A scanning method based on Micro-LED linear array light source

Abstract

The present invention relates to the field of micro-display scanning technology, and discloses a scanning method based on a Micro-LED linear array light source, comprising the following steps: step S1, making the linear array light source and the scanned object start relative motion; step S2, lighting the first row of pixels of the linear array light source at the first moment, and maintaining a predetermined time length T1; step S3, extinguishing the first row of pixels at the second moment, and lighting the second row of pixels of the linear array light source, and maintaining a predetermined time length T1; step S4, extinguishing the n-1th row of pixels at the nth moment, and lighting the nth row of pixels of the linear array light source, and maintaining a predetermined time length T1, until n equals N, completing the exposure of the first entire row of pixel areas, and N is the number of pixel rows of the linear array light source. The scanning method of the present invention can simplify the scanning control process. During the scanning process, each row of pixels in the Micro-LED linear array light source is lit in time, which can reduce the total power supply of the linear array light source at any moment, and each row of pixels is kept lit with sufficient power, and the scanning pixel clarity is high.

Description

Technical Field

[0001] The present invention relates to the field of micro-display scanning technology, and in particular to a scanning method based on a Micro-LED linear array light source. Background Art

[0002] The emergence of 3D printing technology has made the processing of various complex parts in industry easier and greatly improved efficiency. Existing 3D printing methods include fused deposition modeling (FDM), laser solidification modeling (SLA / DLP), powder hot melt modeling (SLS / SLM), electron beam melting modeling (EBM), etc. For example, FDM printers build objects by heating plastic filaments to the melting point and depositing them layer by layer, while SLA printers use ultraviolet lasers to solidify liquid resins to build objects layer by layer. In SLA printing technology, traditional ultraviolet (UV) light sources have many disadvantages: mercury lamps have inaccurate energy distribution, high heat generation, mercury-containing and environmentally unfriendly, short lifespan and need to be replaced frequently; excimer laser equipment is expensive, large in size and difficult to maintain. In addition, if the existing light source is to increase the exposure, there is a problem of excessive power supply current and there will be smearing. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a scanning method based on a Micro-LED linear array light source. The light source used is a Micro-LED linear array light source, which has a simple structure and low cost, can simplify the scanning control process, and each row of pixels in the Micro-LED linear array light source is powered by time-sharing, the total power and current will not be too large at the same time, and each row is kept lit with sufficient power, the total exposure is sufficient, and the scanning pixel clarity is high, comprising the following steps:

[0004] Step S1, making the linear array light source and the scanned object start relative motion;

[0005] Step S2, lighting up the first row of pixels of the linear array light source at a first moment, and maintaining the lighting for a predetermined time length T1;

[0006] Step S3, turning off the first row of pixels at the second moment, and lighting up the second row of pixels of the linear array light source for a predetermined time length T1;

[0007] Step S4, at the nth time, turn off the n-1th row of pixels, and light up the nth row of pixels of the linear array light source, and keep it for a predetermined time length T1 until n equals N, completing the exposure of the first entire row of pixel areas, where N is the number of pixel rows of the linear array light source.

[0008] The linear array light source comprises N rows of linear array unit groups, which are the first row, the second row, ... the Nth row in sequence, each row of linear array unit groups comprises a plurality of pixel point light sources, each row of linear array unit groups is spaced apart and distributed in an area with a longitudinal width of h, the upper edge of the image of the first row is flush with the upper edge of the area, wherein the distance between the upper edge of the nth row of linear array unit groups and the upper edge of the n-1th row of position division rows is dn, n is the number of rows, and n>1, the calculation of dn comprises two parts, the first part is the width of the position division row, and the second part is the accumulated offset distance,

[0009] ,

[0010] The position split line width is p:

[0011] ,

[0012] h is the longitudinal width of the linear array light source, and N is the total number of rows of the linear array unit group.

[0013] Through the above position setting, the present invention enables exposure connection to be performed in different positions in sequence through gradual movement of the linear array light source, thereby completing the exposure of a whole row of complete pixel areas.

[0014] Furthermore, the step S2, lighting up the first row of pixels of the linear array light source at the first moment and maintaining the lighting for a predetermined time length T1, is specifically:

[0015] At the first moment, the first row of linear array unit groups of the linear array light source is lit, and the other rows of linear array unit groups are kept off.

