CN116819811B - Method and system for measuring response time of liquid crystal display - Google Patents
Method and system for measuring response time of liquid crystal display Download PDFInfo
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Abstract
The invention provides a method and a system for measuring response time of a liquid crystal display, wherein the method comprises the steps of setting a plurality of test time points under a preset reference environment temperature, and outputting test images to the display for testing through a signal generator; by establishing a curve of the display screen brightness L a and the display screen temperature T; obtaining the display screen brightness L' a after temperature correction according to the change curve; correcting the display brightness L b and the response time curve by using the display screen brightness L 'a after temperature correction to obtain a corrected display brightness L' a and response time curve; the system used by the method comprises a test time point setting module, a test image output module, a first correction module, a second correction module and a response time calculation module, and by the method and the system, error defects caused by response time errors and display temperature changes due to the use of different types of brightness measurement devices are reduced.
Description
Technical Field
The invention relates to the technical field of liquid crystal displays, in particular to a method and a system for measuring response time of a liquid crystal display.
Background
Liquid crystal is a special state in which a substance exists, and it is different from a solid crystal having a fixed shape and having anisotropy in optical properties (having optical properties such as birefringence) and from a liquid having isotropy in optical properties without a fixed shape, and liquid crystal is a viscous liquid having anisotropy in optical properties (having optical properties such as birefringence). Because of their special physical, chemical and optical properties, liquid crystals are widely used in the fields of display technology, various optical devices, etc., such as liquid crystal displays made of liquid crystals.
Although the requirements of different fields on the performance of the liquid crystal display device are different, the wide viewing angle, the high contrast ratio, the wide color gamut, the low power consumption and the fast response time are all technical challenges facing the liquid crystal display, wherein the response time of the liquid crystal display is a focus of special attention; in general, when response time measurement is performed on most liquid crystal displays, the response time specified by 305-1 standard, which is regulated by Video Electronics Standards Association (VESA), is measured, specifically, two different gray levels (hereinafter, referred to as gray level a and gray level B) are preset first, and the change of the gray level corresponds to the change of brightness of the liquid crystal display. The response time is defined as the arrival time of 90% of the initial luminance versus target luminance difference. Then, a rise time Tr for the luminance to reach 90% from 10% when the image displayed by the liquid crystal display is changed from the gradation level a to the gradation level B and a fall time Tf for the luminance to change from 90% to 10% when the image displayed by the liquid crystal display is changed from the gradation level B to the gradation level a are measured, and the sum of the rise time Tr and the fall time Tf is recorded as the response time of the liquid crystal display.
Currently, a method for measuring response time commonly used in industry generally collects dynamic optical signals on a liquid crystal display through an actual brightness measuring device (i.e. an optical sensor), and draws a "brightness-time" curve, i.e. a response time curve. The rising (10% -90%) and falling (90% -10%) times of the rising and falling edges are found from the curves as the rising and falling times of the response time.
Different models of actual brightness measuring devices are possible for use in the response time measuring system. The response time of the response time measuring system using different actual brightness measuring devices is different due to the difference of brightness sensing linearity of the various actual brightness measuring devices, so that measuring errors are generated, and meanwhile, the small change of the working temperature of the display can also cause the measuring errors in the measuring process.
Disclosure of Invention
The invention provides a method and a system for measuring response time of a liquid crystal display, which reduce the defects of the prior art that the response time measured by a response time measuring system is different due to the use of different kinds of actual brightness measuring devices and the error defect caused by the temperature change of the display.
The invention provides a method for measuring response time of a liquid crystal display, which comprises the following steps:
S1, setting a plurality of test time points at a preset reference environment temperature, wherein the test time points are set between twenty minutes and one hour when a screen is started; the preset reference environmental temperature is 22-25 ℃;
S2, outputting a test image to a display through a signal generator; the test image comprises different gray scale variation areas;
S3, obtaining the screen brightness L a of the display through the brightness detection device A; acquiring the screen temperature of the display through a temperature detection device; establishing a curve of the display screen brightness L a and the display screen temperature T; obtaining the display screen brightness L' a after temperature correction according to the change curve;
S4, acquiring curves of display brightness L b and response time of different test points through a brightness detection device B; correcting the display brightness L b and the response time curve by using the display screen brightness L 'a after temperature correction to obtain a corrected display brightness L' a and response time curve;
S5, calculating the response time of the display according to the corrected display brightness L' a and the response time curve.
Further, a method for measuring response time of a liquid crystal display, the S1 includes:
Establishing a curve of starting time and screen temperature change; and selecting test points according to the curve, wherein a time point corresponding to each 0.5 ℃ change of the temperature of the display is used as one test point, and the brightness change, the temperature and the response time of the display screen are tested under each test point.
Measuring a brightness gray scale curve by a brightness detection device; display luminance values are obtained using luminance gray-scale curve g=α× (1+l) β.
Further, a method for measuring response time of a liquid crystal display, the step S3 includes:
Establishing a matching relation between the brightness L a of the display and the change of the temperature T:
La＝f(T)＝x1T2+x2T+x3；
Fitting and determining the matching relation according to the temperatures and the brightness L a of different test points;
and calculating a brightness value L' a corresponding to the test temperature point according to the matching relation, namely, adding the standard brightness value after temperature correction.
