CN108614366B - Measuring device of display panel - Google Patents
Measuring device of display panel Download PDFInfo
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- CN108614366B CN108614366B CN201810207505.3A CN201810207505A CN108614366B CN 108614366 B CN108614366 B CN 108614366B CN 201810207505 A CN201810207505 A CN 201810207505A CN 108614366 B CN108614366 B CN 108614366B
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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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- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
The invention discloses a measuring device of a display panel, comprising: the photoelectric lens is used for collecting a first optical signal under a flickering picture or a second optical signal under a gray-scale picture; the photoelectric conversion circuit is connected with the photoelectric lens and used for converting the first optical signal and the second optical signal into a first electric signal and a second electric signal respectively; a strobe measurement circuit for processing the first electrical signal to obtain a strobe signal; the brightness measuring circuit is used for processing the second electric signal to obtain a brightness signal; the microprocessor is respectively connected with the stroboscopic measurement circuit and the brightness measurement circuit and is used for processing the stroboscopic signal to obtain a stroboscopic value or processing the brightness signal to obtain a brightness value; and the selection switch circuit is connected with the microprocessor and is used for communicating the photoelectric conversion circuit with the stroboscopic measurement circuit or communicating the photoelectric conversion circuit with the brightness measurement circuit according to the selection signal.
Description
Technical Field
The invention belongs to the field of display testing, and particularly relates to a measuring device of a display panel.
Background
At present, when a liquid crystal module displays a picture, a Flicker phenomenon always exists to a certain extent, and when the Flicker phenomenon is serious, the display effect of the liquid crystal module is seriously influenced, and visual fatigue and other discomfort of an observer are caused, so that stroboflash and brightness of each liquid crystal display panel are required to be measured before delivery, relevant parameters are adjusted according to measured values, the stroboflash of the picture is reduced to the minimum value, and the watching effect is improved. The common electrode voltage is the voltage on the common electrode of the liquid crystal display panel and is determined by the characteristics of liquid crystal and the working principle of the liquid crystal module, and in the using process of the liquid crystal display panel, the flicker phenomenon of the liquid crystal display panel can be caused due to the polarity switching of the common electrode voltage, so that the flicker degree of the liquid crystal display panel can be adjusted to be minimum by adjusting the common electrode voltage, and the display effect of the liquid crystal display panel can be best.
Currently, we use a color analyzer (CA-310) to measure the brightness of the liquid crystal display panel and the strobe under a flickering picture. However, the color analyzer cannot be matched with a signal source to realize automatic adjustment of the common electrode voltage of the liquid crystal display panel, so that the stroboflash of a flickering picture is reduced to the minimum. And cannot automatically adjust the gray levels to measure the brightness of each gray level and draw a gamma curve.
Disclosure of Invention
The invention aims to provide a measuring device of a display panel.
According to an aspect of the present invention, there is provided a measuring apparatus of a display panel, including:
the photoelectric lens is used for collecting a first optical signal under a flickering picture or a second optical signal under a gray-scale picture;
the photoelectric conversion circuit is connected with the photoelectric lens and used for converting the first optical signal and the second optical signal into a first electric signal and a second electric signal respectively;
a strobe measurement circuit for processing the first electrical signal to obtain a strobe signal;
the brightness measuring circuit is used for processing the second electric signal to obtain a brightness signal;
the microprocessor is respectively connected with the stroboscopic measurement circuit and the brightness measurement circuit and is used for processing the stroboscopic signal to obtain a stroboscopic value or processing the brightness signal to obtain a brightness value;
and the selection switch circuit is connected with the microprocessor and is used for communicating the photoelectric conversion circuit with the stroboscopic measurement circuit or communicating the photoelectric conversion circuit with the brightness measurement circuit according to a selection signal.
Preferably, the photoelectric conversion circuit further performs amplification processing on the first electric signal and the second electric signal.
