CN115831041A - Stepped linear array micro LED, scanning device and scanning method - Google Patents
Stepped linear array micro LED, scanning device and scanning method Download PDFInfo
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- CN115831041A CN115831041A CN202310026322.2A CN202310026322A CN115831041A CN 115831041 A CN115831041 A CN 115831041A CN 202310026322 A CN202310026322 A CN 202310026322A CN 115831041 A CN115831041 A CN 115831041A
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Abstract
The invention provides a stepped linear array MicroLED, a scanning device and a scanning method, wherein the stepped linear array MicroLED comprises: the strip-shaped substrate is in a cuboid shape; the method comprises the following steps that multiple groups of MicroLED light-emitting unit groups are arranged in a stepped mode in a first direction on the surface of a strip-shaped substrate, wherein each group of MicroLED light-emitting unit groups comprises M MicroLED light-emitting units, and the M MicroLED light-emitting units in each group are arranged in a straight line in parallel to the first direction; the step-wise arrangement means that the positions of every two adjacent light-emitting unit groups in the second direction of the substrate are different by one step.
Description
Technical Field
The invention relates to the field of semiconductor optical devices, in particular to a stepped linear array micro LED, a scanning device and a scanning method.
Background
The Micro LED display technology is a display technology which takes self-luminous micrometer-scale LEDs as light-emitting pixel units and assembles the light-emitting pixel units on a driving panel to form a high-density LED array. Due to the characteristics of small size, high integration level, self-luminescence and the like of the micro LED chip, compared with an LCD and an OLED, the micro LED chip has the advantages of higher brightness, resolution, contrast, energy consumption, service life, response speed, thermal stability and the like in the aspect of display. However, the conventional miroeld has a problem that a circuit failure is easily caused due to an excessive driving current.
Disclosure of Invention
In order to solve the technical problems, the invention provides a stepped linear array micro LED, a scanning device and a scanning method.
The technical scheme of the invention is as follows: a stepped linear array micro led array, comprising:
the strip-shaped substrate is in a cuboid shape;
the method comprises the following steps that multiple groups of MicroLED light-emitting unit groups are arranged in a stepped mode in a first direction on the surface of a strip-shaped substrate, wherein each group of MicroLED light-emitting unit groups comprises M MicroLED light-emitting units, and the M MicroLED light-emitting units in each group are arranged in a straight line in parallel to the first direction;
the step-wise arrangement means that the positions of every two adjacent light-emitting unit groups in the second direction of the substrate are different by one step;
furthermore, the number of the micro led light emitting unit groups is N, each included light emitting unit is square, the length and the width are both W, and the difference between the positions of every two adjacent micro led light emitting unit groups in the second direction of the substrate is that the step height is W/N, and the position of the next group of micro led light emitting unit groups is higher than the position of the previous group of micro led light emitting unit groups in the second direction by one step height.
Furthermore, each group of the multiple groups of micro led light emitting unit groups is connected to one path of driving unit circuit, that is, each group of micro led light emitting unit groups corresponds to one group of independent driving unit circuit.
Furthermore, the driving unit circuit is used for providing a driving current, and the driving unit circuit drives each micro led light emitting unit in the micro led light emitting unit group to emit light according to the pulse control signal.
Further, in the starting phase, the preset groups in the plurality of micro LED light-emitting unit groups are sequentially lighted.
Further, in a starting stage, a group of independent driving unit circuits corresponding to each group of micro led light emitting unit groups give driving pulse control signals to control the micro led light emitting units in the group of micro led light emitting unit groups to emit light, every time T/N time passes, a next group of adjacent micro led light emitting unit groups in the plurality of micro led light emitting unit groups start to be lightened, until T time, a last group of micro led light emitting unit groups are lightened, and T is scanning time.
According to another aspect of the present invention, a stepped linear array micro led scanning device is provided, which comprises the aforementioned stepped linear array micro led, and,
the scanned assembly and the strip-shaped substrate move relatively in a second direction, and scanning beams emitted by the stepped linear array micro LED irradiate the scanned assembly; the second direction is a direction perpendicular to the first direction.
Furthermore, the relatively moving scanned component is a cylindrical rotating component or a planar component, and the planar component is parallel to the strip-shaped substrate and moves along the second direction in the plane of the planar component.
According to another aspect of the invention, a stepped linear array micro LED scanning method is provided, which comprises the following steps:
setting, namely setting the relative movement speed between the stepped linear array MicroLED and a scanned component;
a driving step, driving the stepped linear array MicroLED and the scanned component to move relatively through a power driving device;
calculating pulse waveform parameters of the pulse control signals based on the relative movement speed and the size information of the MicroLED light-emitting unit;
and a pulse driving step, wherein the driving unit circuit sends out a pulse control signal according to the pulse waveform parameters to drive the micro LED light-emitting unit group to emit light.
