CN213025336U - Selection circuit, connector and display device - Google Patents
Selection circuit, connector and display device Download PDFInfo
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- CN213025336U CN213025336U CN202022142736.6U CN202022142736U CN213025336U CN 213025336 U CN213025336 U CN 213025336U CN 202022142736 U CN202022142736 U CN 202022142736U CN 213025336 U CN213025336 U CN 213025336U
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Abstract
The utility model relates to a show technical field, provide a selection circuit, connector and display device, the connector that has selection circuit connects between display panel and screen drive board, and this selection circuit includes: the comparison module generates a control signal according to a comparison result of an input signal and a reference signal which are provided by the screen driving board through the connector; the switch module can select one of the switch modules to be switched on or switched off according to the control signal under the control of the input signal; and the functional modules are correspondingly connected with the switch modules one by one, and any one of the functional modules generates a functional signal under the conduction state of the switch module connected with the functional module. The selection circuit can adjust the on-off state of the circuit of the selection circuit according to the input signal, and selectively outputs a functional signal to the display panel, wherein the functional signal is used for controlling the opening or parameter adjustment of a certain test item in the display panel. Therefore, the multiplexing of the pins can be realized, and the utilization rate of the chip pins is improved.
Description
Technical Field
The utility model relates to a show technical field, concretely relates to selection circuit, connector and display device.
Background
As a basic element, connectors are used for current transmission between devices and devices, elements and elements, and systems to enable the electronic systems to function properly. Generally, the connector includes socket and plug, and socket and plug can peg graft as an organic whole each other, and wherein, set up a plurality of butt joint holes on the socket, set up electrically conductive electrode in each butt joint hole, each electrically conductive electrode can receive and transmit the electric current of different voltages to make different electric currents can transmit to different electronic components through the connector, so that each electronic component can normally work.
For example, in a display, a flexible flat cable with a large number of pins is generally used as a wire of a connector for connecting a display panel and a panel driving board, so that the panel driving board drives the display panel to normally display.
However, during the production and use process, the corresponding independent pins for different functions are separately connected to the corresponding chips or circuits, which is costly and results in wasted space and resources.
In addition, as the product requirements are diversified, since the integration degree of the connector is higher and the pin pitch is smaller, referring to fig. 1, in a video signal interface or connector connected between a driving chip and a display panel, a first pin which can be used for burning is connected with an Electrically Erasable Programmable Read Only Memory (EEPROM) through an I2C connection line (divided into a DATA line DATA or a clock line CLK according to the function realized by the connection line), and at the same time, a power module and a Timing Controller (TCON) are also connected to the first pin for function debugging of a post display module, a second pin is connected with a light emitting diode circuit (LED circuit) for backlight driving through a connection line, the first pin is adjacent to the second pin and has a small pitch, and the voltage on the connection line of the second pin is higher, 5 to 21V for convenience, and the voltage during normal operation is also 12V, in case the dislocation appears in the wire rod grafting during in-service use, will make I2C interconnecting link high pressure in twinkling of an eye, lead to the rear end chip to appear burning out the risk, cause the unable normal use problem of display panel.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a selection circuit, connector and display device can improve the problem that independent pin realized single function, has saved the cost, has improved the compatibility and the security of pin.
In one aspect the utility model provides a selection circuit, it includes:
the comparison module is connected with an input pin of the connector and used for generating a control signal according to a comparison result of an input signal and a reference signal provided by the connector;
the switch module is provided with a first input end connected with the output end of the comparison module and a second input end connected with the input pin of the connector, and is used for selecting one of the switch modules to be switched on or switched off according to the control signal under the control of the input signal;
and the functional modules are correspondingly connected with the switch modules one by one, and any one of the functional modules generates a functional signal when the switch module connected with the functional module is in a conducting state.
Further, the comparison module includes:
a third input end, connected to the input pin of the connector, for obtaining the input signal provided by the connector; and
a fourth input for obtaining the aforementioned reference signal.
Further, the switch module comprises at least a first switch module, the first switch module comprising:
a first transistor, a first end of which is connected with the input pin of the connector, and a second end of which is connected with the functional module;
a second transistor, wherein the first end of the second transistor is connected with the control end of the first transistor, the second end of the second transistor is grounded, and the control end of the second transistor is connected with the output end of the comparison module through a first resistor;
and a second resistor connected between a power supply terminal and a connection node of the first transistor and the second transistor.
