Optical Detection Device and Method for Detecting a Display Panel

Abstract

The present disclosure provides an optical detection device and method for detecting a display panel. The device includes photosensitive units arranged in an array; the distance between opposite sides of adjacent photosensitive units is less than the sub-pixel size of the display panel, and the photosensitive units in adjacent rows have a position offset in a first direction, and the offset distance corresponding to the position offset is less than the sub-pixel size of the display panel.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and in particular, to an optical detection device and method for detecting a display panel. Background Art

[0002] In the entire production process of a display screen, optical detection is an essential detection process. Common optical detection devices are composed of photosensitive devices such as charge-coupled devices (CCDs), complementary metal-oxide-semiconductor (CMOS), and photodiodes (PINs). However, limited by the process limitations of photosensitive devices and the size limitations of drive circuits, there are certain limitations on the minimum size of a single photosensitive device. The size of the photosensitive device determines the minimum resolution of the optical detection device. The smaller the minimum resolution, the higher the detection accuracy for the detailed topography of an object, resulting in a greater impact on the detection accuracy by the photosensitive device. Summary of the Invention

[0003] Embodiments of the present disclosure provide an optical detection device and method for detecting a display panel.

[0004] In a first aspect of embodiments of the present disclosure, there is provided an optical detection device for detecting a display panel, including photosensitive units arranged in an array; the distance between opposite sides of adjacent photosensitive units is less than the sub-pixel size of the display panel, and adjacent rows of photosensitive units have a position offset in a first direction, and the offset distance corresponding to the position offset is less than the sub-pixel size of the display panel.

[0005] In a second aspect of embodiments of the present disclosure, there is provided a method for detecting a display panel using the optical detection device, including:

[0006] Determining a moving route of the display panel according to the size relationship between the optical detection device and the display panel;

[0007] Controlling the optical detection device to collect picture information of the display panel at a first position;

[0008] Controlling the display panel to move a first distance along the moving route and controlling the optical detection device to collect the picture information of the display panel again;

[0009] Repeating the previous step until the collected picture information can jointly cover the entire picture of the display panel; and

[0010] Optically detecting the display panel based on the collected picture information.

[0011] The optical detection device and method for detecting a display panel provided by an embodiment of the present disclosure can achieve optical detection with sub-pixel accuracy compared to conventional devices such as line array cameras. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the following will briefly introduce the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings in the following description are only embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1A FIG. 9 shows an exemplary structural schematic diagram of the optical detection device 100 provided by an embodiment of the present disclosure.

[0014] Figure 1B FIG. 13 shows another exemplary structural schematic diagram of the optical detection device 100 provided by an embodiment of the present disclosure.

[0015] Figure 1C FIG. 17 shows yet another exemplary structural schematic diagram of the optical detection device 100 provided by an embodiment of the present disclosure.

[0016] Figure 2 FIG. 21 shows a schematic flowchart of an exemplary method provided by an embodiment of the present disclosure.

[0017] Figure 3A FIG. 25 shows an exemplary schematic diagram of the optical detection of a display panel by the device according to an embodiment of the present disclosure.

[0018] Figure 3B FIG. 29 shows another exemplary schematic diagram of the optical detection of a display panel by the device according to an embodiment of the present disclosure.

[0019] Figure 3C FIG. 33 shows yet another exemplary schematic diagram of the optical detection of a display panel by the device according to an embodiment of the present disclosure.

[0020] Figure 3D FIG. 37 shows still another exemplary schematic diagram of the optical detection of a display panel by the device according to an embodiment of the present disclosure.

[0021] Figure 3E FIG. 41 shows another exemplary schematic diagram of the optical detection of a display panel by the device according to an embodiment of the present disclosure.

[0022] Figure 3F FIG. 45 shows yet another exemplary schematic diagram of the optical detection of a display panel by the device according to an embodiment of the present disclosure.

[0023] Figure 4Another exemplary schematic diagram shows an optical detection of a display panel by a device according to an embodiment of the present disclosure.

[0024] Figure 5A A schematic diagram shows a partial acquisition area of a photosensitive unit and a distribution of areas therein during detection according to an embodiment of the present disclosure.

