Display panel and manufacturing method thereof, deviation calibration method, and display device

Abstract

The present application provides a display panel and a preparation method thereof, a deviation calibration method, and a display device. The display panel includes a display area, a non-display area located around the display area, and a virtual pixel area arranged between the display area and the non-display area; the display panel includes a ruler arranged at the periphery of the virtual pixel area, the ruler includes ruler lines, and in a direction parallel to the edge of the display panel, the distance between adjacent ruler lines is greater than the width of the ruler lines. The deviation calibration method includes using an inkjet printing device to print ink droplets on the ruler of the display panel; calculating the inkjet printing deviation according to the position of the ink droplets on the ruler; and calibrating the inkjet printing device based on the inkjet printing deviation. The preparation method includes forming a ruler at the periphery of the virtual pixel area through a composition process. The display device includes the display panel.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a preparation method thereof, a deviation calibration method, and a display device. Background Art

[0002] Compared with traditional liquid crystal display devices, organic light emission diode (OLED) display devices are not only lighter and thinner, but also have the advantages of self-luminescence, low power consumption, no need for backlight, no viewing angle limitation and fast response speed, and have broad application prospects.

[0003] Inkjet printing (IJP) technology is used in the production process of OLEDs, and has the advantages of being simple to operate and suitable for large-scale production. However, during the inkjet printing process, the deviation of the nozzle spitting angle and the deviation of the spacing position of different batches of substrates will cause color mixing, affecting product quality. Summary of the invention

[0004] In view of this, the purpose of the present application is to propose a display panel and a preparation method thereof, a deviation calibration method, and a display device to solve the printing color cross-talk problem caused by the position deviation of backplanes from different batches.

[0005] In a first aspect of the present application, a display panel is provided, comprising:

[0006] The display panel comprises a display area, a non-display area located around the display area, and a virtual pixel area arranged between the display area and the non-display area; the display panel comprises a ruler arranged around the virtual pixel area, the ruler comprises ruler lines, and in a direction parallel to the edge of the display panel, the distance between adjacent ruler lines is greater than the width of the ruler lines.

[0007] In a second aspect of the present application, a method for calibrating inkjet printing deviation applied to the above-mentioned display panel is provided, comprising:

[0008] Printing ink drops on the scale of the display panel using an inkjet printing device;

[0009] calculating inkjet printing deviation according to the position of the ink drop on the ruler;

[0010] The inkjet printing device is calibrated based on the inkjet printing deviation.

[0011] In a third aspect of the present application, a method for manufacturing a display panel is provided, wherein the display panel comprises a display area, a non-display area located around the display area, and a virtual pixel area arranged between the display area and the non-display area, and the manufacturing method comprises:

[0012] A ruler is formed at the periphery of the virtual pixel area by a patterning process; wherein the ruler comprises ruler lines, and in a direction parallel to an edge of a display panel, a distance between adjacent ruler lines is greater than a width of the ruler lines.

[0013] In a fourth aspect of the present application, a display device is provided, comprising the display panel as described in the first aspect.

[0014] From the above description, it can be seen that the present application provides a display panel and its preparation method, a deviation calibration method, and a display device. By designing a scale pattern on the periphery of the virtual pixel area of ​​the display panel and using a printing calibration method to determine the approximate deviation direction of the entire back panel, reasonable machine deviation corrections can be made in a timely manner, thereby avoiding the printing color cross-talk problem caused by the position deviation of back panels of different batches to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of a display panel provided by the present application is shown.

[0017] Figure 2 A schematic diagram of another display panel provided in the present application is shown.

[0018] Figure 3 A schematic diagram of a first scale and a second scale of a display panel provided by the present application is shown.

[0019] Figure 4 A cross-sectional view of a display panel provided by the present application is shown.

[0020] Figure 5 A flow chart of the inkjet printing deviation calibration method for a display panel provided in the present application is shown.

[0021] Figure 6 A schematic diagram of another display panel provided in the present application is shown.

