Method of measuring light characteristics of display device

Abstract

The method of measuring a light characteristic of a display device includes: measuring the light characteristic of a measurement target area of the display device using a measurement device having a higher resolution than a resolution of the display device; determining an appropriate window for the target area; repeatedly changing a position of the appropriate window within the target area; calculating, for each position of the appropriate window, an average value of light characteristics within the appropriate window; and averaging the plurality of average values of the light characteristics within the appropriate window, and determining an average light characteristic value of the measurement target region.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a method of measuring light characteristics of a display device. BACKGROUND

[0002] A display device is a device that provides visual information such as an image to a user, and is used in various electronic devices such as a computer, a television, a game device, and a smart phone.

[0003] A smart phone is generally equipped with a camera, and to increase the screen size, a display under camera ("UDC") or under panel camera ("UPC") technology that uses an area where a camera is placed as a screen is used. In this technology, a pixel arrangement or a wiring structure of an area where a camera is placed, that is, a camera area, can be different from that of the remaining area. In this case, the camera area can have different light characteristics (or light features) such as luminance and chromaticity from the remaining area. In other words, the camera area and the remaining area can display different luminance and chromaticity for the same display signal. Accordingly, the display signal supplied to the camera area can be appropriately corrected so that an intended image can be appropriately displayed. SUMMARY

[0004] One problem that the present disclosure aims to solve is to more accurately measure light characteristics of a display device. Another problem that the present disclosure aims to solve is to more accurately measure light characteristics of an area of a display device having a heterogeneous structure and more accurately display an intended image in the area.

[0005] In an embodiment of the present disclosure, a method of measuring light characteristics of a display device includes measuring the light characteristics of a measurement target area of the display device using a measurement device having a higher resolution than a resolution of the display device; determining an appropriate window for a target area; repeatedly changing a position of the appropriate window within the target area; calculating an average value of light characteristics within the appropriate window for each position of the appropriate window; and averaging a plurality of the average values of the light characteristics within the appropriate window and determining an average light characteristic value of the measurement target area.

[0006] In an embodiment of the present disclosure, the appropriate (or suitable) window can be a rectangle.

[0007] In an embodiment of the present disclosure, the measurement target area of the display device has a structure in which a repetitive unit is repeated, and a size of the appropriate window can be a multiple of a size of the repetitive unit.

[0008] In embodiments of the present disclosure, the determining the proper window includes setting a plurality of temporary windows of different sizes for the target region, repeatedly changing a position within the target region of each of the plurality of temporary windows, calculating an average of an intra-window light feature within each of the plurality of temporary windows for each position of each of the plurality of temporary windows, comparing the average of the intra-window light feature for each of the plurality of temporary windows, and as a result of the comparing the average of the intra-window light feature, determining a standard deviation of the average of the intra-window light feature to be the smallest among the plurality of temporary windows, calculating the standard deviation of the average of the intra-window light feature within each of the plurality of temporary windows for each of the plurality of temporary windows, comparing a plurality of the standard deviations, and as a result of the comparing the standard deviations, determining the temporary window having the smallest standard deviation among the plurality of temporary windows as the proper window.

[0009] In embodiments of the present disclosure, the setting the plurality of temporary windows of different sizes can include setting an initial window among the plurality of temporary windows, and then setting other temporary windows by gradually reducing a size of the initial window.

[0010] In embodiments of the present disclosure, the setting the initial window can include setting the size of the initial window to be about 1 / 3 to about 1 / 2 of a size of the target region.

[0011] In embodiments of the present disclosure, the setting the initial window can include setting the initial window to be a square shape.

[0012] In embodiments of the present disclosure, the setting the different temporary windows can include setting a plurality of first temporary windows by gradually reducing the size of the initial window in a first direction, and setting a plurality of second temporary windows by gradually reducing the size of the initial window in a second direction perpendicular to the first direction.

