CN113257160A - Detection device and detection method for display panel - Google Patents
Detection device and detection method for display panel Download PDFInfo
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- CN113257160A CN113257160A CN202110464614.5A CN202110464614A CN113257160A CN 113257160 A CN113257160 A CN 113257160A CN 202110464614 A CN202110464614 A CN 202110464614A CN 113257160 A CN113257160 A CN 113257160A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The application discloses a detection device and a detection method of a display panel, wherein the detection device comprises a power supply, a detection component, a comparison component and a judgment component, the detection component detects the brightness of each test area in the display panel, and the comparison component compares the brightness of each test area to form a brightness difference value; the judging component judges whether the brightness difference value exceeds a preset value or not and outputs a detection result; if the brightness difference value exceeds a preset value, outputting a detection result of uneven brightness of the display panel; and if the brightness difference value does not exceed a preset value, outputting a detection result that the brightness of the display panel is uniform. The step of observing brightness by naked eyes is omitted after the detection equipment is adopted, so that the automation level is greatly improved, and the test efficiency is improved; and the interference of human factors is avoided, so that an accurate test result can be obtained.
Description
Technical Field
The application relates to the technical field of display detection, in particular to a detection device and a detection method of a display panel.
Background
With the gradual improvement of the requirement of people on the visual quality, in order to meet the requirements of consumers, the larger the size of the liquid crystal television is, the higher the resolution is, the more obvious the difference of the charging effect of the near end and the far end is, and the worse the display uniformity is; when the brightness of the display panel is not uniform, various traces appear in the displayed image, and the brightness uniformity of the display panel reflects the quality of the display screen. If the brightness of the display screen is uniform, the image display effect is better, and if the brightness is non-uniform, the image display effect is poorer.
At present, the detection mode adopted for judging the uniformity of the display panel is inconvenient and completely depends on the use of an instrument and the judgment of human eyes, so that the brightness uniformity of the display panel is easily interfered by human factors, the obtained test result is not accurate enough, and the test efficiency is lower.
Disclosure of Invention
The application aims to provide the detection equipment and the detection method of the display panel, which have high automation degree and high test accuracy.
The application discloses detection equipment of a display panel, wherein the display area of the display panel is divided into a plurality of test areas, the detection equipment comprises a power supply, a detection component, a comparison component and a judgment component, the detection component is connected with the power supply and detects the brightness of each test area in the display panel; the comparison assembly is communicated with the detection assembly and compares the brightness of each test area to form a brightness difference value; the judgment component is communicated with the comparison component, judges whether the brightness difference value exceeds a preset value or not and outputs a detection result; if the brightness difference value exceeds a preset value, outputting a detection result of uneven brightness of the display panel; and if the brightness difference value does not exceed a preset value, outputting a detection result that the brightness of the display panel is uniform.
Optionally, the detection component includes a photoresistor, a detection resistor, an amplifier circuit and a calculation module, the photoresistor is arranged corresponding to the test area, the detection resistor is connected in series with the photoresistor, and the amplifier circuit detects a voltage of the detection resistor and converts the voltage into a voltage signal; the calculation module calculates the current value of the detection resistor and the current value of the photosensitive resistor which is equal to the current value of the detection resistor through the voltage and the resistance value of the detection resistor, and obtains the brightness value corresponding to the test area through the photoelectric characteristic curve of the photosensitive resistor.
Optionally, the amplifier circuit includes an amplifier, a first voltage dividing resistor, a second voltage dividing resistor, a third voltage dividing resistor, and a fourth voltage dividing resistor, and the amplifier is electrically connected to the computing module and outputs a voltage signal of the detection resistor; the input end of the first divider resistor is electrically connected with one end of the detection resistor, and the output end of the first divider resistor is electrically connected with the negative polarity input end of the amplifier; the input end of the second voltage-dividing resistor is electrically connected with the other end of the detection resistor, and the output end of the second voltage-dividing resistor is electrically connected with the positive electrode line input end of the amplifier; one end of the third voltage-dividing resistor is electrically connected with the output end of the second voltage-dividing resistor, and the other end of the third voltage-dividing resistor is grounded; the input end of the fourth voltage-dividing resistor is connected with the output end of the first voltage-dividing resistor, and the output end of the fourth voltage-dividing resistor is connected with the output end point of the amplifier; and the first voltage-dividing resistor, the second voltage-dividing resistor, the third voltage-dividing resistor and the fourth voltage-dividing resistor have the same resistance value.
