Light-emitting device detection device and method

Abstract

The embodiment of the invention provides a light-emitting device detection device and method, and relates to the technical field of display. In the light-emitting device detection device and method, the light-emitting device grabbing unit grabs the light-emitting device, the second coil in the light-emitting grabbing unit induces the change of the electromagnetic signal in the first coil to generate the induction current used for driving the light-emitting device, and the detection unit detects whether the light-emitting device normally emits light under the action of the induction current. Compared with the prior art, physical contact points and connecting lines required in the test can be reduced, the possibility of damaging the light-emitting device by manual intervention is reduced, meanwhile, the performance of the light-emitting device can be effectively detected, and the detection accuracy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a light emitting device detection device and method. BACKGROUND

[0002] Micro-LED (Micro-LED) as a new generation of display technology, has the advantages of high brightness, high resolution, high luminous efficiency, low power consumption, high contrast, long life, etc., and has good application prospect in large-size display, VR / AR, vehicle display and other fields. In addition, the Micro-LED display screen is different from other LED display screens, and the pixels in the Micro-LED display screen are composed of single light emitting devices.

[0003] In the related art, the light emitting device is usually transferred to the driving backboard through a mass transfer technology. Since the mass transfer technology cannot achieve 100% yield, after the mass transfer is completed, the positions of the light emitting devices with defects (such as positions without light emitting devices) need to be repaired, but the light emitting devices used for repair may have defects (such as not emitting light or emitting light with brightness not meeting the requirements), and after repair, it cannot be guaranteed to achieve 100% yield. SUMMARY

[0004] In order to at least overcome the above deficiencies in the prior art, the purpose of the present application is to provide a light emitting device detection device and method.

[0005] In a first aspect, an embodiment of the present application provides a light emitting device detection device, which comprises an electromagnetic signal generating unit, a detection unit, and a light emitting device grabbing unit.

[0006] The electromagnetic signal generating unit comprises a first coil for generating an electromagnetic signal.

[0007] The light emitting device grabbing unit comprises an electrode lead-through part for contacting the electrode of the light emitting device when grabbing the light emitting device, and a second coil connected with the electrode lead-through part and forming a conductive loop, the second coil is used for inducing the electromagnetic signal generated by the first coil, and providing an induced current to the light emitting device based on the changed electromagnetic signal.

[0008] The detection unit is used for detecting whether the light emitting device normally emits light under the action of the induced current.

[0009] In a possible implementation manner, the electromagnetic signal generating unit further comprises a power supply and a frequency converter.

[0010] The power supply, the frequency converter and the first coil are connected in series to form a conductive loop, and the first coil generates an electromagnetic signal based on the alternating current provided by the power supply and the frequency converter.

[0011] In a possible implementation, the light emitting device grabbing unit comprises a main body and a conductive connecting part;

[0012] The electrode connecting part and the second coil are respectively located on opposite sides of the main body, and the conductive connecting part penetrates through the main body and is electrically connected with the electrode connecting part and the second coil respectively.

[0013] In a possible implementation, the conductive connecting part comprises a first conductive connecting part and a second conductive connecting part, and the electrode connecting part comprises a first electrode connecting part and a second electrode connecting part;

[0014] The two ends of the first conductive connecting part are connected with the first electrode connecting part and the second coil respectively, and the two ends of the second conductive connecting part are connected with the second electrode connecting part and the second coil respectively.

[0015] In a possible implementation, the light emitting device grabbing unit further comprises an adhesive part;

[0016] The adhesive part is located on a side of the main body away from the second coil, the adhesive part is located between the first electrode connecting part and the second electrode connecting part, and the adhesive part grabs the light emitting device by adhesion.

[0017] In a possible implementation, the detection unit comprises an image acquisition subunit and an image processing subunit connected with each other;

[0018] The image acquisition subunit is arranged on a side of the first coil, and the image acquisition subunit is configured to acquire a state image of the light emitting device under the action of the induced current;

[0019] The image processing subunit is configured to process the state image and determine whether the light emitting device normally emits light under the action of the induced current.

[0020] In a second aspect, the embodiments of the present application further provide a light emitting device detection method, applied to the light emitting device detection device in any one of the first aspect, and the method comprises:

[0021] Grabbing a light emitting device;

[0022] Moving the light emitting device above the first coil;

[0023] Controlling the first coil to generate an electromagnetic signal, and causing the second coil to generate an induced current based on the electromagnetic signal generated by the first coil;

[0024] Detecting whether the light emitting device normally emits light under the action of the induced current.

