CN109682856A - Crack detection mould group, crack detecting method and display device - Google Patents
Crack detection mould group, crack detecting method and display device Download PDFInfo
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- CN109682856A CN109682856A CN201910079826.4A CN201910079826A CN109682856A CN 109682856 A CN109682856 A CN 109682856A CN 201910079826 A CN201910079826 A CN 201910079826A CN 109682856 A CN109682856 A CN 109682856A
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- 238000001514 detection method Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 20
- 208000037656 Respiratory Sounds Diseases 0.000 claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims description 15
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- 229920001621 AMOLED Polymers 0.000 description 2
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- 239000010409 thin film Substances 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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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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Abstract
The present invention provides a kind of crack detection mould group, crack detecting method and display device.Crack detection mould group, including detection conducting wire, filter circuit, resistance circuit and comparison circuit；Detection conducting wire extends in the presumptive area of display panel；The detection conducting wire includes first terminal and Second terminal；It states Second terminal to connect by resistance circuit with Input voltage terminal, Second terminal also passes through filter circuit and the first input end of comparison circuit connects；Filter circuit is used to filter out the noise voltage signal for the predetermined band being input in the voltage signal of first input end；Comparison circuit is used to compare the voltage and predetermined voltage of first input end, obtains comparison result；It can determine cracks according to the comparison result.The present invention can be determined accurately on display panel with the presence or absence of crackle.
Description
Technical field
The present invention relates to crack detection technical field more particularly to a kind of crack detection mould group, crack detecting method and show
Showing device.
Background technique
AMOLED (Active-matrix organic light-emitting diode, the organic hair of active matrix at present
Optical diode) display screen in order to detect whether display panel edge ruptures, lead in the fringe region setting detection of display panel by meeting
Electric line；When crackle is not present in the fringe region of display panel, the first terminal of the detection conducting wire and the detection are conductive
It is conducting between the Second terminal of route.If display panel ruptures, the detection conducting wire can be broken, then may be used
To judge whether rupture.However, GOA (Gate On Array, gate driving circuit) circuit is all in display surface at present
The fringe region cabling of plate, PCD (Panel Crack Detection, panel crack detection) cabling is also in display surface edges of boards
Edge can generate parasitic capacitance between GOA cabling and PCD cabling, will lead to the generation of noise, to can make when PCD is detected
It is now abnormal, lead to test inaccuracy.
Summary of the invention
The main purpose of the present invention is to provide a kind of crack detection mould group, crack detecting method and display devices, solve
In the prior art due to detecting conducting wire and being set to the parasitic capacitance generated between the GOA cabling on both sides of the display panel side,
So as to cause the problem of PCD (Panel Crack Detection, panel crack detection) detection inaccuracy.
In order to achieve the above object, the present invention provides a kind of crack detection mould groups, are applied to display panel, the crackle
Detecting mould group includes detection conducting wire, filter circuit, resistance circuit and comparison circuit；
The detection conducting wire extends in the presumptive area of the display panel；The detection conducting wire includes the
One terminal and Second terminal；The first terminal is connect with first voltage end；The first voltage end is for inputting first voltage；
The Second terminal is connect by the resistance circuit with Input voltage terminal, and the Second terminal also passes through the filter
Wave circuit is connect with the first input end of the comparison circuit；The filter circuit is input to the first input end for filtering out
Voltage signal in predetermined band noise voltage signal；The Input voltage terminal is for providing input voltage；
The comparison circuit is used for the voltage and predetermined voltage of the first input end, obtains comparison result；According to
The comparison result can determine cracks.
When implementation, the filter circuit is low-pass filter circuit or bandwidth-limited circuit.
When implementation, the filter circuit includes filter resistance and filter capacitor；
The first end of the filter resistance is connect with the Second terminal, the second end of the filter resistance and described first
Input terminal connection；
The first end of the filter capacitor is connect with the first input end, the second end of the filter capacitor and the second electricity
Press bond.
When implementation, the presumptive area includes the fringe region of the display panel.