Optionally, the number of the amplifier circuits corresponds to the number of the test areas one to one, and the plurality of amplifier circuits are electrically connected to the computing modules one to one; the test area comprises a first test area and a plurality of second test areas, the comparison module receives the brightness values output by all the calculation modules, and compares the brightness values corresponding to the second test areas with the brightness values corresponding to the first test area one by one to form a plurality of brightness difference values;
the judging module receives the brightness difference signals output by the comparing module, judges whether the brightness difference exceeds the preset value, and outputs a detection result of uneven brightness of the display panel if at least one brightness difference exceeds the preset value; and if all the brightness difference values do not exceed the preset value, the judgment module outputs a detection result that the brightness of the display panel is uniform.
Optionally, the number of the test areas is nine, the test areas are arranged in a nine-grid form, and the first test area is located in the center of the nine-grid form.
Optionally, the preset value is one tenth of the corresponding brightness value of the first test area.
Optionally, the display panel includes a control chip, and the calculation module, the comparison component and the judgment component are disposed on the control chip; the control chip is provided with a plurality of pins, and the amplifier circuit is communicated with the computing module through the pins.
The application also discloses a detection method of the display panel, which is used for the detection equipment, and the detection method comprises the following steps:
opening a display panel, and dividing a display area of the display panel into a plurality of test areas;
detecting the brightness of each test area;
comparing the brightness of each test area to obtain a brightness difference value; and
judging whether the brightness difference value exceeds a preset value or not, outputting a detection result, and if the brightness difference value exceeds the preset value, outputting a detection result of uneven brightness of the display panel; and if the brightness difference value does not exceed a preset value, outputting a detection result that the brightness of the display panel is uniform.
Optionally, the step of detecting the brightness of each test area includes:
arranging the same photoresistor in each test area;
detecting the voltage of a detection resistor connected in series with the photoresistor;
calculating the current of the detection resistor by using ohm's law, and obtaining the current of the photoresistor; and
and calculating the brightness value corresponding to the test area according to the photoelectric characteristic curve of the photoresistor.
Optionally, the display area of the display panel is divided into nine test areas, the nine test areas are arranged in a nine-grid form, each test area comprises a first test area and eight second test areas, and the first test area is located in the center of a nine-grid; in the step of comparing the brightness of each test area to obtain the brightness difference, respectively comparing the brightness values of eight second test areas and the first test area to obtain eight brightness differences;
judging whether the brightness difference value exceeds a preset value or not, outputting a detection result, and if the brightness difference value exceeds the preset value, outputting a detection result of uneven brightness of the display panel; if the brightness difference value does not exceed the preset value, the step of outputting the detection result that the brightness of the display panel is uniform comprises the following steps:
respectively judging whether the eight brightness difference values exceed preset values, and if at least one of the eight brightness difference values exceeds the preset value, outputting a detection result of uneven brightness of the display panel; and if the eight brightness difference values do not exceed the preset value, outputting a detection result that the brightness of the display panel is uniform.
Compared with the scheme of directly observing by human eyes at present, the detection equipment provided by the application can automatically detect the brightness of each test area in the display panel, automatically complete brightness comparison and automatic judgment of each detection area, and finally directly output a detection result, so that a detector can directly obtain the final result; thereby the step of observing the brightness by naked eyes is omitted, the automation level is greatly improved, and the testing efficiency is improved; and the interference of human factors is avoided, so that an accurate test result can be obtained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of a detection apparatus provided by an embodiment of the present application;
FIG. 2 is a schematic diagram of a detection module according to an embodiment of the present application;
FIG. 3 is a diagram illustrating an electro-optic characteristic of a photoresistor;
FIG. 4 is a schematic diagram of a partition of a display panel according to an embodiment of the present application;
FIG. 5 is a schematic view of a detection apparatus provided in another embodiment of the present application;
FIG. 6 is a flow chart of a detection method provided by another embodiment of the present application;
fig. 7 is a flowchart of detecting luminance according to another embodiment of the present application.
