CN103927956A - Drive circuit of display panel, display panel and display device - Google Patents
Drive circuit of display panel, display panel and display device Download PDFInfo
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- CN103927956A CN103927956A CN201310724515.1A CN201310724515A CN103927956A CN 103927956 A CN103927956 A CN 103927956A CN 201310724515 A CN201310724515 A CN 201310724515A CN 103927956 A CN103927956 A CN 103927956A
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Abstract
The invention discloses a drive circuit of a display panel, the display panel and a display device. The drive circuit of the display panel comprises functional pins and a control circuit, wherein the functional pins are used for being connected with corresponding external circuits to achieve predetermined functions, and the control circuit is controlled by an enabling signal to enable the functional pins to achieve the signal transmission function or to have high impedance. According to the drive circuit of the display panel, the display panel and the display device, the drive circuit does not need to be removed from the display panel after the drive circuit is connected with the display panel, disconnection between the drive circuit and the display panel can be realized, the detection cost is reduced, and the detection process is simplified.
Description
Technical field
The present invention relates to display technique field, be specifically related to a kind of driving circuit, display panel and display device of display panel.
Background technology
Display device has been widely used in the products such as TV, notebook computer, mobile phone, personal digital assistant at present, and display panel is the key element of display device, a lot of display panels are all realized Presentation Function by the driving circuit that connects a band encapsulation.
The connected mode of display panel and driving circuit generally has two kinds, one method is surface mount device display device (Surface Mounted Devices, be called for short SMD), be directly installed on printed circuit board (Printed Circuit Board is called for short PCB) by display panel and driving circuit; Another kind method is that chip is directly bundled in (Chip on Glass on glass, be called for short COG) display device, this method for designing has reduced cabling and the number of plies on PCB, cut down the size and sophistication of circuit board, and reduced the driving circuit encapsulation using in SMD mode, reduce system cost.
Fig. 1 a is the schematic diagram of driving circuit of the prior art, and as shown in Figure 1a, driving circuit schematically shows two functional pins, and each functional pin only exists two kinds of patterns in the prior art, inputs state and output state.Fig. 1 b is the schematic diagram of display panel of the prior art.This display panel comprises the non-display area P of viewing area A and periphery, viewing area, part between display panel edge and border, viewing area is non-display area P, at non-display area, P is provided with driving circuit, the functional pin being connected with described driving circuit, in described viewing area A, comprise several pixel cells, under each pixel cell, be provided with corresponding liner, described liner is corresponding one by one with the functional pin in driving circuit, described driving circuit sends described driving signal to viewing area A on display panel by described liner, in the time carrying out the detection of COG module, first carry out panel detection, the panel detecting after qualified carries out module group assembling, assembling later module re-uses external probe reserved two test pads on display panel and for example inputs detection signal in " 10 " and " 20 " in Fig. 1 b module to be detected is detected, but the module after engaging is bad if there is product, cannot judge the problem of driving circuit or the problem of display panel, now, often need driving circuit to take off from display panel, after using cleaning robot to clean driving circuit, detecting is respectively the problem of driving circuit or the problem of display panel again.The method for designing of this driving circuit makes detection display module cost higher, trace routine complexity.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of driving circuit, display panel and display device of display panel, the problem of the higher and trace routine complexity of testing cost while occurring that product is bad to solve after display panel and driving circuit engage.
First aspect, the embodiment of the present invention provides a kind of driving circuit of display panel, and described driving circuit comprises:
Functional pin, for connecting corresponding external circuit to realize predetermined function;
Control circuit, for making described functional pin realize signal transfer functions or presenting high-impedance state under the control of enable signal.
Second aspect, the embodiment of the present invention provides a kind of display panel, and described display panel comprises the driving circuit of first aspect.
The third aspect, the embodiment of the present invention provides a kind of display device, and described display device comprises the display panel of second aspect.
The driving circuit of the display panel that the embodiment of the present invention provides, display panel and display device, connect corresponding external circuit to realize predetermined function by functional pin, selecting to control described functional pin by enable signal realizes signal transfer functions or is high-impedance state, thus, make display panel and driving circuit after joint, also can realize the disconnection of display panel and driving circuit, thereby after being engaged, display panel and driving circuit do not need driving circuit to take off and just can distinguish detection display panel and driving circuit from display panel, Judging fault source, reduce testing cost, simplify trace routine.