[0025] In a possible implementation, the step of grabbing the light emitting device comprises:

[0026] The light emitting device is grabbed by the adhesive part in the light emitting device grabbing unit.

[0027] In a possible implementation, the step of detecting whether the light emitting device emits light normally under the action of the induced current comprises:

[0028] The state image of the light emitting device under the action of the induced current is acquired by the detection unit, and the state image is processed to determine whether the light emitting device emits light normally under the action of the induced current.

[0029] In a possible implementation, after the step of detecting whether the light emitting device emits light normally under the action of the induced current, the method further comprises:

[0030] When it is detected that the light emitting brightness of the light emitting device reaches a target condition, the light emitting device is determined as a normal light emitting device.

[0031] When it is detected that the light emitting brightness of the light emitting device does not reach a target condition, the light emitting device is determined as a damaged light emitting device.

[0032] Based on any one of the above aspects, the light emitting device detection device and method provided by the embodiments of the present application, the light emitting device grabbing unit grabs the light emitting device, the second coil in the light emitting grabbing unit induces the change of the electromagnetic signal in the first coil to generate the induced current for driving the light emitting device, and the detection unit detects whether the light emitting device emits light normally under the action of the induced current. Compared with the prior art, the physical contact point and the connection line required in the traditional test method can be reduced, the possibility of damage to the light emitting device caused by manual intervention can be reduced, and the performance of the light emitting device can be effectively detected, thereby improving the accuracy of detection. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be called in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0034] Figure 1 A structural schematic diagram of the light emitting device detection device provided by the embodiments of the present application;

[0035] Figure 2 A structural schematic diagram of the light emitting device provided by the embodiments of the present application;

[0036] Figure 3 Partial structure diagram of the light emitting device detection apparatus provided by the embodiment of the present application Figure 1 ;

[0037] Figure 4 Partial structure diagram of the light emitting device detection apparatus provided by the embodiment of the present application Figure 2 ;

[0038] Figure 5 Flow diagram of the light emitting device detection method provided by the embodiment of the present application

[0039] Figure 6 Connection diagram of the light emitting device detection apparatus provided by the embodiment of the present application DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0042] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0043] In the description of the present application, it should be noted that the orientation or position relationship indicated by the terms “up”, “down” and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the product of the present application is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. In addition, the terms “first”, “second” and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present application, it should also be noted that unless specifically defined and limited otherwise, the terms "set", "connected", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] It should be noted that the different features in the embodiments of the present application can be combined with each other without conflict.

[0046] To solve the problems mentioned in the background art, the inventors have found that one of the main reasons affecting the yield after repair is that the light emitting device used for repair itself has defects. Since the size of the light emitting device is generally small, it is difficult to detect the light emitting device used for repair in advance.

[0047] In order to solve the above-mentioned technical problems, the inventors have innovatively designed the following technical solutions, and the specific implementation schemes of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the defects in the above prior art solutions are the result of the inventors' careful research after practice, so the discovery process of the above technical problems and the solutions proposed by the present embodiment to solve the above problems should be the contribution of the inventors to the present application, and should not be understood as technical content known to those skilled in the art.

[0048] Please refer to Figure 1 and Figure 2 The present embodiment provides a light emitting device detection device 10, which comprises an electromagnetic signal generating unit 110, a detection unit 130, and a light emitting device grabbing unit 120.

[0049] The electromagnetic signal generating unit 110 comprises a first coil (such as a primary coil) for generating an electromagnetic signal, the light emitting device grabbing unit 120 comprises an electrode lead 121 for contacting the electrode of the light emitting device when grabbing the light emitting device, and a second coil 122 (such as a secondary coil) connected with the electrode lead 121 and forming a conductive loop, the second coil 122 is used to induce the electromagnetic signal generated by the first coil, and provide an induced current to the light emitting device based on the changing electromagnetic signal.

[0050] It should be noted that the light emitting device includes a light emitting diode (LED), an organic light emitting diode (OLED), a micro light emitting diode (Micro-LED), and the like. The light emitting device 20 includes a first electrode 201 and a second electrode 202, wherein the first electrode 201 and the second electrode 202 are located on the same side (electrode side) of the light emitting device. Exemplarily, the side where the first electrode 201 and the second electrode 202 are located can be opposite to the light emitting side of the light emitting device 20. When the first electrode 201 and the second electrode 202 of the light emitting device 20 are not on the same side of the light emitting device, please refer to Figure 2 The first electrode 201 and the second electrode 202 can be drawn to the same side of the light emitting device 20 through the conductive trace 203.

