KR20120103942A - Display inpection method and device - Google Patents

Abstract

PURPOSE: A method and an apparatus for inspecting a display are provided to measure brightness and a color coordinate for a whole screen by using a 2D brightness and color coordinate measuring instrument for the uniformity of a large screen. CONSTITUTION: A user inputs a target value of desired brightness and a color coordinate, a first measurement collection and a final measurement collection(S310). A quantified brightness value and a color coordinate value are obtained by calculating image quality data of a display device(S320). Screen data of the display device is changed when the screen data is not reached to the target value(S340). [Reference numerals] (AA) Start; (BB) End; (S310) Input a target value and first and final measurement collections; (S320) Obtaining a measurement value by repeated measurement; (S330) Does the measurement value reach the target value?; (S340) Changing the screen data of a display device; (S350) Determining the number of measurement in next step

Description

DISPLAY INPECTION METHOD AND DEVICE}

The present invention relates to a method for correcting uniformity of image quality of a display device and an apparatus thereof.

Today, the display device is a liquid crystal display (LCD), a plasma display panel (PDP), a light emitting display (Electrode), an electric field from an athode ray tube (CRT) method of the past. It is changing in the direction of using an emission display device or the like.

When manufacturing such a display device, it is important to ensure uniformity of image quality of a large screen. As one method for ensuring such uniformity, for example, in the image quality inspection of the liquid crystal display device, there is a method of lighting the liquid crystal panel and analyzing the degree of image quality of the display surface of the liquid crystal display device.

Another method is to use a 2D colorimeter. The classification of the color seen by the human eye is subjective, but the color of the sample can be objectively specified by determining the physical value of the color with this two-dimensional image measuring instrument.

However, when measuring the image quality of a large screen using a two-dimensional luminance color coordinate measuring device, due to the disadvantage that takes a lot of time affects the display device productivity.

Therefore, when using a two-dimensional image quality meter to ensure the uniformity of the large screen, there is a need for a method and apparatus for shortening the measurement time.

The problem to be solved by the present invention is to measure the luminance and color coordinates of the entire area of the screen using a two-dimensional luminance color coordinate measuring machine to ensure uniformity of the large screen, and to adjust to correct to obtain the target luminance, color coordinates SUMMARY OF THE INVENTION The present invention provides a method and apparatus for shortening the measurement time of a two-dimensional luminance color coordinate measuring instrument.

Problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

One aspect of the display inspection method of the present invention for solving the above problems is a first measurement of the image quality of the display device by repeatedly measuring the display device n times (where n is a natural number) using a two-dimensional image quality meter. Acquiring a value, comparing the first measured value with a target value, changing screen data of the display device according to a comparison result, and using the two-dimensional image quality meter, However, m is a natural number greater than n) and repeating measurements to obtain a second measurement value for the image quality of the display.

One aspect of the display inspection apparatus of the present invention for solving the above problems is a measurement value acquisition unit and the measurement value for repeatedly measuring the display device to obtain a measurement value for the image quality of the display device using a two-dimensional image quality meter Is compared with a target value, the screen data of the display device includes a screen data change unit according to the comparison result, the measurement value acquisition unit repeats n times (where n is a natural number) using the two-dimensional image quality meter By obtaining a first measurement value for the image quality of the display device, the data changer compares the first measurement value with a target value, changes screen data of the display device according to a comparison result, and obtains the measurement value The repeating side of the display apparatus m times (where m is a natural number larger than n) by using the two-dimensional image quality measuring unit. And to obtain a second measured value for the image quality of the display.

Other specific details of the invention are included in the detailed description and drawings.

According to the present invention, by using a two-dimensional luminance color coordinate measuring device to ensure the uniformity of the large screen, by measuring the luminance and color coordinates of the entire area of the screen, by adjusting it to shorten the time to correct to obtain the target luminance, color coordinates The production efficiency of the display device can be improved.

FIG. 1 is a block diagram showing a state of performing correction to secure uniformity of a screen using a two-dimensional luminance color coordinate measuring instrument.
Figure 2 is a block diagram showing the configuration of the present inventors time compensation device.
3 is a flowchart illustrating an embodiment of a method of shortening a compensation time of the present invention.
Figure 4 is a flow chart showing another embodiment of the present invention compensation time reduction method.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the present invention will be described with reference to the drawings for a block diagram or a processing flowchart for explaining a display inspection method and apparatus according to embodiments of the present invention. At this point, it will be understood that each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It creates a means to perform the functions. These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a measurement manner. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s). Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps are performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart block (s).