When implementation, crack detection mould group of the present invention further includes that crackle determines circuit；The crackle determines that circuit is used
In determining cracks according to the comparison result.
When implementation, the first voltage is less than the predetermined voltage；The input voltage is greater than the predetermined voltage；
The crackle determines circuit for indicating the voltage of the first input end less than described pre- when the comparison result
When constant voltage, determine that there is no crackles on the display panel, and for indicating the first input end when the comparison result
Voltage be greater than or equal to the predetermined voltage when, determine that there are crackles on the display panel.
When implementation, the comparison circuit includes partial pressure sub-circuit and comparator；
The partial pressure sub-circuit is connect with the reverse input end of the Input voltage terminal and the comparator respectively, and described point
Sub-circuit is pressed to be used to divide the input voltage, to obtain the predetermined voltage；
The normal phase input end of the comparator is connect by the filter circuit with the Second terminal；The comparator
Inverting input terminal accesses the predetermined voltage；
The comparator is used for when the voltage of the normal phase input end is greater than or equal to the voltage of the inverting input terminal
High level signal is exported, the output low level letter when the voltage of the normal phase input end is less than the voltage of the inverting input terminal
Number.
When implementation, the partial pressure sub-circuit includes first resistor and second resistance；
The first end of the first resistor is connect with the Input voltage terminal, the second end of the first resistor and the ratio
Inverting input terminal compared with device connects；
The first end of the second resistance is connect with the inverting input terminal of the comparator, the second end of the second resistance
It is connect with tertiary voltage end.
The present invention also provides a kind of crack detecting methods, applied to above-mentioned crack detection mould group, the crack detection
Method includes:
Filter circuit is used to filter out making an uproar for the predetermined band in the voltage signal for the first input end for being input to comparison circuit
Psophometric voltage signal；
The voltage and predetermined voltage of the comparison circuit first input end, obtain comparison result；According to described
Comparison result can determine cracks.
When implementation, the crack detection mould group further includes that crackle determines circuit；The crack detecting method further include:
The crackle determines that circuit determines cracks according to the comparison result.
When implementation, first voltage is less than predetermined voltage；Input voltage is greater than the predetermined voltage；The comparison circuit includes
Divide sub-circuit and comparator；The normal phase input end of the comparator is connect by the filter circuit with Second terminal；It is described
The inverting input terminal of comparator accesses predetermined voltage；
The voltage and predetermined voltage of the comparison circuit first input end, obtaining comparison result step includes:
The partial pressure sub-circuit divides the input voltage, to obtain the predetermined voltage；
When the voltage of the normal phase input end of the comparator is greater than or equal to the voltage of the inverting input terminal of the comparator
When, the comparator exports high level signal, when the voltage of the normal phase input end of the comparator is less than the anti-of the comparator
When the voltage of phase input terminal, the comparator exports low level signal.
When implementation, the partial pressure sub-circuit includes first resistor and second resistance；The first end of the first resistor with it is defeated
Enter voltage end to connect, the first end of the second end of the first resistor and the second resistance all connects with the inverting input terminal
It connects, the second end of the second resistance is connect with tertiary voltage end；
The predetermined voltage is equal to V3+ ((Vin-V3) × Rz2/ (Rz1+Rz2)), wherein Rz1 is the first resistor
Resistance value, Rz2 are the resistance value of the second resistance, and V3 is the tertiary voltage of tertiary voltage end input, and Vin is input electricity
Pressure.
The present invention also provides a kind of display devices, including display panel and above-mentioned crack detection mould group.
Compared with prior art, crack detection mould group, crack detecting method and display device group of the present invention pass through
Filter circuit filters out GOA (Gate On Array, the grid being set in array substrate on detection conducting wire and display panel
Pole driving circuit) high-frequency noise caused by parasitic capacitance between cabling, comparison circuit by comparing its first input end electricity
Pressure and predetermined voltage can be determined accurately on display panel with the presence or absence of crackle.
