CN108614366A - The measuring device of display panel - Google Patents
The measuring device of display panel Download PDFInfo
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- CN108614366A CN108614366A CN201810207505.3A CN201810207505A CN108614366A CN 108614366 A CN108614366 A CN 108614366A CN 201810207505 A CN201810207505 A CN 201810207505A CN 108614366 A CN108614366 A CN 108614366A
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- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 230000005611 electricity Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 208000003464 asthenopia Diseases 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
The invention discloses a kind of measuring devices of display panel, including：Photocell lens, for acquiring the first optical signal under flicker picture or the second optical signal under grey menu；Photoelectric switching circuit is connect with photocell lens, for the first optical signal and the second optical signal to be converted into the first electric signal and the second electric signal respectively；Stroboscopic measuring circuit, for being handled the first electric signal to obtain strobe signal；Brightness measuring circuit, for being handled the second electric signal to obtain luminance signal；Microprocessor is connect with stroboscopic measuring circuit and brightness measuring circuit respectively, for being handled to obtain stroboscopic value to strobe signal or being handled luminance signal to obtain brightness value；Selected on-off circuit is connect with microprocessor, for being connected to photoelectric switching circuit with stroboscopic measuring circuit according to selection signal or being connected to photoelectric switching circuit with brightness measuring circuit.
Description
Technical field
The invention belongs to display apparatus test fields, more particularly, to a kind of measuring device of display panel.
Background technology
Currently, liquid crystal module when showing picture, always has a degree of flicker (Flicker) phenomenon, and flicker
When phenomenon is serious, not only seriously affected the display effect of liquid crystal module, but also can cause observer visual fatigue and its
It is uncomfortable, so the stroboscopic of every piece of liquid crystal display panel and brightness must be measured before manufacture, and according to measured value tune
Whole relevant parameter makes the stroboscopic of picture be minimized value, improves viewing effect.Public electrode voltages are that liquid crystal display panel is public
Voltage on electrode is determined by the characteristic of liquid crystal and the operation principle of liquid crystal module, during the use of liquid crystal display panel,
Since the polarity switching of public electrode voltages can cause liquid crystal display panel scintillation occur, by adjusting public electrode
Voltage can adjust the flicker degree of liquid crystal display panel to minimum, to make the display effect of liquid crystal display panel reach most
It is good.
Currently, under our brightness and the flicker pictures using color analysis instrument (CA-310) to measure liquid crystal display panel
Stroboscopic.But the color analysis instrument can not coordinate the public electrode voltages for realizing automatic adjustment liquid crystal display panel with signal source
The stroboscopic under flicker picture is set to be preferably minimized.And grayscale can not be automatically adjusted to measure each gray-scale intensity and can not be from animation
Go out gamma curve.
Invention content
The purpose of the present invention is to provide a kind of measuring devices of display panel.
According to an aspect of the present invention, a kind of measuring device of display panel is provided, including：
Photocell lens, for acquiring the first optical signal under flicker picture or the second optical signal under grey menu；
Photoelectric switching circuit is connect with the photocell lens, is used for first optical signal and second optical signal
It is converted into the first electric signal and the second electric signal respectively；
Stroboscopic measuring circuit, for being handled first electric signal to obtain strobe signal；
Brightness measuring circuit, for being handled second electric signal to obtain luminance signal；
Microprocessor is connect with the stroboscopic measuring circuit and brightness measuring circuit respectively, for believing the stroboscopic
It number is handled to obtain stroboscopic value or the luminance signal is handled to obtain brightness value；
Selected on-off circuit is connect with the microprocessor, for according to selection signal by the photoelectric switching circuit with
The photoelectric switching circuit is connected to by the stroboscopic measuring circuit connection with the brightness measuring circuit.
Preferably, the photoelectric switching circuit is also amplified processing to the first electric signal and the second electric signal.
Preferably, the photoelectric switching circuit includes photodiode, the first operational amplifier, the first capacitance and the first electricity
Resistance；
Wherein, the anode of photodiode is connect with the second input terminal and ground terminal of the first operational amplifier, cathode
It is connect with the first input end of the first operational amplifier；
First capacitance and first resistor are connected in parallel between the first input end and output end of the first operational amplifier.
