CN111883575B - Display screen, display screen detection system and display screen detection method - Google Patents
Display screen, display screen detection system and display screen detection method Download PDFInfo
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- CN111883575B CN111883575B CN202010915096.XA CN202010915096A CN111883575B CN 111883575 B CN111883575 B CN 111883575B CN 202010915096 A CN202010915096 A CN 202010915096A CN 111883575 B CN111883575 B CN 111883575B
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
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Abstract
The embodiment of the application provides a display screen, a display screen detection system and a display screen detection method, and relates to the technical field of display screens. Two independent pads which are respectively and electrically connected with the anode and the cathode of the testing assembly area are added in the panel pad area of the display screen. When the position precision of the pixel evaporation area of the display screen is detected, the image of the testing component area under the irradiation of white light is obtained, and the image of the testing component area is lightened by the electric signal input by the newly added independent pad, so that an ultraviolet light source is not required to be additionally configured, and the production cost is reduced. Meanwhile, the panel pad area further comprises an independent pad used for lightening the effective light emitting area, when the metal pins are in contact with the corresponding independent pads, the test component area and the effective light emitting area can be lightened simultaneously, detection sites can be reduced, and the production efficiency of the display screen is improved. Reducing one inspection station also saves the equipment required for the station to provide inert gas, further reducing the manufacturing cost of the display screen.
Description
Technical Field
The application relates to the technical field of display, in particular to a display screen, a display screen detection system and a display screen detection method.
Background
In the manufacturing process of a display screen (for example, an OLED (organic light-Emitting Diode) display screen), the problems of color spots and uneven edge display brightness (mura) of the display screen are main bad manifestations of the display screen, and the key to improve the manufacturing yield of the display screen is to accurately and quickly detect the problems of the color spots and the uneven edge display brightness. The problems of color spots, uneven edge display brightness and the like are related to the Pixel Position Accuracy (PPA) in the display screen, and the problems of color spots, uneven edge display brightness and the like are difficult to occur when the Position deviation of the Pixel evaporation area is smaller (the Position Accuracy is higher). Therefore, how to detect the position accuracy of the pixel evaporation region in the display screen is a technical problem that needs to be solved urgently by those skilled in the art.
It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
Disclosure of Invention
In order to overcome the technical problems mentioned in the above technical background, embodiments of the present application provide a display screen, a display screen detection system, and a display screen detection method that can achieve position accuracy detection of a pixel evaporation region.
In a first aspect of the present application, a display screen (100) is provided, where the display screen (100) includes a panel pad region (120), and a test component region (110) for detecting a position accuracy of a pixel evaporation region;
the test component region (110) comprises an anode (111), a light-emitting layer (112) and a cathode (113), the light-emitting layer (112) is located between the anode (111) and the cathode (113), the light-emitting layer (112) comprises a first pixel evaporation region (1121), one side of the anode (111) facing the cathode (113) is provided with a test component pattern (1111), and the test component pattern (1111) comprises a standard test component (1111a) for calibrating the position of the first pixel evaporation region (1121);
the panel pad region (120) includes two independent pads electrically connected to the anode (111) and the cathode (113), respectively.
In one possible embodiment of the present application, the test element region 110 further comprises a compensation layer (114), the compensation layer (114) is located between the anode (111) and the cathode (113), the compensation layer (114) comprises a second pixel evaporation region (1141), the light emitting layer (112) and the compensation layer (114) do not overlap, and the standard test element (1111a) in the test element pattern (1111) is further used for calibrating the position of the second pixel evaporation region (1141).
In one possible embodiment of the present application, the anode (111) and the cathode (113) completely cover the light emitting layer (112) and the compensation layer (114) from both sides of the light emitting layer (112) and the compensation layer (114), respectively.
In one possible embodiment of the present disclosure, the first pixel evaporation region (1121) and the second pixel evaporation region (1141) are distributed in a rectangular shape, and the standard test component (1111a) is distributed between any two adjacent pixel evaporation regions.
In one possible embodiment of the application, the test element pattern (1111) further comprises a calibration mark (1111b), the calibration mark (1111b) being located in the center of the test element pattern (1111).
In one possible embodiment of the present application, the test element region (110) further comprises a first auxiliary layer (115) and a second auxiliary layer (116), the first auxiliary layer (115) is disposed on a side of the anode (111) facing the cathode (113), and the second auxiliary layer (116) is disposed on a side of the cathode (113) facing the anode (111);
the first auxiliary layer (115) comprises a hole injection layer (115a) and a hole transport layer (115b), and the second auxiliary layer (116) comprises an electron injection layer (116a), an electron transport layer (116b), and a hole blocking layer (116 c);
the hole injection layer (115a) is arranged on the side of the anode (111) facing the cathode (113), and the hole transport layer (115b) is arranged on the side of the hole injection layer (115a) far away from the anode (111); the electron injection layer (116a) is arranged on the side of the cathode (113) facing the anode (111), the electron transport layer (116b) is arranged on the side of the electron injection layer (116a) facing away from the cathode (113), and the hole blocking layer (116c) is arranged on the side of the electron transport layer (116b) facing the anode (111).