Further, the method comprises the following steps:
the multiple groups of micro LED light-emitting units are sequentially lightened under the driving of the pulse control signal, and the linear scanning and the surface scanning are realized along with the relative motion between the stepped linear array micro LED and the scanned component.
Drawings
FIG. 1A: a schematic diagram of a linear array micro led and a relatively moving scanned component of one embodiment;
FIG. 1B: a schematic diagram of a linear array micro led and a relatively moving scanned assembly of yet another embodiment;
FIG. 2: a schematic diagram of pixel smear obtained by scanning a linear array MicroLED;
FIG. 3: a schematic diagram of a stepped linear array MicroLED;
FIG. 4: a driving pulse signal timing diagram;
FIG. 5 is a schematic view of: a pixel distribution schematic diagram obtained by scanning the stepped linear array MicroLED;
FIG. 6: a stepped linear array micro led schematic according to another embodiment;
FIG. 7: a stepped linear array micro led schematic according to yet another embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
According to the embodiment of the invention, the stepped linear array micro LED is provided, and linear array or area array scanning can be performed under low power consumption. Referring to fig. 1A and fig. 1B, which are schematic illustrations of application scenarios of the stepped line array micro led, according to an embodiment of the present invention, a line array micro led 1 is disposed above a scanned component 3, a scanning beam 2 emitted by the line array micro led 1 is irradiated on the scanned component 3, and the scanned component 3 is moved, in an embodiment, for example, in fig. 1A, the scanned component 3 is a rotating cylinder, or, in another embodiment, as shown in fig. 1B, the scanned component 3 is a moving flat plate, that is, the line array micro led 1 and the scanned component 3 keep moving relatively, so that an image of an area array is scanned on the scanned component 3.
Referring to fig. 2, for each light emitting unit on the linear array micro led 1, during the period that the light emitting unit is continuously lighted, as the scanned component 3 moves (the moving direction is shown as the left side), a strip-shaped scanning area is obtained on the scanned component 3, the width of the scanning area is the pixel width W, and the length of the scanning area is related to the scanning time T, the scanning time is related to the lighted time of the micro led, in fact, as the scanning time is prolonged, the length of the scanning area is longer, similar to the phenomenon of smearing, and the pixel area obtained on the scanned component 3 is not square.
Referring to fig. 3, in the embodiment of the present invention, the linear array micro led includes a strip-shaped substrate 4, where the strip-shaped substrate 4 is in a rectangular parallelepiped shape; a plurality of groups of micro led light emitting unit groups 5 are arranged in a stepped manner along the first direction, wherein the first direction is the long side direction (horizontal) of the strip-shaped substrate, the second direction is the short side direction (vertical) of the strip-shaped substrate, each group of micro led light emitting unit groups 5 comprises M micro led light emitting units 51, and the M micro led light emitting units 51 are arranged in a straight line parallel to the first direction and perpendicular to the second direction;
the plurality of light emitting unit groups 5 are arranged in a stepped manner in the first direction, wherein the stepped manner arrangement means that a difference between positions of each adjacent light emitting unit group 5 in the second direction of the substrate is a step 511, and the height of the step 511 of the rear group of micro led light emitting unit groups is higher than that of the front group of micro led light emitting unit groups in the second direction, that is, from left to right, the positions of the groups of micro led light emitting unit groups in the second direction are sequentially raised.
In the embodiment of the present invention, each light emitting unit may be a square, and the length and the width of each light emitting unit are both W, and assuming that a total of N groups of light emitting unit groups 5 are arranged, the size of the step 511 is W/N; n is at least 2, each group is M, and M is, for example, 5 or 10, etc., which is not limited in the present invention;
in one embodiment, comprising 4 light emitting unit groups 5, each comprising 10 light emitting units 51, the step 511 has a length of W/4. Or in another embodiment, comprising 5 light emitting unit groups 5, each comprising 20 light emitting units, the height dimension of the step 511 is W/5.
According to the embodiment of the invention, each group of the micro LED light-emitting unit groups is connected to one driving unit circuit, and each group of the micro LED light-emitting unit groups corresponds to one driving unit circuit.