[0016] At the first moment, only the first row of linear array unit groups of the linear array light source is lit, so only the first row of pixels is exposed, and the other rows of linear array unit groups are kept off, which can reduce the overall power consumption.

[0017] Furthermore, the step S1, making the linear array light source and the scanned object start relative motion, includes two situations: the linear array light source remains stationary and the scanned object moves at a speed v; or the linear array light source moves at a speed v and the scanned object remains stationary. In the present invention, since the linear array light source and the scanned object perform relative motion, it is possible to move the linear array light source or the scanned object, as long as the relative motion speed is kept at v.

[0018] Furthermore, the light emitted by the linear array light source is irradiated to the scanned area of ​​the scanned object, the pixel width of the scanned area is dpix, and the time for scanning one pixel is:

[0019] ,

[0020] The above scanning time is calculated according to the width of the position division row. In the present invention, the position division row is divided into N parts. Since the linear array light source moves as a whole, when the complete scan of the position division row is completed, the entire row of pixels is also scanned. In addition, due to the aforementioned position setting method, that is, the linear array unit groups in each row are staggered by a set distance, each scan can be completely connected.

[0021] Among them, the predetermined time length T1 is maintained:

[0022] T1=T / N,

[0023] During this predetermined holding time, the pixels are lit for exposure.

[0024] Furthermore, in step S2, the first row of pixels of the linear array light source is lit at a first moment, and the power of the first row of pixels is maintained at P within a predetermined time length T1.

[0025] Furthermore, in step S3, at the second moment, the first row of pixels is turned off, and the second row of pixels of the linear array light source is turned on for a predetermined time length T1, wherein the power of turning on the second row of pixels of the linear array light source is P.

[0026] Furthermore, after step S4, the method further includes step S5: repeating steps S2-S4 to scan the next row of pixels.

[0027] In the present invention, after step S4, the linear array light source can be moved as a whole to the next position. Specifically, the next position makes the upper edge of the first row of linear array unit groups of pixel light sources be h away from the position of the last scanned line 0; that is, the linear array light source as a whole moves a distance h relative to the position at the last S1 moment, so as to align to the position to be scanned next time, and prepare to scan the next row of pixels. In the above embodiment, after scanning 4 rows of pixels, the scanning of a whole row of pixels is completed, that is, the scanning of each row of pixels only completes a part of a whole row of pixels.

[0028] In the embodiment of the present invention, the virtual position segmentation row is actually divided into N parts, and each time it is moved 1 / N, so that the following pixels are aligned to a sub-row in turn, so that the scanning of a whole pixel is completed after N times of movement. Further, the direction in which the linear array light source and the scanned object start to move relative to each other is: along the direction from the Nth row of pixels to the first row of pixels.

[0029] Furthermore, in step S4, the nth moment refers to the time n T1 moment.

[0030] The scanning method of the present invention can simplify the scanning control process, and each row of pixels is lit with sufficient power, and the scanning pixel clarity is high, which means that in the 3D printing process, the resin can be cured more accurately, and pixel blur and distortion can be reduced, thereby improving the printing quality and accuracy. In addition, in the present invention, during the scanning process, each row of pixels in the Micro-LED linear array light source is lit in time, which can reduce the total power and current of the linear array light source at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the linear array light source structure of the present invention;

[0032] Figure 2 This is a schematic diagram of each area of ​​a pixel scanned by a linear array light source of the present invention;

[0033] Figure 3 This is a timing diagram of lighting up the linear array light source of the present invention;

[0034] Figure 4 It is a schematic diagram of the scanning energy of the linear array light source of the present invention. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0036] According to an embodiment of the present invention, a scanning method based on a Micro-LED linear array light source is proposed, comprising the following steps:

[0037] Step S1, making the linear array light source and the scanned object start relative motion;

[0038] Step S2, lighting up the first row of pixels of the linear array light source at a first moment, and maintaining the lighting for a predetermined time length T1;

[0039] Step S3, at the second moment, turn off the first row of pixels, and light up the second row of pixels of the linear array light source for a predetermined time length T1;

[0040] Step S4, at the nth time, turn off the n-1th row of pixels, and light up the nth row of pixels of the linear array light source, and keep it for a predetermined time length T1 until n is equal to N, and complete the exposure of a whole row of pixels, wherein N is the number of pixel rows of the linear array light source. In the present invention, the first row of pixels, the second row of pixels, ... the Nth row of pixels of the linear array light source constitute a whole row of pixels, that is, a whole row of pixels includes a plurality of sub-rows of pixels, and the first row of pixels, the second row of pixels, etc. are equivalent to sub-row pixels.

