CN103869201A - Interface connection deviation detecting and protecting circuit - Google Patents
Interface connection deviation detecting and protecting circuit Download PDFInfo
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- CN103869201A CN103869201A CN201210531874.0A CN201210531874A CN103869201A CN 103869201 A CN103869201 A CN 103869201A CN 201210531874 A CN201210531874 A CN 201210531874A CN 103869201 A CN103869201 A CN 103869201A
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000005669 field effect Effects 0.000 claims description 29
- 230000003278 mimic effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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Abstract
本发明公开了一种接口连接偏位侦测和保护电路，所述电路包括侦测指示模块、控制模块和电源开关模块；所述侦测指示模块与偏位侦测端口连接，用于根据连接偏位侦测接口的信号侦测并指示出现连接偏位；所述控制模块与偏位侦测端口连接，用于在出现连接偏位时控制电源开关模块保持电源断开；所述电源开关模块与所述控制模块连接，在缺省条件下为断开状态，用于根据控制模块的控制保持电源断开；其中，所述偏位侦测端口与被保护接口的独立接地端连接。本发明可以降低液晶显示模组或面板在应用或测试过程中因出现连接偏位造成器件或工具损伤几率。
The invention discloses an interface connection deviation detection and protection circuit, the circuit includes a detection indication module, a control module and a power switch module; the detection indication module is connected with a deviation detection port for The signal of the deviation detection interface detects and indicates that the connection deviation occurs; the control module is connected with the deviation detection port, and is used to control the power switch module to keep the power off when the connection deviation occurs; the power switch module It is connected to the control module, and is disconnected by default, and is used to keep the power supply disconnected according to the control of the control module; wherein, the offset detection port is connected to an independent ground terminal of the protected interface. The invention can reduce the possibility of device or tool damage due to connection deviation during the application or test of the liquid crystal display module or panel.
Description
Technical field
The present invention relates to liquid crystal display manufacturing technology field, relate in particular to a kind of interface and connect off normal detecting and holding circuit.
Background technology
Lcd technology is widely used in consumption electronic product because its thickness is little, low in energy consumption, be easy to the advantages such as color.Along with the picture element density of liquid crystal display module is increasing, it controls complexity is also increasing, cause thus the interface between liquid crystal display module and display driver circuit, and port number/density and the wiring density of interface between display panels and lcd drive chip increase greatly.The height secret emissary of port must be in Computer-Assisted Design, Manufacture And Test process the connection off normal phenomenon of interface more and more general.Connect off normal and will inevitably cause high voltage port to be connected on wrong port, conventionally can cause the glass electrode burn of liquid crystal panel or cause the port failure of driving circuit.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of interface and connects off normal detecting and holding circuit, reduces liquid crystal display module or panel and cause device or instrument damage probability because appearance connects off normal in application or test process.
The invention discloses a kind of interface and connect off normal detecting and holding circuit, described circuit comprises detecting indicating module, control module and power switching module;
Described detecting indicating module is connected with off normal detecting port, for there is connecting off normal according to the signal detection the instruction that connect off normal detecting interface;
Described control module is connected with off normal detecting port, keeps disconnecting with interface power supply for control power switching module in the time there is connection off normal;
Described power switching module is connected with described control module, is off-state under default condition, for according to the off-state of the control maintenance of control module and interface power supply;
Wherein, described off normal detecting port is connected with the independent grounding end of protected interface.
Preferably, described power switching module comprises input end, output terminal and control end;
Described input end is connected to power supply;
Described output terminal is connected to the power input of protected interface;
Described control end is connected with described control module.
Preferably, described detecting indicating module comprises detecting power end, and, be connected in detecting power end in parallel and connect light emitting diode and the resistance between off normal detecting interface.
Preferably, whether described control module is that high level judges whether to occur connecting off normal according to described off normal detecting port voltage.
Preferably, described control module makes the control signal of power switching module conducting, the control signal that output remains open power switching module in the time that off normal detecting port is high level for output in the time that off normal detecting port is low level.
