CN112614453A - Method and device for diagnosing response time abnormity of liquid crystal display panel - Google Patents
Method and device for diagnosing response time abnormity of liquid crystal display panel Download PDFInfo
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
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Abstract
The invention provides a method for diagnosing abnormal response time of a liquid crystal display panel, which is applied to the condition that the response time is not suitable for reducing by adopting an overdrive technology when an initial gray scale is switched into a target gray scale. The invention also provides a device for diagnosing the response time abnormity of the liquid crystal display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method and a device for diagnosing response time abnormity of a liquid crystal display panel.
Background
At present, an overdrive technique is usually adopted to adjust the driving voltage of the liquid crystal in the liquid crystal display panel, so as to reduce the response time of the liquid crystal display panel and solve the problems of wadding of display images, residual images and the like. However, the overdrive technique is only applicable to the case of switching the current gray level to the intermediate gray level, and is not applicable to the case of switching the current gray level to the end gray level. For example, for a liquid crystal display panel with a gray scale value range of 0 to 255, if the gray scale x is switched to the gray scale y (x ≠ y) of the gray scales 1 to 254, the response time of the liquid crystal display panel can be reduced by using the overdrive technique, and if the gray scale x is switched to the gray scale y (x ≠ y) of the gray scales 0 and 255, the purpose of reducing the response time of the liquid crystal display panel cannot be achieved by using the overdrive technique, thereby causing the response time of the liquid crystal display panel to be abnormal.
Therefore, it is urgently needed to provide a new method for diagnosing the response time abnormality of the liquid crystal display panel, which is applied to the case of switching the current gray scale to the endpoint gray scale to determine the cause of the response time abnormality of the liquid crystal display panel, and further reduce the response time of the liquid crystal display panel by adopting an appropriate method according to the cause.
Disclosure of Invention
Therefore, it is necessary to provide a method and an apparatus for diagnosing an abnormal response time of a liquid crystal display panel, so as to solve the technical problem that the prior art cannot determine the reason for the abnormal response time of the liquid crystal display panel and further cannot reduce the response time of the liquid crystal display panel when the current gray scale needs to be switched to the endpoint gray scale.
In a first aspect, the present invention provides a method for diagnosing response time abnormality of a liquid crystal display panel, where the method for diagnosing response time abnormality of a liquid crystal display panel includes the following steps:
determining a plurality of gray scale switching groups according to the gray scale interval of the liquid crystal display panel; each gray scale switching group comprises an initial gray scale and a target gray scale which are mutually unequal, and the target gray scale is an endpoint gray scale of the gray scale interval;
determining a gray scale switching group to be tested which needs to be subjected to abnormal diagnosis in a plurality of gray scale switching groups according to the first response time of the initial gray scale of the gray scale switching group when the initial gray scale is switched to the target gray scale;
performing low-pass filtering on a first response time waveform corresponding to the first response time of the gray scale switching group to be detected to obtain a second response time waveform and a second response time of the gray scale switching group to be detected;
when the second response time of the gray scale switching group to be detected is shorter than the corresponding first response time, improving the backlight brightness of the liquid crystal display panel, and switching the initial gray scale of the gray scale switching group to be detected into the target gray scale after improving the backlight brightness to obtain a third response time waveform and a third response time of the gray scale switching group to be detected;
if the third response time of the gray scale switching group to be detected is less than the corresponding first response time, determining that the reason of the abnormal response time is related to the backlight brightness; and if the second response time of the to-be-detected gray scale switching group is greater than or equal to the corresponding first response time, or the third response time of the to-be-detected gray scale switching group is greater than or equal to the corresponding first response time, determining that the reason of the abnormal response time is related to the manufacturing process of the liquid crystal display panel.
In some embodiments, the step of determining a plurality of gray scale switching groups according to the gray scale interval of the liquid crystal display panel specifically includes:
selecting two end point gray scales and a plurality of intermediate gray scales between the two end point gray scales from the gray scale interval according to a gray scale selection rule, and defining the two end point gray scales and the intermediate gray scales as test gray scales;
and combining the test gray scales to form a plurality of gray scale switching groups, wherein each gray scale switching group comprises any one test gray scale as the initial gray scale and one endpoint gray scale which is not equal to the test gray scale as the target gray scale.
In some embodiments, the step of determining, as the gray scale switching group to be tested, which needs to be subjected to the abnormality diagnosis in the plurality of gray scale switching groups according to the first response time of the initial gray scale of the gray scale switching group when the gray scale switching group is switched to the target gray scale includes:
switching the initial gray scales of all the gray scale switching groups to the target gray scales to obtain a plurality of first response time waveforms and a plurality of first response time waveforms;
determining the first response time for which an anomaly exists among a number of the first response times;
and determining the gray scale switching group corresponding to the abnormal first response time as the gray scale switching group to be detected.