[0041] In the scanning process of the method of the present invention, the linear array light source and the scanned object move relative to each other. When the linear array light source starts scanning, the first row of pixels is exposed first. As the relative movement proceeds, in order to achieve seamless exposure of the entire row of pixel areas, each subsequent row of pixels needs to be lit up in sequence at a specific position. The setting of the distance dn between the upper edge of the nth row of linear array unit groups and the upper edge of the n-1th row of position dividing rows ensures that during the scanning process, each row of pixels can be accurately aligned with the corresponding position of the scanned area.

[0042] For example, assuming that the scanned object moves from bottom to top at a speed of V (corresponding to the scanning direction from the Nth row of pixels to the first row of pixels), after the first row of pixels is exposed, after a certain period of relative movement, when the upper edge of the nth row of linear array unit groups reaches the lower edge position of the scanned area when the exposure of the n-1th row of pixels is completed, the nth row of pixels begins to light up, thereby ensuring the continuity of the scan.

[0043] like Figure 1 As shown, the linear array light source includes N rows of linear array unit groups, which are the first row α, the second row β, the third row γ, the fourth row δ ... the Nth row, each row of linear array unit groups includes a plurality of pixel point light sources, and each row of linear array unit groups is spaced apart, and the N rows of linear array unit groups are distributed in an area with a longitudinal width of h, such as Figure 1 As shown, the topmost 0 line is the upper edge of the linear array light source, that is, the upper edge of the region, the first row of pixels, that is, the upper edge of the first row of linear array unit groups is flush with the 0 line of the upper edge of the region, the distance between the upper edge of the nth row of linear array unit groups and the upper edge of the n-1th row of linear array unit groups is dn, for example, the distance between the upper edge of the second row of linear array unit groups and the upper edge of the first position division row above it is d2; the distance between the upper edge of the third row of linear array unit groups and the upper edge of the second position division row above it is d3; n is the number of rows, and n≥1, the calculation of dn includes two parts, the first part is the position division row width, and the second part is the accumulated offset distance:

[0044] ,

[0045] Among them, p is the position segmentation line width, is the cumulative offset distance, which is the distance between the upper edge of the n-th row of linear array unit groups and the lower edge of the n-1-th row of position division rows;

[0046] The above position segmentation line width p is:

[0047] ,

[0048] h is the longitudinal width of the linear array light source, and N is the total number of rows of the linear array unit group. For example, in this embodiment, assuming n=1, h=80 , p is the width of the position segmentation line in the region, p = h / (N) = 100 / 4 = 20 , N is 4, there are 4 rows of pixels, and the corresponding bus array unit group has 4 rows; as shown in the figure, for N=4, there are 4 position segmentation rows; each pixel width is 20 When N=6, there are 6 positional separation lines; when N=10, there are 10 positional separation lines.

[0049] The above-mentioned cumulative offset distance refers to the distance between the upper edge of the current linear array unit group and the nearest position splitting line (lower edge) above it. For example, the distance between the second row of linear array unit groups and the nearest position splitting line above it is 1p / 4, which is 5 , the distance between the third row of linear array units and the nearest position split row above it is 2p / 4, which is 10 It should be noted that the position division row refers to a virtual row for arranging the above-mentioned rows of linear array unit groups, and the position division row divides the area with a longitudinal width of h into N parts on average to form a plurality of position division rows;

[0050] Then for the first row of pixels, which is flush with the 0 line, the above formula can be ignored;

[0051] For the second row of linear array unit groups, the distance between them and the upper edge of the first row of position division lines (i.e., line 0) is: the width of the position division line plus the accumulated offset distance of the second row, which is 20+5=25 ;

[0052] d2=20+(2-1) 20 / 4=25, where the width of the position segmentation line is 20, the cumulative offset distance is 5, and d2 is 25 .