[0022] Figure 7 A schematic diagram of a display device provided in the present application is shown. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0024] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] In the process of inkjet printing OLED devices, the nozzle angle deviation and the backplane position deviation often cause color mixing, affecting product quality. Especially on the linear pixel definition structure (Line Bank) products, local color mixing will cause large-area display abnormalities. Currently, most of the local area color mixing in printing is caused by the position accuracy deviation when the backplane is made. Therefore, simply correcting the machine and nozzle position cannot solve the color mixing problem.

[0026] At present, inkjet printing equipment corrects the impact position by regularly correcting the nozzle and machine position. The correction process is only carried out using a standard film or equipment benchmark alignment calibration solution. However, when there is a difference in the back plate position, especially for high-definition Line Bank products, since the ink between the sub-pixel areas of the same color is interconnected, it is easy to cause large-area printing color cross-linking problems caused by print impact position deviation during the printing process.

[0027] To address the above problems, the embodiments of the present application design a specific scale pattern on the periphery of the virtual pixel area (Dummy) of the display panel, and use a specific printing method to quickly determine the approximate deviation direction of the entire backplane, and make reasonable machine deviation corrections in time to solve the printing color cross-over problem caused by the position deviation of the backplanes of different batches.

[0028] Figure 1 A schematic diagram of a display panel provided by the present application is shown.

[0029] like Figure 1As shown, the display panel may be an OLED display panel, and may include a display area 10, a non-display area 50 located around the display area (AA) 10, and a virtual pixel area 20 located between the display area 10 and the non-display area 50. The display panel may further include a ruler 30 for calculating the deviation, which is disposed at the periphery of the virtual pixel area 20 and located in the non-display area 50. The ruler 30 may include a first ruler 301 extending along a first direction X and a second ruler 302 extending along a second direction Y. The first direction X and the second direction Y intersect. In some embodiments, as shown in FIG. Figure 1 As shown, the first direction X and the second direction Y may also be perpendicular. The display panel may further include a pixel definition layer (PDL) 40, and the pixel definition layer 40 may include a first pixel definition layer 401 extending along the first direction X and a second pixel definition layer 402 extending along the second direction Y. The display panel may further include a plurality of sub-pixels 101 divided by the pixel definition layer 40, and the plurality of sub-pixels may include a display sub-pixel 1012 located in the display area 10 and a virtual sub-pixel 1011 located in the virtual pixel area 20.

[0030] In some embodiments, Figure 1 As shown, the distance L3 between the first ruler 301 and the edge of the pixel defining layer 40 to which it is close can be an integer multiple of the pitch L2 between the sub-pixels 101. The distance L4 between the second ruler 302 and the edge of the pixel defining layer 40 to which it is close can be consistent with the width L2' of the second pixel defining layer 402, or slightly larger than the width L2' of the second pixel defining layer 402. The above-mentioned distances are designed mainly to facilitate the setting of the inkjet printing device during the printing test.

[0031] In some embodiments, the length of the first ruler 301 along the first direction X may be equal to the length of the first pixel defining layer 401 along the first direction X, and the length of the second ruler 302 along the second direction Y may be equal to the length of the second pixel defining layer 402 along the second direction Y, so as to ensure that during the test calibration, the ink droplets dropped at any position in the display area 10 and the virtual pixel area 20 can be read by the ruler 30. It can be understood that the length of the first ruler 301 along the first direction X and the length of the first pixel defining layer 401 along the first direction X are not necessarily completely equal, for example, there may be a certain error range (for example, about 0.5-5% of the length of the first pixel defining layer 401 along the first direction X). Similarly, the length of the second ruler 302 along the second direction Y and the length of the second pixel defining layer 402 along the second direction Y are not necessarily completely equal, for example, there may be an error range of 0.5-5%. For example, the length of the first ruler 301 along the first direction X can be slightly larger than the length of the first pixel defining layer 401 along the first direction X, and the length of the second ruler 302 along the second direction Y can be slightly larger than the length of the second pixel defining layer 402 along the second direction Y. The purpose of this setting is to prevent ink droplets with large deviations from falling outside the range of the ruler 30 and making it impossible to read the position.

