CN103869201B - A kind of interface connects off normal detecting and protection circuit - Google Patents
A kind of interface connects off normal detecting and protection circuit Download PDFInfo
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- CN103869201B CN103869201B CN201210531874.0A CN201210531874A CN103869201B CN 103869201 B CN103869201 B CN 103869201B CN 201210531874 A CN201210531874 A CN 201210531874A CN 103869201 B CN103869201 B CN 103869201B
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Abstract
The invention discloses a kind of interface and connect off normal detecting and protection circuit, described circuit includes detecting indicating module, control module and power switching module；Described detecting indicating module is connected with off normal detecting port, for according to connecting the signal detection of off normal detecting port and indicating appearance to connect off normal；Described control module is connected with off normal detecting port, keeps power supply to disconnect for controlling power switching module when there is connecting off normal；Described power switching module is connected with described control module, is off-state under default condition, keeps power supply to disconnect for the control according to control module；Wherein, described off normal detecting port is connected with by the independent grounding end of protection interface.The present invention can reduce liquid crystal display module or panel in application or test process because occurring that connecting off normal causes device or injury probability.
Description
Technical field
The present invention relates to liquid crystal display manufacturing technology field, particularly relate to a kind of interface and connect off normal detecting and protection circuit.
Background technology
Lcd technology owing to its thickness is little, low in energy consumption, be prone to the advantage such as coloration and be widely used in consumption electronic product.Along with the picture element density of liquid crystal display module is increasing, it controls complexity is also increasing, thus cause the interface between liquid crystal display module and display driver circuit, and the port number/density of the interface between display panels and lcd drive chip and wiring density are greatly increased.The height secret emissary of port must manufacture and in test process the connection off normal phenomenon of interface more and more universal.Connection off normal inevitably results in high voltage port and is connected on the port of mistake, it will usually causes the glass electrode burn of liquid crystal panel or causes the port failure of drive circuit.
Summary of the invention
The technical problem to be solved is to provide a kind of interface and connects off normal detecting and protection circuit, reduces liquid crystal display module or panel in application or test process because occurring that connecting off normal causes device or injury probability.
The invention discloses a kind of interface and connect off normal detecting and protection circuit, described circuit includes detecting indicating module, control module and power switching module；
Described detecting indicating module is connected with off normal detecting port, for according to connecting the signal detection of off normal detecting port and indicating appearance to connect off normal；
Described control module is connected with off normal detecting port, keeps disconnecting with interface power for controlling power switching module when there is connecting off normal；
Described power switching module is connected with described control module, is off-state under default condition, for the off-state controlling holding and interface power according to control module；
Wherein, described off normal detecting port is connected with by the independent grounding end of protection interface.
Preferably, described power switching module includes input, outfan and control end；
Described input is connected to power supply；
Described outfan is connected to by the power input of protection interface；
Described control end is connected with described control module.
Preferably, described detecting indicating module includes detecting power end, and, it is connected in detecting power end and the light emitting diode connected between off normal detecting port and resistance in parallel.
Preferably, whether described control module is that high level judges whether occur connecting off normal according to described off normal detecting port voltage.
Preferably, described control module makes, for the output when off normal detecting port is low level, the control signal that power switching module turns on, and when off normal detecting port is high level, output makes the control signal that power switching module remains open.
Preferably, described control module includes P-channel field-effect transistor (PEFT) pipe and N-channel field effect transistor；
Wherein, the grid of described P-channel field-effect transistor (PEFT) pipe is connected with off normal detecting port, and the source electrode of described P-channel field-effect transistor (PEFT) pipe is connected with control module power supply, and the drain electrode of described P-channel field-effect transistor (PEFT) pipe is connected with the grid of described N-channel field effect transistor；
The grid of described N-channel field effect transistor passes through divider resistance ground connection；The source ground of described N-channel field effect transistor；The drain electrode of described N-channel field effect transistor is connected output control signal with described power switching module.
Preferably, described control module also includes first electric capacity in parallel with divider resistance and is connected to the second electric capacity between described P-channel field-effect transistor (PEFT) tube grid and ground.
Preferably, described is the interface between lcd drive chip and liquid crystal panel by protection interface；Or
Described is the interface between liquid crystal display module and display driver circuit by protection interface.
Preferably, the arbitrary or a combination thereof during described interface power is the backlight electric power of liquid crystal display module, analog circuit power supply, digital circuit power source.
Preferably, the arbitrary or a combination thereof during described interface power is the backlight electric power of liquid crystal panel, analog circuit power supply, digital circuit power source.
