CN103257468B - A kind of liquid crystal display response time measuring method based on reference brightness - Google Patents
A kind of liquid crystal display response time measuring method based on reference brightness Download PDFInfo
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Abstract
The invention provides a kind of liquid crystal display response time measuring method based on reference brightness.In the resolution chart that this method adopts, include constant reference brightness region and the grey scale change district of 10% and 90% gray scale.By the brightness in synchro measure reference brightness district and grey scale change district, obtain the response time of liquid crystal display.The method can be avoided in conventional test methodologies, and the measuring error caused because backlight modulation causes measured brightness response curve unsmooth, effectively can improve the measuring accuracy of liquid crystal display response time.
Description
Technical field
The present invention relates to flat-panel display device field of measuring technique, particularly a kind of liquid crystal display response time measuring method based on reference brightness.
Background technology
Liquid crystal display is a kind of flat-panel monitor of passive luminescence, and it is primarily of compositions such as backlight, thin film transistor (TFT) (TFT) array, liquid crystal cell, colored filter, polaroids.Backlight is luminous through later, by the liquid crystal layer controlled by tft array, through another polaroid outgoing.Deflect under liquid crystal molecule alive driving outside, polarisation of light direction can be changed, thus control the intensity of emergent light.
Because the deflection of liquid crystal needs the regular hour, therefore, after adding voltage signal, reaching certain light output value needs the regular hour.General employing display " black-white-black ", namely the process of " high gray scale-low gray scale-high gray scale " defines the response time, and Fig. 1 is the brightness change curve of a liquid crystal display in " high gray scale-low gray scale-high gray scale " procedure for displaying.Rise time be defined as by 10% of brightness amplitude of variation rise to brightness amplitude of variation 90% needed for time, fall time for dropped to by 90% of brightness amplitude of variation brightness amplitude of variation 10% needed for time.Rise time and fall time sum be namely defined as the response time of liquid crystal display.
Response time is the important performance indexes weighing display gradation conversion speed.The speed of response time will directly affect the Dynamic Announce performance of liquid crystal display, and response time long meeting causes hangover, image blurring, the lower degradation of dynamic definition.
Conventional liquid crystal response Method Of Time Measurement is the brightness adopting photoelectric probe to gather LCDs, draws brightness response curve.Rise time and fall time can be measured from curve.From the rise time in brightness response curve one-period and fall time sum just can obtain the response time of liquid crystal display.But when measuring display brightness, because backlight adopts the mode of modulation to work usually, screen intensity is inevitably subject to the impact of back light source brightness change, the brightness response curve recorded is caused not to be a level and smooth curve.Error is produced when this can cause determining 10% brightness and 90% brightness.
Fig. 2 is the schematic diagram of conventional measurement liquid crystal display response time method.In figure, LMD is photodetector.Due to the modulation of backlight, result in and measure that to obtain brightness response curve be not level and smooth.The response curve that typical actual measurement obtains as shown in Figure 3.Fluctuation in brightness response curve adds the difficulty judging luminance threshold, thus causes measuring error.For this reason, people adopt filtering, the method such as level and smooth to the fluctuation problem of the response curve eliminated backlight modulation and cause usually, but different filtering or level and smooth method also can cause the error measuring the response time obtained.
Summary of the invention
In order to eliminate the error of the response time measurement caused due to the backlight modulation of liquid crystal display, the present invention proposes a kind of liquid crystal display response time measuring method based on reference brightness, the measuring accuracy of liquid crystal response time can be improved.
The embodiment of the present invention provides a kind of liquid crystal display response time measuring method based on reference brightness, comprising:
Liquid crystal display display test pattern, described resolution chart comprises the reference pattern district of two constant greyscale, the resolution chart district of a grey scale change and a background area;
The brightness along with time variations in two constant greyscale reference pattern districts described in brightness recording unit synchronous recording and the brightness along with time variations in a described grey scale change resolution chart district;
Denoising is carried out to three brightness change curves of described record, and draws the brightness curve in grey scale change resolution chart district;
With the brightness in the constant reference resolution chart district of described two gray scales for reference data, according to corresponding luminance threshold criterion, the brightness curve in described grey scale change resolution chart district obtains time corresponding to 10% and 90% brightness;
The time corresponding according to 10% and 90% brightness obtains rise time and fall time, calculates the response time of display, the described response time by the rise time and fall time sum obtain.
General liquid crystal response Method Of Time Measurement is the brightness adopting photoelectric probe to gather LCDs, draws brightness response curve.Can be by filtering, the signal processing method such as level and smooth, rough brightness curve is filtered into level and smooth brightness curve, thus directly determine 10% brightness and moment corresponding to 90% brightness; Also can be directly find out in rough rising edge first be greater than threshold luminance moment and when negative edge find out be less than threshold luminance when.The impact of the brightness fluctuation that above-mentioned measuring method is brought by backlight modulation easily.
