CN114512078B - TFT display screen driving voltage detection and adjustment method - Google Patents
TFT display screen driving voltage detection and adjustment method Download PDFInfo
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Abstract
The invention provides a TFT display screen driving voltage detection adjusting method and device, belonging to the technical field of liquid crystal display, and the method comprises the following steps: sensing the illumination intensity data when the display screen flickers; the sensed illumination intensity data of the display screen is converted into sine wave voltage signals; detecting the output voltage signal to obtain an absolute value delta V of the difference between the peak voltage and the trough voltage; judging whether the delta V is within a set threshold range, if so, not adjusting the driving voltage; if not, adjusting the driving voltage through a voltage adjusting register; acquiring the minimum value delta V of delta V in the process of adjusting the driving voltage min And obtaining Δ V min And the corresponding voltage is taken as the optimal driving voltage VCOM, the optimal driving voltage VCOM is burnt into the driving chip, and the adjustment is finished. The method can automatically adjust the driving voltage of the display screen, has high automation degree and low requirement on equipment, and can help enterprises reduce cost and improve efficiency.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a TFT display screen driving voltage detection and adjustment method.
Background
A TFT (Thin Film Transistor), i.e., a Thin Film field effect Transistor, is one of the active matrix liquid crystal displays. The main components of a TFT type liquid crystal display include: fluorescent tubes, light guide plates, polarizing plates, light filters, glass substrates, alignment films, liquid crystal materials, thin-mode transistors, and the like.
After the current TFT screen stays in a certain picture for too long time, the liquid crystal can generate polarization, and when the current TFT screen is switched to the next picture, the shadow of the previous picture can be generated, so that the afterimage phenomenon is generated. In order to reduce such an influence, it is necessary to adjust the driving voltage of the liquid crystal to an equilibrium state. And because the driving voltage of each glass voltage is discrete, the VCOM burning function is introduced to balance the driving voltage. The current mode for burning VCOM is to adjust the value of VCOM by manually observing the flicker degree of a liquid crystal display; the VCOM is also determined by the optical device to grab the screen for flicker, and is re-programmed if there is a deviation from the middle. The manual adjustment has low production efficiency and is easy to make mistakes, and the flicker of the screen grabbed by the optical equipment instrument has high requirement on the equipment and high cost, and is not beneficial to reducing the production cost of enterprises.
Disclosure of Invention
In order to overcome the problems in the related art, an object of the present invention is to provide a method for detecting and adjusting the driving voltage of a TFT display panel, which can automatically adjust the driving voltage of the display panel, has high automation degree and low requirement for equipment, and can help enterprises reduce cost and improve efficiency.
A TFT display screen driving voltage detection and adjustment method comprises the following steps:
sensing illumination intensity data when the display screen flickers;
the sensed illumination intensity data of the display screen is converted into sine wave voltage signals;
acquiring the peak voltage and the trough voltage of the sine wave voltage signal, and acquiring the absolute value delta V of the difference between the peak voltage and the trough voltage;
judging whether the delta V is within a set threshold range, if so, not adjusting the driving voltage, and finishing the adjustment; if not, adjusting the driving voltage of the display screen through a voltage adjusting register;
in the process of adjusting the driving voltage, obtaining the minimum value delta V of the delta V min And obtaining Δ V min And the corresponding voltage is taken as the optimal driving voltage VCOM, the optimal driving voltage VCOM is burnt into the driving chip, and the adjustment is finished.
In a preferred technical solution of the present invention, the converting the sensed data of the illumination intensity of the display screen into a sine wave voltage signal includes:
acquiring illumination intensity data of a display screen by adopting a photodiode, and converting the acquired illumination intensity data into a current signal;
amplifying the converted current signal;
the amplified current signal is output as a sine wave voltage signal through the singlechip.
In a preferred embodiment of the present invention, the amplifying the converted current signal includes amplifying the converted current signal by 10000-50000 times.