[0053] For the third row of linear array unit groups, the distance between them and the upper edge of the second position division row is: the position division row width plus the cumulative offset distance of the third row is 20+10=30 ;

[0054] And so on for other rows;

[0055] Furthermore, the step S2, lighting up the first row of pixels of the linear array light source at the first moment and maintaining the predetermined time length T1 is specifically:

[0056] At the first moment, the first row of linear array unit groups of the linear array light source is lit, and the other rows of linear array unit groups are kept off.

[0057] Furthermore, the step S1, making the linear array light source and the scanned object start relative movement, includes two situations: the linear array light source remains stationary and the scanned object moves at a speed v; or the linear array light source moves at a speed v and the scanned object remains stationary.

[0058] Furthermore, the light emitted by the linear array light source is irradiated to the scanned area of ​​the scanned object, the width of the scanned pixel area is dpix, and the time for scanning one pixel area is:

[0059] ,

[0060] Maintain the predetermined time length T1:

[0061] ,

[0062] For example, suppose the scanned pixel width is 800 , speed v=100 / s, then T=2s, and the preset time length is T1=2 / 4=0.5s; assuming the scanned pixel width is 400 , speed v=100 / s, then T=1s, maintain the predetermined time length T1=1 / 4=0.25s;

[0063] Furthermore, in step S2, the first row of pixels of the linear array light source is lit at a first moment, and the power of the first row of pixels is maintained at P within a predetermined time length T1.

[0064] Furthermore, in step S3, at the second moment, the first row of pixels is turned off, and the second row of pixels of the linear array light source is turned on for a predetermined time length T1, wherein the power of turning on the second row of pixels of the linear array light source is P.

[0065] See also Figure 2-3 , Figure 2 In the figure, the ordinate is the number of scanned lines after pixel segmentation, and the abscissa is time. The pixel width dpix is ​​scanned in 4 lines. At T / 4, the first line of linear array units α is aligned with the upper edge 0 line of the first line of sub-pixel area of ​​the pixel. The linear array light source and the scanned object keep relative motion. After T / 4, the linear array light source moves up by 1 / 4 p, so that at the moment of 2T / 4, the second row of linear array units β is aligned with the second row of sub-pixel regions, and after 2T / 4, and so on, each row of linear array units is aligned with each sub-pixel region in turn, thereby completing the pixel scanning. Figure 3As shown, in the 1T / 4 time period, the first row of linear array units α are lit with a power of P, in the 2T / 4 time period, the second row of linear array units β are lit with a power of P, in the 3T / 4 time period, the third row of linear array units γ are lit with a power of P, and in the 4T / 4 time period, the fourth row of linear array units δ are lit with a power of P. It can be seen that when scanning each line, the linear array pixels can be lit with sufficient power P, so that the scanning exposure is sufficient and the effect is clearer.

[0066] Furthermore, after step S4, step S5 is also included: repeating steps S2-S4 to scan the next row of pixels. When scanning the next pixel, repeat the above steps, and use each row of linear array pixel unit groups to scan the exposure pixel sub-region positions in turn to achieve pixel exposure. In the present invention, after step S4, the linear array light source can be moved as a whole to the next position. Specifically, the next position makes the upper edge of the first row of linear array unit groups of the pixel light source be h away from the last scanned 0 line position; that is, the linear array light source as a whole moves a distance h relative to the position at the last S1 moment, so as to align with the position to be scanned next time, and prepare to scan the next row of pixels. In the above embodiment, after scanning 4 rows of pixels, the scanning of a whole row of pixels is completed, that is, the scanning of each row of pixels only completes a part of a whole row of pixels.

[0067] In the embodiment of the present invention, the virtual position division row is actually divided into N parts, and 1 / N is moved each time, so that the following pixels are aligned to a sub-row in turn, and the scanning of an entire pixel is completed after N moves.

[0068] Furthermore, the direction in which the linear array light source and the scanned object start to move relative to each other is along the direction from the Nth row of pixels to the first row of pixels. Figure 2 As shown in , the linear array light source can be seen moving forward.

[0069] In step S4, the nth moment refers to the time n T1 moment.