[0025] Figure 5B Another schematic diagram shows a partial acquisition area of a photosensitive unit and a distribution of areas therein during detection according to an embodiment of the present disclosure. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the present disclosure more clear and understandable, the present disclosure will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0027] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The terms "first", "second", and similar terms used in the embodiments of the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0028] In some scenarios, a display panel is composed of a large area of massive MicroLEDs transferred on a glass substrate backplane. To ensure the display effect, it is necessary to perform a full backplane detection on such a display panel, and a detection accuracy of 1 micrometer (μm) or even smaller needs to be achieved. However, limited by the process limitations of photosensitive devices and the size limitations of driving circuits, the minimum size of a single photosensitive device has certain limitations, resulting in the minimum accuracy of common area array cameras and line array cameras usually being in the order of several micrometers (μm). To achieve a detection accuracy of less than 1 μm, an enlarging lens needs to be used. However, due to the limitation of the field of view (FOV) of the optical system of the enlarging lens, to achieve a full backplane detection, the number of photos to be taken is large and the time is long, which cannot meet the requirements of mass production.

[0029] In view of this, embodiments of the present disclosure provide an optical detection device and method for detecting a display panel. The device includes photosensitive units arranged in an array; the distance between opposite sides of adjacent photosensitive units is less than the sub-pixel size of the display panel, and adjacent rows of photosensitive units have a position offset in a first direction, and the offset distance corresponding to the position offset is less than the sub-pixel size of the display panel. The method includes: determining a moving route of the optical detection device according to the size relationship between the optical detection device and the display panel; controlling the optical detection device to collect picture information of the display panel at a first position; controlling the optical detection device to move a first distance along the moving route at a first moving speed and collect the picture information of the display panel again; repeating the previous step until the collected picture information can jointly cover the complete picture of the display panel; and performing optical detection on the display panel based on the collected picture information.

[0030] The optical detection device and method for detecting a display panel provided by embodiments of the present disclosure can achieve optical detection with sub-pixel accuracy compared with conventional devices such as linear array cameras.

[0031] Figure 1A FIG. 7 shows an exemplary structural schematic diagram of an optical detection device 100 provided by an embodiment of the present disclosure.

[0032] As Figure 1A shown, the device 100 may include a substrate 102 and photosensitive units 104 arranged in an array on the substrate 102.

[0033] In some embodiments, as Figure 1A shown, the distance L2 between opposite sides of adjacent photosensitive units 104 is less than the sub-pixel size of the display panel to be measured, so that the arrangement of the photosensitive units 104 is relatively compact, which is beneficial to improving the detection accuracy. In some embodiments, as Figure 1A shown, adjacent photosensitive units may refer to photosensitive units 104 adjacent in a first direction 106 and photosensitive units 104 adjacent in a second direction 108, where the first direction 106 and the second direction 108 are perpendicular to each other. For example, as Figure 1A shown, the first direction 106 may refer to the row direction of the photosensitive units 104 arranged in an array, and the second direction 108 may refer to the column direction of the photosensitive units 104 arranged in an array. Thus, as Figure 1A shown, in this embodiment, the distance L2 between opposite sides of adjacent photosensitive units 104 may refer to the distance between opposite sides of adjacent photosensitive units 104 in the row direction and the distance in the column direction.

[0034] In some embodiments, as Figure 1AAs shown, the photosensitive units 104 of adjacent rows have a position offset in the first direction 106, and the offset distance L3 corresponding to this position offset is less than the sub-pixel size of the display panel to be measured. In this way, when the optical detection device 100 moves along the second direction 108, due to the offset less than the sub-pixel size between adjacent rows of photosensitive units, when adjacent rows move to the position of the current row, the detection areas of the photosensitive units have an offset of the offset distance L3. Thus, based on this offset distance L3, sub-pixel-level detection accuracy in the first direction 106 can be achieved, that is, the detection accuracy can reach the sub-pixel level, for example, 1μm.