Further, a method for measuring response time of a liquid crystal display, the step S4 includes:
Acquiring curves of display brightness L b and response time of different test points through a brightness detection device B, and establishing a functional relation between brightness L 'a and brightness L b through values of different test points of brightness L' a and brightness L b; the functional relationship is as follows:
L′a＝f(Lb)＝y1Lb 2+y2Lb+y3；
Determining the functional relation by fitting;
According to the functional relation, substituting L b into the matching relation to calculate a corrected brightness value L' a.
Further, a method for measuring response time of a liquid crystal display, the step S5 includes:
Calculating the response time of the display according to the corrected display brightness L' a and the curve of the response time combined with the curve of the brightness and the temperature;
calculating the final screen response time at the reference ambient temperature according to the response time Si obtained by different test points;
Wherein Min (L bi,L′ai)/Max(Lbi,L′ai) is the ratio of the different test points L b and L' a.
The invention proposes a measuring system of response time of a liquid crystal display, the system includes:
test time point setting module: setting a plurality of test time points at a preset reference environment temperature, wherein the test time points are set between twenty minutes and one hour when the screen is started; the preset reference environmental temperature is 22-25 ℃;
Test image output module: outputting the test image to a display through a signal generator; the test image comprises different gray scale variation areas;
A first correction module: acquiring the screen brightness L a of the display through a brightness detection device A; acquiring the screen temperature of the display by a temperature detection device; establishing a curve of the display screen brightness L a and the display screen temperature T; obtaining the display screen brightness L' a after temperature correction according to the change curve;
A second correction module: acquiring curves of display brightness L b and response time of different test points through a brightness detection device B; correcting the display brightness L b and the response time curve by using the display screen brightness L 'a after temperature correction to obtain a corrected display brightness L' a and response time curve;
And a response time calculation module: the response time of the display is calculated from the corrected display brightness L' a and the response time curve.
Further, a system for measuring response time of a liquid crystal display, the test time point setting module includes:
a test point selection module: establishing a curve of starting time and screen temperature change; and selecting test points according to the curve, wherein a time point corresponding to each 0.5 ℃ change of the temperature of the display is used as one test point, and the brightness change, the temperature and the response time of the display screen are tested under each test point.
A brightness value acquisition module: measuring a brightness gray scale curve by a brightness detection device; display luminance values are obtained using luminance gray-scale curve g=α× (1+l) β.
Further, a system for measuring response time of a liquid crystal display, the first correction module includes:
the first matching relation establishing module: establishing a matching relation between the brightness L a of the display and the change of the temperature T:
La＝f(T)＝x1T2+x2T+x3；
A first matching relationship confirmation module: fitting and determining the matching relation according to the temperatures and the brightness L a of different test points;
A first brightness correction module: and calculating a brightness value L' a corresponding to the test temperature point according to the matching relation, namely, adding the standard brightness value after temperature correction.
Further, a system for measuring response time of a liquid crystal display, the second correction module includes:
The second matching relation establishing module: acquiring curves of display brightness L b and response time of different test points through a brightness detection device B, and establishing a functional relation between brightness L 'a and brightness L b through values of different test points of brightness L' a and brightness L b; the functional relationship is as follows:
L′a＝f(Lb)＝y1Lb 2+y2Lb+y3；
the second matching relation determining module: determining the functional relation by fitting;
And the second brightness correction module substitutes L b into the matching relation to calculate corrected brightness value L' a according to the functional relation.
Further, a system for measuring response time of a liquid crystal display, the response time calculating module includes:
test point response time calculation module: calculating the response time of the display according to the corrected display brightness L' a and the curve of the response time combined with the curve of the brightness and the temperature;
and a final response time calculation module: calculating the final screen response time S at the reference ambient temperature according to the response time Si obtained by different test points;
Wherein Min (L bi,L′ai)/Max(Lbi,L′ai) is the ratio of the different test points L b and L' a.
The invention has the beneficial effects that: by testing different gray scale change areas, all pixels of the display can be covered by the method and the system for measuring the response time of the liquid crystal display, so that a comprehensive measurement result is obtained. A plurality of test time points are set at a preset reference environment temperature, and the steps of multipoint test, correction, calculation and the like are adopted, so that the reliability and the accuracy of the test are improved, the change condition of response time of the display after long-time use can be considered, the influence of temperature and brightness on the response time can be eliminated by establishing a display screen brightness and temperature change curve and correcting, and an accurate test result can be obtained; the brightness and the temperature of the display are obtained through the brightness detection device A and the temperature detection device, a curve of the brightness and the temperature change of the display is established, and the brightness value is obtained through the brightness gray-scale curve, so that the standard brightness value of the display after temperature correction can be accurately calculated; the brightness detection device B is used for obtaining the brightness and response time curves of the display of different test points, and carrying out temperature correction on the brightness and response time curves to obtain corrected brightness and response time curves of the display, so that the response time of the display can be measured more accurately; the method can effectively and comprehensively measure the response time of the liquid crystal display and improve the measurement accuracy.
