CN-116433961-B - PCB ink color classification method, device and system of Micro-LED

CN116433961BCN 116433961 BCN116433961 BCN 116433961BCN-116433961-B

Abstract

The embodiment of the invention discloses a PCB ink color classification method, device and system of Micro-LEDs. The method comprises the steps of obtaining target printed circuit boards to be classified, acquiring target circuit board images acquired under the irradiation of a linear light source, carrying out region division on the target circuit board images to obtain a plurality of target region images corresponding to the target printed circuit boards, determining first reflectivity corresponding to each target region image based on standard light source information of the linear light source, determining second reflectivity and extremely poor target reflectivity corresponding to the target printed circuit boards based on the first reflectivity, carrying out ink classification based on the second reflectivity, the extremely poor target reflectivity and a preset reflectivity change range corresponding to each ink category, and determining the target ink category corresponding to the target printed circuit boards, so that ink color classification of the printed circuit boards is realized, the consistency of the assembled printed circuit boards is guaranteed, further, the difference of ink color effects is avoided, and the display quality of a display screen is improved.

Inventors

ZHOU GUOHUA
HONG RONGHUI
FU NINGSHENG
XIE JIAN
ZHANG SHUANGYI
GUO HAIMIN
ZHANG YING

Assignees

厦门强力巨彩光电科技有限公司

Dates

Publication Date: 20260508
Application Date: 20230316

Claims (8)

1. A method for classifying ink colors of PCBs of Micro-LEDs, the method comprising: acquiring a target printed circuit board image acquired under the irradiation of a linear light source of a target printed circuit board to be classified; performing region division on the target circuit board image to obtain a plurality of target region images corresponding to the target printed circuit board; Determining an ink reflection value corresponding to each target area image, determining a ratio between the ink reflection value and a standard reflection value, multiplying the ratio by the standard reflection value to obtain a multiplication result, and determining the multiplication result as a first reflection rate corresponding to the target area image, wherein the ink reflection value is a light intensity reflection value reflected by a target printed circuit board ink area corresponding to the target area image based on a preset linear light source, and the standard light source information of the linear light source comprises the standard reflection rate and the standard reflection value of the linear light source, wherein the first reflection rate is the reflection rate of the area where the target area image is located in the target printed circuit board; the method comprises the steps of carrying out average processing on all first reflectivities corresponding to a target printed circuit board, and obtaining average reflectivities serving as second reflectivities corresponding to the target printed circuit board, determining the maximum reflectivities and the minimum reflectivities in all first reflectivities corresponding to the target printed circuit board, and determining the difference between the maximum reflectivities and the minimum reflectivities as the target extremely poor reflectivities corresponding to the target printed circuit board; Performing ink color classification based on the second reflectivity, the extremely poor target reflectivity and a preset reflectivity change range corresponding to each ink color type, and determining a target ink color type corresponding to the target printed circuit board, wherein the printed circuit board corresponding to the preset reflectivity change range has ink color consistency; the ink color classification based on the second reflectivity, the target reflectivity being extremely poor and the preset reflectivity variation range corresponding to each ink color category, and the determining the target ink color category corresponding to the target printed circuit board comprises the following steps: And determining the ink color category of which the second reflectivity is in the range of the reflectivity variation of the circuit board and the target reflectivity is in the range of the reflectivity variation as the target ink color category corresponding to the target printed circuit board, wherein the preset reflectivity variation range comprises the range of the reflectivity variation of the circuit board and the range of the reflectivity variation.
2. The method of claim 1, wherein the performing region division on the target circuit board image to obtain a plurality of target region images corresponding to the target printed circuit board comprises: dividing the region of the target circuit board image to obtain a plurality of divided image regions to be processed; and removing the copper foil and the peripheral area in each image area to be processed to obtain a removed target area image.
3. The method of claim 1, wherein the acquiring the target circuit board image acquired by the target printed circuit board to be classified under the irradiation of the linear light source comprises: Generating a grabbing signal corresponding to the target printed circuit board, and sending the grabbing signal to a first manipulator, so that the first manipulator places the target printed circuit board in a first area on an objective table in a preset initial position based on the grabbing signal; When the target printed circuit board is detected to be placed on the objective table, controlling the objective table to slide from a preset initial position to a preset end position along a linear guide rail, and controlling an image acquisition end to acquire an image of the target printed circuit board under the irradiation of a linear light source; and acquiring the target circuit board image acquired by the image acquisition end.
4. The method of claim 3, wherein the image acquisition end is a spectroradiometer acquisition end, and the linear light source is located above the linear guide rail.
5. The method of claim 3, further comprising, after determining the target ink category corresponding to the target printed circuit board: Determining a target area corresponding to the target printed circuit board based on the target ink category; And generating a board taking signal corresponding to the target printed circuit board based on the target area, and sending the board taking signal to a second manipulator, so that the second manipulator places the target printed circuit board on an objective table to the target area based on the board taking signal.
6. The method of any one of claims 1-5, further comprising, after determining the target ink category corresponding to the target printed circuit board: selecting a preset number of printed circuit boards from the printed circuit boards with the same ink color type; And processing and assembling the printed circuit boards with the preset number to obtain the assembled display screen.
7. A PCB ink sorting apparatus of Micro-LEDs, the apparatus comprising: the target circuit board image acquisition module is used for acquiring target circuit board images acquired by the target printed circuit board to be classified under the irradiation of the linear light source; The target area image determining module is used for carrying out area division on the target circuit board image to obtain a plurality of target area images corresponding to the target printed circuit board; The first reflectivity determining module is used for determining a first reflectivity corresponding to each target area image based on standard light source information of the linear light source and determining a second reflectivity corresponding to the target printed circuit board and a target reflectivity extremely poor based on the first reflectivity; The target ink color category determining module is used for classifying the ink colors based on the second reflectivity, the extremely poor target reflectivity and a preset reflectivity change range corresponding to each ink color category, and determining the target ink color category corresponding to the target printed circuit board, wherein the printed circuit board corresponding to the preset reflectivity change range has ink color consistency; the first reflectivity determining module is specifically configured to determine an ink reflectivity value corresponding to each target area image based on each target area image, determine a ratio between the ink reflectivity value and a standard reflectivity value, multiply the ratio with the standard reflectivity to obtain a multiplication result, and determine the multiplication result as a first reflectivity corresponding to the target area image, wherein the ink reflectivity value is a light intensity reflectivity value reflected by an ink area of a target printed circuit board corresponding to the target area image based on a preset linear light source, and the standard light source information of the linear light source comprises a standard reflectivity and a standard reflectivity value of the linear light source, wherein the first reflectivity is a reflectivity of an area where the target area image is located in the target printed circuit board; The target ink color category determining module is specifically configured to determine that the second reflectivity is in a range of variation of reflectivity of the circuit board, and the ink color category of which the target reflectivity is in the range of variation of the reflectivity range is a target ink color category corresponding to the target printed circuit board, where the preset reflectivity range includes the range of variation of reflectivity of the circuit board and the range of variation of the reflectivity range.
8. A PCB ink color classification system of Micro-LEDs is characterized by comprising an image acquisition end, a linear light source and a controller, wherein, The acquisition end is used for acquiring a target circuit board image of the target printed circuit board under the irradiation of the linear light source; The controller is used for realizing the PCB ink color classification method of the Micro-LED according to any one of claims 1 to 6.

