A display detection device and method based on visual detection

Abstract

The present invention relates to the field of display detection technology, and more specifically discloses a display detection device and method based on visual detection, including a base component, the base component includes a first base, the top of the first base is fixedly connected to a top plate, the top of the first base is provided with a first middle groove and a second side groove, the interior of the first middle groove is provided with a transmission component, the transmission component includes a first motor and a first screw rod, the outer side of the first screw rod is provided with a translation component, and the bottom of the top plate is provided with a light source component and a detection component; the present invention is provided with a light source component and a translation component, so that the bottom of the light-emitting board is conducive to emitting a parallel light beam on the display screen, the light is reflected by the surface of the display screen and absorbed by the detection component and the landing point position is calculated, and the thickness change value of the display screen is converted and expanded into a distance difference by calculation, so as to realize high-precision detection of the thickness of the display screen.

Description

Technical Field

[0001] The present invention relates to the technical field of display detection, and more specifically to a display detection device and method based on visual detection. Background Art

[0002] A display (display, screen) is an I / O device of a computer, that is, an input and output device. It is a display tool that displays certain electronic files on the screen through a specific transmission device and then reflects them to the human eye. Existing displays usually consist of an electronic display screen and a bracket. During the production stage, QA testing of the display screen is extremely necessary to ensure the stability of the produced products.

[0003] The Chinese invention patent with publication number CN106841990A discloses a display screen detection device, comprising: a carrier, a pressure head, a sensor detection unit and an electrical detection unit; the carrier is used to place the display screen to be tested; the pressure head is arranged at one end of the carrier; the sensor detection unit comprises: a circuit board and a touch screen tester, the circuit board is arranged on the first surface of the pressure head; the touch screen tester is electrically connected to the circuit board; the electrical detection unit comprises: a probe, a backlight source, a lower polarizer and an upper polarizer, one end of the probe is arranged on the first surface of the pressure head, and the other end of the probe protrudes from the first surface of the pressure head; the device of the present invention can perform sensor detection and electrical detection at the same time by arranging both a circuit board and a probe on the pressure head, thereby improving work efficiency.

[0004] It can be seen that at present, in the detection process of the display screen, it is usually necessary to fix the edge of the display screen with a pressure plate and then detect various parameters of the display screen. In the thickness detection stage, the existing detection device adopts the method of pressing down the probe for detection. This contact detection method is not only easy to cause secondary pollution to the surface of the product, but also cannot accurately analyze the surface uniformity and defect location of the display screen. In addition, since the display screen needs to be shielded during brightness detection, the existing detection device is usually unable to meet the requirements of automated positioning and detection processes. During detection, it is usually necessary to manually use a light shielding hood or a dark room to achieve a high light-shielding effect. The operation process is relatively cumbersome and is not conducive to use in continuous production. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a display detection device and method based on visual detection to solve the problems existing in the above-mentioned background technology.

[0006] The present invention provides the following technical solutions: a display detection device and method based on visual detection, comprising a base assembly, the base assembly comprising a first base, a top plate fixedly connected to the top of the first base, a first middle groove and a second side groove opened on the top of the first base, a transmission assembly installed inside the first middle groove, the transmission assembly comprising a first motor and a first screw rod, a translation assembly installed on the outside of the first screw rod, a light source assembly and a detection assembly installed at the bottom of the top plate, a darkroom assembly installed on the top of the first base located on the left side of the top plate, an opening and closing assembly installed on the side of the darkroom assembly, the opening and closing assembly connected to a one-way assembly through a belt, the one-way assembly installed on the top of the first base, a reciprocating assembly installed inside the second side groove, and the other end of the reciprocating assembly installed at the bottom of the one-way assembly;

