key unit circuit comprises a key switch and a capacitor, the key switches are closed when the corresponding key units are activated, and the capacitors are connected in series with the key switches;
and the detection circuit is used for applying high level to the plurality of column lines in sequence, detecting whether the charge quantity on the row line is higher than the standard charge quantity, and judging that the key is activated on the corresponding row line if the charge quantity on the row line is higher than the standard charge quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921420427.1U CN210327525U (en) | 2019-08-29 | 2019-08-29 | Keyboard circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921420427.1U CN210327525U (en) | 2019-08-29 | 2019-08-29 | Keyboard circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210327525U true CN210327525U (en) | 2020-04-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921420427.1U Active CN210327525U (en) | 2019-08-29 | 2019-08-29 | Keyboard circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210327525U (en) |
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2019
- 2019-08-29 CN CN201921420427.1U patent/CN210327525U/en active Active
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