100, detecting equipment; 110. a power source; 120. a detection component; 121. a photoresistor; 122. detecting a resistance; 123. an amplifier circuit; 124. a calculation module; 125. an amplifier; 126. a first voltage dividing resistor; 127. a second voltage dividing resistor; 128. a third voltage dividing resistor; 129. a fourth voltage dividing resistor; 130. a comparison component; 140. a judging component; 200. a display panel; 210. a test area; 211. a first test area; 212. a second test area; 220. and a control chip.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Because the size of display screen is bigger and bigger, the screen is walked the line and is also longer and longer, walks that the impedance that is being kept away from the circuit board end is also bigger and bigger more and more, leads to keeping away from the not good thin film crystal charging effect of circuit board end, and the effect difference that appears that the display screen near-end charges and the far-end charges is more and more obvious, causes the demonstration homogeneity of panel to worsen. The traditional means for judging the uniformity of the panel mainly comprises that human eyes observe the uniformity through display test equipment; the method has the advantages of high dependence on people, complicated steps and low detection precision.
In view of the above problems, the present application provides a detection apparatus for a display panel with high automation degree and high precision and a detection method thereof, and the following describes the present application in detail with reference to the accompanying drawings and alternative embodiments.
As shown in fig. 1, as an embodiment of the present application, a detection apparatus 100 for a display panel is disclosed, a display area of the display panel 200 is divided into a plurality of test areas 210, the detection apparatus 100 includes a power supply 110, a detection component 120, a comparison component 130 and a determination component 140, the detection component 120 turns on the power supply 110 and detects brightness of each test area 210 in the display panel 200; the comparison component 130 is communicated with the detection component 120, and compares the brightness of each test area 210 to form a brightness difference value; the judging component 140 is communicated with the comparing component 130, judges whether the brightness difference value exceeds a preset value, and outputs a detection result; if the brightness difference value exceeds a preset value, outputting a detection result of uneven brightness of the display panel 200; and if the brightness difference value does not exceed the preset value, outputting a detection result that the brightness of the display panel 200 is uniform.
Compared with the scheme of directly observing by human eyes at present, the detection equipment 100 provided by the application can automatically detect the brightness of each test area 210 in the display panel 200, automatically complete brightness comparison and automatic judgment of each detection area, and finally directly output a detection result, so that detection personnel can know the uniformity of the panel through the detection result without comparing the detection results one by one with naked eyes, thereby ensuring that the detection is more convenient and intelligent, greatly improving the automation level and improving the test efficiency; and the interference of human factors is avoided, so that an accurate test result can be obtained.
Specifically, when the detecting element 120 detects the brightness of one testing area 210, the light of other areas can be shielded first, so as to prevent the detecting element from being influenced by the brightness of other testing areas 210 in the detecting process; the different driving test regions 210 can also be driven separately by driving one test region 210, that is, driving one test region 210, transmitting a white field signal to the test region 210, and then detecting the brightness of the test region, so as to sequentially detect the brightness of all the test regions 210, which can also prevent the detection assembly 120 from being affected by the brightness in other test regions 210 during the detection process, thereby improving the detection accuracy.
Moreover, the number of the detecting elements 120 in this application may be only one, so that each of the testing regions 210 is individually detected, and the detecting elements 120 may be an instrument for directly measuring the brightness, such as a spectral brightness detector, in which the detecting principle is that the light of the display panel 200 is filtered by red, green and blue filters and then transmitted to a sensor, and the sensor analyzes the captured light and directly feeds back the brightness value of the light.
Of course, the present disclosure can also detect all the test areas 210 at the same time, so as to improve the detection efficiency, specifically, the detection component 120 is a detection circuit, and measures the brightness of the test areas 210 in an indirect manner; moreover, the devices used in the detection mode are all general electrical components, and the cost is low, so that the cost of the detection equipment 100 is reduced.