In a preferred technical solution of the present invention, the amplification of the converted current signal is accomplished by using an amplifying circuit, which is a differential amplifying circuit.
In a preferred technical solution of the present invention, the obtaining a peak voltage and a trough voltage of the sine wave voltage signal, and obtaining an absolute value Δ V of a difference between the output peak voltage and the output trough voltage includes:
converting the output sine wave voltage signal into a digital signal, and storing the converted digital signal into an array;
reading digital signals of sine wave voltage in a plurality of sine wave periods, and comparing all the digital signals one by one;
acquiring the maximum value and the minimum value of the digital signal;
respectively converting the maximum value and the minimum value of the digital signal into voltage values, wherein the maximum value of the digital signal corresponds to the peak voltage, and the minimum value of the digital signal corresponds to the trough voltage; and (4) making difference between the absolute values of the peak voltage and the trough voltage to obtain delta V.
In a preferred embodiment of the present invention, the reading of the digital signals of the sine wave voltages in a plurality of sine wave periods includes reading voltage signals of at least 5 sine wave periods.
In a preferred embodiment of the present invention, the set threshold range is 40V-90V.
In a preferred embodiment of the present invention, in the process of adjusting the driving voltage, a minimum value Δ V of Δ V is obtained min And obtaining Δ V min The corresponding voltage is used as the optimum driving voltageVCOM, comprising:
in the process of adjusting the driving voltage, the flicker degree of the display screen is changed, and the output sine wave waveform is changed along with the change;
acquiring peak voltage and trough voltage in a plurality of groups of waveforms, and acquiring a plurality of delta V in the plurality of groups of waveforms;
obtaining a minimum value DeltaV of a plurality of DeltaV min Wherein, Δ V min The corresponding driving voltage is the optimal driving voltage VCOM.
In a preferred embodiment of the present invention, in the process of adjusting the driving voltage, a minimum value Δ V of Δ V is obtained min And obtaining Δ V min The corresponding voltage is used as the optimal driving voltage VCOM, and comprises:
in the process of adjusting the driving voltage, the flicker degree of the display screen changes;
adjusting the driving voltage for multiple times, obtaining the minimum value of the flicker brightness data of the display screen in the multiple adjusting processes, and obtaining the corresponding delta V, and recording as delta V min ；
Wherein, is Δ V min The corresponding driving voltage is the optimal driving voltage VCOM.
The second objective of the present invention is to provide a TFT display panel driving voltage detection and adjustment device, which is used to implement the detection and adjustment method.
The invention has the beneficial effects that:
according to the TFT display screen driving voltage detection and adjustment method provided by the invention, the driving voltage of the display screen can be automatically adjusted, and the defects of low efficiency and high possibility of error in manual adjustment of the driving voltage of the display screen are overcome. The method is characterized in that the method comprises the steps of sensing illumination intensity data when a display screen flickers, converting the illumination intensity data into sine wave voltage signals and outputting the sine wave voltage signals, and then identifying the output sine wave voltage signals by utilizing an algorithm, and calculating and judging the sine wave voltage signals. And further judging whether the driving voltage of the display screen needs to be adjusted or not, if so, adjusting the driving voltage to the optimal driving voltage VCOM, and then burning the optimal driving voltage VCOM into the chip. The defect that the screen needs to be grabbed by an optical equipment instrument in the prior art to flicker is overcome, the requirement on the equipment is reduced, the purpose of automatically identifying and adjusting the driving voltage of the display screen is achieved, the production cost of an enterprise can be reduced, and cost reduction and efficiency improvement of the enterprise can be facilitated.
The invention also provides a detection adjusting device for implementing the detection adjusting method, the detection adjusting device automatically identifies and judges the driving voltage of the display screen, and automatically adjusts the driving voltage according to the judgment result, the automation degree is high, the requirement on equipment is low, and the detection adjusting device can help display screen manufacturing enterprises to reduce the production cost.