Drawings
FIG. 1 is a schematic diagram of a method for measuring response time of a liquid crystal display according to the present invention;
fig. 2 is a schematic diagram of a system for measuring response time of a liquid crystal display according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
The method for measuring response time of liquid crystal display of the embodiment comprises the steps of firstly calibrating a brightness monitoring device A under different working temperatures of the display, and then calibrating a brightness detecting device A and a brightness detecting device B;
The brightness detection device a is a standard brightness measuring instrument, preferably a CS2000 type brightness analyzer, a CA310 type color analyzer, etc., and generally obtains a brightness value by measuring a gamma curve, that is, a brightness-gray level curve, and uses the obtained standard brightness value as a first measured brightness value; however, the standard brightness measuring instrument can only detect the brightness change along with the gray scale, and cannot detect the brightness change along with time; the brightness detection device B is used for detecting the brightness of the liquid crystal display to generate a second measurement brightness value, and the real brightness detection device B is an optical sensor commonly adopted in the industry of the liquid crystal display and is a photodiode, so that the cost for manufacturing a response time measurement system can be reduced; the temperature detection device comprises a temperature sensor;
the embodiment provides a method for measuring response time of a liquid crystal display, which comprises the following steps:
S1, setting a plurality of test time points at a preset reference environment temperature, wherein the test time points are set between twenty minutes and one hour when a screen is started; the preset reference environmental temperature is 22-25 ℃; preferably 22 ℃;
S2, outputting a test image to a display through a signal generator; the test image comprises different gray scale variation areas;
S3, obtaining the screen brightness (namely the brightness of a test image) L a of the display at different test time points through a brightness detection device A; acquiring the screen temperature of the display through a temperature detection device; establishing a curve of the display screen brightness L a and the display screen temperature T; obtaining the display screen brightness L' a after temperature correction according to the change curve;
S4, acquiring curves of display brightness L b and response time at different test time points through a brightness detection device B; correcting the display brightness L b and the response time curve by using the display screen brightness L 'a after temperature correction to obtain a corrected display brightness L' a and response time curve;
S5, calculating the response time of the display according to the corrected display brightness L' a and the response time curve.
The working principle of the technical scheme is as follows: setting a plurality of test time points at a preset reference environment temperature, wherein the test time points are set between twenty minutes and one hour when the screen is started; the preset reference ambient temperature is 22-25 ℃. This is because the response time of the display changes with temperature changes, and it is necessary to perform the test in the same environment for ensuring the accuracy and reliability of the test; outputting the test image to a display through a signal generator; the test image comprises different gray level change areas, and common video content is simulated through the continuously changed gray level areas so as to simulate an actual use scene as truly as possible, thereby better evaluating the response time performance of the display; the brightness detection device A is used for obtaining the brightness L a of the display screen, and the temperature detection device is used for obtaining the temperature of the display screen; and establishing a curve of the display screen brightness L a a and the display screen temperature T, and obtaining an accurate brightness and temperature change curve through multiple measurement and data analysis. Obtaining the display screen brightness L' a after temperature correction according to the change curve so as to accurately reflect the display brightness in the current environment; acquiring curves of display brightness L b and response time of different test points through a brightness detection device B; correcting the display brightness L b and the response time curve by using the display screen brightness L b after temperature correction, eliminating the influence of temperature and brightness on the response time, and obtaining a corrected display brightness L' a and the response time curve; calculating the response time of the display according to the corrected display brightness L' a and the response time curve to obtain a final test result; the calculation method generally adopts the switching time from black to white to black, or the switching time from gray level 50% to gray level 80% to gray level 50%, and the like, and different calculation methods are applicable to different test requirements and need to be selected according to actual conditions.
The principle and effect of the technical scheme are as follows: by testing different gray scale change areas, the method can cover all pixels of the display so as to obtain a comprehensive measurement result. A plurality of test time points are set at a preset reference environment temperature, and the steps of multipoint test, correction, calculation and the like are adopted, so that the reliability and the accuracy of the test are improved, the change condition of response time of the display after long-time use can be considered, the influence of temperature and brightness on the response time can be eliminated by establishing a display screen brightness and temperature change curve and correcting, and an accurate test result can be obtained; the brightness and the temperature of the display are obtained through the brightness detection device A and the temperature detection device, a curve of the brightness and the temperature change of the display is established, and the brightness value is obtained through the brightness gray-scale curve, so that the standard brightness value of the display after temperature correction can be accurately calculated; the brightness detection device B is used for obtaining the brightness and response time curves of the display of different test points, and carrying out temperature correction on the brightness and response time curves to obtain corrected brightness and response time curves of the display, so that the response time of the display can be measured more accurately; the method can effectively and comprehensively measure the response time of the liquid crystal display and improve the measurement accuracy.
In this embodiment, the method for measuring response time of a liquid crystal display, the S1 includes:
Establishing a curve of starting time and screen temperature change; and selecting test points according to the curve, wherein a time point corresponding to each 0.5 ℃ change of the temperature of the display is used as one test point, and the brightness change, the temperature and the response time of the display screen are tested under each test point.
Measuring a brightness gray scale curve by a brightness detection device; display luminance values are obtained using luminance gray-scale curve g=α× (1+l) β.