As shown in fig. 2 and 3, the detecting component 120 includes a light dependent resistor 121, a detecting resistor 122, an amplifier circuit 123 and a calculating module 124, the light dependent resistor 121 is disposed corresponding to the testing area 210, the detecting resistor 122 is connected in series with the light dependent resistor 121, and the amplifier circuit 123 detects the voltage of the detecting resistor 122 and converts the voltage into a voltage signal; the calculating module 124 calculates a current value of the detecting resistor 122 and a current value of the photo resistor 121 equal to the current value of the detecting resistor 122 according to the voltage and the resistance value of the detecting resistor 122, and obtains a luminance value corresponding to the testing area 210 according to a photoelectric characteristic curve of the photo resistor 121.
The number of the detecting elements 120 corresponds to the number of the testing areas 210, and the brightness values measured by all the detecting elements 120 are output to the comparing element 130 and compared by the comparing element 130. The photo-resistor 121 in each detection assembly 120 may be one or more, and is configured as required. In addition, since the resistance value of the photo resistor 121 varies with the change of the brightness of the test area 210, the electrical property of the photo resistor 121 cannot be directly measured, and the current in the photo resistor 121 connected in series with the current is further obtained by measuring the current of the detection circuit, so that the error of the characteristics of the photo resistor 121 on the detection result is reduced.
Compared with other schemes for testing the brightness of the display panel 200, the present application can detect the brightness of the display panel 200 in real time through the photo resistor 121, and since the brightness of the display panel 200 is difficult to maintain the same level and the brightness is changed, the measurement methods in the prior art all have large deviation; the detection data can be changed along with the change of the brightness of the display panel 200, the detection result cannot be influenced, and the measurement accuracy is greatly guaranteed.
In fig. 2, the amplifier circuit 123 includes an amplifier 125, a first voltage dividing resistor 126, a second voltage dividing resistor 127, a third voltage dividing resistor 128 and a fourth voltage dividing resistor 129, and the amplifier 125 is electrically connected to the calculating module 124 and outputs a voltage signal of the detecting resistor 122; the input end of the first voltage dividing resistor 126 is electrically connected to one end of the detection resistor 122, and the output end is electrically connected to the negative polarity input end of the amplifier 125; the input end of the second voltage-dividing resistor 127 is electrically connected with the other end of the detection resistor 122, and the output end is electrically connected with the positive line input end of the amplifier 125; one end of the third voltage dividing resistor 128 is electrically connected to the output end of the second voltage dividing resistor 127, and the other end is grounded; the input terminal of the fourth voltage-dividing resistor 129 is connected to the output terminal of the first voltage-dividing resistor 126, and the output terminal is connected to the output terminal of the amplifier 125; the first voltage-dividing resistor 126, the second voltage-dividing resistor 127, the third voltage-dividing resistor 128 and the fourth voltage-dividing resistor 129 are equal in resistance.
The operating principle of the amplifier circuit 123 is: voltage V at one end of the detection resistor 122(R2)1And the voltage at the other end is recorded as V2The amplifier 125A1 is an operational amplifier 125(OP) which is a subtraction circuit, shown as a triangle, with the positive input V of the OP+The voltage V1 is obtained by dividing the voltage by 2 divider resistors R, and the resistance values of the two divider resistors R are the same, so that V+＝(V1)/2. And negative polarity input terminal V of OP-Is the actual output voltage V2Output V of and OPoutDo a difference to obtain, i.e. V-＝V2-(V2-VOUT)/2＝(V2+Vout) 2; and according to the characteristics of OP, V+＝V-Therefore has (V)1)/2＝(V2+VOUT) 2, i.e. V1＝V2+VOUTFinally obtaining VOUT＝V1-V2Then obtain VOUTIs exactly V1And V2Pressure difference of (i.e.The voltage of the resistor 122 is detected. Thus, when the brightness of the test area 210 changes, V is detected1And V2The voltage across the detection resistor 122 is obtained from the voltage difference, i.e. the current I ═ V flowing across the detection resistor 122 is obtainedOUTand/R2, obtaining the current at the two ends of the photo-resistor 121(R1), and finally obtaining the luminance value corresponding to the test area 210 according to the photoelectric characteristic curve of the photo-resistor 121 as shown in fig. 3.
