Full-screen mobile phone screen detection device and detection method based on machine vision

Abstract

The invention discloses a full-screen mobile phone screen detection device and a detection method based on machine vision. The detection device comprises a detection cabinet, a detection platform, a front-and-back motion component, a machine vision component mounting plate, a machine vision detection component, and a control system. The front-and-back motion component is used for moving the front-and-back position during mobile phone screen detection and placing a mobile phone to be detected. The machine vision detection component is used for detecting the mobile phone screen. The control system is used for controlling the entire device. The detection method is to detect the distance from a liquid crystal screen to a frame by taking a photo from above, and to detect the distance from a backlight panel to a frame by taking a photo from below, and to obtain the distance difference between the two to obtain the distance from the backlight panel frame to the liquid crystal screen frame. The device uses a machine vision component to complete parameter measurement of the full-screen mobile phone, and the detection result is accurate and the detection efficiency is high. The distance from the backlight panel to the liquid crystal screen of the full-screen mobile phone is directly calculated by a detection method of taking photos simultaneously from top to bottom, thereby greatly improving the detection efficiency.

Description

Technical Field

[0001] The present invention relates to the field of mobile phone detection technology, and in particular to a full-screen mobile phone screen detection device and detection method based on machine vision. Background Art

[0002] With the development of society, mobile phones have become an important and indispensable tool in people's daily life and work, and smart phones have become the mainstream of mobile phone development. With the improvement of people's quality of life, the requirements for the appearance and visual experience of mobile phones are also increasing. The development of full-screen technology meets people's requirements for the appearance and visual experience of mobile phones. The screen-to-body ratio is an important parameter to measure the appearance of full-screen mobile phones. It also has strict requirements in actual production. Whether the screen-to-body ratio of the produced mobile phones meets the requirements needs further measurement. The main measurement is the distance from the LCD screen to the mobile phone frame. Since the current mobile phone screen-to-body ratio has reached more than 80%, manual measurement can no longer be achieved, and it is even more impossible to meet the requirements of high-precision measurement and ensure measurement accuracy.

[0003] In the production process of full-screen mobile phone screens, the backlight panel is placed under the LCD screen, and the LCD screen and the backlight panel are fixed between the front frame and the back frame of the mobile phone. There are requirements for the position of the backlight panel to the edge of the LCD screen. If there is a deviation in the position, the LCD screen will not display. Therefore, it is necessary to accurately measure the distance from the backlight panel to the edge of the LCD screen to ensure that the backlight panel is located directly below the LCD screen. The traditional manual measurement method has low efficiency and low precision and cannot meet the needs of automated production. Faced with production lines with increasingly high degrees of automation, a solution that can quickly and accurately measure the distance from the backlight panel to the edge of the LCD screen is needed to meet the needs of automated production. Summary of the invention

[0004] In order to solve the current problem of accurately measuring the distance from the LCD screen to the frame and the distance from the backlight panel to the edge of the LCD screen of a full-screen mobile phone, the present invention proposes a full-screen mobile phone screen detection device and detection method based on machine vision. This detection device performs measurement based on machine vision, has accurate measurement results, and has high detection accuracy. It can accurately measure the distance from the mobile phone LCD screen to the frame, and improves detection efficiency and detection accuracy. This detection method simultaneously detects the distance from the LCD screen and the backlight panel to the frame from the front and back respectively, calculates the distance from the backlight panel to the LCD screen, realizes the measurement of the distance from the backlight panel to the LCD screen, and ensures the qualified rate of mobile phone screen production.

[0005] The technical solution adopted by the present invention is: a full-screen mobile phone screen detection device based on machine vision, comprising a detection cabinet (100), a detection platform (200), a module mounting plate (300), a front-back motion component (400), a left-right motion component (500), an up-and-down motion component (600), a machine vision detection component (700), and a control system;

[0006] The detection platform (200) is installed inside the detection cabinet (100), the front-back motion assembly (400) is installed on the upper surface of the detection platform (200), the module mounting plate (300) is fixed on the left side of the detection platform (200), the left-right motion assembly (500) is installed on the module mounting plate (300), the up-down motion assembly (600) is installed on the left-right motion assembly (500), and the machine vision detection assembly (700) is installed on the up-down motion assembly (600);

[0007] The detection platform (200) is installed inside the detection cabinet (100), and the detection cabinet (100) is divided into two parts, the upper part of the detection cabinet (100) is closed by transparent glass, and there are openings on the detection platform (200), including module installation holes (210) and detection holes (220), the module installation holes (210) are located at both sides of the front and rear movement components (400), and the detection holes (220) are located in the middle of the front and rear movement components (400);

[0008] The module mounting plate (300) is a U-shaped structure and is fixedly mounted on the detection platform (200) through the module mounting hole (210);

