CN115113421B - Quantitative evaluation system for local backlight response delay - Google Patents
Quantitative evaluation system for local backlight response delay Download PDFInfo
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- CN115113421B CN115113421B CN202110309014.1A CN202110309014A CN115113421B CN 115113421 B CN115113421 B CN 115113421B CN 202110309014 A CN202110309014 A CN 202110309014A CN 115113421 B CN115113421 B CN 115113421B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The application discloses a quantitative evaluation system of local backlight response delay, which comprises: the device comprises a test control terminal, an oscilloscope and a photosensitive sensor, wherein the oscilloscope is connected with the test control terminal and the photosensitive sensor; the test control terminal is connected with the display equipment to be tested and is used for controlling the display state of the display equipment to be tested so as to simulate and form a corresponding display test environment; an oscilloscope for displaying an electric signal time sequence diagram corresponding to the display equipment to be tested in the current display test environment; the corresponding brightness signal time sequence diagram corresponding to the brightness information acquired by the photosensitive sensor is also displayed; and the test control terminal is used for determining response delay information of the local backlight in the display equipment to be tested according to the signal timing diagrams received under each display test environment. By utilizing the system, high accuracy of response delay measurement is ensured; the effect of high reproducibility of the measurement result is achieved; the quick positioning of the response delay problem is realized.
Description
Technical Field
The application relates to the technical field of liquid crystal display, in particular to a quantitative evaluation system for local backlight response delay.
Background
At present, a Local backlight (Local Dimming) brightness control function is often designed in display screen related equipment. For display devices with local backlight, the switching timing and brightness control of the light emitting diodes (Light Emitting Diode, LEDs) of the local backlight are required to change in real time following the display screen content changes when in operation. That is, the local backlight needs to be closely synchronized with the display of the display screen to avoid response delay when the display content changes.
Therefore, in order to avoid the influence of the response delay of the local backlight on the display effect of the display screen, the corresponding response delay evaluation is generally performed on the local backlight function of the display device before leaving the factory. The existing evaluation mode is that white light spots of mobile display are set under the black screen background of a display screen, and then whether response delay exists between the display of the local backlight and the display screen is determined by manually judging whether delay display exists in the original area after the white light spots move. Fig. 1 shows a conventional evaluation schematic diagram of a local backlight response delay, as shown in fig. 1, the background of a display screen 1 is a black screen, and a movable white light spot 11 is presented, after the white light spot moves, a delayed display on brightness of an original area 12 where the white light spot is located can be obviously seen, and thus, the response delay of the local backlight is determined.
However, the existing evaluation methods have the following problems: 1) The whole evaluation result is artificially and subjectively judged, and the response delay cannot be specifically quantified; 2) Judging that the result is different from person to person, and the reproducibility of the data and the result is very low; 3) The delay caused by which part of the design cannot be identified from the judgment result, and the problem of quick positioning cannot be solved.
Disclosure of Invention
In view of the above, the embodiment of the application provides a quantitative evaluation system for response delay of local backlight, which realizes quantitative evaluation of response delay of local backlight in display equipment.
In a first aspect, an embodiment of the present application provides a system for quantitatively evaluating local backlight response delay, including: the device comprises a test control terminal, an oscilloscope and a photosensitive sensor, wherein the oscilloscope is connected with the test control terminal and the photosensitive sensor;
the test control terminal is connected with the display equipment to be tested and is used for simulating and forming a corresponding display test environment by controlling the display state of the display equipment to be tested;
the oscilloscope is connected with a target end in the display equipment to be tested through a target probe matched with the current display test environment and is used for displaying an electric signal time sequence diagram corresponding to the display equipment to be tested under the current display test environment;
The photosensitive sensor is used for collecting brightness information of the display equipment to be tested in the current display test environment and transmitting the brightness information to the oscilloscope to display a corresponding brightness signal time sequence chart;
the test control terminal is used for determining response delay information of the local backlight in the display equipment to be tested according to the received electric signal time sequence diagram and/or the received brightness signal time sequence diagram in each display test environment, wherein the response delay information comprises response delay reasons and response delay time.
Further, the test control terminal includes:
the time sequence information determining module is used for receiving an electric signal time sequence diagram and/or a brightness signal time sequence diagram displayed by the oscilloscope in the current display test environment and determining time sequence difference information in the current display test environment;
and the response delay determining module is used for determining response delay information when the local backlight in the display equipment to be tested changes relative to the picture content of the display screen according to the time sequence difference information under each display test environment.
Further, the test control terminal also comprises an environment simulation control module,
the environment simulation control module is specifically configured to:
the display equipment to be tested is controlled to close a local backlight function and keep the backlight module in a normally-on state, then the picture content displayed in a set area on the display screen is controlled to be changed from black to white, and then the picture content is changed from white to black, so that a simulated first test environment is formed; or alternatively, the process may be performed,
The display equipment to be tested is controlled to close a local backlight function, picture content in a set area on the display screen is controlled to continuously display white, and a backlight constant current driving plate is controlled to turn from close backlight to open backlight and then from open backlight to close backlight, so that a simulated second test environment is formed; or alternatively, the process may be performed,
and controlling the display equipment to be tested to turn on a local backlight function, and controlling the picture content displayed in a set area on the display screen to be changed from black to white and then from white to black, so as to form a simulated third test environment.
Further, when the current display test environment is the first test environment,
the oscilloscope is in contact connection with the output end of the flip-chip thin film driving chip on the display equipment to be tested through a voltage probe matched with the first test environment and is used for displaying a first voltage signal time sequence diagram corresponding to the measured liquid crystal driving voltage in the first test environment;
the photosensitive sensor is used for collecting the picture brightness information of the display screen of the display device to be tested in the first test environment and transmitting the picture brightness information to the oscilloscope to display a corresponding picture brightness signal time sequence chart.