Preferably, described control module comprises P-channel field-effect transistor (PEFT) pipe and N channel field-effect pipe;
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 pipe;
The grid of described N channel field-effect pipe is by divider resistance ground connection; The source ground of described N channel field-effect pipe; The drain electrode of described N channel field-effect pipe is connected output control signal with described power switching module.
Preferably, described control module also comprises 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 protected interface is the interface between lcd drive chip and liquid crystal panel; Or
Described protected interface is the interface between liquid crystal display module and display driver circuit.
Preferably, arbitrary or its combination in described interface power supply is liquid crystal display module backlight electric power, mimic channel power supply, digital circuit power source.
Preferably, arbitrary or its combination in described interface power supply is liquid crystal panel backlight electric power, mimic channel power supply, digital circuit power source.
The present invention detects the voltage of the protected interface independent grounding of Port detecting end by off normal; detect at off normal detecting port electric voltage exception time; driving power switch module cuts off to the power supply of interface power supply; the connecting interface that can find in time liquid crystal display module or display panels connects the circuit that off normal phenomenon docking port two ends connect to be protected, greatly reduce liquid crystal display module or panel in application or test process because occurring that connecting off normal causes device or instrument damage probability.
Brief description of the drawings
Fig. 1 is the structural representation that the interface of first embodiment of the invention connects off normal detecting and holding circuit;
Fig. 2 is the structural representation that the interface of second embodiment of the invention connects off normal detecting and holding circuit;
Fig. 3 is the structural representation that the interface of third embodiment of the invention connects off normal detecting and holding circuit.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and by embodiment.
Fig. 1 is the structural representation that the interface of first embodiment of the invention connects off normal detecting and holding circuit.As shown in Figure 1, the detecting of interface connection off normal and holding circuit 10 comprise detecting indicating module 11, control module 12 and power switching module 13.
Described power switching module 13 is connected with control module 12, is off-state under default condition, for disconnecting according to the control maintenance of control module 12 and interface power supply.
Wherein, off normal detecting port 14 is connected with the independent grounding end of protected interface.
Be connected with peripheral circuit at liquid crystal display module; or when liquid crystal panel is connected with driving circuit; if grounding ports resistance in series is independently applied after voltage; due in the time that interface occurs connecting off normal; high-tension port is conventionally understood partial dislocation and is received in IO port, causes thus the independent grounding end of interface having high voltage.And independent grounding end can be in low-voltage state under normal connection.Therefore, can detect whether there is connecting off normal by this characteristic.
And, independent grounding end comparatively easily to be found or designed as detecting object, in general connectivity port, the number on ground is more, and this independent port is used for drawing angle instead of can not having influence on the electric connection between module and miscellaneous equipment as the function on ground as detecting.
Thus; the present embodiment utilizes off normal detecting port to detect the voltage condition of the independent grounding end of protected interface; by the appearance of detecting indicating module instruction off normal; keep interface power supply to be disconnected by control module and power switching module being connected when off normal occurs, avoided causing liquid crystal display module/liquid crystal panel or connected circuit being caused to damage owing to connecting off normal.
Fig. 2 is the structural representation that the interface of second embodiment of the invention connects off normal detecting and holding circuit.As shown in Figure 2, the detecting of interface connection off normal and holding circuit 20 comprise 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 there is connecting off normal according to the signal detection the instruction that connect off normal detecting interface 24.Off normal detecting port 24 is connected with the independent grounding end of protected interface.
Detecting indicating module 21 comprises detecting power end 211 and circuit for detecting, and circuit for detecting comprises light emitting diode in parallel 212 and shunt resistance 213.
Because interface connects, off normal is detected and holding circuit 20 shunt resistances 213 apply voltage to off normal detecting port 24, and in the time that protected interface normally connects, the voltage of off normal detecting port 24 is low level, and light emitting diode conducting is luminous, indicates protected interface normal.
In the time that protected interface occurs connecting off normal, after the circuit that interface connects powers on, the voltage of off normal detecting port 24 is high level, and light emitting diode cut-off is extinguished, and indicates protected interface to break down.