The present invention detects Port detecting by the voltage of protection interface independent grounding end by off normal; when the electric voltage exception that off normal detecting port detects; power switching module is driven to cut off the power supply powered to interface; can find that the circuit connecting interface connection off normal phenomenon the connection of docking port two ends of liquid crystal display module or display panels is protected in time, greatly reduce liquid crystal display module or panel in application or test process because occurring that connecting off normal causes device or injury probability.
Accompanying drawing explanation
Fig. 1 is that the interface of first embodiment of the invention connects off normal detecting and the structural representation of protection circuit；
Fig. 2 is that the interface of second embodiment of the invention connects off normal detecting and the structural representation of protection circuit；
Fig. 3 is that the interface of third embodiment of the invention connects off normal detecting and the structural representation of protection circuit.
Detailed description of the invention
Further illustrate technical scheme below in conjunction with the accompanying drawings and by detailed description of the invention.
Fig. 1 is that the interface of first embodiment of the invention connects off normal detecting and the structural representation of protection circuit.As it is shown in figure 1, interface connects off normal detecting and protection circuit 10 includes detecting indicating module 11, control module 12 and power switching module 13.
Detecting indicating module 11 is connected with off normal detecting port 14, for according to connecting the signal detection of off normal detecting port 14 and indicating appearance to connect off normal.
Control module 12 is connected with off normal detecting port 14, keeps interface power to disconnect for controlling power switching module 13 when there is connecting off normal.
Described power switching module 13 is connected with control module 12, is off-state under default condition, disconnects with interface power for the control holding according to control module 12.
Wherein, off normal detecting port 14 is connected with by the independent grounding end of protection interface.
It is connected with peripheral circuit at liquid crystal display module; or when liquid crystal panel is connected with drive circuit; if after independent grounding ports series resistance is applied voltage; due to when there is connecting off normal in interface; high-tension port would generally partial dislocation be received in I/O port, thus causes the independent grounding end of interface having high voltage.And independent grounding end can be in low-voltage state under normal connection.Therefore, it can by this characteristic whether occurring that connecting off normal detects.
And, it being relatively easy to find or design as detecting object using independent grounding end, in general connectivity port, the number on ground is more, and this independent port is used for drawing, as detecting, the electric connection that angle does not interferes with between module and miscellaneous equipment not as the function on ground.
Thus; the present embodiment utilizes off normal detecting port to detect by the voltage condition of the independent grounding end of protection interface; appearance by detecting indicating module instruction off normal; interface power is kept to be disconnected by control module and power switching module when connecting off normal and occurring, it is to avoid to cause owing to connecting off normal liquid crystal display module/liquid crystal panel or connected circuit are caused damage.
Fig. 2 is that the interface of second embodiment of the invention connects off normal detecting and the structural representation of protection circuit.As in figure 2 it is shown, interface connects off normal detecting and protection circuit 20 includes detecting indicating module 21, control module 22 and power switching module 23.
Detecting indicating module 21 is connected with off normal detecting port 24, for according to connecting the signal detection of off normal detecting port 24 and indicating appearance to connect off normal.Off normal detecting port 24 is connected with by the independent grounding end of protection interface.
Detecting indicating module 21 includes detecting power end 211 and circuit for detecting, and circuit for detecting includes light emitting diode 212 and the shunt resistance 213 of parallel connection.
Owing to interface connects off normal detecting and protection circuit 20 shunt resistance 213, off normal detecting port 24 being applied voltage, when normally being connected by protection interface, the voltage of off normal detecting port 24 is low level, and LEDs ON is luminous, indicates normal by protection interface.
When being there is connecting off normal by protection interface, after the circuit that interface is connected powers on, the voltage of off normal detecting port 24 is high level, and light emitting diode cut-off is extinguished, and instruction is broken down by protection interface.
Control module 22 is connected with off normal detecting port 24, keeps interface power to be disconnected for controlling power switching module 23 when there is connecting off normal.Wherein, power switching module 23 is in default condition bottom off-state, control module 22 output when off normal detecting port is low level makes the control signal that power switching module 23 turns on, and when off normal detecting port is high level, output makes the control signal that power switching module 23 remains open.
It will be appreciated by those skilled in the art that, control module 22 can be adopted and be realized in various manners, such as utilize the discrete devices such as transistor/field effect transistor to be combined, or use single-chip microcomputer (MCU), CPLD (CPLD), field programmable logic array (FPGA) or special IC (ASIC) to realize.Meanwhile, control module 22 can also together be designed to be fabricated to the form use of special IC with power switching module 23.
The control end of described power switching module 23 is connected with control module 22, and it is in default condition bottom off-state, for cutting off the electricity supply according to the control of control module 22.