[0035] Generally, a pixel of a display panel is composed of sub-pixels of multiple colors (for example, red sub-pixels, blue sub-pixels, green sub-pixels, etc.), so that a single pixel can achieve full-color lighting. Therefore, it can be understood that the sub-pixel size is the general size of the sub-pixel, usually in the micron range, for example, less than or equal to 1μm.

[0036] In some embodiments, as Figure 1A shown, the pitch L1 between adjacent photosensitive units 104 can be N times the distance L2 between the opposite sides of adjacent photosensitive units 104, and N can be an integer greater than or equal to 2. In this way, when the photosensitive unit 104 moves along the first direction 106 or the second direction 108, it can move in units of the distance L2, so that after moving N times, a length of L1 can be repeated, enabling a detection accuracy of L1 / N in the moving direction. In some embodiments, the pitch L1 can refer to the distance between the center points of adjacent photosensitive units 104.

[0037] In some embodiments, as Figure 1A shown, the pitch L1 between adjacent photosensitive units 104 can be M times the offset distance L3, and M can be an integer greater than or equal to 2. In this way, assuming that the device 100 moves along the second direction 108 in units of the offset distance L3, after moving M times, a length of L1 can be repeated, enabling a detection accuracy of L1 / M in the first direction 106.

[0038] In some embodiments, for the convenience of detection, as Figure 1A shown, the length and width of the photosensitive unit 104 can be equal, and the distance L2 between the opposite sides of adjacent photosensitive units 104 and the offset distance L3 can be equal. Correspondingly, N and M in the foregoing embodiments can also be equal. In some embodiments, the size of each photosensitive unit 104 is the same, and the length and width of each photosensitive unit 104 are both equal, that is, the photosensitive unit 104 is square.

[0039] In some embodiments, asFigure 1A As shown, the length L4 of one row of photosensitive units 104 is greater than the side length of at least one side of the display panel to be measured. For example, assuming that the length L4 is greater than the long side of the display panel, by moving the device 100 a certain number of times along the short side direction of the display panel, the entire display panel can be covered, and thus a complete picture of the display panel can be acquired. In this way, it is not necessary to move the display panel along the long side direction of the display panel to acquire a complete picture of the display panel, that is to say, moving the device 100 in one direction can complete the acquisition of a complete picture of the display panel, that is, full backplane detection can be achieved.

[0040] In some embodiments, the length L4 of one row of photosensitive units 104 can be at least greater than the sum of the side length of at least one side of the display panel to be measured and the pitch L1 between adjacent photosensitive units 104. In this way, when the initial relative position between the display panel and the photosensitive unit array is appropriate, during the process of the display panel moving in a straight line, each row of photosensitive units can cover both edges of the display panel to be measured, so that richer optical data can be acquired, and thus a better detection result can be calculated.

[0041] Figure 1B Another exemplary structural diagram of the optical detection device 100 provided by an embodiment of the present disclosure is shown. As Figure 1B shown, in some embodiments, n rows of photosensitive units 104 can be taken as a group, and the photosensitive units 104 in each group are arranged in parallel along the second direction 108. By increasing the number of photosensitive units, the detection area of the device 100 is larger, the number of movements can be relatively reduced, and the detection efficiency can be improved.

[0042] In some embodiments, n is an integer greater than or equal to 2. In a group of photosensitive units 104, the photosensitive units 104 in adjacent rows have a position offset L3 in the first direction 106, and the photosensitive units 104 in adjacent groups do not have a relative position offset as a whole. For example, as Figure 1B shown, the optical detection device 100 includes a photosensitive unit group t1 and a photosensitive unit group t2. Among them, the photosensitive unit group t1 and the photosensitive unit group t2 are arranged in parallel, and there is no relative position offset between them as a whole, that is, the corresponding rows in each group are flush, that is, the initial positions of the corresponding rows in each group of photosensitive units are the same. As Figure 1B shown, the first row of the photosensitive unit group t1 and the first row of the photosensitive unit group t2 are aligned. Similarly, as Figure 1B shown, the other corresponding rows in each group are also aligned.