[0009] The forward and backward motion assembly (400) is located between the module mounting plates (300), and comprises a first linear module (410), a left mounting plate (420), a secondary guide rail (430), a right mounting plate (440), a forward and backward motion motor, and a mobile phone placement tool (450); the first linear module (410) is mounted on the left side of the detection platform (200); the left mounting plate (420) is mounted above the first linear module (410) and moves forward and backward following the first linear module (410); the secondary guide rail (430) is parallel to the first linear module (410) and is mounted on the right side of the first linear module (410); the right mounting plate (440) is mounted above the secondary guide rail (430); the forward and backward motion motor is mounted behind the first linear module (410); one side of the mobile phone placement tool (450) is fixedly mounted on the left mounting plate (420), and the other side is fixedly mounted on the right mounting plate (440);

[0010] There are two groups of left-right motion components (500) with the same structure. The first left-right motion component (510) is installed on the upper part of the module mounting plate (300) and is located above the detection platform (200). The second left-right motion component (520) is installed on the lower part of the module mounting plate (300) and is located below the detection platform (200). It includes a second linear module (511), a left-right motion motor (512), and a slider (513). The second linear module (511) is installed on the module mounting plate (300), the left-right motion motor (512) is installed on the left side of the second linear module (511), and the slider (513) is installed on the second linear module (511).

[0011] The vertical motion components (600) have four groups in total. The first vertical motion component (610) and the second vertical motion component (620) have the same structure and are installed on the first left and right motion component (510). The third vertical motion component (630) and the fourth vertical motion component (640) have the same structure and are installed on the second left and right motion component (520). The first vertical motion component (610), the second vertical motion component (620), the third vertical motion component (630) and the fourth vertical motion component (640) all include a third linear module (611), a machine A vision mounting plate (612), an up-and-down motion motor (613), the third linear module (611) being mounted on the slider (513), the machine vision mounting plate (612) being mounted on the third linear module (611), the up-and-down motion motors (613) of the first up-and-down motion assembly (610) and the second up-and-down motion assembly (620) being mounted above the third linear module (611), and the up-and-down motion motors (613) of the third up-and-down motion assembly (630) and the fourth up-and-down motion assembly (640) being mounted below the third linear module (611);

[0012] The machine vision detection components (700) have four groups in total, wherein the first machine vision detection component (710) is mounted on the machine vision mounting plate (612) of the first up-and-down motion component (610), the second machine vision detection component (720) is mounted on the machine vision mounting plate (612) of the second up-and-down motion component (620), the third machine vision detection component (730) is mounted on the machine vision mounting plate (612) of the third up-and-down motion component (630), and the fourth machine vision detection component (740) is mounted on the machine vision mounting plate (612) of the fourth up-and-down motion component (640). The first machine vision detection component (710), the second machine vision detection component (720), the third machine vision detection component (730), and the fourth machine vision detection component (740) all include a fixing bracket (711), an industrial camera (712), a telecentric lens ( 713), a visual light source (714), the fixed bracket (711) is mounted on the machine vision mounting plate (612), the fixed bracket (711) is an "L"-shaped structure, and a short side has an opening, the telecentric lenses (713) of the first machine vision detection component (710) and the second machine vision detection component (720) are fixed to the fixed bracket (711) through the opening, the industrial camera (712) is connected to the telecentric lens (713) and is located above the telecentric lens (713), the visual light source (714) is installed below the telecentric lens (713), the telecentric lenses (713) of the third machine vision detection component (730) and the fourth machine vision detection component (740) are fixed to the fixed bracket (711) through the opening, the industrial camera (712) is connected to the telecentric lens (713) and is located below the telecentric lens (713), and the visual light source (714) is installed above the telecentric lens.

[0013] As a preferred embodiment of the detection device disclosed in the present invention: the control system includes a computer, a PLC programmable logic controller, and a light source controller, the computer is connected to the PLC programmable logic controller, the PLC programmable logic controller is connected to the computer, the light source controller, the front and rear motion motor, the left and right motion motor (512), the up and down motion motor (613), and the industrial camera (712), and the light source controller is connected to the visual light source (714).

[0014] As a preferred embodiment of the detection device disclosed in the present invention: the mobile phone placement tool (460) is a countersunk hole with a hollow structure in the middle.

[0015] As a preferred embodiment of the detection device disclosed in the present invention: the visual light source (714) of the machine vision detection component (700) is a coaxial light source.

[0016] As a preferred embodiment of the detection device disclosed in the present invention: strip light sources are also installed around the inner wall of the detection hole (220), and the front and rear strip light sources are of the same length, and the left and right strip light sources are of the same length.

