CN105548727B - CKV signal deteching circuit and liquid crystal display panel control panel with it - Google Patents
CKV signal deteching circuit and liquid crystal display panel control panel with it Download PDFInfo
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- CN105548727B CN105548727B CN201510896419.4A CN201510896419A CN105548727B CN 105548727 B CN105548727 B CN 105548727B CN 201510896419 A CN201510896419 A CN 201510896419A CN 105548727 B CN105548727 B CN 105548727B
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- led
- liquid crystal
- ckv
- crystal display
- optical sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
- G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
- G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
- G01R29/0273—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being duration, i.e. width (indicating that frequency of pulses is above or below a certain limit)
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
Abstract
The present invention provides a kind of CKV signal deteching circuit, is applied to a liquid crystal display panel control panel, which includes the first LED, the 2nd LED, the first optical sensor, the second optical sensor and judgment module.2nd LED is in parallel with the first LED and reverse phase is arranged, and the node between the first LED and the 2nd LED is used to receive the CKV signal of the control panel output.First optical sensor and the second optical sensor close on the first LED setting and the 2nd LED setting respectively, are respectively used to the luminous situation of sensing the first LED and the 2nd LED.The judgment module is used for the induction according to the first optical sensor and the second optical sensor as a result, whether extremely to judge the CKV signal, and control the control panel in the CKV abnormal signal and stop working.It is described effectively to avoid damaging liquid crystal display panel due to CKV abnormal signal.The present invention also provides a kind of liquid crystal display panel control panels with the CKV signal deteching circuit.
Description
Technical field
The present invention relates to technical field of liquid crystal display more particularly to a kind of dfisplacement pulse (CKV) signal deteching circuit and
With the CKV signal deteching circuit liquid crystal display panel control panel.
Background technique
Array substrate gate driving is generallyd use in display field in order to reduce cost and realize narrow frame design
(Gate Driver on Array, GOA) technology replaces the grid-driving integrated circuit chip of the outer bonding of display panel, will show
Show that the grid-driving integrated circuit of panel is arranged in array substrate, forms the turntable driving to display panel.For control gate
The signal wire of the CKV signal of driver (Gate Driver) scan frequency is usually routed in outside the glass substrate of liquid crystal display panel
Portion is designed by being routed (Wire On Array, WOA) outside array.When short circuit or other abnormal feelings occurs in CKV cabling
When condition, it is easy to cause electric current excessive and damages liquid crystal display panel.
Summary of the invention
The purpose of the present invention is to provide a kind of CKV signal deteching circuits, to solve in the prior art since CKV signal goes out
It is now abnormal and the technical issues of damage liquid crystal display panel.
The present invention provides a kind of CKV signal deteching circuit, is applied to a liquid crystal display panel control panel, the CKV signal detection electricity
Road includes:
First LED；
2nd LED, and reverse phase in parallel with the first LED are arranged, and the node between the first LED and the 2nd LED is used
In the CKV signal for receiving the liquid crystal display panel control panel output；
First optical sensor closes on the first LED setting, for sensing the luminous situation of the first LED；
Second optical sensor closes on the 2nd LED setting, for sensing the luminous situation of the 2nd LED；And
Judgment module is electrically connected to first optical sensor and the second optical sensor, for according to the first light sensing
Whether extremely the induction of device and the second optical sensor is as a result, judge the CKV signal, and control the liquid in the CKV abnormal signal
Crystal panel control panel stops working.
Wherein, the judgment module includes the first comparing unit, the second comparing unit or door and electronic switch；It is described
First comparing unit and the second comparing unit are respectively and electrically connected to first optical sensor and the second optical sensor, and respectively
It is electrically connected to described or door two input terminals；Described or door output end is electrically connected to described by the electronic switch
The power management chip of liquid crystal display panel control panel.
Wherein, when the brightness value and brightness that first comparing unit is used to be sensed according to first optical sensor continue
Between export corresponding judging result, when first optical sensor sensing brightness value in one first predetermined luminance range, and
The brightness value continues one first preset time range in the CKV signal a cycle time, then the first comparing unit output
One logical zero；When the brightness value of first optical sensor sensing is not in first predetermined luminance range, or in the CKV signal
The brightness value duration, then first comparing unit exported not in first preset time range in a cycle time
One logic 1.