Control module 22 is connected with off normal detecting port 24, keeps interface power supply to be disconnected for control power switching module 23 in the time there is connection off normal.Wherein, power switching module 23 is in the next off-state of default condition, control module 22 output in the time that off normal detecting port is low level makes the control signal of power switching module 23 conductings, the control signal that output remains open power switching module 23 in the time that off normal detecting port is high level.
It will be appreciated by those skilled in the art that, control module 22 can adopt variety of way to realize, for example utilize the discrete devices such as transistor/field effect transistor to combine, or use single-chip microcomputer (MCU), CPLD (CPLD), field programmable logic array (FPLA) (FPGA) or special IC (ASIC) to realize.Meanwhile, control module 22 can also together be designed to be fabricated to power switching module 23 the form use of special IC.
The control end of described power switching module 23 is connected with control module 22, and it is in the next off-state of default condition, for cutting off the electricity supply according to the control of control module 22.
In the present embodiment, described power switching module 23 comprises input end 231, output terminal 232 and control end 233; Input end 231 is connected to interface power supply; Output terminal 232 is connected to the power input of protected interface; Control end 233 is connected with control module 22, cuts off the electrical connection between input end 231 and output terminal 233 according to control signal unlatching or the maintenance of control module 22.
In a preferred implementation of the present embodiment, power switching module 23 adopts integrate circuit relay to coordinate peripheral circuit to form.Certainly, it will be understood by those skilled in the art that and can use single-chip microcomputer (MCU), CPLD (CPLD), field programmable logic array (FPLA) (FPGA) or special IC (ASIC) to realize its function.Meanwhile, control module 22 can also together be designed to be fabricated to power switching module 23 the form use of special IC.
Fig. 3 is the structural representation that the interface of third embodiment of the invention connects off normal detecting and holding circuit.As shown in Figure 3, the present embodiment uses discrete device/integrated circuit to form interface connection off normal detecting and holding circuit 30.Interface connects off normal detecting and holding circuit 30 comprises the detecting indicating module 31 that utilizes light emitting diode in parallel 312 and shunt resistance 313 and detecting power end 311 to form; Utilize the power switching module 33 of integrate circuit relay OMRON G5V-1 formation, and comprise the control module 32 of two field effect transistors.
Wherein, the grid of P-channel field-effect transistor (PEFT) pipe 321 is connected with off normal detecting port, and source electrode and control module power supply (in the present embodiment, control module power supply uses identical power supply with detecting power supply) are connected, and drain electrode is connected with the grid of described N channel field-effect pipe 322.
The grid of N channel field-effect pipe 322 is by divider resistance 323 ground connection; Its source ground; The drain electrode of N channel field-effect pipe 322 is connected output control signal with power switching module 33.
Certainly, it will be appreciated by those skilled in the art that, the circuit form that control module can adopt is not limited to the illustrational circuit of the present embodiment, and it can adopt the circuit of any realization control signal that output control power module is cut off the electricity supply in the time off normal detecting port high voltage being detected.Simultaneously, control module both can adopt discrete component to connect and compose as described in this enforcement, also can use single-chip microcomputer (MCU), CPLD (CPLD), field programmable logic array (FPLA) (FPGA) or special IC (ASIC) to realize.Meanwhile, control module 22 can also together be designed to be fabricated to power switching module 23 the form use of special IC.
The present embodiment can, for the external interface of plurality of liquid crystals demonstration module or panel is protected, be connected detecting connection off normal phenomenon by the independent grounding port in interface and off normal detecting interface, obtains good result.Wherein, in the time the glass of display panels is walked to line interface protecting, glass cabling burns fraction defective and drops to 0% by original 1.94%.
The present embodiment is detected the voltage of the protected interface independent grounding of Port detecting end by off normal; detect at off normal detecting port electric voltage exception time; driving power switch module cuts off to the power supply of interface power supply; the connecting interface that can find in time liquid crystal display module or display panels connects the circuit that off normal phenomenon docking port two ends connect to be protected, greatly reduce liquid crystal display module or panel in application or test process because occurring that connecting off normal causes device or instrument damage probability.
Interface described in above-described embodiment connects off normal detecting and holding circuit can be for the protection of the interface between lcd drive chip and liquid crystal panel, also can be for the protection of liquid crystal display module and peripheral circuit, for example, the interface between display driver circuit.