In a second aspect of the present application, a display screen detection system (10) is further provided, where the display screen detection system (10) includes a pixel position accuracy detection device (200), an effective light emitting area performance detection device (300), an electrical signal providing device (400), and the display screen (100) of the first aspect, where the display screen (100) further includes an effective light emitting area (130), and the panel pad area (120) further includes an independent pad for receiving an electrical signal to light the effective light emitting area (130);
the pixel position precision detection device (200) is used for acquiring a first image of the test component area (110) under white light irradiation and a second image of the test component area (110) after being lightened, and detecting the position precision of a pixel evaporation area of the display screen (100) according to the first image and the second image, wherein the pixel position precision detection device (200) comprises a white light source (210) for providing white light illumination;
the effective light-emitting area performance detection device (300) is used for performing performance detection on the lighted effective light-emitting area (130), wherein the performance detection comprises characteristic detection and defect detection;
the electrical signal providing device (400) comprises a plurality of metal pins corresponding to the positions of the independent bonding pads in the panel bonding pad area (120), each metal pin is used for providing an electrical signal, and when each metal pin is in contact with the corresponding independent bonding pad, the electrical signal providing device (400) is used for providing an electrical signal for lighting the test component area (110) and the effective light emitting area (130).
In one possible embodiment of the present application, the electrical signal providing device (400) provides a high-level gate signal to the anode of the test component area (110) and a low-level gate signal to the cathode of the test component area (110) through the metal pins.
In a third aspect of the present application, there is also provided a display screen detection method, which is applied to the display screen detection system (10) in the second aspect, and the display screen detection method includes:
moving the pixel position precision detection device (200) above the test component area (110), and starting a white light source (210) to illuminate the test component area (110), so as to obtain a first image of the test component area (110) under the irradiation of white light;
turning off a white light source (210) of the pixel position accuracy detection device (200);
connecting metal pins of the electrical signal providing device (400) with independent pads of the display screen (100), and lighting the test component area (110) and the effective light emitting area (130);
acquiring a second image of the test component area (110) through the pixel position precision detection equipment (200), and detecting the position precision of a pixel evaporation area of the display screen (100) according to the first image and the second image;
and moving the lens of the effective light emitting area performance detection device (300) to the position above the effective light emitting area (130), acquiring the image of the effective light emitting area (130), and detecting the light emitting area performance of the effective light emitting area (130) through the image of the effective light emitting area (130).
In a fourth aspect of the present application, there is also provided a display screen detection method, which is applied to the display screen detection system (10) in the second aspect, and the display screen detection method includes:
connecting metal pins of the electrical signal providing device (400) with independent pads of the display screen (100), and lighting the test component area (110) and the effective light emitting area (130);
moving the pixel position accuracy detection device (200) to the upper part of the test component area (110) to obtain a second image after the test component area (110) is lightened;
moving an effective light emitting zone performance detection device (300) above the effective light emitting zone (130), acquiring an image of the effective light emitting zone (130), and performing light emitting zone performance detection on the effective light emitting zone (130) through the image of the effective light emitting zone (130);
separating metal pins of the electrical signal providing device (400) from independent pads of the display screen (100);
the pixel position accuracy detection equipment (200) starts a white light source (210) to illuminate the test component area (110), obtains a first image of the test component area (110) under the irradiation of white light, and detects the position accuracy of a pixel evaporation area of the display screen (100) according to the first image and the second image.