[0032] In some embodiments, the width L5 of the first scale 301 may be greater than or equal to twice the length of the sub-pixel 101 along the second direction Y, and the width L6 of the second scale 302 may be greater than or equal to twice the length of the sub-pixel 101 along the first direction X. Since it is necessary to spray the test ink droplets on the scale 30 during deviation calibration, the above-mentioned size is designed mainly considering that in the case of some extreme ink drop deviations, the deviation may exceed the size of a sub-pixel, so the width of the scale is increased to increase the range covered by the scale.

[0033] It should be noted that the design of the scale size needs to be adjusted according to the requirements of different products. For example, when the display panel is used in a narrow-frame display product, the width of the scale does not need to occupy too much range.

[0034] Figure 2 A schematic diagram of another display panel provided in the present application is shown.

[0035] In some embodiments, when making the ruler, the ruler and the gate layer (Gate) are set on the same layer and the ruler and the gate layer wiring can be made through the exposure, development and etching process to save process and reduce production costs. Therefore, considering the path of the gate layer wiring, a gap can be set in the middle of the ruler to allow the gate layer wiring to pass through, such as Figure 2As shown, the scale positions corresponding to the first pixel defining layer 401 and the second pixel defining layer 402 are separated, so that the first scale 301 forms a plurality of first sub-scales 304 arranged along the first direction X, and the second scale 302 forms a plurality of second sub-scales 305 arranged along the second direction Y. The measuring lengths of the first sub-scale 304 and the second sub-scale 305 are equal to the sub-pixel 101. It can be understood that the measuring lengths of the first sub-scale 304 and the second sub-scale 305 can also match the sub-pixel 101, for example, the measuring lengths of the first sub-scale 304 and the second sub-scale 305 are slightly larger than the sub-pixel 101 to prevent the ink droplets that fall outside the scale reading range from being unable to read the position. When performing test calibration, the ink droplet 303 should be dropped within the measuring range of the first sub-scale 304 and the second sub-scale 305 to read the drop position of the ink droplet 303.

[0036] Figure 3 A schematic diagram of a first scale 304 and a second scale 305 of a display panel provided by the present application is shown.

[0037] The first sub-scale 304 and the second sub-scale 305 may include a scale line 3041 and a space 3042 between adjacent scale lines. The zero scale of the scale line 3041 is located at the center of the first sub-scale 304 and the second sub-scale 305. The width of the scale line 3041 and the space 3042 between adjacent scale lines determine the density of the scale. In the first direction X parallel to the edge of the display panel, the distance between adjacent scale lines (i.e., the space 3042 between scale lines) may be greater than the width of the scale line 3041. Similarly, in the second direction Y parallel to the edge of the display panel, the distance between adjacent scale lines (i.e., the space 3042 between scale lines) may be greater than the width of the scale line 3041. During design, the density of the scale needs to be designed according to the accuracy of the exposure equipment and the specifications of the inkjet printing equipment.

[0038] In some embodiments, according to the accuracy of the G8.5 exposure device, the width of the scale line 3041 can be designed to be greater than or equal to 2.5 microns, and the spacing 3042 between adjacent scale lines can be greater than or equal to 3 microns and not more than 16 microns. The scale at this density can match the finest 2 picoliter printing ink droplets currently, that is, it can match ink droplets with a diameter of about 16 microns after the ink droplets fall on the scale and spread.

[0039] In some embodiments, if the accuracy of the exposure device is not enough, the density of the ruler can be changed according to different ink droplet sizes, but the spacing 3042 between adjacent ruler lines must be smaller than the diameter of the ink droplets after spreading, preferably smaller than the radius of the ink droplets after spreading, so as to read more accurate scale values. At the same time, the density of the ruler must be greater than the minimum resolution of the exposure device to prevent the images of the exposed ruler from overlapping and making it impossible to directly read the scale. Considering the compatibility of different printing ink droplet sizes, the ruler can be directly made according to the densest standard.

[0040] Figure 4 A cross-sectional view of a display panel provided by the present application is shown.