[0013] In embodiments of the present disclosure, the determining the proper window includes setting an initial window for the target area, setting a plurality of first temporary windows including the initial window by gradually reducing a size of the initial window in a first direction, and repeatedly changing a position of each of the plurality of first temporary windows within the target area, calculating an average of in-window light features within each of the plurality of first temporary windows for each position of each of the plurality of first temporary windows, calculating a standard deviation of the average of the in-window light features within each of the plurality of first temporary windows for each of the plurality of first temporary windows, comparing a plurality of the standard deviations of the plurality of first temporary windows, and as a result of the comparing the standard deviations of the plurality of first temporary windows, determining a first temporary window having a smallest standard deviation among the plurality of first temporary windows as a temporary window, establishing a plurality of second temporary windows including the temporary window by gradually reducing a size of the temporary window in a second direction perpendicular to the first direction, repeatedly changing a position of each of the plurality of second temporary windows within the target area, and calculating an average of the in-window light features within each of the plurality of second temporary windows for each position of each of the plurality of second temporary windows, calculating a standard deviation of the average of the in-window light features within each of the plurality of second temporary windows for each of the plurality of second temporary windows, comparing a plurality of the standard deviations of the plurality of second temporary windows, and as a result of the comparing the standard deviations of the plurality of second temporary windows, determining a second temporary window having a smallest standard deviation among the plurality of second temporary windows as the proper window.

[0014] In embodiments of the present disclosure, the setting the initial window can include setting the size of the initial window to be about 1 / 3 to about 1 / 2 of a size of the target area.

[0015] In embodiments of the present disclosure, the setting the initial window can include setting the initial window to be a square shape.

[0016] In embodiments of the present disclosure, the measurement target area of the display device displays an image together with a remaining area of the display device, and the measurement target area of the display device and the remaining area have different pixel arrangements or different wiring structures.

[0017] In embodiments of the present disclosure, the light features can include at least one of luminance and chrominance.

[0018] In an embodiment of the disclosure, a method of operating an indication device includes determining an average value of a light feature of a first region of an indication device comprising the first region and a second region narrower than the first region; measuring the light feature of the second region with a measuring device having a higher resolution than the indication device; and determining an appropriate window for a target region of the measuring device corresponding to the second region; repeatedly changing a position of the appropriate window within the target region; calculating an average value of a light feature within the appropriate window for each position of the appropriate window; averaging a plurality of the average values of the light feature within the appropriate window to determine an average value of the light feature of the second region; and calibrating an indication signal supplied to the second region based on a difference between the average value of the light feature of the first region and the average value of the light feature of the second region.

[0019] In an embodiment of the disclosure, the first region and the second region together display an image, and the second region can have a different pixel arrangement or a different wiring structure from the first region.

[0020] In an embodiment of the disclosure, the appropriate window can be a rectangle.

[0021] In an embodiment of the disclosure, the determining the appropriate window includes setting a plurality of temporary windows of different sizes for the target region; repeatedly changing a position of each of the plurality of temporary windows within the target region; calculating an average value of a window- within light feature within each of the plurality of temporary windows for each position of each of the plurality of temporary windows; comparing the average values of the window- within light feature for each of the plurality of temporary windows, and as a result of the comparison, determining that a standard deviation of the average values of the window- within light feature is smallest among the plurality of temporary windows; calculating the standard deviation of the average values of the window- within light feature within each of the plurality of temporary windows for each of the plurality of temporary windows; comparing a plurality of the standard deviations; and as a result of the comparing the standard deviations, determining a temporary window having a smallest standard deviation among the plurality of temporary windows as the appropriate window.