In addition, each block may represent a portion of a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s). It should also be noted that in some alternative implementations, the functions mentioned in the blocks may occur out of order. For example, the two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the corresponding function.

Although the first, second, etc. are used to describe various elements, components and / or sections, it is needless to say that these elements, components and / or sections are not limited by these terms. These terms are only used to distinguish one element, element or section from another element, element or section. Therefore, it goes without saying that the first element, the first element or the first section mentioned below may be the second element, the second element or the second section within the technical spirit of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

1 shows an example of a block diagram constituting a measurement and correction device for ensuring uniformity of a large screen.

As used herein, the term 'unit', that is, 'module' or 'table' or the like, refers to a hardware component such as software, a field programmable gate array (FPGA), or an application specific integrated circuit (ASIC). The module performs some functions. However, a module is not limited to software or hardware. A module may be configured to reside on an addressable storage medium and configured to play back one or more processors. Thus, as an example, a module may include components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, subroutines. , Segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within the components and modules may be combined into a smaller number of components and modules or further separated into additional components and modules. In addition, the components and modules may be implemented to reproduce one or more CPUs in a device.

A 2D colorimeter, also called a colorimeter, typically has a three-color colorimeter, which is designed to compare the color of the light to be measured with the color obtained by increasing or decreasing the three-color light of the basic colors of the colorimeter, red, green, and blue. have. When the mixed color looks like the color of light to be measured, the amount of the primary color, or tristimulus value, is obtained by the scale, and the chromaticity coordinates are calculated based on the amount, and then the value is obtained according to the CIE standard color system. The chromaticity is obtained by converting the value.

The structure that obtains the luminance or color coordinate value by measuring the image quality of the display screen using such a two-dimensional image quality meter (hereinafter referred to as a two-dimensional luminance color coordinate measuring instrument) is a measurement that detects and measures light of a sample by an optical sensor or a sensor. The data processing unit 20 calculates the luminance or color coordinates of the screen of the display apparatus measuring the data acquired by the measurement unit, and the data processed according to the user's needs using the result data calculated by the data processing unit. It may be composed of a processing unit (30).

In this case, when measuring using a two-dimensional luminance color coordinate measuring instrument to ensure the uniformity of the large screen, in order to increase the accuracy of measurement, the number of times the data is acquired by the CCD (Charge Coupled Device) is set several times, and the average value is set. The method to be used is used, for example, 16 sets of measurements can be set as one set, and a set of measurements can be used, and the average can be used as final data. By the way, the two-dimensional luminance color coordinate measuring device takes about 3 seconds for one set of measurement, and some products take more than 10 seconds depending on the product. If it is assumed that one set takes about four seconds, the total time will be at least 48 seconds if the target uniformity can be achieved through 16 sets of repeated measurements and calibrations of this process.

However, rather than having to go through such processing process for every display device to be produced, the total measurement time for each display device is shortened by varying the precision of measurement according to the measurement time point, and in addition, flexibly for each display device. By making it possible to further shorten the measurement and correction time, it is possible to shorten the correction time of the display image quality, thereby increasing the production efficiency.

2 is a block diagram illustrating an apparatus for shortening a compensation time according to an embodiment of the present invention.

The configuration of the compensation time reduction apparatus according to the present invention measures the brightness or color coordinates of the screen of the display device and transmits the measured value acquisition unit 210 and the measured value acquisition unit 210 to calculate the measured luminance and color coordinate data. The display device when the measured value does not reach the target value by comparing the measured value with the target value in the measurement frequency determination unit 220 and the measurement frequency determination unit 220 to determine the number of times of the next round based on the received measurement value. And a screen data adjusting unit 230 for changing the screen data of the screen, and an input unit 240 for receiving a luminance, target values for color coordinates, first and second reference values, and the like by the user.

The measurement value acquisition unit 210 may include a measurement unit 212 for measuring luminance or color coordinates of a screen of a display device as a measurement target, a data operation unit 214 for calculating luminance or color coordinates using data acquired by the measurement unit 212, Among the data acquired by the measurement unit 212 may be configured as a data screening acquisition unit 216 to selectively acquire according to the user's needs and to transfer it to the data operation unit 214.