Brief description of the drawings
To, by describe exemplary embodiment of the present invention in detail with reference to accompanying drawing, the person of ordinary skill in the art is more clear that above-mentioned and other feature and advantage of the present invention below, in accompanying drawing:
Fig. 1 a is according to the schematic diagram of the driving circuit of prior art;
Fig. 1 b is according to the schematic diagram of the display panel of prior art;
Fig. 2 a is according to the schematic diagram of the driving circuit of first embodiment of the invention;
Fig. 2 b is according to the schematic diagram of the display panel of first embodiment of the invention;
Fig. 3 is according to the schematic diagram of the driving circuit of second embodiment of the invention;
Fig. 4 a is according to the schematic diagram of the driving circuit of third embodiment of the invention;
Fig. 4 b is according to the schematic diagram of the display panel of third embodiment of the invention;
Fig. 5 is according to the schematic diagram of the driving circuit of fourth embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, in accompanying drawing, only show part related to the present invention but not full content, and size and the size of shown structure in accompanying drawing, not actual or to the size of the proportional structure of reality.
In Fig. 2 b, the first embodiment of the present invention is shown at Fig. 2 a.
First embodiment of the invention is the driving circuit about display panel, and described driving circuit comprises: functional pin, for connecting corresponding external circuit to realize predetermined function; Control circuit, for making described functional pin realize signal transfer functions or presenting high-impedance state under the control of enable signal.Fig. 2 a is according to the schematic diagram of the driving circuit of first embodiment of the invention, as shown in Figure 2 a, driving circuit 1 comprises functional pin 11 and control circuit corresponding thereto 12, wherein, functional pin 11 can comprise input pin 111, output pin 112 and unsettled pin 113, and control circuit 12 can comprise processing module 121 and trigistor 122 or 123.In Fig. 2 a, for clearly explanation, schematically show two trigistors, but should not limit the present invention with this.
It will be understood by those skilled in the art that driving circuit 1 described herein is only for explaining the present invention, but not limitation of the invention.The number of input pin 111, output pin 112 and the unsettled pin 113 of functional pin 11 used can not be to be only defined in 1, control circuit 12 not only includes processing module 121 and two trigistors 122 and 123, the present embodiment is a preferred embodiment, and all existing driving circuits all can be applicable to the present invention.
In the present embodiment, functional pin 11 connects corresponding external circuit to realize predetermined function, described predetermined function includes, but are not limited to trigger voltage input, bias voltage input, ground connection, mu balanced circuit control Voltage-output, cross current control voltage input end and the input of on/off control voltage etc., input pin 111 is for inputting external signal described driving circuit, wherein, input pin 111 includes, but are not limited to grounding pin, power supply input pin and reset input pin etc., output pin 112 drives described display panel signal for exporting, unsettled pin 113 can be for being arranged to vacant state by pin unnecessary in driving circuit.
Described control circuit for making functional pin 11 realize signal transfer functions or present high-impedance state under the control of enable signal.In the time that functional pin 11 presents high-impedance state, described driving circuit and display panel disconnect.
Comprise that taking described control circuit two trigistors describe as example below.Described control circuit comprises trigistor 122 and 123, trigistor 122 comprises Enable Pin 1221, first signal end 1222 and secondary signal end 1223, wherein, input pin 111 in first signal end 1222 linkage function pins 11, secondary signal end 1223 connects processing module 121, Enable Pin 1221 receives described enable signal, and according to whether realizing signal transmission between functional pin described in described enable signal control and described processing module, whether also control described external signal can be realized and be transferred to processing module 121 by functional pin, in the present embodiment, described processing module comprises the circuit that drives described display panel to show, circuit in described processing module includes, but are not limited to timing circuit, operational amplification circuit, reset circuit, media transmission protocol circuit and dynamic backlight control driving circuit etc., the internal circuit configuration difference of the processing module in different driving circuit, except realizing signal transmission, also can be according to different objects, circuit structure is realized different functions, specifically can carry out physical circuit design to processing module 121 according to needs.Because the physical circuit of described processing module is not emphasis of the present invention, therefore do not launch in detail at this.Equally, trigistor 123 comprises Enable Pin 1231, first signal end 1232 and secondary signal end 1233, wherein, and the output pin 112 in first signal end 1232 linkage function pins 11, secondary signal end 1233 connects processing module 121, and Enable Pin 1231 receives described enable signal.