The driving unit circuit is used for providing driving current and driving the MicroLED light-emitting unit to emit light according to the pulse control signal; the number N of pulses of the driving current in the time T corresponds to the number of the light emitting unit groups, and the ith light emitting unit group is correspondingly lightened in the pulse time Ti/N; for example, suppose there are 4 light emitting unit groups 5 arranged in a ladder, see fig. 4, which is a schematic diagram of pulse control signals of a driving unit circuit, wherein 4 pulse signals respectively drive the corresponding 4 light emitting unit groups to emit light, wherein the 1 st light emitting unit is turned on and the other light emitting units are turned off within a pulse time of 0 to T/4, the 2 nd light emitting unit is turned on and the other light emitting units are turned off within a pulse time of T/4 to 2t/4, the 3 rd light emitting unit is turned on and the other light emitting units are turned off within a pulse time of 2T/4 to 3t/4, and the 4 th light emitting unit is turned on and the other light emitting units are turned off within a pulse time of 3T/4 to T; meanwhile, during the time T, the distance moved by the scanned unit in the second direction is W;
based on the embodiment of the invention, in the starting stage, the preset unit groups in the plurality of micro LED light-emitting unit groups are sequentially lightened, and not all the micro LED light-emitting unit groups on all the linear arrays are lightened simultaneously, so that the driving current can be greatly reduced, for example, the driving current is reduced to 1/N of the original driving current, the circuit is safer and more stable, and the wiring width and the area of the driving circuit on a silicon chip can be reduced because large driving current is not needed.
In a starting stage, a group of independent driving unit circuits corresponding to each group of micro led light emitting unit groups give driving pulse control signals, a first group of micro led light emitting units in the N groups of micro led light emitting unit groups are controlled to emit light, every time T/N passes, a next adjacent light emitting unit group in the micro led light emitting unit groups starts to be lighted, and until T time, a last micro led light emitting unit group is lighted, so that scanned equipment is sequentially scanned, and since each group of micro led light emitting unit groups is only lighted for T/N during the time, scanned pixels have no smear, as shown in fig. 5, the size of the scanned pixels in the longitudinal direction is H, the size of H is equal to the pixel height W plus W/N, and the total scanned equipment only moves by (N + 1/N) × W pixel units, so that the smear length is shortened.
According to another aspect of the present invention, a stepped linear array micro led scanning device is provided, comprising the aforementioned stepped linear array micro led, and,
the scanned assembly and the strip-shaped substrate move relatively in a second direction, and scanning beams emitted by the stepped linear array micro LED irradiate the scanned assembly; the second direction is a direction perpendicular to the first direction.
The relatively moving scanned component is a cylindrical rotary motion component or a plane shape, and the plane is parallel to the substrate and moves along a second direction in the plane.
According to another embodiment of the invention, a stepped linear array micro led scanning method is further provided, including:
setting, namely setting the relative movement speed between the driving stepped linear array MicroLED and a scanned component; the movement speed satisfies v = W/T;
a driving step, driving the stepped linear array MicroLED and the scanned component to move relatively through a power driving device; the movement speed moves according to the speed set in the previous step;
calculating, namely calculating pulse waveform parameters of a pulse circuit based on the parameters of the motion and size information of the MicroLED light-emitting unit;
the number of the pulses is equal to the number N of the light-emitting unit groups, the period of each of the N pulse waveforms is T/N, and a plurality of pulse signals are sequentially generated by taking the T/N as the period; compared with a larger instantaneous driving current required by driving a whole row of light-emitting units at a time by using a single pulse, the instantaneous driving current can be reduced and the duty ratio of the pulse waveform can be increased by sequentially driving each group of light-emitting unit groups by N pulses, for example, if a 500mA current is required for instantaneously driving a whole row of MicroLED light-emitting units (assuming that the duration is the pulse width of 1 second), the instantaneous current can be reduced to 1/N, such as 100mA or 125mA, but is divided into 200ms or 250ms duration pulses by the method of the invention;
and a pulse driving step, wherein a driving unit circuit sends out a pulse control signal according to the pulse waveform parameters to drive M light-emitting units 51 in a preset MicroLED light-emitting unit group to emit light simultaneously, wherein the duration time of light emission of each light-emitting unit group is within T/N.
Furthermore, the plurality of micro LED light-emitting unit groups are sequentially lightened under the driving of the pulse waveform control signal, and the linear scanning and the surface scanning are realized along with the relative motion between the stepped linear array micro LED and the scanned component.
In the invention, the linear array micro LEDs and the scanned component move relatively, each group of micro LED light-emitting unit groups are sequentially lightened in a T time, and each part (N parts) of one row of pixels is sequentially scanned in the relative movement process of the scanned component, so that complete linear scanning of one row can be completed in the T time.
