CN108768372B - Key circuit, printed circuit board and display device - Google Patents
Key circuit, printed circuit board and display device Download PDFInfo
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- CN108768372B CN108768372B CN201810421763.1A CN201810421763A CN108768372B CN 108768372 B CN108768372 B CN 108768372B CN 201810421763 A CN201810421763 A CN 201810421763A CN 108768372 B CN108768372 B CN 108768372B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/9645—Resistive touch switches
- H03K17/9647—Resistive touch switches using a plurality of detectors, e.g. keyboard
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
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- Microelectronics & Electronic Packaging (AREA)
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Abstract
The invention discloses a key circuit, a printed circuit board and a display device, which are used for being compatible with various interface definitions after one-time key circuit design, thereby improving the compatibility of the key circuit and reducing the development period. The key circuit includes: the device comprises a public end, a signal end and at least one test end; the signal end and the public end comprise a plurality of first reserved connecting parts, and the first reserved connecting parts are used for being electrically connected with each other through a lead or a constant value resistor so that the signal end is electrically connected with the public end; every two adjacent first reservation connecting portion, and first reservation connecting portion with including a button branch road between the public end, each button branch road include with test end electric connection's switching unit and second reserve connecting portion, the second is reserved connecting portion and is used for passing through wire or constant value resistance electricity and connects the second and reserves connecting portion both sides, makes test end with the public end electric connection.
Description
Technical Field
The invention relates to the technical field of printed circuit boards, in particular to a key circuit, a printed circuit board and a display device.
Background
With the iterative upgrade of household television products, products with different shapes of different molds come out endlessly, and a same mold may be matched with a plurality of different core schemes, and engineers need to update a Printed Circuit Board (PCB) Board diagram according to different motherboard schemes to achieve the purpose of adaptation. The PCB needs to be re-designed by drawing a board for updating, the board is washed and sampled, components are welded on the PCB for functional test after the board is returned, and then the PCB is re-produced, so that the time of at least 10 days is consumed, the development period is seriously influenced, and the manpower and the company resources are wasted.
Disclosure of Invention
The invention provides a key circuit, a printed circuit board and a display device, which are used for being compatible with various interface definitions after one-time key circuit design, thereby improving the compatibility of the key circuit and reducing the development period.
The embodiment of the invention provides a key circuit, which comprises:
the device comprises a public end, a signal end and at least one test end;
the signal end and the public end comprise a plurality of first reserved connecting parts, and the first reserved connecting parts are used for being electrically connected with each other through a lead or a constant value resistor so that the signal end is electrically connected with the public end;
every two adjacent first reservation connecting portion, and first reservation connecting portion with including a button branch road between the public end, each button branch road include with test end electric connection's switching unit and second reserve connecting portion, the second is reserved connecting portion and is used for passing through wire or constant value resistance electricity and connects the second and reserves connecting portion both sides, makes test end with the public end electric connection.
In a possible implementation manner, in the above key circuit provided in an embodiment of the present invention, the key circuit further includes:
the conducting wire is arranged on each first reserved connecting part; and the number of the first and second groups,
and the constant value resistor is arranged at each second reserved connecting part.
In a possible implementation manner, in the above key circuit provided in an embodiment of the present invention, the key circuit further includes:
the constant value resistor is arranged at each first reserved connecting part; and the number of the first and second groups,
and the conducting wire is arranged on each second reserved connecting part.
In a possible implementation manner, in the key circuit provided in the embodiment of the present invention, each of the switch units is respectively connected to the same test terminal.
In a possible implementation manner, in the key circuit provided in the embodiment of the present invention, the test end includes a first test end and a second test end;
at least one key branch is electrically connected with the first testing end;
the other key branches except the key branch electrically connected with the first testing end are electrically connected with the second testing end;
the first reserved connecting part on one side of the disconnected region is electrically connected with the public end, and the first reserved connecting part on the other side of the disconnected region is electrically connected with the signal end through the constant value resistor.
In a possible implementation manner, in the above key circuit provided in an embodiment of the present invention, the key circuit further includes:
and the conducting wires are arranged on each first reserved connecting part and each second reserved connecting part.
In a possible implementation manner, in the key circuit provided in the embodiment of the present invention, the number of the test terminals is the same as the number of the key branches.
In a possible implementation manner, in the key circuit provided in the embodiment of the present invention, the resistance values of the constant resistors disposed in any two reserved connection portions are different from each other.
Correspondingly, the embodiment of the invention also provides a printed circuit board, which comprises any one of the key circuits provided by the embodiment of the invention arranged on the printed circuit board.