The measurement unit 212 measures screen data of the display apparatus 250. Screen data may typically be luminance or color coordinates, and may be measured individually or simultaneously. To this end, the measurement unit 212 may include an optical sensor such as a charge coupled device (CCD). The measurement unit 212 acquires screen data of the display device using the optical sensor and transmits the screen data to the data operation unit 214.

The data operation unit 214 quantizes the measured screen data received from the measurement unit 212 with a specific numerical value, and transmits the calculated luminance or color coordinate values to the measurement frequency determination unit 220. Such a data calculating unit is mounted inside the two-dimensional luminance color coordinate measuring unit so that the numerical value thereof can be immediately checked, and as shown in FIG. 2, the data calculating unit is provided separately from the two-dimensional luminance color coordinate measuring unit. It may also be included.

The data sorting obtaining unit 216 sorts and acquires some of the data obtained by the measurement unit 212 and transmits the sorted data to the data calculating unit 214. By selectively acquiring only data of a valid portion, such as an image of a display screen region, from the data obtained when the sample (screen of the display device to be photographed) is photographed by the measuring unit 212, the amount of computation that the data calculating unit 214 must process is reduced. To do so. More details will be described later.

The measurement frequency determiner 220 compares the luminance value or color coordinate value, which is calculated by the numerical value quantified from the data operation unit 214, with the target value previously input by the user, and determines the number of measurement times of the next round based on this. . The next determined number of times of measurement is transmitted to the measuring unit 212 and the screen data adjusting unit 230. The measurement unit 212 measures the display apparatus 250 according to the number of measurements received, and the screen data adjusting unit 230 measures that the measured luminance or color coordinate value reaches a target value and no further measurement and compensation are necessary. The screen data of the sample 250 is changed unless determined by the collection determining unit 220. An embodiment for determining the number of measurements of the next round will be described later.

The input unit 240 may receive a target value of luminance or color coordinates, or first and second reference values, and first and last measurement times from the user and transmit the target value to the measurement frequency determiner 220. However, if it is not necessary to change the luminance, the target value of the color coordinates, the first reference value, the second reference value, and the first and last measurement times according to the situation, the fixed target target value, the first and second reference values that are set in advance, may be determined. The input unit 240 may be preset and stored. In this case, the input unit 240 may not be necessary. The input unit may include a button, a wheel, a jog shuttle, and the like to receive a command from a user, and the input unit may be a separate device by itself.

3 is a diagram illustrating an example of a method of shortening a compensation time. The method of shortening the compensation time of the present invention described with reference to FIG. 2 will be described in detail with reference to FIG. 3.

In general, in order to output final data using a two-dimensional luminance color coordinate measuring device, light of a sample is sensed, and luminance or color coordinates are detected from the data. In order to increase the accuracy, light sensing is performed several times and the luminance or color coordinates are calculated from the accumulated data. Calculate the color coordinates. Increasing the precision through multiple repetitive sensing is one of the important ways to secure the precision as a screen inspection device.

In this way, if the brightness or color coordinate of the screen is measured and the value does not match the target value, the screen data of the display device to be measured is changed using the data, and the brightness or color coordinate is measured again, and the uniformity of the entire screen is repeated. In the case of working to secure the performance, the desired purpose can be achieved without the final precise measurement necessary for each measurement. On the other hand, the change of the screen data of the display device here means that the measurement is performed with the same gradation value output on all screens when the samples are measured. At this time, in order to adjust the unevenness found in a uniform direction, It means to change the gradation value.

Securing the uniformity of the large screen through repeated measurement and correction using the two-dimensional luminance color coordinate measuring machine is to repeat the luminance or color coordinate value that is far from the target value set by the user while making the repeated measurement to meet the target value. It is a process. Therefore, if the first measured value is far from the target, repeated measurement and correction will be made several times later. Therefore, it is possible to calibrate even if the approximate value is measured without precise measurement at the next measurement, and the luminance and color coordinates measured through this process When the value is close to the target value set by the user, correct it by increasing the accuracy by increasing the number of measurements in the next round.