Alternatively, described trigistor is metal-oxide-semiconductor, wherein said Enable Pin is the grid of described metal-oxide-semiconductor, drain electrode (or the source electrode that described first signal end is described metal-oxide-semiconductor, according to the type decision of metal-oxide-semiconductor), and the source electrode that described secondary signal end is described metal-oxide-semiconductor (or drain electrode, according to the type decision of metal-oxide-semiconductor).
Specifically alternatively, described metal-oxide-semiconductor can be PMOS pipe, in the time that described Enable Pin signal is high level, the cut-off of described PMOS pipe, make described functional pin in high-impedance state, in the time that described Enable Pin signal is low level, the conducting of described PMOS pipe, makes to realize signal between described functional pin and described processing module and transmits.
In the time that described trigistor is PMOS pipe, if in the time of described Enable Pin input high level, the cut-off of described PMOS pipe, make described functional pin in high-impedance state, now, driving circuit 1 is equivalent to suspended state, disconnect and being electrically connected with described display panel, when described display panel after engaging and driving circuit find that product is bad, can detect respectively described display panel and driving circuit, determine the source of fault, and do not need described driving circuit to take off from described display panel, avoided loaded down with trivial details processing.
Specifically alternatively, described metal-oxide-semiconductor can be also NMOS pipe, in the time that described enable signal is low level, the cut-off of described NMOS pipe, make described functional pin in high-impedance state, in the time that described enable signal is high level, the conducting of described NMOS pipe, makes to realize signal between described functional pin and described processing module and transmits.
Equally, in the time that described trigistor is NMOS pipe, when at described Enable Pin input low level, the cut-off of described NMOS pipe, make described functional pin in high-impedance state, now, driving circuit is equivalent to suspended state, disconnect and being electrically connected with described display panel, when described display panel after engaging and driving circuit find that product is bad, can detect respectively described display panel and driving circuit, determine the source of fault, and do not need described driving circuit to clean after display panel is taken off.
Fig. 2 b is according to the schematic diagram of the display panel of first embodiment of the invention, as shown in Figure 2 b, this display panel comprises the non-display area P of viewing area A and periphery, viewing area, part between display panel edge and border, viewing area is non-display area P, be provided with driving circuit 1 at non-display area P, the functional pin being connected with described driving circuit, in described viewing area A, comprise several pixel cells, each pixel cell can receive display (while normally work) or the detection signal (when panel detection) from driving circuit 1 by corresponding liner, described liner is corresponding one by one with the functional pin in driving circuit 1, also be that each liner can find its pin of correspondence in driving circuit 1.In the present embodiment, on described display panel, be reserved with and enable to control liner 101 and two test pads 102 and 103, can described display panel sends the described enable signal receiving to described driving circuit by the described liner that enables, and then control described external signal and transfer to described display panel inside.It should be noted that just driving circuit shown in Fig. 2 a needs trigistor 122 and 123 conductings simultaneously could realize external signal and imports described display panel inside into.
In the present embodiment, described driving circuit and described display panel are engaging (realizing electrical connection) before, respectively described driving circuit and display panel are detected, whether the pixel cell for example detecting in described display panel can normally be lighted in the situation that meeting ignition condition, described driving circuit and display panel after qualified detection are engaged, module after engaging is detected again, use external probe in reserved test pads 102 and 103, to import detection signal on described display panel, described module to be detected is detected, when module after discovery engages occurs that product is bad, in described display panel, reserved enabling inputted enable signal in liner 101, described enable signal is transferred in described driving circuit by enabling liner 101, control corresponding function pin in described driving circuit in high-impedance state, make described driving circuit and display panel disconnect electrical connection, just can detect respectively described driving circuit and display panel, the problem of display panel or the problem of driving circuit and do not need driving circuit to detect respectively again after display panel is taken off cleaning.
In the present embodiment, described driving circuit and display panel can be identical with engaging rear trace routine used before engaging.