The working principle of the technical scheme is as follows: in order to eliminate the influence of temperature on a test result, the method establishes a curve of starting time and screen temperature change, selects proper test points according to the curve, and tests brightness change, temperature and response time of a display screen under each test point; therefore, the temperature change condition of the liquid crystal display can be accurately mastered, and the test result is corrected, so that more accurate response time data is obtained; the brightness gray-scale curve is measured by the brightness detection device, and the brightness value of the display is calculated by the formula g=α× (1+l) α. The calculation mode can convert photoelectricity into standardized digital signals, so that the accuracy and stability of measurement are improved; according to the method, a plurality of parameters such as brightness change, temperature and response time of the display screen are tested under each test point, so that the performance of the liquid crystal display can be comprehensively and finely known.
The technical scheme has the effects that: by establishing a curve of the starting time and the screen temperature change and utilizing methods such as temperature correction, brightness gray scale curve, response time curve and the like, the influence of temperature and brightness on a test result can be eliminated, so that more accurate response time data is provided; the test is carried out according to the fixed test points, and meanwhile, the error and uncertainty in the test process can be avoided by combining the brightness gray scale curve measured by the brightness detection device, so that the reliability and stability of the test result are ensured.
In this embodiment, the method for measuring response time of a liquid crystal display, the S3 includes:
Establishing a matching relation between the brightness L a of the display and the change of the temperature T:
La＝f(T)＝x1T2+x2T+x3；
Fitting and determining the matching relation according to the temperatures and the brightness L a of different test points; fitting by using analysis software such as JMP or matlab, and calculating to obtain a value of x 1,x2,x3 by using a least square method; thereby determining the matching relationship;
and calculating a brightness value L' a corresponding to the test temperature point according to the matching relation, namely, adding the standard brightness value after temperature correction.
The working principle of the technical scheme is as follows: in order to eliminate the influence of temperature on the brightness value of the liquid crystal display, a matching relationship between the brightness and the temperature of the display, namely L a＝f(T)＝x1T2+x2T+x3, is established; under different test points, the matching relation is determined according to the obtained temperature and brightness value fitting, so that the standard brightness value L' a corresponding to the test temperature point can be accurately calculated; when the matching is performed by using analysis software such as JMP or matlab, the least square method is used for calculating the values of x 1、x2 and x 3 in the matching relation; the least square method has excellent mathematical properties and statistical significance, is widely applied to model fitting, and can provide more accurate fitting results. By establishing a matching relation between temperature and brightness, the method can eliminate the influence of temperature on the brightness value of the liquid crystal display, thereby calculating a standard brightness value L' a after temperature correction is added; the standard luminance value can better reflect the actual luminance level of the display for subsequent response time measurement and analysis.
The technical scheme has the effects that: a refinement test has been performed in S1, and the features of S3 further promote the accuracy and reliability of the test. By establishing a matching relation between temperature and brightness and calculating a standard brightness value after temperature correction, the influence of external factors on the brightness value of the liquid crystal display can be better eliminated, and a more accurate and reliable result is obtained when response time measurement and analysis are carried out; in a word, the method for measuring the response time of the liquid crystal display realizes the standard brightness value of temperature correction on the characteristic of S3, establishes the matching relation between the temperature and the brightness by using least square fitting, and can better ensure the refinement and the accuracy of the test.
In this embodiment, the method for measuring response time of a liquid crystal display, S4 includes:
Acquiring curves of display brightness L b and response time of different test points through a brightness detection device B, and establishing a functional relation between brightness L 'a and brightness L b through values of different test points of brightness L' a and brightness L b; the functional relationship is as follows:
L′a＝f(Lb)＝y1Lb 2+y2Lb+y3；
Determining the functional relation by fitting;
Fitting by using analysis software such as JMP or matlab, and calculating to obtain a value of y 1,y2,y3 by using a least square method; thereby determining the functional relationship;
According to the functional relation, substituting L b into the matching relation to calculate a corrected brightness value L' a.
The working principle of the technical scheme is as follows: by establishing a functional relationship between luminance L 'a and luminance L b, the difference between the display luminance L b at different test points and the corrected standard luminance value L' a can be eliminated. The actual brightness level can be reflected more accurately by calculating the corrected standard brightness value L' a, so that the reliability of the test result is improved; fitting is carried out by using JMP or matlab analysis software, and the values of y 1、y2 and y 3 in the functional relation are calculated by using a least square method. The determination of the parameters can enable the functional relation to describe the change rule between the brightness L' a and the brightness L b more accurately, and provides a better basis for the subsequent response time measurement; the difference between the display brightness L b of different test points and the corrected standard brightness value L 'a can be better eliminated by calculating the corrected standard brightness value L' a, so that the test precision and accuracy are improved, and the method has an important role in quality control and performance evaluation of the liquid crystal display.