Correspondingly, the embodiment of the invention also provides a display device which comprises the printed circuit board provided by the embodiment of the invention.
The invention has the following beneficial effects:
the key circuit provided by the embodiment of the invention comprises: the device comprises a public end, a signal end and at least one test end; the signal end and the public end comprise a plurality of first reserved connecting parts, and the first reserved connecting parts are used for being electrically connected with each other through a lead or a constant value resistor so that the signal end is electrically connected with the public end; every two adjacent first reservation connecting portion, and first reservation connecting portion with including a button branch road between the public end, each button branch road include with test end electric connection's switching unit and second reserve connecting portion, the second is reserved connecting portion and is used for passing through wire or constant value resistance electricity and connects the second and reserves connecting portion both sides, makes test end with the public end electric connection. Therefore, in the invention, through arranging the plurality of first reserved connecting parts and the plurality of second reserved connecting parts, arranging the conducting wires or the constant value resistors in the first reserved connecting parts and arranging the conducting wires or the constant value resistors in the second reserved connecting parts, the conversion among the plurality of interface definitions is realized only by changing the positions where the constant value resistors are arranged, therefore, after one-time circuit design, the invention is compatible with the plurality of interface definitions, thereby improving the compatibility of the key circuit and reducing the development period.
Drawings
Fig. 1 is a schematic structural diagram of a key circuit according to an embodiment of the present invention;
fig. 2A and fig. 2B are two schematic structural diagrams of a key circuit according to an embodiment of the invention;
fig. 3A and fig. 3B are schematic structural diagrams of a key circuit according to a third embodiment of the present invention;
FIG. 4 is a fourth schematic diagram of a key circuit according to an embodiment of the present invention;
fig. 5 is a fifth schematic structural diagram of a key circuit according to an embodiment of the present invention;
FIG. 6 is a sixth schematic diagram of a key circuit according to an embodiment of the present invention;
fig. 7 is a seventh schematic structural diagram of a key circuit according to an embodiment of the present invention;
fig. 8 is an eighth schematic structural diagram of a key circuit according to an embodiment of the present invention;
fig. 9 is a ninth schematic structural diagram of a key circuit according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are only for illustrating the relative positional relationship, the layer thicknesses of some parts are exaggerated in a drawing manner for easy understanding, and the layer thicknesses in the drawings do not represent the proportional relationship of the actual layer thicknesses.
It should be noted that in the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
The embodiment of the invention provides a key circuit, a printed circuit board and a display device, which are used for being compatible with various interface definitions after one-time key circuit design, thereby improving the compatibility of the key circuit and reducing the development period.
It should be noted that, in the present invention, after the first reserved connection portion and the second reserved connection portion are used for attaching a resistor or a wire, the first reserved connection portion electrically connects circuits on two sides of the first reserved connection portion, and the second reserved connection portion electrically connects circuits on two sides of the second reserved connection portion. The fixed value resistance that sets up in connecting portion is reserved to first reservation connecting portion and second is the same or different in size, and when the fixed value resistance is different, can arrange in proper order when placing fixed value resistance in first reservation connecting portion or second reservation connecting portion according to actual demand. When the fixed-value resistor or the lead is placed on the first reserved connecting part or the second reserved connecting part, the fixed-value resistor or the lead can be fixed in an attaching mode or in a welding mode. The first reserved connecting part and the second reserved connecting part have the same function and structure, and are only divided into the first reserved connecting part and the second reserved connecting part for the convenience of describing the key circuit structure.
Referring to fig. 1, an embodiment of the present invention provides a key circuit, including: a common terminal GND, a signal terminal VCC and at least one test terminal K1, K2 … … Km (m is more than or equal to 1); the signal terminal VCC and the common terminal GND are electrically connected in series through the conducting wires or the constant value resistors in the plurality of first reserved connecting parts Y1 and Y2 … … Ym (m is more than or equal to 1);
each two adjacent first reserved connecting parts and the first reserved connecting part and the common end GND comprise a key branch B1 and B2 … … Bm (m is more than or equal to 1), each key branch comprises a switch unit S1 and S2 … … Sm (m is more than or equal to 1) which are electrically connected with a testing end, a second reserved connecting part Z1 and Z2 … … Zm (m is more than or equal to 1), and the second reserved connecting part is used for electrically connecting the two sides of the second reserved connecting part through a wire or a constant resistor so that the testing end is electrically connected with the common end GND, namely, each testing end is electrically connected with the common end GND through the switch unit which is connected with the testing end in series, the wire or the constant resistor in the second reserved connecting part and the wire or the constant resistor in the first reserved connecting part which is positioned between the signal end VCC and the common end GND.
