CN114335063A - Display panel, device and micro light-emitting diode transfer device and method - Google Patents
Display panel, device and micro light-emitting diode transfer device and method Download PDFInfo
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Abstract
The embodiment of the invention discloses a display panel, a device and a micro light-emitting diode transfer device and method. The display panel comprises a receiving substrate and a micro light-emitting diode positioned on one side of the receiving substrate; the micro light emitting diodes are transferred through a fluid transfer channel comprising a curved conduit and a linear conduit connected to each other. The micro light-emitting diodes flow and transfer in the bent pipeline and the linear pipeline of the fluid transmission channel, so that the micro light-emitting diodes are accurately butted with the receiving substrate, the huge transfer of the micro light-emitting diodes is realized, the transfer efficiency is improved, and the complexity of the manufacturing process is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of display panels, in particular to a display panel, a device and a micro light-emitting diode transfer device and method.
Background
Micro light emitting diodes (Micro LEDs) have the characteristics of self-luminescence, simple structure, small volume and energy saving, and more manufacturers begin to develop Micro light emitting diode display panels, which are expected to become the next generation display technology. However, for the current manufacturing of the micro light emitting diode display panel, due to the limitation of the manufacturing process, the micro light emitting diode cannot be efficiently and accurately transferred.
Disclosure of Invention
The embodiment of the invention provides a display panel, a device and a micro light-emitting diode transfer device and method, which are used for transferring micro light-emitting diodes through a fluid transmission channel, so that the micro light-emitting diodes are accurately butted with a receiving substrate, normal display of the display panel is ensured, and the complexity of a manufacturing process is reduced.
In a first aspect, an embodiment of the present invention provides a display panel, including: the micro-LED module comprises a receiving substrate and a micro-LED positioned on one side of the receiving substrate;
the micro light emitting diodes are transferred through a fluid transfer channel comprising a curved conduit and a linear conduit connected to each other.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel according to the first aspect.
In a third aspect, an embodiment of the present invention further provides a transfer device for micro light emitting diodes, including a fluid transmission channel and a fluid located in the fluid transmission channel, where the micro light emitting diodes are suspended in the fluid;
the fluid transmission channel comprises an inlet end, an outlet end and a fluid transmission pipeline positioned between the inlet end and the outlet end, and the fluid transmission pipeline comprises a bent pipeline and a straight pipeline which are connected with each other;
the linear pipeline is further provided with a hollow part, the hollow part penetrates through the pipe wall of the linear pipeline and is arranged at a preset distance, and the micro light-emitting diode is transferred to the receiving substrate through the hollow part.
In a fourth aspect, an embodiment of the present invention further provides a method for transferring a micro light emitting diode, which is applied to the micro light emitting diode transfer apparatus in any one of the third aspects, and includes:
controlling the flow of micro light emitting diodes in the fluid transmission channel;
and controlling the micro light-emitting diode to be transferred to the receiving substrate through the hollow part.
The invention provides a display panel, which comprises a receiving substrate and a micro light-emitting diode positioned on one side of the receiving substrate; the micro light emitting diodes are transferred through a fluid transfer channel comprising a curved conduit and a linear conduit connected to each other. The micro light-emitting diodes flow and transfer in the bent pipeline and the linear pipeline of the fluid transmission channel, so that the micro light-emitting diodes are accurately butted with the receiving substrate, the huge transfer of the micro light-emitting diodes is realized, the transfer efficiency is improved, and the complexity of the manufacturing process is reduced.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description, although being some specific embodiments of the present invention, can be extended and extended to other structures and drawings by those skilled in the art according to the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention, without making sure that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a manufacturing process of a display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a transfer device for micro light emitting diodes according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a portion of a fluid transport channel according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a portion of another fluid transport pipeline according to an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view along AA' of FIG. 6;
fig. 10 is a schematic flow chart illustrating a transfer method of a micro light emitting diode according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the basic idea disclosed and suggested by the embodiments of the present invention, are within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and as shown in fig. 1, the display panel 100 includes: a receiving substrate 101 and a micro light emitting diode 102 positioned at one side of the receiving substrate 101; the micro-leds 102 are transferred through a fluid transfer channel comprising a curved conduit and a straight conduit connected to each other.
The receiving substrate 101 includes a substrate and a pixel driving circuit on one side of the substrate. The Micro light emitting diodes 102 may be Micro LEDs or Mini LEDs. The receiving substrate 101 is electrically connected to the micro light emitting diodes 102, and the micro light emitting diodes 102 are driven to emit light by the pixel driving circuit of the receiving substrate 101.
Different from the conventional diode transfer device, the embodiment of the invention creatively adopts the fluid transmission channel to transfer the micro light-emitting diode. Specifically, fluid is arranged in the fluid transmission channel, and the micro light-emitting diode is suspended in the fluid. Further set up fluid transmission channel and include interconnect's crooked pipeline and sharp pipeline, through the atress condition of rational adjustment little emitting diode 102 in crooked pipeline and sharp pipeline for little emitting diode 102 arranges with the default distance in fluid transmission channel 103, later transports receiving substrate 101 through the fretwork portion that sets up in the fluid transmission channel on, so can guarantee little emitting diode 102 and receiving substrate 101 counterpoint precision, and can promote transport efficiency. The aligned micro light emitting diode 102 and the receiving substrate 101 may be bonded by a heating or photo-curing process to prepare the display panel 100, so as to ensure normal display of the display panel 100.