In some embodiments, in the step of "switching the initial grayscales of all the grayscale switching groups to the target grayscales to obtain a plurality of first response times and a plurality of first response time waveforms", abscissa and ordinate of the first response time waveform are time and grayscale, respectively, and the first response time is defined as a corresponding time period in a response time calculation rule of a grayscale section from the initial grayscale to the target grayscale in the corresponding first response time waveform.
In some embodiments, the step of "determining the first response time with an anomaly among a plurality of the first response times" specifically includes:
defining a preset time threshold, and determining the gray scale switching group corresponding to the first response time larger than the preset time threshold as a prepared gray scale switching group in a plurality of first response times;
determining the number of the preparation gray scale switching groups, if the number is equal to 1, using the preparation gray scale switching groups as the to-be-detected gray scale switching groups, if the number is greater than 1, calculating the gray scale difference between the initial gray scale and the target gray scale in each preparation gray scale switching group, and using the preparation gray scale switching group corresponding to the gray scale difference with the minimum value as the to-be-detected gray scale switching group.
In some embodiments, the step of performing low-pass filtering on a first response time waveform corresponding to the first response time of the to-be-detected gray scale switching group to obtain a second response time waveform and a second response time of the to-be-detected gray scale switching group specifically includes:
defining a cut-off frequency, and filtering out frequency components higher than the cut-off frequency in the first response time waveform of the to-be-detected gray scale switching group through low-pass filtering to obtain a second response time waveform of the to-be-detected gray scale switching group, wherein the abscissa and the ordinate of the second response time waveform are time and gray scale respectively, and the second response time is defined as a time period corresponding to a gray scale section from the initial gray scale to the target gray scale in the corresponding second response time waveform in the response time calculation rule.
In some embodiments, in the step of "switching the initial gray scale of the to-be-tested gray scale switching group to the target gray scale after the backlight brightness is increased to obtain a third response time waveform and a third response time of the to-be-tested gray scale switching group", an abscissa and an ordinate of the third response time waveform are respectively time and gray scale, and the third response time is defined as a time period corresponding to a gray scale section from the initial gray scale to the target gray scale in the response time calculation rule in the corresponding third response time waveform.
In some embodiments, the cut-off frequency is in the range of 200-2000 Hz.
In some embodiments, the step of "increasing the backlight brightness of the liquid crystal display panel" specifically includes:
and the backlight brightness of the liquid crystal display panel is improved to be more than 300 nits.
In a second aspect, the present invention provides a diagnosis device for response time abnormality of a liquid crystal display panel, where the diagnosis device for response time abnormality of a liquid crystal display panel includes a memory, a processor, a gray scale switching group determination module, a to-be-detected gray scale switching group determination module, a filtering module, a brightness improvement module, and a diagnosis module; the memory is coupled to the processor for storing a plurality of instructions executable by the processor, the plurality of instructions comprising:
controlling the gray scale switching group determining module to determine a plurality of gray scale switching groups according to the gray scale interval of the liquid crystal display panel; each gray scale switching group comprises an initial gray scale and a target gray scale which are mutually unequal, and the target gray scale is an endpoint gray scale of the gray scale interval;
controlling the to-be-detected gray scale switching group determining module to determine a gray scale switching group to be detected, which needs to be subjected to abnormal diagnosis, in a plurality of gray scale switching groups according to first response time of the initial gray scale of the gray scale switching group when the initial gray scale is switched to the target gray scale;
controlling the filtering module to perform low-pass filtering on a first response time waveform corresponding to the first response time of the gray scale switching group to be detected to obtain a second response time waveform and a second response time of the gray scale switching group to be detected;
controlling the brightness improving module to improve the backlight brightness of the liquid crystal display panel when the second response time of the gray scale switching group to be tested is shorter than the corresponding first response time, and switching the initial gray scale of the gray scale switching group to be tested into the target gray scale after improving the backlight brightness to obtain a third response time waveform and a third response time of the gray scale switching group to be tested;
controlling the diagnosis module to determine that the reason of abnormal response time is related to the backlight brightness under the condition that the third response time of the gray scale switching group to be detected is shorter than the corresponding first response time; and determining that the reason of the abnormal response time is related to the manufacturing process of the liquid crystal display panel under the condition that the second response time of the gray scale switching group to be detected is greater than or equal to the corresponding first response time or the third response time of the gray scale switching group to be detected is greater than or equal to the corresponding first response time.
