Transfer printing template and transfer printing device of micro light-emitting diode

Abstract

This disclosure provides a transfer printing template, including a transfer substrate, one surface of the substrate has a array of bulges, the bulge surface and gap between the bulges are covered with a colloid varying its viscosity with temperature change. This disclosure also provides a transfer printing device of LED, including a rack, the rack is provided with a standby platform and a transfer platform. A transfer mechanism is provided above the rack, can move between the two platforms and be vertically movable, the template is arranged on the mechanism, the bulges are disposed opposite to the two platforms. A device for heating the template is arranged on the mechanism, the template is fixed on the device by fasteners; a cooling device is provided in the transfer platform. Compared with the prior art, the transfer of LED by adjusting temperature can be achieved, is a simple structure and high efficiency.

Claims

1. A transfer printing device of micro light-emitting diode (LED), comprising: a rack, the rack is provided with a standby platform and a transfer platform adjacent to the standby platform, a transfer mechanism is provided above the rack, can move from the standby platform to the transfer platform and be vertically movable, a transfer printing template is arranged on the transfer mechanism, the transfer template comprises a transfer substrate, there is an uniform array of bulges on one side surface of the transfer substrate, surface of the bulges and gap between the bulges are covered with colloid varying its viscosity with temperature change, the bulges are disposed oppositely to the standby platform and the transfer platform, a heating device for heating the transfer printing template is arranged on the transfer mechanism, a heating surface of the heating device faces downward, the transfer printing template is fixed on the heating surface of the heating device by fasteners, a cooling device for cooling the transfer printing template is provided in the transfer platform the cooling surface is opposite to the heating surface, a power supply is arranged on the rack, the power is supplied respectively to the heating device, the cooling device and the transfer mechanism.

2. The transfer printing device of LED according to claim 1, wherein the shape of the bulges is rectangular.

3. The transfer printing device of LED according to claim 1, wherein the gap distance between the bulges is equal.

4. The transfer printing device of LED according to claim 1, wherein the transfer mechanism comprises a guide rail provided on the rack and located above the standby platform and the transfer platform, a first transmission mechanism for driving the heating device and the horizontal movement of the transfer printing template and a second transmission mechanism for driving the heating device and the vertical movement of the transfer printing template, the second transmission mechanism is fixed connection with a slide of the guide rail.

5. The transfer printing device of LED according to claim 2, wherein the transfer mechanism comprises a guide rail provided on the rack and located above the standby platform and the transfer platform, a first transmission mechanism for driving the heating device and the horizontal movement of the transfer printing template and a second transmission mechanism for driving the heating device and the vertical movement of the transfer printing template, the second transmission mechanism is fixed connection with a slide of the guide rail.

6. The transfer printing device of LED according to claim 3, wherein the transfer mechanism comprises a guide rail provided on the rack and located above the standby platform and the transfer platform, a first transmission mechanism for driving the heating device and the horizontal movement of the transfer printing template and a second transmission mechanism for driving the heating device and the vertical movement of the transfer printing template, the second transmission mechanism is fixed connection with a slide of the guide rail.

7. The transfer printing device of LED according to claim 4, wherein the first transmission mechanism comprises wheels provided at both ends of the guide rail, the wheel axis is perpendicular to the guide rail, one of the wheels is provided with a drive motor, the two wheels are provided with a belt, and the second transmission mechanism is connected to the belt by a fixed block.

8. The transfer printing device of LED according to claim 5, wherein the first transmission mechanism comprises wheels provided at both ends of the guide rail, the wheel axis is perpendicular to the guide rail, one of the wheels is provided with a drive motor, the two wheels are provided with a belt, and the second transmission mechanism is connected to the belt by a fixed block.

9. The transfer printing device of LED according to claim 6, wherein the first transmission mechanism comprises wheels provided at both ends of the guide rail, the wheel axis is perpendicular to the guide rail, one of the wheels is provided with a drive motor, the two wheels are provided with a belt, and the second transmission mechanism is connected to the belt by a fixed block.

10. The transfer printing device of LED according to claim 7, wherein the second transfer mechanism is a cylinder, the axis of the piston rod of the cylinder is perpendicular to the guide rail, and the heating device is provided at the lower end of the piston rod of the cylinder.

11. The transfer printing device of LED according to claim 8, wherein the second transfer mechanism is a cylinder, the axis of the piston rod of the cylinder is perpendicular to the guide rail, and the heating device is provided at the lower end of the piston rod of the cylinder.