According to the embodiment of the invention, the micro light-emitting diodes flow and transfer through the bent pipeline and the linear pipeline in the fluid transmission channel, so that the micro light-emitting diodes are arranged at intervals in the fluid transmission channel and are accurately aligned with the receiving substrate, the mass transfer of the micro light-emitting diodes is realized, the transfer efficiency is improved, the micro light-emitting diodes and the receiving substrate form the display panel, the manufacturing process is effectively simplified, and the normal display of the display panel is ensured.
As an implementation manner, fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention, as shown in fig. 2, optionally, the micro light emitting diode 102 includes a first electrode 104 and a second electrode 105 facing the receiving substrate 101; the receiving substrate 101 includes a first groove 106 and a second groove 107, a first substrate electrode 108 is disposed in the first groove 106, and a second substrate electrode 109 is disposed in the second groove 107; the first substrate electrode 108 is electrically connected to the first electrode 104, and the second substrate electrode 109 is electrically connected to the second electrode 105.
The micro light emitting diode 102 may include a first electrode 104 and a second electrode 105 located on the same side, and the first electrode 104 and the second electrode 105 may be an anode and a cathode, respectively. The first electrode 104 and the second electrode 105 are both located on the side facing the receiving substrate 101, so as to be butted against the receiving substrate 101. Corresponding to the structure of the micro light emitting diode 102, the receiving substrate 101 is provided with a first groove 106 and a second groove 107 for accommodating the first electrode 104 and the second electrode 105, respectively, and meanwhile, the first groove 106 is provided with a first substrate electrode 108, the second groove 107 is provided with a second substrate electrode 109, the first electrode 104 is electrically connected with the first substrate electrode 108, and the second electrode 105 is electrically connected with the second substrate electrode 109, so that the micro light emitting diode 102 receives a driving signal output by the first substrate electrode 108 and the second substrate electrode 109, and drives the micro light emitting diode 102 to emit light for display. Meanwhile, the design of the first groove 106 and the second groove 107 improves the butt joint effect of the micro light emitting diode 102 and the receiving substrate 101, reduces the overall thickness of the display panel 100, and is beneficial to the light and thin design of the display panel 100.
Fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention, as shown in fig. 3, optionally, the micro light emitting diode 102 includes a center of gravity adjusting structure 110 facing the side of the receiving substrate 101 and located between the first electrode 104 and the second electrode 105, the receiving substrate 101 includes a third groove 111 facing the side of the micro light emitting diode 102 and located between the first substrate electrode 108 and the second substrate electrode 109, and the center of gravity adjusting structure 110 is abutted to the third groove 111.
The center of gravity adjusting structure 110 is arranged on one side of the micro light emitting diode 102, the center of gravity of the micro light emitting diode 102 is adjusted through the center of gravity adjusting structure 110, and the transfer form of the micro light emitting diode 102 in the fluid is controlled, so that the micro light emitting diode 102 can be transferred by the adjusted center of gravity, and the micro light emitting diode 102 is conveniently butted with the receiving substrate 101. The first electrode 104 and the second electrode 105 of the micro light emitting diode 102 may be adjusted, for example, by the center of gravity adjustment structure 110 to interface with the receiving substrate 101 toward the side of the receiving substrate 101, facilitating better interfacing of the first electrode 104 and the second electrode 105 with the first substrate electrode 108 and the second substrate electrode 109. Further, the receiving substrate 101 is correspondingly configured according to the transfer state of the micro light emitting diodes 102, so that the transferred micro light emitting diodes 102 are ensured to be received by the receiving substrate 101. Specifically, the third groove 111 abutting against the gravity center adjusting structure 110 is formed in the receiving substrate 101, the third groove 111 abuts against the gravity center adjusting structure 110, and at least part of the gravity center adjusting structure 110 is arranged in the third groove 111 after the third groove 111 abuts against the gravity center adjusting structure, so that the entire thickness of the display panel 100 is not increased while the abutting accuracy between the micro light emitting diode 102 and the receiving substrate 101 is increased, and the light and thin design of the display panel 100 is facilitated.
Further, the first groove 106, the second groove 107 and the third groove 111 are all prepared on one side of the receiving substrate 101 by adopting an etching process, and can be prepared in the same etching process, so that the preparation processes of the first groove 106, the second groove 107 and the third groove 111 are simple and efficient.
As another possible implementation, with continued reference to fig. 2, the first electrode 104 and the first substrate electrode 108 are provided with charges of opposite polarity, respectively, and the second electrode 105 and the second substrate electrode 109 are provided with charges of opposite polarity, respectively.
By the principle that electrostatic charges with opposite polarities attract each other and electrostatic charges with the same polarity repel each other, charges with opposite polarities can be applied to the first electrode 104 and the first substrate electrode 108, the first electrode 104 and the first substrate electrode 108 attract each other by the charges with opposite polarities, the second electrode 105 and the second substrate electrode 109 apply charges with opposite polarities, and the second electrode 105 and the second substrate electrode 109 attract each other by the charges with opposite polarities, so that accurate butt joint of the micro light emitting diode 102 and the receiving substrate 101 is ensured. Further, in order to ensure the accuracy of the alignment between the first electrode 104 and the second electrode 105 of the micro light emitting diode 102 and the first substrate electrode 108 and the second substrate electrode 109 of the receiving substrate 101, charges with opposite polarities may be applied to the first electrode 104 and the second electrode 105, for example, the first electrode 104 applies negative charges, the first substrate electrode 108 corresponding to the first electrode 104 applies positive charges, the second electrode 105 applies positive charges, and the second substrate electrode 109 corresponding to the second electrode 105 applies negative charges, so as to ensure the accuracy of the alignment between the micro light emitting diode 102 and the receiving substrate 101. The phenomenon that the connection between the first electrode 104 and the second electrode 105 of the micro light emitting diode 102 and the first substrate electrode 108 and the second substrate electrode 109 of the receiving substrate 101 are opposite due to the fact that the same polarity charges are correspondingly applied to the first electrode 104 and the second electrode 105 when the same polarity charges are applied to the first electrode 104 and the second electrode 105, and the normal display of the display panel 100 is seriously affected is avoided. The micro light-emitting diode 102 and the receiving substrate 101 are butted by an electrostatic charge attraction or repulsion principle, the structure of the micro light-emitting diode 102 is prevented from being improved by an additional preparation process, the first electrode 104, the second electrode 105, the first substrate electrode 108 and the second substrate electrode 109 are only needed to be realized by a friction electrification mode or a data line charge application mode, and the difficulty of the preparation process and the manufacturing cost are reduced.