[0022] In an embodiment of the disclosure, the determining the proper window includes setting an initial window for the target area, setting a plurality of first temporary windows including the initial window by gradually reducing a size of the initial window in a first direction and repeatedly changing a position of each of the plurality of first temporary windows within the target area, calculating an average of in-window light features within each of the plurality of first temporary windows for each position of each of the plurality of first temporary windows, calculating a standard deviation of the average of the in-window light features within each of the plurality of first temporary windows for each of the plurality of first temporary windows, comparing a plurality of the standard deviations of the plurality of first temporary windows, and as a result of the comparing the standard deviations of the plurality of first temporary windows, determining a first temporary window having a minimum standard deviation among the plurality of first temporary windows as a temporary window, establishing a plurality of second temporary windows including the temporary window by gradually reducing the size of the temporary window in a second direction perpendicular to the first direction, repeatedly changing a position of each of the plurality of second temporary windows within the target area, and calculating an average of in-window light features within each of the plurality of second temporary windows for each position of each of the plurality of second temporary windows, calculating a standard deviation of the average of the in-window light features within each of the plurality of second temporary windows for each of the plurality of second temporary windows, comparing a plurality of the standard deviations of the plurality of second temporary windows, and as a result of the comparing the standard deviations of the plurality of second temporary windows, determining a second temporary window having a minimum standard deviation among the plurality of second temporary windows as the proper window.

[0023] In an embodiment of the disclosure, the setting the initial window can include setting the size of the initial window to be about 1 / 3 to about 1 / 2 of a size of the target area.

[0024] In an embodiment of the disclosure, the setting the initial window can include setting the initial window to be a square shape.

[0025] By doing so, the light features of the display apparatus can be more accurately measured. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and other embodiments, advantages, and features of the present disclosure will become more apparent by describing in further detail embodiments thereof with reference to the attached drawings, in which:

[0027] Figure 1 is a schematic diagram illustrating an embodiment of a method of measuring light features of a display apparatus according to the present disclosure.

[0028] Figures 2 to 4 is a diagram illustrating an embodiment of a window according to various embodiments of the present disclosure.

[0029] Figure 5 FIG. 6 is a flowchart illustrating an embodiment of a method of measuring light characteristics of a display apparatus according to the present disclosure.

[0030] Figures 6 to 8 FIG. 7 is a schematic diagram for explaining an embodiment of a method of measuring light characteristics of a display apparatus according to the present disclosure. DETAILED DESCRIPTION

[0031] A method for measuring light characteristics of a display apparatus according to various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings such that those skilled in the art can easily perform the method. The present disclosure can be implemented in various different embodiments and is not limited to the embodiments described herein.

[0032] For clarity of the various components and parts in the drawings, the sizes are exaggerated or reduced. When a part (or component) is referred to as being "on" another part (or component), it can be directly on the other part (or component) or an intervening part (or component) can be present. Conversely, when a part (or component) is referred to as being "directly on" another part (or component), it means that there is no intervening part (or component) between the part (or component) and the other part (or component).

[0033] In the present specification, terms such as "first" and "second" are used as modifiers of nouns, but unless explicitly defined, they are based only on the order of description and do not have any type of (e.g., spatial, temporal, or logical) arrangement. In addition, in two or more drawings, parts or components having the same or similar functions can be indicated by the same reference numerals. However, this is only for the purpose of simplifying the illustration and explanation, and does not mean that the parts or components indicated by the same reference numerals are exactly the same in structure and function in all embodiments.

[0034] "About" or "approximately," as used herein, includes the recited value and means within an acceptable range of deviation of the particular value as determined by one of ordinary skill in the art via the exercise of ordinary techniques. For example, "about" can mean within one or more standard deviations, or within ± 30%, ± 20%, ± 10%, or ± 5% of the recited value.

[0035] Unless otherwise stated, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Unless otherwise defined, the general terms used herein are to be interpreted in the meaning as used in the relevant technical field or as given in a dictionary, and are not to be interpreted in an overly narrow or formal sense.

[0036] First, a method for measuring a light characteristic of a display device according to an embodiment of the disclosure will be described with reference to FIG. 1. Figure 1 A method for measuring a light characteristic of a display device in an embodiment of the disclosure will be described in detail.