12. The transfer printing device of the LED according to claim 9, wherein the second transfer mechanism is a cylinder, the axis of the piston rod of the cylinder is perpendicular to the guide rail, and the heating device is provided at the lower end of the piston rod of the cylinder.

Description

BRIEF DESCRIPTION

(1) FIG. 1 is a schematic view of the transfer printing template of this disclosure.

(2) FIG. 2 is a schematic view of the internal structure of the transfer printing template of this disclosure.

(3) FIG. 3 is a schematic view of the transfer printing template of LED of this disclosure.

(4) FIG. 4 is a schematic view of the heating device of this disclosure.

(5) FIG. 5 is a schematic view of the cooling device of this disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

(6) This disclosure is described in detail below in conjunction with the accompanying drawings and the embodiments.

(7) As shown in FIG. 1 and FIG. 2, the transfer printing template 14 of this disclosure includes a plate-shaped transfer substrate 1, there is a uniform array of bulges 2 on one surface side of the transfer substrate, the surface of the bulges 2 and the gap between the bulges 2 are covered with temperature-control colloid 3 varying its viscosity with temperature change. The temperature-controlled colloid 3 is temperature-control one which can be peeled at low temperature, and the colloid loses its viscosity and can be peeled off at a temperature between 20-60 C.

(8) In particular, the shape of the bulges 2 is rectangular with surface size is adapted to the size of the LED of the supply substrate 11; the gap distance between the bulges 2 is equal; particularly, the gap distance between the bulges 2 is equal to the gap distance between two LEDs on the supply substrate 11, to achieve adsorption.

(9) The transfer substrate of this disclosure is made of a flexible material, such as PDMS (polydimethylsiloxane), PI (Polyimide) or PET (Polyethylene terephthalate).

(10) As shown in FIG. 3, this disclosure also discloses a LED transfer printing device includes a rack 4, provided with a standby platform 5 and a transfer platform 6 adjacent to standby platform 5; standby platform 5 is used for loading the supply substrate 11, and the transfer platform 6 is used for loading a receiving substrate 12; Above the rack is provided with the transmission mechanism 7, which can be move horizontally from the standby platform 5 to the transfer platform 6; the transmission mechanism 7 is provided with the transfer printing template 14; the transfer printing template 14 includes a plate-shaped transfer substrate (as shown in FIGS. 1 and 2); there is a uniform array of bulges 2 on one surface side of the transfer substrate, the bulges 2 is opposite to surface of the standby platform 5 and the transfer platform 6; surface of the bulges 2 and the gap between bulges 2 are covered with temperature-control colloid 3 varying its viscosity with temperature change; the temperature-controlled colloid 3 is temperature-control one which can be peeled at low temperature, and the colloid losses its viscosity and can be peeled off at temperature between 20-60 C.

(11) The rack 7 is provided with heating device for heating the transfer printing template 14, the heating surface of the heating device 9 faces downward; the transfer printing template 14 is fixed on the heating surface of the heating device 9 by fasteners; the transfer platform 6 is provided with the cooling device for cooling the transfer printing template 14, the cooling surface of transfer platform 6 is opposite to the heating surface; the power supply 8 is arranged on the rack 4, which is supplied respectively to the heating device 9, the cooling device 10 and transfer mechanism 7.

(12) The transfer printing template 14 of this disclosure is fixed with the heating device 9 by bolts or cards (not shown).

(13) In the LED transfer printing device of this disclosure, the shape of the bulges 2 is rectangular with surface size is adapted with the size of the LED of the supply substrate 11; the gap distance between the bulges 2 is equal; particularly, the gap distance between the bulges 2 is equal to the gap distance between two LEDs on the substrate 11, to achieve adsorption.

(14) As shown in FIG. 3, the transfer mechanism 7 includes a guide rail 15 provided on the rack 4 and located above the standby platform 5 and the transfer platform 6, the first transmission mechanism for driving the heating device 9 and the horizontal movement of the transfer printing template 14 and the second transmission mechanism for driving the heating device 9 and the vertical movement of the transfer printing template 14, the second transmission mechanism is fixed connection with a slide of the guide rail 15.

(15) In this disclosure, the first transmission mechanism and the second transmission mechanism can achieve the horizontal and vertical movement via the prior art such as the transmission of transmission belts, gear rack, and screw rotation.