Further, fig. 4 is a schematic structural diagram of a manufacturing process of a display panel according to an embodiment of the present invention, as shown in fig. 4, a first clamping structure 112 is disposed on a side wall of the first groove 106, a second clamping structure 113 is disposed on a side wall of the second groove 107, a third clamping structure 114 is disposed on a side wall of the first electrode 104, and a fourth clamping structure 115 is disposed on a side wall of the second electrode 105; the first clamping structure 112 is clamped with the third clamping structure 114, and the second clamping structure 113 is clamped with the fourth clamping structure 115.
A first clamping structure 112 is arranged on the side wall of the first groove 106 of the receiving substrate 101, a third clamping structure 114 is arranged on the first electrode 104 of the corresponding micro light emitting diode 102, the first clamping structure 112 is clamped with the third clamping structure 114, a second clamping structure 113 is arranged on the side wall of the second groove 107, and a fourth clamping structure 115 is arranged on the side wall of the corresponding second electrode 105; the second clamping structure 113 and the fourth clamping structure 115 are clamped, when the first groove 106 and the second groove 107 are prepared, the first clamping structure 112 and the second clamping structure 113 are formed by etching at the same time, and the third clamping structure 114 and the fourth clamping structure 115 are formed synchronously when the first electrode 104 and the second electrode 105 are formed again, so that additional process steps are not required. Meanwhile, due to the arrangement of the clamping structure, the connection firmness of the butted micro light emitting diode 102 and the receiving substrate 101 is effectively improved, the connection effect is ensured, and the structural stability of the display panel 100 is further ensured.
Based on the above inventive concept, fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 5, a display device 200 includes the display panel 100 according to the above embodiment.
It should be noted that, since the display device provided in this embodiment has the same or corresponding advantages of the display panel of the foregoing embodiment, no further description is provided herein. The display device 200 provided in the embodiment of the present invention may be a mobile phone shown in fig. 5, and may also be any electronic product with a display function, including but not limited to the following categories: the touch screen display system comprises a television, a notebook computer, a desktop display, a tablet computer, a digital camera, an intelligent bracelet, intelligent glasses, a vehicle-mounted display, medical equipment, industrial control equipment, a touch interaction terminal and the like, and the embodiment of the invention is not particularly limited in this respect.
Based on the same inventive concept, fig. 6 is a schematic structural diagram of a micro light emitting diode transfer device according to an embodiment of the present invention, as shown in fig. 6, the micro light emitting diode transfer device 300 includes a fluid transmission channel 103 and a fluid 116 located in the fluid transmission channel 103, and a micro light emitting diode 102 is suspended in the fluid 116; the fluid transfer passage 103 comprises an inlet end 117, an outlet end 118 and a fluid transfer conduit 119 between the inlet end 117 and the outlet end 118, the fluid transfer conduit 119 comprising a curved conduit 1031 and a linear conduit 1032 connected to each other; the linear channel 1032 is further provided with a hollow portion 120, the hollow portion 120 penetrates through a wall of the linear channel 1032 and is arranged at a preset distance, and the micro light emitting diode 102 is transferred to the receiving substrate 101 through the hollow portion 120.
