CN105548727A - CKV signal detection circuit and liquid crystal panel control panel with same - Google Patents
CKV signal detection circuit and liquid crystal panel control panel with same Download PDFInfo
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- CN105548727A CN105548727A CN201510896419.4A CN201510896419A CN105548727A CN 105548727 A CN105548727 A CN 105548727A CN 201510896419 A CN201510896419 A CN 201510896419A CN 105548727 A CN105548727 A CN 105548727A
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- led
- control panel
- ckv
- ckv signal
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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)
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- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a CKV signal detection circuit applied to a liquid crystal panel control panel. The CKV signal detection circuit comprises a first LED, a second LED, a first light sensor, a second light sensor and a judging module. The second LED and the first LED are connected in parallel and are opposite in phase. A node between the first LED and the second LED is used for receiving CKV signals output by the control panel. The first light sensor and the second light sensor are respectively arranged nearby the first LED and the second LED and are respectively used for sensing light emitting conditions of the first LED and the second LED. The judging module is used for judging whether the CKV signals are normal according to the sensing results of the first light sensor and the second light sensor and controlling the control panel to stop working when the CKV signals are abnormal. In this way, the damages of the abnormal CKV signals to a liquid crystal panel are effectively avoided. The invention further provides the liquid crystal panel control panel with the CKV signal detection circuit.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly relate to a kind of field displacement pulse (CKV) signal deteching circuit and there is this CKV signal deteching circuit liquid crystal panel control panel.
Background technology
In display field, in order to reduce costs and realize narrow frame design, usual employing array base palte raster data model (GateDriveronArray, GOA) technology replaces the fixed grid-driving integrated circuit chip of display panel foreign countries, the grid-driving integrated circuit of display panel is arranged on array base palte, forms the turntable driving to display panel.The glass substrate that signal wire for the CKV signal of control gate driver (GateDriver) sweep frequency is routed in liquid crystal panel is usually outside, by array connect up outward (WireOnArray, WOA) design.When short circuit or other abnormal conditions appear in CKV cabling, easily cause electric current excessive and damage liquid crystal panel.
Summary of the invention
The object of the present invention is to provide a kind of CKV signal deteching circuit, to solve the technical matters damaging liquid crystal panel in prior art because CKV signal occurs extremely.
The invention provides a kind of CKV signal deteching circuit, be applied to a liquid crystal panel control panel, this CKV signal deteching circuit comprises:
One LED;
2nd LED, and anti-phase setting in parallel with a described LED, the CKV signal that the node between a described LED and the 2nd LED exports for receiving described control panel;
First optical sensor, closes on a described LED and arranges, for sensing the luminous situation of a LED;
Second optical sensor, closes on described 2nd LED and arranges, for sensing the luminous situation of the 2nd LED; And
Judge module, is electrically connected to described first optical sensor and the second optical sensor, for the induction result according to the first optical inductor and the second optical inductor, judges that this CKV signal is whether abnormal, and controls this control panel when this CKV abnormal signal and quit work.
Wherein, described judge module comprises the first comparing unit, the second comparing unit or door and electronic switch; Described first comparing unit and the second comparing unit are electrically connected to described first optical inductor and the second optical inductor respectively, and are electrically connected to two input ends that are described or door respectively; Output terminal that is described or door is electrically connected to described control panel by described electronic switch.
Wherein, described first comparing unit is used for exporting corresponding judged result according to the brightness value of described first photosensor senses and brightness duration, when the brightness value of described first photosensor senses is at one first predetermined luminance range, and this brightness value continues one first preset time range within this CKV signal one-period time, then described first comparing unit exports a logical zero; When the brightness value of described first photosensor senses is not at this first predetermined luminance range, or then described first comparing unit exports a logical one not in this first preset time range this brightness value duration within this CKV signal one-period time.
Wherein, described second comparing unit is used for exporting corresponding judged result according to the brightness value of described second photosensor senses and brightness duration, when the brightness value of described second photosensor senses is at one second predetermined luminance range, and this brightness value continues one second preset time range within this CKV signal one-period time, then described second comparing unit exports a logical zero; When the brightness value of described second photosensor senses is not at this second predetermined luminance range, or then described second comparing unit exports a logical one not in this second preset time range this brightness value duration within this CKV signal one-period time.