Further, the switch module further comprises a second switch module, the second switch module comprising:
a third transistor, a first end of which is connected with the output end of the comparison module, and a control end of which is connected with the input pin of the connector;
and a control end of the fourth transistor is connected with the second end of the third transistor, the first end of the fourth transistor is connected with the input pin of the connector, and the second end of the fourth transistor is connected with the functional module.
Further, the function module includes:
a first functional module, an input end of which is connected with a second end of the first transistor, and which generates a first functional signal in the on state of the first switch module;
a second functional module, an input end of which is connected with the second end of the fourth transistor, and which generates a second functional signal in the on state of the second switch module,
the function module selects one of the first function signal and the second function signal to output according to the conducting state of the first switch module or the second switch module.
Further, the selection circuit further includes:
and the control module is respectively connected with the input pin of the connector and the output end of the comparison module, and is used for providing the reference signal, adjusting the circuit state of the control module according to the input signal and the control signal and changing the size of the reference signal.
Further, the control module includes:
the third resistor and the fourth resistor are connected between the power supply end and the ground in series, and a connecting node of the third resistor and the fourth resistor is connected with the fourth input end of the comparison module;
a fifth resistor and a fifth transistor connected in series between the fourth input terminal of the aforementioned comparison module and ground; and
and a sixth transistor, wherein a first end of the sixth transistor is connected with the output end of the comparison module, a second end of the sixth transistor is connected with the control end of the fifth transistor, and the control end of the sixth transistor is connected with the input pin of the connector.
Further, the second transistor, the third transistor, and the sixth transistor are all bipolar transistors,
the first transistor, the fourth transistor, and the fifth transistor are all metal oxide semiconductor field effect transistors.
On the other hand, the utility model provides a connector for a display panel, which comprises the selection circuit, the selection circuit is connected between the display panel and a screen driving board;
the selection circuit can adjust the on-off state of the circuit of the selection circuit according to an input signal which is accessed by the screen driving board through the connector, and selectively outputs a functional signal to the display panel, wherein the functional signal is used for controlling the parameter adjustment of a certain test item in the display panel.
On the other hand the utility model also provides a display device, it includes: a display panel, a screen driving board and the connector,
the connector is connected between the display panel and the screen driving board and used for adjusting the on-off state of a circuit of the connector according to an input signal provided by the screen driving board and selectively outputting a functional signal to the display panel, wherein the functional signal is used for controlling the opening or parameter adjustment of a certain test item in the display panel.
The utility model has the advantages that:
the utility model provides a selection circuit, connector and display device, in this display device, the connector that has the selection circuit is connected between display panel and screen drive board, and this selection circuit includes: the comparison module is connected with an input pin of the connector and used for generating a control signal according to a comparison result of an input signal and a reference signal which are provided by the screen driving board through the connector; the switch module can select one of the switch modules to be switched on or switched off according to the control signal under the control of the input signal; and the functional modules are correspondingly connected with the switch modules one by one, and any one of the functional modules generates a functional signal under the conduction state of the switch module connected with the functional module. The selection circuit can adjust the on-off state of the circuit of the selection circuit according to the input signal, and selectively outputs a functional signal to the display panel, wherein the functional signal is used for controlling the opening or parameter adjustment of a certain test item in the display panel. Therefore, the multiplexing of the pins can be realized, the space and the cost are saved, and the utilization rate of the chip pins is improved.
In addition, the risk of burning out of a rear end chip caused by dislocation in wire rod insertion can be avoided, normal test use of the display panel is guaranteed, and compatibility and safety of pins are improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a selection circuit for a connector in the prior art;
fig. 2 is a schematic block diagram of a selection circuit for a connector according to an embodiment of the present invention;
FIG. 3 shows a schematic diagram of the selection circuit shown in FIG. 2;
FIG. 4 shows a circuit configuration diagram of the selection circuit shown in FIG. 3;
FIG. 5 is a schematic diagram illustrating the selection of functions in the operation of the selection circuit shown in FIG. 4;
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in 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. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
It is known that the EDP interface (connector) is a fully digital interface based on Display Port architecture and protocol, and only a simple connector and few pins are required to transmit high-resolution signals, and simultaneously, multiple data transmission can be realized. Taking a liquid crystal display with a resolution of 1920x1200 and 24bit as an example, if an LVDS interface is adopted, 20 pairs of data transmission lines are needed; if an EDP interface is adopted, only 4 pairs of lines are needed. Therefore, the EDP interface has obvious advantages compared with the LVDS interface, and particularly has more remarkable effect in the current mainstream high-definition screen. In recent years, industrial personal computers and industrial tablet computers have adopted a lot of EDP interfaces for increasing the data transmission speed between a panel and a processor, and the EDP interfaces are rapidly becoming mainstream interfaces.