The fluid 116 is used for carrying the micro light emitting diode 102, so that the micro light emitting diode 102 flows and transfers in the fluid transmission channel 103, the fluid 116 may be an insulating organic solution or an insulating inorganic solution, and does not affect the butt joint between the micro light emitting diode 102 and the receiving substrate 101, and the selection of the fluid 116 may be selected according to actual design requirements, which is not specifically limited in the embodiment of the present invention. When the fluid 116 is determined, the fluid viscosity and the fluid density are fixed values. The fluid transfer channel 103 includes an inlet end 117, an outlet end 118, and a fluid transfer tube 119 between the inlet end 117 and the outlet end 118, and the fluid 116 and the micro light emitting diodes 102 enter the fluid transfer tube 119 from the inlet end 117. Fig. 7 is a schematic partial structure view of a fluid transmission channel according to an embodiment of the present invention, in which the fluid transmission channel 119 includes a curved conduit 1031 and a straight conduit 1032 connected to each other, and since the Micro light emitting diode 102 may be a Micro LED or a Mini LED, and the size of the Micro light emitting diode is on the micrometer scale, as shown in fig. 7, the Micro light emitting diode 102 experiences an inertial lift force F in the straight conduit 1032LEffect of, inertial lift force FLComprising a fluidThe lifting force F1 and the micro light-emitting diodes 102 generated by the shear force gradient generated by the uniform flow velocity are induced to move to the pipe wall position of the linear pipeline 1032, the lifting force F2, the lifting force F1 and the lifting force F2 generated by the pipe wall induction are opposite in direction, so that the micro light-emitting diodes 102 are subjected to inertial lifting force F2LOf the linear duct 1032, relative movement in the cross-section of the duct, inertial lift force FLSatisfy the requirement of
For lift coefficient, Re is the reynolds number of the fluid, x is the width of the fluid transport channel 103, H is the height of the fluid transport channel 103, ρ is the fluid density, U is the average flow velocity of the fluid 116, a is the size of the micro-leds 102, and H is the hydraulic diameter of the fluid transport channel 103. When the micro-LEDs 102 move to a certain balance position of the cross section, the values of the lifting force F1 and the lifting force F2 are equal, and the inertial lifting force F is equalLTo be zero, the micro-leds 102 are stable in the equilibrium position, and for the case where the fluid transmission channel 103 is fixed, the fluid 116 is fixed, and the size of the micro-leds 102 is fixed, the flow rate of the fluid needs to be adjusted to determine the equilibrium position of the micro-leds 102. Because a large number of micro-leds 102 are present in the fluid transport pipe 119, the micro-leds 102 converge to flow in focus and move toward the outlet end 118 according to the flow direction (e.g., X direction in fig. 6) and the flow velocity of the fluid. When the micro led 102 moves to the curved pipe 1031, the centrifugal force on the fluid in the central region of the curved pipe 1031 is the largest, so that the fluid 116 flows to the pipe wall, the flow velocity of the fluid near the pipe wall is the smallest, the centrifugal force is the smallest, and the fluid is extruded by the fluid in the central region, so as to ensure the conservation of mass of each position of the fluid 116, a pair of symmetric dean vortexes rotating in opposite directions are formed perpendicular to the flow direction of the fluid, the dean vortexes are respectively positioned at the upper part and the lower part of the cross section of the curved pipe, and the dean number De can reflect the dimensionless number and dean number of the dean vortexes strength
Where Re is the reynolds number of the fluid 116, H is the hydraulic diameter of the fluid transfer channel 103, r is the radius of curvature of the curved conduit 1031, the greater the dean number De, the stronger the dean vortex strength, and when the fluid transfer channel 103 is fixed and the fluid 116 is fixed, the magnitude of the dean number De may be adjusted by controlling the reynolds number Re of the fluid 116. Micro-leds 102 in fluid 116 experience dean drag force F due to dean vortex flowDSo that the micro-leds 102 experience an inertial lift force F within the bent pipe 1031LAnd dean drag force FDIn the combined action of dean drag force FDThe micro leds 102 located near the wall of the pipe move towards the central region of the pipe and can reach the equilibrium position faster. In order to ensure that the micro light emitting diodes 102 are uniformly arranged at a preset distance, the linear pipes 1032 and the bent pipes 1031 are alternately connected in series, the micro light emitting diodes 102 enter the bent pipes 1031 from the linear channels and then enter the linear channels again through the bent pipes 1031, and the plurality of linear pipes 1032 and the bent pipes 1031 are alternately connected in series, so that a large number of micro light emitting diodes 102 can be positioned in the central area of the pipes and in the balance position as much as possible and arranged at a preset distance. Corresponding to the flow transfer situation of the micro light emitting diode 102, the linear pipe 1032 in the fluid transmission pipe 119 is further provided with the hollowed-out portion 120, the hollowed-out portions 120 penetrate through the pipe wall of the linear pipe 1032 and are arranged at a preset distance, and the size of the hollowed-out portion 120 is larger than that of the micro light emitting diode 102, so that when the micro light emitting diode 102 flows to the position right above the hollowed-out portion 120, the flow transfer frequency of the micro light emitting diode 102 is matched, an external force is applied to the side, away from the fluid transmission channel 103, of the receiving substrate 101, so that the micro light emitting diode 102 is transferred to the receiving substrate 101 through the hollowed-out portion 120, by setting the number of the linear pipe 1032 and the curved channel in the fluid transmission channel 103 and the number of the hollowed-out portions 120, the transfer number of the micro light emitting diode 102 can be realized, further, the huge transfer of the micro light emitting diode 102 can be realized through one-time operation, the transfer difficulty is reduced, and the manufacturing cost is saved, meanwhile, the transfer precision is ensured, and the display effect of the display panel manufactured by the micro light-emitting diode 102 and the transfer substrate is ensured.
According to the embodiment of the invention, the fluid bearing micro light-emitting diodes enter the fluid transmission pipeline through the inlet end of the fluid transmission channel and flow and transfer in the fluid transmission pipeline, the fluid transmission pipeline comprises the bent pipeline and the linear pipeline which are connected with each other, so that the micro light-emitting diodes are arranged in the fluid transmission pipeline at the preset distance, the micro light-emitting diodes are transferred to the receiving substrate through the hollow parts, the hollow parts penetrate through the pipe wall of the linear pipeline and are arranged at the preset distance, the micro light-emitting diodes are accurately aligned with the receiving substrate, the transfer difficulty is reduced, and the display effect of the display panel formed by the micro light-emitting diodes and the receiving substrate is further ensured.
With continued reference to fig. 6, optionally, the fluid delivery channel 103 includes a first fluid delivery channel 1033 and a second fluid delivery channel 1034 coupled to each other, the first fluid delivery channel 1033 is located on a side of the second fluid delivery channel 1034 adjacent to the inlet port 117, the micro-leds 102 are arranged in the first fluid delivery channel 1033 in a pre-focus arrangement along a fluid flow direction, and the micro-leds 102 are arranged in the second fluid delivery channel 1034 at a predetermined distance along the fluid flow direction.