[0043] In some embodiments, the optical detection device 100 can be made smaller to improve portability. Figure 1C Another exemplary structural diagram of the optical detection device 100 provided by an embodiment of the present disclosure is shown. AsFigure 1C As shown in Figure 1C , the optical detection device 100 includes a 4×4 photosensitive unit array. For such a device 100, it cannot cover any side of the display panel to be measured in terms of both length and width. Therefore, when detecting the display panel, an S-shaped reciprocating route is required to complete the detection of the entire display panel.

[0044] It can be understood that under the structural design of the device 100 in the embodiments of the present disclosure, the detection accuracy of the photosensitive unit 104 itself can be several micrometers. Therefore, general optical photosensitive devices can be used as the photosensitive unit 104 in the device 100. For example, the photosensitive unit 104 can be a photodiode (PIN) optical sensor, a charge-coupled device (CCD) image sensor, or a complementary metal-oxide-semiconductor (CMOS) image sensor.

[0045] Figure 2 The flowchart of the exemplary method 200 provided by the embodiments of the present disclosure is shown.

[0046] As Figure 2 shown in Figure 2 , the method 200 can use any embodiment or arrangement and combination of the foregoing optical detection device 100 to detect the display panel. The method 200 may include the following steps.

[0047] In step 202, the movement route of the display panel can be determined first according to the size relationship (or size ratio relationship) between the optical detection device 100 and the display panel to be measured.

[0048] Since there are various sizes of display panels, and the size of the optical detection device 100 is generally fixed, there may be a problem that the optical detection device 100 does not match the display panel.

[0049] For example, Figure 1A and Figure 1B as shown in Figure 1B , the length L4 of a row of photosensitive units 104 of the device 100 is greater than the length of the display panel. During detection, the display panel can move linearly only in one direction. For another example, Figure 1C as shown in Figure 1C , the length of a row of photosensitive units 104 of the device 100 may be both less than the length of the display panel and less than the width of the display panel. During detection, the display panel needs to move reciprocally along an S-shaped route.

[0050] Therefore, in some embodiments, step 202 may further include:

[0051] If the length of a row of photosensitive units 104 of the optical detection device 100 is greater than the side length of the first side of the display panel to be measured, the movement route is a linear movement route along the extension direction of the second side of the display panel, where the first side and the second side are perpendicular to each other.

[0052] Figure 3A FIG. 2 shows an exemplary schematic diagram of the optical detection of the display panel 300 by the device 100 according to an embodiment of the present disclosure. As Figure 3A shown, the length L4 of a row of photosensitive units 104 of the optical detection device 100 is greater than or equal to the long side 302 of the display panel 300. Therefore, the movement route of the display panel 300 can be a straight movement route 110 along the extension direction of the short side 304 of the display panel 300.

[0053] If the length of a row of photosensitive units 104 of the optical detection device 100 is less than the side length of any side of the display panel 300, the movement route is an S-shaped route, where the starting point of the S-shaped route is the position of the display panel when the first corner of the display panel is covered by the optical detection device 100, and the ending point of the S-shaped route is the position of the display panel when the second corner of the display panel is covered by the optical detection device 100.

[0054] Figure 4 FIG. 3 shows another exemplary schematic diagram of the optical detection of the display panel 300 by the device 100 according to an embodiment of the present disclosure. As Figure 4 shown, the length L4 of a row of photosensitive units 104 of the optical detection device 100 is less than the long side 302 of the display panel 300 and less than the short side 304 of the display panel 300. Therefore, the movement route of the display panel 300 can be an S-shaped route 112. As Figure 4 shown, the starting point of the S-shaped route can be the position of the display panel 300 when the first corner of the display panel 300 ( Figure 4 the lower left corner of the display panel 300 in FIG. 3) is covered by the optical detection device 100, and the ending point of the S-shaped route can be the position of the display panel 300 when the second corner of the display panel 300 ( Figure 4 the upper right corner of the display panel 300 in FIG. 3) is covered by the optical detection device 100.