In the present embodiment, also provide a kind of display device, comprised the display panel described in above any one embodiment.Preferably, described display device can be liquid crystal indicator, comprises above-mentioned display panel and back light unit, can certainly be other display device.
Driving circuit, display panel and the display device of the display panel that first embodiment of the invention provides, control functional pin and realize signal transmission or present high-impedance state by a trigistor is set in control circuit.Thus, if find that product is bad after driving circuit and display panel are engaged, can disconnect the connection of driving circuit and display panel, after described driving circuit and display panel are detected respectively, the source of failure judgement, has reduced testing cost and has simplified trace routine.
Figure 3 illustrates the second embodiment of the present invention.
Second embodiment of the invention is the driving circuit about display panel, and described driving circuit comprises: functional pin, for connecting corresponding external circuit to realize predetermined function; Control circuit, for making described functional pin realize signal transfer functions or presenting high-impedance state under the control of enable signal.Fig. 3 is according to the schematic diagram of the driving circuit of second embodiment of the invention, as shown in Figure 3, driving circuit 2 comprises functional pin 21 and control circuit corresponding thereto 22, wherein, functional pin 21 can comprise input pin 211, output pin 212 and unsettled pin 213, and control circuit 22 can comprise processing module 221 and trigistor.In the present embodiment, still describe as an example of two trigistors 222 and 223 example.
It will be understood by those skilled in the art that driving circuit 2 described herein is only for explaining the present invention, but not limitation of the invention.The number of input pin 211, output pin 212 and unsettled pin 213 in functional pin 21 used is not only defined in 1, control circuit 22 not only includes processing module 221 and two trigistors 222 and 223, the present embodiment is a preferred embodiment, and all existing driving circuits all can be applicable to the present invention.
In the present embodiment, functional pin 21 connects corresponding external circuit to realize predetermined function, input pin 211 is for inputting external signal described driving circuit, output pin 212 drives described display panel signal for exporting, and unsettled pin 213 can be for being arranged to vacant state by pin unnecessary in driving circuit.
Described control circuit for making functional pin 21 realize signal transfer functions or present high-impedance state under the control of enable signal.In the time that functional pin 21 presents high-impedance state, described driving circuit and display panel disconnect.
Comprise that taking described control circuit trigistor 222 and 223 is as example, trigistor 222 comprises Enable Pin 2221, first signal end 2222 and secondary signal end 2223, wherein, input pin 211 in first signal end 2222 linkage function pins 21, secondary signal end 2223 connects processing module 221, Enable Pin 2221 receives described enable signal, and according to whether realizing signal transmission between functional pin described in described enable signal control and described processing module, whether also control described external signal can be realized and be transferred to processing module 221 by functional pin, in the present embodiment, described processing module comprises the circuit that drives described display panel to show, circuit in described processing module includes, but are not limited to timing circuit, operational amplification circuit, reset circuit, media transmission protocol circuit and dynamic backlight control driving circuit etc., the internal circuit configuration difference of the processing module in different driving circuit, except realizing signal transmission, also can be according to different objects, circuit structure is realized different functions, specifically can carry out physical circuit design to processing module 221 according to needs.Because the physical circuit of described processing module is not emphasis of the present invention, therefore do not launch in detail at this.In like manner, trigistor 223 comprises Enable Pin 2231, first signal end 2232 and secondary signal end 2233, wherein, and the output pin 212 in first signal end 2232 linkage function pins 21, secondary signal end 2233 connects processing module 221, and Enable Pin 2231 receives described enable signal.
Alternatively, described trigistor is transistor, wherein said Enable Pin is described transistorized base stage, described first signal end is described transistorized collector (or emitter, according to transistorized type judgement), and described secondary signal end is described transistorized emitter (or collector, according to transistorized type judgement).