Wherein, described electronic switch is a metal oxide semiconductor field effect tube (metal-oxidesemiconductorFET, MOSFET), and its grid is electrically connected to output terminal that is described or door, source ground process, drain electrode is electrically connected to described control panel.
Wherein, described electronic switch is a triode, and its base stage is electrically connected to output terminal that is described or door, and grounded emitter process, collector is electrically connected to described control panel.
Wherein, described CKV signal deteching circuit also comprises the first resistance and the second resistance; Described first resistance one end is electrically connected to described control panel to receive described CKV signal, and the other end is electrically connected to the anode of a described LED, the plus earth process of a described LED; Described second resistance one end is electrically connected to described control panel to receive described CKV signal, and the other end is electrically connected to the negative electrode of described 2nd LED, the plus earth process of described 2nd LED.
The present invention also provides a kind of liquid crystal panel control panel, and described control panel also comprises described CKV signal deteching circuit.
Wherein, described control panel also comprises timing controller and power management chip, described timing controller is for exporting described CKV signal, described timing controller for providing voltage for each circuit component on described control panel, and stops as each circuit component on described control panel provides voltage under the control of described control module.
CKV signal deteching circuit of the present invention is by arranging a LED and the 2nd LED is controlled by CKV signal, reflect that whether CKV signal is normal by the luminous situation of a LED and the 2nd LED, and the control panel controlling liquid crystal panel when CKV abnormal signal being detected quits work, and can effectively avoid due to CKV abnormal signal and cause damage to liquid crystal panel.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying 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 oscillogram of CKV signal.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, the invention provides a kind of CKV signal deteching circuit 10, be applied to a liquid crystal panel control panel (controlboard) 100, whether the CKV signal exported for the sequential control circuit TCON (not shown) of detection control plate 100 is abnormal, and controls this control panel 100 when CKV abnormal signal being detected and quit work.Particularly, control panel 100 also comprises timing controller (Timingcontroller, T-CON) 20 and power management chip 30.Timing controller 10 is for outputting data signals respectively and the source electrode driver and the gate drivers that control signal to a liquid crystal panel.Timing controller 10 comprises a CKV signal output part CKV.Power management chip 30, for a DC input voitage is converted to multiple different VD, is thought each circuit component on control panel 100 and provides voltage to liquid crystal display.Power management chip 30 comprises a power enable end PWRON, and when this power enable end PWRON is invalid, power management chip 30 stops output voltage, thus whole control panel 100 and liquid crystal display are quit work.
The CKV signal deteching circuit 10 of better embodiment of the present invention comprises a LEDD1, the 2nd LEDD2, the first optical sensor 11, second optical sensor 12 and judge module 13.
One LEDD1 and the 2nd LEDD2 is arranged in parallel and mutually anti-phase, and the node between a LEDD1 and the 2nd LEDD2 is electrically connected to the CKV signal output part of control panel 100, to receive the CKV signal exported from control panel 100.Particularly, in order to match with the voltage swing of CKV signal, CKV signal deteching circuit 10 also comprises the first resistance R1 and the second resistance R2.First resistance R1 one end is electrically connected to the CKV signal output part of control panel 200, and the other end is electrically connected to the anode of a LEDD1, the plus earth process of a LEDD1.Second resistance R2 one end is electrically connected to the CKV signal output part of control panel 100, and the other end is electrically connected to the negative electrode of the 2nd LEDD2, the plus earth process of the 2nd LEDD2.
First optical sensor 11 and the second optical sensor 12 close on a LEDD1 and the 2nd LEDD2 respectively and arrange, and are respectively used to the luminous situation of sensing the one LEDD1 and the 2nd LEDD2.Judge module 13 is electrically connected to the first optical sensor 11 and the second optical sensor 12, for the induction result according to the first optical inductor 11 and the second optical inductor 12, judge that this CKV signal is whether abnormal, and control this control panel 100 when CKV abnormal signal being detected and quit work.