Liquid crystal display response time measuring method based on reference brightness is the method for the brightness change by measuring zones of different on resolution chart in LCDs simultaneously, eliminates backlight modulation to the impact of measuring.The resolution chart arranged is made up of the constant reference diagram district of the test pattern district of a grey scale change, two gray scales and background area.By the brightness in synchronous recording resolution chart Zhong Liangge reference diagram district and the brightness in a variation diagram district, the brightness that just can obtain grey scale change resolution chart, in the process of backlight modulation, reaches the moment of reference brightness threshold value, thus accurately locates luminance threshold point.
Specifically, when we will test the response time from gray scale A to gray scale B, display test pattern first on a liquid crystal display.The resolution chart based on reference brightness that the present invention proposes as shown in Figure 4.
This resolution chart is made up of the constant reference pattern region of the region changed between gray scale A a to B, two gray scales and a background area.
In resolution chart, the region of grey scale change alternately switches between A to B two gray scales, need when being switched to a gray shade scale to keep a period of time, retention time generally should be greater than more than 2 times of the response time, otherwise just intactly can not measure brightness response curve.According to the difference arranging gray scale, the response time of different gray scale can be measured, as 0 to 255,0 to 127,127 to 255 etc.Background gray scale outside resolution chart is finally set.
The reference pattern that in resolution chart, two gray scales are constant, set brightness is 10% and 90% of brightness corresponding to grey scale change respectively.
L
10％＝L
A+(L
B-L
A)×10％
L
90％＝L
B-(L
B-L
A)×10％
Wherein L
10%the brightness of reference pattern 1, L
90%the brightness of reference pattern 2, L
athe brightness corresponding to gray scale A, L
bthe brightness corresponding to gray scale B.In formula, the brightness of gray scale A is lower than the brightness L of gray scale B
b.
Background area in resolution chart is generally set to one of 10% of the brightness change difference of brightness corresponding to grey scale change resolution chart district in the constant reference resolution chart district of described two gray scales with reference to below 50% gray scale in resolution chart district.For convenient test, black can be set to, i.e. 0 gray scale.
The shape of the test zone in resolution chart can be set to rectangle as required, or circular, oval, the shapes such as triangle, and the integral layout in each resolution chart region also can arrange arbitrarily according to the convenience of test.The principle arranged is that certain distance is left in each region, and the horizontal and vertical of resolution chart all at least will comprise 500 pixels, to ensure the stability measuring brightness.
Use the brightness change of three test zones in the measurement pattern of the surveying instrument synchro measure display can recording brightness change, record obtains three brightness response curve simultaneously.Testing tool can be the brightness register instrument that employing three photoelectricity test instrument or a high-speed camera etc. have synchro measure characteristic.In order to reduce the noise of test environment to brightness, denoising can be carried out to measuring the brightness response curve obtained.Denoising method can be the multiple spot moving average method in time domain, the low-pass filtering on frequency domain, the filtering methods such as Wavelet Denoising Method.
According to synchro measure principle, the fluctuation of three brightness response curve recorded is synchronous with backlight modulation, in time will finding out the luminance threshold of change brightness response curve, even if when backlight fluctuates, by the brightness curve in two other gray reference region, the moment corresponding to upper 10% and 90% brightness change of brightness response curve can be obtained exactly.Usually following criterion can be adopted: the moment that the difference of the brightness of the reference zone that (1) gray scale is constant and the brightness in grey scale change region is minimum; Or (2) change brightness is greater than the moment of reference brightness average first.The time corresponding to 10% and 90% brightness change adopting said method to obtain, effectively can eliminate the measuring error that backlight modulation is brought, thus improve the measuring accuracy of liquid crystal display response time.
Accompanying drawing explanation
The definition of Fig. 1 response time.
The liquid crystal display response time measuring method schematic diagram of Fig. 2 routine.
The brightness response curve that the typical actual measurement of Fig. 3 is arrived.
The resolution chart that Fig. 4 is proposed by the invention.
Fig. 5 gamma curve.
The brightness curve that Fig. 6 adopts photodetector measurement to obtain.
Fig. 7 is based on the liquid crystal response time synchronized measurement schematic diagram of high-speed camera.
The result of Fig. 8 high-speed camera synchro measure rise time.
The result of Fig. 9 high-speed camera synchro measure fall time.