Wherein, the fluid transmission channel 103 comprises a first fluid transmission channel 1033 and a second fluid transmission channel 1034 which are connected with each other, the first fluid transmission channel 1033 is located at one side of the second fluid transmission channel 1034 close to the inlet end 117, the first fluid transmission channel 1033 and the second fluid transmission channel 1034 both comprise a straight pipe 1032 and a curved pipe 1031, and since the micro-light emitting diode 102 is in a chaotic state when entering the fluid transmission pipe 119 from the inlet end 117, it needs to be subjected to an inertial lifting force F in the fluid transmission pipe 119LAnd dean drag force FDThe balance position adjustment is performed, so that the micro-leds 102 are pre-focused and arranged in the first fluid transmission channel 1033 along the fluid flow direction, after passing through the plurality of linear channels and the curved channels in the first fluid transmission channel 1033, the micro-leds 102 are arranged in the second fluid transmission channel 1034 at a predetermined distance along the fluid flow direction, the micro-leds 102 are all located in the central region of the fluid transmission channel and are all at the balance position, the distance between adjacent micro-leds 102 and the distance between adjacent hollow-out portions 120 are all located between adjacent micro-leds 102The predetermined distances are the same, so that the micro light emitting diodes 102 are conveniently transferred to the receiving substrate 101 through the hollow portion 120, and the transfer efficiency is improved.
With continued reference to fig. 6, optionally, the curved conduits 1031 and the linear conduits 1032 are alternately arranged in series, the linear conduits 1032 extending for a length L,
where n is the number of linear channels 1032 disposed in the first fluid transport channel 1033, μ is the viscosity of the fluid, H is the hydraulic diameter of the fluid transport channel 103, ρ is the density of the fluid, U is the average flow velocity of the fluid, a is the size of the micro-leds 102, and f is the average flow velocity of the fluidLIs the lift coefficient.
Wherein, for the case of fixed fluid, fixed size of the micro light emitting diodes 102 and fixed fluid transfer channel 103, i.e. fluid viscosity μ, fluid density ρ, hydraulic diameter H of the fluid transfer channel 103, the number n of the straight conduits 1032 disposed in the first fluid transfer channel 1033, the size a of the micro light emitting diodes 102 are all fixed, the lift coefficient f is fixedLIs a value related to the Reynolds number Re of the fluid and the cross-sectional dimension of the fluid transfer passage 103, so that the lift coefficient fLAlso of fixed value, so that an extension length L of the rectilinear tract 1032 is satisfied,
at this time, the average flow velocity U of the fluid may be controlled, and under the condition that the fluid is fixed, the size of the micro light emitting diode 102 is fixed, and the fluid transmission channel 103 is fixed, the micro light emitting diode 102 is arranged in the pre-focusing arrangement in the first fluid transmission channel 1033 of the fluid transmission channel 119, and is arranged in the central area of the fluid transmission channel 103 as much as possible, so that the micro light emitting diode 102 entering the second fluid transmission channel 1034 subsequently is arranged at a preset distance in the fluid flow direction, and is convenient to transfer to the receiving substrate 101 at the preset distance, thereby improving the transfer accuracy and reducing the difficulty of the manufacturing process.
With continued reference to fig. 6, optionally, the curved conduits 1031 and the linear conduits 1032 are alternately arranged in series, and the reynolds number Re of the fluid 116 satisfies:
and Re is more than or equal to 1 and less than or equal to 2000;
where ρ is the fluid density, U is the average flow velocity of the fluid, H is the hydraulic diameter of the fluid transport channel 103, and μ is the fluid viscosity.
Wherein the Reynolds number Re of the fluid 116 is related to the property of the fluid 116 and the hydraulic diameter of the fluid transmission channel 103, and for the micro light-emitting diode 102 transfer device with the fixed fluid 116 and the fixed fluid transmission channel 103, the average flow speed of the fluid 116 can be controlled to realize the adjustment of the Reynolds number Re of the fluid 116, which is combined with the Reynolds number Re of the micro light-emitting diode 102pSatisfy the following requirements
a is the size of the micro light-emitting diode 102, and the Reynolds number Re of the micro light-emitting diode 102 is controlled reasonablypAnd the reynolds number Re of the fluid 116, so that the micro light emitting diode 102 satisfies the inertial micro-flow principle in the fluid 116, and the micro light emitting diode 102 flows in the fluid transmission channel 103 and is arranged at a preset distance, thereby realizing the mass transfer of the micro light emitting diode 102.
With continued reference to fig. 6, optionally, the curved conduits 1031 and the linear conduits 1032 are alternately arranged in series, and the stress on the micro-leds 102 in the curved conduits 1031 includes an inertial lift force and a dean drag force, and a ratio R of the inertial lift force to the dean drag forceFThe requirements are met,
and R isF＞0.04；
Where a is the size of the micro-LEDs 102, R1The maximum outside bend radius of the bent conduit 1031, H is the hydraulic diameter of the fluid transfer channel 103.