[0037] Figure 1 is a schematic diagram showing an embodiment of a method for measuring a light characteristic of a display device according to the disclosure.

[0038] Referring to FIG. 1, Figure 1 First, a light characteristic is measured using a measurement device 20 (such as a camera) capable of two-dimensional measurement over the entire area of the display device 10 or a portion of the display device 10 including a measurement target area 14.

[0039] In the display device 10, the pixels of the measurement target area 14 can form a picture of the display device 10 together with the pixels of the remaining area 12, but the pixels of the measurement target area 14 can have a different structure, such as a different pixel arrangement or a different wiring structure, from the pixels of the remaining area 12. For example, as in the case of a smart phone, the measurement target area 14 can be a camera area where a camera is placed.

[0040] The measurement device 20 can have a higher resolution than the display device 10, and thus, a plurality of pixels of the measurement device 20 can correspond to one pixel of the display device 10. In an embodiment, the light characteristic to be measured includes luminance and chrominance. Here, luminance is first explained as an example.

[0041] Next, a window 26 as a reference area for measurement is set within a target area 24 of the measurement device 20 corresponding to the measurement target area 14 of the display device 10. In an embodiment of the disclosure, the window 26 can be a quadrilateral, for example, a rectangle (for example, a square).

[0042] By changing the position of the window 26 within the target area 24 and calculating the average luminance of each position of the window 26, the average luminance of the target area 24 (i.e., the average luminance of the measurement target area 14) is determined by summing the average luminance obtained for each position of each window 26 and dividing by the number of windows 26 to average them.

[0043] Next, a method for determining a window in an embodiment of the disclosure will be described with reference to FIG. 2. Figures 2 to 4 A method for determining a window in an embodiment of the disclosure will be described in detail.

[0044] Figures 2 to 4 is a diagram showing an embodiment of a window according to various embodiments of the present disclosure.

[0045] As described previously, according to the present disclosure, the shape of the window 26 can be a quadrangle, for example, a rectangle (for example, a square). When the shape of the window 26 is a circle instead of a square, there can be many cases in which the boundary of the window 26 passes through the middle of a pixel (hereinafter referred to as "display pixel") of the display device 10 (see FIG. 1). Because the positional relationship between the boundary of the window 26 and the display pixel changes when the position of the window 26 changes, an error in the measured luminance between the windows 26 can increase. In particular, as the size of the measurement target region 14 (see FIG. 1) or the size of the window 26 decreases, such an error can become large. Figure 1 Figure 1

[0046] In embodiments of the present disclosure, the size of the window 26 can be set to a size that is a multiple of the smallest repeating unit of the pixel array of the display device 10. In embodiments, for example, in the case of the diamond Figure 2 and Figure 3 arrangement shown in FIGS. 1 and 2, the red sub-pixel and the green sub-pixel form one pixel (that is, a red-green pixel), and the blue sub-pixel and the green sub-pixel form one pixel (that is, a blue-green pixel), and the red-green pixels and the blue-green pixels are arranged alternately.

[0047] Therefore, two pixels adjacent to each other (that is, a red-green pixel and a blue-green pixel adjacent to each other) form the smallest repeating unit. Therefore, when the window 26 is set to a size equal to a multiple of the smallest repeating unit, the number of each sub-pixel remains unchanged even when the position of the window 26 changes.

[0048] Figure 2 The window 26 shown in FIG. 3 can include 18 repeating units. In this case, the number of sub-pixels does not change regardless of where the window 26 is disposed. In embodiments, for example, the upper window WD11 and the lower window WD12 each include 18 red sub-pixels, 18 blue sub-pixels, and 36 green sub-pixels.

[0049] Figure 3 The size of the window 26 shown in FIG. 4 is not set to a multiple of the smallest repeating unit.