Drawings
FIG. 1 is a flow chart of a TFT display driving voltage detection and adjustment method provided by the present invention;
FIG. 2 is a flow chart of how the present invention provides for converting a voltage signal and outputting it as a sine wave;
fig. 3 is a flowchart for obtaining the peak voltage, the trough voltage and the absolute value Δ V of the peak voltage and the trough voltage.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that, although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1:
if the uneven distribution of the driving voltage in the display screen directly influences the inconsistent DC bias on the in-plane pixel voltage, the inconsistent DC residual bias forms residual shadow. Therefore, if the driving voltage of the display screen is not adjusted to the optimum value, the display screen stays on one picture for a long time due to the influence of the DC voltage residual bias, and the previous picture stays in the next picture when the pictures are switched, namely, picture ghosting is generated. Therefore, in the process of manufacturing the TFT display screen, manufacturers can test whether the driving voltage is at the optimum value for the flicker picture corresponding to each type of TFT display screen. The existing method for testing the driving voltage generally uses an optical lens, and the lens needs to be developed by a professional equipment manufacturer. And capturing the flicker value of the flicker picture of the display screen through a special optical lens. However, such devices are very expensive and increase the production cost for the display screen manufacturer. For this reason, the present invention provides a method for testing the driving voltage of the display screen without an optical lens to determine whether the current driving voltage value is optimal, and if not, the current driving voltage value is adjusted to be optimal.
As shown in fig. 1-3, a method for detecting and adjusting driving voltage of a TFT display screen includes the following steps:
s100, sensing illumination intensity data when a display screen flickers; the sensing of the light intensity of the display screen can be realized by adopting a photodiode. The photodiode can sense the intensity conversion of illumination and convert the change of illumination into a current signal.
S200, converting the sensed illumination intensity data of the display screen into sine wave voltage signals, and outputting the voltage signals to a processing device;
more specifically, in the process of converting the illumination intensity data into the sine wave voltage signal, the following substeps are also included:
s210, acquiring illumination intensity data of the display screen by adopting a photodiode, and converting the acquired illumination intensity data into a current signal; when the display screen flickers, the more the screen flickers, which indicates that the light changes from a bright state to a dark state more greatly, i.e., the light intensity changes more greatly. The photodiode senses the change in light and converts the change to a current signal.
S220, amplifying the converted current signal; the photodiode is matched with an amplifier, namely an amplifying circuit of an operational amplifier, to amplify the current signal, wherein in practical application, the amplification factor is 10000-50000 times. The current signal is amplified by an amplifying circuit, which is a differential amplifying circuit. The differential amplification circuit has the characteristic of circuit symmetry, and can improve the stability of current signal detection.
And S230, outputting the amplified current signal as a sine wave voltage signal through the singlechip. The amplifying circuit transmits the amplified current signal to a current signal receiving end of the single chip microcomputer, and the single chip microcomputer outputs a sine wave current signal through a pin after receiving the current signal. Theoretically, if the screen flickers more, the larger the voltage difference between the peak and the trough of the sine wave, and if the screen does not flick, the output voltage will be a straight line.
S300, detecting the output voltage signal, acquiring the peak voltage and the trough voltage of the sine wave voltage signal, and acquiring the absolute value delta V of the difference between the peak voltage and the trough voltage;
more specifically, the specific steps of obtaining the peak voltage, the trough voltage and Δ V are as follows:
s310, converting the output sine wave signal of the voltage into a digital signal by using an AD conversion module, and storing the converted digital signal into an array; the acquisition of the peak voltage and the trough voltage of the sine wave voltage is realized by specifically using the MCU to detect the periodic voltage of the sine wave and then finding out the reasonable peak voltage and the trough voltage. MCU includes AD conversion module, and AD conversion module is after converting voltage signal into digital signal, stores digital signal for follow-up comparison.
S320, reading digital signals of sine wave voltage in a plurality of sine wave periods, and comparing all the digital signals one by one; more specifically, voltage signals of 5 sine wave cycles are read. The reading of the multiple sine wave cycles is to ensure the accuracy of obtaining the peak voltage and the trough voltage data. However, the larger the number of sine wave cycles read, the longer it takes. Thus, to balance the accuracy of the data with the efficiency of the system, in a more specific embodiment, 5-7 sine wave cycles of voltage are read.