[0017] The present invention also discloses a full-screen mobile phone screen detection method based on machine vision, which comprises the following steps:

[0018] Step 1: Divide the front of the full-screen phone into four areas: A, B, C, and D;

[0019] Step 2: Divide the back of the full-screen phone into four areas: E, F, G, and H;

[0020] Step 3: The first machine vision detection component (710) and the second machine vision detection component (720) detect four areas A, B, C, and D on the front of the full-screen mobile phone, and calculate the distance from the LCD screen to the frame of the mobile phone;

[0021] Step 4: The third machine vision detection component (730) and the fourth machine vision detection component (740) detect four areas E, F, G, and H on the back of the full-screen mobile phone, and calculate the distance from the backlight panel to the mobile phone frame;

[0022] Step 5: Calculate the difference between the distance from the LCD screen to the phone frame and the distance from the backlight panel to the phone frame to obtain the distance from the LCD screen frame to the backlight panel frame.

[0023] As a preferred method of the detection method disclosed in the present invention, the above method further comprises the following steps:

[0024] S1: placing a full-screen mobile phone in a mobile phone placement tool (450) of a front and rear motion assembly (400);

[0025] S2: the front-rear moving assembly (400) moves to a first detection position;

[0026] S3: Take pictures of the front of the full-screen phone from above, and take pictures of the back of the full-screen phone from below;

[0027] S4: the forward and backward movement assembly (400) continues to move to a second detection position;

[0028] S5: Take a photo of the front of the full-screen phone from above, and take a photo of the back of the full-screen phone from below;

[0029] S6: Computer image processing software processes the image and calculates the result.

[0030] Beneficial effects of the present invention:

[0031] The present invention discloses a full-screen mobile phone screen detection device and detection method based on machine vision. The detection device includes a detection cabinet, a detection platform, a module mounting plate, a front-to-back motion component, a left-to-right motion component, an up-and-down motion component, a machine vision detection component, and a control system. The detection platform is installed in the detection cabinet, the front-to-back motion component is installed on the upper surface of the detection platform, the module mounting plate is fixed to the left side of the detection platform, the left-to-right motion component is installed on the module mounting plate, the up-and-down motion component is installed on the left-to-right motion component, and the machine vision detection component is installed on the up-and-down motion component. The device has a simple structure and highly integrated modules, and is easy to install, use, and maintain.

[0032] The present invention discloses a full-screen mobile phone screen detection device and detection method based on machine vision. The left and right motion components of the detection device can move left and right, and the up and down motion components can move up and down. The machine vision detection component installed on the up and down motion component can realize up and down position adjustment and left and right position adjustment, so as to obtain more accurate detection images, improve detection accuracy, and ensure the product quality of the produced mobile phone screens.

[0033] The present invention discloses a full-screen mobile phone screen detection device and detection method based on machine vision. The machine vision detection component of the detection device uses a telecentric lens. The telecentric lens has the advantages of high resolution, ultra-wide depth of field, and ultra-low distortion. It can meet the high-precision detection requirements of full-screen mobile phone measurements, realize high-precision detection of the distance of full-screen mobile phones, and ensure the qualified rate of mobile phone screen production.

[0034] The present invention provides a full-screen mobile phone screen detection device and detection method based on machine vision. The detection method detects the distance from the front liquid crystal screen of the full-screen mobile phone to the mobile phone frame by a first machine vision detection component and a second machine vision detection component, detects the distance from the back back light panel of the full-screen mobile phone to the mobile phone frame by a third machine vision detection component and a fourth machine vision detection component, and the difference between these two distances is obtained to obtain the distance from the back light panel to the liquid crystal screen. Four groups of machine vision detection components take photos for detection at the same time, and the distance from the back light panel to the liquid crystal screen can be calculated by taking photos twice, thereby greatly improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the three-dimensional structure of the full-screen mobile phone screen detection device based on machine vision proposed by the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the detection platform of the full-screen mobile phone screen detection device based on machine vision proposed by the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the module installation board of the full-screen mobile phone screen detection device based on machine vision proposed by the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the front and rear motion components of the full-screen mobile phone screen detection device based on machine vision proposed by the present invention;

[0039] Figure 5 This is a schematic diagram of the structure of the left and right motion components of the full-screen mobile phone screen detection device based on machine vision proposed by the present invention;

[0040] Figure 6 This is a schematic diagram of the structure of the up and down motion components of the full-screen mobile phone screen detection device based on machine vision proposed by the present invention;

[0041] Figure 7 This is a schematic diagram of the structure of the machine vision detection component of the full-screen mobile phone screen detection device based on machine vision proposed by the present invention;

[0042] Figure 8 This is a control system flow chart of the full-screen mobile phone screen detection device based on machine vision proposed by the present invention;

[0043] Fig. 9 This is a front schematic diagram of a detection method of a full-screen mobile phone screen detection device based on machine vision proposed by the present invention;

[0044] Fig.10 This is a schematic diagram of the back side of the detection method of the full-screen mobile phone screen detection device based on machine vision proposed by the present invention;

[0045] Fig.11 This is a schematic diagram of the positions of the backlight panel and the LCD screen in the detection method of the full-screen mobile phone screen detection device based on machine vision proposed by the present invention.