In the present embodiment, described power switching module 23 includes input 231, outfan 232 and controls end 233；Input 231 is connected to interface power；Outfan 232 is connected to by the power input of protection interface；Control end 233 to be connected with control module 22, open according to the control signal of control module 22 or be kept switched off the electrical connection between input 231 and outfan 233.
In a preferred implementation of the present embodiment, power switching module 23 uses integrated circuit relay to coordinate peripheral circuit to constitute.Certainly, it will be understood by those skilled in the art that and single-chip microcomputer (MCU), CPLD (CPLD), field programmable logic array (FPGA) or special IC (ASIC) can be used to realize its function.Meanwhile, control module 22 can also together be designed to be fabricated to the form use of special IC with power switching module 23.
Fig. 3 is that the interface of third embodiment of the invention connects off normal detecting and the structural representation of protection circuit.As it is shown on figure 3, the present embodiment uses discrete device/integrated circuit to constitute interface connects off normal detecting and protection circuit 30.Interface connection off normal detecting and protection circuit 30 include utilizing light emitting diode 312 in parallel and shunt resistance 313 and detecting the detecting indicating module 31 that power end 311 is constituted；Utilize the power switching module 33 that integrated circuit relay OMRONG5V-1 is constituted, and include the control module 32 of two field-effect transistors.
Control module 32 includes P-channel field-effect transistor (PEFT) pipe 321 and N-channel field effect transistor 322；
Wherein, the grid of P-channel field-effect transistor (PEFT) pipe 321 is connected with off normal detecting port, source electrode connects with control module power supply (in the present embodiment, control module power supply uses identical power supply with detecting power supply), and drain electrode is connected with the grid of described N-channel field effect transistor 322.
The grid of N-channel field effect transistor 322 passes through divider resistance 323 ground connection；Its source ground；The drain electrode of N-channel field effect transistor 322 is connected output control signal with power switching module 33.
Control module 32 also includes first electric capacity 324 in parallel with divider resistance 323 and the second electric capacity 325 being connected between described P-channel field-effect transistor (PEFT) pipe 321 grid and ground.First electric capacity 324 and the second electric capacity 325 are used for preventing voltage from changing suddenly and circuit devcie are constituted damage, and In some embodiments of the present invention, first, second electric capacity 324 and 325 can omit.
Certainly, it will be appreciated by those skilled in the art that, the circuit form that control module can use is not limited to the circuit that the present embodiment is illustrated, and it can use any realization output when off normal detecting port high voltage being detected to control the circuit of the control signal that power module is cut off the electricity supply.Simultaneously, control module both can use discrete component to connect and compose as described in this enforcement, it is possible to use single-chip microcomputer (MCU), CPLD (CPLD), field programmable logic array (FPGA) or special IC (ASIC) realize.Meanwhile, control module 22 can also together be designed to be fabricated to the form use of special IC with power switching module 23.
The present embodiment may be used for protecting the external interface of plurality of liquid crystals display module or panel, with off normal detecting port, the independent grounding port in interface is connected detecting and connects off normal phenomenon, it is thus achieved that good result.Wherein when the glass of display panels being walked line interface and protecting, glass cabling burns fraction defective and is dropped to 0% by original 1.94%.
The present embodiment detects Port detecting by the voltage of protection interface independent grounding end by off normal; when the electric voltage exception that off normal detecting port detects; power switching module is driven to cut off the power supply powered to interface; can find that the circuit connecting interface connection off normal phenomenon the connection of docking port two ends of liquid crystal display module or display panels is protected in time, greatly reduce liquid crystal display module or panel in application or test process because occurring that connecting off normal causes device or injury probability.
Interface described in above-described embodiment connects off normal detecting and protection circuit may be used for protecting the interface between lcd drive chip and liquid crystal panel, it is also possible to be used for protecting liquid crystal display module and peripheral circuit, such as, the interface between display driver circuit.
Meanwhile, the power supply that in above-described embodiment, power switching module is controlled can be the backlight electric power of liquid crystal display, analog circuit power supply, digital circuit power source thrin or a combination thereof.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, to those skilled in the art, the present invention can have various change and change.All any modification, equivalent substitution and improvement etc. made within spirit and principles of the present invention, should be included within the scope of the present invention.
Claims (10)
1. interface connects off normal detecting and a protection circuit, and described circuit includes detecting indicating module, control module and power switching module；
Described detecting indicating module is connected with off normal detecting port, for according to connecting the signal detection of off normal detecting port and indicating appearance to connect off normal；
Described control module is connected with off normal detecting port, keeps disconnecting with interface power for controlling power switching module when there is connecting off normal；
Described power switching module is connected with described control module, is off-state under default condition, for the off-state controlling holding interface power according to control module；
Wherein, described off normal detecting port is connected with by the independent grounding end of protection interface.