An algorithm for reading the sine wave period is described, taking the frequency of the sine wave voltage as 20Hz as an example:
since the frequency of the sine wave is 20Hz, one sine wave cycle is 50ms, and the voltage is read once every ms, one dot unit, for 5 sine cycles, which are read, is 250 ms. The MCU needs to read 250 times in a loop, that is, the voltage value of each point in 5 sine wave cycles is read once in all, so as to ensure the accuracy of the subsequent data comparison.
S330, acquiring the maximum value and the minimum value of the digital signal; each digital signal corresponds to a voltage value, and how to convert the digital signal and the voltage value into each other is realized by adopting an AD conversion module. The AD conversion module is an analog-to-digital converter, which is a prior art, and therefore, the working principle thereof is not described in detail.
S340, respectively converting the maximum value and the minimum value of the digital signal into voltage values, wherein the maximum value of the digital signal corresponds to a peak voltage and the minimum value of the digital signal corresponds to a trough voltage; and (4) making difference between the absolute values of the peak voltage and the trough voltage to obtain delta V.
S400, judging whether the delta V is in a set threshold range, wherein the threshold range is 40V-90V. If so, the driving voltage does not need to be adjusted, and the adjustment is finished; if not, the driving voltage is adjusted through the voltage adjusting register. The driving voltage value of the TFT display is stored in a register, and the VCOM value can be changed by changing the register value. The optimum driving voltage VCOM of the TTF display screen is theoretically half of the sum of the absolute values of the peak voltage and the valley voltage. However, due to the limitation of the device, there is a certain difference between the actual optimal driving voltage and the theoretical optimal driving voltage, so that a threshold value of the difference needs to be set to provide a data reference for adjusting the driving voltage of the display screen. The set threshold range is related to the device and also to the specification of the display screen.
S500, in the process of adjusting the driving voltage, obtaining the minimum value delta V of the delta V min And obtaining Δ V min And the corresponding voltage is taken as the optimal driving voltage VCOM, the optimal driving voltage VCOM is burned into the driving chip, and the adjustment is finished.
The principle of the scheme is that the photodiode is used for sensing the flicker of the TFT display screen, the more the screen flicker is, the stronger the current signal sensed and converted by the photodiode is, and the larger the difference value between the wave crest and the wave trough of the waveform voltage of the converted sine wave is. And the current signal can be amplified through the signal amplifier again, so that the tiny current signal can be rapidly and accurately read, and the accuracy of signal reading is ensured. And secondly, identifying and judging the sine wave voltage through algorithm processing, and achieving the purposes of automatically detecting and identifying the driving voltage of the TFT display screen. And the drive voltage is regulated by controlling the voltage regulation register, so that closed-loop control of detection, identification and regulation is realized.
According to the TFT display screen driving voltage detection and adjustment method, the driving voltage of the display screen can be automatically adjusted, and the defects that the efficiency is low and errors are prone to occurring when the driving voltage of the display screen is manually adjusted are overcome. The method is characterized in that the method comprises the steps of sensing illumination intensity data when a display screen flickers, converting the illumination intensity data into sine wave voltage signals and outputting the sine wave voltage signals, and then identifying the output sine wave voltage signals by utilizing an algorithm, and calculating and judging the sine wave voltage signals. And further judging whether the driving voltage of the display screen needs to be adjusted or not, if so, adjusting the driving voltage to the optimal driving voltage VCOM, and then burning the optimal driving voltage VCOM into the chip. The defect that the screen needs to be grabbed by an optical equipment instrument in the prior art to flicker is overcome, the requirement on the equipment is reduced, the purpose of automatically identifying and adjusting the driving voltage of the display screen is achieved, the production cost of an enterprise can be reduced, and cost reduction and efficiency improvement of the enterprise can be facilitated.