The method and the device for diagnosing the abnormal response time of the liquid crystal display panel are applied to the condition that the response time is not suitable for being reduced by adopting an overdrive technology when the initial gray scale is switched into the target gray scale.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for diagnosing an abnormal response time of a liquid crystal display panel according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating the calculation of the response time according to the embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a device for diagnosing response time abnormality of a liquid crystal display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The Rtings evaluating mechanism is a mechanism for evaluating the performance of the liquid crystal display panel, has specific requirements on the response time of the liquid crystal display panel, and the liquid crystal display panel with lower response time is evaluated with higher score, so that the Rtings evaluating mechanism is an important reference for consumers to select the liquid crystal display panel. In order to enable the liquid crystal display panel produced by the liquid crystal display panel manufacturer to obtain high-grade evaluation in response time evaluation of the Rtings evaluation mechanism, the response time test is carried out in the design process of the liquid crystal display panel, so that the liquid crystal display panel can be produced in batches or be improved continuously according to the test result.
In the process of the response time test, for the condition that the liquid crystal display panel switches the current gray scale to the intermediate gray scale, the response time of the liquid crystal display panel can be reduced by using an overdrive technology. It should be noted that the intermediate gray scale refers to a gray scale except for the end gray scale in the gray scale interval of the liquid crystal display panel, the current gray scale refers to a gray scale which is located in the gray scale interval and is not equal to the intermediate gray scale, and the gray scale interval refers to a value range of the gray scale of the liquid crystal display panel.
And for the condition that the current gray scale of the liquid crystal display panel is switched to the endpoint gray scale, the response time of the liquid crystal display panel cannot be reduced by using an overdrive technology, so that the response time of the liquid crystal display panel is abnormal, the problems of wadding, residual shadows and the like of a display picture occur, and the liquid crystal display panel is further subjected to low-grade evaluation in the evaluation of the Rtings evaluation mechanism for the response time.
In order to solve the above technical problem, an embodiment of the present invention provides a method for diagnosing an abnormal response time of a liquid crystal display panel when a current gray scale is switched to an end gray scale, so as to determine a cause of the abnormal response time of the liquid crystal display panel, and further reduce the response time of the liquid crystal display panel by using an appropriate method according to the cause.
Referring to fig. 1, the method for diagnosing response time abnormality of the liquid crystal display panel includes the following steps:
step S1, determining a plurality of gray scale switching groups according to the gray scale interval of the liquid crystal display panel. Each gray scale switching group comprises an initial gray scale and a target gray scale which are not equal to each other, and the target gray scale is an endpoint gray scale of a gray scale interval.
Specifically, the gray scale interval refers to a range of gray scales of the liquid crystal display panel. For example, for a liquid crystal display panel with a color depth of 8 bits, the gray scale interval is 0-255. In the embodiments of the present invention and the following embodiments, the liquid crystal display panel is exemplified as a liquid crystal display panel having a color depth of 8 bit.
And determining a plurality of gray scale switching groups according to the gray scale interval of the liquid crystal display panel, wherein each gray scale switching group comprises an initial gray scale and a target gray scale. The target gray scale is an endpoint gray scale of the gray scale interval, namely, the minimum gray scale 0 or the maximum gray scale 255 in the gray scale interval; the initial gray scale is located in the gray scale interval and is not equal to the target gray scale, for example, if the target gray scale is 0, the initial gray scale may be any one of gray scales 1-255, and if the target gray scale is 255, the initial gray scale may be any one of gray scales 0-254.
Preferably, the number of gray-scale switch groups is six, and the six gray-scale switch groups are (51,0), (204,0), (255,0), (0,255), (51,255) and (204,255), respectively. Wherein, the initial gray scales in the first three gray scale switching groups are respectively 51, 204 and 255, and the target gray scales are all 0; the initial gray levels in the last three gray level switching groups are respectively 0, 51 and 204, and the target gray levels are all 255.
Step S2, determining, from the gray scale switch groups, a gray scale switch group to be tested that needs to be subjected to an abnormality diagnosis according to a first response time of the initial gray scale of the gray scale switch group when the initial gray scale is switched to the target gray scale.
Specifically, the initial gray scales of all gray scale switching groups are switched to the target gray scales to obtain a plurality of first response times and a plurality of first response time waveforms. For the six gray scale switching groups, the initial gray scale in each gray scale switching group is switched to the target gray scale to obtain a response time waveform corresponding to each gray scale switching group, and the response time waveform is called as a first response time waveform. And acquiring the response time corresponding to each gray scale switching group according to the first response time waveform corresponding to each gray scale switching group, wherein the response time is called as first response time.