[0055] It can be understood that the first corner and the second corner of the display panel 300 can be any two different corners of the display panel 300. For example, the connection line between the first corner and the second corner can be on the diagonal of the display panel 300, as Figure 4 shown. In some cases, based on different sizes, the connection line between the first corner and the second corner can also be a connection line parallel to the long side 302 or the short side 304 of the display panel 300.

[0056] In step 204, the optical detection device 100 can be controlled to collect the picture information of the display panel 300 at the first position.

[0057] For example, in Figure 3A FIG. 3, one of the long sides of the display panel 300 is the first position. For another example, in Figure 4Among them, the position at the outermost edge of one of the long sides of the display panel 300 is the first position. It can be understood that, according to different movement routes, the first position may be different. For example, in Figure 3A 's example, one of the short sides of the display panel 300 can also be selected as the first position where the device 100 acquires the picture. However, in such an embodiment, the moving distance of the display panel 300 will increase. Another example is in Figure 4 's example, the position at the outermost edge of one of the short sides of the display panel 300 can also be selected as the first position where the device 100 acquires the picture. Correspondingly, the S-shaped movement route is different from the route 112, but the moving distance may be basically the same.

[0058] In step 206, the display panel 300 can be controlled to move a first distance along the movement route and acquire the picture information of the display panel 300 again.

[0059] Figure 3B FIG. shows another exemplary schematic diagram of the device 100 performing optical detection on the display panel 300 according to an embodiment of the present disclosure. In Figure 3B 's example, the photosensitive units 104 filled with different patterns represent the relative positions of the photosensitive units 104 and the display panel 300 at different times. It can be seen that in Figure 3B 's example, the display panel 300 can move a distance L5 along the movement route 110, and the device 100 can acquire the picture information of the display panel 300 again. This distance L5 can also be smaller than the sub-pixel size of the display panel 300. For example, the distance L5 can be equal to the relative side distance L2 of the photosensitive unit 104, or equal to the offset distance L3 between adjacent rows of photosensitive units 104.

[0060] In step 208, the previous step 206 can be repeatedly executed until all the acquired picture information can jointly cover the entire picture of the display panel 300.

[0061] Figures 3C to 3F FIG. shows a plurality of exemplary schematic diagrams of the device 100 performing optical detection on the display panel 300 according to an embodiment of the present disclosure. In Figures 3C to 3F 's example, the photosensitive units 104 filled with different patterns represent the relative positions of the photosensitive units 104 and the display panel 300 at different times.

[0062] It can be seen that from Figures 3C to 3F , the display panel 300 moves a distance L5 along the movement route 110 each time, and the device 100 correspondingly acquires the picture information of the display panel 300 at this position. After multiple steps of movement and acquisition, the picture information acquired each time can jointly cover the entire picture of the display panel 300. From Figures 3C to 3FIt can also be seen that when the display panel 300 moves to the position where the photosensitive units 104 of the next row are located, as Figure 3A and Figure 3F shown, due to the existence of the offset distance L3, the blank area that is not detected at the spacing L2 between the adjacent photosensitive units 104 of the photosensitive units 104 in the previous row can be detected by the photosensitive units 104 in its next row, thereby making up for the blank of the detected data. In view of this, when the spacing L2 is equal to the offset distance L3, the detection blank can be completely made up for.

[0063] In some embodiments, when the photosensitive unit is a CCD or a CMOS, to ensure that the image collected by the device 100 is not stretched or compressed, the horizontal resolution (the resolution of the CCD or CMOS) and the vertical resolution (realized by the stepping motor that controls the movement of the display panel) need to be equal.

[0064] We can set the following variables:

[0065] 1) The number of pixels corresponding to each row of photosensitive units 104 (unit: pixel): Hc;

[0066] 2) The width of the display panel (unit: m): Lo;

[0067] 3) The moving speed of the display panel (unit: m / s): Vo;

[0068] 4) The line scanning rate of one row of photosensitive units 104 (unit: Hz, that is, lines / s): Vc;

[0069] 5) If scanning one frame of image, the running time of the display panel (unit: s): To;

[0070] 6) If scanning one frame of image, the scanning time of one row of photosensitive units 104 (unit: s): Tc.