[0041] like Figure 4 As shown, the display panel may include a substrate 100, a scale 30, and a passivation layer (Passivation Layer) 102 and a pixel defining layer 40 arranged in a stacked manner. The passivation layer 102 covers the scale 30 to protect the scale 30. When making the passivation layer 102, a chemical vapor deposition process (PECVD) can be used. The passivation layer 102 and the pixel defining layer 40 are both transparent film layers, so that when the ink drop 303 drops on the position of the scale 30, it will naturally shrink into an approximate circle, and the center position of the circle is the actual impact position of the print. At the same time, since the passivation layer 102 and the pixel defining layer 40 are both transparent films, when reading the scale value of the scale 30, the accurate reading of the center of the ink drop 303 on the scale can be seen by the camera (CCD) of the inkjet printing device.

[0042] It should be noted that the scale 30 and the gate layer are made in the same layer and are located on the substrate 100. The substrate 100 may also include other stacked multiple-level structures, such as an insulating layer, an anode layer, a light-emitting layer, and the like.

[0043] The present application embodiment provides an inkjet printing deviation calibration method applied to the above-mentioned display panel, such as Figure 5 As shown in the flowchart, the method includes:

[0044] S501: Print ink droplets 303 on the scale 30 of the display panel using an inkjet printing device. It can be understood that Figure 6 Each circular pattern in can be an ink drop.

[0045] As an optional embodiment, when performing a printing test, the ink droplet impact position of the inkjet printing device can be set to the zero scale position of the first sub-scale 304 and the second sub-scale 305, and the ink droplets can be printed according to the set ink droplet impact position. In this way, the printing deviation can be calculated by reading the deviation value of the ink droplet relative to the zero scale position.

[0046] S502: Calculate inkjet printing deviation according to the position of the ink drop on the ruler.

[0047] like Figure 6 As shown in FIG. 1 , as an optional embodiment, the display panel may further include a first area 60, a second area 70, a third area 80 and a fourth area 90 located at four corners and including at least a portion of the scale 30. In some embodiments, as shown in FIG. Figure 6 As shown, the first region 60 , the second region 70 , the third region 80 and the fourth region 90 may further include at least a portion of the virtual pixel area 20 .

[0048] In some embodiments, the ink droplet impact position may include a plurality of first positions respectively located in the first area 60, the second area 70, the third area 80 and the fourth area 90. Figure 6 As shown, the multiple first positions may include a position 601 located in the first area 60, a position 701 located in the second area 70, a position 801 located in the third area 80, and a position 901 located in the fourth area 90. In this way, the first deviation value in the first direction X and the second deviation value in the second direction Y of the first area 60, the second area 70, the third area 80, and the fourth area 90 of the display panel can be calculated respectively according to the actual impact position of the ink drop on the ruler 30 and the preset first position.

[0049] In some embodiments, the first deviation value and the second deviation value may be the average deviations of the first area 60, the second area 70, the third area 80 and the fourth area 90 in the first direction X and the second direction Y, respectively, thereby avoiding data deviation caused by a single data itself.

[0050] In some embodiments, the ink droplet impact position may further include a plurality of second positions respectively located in the virtual pixel area 20 included in the first area 60, the second area 70, the third area 80 and the fourth area 90. Figure 6 As shown, the plurality of second positions may include a position 602 located in the first area 60, a position 702 located in the second area 70, a position 802 located in the third area 80, and a position 902 located in the fourth area 90. When performing the test calibration, firstly determine the deviation of the actual impact position of the first target ink droplet on the ruler 30 relative to the preset first position of the first target ink droplet. Figure 6 As shown, the first target ink droplets may include ink droplets 6011, 7011, 8011 and 9011 located at first positions 601, 701, 801 and 901 respectively, and the deviation may be read based on the positions of the ink droplets 6011, 7011, 8011 and 9011 on the sub-scale. After the deviation is obtained, calibration may be performed based on the deviation.

[0051] Since the inkjet printing device may cause large printing deviation due to some accidental reasons, this deviation is not caused by the deviation of the display panel itself. Therefore, in order to determine whether the measured deviation can accurately reflect the deviation of the display panel, in some embodiments, it can be further determined whether the obtained deviation is greater than the deviation threshold to determine whether the deviation can be used for calibration.