Preferably, the photoelectric conversion circuit includes a photodiode, a first operational amplifier, a first capacitor, and a first resistor;
the anode of the photodiode is connected with the second input end of the first operational amplifier and the grounding end, and the cathode of the photodiode is connected with the first input end of the first operational amplifier;
the first capacitor and the first resistor are connected in parallel between the first input terminal and the output terminal of the first operational amplifier.
Preferably, the selection switch circuit includes a first port to a third port, wherein the first port is connected to the photoelectric conversion circuit, the second port is connected to the strobe measurement circuit, and the third port is connected to the brightness measurement circuit;
the selection switch circuit further comprises a selection port connected with the microprocessor and used for communicating the first port with the second port or the first port with the third port according to a selection signal.
Preferably, the microprocessor further provides a first reference voltage and a second reference voltage to the strobe measurement circuit and the brightness measurement circuit, respectively, and provides a control signal to the brightness measurement circuit.
Preferably, the strobe measurement circuit includes:
the first filter circuit is used for filtering a direct current signal in the first electric signal to generate a first alternating current signal;
the first measuring circuit is used for superposing the first alternating current signal and the first reference voltage to generate a stroboscopic signal.
Preferably, the first filter circuit comprises a second capacitor, a second resistor and a fourth resistor,
the second capacitor, the second resistor and the fourth resistor are connected in series between the second port of the selection switch circuit and the ground terminal;
a node between the second resistor and the fourth resistor outputs a first alternating current signal.
Preferably, the first measuring circuit comprises a third capacitor, a fourth capacitor, a third resistor, a fifth resistor, a sixth resistor, a second operational amplifier and a third operational amplifier;
a first input end of the second operational amplifier receives the first alternating current signal, a second input end of the second operational amplifier is connected with the grounding end through a fifth resistor, and an output end of the second operational amplifier is connected with the second input end through a sixth resistor;
the first input end of the third operational amplifier receives the first reference voltage, and the second input end of the third operational amplifier is connected with the output end;
a third resistor is connected between the first input of the second operational amplifier and the output of the third operational amplifier.
Preferably, the strobe measurement circuit includes:
the second filter circuit is used for filtering the alternating current signal in the second electric signal to generate a second direct current signal;
the voltage division circuit is used for generating a voltage division signal according to the second direct current signal;
and the second measuring circuit is used for amplifying the divided voltage signal and generating a brightness signal by superposing the divided voltage signal with the second reference voltage.
Preferably, the second filter circuit comprises a fifth capacitor, the voltage divider circuit comprises a seventh resistor and an eighth resistor, and the second measurement circuit comprises a sixth capacitor, a seventh capacitor, a ninth resistor, a fourth operational amplifier and a fifth operational amplifier;
the fifth capacitor is connected between the third port of the selection switch circuit and the grounding end;
the seventh resistor and the eighth resistor are connected in series between the third port of the selection switch circuit and the ground terminal;
a ninth resistor, which is a variable resistor, connected between the output terminal of the fourth operational amplifier and the output terminal of the fifth operational amplifier;
a first input end of the fourth operational amplifier is connected with a node between the seventh resistor and the eighth resistor, and a second input end of the fourth operational amplifier is connected with a control end of a ninth resistor;
a first input end of the fifth operational amplifier receives a second reference voltage, and a second input end of the fifth operational amplifier is connected with the output end;
the sixth capacitor and the seventh capacitor are connected in parallel between the first input terminal of the fifth operational amplifier and the ground terminal.
Preferably, the signal source is further configured to adjust a strobe of the display panel according to the strobe value and adjust a brightness of the display panel according to the brightness value.
According to the measuring device of the display panel, the stroboscopic signal and the brightness signal of the display panel are acquired through the photoelectric lens, the stroboscopic value and the brightness value are obtained according to the stroboscopic signal and the brightness signal, the stroboscopic of the display panel is adjusted according to the stroboscopic value, the brightness of the display panel is adjusted according to the brightness value, the stroboscopic and the brightness of the display panel can be automatically measured or adjusted, the cost is low, and the size is small.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram illustrating a measurement apparatus of a display panel according to an embodiment of the present invention;
fig. 2 illustrates a circuit diagram of a measuring apparatus of a display panel provided according to an embodiment of the present invention;
fig. 3 is a diagram showing signal waveforms in a strobe measurement circuit provided in accordance with an embodiment of the present invention;
fig. 4 is a diagram showing signal waveforms in the luminance measuring circuit provided according to the embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The present invention may be embodied in various forms, some examples of which are described below.