Detailed description of the invention
Figure 1A is the structure chart of crack detection mould group described in the embodiment of the present invention；
Figure 1B is described in voltage signal and the embodiment of the present invention in crack detection mould group described in the embodiment of the present invention
Crack detection mould group in the case where not including filter circuit, the waveform diagram of the voltage signal in the crack detection mould group；
Fig. 2 is the structure chart of crack detection mould group described in another embodiment of the present invention；
Fig. 3 is the schematic diagram for the detection conducting wire that crack detection mould group includes described in the embodiment of the present invention；
Fig. 4 is the structure chart of crack detection mould group described in further embodiment of this invention；
Fig. 5 is the structure chart of crack detection mould group described in yet another embodiment of the invention；
Fig. 6 is the structure chart of crack detection mould group described in another embodiment of the present invention；
Fig. 7 is the circuit diagram of a specific embodiment of crack detection mould group of the present invention；
Fig. 8 is the flow chart of crack detecting method described in the embodiment of the present invention.
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.
The transistor used in all embodiments of the invention all can be triode, thin film transistor (TFT) or field-effect tube or its
The identical device of his characteristic.In embodiments of the present invention, to distinguish the two poles of the earth of transistor in addition to control electrode, will wherein claim a pole
For the first pole, another pole is known as the second pole.
In practical operation, when the transistor is triode, the control electrode can be base stage, and first pole can
Think collector, second pole can be with emitter；Alternatively, the control electrode can be base stage, described first can be extremely hair
Emitter-base bandgap grading, second pole can be with collector.
In practical operation, when the transistor is thin film transistor (TFT) or field-effect tube, the control electrode can be grid
Pole, described first can be extremely drain electrode, and described second extremely can be source electrode；Alternatively, the control electrode can be grid, described the
One extremely can be source electrode, and described second can be extremely drain electrode.
Crack detection mould group described in the embodiment of the present invention is applied to display panel, as shown in Figure 1A, the crack detection
Mould group includes detection conducting wire (detection conducting wire is not shown in figure 1A), filter circuit 11, resistance circuit 12 and compares
Circuit 13；
The detection conducting wire extends in the presumptive area of the display panel；The detection conducting wire includes the
One terminal PCD_B and Second terminal PCD_A；The first terminal PCD_B is connect with first voltage end VT1；The first voltage
End VT1 is for inputting first voltage；
The Second terminal PCD_A is connect by the resistance circuit 12 with Input voltage terminal, the Second terminal PCD_A
Also it is connect by the filter circuit 11 with the first input end of the comparison circuit 13；The filter circuit 11 is defeated for filtering out
Enter the noise voltage signal of the predetermined band into the voltage signal of the first input end；The Input voltage terminal is for providing
Input voltage vin；
Voltage and predetermined voltage V0 of the comparison circuit 13 for the first input end, obtain comparison result；
It can determine cracks according to the comparison result.
In the specific implementation, the comparison circuit 13 further includes the second input terminal, the second input of the comparison circuit 13
It terminates into the predetermined voltage V0.
Crack detection mould group described in the embodiment of the present invention includes detection conducting wire, filter circuit 11, resistance circuit 12
With comparison circuit 13, by filter circuit 11 filter out detection conducting wire and display panel on GOA (Gate On Array, if
It is placed in the gate driving circuit in array substrate) high-frequency noise caused by parasitic capacitance between cabling, comparison circuit 13 passes through
The voltage and predetermined voltage V0 for comparing its first input end can be determined accurately on display panel with the presence or absence of crackle.
In embodiments of the present invention, the first voltage end VT1 can be ground terminal or low-voltage end, and but not limited to this.
In the specific implementation, the predetermined voltage V0 can be selected according to the actual situation.Specifically, the predetermined voltage V0
It can be selected according to first voltage and input voltage vin.For example, when Vin be 5V, and first voltage be 0V when, the predetermined electricity
Pressure V0 can be selected as 2V-3V, and but not limited to this.