The application provides a display screen, a display screen detection system and a display screen detection method, wherein two independent bonding pads which are respectively electrically connected with an anode and a cathode of a testing assembly area are additionally arranged in a panel bonding pad area of the display screen, and pixels in the testing assembly area can be lightened through electric signals received by the two independent bonding pads, so that a pixel evaporation area in the testing assembly area emits light. When the position accuracy of the pixel evaporation area of the display screen is detected, the image of the test component area under the irradiation of white light is obtained and the image of the test component area is lightened through the electric signal input by the newly added independent pad, an ultraviolet light source does not need to be additionally and independently configured, and the production cost can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic diagram of a conventional apparatus for detecting the position accuracy of a pixel evaporation region;
FIG. 2 is a schematic view of a display screen provided in a first embodiment of the present application;
FIG. 3 is a schematic diagram of a layer structure of a test element area according to a first embodiment of the present disclosure;
FIG. 4 is a schematic plan view illustrating a relative position between a pixel evaporation region and a test element pattern according to a first embodiment of the present disclosure;
fig. 5 is a schematic view of an apparatus architecture for detecting position accuracy of a pixel evaporation region according to a first embodiment of the present application;
fig. 6 is a schematic layer structure diagram of an effective light emitting area according to a first embodiment of the present application;
FIG. 7 is a second schematic layer structure diagram of a test device area according to the first embodiment of the present application;
FIG. 8 is a block diagram of a display screen inspection system according to a second embodiment of the present application;
fig. 9 is a schematic flowchart of a display screen detection method according to a third embodiment of the present application;
FIG. 10 is a schematic diagram of an algorithm for detecting the position accuracy of a pixel deposition area based on the partially enlarged portion of FIG. 4;
fig. 11 is a schematic flowchart of a display screen detection method according to a fourth embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a conventional apparatus for detecting a position accuracy of a pixel evaporation region, and a display panel 100 is generally detected by using the pixel position accuracy detecting apparatus 200' shown in fig. 1. Specifically, the step of detecting the position accuracy of the pixel evaporation region is as follows:
first, the pixel position accuracy detecting device 200' is moved to a position above a Test Element Group (TEG) area of the display screen 100;
then, turning on a white light source 210 'on the pixel position accuracy detection device 200' to illuminate the test component area, and acquiring a first image of the test component area under white light illumination, wherein a contour pattern of the position reference component can be acquired in the first image;
then, the white light source 210 ' of the pixel position accuracy detection device is turned off, the ultraviolet lamp 220 ' on the pixel position accuracy detection device 200 ' is turned on, the pixel evaporation area is activated to emit light under the irradiation of ultraviolet light, a second image of the test assembly area under the irradiation of the ultraviolet light is obtained, and the outline pattern of the pixel evaporation area can be obtained in the second image;
and finally, calculating according to the first image and the second image to obtain the position precision of the pixel evaporation region.
In the above-described detection process, the white light source 210 ' and the ultraviolet light source 220 ' need to be provided for the pixel position accuracy detection device 200 ', and the white light source 210 ' and the ultraviolet light source 220 ' need to be replaced periodically, which increases the cost of the pixel evaporation region position accuracy detection. In order to solve the technical problem, the inventor innovatively designs the following technical scheme that the test component area image comprising the outline pattern of the pixel evaporation area is obtained under the condition that the ultraviolet light source 220' is not required to irradiate and excite the pixel evaporation area to emit light, so that the production cost is reduced. Specific implementations of the present application will be described in detail below with reference to the accompanying drawings.
First embodiment
Referring to fig. 2, fig. 2 is a schematic structural diagram of a display screen 100 according to a first embodiment of the present application.
The display Panel 100 provided by the present embodiment may include a testing component area 110 and a Panel Pad area 120 for detecting the position accuracy of the pixel evaporation area.
Referring to fig. 3 and 4, the testing device region 110 may include an anode 111, a light-emitting layer 112 and a cathode 113, wherein the light-emitting layer 112 is disposed between the anode 111 and the cathode 113. The light emitting layer 112 may include a first pixel evaporation region 1121, a test element pattern 1111 having a gray scale difference with the anode 111 is disposed on a side of the anode 111 facing the cathode 113, and the test element pattern 1111 may include a standard test element 1111a for calibrating a position of the first pixel evaporation region 1121.
When the display screen 100 is manufactured, a precise metal mask (FMM) may be used to evaporate a light emitting layer on the surface of Low Temperature Polysilicon (LTPS), and to deposit patterns of different colors (e.g., R (red), G (green), and B (blue)) on different positions of the surface of the low temperature polysilicon. If the metal mask plate is misaligned, the offset of the pixel evaporation area position is increased along with the extending direction of the screen. Therefore, a plurality of test element zones 110 are designed in the extending direction of the display screen 100, and the pixel vapor deposition zone position accuracy detection is performed on these test element zones 110, so that it is possible to detect whether or not a pixel vapor deposition zone having an excessive positional accuracy deviation of the pixel vapor deposition zone exists in the entire display screen 100.
The panel pad region 120 may include two independent pads 120a and 120b electrically connected to the anode 111 and the cathode 113, respectively. Specifically, the anode 111 may be electrically connected to the individual pad 120a through a wire Line1, and the cathode 113 may be electrically connected to the individual pad 120b through a wire Line 2.
In the above scheme, by adding the independent pads 120a and 120b to the panel pad region 120, the pixel evaporation region in the test element region 110 can be made to emit light (i.e., the test element region 110 is lighted) by the electrical signals received by the independent pads 120a and 120 b. Referring to fig. 5, when the position accuracy of the pixel evaporation region is subsequently detected on the display screen 100, only the image of the test component region 110 under the irradiation of white light needs to be obtained and the image of the test component region 110 needs to be lightened, and an additional ultraviolet light source does not need to be separately configured, so that the production cost is reduced.