Specifically alternatively, in the time that described transistor is NPN type, if at Enable Pin input low level, the base voltage that is described NPN transistor is zero, now base current is also zero, described NPN transistor is operated in cut-off region, make described functional pin in high-impedance state, the signal that makes to be connected in the input pin 211 in the functional pin 21 of first signal end cannot be inputted, now, driving circuit 2 is equivalent to suspended state, disconnect and being electrically connected with described display panel, when described display panel after engaging and driving circuit find that product is bad, can detect respectively described display panel and driving circuit, and do not need by described driving circuit from display panel take off clean after more respectively detect, if at Enable Pin input high level, base stage has electric current to flow through, now NPN transistor is operated in zone of saturation, therefore described first signal end flows through larger amplified current, the signal that makes to be connected in the input pin 211 in the functional pin 21 of described first signal end can be inputted, and realizes signal transmission between described functional pin and described processing module.
Specifically alternatively, described transistor can be also positive-negative-positive, because the circuit of positive-negative-positive is contrary with NPN type circuit, therefore, when at Enable Pin input high level, described PNP transistor cut-off, makes described functional pin in high-impedance state, in the time that described enable signal is low level, makes to realize signal between described functional pin and described control module and transmit.Shown in Fig. 3, in driving circuit, in the time of trigistor 222 and 223 conducting simultaneously, described external signal can be imported in described display panel.
In the present embodiment, also provide a kind of display device, comprised the display panel described in above any one embodiment.Preferably, described display device can be liquid crystal indicator, comprises above-mentioned display panel and back light unit, can certainly be other display device.
Driving circuit, display panel and the display device of the display panel that second embodiment of the invention provides, control functional pin by a trigistor and realize signal transmission or present high-impedance state.Thus, if find that product is bad after driving circuit and display panel are engaged, can disconnect the connection of driving circuit and display panel, after described driving circuit and display panel are detected respectively, the source of failure judgement, has reduced testing cost and has simplified trace routine.
In Fig. 4 b, the third embodiment of the present invention is shown at Fig. 4 a.
Third embodiment of the invention is the driving circuit about display panel, and described driving circuit comprises: functional pin, for connecting corresponding external circuit to realize predetermined function; Control circuit, for making described functional pin realize signal transfer functions or presenting high-impedance state under the control of enable signal.Fig. 4 a is according to the schematic diagram of the driving circuit of third embodiment of the invention, as shown in Fig. 4 a, driving circuit 3 comprises functional pin 31 and control circuit corresponding thereto 32, wherein, functional pin 31 can comprise input pin 311, output pin 312 and unsettled pin 313, and control circuit 32 can comprise trigistor 321.
It will be understood by those skilled in the art that driving circuit 3 described herein is only for explaining the present invention, but not limitation of the invention.The number of input pin 311, output pin 312 and the unsettled pin 313 of functional pin 31 used is not only defined in 1, and the present embodiment is a preferred embodiment, and all existing driving circuits all can be applicable to the present invention.
In the present embodiment, functional pin 31 connects corresponding external circuit to realize predetermined function, described predetermined function refers to the function corresponding with external circuit, described predetermined function includes, but are not limited to trigger voltage input, bias voltage input, ground connection, mu balanced circuit control Voltage-output, cross current control voltage input end and the input of on/off control voltage etc., input pin 311 is for inputting external signal described driving circuit, input pin 311 includes, but are not limited to grounding pin, power supply input pin and reset input pin etc., output pin 312 is for exporting the signal that drives described display panel, wherein, output pin 312 includes, but are not limited to grounding pin, latch output pin and reset output pin etc.Preferably, corresponding one by one in input pin 311 and output pin 312 functions.Wherein, unsettled pin 313 can be used for pin unnecessary in driving circuit to be arranged to vacant state.
Described control circuit for making functional pin 31 realize signal transfer functions or present high-impedance state under the control of enable signal.In the time that functional pin 31 presents high-impedance state, described driving circuit and display panel disconnect, and described external signal can not be transferred in described display panel and go.
Preferably, described control circuit is trigistor 321, described trigistor comprises Enable Pin 3211, first signal end 3212 and secondary signal end 3213, wherein, input pin 311 in first signal end 3212 linkage function pins 31, output pin 312 in secondary signal end 3213 linkage function pins 31, Enable Pin 3211 receives described enable signal, and according to signal transmission between input pin described in described enable signal control and output pin, also control described external signal and whether can output to output pin 312 from input pin 311.
