LED chip transfer method

Abstract

The present application relates to the technical field of LED chip, specifically relates to a kind of LED core particle transfer method, comprising the following steps: S2: magnetic film is attached on the surface of red light core particle, thickness 0.1-20mm;Magnetic film is attached on the surface of green light core particle, thickness 20-40mm;Magnetic film is attached on the surface of blue light core particle, thickness 40-60mm;S3: magnetic field group is moved, and red light core particle is simultaneously adsorbed, magnetic field group is moved to above substrate, so that red light core particle falls on the surface of substrate;S4: green light core particle falls on the surface of substrate;S5: basket light core particle falls on the surface of substrate;The beneficial effects of the present application are that: the LED core particle transfer method provided by the present application is suitable for the transfer and combination of three primary color core particles, can accurately transfer core particle, and improves the production and processing efficiency of LED.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED chip, and particularly relates to an LED chip transfer method. BACKGROUND

[0002] At present, gallium nitride-based LED is paid more and more attention and research, and the epitaxial structure mainly comprises a substrate (mainly sapphire substrate), a buffer layer, an undoped GaN layer, an N-type doped layer, a reflection layer, an MQW active region, an electron blocking layer and a P-type layer which are stacked in sequence. With the continuous improvement of the requirement for display technology, the size of the light-emitting diode chip is also continuously reduced, and the display effect of the reduced light-emitting diode chip is more excellent, and the color gamut range is wider.

[0003] In order to make the LED emit color light, the combination of three-primary-color chips (the three-primary-color chips include red light chips, green light chips and blue light chips) needs to be carried out on one LED, but since the size of the chip is small, more fine control and high-precision movement are needed; the conventional contact type transfer chip is easy to contaminate the chip. In order to avoid the contamination of the chip, the Chinese patent with the publication number CN111508888 A discloses an LED row transfer device and an LED row transfer method.

[0004] But the scheme of the above patent cannot accurately control the transfer of the chip, and in the transfer process of the combination of the three-primary-color chips, the transferred chips are easily interfered and moved, for example, the red light chip has been transferred to the specified position, and then the green light chip is moved above the red light chip, because of the influence of the magnetic field, the red light chip is easily moved to the wrong position. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an LED chip transfer method, so that the three-primary-color chips of the LED can be accurately transferred.

[0006] In order to solve the above technical problem, one technical scheme adopted by the present application is as follows: an LED chip transfer method, comprising the following steps:

[0007] S1: setting a magnetic field group;

[0008] S2: attaching a magnetic film on the surface of the red light chip, the thickness being 0.1-20mm; attaching a magnetic film on the surface of the green light chip, the thickness being 20-40mm; and attaching a magnetic film on the surface of the blue light chip, the thickness being 40-60mm;

[0009] S3: moving the magnetic field group to adsorb the red light chip, moving the magnetic field group above the substrate, weakening the magnetic field generated by the magnetic field group, and making the red light chip fall on the surface of the substrate;

[0010] S4: using the magnetic field group of S3 to weaken the magnetic field to adsorb the green light core particles, moving the magnetic field group above the substrate, weakening the magnetic field generated by the magnetic field group, and making the green light core particles fall on the surface of the substrate;

[0011] S5: using the magnetic field group of S4 to weaken the magnetic field to adsorb the green light core particles, moving the magnetic field group above the substrate, weakening the magnetic field generated by the magnetic field group, and making the green light core particles fall on the surface of the substrate;

[0012] S6: completing the transfer of the three primary color core particles of the LED.

[0013] The beneficial effects of the present application are that in the LED core particle transfer method provided by the present application, the magnetic field group is used to generate a magnetic field for adsorbing core particles.

[0014] The magnetic thin films of different thicknesses are attached on the red light core particles, green light core particles and blue light core particles, so that the red light core particles, green light core particles and blue light core particles are subjected to different magnetic field forces under the same magnetic field.