In the present embodiment, referring to fig. 2 again, the display screen 100 further includes an Active Area (Active Area) 130. Referring to fig. 6, fig. 6 shows a schematic structural diagram of the effective light emitting area 130, wherein the effective light emitting area 130 includes an anode 111, a light emitting layer 112 and a cathode 113. The light-emitting layer 112 includes a pixel deposition region R, a pixel deposition region G, and a pixel deposition region B capable of emitting light of three colors, red, green, and blue.
Since the red light, the green light and the blue light have different wavelengths and the loss through the structure above the light emitting layer is different, the longer the wavelength, the larger the loss, and in order to make each pixel in the effective light emitting region 130 have the same display effect under the same condition, in this embodiment, the light emitting intensity of the red sub-pixel and the green sub-pixel needs to be increased to offset the loss in transmission. For this, the compensation layer 114 may be additionally provided under the pixel evaporation regions of the red and green sub-pixels, and specifically, the compensation layer 114 may include a pixel evaporation region R 'and a pixel evaporation region G'. And a pixel evaporation region R 'is arranged below the pixel evaporation region R of the red sub-pixel, and a pixel evaporation region G' is arranged below the pixel evaporation region of the green sub-pixel G, wherein the thickness of the pixel evaporation region R 'is greater than that of the pixel evaporation region G'. The holes transmitted by the anode 111 and the electrons transmitted by the cathode 113 when the compensation layer 114 is combined will activate the pixel evaporation regions R 'and G' in the compensation layer to emit light of corresponding colors, so as to enhance the light emission intensity of the red and green sub-pixels. In this case, the display of the display panel 100 is related to the positional accuracy of not only the pixel evaporation regions (pixel evaporation region R, pixel evaporation region G, and pixel evaporation region B) in the light-emitting layer 112 but also the pixel evaporation regions (pixel evaporation region R 'and pixel evaporation region G') in the compensation layer 114.
Referring to fig. 4 and 7, in the embodiment, the test element region 110 may further include a compensation layer 114, the compensation layer 114 is located between the anode 111 and the cathode 113, the compensation layer 114 includes a second pixel evaporation region 1141 (pixel evaporation regions R 'and G' in the figure), the light emitting layer 112 does not overlap with the compensation layer 114, and the standard test element 1111a in the test element pattern 1111 is further used to calibrate the position of the second pixel evaporation region 1141.
The testing component region 110 and the active light emitting region 130 can simultaneously perform evaporation on the light emitting layer 112 and the compensation layer 114, and therefore, it can be understood that position accuracy detection can be performed on the first pixel evaporation region 1121 (the pixel evaporation region R, G, B in the figure) and the second pixel evaporation region 1141 in the testing component region 110, so that position accuracy detection on the pixel evaporation region of the display screen 100 can be achieved.
In this embodiment, the relative positions of the first pixel evaporation region 1121 and the second pixel evaporation region 1141 in different test element regions 110 may be different, and in order to ensure that the first pixel evaporation region 1121 and the second pixel evaporation region 1141 in different test element regions 110 can be activated and lighted, in this embodiment, the anode 111 and the cathode 113 completely cover the light emitting layer 112 and the compensation layer 114 from two sides of the light emitting layer 112 and the compensation layer 114, respectively.
Further, referring to fig. 4 again, in the present embodiment, the first pixel evaporation region 1121 and the second pixel evaporation region 1141 are distributed in a rectangular shape, wherein the rectangular distribution means that the first pixel evaporation region 1121 or the second pixel evaporation region 1141 are disposed on a side or a vertex of the rectangular shape. A standard test component 1111a is disposed between any adjacent pixel evaporation regions (e.g., two adjacent first pixel evaporation regions 1121 and second pixel evaporation regions 1141, and two adjacent second pixel evaporation regions 114).
Further, in this embodiment, the test element pattern 1111 may further include a calibration mark 1111b, and the calibration mark 1111b may be located at the center of the test element pattern 1111. When the pixel position accuracy detecting device 200 is moved to above the testing module area 110, the pixel position accuracy detecting device 200 can calibrate the position by the calibration mark 1111b, and at the same time, can establish a coordinate system by using the calibration mark 1111b as a coordinate origin to obtain the position coordinates of the standard testing module 1111a, the first pixel evaporation area 1121 and the second pixel evaporation area 1141 in the coordinate system, so as to perform the pixel evaporation area position accuracy detection in the following.