The technical scheme has the effects that: by establishing a functional relationship between luminance L 'a and luminance L b, the difference between the display luminance L b at different test points and the corrected standard luminance value L' a can be eliminated. The actual brightness level can be reflected more accurately by calculating the corrected standard brightness value L' a, so that the reliability of the test result is improved. Fitting is carried out by using JMP or matlab analysis software, and the values of y 1、y2 and y 3 in the functional relation are calculated by using a least square method. The determination of the parameters can enable the functional relation to describe the change rule between the brightness L' a and the brightness L b more accurately, and provides a better basis for the subsequent response time measurement; the difference between the display brightness L b of different test points and the corrected standard brightness value L 'a can be better eliminated by calculating the corrected standard brightness value L' a, so that the test precision and accuracy are improved, and the method plays an important role in quality control and performance evaluation of the liquid crystal display; obtaining curves of display brightness L b and response time of different test points through a brightness detection device B, and establishing a functional relation between brightness L' a and brightness L b; the method for correcting by comprehensively using the data of the plurality of test points can more comprehensively consider the response time characteristics of the liquid crystal display under different conditions, thereby more comprehensively evaluating the performance of the liquid crystal display.
In this embodiment, the method for measuring response time of a liquid crystal display, the S5 includes:
Calculating the response time of the display according to the corrected display brightness L' a and the curve of the response time combined with the curve of the brightness and the temperature;
Calculating the final screen response time S at the reference ambient temperature according to the response time Si obtained by different test points;
Wherein, the ratio of Min (L bi,L′ai)/Max(Lbi,L′ai) to L b to L' a is different, i=1, 2,3 … n, n is the number of test points; for example, if all test points L bi>L′ai, the formula is
The working principle and the effect of the technical scheme are as follows: calculating the response time of the display according to the corrected display brightness L' a and the response time curve and combining the brightness and temperature considered curves; the response time characteristics of the liquid crystal display can be reflected more accurately by performing the calculation while taking the brightness and the temperature into consideration. Moreover, in this process, the influence between the display brightness and the ambient temperature of different test points can be eliminated. Calculating the ratio of the brightness values of the second brightness detection device to the first brightness detection device after temperature calibration in a reference environment, wherein the smaller value of the two test values is larger and is used as the offset coefficient of the test point, and calculating the final screen response time according to the response time and the offset coefficient of different points, so that the response time and brightness change of different test points can be effectively and comprehensively considered, the error is reduced, and the reliability of the measurement result is improved; the method can eliminate random errors in response time data, thereby improving the reliability and precision of the result; moreover, the average value of the results of the plurality of test points can better reflect the overall performance of the liquid crystal display. In addition, the response time characteristics of the liquid crystal display are more comprehensively evaluated by combining the response time data of different test points and comprehensively considering the influence of the brightness and the temperature; the method can better reflect the response speed of the liquid crystal display under different test conditions, and has more comprehensive application prospect.
In summary, the response time of the weighted average of the plurality of test points and the overall response time measurement method are calculated by combining the brightness and the temperature of the display. The characteristics can better reflect the response time characteristics of the liquid crystal display, improve the test precision and the application range, and provide assistance for quality control and performance evaluation of the liquid crystal display.
A system for measuring response time of a liquid crystal display according to this embodiment includes:
test time point setting module: setting a plurality of test time points at a preset reference environment temperature, wherein the test time points are set between twenty minutes and one hour when the screen is started; the preset reference environmental temperature is 22-25 ℃;
Test image output module: outputting the test image to a display through a signal generator; the test image comprises different gray scale variation areas;
A first correction module: acquiring the screen brightness L a of the display through a brightness detection device A; acquiring the screen temperature of the display by a temperature detection device; establishing a curve of the display screen brightness L a and the display screen temperature T; obtaining the display screen brightness L' a after temperature correction according to the change curve;
A second correction module: acquiring curves of display brightness L b and response time of different test points through a brightness detection device B; correcting the display brightness L b and the response time curve by using the display screen brightness L 'a after temperature correction to obtain a corrected display brightness L' a and response time curve;
And a response time calculation module: the response time of the display is calculated from the corrected display brightness L' a and the response time curve.
The working principle of the technical scheme is as follows: setting a plurality of test time points at a preset reference environment temperature, wherein the test time points are set between twenty minutes and one hour when the screen is started; the preset reference ambient temperature is 22-25 ℃. This is because the response time of the display changes with temperature changes, and it is necessary to perform the test in the same environment for ensuring the accuracy and reliability of the test; outputting the test image to a display through a signal generator; the test image comprises different gray level change areas, and common video content is simulated through the continuously changed gray level areas so as to simulate an actual use scene as truly as possible, thereby better evaluating the response time performance of the display; the brightness detection device A is used for obtaining the brightness L a of the display screen, and the temperature detection device is used for obtaining the temperature of the display screen; and establishing a curve of the display screen brightness L a a and the display screen temperature T, and obtaining an accurate brightness and temperature change curve through multiple measurement and data analysis. Obtaining the display screen brightness L' a after temperature correction according to the change curve so as to accurately reflect the display brightness in the current environment; acquiring curves of display brightness L b and response time of different test points through a brightness detection device B; correcting the display brightness L b and the response time curve by using the display screen brightness L b after temperature correction, eliminating the influence of temperature and brightness on the response time, and obtaining a corrected display brightness L' a and the response time curve; calculating the response time of the display according to the corrected display brightness L' a and the response time curve to obtain a final test result; the calculation method generally adopts the switching time from black to white to black, or the switching time from gray level 50% to gray level 80% to gray level 50%, and the like, and different calculation methods are applicable to different test requirements and need to be selected according to actual conditions.