Fig. 1 is a schematic structural diagram illustrating a measurement apparatus for a display panel according to an embodiment of the present invention. Fig. 2 illustrates a circuit diagram of a measuring apparatus of a display panel provided according to an embodiment of the present invention. As shown in fig. 1, the measuring apparatus of the display panel includes a photoelectric lens 101, a photoelectric conversion circuit 102, a strobe measuring circuit 103, a brightness measuring circuit 104, a microprocessor 105, a selection switch circuit 106, and a signal source 107.
The photoelectric lens 101 is configured to collect a first optical signal in a blinking picture or a second optical signal in a grayscale picture.
In this embodiment, the display panel is driven to display a flicker picture or a gray-scale picture (each gray-scale picture corresponds to a luminance value), and the first optical signal is collected under the flicker picture or the second optical signal is collected under the gray-scale picture.
A photoelectric conversion circuit 102 connected to the photoelectric lens 101 for converting the first optical signal and the second optical signal into a first electrical signal S1 and a second electrical signal L1, respectively.
In the present embodiment, the first electrical signal S1 and the second electrical signal L1 are both superimposed signals of a direct current signal and an alternating current signal.
In a preferred embodiment, the photoelectric conversion circuit 102 further amplifies the first electrical signal S1 and the second electrical signal L1. As shown in fig. 2, the photoelectric conversion circuit 102 includes a photodiode PD, a first operational amplifier U1, a first capacitor C1, and a first resistor R1. The anode of the photodiode PD is connected to the second input terminal of the first operational amplifier U1 and the ground GND, and the cathode is connected to the first input terminal of the first operational amplifier U1; a first capacitor C1 and a first resistor R1 are connected in parallel between the first input terminal and the output terminal of the first operational amplifier U1.
The strobe measurement circuit 103 is configured to process the first electrical signal S1 to obtain a strobe signal S3.
In the embodiment, the strobe measurement circuit 103 filters the dc signal in the first electrical signal S1 to generate a first ac signal S2, and superimposes the first ac signal S2 and the first reference voltage Vref1 to generate a strobe signal S3.
The brightness measuring circuit 104 is configured to process the second electrical signal L1 to obtain a brightness signal L3.
In the embodiment, the luminance measuring circuit 104 filters the ac signal in the second electrical signal L1 to generate a second dc signal L2, divides the second dc signal L2 to generate a divided signal, amplifies the divided signal, and superimposes the divided signal with the second reference voltage Vref2 to generate the luminance signal L3.
The microprocessor 105 is respectively connected to the strobe measurement circuit 103 and the brightness measurement circuit 104, and is configured to process the strobe signal S3 to obtain a strobe value or process the brightness signal L3 to obtain a brightness value.
In this embodiment, the microprocessor 105 further provides a first reference voltage Vref1 and a second reference voltage Vref2 to the strobe measurement circuit 103 and the brightness measurement circuit 104, respectively, and provides a second control signal to the brightness measurement circuit 104. The second control signal is used to control the amplification factor of the divided voltage signal in the luminance measuring circuit 104.
The selection switch circuit 106 is connected to the microprocessor 105, and is configured to communicate the photoelectric conversion circuit 102 with the strobe measurement circuit 103 or communicate the photoelectric conversion circuit 102 with the brightness measurement circuit 104 according to a selection signal.
In this embodiment, the selection switch circuit 106 includes a first port connected to the photoelectric conversion circuit 102, a second port connected to the strobe measurement circuit 103, and a third port connected to the brightness measurement circuit 104.
In a preferred embodiment, the selection switch circuit 106 further includes a selection port connected to the microprocessor 105 for communicating between the first port and the second port or between the first port and the third port according to a selection signal.