Along with the diversification of product requirements, the integration level of a middle screen driving board of the display device and a connector or an interface of a display panel is higher and higher, the size is smaller and smaller, the pin interval is also smaller and smaller, and in the production and use processes, corresponding different functions are independently connected to corresponding chips or circuits through corresponding independent pins, so that the cost is high, and the waste of space and resources is caused.
And the operating voltage demand of single function pin is different, if the dislocation appears in taking place the wire rod grafting, easily arouses that the chip that the pin rear end is connected has the risk of burning out, leads to the unable normal test of display panel and uses then.
Based on this, the embodiment of the utility model provides a selection circuit, connector and display device have realized that the pin is multiplexing, improve the utilization ratio of chip pin, have also improved the compatibility and the security of pin.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 2 shows a schematic block diagram of a selection circuit for a connector according to an embodiment of the present invention, fig. 3 shows a schematic structural diagram of the selection circuit shown in fig. 2, fig. 4 shows a circuit structural diagram of the selection circuit shown in fig. 3, and referring to fig. 2 to 4, an embodiment of the present invention provides a selection circuit 100 for a connector, which includes: the circuit comprises a comparison module 110, a switch module 130 and a function module 140, wherein the comparison module 110 is connected with an input pin of a connector 220 and is used for generating a control signal Vg according to a comparison result of an input signal VIN and a reference signal Vref provided by the connector 220; the switch module 130 has a first input end connected to the output end of the comparison module 110 and a second input end connected to the input pin of the connector 220, the first input end is used for accessing the control signal Vg, the second input end is used for accessing the input signal VIN, and the switch module 130 can select one of the switch modules 130 to be turned on or turned off according to the control signal Vg under the control of the input signal VIN; each of the functional modules 140 is connected to the switch modules 130 in a one-to-one correspondence, and when the switch module 130 connected to any one of the functional modules 140 is in an on state, a functional signal (signal1 or signal2) is generated.
In this embodiment, the comparing module 110 includes: a third input terminal, connected to an input pin of the connector 220, for obtaining an input signal VIN provided by the connector 220; and a fourth input for obtaining the aforementioned reference signal Vref. In one embodiment, the comparing module 110 is, for example, an error comparator, the third input terminal is a non-inverting input terminal of the error comparator 110, and the fourth input terminal is an inverting input terminal of the error comparator 110.
In the present embodiment, referring to fig. 3 and 4, the switch module 130 includes at least a first switch module 131 and a second switch module 132, the first switch module 131 including: a first transistor Q1, a second transistor Q2, a first resistor R1 and a second resistor R2, specifically, a first end of the first transistor Q1 is connected to the input pin of the connector 220, and a second end is connected to the functional module 140; a first end of the second transistor Q2 is connected to the control end of the first transistor Q1, a second end is grounded, and the control end is connected to the output end of the error comparator 110 through a second resistor R2; the first resistor R1 is connected between the power supply terminal VDD and the connection node of the first transistor Q1 and the second transistor Q2, and the first resistor R1, the second transistor Q2 and the second resistor R2 form an inverter for adjusting the gate control voltage of the first transistor Q1 according to the control signal.
Specifically, when the error comparator 110 outputs a high-level control signal, the second transistor Q2 is turned on, the gate control voltage of the first transistor Q1 is pulled down to a low level, the first transistor Q1 is turned off, and the first switching module 131 is in an off state; when the error comparator 110 outputs a low-level control signal, the second transistor Q2 is turned off, the power supply terminal VDD is divided by the first resistor R1 to make the gate control voltage of the first transistor Q1 at a high level, the first transistor Q1 is turned on, and the first switch module 131 is in an on state.