The principle and effect of the technical scheme are as follows: by testing different gray scale change areas, the method can cover all pixels of the display so as to obtain a comprehensive measurement result. A plurality of test time points are set at a preset reference environment temperature, and the steps of multipoint test, correction, calculation and the like are adopted, so that the reliability and the accuracy of the test are improved, the change condition of response time of the display after long-time use can be considered, the influence of temperature and brightness on the response time can be eliminated by establishing a display screen brightness and temperature change curve and correcting, and an accurate test result can be obtained; the brightness and the temperature of the display are obtained through the brightness detection device A and the temperature detection device, a curve of the brightness and the temperature change of the display is established, and the brightness value is obtained through the brightness gray-scale curve, so that the standard brightness value of the display after temperature correction can be accurately calculated; the brightness detection device B is used for obtaining the brightness and response time curves of the display of different test points, and carrying out temperature correction on the brightness and response time curves to obtain corrected brightness and response time curves of the display, so that the response time of the display can be measured more accurately; the method can effectively and comprehensively measure the response time of the liquid crystal display and improve the measurement accuracy.
In this embodiment, the measurement system of response time of a liquid crystal display, the test time point setting module includes:
a test point selection module: establishing a curve of starting time and screen temperature change; and selecting test points according to the curve, wherein a time point corresponding to each 0.5 ℃ change of the temperature of the display is used as one test point, and the brightness change, the temperature and the response time of the display screen are tested under each test point.
A brightness value acquisition module: measuring a brightness gray scale curve by a brightness detection device; display luminance values are obtained using luminance gray-scale curve g=α× (1+l) β.
The working principle and the effect of the technical scheme are as follows: in order to eliminate the influence of temperature on a test result, the method establishes a curve of starting time and screen temperature change, selects proper test points according to the curve, and tests brightness change, temperature and response time of a display screen under each test point; therefore, the temperature change condition of the liquid crystal display can be accurately mastered, and the test result is corrected, so that more accurate response time data is obtained; the brightness gray-scale curve is measured by the brightness detection device, and the brightness value of the display is calculated by the formula g=α× (1+l) β. The calculation mode can convert photoelectricity into standardized digital signals, so that the accuracy and stability of measurement are improved; according to the method, a plurality of parameters such as brightness change, temperature and response time of the display screen are tested under each test point, so that the performance of the liquid crystal display can be comprehensively and finely known.
In one embodiment, the system for measuring response time of a liquid crystal display, the first correction module includes:
the first matching relation establishing module: establishing a matching relation between the brightness L a of the display and the change of the temperature T:
La＝f(T)＝x1T2+L2T+x3；
A first matching relationship confirmation module: fitting and determining the matching relation according to the temperatures and the brightness L a of different test points; fitting by using analysis software such as JMP or matlab, and calculating to obtain a value of x 1,x2,x3 by using a least square method; thereby determining the matching relationship;
A first brightness correction module: and calculating a brightness value L' a corresponding to the test temperature point according to the matching relation, namely, adding the standard brightness value after temperature correction.
The working principle and the effect of the technical scheme are as follows: in order to eliminate the influence of temperature on the brightness value of the liquid crystal display, a matching relationship between the brightness and the temperature of the display, namely L a＝f(T)＝x1T2+x2T+x3, is established; under different test points, the matching relation is determined according to the obtained temperature and brightness value fitting, so that the standard brightness value L' a corresponding to the test temperature point can be accurately calculated; when the matching is performed by using analysis software such as JMP or matlab, the least square method is used for calculating the values of x 1、x2 and x 3 in the matching relation; the least square method has excellent mathematical properties and statistical significance, is widely applied to model fitting, and can provide more accurate fitting results. By establishing a matching relation between temperature and brightness, the method can eliminate the influence of temperature on the brightness value of the liquid crystal display, thereby calculating a standard brightness value L' a after temperature correction is added; the standard luminance value can better reflect the actual luminance level of the display for subsequent response time measurement and analysis.
In one embodiment, the second correction module includes:
The second matching relation establishing module: acquiring curves of display brightness L b and response time of different test points through a brightness detection device B, and establishing a functional relation between brightness L 'a and brightness L b through values of different test points of brightness L' a and brightness L b; the functional relationship is as follows:
L′a＝f(Lb)＝y1Lb 2+y2Lb+y3；
the second matching relation determining module: determining the functional relation by fitting;
Fitting by using analysis software such as JMP or matlab, and calculating to obtain a value of y 1,y2,y3 by using a least square method; thereby determining the functional relationship;
And the second brightness correction module substitutes L b into the matching relation to calculate corrected brightness value L' a according to the functional relation.