In a more specific embodiment, during the adjustment of the driving voltage, a minimum value Δ V of Δ V is obtained min And obtaining Δ V min The corresponding voltage is used as the optimal driving voltage VCOM, and includes:
in the process of adjusting the driving voltage, the flicker degree of the display screen is changed, and the output sine wave waveform is changed along with the change;
acquiring peak voltage and trough voltage in a plurality of groups of waveforms, and acquiring a plurality of delta V in the plurality of groups of waveforms;
obtaining a minimum value DeltaV of a plurality of DeltaV min Wherein, Δ V min The corresponding driving voltage is the optimal driving voltage VCOM.
In this embodiment, the difference Δ V between the absolute values of the peak wave light voltages is directly obtained, and a plurality of Δ are obtained. Minimum value Δ V of V min And the corresponding voltage, which is the optimum driving voltage VCOM. Obtaining a plurality of deltaV and deltaV min In order to ensure the accuracy of the data.
The invention also provides a TFT display screen driving voltage detection and adjustment device, which is used for implementing the detection and adjustment method.
The detection adjusting device can automatically identify and judge the driving voltage of the display screen, automatically adjust the driving voltage according to the judgment result, has high automation degree and low requirement on equipment, and can help display screen manufacturing enterprises to reduce the production cost.
Example 2:
this embodiment will be described only for differences from embodiment 1, and the remaining technical features are the same as those of the above-described embodiment.
In this embodiment, in the process of adjusting the driving voltage, a minimum value Δ V of Δ V is obtained min And obtaining Δ V min The corresponding voltage is used as the optimal driving voltage VCOM, and comprises:
in the process of adjusting the driving voltage, the flicker degree of the display screen changes;
adjusting the driving voltage for multiple times, obtaining the minimum value of the flicker brightness data of the display screen in the multiple adjusting processes, and obtaining the corresponding delta V, and recording as delta V min (ii) a The minimum value of the flicker brightness data of the display screen is obtained, the brightness of the display screen can be judged by manually judging the brightness, and the brightness of the display screen can also be judged by means of a brightness detector.
Wherein, is Δ V min The corresponding driving voltage is the optimal driving voltage VCOM.
The embodiment obtains the delta V according to the brightness of the flicker of the display screen min And further obtain Δ V min The corresponding voltage is used as the optimum driving voltage VCOM. Unlike example 1, this method does not perform judgment by comparing a plurality of Δ V, but obtains the result by flashing the luminance data on the display screen. The benefit of this approach is more intuitive, but is subjective, leading to a greater probability of error than the approach provided in example 1. The method has the advantages of reducing the dependence on the system and reducing the cost of the system.
The aspects of the present application have been described in detail hereinabove with reference to the accompanying drawings. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. Those skilled in the art should also appreciate that the acts and modules referred to in the specification are not necessarily required in the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application may be sequentially adjusted, combined, and deleted according to actual needs, and the modules in the device of the embodiment of the present application may be combined, divided, and deleted according to actual needs.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems and methods according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (2)
1. A TFT display screen driving voltage detection and adjustment method is realized based on a TFT display screen driving voltage detection and adjustment device, and is characterized in that: the display screen driving voltage detection and adjustment device comprises a photodiode for sensing the intensity of illumination and converting, an MCU processor, a controller and a voltage regulation register, wherein the MCU processor comprises an AD conversion module, the AD conversion module converts a voltage signal into a digital signal, the MCU processor is electrically connected with the MCU processor, the controller is electrically connected with the MCU processor and the voltage regulation register, and the TFT display screen driving voltage detection and adjustment method comprises the following steps:
sensing the illumination intensity data when the display screen flickers;
the sensed illumination intensity data of the display screen is converted into sine wave voltage signals;
the specific process of converting the illumination intensity data into the sine wave voltage signal is as follows: acquiring illumination intensity data of a display screen by adopting a photodiode, and converting the acquired illumination intensity data into a current signal; amplifying the converted current signal by 10000-50000 times; outputting the amplified current signal as a sine wave voltage signal through a singlechip;
acquiring the peak voltage and the trough voltage of the sine wave voltage signal, and acquiring the absolute value delta V of the difference between the peak voltage and the trough voltage;
the process of the absolute value Δ V includes: the method comprises the steps of obtaining and converting an output sine wave voltage signal into a digital signal, and storing the converted digital signal into an array; reading digital signals of at least 5 sine wave periods of sine wave voltage, and comparing all the digital signals one by one; acquiring the maximum value and the minimum value of the digital signal; respectively converting the maximum value and the minimum value of the digital signal into voltage values, wherein the maximum value of the digital signal corresponds to the peak voltage and the minimum value of the digital signal corresponds to the trough voltage; making difference between the absolute values of the peak voltage and the trough voltage to obtain delta V;
judging whether the delta V is within a set threshold range, if so, not adjusting the driving voltage, and ending the adjustment; if not, adjusting the driving voltage of the display screen through a voltage adjusting register; the set threshold range is 40V-90V;
acquiring the minimum value delta V of delta V in the process of adjusting the driving voltage min And obtaining Δ V min The corresponding voltage is taken as the optimal driving voltage VCOM, the optimal driving voltage VCOM is burnt into the driving chip, and the adjustment is finished;
the sum is obtained as min The VCOM process using the corresponding voltage as the optimal driving voltage is as follows:
in the process of adjusting the driving voltage, the flicker degree of the display screen is changed, and the output sine wave waveform is changed along with the change;
acquiring peak voltage and trough voltage in the multiple groups of waveforms, and acquiring a plurality of deltaV in the multiple groups of waveforms;
obtaining a minimum value DeltaV of a plurality of DeltaV min Wherein, Δ V min The corresponding driving voltage is the optimal driving voltage VCOM.
2. The method for detecting and adjusting the driving voltage of the TFT display screen according to claim 1, wherein the method comprises the following steps:
and amplifying the converted current signal by adopting an amplifying circuit, wherein the amplifying circuit is a differential amplifying circuit.
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| CN104361873A (en) * | 2014-11-18 | 2015-02-18 | 深圳市华星光电技术有限公司 | Method and device for adjusting display parameters and liquid crystal display system |
| CN205230558U (en) * | 2015-12-14 | 2016-05-11 | 昆山龙腾光电有限公司 | Detection apparatus |
| CN108182922A (en) * | 2018-01-09 | 2018-06-19 | 昆山龙腾光电有限公司 | Common voltage regulating device, adjusting method and liquid crystal display device |
| CN109656037A (en) * | 2019-01-02 | 2019-04-19 | 海的电子科技(苏州)有限公司 | The measurement method of display screen flicker degree based on photodiode |
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| CN1848227A (en) * | 2005-04-13 | 2006-10-18 | 株式会社日立制作所 | Image display device |
| JP2007240627A (en) * | 2006-03-06 | 2007-09-20 | Fuji Mach Mfg Co Ltd | Adjustment device for liquid crystal display device |
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| CN104361873A (en) * | 2014-11-18 | 2015-02-18 | 深圳市华星光电技术有限公司 | Method and device for adjusting display parameters and liquid crystal display system |
| CN205230558U (en) * | 2015-12-14 | 2016-05-11 | 昆山龙腾光电有限公司 | Detection apparatus |
| CN108182922A (en) * | 2018-01-09 | 2018-06-19 | 昆山龙腾光电有限公司 | Common voltage regulating device, adjusting method and liquid crystal display device |
| CN109656037A (en) * | 2019-01-02 | 2019-04-19 | 海的电子科技(苏州)有限公司 | The measurement method of display screen flicker degree based on photodiode |
| CN110599935A (en) * | 2019-08-26 | 2019-12-20 | 昆山龙腾光电有限公司 | Automatic adjusting device and automatic adjusting method for public voltage |
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