Further, the second switch module 132 includes: a third transistor Q3 and a fourth transistor Q4, specifically, a first end of the third transistor Q3 is connected to the output end of the error comparator 110, and a control end is connected to the input pin of the connector 220; the control terminal of the fourth transistor Q4 is connected to the second terminal of the third transistor Q3, the first terminal is connected to the input pin of the connector 220, and the second terminal is connected to the functional module 140.
Specifically, when the error comparator 110 outputs a high-level control signal, the third transistor Q3 is turned on, and then the fourth transistor Q4 is turned on, and the second switch module 132 is turned on when the first switch module 131 is in an off state; when the error comparator 110 outputs the low-level control signal, the third transistor Q3 is turned off, and then the fourth transistor Q4 is turned off, so as to ensure that the second switching module 132 is turned off when the first switching module 131 is in the on state.
In this embodiment, the function module 140 includes: a first functional module 141 and a second functional module 142, wherein an input terminal of the first functional module 141 is connected to a second terminal of the first transistor Q1, and when the first switching module 131 is in a conducting state, a first functional signal1 is generated; the input end of the second functional module 142 is connected to the second end of the fourth transistor Q4, and when the second switch module 132 is in the on state, the functional module 140 generates the second functional signal2, and selects one of the first functional signal1 and the second functional signal2 to output according to the on state of the first switch module 131 or the second switch module 132.
It should be noted that the present application is not limited to two kinds of functional modules 141 and 142, and may be three or more, and in practical applications, the design may be performed according to practical requirements, and the switch module 130 and the functional module 140 are in a one-to-one mapping relationship. In this embodiment, each of the functional modules 141 (or 142) has a switch module 131 (or 132) connected thereto, and the on/off state of the circuit thereof can be adjusted according to the input signal VIN and the control signal Vg output by the error comparator 110, so as to provide that the corresponding functional module 141 (or 142) is turned on or off, and at most one switch module 131 (or 132) is in the on state at any time.
Further, the selection circuit 100 further includes a control module 120, and the control module 120 is respectively connected to the input pin of the connector 220 and the output terminal of the error comparator 110, and is configured to provide the aforementioned reference signal Vref and adjust its circuit state according to the input signal VIN and the control signal Vg, so as to change the magnitude of the reference signal Vref.
Specifically, the control module 120 includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fifth transistor Q5 and a sixth transistor Q6, wherein the third resistor R3 and the fourth resistor R4 are connected in series between the supply terminal VDD and ground, and a connection node of the third resistor R3 and the fourth resistor R4 is connected to the inverting input terminal of the error comparator 110; a fifth resistor R5 and a fifth transistor Q5 are connected in series between the inverting input of the error comparator 110 and ground; a first terminal of the sixth transistor Q6 is connected to the output terminal of the error comparator 110, a second terminal of the sixth transistor Q6 is connected to the control terminal of the fifth transistor Q5, and the control terminal is connected to the input pin of the connector 220.
In this embodiment, the switch module 130 can select the first switch module 131 (or the second switch module 132) in the switch module 130 to be turned on or off according to the change of the input signal VIN and the control signal Vg, and the first function module 141 (or the second function module 142) correspondingly connected to the first switch module 131 (or the second switch module 132) generates the function signal1 (or the signal2) in the on state of the switch module 131 (or 132) connected thereto, so as to switch the output state to realize the selection of the function.
In addition, the reference signal Vref output by the control module 120 is at a constant level when the first switch module 131 operates (the input signal VIN is at a low level), when the switch module 130 performs circuit switching (the first switch module 131 is turned off and the second switch module 132 is turned on), along with the rising of the input signal VIN, the control signal Vg is changed from a low level to a high level, along with the conduction of the sixth transistor Q6, the fifth transistor Q5 is sequentially turned on, and the voltage division network formed by the fifth resistor R5, the third resistor R3 and the fourth resistor R4 realizes voltage regulation (reduction) of the reference signal Vref, so that the output control signal Vg is ensured to be at a high level, thereby preventing the input voltage from rising to a start critical point of the first switch module 131 during circuit switching, and enabling the first switch module 131 to be temporarily turned on by mistake, which causes display abnormality (such as screen flicker).
Further, the second Transistor Q2, the third Transistor Q3, and the sixth Transistor Q6 are all Bipolar Junction Transistors (BJTs), and the first Transistor Q1, the fourth Transistor Q4, and the fifth Transistor Q5 are all Metal Oxide Semiconductor Field Effect Transistors (MOSFETs).