In this embodiment, the comparison manner of the comparison component 130 may be to compare the brightness of one test area 210 with the brightness of all other test areas 210, or to compare the brightness of adjacent test areas 210, or to compare the brightness of two adjacent rows of test areas 210.
Preferably, the first comparison method is adopted in the present application, specifically, the number of the amplifier circuits 123 corresponds to the number of the test areas 210 one to one, and the plurality of amplifier circuits 123 are electrically connected to the computing modules 124 one to one; the test area 210 includes a first test area 211 and a plurality of second test areas 212, and the comparing module receives the light brightness values output by all the calculating modules 124 and compares the light brightness values corresponding to the plurality of second test areas 212 with the light brightness values corresponding to the first test areas 211 one by one to form a plurality of brightness difference values.
In the present embodiment, the comparison method takes the brightness of one test area 210 as the comparison target, so as to define a detection criterion, which can detect whether the brightness of all test areas 210 is within a small deviation range.
Further, as shown in fig. 4, the number of the test areas 210 is nine, that is, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, and Y9, and the test areas are arranged in the form of a nine-grid, and the first test area Y5 is located at the center of the nine-grid. Since the middle area of the display panel 200 is watched by the eyes at first, the middle test area 210 is used as a reference to have a convincing effect, and the use requirement of the user can be met.
Finally, the determining component 140 receives the plurality of luminance difference signals output by the comparing module (when the number of the test regions 210 is nine, the determining component 140 receives eight luminance difference signals), determines whether the luminance difference exceeds the preset value, and if at least one luminance difference exceeds the preset value, the determining component 140 outputs a detection result that the luminance of the display panel 200 is not uniform; if all the brightness difference values do not exceed the preset value, the determining component 140 outputs the detection result that the brightness of the display panel 200 is uniform.
The preset value is one tenth of the brightness value corresponding to the first test area 211, that is, the difference between the brightness of all the second test areas 212 and the brightness of the second test areas 212 cannot exceed one tenth of the brightness value of the first test area 211 at this time. Of course, the specific adjustment can be carried out according to the use condition.
In addition, the detection device 100 is further provided with a storage component, which can record the detection result and store the output results of the detection component 120, the comparison component 130 and the judgment component 140, so that the detection personnel can perform subsequent analysis conveniently to find out the problem in the display panel 200.
In the present application, the whole detection device 100 may be an external structure, and if the display panel 200 needs to be tested, the detection assembly 120 corresponds to the test area 210 of the panel, so that the use of the detection device 100 is not limited by the detection object. Of course, some components of the detecting device 100 can be implemented in the display panel 200, so that the detection is more targeted, and the occupied area and the cost of the detecting device 100 are saved, such as: as shown in fig. 5, in the present application, the calculation module 124, the comparison component 130, the judgment component 140, and the storage component in the detection device 100 may be disposed on a Control chip 220 of the display panel 200, which may be a timing Control chip 220 (T-con); the control chip 220 is provided with a plurality of pins (not shown), and the amplifier circuit 123 is connected to the computing module 124 through the pins.
As shown in fig. 6, as another embodiment of the present application, a method for detecting a display panel is further disclosed, which is used for detecting luminance uniformity of the display panel and is suitable for the above detection apparatus, and the method for detecting the luminance uniformity of the display panel includes the steps of:
s1: opening a display panel, and dividing a display area of the display panel into a plurality of test areas;
s2: detecting the brightness of each test area;
s3: comparing the brightness of each test area to obtain a brightness difference value;
s4: judging whether the brightness difference value exceeds a preset value or not, outputting a detection result, and if the brightness difference value exceeds the preset value, outputting a detection result of uneven brightness of the display panel; and if the brightness difference value does not exceed a preset value, outputting a detection result that the brightness of the display panel is uniform.
The detection device and the display panel are oppositely arranged, the detection assembly and each test area of the display panel are correspondingly arranged, and the brightness value of the corresponding test area is detected. By adopting the detection method in the implementation, the interference of human factors is avoided, the uniformity of the brightness of each part of the display panel can be accurately obtained, and the detection personnel do not need to observe the brightness condition through naked eyes, so that the final feedback result is directly observed, and the automation degree is greatly improved.