For example, assuming that the number of repeated measurements necessary for the precise measurement that is finally needed is 16, from the beginning, it is not corrected by measuring 12 sets of 16 sets as 1 set for precise measurement, The measurement is repeated four times in one set to obtain and correct the data to get closer to the target value desired by the user.The next time, the eight times are measured in one set for four times, and the accuracy is slightly increased to measure and correct the target. It is closer to the value, and then the user can finally reach the desired target value by repeatedly measuring and calibrating 16 times, one set of 16 times, which is required for the precise measurement required.

In FIG. 3, the user receives a target value of a desired luminance or color coordinate, an initial measurement number, and a final measurement number (S310). The image quality data of the display device to be measured is repeatedly obtained by repeating the first measurement times and calculated to obtain a quantified luminance value or color coordinate value (S320). If it is determined whether the luminance value or the color coordinate value thus obtained has reached the target value, and it is determined that the target value has been reached, the process ends without performing further measurement and compensation processes.

However, if the target value is not reached, the screen data of the display device is changed (S340). In addition, the number of times of measurement of the next round is determined, but the number of times of measurement of the next round is preferably higher than the number of times of measurement of the previous order, as in the above-described embodiment, but is not limited thereto. For example, in order to measure the initial number of measurements more accurately, measure 16 times in one set, check the difference between the target value and the measured value, and then increase the order from the next measurement to one set of four times and one set of eight times. You can also measure.

On the other hand, the number of measurements of the next round may be determined based on how much difference between the measured value and the target value in step S330.

FIG. 4 is a view for explaining a method of shortening a compensation time, as shown in FIG. 4, when the difference between the measured value and the target value is smaller than the reference value in comparison with the first reference value set by the user (S450). S470), since it may be determined that the user is closer to the desired target value, the compensation time may be further shortened by increasing the accuracy by further increasing the interval between the number of measurements of the next round and the number of measurements of the previous order (S450). .

For example, after measuring four sets as one set, and then measuring 16 sets as one set, the compensation time can be further shortened.

If the measured value is greater than the first reference value in step S450 (S460), as shown in FIG. 3, the measurement value is gradually increased in order of one set of four times, one set of eight times, and one set of 16 times.

In the above, the first reference value set by the user means a set of different reference values corresponding to each measurement number. In other words, the increase in the number of measurements corresponding to one set means that the measurement value is getting closer to the target value, so that different reference values corresponding to each measurement number should be applied.

On the other hand, in the step (S350, S460, S470) of determining the number of times of measurement of the next round, the number of times of measurement of the next round is determined within a range not exceeding the final number of times of measurement inputted by the user or preset.

On the other hand, the result of the calibration and then the measured value is compared with the target value desired by the user, even if the target value is not reached even if it reaches a certain range within the second reference value that can be determined that the compensation was satisfactorily When the difference between the target value and the measured value falls within the second reference value, it may be terminated so as not to perform any further measurement and compensation process (S430).

In the present invention, in order to correct the uniformity of the display screen after repeatedly measuring and compensating using a two-dimensional luminance color coordinate measuring apparatus, time and economic efficiency can be improved by considering the number of measurements and the accuracy thereof. According to the above example, if it is assumed that it takes about 4 seconds to measure 16 sets in one set, the total time required for compensating by measuring 12 sets in total will be 48 seconds. The total time required for compensation is 4 seconds for 1 set of 4, 8 sets for 1 set of 4 sets, 16 sets of 1 set of 4 sets, and a total of 12 sets of compensation. In this case, the compensation time may be shortened, and in some cases (S470 of FIG. 4), the required time may be further shortened.

In the present specification, in the description of the embodiment, as described above, the number of measurements of the next order is designated as a specific multiple of the number of measurements of the previous order, but the present invention is not necessarily limited thereto. If not, the number of measurements of the next order may be set equal to or greater than the number of measurements of the previous order, and may be flexibly set to reduce the number of measurements of the next order depending on the difference between the target value and the measured value.

On the other hand, when the number of measurements is large, the accuracy increases, while the number of data bits that the data operation unit 214 needs to process also increases. When the number of measurements is economically reduced, the number of data bits that the data operation unit 214 needs to process also decreases. You lose. In this case, the operation speed for processing the data may be increased in the data operation unit 214, and as a result, the overall compensation time may be shortened.

In another embodiment of the present invention, the compensation time may be shortened by affecting the computational speed of the data computation unit 214 by adjusting the amount of data acquired by the measurement unit 212.