[0046] Description of Reference Numerals

[0047] 100-testing cabinet, 200-testing platform, 210-module mounting hole, 220-testing hole, 300-module mounting plate, 400-front and rear motion assembly, 410-first linear module, 420-left mounting plate, 430-second guide rail, 440-right mounting plate, 450-mobile phone placement tooling, 500-left and right motion assembly, 510-first left and right motion assembly, 511-second linear module, 512-left and right motion motor, 513-slider, 520-second left and right motion assembly, 600-up and down motion assembly, 610-first up Lower motion assembly, 611-third linear module, 612-machine vision mounting plate, 613-up and down motion motor, 620-second up and down motion assembly, 630-third up and down motion assembly, 640-fourth up and down motion assembly, 700-machine vision detection assembly, 710-first machine vision detection assembly, 711-fixed bracket, 712-industrial camera, 713-telecentric lens, 714-visual light source, 720-second machine vision detection assembly, 730-third machine vision detection assembly, 740-fourth machine vision detection assembly. DETAILED DESCRIPTION

[0048] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0049] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0050] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0051] like Figures 1 to 11 As shown, it shows a specific implementation mode of the present invention; the present invention discloses a full-screen mobile phone screen detection device and detection method based on machine vision, and the detection device includes: a detection cabinet 100, a detection platform 200, a module mounting plate 300, a front and rear motion component 400, a left and right motion component 500, an up and down motion component 600, a machine vision detection component 700, and a control system.

[0052] like Figure 1As shown, the detection platform 200 is installed inside the detection cabinet 100, the front and rear motion component 400 is installed on the upper surface of the detection platform 200, the module mounting plate 300 is fixed to the left side of the detection platform 200, the left and right motion component 500 is installed on the module mounting plate 300, the up and down motion component 600 is installed on the left and right motion component 500, and the machine vision detection component 700 is installed on the up and down motion component 600.

[0053] In the present invention, the detection platform 200 is used to fix the module mounting plate 300 and the front-back movement component 400. The front-back movement component 400 is used to place the full-screen mobile phone to be detected and realize the front-back movement of the full-screen mobile phone. The left-right movement component 500 can move left-right to adjust the left-right position. The up-down movement component 600 is installed on the left-right movement component 500 and can move up-down to adjust the up-down position. The machine vision detection component 700 is installed on the up-down movement component 600 to collect information from the mobile phone screen, and then detect the distance from the mobile phone LCD screen to the frame and the distance from the backlight panel to the LCD screen. At the same time, the machine vision detection component 700 can realize left-right and up-down movement, collect more accurate image information, improve the accuracy of the detection results, and ensure the qualified rate. The device has a simple structure and highly integrated modules, which is easy to install, use and maintain.

[0054] like Figure 1 and Figure 2 As shown, the detection platform 200 is installed in the detection cabinet 100, dividing the detection cabinet 100 into two parts, the upper part of the detection cabinet 100 is closed with transparent glass, and there are openings on the detection platform 200, including module mounting holes 210 and detection holes 220. The module mounting holes 210 are located on both sides of the front and rear movement components 400, and the detection holes 220 are located in the middle of the front and rear movement components 400.

[0055] In the present invention, the upper half of the detection cabinet 100 is enclosed with transparent glass to facilitate observation of the working condition of the detection device. The module mounting hole 210 is used to fix the module mounting plate 300. The detection hole 220 is used to detect the backlight panel of the full-screen mobile phone to be detected. The distance from the backlight panel of the full-screen mobile phone to the frame is detected from below through the detection hole 220.

[0056] like Figure 3 As shown, the module mounting plate 300 is a U-shaped structure and is fixedly mounted on the detection platform 200 through the module mounting holes 210 .

[0057] like Figure 4As shown, the forward and backward motion component 400 is located between the module mounting plates 300, and includes a first linear module 410, a left mounting plate 420, a secondary guide rail 430, a right mounting plate 440, a forward and backward motion motor, and a mobile phone placement tooling 450. The first linear module 410 is mounted on the left side of the detection platform 200, the left mounting plate 420 is mounted above the first linear module 410, and moves forward and backward following the first linear module 410. The secondary guide rail 430 is parallel to the first linear module 410 and is mounted on the right side of the first linear module 410. The right mounting plate 440 is mounted above the secondary guide rail 430. The forward and backward motion motor is mounted behind the first linear module 410. One side of the mobile phone placement tooling 450 is fixedly mounted on the left mounting plate 420, and the other side is fixedly mounted on the right mounting plate 440.

[0058] In the present invention, the first linear module 410 is driven by a forward and backward motion motor, and the left mounting plate 420 installed above it moves forward and backward, and the right mounting plate 440 connected to the left mounting plate 420 through the mobile phone placement tooling 450 moves forward and backward on the secondary guide rail 430, thereby realizing the forward and backward movement of the mobile phone placement tooling 450. When detecting the full-screen mobile phone screen, the distance from the left LCD screen to the mobile phone frame and the distance from the left backlight panel to the mobile phone frame are first detected, and then the mobile phone placement tooling 450 moves to the right to detect the distance from the right LCD screen to the mobile phone frame and the distance from the right backlight panel to the mobile phone frame, thereby realizing the detection of the distance from the LCD screen, the backlight panel to the mobile phone frame.