[0007] The detection module includes a thickness detection unit and a brightness detection unit, and the thickness detection unit includes an angle detection unit, a range detection unit and a displacement detection unit, wherein the angle detection collects angle information through an angle sensor at the detection module, which is used to control the angle position of the detection component so that it always maintains the corresponding light collection angle, the range detection unit is used to determine whether the display screen surface is curved in the first step, the displacement detection unit is used to collect the light beam landing position, collect the maximum thickness point to form a first position quantity, and collect the minimum thickness point to form a second position quantity, and the brightness detection unit includes a uniformity detection unit and a brightness value detection unit;

[0008] The transmission gear is provided with a double thread groove, and rod bevel blocks are installed at both ends of the second moving rod, and a spur gear is installed in the middle of the second moving rod, and the spur gear and the thread groove are meshed to form a worm mechanism. A plurality of side pressure rods are installed on the side of the placement groove at the top of the moving frame, and the side pressure rods include a pressure rod main rod and a second spring, and the top and the middle of the pressure rod main rod are respectively fixedly connected with an upper pressure block and a spring stop ring, and the second spring is installed at the bottom of the spring stop ring, and a rod bevel groove is opened at the bottom of the pressure rod main rod, and the rod bevel block is located inside the rod bevel groove and is installed on the second moving rod by thread, and a side tooth plate is fixedly connected to the side of the top of the moving frame, and a side bevel groove is opened at one end of the side tooth plate, and a pressure sensor is installed at the bottom of the spring stop ring, and the pressure sensor is used to detect the real-time pressure of the second spring.

[0009] Furthermore, the light source assembly includes a first gear, a second gear and a third gear, the two sides of the second gear are respectively meshed with the first gear and the third gear, a cleaning assembly is installed between the two second gears, a cleaning roller is installed between the two third gears, a light-emitting panel is installed on the top of the first gear, and detection modules are installed on both sides of the top of the light-emitting panel, an angle sensor is installed inside the detection module, the angle sensor is used to collect angle information of the light-emitting panel, and the detection module transmits it to the control module through an electrical signal to adjust the rotation angle of the detection assembly.

[0010] Furthermore, the cleaning assembly includes a cleaning box, a cylindrical cam rod and an inter-position brush are installed inside the cleaning box, both ends of the cylindrical cam rod are installed on the third gear, a cylindrical cam is installed on the outside of the cylindrical cam rod, and multiple groups of brushes are installed on the outside of the inter-position brush. The inside of the cleaning box is fixedly connected to a box body support rod, a reciprocating spring is installed on the outside of the box body support rod, brush side round rods are installed on both sides of the inter-position brush, and an air suction pipe is installed inside the cleaning box.

[0011] Furthermore, the darkroom assembly includes a darkroom box, a CCD camera and a brightness sensitive plate are installed on the top of the darkroom box, and the opening and closing assembly includes an opening and closing door, a second pulley is installed at both ends of the opening and closing door, the second pulley is connected to the first pulley through a belt, and a ratchet is installed inside the second pulley.

[0012] Furthermore, the reciprocating assembly includes a first square plate, the side of the first square plate is fixedly connected to a second square rod and a movable pressure rod, a third spring is installed on the outer side of the second square rod, a one-way stop groove is opened at one end of the second square rod, the one-way stop groove is composed of an elastic block and an inclined groove, and a power supply contact is installed on the outer side of the movable pressure rod.

[0013] Furthermore, the one-way component includes a one-way rod, both ends of which are fixedly connected to a fourth gear and a one-way ratchet, an outer key of the one-way rod is connected to a first pulley, and the first pulley is connected to a second pulley via a belt.

[0014] Furthermore, a third motor is installed on the side of the detection component, and the third motor is a servo motor, and its rotation angle is controlled by the control module. A detection photosensitive plate is installed at the bottom of the detection component, and the detection photosensitive plate determines the thickness value and surface curvature of the display screen by collecting position information of reflected light.