Assuming that first voltage is 0V, predetermined voltage V0 is 2V, input voltage 5V, then when the detection conducting wire exists
Constantly, the resistance between PCD_B and PCD_A is bigger for crackle, then the voltage of the first input end is greater than 2V；When the detection
When crackle is not present in conducting wire, the resistance between PCD_B and PCD_A is smaller, at this time the resistance between PCD_B and PCD_A
The resistance of conducting wire is only detected, then the voltage of the first input end is less than 2V.
In practical operation, GOA cabling and the fringe region for detecting conducting wire and being all set to display panel, GOA
Distance is especially close between cabling and the detection conducting wire, therefore holds between the GOA cabling and the detection conducting wire
It is also easy to produce parasitic capacitance.And since the signal in GOA circuit is all high-frequency signal, which can generate and pass through
PCD_A exports high frequency noise voltages signal.
As shown in Figure 1B, what VA0 was indicated is the voltage signal of PCD_A output, which carries the high-frequency noise
Voltage signal, VA1 mark is after filter circuit 11 carries out High frequency filter, and first that the comparison circuit 13 is written is defeated
Enter the voltage signal at end；By Figure 1B it is found that having high-frequency noise in the VA0 of PCD_A output, and height is carried out by filter circuit 11
The waveform for the VA1 that frequency obtains after filtering is smooth, eliminates high frequency noise voltages signal.
As shown in Figure 1B, VO0 is the comparison circuit 13 when not including filter circuit 11 in embodiment shown in figure 1A
The voltage signal of output, VO1 are the voltage signal that the comparison circuit 13 in embodiment shown in figure 1A exports；By Figure 1B it is found that
There are pulses in the waveform of VO0, and then if the voltage of the first input end of comparison circuit 13 are not eliminated by filter circuit 11
High frequency noise voltages signal in signal, then cannot be quasi- by the comparison result that its output end exports according to the comparison circuit 13
True determination crack information；And the embodiment of the present invention use filter circuit 11 after, VO1 be steady dc voltage believe
Number, it is not in the waveform of pulsed, therefore can cross and promote the accuracy that crack information determines.
In embodiments of the present invention, the filter circuit can be low-pass filter circuit or bandwidth-limited circuit.
Specifically, the filter circuit may include filter resistance and filter capacitor；
The first end of the filter resistance is connect with the Second terminal, the second end of the filter resistance and described first
Input terminal connection；
The first end of the filter capacitor is connect with the first input end, the second end of the filter capacitor and the second electricity
Press bond.
As shown in Fig. 2, on the basis of the embodiment of crack detection mould group shown in figure 1A, the filter circuit 11 includes
Filter resistance R4 and filter capacitor C1；
The first end of the filter resistance R4 is connect with the Second terminal PCD_A, the second end of the filter resistance R4
It is connect with the first input end；
The first end of the filter capacitor C1 is connect with the first input end, the second end of the filter capacitor C1 and the
Two voltage end VT2 connections.
In the specific implementation, the second voltage end VT2 can be ground terminal, or low-voltage end, but not as
Limit.
It in the embodiment shown in Figure 2, is low-pass filter circuit, low-pass filtering electricity by the filter circuit that R4 and C1 are formed
Road is used for high frequency noise voltages signal caused by filtering out the parasitic capacitance between detection conducting wire and GOA cabling.Specific real
Shi Shi, the presumptive area may include the fringe region of the display panel, and but not limited to this.
In the preferred case, the presumptive area includes the fringe region of the display panel, and but not limited to this.
As shown in figure 3, the fringe region in display panel 30 is provided with detection conducting wire DL, the detection conducting wire
DL includes first terminal PCD_B and Second terminal PCD_A.
If crack (fracture) occurs for general display panel, most first occurred position is exactly the fringe region of display panel,
So walking cabling on display panel most edge, can just play the role of detecting whether display panel is broken.
Specifically, crack detection mould group described in the embodiment of the present invention can also include that crackle determines circuit；The crackle
Determine circuit for determining cracks according to the comparison result.