[0052] In some embodiments, the ink droplet impact position may also be set to be a plurality of second positions located in the virtual pixel area 20 respectively included in the first area 60, the second area 70, the third area 80 and the fourth area 90. Figure 6 As shown, the virtual sub-pixels may include virtual sub-pixels 602, 702, 802 and 902. When the ink droplet impact position is set to be located in the virtual sub-pixels respectively included in the first area 60, the second area 70, the third area 80 and the fourth area 90, the ink droplet impact position can be considered to be set to the second position.

[0053] In this way, when the deviation obtained based on the actual impact position of any ink droplet (for example, ink droplet 6011, 7011, 8011 or 9011) on the sub-scale is greater than a deviation threshold (which can be set based on experience, for example, 15 microns), it can be further determined whether the position of the second target ink droplet corresponding to the first target ink droplet in the virtual pixel area 20 is located in the corresponding virtual sub-pixel. Here, the first target ink droplet may refer to an ink droplet whose deviation of any one of ink droplets 6011, 7011, 8011 and 9011 is greater than the deviation threshold, and the second target ink droplet may be an ink droplet corresponding to the position of the first target ink droplet. In some embodiments, the second target ink droplet may be an ink droplet that is located in the same area as the first target ink droplet (for example, both are located in the first area 60) and is located in the virtual pixel area and adjacent to the first target ink droplet. Figure 6 For example, assuming that the first target ink droplet is the first ink droplet from top to bottom on the left scale, the second target ink droplet can be the ink droplet in the same row and adjacent to it in the virtual sub-pixel. Similarly, assuming that the first target ink droplet is the first ink droplet from left to right on the upper scale, the second target ink droplet can be the ink droplet in the same column and adjacent to it in the virtual sub-pixel. The corresponding relationships of other target ink droplets can be inferred in the same way, which will not be repeated here.

[0054] In some embodiments, if the position of the second target ink droplet corresponding to the first target ink droplet in the virtual pixel area 20 is in the corresponding virtual sub-pixel, it means that the second target ink droplet can be printed normally at the corresponding position, and the large deviation of the first target ink droplet is caused by the problem of the inkjet printing device itself. In this case, the data of the position of the first target ink droplet on the scale 30 can be discarded, thereby avoiding the deviation caused by the problem of the inkjet printing device itself affecting the deviation calculation of the display panel.

[0055] In some embodiments, if the obtained deviation is less than the deviation threshold, the data of the position of the first target ink drop on the scale 30 is retained for calculating the deviation value.

[0056] S503: Calibrate the inkjet printing device based on the inkjet printing deviation.

[0057] Based on the first deviation values ​​of the first area 60, the second area 70, the third area 80 and the fourth area 90 in the first direction X and the second deviation values ​​in the second direction Y obtained in step S502, the average deviation values ​​of the back plate as a whole in the first direction X and the second direction Y are calculated. The inkjet printing device is calibrated in the first direction X and the second direction Y according to the calculated average deviation values.

[0058] The following is an explanation through specific embodiments.