[0050] ​​​In this case, the number of each sub-pixel can vary based on the position of the window 26. In an embodiment, for example, the upper window WD21 and the lower window WD22 are the same size, but the upper window WD21 includes 25 red sub-pixels, 24 blue sub-pixels, and 36 green sub-pixels, while the lower window WD22 includes 18 red sub-pixels, 18 blue sub-pixels, and 49 green sub-pixels. In this way, as the number of each sub-pixel within the window 26 changes, the bias in the average luminance within the window 26 can also increase.

[0051] The measurement can be performed with the measurement device 20 not aligned with the display device 10, but at an angle. As shown in FIG. 3B, in this case the window WD31 can be equivalent to the window WD32 after rotation in the aligned case, in which case the rotation of the window WD32 can cancel out the type and number of sub-pixels excluded from the new window WD31 with the type and number of sub-pixels added to the new window WD31. Figure 4

[0052] Finally, in this case, the number of each sub-pixel within the windows WD31 and WD32 remains the same.

[0053] Now, the method for measuring the light characteristics of a display device according to the present disclosure will be described in detail with reference to the accompanying drawings. Figures 1 to 3 Figures 5 to 8 The method for measuring the light characteristics of a display device according to the present disclosure will be described in detail with reference to the accompanying drawings.

[0054] Figure 5 is a flowchart showing an embodiment of a method of measuring light characteristics of a display device according to the present disclosure, and Figures 6 to 8 is a schematic diagram for explaining an embodiment of a method of measuring light characteristics of a display device according to the present disclosure.

[0055] In an embodiment of the present disclosure, the method for measuring the light characteristics of a display device involves determining the light characteristics (luminance or chrominance) of the measurement target region 14 based on information measured by photographing a region including the measurement target region 14 in the display device 10 with the measurement device 20. First, a window of an appropriate size that can minimize errors is determined, and then the average light characteristics within the window are calculated while moving the window, and these light characteristics are averaged to determine the final light characteristics.

[0056] The window size determination process will be described in detail.

[0057] ​​First, an initial size (i.e., initial side length) of the window 26 is set (operation 512). In the target region 24, there can be two or more (typically several to several tens of repeating units of marked pixels), and thus the initial window 26 can be set to a square having each side of which is about 1 / 3 to about 1 / 2 of the diameter of the target region 24. Assuming that the target region 24 is substantially small and consists of only two repeating units, the initial size of the window 26 can be set to be slightly larger than about 1 / 2 of the diameter of the target region 24. In an embodiment, for example, when the diameter of the target region 24 is 100 pixels based on the measurement device 20, the initial size (i.e., initial side length) of the window 26 can be set to a size slightly larger than 50 pixels (e.g., 55 pixels).

[0058] As the initial window 26 determined in this way moves within the target region 24, an average light feature (e.g., average brightness) within the window 26 is calculated at each point. At this time, the movement of the window 26 can be divided into movement in the horizontal direction and movement in the vertical direction.

[0059] In an embodiment, for example, with reference to Figure 6 The initial window 26 is applied to the left end of the target region 24 and the average brightness within the window 26 is calculated (operation 514). The window 26 can then be moved slightly to the right (e.g., by a size of one pixel of the measurement device 20). After the average brightness within the moved window 26 is calculated, the window 26 is moved again in the same way and the average brightness is calculated. In this way, as Figure 7 indicated in the above-described embodiment, the average brightness calculation (operation 516) can be repeated until the window 26 reaches the right end of the target region 24.

[0060] The standard deviation of the average brightness within the window 26 calculated in this way is calculated (operation 518), and is stored as the minimum value of the standard deviation together with the size of the window 26. The size of the window can be expressed with a horizontal length and a vertical length.