Wherein, on the premise of the fixed size of the micro light emitting diode 102, the maximum bending radius R of the outer side of the bent pipe 1031 of the fluid transfer channel 103 is reasonably set1And the hydraulic diameter H of the fluid transfer channel 103, so as to adjust the numerical relationship between the inertial lift force and the dean drag force in the curved conduit 1031, so that the micro light emitting diodes 102 can reach preset equilibrium positions as soon as possible after the adjustment of the curved conduit 1031, the micro light emitting diodes 102 are arranged in the fluid transfer channel 103 at preset distances, the transfer efficiency of the micro light emitting diodes 102 is improved, and the huge transfer of the micro light emitting diodes 102 is further realized.
With continued reference to fig. 6, optionally, the transfer device of the micro-led 102 further comprises a flow rate regulating pump (not shown) located at the side of the inlet port 117 away from the fluid transport tube 119, the flow rate regulating pump being configured to control the flow rate of the fluid 116 flowing into the inlet port 117.
Before the micro light emitting diodes 102 enter the fluid transmission pipeline 119, a fluid transmission pump is arranged at the inlet end 117 of the fluid transmission channel 103, the flow rate adjusting pump controls the flow rate of the fluid flowing into the inlet end 117 by transmitting mechanical energy or other external energy to the fluid, so as to realize the flow of the micro light emitting diodes 102 carried in the fluid 116 in the fluid transmission pipeline 119, and the micro light emitting diodes 102 are arranged at a preset distance in a second fluid transmission channel 1034 of the fluid transmission channel 103 by combining the structure of the fluid transmission pipeline 119.
With continued reference to fig. 6, optionally, the fluid transport channel 103 has an inner diameter of L1 and the micro leds 102 have a size of L2, wherein L2< L1<2 × L2.
In order to ensure that the micro light emitting diodes 102 flow and transfer normally in the fluid transmission channel 103, the inner diameter of the fluid transmission channel 103 is larger than the size of the micro light emitting diodes 102, so that the micro light emitting diodes 102 can flow and transfer in the fluid transmission channel 103, and then transfer to the receiving substrate 101. Optionally, in order to ensure that the micro light emitting diodes 102 are arranged in a row in the fluid transmission channel 103 and at intervals of a preset distance, and are convenient to transfer from the hollow portion 120 subsequently, the size of the micro light emitting diodes 102 with the inner diameter of the fluid transmission channel 103 smaller than two times is designed, so as to adjust the flow rate of the fluid, the micro light emitting diodes 102 are arranged in the fluid transmission channel 103 at equal intervals in a row, so that the alignment accuracy of the micro light emitting diodes 102 and the hollow portion 120 of the fluid transmission channel 103 is improved, and further, the micro light emitting diodes 102 are guaranteed to be accurately transferred to the receiving substrate 101, and the transfer length of the fluid transmission channel 103 is reasonably set, so that the huge transfer of the micro light emitting diodes 102 is realized.
Fig. 8 is a partial structural schematic view of another fluid transportation pipeline provided in an embodiment of the present invention, and as shown in fig. 8, a cross section of the fluid transportation pipeline 119 may optionally include at least one of a rectangle, a square, or a circle.
In fig. 8, it is exemplarily shown that the cross section of the fluid transportation pipeline 119 is rectangular, the cross sections of the fluid transportation pipelines 119 are different, so that the hydraulic diameters H of the fluid transportation pipelines 119 are different, and when the interface of the fluid transportation pipeline 119 is rectangular, the hydraulic diameters H satisfy,
x is the width of the fluid transport pipe 119, and h is the height of the fluid transport pipe 119. The hydraulic diameter H is the width of the fluid transport conduit 119 when the interface to the fluid transport conduit 119 is square. The hydraulic diameter H is the diameter of the fluid transport conduit 119 when the interface to the fluid transport conduit 119 is circular. The type of the cross section of the fluid transmission pipeline 119 may be selected according to actual design requirements, and the embodiment of the present invention is not particularly limited. The section type of the fluid transmission pipeline 119 is reasonably set, so that the stress condition of the micro light-emitting diodes 102 in the fluid transmission pipeline 119 and the arrangement condition of the micro light-emitting diodes 102 in the fluid transmission pipeline 119 are controlled.
Fig. 9 is a schematic cross-sectional view along AA' of fig. 6, and as shown in fig. 9, optionally, the micro light emitting diode 102 further includes a first magnetic structure 121, and the first magnetic structure 121 is used for attracting the second magnetic structure 122 located on one side of the receiving substrate 101.
In order to ensure that the micro light emitting diode 102 is transferred from the hollow portion 120 to the receiving substrate 101 through the fluid transmission channel 103, the first magnetic structure 121 is disposed on the micro light emitting diode 102, such that when the micro light emitting diode 102 reaches a position corresponding to the hollow portion 120, the second magnetic structure 122 is disposed on a side of the receiving substrate 101 away from the fluid transmission channel 103, the second magnetic structure 122 may be a magnetic device outside the receiving substrate 101, and the magnetic properties of the second magnetic structure 122 and the first magnetic structure 121 are controlled to be opposite to each other in accordance with the transfer frequency of the micro light emitting diodes 102 sequentially arranged in the second fluid transmission channel 1034 of the fluid transmission channel 103, and the second magnetic structure 122 and the first magnetic structure 121 attract each other, such that the micro light emitting diode 102 located in the fluid transmission channel 103 is transferred onto the receiving substrate 101 through the hollow portion 120. Because the arrangement of the micro light emitting diodes 102 and the hollow parts 120 is uniform, the arrangement of the grooves of the corresponding receiving substrate 101 is the same as the arrangement of the hollow parts 120 of the fluid transmission channel 103, so that the regular arrangement of the micro light emitting diodes 102 on the receiving substrate 101 is ensured, and the difficulty in subsequent manufacturing of the display panel is reduced.