Alternatively, described trigistor is metal-oxide-semiconductor, wherein said Enable Pin is the grid of described metal-oxide-semiconductor, drain electrode (or the source electrode that described first signal end is described metal-oxide-semiconductor, according to the type decision of metal-oxide-semiconductor), and the source electrode that described secondary signal end is described metal-oxide-semiconductor (or drain electrode, according to the type decision of metal-oxide-semiconductor).
Specifically alternatively, described metal-oxide-semiconductor can be PMOS pipe, in the time that described Enable Pin signal is high level, the cut-off of described PMOS pipe, make described functional pin in high-impedance state, in the time that described Enable Pin signal is low level, the conducting of described PMOS pipe, makes to realize signal between described input pin and output pin and transmits.
In the time that described trigistor is PMOS pipe, if in the time of described Enable Pin input high level, the cut-off of described PMOS pipe, makes described functional pin in high-impedance state, now, driving circuit is equivalent to suspended state, disconnects and being electrically connected, when the display panel after engaging and driving circuit find that product is bad with display panel, can distinguish detection display panel and driving circuit, determine the source of fault, and do not need driving circuit to take off from display panel, avoided loaded down with trivial details processing.
Specifically alternatively, described metal-oxide-semiconductor can be also NMOS pipe, in the time that described enable signal is low level, the cut-off of described NMOS pipe, make described functional pin in high-impedance state, in the time that described enable signal is high level, the conducting of described NMOS pipe, makes to realize signal between described input pin and output pin and transmits.
Equally, when described trigistor is NMOS pipe, when at Enable Pin input low level, the cut-off of described NMOS pipe, make described functional pin in high-impedance state, now, driving circuit is equivalent to suspended state, disconnects and being electrically connected with display panel, when display panel after engaging and driving circuit find that product is bad, can distinguish detection display panel and driving circuit, determine the source of fault, and do not need driving circuit to clean after display panel is taken off.
Fig. 4 b is according to the schematic diagram of the display panel of first embodiment of the invention, as shown in Figure 4 b, this display panel comprises the non-display area P of viewing area A and periphery, viewing area, part between display panel edge and border, viewing area is non-display area P, be provided with driving circuit 3 at non-display area P, the functional pin being connected with described driving circuit, in described viewing area A, comprise several pixel cells, each pixel cell can receive display (while normally work) or the detection signal (when panel detection) from driving circuit 3 by corresponding liner, described liner is corresponding one by one with the functional pin in driving circuit 3, also be that each liner can find its pin of correspondence in driving circuit 3.In the present embodiment, on described display panel, be reserved with and enable to control liner 301 and two test pads 302 and 303, can described display panel sends described enable signal to described driving circuit by the described liner that enables, and then control described external signal and transfer to described display panel inside.
In the present embodiment, described driving circuit and described display panel are engaging (realizing electrical connection) before, respectively described driving circuit and display panel are detected, described driving circuit and display panel after qualified detection are engaged, module after engaging is detected, use external probe in reserved test pads 302 and 303, to import detection signal on described display panel, described module to be detected is detected, when module after discovery engages occurs that product is bad, in liner 301, input enable signal to reserved enabling in described display panel, described enable signal is transferred in described driving circuit by enabling liner 301, control functional pin in described driving circuit in high-impedance state, make described driving circuit and display panel disconnect electrical connection, just can detect respectively described driving circuit and display panel, the problem of display panel or the problem of driving circuit and do not need driving circuit to detect respectively again after display panel is taken off cleaning.
In the present embodiment, described driving circuit and display panel can be identical with engaging rear trace routine used before engaging.
In the present embodiment, also provide a kind of display device, comprised the display panel described in above any one embodiment.Preferably, described display device can be liquid crystal indicator, comprises above-mentioned display panel and back light unit, can certainly be other display device.
Driving circuit, display panel and the display device of the display panel that third embodiment of the invention provides, connect corresponding external circuit to realize predetermined function by functional pin, realize signal transfer functions or present high-impedance state by functional pin described in enable signal control, in the time that described functional pin presents high-impedance state, described driving circuit disconnects and being electrically connected with display panel.Thus, if find that product is bad after driving circuit and display panel are engaged, can disconnect the connection of driving circuit and display panel, described driving circuit and display panel are detected respectively to rear decision problem place, and without driving circuit is taken off detecting after driving circuit cleaning from display panel, reduced testing cost and simplified trace routine.