[0061] Next, a new window 26 can be set, the horizontal length of which is slightly reduced from the horizontal length of the initial window 26 (e.g., by a size of one pixel of the measurement device 20) (operation 526). The above-described average brightness calculation process can be repeated for the newly set window 26, and the standard deviation of the average brightness within the new window 26 can be calculated (operations 514 to 518). Figure 8The average luminance within the window 26 at each position is illustratively shown for windows 26 having different horizontal lengths. This standard deviation is compared with a minimum value of the previously stored standard deviations (operation 520), and when this standard deviation is smaller than the minimum value, the minimum value is updated with the new (this) standard deviation, and the horizontal length of the window 26 is also updated (operation 522). When the calculated (this) standard deviation is larger than the minimum value, the processing proceeds to the next processing. In the present description, the window 26 having a size different from each other can be referred to as a temporary window, and the light feature for each position of each of the plurality of temporary windows can be referred to as a window- within light feature.

[0062] This repeated calculation can be performed a predetermined number of times. As shown earlier, when the target region 24 includes two repeating units and the diameter of the target region 24 is about 100 pixels, the repeated calculation can be performed, for example, in a range of about 45 pixels to about 55 pixels of the horizontal length of the window. In an embodiment, when the initial horizontal length of the window 26 is set to 55 pixels, the repeated calculation can be performed, for example, by reducing the horizontal length of the window 26 until the horizontal length of the window 26 becomes about 45 pixels. When there is no information about the relationship between the target region 24 and the repeating unit, the calculation can be repeated the initial width of the window minus 1 time.

[0063] When the processing of reducing the horizontal length of the window 26 and repeating the calculation is completed (YES in operation 524), the horizontal length of the window 26 can be fixed to the stored value, and the change of the vertical length of the window 26 and the calculation of the light feature can be performed in the same manner as in the horizontal direction.

[0064] That is, the average luminance within the window 26 at the initial vertical position can be calculated (operation 528), the average luminance within the window 26 at each position while moving the window 26 in the vertical direction can be calculated (operation 530), and then the standard deviation of the average luminance within the window 26 can be calculated (operation 532). The standard deviation from the first test can be stored as a minimum value of the standard deviations, and in the subsequent test, the calculated standard deviation can be compared with the stored minimum value of the standard deviations (operation 534), and when the calculated standard deviation is smaller than the minimum value, the minimum value can be updated to the new standard deviation, and the vertical length of the window 26 can also be updated (operation 536).

[0065] When the repetitive processing of changing the position and calculating the vertical length of the window 26 is completed ("Yes" in operation 538), the stored size of the window 26 (i.e., the horizontal length and the vertical length) becomes the appropriate size of the window 26, and the saved (stored) window length and average result are reported (operation 542). When the repetitive processing of changing the position and calculating the vertical length of the window 26 is not completed ("No" in operation 538), the size of the window 26 in the vertical direction is reduced (operation 540).

[0066] Therefore, for the determined appropriate window 26, by changing its position within the target region 24 in the horizontal direction and the vertical direction, and calculating the average luminance within the window 26 at each position, the final average luminance of the target region 24 can be determined by again averaging the values of these average luminances.

[0067] At this time, the position change of the appropriate window 26 can be performed in accordance with the position change when the above-described standard deviation is calculated (operation 516 and operation 530). Further, since the vertical position of the appropriate window 26 is changed and the average luminance within the window 26 is calculated when the standard deviation is calculated, the values calculated at that time can be saved and used. The position change of the appropriate window 26 can be performed in only one direction (e.g., vertically), and in this case, the values calculated during the standard deviation calculation can be stored and used without additional processing.

[0068] In this way, the average luminance calculated by setting and moving the appropriate window 26 for the target region 24 in the measurement device 20 can be determined as the average luminance of the measurement target region 14 of the display device 10.

[0069] The average luminance of the measurement target region 14 can be compared with the luminance of the remaining region 12 within the display device 10, and by correcting the display signal applied to the measurement target region 14 based on the difference, the correction can be more accurately performed.

[0070] Although the embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not limited to this, and various modifications and improvements made by those skilled in the art using the basic concept of the present disclosure defined in the attached claims are also possible.