[0015] Specifically, the magnetic field strength sufficient to adsorb the red light core particles is greater than the magnetic field strength sufficient to adsorb the green light core particles, which is greater than the magnetic field strength sufficient to adsorb the blue light core particles.

[0016] When the green light core particles are moved, the magnetic field generated by the magnetic field group is reduced, and the magnetic field group can avoid moving the red light core particles that have been placed on the substrate as much as possible when passing above the red light core particles; similarly, the magnetic field group can avoid affecting the placement position of the green light core particles when moving the blue light core particles.

[0017] Therefore, the LED core particle transfer method provided by the present application is suitable for the transfer and combination of three primary color core particles, can accurately transfer the core particles, and improves the production and processing efficiency of the LED. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of forming an LED for an LED core particle transfer method of the present application;

[0019] Label explanation:

[0020] 1, red light core particle; 2, green light core particle; 3, blue light core particle; 4, substrate. DETAILED DESCRIPTION

[0021] In order to explain the technical content, purposes and effects of the present application in detail, the following will be explained in combination with the embodiments and the drawings.

[0022] An LED core particle transfer method, comprising the following steps:

[0023] S1: setting a magnetic field group;

[0024] S2: Attaching magnetic film on the surface of red light core particle 1, thickness 0.1-20mm; attaching magnetic film on the surface of green light core particle 2, thickness 20-40mm; attaching magnetic film on the surface of blue light core particle 3, thickness 40-60mm;

[0025] S3: Moving the magnetic field group, meanwhile, adsorbing the red light core particle 1, moving the magnetic field group above the substrate 4, weakening the magnetic field generated by the magnetic field group, and making the red light core particle 1 fall on the surface of the substrate 4;

[0026] S4: Using the magnetic field group with weakened magnetic field in S3, adsorbing the green light core particle 2, moving the magnetic field group above the substrate 4, weakening the magnetic field generated by the magnetic field group, and making the green light core particle 2 fall on the surface of the substrate 4;

[0027] S5: Using the magnetic field group with weakened magnetic field in S4, adsorbing the blue light core particle, moving the magnetic field group above the substrate 4, weakening the magnetic field generated by the magnetic field group, and making the blue light core particle fall on the surface of the substrate 4;

[0028] S6: Completing the transfer of the three primary color core particles of the LED.

[0029] It can be known from the above description that the beneficial effects of the present application are that, in the LED core particle transfer method provided by the present application, the magnetic field group is used to generate the magnetic field for adsorbing the core particles.

[0030] The magnetic films with different thicknesses are attached on the red light core particle 1, the green light core particle 2 and the blue light core particle 3, so that the red light core particle 1, the green light core particle 2 and the blue light core particle 3 receive different magnetic field forces in the same magnetic field.

[0031] Specifically, the magnetic field strength sufficient to adsorb the red light core particle 1 is greater than the magnetic field strength sufficient to adsorb the green light core particle 2, which is greater than the magnetic field strength sufficient to adsorb the blue light core particle.

[0032] When the green light core particle 2 is moved, the magnetic field generated by the magnetic field group is reduced, and the magnetic field group can avoid moving the red light core particle 1 that has been placed on the substrate 4 as much as possible when passing above the red light core particle 1; similarly, the magnetic field group can avoid affecting the placement position of the green light core particle 2 when moving the blue light core particle 3.

[0033] Therefore, the LED core particle transfer method provided by the present application is suitable for the transfer and combination of the three primary color core particles, can accurately transfer the core particles, and improves the production and processing efficiency of the LED.

[0034] Further, S5.5 between S5 and S6 is further included;

[0035] S5.5: Placing the magnetic field plate horizontally above the to-be-transferred, enhancing the magnetic field generated by the magnetic field plate, adsorbing all the core particles, observing abnormal core particles, and replacing the abnormal core particles with normal core particles.

[0036] From the above description, all the core particles will be arrayed on the substrate, and the magnetic field plate is placed above the plurality of core particles to enhance the generated magnetic field, which can avoid the horizontal movement of the core particles.