[0059] like Figure 5 As shown, there are two groups of left and right motion components 500 with the same structure. The first left and right motion component 510 is installed on the upper part of the module mounting plate 300, located above the detection platform 200, and the second left and right motion component 520 is installed on the lower part of the module mounting plate 300, located below the detection platform 200, including a second linear module 511, a left and right motion motor 512, and a slider 513. The second linear module 511 is installed on the module mounting plate 300, the left and right motion motor 512 is installed on the left side of the second linear module 511, and the slider 513 is installed on the second linear module 511.

[0060] In the present invention, there are two groups of left and right motion components 500 with the same structure. The first left and right motion component 510 is installed on the upper part of the module mounting plate 300, located above the detection platform 200, and is used for left and right position adjustment of the first machine vision detection component 710 and the second machine vision detection component 720. The second left and right motion component 520 is installed on the lower part of the module mounting plate 300, located below the detection platform 200, and is used for left and right position adjustment of the third machine vision detection component 730 and the fourth machine vision detection component 740. The left and right motion motor 512 drives the slider 513 installed on the second linear module 511 to move left and right to achieve left and right position adjustment.

[0061] like Figure 6 As shown, there are four groups of up and down motion components 600, the first up and down motion component 610 and the second up and down motion component 620 have the same structure and are installed on the first left and right motion component 510, the third up and down motion component 630 and the fourth up and down motion component 640 have the same structure and are installed on the second left and right motion component 520, the first up and down motion component 610, the second up and down motion component 620, the third up and down motion component 630 and the fourth up and down motion component 640 all include a third linear module 611, a machine vision mounting plate 612, and an up and down motion motor 613, the third linear module 611 is installed on the slider 513, the machine vision mounting plate 612 is installed on the third linear module 611, the up and down motion motors 613 of the first up and down motion component 610 and the second up and down motion component 620 are installed above the third linear module 611, and the up and down motion motors 613 of the third up and down motion component 630 and the fourth up and down motion component 640 are installed below the third linear module 611.

[0062] In the present invention, the third linear module 611 of the first up and down motion component 610, the second up and down motion component 620, the third up and down motion component 630 and the fourth up and down motion component 640 is installed on the slider 513, and follows the left and right movement of the slider 513 to achieve left and right position adjustment. The machine vision mounting plate 612 is installed on the third linear module 611, and the up and down position adjustment is achieved under the drive of the up and down motion motor 613.

[0063] like Figure 7As shown, there are four groups of machine vision detection components 700, the first machine vision detection component 710 is installed on the machine vision mounting plate 612 of the first up and down motion component 610, the second machine vision detection component 720 is installed on the machine vision mounting plate 612 of the second up and down motion component 620, the third machine vision detection component 730 is installed on the machine vision mounting plate 612 of the third up and down motion component 630, and the fourth machine vision detection component 740 is installed on the machine vision mounting plate 612 of the fourth up and down motion component 640. The first machine vision detection component 710, the second machine vision detection component 720, the third machine vision detection component 730, and the fourth machine vision detection component 740 all include a fixing bracket 711, an industrial camera 712, Telecentric lens 713, visual light source 714, the fixed bracket 711 is installed on the machine vision mounting plate 612, the fixed bracket 711 is an "L" shaped structure with an opening on the short side, the telecentric lens 713 of the first machine vision detection component 710 and the second machine vision detection component 720 is fixed on the fixed bracket 711 through the opening, the industrial camera 712 is connected to the telecentric lens 713 and is located above the telecentric lens 713, and the visual light source 714 is installed below the telecentric lens 713, the telecentric lens 713 of the third machine vision detection component 730 and the fourth machine vision detection component 740 is fixed on the fixed bracket 711 through the opening, the industrial camera 712 is connected to the telecentric lens 713 and is located below the telecentric lens 713, and the visual light source 714 is installed above the telecentric lens.

[0064] In the present invention, the first machine vision detection component 710 and the second machine vision detection component 720 have the same structure and are used to measure the distance between the liquid crystal panel and the frame on the front of the full-screen mobile phone screen. The third machine vision detection component 730 and the fourth machine vision detection component 740 have the same structure and are used to measure the distance between the backlight panel and the frame on the back of the full-screen mobile phone. In the computer, according to the measurement result, the distance from the LCD screen to the frame is subtracted from the distance from the backlight panel to the frame to obtain the distance from the backlight panel to the LCD screen, thereby realizing the measurement of the distance from the LCD screen to the frame and the distance from the backlight panel to the LCD screen frame of the full-screen mobile phone screen, ensuring the qualified rate of the full-screen mobile phone screen, and using the machine vision detection component 700 for detection, which has high precision and fast speed, greatly improving the detection efficiency and detection accuracy. At the same time, the telecentric lens of the machine vision detection component 700 has the advantages of high resolution, ultra-wide depth of field, and ultra-low distortion, which can meet the high-precision detection requirements of full-screen mobile phone measurements, realize high-precision detection of the distance of full-screen mobile phones, and ensure the qualified rate of mobile phone screen production.