Further, the timing information determining module is specifically configured to:
receiving a first voltage signal time sequence diagram and a picture brightness signal time sequence diagram displayed by the oscilloscope in the first test environment;
recording a first voltage rising edge time point and a first voltage falling edge time point in the first voltage signal time sequence diagram, and a first brightness rising edge time point and a first brightness falling edge time point in the picture brightness signal time sequence diagram;
determining a first rising time sequence difference and a first falling time sequence difference as time sequence difference information in the first test environment;
the first rising time sequence difference is a difference value between the first brightness rising time point and a first voltage rising time point;
the first falling time sequence difference is a difference value between the first brightness falling edge time point and the first voltage falling edge time point.
Further, when the current display test environment is the second test environment,
the oscilloscope is connected with the output end of the backlight constant current driving plate on the display equipment to be tested through a current probe matched with the second test environment and is used for displaying a first current signal time sequence diagram corresponding to the measured backlight driving current in the second test environment;
And the photosensitive sensor is used for collecting backlight brightness information of the display screen of the display device to be tested in the second test environment and transmitting the backlight brightness information to the oscilloscope to display a corresponding backlight brightness signal time sequence chart.
Further, the timing information determining module is specifically configured to:
receiving a first current signal time sequence diagram and a backlight brightness signal time sequence diagram displayed by the oscilloscope in the second test environment;
recording a first current rising edge time point and a first current falling edge time point in the first current signal time sequence diagram, and a second brightness rising edge time point and a second brightness falling edge time point in the picture brightness signal time sequence diagram;
determining a second rising time sequence difference and a second falling time sequence difference as time sequence difference information under the second test environment;
the second rising time sequence difference is a difference value between the second brightness rising edge time point and the first current rising edge time point;
the second falling time sequence difference is a difference value between the second brightness falling edge time point and the first current falling edge time point.
Further, when the current display test environment is the third test environment,
the oscilloscope is in contact connection with the output end of the flip-chip thin film driving chip on the display equipment to be tested through a voltage probe matched with the third test environment and is used for displaying a second voltage signal time sequence diagram corresponding to the measured liquid crystal driving voltage in the third test environment;
The oscilloscope is also connected with the output end of the backlight constant current driving plate on the display device to be tested through a current probe matched with the third test environment and is used for displaying a second current signal time sequence diagram corresponding to the measured backlight driving current under the third test environment.
Further, the timing information determining module is specifically configured to:
receiving a second voltage signal time sequence chart and a second current signal time sequence chart which are displayed by the oscilloscope in the third test environment;
recording a second voltage rising edge time point and a second voltage falling edge time point in the second voltage signal time sequence diagram, and a second current rising edge time point and a second current falling edge time point in the second current signal time sequence diagram;
determining a third rising time sequence difference and a third falling time sequence difference as time sequence difference information under the third test environment;
the third rising time sequence difference is a difference value between the second current rising edge time point and a second voltage rising edge time point;
the third falling time sequence difference is the difference between the second current falling edge time point and the second voltage falling edge time point.
Further, the response delay determining module includes:
The information acquisition unit is used for acquiring a first rising time sequence difference and a first falling time sequence difference in the time sequence difference information corresponding to the first test environment, a second rising time sequence difference and a second falling time sequence difference in the time sequence difference information corresponding to the second test environment, and a third rising time sequence difference and a third falling time sequence difference in the time sequence difference information corresponding to the third test environment;
the first response delay determining unit is used for determining first response delay information of the local backlight in the display device to be tested when the picture content of the display screen is from black to white according to the first rising time sequence difference, the second rising time sequence difference and the third rising time sequence difference;
and the second response delay determining unit is used for determining second response delay information of the local backlight in the display device to be tested when the picture content of the display screen is changed from white to black according to the first descending time sequence difference, the second descending time sequence difference and the third descending time sequence difference.
Further, the first response delay determining unit is specifically configured to:
if the third rising time sequence difference is smaller than 0, determining that the power supply time of the display screen panel is longer than the power supply time of the backlight module as a first response delay reason, and inputting the first rising time sequence difference, the second rising time sequence difference and the third rising time sequence difference into a given delay calculation formula to obtain a first response delay time of the local backlight in the display screen picture content of the display equipment to be tested from black to white; otherwise the first set of parameters is selected,
Determining that the power supply time of the display screen panel is later than that of the backlight module as a first response delay reason, and obtaining a first response delay of local backlight in the display screen picture content of the display equipment to be tested from white to black according to a delay calculation formula determined by a comparison result of the third rising time sequence difference and the second rising time sequence difference;
the first response delay cause and the first response delay time are recorded as first response delay information.
Further, the second response delay determining unit is specifically configured to:
if the third descending time sequence difference is smaller than 0, determining that the power supply time of the display screen panel is longer than the power supply time of the backlight module as a second response delay reason, and inputting the first descending time sequence difference, the second descending time sequence difference and the third descending time sequence difference into a given delay calculation formula to obtain a second response delay time of the local backlight in the display screen picture content of the display equipment to be detected from black to white; otherwise the first set of parameters is selected,
determining that the power supply time of the display screen panel is later than the power supply time of the backlight module as a first response delay reason, and obtaining a second response delay time of the local backlight in the display screen picture content of the display equipment to be tested from white to black according to a delay calculation formula determined by a comparison result of the third descending time sequence difference and the second descending time sequence difference;
And recording the second response delay reason and the second response delay time as second response delay information.