[0037] Simplifying the magnetic field force formula of the magnetic pole, the conclusion that the magnetic field strength generated by the magnetic field plate (the magnetic force suffered by the core particle) is inversely proportional to the third power of the distance from the magnetic field plate to the core particle can be obtained.

[0038] When the magnetic force suffered by the core particle is balanced with the gravity of the core particle, the core particle will be suspended at a certain height. For example, the red light core particles will be suspended at the same height. If the staff finds that a red light core particle is not on the same horizontal plane as other red light core particles, it means that the red light core particle is removed from the magnetic field, and then a normal red light core particle is used to replace it.

[0039] Further, S5.2 between S5 and S5.5 is further included;

[0040] S5.2: Arraying the plurality of magnetic field generators on the same horizontal plane to form a magnetic field plate.

[0041] From the above description, a method for forming a magnetic field plate is provided, and the plurality of magnetic field generators are arranged at intervals to form the magnetic field plate, which can avoid the magnetic force suffered by the core particles at the edge being different from that suffered by the core particles in the middle.

[0042] Further, the S1 is specifically: uniformly arranging the plurality of magnetic field generators along the same straight line on the same horizontal plane to form a magnetic field group;

[0043] In the S3, S4, and S5, when the magnetic field group is above the substrate 4, the magnetic field group is moved along the width direction thereof;

[0044] Further, the step S5.1 between S5 and S6 is further included;

[0045] S5.1: Circulating the S3, S4, and S5 for several times.

[0046] Reference Figure 1 From the above description, the conventional method for transferring core particles using a magnetic field usually directly transfers the entire array of core particles, such as directly transferring the entire array of red light core particles 1, and then transferring the green light core particles 2. In this way, more magnetic field generators will pass above the red light core particles 1 at the side edge, and fewer magnetic field generators will pass above the red light core particles 1 in the middle. This can easily cause the problem that the horizontal movement distances of the core particles in the middle and at the edge are different, which affects the precision of the core particle transfer.

[0047] The LED core particle transfer method of the present application transfers multiple rows of red light core particles 1 at a time, then transfers multiple rows of green light core particles 2 and blue light core particles 3, which makes the upper part of the same row of red light core particles 1 close to the magnetic field group only twice, makes the horizontal moving distance of multiple red light core particles 1 as same as possible, and makes the horizontal moving distance of multiple green light core particles 2 as same as possible.

[0048] Further, the magnetic field generator is an electromagnet, and the "weakening the magnetic field generated by the magnetic field group" in S3, S4 and S5 specifically refers to reducing the current flowing into the electromagnet.

[0049] As described above, a method for weakening the strength of the magnetic field generated by the magnetic field group is provided.

[0050] Further, the magnetic field generator is a permanent magnet.

[0051] S1 specifically refers to uniformly arranging multiple magnetic field generators along the same straight line on the same horizontal plane, and horizontally arranging a strip-shaped magnetic shield plate above the multiple magnetic field generators to form a magnetic field group.

[0052] The "weakening the magnetic field generated by the magnetic field group" in S3, S4 and S5 specifically refers to the magnetic shield plate close to the multiple magnetic field generators.

[0053] As described above, a method for weakening the strength of the magnetic field generated by the magnetic field group is provided. The magnetic shield plate close to the magnetic field group blocks more magnetic field lines, so that the magnetic force acting on the core particle is weakened.

[0054] Further, S1 specifically refers to uniformly arranging multiple magnetic field generators along the same straight line on the same horizontal plane, and horizontally arranging a strip-shaped magnetic shield plate above the multiple magnetic field generators, and uniformly opening multiple vertical through holes on the magnetic shield plate to form a magnetic field group.

[0055] As described above, in the array of core particles, the above method avoids that the core particles at the edge receive different magnetic forces from the magnetic force at the edge.

[0056] Further, S1 further includes: arranging multiple magnetic field generators on a rack, using a lead screw to penetrate and threadedly connect the magnetic shield plate, and using a motor to drive the lead screw arranged on the rack; and the "magnetic shield plate close to the multiple magnetic field generators" specifically refers to using the motor to drive the lead screw to make the magnetic shield plate close to the multiple magnetic field generators.