It should be noted that the key circuit shown in fig. 1 provided in the present invention can selectively use the first reserved connection portion, the second reserved connection portion, the test end, or the signal end as needed, so that a variety of interface definitions are implemented by the key circuit shown in fig. 1. If when realizing different interface definitions, the first reserved connecting portion, the second reserved connecting portion, the test end or the signal end that need not use can be unsettled, do not do any processing, and the first reserved connecting portion, the second reserved connecting portion, the test end and the signal end that need to use can carry out electric connection through modes such as welding, paster. In the invention, the two sides of the second reserved connecting part are used for electrically connecting the testing end and the common end with each other through a fixed value resistor or a lead arranged in the second reserved connecting part.
The switch unit in the embodiment of the invention can be a functional device which is driven to be turned on or turned off by voltage, such as a transistor; or a functional device that switches between on and off by an external force, such as a push button switch or the like, and is not particularly limited herein.
The connection mode of the key circuit shown in fig. 1 for implementing different analog circuits is further described below:
in one embodiment, based on the key circuit shown in fig. 1, a conductive line is disposed in the first reserved connection portions Y1 and Y2 … … Ym to suspend the signal terminal VCC; constant value resistors are respectively arranged in the second reserved connection parts Z1 and Z2 … … Zm, so that the key branches B1 and B2 … … Bm are electrically connected to the common terminal GND through the constant value resistors in the second reserved connection parts and the switch units in the conducting state, thereby obtaining the structure of the key circuit shown in fig. 2A. Specifically, as shown in fig. 2A, the first key branch B1 electrically connects the first test terminal K1 and the common terminal GND through the first switch unit S1, the first constant resistor R1 and the conductive line L; the second keying branch B2 electrically connects the second test terminal K2 with the common terminal GND through the second switch unit S2, the second constant resistor R2 and the conducting wire L; by analogy, the mth key branch Bm electrically connects the mth test terminal Km with the common terminal GND through the mth switch unit Sm, the mth fixed value resistor Rm and the lead L. Therefore, each key branch electrically connects the test terminal and the common terminal GND in a state where the switch unit is turned on. When the signal provided in the signal terminal VCC is not needed, the signal terminal VCC may be suspended, so that the plurality of first reserved connection portions are disconnected from the signal terminal VCC.
In specific implementation, the testing end can be connected to the control chip through the connector, and the control chip determines corresponding instructions or actions according to the received signals of the testing end. Furthermore, in order to reduce the number of pins occupied by the test terminal when connected with the control chip, each key branch can be connected to the same test terminal, so that the test terminal is electrically connected with the control chip through one pin. As shown in fig. 2B, the switch units S1, S2 … … Sm in each key branch B1, B2 … … Bm are connected to the first test terminal K1. Of course, the switch units S1, S2 … … Sm in each key branch B1, B2 … … Bm may also be connected to the second test terminal K2, or to either one of the test terminals. Or, the plurality of test ends are connected to the same test end through the lead, so that the plurality of test ends are electrically connected with the control chip through the same pin.
In a specific implementation, in order to determine that signals detected at the test end are different after any one of the switch units operates, in the key circuit provided in the embodiment of the present invention, resistance values of the fixed resistors of any two reserved connection portions are different from each other. As shown in fig. 2B, the first constant value resistor R1 in the first key branch B1 and the second constant value resistor R2 … … in the second key branch B2 and the mth constant value resistor Rm in the mth key branch Bm are different from each other. The size of the fixed value resistors can be set according to actual needs, and the arrangement sequence of the fixed value resistors in the key branches can be set according to actual needs. For example, the resistance value of each fixed resistor may be identified, and each reserved connection portion may be identified, so that each fixed resistor corresponds to each reserved connection portion one to one. As shown in fig. 2B, when the first switch unit S1 is turned on, the common terminal GND is divided by the first switch unit S1 and the first constant value resistor R1, and the first test terminal K1 detects a first voltage value U1; when the second switch unit S2 is turned on, the first test terminal K1 detects the second voltage value U2 by dividing the voltage of the common terminal GND through the second switch unit S2 and the second constant resistor R2. And so on. Therefore, since the resistances of the constant value resistors are different from each other, the voltage values detected at the first test terminal K1 are different from each other, and the control chip determines different responses or actions according to the voltage value signal at the first test terminal K1.