Embodiment
In order to be illustrated more clearly in the liquid crystal display response time method for synchronously measuring based on reference brightness, below in conjunction with accompanying drawing, the invention will be further described.
The method of the liquid crystal display response time method for synchronously measuring of reference brightness is specific as follows:
(1) signal generator is first used to export resolution chart in liquid crystal display to be tested, the defeated resolution chart making liquid crystal display to be tested to show as shown in Figure 4.
This resolution chart is made up of the constant reference pattern region of the region changed between gray scale A a to B, two gray scales and Background (black region in figure).
In resolution chart, the region of grey scale change alternately switches between A to B two gray scales, need when being switched to a gray shade scale to keep a period of time, retention time generally should be greater than more than 2 times of the response time, otherwise just intactly can not measure brightness response curve.According to the difference arranging gray scale, the response time of different gray scale can be measured, as 0 to 255,0 to 127,127 to 255 etc.Background gray scale outside resolution chart is finally set.
The reference pattern that in resolution chart, two gray scales are constant, set brightness is 10% and 90% of brightness corresponding to grey scale change respectively.
L
10％＝L
A+(L
B-L
A)×10％
L
90％＝L
B-(L
B-L
A)×10％
Wherein L
10%the brightness of reference pattern 1, L
90%the brightness of reference pattern 2, L
athe brightness corresponding to gray scale A, L
bthe brightness corresponding to gray scale B.In formula, the brightness of gray scale A is lower than the brightness L of gray scale B
b.
When the brightness of resolution chart is set, to realize according to the gamma curve of display to be measured.As shown in Figure 5, it illustrates the relation of gray scale and brightness to a typical gamma curve, also can represent with following formula:
G＝a×(1+L)
b，
In formula, G is gray-scale value, and L is brightness value, and a, b are constants.
(2) adopt in brightness recording unit synchronous recording Fig. 4, the brightness change of three test zones in measurement pattern, record obtains three brightness curves simultaneously.
Wherein, brightness recording unit comprises photodetector or high-speed camera.In order to reduce the noise of test environment to brightness, denoising can be carried out to measuring the brightness response curve obtained.Denoising method can be the multiple spot moving average method in time domain, the low-pass filtering on frequency domain, the filtering methods such as Wavelet Denoising Method.
(3) in one-period, with the brightness in the constant reference resolution chart district of two gray scales for reference data, the intersection point of the brightness response curve corresponding to resolution chart district of two reference brightness curves and change is exactly 10% luminance threshold point and 90% luminance threshold point.Changing to 90% brightness from 10% brightness is rise time (T during this period of time
r); Changing to 10% brightness from 90% brightness is (T fall time during this period of time
f), by the rise time and fall time sum obtain the response time of display.
Utilize said method, the impact of backlight modulation can be eliminated, accurately locate luminance threshold point and draw the corresponding gray-tone response time.
Embodiment one
The present embodiment, by the brightness change using the PR-680L double light path spectral scan nitometer of PhotoResearch company of the U.S. to carry out collecting test figure, tests the response time of certain brand liquid crystal display X.
First on liquid crystal display X, show resolution chart as shown in Figure 4.
Use the brightness change in the test pattern district of a grey scale change in PR-680L synchro measure resolution chart and the constant reference diagram district of two gray scales, sampling rate is 20KHz, in order to reduce neighbourhood noise to the interference of measuring brightness, 5 methods of moving average are used to carry out denoising to the data collected.
Measurement result as shown in Figure 6.L1, L2, L3 are three curves in figure, L2 wherein, and L1 represents 10% respectively, the measurement brightness in 90% reference brightness district; L3 is the measurement brightness in grey scale change district.
In rising edge, the L2 sampled point of 10% brightness is minimum with the absolute value of corresponding L3 sampled point, be then judged to 10% luminance threshold point; The L2 sampled point of 90% brightness is minimum with the absolute value of corresponding L3 sampled point, be then judged to 90% luminance threshold point.
In negative edge, the L2 sampled point of 10% brightness is minimum with the absolute value of corresponding L3 sampled point, be then judged to 10% luminance threshold point; The L2 sampled point of 90% brightness is minimum with the absolute value of corresponding L3 sampled point, be then judged to 90% luminance threshold point.
Rise time 17.91ms can be obtained from above-mentioned figure; Fall time 0.65ms, so response time 18.56ms of liquid crystal display X.
Can see from the measurement result of Fig. 6, due to the modulation of backlight, there is synchronous fluctuating in the brightness of 10% and 90% correspondence, and the brightness that grey scale change resolution chart is corresponding also can occur waviness under the modulation of backlight.Due to the synchronism measured, when judging luminance threshold, the present invention just can eliminate the erroneous judgement that waviness causes effectively, improves measuring accuracy.