Figure 5 illustrates the fourth embodiment of the present invention.
Fourth embodiment of the invention is the driving circuit about display panel, and described driving circuit comprises: functional pin, for connecting corresponding external circuit to realize predetermined function; Control circuit, for making described functional pin realize signal transfer functions or presenting high-impedance state under the control of enable signal.Fig. 5 is according to the schematic diagram of the driving circuit of fourth embodiment of the invention, as shown in Figure 5, driving circuit 4 comprises functional pin 41 and control circuit 42, wherein, functional pin 41 can comprise input pin 411, output pin 412 and unsettled pin 413, and control circuit 42 can comprise trigistor 421.
It will be understood by those skilled in the art that driving circuit 4 described herein is only for explaining the present invention, but not limitation of the invention.The number of input pin 411, output pin 412 and the unsettled pin 413 of functional pin 41 used is not only defined in 1, and the present embodiment is a preferred embodiment, and all existing driving circuits all can be applicable to the present invention.
In the present embodiment, functional pin 41 connects corresponding external circuit to realize predetermined function, described predetermined function refers to the function corresponding with external circuit, described predetermined function includes, but are not limited to trigger voltage input, bias voltage input, ground connection, mu balanced circuit control Voltage-output, cross current control voltage input end and the input of on/off control voltage etc., input pin 411 is for inputting external signal described driving circuit, input pin 411 includes, but are not limited to grounding pin, power supply input pin and reset input pin etc., output pin 412 is for exporting the signal that drives described display panel, wherein, output pin 412 includes, but are not limited to grounding pin, latch output pin and reset output pin etc.Preferably, corresponding one by one in input pin 411 and output pin 412 functions.Wherein, unsettled pin 413 can be used for pin unnecessary in driving circuit to be arranged to vacant state.
Described control circuit for making functional pin 41 realize signal transfer functions or present high-impedance state under the control of enable signal.In the time that functional pin 41 presents high-impedance state, described driving circuit and display panel disconnect.
Preferably, described control circuit comprises trigistor 421, trigistor 421 comprises Enable Pin 4211, first signal end 4212 and secondary signal end 4213, wherein, input pin 411 in first signal end 4212 linkage function pins 41, output pin 412 in secondary signal end 4213 linkage function pins 41, Enable Pin 4211 receives described enable signal, and according to signal transmission between input pin described in described enable signal control and output pin, also control described external signal and whether can output to output pin 412 from input pin 411.
Alternatively, described trigistor is transistor, wherein said Enable Pin is described transistorized base stage, described first signal end is described transistorized collector (or emitter, according to transistorized type judgement), and described secondary signal end is described transistorized emitter (or collector, according to transistorized type judgement).
Specifically alternatively, described transistor can be NPN transistor, in the time that described transistor is NPN type, if at Enable Pin 4211 input low levels, the base voltage that is described NPN transistor is zero, now base current is also zero, described NPN transistor is operated in cut-off region, make described functional pin in high-impedance state, the signal that makes to be connected in the input pin 411 in the functional pin 41 of described first signal end cannot be inputted, now, driving circuit 4 is equivalent to suspended state, disconnect and being electrically connected with described display panel, when described display panel after engaging and driving circuit find that product is bad, can detect respectively described display panel and driving circuit, and do not need by described driving circuit from display panel take off clean after more respectively detect, if at Enable Pin input high level, base stage has electric current to flow through, now NPN transistor is operated in zone of saturation, therefore described first signal end flows through larger amplified current, the signal that makes to be connected in the input pin 411 in the functional pin 41 of described first signal end can be input to output pin 412 by described external signal, makes described functional pin realize signal transmission.
Specifically alternatively, described transistor can be also positive-negative-positive, because the circuit of positive-negative-positive is contrary with NPN type circuit, therefore, when at Enable Pin input high level, described PNP transistor cut-off, makes described functional pin in high-impedance state, in the time that described enable signal is low level, makes to realize signal between described input and output pin and transmit.
In the present embodiment, also provide a kind of display device, comprised the display panel described in above any one embodiment.Preferably, described display device can be liquid crystal indicator, comprises above-mentioned display panel and back light unit, can certainly be other display device.