In order to improve the light emitting efficiency of the light emitting layer 112, referring to fig. 6 and 7, in the present embodiment, each of the test element region 110 and the effective light emitting region 130 may further include a first auxiliary layer 115 and a second auxiliary layer 116, the first auxiliary layer 115 is disposed on a side of the anode 111 facing the cathode 113, and the second auxiliary layer 116 is disposed on a side of the cathode 113 facing the anode 111. The first auxiliary layer 115 is used to transport holes, the second auxiliary layer 116 is used to transport electrons, and the holes and the electrons are recombined in the light-emitting layer 112 to excite the pixel evaporation layer 1121 to emit light.
Further, referring to fig. 6 and 7 again, the first auxiliary Layer 115 may include a Hole Injection Layer (HIL) 115a and a Hole Transport Layer (HTL) 115 b. The second auxiliary Layer 116 may include an Electron Injection Layer (EIL) 116a, an Electron Transport Layer (ETL) 116b, and a Hole Blocking Layer (HBL) 116 c.
A hole injection layer 115a is disposed on the side of the anode 111 facing the cathode 113, and a hole transport layer 115b is disposed on the side of the hole injection layer 115a remote from the anode 111. The electron injection layer 116a is disposed on a side of the cathode 113 facing the anode 111, and the electron transport layer 116b is disposed on a side of the electron injection layer 116a away from the cathode 113. The hole blocking layer 116c is provided on the side of the electron transport layer 116b facing the anode 111.
In this embodiment, the first auxiliary Layer 115 may further include an Electron Blocking Layer (EBL), and an Electron Blocking Layer (not shown) may be disposed on a side of the hole transport Layer 114b facing the cathode 113.
Above-mentioned scheme can light test assembly district 110 through newly-increased independent pad, need not additionally adopt the ultraviolet light source, reduction in production cost, in addition, above-mentioned display screen 110's design can also ensure that all pixel coating by vaporization districts homoenergetic in test assembly district 110 are lighted to carry out pixel coating by vaporization district position accuracy detection in the follow-up.
Second embodiment
Referring to fig. 8, the present embodiment further provides a display panel inspection system 10, the display panel inspection system 10 includes a pixel position accuracy inspection device 200, an effective light emitting area performance inspection device 300, an electrical signal providing device 400, and the display panel 100 according to the first embodiment, wherein the panel pad area 120 of the display panel 100 further includes an independent pad for receiving an electrical signal to light the effective light emitting area 130.
The pixel position accuracy detecting device 200 is configured to obtain a first image of the test component area 110 under the irradiation of the white light and a second image of the test component area 110 after being lighted, and detect the position accuracy of the pixel evaporation area of the display screen 100 according to the first image and the second image, where the pixel position accuracy detecting device 200 may include a white light source 210 for providing the white light for illumination.
The device 300 for detecting performance of the active light emitting area 130 after being lit is used for detecting performance, wherein the performance detection includes characteristic detection and defect detection.
The electrical signal providing apparatus 400 includes a plurality of metal pins (pins) corresponding to the respective independent pad positions in the panel pad region 120, each of the metal pins being used to provide an electrical signal, and the electrical signal providing apparatus 400 is used to provide an electrical signal for lighting the test element region 110 and the active light emitting region 130 when each of the metal pins is in contact with the corresponding independent pad.
Further, in the embodiment, the electrical signal providing apparatus 400 may provide a High-level gate signal (High voltage of gate signal) to the anode of the testing device region 110 and provide a Low-level gate signal (Low voltage of gate signal) to the cathode of the testing device region 110 through metal pins.
The display screen detection system 10 can simultaneously light the test component area 110 and the effective light emitting area 130 when the metal pins contact with the corresponding independent bonding pads, and can simultaneously detect the position accuracy of the pixel evaporation area and the performance of the effective light emitting area of the display screen 100 at one detection station. Thus, the transmission time of the display screen 100 between the detection stations can be reduced, and the production efficiency of the display screen 100 can be improved. In addition, since the testing environment of the display panel 100 needs to be performed in an inert environment (e.g., a nitrogen environment), reducing one testing station can also save the equipment (e.g., an inert gas chamber and an accessory equipment such as a purifier) for providing inert gas required by the station, and further, reduce the manufacturing cost of the display panel 100.
Third embodiment
Referring to fig. 5 and 9 in combination, the present embodiment provides a method for detecting a display screen by using the display screen detection system 10 in the second embodiment.
Step S110, the pixel position accuracy detecting device 200 is moved to the upper side of the test component area 110, and the white light source 210 is turned on to illuminate the test component area 110, so as to obtain a first image of the test component area 110 under the irradiation of white light.