[0051] The detection unit 130 can be located on one side of the first coil, exemplarily, the detection unit 130 can be located directly below the first coil. The detection unit 130 is used to detect whether the light emitting device emits light normally under the action of the induced current, wherein the normal light emission refers to the light emission state in which the brightness of the light emission is within a set test brightness range. Specifically, the detection unit 130 can detect the light emission of the light emitting device by photoelectric detection, spectral analysis, image acquisition and analysis, and the like. It can be understood that in addition to the above-mentioned automatic detection of the light emission state of the light emitting device by the detection unit 130, the light emission of the light emitting device under the action of the induced current can also be observed by the naked eye to artificially judge the performance of the light emitting device.

[0052] Specifically, in actual use, the first coil can generate an induced magnetic field under the driving of alternating current. When the light emitting device grabbing unit 120 grabs the light emitting device close to the induced magnetic field generated by the first coil, the magnetic flux passing through the second coil 122 changes, and the second coil 122 generates an induced current. The second coil 122 provides the light emitting device with the induced current through the electrode lead 121. If the light emitting device can emit light normally under the action of the induced current, it can be judged that the light emitting device is functional and undamaged. On the contrary, if the light emitting device cannot emit light or the light emission does not meet the preset requirements (such as the brightness reaching the set brightness value) under the action of the induced current, it can be judged that the light emitting device has a fault or is damaged.

[0053] In the above structure, the light emitting device is grabbed by the light emitting device grabbing unit 120, the second coil 122 in the light emitting grabbing unit induces the change of the electromagnetic signal in the first coil to generate an induced current for driving the light emitting device, and the detection unit 130 detects whether the light emitting device emits light normally under the action of the induced current. Compared with the prior art, the physical contact points and connection lines required in the test can be reduced, the possibility of manual intervention damaging the light emitting device can be reduced, and the performance of the light emitting device can be effectively detected, thereby improving the accuracy of the detection.

[0054] Further, please refer to Figure 3 The electromagnetic signal generating unit 110 further comprises a power supply 112 and a frequency converter 113, wherein the power supply 112, the frequency converter 113 and the first coil 111 are connected in series to form a conductive loop, specifically, one pole (for example, the positive pole) of the power supply 112 is connected with the first end of the first coil 111 via the frequency converter 113, the second end of the first coil 111 is connected with the other pole (for example, the negative pole) of the power supply 112, and the power supply 112 cooperates with the frequency converter 113 to provide the first coil 111 with alternating current of a specific frequency, and the first coil 111 generates electromagnetic signals based on the alternating current of the specific frequency.

[0055] Further, please refer to Figure 4 The light emitting device grabbing unit 120 comprises a main body 123 and a conductive connecting part 124, the electrode lead-in part 121 and the second coil 122 are respectively located on the opposite sides of the main body 123, and the conductive connecting part 124 penetrates through the main body 123 and is electrically connected with the electrode lead-in part 121 and the second coil 122 respectively, for example, the conductive connecting part 124 can comprise a conductive tube penetrating through the main body 123 and a conductive wire located in the conductive tube, the conductive wire is electrically connected with the electrode lead-in part 121 and the second coil 122 respectively, and the conductive tube can protect the conductive wire from being damaged when penetrating through the main body 123. In the specific use process, the electrode lead-in part 121 can be connected with the electrode of the light emitting device to provide the light emitting device with induced current, and whether the light emitting device is damaged can be judged according to the light emitting condition of the light emitting device.

[0056] Specifically, the second coil 122 can comprise a first end and a second end, the first end can be connected with the first conductive connecting part 1241, and the second end can be connected with the second conductive connecting part 1242, in the specific use process, the first electrode lead-in part 1211 can be connected with the first electrode 201 of the light emitting device, and the second electrode lead-in part 1212 can be connected with the second electrode 202 of the light emitting device.

[0057] Further, please refer to Figure 4 The light emitting device grabbing unit 120 further comprises an adhesive part 125, the adhesive part 125 is located on the side of the main body 123 away from the second coil 122, the adhesive part 125 is located between the first electrode lead-in part 1211 and the second electrode lead-in part 1212, and the adhesive part 125 grabs the light emitting device by adhesion, wherein the material of the adhesive part 125 comprises a resin material.

[0058] Further, the detection unit 130 comprises an image acquisition subunit and an image processing subunit connected with each other.

[0059] The image acquisition subunit can be arranged in the coil of the first coil 111, and is configured to acquire a state image of the light emitting device under the action of the induced current. For example, the image acquisition subunit can comprise a CCD camera, an image sensor, etc. The image processing subunit can comprise a computer device installed with an image processing algorithm, and is configured to process the state image and determine whether the light emitting device emits light normally under the action of the induced current.