[0065] like Figure 8As shown, the control system includes a computer, a PLC programmable logic controller, and a light source controller. The computer is connected to the PLC programmable logic controller, and the PLC programmable logic controller is connected to the computer, the light source controller, the front and rear motion motor, the left and right motion motor 512, the up and down motion motor 613, and the industrial camera 712. The light source controller is connected to the visual light source 714.

[0066] In the present invention, the computer control is connected to the PLC programmable logic controller, the PLC programmable logic controller controls the connection to the light source controller, the front and rear motion motor, the left and right motion motor 512, the up and down motion motor 613, and the industrial camera 712, and the light source controller controls the connection to the visual light source 714.

[0067] The detection method is that the first machine vision detection component 710 and the second machine vision detection component 720 detect the distance from the front LCD screen of the full-screen mobile phone to the mobile phone frame, and the third machine vision detection component 730 and the fourth machine vision detection component 740 detect the distance from the back back light panel of the full-screen mobile phone to the mobile phone frame, and the difference between these two distances is obtained to obtain the distance from the back light panel to the LCD screen.

[0068] like Fig. 9 , Fig.10 and Fig.11 As shown, the detection steps are:

[0069] Step 1: Place the full-screen mobile phone in the mobile phone placement tool 450 of the front and rear motion assembly 400;

[0070] In the present invention, the full-screen mobile phone is placed in the mobile phone placement tooling 450, with the LCD screen of the full-screen mobile phone facing upward, which is the front side, and the backlight panel of the full-screen mobile phone facing downward, which is the back side.

[0071] Step 2: The forward and backward moving assembly 400 moves to a first detection position;

[0072] In the present invention, the first detection position is the position on the right side of the full-screen mobile phone directly below the machine vision detection component 700, that is, area A on the front of the full-screen mobile phone is directly below the first machine vision detection component 710, area B on the front of the full-screen mobile phone is directly below the second machine vision detection component 720, area E on the back of the full-screen mobile phone is directly above the third machine vision detection component 730, and area F on the back of the full-screen mobile phone is directly above the fourth machine vision detection component 740.

[0073] Step 3: Take a photo of the front of the full-screen phone from above, and take a photo of the back of the full-screen phone from below;

[0074] In the present invention, the first machine vision detection component 710, the second machine vision detection component 720, the third machine vision detection component 730, and the fourth machine vision detection component 740 take pictures simultaneously. The first machine vision detection component 710 takes a picture of area A on the front of the full-screen mobile phone, the second machine vision detection component 720 takes a picture of area B on the front of the full-screen mobile phone, the third machine vision detection component 730 takes a picture of area E on the back of the full-screen mobile phone, and the fourth machine vision detection component 740 takes a picture of area F on the back of the full-screen mobile phone.

[0075] Step 4: The forward and backward moving assembly 400 continues to move to the second detection position;

[0076] In the present invention, the second detection position is the position on the left side of the full-screen mobile phone directly below the machine vision detection component 700, that is, area D on the front of the full-screen mobile phone is directly below the first machine vision detection component 710, area C on the front of the full-screen mobile phone is directly below the second machine vision detection component 720, area H on the back of the full-screen mobile phone is directly above the third machine vision detection component 730, and area G on the back of the full-screen mobile phone is directly above the fourth machine vision detection component 740.

[0077] Step 5: Take a photo of the front of the full-screen phone from above, and take a photo of the back of the full-screen phone from below;

[0078] In the present invention, the first machine vision detection component 710, the second machine vision detection component 720, the third machine vision detection component 730, and the fourth machine vision detection component 740 take pictures simultaneously. The first machine vision detection component 710 takes a picture of area D on the front of the full-screen mobile phone, the second machine vision detection component 720 takes a picture of area C on the front of the full-screen mobile phone, the third machine vision detection component 730 takes a picture of area H on the back of the full-screen mobile phone, and the fourth machine vision detection component 740 takes a picture of area G on the back of the full-screen mobile phone.

[0079] Step 6: Use computer image processing software to process the image and calculate the result.

[0080] In the present invention, the detection method is:

[0081] Step 1: Divide the front of the full-screen phone into four areas: A, B, C, and D;

[0082] Step 2: Divide the back of the full-screen phone into four areas: E, F, G, and H;

[0083] Step 3: The first machine vision detection component (710) and the second machine vision detection component (720) detect four areas A, B, C, and D on the front of the full-screen mobile phone, and calculate the distance from the LCD screen to the frame of the mobile phone;

[0084] Step 4: The third machine vision detection component (730) and the fourth machine vision detection component (740) detect four areas E, F, G, and H on the back of the full-screen mobile phone, and calculate the distance from the backlight panel to the mobile phone frame;

[0085] Step 5: Calculate the difference between the distance from the LCD screen to the phone frame and the distance from the backlight panel to the phone frame to obtain the distance from the LCD screen frame to the backlight panel frame.