Specifically, in the process of moving the pixel position accuracy detecting device 200 above the test component area 110, the pixel position accuracy detecting device 200 may be aligned with the calibration mark 1111b in the test component area 110 to calibrate the position of the pixel position accuracy detecting device 200 by the calibration mark 1111 b. Since the test element pattern 1111 has a gray level difference with respect to the anode 111, the first image is gray-level processed to obtain an outline of the test element pattern 1111.
In step S120, the white light source 210 of the pixel position accuracy detecting device 200 is turned off.
In step S130, the metal pins of the electrical signal providing device 400 are connected to the independent pads of the display screen 100, and the test element region 110 and the active light emitting region 130 are lit.
Specifically, the metal pin area of the electrical signal providing device 400 and the panel pad area 120 of the display screen 100 may be first aligned, and then the metal pins of the electrical signal providing device 400 are connected to the individual pads of the display screen 100 by the press-fit device, and the electrical signal providing device 400 lights up the test element area 110 and the active light emitting area 130 by the provided electrical signals.
In step S140, the pixel position accuracy detecting device 200 obtains a second image of the testing component area 110, and detects the position accuracy of the pixel evaporation area of the display screen 100 according to the first image and the second image. After the second image is obtained, the second image may be processed to obtain the outline of the pixel evaporation region.
The process of obtaining the position accuracy of the pixel evaporation region through the final calculation is described in detail below. Referring to fig. 10, fig. 10 is a partially enlarged view of fig. 4.
First, an image processing algorithm is used to obtain the profile of the standard test module 1111a (TEG 1 in the figure), the standard test module 1111a (TEG 2 in the figure) and the target pixel evaporation region 1141 (pixel evaporation region R' in fig. 4), wherein the standard TEG1 and the standard TEG2 are respectively located at two adjacent sides of the target pixel evaporation region 1141.
Then, central axes L1 and L2 of the profile of the standard TEG1 and the profile of the standard TEG2 in the direction toward the target pixel evaporation region, respectively, are obtained, and an intersection O1 of the central axes L1 and L2 is a theoretical center position of the target pixel evaporation region 1141.
Then, two central axes of the contour of the target pixel evaporation region 1141 are obtained, and an intersection O2 of the two central axes is the actual central position of the target pixel point. Since the pixel position accuracy detection device 200 aligns the calibration mark 1111b, the calibration mark 1111b can be selected as a coordinate origin to establish a cartesian coordinate system, and coordinate values of the intersection O1 and the intersection O2 can be obtained, so that offsets Δ X, Δ Y of the intersection O2 with respect to the intersection O1 on the horizontal and vertical coordinates, that is, offsets of the pixel position can be obtained. The larger the offset of the pixel position, the lower the position accuracy of the pixel evaporation region, and the smaller the offset of the pixel position, the higher the position accuracy of the pixel evaporation region.
In step S150, the device 300 for detecting performance of the active light-emitting area is moved to the upper side of the active light-emitting area 130, to acquire the image of the active light-emitting area 130, and detect the performance of the active light-emitting area 130 through the image of the active light-emitting area 130.
In the present embodiment, the effective light-emitting area performance detection apparatus 300 may include a characteristic detection lens and a defect detection lens, and after moving above the effective light-emitting area 130, an image for characteristic detection and an image for defect detection may be obtained through the above-described lenses, and characteristic detection and defect detection of the effective light-emitting area 130 are performed according to the existing characteristic detection system and defect detection system.
In the above method flow, it is understood that step S140 and step S150 may be performed simultaneously, or may be performed sequentially, for example, step S140 is performed first and then step S150 is performed, or step S150 is performed first and then step S140 is performed. Meanwhile, the flow of the method can be automatically controlled by a computer program to realize full-automatic detection; the control can also be performed manually.
According to the technical scheme, the test component area 110 and the effective light emitting area 130 are simultaneously lightened, so that the position accuracy detection of the pixel evaporation area and the performance detection of the effective light emitting area can be simultaneously carried out at one detection station. The number of detection stations can be reduced, the transmission time of the display screen between the detection stations is shortened, and the production efficiency of the display screen is improved. Reducing one inspection station may also save the equipment required for the station to provide inert gas, further reducing the manufacturing cost of the display screen 100.
Fourth embodiment
Referring to fig. 11, the method for detecting a display screen by using the display screen detection system 10 in the second embodiment may include the following steps. This fourth embodiment is substantially the same as the third embodiment except that the order of white light illumination of the test element area 110 to acquire an image and illumination of the test element area 110 to acquire an image is different, as described in detail below.
In step S210, the metal pins of the electrical signal providing device 400 are connected to the independent pads of the display screen 100, and the test element region 110 and the active light emitting region 130 are lit.