Meanwhile, the power supply that in above-described embodiment, power switching module is controlled can be backlight electric power, mimic channel power supply, digital circuit power source thrin or its combination of liquid crystal display.
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 changes and variation.All any amendments of doing, be equal to replacement, improvement etc., within protection scope of the present invention all should be included within spirit of the present invention and principle.
Claims (10)
1. interface connects off normal detecting and a holding circuit, and described circuit comprises detecting indicating module, control module and power switching module;
Described detecting indicating module is connected with off normal detecting port, for there is connecting off normal according to the signal detection the instruction that connect off normal detecting interface;
Described control module is connected with off normal detecting port, keeps disconnecting with interface power supply for control power switching module in the time there is connection off normal;
Described power switching module is connected with described control module, is off-state under default condition, for keep the off-state of interface power supply according to the control of control module;
Wherein, described off normal detecting port is connected with the independent grounding end of protected interface.
2. interface according to claim 1 connects off normal detecting and holding circuit, it is characterized in that, described power switching module comprises input end, output terminal and control end;
Described input end is connected to interface power supply;
Described output terminal is connected to the power input of protected interface;
Described control end is connected with described control module.
3. interface according to claim 1 connects off normal detecting and holding circuit, it is characterized in that, described detecting indicating module comprises detecting power end, and, be connected in power end in parallel and connect light emitting diode and the shunt resistance between off normal detecting interface.
4. interface according to claim 1 connects off normal detecting and holding circuit, it is characterized in that, whether described control module is that high level judges whether to occur connecting off normal according to described off normal detecting port voltage.
5. interface according to claim 4 connects off normal detecting and holding circuit; it is characterized in that; described control module makes the control signal of power switching module conducting, the control signal that output remains open power switching module in the time that off normal detecting port is high level for output in the time that off normal detecting port is low level.
6. interface according to claim 5 connects off normal detecting and holding circuit, it is characterized in that, described control module comprises P-channel field-effect transistor (PEFT) pipe and N channel field-effect pipe;
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 pipe;
The grid of described N channel field-effect pipe is by divider resistance ground connection; The source ground of described N channel field-effect pipe; The drain electrode of described N channel field-effect pipe is connected output control signal with described power switching module.
7. interface according to claim 6 connects off normal detecting and holding circuit, it is characterized in that, described control module also comprises 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.
8. interface according to claim 1 connects off normal detecting and holding circuit, it is characterized in that, described protected interface is the interface between lcd drive chip and liquid crystal panel; Or
Described protected interface is the interface between liquid crystal display module and display driver circuit.
9. interface according to claim 1 connects off normal detecting and holding circuit, it is characterized in that, arbitrary or its combination in backlight electric power that described interface power supply is liquid crystal display module, mimic channel power supply, digital circuit power source.
10. interface according to claim 1 connects off normal detecting and holding circuit, it is characterized in that, arbitrary or its combination in backlight electric power that described interface power supply is liquid crystal panel, mimic channel 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 | Interface connection deviation detecting and protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210531874.0A CN103869201B (en) | 2012-12-11 | 2012-12-11 | Interface connection deviation detecting and protecting circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN103869201A true CN103869201A (en) | 2014-06-18 |
| CN103869201B CN103869201B (en) | 2016-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210531874.0A Expired - Fee Related CN103869201B (en) | 2012-12-11 | 2012-12-11 | Interface connection deviation detecting and protecting circuit |
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| Country | Link |
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| CN (1) | CN103869201B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN102789076A (en) * | 2012-08-01 | 2012-11-21 | 深圳市华星光电技术有限公司 | Detection circuit and manufacturing method for liquid crystal display panel |
| CN203191662U (en) * | 2013-02-01 | 2013-09-11 | 马丁青 | Liquid crystal display module test system |
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2012
- 2012-12-11 CN CN201210531874.0A patent/CN103869201B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07264519A (en) * | 1994-03-18 | 1995-10-13 | Casio Comput Co Ltd | Liquid crystal display |
| 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 |
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Cited By (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 | Publication date |
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| CN103869201B (en) | 2016-08-03 |
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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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