In another embodiment, based on the key circuit shown in fig. 1, constant value resistors are respectively disposed in the plurality of first reserved connection portions Y1 and Y2 … … Ym and electrically connected to the signal terminal VCC, so that the signal terminal VCC is electrically connected to the common terminal GND through the plurality of constant value resistors connected in series; the conducting wires are sequentially arranged in the second reserved connecting parts Z1 and Z2 … … Zm, so that the plurality of key branches B1 and B2 … … Bm are electrically connected with the common terminal GND sequentially through the switch unit in the conducting state, the conducting wires and the constant value resistor arranged in the first reserved connecting part, and the key circuit structure shown in fig. 3A is obtained. Specifically, as shown in fig. 3A, when all the switch units are not turned on, the signal terminal VCC is electrically connected to the common terminal GND through a plurality of constant value resistors (a first constant value resistor R1, a second constant value resistor R2 … …, an mth constant value resistor Rm) connected in series; if the first switch unit S1 is turned on, the first test terminal K1 is electrically connected to the signal terminal VCC through the first switch unit S1, the conductive line L, and the first constant resistor R1; if the second switch unit S2 is turned on, the second test terminal K2 is electrically connected to the signal terminal VCC through the second switch unit S2, the conductive line L, the second constant value resistor R2, and the first constant value resistor R1; in this way, if the mth switch unit Sm is turned on, the mth test terminal Km is electrically connected to the signal terminal VCC through the mth switch unit Sm, the conductive line L, the first fixed value resistor R1, and the mth fixed value resistor Rm of the second fixed value resistor R2 … …. Therefore, each key branch connects the test terminal connected with the key branch to the signal terminal VCC in the on state of the switch unit.
In specific implementation, the testing end can be connected to the control chip through the connector, and the control chip determines corresponding instructions or actions according to the received signals of the testing end. Furthermore, in order to reduce the number of pins occupied by the test terminal when connected with the control chip, each key branch can be connected to the same test terminal, so that the test terminal is electrically connected with the control chip through one pin. As shown in fig. 3B, the switch units S1, S2 … … Sm in each key branch B1, B2 … … Bm are connected to the first test terminal K1. Of course, the switch units S1, S2 … … Sm in each key branch B1, B2 … … Bm may also be connected to the second test terminal K2, or to either one of the test terminals. Or, the plurality of test ends are connected to the same test end through the lead, so that the plurality of test ends are electrically connected with the control chip through the same pin.
In a specific implementation, in order to determine that signals detected at the test end are different after any one of the switch units operates, in the key circuit provided in the embodiment of the present invention, resistance values of the fixed resistors in any two reserved connection portions are different from each other. As shown in fig. 3B, the first constant value resistor R1 and the second constant value resistor R2 … …, the mth constant value resistor Rm connected in series between the signal terminal VCC and the common terminal GND are different from each other. The size of the fixed value resistor can be set according to actual needs, and the arrangement sequence of the fixed value resistors in the key circuit can be set according to actual needs. For example, the resistance value of each fixed resistor may be identified, and each reserved connection portion may be identified, so that each fixed resistor corresponds to each reserved connection portion one to one. As shown in fig. 3B, when the first switch unit S1 is turned on, a loop is formed between the signal terminal VCC and the first test terminal K1 through the first switch unit S1, the conductive line L, and the first constant value resistor R1, and the first test terminal K1 detects a first voltage value U1; when the second switch unit S2 is turned on, a loop is formed between the signal terminal VCC and the first test terminal K1 through the second switch unit S2, the conductive line L, the first constant value resistor R1 and the second constant value resistor R2, and the second voltage value U2 is detected at the first test terminal K1; when the mth switch unit Sm is turned on, a loop is formed between the signal terminal VCC and the first test terminal K1 through the mth switch unit Sm, the lead line L, the first fixed value resistor R1, and the second fixed value resistor R2 … …, and the mth fixed value resistor Rm, and the mth voltage value Um is detected at the first test terminal K1. Therefore, since the resistances of the constant value resistors are different from each other, the voltage values detected at the first test terminal K1 are different from each other, and the control chip determines different responses or actions according to the voltage value signal at the first test terminal K1.