Specifically, the metal pin area of the electrical signal providing device 400 and the panel pad area 120 of the display screen 100 may be first aligned, and then the metal pins of the electrical signal providing device 400 are connected to the individual pads of the display screen by the press-fit device, and the electrical signal providing device 400 lights up the test element area 110 and the active light emitting area 130 by the provided electrical signals.
In step S220, the pixel position accuracy detecting apparatus 200 moves the lens above the test element region 110, and obtains a second image of the test element region 110 after being lit up.
Specifically, in the process of moving the pixel position accuracy detecting device 200 above the test component area 110, the pixel position accuracy detecting device 200 may be aligned with the calibration mark 1111b in the test component area 110 to calibrate the position of the pixel position accuracy detecting device 200 by the calibration mark 1111 b. The second image is processed to obtain the outline of the pixel evaporation area.
In step S230, the lens of the device 300 for detecting performance of the active light emitting area is moved to the position above the active light emitting area 130, so as to acquire the image of the active light emitting area 130, and detect the performance of the active light emitting area 130 through the image of the active light emitting area 130.
In the present embodiment, the effective light-emitting area performance detection apparatus 300 may include a characteristic detection lens and a defect detection lens, and after moving above the effective light-emitting area 130, an image for characteristic detection and an image for defect detection may be obtained through the above-described lenses, and characteristic detection and defect detection of the effective light-emitting area 130 are performed according to the existing characteristic detection system and defect detection system.
In step S240, the metal pins of the electrical signal providing apparatus 400 are separated from the independent pads of the display screen 100.
Step S250, the white light source 210 of the pixel position accuracy detecting device 200 is turned on to illuminate the testing component area 110, and a first image of the testing component area 110 under white light illumination is obtained, and the position accuracy of the pixel evaporation area of the display screen 100 is detected according to the first image and the second image. Since the test element pattern 1111 has a gray scale difference with respect to the anode 111, the first image is gray scale processed to obtain the profile of the test element pattern 1111.
The specific process of detecting the position accuracy of the pixel evaporation region of the display screen 100 according to the first image and the second image can be referred to the foregoing description, and further description is omitted here.
In the above method flow, it can be understood that step S220 and step S230 may be performed simultaneously, or may be performed in a sequential order, and step S220 and step S230 must be performed first, or step S220 and step S230 must be performed first. Meanwhile, the flow of the method can be automatically controlled by a computer program to realize full-automatic detection; the control can also be performed manually.
According to the display screen, the display screen detection system and the display screen detection method, two independent bonding pads which are respectively electrically connected with the anode and the cathode of the testing component area are additionally arranged in the panel bonding pad area of the display screen. When the position precision of the pixel evaporation area of the display screen is detected, the image of the testing component area under the irradiation of white light is obtained, and the image of the testing component area is lightened by the electric signal input by the newly added independent pad, so that an ultraviolet light source is not required to be additionally configured, and the production cost is reduced. Meanwhile, the panel pad area also comprises an independent pad for lightening the effective luminous area, when the metal pins are contacted with the corresponding independent pad, the test assembly area and the effective luminous area can be lightened simultaneously, and the position precision detection of the pixel evaporation area and the performance detection of the effective luminous area can be simultaneously carried out at one detection station. Therefore, the number of the assembly line detection stations and the transmission time of the display screen between the detection stations can be reduced, and the production efficiency of the display screen is improved. In addition, the equipment for providing inert gas required by the detection station can be saved by reducing one detection station, and the manufacturing cost of the display screen is further reduced.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A display screen (100) is characterized in that the display screen (100) comprises a panel pad area (120) and a test component area (110) for detecting the position accuracy of a pixel evaporation area;
the test component region (110) comprises an anode (111), a light-emitting layer (112) and a cathode (113), the light-emitting layer (112) is located between the anode (111) and the cathode (113), the light-emitting layer (112) comprises a first pixel evaporation region (1121), one side of the anode (111) facing the cathode (113) is provided with a test component pattern (1111), and the test component pattern (1111) comprises a standard test component (1111a) for calibrating the position of the first pixel evaporation region (1121);
the panel pad region (120) includes two independent pads electrically connected to the anode (111) and the cathode (113), respectively;
the test element region 110 further includes a compensation layer (114), the compensation layer (114) is located between the anode (111) and the cathode (113), the compensation layer (114) includes a second pixel evaporation region (1141), the light emitting layer (112) does not overlap with the compensation layer (114), and a standard test element (1111a) in the test element pattern (1111) is further used to calibrate a position of the second pixel evaporation region (1141).
2. The display screen (100) of claim 1, wherein the anode (111) and the cathode (113) completely cover the light-emitting layer (112) and the compensation layer (114) from both sides of the light-emitting layer (112) and the compensation layer (114), respectively.