The working principle and the effect of the technical scheme are as follows: by establishing a functional relationship between luminance L 'a and luminance L b, the difference between the display luminance L b at different test points and the corrected standard luminance value L' a can be eliminated. The actual brightness level can be reflected more accurately by calculating the corrected standard brightness value L' a, so that the reliability of the test result is improved. Fitting is carried out by using JMP or matlab analysis software, and the values of y 1、y2 and y 3 in the functional relation are calculated by using a least square method. The determination of the parameters can enable the functional relation to describe the change rule between the brightness L' a and the brightness L b more accurately, and provides a better basis for the subsequent response time measurement; the difference between the display brightness L b of different test points and the corrected standard brightness value L 'a can be better eliminated by calculating the corrected standard brightness value L' a, so that the test precision and accuracy are improved, and the method plays an important role in quality control and performance evaluation of the liquid crystal display; obtaining curves of display brightness L b and response time of different test points through a brightness detection device B, and establishing a functional relation between brightness L' a and brightness L b; the method for correcting by comprehensively using the data of the plurality of test points can more comprehensively consider the response time characteristics of the liquid crystal display under different conditions, thereby more comprehensively evaluating the performance of the liquid crystal display.
In this embodiment, a system for measuring response time of a liquid crystal display, where the response time calculating module includes:
test point response time calculation module: calculating the response time of the display according to the corrected display brightness L' a and the curve of the response time combined with the curve of the brightness and the temperature;
and a final response time calculation module: calculating the final screen response time at the reference ambient temperature according to the response time Si obtained by different test points;
Wherein Min (L bi,L′ai)/Max(Lbi,L′ai) is the ratio of the different test points L b and L' a.
The working principle and the effect of the technical scheme are as follows: calculating the response time of the display according to the corrected display brightness L' a and the response time curve and combining the brightness and temperature considered curves; the response time characteristics of the liquid crystal display can be reflected more accurately by performing the calculation while taking the brightness and the temperature into consideration. Moreover, in this process, the influence between the display brightness and the ambient temperature of different test points can be eliminated. Calculating the ratio of the brightness values of the second brightness detection device to the first brightness detection device after temperature calibration in a reference environment, wherein the smaller value of the two test values is larger and is used as the offset coefficient of the test point, and calculating the final screen response time according to the response time and the offset coefficient of different points, so that the response time and brightness change of different test points can be effectively and comprehensively considered, the error is reduced, and the reliability of the measurement result is improved; the method can eliminate random errors in response time data, thereby improving the reliability and precision of the result; moreover, the average value of the results of the plurality of test points can better reflect the overall performance of the liquid crystal display. In addition, the response time characteristics of the liquid crystal display are more comprehensively evaluated by combining the response time data of different test points and comprehensively considering the influence of the brightness and the temperature; the method can better reflect the response speed of the liquid crystal display under different test conditions, and has more comprehensive application prospect.
In summary, the response time of the weighted average of the plurality of test points and the overall response time measurement method are calculated by combining the brightness and the temperature of the display. The characteristics can better reflect the response time characteristics of the liquid crystal display, improve the test precision and the application range, and provide assistance for quality control and performance evaluation of the liquid crystal display.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. A method for measuring response time of a liquid crystal display, the method comprising:
S1, setting a plurality of test time points at a preset reference environment temperature, wherein the test time points are set between twenty minutes and one hour when a screen is started; the preset reference environmental temperature is 22-25 ℃;
Wherein, the S1 comprises:
Establishing a curve of starting time and screen temperature change; selecting test points according to the curve, wherein a time point corresponding to each 0.5 ℃ change of the temperature of the display is used as one test point, and testing the brightness change, the temperature and the response time of the display screen under each test point;
measuring a brightness gray scale curve by a brightness detection device; obtaining a display brightness value by using a brightness gray-scale curve G=alpha× (1+L) β;
S2, outputting a test image to a display through a signal generator; the test image comprises different gray scale variation areas;
S3, obtaining the screen brightness L a of the display through the brightness detection device A; acquiring the screen temperature of the display through a temperature detection device; establishing a curve of the display screen brightness L a and the display screen temperature T; obtaining the display screen brightness L' a after temperature correction according to the change curve;
Wherein, the S3 includes:
Establishing a matching relation between the brightness L a of the display and the change of the temperature T:
La＝f(T)＝x1T2+x2T+x3；
Fitting and determining the matching relation according to the temperatures and the brightness L a of different test points;
Calculating a brightness value L' a corresponding to the test temperature point according to the matching relation, namely, a standard brightness value after temperature correction is added;
S4, acquiring curves of display brightness L b and response time of different test points through a brightness detection device B; correcting the display brightness L b and the response time curve by using the display screen brightness L 'a after temperature correction to obtain a corrected display brightness L' a and response time curve;
Wherein, the S4 includes:
the brightness detection device B is used for obtaining the curves of the brightness L b and response time of the display at different test points, and the brightness L' a and the brightness L b are used for different test points
Establishing a functional relationship between luminance L' a and luminance L b; the functional relationship is as follows:
L′a＝f(Lb)＝y1Lb 2+y2Lb+y3；
Determining the functional relation by fitting;
substituting L b into the matching relation according to the functional relation to calculate a corrected brightness value L' a;
S5, calculating the response time of the display according to the corrected display brightness L' a and the response time curve.
2. The method for measuring response time of a liquid crystal display according to claim 1, wherein S5 comprises:
Calculating the response time of the display according to the corrected display brightness L' a and the curve of the response time combined with the curve of the brightness and the temperature;
Calculating the final screen response time S at the reference ambient temperature according to the response time Si obtained by different test points;
Wherein, the ratio of L b to L' a of Min (L bi,L′ai)/Max(Lbi,L′ai) at different test points.