In a third embodiment, as shown in the key circuit of fig. 4, the testing terminals include a first testing terminal K1 and a second testing terminal K2, and other testing terminals can be suspended or connected to the first testing terminal K1 or the second testing terminal K2 respectively; the second reserved connecting parts Z1 and Z2 … … Zm are respectively provided with conducting wires L; at least one key branch B1, B2 … … Bm is electrically connected with the first test terminal K1; the other key branches except the key branch electrically connected with the first test terminal K1 are electrically connected with the second test terminal K2 (as shown in FIG. 4, the first key branch B1 and the second key branch B2 are electrically connected with the first test terminal K1; the mth key branch Bm is electrically connected with the second test terminal K2); respectively setting constant value resistors in the first reserved connection parts Y1 and Y2 … … Ym to ensure that a first constant value resistor R1 in the first reserved connection part Y1 is electrically connected with a signal terminal VCC, and an mth constant value resistor Rm in the first reserved connection part Ym is electrically connected with a common terminal GND; in addition, the key circuit further includes: the constant value resistor in the first reserved connecting part on one side of the disconnection region P is electrically connected with the common end GND, and the constant value resistor in the first reserved connecting part on the other side of the disconnection region P is electrically connected with the signal end VCC. As shown in fig. 4, the disconnection region P is located between Y3 and Y4 so that the third fixed-value resistor R3 is electrically connected to the common terminal GND; the fourth fixed-value resistor R4 is electrically connected with the signal terminal VCC; the first key branch B1, the second key branch B2 and the third key branch B3 are all electrically connected with the first test end K1; the fourth button branch B4 … … and the mth button branch Bm are electrically connected with the second test terminal K2.
It should be noted that, in the key circuit according to the embodiment of the present invention, a plurality of disconnection regions may be disposed between two adjacent first reserved connection portions, respectively, and different disconnection regions are located between two different first reserved connection portions. The above embodiments are only illustrated with respect to the case of including one broken region, and may further include a plurality of broken regions. And is not particularly limited herein.
In a specific implementation, in order to determine that signals detected at the test end are different after any one of the switch units operates, in the key circuit provided in the embodiment of the present invention, resistance values of the fixed resistors in any two reserved connection portions are different from each other. As shown in fig. 4, the first constant value resistor R1 and the second constant value resistor R2 … …, the mth constant value resistor Rm connected in series between the signal terminal VCC and the common terminal GND are different from each other. The size of the fixed value resistor can be set according to actual needs, and the arrangement sequence of the fixed value resistors in the key circuit can be set according to actual needs. For example, the resistance value of each fixed resistor may be identified, and each reserved connection portion may be identified, so that each fixed resistor corresponds to each reserved connection portion one to one. As shown in fig. 4, when the first switch unit S1 is turned on, a loop is formed between the signal terminal VCC and the first test terminal K1 through the first switch unit S1, the conductive line L, and the first constant value resistor R1, and the first test terminal K1 detects a first voltage value U1; when the second switch unit S2 is turned on, a loop is formed between the signal terminal VCC and the first test terminal K1 through the second switch unit S2, the conductive line L, the first constant value resistor R1 and the second constant value resistor R2, and the second voltage value U2 is detected at the first test terminal K1; when the fourth switch unit S4 is turned on, a loop is formed between the signal terminal VCC and the second test terminal K2 through the fourth switch unit S4, the conductive line L, and the fourth constant value resistor R4, and a fourth voltage value U4 is detected at the second test terminal K2; when the mth switch unit Sm is turned on, a loop is formed between the signal terminal VCC and the second test terminal K2 through the mth switch unit Sm, the lead L, and the mth fixed-value resistor Rm of the fourth fixed-value resistor R4 … …, and the mth voltage value Um is detected at the second test terminal K2. Therefore, since the resistances of the constant value resistors are different from each other, the voltage values detected at the first test terminal K1 are different from each other, and the control chip determines different responses or actions according to the voltage value signal at the first test terminal K1; the voltage values detected at the second test terminal K2 are different from each other, and the control chip determines different responses or actions according to the voltage value signal at the second test terminal K2.
In the fourth embodiment, as shown in fig. 5, in the key circuit, the conductive lines L are respectively disposed in the plurality of first reserved connecting portions Y1 and Y2 … … Ym, and the signal terminal VCC is suspended; the plurality of second reserved connecting parts Z1 and Z2 … … Zm are respectively provided with a conducting wire L, so that the key branches B1 and B2 … … Bm are respectively electrically connected with the common terminal GND through the switch unit and the conducting wire L. When the signal provided in the signal terminal VCC is not needed, the signal terminal VCC may be suspended, so that the plurality of first reserved connection portions are disconnected from the signal terminal VCC.