Preferably, the selected on-off circuit includes first port to third port, wherein first port and the photoelectricity
Conversion circuit connects, and second port is connect with the stroboscopic measuring circuit, and third port is connect with the brightness measuring circuit；
Wherein, the selected on-off circuit further includes selection port, is connect with the microprocessor, for being believed according to selection
It number will be connected between first port and second port or between first port and third port.
Preferably, the microprocessor also provides the first ginseng respectively to the stroboscopic measuring circuit and brightness measuring circuit
Voltage and the second reference voltage are examined, and control signal is provided to the brightness measuring circuit.
Preferably, the stroboscopic measuring circuit includes：
First filter circuit generates the first AC signal for filtering out the direct current signal in first electric signal；
First measuring circuit generates stroboscopic letter for first AC signal to be superimposed with first reference voltage
Number.
Preferably, first filter circuit includes the second capacitance, second resistance and the 4th resistance,
Second capacitance, second resistance and the 4th resistance be connected in series in the selected on-off circuit second port and connect
Between ground terminal；
Node between second resistance and the 4th resistance exports the first AC signal.
Preferably, the first measuring circuit include third capacitance, the 4th capacitance, 3rd resistor, the 5th resistance and the 6th resistance,
Second operational amplifier and third operational amplifier；
The first input end of second operational amplifier receives the first AC signal, the second input terminal via the 5th resistance with connect
Ground terminal connects, and output end is connect via the 6th resistance with the second input terminal；
The first input end of third operational amplifier receives the first reference voltage, and the second input terminal is connected with output end；
3rd resistor is connected to the output end of the first input end and third operational amplifier of the second operational amplifier
Between.
Preferably, the stroboscopic measuring circuit includes：
Second filter circuit generates the second direct current signal for filtering out the AC signal in second electric signal；
Bleeder circuit, for generating voltage division signal according to second direct current signal；
Second measuring circuit is superimposed generation for being amplified to the voltage division signal, and with second reference voltage
Luminance signal.
Preferably, second filter circuit includes the 5th capacitance, and the bleeder circuit includes the 7th resistance and the 8th electricity
Resistance, second measuring circuit are put including the 6th capacitance, the 7th capacitance, the 9th resistance, four-operational amplifier and the 5th operation
Big device；
5th capacitance connection is between the third port and ground terminal of the switch selection circuit；
7th resistance and the 8th resistance are connected in series between the third port and ground terminal of the switch selection circuit；
9th resistance is variable resistance, and the output end and the 5th operation for being connected to the four-operational amplifier are put
Between the output end of big device；
Node connection between the first input end of the four-operational amplifier and the 7th resistance and the 8th resistance,
Second input terminal is connect with the control terminal of the 9th resistance；
The first input end of 5th operational amplifier receives the second reference voltage, and the second input terminal is connect with output end；
6th capacitance and the 7th capacitance be connected in parallel the 5th operational amplifier first input end and ground terminal it
Between.
Preferably, the signal source is additionally operable to adjust the stroboscopic of display panel according to the stroboscopic value and according to described bright
Angle value adjusts the brightness of display panel.
The measuring device of display panel provided in an embodiment of the present invention, the stroboscopic that display panel is acquired by photocell lens are believed
Number and luminance signal, stroboscopic value and brightness value are obtained according to strobe signal and luminance signal, and according to the stroboscopic value tune
It saves the stroboscopic of display panel and adjusts the brightness of display panel according to the brightness value, with automatic measurement or display surface can be adjusted
The stroboscopic of plate and brightness, it is at low cost, it is small.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 shows the structural schematic diagram of the measuring device of the display panel provided according to embodiments of the present invention；
Fig. 2 shows the circuit diagrams of the measuring device of the display panel of offer according to embodiments of the present invention；
Fig. 3 shows the signal waveforms in the stroboscopic measuring circuit provided according to embodiments of the present invention；
Fig. 4 shows the signal waveforms in the brightness measuring circuit provided according to embodiments of the present invention.
Specific implementation mode
Hereinafter reference will be made to the drawings is more fully described various embodiments of the present invention.In various figures, identical element
It is indicated using same or similar reference numeral.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.
The present invention can be presented in a variety of manners, some of them example explained below.