Particularly, judge module 13 comprises the first comparing unit 131, second comparing unit 132 or door 133 and electronic switch 134.First comparing unit 131 and the second comparing unit 132 are electrically connected to the first optical inductor 11 and the second optical inductor 12 respectively, and are electrically connected to respectively or the input end A of door 133 and input end B.First comparing unit 131 for according to first optical sensor 11 sense brightness value and the brightness duration export corresponding judged result, when the brightness value of the first optical sensor 11 sensing is at one first predetermined luminance range, and within the CKV signal one-period time, this brightness value continues one first preset time range, then export a logical zero; When first optical sensor 11 sense brightness value not at the first predetermined luminance range, or within the CKV signal one-period time this brightness value duration not in the first preset time range, then export a logical one.Second comparing unit 132 for according to second optical sensor 12 sense brightness value and the brightness duration export corresponding judged result, when the brightness value of the second optical sensor 12 sensing is at one second predetermined luminance range, and within the CKV signal one-period time, this brightness value continues one second preset time range, then export a logical zero; When second optical sensor 12 sense brightness value not at the second predetermined luminance range, or within the CKV signal one-period time this brightness value duration not in the second preset time range, then export a logical one.
Be appreciated that the first comparing unit 131 and the second comparing unit 132 can be integrated in timing controller 20.
Or the output terminal Y of door 133 is electrically connected to electronic switch 134.The power enable end PWRON of power management chip 30 is by electronic switch 134 ground connection.When or door 133 output logic 1 to electronic switch 134 time, electronic switch 134 conducting makes the power enable end PWRON ground connection of power management chip 30 thus controls this control panel 100 to quit work.
In the present embodiment, electronic switch 134 is a metal oxide semiconductor field effect tube (metal-oxidesemiconductorFET, MOSFET), its grid G is electrically connected to or the output terminal Y of door 133, source S grounding, drain D is electrically connected to the power enable end PWRON of power management chip 30.Be appreciated that in the embodiment that other are alternative, electronic switch 134 can be a triode, and its base stage, emitter and collector be the grid G of corresponding described MOSFET, source S and drain D respectively.
The principle of work of CKV signal deteching circuit 10 of the present invention is described in detail below in conjunction with Fig. 2.
Refer to Fig. 2, normal CKV signal is the square-wave signal in a cycle, and its high level is the cut-in voltage VGH controlling liquid crystal panel TFT unlatching, is a positive voltage value; The low level of CKV signal is the closedown voltage VGL controlling liquid crystal panel TFT closedown, is a negative value.When CKV signal is normal, CKV signal, when high level VGH, only drives a LEDD1 conducting, and maintains conducting to described first preset time range, and brightness maintains one first brightness range.When CKV signal is at low level VGL, only drive the 2nd LEDD2 conducting, and maintain conducting to described second preset time range, brightness maintains one second brightness range.
But, when CKV signal occurs abnormal, such as shown in Fig. 2, high level VGH amplitude reduces, the brightness of a LEDD1 now can be caused to diminish, and now the brightness value of the first optical sensor 11 sensing is not in the first preset range, now the first comparing unit 131 output logic 1, or door 133 output logic 1 controls electronic switch 134 conducting, then the power enable end PWRON of power management chip 30 is dragged down thus is controlled this control panel 100 and quit work.
And for example, as shown in Figure 2, when the low level VGL of level is anti-phase become positive voltage value time, then cannot drive the 2nd LEDD2 conducting, the brightness value that now the second optical sensor 11 senses in the one-period of CKV signal is 0, second comparing unit 132 output logic 1, or door 133 output logic 1 controls electronic switch 134 conducting, then and the power enable end PWRON of power management chip 30 is dragged down thus is controlled this control panel 100 and quit work.
And for example, when high level VGH duration extension or when shortening, the brightness duration that first optical sensor 11 senses is not then within the very first time, now the first comparing unit 131 output logic 1, or door 133 output logic 1 controls electronic switch 134 conducting, then the power enable end PWRON of control panel 100 is dragged down thus is controlled this control panel 100 and quit work.Similarly, when low level VGL duration extension or when shortening, the brightness duration that second optical sensor 12 senses is not then in the second time range, now the second comparing unit 132 output logic 1, or door 133 output logic 1 controls electronic switch 134 conducting, then the power enable end PWRON of power management chip 30 is dragged down thus is controlled this control panel 100 and quit work.