[0059] Take the Line Bank design with 255 pixel density (PPI) as an example. Figure 3As shown, the width of the sub-pixel 101 divided by the pixel definition layer of this pixel density is generally about 20 microns. Currently, the volume of a single printing ink droplet 303 suitable for 255 PPI high-definition inkjet printing equipment is generally controlled at 2 picoliters or less. The diameter of the approximate circle formed by a 2-picoliter ink droplet 303 dropping on the first sub-scale 304 and the second sub-scale 305 (i.e., the aforementioned first position) is about 16 microns (i.e., the aforementioned first target ink droplet). The position of the dotted circle 3031 (i.e., the aforementioned second target ink droplet) is the theoretical printing impact position of the aforementioned first target ink droplet. The center position of the dotted circle 3031 is the exact center of the sub-pixel 101, which is the intersection of the zero scale lines of the first sub-scale 304 and the second sub-scale 305. At this time, the center position of the ink droplet 303 dropping on the first sub-scale 304 and the second sub-scale 305 is the deviation position of the actual ink droplet. After reading the center positions of multiple ink droplets, the average deviations of the ink droplets in the first direction X and the second direction Y are calculated respectively, which are the first deviation value in the first direction X and the second deviation value in the second direction Y of this area. If the deviation position of the actual ink droplet read is greater than the deviation threshold, it is tested whether the ink droplet can drop in the sub-pixel 101 (i.e., the aforementioned second position). If the ink drop can drip into the sub-pixel 101, the deviation value of the actual ink drop read at this time is discarded, and the second position is used as the actual ink drop dripping position. If the deviation position of the actual ink drop read is less than the deviation threshold, the deviation value of the actual ink drop read at this time is retained. The overall average deviation value of the backplane is calculated based on the first deviation value and the second deviation value and used to correct the printing start position of the inkjet printing equipment, so that the actual impact position of the ink drop can be adjusted to the vicinity of the zero scale line of the ruler, thereby minimizing the color mixing caused by the position deviation during the production of the backplane.

[0060] An embodiment of the present application also provides a method for manufacturing a display panel, wherein the display panel includes a display area, a non-display area located around the display area, and a virtual pixel area arranged between the display area and the non-display area. The method for manufacturing the display panel includes: forming a ruler around the virtual pixel area through a composition process; wherein the ruler includes ruler lines, and in a direction parallel to an edge of the display panel, a distance between adjacent ruler lines is greater than a width of the ruler lines.

[0061] In some embodiments, the display panel further includes a substrate and a gate layer disposed on the substrate, and the preparation method further includes: simultaneously forming the scale and the gate layer through a single patterning process, thereby saving manufacturing processes and improving manufacturing efficiency.

[0062] The method of the above embodiment is used to prepare the corresponding display panel in any of the above embodiments, and has the beneficial effects of the corresponding display panel embodiment, which will not be described in detail here.

[0063] The embodiment of the present application also provides a display device. Figure 7 A schematic diagram of a display device provided in the present application is shown.

[0064] like Figure 7 As shown, a display device 1000 provided in an embodiment of the present application may include any embodiment or arrangement or combination of the above-mentioned display panel. The display device is a product with an image display function, such as a display, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a personal digital assistant (PDA), a digital camera, a portable camcorder, a viewfinder, a navigator, a vehicle, a large-area wall, a home appliance, an information query device (such as business query equipment and monitors of departments such as e-government, banks, hospitals, and electricity, etc.).

[0065] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0066] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application 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 to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0067] Although the present application has been described in conjunction with specific embodiments of the present application, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0068] The embodiments of the present application are intended to cover all such substitutions, 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 application should be included in the scope of protection of the present application.

Claims

1. A display panel, comprising a display area, a non-display area located around the display area, and a virtual pixel area arranged between the display area and the non-display area; the display panel comprises a ruler arranged around the virtual pixel area, the ruler comprising ruler lines, and in a direction parallel to an edge of the display panel, a distance between adjacent ruler lines is greater than a width of the ruler lines; in, The display panel also includes a pixel defining layer arranged in the display area and the virtual pixel area, the pixel defining layer includes a first pixel defining layer extending along a first direction and a second pixel defining layer extending along a second direction, and the first direction intersects with the second direction; the ruler includes a first ruler and a second ruler; the length of the first ruler along the first direction is equal to the length of the first pixel defining layer along the first direction; the length of the second ruler along the second direction is equal to the length of the second pixel defining layer along the second direction.

2. The display panel according to claim 1, wherein: The display panel further includes a substrate and a gate layer arranged on the substrate, and the scale is arranged in the same layer as the gate layer.

3. The display panel according to claim 1, wherein: The display panel also includes a plurality of sub-pixels divided by the pixel defining layer, the first ruler includes a plurality of first sub-rulers arranged along the first direction, the second ruler includes a plurality of second sub-rulers arranged along the second direction, and the measured lengths of the first sub-rulers and the second sub-rulers are equal to the sub-pixels.