In a specific implementation, in the key circuit provided in the embodiment of the present invention, each of the key branches may be connected to the same test terminal or connected to different test terminals respectively. As shown in FIG. 5, the first key branch B1 is electrically connected to the first test terminal K1, and the second key branch B2 is electrically connected to the second test terminal K2; by analogy, the mth key branch Bm is electrically connected with the mth test terminal Km. When the first switch unit S1 is turned on, the first test terminal K1 is electrically connected to the common terminal GND through the first switch unit S1; when the second switch unit S2 is turned on, the second testing terminal K2 is electrically connected to the common terminal GND through the second switch unit S2; when the mth switch unit Sm is turned on, the mth test terminal Km is electrically connected to the common terminal GND through the mth switch unit Sm. Specifically, the signals of the m test terminals may be connected to the m pins in the control chip through the connector, so that the m pins in the control chip are grounded respectively.
As a more specific example, as shown in fig. 6, the key circuit includes a common terminal GND, a first test terminal K1 (other test terminals may be floating or connected to the first test terminal, respectively), a signal terminal VCC is floating or not provided (not shown in fig. 6 for unnecessary signal terminals and test terminals), 7 first reserved connections are Y1, Y2, Y3, Y4, Y5, Y6, and Y7, 7 second reserved connections are Z1, Z2, Z3, Z4, Z5, Z6, and Z7, respectively, a lead L is respectively arranged in each first reserved connection part, fixed value resistors with different resistance values are respectively arranged in each second reserved connection part, and the 7 fixed value resistors are respectively a first fixed value resistor R1, a second fixed value resistor R2, a third fixed value resistor R3, a fourth fixed value resistor R4, a fifth fixed value resistor R5, a sixth fixed value resistor R6 and a seventh fixed value resistor R7; the 7 key branches are all connected to the first testing terminal K1. In this embodiment, the 7 constant value resistors have different resistance values. When the first switching unit S1 is turned on, the first test terminal K1 detects the first voltage value U1; when the second switch unit S2 is turned on, the first test terminal K1 detects the second voltage value U2; when the third switching unit S3 is turned on, the first test terminal K1 detects the third voltage value U3; when the fourth switching unit S4 is turned on, the first test terminal K1 detects the fourth voltage value U4; when the fifth switch unit S5 is turned on, the first test terminal K1 detects the fifth voltage value U5; when the sixth switching unit S6 is turned on, the first test terminal K1 detects a sixth voltage value U6; when the seventh switching unit S7 is turned on, the first test terminal K1 detects the seventh voltage value U7. Therefore, according to the present invention, the key circuit shown in fig. 1 is provided to obtain the key structure shown in fig. 6, and a two-way analog interface mode can be realized.
As a more specific example, as shown in fig. 7, the key circuit includes a common terminal GND, 1 first test terminal K1 (other test terminals may be left alone or connected to the first test terminal, respectively) and a signal terminal VCC (none of which is shown in fig. 7 for the terminals not to be tested), 7 first reserved connections are Y1, Y2, Y3, Y4, Y5, Y6, and Y7, 7 second reserved connections are Z1, Z2, Z3, Z4, Z5, Z6, and Z7, and a conducting wire L is respectively disposed in each second reserved connection, each first reserved connection is provided with a fixed-value resistor with a different resistance value, and 7 fixed-value resistors are a first fixed-value resistor R1, a second fixed-value resistor R2, a third fixed-value resistor R3, a fourth fixed-value resistor R4, a fifth fixed-value resistor R5, a sixth fixed-value resistor R6, and a seventh fixed-value resistor R57324R 7; the 7 key branches are all connected to the first testing terminal K1. When the first switch unit S1 is turned on, the first test terminal K1 detects a first voltage value U1 through the voltage dividing effect of the first constant value resistor R1; when the second switch unit S2 is turned on, the first test terminal K1 detects a second voltage value U2 through the voltage division effect of the first constant value resistor R1 and the second constant value resistor R2; when the third switching unit S3 is turned on, the first test terminal K1 detects a third voltage value U3 through the voltage division effect of the first constant resistor R1, the second constant resistor R2 and the third constant resistor R3; when the fourth switching unit S4 is turned on, the first test terminal K1 detects a fourth voltage value U4 through the voltage division effect of the first constant resistor R1, the second constant resistor R2, the third constant resistor R3 and the fourth constant resistor R4; when the fifth switch unit S5 is turned on, the first test terminal K1 detects a fifth voltage value U5 through the voltage dividing effect of the first constant resistor R1, the second constant resistor R2, the third constant resistor R3, the fourth constant resistor R4 and the fifth constant resistor R5; when the sixth switch unit S6 is turned on, the first test terminal K1 detects a sixth voltage value U6 through the voltage division effect of the first fixed-value resistor R1, the second fixed-value resistor R2, the third fixed-value resistor R3, the fourth fixed-value resistor R4, the fifth fixed-value resistor R5 and the sixth fixed-value resistor R6; when the seventh switch unit S7 is turned on, the first test terminal K1 detects a seventh voltage value U7 through voltage division of the first fixed resistor R1, the second fixed resistor R2, the third fixed resistor R3, the fourth fixed resistor R4, the fifth fixed resistor R5, the sixth fixed resistor R6, and the seventh fixed resistor R7. Therefore, according to the present invention, the key circuit shown in fig. 1 is provided to obtain the key structure shown in fig. 7, so that a three-way analog interface mode can be realized.