The quantitative evaluation system for the local backlight response delay comprises a test control terminal, an oscilloscope and a photosensitive sensor, wherein the oscilloscope is connected with the test control terminal and the photosensitive sensor; the test control terminal is connected with the display equipment to be tested and is used for controlling the display state of the display equipment to be tested so as to simulate and form a corresponding display test environment; the oscilloscope is connected with a target end in the display equipment to be tested through a target probe matched with the current display test environment and is used for displaying an electric signal time sequence diagram corresponding to the display equipment to be tested under the current display test environment; the photosensitive sensor is used for collecting brightness information of the display equipment to be tested in the current display test environment and transmitting the brightness information to the oscilloscope to display a corresponding brightness signal time sequence chart; the test control terminal is used for determining response delay information of the local backlight in the display equipment to be tested according to the received electric signal time sequence diagram and/or the received brightness signal time sequence diagram under each display test environment. According to the technical scheme, accurate measurement and objective judgment of local backlight response delay in the display equipment are realized, and high accuracy of response delay measurement is ensured; in addition, the scheme of the embodiment ensures that the evaluation result is not different from person to person, and achieves the effect of high reproducibility of the measurement result; and the problem of response delay can be rapidly positioned while the measurement result is dataized, so that the effective improvement of the local backlight design by technicians is facilitated.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 shows a prior art evaluation of local backlight response delay;
FIG. 2 is a block diagram of a system for quantitatively evaluating local backlight response delay according to an embodiment of the present application;
FIG. 3 is a diagram showing an example of controlling the change of the screen content of a display device to be tested;
FIG. 4 is a diagram showing two signal timing diagrams of an oscilloscope in the system according to the present embodiment under a first test environment;
FIG. 5 is a diagram showing two signal timing diagrams of an oscilloscope in the system according to the embodiment under a second test environment
Fig. 6 is a diagram showing two signal timing diagrams of the oscilloscope in the system according to the present embodiment under the third test environment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the following detailed description of the embodiments of the present application will be given with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application as detailed in the accompanying claims.
In the description of the present application, it should be understood that the terms "first," "second," "third," and the like are used merely to distinguish between similar objects and are not necessarily used to describe a particular order or sequence, nor should they be construed to indicate or imply relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, in the description of the present application, unless otherwise indicated, "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
Fig. 2 is a block diagram of a system for quantitatively evaluating response delay of a local backlight according to an embodiment of the present application, where the system is suitable for evaluating response delay of a local backlight in a display device. As shown in fig. 2, the system 2 includes: the device comprises a test control terminal 20, an oscilloscope 21 and a photosensitive sensor 22, wherein the oscilloscope 21 is connected with the test control terminal 20 and the photosensitive sensor 22;
the test control terminal 20 is connected with the display device 100 to be tested and is used for controlling the display state of the display device 100 to be tested so as to simulate and form a corresponding display test environment;
the oscilloscope 21 is connected with a target end in the display equipment 100 to be tested through a target probe matched with the current display test environment and is used for displaying an electric signal time sequence diagram corresponding to the display equipment 100 to be tested under the current display test environment;
the photosensitive sensor 22 is used for collecting brightness information of the display device 100 to be tested in the current display test environment and transmitting the brightness information to the oscilloscope 21 to display a corresponding brightness signal timing diagram;
a test control terminal 20 for determining response delay information of the local backlight in the display device 100 to be tested according to the received electrical signal timing chart and/or brightness signal timing chart under each display test environment; the response delay information comprises a response delay reason and response delay time.
In this embodiment, in order to realize the quantitative evaluation of response delay, a photosensitive sensor 22 for optical signal acquisition and an oscilloscope 21 for signal timing diagram display are added before the local backlight test is performed on the display device 100 to be tested, and a test control terminal 20 required for quantitative calculation is also added.
Specifically, after the test control terminal 20 is connected to the display device 100 to be tested, the change of the content of the picture displayed by the display device 100 to be tested can be controlled, for example, the content of the picture is changed from black to white or from white to black; it is also possible to control the turning on or off of certain functions related to display on the display device under test 100, such as controlling the local backlight function to be turned on or off, so as to construct a display test environment required for the local backlight response delay evaluation.
The oscilloscope 21 is provided with probes required for connecting the device, such as a voltage probe, a current probe, etc., different probes can be connected with different inputs or outputs of the device or equipment, such as the voltage probe can be connected with the voltage output of the electric device, and the current probe can be connected with the current output of the electric device. When the test control terminal 20 controls the display device 100 to be tested to be in a certain display test environment, the display test environment may be recorded as a current display test environment, a tester may select a probe matched with the current display test environment as a target probe, and a target end connected with the target probe may be determined from the display device 100 to be tested. Thus, the oscilloscope 21 can obtain the electrical signal information output by the target terminal through the connection between the target probe selected by the tester and the target terminal on the display device 100 to be tested, and can form a corresponding electrical signal timing chart based on the electrical signal information.
The photosensor 22 corresponds to an optical signal acquisition device, and the tester only needs to approach the photosensor 22 to the display screen of the display device 100 to be tested and keep the photosensor 22 within a close range, so that the photosensor 22 can acquire the brightness information of the display screen in real time. Meanwhile, the photosensor 22 is connected to the oscilloscope 21, whereby the acquired luminance information can be fed back to the oscilloscope 21 and displayed by the oscilloscope 21 in the form of a luminance signal timing chart.
The test control terminal 20 is connected with the oscilloscope 21, and can acquire a signal timing diagram (an electrical signal timing diagram and/or a brightness signal timing diagram) presented by the oscilloscope 21 in any display test environment, then the test control terminal 20 can analyze each received signal timing diagram under the same time reference, so as to acquire signal timing difference information among the signal timing diagrams in different display test environments, and finally, according to the corresponding signal timing difference information in each display test environment, the response delay cause of the local backlight function in the display device 100 to be tested when the display picture changes can be determined, and meanwhile, the response delay time when the response delay exists can be determined by combining the matched delay calculation formula.
The quantitative evaluation system for the local backlight response delay provided by the embodiment of the application realizes the accurate measurement and objective judgment of the local backlight response delay in the display equipment, and ensures the high accuracy of the response delay measurement; in addition, the scheme of the embodiment ensures that the evaluation result is not different from person to person, and achieves the effect of high reproducibility of the measurement result; and the problem of response delay can be rapidly positioned while the measurement result is dataized, so that the effective improvement of the local backlight design by technicians is facilitated.