[0057] As described above, the above arrangement provides a method for moving the magnetic shield plate.

[0058] Embodiment one

[0059] An LED core particle transfer method, comprising the following steps:

[0060] S1: a plurality of magnetic field generators are uniformly arranged along the same straight line on the same horizontal plane to form a magnetic field group; the magnetic field generator is an electromagnet.

[0061] S2: a magnetic film with a thickness of 15mm is attached to the surface of the red light core particle; a magnetic film with a thickness of 35mm is attached to the surface of the green light core particle; and a magnetic film with a thickness of 55mm is attached to the surface of the blue light core particle;

[0062] S3: the red light core particle array is placed on the transfer platform, the magnetic field group is moved, and the red light core particle is adsorbed; the magnetic field group is moved above the substrate, the current flowing into the electromagnet is reduced, and the red light core particle falls on the surface of the substrate;

[0063] S4: the green light core particle array is placed on the transfer platform, the magnetic field group with weakened magnetic field is used to adsorb the green light core particle, and the magnetic field group is moved above the substrate; the current flowing into the electromagnet is reduced, and the green light core particle falls on the surface of the substrate;

[0064] S5: the blue light core particle array is placed on the transfer platform, the magnetic field group with weakened magnetic field is used to adsorb the blue light core particle, and the magnetic field group is moved above the substrate; the current flowing into the electromagnet is reduced, and the blue light core particle falls on the surface of the substrate;

[0065] S6: S3, S4 and S5 are cycled 6 times to obtain a combination of a plurality of aligned three-primary-color core particles, and the transfer of the three-primary-color core particles of the LED is completed.

[0066] Example two

[0067] S1: a plurality of magnetic field generators are uniformly arranged along the same straight line on the same horizontal plane, and a strip-shaped magnetic shield plate is horizontally arranged above the plurality of magnetic field generators; a plurality of vertical through holes are uniformly arranged on the magnetic shield plate to form a magnetic field group;

[0068] A plurality of magnetic field generators are arranged on a rack, a lead screw is threaded through and connected with the magnetic shield plate, the lead screw is arranged on the rack to rotate, and a motor is connected with the lead screw for transmission; the magnetic field generator is a permanent magnet;

[0069] S2: a magnetic film with a thickness of 0.1-20mm is attached to the surface of the red light core particle; a magnetic film with a thickness of 20-40mm is attached to the surface of the green light core particle; and a magnetic film with a thickness of 40-60mm is attached to the surface of the blue light core particle;

[0070] S3: the red light core particle array is placed on the transfer platform, the magnetic field group is moved, and a plurality of red light core particles are adsorbed; the magnetic field group is moved above the substrate, the magnetic shield plate is moved close to the plurality of magnetic field generators by using the motor to drive the lead screw, the magnetic field of the magnetic field group is weakened, and the red light core particle falls on the surface of the substrate;

[0071] S4: the green light core particle array is on the platform to be transferred, a magnetic field group with weakened magnetic field in S3 is used to adsorb the multiple green light core particles, the magnetic field group is moved above the substrate, the magnetic shield plate is moved close to the multiple magnetic field generators by using the motor driven screw rod, the magnetic field generated by the weakened magnetic field group is weakened, and the green light core particles fall on the surface of the substrate;

[0072] S5: the basket light core particle array is on the platform to be transferred, a magnetic field group with weakened magnetic field in S4 is used to adsorb the multiple basket light core particles, the magnetic field group is moved above the substrate, the magnetic shield plate is moved close to the multiple magnetic field generators by using the motor driven screw rod, the magnetic field generated by the weakened magnetic field group is weakened, and the basket light core particles fall on the surface of the substrate;

[0073] S6: S3, S4 and S5 are cycled for several times.