4. The display panel according to claim 3, wherein: The first sub-scale and the second sub-scale include scale lines, the width of the scale lines is greater than or equal to 2.5 micrometers, and the interval between adjacent scale lines is greater than or equal to 3 micrometers and does not exceed 16 micrometers.

5. The display panel according to claim 4, wherein: The zero scale of the scale line is located at the center of the first sub-scale and the second sub-scale.

6. The display panel according to claim 3, wherein: The width of the first ruler is greater than or equal to twice the length of the sub-pixel along the second direction; the width of the second ruler is greater than or equal to twice the length of the sub-pixel along the first direction.

7. The display panel according to claim 1, wherein: The display panel further includes a passivation layer; the passivation layer is a transparent film layer and covers the scale.

8. The display panel according to claim 3, wherein: The distance between the first ruler and the edge of the pixel definition layer adjacent to it is an integer multiple of the interval between the sub-pixels.

9. The display panel according to claim 1, wherein: The distance between the second ruler and the edge of the pixel defining layer close to it is equal to the width of the second pixel defining layer.

10. An inkjet printing deviation calibration method applied to a display panel as claimed in claim 1, comprising: Printing ink drops on the scale of the display panel using an inkjet printing device; calculating inkjet printing deviation according to the position of the ink drop on the ruler; The inkjet printing device is calibrated based on the inkjet printing deviation.

11. The method of claim 10, wherein: The display panel includes a first area, a second area, a third area and a fourth area located at four corners and including at least a portion of the scale, wherein the first area, the second area, the third area and the fourth area also include at least a portion of the virtual pixel area; the ink droplet impact position includes a plurality of first positions located in the first area, the second area, the third area and the fourth area, respectively, wherein the ink droplet impact position also includes a plurality of second positions located in the virtual pixel areas included in the first area, the second area, the third area and the fourth area, respectively; The step of calculating the inkjet printing deviation according to the position of the ink drop on the ruler comprises: Calculate first deviation values ​​in the first direction and second deviation values ​​in the second direction of the first area, the second area, the third area, and the fourth area of ​​the display panel respectively according to the position of the ink drop on the ruler and the first position; Determine whether the obtained deviation value can be used for calibration; determining a deviation of a position of a first target ink droplet on the scale relative to a first position of the first target ink droplet; In response to determining that the deviation is greater than the deviation threshold, determining whether a position of a second target ink droplet corresponding to the first target ink droplet in the virtual pixel area is located in a corresponding virtual sub-pixel; the ink droplet impact position of the second target ink droplet is the second position; In response to determining that the position of a second target ink droplet corresponding to the first target ink droplet in the virtual pixel area is located in a corresponding virtual sub-pixel, discarding data of the position of the first target ink droplet on the ruler; The calibrating the inkjet printing device based on the inkjet printing deviation includes: calibrating the inkjet printing device in the first direction and the second direction based on the first deviation value and the second deviation value.

12. A method for preparing a display panel, wherein: The display panel includes a display area, a non-display area located around the display area, and a virtual pixel area arranged between the display area and the non-display area. The preparation method includes: A ruler is formed at the periphery of the virtual pixel area by a patterning process; wherein the ruler comprises ruler lines, and in a direction parallel to the edge of the display panel, the distance between adjacent ruler lines is greater than the width of the ruler lines; A pixel defining layer is formed in the display area and the virtual pixel area through a composition process, and the pixel defining layer includes a first pixel defining layer extending along a first direction and a second pixel defining layer extending along a second direction, and the first direction intersects with the second direction; the ruler includes a first ruler and a second ruler; the length of the first ruler along the first direction is equal to the length of the first pixel defining layer along the first direction; the length of the second ruler along the second direction is equal to the length of the second pixel defining layer along the second direction.

13. The preparation method according to claim 12, wherein: The display panel further includes a substrate and a gate layer disposed on the substrate, and the forming of a ruler around the virtual pixel area by a patterning process includes: The scale and the gate layer are formed simultaneously through a single patterning process.

14. A display device comprising the display panel according to any one of claims 1 to 9.

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