In step S1, the display area is divided into several areas, and the more areas, the more accurate the value of the uniformity of the panel luminance is finally obtained. However, since the more partitions require more detection assemblies, which increases the detection cost, the area to be tested is preferably divided into nine test areas in a grid form, and the nine test areas are arranged in a grid form and include a first test area and eight second test areas, and the first test area is located in the center of the grid form. The naming of each region, Y5 for the middle region and Y1-Y4, Y6-Y9 for the panel peripheral region, respectively, is such that not too many detection modules are employed, nor the final value is inaccurate due to not many display sections.
As shown in fig. 7, in the S2 step, the step of detecting the luminance includes:
s21: arranging the same photoresistor in each test area;
s22: detecting the voltage of a detection resistor connected in series with the photoresistor;
s23: calculating the current of the detection resistor by using ohm's law, and obtaining the current of the photoresistor;
s24: and calculating the brightness value corresponding to the test area according to the photoelectric characteristic curve of the photoresistor.
The luminance value of the test area is detected through indirect measurement, and compared with a mode of directly detecting luminance by luminance meter equipment, the detection cost is greatly reduced.
The step of S3 is specifically: and respectively comparing the light brightness values of the eight second test areas and the first test area to obtain eight brightness difference values.
The comparison module receives the light brightness values transmitted by the nine detection modules, the comparison mode is that the Y1-Y4 and the Y6-Y9 are respectively subjected to difference with the Y5 to obtain absolute values, the maximum absolute difference is selected, the comparison mode accords with that the focus of a user is a Y5 area when the user watches the screen, the absolute difference obtained through comparison reflects the brightness difference of the middle area of the panel, the brightness difference of two corners cannot occur, and the yield can be improved within the acceptable range of the user. Note that the absolute value of the difference is finally output.
The step of S4 is specifically: respectively judging whether the eight brightness difference values exceed preset values, and if at least one of the eight brightness difference values exceeds the preset value, outputting a detection result of uneven brightness of the display panel; and if the eight brightness difference values do not exceed the preset value, outputting a detection result that the brightness of the display panel is uniform.
In the step S4, the preset value is one tenth of the brightness value corresponding to the first test area, and the determination module detects the brightness of all the test areas at the same time, either all the test areas are qualified or the display panel is directly unqualified, thereby avoiding the occurrence of over-bright or over-dark condition in a certain area and improving the yield of the product after leaving the factory.
It should be noted that, the limitations of each step in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all the steps should be considered as belonging to the protection scope of the present application.
It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced
The technical solution of the present application can be widely applied to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panel, and the above solution can be applied thereto.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. An inspection apparatus of a display panel, characterized in that a display area of the display panel is divided into a plurality of test areas, the inspection apparatus comprising:
a power source;
the detection assembly is connected with the power supply and detects the brightness of each test area in the display panel;
the comparison assembly is communicated with the detection assembly and is used for comparing the brightness of each test area to form a brightness difference value; and
the judgment component is communicated with the comparison component, judges whether the brightness difference value exceeds a preset value or not and outputs a detection result;
if the brightness difference value exceeds a preset value, outputting a detection result of uneven brightness of the display panel; and if the brightness difference value does not exceed a preset value, outputting a detection result that the brightness of the display panel is uniform.
2. The inspection apparatus of a display panel according to claim 1, wherein the inspection assembly comprises:
the photoresistor is arranged corresponding to the test area;
the detection resistor is connected with the photosensitive resistor in series;
the amplifier circuit detects the voltage of the detection resistor and converts the voltage into a voltage signal; and
and the calculation module is used for calculating the current value of the detection resistor and the current value of the photosensitive resistor which is equal to the current value of the detection resistor through the voltage and the resistance value of the detection resistor, and obtaining the brightness value corresponding to the test area through the photoelectric characteristic curve of the photosensitive resistor.