The signal source 107 is connected to the microprocessor 105, and is configured to drive the display panel to display a flicker picture or a gray-scale picture according to the first control signal.
In the present embodiment, the microprocessor 105 provides a first control signal to the signal source 107, and the signal source 107 drives the display panel to display a flicker picture or a gray-scale picture according to the first control signal.
In a preferred embodiment, the signal source 107 is further configured to adjust the strobe of the display panel according to the strobe value and adjust the brightness of the display panel according to the brightness value.
Specifically, the signal source 107 drives the display panel to display a strobe image according to the first control signal, and the selection switch circuit 106 connects the photoelectric conversion circuit 102 and the strobe measurement circuit 103 according to the selection signal. The microprocessor 105 receives the strobe signal S3 sent by the strobe measurement circuit 103, converts the strobe signal S3 from the time domain to the frequency domain by fourier transform, and transmits the obtained strobe value to the signal source 107, and the signal source 107 adjusts the strobe of the display panel to be the lowest according to the strobe value.
The signal source 107 switches the display frame of the display panel to a gray-scale frame according to the first control signal, and the selection switch circuit 106 connects the photoelectric conversion circuit 102 and the brightness measurement circuit 104 according to the selection signal. The microprocessor 105 receives the luminance signal L3 sent by the luminance measuring circuit 104, and transmits the acquired luminance value to the signal source 107, and the signal source 107 adjusts the luminance of the display panel according to the luminance value.
In this embodiment, the strobe measurement circuit 103 includes a first filter circuit 1031 and a first measurement circuit 1032, where the first filter circuit 1031 is configured to filter the dc signal in the first electrical signal S1 to generate a first ac signal S2; the first measurement circuit 1032 is used for generating a strobe signal S3 by superimposing the first ac signal S2 and the first reference voltage Vref 1.
Fig. 3 is a diagram showing signal waveforms in a strobe measurement circuit provided according to an embodiment of the present invention. As shown in fig. 3, the first electrical signal S1 includes a direct current signal and an alternating current signal; since the change of the brightness of the stroboscopic picture can cause the change of the dc component in the first electrical signal S1, the dc signal in the first electrical signal S1 is filtered to obtain the first ac signal S2. Half of the first ac signal S2S2 is negative voltage, which cannot be collected by the adc of the microprocessor 105, so that a dc signal (i.e. a first reference voltage) is superimposed on the first ac signal S2 to obtain the strobe signal S3.
Wherein the first filter circuit 1031 includes a second capacitor C2, a second resistor R2, and a fourth resistor R4, and the second capacitor C2, the second resistor R2, and the fourth resistor R4 are connected in series between the second port of the selection switch circuit 106 and the ground GND; a node between the second resistor R2 and the fourth resistor R4 outputs a first alternating current signal S2.
The first measurement circuit 1032 includes a third capacitor C3, a fourth capacitor C4, a third resistor R3, a fifth resistor R5 and a sixth resistor R6, a second operational amplifier U2 and a third operational amplifier U3; the first input end of the second operational amplifier U2 receives the first ac signal S2, the second input end is connected to the ground terminal via the fifth resistor R5, and the output end is connected to the second input end via the sixth resistor R6; a first input end of the third operational amplifier U3 receives a first reference voltage Vref1, and a second input end is connected with the output end; a third resistor R3 is connected between the first input of the second operational amplifier U2 and the output of the third operational amplifier U3.
Fig. 4 is a diagram showing signal waveforms in the luminance measuring circuit provided according to the embodiment of the present invention. As shown in fig. 4, the second electrical signal L1 includes a direct current signal and an alternating current signal; and filtering the alternating current signal in the second electric signal L1 to obtain a second direct current signal L2. The range of the second dc signal L2 may be large when the brightness changes, and may exceed 3.3V so that the microprocessor 105 cannot collect the signal or the voltage is too low so that the measurement result of the microprocessor 105 is inaccurate. Therefore, after the voltage division and amplification, a dc signal (i.e., the second reference voltage) is superimposed to obtain the luminance signal L3. In fig. 4, the second dc signal L is larger and reduced to obtain a luminance signal L3 for the microprocessor 105 to collect.