Driving circuit, display panel and the display device of the display panel that fourth embodiment of the invention provides, control functional pin by a trigistor and realize signal transmission or present high-impedance state.Thus, if find that product is bad after driving circuit and display panel are engaged, can disconnect the connection of driving circuit and display panel, after described driving circuit and display panel are detected respectively, the source of failure judgement, has reduced testing cost and has simplified trace routine.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection scope of the present invention.Therefore, although the present invention is described in further detail by above embodiment, the present invention is not limited only to above embodiment, in the situation that not departing from the present invention's design, can also comprise more other equivalent embodiment, and scope of the present invention is determined by appended claim scope.
Claims (11)
1. a driving circuit for display panel, is characterized in that, described driving circuit comprises:
Functional pin, for connecting corresponding external circuit to realize predetermined function;
Control circuit, for making described functional pin realize signal transfer functions or presenting high-impedance state under the control of enable signal.
2. the driving circuit of display panel according to claim 1, is characterized in that, described functional pin comprises: input pin, output pin and unsettled pin.
3. the driving circuit of display panel according to claim 1, is characterized in that, described control circuit comprises trigistor and processing module, and described trigistor comprises Enable Pin, first signal end and secondary signal end, wherein
Described first signal end connects described functional pin, and described secondary signal end connects described processing module, and described Enable Pin receives described enable signal, and according to whether realizing signal transmission between functional pin described in described enable signal control and described processing module.
4. the driving circuit of display panel according to claim 1, it is characterized in that, described control circuit comprises trigistor, and described trigistor comprises Enable Pin, first signal end and secondary signal end, and described functional pin comprises input pin, output pin and unsettled pin;
Wherein, described first signal end connects described input pin, and described secondary signal end connects described output pin, and described Enable Pin receives described enable signal, and according to the signal transmission between input pin described in described enable signal control and output pin.
5. according to the driving circuit of the display panel described in claim 3 or 4, it is characterized in that, the trigistor of described control circuit is metal-oxide-semiconductor, wherein, described Enable Pin is the grid of described metal-oxide-semiconductor, the drain electrode that described first signal end is described metal-oxide-semiconductor, and the described secondary signal end source electrode that is described metal-oxide-semiconductor.
6. the driving circuit of display panel according to claim 5, is characterized in that,
Described metal-oxide-semiconductor is PMOS pipe, and in the time that described enable signal is high level, described metal-oxide-semiconductor cut-off, makes described functional pin in high-impedance state, and in the time that described enable signal is low level, described metal-oxide-semiconductor conducting, makes described functional pin realize signal transmission, or
Described metal-oxide-semiconductor is NMOS pipe, and in the time that described enable signal is low level, described metal-oxide-semiconductor cut-off, makes described functional pin in high-impedance state, and in the time that described enable signal is high level, described metal-oxide-semiconductor conducting, makes described functional pin realize signal transmission.
7. according to the driving circuit of the display panel described in claim 3 or 4, it is characterized in that, the trigistor of described control circuit is transistor, wherein said Enable Pin is described transistorized base stage, described first signal end is described transistorized collector, and described secondary signal end is described transistorized emitter.
8. the driving circuit of display panel according to claim 7, is characterized in that,
Described transistor is NPN type, and in the time that described enable signal is low level, described transistor cut-off, makes described functional pin in high-impedance state, and in the time that described enable signal is high level, described transistor turns, makes described functional pin realize signal transmission, or
Described transistor is positive-negative-positive, and in the time that described enable signal is high level, described transistor cut-off, makes described functional pin in high-impedance state, in the time that described enable signal is low level, makes described functional pin realize signal transmission.
9. the driving circuit of display panel according to claim 1, is characterized in that, described display panel comprises that one enables liner, and described display panel sends described enable signal to described control circuit by the described liner that enables.
10. a display panel, is characterized in that, comprises driving circuit as claimed in any one of claims 1-9 wherein.
11. 1 kinds of display device, is characterized in that, comprise display panel as claimed in claim 10.
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| CN201310724515.1A CN103927956B (en) | 2013-12-24 | 2013-12-24 | Drive circuit of display panel, display panel and display device |
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