[0060] Based on the same inventive concept, the present application further provides a light emitting device detection method, which can be applied to the light emitting device detection apparatus 10 in the above embodiments. For details, please refer to Figure 5 and Figure 6 , Figure 5 a flowchart of the light emitting device detection method provided by the present application, Figure 6 a connection diagram in a specific use process, which will be described in detail below. Figure 5 and Figure 6 .

[0061] S110: grabbing a light emitting device.

[0062] In this step, the light emitting device detection apparatus 120 described above can be used to grab a light emitting device to be detected. Specifically, the light emitting device can be grabbed by the adhesive part in the light emitting device grabbing unit 120 in an adhesive manner.

[0063] The light emitting device comprises a light emitting diode (LED), an organic light emitting diode (OLED), a micro light emitting diode (Micro-LED), etc. The light emitting device comprises a light emitting side and an electrode side arranged oppositely. In this embodiment, the electrode side of the light emitting device can be adhered by the adhesive part in the light emitting device grabbing unit 120, and the electrode of the light emitting device can be contacted by the electrode lead part 121.

[0064] S120: controlling the first coil to generate an electromagnetic signal, and moving the light emitting device above the first coil, so that the second coil generates an induced current based on the electromagnetic signal generated by the first coil.

[0065] In this step, the first coil 111 is a primary coil for generating an electromagnetic signal, and the second coil 122 is a secondary coil for inducing the electromagnetic signal and generating an induced current. Specifically, the first coil 111 can be provided with a specific alternating current by controlling the power supply 112 and the frequency converter 113. The first coil 111 generates an induced magnetic field under the action of the alternating current. The light emitting device is moved above the first coil 111. In the process of moving the second coil 122 close to the first coil 111, the magnetic flux passing through the second coil 122 changes, and the second coil 122 generates an induced current. The second coil 122 provides the light emitting device with an induced current through the electrode lead part 121.

[0066] S140: detecting whether the light emitting device normally emits light under the action of the induced current.

[0067] In this step, the detection unit 130 can be used to detect whether the light emitting device normally emits light under the action of the induced current. Normal light emission refers to a light emission state in which the brightness of light emission is within a set test brightness range. Specifically, the detection unit 130 can detect the light emission of the light emitting device by photoelectric detection, spectral analysis, image acquisition and analysis, etc. It can be understood that in addition to the above-mentioned automatic detection of the light emission state of the light emitting device by the detection unit 130, the light emission of the light emitting device under the action of the induced current can also be observed by the naked eye to artificially judge the performance of the light emitting device. Specifically, if the light emitting device can normally emit light under the action of the induced current, it can be judged that the light emitting device is functional and not damaged. On the contrary, if the light emitting device cannot emit light or the light emission does not meet the preset requirements (such as the brightness reaching a set brightness value) under the action of the induced current, it can be judged that the light emitting device has a fault or is damaged.

[0068] In this embodiment, the light emitting device is grabbed by the light emitting device grabbing unit 120 and moved into the detection range of the detection unit. At this time, the second coil 122 in the light emitting grabbing unit induces the change of the electromagnetic signal in the first coil 111 to generate an induced current for driving the light emitting device. The detection unit 130 detects whether the light emitting device normally emits light under the action of the induced current. Compared with the prior art, not only can the physical contact points and connection lines required in the test be reduced, and the possibility of manual intervention damaging the light emitting device can be reduced, but also the performance of the light emitting device can be effectively detected, and the detection accuracy can be improved.

[0069] Further, in step S130, the state image of the light emitting device under the action of the induced current can be obtained by an image acquisition subunit, and the state image can be processed by an image processing subunit to determine whether the light emitting device normally emits light under the action of the induced current. Illustratively, the image acquisition subunit can include a CCD camera, an image sensor, etc., and the image processing subunit can include a computing device installed with an image processing algorithm.

[0070] Further, after step S130, the method for detecting the light emitting device provided by the embodiment of the present application can further include the following method.

[0071] When the light emitting brightness of the light emitting device reaches the target condition, the light emitting device can be determined as a normal light emitting device. When the display screen needs to be repaired, the normal light emitting device can be transferred to the position of the missing light emitting device in the target area to repair the missing position, thereby ensuring the repair yield. When the light emitting brightness of the light emitting device does not reach the target condition, the light emitting device can be determined as a damaged light emitting device, and the damaged light emitting device can be transferred to the recycling area. For example, the defective light emitting device can be removed from the bonding part by using the bonding adhesive surface with a larger viscosity than the bonding part, and the defective light emitting device can be transferred to the recycling area or reserved on the bonding adhesive surface for repair and recycling.