Then, a first response time in which an abnormality exists among the number of first response times is determined. For the six gray scale switching groups, six first response time waveforms and six first response times corresponding to the six gray scale switching groups respectively can be obtained. And determining the abnormal first response time in the six first response times, and taking the gray scale switching group corresponding to the abnormal first response time as the gray scale switching group to be detected. It should be noted that the abnormal first response time may be any one of the six first response times that is greater than the preset threshold, or may be the largest one of the six first response times, and may also be selected according to other selection rules, which is not specifically limited in this embodiment of the present invention.
And finally, determining the gray scale switching group corresponding to the abnormal first response time as the gray scale switching group to be detected.
Step S3, performing low-pass filtering on the first response time waveform corresponding to the first response time of the to-be-detected gray-scale switching group to obtain a second response time waveform and a second response time of the to-be-detected gray-scale switching group.
Specifically, low-pass filtering is performed on a first response time waveform corresponding to the gray scale switching group to be detected to filter out frequency components higher than a cut-off frequency, so that a second response time waveform corresponding to the gray scale switching group to be detected is obtained. And acquiring corresponding response time according to the second response time waveform, wherein the response time is called as second response time.
Step S4, when the second response time of the to-be-detected gray scale switching group is shorter than the corresponding first response time, increasing the backlight brightness of the liquid crystal display panel, and switching the initial gray scale of the to-be-detected gray scale switching group to the target gray scale after increasing the backlight brightness, to obtain a third response time waveform and a third response time of the to-be-detected gray scale switching group.
Specifically, after the backlight brightness of the liquid crystal display panel is improved, the initial gray scale in the gray scale switching group to be tested is switched to the target gray scale, so as to obtain a response time waveform corresponding to the gray scale switching group to be tested, and the response time waveform is called as a third response time waveform. And acquiring a corresponding response time according to the third response time waveform, and calling the response time as a third response time.
Step S5, if the third response time of the gray scale switching group to be tested is shorter than the corresponding first response time, determining that the reason of the abnormal response time is related to the backlight brightness; and if the second response time of the gray scale switching group to be detected is greater than or equal to the corresponding first response time, or the third response time of the gray scale switching group to be detected is greater than or equal to the corresponding first response time, determining that the reason of the abnormal response time is related to the manufacturing process of the liquid crystal display panel.
Specifically, if the third response time corresponding to the gray scale switching group to be tested is shorter than the first response time corresponding to the gray scale switching group to be tested, it is proved that the waveform noise is caused by low backlight brightness, that is, the reason for the abnormal response time of the liquid crystal display panel is related to the backlight brightness, and the response time of the liquid crystal display panel can be reduced by increasing the backlight brightness.
And if the second response time is not less than the first response time corresponding to the gray scale switching group to be detected, or the third response time is not less than the first response time corresponding to the gray scale switching group to be detected, determining that the reason of the abnormal response time of the liquid crystal display panel is related to the manufacturing process of the liquid crystal display panel. If the reason for the abnormal response time of the liquid crystal display panel is related to the manufacturing process of the liquid crystal display panel, the liquid crystal box thickness and/or the liquid crystal pretilt angle of the liquid crystal display panel are/is reduced, and the response time of the liquid crystal display panel is further reduced.
The method for diagnosing the response time abnormity of the liquid crystal display panel is applied to the condition that the response time is not suitable for being reduced by adopting an overdrive technology when the initial gray scale is switched into the target gray scale.
Further, the step of determining a plurality of gray scale switching groups according to the gray scale interval of the liquid crystal display panel specifically comprises:
according to a gray scale selection rule, two end point gray scales and a plurality of intermediate gray scales between the two end point gray scales are selected from a gray scale interval, and the two end point gray scales and the intermediate gray scales are defined as test gray scales.
Specifically, the gray scale selection rule in the embodiment of the invention refers to the gray scale selection rule in the response time evaluation of the Rtings evaluation mechanism, that is, the minimum gray scale, the maximum gray scale and two intermediate gray scales between the minimum gray scale and the maximum gray scale in the gray scale interval are selected, and each selected gray scale is used as a test gray scale to obtain a plurality of test gray scales. It should be noted that one of the two intermediate gray levels is obtained by multiplying the maximum gray level by 20%, and the other is obtained by multiplying the maximum gray level by 80%.