As shown in figure 4, on the basis of the embodiment of crack detection mould group shown in figure 1A, described in the embodiment of the present invention
Crack detection mould group can also include that crackle determines circuit 14；
The crackle determines that circuit 14 is connect with the comparison circuit 13, for determining crackle feelings according to the comparison result
Condition.
Specifically, the first voltage can be less than the predetermined voltage；The input voltage can be greater than described predetermined
Voltage, the input voltage can be greater than the first voltage；
The crackle determines circuit for indicating the voltage of the first input end less than described pre- when the comparison result
When constant voltage, determine that there is no crackles on the display panel, and for indicating the first input end when the comparison result
Voltage be greater than or equal to the predetermined voltage when, determine that there are crackles on the display panel.
In the specific implementation, when first voltage is less than predetermined voltage, input voltage is greater than predetermined voltage, when on display panel
There is no when crackle, the voltage of first input end is less than predetermined voltage, when on display panel there are when crackle, first input end
Voltage is greater than or equal to predetermined voltage.
In practical operation, the crackle determines that circuit 14 can be control chip, can prestore in the control chip
There is the corresponding relationship of comparison result and cracks, the control chip is used to determine cracks according to comparison result；
Specifically, the control chip can be set, in the driving IC of display device, (Integrated Circuit is integrated
Circuit) in, but not limited to this.
On the basis of the embodiment of crack detection mould group shown in figure 1A, as shown in figure 5, the comparison circuit can wrap
Include partial pressure sub-circuit 131 and comparator Cmp；
The partial pressure sub-circuit 131 is connect with the reverse input end of the Input voltage terminal and the comparator Cmp respectively,
The partial pressure sub-circuit 131 is used to divide the input voltage vin, to obtain the predetermined voltage V0；The input voltage
End is used to provide the described input voltage vin；
The normal phase input end of the comparator Cmp is connect by the filter circuit 11 with the Second terminal PCD_A；Institute
The inverting input terminal for stating comparator Cmp accesses the predetermined voltage V0；
The comparator Cmp is used to be greater than or equal to the voltage of the inverting input terminal when the voltage of the normal phase input end
When export high level signal, when the voltage of the normal phase input end be less than the inverting input terminal voltage when output low level letter
Number.
In the embodiment shown in fig. 5, the positive that the first input end of the comparison circuit is the comparator Cmp inputs
End, the second input terminal of the comparison circuit are the inverting input terminal of the comparator Cmp.
The embodiment of present invention crack detection mould group as shown in Figure 5 at work, divides sub-circuit 131 to input voltage
Vin partial pressure, to obtain predetermined voltage V0, comparator Cmp compares the voltage and the predetermined voltage V0 of its normal phase input end, and works as
The voltage of the normal phase input end exports high level signal when being greater than or equal to the predetermined voltage V0, when the electricity of the normal phase input end
Pressure exports low level signal when being less than the predetermined voltage.
Specifically, the partial pressure sub-circuit may include first resistor and second resistance；
The first end of the first resistor is connect with the Input voltage terminal, the second end of the first resistor and the ratio
Inverting input terminal compared with device connects；
The first end of the second resistance is connect with the inverting input terminal of the comparator, the second end of the second resistance
It is connect with tertiary voltage end；The tertiary voltage end is for inputting tertiary voltage V3；
The then voltage of the first end of the second resistance namely predetermined voltage V0；
V0=V3+ ((Vin-V3) × Rz2/ (Rz1+Rz2))；
Wherein, Rz1 is the resistance value of the first resistor, and Rz is the resistance value of the second resistance, and Vin is input electricity
Pressure.
In the specific implementation, the tertiary voltage end can be ground terminal, or low-voltage end, but not limited to this.
On the basis of the embodiment of crack detection mould group shown in Fig. 5, as shown in fig. 6, the partial pressure sub-circuit 131 can
To include first resistor R1 and second resistance R2；
The first end of the first resistor R1 is connect with the Input voltage terminal, the second end of the first resistor R1 and institute
State the inverting input terminal connection of comparator Cmp；
The first end of the second resistance R2 is connect with the inverting input terminal of the comparator Cmp, the second resistance R2
Second end connect with ground terminal GND.