According to another embodiment of the present invention, as shown in fig. 6, the stepped line array micro led includes a plurality of sets of light emitting units with different lengths, wherein the number of light emitting units included in each set of light emitting units is different, so as to form the sets of light emitting units with different lengths, as shown in fig. 6, a first set 53 of light emitting units includes 3 light emitting units, a second set 54 of light emitting units includes 7 light emitting units, a third set of light emitting units includes 3 light emitting units, which are the same as the first set, and a fourth set of light emitting units includes 7 light emitting units, which are the same as the third set, so that the length of the step 511 is still W/4. When the stepped linear array micro LED is driven, the pulse sequence is the same as before, but the driving units corresponding to each group of light emitting unit groups are different, the driving rated current of each group of driving unit circuit is related to the number of the corresponding light emitting units, so that the number of the short light emitting unit groups can be reduced under the condition of meeting the driving capability, for example, the current driving capability of a part of driving circuits is required to be 800mA instead of 500mA before, and the rest part can be arranged to be 300mA and the like;
in yet another embodiment, as shown in fig. 7, the stepped line array micro led includes a plurality of light emitting unit groups with different lengths, wherein the number of light emitting units included in each light emitting unit group is different, thereby forming light emitting unit groups 5 with different lengths, specifically, the light emitting unit groups 53 on both sides are shorter, and the light emitting unit group 55 in the center is longer, as shown in fig. 7, the first light emitting unit group 53 includes 3 light emitting units, the second light emitting unit group 55 includes 17 light emitting units, and the third light emitting unit group 53 includes 3 light emitting units, which is the same as the first group, and the length of the step 511 is W/3.
When the stepped linear array micro LED is driven, the pulse time sequence is similar to that before, but the driving rated current of the middle second group driving unit circuit needs to be enhanced to meet the requirement of driving a large number of light-emitting units.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.
Claims (10)
1. A stepped linear array MicroLED, comprising:
the strip-shaped substrate is in a cuboid shape;
the method comprises the following steps that multiple groups of MicroLED light-emitting unit groups are arranged in a stepped mode in a first direction on the surface of a strip-shaped substrate, wherein each group of MicroLED light-emitting unit groups comprises M MicroLED light-emitting units, and the M MicroLED light-emitting units in each group are arranged in a straight line in parallel to the first direction;
the step-wise arrangement means that the positions of every two adjacent light-emitting unit groups in the second direction of the substrate are different by one step.
2. The stepped linear array MicroLED of claim 1, wherein,
the number of the micro LED light-emitting unit groups is N, each included light-emitting unit is square, the length and the width of each included light-emitting unit are W, the difference of the positions of every two adjacent micro LED light-emitting unit groups in the second direction of the substrate is that the step height size is W/N, and the position of the next group of micro LED light-emitting unit groups is higher than that of the previous group of micro LED light-emitting unit groups in the second direction by one step height.
3. The stepped linear array micro led of claim 1, wherein each of the plurality of groups of micro led light emitting units is connected to a driving unit circuit, i.e. each group of micro led light emitting units corresponds to a separate driving unit circuit.
4. The stepped linear array MicroLED as recited in claim 3, wherein said driving unit circuit is configured to provide a driving current, and said driving unit circuit drives each MicroLED light emitting unit of the group of MicroLED light emitting units to emit light according to a pulse control signal.
5. The stepped linear array micro led of claim 1, wherein, during a start-up phase, predetermined ones of the plurality of groups of micro led light emitting units are sequentially illuminated.
6. The stepped linear array micro LED according to claim 1, wherein in a start-up phase, a group of independent driving unit circuits corresponding to each group of micro LED light emitting unit groups gives a driving pulse control signal to control the micro LED light emitting units in the group of micro LED light emitting unit groups to emit light, every T/N time, a next group of adjacent micro LED light emitting unit groups in the plurality of micro LED light emitting unit groups starts to be lighted up, until T, a last group of micro LED light emitting unit groups is lighted up, and T is scanning time.
7. A stepped linear array MicroLED scanning device, comprising the stepped linear array MicroLED of any one of claims 1 to 6, and,
the scanned assembly and the strip-shaped substrate move relatively in a second direction, and scanning beams emitted by the stepped linear array micro LED irradiate the scanned assembly; the second direction is a direction perpendicular to the first direction.
8. The stepped linear array micro led scanning device as recited in claim 7, wherein said relatively moving scanned component is a cylindrical rotary motion component or a planar shape, said planar shape being parallel to the strip substrate and moving in the second direction within the plane of its planar shape.
9. A stepped line array micro led scanning method using the scanning device as claimed in any one of claims 7 to 8, comprising:
setting, namely setting the relative movement speed between the stepped linear array MicroLED and a scanned component;
a driving step, driving the stepped linear array MicroLED and the scanned component to move relatively through a power driving device;
calculating pulse waveform parameters of the pulse control signals based on the relative movement speed and the size information of the MicroLED light-emitting unit;
and a pulse driving step, wherein the driving unit circuit sends out a pulse control signal according to the pulse waveform parameters to drive the micro LED light-emitting unit group to emit light.
10. The stepped linear array micro LED scanning method of claim 9, comprising:
the multiple groups of micro LED light-emitting units are sequentially lightened under the driving of the pulse control signal, and the linear scanning and the surface scanning are realized along with the relative motion between the stepped linear array micro LED and the scanned component.
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