Wherein, when the brightness value and brightness that second comparing unit is used to be sensed according to second optical sensor continue
Between export corresponding judging result, when second optical sensor sensing brightness value in one second predetermined luminance range, and
The brightness value continues one second preset time range in the CKV signal a cycle time, then the second comparing unit output
One logical zero；When the brightness value of second optical sensor sensing is not in second predetermined luminance range, or in the CKV signal
The brightness value duration, then second comparing unit exported not in second preset time range in a cycle time
One logic 1.
Wherein, the electronic switch is a metal oxide semiconductor field effect tube (metal-oxide
Semiconductor FET, MOSFET), grid is electrically connected to described or door output end, source electrode grounding, drain electrode
It is electrically connected to the power management chip of the liquid crystal display panel control panel.
Wherein, the electronic switch is a triode, and base stage is electrically connected to described or door output end, and emitter connects
Ground processing, collector are electrically connected to the power management chip of the liquid crystal display panel control panel.
Wherein, the CKV signal deteching circuit further includes first resistor and second resistance；Described first resistor one end is electrical
The CKV signal output end of the liquid crystal display panel control panel is connected to receive the CKV signal, the other end is electrically connected to described
The anode of first LED, the minus earth processing of the first LED；Described second resistance one end is electrically connected to the liquid crystal surface
For the CKV signal output end of plate control panel to receive the CKV signal, the other end is electrically connected to the cathode of the 2nd LED, institute
State the plus earth processing of the 2nd LED.
The present invention also provides a kind of liquid crystal display panel control panel, the liquid crystal display panel control panel includes the CKV signal inspection
Slowdown monitoring circuit.
Wherein, the liquid crystal display panel control panel further includes timing controller and power management chip, the timing control
Chip is used for for exporting the CKV signal, the power management chip as each circuit on the liquid crystal display panel control panel
Element provides voltage, and stops mentioning for each circuit element on the liquid crystal display panel control panel in the CKV abnormal signal
Voltage supplied.
CKV signal deteching circuit of the present invention is controlled by CKV signal by the way that the first LED and the 2nd LED is arranged, and passes through
The luminous situation of first LED and the 2nd LED controls liquid when detecting CKV abnormal signal to reflect whether CKV signal is normal
The control panel of crystal panel stops working, and can effectively avoid damaging liquid crystal display panel due to CKV abnormal signal.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the circuit diagram of the control panel with better embodiment CKV signal deteching circuit of the present invention.
Fig. 2 is the waveform diagram of CKV signal.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the present invention provides a kind of CKV signal deteching circuit 10, it is applied to a liquid crystal display panel control panel
(control board) 100, what the sequential control circuit TCON (not shown) for detecting liquid crystal display panel control panel 100 exported
Whether CKV signal is abnormal, and controls the liquid crystal display panel control panel 100 when detecting CKV abnormal signal and stop working.Specifically
Ground, liquid crystal display panel control panel 100 further include timing controller (Timing controller, T-CON) 20 and power management
Chip 30.Timing controller 10 be used for distinguish outputting data signals and control signal to a liquid crystal display panel source electrode driver and
Gate drivers.Timing controller 10 includes a CKV signal output end CKV.Power management chip 30 is used for a direct current is defeated
Enter voltage and be converted to multiple and different DC output voltage, on liquid crystal display panel control panel 100 each circuit element and
Voltage is provided to liquid crystal display.Power management chip 30 includes a power supply enable end PWRON, and when the power supply enable end, PWRON is invalid
When, power management chip 30 stops output voltage, so that entire liquid crystal display panel control panel 100 and liquid crystal display stop working.
The CKV signal deteching circuit 10 of better embodiment of the present invention includes the first LED D1, the 2nd LED D2, the first light
Sensor 11, the second optical sensor 12 and judgment module 13.