[0086] In the present invention, the image processing software processes the pictures taken by the machine vision detection component 700, and calculates the distance l1', l2', l3', l4', l5', l6', l7', l8' from the LCD screen to the mobile phone frame based on the pictures of the A, B, C, and D areas. The distance l1", l2", l3", l4", l5", l6", l7", l8" from the backlight panel to the mobile phone frame is calculated based on the pictures of the E, F, G, and H areas. The difference between the distance from the LCD screen to the mobile phone frame and the distance from the backlight panel to the mobile phone frame is calculated to obtain the distance from the backlight panel to the LCD screen, that is, l1=l1'-l1", l2=l2'-l2", l3=l3'-l3", l4=l4'-l4", l5=l5'-l5", l6=l6'-l6", l7=l7'-l7", l8=l8'-l8".

[0087] In the present invention, the distances from the LCD screen to the frame of the mobile phone at a total of 8 positions, namely the top, bottom, left and right of the full-screen mobile phone screen, are measured by such a detection method. The distances at these 8 positions are all within the error range, thereby ensuring that the backlight panel is directly below the position of the LCD screen, the production of the full-screen mobile phone meets the requirements, the mobile phone screen lights up normally, and the qualified rate of the production of the full-screen mobile phone screen is guaranteed.

[0088] Preferably, the mobile phone placement tool 460 is a countersunk hole with a hollow structure in the middle, which is convenient for the third machine vision detection component 730 and the fourth machine vision detection component 740 to detect the distance from the back light panel to the frame of the full-screen mobile phone.

[0089] Preferably, the visual light source 714 of the machine vision detection component 700 is a coaxial light source, which overcomes the interference caused by the reflection of the surface of the full-screen mobile phone and improves the detection accuracy.

[0090] Preferably, strip light sources are installed around the inner wall of the detection hole 220. The front and rear strip light sources have the same length, and the left and right strip light sources have the same length. The strip light sources ensure the brightness of the full-screen mobile phone detection environment, which is beneficial for the machine vision detection component 700 to collect more accurate images and improve the accuracy of the detection results.

[0091] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

[0092] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A full-screen mobile phone screen detection device based on machine vision, characterized in that: It comprises a detection cabinet (100), a detection platform (200), a module mounting plate (300), a front-to-back motion component (400), a left-to-right motion component (500), an up-and-down motion component (600), a machine vision detection component (700), and a control system; The detection platform (200) is installed inside the detection cabinet (100), the front-back motion assembly (400) is installed on the upper surface of the detection platform (200), the module mounting plate (300) is fixed on the left side of the detection platform (200), the left-right motion assembly (500) is installed on the module mounting plate (300), the up-down motion assembly (600) is installed on the left-right motion assembly (500), and the machine vision detection assembly (700) is installed on the up-down motion assembly (600); The detection platform (200) is installed inside the detection cabinet (100), and the detection cabinet (100) is divided into two parts, the upper part of the detection cabinet (100) is closed by transparent glass, and there are openings on the detection platform (200), including module installation holes (210) and detection holes (220), the module installation holes (210) are located at both sides of the front and rear movement components (400), and the detection holes (220) are located in the middle of the front and rear movement components (400); The module mounting plate (300) is a U-shaped structure and is fixedly mounted on the detection platform (200) through the module mounting hole (210); The forward and backward motion assembly (400) is located between the module mounting plates (300), and comprises a first linear module (410), a left mounting plate (420), a secondary guide rail (430), a right mounting plate (440), a forward and backward motion motor, and a mobile phone placement tool (450); the first linear module (410) is mounted on the left side of the detection platform (200); the left mounting plate (420) is mounted above the first linear module (410) and moves forward and backward following the first linear module (410); the secondary guide rail (430) is parallel to the first linear module (410) and is mounted on the right side of the first linear module (410); the right mounting plate (440) is mounted above the secondary guide rail (430); the forward and backward motion motor is mounted behind the first linear module (410); one side of the mobile phone placement tool (450) is fixedly mounted on the left mounting plate (420), and the other side is fixedly mounted on the right mounting plate (440); There are two groups of left-right motion components (500) with the same structure. The first left-right motion component (510) is installed on the upper part of the module mounting plate (300) and is located above the detection platform (200). The second left-right motion component (520) is installed on the lower part of the module mounting plate (300) and is located below the detection platform (200). It includes a second linear module (511), a left-right motion motor (512), and a slider (513). The second linear module (511) is installed on the module mounting plate (300), the left-right motion motor (512) is installed on the left side of the second linear module (511), and the slider (513) is installed on the second linear module (511). The vertical motion components (600) have four groups in total. The first vertical motion component (610) and the second vertical motion component (620) have the same structure and are installed on the first left and right motion component (510). The third vertical motion component (630) and the fourth vertical motion component (640) have the same structure and are installed on the second left and right motion component (520). The first vertical motion component (610), the second vertical motion component (620), the third vertical motion component (630) and the fourth vertical motion component (640) all include a third linear module (611), a machine A vision mounting plate (612), an up-and-down motion motor (613), the third linear module (611) being mounted on the slider (513), the machine vision mounting plate (612) being mounted on the third linear module (611), the up-and-down motion motors (613) of the first up-and-down motion assembly (610) and the second up-and-down motion assembly (620) being mounted above the third linear module (611), and the up-and-down motion motors (613) of the third up-and-down motion assembly (630) and the fourth up-and-down motion assembly (640) being mounted below the third linear module (611); The machine vision detection components (700) have four groups in total, wherein the first machine vision detection component (710) is mounted on the machine vision mounting plate (612) of the first up-and-down motion component (610), the second machine vision detection component (720) is mounted on the machine vision mounting plate (612) of the second up-and-down motion component (620), the third machine vision detection component (730) is mounted on the machine vision mounting plate (612) of the third up-and-down motion component (630), and the fourth machine vision detection component (740) is mounted on the machine vision mounting plate (612) of the fourth up-and-down motion component (640). The first machine vision detection component (710), the second machine vision detection component (720), the third machine vision detection component (730), and the fourth machine vision detection component (740) all include a fixing bracket (711), an industrial camera (712), a telecentric lens ( 713), a visual light source (714), the fixed bracket (711) is mounted on the machine vision mounting plate (612), the fixed bracket (711) is an "L"-shaped structure, with an opening on the short side, the telecentric lenses (713) of the first machine vision detection component (710) and the second machine vision detection component (720) are fixed on the fixed bracket (711) through the opening, the industrial camera (712) is connected to the telecentric lens (713) and is located above the telecentric lens (713), the visual light source (714) is installed below the telecentric lens (713), the telecentric lenses (713) of the third machine vision detection component (730) and the fourth machine vision detection component (740) are fixed on the fixed bracket (711) through the opening, the industrial camera (712) is connected to the telecentric lens (713) and is located below the telecentric lens (713), and the visual light source (714) is installed above the telecentric lens.