In the case of measuring using a two-dimensional luminance color coordinate measuring machine, the entire data of the CCD screen area is generally received and processed, and then the display screen area of the target sample is selected and displayed to the user. However, the area required by the user is determined before the sample is taken, that is, only the image of the display screen area is effectively used among the CCD screen area. Therefore, by first selecting and acquiring the necessary area for the user to perform the calculation, the data operation unit 214 processes the conventional method of outputting the required area after the user processes the entire area of the CCD screen. By reducing the amount of data to be reduced, the computation time is shortened, thereby reducing the overall measurement and compensation time.

The method of selectively acquiring is to perform pre-shooting once before starting to acquire the actual data, and then to inform the program of an area or point to be photographed based on this, and to obtain a target sample through image processing. There may be a way to allow only the area to be acquired by the program itself.

In FIG. 2, the data screening acquisition unit 116 selects only a portion of data received from the measurement unit 212 through an image processing and selectively captures only an area where a target sample is taken, or before photographing for obtaining actual data. After performing the operation once, the user notifies the program of an area or a point to be photographed based on this, and selectively acquires only an effective area and transmits it to the data operation unit 214. This shortens the time required for the calculation by reducing the amount of data to be processed by the data operation unit 214.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

210: measurement value acquisition unit 212: measurement unit
214: Data operation unit 216: Data screening acquisition unit
220: measurement frequency determination unit 230: screen data adjustment unit
240: input unit

Claims (17)

Acquiring a first measurement value of the image quality of the display apparatus by repeatedly measuring the display apparatus n times (where n is a natural number) using a two-dimensional image quality analyzer;
Comparing the first measured value with a target value and changing screen data of the display apparatus according to a comparison result; And
And repeatedly measuring the display device m times (where m is a natural number larger than n) using the two-dimensional image quality measuring device to obtain a second measurement value of the image quality of the display. The method of claim 1,
Wherein the first measurement value or the second measurement value is a luminance value of an image quality of the display device. The method of claim 1,
And the first measurement value or the second measurement value is a color coordinate value of the image quality of the display device. The method of claim 1,
And said m-th time is a multiple of said n-th time. The method of claim 1,
And the m-th time is determined according to the degree of difference between the first measured value and the target value. The method of claim 5,
And the m-th time when the difference value between the first measured value and the target value is smaller than the first reference value set by the user is greater than the m-th time when the difference value is larger than the first reference value. . The method of claim 1,
If the difference between the second measured value and the target value is less than or equal to a second reference value set by the user, ending the measurement of the display apparatus. The method of claim 1,
The acquiring of the first measurement value may include acquiring the first measurement value by selectively acquiring some data from data obtained by repeatedly measuring the display apparatus n times. A measurement value obtaining unit obtaining a measurement value of the image quality of the display apparatus by repeatedly measuring the display apparatus using a 2D image quality measuring instrument; And
Comprising a screen data change unit for comparing the measured value with a target value, the screen data of the display device according to the comparison result,
The measurement value obtaining unit obtains a first measurement value of the image quality of the display apparatus by repeatedly measuring n times (where n is a natural number) using the 2D image quality meter.
The data change unit compares the first measured value with a target value, and changes screen data of the display device according to a comparison result.
The measurement value obtaining unit obtains a second measurement value for the image quality of the display by repeatedly measuring the display device m times (where m is a natural number larger than n) by using the 2D image quality measuring instrument. . 10. The method of claim 9,
And the first measurement value or the second measurement value is a luminance value of the image quality of the display device. 10. The method of claim 9,
And the first measurement value or the second measurement value is a color coordinate value of the image quality of the display device. 10. The method of claim 9,
And said mth time is a multiple of said nth time. 10. The method of claim 9,
And the m-th time is determined according to the degree of difference between the first measured value and the target value. The method of claim 13,
And the m-th time when the difference value between the first measured value and the target value is smaller than the first reference value set by the user is greater than the m-th time when the difference value is larger than the first reference value. . 10. The method of claim 9,
And when the difference between the second measured value and the target value is less than or equal to a second reference value set by the user, ending the measurement of the display apparatus. 10. The method of claim 9,
And the measurement value acquisition unit includes a data selection acquisition unit configured to selectively acquire some data from data obtained by repeatedly measuring the display apparatus the nth time. The method of claim 10,
And an input unit configured to receive the target value, the first reference value, the second reference value, the nth or the last measurement number, and transmit the received value to the second measurement frequency determiner.

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