In the embodiment shown in fig. 5, tertiary voltage end is ground terminal, and tertiary voltage V3 is equal to 0；After R1 and R2 partial pressure
Predetermined voltage V0 is equal to Vin × Rz2/ (Rz1+Rz2), wherein Rz1 is the resistance value of R1, and Rz2 is the resistance value of R2.
In the specific implementation, in the embodiment shown in fig. 6, the resistance circuit 12 may include 3rd resistor.
Illustrate crack detection mould group of the present invention below by a specific embodiment.
As shown in fig. 7, a specific embodiment of crack detection mould group described in the embodiment of the present invention includes detection conductor wire
Road (detection conducting wire is the detection conducting wire DL in Fig. 3), filter circuit, resistance circuit and comparison circuit；
The detection conducting wire extends in the fringe region of the display panel；The detection conducting wire includes the
One terminal PCD_B and Second terminal PCD_A；The first terminal PCD_B is connect with ground terminal GND；
The comparison circuit includes partial pressure sub-circuit and comparator Cmp；The partial pressure sub-circuit include first resistor R1 and
Second resistance R2；The resistance circuit includes 3rd resistor R3；
The Second terminal PCD_A is connect by 3rd resistor R3 with Input voltage terminal, and the Input voltage terminal is for mentioning
For input voltage vin；
The filter circuit includes filter resistance R4 and filter capacitor C1；
The first end of the filter resistance R4 is connect with the Second terminal PCD_A, the second end of the filter resistance R4
It is connect with the normal phase input end of the comparator Cmp；
The first end of the filter capacitor C1 is connect with the normal phase input end of the comparator Cmp, the filter capacitor C1
Second end connect with ground terminal GND；
The first end of the first resistor R1 is connect with the Input voltage terminal, the second end of the first resistor R1 and institute
State the inverting input terminal connection of comparator Cmp；
The first end of the second resistance R2 is connect with the inverting input terminal of the comparator Cmp, the second resistance R2
Second end connect with ground terminal GND.
In the specific embodiment of crack detection mould group shown in Fig. 7, Vin is equal to 5V, and but not limited to this.
The specific embodiment of present invention crack detection mould group as shown in Figure 7 at work, obtains after R1 and R2 partial pressure
Predetermined voltage be equal to Vin × Rz2/ (Rz1+Rz2), wherein Rz1 be R1 resistance value, Rz2 be R2 resistance value.Pass through tune
Save the adjustable predetermined voltage of Rz1 and Rz2.
In specific embodiment shown in Fig. 7, it can set equal for Rz1 and Rz2, then the scheduled voltage is
2.5V；
When, there are when crackle, the resistance between PCD_B and PCD_A is big, then the positive of Cmp is defeated in the detection conducting wire
The voltage for entering end is greater than or equal to 2.5V, and Cmp exports high level signal；When crackle is not present in the detection conducting wire,
Resistance between PCD_B and PCD_A is small, then the small 2.5V of the voltage of the normal phase input end of Cmp, and Cmp exports low level signal.
Crack detecting method described in the embodiment of the present invention, applied to above-mentioned crack detection mould group, as shown in figure 8, institute
Stating crack detecting method includes:
S1: filter circuit is used to filter out the predetermined band in the voltage signal for the first input end for being input to comparison circuit
Noise voltage signal；
S2: the voltage and predetermined voltage of the comparison circuit first input end obtain comparison result；According to institute
Stating comparison result can determine cracks.
Crack detecting method described in the embodiment of the present invention filters out detection conducting wire and display panel by filter circuit
On GOA cabling between parasitic capacitance caused by high-frequency noise, comparison circuit by comparing its first input end voltage with
Predetermined voltage can be determined accurately on display panel with the presence or absence of crackle.
Specifically, the crack detection mould group can also include that crackle determines circuit；The crack detecting method further include:
The crackle determines that circuit determines cracks according to the comparison result.