[0074] S7: the multiple magnetic field generators are arrayed on the same horizontal plane to form a magnetic field plate; the magnetic field plate is horizontally placed above the platform to be transferred, the magnetic field generated by the magnetic field plate is enhanced to adsorb all the core particles, the abnormal core particles are observed, and the normal core particles are used to replace the abnormal core particles.

[0075] S8: the transfer of the three primary color core particles of the LED is completed.

[0076] The above only describes the embodiments of the present application, and does not limit the patent range of the present application, and any equivalent transformation or direct or indirect application in the related technical field by using the content of the specification and drawings of the present application is also included in the patent protection range of the present application.

Claims

1. A LED chip transfer method, characterized by, It comprises the following steps: S1: setting up a magnetic field group; S2: attaching a magnetic film with a thickness of 0.1-20mm on the surface of the red light core particle; attaching a magnetic film with a thickness of 20-40mm on the surface of the green light core particle; and attaching a magnetic film with a thickness of 40-60mm on the surface of the blue light core particle; S3: moving the magnetic field group to adsorb the red light core particle, moving the magnetic field group above the substrate, weakening the magnetic field generated by the magnetic field group, and making the red light core particle fall on the surface of the substrate; S4: using the magnetic field group with weakened magnetic field in S3 to adsorb the green light core particle, moving the magnetic field group above the substrate, weakening the magnetic field generated by the magnetic field group, and making the green light core particle fall on the surface of the substrate; S5: using the magnetic field group with weakened magnetic field in S4 to adsorb the blue light core particle, moving the magnetic field group above the substrate, weakening the magnetic field generated by the magnetic field group, and making the blue light core particle fall on the surface of the substrate; S6: completing the transfer of the three primary color core particles of the LED; It further comprises S5.5 between S5 and S6; S5.5: horizontally placing a magnetic field plate above the to-be-transferred, strengthening the magnetic field generated by the magnetic field plate, adsorbing all the core particles, observing abnormal core particles, and replacing the abnormal core particles with normal core particles.

2. The LED chip transfer method according to claim 1, wherein It further comprises S5.2 between S5 and S5.5; S5.2: arranging multiple magnetic field generators in an array to form a magnetic field plate on the same horizontal plane.

3. The LED chip transfer method according to claim 1, wherein Said S1 is specifically: uniformly arranging multiple magnetic field generators along the same straight line on the same horizontal plane to form a magnetic field group; In S3, S4 and S5, when the magnetic field group is above the substrate, the magnetic field group moves along the width direction thereof; It further comprises a step S5.1 between S5 and S6; S5.1: repeating S3, S4 and S5 for several times.

4. The LED chip transfer method according to claim 3, wherein Said magnetic field generator is an electromagnet, and "weakening the magnetic field generated by the magnetic field group” in S3, S4 and S5 is specifically: reducing the amount of current flowing into the electromagnet.

5. The LED chip transfer method according to claim 3, wherein Said magnetic field generator is a permanent magnet; Said S1 is specifically: uniformly arranging multiple magnetic field generators along the same straight line on the same horizontal plane, and horizontally arranging a strip-shaped magnetic shielding plate above the multiple magnetic field generators to form a magnetic field group; Said "weakening the magnetic field generated by the magnetic field group” in S3, S4 and S5 is specifically: the magnetic shielding plate is close to the multiple magnetic field generators.

6. The LED chip transfer method according to claim 5, wherein Said S1 is specifically: uniformly arranging multiple magnetic field generators along the same straight line on the same horizontal plane, horizontally arranging a strip-shaped magnetic shielding plate above the multiple magnetic field generators, and uniformly arranging multiple vertical through holes on the magnetic shielding plate to form a magnetic field group.

7. The LED chip transfer method according to claim 5, wherein Said S1 further comprises: arranging multiple magnetic field generators on a rack, using a screw rod to penetrate and threadedly connect the magnetic shielding plate, and using a motor to drive the screw rod arranged on the rack; and said "the magnetic shielding plate is close to the multiple magnetic field generators” is specifically: using the motor to drive the screw rod to make the magnetic shielding plate close to the multiple magnetic field generators.

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