Further, the test control terminal 20 includes:
the timing information determining module 202 is configured to receive a timing diagram of an electrical signal and/or a timing diagram of a luminance signal displayed by the oscilloscope 21 in a current display test environment, and determine timing difference information in the current display test environment;
the response delay determining module 201 is configured to determine response delay information when the local backlight in the display device 100 to be tested changes relative to the screen content of the display screen according to the time sequence difference information under each display test environment.
In the present embodiment, the test control terminal 20 can realize determination of local backlight response delay information by the included timing information determination module 202 and response delay determination module 201. Specifically, the timing information determining module 202 may receive the electrical signal timing diagrams and/or the luminance signal timing diagrams respectively displayed by the oscilloscope 21 under different display test environments, and determine timing difference information corresponding to the display test environments.
In this embodiment, when the test control terminal 20 simulates different display test environments by controlling the display states of the display device 100 to be tested, the oscilloscope 21 can measure the driving voltage of the liquid crystal display through the voltage probe under the different display test environments, so as to display the driving voltage signal timing chart of the driving voltage of the liquid crystal display in the display device 100 to be tested, and/or measure the driving current of the backlight module through the current probe, so as to display the driving voltage signal timing chart of the driving voltage of the liquid crystal display in the display device 100 to be tested.
In addition, the oscilloscope 21 can also perform presentation of a picture brightness signal timing chart according to a picture brightness signal acquired by the photosensitive sensor 22 when the display screen displays picture content, or perform presentation of a backlight brightness current signal timing chart according to a backlight brightness signal acquired by the photosensitive sensor 22 when the display screen is in a backlight mode.
It should be noted that, in any display test environment, the oscilloscope 21 may present two signal timing diagrams, where the two signal timing diagrams may be two electrical signal timing diagrams (e.g., one voltage signal timing diagram and one current signal timing diagram), or may be one electrical signal timing diagram (including two cases, i.e., the timing diagrams corresponding to the voltage signal and the current signal), and one luminance signal timing diagram (including two cases, i.e., the timing diagrams corresponding to the backlight luminance signal and the picture luminance signal). In any display test environment, the timing information determining module 202 may find rising edge time points in the two signal timing diagrams and perform time difference calculation based on the two signal timing diagrams presented by the oscilloscope 21 to form rising timing differences between the two signal timing diagrams, and find falling edge time points and perform time difference calculation to form falling timing differences between the two signal timing diagrams.
In this embodiment, the response delay determining module 201 may determine, according to the rising time sequence difference and the falling time sequence difference determined by the time information determining module in each display test environment, and in combination with the comparison result of the time sequence differences in different display test environments, response delay information corresponding to each local backlight in the display device 100 to be tested when the picture content changes in different forms (for example, the picture content changes from black to white or from white to black).
Further, the test control terminal 20 also includes an environmental simulation control module 203,
the environment simulation control module 203 is specifically configured to:
the method comprises the steps of controlling the display device 100 to be tested to turn off a local backlight function and keep a normally-on state of a backlight module, and then controlling the picture content displayed in a set area on a display screen to be changed from black to white and then from white to black to form a simulated first test environment; or alternatively, the process may be performed,
controlling the display device 100 to be tested to turn off a local backlight function, controlling the picture content in a set area on the display screen to continuously display white, and controlling the backlight constant current driving plate to turn off the backlight into turn on the backlight, and then turning on the backlight into turn off the backlight to form a simulated second test environment; or alternatively, the process may be performed,
And controlling the display device 100 to be tested to turn on the local backlight function, and controlling the picture content presented in the set area on the display screen to be changed from black to white and then from white to black, so as to form a simulated third test environment.
In this embodiment, three display test environments are preferably provided, which are simulated by the control of the test control terminal 20, wherein the first test environment mainly shows a situation that the local backlight function is not turned on, and when the backlight module is kept constant, the screen content in the set screen display area on the display screen is controlled to change from black to white and from white to black. The second test environment mainly shows the situation that the backlight module is controlled to change from light to dark when the local backlight function is not started and the picture content in the picture display area set on the display screen is kept unchanged. The third test environment mainly shows that on the premise of starting the local backlight function, the picture content in the picture display area set on the display screen is controlled to change from black to white and from white to black.
To facilitate a better understanding of the control process of the test control terminal 20 in simulating the display test environment, fig. 3 is a diagram showing an example of the change in screen content of the display device 100 to be tested. As shown in fig. 3, when the content of the screen to be controlled is required to be changed in the display test scene (e.g., the first test environment and the third test environment), the test control terminal 20 will control the setting display area 32 in the display interface 31 to change the content of the screen in the order from a to B and then from B to C. In the second test environment, the test control terminal 20 corresponds to controlling the set display area 32 in the display interface 31 to remain in the display state of B, that is, the set display area 32 appears white.
Further, when the current display test environment is the first test environment,
the oscilloscope 21 is in contact connection with an output terminal of the flip chip film driving chip on the display device 100 to be tested through a voltage probe matched with the first test environment, and is used for displaying a first voltage signal timing diagram corresponding to the measured liquid crystal driving voltage in the first test environment;
the photosensitive sensor 22 is configured to collect the frame brightness information of the display screen of the display device 100 to be tested in the first test environment, and transmit the frame brightness information to the oscilloscope 21 to display a corresponding frame brightness signal timing chart.
The present embodiment preferably gives a presentation of information of the oscilloscope 21 and the photosensor 22 when the current display test environment is the first test environment. The oscilloscope 21 uses a voltage probe as a target probe, and performs point contact connection with an output end on the flip-chip thin film driving chip, where the output end can be regarded as a target end. In the process that the test control terminal 20 controls the display device 100 to be tested to be presented in the first test environment, the oscilloscope 21 measures the voltage value of the liquid crystal drive and displays a corresponding first voltage signal timing chart.