[0070] like Figure 4 As shown, in this embodiment, the present invention lights up 4 rows of pixels in time-sharing manner, so that at any time, the energy E required to drive the linear array light source is e1 as shown in the figure, and the value is E. Relatively speaking, at any time, if all 4 rows of pixels are lit up, the energy required is as shown in the curve e2, and the value is 4 times that of the time-sharing lighting, that is, 4E. It can be seen that the value of the energy e1 required for the time-sharing lighting of the present invention is only 1 / 4 of the energy e2 required for full lighting. The present invention greatly reduces the energy required to be provided instantaneously, thereby reducing the instantaneous power consumption and power supply requirements of the IC.

[0071] Although the above describes the illustrative specific embodiments of the present invention to facilitate those skilled in the art to understand the present invention, and it should be clear that the present invention is not limited to the scope of the specific embodiments, for those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A scanning method based on Micro-LED linear array light source, characterized in that The steps include: Step S1, making the linear array light source and the scanned object start relative motion; Step S2, lighting up the first row of pixels of the linear array light source at a first moment, and maintaining the lighting for a predetermined time length T1; Step S3, turning off the first row of pixels at the second moment, and lighting up the second row of pixels of the linear array light source for a predetermined time length T1; Step S4, at the nth time, turn off the pixels in the n-1th row, and light up the pixels in the nth row of the linear array light source, and keep it for a predetermined time length T1 until n equals N, and the first entire row of pixel area exposure is completed, where N is the number of pixel rows of the linear array light source; The first row of pixels, the second row of pixels ... the Nth row of pixels of the linear array light source constitute a whole row of pixels, that is, a whole row of pixels includes a plurality of sub-rows of pixels, and the first row of pixels and the second row of pixels are equivalent to sub-rows of pixels; The linear array light source comprises N rows of linear array unit groups, which are the first row, the second row, ... the Nth row in sequence, each row of linear array unit groups comprises a plurality of pixel point light sources, each row of linear array unit groups is spaced apart and distributed in an area with a longitudinal width of h, the upper edge of the pixels in the first row is flush with the upper edge of the area, wherein the distance between the upper edge of the nth row of linear array unit groups and the upper edge of the n-1th row of position division rows is dn, n is the number of rows, and n>1, the calculation of dn comprises two parts, the first part is the width of the position division row, and the second part is the accumulated offset distance, ， The position split line width is p: ， h is the longitudinal width of the linear array light source, and N is the total number of rows of the linear array unit group.

2. The scanning method based on Micro-LED linear array light source according to claim 1, characterized in that: The step S2, lighting up the first row of pixels of the linear array light source at a first moment and maintaining the lighting for a predetermined time length T1, specifically includes: At a first moment, the first row of linear array unit groups of the linear array light source is lit, and the other rows of linear array unit groups are kept off.

3. The scanning method based on Micro-LED linear array light source according to claim 1, characterized in that: The step S1, making the linear array light source and the scanned object start relative movement, includes two situations: the linear array light source remains stationary and the scanned object moves at a speed v; or the linear array light source moves at a speed v and the scanned object remains stationary.

4. The scanning method based on Micro-LED linear array light source according to claim 3, characterized in that: The light emitted by the linear array light source is irradiated to the scanned area of ​​the scanned object. The pixel width of the scanned area is dpix. The time to scan one pixel is: ， The predetermined time length T1 is maintained as: 。 5. The scanning method based on Micro-LED linear array light source according to claim 2, characterized in that: The step S2 is to light up the first row of pixels of the linear array light source at a first moment, and keep the power of the first row of pixels at P for a predetermined time length T1.

6. The scanning method based on Micro-LED linear array light source according to claim 3, characterized in that: The step S3 is to turn off the first row of pixels at the second moment, and light up the second row of pixels of the linear array light source for a predetermined time length T1, wherein the power of lighting up the second row of pixels of the linear array light source is P.

7. The scanning method based on Micro-LED linear array light source according to claim 1, characterized in that: After step S4, the method further includes step S5: repeating steps S2-S4 to scan the next row of pixels.

8. The scanning method based on Micro-LED linear array light source according to claim 3, characterized in that: The direction in which the linear array light source and the scanned object start to move relative to each other is along the direction from the Nth row of pixels to the first row of pixels.

9. The scanning method based on Micro-LED linear array light source according to claim 3, characterized in that: In step S4, the nth moment refers to the time n T1 moment.

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