[0071] In the embodiments of the present disclosure, the horizontal resolution is: (Lo / Hc) / m, where m is the multiple that increases the horizontal resolution in the embodiments of the present disclosure, such as the ratio of the side length of the photosensitive unit 104 to the distance L5 (for example, 4).

[0072] The vertical resolution is: (Vo×To) / (Vc×Tc), speed / line value;

[0073] It is easy to know that To = Tc.

[0074] According to the principle of "the horizontal and vertical resolutions are equal", the following formula is obtained:

[0075] (Lo / Hc) / m = Vo / Vc.

[0076] Then the line scanning rate of the photosensitive unit 104 is:

[0077] Vc = Hc × Vo × m / Lo.

[0078] In step 210, the display panel can be optically detected based on the acquired frame information.

[0079] Figure 5A FIG. shows a schematic distribution diagram of a partial acquisition area 400 and an area 500 therein of the photosensitive unit 104 during the detection according to an embodiment of the present disclosure. Figure 5A In the figure, the frames acquired by the photosensitive unit 104 at different times are represented by different filling patterns.

[0080] As Figure 5A shown, taking the display panel 300 moving along the moving route 110 relative to a photosensitive unit 104 as an example, after the display panel 300 moves multiple times, the acquisition area 400 is obtained by multiple acquisitions made by the photosensitive unit 104. As Figure 5A shown, the relative position relationship between the photosensitive unit and the display panel changes from state A to state G in sequence.

[0081] Assume that for the area 500 corresponding to the dashed box of the acquisition area 400, we only process the display frames acquired by this one photosensitive unit Figure 5A in the figure. Then, some areas a1, a2, a3, a4 in the area 500 are respectively acquired 4 times by the photosensitive unit. For example, when the relative position relationship between the photosensitive unit and the display panel is in state A, the area a1 is acquired once; when the relative position relationship between the photosensitive unit and the display panel is in state B, the areas a1 and a2 are acquired once; when the relative position relationship between the photosensitive unit and the display panel is in state C, the areas a1, a2 and a3 are acquired once; when the relative position relationship between the photosensitive unit and the display panel is in state D, the areas a1, a2, a3 and a4 are acquired once. It can be seen that at this time, the area a1 is acquired 4 times. Therefore, the optical data amount of the area a1 can be calculated based on the acquisition data of the photosensitive unit when the relative position relationship between the photosensitive unit and the display panel is in states A - D.

[0082] It can be understood that since the device 100 is an array of photosensitive units, due to the existence of the offset distance L3, the existence of the spacing L2, and the different selections of the initial first position, there may be some areas where only one photosensitive unit can acquire its data multiple times, while there may be many photosensitive units that can acquire its data multiple times in some areas.

[0083] Figure 5B FIG. shows another schematic distribution diagram of a partial acquisition area 400 and an area 500 therein of the photosensitive unit 104 during the detection according to an embodiment of the present disclosure. Figure 5BIn [the figure], the images captured by the photosensitive unit 104 at different times are represented by different filling patterns.

[0084] As Figure 5B shown, the area 500 corresponding to the dashed box can be further divided into 16 small areas. Each small area is captured 4 times by 4 photosensitive units respectively, that is, a total of 16 captures, which means there are 16 capture data (belonging to 4 photosensitive units) that can be used to calculate the optical data volume of this small area.

[0085] It can be seen that since the areas of the display panel may be captured by different photosensitive units, and the number of captures in different areas also varies. Therefore, in some embodiments, step 210 may further include:

[0086] Based on the captured image information, determine the corresponding relationship between each piece of the image information and the display panel; that is, it is necessary to establish a connection between the data captured by each photosensitive unit and the corresponding position of the display panel;

[0087] According to the corresponding relationship between each piece of the image information and the display panel, and combining each piece of the image information, calculate the optical data of the corresponding position of the display panel; that is, after determining the relationship between the data captured by each photosensitive unit and the corresponding position of the display panel, the optical data of this position of the display panel can be calculated based on the data captured by the corresponding photosensitive unit;

[0088] Then, based on the optical data of the corresponding position of the display panel, complete the optical detection of the display panel. For example, if the uniformity between the calculated optical data of each sub-region is lower than the set threshold, it is determined that there is a problem with the optical uniformity of the display panel.