3. A system for measuring response time of a liquid crystal display, the system comprising:
test time point setting module: setting a plurality of test time points at a preset reference environment temperature, wherein the test time points are set between twenty minutes and one hour when the screen is started; the preset reference environmental temperature is 22-25 ℃;
wherein, the test time point setting module includes:
A test point selection module: establishing a curve of starting time and screen temperature change; selecting test points according to the curve, wherein a time point corresponding to each 0.5 ℃ change of the temperature of the display is used as one test point, and testing the brightness change, the temperature and the response time of the display screen under each test point;
A brightness value acquisition module: measuring a brightness gray scale curve by a brightness detection device; obtaining a display brightness value by using a brightness gray-scale curve G=alpha× (1+L) β;
Test image output module: outputting the test image to a display through a signal generator; the test image comprises different gray scale variation areas;
A first correction module: acquiring the screen brightness L a of the display through a brightness detection device A; acquiring the screen temperature of the display by a temperature detection device; establishing a curve of the display screen brightness L a and the display screen temperature T; obtaining the display screen brightness L' a after temperature correction according to the change curve;
wherein the first corrective module comprises:
the first matching relation establishing module: establishing a matching relation between the brightness L a of the display and the change of the temperature T:
La＝f(T)＝x1T2+x2T+x3；
A first matching relationship confirmation module: fitting and determining the matching relation according to the temperatures and the brightness L a of different test points;
A first brightness correction module: calculating a brightness value L' a corresponding to the test temperature point according to the matching relation, namely, a standard brightness value after temperature correction is added;
A second correction module: acquiring curves of display brightness L b and response time of different test points through a brightness detection device B; correcting the display brightness L b and the response time curve by using the display screen brightness L 'a after temperature correction to obtain a corrected display brightness L' a and response time curve;
wherein the second corrective module comprises:
The second matching relation establishing module: acquiring curves of display brightness L b and response time of different test points through a brightness detection device B, and establishing a functional relation between brightness L 'a and brightness L b through values of different test points of brightness L' a and brightness L b; the functional relationship is as follows:
L′a＝f(Lb)＝y1Lb 2+y2Lb+y3；
the second matching relation determining module: determining the functional relation by fitting;
The second brightness correction module substitutes L b into the matching relation to calculate corrected brightness value L' a according to the functional relation;
And a response time calculation module: the response time of the display is calculated from the corrected display brightness L' a and the response time curve.
4. A system for measuring response time of a liquid crystal display according to claim 3, wherein the response time calculation module comprises:
test point response time calculation module: calculating the response time of the display according to the corrected display brightness L' a and the curve of the response time combined with the curve of the brightness and the temperature;
and a final response time calculation module: calculating the final screen response time S at the reference ambient temperature according to the response time Si obtained by different test points;
Wherein Min (L bi,L′ai)/Max(Lbi,L′ai) is the ratio of the different test points L b and L' a.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6046719A (en) * | 1994-12-15 | 2000-04-04 | Sarnoff Corporation | Column driver with switched-capacitor D/A converter |
| US6593934B1 (en) * | 2000-11-16 | 2003-07-15 | Industrial Technology Research Institute | Automatic gamma correction system for displays |
| CN1673810A (en) * | 2005-04-19 | 2005-09-28 | 浙江大学 | Liquid crystal display response time electrooptical automatic measuring instrument |
| CN103197444A (en) * | 2013-03-22 | 2013-07-10 | 深圳市华星光电技术有限公司 | Method and system for measuring response time of liquid crystal display |
| CN103257468A (en) * | 2013-05-16 | 2013-08-21 | 中山大学 | Liquid crystal displayer response time measurement method based on reference brightness |
| CN115280763A (en) * | 2020-11-11 | 2022-11-01 | Jvc建伍株式会社 | Projection device, projection method, and program |
| CN116229913A (en) * | 2023-03-02 | 2023-06-06 | 上海天马微电子有限公司 | Display device, driving method thereof, relation determining method and electronic equipment |
-
2023
- 2023-07-18 CN CN202310883175.0A patent/CN116819811B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6046719A (en) * | 1994-12-15 | 2000-04-04 | Sarnoff Corporation | Column driver with switched-capacitor D/A converter |
| US6593934B1 (en) * | 2000-11-16 | 2003-07-15 | Industrial Technology Research Institute | Automatic gamma correction system for displays |
| CN1673810A (en) * | 2005-04-19 | 2005-09-28 | 浙江大学 | Liquid crystal display response time electrooptical automatic measuring instrument |
| CN103197444A (en) * | 2013-03-22 | 2013-07-10 | 深圳市华星光电技术有限公司 | Method and system for measuring response time of liquid crystal display |
| CN103257468A (en) * | 2013-05-16 | 2013-08-21 | 中山大学 | Liquid crystal displayer response time measurement method based on reference brightness |
| CN115280763A (en) * | 2020-11-11 | 2022-11-01 | Jvc建伍株式会社 | Projection device, projection method, and program |
| CN116229913A (en) * | 2023-03-02 | 2023-06-06 | 上海天马微电子有限公司 | Display device, driving method thereof, relation determining method and electronic equipment |
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