The photosensitive sensor 22 can also collect the brightness information of the picture content in real time after approaching to the display screen of the display device 100 to be measured, and after feeding back to the oscilloscope 21, a corresponding picture brightness signal timing diagram is displayed on the oscilloscope 21.
Based on the above embodiments, the timing information determining module 202 is specifically configured to:
receiving a first voltage signal timing diagram and a picture brightness signal timing diagram displayed by the oscilloscope 21 in the first test environment;
recording a first voltage rising edge time point and a first voltage falling edge time point in the first voltage signal time sequence diagram, and a first brightness rising edge time point and a first brightness falling edge time point in the picture brightness signal time sequence diagram;
determining a first rising time sequence difference and a first falling time sequence difference as time sequence difference information in the first test environment;
the first rising time sequence difference is a difference value between the first brightness rising time point and a first voltage rising time point;
the first falling time sequence difference is a difference value between the first brightness falling edge time point and the first voltage falling edge time point.
In this embodiment, oscilloscope 21 may present two signal timing diagrams in a first test environment. Fig. 4 is a diagram showing two signal timing diagrams of the oscilloscope 21 in the system according to the present embodiment under the first test environment. As shown in fig. 4, in the timing chart presented by the oscilloscope 21, one of the timing charts is a first voltage signal timing chart 41 corresponding to the liquid crystal display in the display device 100 to be tested, and the other is a picture brightness signal timing chart 42 corresponding to the liquid crystal display in the display device 100 to be tested. In the first voltage signal timing chart 41, the first voltage rising edge time point t1 and the first voltage falling edge time point t1 'are included, and the screen luminance signal timing chart 42 includes the first luminance rising edge time point t2 and the first luminance falling edge time point t2'.
As described above with reference to fig. 4, the timing information determining module 202 may determine the time difference Δt1 between T2 and T1, and record the time difference Δt1 'between T2' and T1', which may be referred to as the first rising time difference Δt1 and the first falling time difference Δt1' together as the timing difference information under the first test environment.
Further, when the current display test environment is the second test environment,
the oscilloscope 21 is connected with the output end of the backlight constant current driving board on the display device 100 to be tested through a current probe matched with the second test environment and is used for displaying a first current signal time sequence diagram corresponding to the measured backlight driving current under the second test environment;
the photosensitive sensor 22 is configured to collect backlight brightness information of the display screen of the display device 100 to be tested in the second test environment, and transmit the backlight brightness information to the oscilloscope 21 to display a corresponding backlight brightness signal timing chart.
The present embodiment preferably gives a description of information of the oscilloscope 21 and the photosensor 22 when the current display test environment is the second test environment. The oscilloscope 21 uses a current probe as a target probe, and is connected with the output end of the backlight constant current driving board, and the output end can be currently regarded as a target end. In the process that the test control terminal 20 controls the display device 100 to be tested to be presented in the second test environment, the oscilloscope 21 measures the current value of the backlight module and displays a corresponding first current signal timing diagram.
The photosensitive sensor 22 can collect backlight brightness information of the display screen in real time after approaching the display screen of the display device 100 to be tested, and after feeding back to the oscilloscope 21, a corresponding backlight brightness signal timing diagram is displayed on the oscilloscope 21.
Based on the above embodiments, the timing information determining module 202 is specifically configured to:
receiving a first current signal timing diagram and a backlight brightness signal timing diagram displayed by the oscilloscope 21 in the second test environment;
recording a first current rising edge time point and a first current falling edge time point in the first current signal time sequence diagram, and a second brightness rising edge time point and a second brightness falling edge time point in the picture brightness signal time sequence diagram;
determining a second rising time sequence difference and a second falling time sequence difference as time sequence difference information under the second test environment;
the second rising time sequence difference is a difference value between the second brightness rising edge time point and the first current rising edge time point;
the second falling time sequence difference is a difference value between the second brightness falling edge time point and the first current falling edge time point.
In this embodiment, the oscilloscope 21 may also present two signal timing diagrams in the second test environment. Fig. 5 is a diagram showing two signal timing diagrams of the oscilloscope 21 in the system according to the present embodiment under the second test environment. As shown in fig. 5, in the timing chart presented by the oscilloscope 21, one of the timing charts is a first current signal timing chart 51 corresponding to the backlight module in the display device 100 to be tested, and the other is a backlight brightness signal timing chart 52 corresponding to the backlight module in the display device 100 to be tested. In the first current signal timing chart 51, the first current rising edge time point t3 and the first current falling edge time point t3 'are included, and the backlight luminance signal timing chart 52 includes the second luminance rising edge time point t4 and the second luminance falling edge time point t4'.
As described above with reference to fig. 5, the timing information determining module 202 may determine the time difference Δt2 between T4 and T3, and record the time difference Δt2 'between T4' and T3', and the second time difference Δt2' between the second rise and the second fall may be collectively referred to as the timing difference information under the second test environment.
Further, when the current display test environment is the third test environment,
the oscilloscope 21 is in contact connection with an output terminal of the flip chip film driving chip on the display device 100 to be tested through a voltage probe matched with the third test environment, and is used for displaying a second voltage signal timing diagram corresponding to the measured liquid crystal driving voltage under the third test environment;
the oscilloscope 21 is further connected to the output end of the backlight constant current driving board on the display device 100 to be tested through a current probe matched with the third test environment, and is used for displaying a second current signal timing diagram corresponding to the measured backlight driving current under the third test environment.
The present embodiment preferably gives an information description of the oscilloscope 21 when the current display test environment is the third test environment. The oscilloscope 21 uses a voltage probe and a current probe as target probes, and establishes point contact connection between the voltage probe and an output end on the flip-chip thin film driving chip, and connection between the current probe and an output end on the backlight constant current driving board, wherein both the output ends can be regarded as target ends.