With continued reference to fig. 9, optionally, the micro-leds 102 comprise a first electrode 104 and a second electrode 105, and the receiving substrate 101 comprises a first substrate electrode 108 and a second substrate electrode 109; the first magnetic structure 121 includes a first sub-magnetic structure 1211 and a second sub-magnetic structure 1212, the first sub-magnetic structure 1211 is disposed corresponding to the first electrode 104, the second sub-magnetic structure 1212 is disposed corresponding to the second electrode 105, and the first sub-magnetic structure 1211 and the second sub-magnetic structure 1212 are opposite in magnetic property; the second magnetic structure 122 includes a third sub-magnetic structure 1221 and a fourth sub-magnetic structure 1222, the third sub-magnetic structure 1221 is disposed corresponding to the first substrate electrode 108, the fourth sub-magnetic structure 1222 is disposed corresponding to the second substrate electrode 109, the third sub-magnetic structure 1221 is opposite to the first sub-magnetic structure 1211, and the fourth sub-magnetic structure 1222 is opposite to the second sub-magnetic structure 1212; the first sub-magnetic structure 1211 is configured to attract the third sub-magnetic structure 1221, and the second sub-magnetic structure 1212 is configured to attract the fourth sub-magnetic structure 1222.
The first sub-magnetic structure 1211 and the second sub-magnetic structure 1212 are correspondingly disposed on the first electrode 104 and the second electrode 105 of the micro led 102, respectively, so as to ensure the transfer alignment precision of the micro led 102, such that the first sub-magnetic structure 1211 and the second sub-magnetic structure 1212 have opposite magnetism, thereby facilitating to distinguish the first electrode 104 and the second electrode 105 of the micro led 102. Meanwhile, a third sub-magnetic structure 1221 is correspondingly arranged on the side of the first substrate electrode 108 of the receiving substrate 101 away from the fluid transmission channel 103, and a fourth sub-magnetic structure 1222 is correspondingly arranged on the side of the second substrate electrode 109 away from the fluid transmission channel 103, when the micro light emitting diode 102 is transferred to the transfer substrate, the third sub-magnetic structure 1221 is opposite to the first sub-magnetic structure 1211, and the first sub-magnetic structure 1211 and the third sub-magnetic structure 1221 attract each other; the fourth sub-magnetic structure 1222 is opposite to the second sub-magnetic structure 1212, the second sub-magnetic structure 1212 and the fourth sub-magnetic structure 1222 are attracted to each other, and the first sub-magnetic structure 1211, the second sub-magnetic structure 1212, the third sub-magnetic structure 1221, and the fourth sub-magnetic structure 1222 may be electromagnetic structures, and have a certain electric conduction capability, so as to ensure that the first electrode 104 and the second electrode 105 of the micro light emitting diode 102 are electrically connected to the first substrate electrode 108 and the second substrate electrode 109 of the transfer substrate, respectively, and by providing the magnetic structures, the transfer accuracy is effectively improved, and the manufacturing difficulty of the display panel is reduced.
Based on the above inventive concept, fig. 10 is a schematic flow chart of a micro led transferring method according to an embodiment of the present invention, as shown in fig. 10, and is characterized in that, when applied to the micro led transferring apparatus according to any one of the above embodiments, the micro led transferring method includes:
and S101, controlling the micro light-emitting diode to flow in the fluid transmission channel.
For the micro light-emitting diodes and the fluid transmission channel with fixed sizes, the flowing of the micro light-emitting diodes in fluid transmission can be controlled by adjusting the property and the flowing speed of fluid in the fluid transmission channel, the micro light-emitting diodes are uniformly distributed, the follow-up huge transfer of the micro light-emitting diodes is facilitated, and the transfer difficulty is reduced.
S102, controlling the micro light-emitting diode to be transferred to the receiving substrate through the hollow part.
The micro light-emitting diodes are uniformly distributed in the linear pipeline of the second fluid transmission channel of the fluid transmission channel, the transfer frequency of the micro light-emitting diodes in the fluid is adjusted by controlling the flow rate of the fluid, so that the distribution mode of the micro light-emitting diodes is the same as that of the hollow parts on the fluid transmission channel, and further, when the vertical projections of the micro light-emitting diodes and the hollow parts on the receiving substrate are overlapped by applying external acting force, such as magnetic force, a plurality of micro light-emitting diodes which are uniformly distributed are all transferred to the receiving substrate through the hollow parts, so that the huge transfer of the micro light-emitting diodes is realized, and the display panel is obtained by subsequently bonding the micro light-emitting diodes and the receiving substrate.
According to the embodiment of the invention, the flow of the micro light-emitting diodes in the fluid transmission channel is regulated, and the arrangement mode of the micro light-emitting diodes in the fluid transmission channel is controlled, so that the micro light-emitting diodes can be transferred from the hollow part to the receiving substrate under the action of external force, the huge transfer of the micro light-emitting diodes is realized, the complexity of the preparation process is simplified, and the manufacturing cost is reduced.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (17)
1. A display panel, comprising: the micro-LED module comprises a receiving substrate and a micro-LED positioned on one side of the receiving substrate;
the micro light emitting diodes are transferred through a fluid transfer channel comprising a curved conduit and a linear conduit connected to each other.
2. The display panel according to claim 1, wherein the micro light emitting diode comprises a first electrode and a second electrode facing a side of the receiving substrate; the receiving substrate comprises a first groove and a second groove, a first substrate electrode is arranged in the first groove, and a second substrate electrode is arranged in the second groove; the first substrate electrode is electrically connected to the first electrode, and the second substrate electrode is electrically connected to the second electrode.