Specifically, first voltage is less than predetermined voltage；Input voltage is greater than the predetermined voltage；The comparison circuit includes
Divide sub-circuit and comparator；The normal phase input end of the comparator is connect by the filter circuit with Second terminal；It is described
The inverting input terminal of comparator accesses predetermined voltage；
The voltage and predetermined voltage of the comparison circuit first input end, obtaining comparison result step includes:
The partial pressure sub-circuit divides the input voltage, to obtain the predetermined voltage；
When the voltage of the normal phase input end of the comparator is greater than or equal to the voltage of the inverting input terminal of the comparator
When, the comparator exports high level signal, when the voltage of the normal phase input end of the comparator is less than the anti-of the comparator
When the voltage of phase input terminal, the comparator exports low level signal.
In embodiments of the present invention, the comparison circuit may include partial pressure sub-circuit and comparator, divide sub-circuit pair
Input voltage vin partial pressure, to obtain predetermined voltage, comparator compares the voltage and the predetermined voltage of its normal phase input end, and
High level signal is exported when the voltage of the normal phase input end is greater than or equal to the predetermined voltage, when the electricity of the normal phase input end
Pressure exports low level signal when being less than the predetermined voltage.
Specifically, the partial pressure sub-circuit includes first resistor and second resistance；The first end of the first resistor with it is defeated
Enter voltage end to connect, the first end of the second end of the first resistor and the second resistance all connects with the inverting input terminal
It connects, the second end of the second resistance is connect with tertiary voltage end；
The predetermined voltage is equal to V3+ ((Vin-V3) × Rz2/ (Rz1+Rz2)), wherein Rz1 is the first resistor
Resistance value, Rz2 are the resistance value of the second resistance, and V3 is the tertiary voltage of tertiary voltage end input, and Vin is input electricity
Pressure.Display device described in the embodiment of the present invention includes display panel and above-mentioned crack detection mould group.
Display device provided by the embodiment of the present invention can be mobile phone, tablet computer, television set, display, notebook
Any products or components having a display function such as computer, Digital Frame, navigator.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (13)
1. a kind of crack detection mould group is applied to display panel, which is characterized in that the crack detection mould group includes that detection is conductive
Route, filter circuit, resistance circuit and comparison circuit；
The detection conducting wire extends in the presumptive area of the display panel；The detection conducting wire includes first end
Son and Second terminal；The first terminal is connect with first voltage end；The first voltage end is for inputting first voltage；
The Second terminal is connect by the resistance circuit with Input voltage terminal, and the Second terminal also passes through the filtered electrical
Road is connect with the first input end of the comparison circuit；The filter circuit is for filtering out the electricity for being input to the first input end
Press the noise voltage signal of the predetermined band in signal；The Input voltage terminal is for providing input voltage；
The comparison circuit is used for the voltage and predetermined voltage of the first input end, obtains comparison result；According to described
Comparison result can determine cracks.
2. crack detection mould group as described in claim 1, which is characterized in that the filter circuit is low-pass filter circuit or band
Bandpass filter circuit.
3. crack detection mould group as described in claim 1, which is characterized in that the filter circuit includes filter resistance and filtering
Capacitor；
The first end of the filter resistance is connect with the Second terminal, the second end of the filter resistance and first input
End connection；
The first end of the filter capacitor is connect with the first input end, the second end of the filter capacitor and second voltage end
Connection.
4. the crack detection mould group as described in any claim in claims 1 to 3, which is characterized in that the presumptive area
Fringe region including the display panel.
5. the crack detection mould group as described in any claim in claims 1 to 3, which is characterized in that further include that crackle is true
Determine circuit；The crackle determines circuit for determining cracks according to the comparison result.
6. crack detection mould group as claimed in claim 5, which is characterized in that the first voltage is less than the predetermined voltage；
The input voltage is greater than the predetermined voltage；
The crackle determines circuit for indicating the voltage of the first input end less than the predetermined electricity when the comparison result
When pressure, determine that there is no crackles on the display panel, and the electricity for indicating the first input end when the comparison result
When pressure is greater than or equal to the predetermined voltage, determine that there are crackles on the display panel.