As a more specific example, as shown in fig. 8, the key circuit includes a common terminal GND, a signal terminal VCC, a first test terminal K1 and a second test terminal K2 (other test terminals may be floating or connected to the first test terminal K1 and the second test terminal K2, respectively), none of which is shown in fig. 8 for unnecessary test terminals; the 7 first reserved connecting parts are respectively Y1, Y2, Y3, Y4, Y5, Y6 and Y7, the 7 second reserved connecting parts are respectively Z1, Z2, Z3, Z4, Z5, Z6 and Z7, each second reserved connecting part is respectively provided with a lead L, each first reserved connecting part is respectively provided with constant value resistors with different resistance values, and the constant value resistors are respectively a first constant value resistor R1, a second constant value resistor R2, a third constant value resistor R3, a fourth constant value resistor R4, a fifth constant value resistor R5, a sixth constant value resistor R6 and a seventh constant value resistor R7; the first keying branch B1, the second keying branch B2 and the third keying branch B3 are all connected to the first testing end K1; the other key branches are connected to the second testing terminal K2; a disconnection region P is further included between the third fixed resistor R3 and the fourth fixed resistor R4, such that the third fixed resistor R3 and the seventh fixed resistor R7 are electrically connected to the common terminal GND, and the first fixed resistor R1 and the fourth fixed resistor R4 are electrically connected to the signal terminal VCC. When the first switch unit S1 is turned on, the first test terminal K1 detects a first voltage value U1 through the voltage dividing effect of the first constant value resistor R1; when the second switch unit S2 is turned on, the first test terminal K1 detects a second voltage value U2 through the voltage division effect of the first constant value resistor R1 and the second constant value resistor R2; when the third switching unit S3 is turned on, the first test terminal K1 detects a third voltage value U3 through the voltage division effect of the first constant resistor R1, the second constant resistor R2 and the third constant resistor R3; when the fourth switch unit S4 is turned on, the second test terminal K2 detects a fourth voltage value U4 through the voltage dividing effect of the fourth constant value resistor R4; when the fifth switch unit S5 is turned on, the second test terminal K2 detects a fifth voltage value U5 through the voltage dividing effect of the fourth fixed-value resistor R4 and the fifth fixed-value resistor R5; when the sixth switching unit S6 is turned on, the second test terminal K2 detects a sixth voltage value U6 through the voltage division effect of the fourth fixed-value resistor R4, the fifth fixed-value resistor R5 and the sixth fixed-value resistor R6; when the seventh switching unit S7 is turned on, the second testing terminal K2 detects a seventh voltage value U7 by voltage division of the fourth fixed resistor R4, the fifth fixed resistor R5, the sixth fixed resistor R6 and the seventh fixed resistor R7. Therefore, according to the present invention, the key circuit shown in fig. 1 is provided to obtain the key structure shown in fig. 8, and a four-way analog interface mode can be realized.
As a more specific example, as shown in fig. 9, the key circuit includes a common terminal GND (not shown in fig. 9 for the unnecessary signal terminal and the test terminal), and 7 test terminals, which are respectively K1, K2, K3, K4, K5, K6, and K7; the 7 first reserved connection parts are respectively Y1, Y2, Y3, Y4, Y5, Y6 and Y7, the 7 second reserved connection parts are respectively Z1, Z2, Z3, Z4, Z5, Z6 and Z7, and a lead L is respectively arranged in each first reserved connection part and each second reserved connection part, so that each test end is grounded through a conducting switch unit.
In summary, according to the key circuit shown in fig. 1 provided in the embodiment of the present invention, the first reserved connection portion and the second reserved connection portion are electrically connected by a wire or a constant resistor, so as to implement circuit designs of multiple interfaces. For example, two-way simulated interface design, three-way simulated interface design, four-way simulated interface design, seven-way simulated interface design and the like, so that the purpose of completing various interface designs through one-time circuit design is realized, the working efficiency is further improved, the development period is shortened, and the compatibility is enhanced. Because the resistors or the wires in the first reserved connecting part and the second reserved connecting part can be realized in an attaching or welding mode, the conversion among various interface circuits is easier to realize.