3. The inspection apparatus of a display panel according to claim 2, wherein the amplifier circuit comprises:
the amplifier is electrically connected with the computing module and outputs a voltage signal of the detection resistor;
the input end of the first voltage-dividing resistor is electrically connected with one end of the detection resistor, and the output end of the first voltage-dividing resistor is electrically connected with the negative polarity input end of the amplifier;
the input end of the second voltage-dividing resistor is electrically connected with the other end of the detection resistor, and the output end of the second voltage-dividing resistor is electrically connected with the positive line input end of the amplifier;
one end of the third voltage-dividing resistor is electrically connected with the output end of the second voltage-dividing resistor, and the other end of the third voltage-dividing resistor is grounded; and
the input end of the fourth voltage-dividing resistor is connected with the output end of the first voltage-dividing resistor, and the output end of the fourth voltage-dividing resistor is connected with the output end point of the amplifier;
and the first voltage-dividing resistor, the second voltage-dividing resistor, the third voltage-dividing resistor and the fourth voltage-dividing resistor have the same resistance value.
4. The inspection apparatus for a display panel according to claim 3, wherein the number of the amplifier circuits corresponds to the number of the test areas one to one, and a plurality of the amplifier circuits are electrically connected to the calculation module one to one;
the test area comprises a first test area and a plurality of second test areas, the comparison module receives the brightness values output by all the calculation modules, and compares the brightness values corresponding to the second test areas with the brightness values corresponding to the first test area one by one to form a plurality of brightness difference values;
the judging module receives the brightness difference signals output by the comparing module, judges whether the brightness difference exceeds the preset value, and outputs a detection result of uneven brightness of the display panel if at least one brightness difference exceeds the preset value; and if all the brightness difference values do not exceed the preset value, the judgment module outputs a detection result that the brightness of the display panel is uniform.
5. The inspecting apparatus for a display panel according to claim 4, wherein said test areas are nine in number and arranged in a nine-grid pattern, and said first test area is located at a center position of the nine-grid pattern.
6. The apparatus for inspecting a display panel according to claim 4, wherein the predetermined value is one tenth of a value of the luminance corresponding to the first test area.
7. The apparatus for inspecting a display panel according to claim 2, wherein the display panel includes a control chip, and the calculation module, the comparison component, and the judgment component are provided on the control chip;
the control chip is provided with a plurality of pins, and the amplifier circuit is communicated with the computing module through the pins.
8. A method of inspecting a display panel, for use in an inspection apparatus according to any one of claims 1 to 7, comprising the steps of:
opening a display panel, and dividing a display area of the display panel into a plurality of test areas;
detecting the brightness of each test area;
comparing the brightness of each test area to obtain a brightness difference value; and
judging whether the brightness difference value exceeds a preset value or not, outputting a detection result, and if the brightness difference value exceeds the preset value, outputting a detection result of uneven brightness of the display panel; and if the brightness difference value does not exceed a preset value, outputting a detection result that the brightness of the display panel is uniform.
9. The method for inspecting a display panel according to claim 8, wherein the step of inspecting the brightness of each of the test areas comprises:
arranging the same photoresistor in each test area;
detecting the voltage of a detection resistor connected in series with the photoresistor;
calculating the current of the detection resistor by using ohm's law, and obtaining the current of the photoresistor; and
and calculating the brightness value corresponding to the test area according to the photoelectric characteristic curve of the photoresistor.