Description

PCB ink color classification method, device and system of Micro-LED Technical Field The embodiment of the invention relates to the field of printed circuit boards, in particular to a PCB ink color classification method, device and system of Micro-LEDs. Background The Micro-LED display screen is a high-density LED display screen formed by taking self-luminous micron-sized LEDs as luminous pixel units and assembling the luminous pixel units on a driving panel. A printed circuit board (Printed circuit boards, PCB) is an important component of Micro-LEDs. At present, the production of Micro-LED display screens is generally to directly purchase a printed circuit board, process the printed circuit board into LED unit boards, and select a plurality of unit boards for processing and assembling according to requirements when the Micro-LED display screens are assembled, so as to obtain the assembled Micro-LED display screens. However, ink color differences exist among purchased printed circuit board batches, so that the assembled Micro-LED display screen is directly caused to have uneven ink color, and the display quality of the Micro-LED display screen is reduced. It can be seen that there is currently an urgent need for a way to categorize ink colors on printed circuit boards to avoid affecting the consistency of ink colors of Micro-LED displays after assembly. Disclosure of Invention The embodiment of the invention provides a method, a device and a system for classifying ink colors of a PCB (printed circuit board) of a Micro-LED (light emitting diode), which are used for classifying the ink colors of the PCB so as to ensure the consistency of the ink colors of the PCB after the PCB is assembled, thereby avoiding the occurrence of ink color effect difference and improving the display quality of a Micro-LED display screen. In a first aspect, an embodiment of the present invention provides a method for classifying ink colors of a PCB of a Micro-LED, the method comprising: acquiring a target printed circuit board image acquired under the irradiation of a linear light source of a target printed circuit board to be classified; performing region division on the target circuit board image to obtain a plurality of target region images corresponding to the target printed circuit board; Determining a first reflectivity corresponding to each target area image based on standard light source information of the linear light source, and determining a second reflectivity corresponding to the target printed circuit board and a target reflectivity extremely poor based on the first reflectivity; And classifying the ink colors based on the second reflectivity, the extremely poor target reflectivity and the preset reflectivity change range corresponding to each ink color type, and determining the target ink color type corresponding to the target printed circuit board, wherein the printed circuit board corresponding to the preset reflectivity change range has ink color consistency. In a second aspect, an embodiment of the present invention provides a PCB ink color sorting apparatus for Micro-LEDs, the apparatus comprising: The target circuit board image acquisition model is used for acquiring target circuit board images acquired by the target printed circuit board to be classified under the irradiation of the linear light source; The target area image determining model is used for dividing the area of the target circuit board image to obtain a plurality of target area images corresponding to the target printed circuit board; the first reflectivity determining model is used for determining a first reflectivity corresponding to each target area image based on standard light source information of the linear light source and determining a second reflectivity corresponding to the target printed circuit board and a target reflectivity extremely poor based on the first reflectivity; And the target ink color type determining model is used for classifying the ink colors based on the second reflectivity, the extremely poor target reflectivity and the preset reflectivity change range corresponding to each ink color type, and determining the target ink color type corresponding to the target printed circuit board, wherein the printed circuit board corresponding to the preset reflectivity change range has ink color consistency. In a third aspect, the embodiment of the invention provides a PCB ink color classification system of a Micro-LED, which comprises an image acquisition end, a linear light source and a controller, wherein, The acquisition end is used for acquiring a target circuit board image of the target printed circuit board under the irradiation of the linear light source; the controller is used for realizing the PCB ink color classification method of the Micro-LED according to any one of claims 1 to 8. According to the technical scheme, the target printed circuit board image acquired under the irradiation of the linear light source is acqu