Fig. 1 shows the structural schematic diagram of the measuring device of the display panel provided according to embodiments of the present invention.Fig. 2 shows
The circuit diagram of the measuring device of the display panel of offer according to embodiments of the present invention.As shown in Figure 1, the survey of the display panel
It includes photocell lens 101, photoelectric switching circuit 102, stroboscopic measuring circuit 103, brightness measuring circuit 104, microprocessor to measure device
Device 105, selected on-off circuit 106 and signal source 107.
Wherein, photocell lens 101 are used to acquire the first optical signal under flicker picture or the second light letter under grey menu
Number.
In the present embodiment, (each grey menu corresponds to one for driving display panel display flicker picture or grey menu
A brightness value), and acquire the first optical signal in the case where flickering picture respectively or acquire the second optical signal under grey menu.
Photoelectric switching circuit 102 is connect with the photocell lens 101, is used for first optical signal and described second
Optical signal is converted into the first electric signal S1 and the second electric signal L1 respectively.
In the present embodiment, the first electric signal S1 and the second electric signal L1 is the superposition letter of direct current signal and AC signal
Number.
In a preferred embodiment, the photoelectric switching circuit 102 is also to the first electric signal S1 and the second electric signal
L1 is amplified processing.As shown in Fig. 2, the photoelectric switching circuit 102 includes photodiode PD, the first operational amplifier
U1, the first capacitance C1 and first resistor R1.Wherein, the second input of the anode of photodiode PD and the first operational amplifier U1
End and ground terminal GND connections, cathode are connect with the first input end of the first operational amplifier U1；The electricity of first capacitance C1 and first
Resistance R1 is connected in parallel between the first input end and output end of the first operational amplifier U1.
Stroboscopic measuring circuit 103 is for handling to obtain strobe signal S3 the first electric signal S1.
In the present embodiment, stroboscopic measuring circuit 103 filters out the direct current signal in the first electric signal S1 to generate first
AC signal S2, and the first AC signal S2 is superimposed with the first reference voltage Vref 1 and generates strobe signal S3.
Brightness measuring circuit 104 is for handling to obtain luminance signal L3 the second electric signal L1.
In the present embodiment, brightness measuring circuit 104 filters out the AC signal in the second electric signal L1 to generate second
Direct current signal L2, and partial pressure is carried out to the second direct current signal L2 and generates voltage division signal, then voltage division signal is amplified,
And it is superimposed with the second reference voltage Vref 2 and generates luminance signal L3.
Microprocessor 105 is connect with the stroboscopic measuring circuit 103 and brightness measuring circuit 104 respectively, for institute
Strobe signal S3 processing is stated to obtain stroboscopic value or obtain brightness value to the luminance signal L3 processing.
In the present embodiment, the microprocessor 105 is also to the stroboscopic measuring circuit 103 and brightness measuring circuit
104 provide the first reference voltage Vref 1 and the second reference voltage Vref 2 respectively, and are provided to the brightness measuring circuit 104
Second control signal.The second control signal is used to control the amplification coefficient in brightness measuring circuit 104 to voltage division signal.
Selected on-off circuit 106 is connect with the microprocessor 105, for according to selection signal that the opto-electronic conversion is electric
Road 102 is connected to the stroboscopic measuring circuit 103 or by the photoelectric switching circuit 102 and the brightness measuring circuit 104
Connection.
In the present embodiment, the selected on-off circuit 106 includes first port to third port, wherein first port
Connect with the photoelectric switching circuit 102, second port is connect with the stroboscopic measuring circuit 103, third port with it is described bright
Measuring circuit 104 is spent to connect.
In a preferred embodiment, the selected on-off circuit 106 further includes selection port, with the microprocessor
105 connections, for will be connected between first port and second port or between first port and third port according to selection signal
It is logical.
Signal source 107 is connect with the microprocessor 105, for driving display panel display to dodge according to first control signal
Bright picture or grey menu.
In the present embodiment, microprocessor 105 provides first control signal to signal source 107, and signal source 107 is according to first
Control signal driving display panel display flicker picture or grey menu.
In a preferred embodiment, the signal source 107 is additionally operable to adjust display panel according to the stroboscopic value
Stroboscopic and the brightness that display panel is adjusted according to the brightness value.