First LED D1 and the 2nd LED D2 is arranged in parallel and mutual reverse phase, between the first LED D1 and the 2nd LED D2
Node is electrically connected to the CKV signal output end of liquid crystal display panel control panel 100, is exported with receiving from liquid crystal display panel control panel 100
CKV signal.Specifically, in order to match with the voltage swing of CKV signal, CKV signal deteching circuit 10 further includes the first electricity
Hinder R1 and second resistance R2.The one end first resistor R1 is electrically connected to the CKV signal output end of liquid crystal display panel control panel 100, separately
One end is electrically connected to the anode of the first LED D1, the minus earth processing of the first LED D1.The one end second resistance R2 electrically connects
It is connected to the CKV signal output end of liquid crystal display panel control panel 100, the other end is electrically connected to the cathode of the 2nd LED D2, the 2nd LED
The plus earth of D2 is handled.
First optical sensor 11 and the second optical sensor 12 close on the first LED D1 and the 2nd LED D2 setting respectively, respectively
For sensing the luminous situation of the first LED D1 and the 2nd LED D2.Judgment module 13 be electrically connected to the first optical sensor 11 and
Second optical sensor 12, for the induction according to the first optical sensor 11 and the second optical sensor 12 as a result, judging the CKV signal
It is whether abnormal, and control the liquid crystal display panel control panel 100 when detecting CKV abnormal signal and stop working.
Specifically, judgment module 13 includes the first comparing unit 131, the second comparing unit 132 or door 133 and electronics
Switch 134.First comparing unit 131 and the second comparing unit 132 are respectively and electrically connected to the first optical sensor 11 and the second light
Sensor 12, and be respectively and electrically connected to or the input terminal A and input terminal B of door 133.First comparing unit 131 is used for according to the
The brightness value of one optical sensor 11 sensing and brightness duration export corresponding judging result, when the first optical sensor 11 senses
Brightness value in one first predetermined luminance range, and within the CKV signal a cycle time, to continue one first default for the brightness value
Time range then exports a logical zero；When the first optical sensor 11 sensing brightness value not in the first predetermined luminance range, or
The brightness value duration not in the first preset time range, then exports a logic 1 within the CKV signal a cycle time.
The brightness value and the corresponding judgement of brightness duration output that second comparing unit 132 is used to be sensed according to the second optical sensor 12
As a result, when the brightness value of the second optical sensor 12 sensing is in one second predetermined luminance range, and in the CKV signal a cycle time
The interior brightness value continues one second preset time range, then exports a logical zero；When the second optical sensor 12 sensing brightness value not
In the second predetermined luminance range, or within the CKV signal a cycle time brightness value duration not when second is default
Between in range, then export a logic 1.
It is appreciated that the first comparing unit 131 and the second comparing unit 132 can integrate in timing controller 20.
Or the output end Y of door 133 is electrically connected to electronic switch 134.The power supply enable end PWRON of power management chip 30
It is grounded by electronic switch 134.When or door 133 export logic 1 to electronic switch 134 when, electronic switch 134 conducting make power supply pipe
The power supply enable end PWRON ground connection of reason chip 30 stops working to control the liquid crystal display panel control panel 100.
In the present embodiment, electronic switch 134 is a metal oxide semiconductor field effect tube (metal-oxide
Semiconductor FET, MOSFET), grid G is electrically connected to or the output end Y of door 133, source S grounding, leakage
Pole D is electrically connected to the power supply enable end PWRON of power management chip 30.It is appreciated that in other alternative embodiments
In, electronic switch 134 can be a triode, base stage, emitter and collector respectively correspond the MOSFET grid G,
Source S and drain D.
Below in conjunction with the working principle of Fig. 2 the present invention will be described in detail CKV signal deteching circuit 10.
Referring to Fig. 2, normal CKV signal is the square-wave signal in a period, high level is that control liquid crystal display panel TFT is opened
Cut-in voltage VGH, be a positive voltage value；The low level of CKV signal is the closing voltage VGL for controlling liquid crystal display panel TFT and closing,
For a negative value.When CKV signal is normal, CKV signal only drives the first LED D1 conducting in high level VGH, and maintains
It is conducted to first preset time range, brightness maintains one first brightness range.When CKV signal is in low level VGL, only
It drives the 2nd LED D2 to be connected, and maintains to be conducted to second preset time range, brightness maintains one second brightness range.