2. The full-screen mobile phone screen detection device based on machine vision as claimed in claim 1, characterized in that: The control system comprises a computer, a PLC programmable logic controller, and a light source controller. The computer is connected to the PLC programmable logic controller. The PLC programmable logic controller is connected to the computer, the light source controller, a front-to-back motion motor, a left-to-right motion motor (512), an up-and-down motion motor (613), and an industrial camera (712). The light source controller is connected to a visual light source (714).

3. The full-screen mobile phone screen detection device based on machine vision according to claim 1, characterized in that: The mobile phone placement tool (460) is a countersunk hole with a hollow structure in the middle.

4. The full-screen mobile phone screen detection device based on machine vision according to claim 1, characterized in that: The visual light source (714) of the machine vision detection component (700) is a coaxial light source.

5. The full-screen mobile phone screen detection device based on machine vision according to claim 1, characterized in that: Strip light sources are also installed around the inner wall of the detection hole (220), and the front and rear strip light sources have the same length, and the left and right strip light sources have the same length.

6. The full-screen mobile phone screen detection method based on machine vision according to any one of claims 1 to 5, characterized in that: The following steps are included: Step 1: Divide the front of the full-screen phone into four areas: A, B, C, and D; Step 2: Divide the back of the full-screen phone into four areas: E, F, G, and H; Step 3: The first machine vision detection component (710) and the second machine vision detection component (720) detect four areas A, B, C, and D on the front of the full-screen mobile phone, and calculate the distance from the LCD screen to the frame of the mobile phone; Step 4: The third machine vision detection component (730) and the fourth machine vision detection component (740) detect four areas E, F, G, and H on the back of the full-screen mobile phone, and calculate the distance from the backlight panel to the mobile phone frame; Step 5: Calculate the difference between the distance from the LCD screen to the phone frame and the distance from the backlight panel to the phone frame to obtain the distance from the LCD screen frame to the backlight panel frame.

7. The full-screen mobile phone screen detection method based on machine vision as claimed in claim 6, characterized in that: It also includes the following steps: S1: placing a full-screen mobile phone in a mobile phone placement tool (450) of a front and rear motion assembly (400); S2: the front-rear moving assembly (400) moves to a first detection position; S3: Take pictures of the front of the full-screen phone from above, and take pictures of the back of the full-screen phone from below; S4: the forward and backward movement assembly (400) continues to move to a second detection position; S5: Take a photo of the front of the full-screen phone from above, and take a photo of the back of the full-screen phone from below; S6: Computer image processing software processes the image and calculates the result.

Images