Specifically, signal source 107 drives display panel to show stroboscopic picture according to first control signal, and simultaneous selection is opened
Photoelectric switching circuit 102 is connected to by powered-down road 106 according to selection signal with stroboscopic measuring circuit 103.Microprocessor 105 receives frequency
The strobe signal S3 that measuring circuit 103 is sent is dodged, strobe signal S3 is transformed by frequency domain from time domain by Fourier transformation, and will
The stroboscopic value got is sent to signal source 107, and the stroboscopic that signal source 107 adjusts display panel according to the stroboscopic value makes under it
It minimizes.
Signal source 107 is according to first control signal by the display screen switching of display panel to grey menu, simultaneous selection
Photoelectric switching circuit 102 is connected to by switching circuit 106 according to selection signal with brightness measuring circuit 104.Microprocessor 105 receives
The luminance signal L3 that brightness measuring circuit 104 is sent, and the brightness value got is sent to signal source 107, signal source 107
The brightness of display panel is adjusted according to the brightness value.
In the present embodiment, stroboscopic measuring circuit 103 includes the first filter circuit 1031 and the first measuring circuit 1032,
In, the direct current signal that the first filter circuit 1031 is used to filter out in the first electric signal S1 generates the first AC signal S2；The
One measuring circuit 1032, which is used to the first AC signal S2 being superimposed with first reference voltage Vref 1, generates strobe signal
S3。
Fig. 3 shows the signal waveforms in the stroboscopic measuring circuit provided according to embodiments of the present invention.As shown in figure 3,
First electric signal S1 includes direct current signal and AC signal；Since the change of stroboscopic picture brightness can cause in the first electric signal S1 directly
The variation of flow component, therefore the first AC signal S2 is obtained after the direct current signal in the first electric signal S1 is filtered out.First exchange
Signal S2S2 half is negative voltage, and negative voltage can not be acquired by the analog-digital converter in microprocessor 105, therefore the
It is superimposed a direct current signal (i.e. the first reference voltage) on one AC signal S2 and obtains strobe signal S3.
Wherein, first filter circuit 1031 includes the second capacitance C2, second resistance R2 and the 4th resistance R4, the second electricity
Hold C2, second resistance R2 and the 4th resistance R4 and is connected in series in second port and ground terminal in the selected on-off circuit 106
Between GND；Node between second resistance R2 and the 4th resistance R4 exports the first AC signal S2.
First measuring circuit 1032 includes third capacitance C3, the 4th capacitance C4,3rd resistor R3, the 5th resistance R5 and the 6th
Resistance R6, second operational amplifier U2 and third operational amplifier U3；The first input end of second operational amplifier U2 receives the
One AC signal S2, the second input terminal are connect via the 5th resistance R5 with ground terminal, and output end is via the 6th resistance R6 and second
Input terminal connects；The first input end of third operational amplifier U3 receives the first reference voltage Vref 1, the second input terminal and output
End connection；3rd resistor R3 be connected to the second operational amplifier U2 first input end and third operational amplifier U3 it is defeated
Between outlet.
Fig. 4 shows the signal waveforms in the brightness measuring circuit provided according to embodiments of the present invention.As shown in figure 4,
Second electric signal L1 includes direct current signal and AC signal；It is straight that second is obtained after AC signal in second electric signal L1 is filtered out
Flow signal L2.Variation ranges of the second direct current signal L2 in brightness change may be very big, it is possible to more than 3.3V so that micro- place
Reason device 105 can not acquire or voltage is too small so that the measurement result of microprocessor 105 is inaccurate.Therefore, by partial pressure and
After enhanced processing, then it is superimposed a direct current signal (i.e. the second reference voltage) and obtains luminance signal L3.Second direct current signal in Fig. 4
L is larger, and the luminance signal L3 acquired for microprocessor 105 is obtained after diminution.
Brightness measuring circuit 104 includes the second filter circuit 1041, bleeder circuit 1042 and the second measuring circuit 1043,
In, the AC signal that the second filter circuit 1041 is used to filter out in the second electric signal L1 generates the second direct current signal L2；Point
Volt circuit 1042 is used to generate voltage division signal according to the second direct current signal L2；Second measuring circuit 1043 is used for described point
Pressure signal is amplified, and is superimposed with second reference voltage Vref 2 and is generated luminance signal L3.