However, when CKV signal occurs abnormal, such as shown in Fig. 2, high level VGH amplitude reduces, and will lead to first at this time
The brightness of LED D1 becomes smaller, and the brightness value of the first optical sensor 11 sensing is not in the first preset range at this time, and first compares at this time
Logic 1 is exported compared with unit 131 or door 133 exports logic 1 and controls the conducting of electronic switch 134, then the power supply of power management chip 30
Enable end PWRON is pulled low to stop working to control the liquid crystal display panel control panel 100.
For another example, as shown in Fig. 2, then the 2nd LED D2 can not be driven to lead when low level VGL umklapp transformation is positive voltage value
Logical, the brightness value that the second optical sensor 11 senses in a cycle of CKV signal at this time is 0, the output of the second comparing unit 132
Logic 1 or door 133 export logic 1 and control the conducting of electronic switch 134, then the power supply enable end PWRON quilt of power management chip 30
It drags down to stop working to control the liquid crystal display panel control panel 100.
For another example, when high level VGH duration extension or shortening, the brightness duration of the first optical sensor 11 sensing
Then not within first time, the first comparing unit 131 output logic 1 or door 133 export logic 1 and control electronic cutting at this time
134 conductings are closed, then the power supply enable end PWRON of liquid crystal display panel control panel 100 is pulled low to control the liquid crystal display panel control panel
100 stop working.Similarly, when low level VGL duration extension or shortening, the brightness of the second optical sensor 12 sensing is held
The second comparing unit 132 output logic 1 or door 133 exported logic 1 and controlled at this time then not in the second time range the continuous time
Electronic switch 134 is connected, then the power supply enable end PWRON of power management chip 30 is pulled low to control liquid crystal display panel control
Plate 100 stops working.
It can be seen that CKV signal deteching circuit 10 of the present invention passes through setting the first LED D1 and the 2nd LED D2
It is controlled by CKV signal, reflects whether CKV signal is normal by the luminous situation of the first LED D1 and the 2nd LED D2, and
It detects that the liquid crystal display panel control panel 100 for controlling liquid crystal display panel when CKV abnormal signal stops working, can effectively avoid due to CKV
Abnormal signal and liquid crystal display panel is damaged.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and wants according to right of the present invention
Made equivalent variations is sought, is still belonged to the scope covered by the invention.
Claims (9)
1. a kind of CKV signal deteching circuit is applied to a liquid crystal display panel control panel, which is characterized in that the CKV signal deteching circuit
Include:
First LED；
2nd LED, and reverse phase in parallel with the first LED are arranged, and the node between the first LED and the 2nd LED is for connecing
Receive the CKV signal of the liquid crystal display panel control panel output；
First optical sensor closes on the first LED setting, for sensing the luminous situation of the first LED；
Second optical sensor closes on the 2nd LED setting, for sensing the luminous situation of the 2nd LED；And
Judgment module is electrically connected to first optical sensor and the second optical sensor, for according to the first optical sensor and
Whether extremely the induction of second optical sensor is as a result, judge the CKV signal, and control the liquid crystal surface in the CKV abnormal signal
Plate control panel stops working.
2. CKV signal deteching circuit as described in claim 1, it is characterised in that: the judgment module includes first relatively more single
Member, the second comparing unit or door and electronic switch；First comparing unit and the second comparing unit are respectively and electrically connected to
First optical sensor and the second optical sensor, and it is respectively and electrically connected to described or door two input terminals；Described or door
Output end the power management chip of the liquid crystal display panel control panel is electrically connected to by the electronic switch.
3. CKV signal deteching circuit as claimed in claim 2, it is characterised in that: first comparing unit is used for according to institute
The brightness value and brightness duration for stating the first optical sensor sensing export corresponding judging result, when first optical sensor
In one first predetermined luminance range, and within the CKV signal a cycle time, the brightness value continues one to the brightness value of sensing
One preset time range, then first comparing unit exports a logical zero；When first optical sensor sensing brightness value not
In first predetermined luminance range, or within the CKV signal a cycle time brightness value duration not this first
In preset time range, then first comparing unit exports a logic 1.