[0072] In summary, the embodiment of the present application provides a light emitting device detection device and method. The light emitting device grabbing unit grabs the light emitting device. The second coil in the light emitting grabbing unit induces the change of the electromagnetic signal in the first coil to generate an induced current for driving the light emitting device. The detection unit detects whether the light emitting device normally emits light under the action of the induced current. Compared with the prior art, the physical contact points and connection lines required in the test can be reduced, the possibility of damage to the light emitting device caused by manual intervention can be reduced, and the performance of the light emitting device can be effectively detected, thereby improving the accuracy of the detection.

[0073] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A light-emitting device detection device, characterized in that, It includes an electromagnetic signal generation unit, a detection unit, and a light-emitting device grasping unit; The electromagnetic signal generating unit includes a first coil for generating electromagnetic signals; The light-emitting device grasping unit includes an electrode conductive part that contacts the electrode of the light-emitting device when grasping the light-emitting device, and a second coil connected to the electrode conductive part to form a conductive circuit. The second coil is used to sense the electromagnetic signal generated by the first coil and generate an induced current based on the changing electromagnetic signal to provide to the light-emitting device. The detection unit is used to detect whether the light-emitting device emits light normally under the action of the induced current.

2. The light-emitting device detection device according to claim 1, characterized in that, The electromagnetic signal generating unit also includes a power supply and a frequency converter; The power supply, the frequency converter, and the first coil are connected in series to form a conductive circuit. The first coil generates an electromagnetic signal based on the AC power provided by the power supply and the frequency converter.

3. The light-emitting device detection device according to claim 1, characterized in that, The light-emitting device grasping unit includes a main body and a conductive connection part; The electrode conductive portion and the second coil are located on opposite sides of the main body, and the conductive connection portion passes through the main body and is electrically connected to the electrode conductive portion and the second coil, respectively.

4. The light-emitting device detection device according to claim 3, characterized in that, The conductive connection portion includes a first conductive connection portion and a second conductive connection portion, and the electrode conductive portion includes a first electrode conductive portion and a second electrode conductive portion; The two ends of the first conductive connection are respectively connected to the first electrode conductive part and the second coil, and the two ends of the second conductive connection are respectively connected to the second electrode conductive part and the second coil.

5. The light-emitting device detection device according to claim 4, characterized in that, The light-emitting device gripping unit also includes an adhesive part; The adhesive portion is located on the side of the main body away from the second coil. The adhesive portion is located between the first electrode conductive portion and the second electrode conductive portion. The adhesive portion grips the light-emitting device by adhesive bonding.

6. The light-emitting device detection device according to claim 3, characterized in that, The detection unit includes an image acquisition subunit and an image processing subunit that are interconnected. The image acquisition subunit is located on one side of the first coil, and the image acquisition subunit is used to acquire the state image of the light-emitting device under the action of the induced current; The image processing subunit is used to process the status image and determine whether the light-emitting device emits light normally under the action of the induced current.

7. A method for detecting a light-emitting device, characterized in that, The method, applied to the light-emitting device detection apparatus according to any one of claims 1-6, comprises: Grab a light-emitting device; The first coil is controlled to generate an electromagnetic signal, and the light-emitting device is moved above the first coil, so that the second coil generates an induced current based on the electromagnetic signal generated by the first coil; The detection is performed to determine whether the light-emitting device emits light normally under the influence of the induced current.

8. The light-emitting device detection method according to claim 7, characterized in that, The step of grasping a light-emitting device includes: The light-emitting device is grasped by adhesive part in the light-emitting device grasping unit in an adhesive manner.

9. The light-emitting device detection method according to claim 7, characterized in that, The step of detecting whether the light-emitting device emits light normally under the action of the induced current includes: The detection unit acquires a state image of the light-emitting device under the action of the induced current, and processes the state image to determine whether the light-emitting device emits light normally under the action of the induced current.

10. The light-emitting device detection method according to claim 7, characterized in that, The step of detecting whether the light-emitting device emits light normally under the action of the induced current includes: When the light-emitting brightness of the light-emitting device is detected to meet the target condition, the light-emitting device is determined to be a normal light-emitting device; If the light-emitting brightness of the light-emitting device does not meet the target condition, the light-emitting device is determined to be a damaged light-emitting device.

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