In the process that the test control terminal 20 controls the display device 100 to be tested to present in the third test environment, the oscilloscope 21 measures the voltage value of the liquid crystal drive and displays the corresponding second voltage signal timing chart, and simultaneously measures the current value of the backlight module and displays the corresponding second current signal timing chart.
Based on the above embodiments, the timing information determining module 202 is specifically configured to:
receiving a second voltage signal timing diagram and a second current signal timing diagram displayed by the oscilloscope 21 in the third test environment;
recording a second voltage rising edge time point and a second voltage falling edge time point in the second voltage signal time sequence diagram, and a second current rising edge time point and a second current falling edge time point in the second current signal time sequence diagram;
determining a third rising time sequence difference and a third falling time sequence difference as time sequence difference information under the third test environment;
the third rising time sequence difference is a difference value between the second current rising edge time point and a second voltage rising edge time point;
the third falling time sequence difference is the difference between the second current falling edge time point and the second voltage falling edge time point.
In this embodiment, the oscilloscope 21 may also present two signal timing diagrams in the third test environment. Fig. 6 is a diagram showing two signal timing diagrams of the oscilloscope 21 in the system according to the present embodiment under the third test environment. As shown in fig. 6, in the timing chart presented by the oscilloscope 21, one of the timing charts 61 is a timing chart of the second voltage signal of the liquid crystal display in the display device 100 to be tested, and the other is a timing chart 62 of the second current signal corresponding to the backlight module in the display device 100 to be tested. The second voltage signal timing diagram 61 includes a second voltage rising edge time point t5 and a second voltage falling edge time point t5'; in the second current signal timing diagram 62, a second current rising edge time point t6 and a second current falling edge time point t6' are included.
As described above with reference to fig. 6, the timing information determining module 202 may determine the time difference Δt0 between T6 and T5, and record as the third rising time difference, and the time difference Δt0 'between T6' and T5', and record as the third falling time difference, and the third rising time difference Δt0 and the third falling time difference Δt0' may be collectively referred to as the timing difference information under the third test environment.
It should be noted that, after the signal timing diagrams presented in each display test environment are obtained, the timing information determining module 202 may determine, by analyzing the received signal timing diagrams, the positions of the rising edge time point and the falling edge time point of each signal timing diagram, and the corresponding time values. The present embodiment preferably sets the position of the rising edge time point at 90% of the rising from the lowest point to the highest point, and the position of the falling edge time point at 10% of the falling from the highest point to the lowest point.
Further, the response delay determining module 201 includes:
the information acquisition unit is used for acquiring a first rising time sequence difference and a first falling time sequence difference in the time sequence difference information corresponding to the first test environment, a second rising time sequence difference and a second falling time sequence difference in the time sequence difference information corresponding to the second test environment, and a third rising time sequence difference and a third falling time sequence difference in the time sequence difference information corresponding to the third test environment;
a first response delay determining unit, configured to determine first response delay information of the local backlight in the display device 100 to be tested when the screen content of the display screen is from black to white according to the first rising timing difference, the second rising timing difference and the third rising timing difference;
And the second response delay determining unit is configured to determine second response delay information of the local backlight in the display device 100 to be tested when the display screen picture content is from white to black according to the first falling time sequence difference, the second falling time sequence difference and the third falling time sequence difference.
The embodiment preferably provides a specific implementation of the response delay information existing in the local backlight when the content of the screen displayed by the display device 100 to be tested changes by the response delay determining module 201. As can be seen from the above description, the content of the screen displayed in the setting area of the display interface on the display device 100 to be tested has a screen change from black to white and from white to black. The response delay determining module 201 may determine the first response delay information corresponding to the local backlight when the picture content is from black to white and the second response delay information corresponding to the local backlight when the picture content is from white to black, respectively.
Specifically, the first rising timing difference Δt1 and the first falling timing difference Δt1', the second rising timing difference Δt2 and the second falling timing difference Δt2', and the third rising timing difference Δt0 and the third falling timing difference Δt0' fed back by the information timing information determining module 202 may be acquired by the information acquiring unit; then, the first response delay information is determined by the first response delay determining unit, and the second response delay information is determined by the second response delay determining unit.
On the basis of the above embodiment, the first response delay determining unit is specifically configured to:
if the third rising time sequence difference is smaller than 0, determining that the power supply time of the display screen panel is longer than the power supply time of the backlight module as a first response delay reason, and inputting the first rising time sequence difference, the second rising time sequence difference and the third rising time sequence difference into a given delay calculation formula to obtain a first response delay time of the local backlight in the display screen picture content of the display device 100 to be tested from black to white; otherwise the first set of parameters is selected,
determining that the power supply time of the display screen panel is later than the power supply time of the backlight module as a first response delay reason, and determining a delay calculation formula according to the comparison result of the third rising time sequence difference and the second rising time sequence difference to obtain a first response delay when the picture content of the local backlight in the display screen of the display device 100 to be tested is from white to black;
the first response delay cause and the first response delay time are recorded as first response delay information.
On the basis of the above embodiment, the second response delay determining unit is specifically configured to:
if the third descending time sequence difference is smaller than 0, determining that the power supply time of the display screen panel is longer than the power supply time of the backlight module as a second response delay reason, and inputting the first descending time sequence difference, the second descending time sequence difference and the third descending time sequence difference into a given delay calculation formula to obtain a second response delay time of the local backlight in the display screen picture content of the display device 100 to be tested from black to white; otherwise the first set of parameters is selected,
Determining that the power supply time of the display screen panel is later than the power supply time of the backlight module as a first response delay reason, and determining a delay calculation formula according to the comparison result of the third descending time sequence difference and the second descending time sequence difference to obtain a second response delay time when the picture content of the local backlight of the display device 100 to be tested is from white to black;
and recording the second response delay reason and the second response delay time as second response delay information.
It is known that the response delay of the local backlight is often related to the time difference between the power supply of the display panel and the backlight module. In this embodiment, the response delay determining module 201 may determine whether the power supply of the display panel is earlier or later than the backlight module by using all the timing difference information fed back by the timing information determining module 202.