In the present embodiment, more specifically, the second transistor Q2, the third transistor Q3 and the sixth transistor Q6 are all NPN-type bipolar transistors, and the first transistor Q1, the fourth transistor Q4 and the fifth transistor Q5 are all N-type MOS transistors.
In one embodiment, taking an EDP interface (connector) as an example, a plurality of functional signal terminals (e.g., functional signal terminals such as DBC/Bist/HPD on a display panel) are led out through one pin on a display panel connected to the EDP interface (connector), and the selection circuit 100 in this embodiment is connected to one pin of the EDP interface (connector), so as to improve the pin utilization rate, simplify the product design, optimize the later product debugging process, save the cost, and improve the compatibility and the security of the pin line.
The aforementioned DBC signal terminal can be used to call a database to modify the display attribute or parameter, and the HPD signal terminal can be used to output a detection signal from the display to the host computer. The HDMI (19Pin)/DVI (16Pin) connected with the port is used for Hot Plug Detection (HPD), and a signal output by the HPD signal end is used as a basis for judging whether the TMDS signal is transmitted to the HDMI/DVI or not by the host system. The hot plug detection is used for detecting the event through the HPD pin of the HDMI/DVI and responding when the digital display such as a display is connected or disconnected with the computer host through the DVI interface. The signal of the Bist signal end is used for triggering the built-in self-test function of the display, for example, the self-test function is realized by a related function circuit which is implanted in the circuit in advance during design, so that the dependence of device test on Automatic Test Equipment (ATE) is reduced, and the pin function of the connector is enriched.
Referring to fig. 5, the comparing module 110 receives the input signal VIN provided by the input pin of the connector 220, and the control module 120 receives the power signal provided by the power supply terminal VDD and outputs a corresponding divided signal as the reference signal Vref. When the level of the input signal VIN connected to the input pin of the connector 220 is 0, the output of the error comparator 110 is a low level, the first switch module 131 and the second switch module 132 are both in an off state, at this time, the first functional module 141 and the second functional module 142 are not turned on, and the output end of the functional module 140 is in a first state a;
when the input signal VIN received at the input pin of the connector 220 is 0-3.3 v, the gate voltages received at the control terminals of the third transistor Q3 and the sixth transistor Q6 are less than the turn-on voltage thereof, the third transistor Q3 and the sixth transistor Q6 are both in the turn-off state, the fourth transistor Q4 is not turned on and is also in the turn-off state, the second switch module 132 is not turned on, so the second function module 142 is not turned on, the sixth transistor Q6 is turned off, the fifth transistor Q5 is also in the turn-off state, the reference voltage Vref level output by the control module 120 is constant, the power supply terminal VDD supplies power to the control terminal of the first transistor Q1 through the third resistor R3, the error comparator 110 is low in output, the gate voltage received at the control terminal of the second transistor Q2 is less than the turn-on voltage thereof and is in the turn-off state, so the first switch module 131 is turned on, the first function module 141 is turned on, the output terminal of the function module 140 is in the second state b, outputting a first function signal 1;
when the level of the input signal VIN received at the input pin of the connector 220 reaches 5.5v, at this time, the error comparator 110 outputs a high level, the gate voltage received at the control terminals of the third transistors Q3 and Q6 reaches its turn-on voltage, the third transistor Q3 and the sixth transistor Q6 are both turned on, the fourth transistor Q4 and the fifth transistor Q5 are also turned on, the second switch module 132 is turned on, so the second function module 142 is turned on, the fifth transistor Q5 is turned on, the potential of the connection node between the fourth resistor R4 and the fifth resistor R5 is pulled low through the voltage division network formed by the fifth resistor R5, the third resistor R3 and the fourth resistor R4, even if the potential of the reference signal Vref obtained at the inverting input terminal of the error comparator 110 is pulled low, the error comparator 110 continues to output a high level, the gate voltage received at the control terminal of the second transistor Q2 reaches its turn-on voltage, so that the third transistor Q2 is turned on, the gate voltage of the first transistor Q1 is pulled low, so the first transistor Q1 is turned off, the first switch module 131 is turned off, the first function module 141 is turned off, and the output terminal of the function module 140 is in the third state c to output the second function signal 2.