10. The inspection method of a display panel according to claim 9, wherein the display area of the display panel is divided into nine test areas, the nine test areas are arranged in a nine-grid format, the test areas include a first test area and eight second test areas, and the first test area is located at a center position of the nine-grid format;
in the step of comparing the brightness of each test area to obtain the brightness difference, respectively comparing the brightness values of eight second test areas and the first test area to obtain eight brightness differences;
judging whether the brightness difference value exceeds a preset value or not, outputting a detection result, and if the brightness difference value exceeds the preset value, outputting a detection result of uneven brightness of the display panel; if the brightness difference value does not exceed the preset value, the step of outputting the detection result that the brightness of the display panel is uniform comprises the following steps:
respectively judging whether the eight brightness difference values exceed preset values, and if at least one of the eight brightness difference values exceeds the preset value, outputting a detection result of uneven brightness of the display panel; and if the eight brightness difference values do not exceed the preset value, outputting a detection result that the brightness of the display panel is uniform.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200286A (en) * | 2021-11-30 | 2022-03-18 | 昆山国显光电有限公司 | Performance evaluation method and device for luminescent material of display module |
| CN115691444A (en) * | 2022-10-31 | 2023-02-03 | 惠科股份有限公司 | Driving method and display panel |
| CN115798421A (en) * | 2022-11-30 | 2023-03-14 | 惠科股份有限公司 | Driving method and driving circuit of display panel and display device |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200813916A (en) * | 2006-09-05 | 2008-03-16 | Inventec Appliances Corp | Screen brightness adjusting device and method for adjusting screen brightness of electronic device |
| CN101325043A (en) * | 2007-06-15 | 2008-12-17 | 乐金显示有限公司 | Driving circuit of liquid crystal display device and method for driving the same |
| TW201346879A (en) * | 2012-05-09 | 2013-11-16 | Mstar Semiconductor Inc | Measure equipment and associated method for response speed of display panel |
| CN103971624A (en) * | 2013-01-28 | 2014-08-06 | 富泰华工业（深圳）有限公司 | Light-leaking detection system and method |
| CN105679221A (en) * | 2016-03-31 | 2016-06-15 | 广东欧珀移动通信有限公司 | Chromatic aberration detection method and device and terminal |
| CN109239980A (en) * | 2018-11-28 | 2019-01-18 | 厦门天马微电子有限公司 | Backlight assembly and display device |
| CN109712592A (en) * | 2019-02-18 | 2019-05-03 | 惠科股份有限公司 | Brightness adjusting method and display device |
| CN109754770A (en) * | 2019-02-25 | 2019-05-14 | 惠科股份有限公司 | The brightness adjusting method and display device of display panel |
| CN110088828A (en) * | 2016-10-26 | 2019-08-02 | 堺显示器制品株式会社 | Correction system |
-
2021
- 2021-04-28 CN CN202110464614.5A patent/CN113257160A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200813916A (en) * | 2006-09-05 | 2008-03-16 | Inventec Appliances Corp | Screen brightness adjusting device and method for adjusting screen brightness of electronic device |
| CN101325043A (en) * | 2007-06-15 | 2008-12-17 | 乐金显示有限公司 | Driving circuit of liquid crystal display device and method for driving the same |
| TW201346879A (en) * | 2012-05-09 | 2013-11-16 | Mstar Semiconductor Inc | Measure equipment and associated method for response speed of display panel |
| CN103971624A (en) * | 2013-01-28 | 2014-08-06 | 富泰华工业（深圳）有限公司 | Light-leaking detection system and method |
| CN105679221A (en) * | 2016-03-31 | 2016-06-15 | 广东欧珀移动通信有限公司 | Chromatic aberration detection method and device and terminal |
| CN110088828A (en) * | 2016-10-26 | 2019-08-02 | 堺显示器制品株式会社 | Correction system |
| CN109239980A (en) * | 2018-11-28 | 2019-01-18 | 厦门天马微电子有限公司 | Backlight assembly and display device |
| CN109712592A (en) * | 2019-02-18 | 2019-05-03 | 惠科股份有限公司 | Brightness adjusting method and display device |
| CN109754770A (en) * | 2019-02-25 | 2019-05-14 | 惠科股份有限公司 | The brightness adjusting method and display device of display panel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200286A (en) * | 2021-11-30 | 2022-03-18 | 昆山国显光电有限公司 | Performance evaluation method and device for luminescent material of display module |
| CN115691444A (en) * | 2022-10-31 | 2023-02-03 | 惠科股份有限公司 | Driving method and display panel |
| CN115691444B (en) * | 2022-10-31 | 2024-01-30 | 惠科股份有限公司 | Driving method and display panel |
| CN115798421A (en) * | 2022-11-30 | 2023-03-14 | 惠科股份有限公司 | Driving method and driving circuit of display panel and display device |
| CN115798421B (en) * | 2022-11-30 | 2024-03-19 | 惠科股份有限公司 | Driving method, driving circuit and display device of display panel |
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