[0089] In some embodiments, according to the corresponding relationship between each piece of the image information and the display panel, and combining each piece of the image information, calculating the optical data of the corresponding position of the display panel may further include:

[0090] According to the relationship between the first distance and the size of the photosensitive unit, determine the number of sub-regions of the area corresponding to the capture data of the photosensitive unit;

[0091] Based on the number of sub-regions, and combining each piece of the image information, calculate the optical data of the corresponding position of the display panel.

[0092] For Figure 5BFor example, the ratio of the side length L6 of the photosensitive unit to the first distance L5 is 4:1, and accordingly, the number of subdivided regions of the region 500 corresponding to the collected data of the photosensitive unit may be 16. Thus, for a subdivided region, the optical data of the photosensitive unit that collects the picture information of the display panel at its corresponding position may be divided by the number of subdivided regions (for example, 16) to obtain the optical data collected by the photosensitive unit in the subdivided region.

[0093] Assume that there are i photosensitive units that have collected j times for the subdivided area. For example, the optical data collected from the first to the i-th time by the first photosensitive unit is k11-ki1, the optical data collected from the first to the i-th time by the second photosensitive unit is k12-ki2, and so on, the optical data collected from the first to the i-th time by the j-th photosensitive unit is k1j-kij. In this way, the optical data of the display panel corresponding to the subdivided area can be the sum of the optical data of the i×j photosensitive units divided by i×j.

[0094] For example, taking the ratio of the side length L6 of the photosensitive unit to the first distance L5 as 4:1, assuming that a subdivided area is captured 4 times by 4 photosensitive units respectively, the optical data of the display panel corresponding to the subdivided area can be (k11+k21+k31+k41+k12+k22+k32+k42+k13+k23+k33+k43+k14+k24+k34+k44)÷16.

[0095] It can be seen that the data collected by each photosensitive unit in the embodiment of the present disclosure can be further subdivided so that the detection accuracy can reach sub-pixel resolution accuracy. In addition, by adjusting the proportional relationship between the side length of the photosensitive unit and the moving distance of the display panel, the detection accuracy can be further improved.

[0096] The optical detection device and display panel detection method provided by the embodiments of the present disclosure can achieve a resolution accuracy that is several times smaller than the detection pixel size, that is, sub-pixel resolution accuracy, compared with traditional camera detection.

[0097] The photosensitive units of the disclosed embodiments can be directly or spliced ​​into an optical detection device of any size, which can be used to improve the resolution of optical sensors, and can also be used to improve the detection resolution accuracy and image quality of camera photosensitive units. Furthermore, the optical detection device can also be made into an array device of the same size as the display panel, which can be used for micro-detection of large-area objects to be tested.

[0098] The photosensitive unit of the embodiment of the present disclosure includes but is not limited to PIN, CCD, CMOS and other photosensitive devices. The substrate of the optical detection device of the embodiment of the present disclosure includes but is not limited to glass substrate, silicon substrate, sapphire substrate and the like.

[0099] To achieve large-area detection, if the photosensitive unit is a PIN, a PIN array driven by glass substrate can be directly fabricated as an optical detection device. If the photosensitive unit is a silicon-based device such as a CCD or CMOS, an optical detection device with the same size as the display panel can be formed by the method of transferring and splicing on a glass substrate.

[0100] Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the concept of the present disclosure, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.

[0101] In addition, for the sake of simplicity of description and discussion, and in order not to make the embodiments of the present disclosure difficult to understand, the well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. In addition, the devices may be shown in block diagram form in order to avoid making the embodiments of the present disclosure difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which the embodiments of the present disclosure are to be implemented (i.e., these details should be fully within the understanding of those skilled in the art). In the case where specific details (such as circuits) are set forth to describe the exemplary embodiments of the present disclosure, it will be apparent to those skilled in the art that the embodiments of the present disclosure can be implemented without these specific details or with variations of these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0102] Although the present disclosure has been described in connection with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. For example, other memory architectures (such as dynamic RAM (DRAM)) can be used with the embodiments discussed.