On the other hand the utility model provides a connector (not shown) for display panel, this connector include the selection circuit as in the embodiment described above, this connector is connected between display panel and screen drive board, and in this connector, selection circuit can adjust the break-make state of self circuit according to the input signal that screen drive board passes through this connector pin and inserts, selects to output a function signal to display panel, and this function signal is used for controlling opening or parameter control of a certain test item in the display panel.
Compare the use of independent pin realization single function's connector among the prior art, the embodiment of the utility model provides a connector draw forth the connection with same pin through display panel multiple function terminal, has avoided the complication of pin, has simplified product design, has improved product utilization rate, also helps optimizing the flow of later stage functional debugging simultaneously, improves the competitiveness of product.
In one embodiment, the wires of the connector are flexible flat cables (FCC).
Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 6, the display device 200 in this embodiment includes: the display panel 230, the panel driving board 210, and the connector 220 having the selection circuit 100 at the pin terminal in the above embodiments.
The connector 220 is connected between the display panel 230 and the screen driving board 210, and is configured to adjust an on-off state of the self-selection circuit 1100 according to an input signal VIN provided by the screen driving board 210, and to selectively output a function signal (any one of signal1, signal2, … …, and signal) to the display panel 230, where the function signal is used to control the on-state or parameter adjustment of a certain test item in the display panel 230.
In this embodiment, the number of the functional modules 141 and 142 is not limited to two, and may be three or more (the first functional module, the second functional module, … …, and the nth functional module), which can be designed according to actual requirements in practical applications, and the switch module 130 and the functional module 140 are in a one-to-one mapping relationship, and similarly include a plurality of switch modules (the first switch module, the second switch module, … …, and the nth switch module). Taking the two functional modules in the foregoing embodiment as an example, each of the functional modules 141 (or 142) has a switch module 131 (or 132) connected thereto, and the on-off state of the circuit thereof can be adjusted according to the input signal VIN and the control signal Vg output by the error comparator 110, so as to provide that the corresponding functional module 141 (or 142) is turned on or off, and at most one switch module 131 (or 132) is in the on state at any time.
In one embodiment, the Display device 60 may be any type of Display device provided with the connector 220, such as a Liquid Crystal Display (LCD), an Organic electroluminescent Display (OLED) Display device, a Quantum Dot Light Emitting diode (QLED) Display device, a curved Display device, or the like.
In one embodiment, display panel 230 includes a pixel array comprised of rows of pixels and columns of pixels.
The utility model provides a selection circuit, connector and display device, in this display device, the connector that has the selection circuit is connected between display panel and screen drive board, and this selection circuit includes: the comparison module is connected with an input pin of the connector and used for generating a control signal according to a comparison result of an input signal and a reference signal which are provided by the screen driving board through the connector; the switch module can select one of the switch modules to be switched on or switched off according to the control signal under the control of the input signal; and the functional modules are correspondingly connected with the switch modules one by one, and any one of the functional modules generates a functional signal under the conduction state of the switch module connected with the functional module. The selection circuit can adjust the on-off state of the circuit of the selection circuit according to the input signal, and selectively outputs a functional signal to the display panel, wherein the functional signal is used for controlling the opening or parameter adjustment of a certain test item in the display panel. Therefore, the multiplexing of the pins can be realized, the space and the cost are saved, and the compatibility and the safety of the pin circuit are improved;
compared with the connector with single function realized by independent pins in the prior art, the connector has the advantages that the connection terminals of the functional modules are led out and connected by the same pin, the complication of the pin is avoided, the product design is simplified, the product utilization rate is improved, meanwhile, the optimization of the later functional debugging process is facilitated, and the product competitiveness is improved.
It should be noted that in the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", and the like, indicate positional or positional relationships for convenience of description of the present invention and to simplify the description, but do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Further, in this document, the contained terms "include", "contain" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.
Claims (10)
1. A selection circuit, comprising:
the comparison module is connected with an input pin of the connector and used for generating a control signal according to a comparison result of an input signal and a reference signal provided by the connector;
the switch module is provided with a first input end connected with the output end of the comparison module and a second input end connected with the input pin of the connector, and is used for selecting one of the switch modules to be switched on or switched off according to the control signal under the control of the input signal;
the functional modules are connected with the switch modules in a one-to-one correspondence mode, and any one of the functional modules generates a functional signal when the switch module connected with the functional module is in a conducting state.