Based on the same inventive concept, an embodiment of the present invention further provides a printed circuit board, including any of the above-mentioned key circuits provided by the embodiments of the present invention disposed on the printed circuit board. The printed circuit board can be applied to various interface circuits, the compatibility of the printed circuit board is improved, and the waste of materials and time during the manufacture of the printed circuit boards with different interface circuits is avoided, so that the working efficiency is improved, and the resources are saved. The printed circuit board of the present invention can be applied to any device having a key requirement.
The printed circuit board provided by the embodiment of the invention can be applied to not only a display panel but also an electrical device, and is not particularly limited herein.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including any one of the printed circuit boards provided in the embodiments of the present invention.
In summary, the key circuit provided in the embodiment of the present invention includes: the device comprises a public end, a signal end and at least one test end; the signal end and the public end comprise a plurality of first reserved connecting parts which are connected in series, and the first reserved connecting parts are used for being electrically connected with two sides of the first reserved connecting parts through wires or constant resistors so that the signal end is electrically connected with the public end; every two adjacent first reservation connecting portion, and first reservation connecting portion with including a button branch road between the public end, each button branch road include with the test end switching unit and the second of establishing ties reserve connecting portion, the second is reserved connecting portion and is used for passing through wire or constant value resistance electricity and connects the second and reserves connecting portion both sides, makes the test end with the public end electricity is connected. Therefore, in the invention, through arranging the plurality of first reserved connecting parts and the plurality of second reserved connecting parts, arranging the conducting wires or the constant value resistors in the first reserved connecting parts and arranging the conducting wires or the constant value resistors in the second reserved connecting parts, the conversion among the plurality of interface definitions is realized only by changing the positions where the constant value resistors are arranged, therefore, after one-time circuit design, the invention is compatible with the plurality of interface definitions, thereby improving the compatibility of the key circuit and reducing the development period.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A key circuit, comprising:
the device comprises a public end, a signal end and at least one test end;
the signal end and the public end comprise a plurality of first reserved connecting parts, and the first reserved connecting parts are used for being electrically connected with each other through a lead or a constant value resistor so that the signal end is electrically connected with the public end;
every two adjacent first reservation connecting portion, and first reservation connecting portion with including a button branch road between the public end, each button branch road include with test end electric connection's switching unit and second reserve connecting portion, the second is reserved connecting portion and is used for passing through wire or constant value resistance electricity and connects the second and reserves connecting portion both sides, makes test end with the public end electric connection.
2. The key circuit of claim 1, further comprising:
the conducting wire is arranged on each first reserved connecting part; and the number of the first and second groups,
and the constant value resistor is arranged at each second reserved connecting part.
3. The key circuit of claim 1, further comprising:
the constant value resistor is arranged at each first reserved connecting part; and the number of the first and second groups,
and the conducting wire is arranged on each second reserved connecting part.
4. A key circuit according to claim 2 or 3, wherein each switch unit is connected to the same test terminal.
5. The key circuit of claim 3, wherein the test terminals include a first test terminal and a second test terminal;
at least one key branch is electrically connected with the first testing end;
the other key branches except the key branch electrically connected with the first testing end are electrically connected with the second testing end;
the first reserved connecting part on one side of the disconnected region is electrically connected with the public end, and the first reserved connecting part on the other side of the disconnected region is electrically connected with the signal end through the constant value resistor.
6. The key circuit of claim 1, further comprising:
and the conducting wires are arranged on each first reserved connecting part and each second reserved connecting part.
7. The key circuit of claim 6, wherein the number of test terminals is the same as the number of key branches.
8. The key circuit according to any one of claims 1-3 and 5, wherein the fixed resistors disposed at any two reserved connecting portions have different resistance values.
9. A printed circuit board comprising the key circuit of any of claims 1-8 disposed on the printed circuit board.
10. A display device comprising the printed circuit board of claim 9.
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| CN201810421763.1A CN108768372B (en) | 2018-05-04 | 2018-05-04 | Key circuit, printed circuit board and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810421763.1A CN108768372B (en) | 2018-05-04 | 2018-05-04 | Key circuit, printed circuit board and display device |
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| CN108768372A CN108768372A (en) | 2018-11-06 |
| CN108768372B true CN108768372B (en) | 2022-04-22 |
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