Wherein, second filter circuit 1041 includes the 5th capacitance C5, and the bleeder circuit 1042 includes the 7th resistance
R7 and the 8th resistance R8, second measuring circuit 1043 include the 6th capacitance C6, the 7th capacitance C7, the 9th resistance R9, the 4th
Operational amplifier U4 and the 5th operational amplifier U5；5th capacitance C5 is connected to the third port of the switch selection circuit 106
Between ground terminal；7th resistance R7 and the 8th resistance R8 be connected in series in the switch selection circuit 106 third port and
Between ground terminal；9th resistance R9 is variable resistance, is connected to the output end and described the of the four-operational amplifier U4
Between the output end of five operational amplifier U5；The first input end of the four-operational amplifier U4 and the 7th resistance R7 and
Node connection between 8th resistance R8, the second input terminal are connect with the control terminal of the 9th resistance R9；5th operational amplifier U5
First input end receive the second reference voltage Vref 2, the second input terminal connect with output end；6th capacitance C6 and the 7th capacitance
C7 is connected in parallel between the first input end and ground terminal of the 5th operational amplifier U5.
In the present embodiment, the 9th resistance R9 is variable resistance, the second control signal provided by microprocessor 105
The position of its control terminal is controlled, and then controls the amplification coefficient of four-operational amplifier U4.The 4th in second measuring circuit 1043
The amplification formula of operational amplifier U4 is：
Wherein, Vin4For the input voltage of the first input end of four-operational amplifier U4, Vout4For four-operational amplifier
The output voltage of the output end of U4, x/256 are the dividing ratios of the 9th resistance R9.
The measuring device of display panel provided in an embodiment of the present invention, the stroboscopic that display panel is acquired by photocell lens are believed
Number and luminance signal, stroboscopic value and brightness value are obtained according to strobe signal and luminance signal, and according to the stroboscopic value tune
It saves the stroboscopic of display panel and adjusts the brightness of display panel according to the brightness value, with automatic measurement or display surface can be adjusted
The stroboscopic of plate and brightness, it is at low cost, it is small.
As described above according to the embodiment of the present invention, there is no all details of detailed descriptionthe for these embodiments, also not
Limit the specific embodiment that the invention is only described.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is in order to preferably explain the principle of the present invention and practical application, belonging to making
Technical field technical staff can utilize modification of the invention and on the basis of the present invention to use well.The protection model of the present invention
The range that the claims in the present invention are defined should be subject to by enclosing.
Claims (10)
1. a kind of measuring device of display panel, which is characterized in that including：
Photocell lens, for acquiring the first optical signal under flicker picture or the second optical signal under grey menu；
Photoelectric switching circuit is connect with the photocell lens, for distinguishing first optical signal and second optical signal
It is converted into the first electric signal and the second electric signal；
Stroboscopic measuring circuit, for being handled first electric signal to obtain strobe signal；
Brightness measuring circuit, for being handled second electric signal to obtain luminance signal；
Microprocessor is connect with the stroboscopic measuring circuit and brightness measuring circuit respectively, for the strobe signal into
Row processing obtains stroboscopic value or is handled to obtain brightness value to the luminance signal；
Selected on-off circuit is connect with the microprocessor, for according to selection signal by the photoelectric switching circuit with it is described
Stroboscopic measuring circuit is connected to or is connected to the photoelectric switching circuit with the brightness measuring circuit；
Signal source, for driving display panel display flicker picture or grey menu according to first control signal.
2. measuring device according to claim 1, which is characterized in that the photoelectric switching circuit also to the first electric signal and
Second electric signal is amplified processing.
3. measuring device according to claim 2, which is characterized in that the photoelectric switching circuit include photodiode,
First operational amplifier, the first capacitance and first resistor；
Wherein, the anode of photodiode is connect with the second input terminal and ground terminal of the first operational amplifier, cathode and the
The first input end of one operational amplifier connects；
First capacitance and first resistor are connected in parallel between the first input end and output end of the first operational amplifier.