2. The selection circuit of claim 1, wherein the comparison module comprises:
a third input terminal, connected to an input pin of the connector, for acquiring an input signal provided by the connector; and
a fourth input to obtain the reference signal.
3. The selection circuit of claim 2, wherein the switch modules comprise at least a first switch module, the first switch module comprising:
a first transistor, a first end of which is connected with the input pin of the connector, and a second end of which is connected with the functional module;
a first end of the second transistor is connected with a control end of the first transistor, a second end of the second transistor is grounded, and the control end of the second transistor is connected with the output end of the comparison module through a first resistor;
a second resistor connected between a power supply terminal and a connection node of the first transistor and the second transistor.
4. The selection circuit of claim 3, wherein the switch module further comprises a second switch module, the second switch module comprising:
a first end of the third transistor is connected with the output end of the comparison module, and a control end of the third transistor is connected with the input pin of the connector;
and a control end of the fourth transistor is connected with the second end of the third transistor, the first end of the fourth transistor is connected with the input pin of the connector, and the second end of the fourth transistor is connected with the functional module.
5. The selection circuit of claim 4, wherein the functional module comprises:
the input end of the first functional module is connected with the second end of the first transistor, and a first functional signal is generated under the conducting state of the first switch module;
a second functional module, an input end of which is connected with a second end of the fourth transistor, and which generates a second functional signal in a conducting state of the second switch module,
and the functional module selects one of the first functional signal and the second functional signal to output according to the conducting state of the first switch module or the second switch module.
6. The selection circuit of claim 5, further comprising:
and the control module is respectively connected with the input pin of the connector and the output end of the comparison module, and is used for providing the reference signal, adjusting the circuit state of the control module according to the input signal and the control signal and changing the size of the reference signal.
7. The selection circuit of claim 6, wherein the control module comprises:
the third resistor and the fourth resistor are connected between a power supply end and the ground in series, and a connection node of the third resistor and the fourth resistor is connected with a fourth input end of the comparison module;
a fifth resistor and a fifth transistor connected in series between the fourth input of the comparison module and ground; and
and a first end of the sixth transistor is connected with the output end of the comparison module, a second end of the sixth transistor is connected with the control end of the fifth transistor, and the control end of the sixth transistor is connected with the input pin of the connector.
8. The selection circuit of claim 7, wherein the second transistor, the third transistor, and the sixth transistor are all bipolar transistors,
the first transistor, the fourth transistor, and the fifth transistor are all metal oxide semiconductor field effect transistors.
9. A connector for a display panel, the connector comprising the selection circuit according to any one of claims 1 to 8, connected between the display panel and a screen driving board;
the selection circuit can adjust the on-off state of the circuit of the selection circuit according to the input signal provided by the screen driving board through the connector, and selectively outputs a functional signal to the display panel, wherein the functional signal is used for controlling the opening or parameter adjustment of a certain test item in the display panel.
10. A display device, comprising: a display panel, a screen driving board, and the connector of claim 9,
the connector is connected between the display panel and the screen driving board and used for adjusting the on-off state of a circuit of the connector according to an input signal provided by the screen driving board and selectively outputting a functional signal to the display panel, wherein the functional signal is used for controlling the opening or parameter adjustment of a certain test item in the display panel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022142736.6U CN213025336U (en) | 2020-09-25 | 2020-09-25 | Selection circuit, connector and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022142736.6U CN213025336U (en) | 2020-09-25 | 2020-09-25 | Selection circuit, connector and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113763898A (en) * | 2021-08-31 | 2021-12-07 | 惠科股份有限公司 | Control circuit, driving method thereof and display device |
| CN114019357A (en) * | 2021-10-27 | 2022-02-08 | 浪潮(北京)电子信息产业有限公司 | Management method of test pin of logic processing module and related assembly |
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2020
- 2020-09-25 CN CN202022142736.6U patent/CN213025336U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113763898A (en) * | 2021-08-31 | 2021-12-07 | 惠科股份有限公司 | Control circuit, driving method thereof and display device |
| CN114019357A (en) * | 2021-10-27 | 2022-02-08 | 浪潮(北京)电子信息产业有限公司 | Management method of test pin of logic processing module and related assembly |
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