[0103] The embodiments of the present disclosure are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. An optical detection device for detecting a display panel, comprising photosensitive units arranged in an array; the distance between opposite sides of adjacent photosensitive units is less than the sub-pixel size of the display panel, and adjacent rows of photosensitive units have a position offset in a first direction, and the offset distance corresponding to the position offset is less than the sub-pixel size of the display panel; Wherein, Taking n rows of the photosensitive units as a group, the photosensitive units in each group are arranged side by side in the second direction, where n is an integer greater than or equal to 2, and the second direction is perpendicular to the first direction; wherein, in a group of the photosensitive units, the photosensitive units in adjacent rows have the position offset in the first direction, and the photosensitive units in adjacent groups do not have relative position offset as a whole.

2. The device according to claim 1, wherein, The distance between adjacent photosensitive units is an integer multiple of the distance between the relative sides of the adjacent photosensitive units, and the distance between adjacent photosensitive units is an integer multiple of the offset distance.

3. The device according to claim 1 or 2, wherein, The length and width of the photosensitive unit are equal, and the distance between the relative sides of the adjacent photosensitive units is equal to the offset distance.

4. The device according to claim 3, wherein, The size of each photosensitive unit is the same, and the length and width of each photosensitive unit are both equal.

5. The device according to claim 1, wherein, The initial positions of the corresponding rows in each group of photosensitive units are the same.

6. The device according to claim 2, wherein, Adjacent photosensitive units refer to the photosensitive units adjacent in the first direction and the photosensitive units adjacent in the second direction.

7. The device according to claim 5 or 6, wherein, The first direction is the row direction of the photosensitive units arranged in an array, and the second direction is the column direction of the photosensitive units arranged in an array.

8. The device according to claim 1, wherein, The length of one row of the photosensitive units is greater than the side length of at least one side of the display panel.

9. The device according to claim 5 or 6, wherein, The photosensitive unit is a photodiode optical sensor, a charge-coupled device image sensor or a complementary metal oxide semiconductor image sensor.

10. A method for detecting a display panel using the optical detection device according to any one of claims 1-9, comprising: Determine the moving route of the display panel according to the size relationship between the optical detection device and the display panel; Control the optical detection device to collect the picture information of the display panel at the first position; Control the display panel to move a first distance along the moving route and control the optical detection device to collect the picture information of the display panel again; Repeat the previous step until the collected picture information can jointly cover the complete picture of the display panel; and Optically detect the display panel based on the collected picture information.

11. The method according to claim 10, wherein, Determine the moving route of the display panel according to the size relationship between the optical detection device and the display panel, including: If the length of one row of the photosensitive units of the optical detection device is greater than or equal to the side length of the first side of the display panel, the moving route is a straight-line movement route along the extension direction of the second side of the display panel, where the first side and the second side are perpendicular to each other; and If the length of one row of the photosensitive units of the optical detection device is less than the side length of any side of the display panel, the moving route is an S-shaped route, where the starting point of the S-shaped route is the position of the display panel when the first corner of the display panel is covered by the optical detection device, and the end point of the S-shaped route is the position of the display panel when the second corner of the display panel is covered by the optical detection device.

12. The method according to claim 11, wherein, Optically detect the display panel based on the collected picture information, including: Based on the collected picture information, determine the corresponding relationship between each picture information and the display panel; According to the correspondence between each of the screen information and the display panel, and combining each of the screen information, calculate the optical data of the corresponding position of the display panel; and Based on the optical data of the corresponding position of the display panel, complete the optical detection of the display panel.

13. The method according to claim 12, wherein, According to the correspondence between each of the screen information and the display panel, and combining each of the screen information, calculate the optical data of the corresponding position of the display panel, including: Determine the number of sub-regions corresponding to the photosensitive unit according to the relationship between the first distance and the size of the photosensitive unit; Based on the number of sub-regions, and combining each of the screen information, calculate the optical data of the corresponding position of the display panel.

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