(16) As shown in FIG. 3, as an example of the first transmission mechanism, the first transmission mechanism includes the wheels 16 provided at both ends of the guide rail, and the axis of the wheels 16 is vertical to the guide rail, one of the wheels 16 is provided with drive motor 17, there are sets of bets on the wheels 16; the second transmission mechanism is connected with the belt 18 by fixed block; the two wheels 16 are fixed on the rack 4 by two L-shaped mounting bracket; the drive motor 17 is connected to the power supply 8.

(17) As shown in FIG. 3, as an example of the second transmission mechanism, the second transmission mechanism of this disclosure is the cylinder 19, the shaft axis of the cylinder 19 is vertical to the guide rail 15, the block of the cylinder 19 is fixed connection with the slide of the guide rail 15 and transmission belt 18, the connection of the cylinder 19 and the transmission belt 18 in particular is connected to the upper side or lower side of the belt 18; the heating device 9 is disposed at the lower end of the piston rod of the cylinder 19.

(18) Working principle of this disclosure is as follows: by the first transmission mechanism, the heating device 9 and transfer printing template 14 are moved horizontally above the standby platform 5, the heating device 9 is turned on to heat the transfer printing template 14, so that the viscosity of the tempture-control collide 3 becomes larger; the heating device 9 and the transfer printing template 14 are driven by the second transmission mechanism drives to move downward; after the transfer printing template 14 attaches the LED from the supply substrate 11, the heating device 9 and the transfer printing template 14 are driven by the second transmission mechanism to move upward, and are moved above the transfer platform 6 by the first transmission mechanism; the heating device 9 and the transfer printing template 14 are driven by the second transmission mechanism to move downward; at this moment, the cooling device 10 is turned on and the heating device is turned off. When the transfer printing template 14 is moved downward to the top of the receiving substrate 12, the viscosity of the temperature-controlled colloid was reduced due to the reduction of temperature, so that the LED 13 can be peeled from the transfer printing template 14, to complete the transfer of LED 13.

(19) According to this principle, the heating device 9 and the cooling device 10 of this disclosure may be reversed according to temperature properties of the temperature-controlled colloid 3, that is, if the temperature-controlled colloid 3 is heating peeled colloid, the peeling can be processed at 30-50 C.; at this time, the setting positions of the heating device 9 and the cooling device 10 are opposite, that is, the cooling device 10 is provided on the transmission mechanism 7, and the heating device 9 is provided on the transfer platform 6.

(20) The heating device of this disclosure may be employed in heating platforms of the prior art, such as the thermostatic heating platform; or the following manner can be used to achieve as shown in FIG. 4, includes a metal plate 20 having a heating surface, the metal plate 20 is provided with a PTC heating film 21; the PTC heating film 21 is powered by the power supply 8, then heat is generated from the PTC heating film 21 and conducted to the transfer printing template through the metal plate 20, so that the temperature-controlled colloid 3 is melted to attach the LED 13.

(21) The cooling device for this disclosure can be employed by the ones as shown in FIG. 5, includes a metal container 22, which can be loaded with a cooling medium; the section of the metal container 22 is rectangular, the metal container 22 constitutes the transfer platform 6, the cooling surface in the opposite side of the heating device is formed; the metal container 22 is loaded with a cooling medium, the cavity of the metal container 22 is connected to a storage tank 24 filled with a cooling medium through the first solenoid valve 23, the metal container 22 also has a exhaust port 25, the exhaust port 25 is provided with the second solenoid valve 27. When the transfer printing template adhered to LED arrives to the top of the receiving substrate 12 on the cooling surface of the transfer platform 6, the receiving substrate 12 is cooled by cooling surface, the cooling temperature was conducted to the temperature-controlled colloid 3 through LED, the viscosity of the temperature-controlled colloid 3 is reduced, so that the LED 13 is peeled from transfer printing template to achieve transfer printing; the first solenoid valve 23 and the second solenoid valve 27 are all connected to the power supply 8.

(22) In this disclosure, the cooling medium is liquid nitrogen or dry ice.

(23) This disclosure can also be provided with a PLC (programmable logic) for controlling the operation of parts such as the heating device 9, the cooling device 10, and the transfer mechanism 7.

(24) Although the disclosure has been described with reference to a particular embodiment, those skilled in the art will understand that a number of variations may be made in form and detail without departing from the spirit and scope of the appended claims and their equivalents of this disclosure.