For example, for the liquid crystal display panel with the color depth of 8bit, the four selected test gray levels are 0, 51, 204 and 255 respectively. Where 0 and 255 are end gray levels and 51 and 204 are intermediate gray levels.
The test gray scales are combined to form a plurality of gray scale switching groups, wherein each gray scale switching group comprises any one test gray scale as an initial gray scale and an endpoint gray scale which is not equal to the test gray scale as a target gray scale.
Specifically, for the liquid crystal display panel with the color depth of 8 bits, the test gray scales of the gray scale switching groups formed by the end point gray scale 0 and the end point gray scale are 51, 204 and 255 respectively, and correspondingly, the gray scale switching groups are (51,0), (204,0) and (255,0) respectively, wherein the initial gray scales are 51, 204 and 255 respectively, and the target gray scales are 0 respectively. The test gray levels of the gray level switching groups formed with the end point gray level 255 are respectively 0, 51 and 204, and correspondingly, the gray level switching groups are respectively (51,0), (204,0) and (255,0), wherein the initial gray levels are respectively 0, 51 and 204, and the target gray levels are all 255.
Further, the step of determining a gray scale switching group to be tested which needs to be subjected to abnormality diagnosis in the plurality of gray scale switching groups according to the first response time of the initial gray scale of the gray scale switching group when the initial gray scale is switched to the target gray scale includes:
and switching the initial gray scales of all the gray scale switching groups to the target gray scale to obtain a plurality of first response times and a plurality of first response time waveforms.
A first response time is determined for which an anomaly exists among the number of first response times.
And determining the gray scale switching group corresponding to the abnormal first response time as the gray scale switching group to be detected.
Further, in the step of switching the initial gray scales of all the gray scale switching groups to the target gray scales to obtain a plurality of first response times and a plurality of first response time waveforms, the abscissa and the ordinate of the first response time waveform are time and gray scales respectively, and the first response time is defined as a time period corresponding to a gray scale section from the initial gray scale to the target gray scale in the corresponding first response time waveform in the response time calculation rule.
Specifically, the response time calculation rule in the embodiment of the present invention refers to the response time calculation rule in the evaluation of the response time by the Rtings evaluation mechanism, that is, the NA80 rule and the NA100 rule. If the NA80 rule is adopted for switching the gray level x to the gray level y, please refer to fig. 2, the gray level segment G1 from the gray level x to the gray level x + 80% × (y-x) is intercepted in the first response time waveform, and the time period corresponding to the gray level segment G1, i.e. the time period T1 from the time corresponding to the gray level x to the time corresponding to the gray level x + 80% × (y-x), is taken as the first response time. If the NA100 rule is adopted, please refer to fig. 2, the gray segment G2 between the gray level x and the gray level y is captured in the first response time waveform, and the time period corresponding to the gray segment, i.e. the time period T2 between the time corresponding to the gray level x and the time corresponding to the gray level y, is taken as the first response time.
Further, the step of "determining the abnormal first response time among the plurality of first response times" specifically includes:
defining a preset time threshold, and determining the corresponding gray scale switching group with the first response time larger than the preset time threshold as a prepared gray scale switching group in the plurality of first response times.
Specifically, the preset threshold may be empirically selected, and embodiments of the present invention are not particularly limited in this respect. Table 1 shows a response time table of a liquid crystal display panel having a color depth of 8bit according to the NA80 rule.
TABLE 1 response time table for liquid crystal display panel with color depth of 8bit under NA80 rule
As shown in table 1, the six first response times corresponding to the six gray-scale switching groups (51,0), (204,0), (255,0), (0,255), (51,255) and (204,255) are respectively: 39ms, 8ms, 10ms, 11ms, 9ms and 2 ms. If the preset threshold is 20ms, the gray scale switch group with the first response time greater than the preset threshold is (51,0), and the gray scale switch group is defined as a preliminary gray scale switch group.
Table 2 shows the response time table of the liquid crystal display panel with color depth of 8bit according to the NA100 rule.
TABLE 2 response time table for LCD panel with color depth of 8bit under NA100 rule
As shown in table 2, the six first response times corresponding to the six gray-scale switching groups (51,0), (204,0), (255,0), (0,255), (51,255) and (204,255) are respectively: 39ms, 9ms, 11ms, 27ms, 17ms and 4 ms. If the preset threshold is 20ms, two gray scale switch groups with the first response time larger than the preset threshold are provided, the two gray scale switch groups are (51,0) and (0,255), respectively, and the two gray scale switch groups are defined as the preparation gray scale switch groups.