The brightness measuring circuit 104 includes a second filter circuit 1041, a voltage divider circuit 1042 and a second measuring circuit 1043, wherein the second filter circuit 1041 is configured to filter an ac signal in the second electrical signal L1 to generate a second dc signal L2; the voltage divider circuit 1042 is configured to generate a voltage-divided signal according to the second dc signal L2; the second measurement circuit 1043 is configured to amplify the divided voltage signal and generate a luminance signal L3 by being superimposed with the second reference voltage Vref 2.
The second filter circuit 1041 includes a fifth capacitor C5, the voltage divider circuit 1042 includes a seventh resistor R7 and an eighth resistor R8, and the second measurement circuit 1043 includes a sixth capacitor C6, a seventh capacitor C7, a ninth resistor R9, a fourth operational amplifier U4, and a fifth operational amplifier U5; a fifth capacitor C5 is connected between the third port of the selection switch circuit 106 and ground; a seventh resistor R7 and an eighth resistor R8 are connected in series between the third port of the selection switch circuit 106 and ground; a ninth resistor R9, which is a variable resistor, is connected between the output of the fourth operational amplifier U4 and the output of the fifth operational amplifier U5; a first input end of the fourth operational amplifier U4 is connected with a node between the seventh resistor R7 and the eighth resistor R8, and a second input end is connected with a control end of a ninth resistor R9; a first input end of the fifth operational amplifier U5 receives a second reference voltage Vref2, and a second input end is connected with the output end; a sixth capacitor C6 and a seventh capacitor C7 are connected in parallel between the first input terminal of the fifth operational amplifier U5 and ground.
In the present embodiment, the ninth resistor R9 is a variable resistor, and the position of the control terminal thereof is controlled by the second control signal provided by the microprocessor 105, so as to control the amplification factor of the fourth operational amplifier U4. The amplification formula of the fourth operational amplifier U4 in the second measurement circuit 1043 is:
wherein, Vin4Is the input voltage, V, of the first input terminal of the fourth operational amplifier U4out4The output voltage at the output terminal of the fourth operational amplifier U4 is x/256, which is the voltage division ratio of the ninth resistor R9.
According to the measuring device of the display panel, the stroboscopic signal and the brightness signal of the display panel are acquired through the photoelectric lens, the stroboscopic value and the brightness value are obtained according to the stroboscopic signal and the brightness signal, the stroboscopic of the display panel is adjusted according to the stroboscopic value, the brightness of the display panel is adjusted according to the brightness value, the stroboscopic and the brightness of the display panel can be automatically measured or adjusted, the cost is low, and the size is small.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The scope of the invention should be determined from the following claims.
Claims (9)
1. A measuring apparatus of a display panel, comprising:
the photoelectric lens is used for collecting a first optical signal under a flickering picture or a second optical signal under a gray-scale picture;
the photoelectric conversion circuit is connected with the photoelectric lens and used for converting the first optical signal and the second optical signal into a first electric signal and a second electric signal respectively;
a strobe measurement circuit for processing the first electrical signal to obtain a strobe signal;
the brightness measuring circuit is used for processing the second electric signal to obtain a brightness signal;
the microprocessor is respectively connected with the stroboscopic measurement circuit and the brightness measurement circuit and is used for processing the stroboscopic signal to obtain a stroboscopic value or processing the brightness signal to obtain a brightness value;
the selection switch circuit is connected with the microprocessor and is used for communicating the photoelectric conversion circuit with the stroboscopic measurement circuit or communicating the photoelectric conversion circuit with the brightness measurement circuit according to a selection signal;
the signal source is used for driving the display panel to display a flicker picture or a gray scale picture according to the first control signal;
wherein the strobe measurement circuit comprises:
the first filter circuit is used for filtering a direct current signal in the first electric signal to generate a first alternating current signal;
the first measuring circuit is used for superposing the first alternating current signal and a first reference voltage to generate a stroboscopic signal.