7. the crack detection mould group as described in any claim in claims 1 to 3, which is characterized in that the comparison circuit
Including partial pressure sub-circuit and comparator；
The partial pressure sub-circuit is connect with the reverse input end of the Input voltage terminal and the comparator respectively, partial pressure
Circuit is used to divide the input voltage, to obtain the predetermined voltage；
The normal phase input end of the comparator is connect by the filter circuit with the Second terminal；The reverse phase of the comparator
Input terminal accesses the predetermined voltage；
The comparator is used to export when the voltage of the normal phase input end is greater than or equal to the voltage of the inverting input terminal
High level signal exports low level signal when the voltage of the normal phase input end is less than the voltage of the inverting input terminal.
8. crack detection mould group as claimed in claim 7, which is characterized in that the partial pressure sub-circuit includes first resistor and
Two resistance；
The first end of the first resistor is connect with the Input voltage terminal, the second end of the first resistor and the comparator
Inverting input terminal connection；
The first end of the second resistance is connect with the inverting input terminal of the comparator, the second end of the second resistance and the
The connection of three voltage ends.
9. a kind of crack detecting method, which is characterized in that applied to splitting as described in any claim in claim 1 to 8
Line detects mould group, and the crack detecting method includes:
Filter circuit is used to filter out the noise electricity of the predetermined band in the voltage signal for the first input end for being input to comparison circuit
Press signal；
The voltage and predetermined voltage of the comparison circuit first input end, obtain comparison result；According to the comparison
As a result cracks be can determine.
10. crack detecting method as claimed in claim 9, which is characterized in that the crack detection mould group further includes that crackle is true
Determine circuit；The crack detecting method further include:
The crackle determines that circuit determines cracks according to the comparison result.
11. the crack detecting method as described in claim 9 or 10, which is characterized in that first voltage is less than predetermined voltage；Input
Voltage is greater than the predetermined voltage；The comparison circuit includes partial pressure sub-circuit and comparator；The positive of the comparator inputs
End is connect by the filter circuit with Second terminal；The inverting input terminal of the comparator accesses predetermined voltage；
The voltage and predetermined voltage of the comparison circuit first input end, obtaining comparison result step includes:
The partial pressure sub-circuit divides the input voltage, to obtain the predetermined voltage；
When the voltage of the normal phase input end of the comparator is greater than or equal to the voltage of the inverting input terminal of the comparator, institute
Comparator output high level signal is stated, when the voltage of the normal phase input end of the comparator is less than the anti-phase input of the comparator
When the voltage at end, the comparator exports low level signal.
12. crack detecting method as claimed in claim 11, which is characterized in that the partial pressure sub-circuit include first resistor and
Second resistance；The first end of the first resistor is connect with Input voltage terminal, the second end of the first resistor and described second
The first end of resistance is all connect with the inverting input terminal, and the second end of the second resistance is connect with tertiary voltage end；
The predetermined voltage is equal to V3+ ((Vin-V3) × Rz2/ (Rz1+Rz2)), wherein Rz1 is the resistance of the first resistor
Value, Rz2 are the resistance value of the second resistance, and V3 is the tertiary voltage of tertiary voltage end input, and Vin is input voltage.
13. a kind of display device, which is characterized in that including display panel and as described in any claim in claim 1 to 8
Crack detection mould group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910079826.4A CN109682856A (en) | 2019-01-28 | 2019-01-28 | Crack detection mould group, crack detecting method and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910079826.4A CN109682856A (en) | 2019-01-28 | 2019-01-28 | Crack detection mould group, crack detecting method and display device |
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| CN109682856A true CN109682856A (en) | 2019-04-26 |
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| CN201910079826.4A Pending CN109682856A (en) | 2019-01-28 | 2019-01-28 | Crack detection mould group, crack detecting method and display device |
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