Interface the most according to claim 1 connects off normal detecting and protection circuit, it is characterised in that described power switching module includes input, outfan and control end；
Described input is connected to interface power；
Described outfan is connected to by the power input of protection interface；
Described control end is connected with described control module.
Interface the most according to claim 1 connects off normal detecting and protection circuit, it is characterised in that described detecting indicating module includes detecting power end, and, it is connected in power end and the light emitting diode connected between off normal detecting port and shunt resistance in parallel.
Interface the most according to claim 1 connects off normal detecting and protection circuit, it is characterised in that whether described control module is that high level judges whether occur connecting off normal according to described off normal detecting port voltage.
Interface the most according to claim 4 connects off normal detecting and protection circuit; it is characterized in that; described control module makes, for the output when off normal detecting port is low level, the control signal that power switching module turns on, and when off normal detecting port is high level, output makes the control signal that power switching module remains open.
Interface the most according to claim 5 connects off normal detecting and protection circuit, it is characterised in that described control module includes P-channel field-effect transistor (PEFT) pipe and N-channel field effect transistor；
Wherein, the grid of described P-channel field-effect transistor (PEFT) pipe is connected with off normal detecting port, and the source electrode of described P-channel field-effect transistor (PEFT) pipe is connected with control module power supply, and the drain electrode of described P-channel field-effect transistor (PEFT) pipe is connected with the grid of described N-channel field effect transistor；
The grid of described N-channel field effect transistor passes through divider resistance ground connection；The source ground of described N-channel field effect transistor；The drain electrode of described N-channel field effect transistor is connected output control signal with described power switching module.
Interface the most according to claim 6 connects off normal detecting and protection circuit, it is characterised in that described control module also includes first electric capacity in parallel with divider resistance and is connected to the second electric capacity between described P-channel field-effect transistor (PEFT) tube grid and ground.
Interface the most according to claim 1 connects off normal detecting and protection circuit, it is characterised in that described is the interface between lcd drive chip and liquid crystal panel by protection interface；Or
Described is the interface between liquid crystal display module and display driver circuit by protection interface.
Interface the most according to claim 1 connects off normal detecting and protection circuit, it is characterised in that described interface power is the arbitrary or a combination thereof in the backlight electric power of liquid crystal display module, analog circuit power supply, digital circuit power source.
Interface the most according to claim 1 connects off normal detecting and protection circuit, it is characterised in that described interface power is the arbitrary or a combination thereof in the backlight electric power of liquid crystal panel, analog circuit power supply, digital circuit power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210531874.0A CN103869201B (en) | 2012-12-11 | 2012-12-11 | A kind of interface connects off normal detecting and protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210531874.0A CN103869201B (en) | 2012-12-11 | 2012-12-11 | A kind of interface connects off normal detecting and protection circuit |
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| CN103869201A CN103869201A (en) | 2014-06-18 |
| CN103869201B true CN103869201B (en) | 2016-08-03 |
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| CN201210531874.0A Active CN103869201B (en) | 2012-12-11 | 2012-12-11 | A kind of interface connects off normal detecting and protection circuit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111613157A (en) * | 2019-02-22 | 2020-09-01 | 咸阳彩虹光电科技有限公司 | Mura repair test method of display panel, display panel and display device |
| CN112130098A (en) * | 2020-09-17 | 2020-12-25 | 上海创功通讯技术有限公司 | Connection detection device, mainboard and terminal |
| CN113341334A (en) * | 2021-06-16 | 2021-09-03 | 西安易朴通讯技术有限公司 | Power failure processing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07264519A (en) * | 1994-03-18 | 1995-10-13 | Casio Comput Co Ltd | Liquid crystal display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201041734Y (en) * | 2006-11-29 | 2008-03-26 | 群康科技(深圳)有限公司 | LCD power supply circuit and LCD |
| CN101730393A (en) * | 2008-10-24 | 2010-06-09 | 奇美电子股份有限公司 | Fixed structure, light-emitting assembly and display device using the same |
| CN201838986U (en) * | 2010-11-02 | 2011-05-18 | 莆田市清华园电器发展有限公司 | Leakage protector |
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Inventor after: Zhou Jingxiong Inventor after: Hu Yinglai Inventor after: Wang Yajie Inventor before: Zhou Jingshui Inventor before: Hu Yinglai Inventor before: Wang Yajie |
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