2. The measurement device according to claim 1, wherein the photoelectric conversion circuit further performs amplification processing on the first electric signal and the second electric signal.
3. The measurement device according to claim 2, wherein the photoelectric conversion circuit includes a photodiode, a first operational amplifier, a first capacitor, and a first resistor;
the anode of the photodiode is connected with the second input end of the first operational amplifier and the grounding end, and the cathode of the photodiode is connected with the first input end of the first operational amplifier;
the first capacitor and the first resistor are connected in parallel between the first input terminal and the output terminal of the first operational amplifier.
4. The measurement device according to claim 1, wherein the selection switch circuit comprises a first port to a third port, wherein the first port is connected to the photoelectric conversion circuit, the second port is connected to the strobe measurement circuit, and the third port is connected to the brightness measurement circuit;
the selection switch circuit further comprises a selection port connected with the microprocessor and used for communicating the first port with the second port or the first port with the third port according to a selection signal.
5. The measurement device of claim 4, wherein the microprocessor further provides a first reference voltage and a second reference voltage to the strobe measurement circuit and the brightness measurement circuit, respectively, and a second control signal to the brightness measurement circuit.
6. The measurement device of claim 1, wherein the first filter circuit comprises a second capacitor, a second resistor, and a fourth resistor, and the first measurement circuit comprises a third capacitor, a fourth capacitor, a third resistor, a fifth resistor, and a sixth resistor, a second operational amplifier, and a third operational amplifier;
the second capacitor, the second resistor and the fourth resistor are connected in series between the second port of the selection switch circuit and the ground terminal;
a node between the second resistor and the fourth resistor outputs a first alternating current signal;
a first input end of the second operational amplifier receives the first alternating current signal, a second input end of the second operational amplifier is connected with the grounding end through a fifth resistor, and an output end of the second operational amplifier is connected with the second input end through a sixth resistor;
the first input end of the third operational amplifier receives the first reference voltage, and the second input end of the third operational amplifier is connected with the output end;
a third resistor is connected between the first input of the second operational amplifier and the output of the third operational amplifier.
7. The measurement device of claim 5, wherein the strobe measurement circuit comprises:
the second filter circuit is used for filtering the alternating current signal in the second electric signal to generate a second direct current signal;
the voltage division circuit is used for generating a voltage division signal according to the second direct current signal;
and the second measuring circuit is used for amplifying the divided voltage signal and generating a brightness signal by superposing the divided voltage signal with the second reference voltage.
8. The measurement device of claim 7, wherein the second filtering circuit comprises a fifth capacitor, the voltage divider circuit comprises a seventh resistor and an eighth resistor, and the second measurement circuit comprises a sixth capacitor, a seventh capacitor, a ninth resistor, a fourth operational amplifier, and a fifth operational amplifier;
the fifth capacitor is connected between the third port of the selection switch circuit and the grounding end;
the seventh resistor and the eighth resistor are connected in series between the third port of the selection switch circuit and the ground terminal;
a ninth resistor, which is a variable resistor, connected between the output terminal of the fourth operational amplifier and the output terminal of the fifth operational amplifier;
a first input end of the fourth operational amplifier is connected with a node between the seventh resistor and the eighth resistor, and a second input end of the fourth operational amplifier is connected with a control end of a ninth resistor;
a first input end of the fifth operational amplifier receives a second reference voltage, and a second input end of the fifth operational amplifier is connected with the output end;
the sixth capacitor and the seventh capacitor are connected in parallel between the first input terminal of the fifth operational amplifier and the ground terminal.
9. The measurement device of claim 1, wherein the signal source is further configured to adjust a strobe of the display panel according to the strobe value and adjust a brightness of the display panel according to the brightness value.
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| CN110428761B (en) * | 2019-07-10 | 2022-11-25 | 武汉精立电子技术有限公司 | Method, device and system for non-contact measurement of 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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