4. CKV signal deteching circuit as claimed in claim 2, it is characterised in that: second comparing unit is used for according to institute
The brightness value and brightness duration for stating the second optical sensor sensing export corresponding judging result, when second optical sensor
In one second predetermined luminance range, and within the CKV signal a cycle time, the brightness value continues one to the brightness value of sensing
Two preset time ranges, then second comparing unit exports a logical zero；When second optical sensor sensing brightness value not
In second predetermined luminance range, or within the CKV signal a cycle time brightness value duration not this second
In preset time range, then second comparing unit exports a logic 1.
5. CKV signal deteching circuit as claimed in claim 2, it is characterised in that: the electronic switch is a metal oxide
Semiconductor field (metal-oxide semiconductor FET, MOSFET), grid are electrically connected to described or door
Output end, source electrode grounding, drain electrode is electrically connected to the power management chip of the liquid crystal display panel control panel.
6. CKV signal deteching circuit as claimed in claim 2, it is characterised in that: the electronic switch is a triode, base
Pole is electrically connected to described or door output end, emitter grounding, and collector is electrically connected to the liquid crystal display panel control
The power management chip of plate.
7. CKV signal deteching circuit as described in claim 1, it is characterised in that: the CKV signal deteching circuit further includes
One resistance and second resistance；Described first resistor one end is electrically connected to the CKV signal output end of the liquid crystal display panel control panel
To receive the CKV signal, the other end is electrically connected to the anode of the first LED, at the minus earth of the first LED
Reason；Described second resistance one end is electrically connected to the CKV signal output end of the liquid crystal display panel control panel to receive the CKV letter
Number, the other end is electrically connected to the cathode of the 2nd LED, the plus earth processing of the 2nd LED.
8. a kind of liquid crystal display panel control panel, it is characterised in that: the liquid crystal display panel control panel includes such as any one of claim 1-7
The CKV signal deteching circuit.
9. liquid crystal display panel control panel as claimed in claim 8, it is characterised in that: the liquid crystal display panel control panel further includes timing
Chip and power management chip are controlled, the timing controller is used for exporting the CKV signal, the power management chip
In providing voltage for each circuit element on the liquid crystal display panel control panel, and stop being institute in the CKV abnormal signal
The each circuit element stated on liquid crystal display panel control panel provides voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510896419.4A CN105548727B (en) | 2015-12-08 | 2015-12-08 | CKV signal deteching circuit and liquid crystal display panel control panel with it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510896419.4A CN105548727B (en) | 2015-12-08 | 2015-12-08 | CKV signal deteching circuit and liquid crystal display panel control panel with it |
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| Publication Number | Publication Date |
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| CN105548727A CN105548727A (en) | 2016-05-04 |
| CN105548727B true CN105548727B (en) | 2018-12-07 |
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| CN201510896419.4A Active CN105548727B (en) | 2015-12-08 | 2015-12-08 | CKV signal deteching circuit and liquid crystal display panel control panel with it |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105913788A (en) | 2016-06-06 | 2016-08-31 | 深圳市华星光电技术有限公司 | Detection circuit of liquid crystal display panel and detection method thereof |
| CN106875877A (en) * | 2017-02-24 | 2017-06-20 | 京东方科技集团股份有限公司 | The detection means and method of gate driving circuit |
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| US4088992A (en) * | 1975-06-27 | 1978-05-09 | Bbc Brown, Boveri & Company, Limited | Electro-optical display device using a liquid crystal cell |
| CN201262819Y (en) * | 2008-09-28 | 2009-06-24 | 深圳创维－Rgb电子有限公司 | Liquid crystal television and sequence control circuit |
| CN101958091A (en) * | 2009-07-15 | 2011-01-26 | 北京京东方光电科技有限公司 | Post-casing detection device and method for liquid crystal display panel |
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| CN105548727A (en) | 2016-05-04 |
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