And determining the number of the prepared gray scale switching groups, if the number is equal to 1, using the prepared gray scale switching groups as the gray scale switching groups to be detected, if the number is greater than 1, calculating the gray scale difference between the initial gray scale and the target gray scale in each prepared gray scale switching group, and using the prepared gray scale switching group corresponding to the gray scale difference with the minimum value as the gray scale switching group to be detected.
Specifically, for table 1, since there is only one preliminary gray-scale switch group, if the NA80 rule is adopted, the gray-scale switch group is regarded as the gray-scale switch group to be tested.
In table 2, since there are only two preliminary gray scale switching groups, in the two preliminary gray scale switching groups, the difference between the initial gray scale 51 and the target gray scale 0 in the preliminary gray scale switching group (51,0) is 51 and is smaller than the difference 255 between the initial gray scale 0 and the target gray scale 255 in the preliminary gray scale switching group (0,255), and therefore, if the NA100 rule is adopted, the preliminary gray scale switching group (51,0) is used as the gray scale switching group to be tested.
Further, the step of performing low-pass filtering on the first response time waveform corresponding to the first response time of the to-be-detected gray scale switching group to obtain the second response time waveform and the second response time of the to-be-detected gray scale switching group specifically includes:
defining a cut-off frequency, and filtering frequency components higher than the cut-off frequency in a first response time waveform of the gray scale switching group to be detected through low-pass filtering to obtain a second response time waveform of the gray scale switching group to be detected, wherein the abscissa and the ordinate of the second response time waveform are respectively time and gray scale, and the second response time is defined as a corresponding time period of a gray scale section from an initial gray scale to a target gray scale in the corresponding second response time waveform in a response time calculation rule.
Specifically, the range of the cut-off frequency is usually 200-2000Hz, and preferably 1000 Hz. For example, if the cut-off frequency is 1000Hz, frequency components larger than 1000Hz in the first response time waveform corresponding to the gray scale switching group to be detected are filtered out, and a second response time waveform corresponding to the gray scale switching group to be detected is obtained.
The response time calculation rule in the embodiment of the present invention is the same as the response time calculation rule for calculating the first response time in the above-described embodiment, that is, if the N80 rule is adopted to calculate the first response time, the NA80 rule is also adopted here to calculate the second response time, and if the N100 rule is adopted to calculate the first response time, the NA100 rule is also adopted here to calculate the second response time. For a specific calculation process, please refer to the process of calculating the first response time in the above embodiment, which is not described herein again.
Further, in the step of switching the initial gray scale of the gray scale switching group to be detected to the target gray scale after the backlight brightness is increased to obtain a third response time waveform and a third response time of the gray scale switching group to be detected, the abscissa and the ordinate of the third response time waveform are respectively time and gray scale, and the third response time is defined as a time period corresponding to a gray scale section from the initial gray scale to the target gray scale in the corresponding third response time waveform in the response time calculation rule.
Specifically, since the transmittance of the back plate is different for different liquid crystal display panels, the backlight brightness needs to be adjusted to be higher, and usually the backlight brightness is adjusted to be more than 300 nits.
The response time calculation rule in the embodiment of the present invention is the same as the response time calculation rule for calculating the first response time in the above-described embodiment, that is, if the N80 rule is adopted to calculate the first response time, the NA80 rule is also adopted here to calculate the third response time, and if the N100 rule is adopted to calculate the first response time, the NA100 rule is also adopted here to calculate the third response time. For a specific calculation process, please refer to the process of calculating the first response time in the above embodiment, which is not described herein again.
Referring to fig. 3, the apparatus for diagnosing response time abnormality of a liquid crystal display panel in an embodiment of the present invention further includes a memory 301, a processor 302, a gray scale switching group determining module 303, a to-be-tested gray scale switching group determining module 304, a filtering module 305, a brightness improving module 306, and a diagnosing module 307; the memory 301 is coupled to the processor 302 to store instructions executable by the processor 302, the instructions including:
the control gray scale switching group determining module 303 determines a plurality of gray scale switching groups according to the gray scale interval of the liquid crystal display panel. Each gray scale switching group comprises an initial gray scale and a target gray scale which are not equal to each other, and the target gray scale is an endpoint gray scale of a gray scale interval.
The module 304 for determining gray scale switching groups to be tested determines the gray scale switching groups to be tested which need to be subjected to abnormality diagnosis in the plurality of gray scale switching groups according to the first response time of the initial gray scale of the gray scale switching groups when the initial gray scale is switched to the target gray scale.
The control filtering module 305 performs low-pass filtering on a first response time waveform corresponding to the first response time of the to-be-detected gray scale switching group to obtain a second response time waveform and a second response time of the to-be-detected gray scale switching group.