4. measuring device according to claim 1, which is characterized in that the selected on-off circuit includes first port to
Three ports, wherein first port is connect with the photoelectric switching circuit, and second port is connect with the stroboscopic measuring circuit, the
Three ports are connect with the brightness measuring circuit；
Wherein, the selected on-off circuit further includes selection port, is connect with the microprocessor, and being used for will according to selection signal
It is connected between first port and second port or between first port and third port.
5. measuring device according to claim 4, which is characterized in that the microprocessor is also to the stroboscopic measuring circuit
And brightness measuring circuit provides the first reference voltage and the second reference voltage respectively, and provided to the brightness measuring circuit
Second control signal.
6. measuring device according to claim 5, which is characterized in that the stroboscopic measuring circuit includes：
First filter circuit generates the first AC signal for filtering out the direct current signal in first electric signal；
First measuring circuit generates strobe signal for first AC signal to be superimposed with first reference voltage.
7. measuring device according to claim 6, which is characterized in that first filter circuit includes the second capacitance, the
Two resistance and the 4th resistance, the first measuring circuit include third capacitance, the 4th capacitance, 3rd resistor, the 5th resistance and the 6th electricity
Resistance, second operational amplifier and third operational amplifier；
Second capacitance, second resistance and the 4th resistance are connected in series in second port and ground terminal in the selected on-off circuit
Between；
Node between second resistance and the 4th resistance exports the first AC signal；
The first input end of second operational amplifier receives the first AC signal, and the second input terminal is via the 5th resistance and ground terminal
Connection, output end are connect via the 6th resistance with the second input terminal；
The first input end of third operational amplifier receives the first reference voltage, and the second input terminal is connected with output end；
3rd resistor is connected between the first input end of the second operational amplifier and the output end of third operational amplifier.
8. measuring device according to claim 5, which is characterized in that the stroboscopic measuring circuit includes：
Second filter circuit generates the second direct current signal for filtering out the AC signal in second electric signal；
Bleeder circuit, for generating voltage division signal according to second direct current signal；
Second measuring circuit for being amplified to the voltage division signal, and is superimposed with second reference voltage and generates brightness
Signal.
9. measuring device according to claim 8, which is characterized in that second filter circuit includes the 5th capacitance, institute
It includes the 7th resistance and the 8th resistance to state bleeder circuit, and second measuring circuit includes the 6th capacitance, the 7th capacitance, the 9th electricity
Resistance, four-operational amplifier and the 5th operational amplifier；
5th capacitance connection is between the third port and ground terminal of the switch selection circuit；
7th resistance and the 8th resistance are connected in series between the third port and ground terminal of the switch selection circuit；
9th resistance is variable resistance, is connected to the output end of the four-operational amplifier and the 5th operational amplifier
Output end between；
Node connection between the first input end of the four-operational amplifier and the 7th resistance and the 8th resistance, second
Input terminal is connect with the control terminal of the 9th resistance；
The first input end of 5th operational amplifier receives the second reference voltage, and the second input terminal is connect with output end；
6th capacitance and the 7th capacitance are connected in parallel between the first input end and ground terminal of the 5th operational amplifier.
10. measuring device according to claim 1, which is characterized in that the signal source is additionally operable to according to the stroboscopic value
It adjusts the stroboscopic of display panel and adjusts the brightness of display panel according to the brightness value.
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| CN201810207505.3A CN108614366B (en) | 2018-03-14 | 2018-03-14 | Measuring device of display panel |
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|---|---|---|---|
| CN201810207505.3A CN108614366B (en) | 2018-03-14 | 2018-03-14 | Measuring device of display panel |
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| CN108614366B CN108614366B (en) | 2021-05-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110428761A (en) * | 2019-07-10 | 2019-11-08 | 武汉精立电子技术有限公司 | A kind of method, apparatus and system of non-contact measurement Flicker value of liquid crystal module |
| CN110942738A (en) * | 2019-12-04 | 2020-03-31 | 惠州市华星光电技术有限公司 | Measurement device and measurement method for flicker value of display panel |
| CN111076812A (en) * | 2019-12-26 | 2020-04-28 | 惠州市华星光电技术有限公司 | Optical brightness measuring system and optical brightness measuring method |
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