3. The display screen (100) of claim 2, wherein the first pixel evaporation area (1121) and the second pixel evaporation area (1141) are rectangular, and the standard test component (1111a) is disposed between any two adjacent pixel evaporation areas.
4. The display screen (100) of claim 3, wherein the test element pattern (1111) further comprises a calibration mark (1111b), the calibration mark (1111b) being located at the center of the test element pattern (1111).
5. The display screen (100) of claim 4, wherein the test component area (110) further comprises a first auxiliary layer (115) and a second auxiliary layer (116), the first auxiliary layer (115) being disposed on a side of the anode (111) facing the cathode (113), the second auxiliary layer (116) being disposed on a side of the cathode (113) facing the anode (111);
the first auxiliary layer (115) comprises a hole injection layer (115a) and a hole transport layer (115b), and the second auxiliary layer (116) comprises an electron injection layer (116a), an electron transport layer (116b), and a hole blocking layer (116 c);
the hole injection layer (115a) is arranged on the side of the anode (111) facing the cathode (113), and the hole transport layer (115b) is arranged on the side of the hole injection layer (115a) far away from the anode (111); the electron injection layer (116a) is arranged on the side of the cathode (113) facing the anode (111), the electron transport layer (116b) is arranged on the side of the electron injection layer (116a) facing away from the cathode (113), and the hole blocking layer (116c) is arranged on the side of the electron transport layer (116b) facing the anode (111).
6. A display screen inspection system (10), the display screen inspection system (10) comprising a pixel position accuracy inspection device (200), an active light emitting area performance inspection device (300), an electrical signal providing device (400), and the display screen (100) of any one of claims 1 to 5, wherein the display screen (100) further comprises an active light emitting area (130), the panel pad area (120) further comprises a separate pad for receiving an electrical signal to illuminate the active light emitting area (130);
the pixel position precision detection device (200) is used for acquiring a first image of the test component area (110) under white light irradiation and a second image of the test component area (110) after being lightened, and detecting the position precision of a pixel evaporation area of the display screen (100) according to the first image and the second image, wherein the pixel position precision detection device (200) comprises a white light source (210) for providing white light illumination;
the effective luminous zone performance detection device (300) is used for performing performance detection on the lighted effective luminous zone (130), wherein the performance detection comprises characteristic detection and defect detection;
the electrical signal providing device (400) comprises a plurality of metal pins corresponding to the positions of the independent bonding pads in the panel bonding pad area (120), each metal pin is used for providing an electrical signal, and when each metal pin is in contact with the corresponding independent bonding pad, the electrical signal providing device (400) is used for providing an electrical signal for lighting the test component area (110) and the effective light emitting area (130).
7. The display screen detection system (10) of claim 6, wherein the electrical signal providing device (400) provides a high level gate signal to the anode of the test component area (110) and a low level gate signal to the cathode of the test component area (110) through the metal pins.
8. A display screen detection method applied to the display screen detection system (10) of claim 6 or 7, the display screen detection method comprising:
moving the pixel position precision detection device (200) to the upper part of the test component area (110), and starting a white light source (210) to illuminate the test component area (110) to obtain a first image of the test component area (110) under the irradiation of white light;
turning off a white light source (210) of the pixel position accuracy detection device (200);
connecting metal pins of the electrical signal providing device (400) with independent pads of the display screen (100), and lighting the test component area (110) and the effective light emitting area (130);
acquiring a second image of the test component area (110) through the pixel position precision detection equipment (200), and detecting the position precision of a pixel evaporation area of the display screen (100) according to the first image and the second image;
and moving the lens of the effective light emitting area performance detection device (300) to the position above the effective light emitting area (130), acquiring the image of the effective light emitting area (130), and detecting the light emitting area performance of the effective light emitting area (130) through the image of the effective light emitting area (130).
9. A display screen detection method applied to the display screen detection system (10) of claim 6 or 7, the display screen detection method comprising:
connecting metal pins of the electrical signal providing device (400) with independent pads of the display screen (100), and lighting the test component area (110) and the effective light emitting area (130);
moving the pixel position accuracy detection device (200) to the upper part of the test component area (110) to obtain a second image after the test component area (110) is lightened;
moving an effective light emitting zone performance detection device (300) above the effective light emitting zone (130), acquiring an image of the effective light emitting zone (130), and performing light emitting zone performance detection on the effective light emitting zone (130) through the image of the effective light emitting zone (130);
separating metal pins of the electrical signal providing device (400) from independent pads of the display screen (100);
the pixel position accuracy detection equipment (200) starts a white light source (210) to illuminate the test component area (110), obtains a first image of the test component area (110) under white light irradiation, and detects the position accuracy of a pixel evaporation area of the display screen (100) according to the first image and the second image.
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