The brightness control increasing module 306 increases the backlight brightness of the liquid crystal display panel when the second response time of the to-be-detected gray scale switching group is shorter than the corresponding first response time, and switches the initial gray scale of the to-be-detected gray scale switching group to the target gray scale after the backlight brightness is increased, so as to obtain a third response time waveform and a third response time of the to-be-detected gray scale switching group.
The control diagnosis module 307 determines that the reason of the abnormal response time is related to the backlight brightness under the condition that the third response time of the gray scale switching group to be detected is shorter than the corresponding first response time; and determining the reason of the abnormal response time to be related to the manufacture procedure of the liquid crystal display panel under the condition that the second response time of the gray scale switching group to be detected is greater than or equal to the corresponding first response time or the third response time of the gray scale switching group to be detected is greater than or equal to the corresponding first response time.
In particular, the memory 301 may be used to store software programs and modules, which mainly include a program storage area and a data storage area. The processor 302 performs various functions and processes data by running or executing software programs and/or modules stored in the memory 301 and calling data stored in the memory 301, thereby performing overall monitoring.
The apparatus for diagnosing abnormal response time of a liquid crystal display panel according to an embodiment of the present invention specifically executes the processes of the above method embodiments, and details of the above method embodiments are specifically referred to, and are not repeated herein. The method and the device provided by the embodiment of the invention are applied to the condition that the response time is not suitable for reducing by adopting an overdrive technology when the initial gray scale is switched into the target gray scale, the method and the device improve the backlight brightness of the liquid crystal display panel by acquiring the response time waveform corresponding to the gray scale switching group to be detected and carrying out low-pass filtering on the response time waveform, when the response time corresponding to the filtered response time waveform is smaller than the response time corresponding to the time waveform before filtering, obtain the response time corresponding to the gray scale switching group to be detected again after the backlight brightness is improved, judge the reason of the abnormal response time according to the comparison of the front response time and the back response time, and further reduce the response time of the liquid crystal display panel by adopting a proper method according to the.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for diagnosing the response time abnormity of the liquid crystal display panel is characterized by comprising the following steps of:
determining a plurality of gray scale switching groups according to the gray scale interval of the liquid crystal display panel; each gray scale switching group comprises an initial gray scale and a target gray scale which are mutually unequal, and the target gray scale is an endpoint gray scale of the gray scale interval;
determining a gray scale switching group to be tested which needs to be subjected to abnormal diagnosis in a plurality of gray scale switching groups according to the first response time of the initial gray scale of the gray scale switching group when the initial gray scale is switched to the target gray scale;
performing low-pass filtering on a first response time waveform corresponding to the first response time of the gray scale switching group to be detected to obtain a second response time waveform and a second response time of the gray scale switching group to be detected;
when the second response time of the gray scale switching group to be detected is shorter than the corresponding first response time, improving the backlight brightness of the liquid crystal display panel, and switching the initial gray scale of the gray scale switching group to be detected into the target gray scale after improving the backlight brightness to obtain a third response time waveform and a third response time of the gray scale switching group to be detected;
if the third response time of the gray scale switching group to be detected is less than the corresponding first response time, determining that the reason of the abnormal response time is related to the backlight brightness; and if the second response time of the to-be-detected gray scale switching group is greater than or equal to the corresponding first response time, or the third response time of the to-be-detected gray scale switching group is greater than or equal to the corresponding first response time, determining that the reason of the abnormal response time is related to the manufacturing process of the liquid crystal display panel.
2. The method as claimed in claim 1, wherein the step of determining gray scale switching groups according to gray scale intervals of the liquid crystal display panel comprises:
selecting two end point gray scales and a plurality of intermediate gray scales between the two end point gray scales from the gray scale interval according to a gray scale selection rule, and defining the two end point gray scales and the intermediate gray scales as test gray scales;
and combining the test gray scales to form a plurality of gray scale switching groups, wherein each gray scale switching group comprises any one test gray scale as the initial gray scale and one endpoint gray scale which is not equal to the test gray scale as the target gray scale.
3. The method as claimed in claim 1, wherein the step of determining a gray scale switch group to be tested among the plurality of gray scale switch groups for which an abnormality diagnosis is required according to the first response time of the initial gray scale of the gray scale switch group when switching to the target gray scale comprises:
switching the initial gray scales of all the gray scale switching groups to the target gray scales to obtain a plurality of first response time waveforms and a plurality of first response time waveforms;
determining the first response time for which an anomaly exists among a number of the first response times;
and determining the gray scale switching group corresponding to the abnormal first response time as the gray scale switching group to be detected.