Embodiment two
This gives the implementation using high-speed camera to measure the response time.
Adopt the schematic diagram of high-speed camera measurement as shown in Figure 7.High-speed camera used is the M310 high-speed camera of VisionResearch company of the U.S..
First on certain brand liquid crystal display Y, show resolution chart as shown in Figure 4.Taken by high-speed camera and record resolution chart corresponding pixel points brightness change.In order to reduce the interference of environment to CCD imaging, Gassian low-pass filter method is used to carry out denoising to shooting image.
At same imaging moment, calculate the gray average of three resolution charts in the image photographed respectively.In one-period, calculate the resolution chart gray average of change and the departure with reference to resolution chart district 1 gray average, one frame of minimum deflection amount is judged to 10% luminance threshold frame, now survey change figure brightness be in same grade with reference to the brightness in resolution chart district 1; In like manner, calculate the resolution chart gray average of change and the departure with reference to resolution chart district 2 gray average, a frame of minimum deflection amount is judged to 90% luminance threshold frame.
According to above-mentioned criterion, we obtain in rising edge, and it is from the 9th frame to the 12nd frame that 10% brightness changes to 90% brightness, experienced by 3 frames, as shown in Figure 8.Be that 600 frames are per second according to the shooting speed of high speed camera, can calculate the rise time is 3/600=5ms.Equally, in negative edge, 10% brightness changes to 90% brightness and experienced by 4 frames, as shown in Figure 9.Be that 600 frames are per second according to the shooting speed of high speed camera, can calculate fall time is 4/600=6.67ms.Therefore, the response time of the liquid crystal display Y using the synchro measure of high-speed camera to obtain is 11.69ms.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (5)
1., based on a liquid crystal display response time measuring method for reference brightness, it is characterized in that, comprising:
A) liquid crystal display display test pattern, described resolution chart comprises the reference pattern district of two constant greyscale, the resolution chart district of a grey scale change and a background area; The brightness set by reference pattern district that in described resolution chart, two gray scales are constant is 10% and 90% of the brightness change difference corresponding to grey scale change resolution chart district respectively;
B) brightness along with time variations in two constant greyscale reference pattern districts described in brightness recording unit synchronous recording and the brightness along with time variations in a described grey scale change resolution chart district;
C) denoising is carried out to three brightness change curves of described record, and draw the brightness curve in grey scale change resolution chart district;
D) with the brightness in the constant reference resolution chart district of described two gray scales for reference data, according to corresponding luminance threshold criterion, the brightness curve in described grey scale change resolution chart district obtains time corresponding to 10% and 90% brightness;
E) corresponding according to the 10% and 90% brightness time obtains rise time and fall time, calculates the response time of display, the described response time by the rise time and fall time sum obtain.
2. method according to claim 1, it is characterized in that, in described resolution chart, the gray scale in the resolution chart district of grey scale change alternately switches between two gray scales in the reference pattern district of described two constant greyscale, the gray scale in the resolution chart district of described grey scale change keeps a period of time when being switched to a gray shade scale, and the retention time is greater than 2 times of response time.
3. method according to claim 1, it is characterized in that, Background in described resolution chart is set to one of 10% of the brightness change difference of brightness corresponding to grey scale change resolution chart district in the constant reference resolution chart district of described two gray scales with reference to below 50% gray scale in resolution chart district, and the gray-scale value in the resolution chart district of described grey scale change is 0-255.
4. method according to claim 3, is characterized in that, described brightness recording unit comprises photodetector or high-speed camera.
5. the method according to any one of claim 1-4, it is characterized in that, after the brightness along with time variations in two constant greyscale reference pattern districts described in described synchronous recording and the brightness along with time variations in a described grey scale change resolution chart district, also comprise: denoising is carried out to the brightness variable signal of record.
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| CN109003569B (en) * | 2018-07-16 | 2022-03-11 | 广州视源电子科技股份有限公司 | Method, device and equipment for determining tail time of display equipment and storage medium |
| CN110716530A (en) * | 2019-10-11 | 2020-01-21 | 山东中实易通集团有限公司 | DCS response time testing device and method |
| CN111402769B (en) * | 2020-04-14 | 2023-05-02 | 深圳市华星光电半导体显示技术有限公司 | Method for judging response speed of display panel |
| CN114114725A (en) * | 2020-08-28 | 2022-03-01 | 深圳莱宝高科技股份有限公司 | Method for testing LCM response time and related equipment |
| CN114627826A (en) * | 2022-03-15 | 2022-06-14 | 北京显芯科技有限公司 | Backlight control method, apparatus, device, storage medium and program product |
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