Claims

1. A method for measuring the optical properties of a display device, wherein, The method includes: The optical properties of the target area of ​​the display device are measured using a measuring device with a resolution higher than that of the display device. Determine an appropriate window for the target area of ​​the measuring device corresponding to the target area of ​​the measurement target region; Repeatedly change the position of the appropriate window within the target area; Calculate the average value of the light characteristics within the appropriate window for each location of the appropriate window; and The average of the multiple average values ​​of the light properties within the appropriate window is calculated, and the average light property value of the measurement target area is determined.

2. The method for measuring the optical properties of the display device according to claim 1, wherein: The appropriate window is rectangular.

3. The method for measuring the optical properties of the display device according to claim 2, wherein: The measurement target area of ​​the display device has a structure in which repeating units are repeated. The appropriate window size is a multiple of the size of the repeating unit.

4. The method for measuring the optical properties of the display device according to claim 2, wherein: Determining the appropriate window includes: Multiple temporary windows of different sizes are set for the target area; Repeatedly change the position of each of the plurality of temporary windows within the target area; For each of the plurality of temporary windows, calculate the average value of the light characteristics within each of the plurality of temporary windows at each position; For each of the plurality of temporary windows, calculate the standard deviation of the average value of the light properties within each of the plurality of temporary windows; Compare multiple of the stated standard deviations; and As a result of the comparison of the standard deviations, the temporary window with the smallest standard deviation among the plurality of temporary windows is determined as the appropriate window.

5. The method for measuring the optical properties of the display device according to claim 4, wherein: The setting of the plurality of temporary windows of different sizes includes: Set the initial window among the plurality of temporary windows; and Gradually reduce the size of the initial window to set other temporary windows.

6. The method for measuring the optical properties of the display device according to claim 5, wherein: Setting the initial window includes setting the size of the initial window to 1 / 3 to 1 / 2 of the size of the target area.

7. The method for measuring the optical properties of the display device according to claim 5, wherein: Setting the initial window includes setting the initial window to a square shape.

8. The method for measuring the optical properties of the display device according to claim 5, wherein: The setting of the other temporary windows includes: Multiple first temporary windows are set by gradually decreasing the size of the initial window in a first direction; and Multiple second temporary windows are set by gradually reducing the size of the initial window in a second direction perpendicular to the first direction.

9. The method for measuring the optical properties of the display device according to claim 2, wherein: Determining the appropriate window includes: Set an initial window for the target area; A plurality of first temporary windows, including the initial window, are set by gradually reducing the size of the initial window in a first direction; The position of each of the plurality of first temporary windows within the target area is repeatedly changed; For each of the plurality of first temporary windows, calculate the average value of the light characteristics within each of the plurality of first temporary windows at each position; For each of the plurality of first temporary windows, calculate the standard deviation of the average value of the light properties within each of the plurality of first temporary windows; Compare the standard deviations of the plurality of first temporary windows; As a result of comparing the standard deviations of the plurality of first temporary windows, the first temporary window with the smallest standard deviation among the plurality of first temporary windows is determined as the temporary window; A plurality of second temporary windows, including the temporary window, are set by gradually decreasing the size of the temporary window in a second direction perpendicular to the first direction; The position of each of the plurality of second temporary windows within the target area is repeatedly changed; For each of the plurality of second temporary windows, calculate the average value of the light characteristics within each of the plurality of second temporary windows at each position; For each of the plurality of second temporary windows, calculate the standard deviation of the average value of the light properties within each of the plurality of second temporary windows; Compare the multiple standard deviations of the multiple second temporary windows; and As a result of comparing the standard deviations of the plurality of second temporary windows, the second temporary window with the smallest standard deviation among the plurality of second temporary windows is determined as the appropriate window.

10. The method for measuring the optical properties of the display device according to claim 9, wherein: Setting the initial window includes setting the size of the initial window to 1 / 3 to 1 / 2 of the size of the target area.

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