3. The display panel according to claim 2, wherein the micro light emitting diode includes a center of gravity adjusting structure facing a side of the receiving substrate and located between the first electrode and the second electrode, the receiving substrate includes a third groove facing a side of the micro light emitting diode and located between the first substrate electrode and the second substrate electrode, and the center of gravity adjusting structure is butted against the third groove.
4. The display panel according to claim 2, wherein the first electrode and the first substrate electrode are provided with charges having opposite polarities, respectively, and the second electrode and the second substrate electrode are provided with charges having opposite polarities, respectively.
5. The display panel according to claim 3 or 4, wherein a first clamping structure is arranged on a side wall of the first groove, a second clamping structure is arranged on a side wall of the second groove, a third clamping structure is arranged on a side wall of the first electrode, and a fourth clamping structure is arranged on a side wall of the second electrode;
the first clamping structure is clamped with the third clamping structure, and the second clamping structure is clamped with the fourth clamping structure.
6. A display device characterized by comprising the display panel according to claims 1 to 5.
7. The transfer device for the micro light-emitting diodes is characterized by comprising a fluid transmission channel and a fluid positioned in the fluid transmission channel, wherein the micro light-emitting diodes are suspended in the fluid;
the fluid transmission channel comprises an inlet end, an outlet end and a fluid transmission pipeline positioned between the inlet end and the outlet end, and the fluid transmission pipeline comprises a bent pipeline and a straight pipeline which are connected with each other;
the linear pipeline is further provided with a hollow part, the hollow part penetrates through the pipe wall of the linear pipeline and is arranged at a preset distance, and the micro light-emitting diode is transferred to the receiving substrate through the hollow part.
8. The micro-led transfer device of claim 7, wherein the fluid transmission channel comprises a first fluid transmission channel and a second fluid transmission channel connected to each other, the first fluid transmission channel is located on one side of the second fluid transmission channel near the inlet end, the micro-leds are pre-focused in the first fluid transmission channel along the fluid flow direction, and the micro-leds are arranged in the second fluid transmission channel at a predetermined distance along the fluid flow direction.
9. The micro LED transfer device of claim 8, wherein the curved conduits and the linear conduits are alternately arranged in series, the linear conduits having an extension length L,
wherein n is the number of the linear pipelines in the first fluid transmission channel, mu is the viscosity of the fluid, H is the hydraulic diameter of the fluid transmission channel, rho is the density of the fluid, U is the average flow velocity of the fluid, and a is the micro light-emitting diodeSize of (f)LIs the lift coefficient.
10. The micro led transfer device of claim 7, wherein the curved conduits and the linear conduits are alternately arranged in series, and the reynolds number Re of the fluid satisfies:
and Re is more than or equal to 1 and less than or equal to 2000;
where ρ is the fluid density, U is the average flow velocity of the fluid, H is the hydraulic diameter of the fluid transport channel, and μ is the fluid viscosity.
11. The micro led transfer device of claim 7, wherein the curved conduits and the linear conduits are alternately arranged in series, and wherein the forces exerted by the micro leds within the curved conduits include an inertial lift force and a dean drag force, and wherein the ratio R of the inertial lift force to the dean drag force isFThe requirements are met,
and R isF＞0.04；
Wherein a is the size of the micro light-emitting diode, R1The maximum outside bend radius of the curved conduit, H is the hydraulic diameter of the fluid transfer channel.
12. The micro led transfer device of claim 7, further comprising a flow rate regulating pump, wherein the flow rate regulating pump is located at a side of the inlet end away from the fluid delivery pipeline, and the flow rate regulating pump is configured to control a flow rate of the fluid flowing into the inlet end.
13. The micro led transfer device of claim 7, wherein the fluid transport channel has an inner diameter of L1, and the micro led has a size of L2, wherein L2< L1<2 x L2.
14. The micro led transfer device of claim 7, wherein the cross-section of the fluid transport conduit comprises at least one of a rectangle, a square, or a circle.
15. The micro led transfer device of claim 7, further comprising a first magnetic structure for engaging with a second magnetic structure on a side of the receiving substrate.
16. A micro led transfer device according to claim 15, wherein the micro led comprises a first electrode and a second electrode, and the receiving substrate comprises a first substrate electrode and a second substrate electrode;
the first magnetic structure comprises a first sub-magnetic structure and a second sub-magnetic structure, the first sub-magnetic structure is arranged corresponding to the first electrode, the second sub-magnetic structure is arranged corresponding to the second electrode, and the magnetism of the first sub-magnetic structure is opposite to that of the second sub-magnetic structure;
the second magnetic structure comprises a third sub-magnetic structure and a fourth sub-magnetic structure, the third sub-magnetic structure is arranged corresponding to the first substrate electrode, the fourth sub-magnetic structure is arranged corresponding to the second substrate electrode, the third sub-magnetic structure is opposite to the first sub-magnetic structure, and the fourth sub-magnetic structure is opposite to the second sub-magnetic structure; the first sub-magnetic structure is used for being attracted with the third sub-magnetic structure, and the second sub-magnetic structure is used for being attracted with the fourth sub-magnetic structure.
17. A method for transferring micro-leds, which is applied to the micro-led transfer device of any one of claims 7-16, comprising:
controlling the flow of micro light emitting diodes in the fluid transmission channel;
and controlling the micro light-emitting diode to be transferred to the receiving substrate through the hollow part.
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