The response delay determining module 201 may determine whether the power supply time of the display panel is earlier than the power supply time of the backlight module by determining whether the third rising timing difference or the third falling timing difference is less than 0, and use the determination result as a corresponding response delay cause.
It should be noted that, in this embodiment, after determining the response delay reason, a delay calculation formula corresponding to the response delay reason may be selected to calculate the specific value of the response delay. Specifically, in this embodiment, the test control terminal 20 may preset delay calculation formulas corresponding to different response delay reasons, find a matched delay calculation formula according to the actual response delay reasons in an actual test, and substitute the first rising/falling timing difference, the second rising/falling timing difference, and the third rising/falling timing difference into the matched delay calculation formulas to obtain a specific delay time value of the response delay.
For example, the delay calculation formulas set in advance for different response delay causes by the test control terminal 20 are described as follows:
if the power supply time of the display screen panel is earlier than the power supply time of the backlight module, the corresponding delay calculation formula can be expressed as: Δt= | (t0+t2) -t1|.
If the power supply time of the display screen panel is later than the power supply time of the backlight module, the third rising/falling time sequence difference and the second rising/falling time sequence difference are required to be compared again, and a corresponding delay calculation formula is determined according to the comparison result;
Wherein, if the third rising/falling timing difference is greater than the second rising/falling timing difference, the corresponding delay calculation formula may be expressed as: Δt= (T0-T2) +t1;
if the third rise/fall timing difference is less than or equal to the second rise/fall timing difference, the corresponding delay calculation formula may be expressed as: Δt= | (T2-T0) -T1|.
In the response delay calculation formula, Δt represents a specific value of the response delay, T0 represents a third rising/falling timing difference, T1 represents a first rising/falling timing difference, and T2 represents a second rising/falling timing difference.
In this embodiment, the first response delay determining unit and the second response delay determining unit may determine, respectively, the first response delay information of the local backlight when the displayed screen is from black to white and the second response delay information of the local backlight when the displayed screen is from white to black by the above-described formulas.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Note that the above is only a preferred embodiment of the present application and the technical principle applied. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, while the application has been described in connection with the above embodiments, the application is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the application, which is set forth in the following claims.
Claims (12)
1. A quantitative evaluation system for local backlight response delay, comprising: the device comprises a test control terminal, an oscilloscope and a photosensitive sensor, wherein the oscilloscope is connected with the test control terminal and the photosensitive sensor;
the test control terminal is connected with the display equipment to be tested and is used for simulating and forming a corresponding display test environment by controlling the display state of the display equipment to be tested;
the oscilloscope is connected with a target end in the display equipment to be tested through a target probe matched with the current display test environment and is used for displaying an electric signal time sequence diagram corresponding to the display equipment to be tested under the current display test environment;
The photosensitive sensor is used for collecting brightness information of the display equipment to be tested in the current display test environment and transmitting the brightness information to the oscilloscope to display a corresponding brightness signal time sequence chart;
the test control terminal is used for determining response delay information of the local backlight in the display equipment to be tested according to the received electric signal time sequence diagram and/or the received brightness signal time sequence diagram in each display test environment, wherein the response delay information comprises response delay reasons and response delay time.
2. The system of claim 1, wherein the test control terminal comprises:
the time sequence information determining module is used for receiving an electric signal time sequence diagram and/or a brightness signal time sequence diagram displayed by the oscilloscope in the current display test environment and determining time sequence difference information in the current display test environment;
and the response delay determining module is used for determining response delay information when the local backlight in the display equipment to be tested changes relative to the picture content of the display screen according to the time sequence difference information under each display test environment.
3. The system of claim 2, wherein the test control terminal further comprises an environmental simulation control module,
The environment simulation control module is specifically configured to:
the display equipment to be tested is controlled to close a local backlight function and keep the backlight module in a normally-on state, then the picture content displayed in a set area on the display screen is controlled to be changed from black to white, and then the picture content is changed from white to black, so that a simulated first test environment is formed; or alternatively, the process may be performed,
the display equipment to be tested is controlled to close a local backlight function, picture content in a set area on the display screen is controlled to continuously display white, and a backlight constant current driving plate is controlled to turn from close backlight to open backlight and then from open backlight to close backlight, so that a simulated second test environment is formed; or alternatively, the process may be performed,
and controlling the display equipment to be tested to turn on a local backlight function, and controlling the picture content displayed in a set area on the display screen to be changed from black to white and then from white to black, so as to form a simulated third test environment.
4. The system of claim 3, wherein, when the currently displayed test environment is the first test environment,
the oscilloscope is in contact connection with the output end of the flip-chip thin film driving chip on the display equipment to be tested through a voltage probe matched with the first test environment and is used for displaying a first voltage signal time sequence diagram corresponding to the measured liquid crystal driving voltage in the first test environment;
The photosensitive sensor is used for collecting the picture brightness information of the display screen of the display device to be tested in the first test environment and transmitting the picture brightness information to the oscilloscope to display a corresponding picture brightness signal time sequence chart.
5. The system of claim 4, wherein the timing information determination module is specifically configured to:
receiving a first voltage signal time sequence diagram and a picture brightness signal time sequence diagram displayed by the oscilloscope in the first test environment;
recording a first voltage rising edge time point and a first voltage falling edge time point in the first voltage signal time sequence diagram, and a first brightness rising edge time point and a first brightness falling edge time point in the picture brightness signal time sequence diagram;
determining a first rising time sequence difference and a first falling time sequence difference as time sequence difference information in the first test environment;
the first rising time sequence difference is a difference value between the first brightness rising time point and a first voltage rising time point;
the first falling time sequence difference is a difference value between the first brightness falling edge time point and the first voltage falling edge time point.