4. The method according to claim 3, wherein in the step of switching the initial gray scales of all the gray scale switching groups to the target gray scales to obtain a plurality of first response times and a plurality of first response time waveforms, the abscissa and the ordinate of the first response time waveform are time and gray scale respectively, and the first response time is defined as a time period corresponding to a gray scale section from the initial gray scale to the target gray scale in the corresponding first response time waveform in the response time calculation rule.
5. The method for diagnosing an abnormality in response time of a liquid crystal display panel according to claim 3, wherein the step of determining the first response time in which an abnormality exists among the plurality of first response times specifically includes:
defining a preset time threshold, and determining the gray scale switching group corresponding to the first response time larger than the preset time threshold as a prepared gray scale switching group in a plurality of first response times;
determining the number of the preparation gray scale switching groups, if the number is equal to 1, using the preparation gray scale switching groups as the to-be-detected gray scale switching groups, if the number is greater than 1, calculating the gray scale difference between the initial gray scale and the target gray scale in each preparation gray scale switching group, and using the preparation gray scale switching group corresponding to the gray scale difference with the minimum value as the to-be-detected gray scale switching group.
6. The method as claimed in claim 4, wherein the step of performing low-pass filtering on the first response time waveform corresponding to the first response time of the to-be-tested gray scale switching group to obtain the second response time waveform and the second response time of the to-be-tested gray scale switching group specifically comprises:
defining a cut-off frequency, and filtering out frequency components higher than the cut-off frequency in the first response time waveform of the to-be-detected gray scale switching group through low-pass filtering to obtain a second response time waveform of the to-be-detected gray scale switching group, wherein the abscissa and the ordinate of the second response time waveform are time and gray scale respectively, and the second response time is defined as a time period corresponding to a gray scale section from the initial gray scale to the target gray scale in the corresponding second response time waveform in the response time calculation rule.
7. The method according to claim 4, wherein in the step of switching the initial gray scale of the gray scale switching group to be tested to the target gray scale after the backlight brightness is increased to obtain a third response time waveform and a third response time of the gray scale switching group to be tested, the abscissa and the ordinate of the third response time waveform are time and gray scale respectively, and the third response time is defined as a time period corresponding to a gray scale section from the initial gray scale to the target gray scale in the response time calculation rule in the corresponding third response time waveform.
8. The method as claimed in claim 6, wherein the cut-off frequency is in the range of 200-2000 Hz.
9. The method for diagnosing the response time abnormality of the liquid crystal display panel according to claim 1, wherein the step of "increasing the backlight luminance of the liquid crystal display panel" specifically includes:
and the backlight brightness of the liquid crystal display panel is improved to be more than 300 nits.
10. The device for diagnosing the response time abnormity of the liquid crystal display panel is characterized by comprising a memory, a processor, a gray scale switching group determining module to be detected, a filtering module, a brightness improving module and a diagnosing module; the memory is coupled to the processor for storing a plurality of instructions executable by the processor, the plurality of instructions comprising:
controlling the gray scale switching group determining module to determine a plurality of gray scale switching groups according to the gray scale interval of the liquid crystal display panel; each gray scale switching group comprises an initial gray scale and a target gray scale which are mutually unequal, and the target gray scale is an endpoint gray scale of the gray scale interval;
controlling the to-be-detected gray scale switching group determining module to determine a gray scale switching group to be detected, which needs to be subjected to abnormal diagnosis, in a plurality of gray scale switching groups according to first response time of the initial gray scale of the gray scale switching group when the initial gray scale is switched to the target gray scale;
controlling the filtering module to perform low-pass filtering on a first response time waveform corresponding to the first response time of the gray scale switching group to be detected to obtain a second response time waveform and a second response time of the gray scale switching group to be detected;
controlling the brightness improving module to improve the backlight brightness of the liquid crystal display panel when the second response time of the gray scale switching group to be tested is shorter than the corresponding first response time, and switching the initial gray scale of the gray scale switching group to be tested into the target gray scale after improving the backlight brightness to obtain a third response time waveform and a third response time of the gray scale switching group to be tested;
controlling the diagnosis module to determine that the reason of abnormal response time is related to the backlight brightness under the condition that the third response time of the gray scale switching group to be detected is shorter than the corresponding first response time; and determining that the reason of the abnormal response time is related to the manufacturing process of the liquid crystal display panel under the condition that the second response time of the gray scale switching group to be detected is greater than or equal to the corresponding first response time or the third response time of the gray scale switching group to be detected is greater than or equal to the corresponding first response time.
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