As can be seen here, CKV signal deteching circuit 10 of the present invention is by arranging a LEDD1 and the 2nd LEDD2 is controlled by CKV signal, reflect that whether CKV signal is normal by the luminous situation of a LEDD1 and the 2nd LEDD2, and the control panel 100 controlling liquid crystal panel when CKV abnormal signal being detected quits work, and can effectively avoid due to CKV abnormal signal and cause damage to liquid crystal panel.
Above disclosedly be only present pre-ferred embodiments, certainly the interest field of the present invention can not be limited with this, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and according to the equivalent variations that the claims in the present invention are done, still belong to the scope that invention is contained.
Claims (9)
1. a CKV signal deteching circuit, is applied to a liquid crystal panel control panel, it is characterized in that, this CKV signal deteching circuit comprises:
One LED;
2nd LED, and anti-phase setting in parallel with a described LED, the CKV signal that the node between a described LED and the 2nd LED exports for receiving described control panel;
First optical sensor, closes on a described LED and arranges, for sensing the luminous situation of a LED;
Second optical sensor, closes on described 2nd LED and arranges, for sensing the luminous situation of the 2nd LED; And
Judge module, is electrically connected to described first optical sensor and the second optical sensor, for the induction result according to the first optical inductor and the second optical inductor, judges that this CKV signal is whether abnormal, and controls this control panel when this CKV abnormal signal and quit work.
2. CKV signal deteching circuit as claimed in claim 1, is characterized in that: described judge module comprises the first comparing unit, the second comparing unit or door and electronic switch; Described first comparing unit and the second comparing unit are electrically connected to described first optical inductor and the second optical inductor respectively, and are electrically connected to two input ends that are described or door respectively; Output terminal that is described or door is electrically connected to described control panel by described electronic switch.
3. CKV signal deteching circuit as claimed in claim 2, it is characterized in that: described first comparing unit is used for exporting corresponding judged result according to the brightness value of described first photosensor senses and brightness duration, when the brightness value of described first photosensor senses is at one first predetermined luminance range, and this brightness value continues one first preset time range within this CKV signal one-period time, then described first comparing unit exports a logical zero; When the brightness value of described first photosensor senses is not at this first predetermined luminance range, or then described first comparing unit exports a logical one not in this first preset time range this brightness value duration within this CKV signal one-period time.
4. CKV signal deteching circuit as claimed in claim 2, it is characterized in that: described second comparing unit is used for exporting corresponding judged result according to the brightness value of described second photosensor senses and brightness duration, when the brightness value of described second photosensor senses is at one second predetermined luminance range, and this brightness value continues one second preset time range within this CKV signal one-period time, then described second comparing unit exports a logical zero; When the brightness value of described second photosensor senses is not at this second predetermined luminance range, or then described second comparing unit exports a logical one not in this second preset time range this brightness value duration within this CKV signal one-period time.
5. CKV signal deteching circuit as claimed in claim 2, it is characterized in that: described electronic switch is a metal oxide semiconductor field effect tube (metal-oxidesemiconductorFET, MOSFET), its grid is electrically connected to output terminal that is described or door, source ground process, drain electrode is electrically connected to described control panel.
6. CKV signal deteching circuit as claimed in claim 2, it is characterized in that: described electronic switch is a triode, its base stage is electrically connected to output terminal that is described or door, and grounded emitter process, collector is electrically connected to described control panel.
7. CKV signal deteching circuit as claimed in claim 1, is characterized in that: described CKV signal deteching circuit also comprises the first resistance and the second resistance; Described first resistance one end is electrically connected to described control panel to receive described CKV signal, and the other end is electrically connected to the anode of a described LED, the plus earth process of a described LED; Described second resistance one end is electrically connected to described control panel to receive described CKV signal, and the other end is electrically connected to the negative electrode of described 2nd LED, the plus earth process of described 2nd LED.
8. a liquid crystal panel control panel, is characterized in that: described control panel also comprises the CKV signal deteching circuit as described in any one of claim 1-7.
9. liquid crystal panel control panel as claimed in claim 8, it is characterized in that: described control panel also comprises timing controller and power management chip, described timing controller is for exporting described CKV signal, described timing controller for providing voltage for each circuit component on described control panel, and stops as each circuit component on described control panel provides voltage under the control of described control module.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN105548727B CN105548727B (en) | 2018-12-07 |
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| 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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| CN105548727B (en) | 2018-12-07 |
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