6. The system of claim 3, wherein, when the currently displayed test environment is the second test environment,
The oscilloscope is connected with the output end of the backlight constant current driving plate on the display equipment to be tested through a current probe matched with the second test environment and is used for displaying a first current signal time sequence diagram corresponding to the measured backlight driving current in the second test environment;
and the photosensitive sensor is used for collecting backlight brightness information of the display screen of the display device to be tested in the second test environment and transmitting the backlight brightness information to the oscilloscope to display a corresponding backlight brightness signal time sequence chart.
7. The system of claim 6, wherein the timing information determination module is specifically configured to:
receiving a first current signal time sequence diagram and a backlight brightness signal time sequence diagram displayed by the oscilloscope in the second test environment;
recording a first current rising edge time point and a first current falling edge time point in the first current signal time sequence diagram, and a second brightness rising edge time point and a second brightness falling edge time point in the picture brightness signal time sequence diagram;
determining a second rising time sequence difference and a second falling time sequence difference as time sequence difference information under the second test environment;
the second rising time sequence difference is a difference value between the second brightness rising edge time point and the first current rising edge time point;
The second falling time sequence difference is a difference value between the second brightness falling edge time point and the first current falling edge time point.
8. The system of claim 3, wherein, when the currently displayed test environment is the third test environment,
the oscilloscope is in contact connection with the output end of the flip-chip thin film driving chip on the display equipment to be tested through a voltage probe matched with the third test environment and is used for displaying a second voltage signal time sequence diagram corresponding to the measured liquid crystal driving voltage in the third test environment;
the oscilloscope is also connected with the output end of the backlight constant current driving plate on the display device to be tested through a current probe matched with the third test environment and is used for displaying a second current signal time sequence diagram corresponding to the measured backlight driving current under the third test environment.
9. The system according to claim 8, wherein the timing information determining module is specifically configured to:
receiving a second voltage signal time sequence chart and a second current signal time sequence chart which are displayed by the oscilloscope in the third test environment;
recording a second voltage rising edge time point and a second voltage falling edge time point in the second voltage signal time sequence diagram, and a second current rising edge time point and a second current falling edge time point in the second current signal time sequence diagram;
Determining a third rising time sequence difference and a third falling time sequence difference as time sequence difference information under the third test environment;
the third rising time sequence difference is a difference value between the second current rising edge time point and a second voltage rising edge time point;
the third falling time sequence difference is the difference between the second current falling edge time point and the second voltage falling edge time point.
10. A system according to claim 3, wherein the response delay determination module comprises:
the information acquisition unit is used for acquiring a first rising time sequence difference and a first falling time sequence difference in the time sequence difference information corresponding to the first test environment, a second rising time sequence difference and a second falling time sequence difference in the time sequence difference information corresponding to the second test environment, and a third rising time sequence difference and a third falling time sequence difference in the time sequence difference information corresponding to the third test environment;
the first response delay determining unit is used for determining first response delay information of the local backlight in the display device to be tested when the picture content of the display screen is from black to white according to the first rising time sequence difference, the second rising time sequence difference and the third rising time sequence difference;
and the second response delay determining unit is used for determining second response delay information of the local backlight in the display device to be tested when the picture content of the display screen is changed from white to black according to the first descending time sequence difference, the second descending time sequence difference and the third descending time sequence difference.
11. The system according to claim 10, wherein the first response delay determining unit is specifically configured to:
if the third rising time sequence difference is smaller than 0, determining that the power supply time of the display screen panel is longer than the power supply time of the backlight module as a first response delay reason, and inputting the first rising time sequence difference, the second rising time sequence difference and the third rising time sequence difference into a given delay calculation formula to obtain a first response delay time of the local backlight in the display screen picture content of the display equipment to be tested from black to white; otherwise the first set of parameters is selected,
determining that the power supply time of the display screen panel is later than that of the backlight module as a first response delay reason, and obtaining a first response delay of local backlight in the display screen picture content of the display equipment to be tested from white to black according to a delay calculation formula determined by a comparison result of the third rising time sequence difference and the second rising time sequence difference;
the first response delay cause and the first response delay time are recorded as first response delay information.
12. The system according to claim 10, wherein the second response delay determining unit is specifically configured to:
if the third descending time sequence difference is smaller than 0, determining that the power supply time of the display screen panel is longer than the power supply time of the backlight module as a second response delay reason, and inputting the first descending time sequence difference, the second descending time sequence difference and the third descending time sequence difference into a given delay calculation formula to obtain a second response delay time of the local backlight in the display screen picture content of the display equipment to be detected from black to white; otherwise the first set of parameters is selected,
Determining that the power supply time of the display screen panel is later than the power supply time of the backlight module as a first response delay reason, and obtaining a second response delay time of the local backlight in the display screen picture content of the display equipment to be tested from white to black according to a delay calculation formula determined by a comparison result of the third descending time sequence difference and the second descending time sequence difference;
and recording the second response delay reason and the second response delay time as second response delay information.
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| CN105405428A (en) * | 2015-12-09 | 2016-03-16 | Tcl移动通信科技（宁波）有限公司 | Display screen backlight brightness control method and system |
| CN106057137A (en) * | 2016-08-22 | 2016-10-26 | 信利光电股份有限公司 | Display device and brightness control method thereof |
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| US7477228B2 (en) * | 2003-12-22 | 2009-01-13 | Intel Corporation | Method and apparatus for characterizing and/or predicting display backlight response latency |
| JPWO2010098020A1 (en) * | 2009-02-26 | 2012-08-30 | パナソニック株式会社 | BACKLIGHT DEVICE AND VIDEO DISPLAY DEVICE USING THE SAME |
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| CN105405428A (en) * | 2015-12-09 | 2016-03-16 | Tcl移动通信科技（宁波）有限公司 | Display screen backlight brightness control method and system |
| CN106057137A (en) * | 2016-08-22 | 2016-10-26 | 信利光电股份有限公司 | Display device and brightness control method thereof |
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