[0015] A display detection method based on visual detection comprises the following steps:

[0016] S1: Use an external mechanical arm to place the display screen to be tested on the placement slot, start the second motor, and the transmission rod of the second motor rotates to drive the second movable rod to rotate through the worm mechanism. The rotation of the second movable rod causes the side pressure rod to descend, and the pressure sensor transmits pressure information to the control module so that the edge of the upper pressure block applies constant pressure to the display screen, thereby realizing a standard pressure environment for thickness detection;

[0017] S2: Start the first motor, the first motor drives the first screw rod to rotate, the entire translation assembly moves to the left under the action of the first screw rod, the edge of the side inclined groove contacts the edge of the first gear, the first gear rises and meshes with the side gear plate, and the cleaning roller shaft descends to the upper surface of the display screen on the placement groove;

[0018] Surface cleaning: On the side of the light source assembly, the side gear plate drives the cleaning roller shaft to rotate, and the cleaning roller shaft removes the dirt on the surface of the display screen. At the same time, the rotation of the second gear causes the brush side round rod to reciprocate, automatically removing the dirt on the surface of the cleaning roller shaft;

[0019] S3: At the bottom of the light source assembly, the bottom of the light-emitting board emits a parallel light beam to illuminate the display screen. The light is reflected by the surface of the display screen and absorbed by the detection assembly to calculate the landing point position;

[0020] Darkroom formation: the translation assembly continues to move, the fourth gear meshes with the side tooth plate, and the fourth gear, under the meshing action of the side tooth plate, drives the opening and closing assembly to rotate upward through the first pulley and the belt to automatically open the opening and closing door. After the translation assembly enters the interior of the darkroom assembly, it pushes the moving pressure rod to the left, and the one-way stop groove loses the lock on the first pulley. At this time, the one-way assembly is driven to rotate in the opposite direction under the gravity of the opening and closing door, so that the opening and closing door can achieve sealing of the interior of the darkroom assembly;

[0021] S4: After the sealing is completed, the power-on device installed on the left side of the reciprocating assembly charges the display screen by moving the pressure rod to perform brightness detection. The CCD camera and the brightness sensitive plate on the top complete the brightness detection process by detecting and calculating the grayscale value of the display screen.

[0022] Technical effects and advantages of the present invention:

[0023] The present invention is provided with a light source component and a translation component, which is conducive to the bottom of the light-emitting board emitting a parallel light beam to illuminate the display screen. The light is reflected by the surface of the display screen and absorbed by the detection component to calculate the landing point position. The thickness change value of the display screen is converted and expanded into a distance difference by calculation, so as to achieve high-precision detection of the thickness of the display screen. The present invention is provided with a cleaning component and a cleaning roller shaft, which is conducive to the side tooth plate driving the first gear to rotate, and the rotation torque is transmitted to the third gear through the second gear. The cleaning roller shaft automatically removes the surface dirt of the display screen to avoid unnecessary errors in subsequent thickness and optical detection. The present invention is provided with a darkroom component and an opening and closing component, which is conducive to the engagement of the fourth gear with the side tooth plate. Under the meshing action of the side tooth plate, the fourth gear drives the opening and closing component to rotate upward through the first pulley and the belt to automatically open the opening and closing door, and automatically closes after the translation component enters, forming a highly closed darkroom space, which is conducive to more accurate brightness detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0026] Figure 3 The appended Figure 2 Schematic diagram of the structure of A.

[0027] Figure 4 It is a schematic diagram of the structure of the light source assembly of the present invention.

[0028] Figure 5 It is a cross-sectional view of the cleaning component structure of the present invention.

[0029] Figure 6 It is a schematic diagram of the structure of the translation assembly of the present invention.

[0030] Figure 7 It is a cross-sectional view of the translation assembly structure of the present invention.

[0031] Figure 8 It is a schematic diagram of the side pressure rod structure of the present invention.

[0032] Fig. 9 It is a schematic diagram of the structure of the reciprocating assembly of the present invention.

[0033] Fig.10 It is a schematic diagram of the one-way component structure of the present invention.

[0034] Fig.11 It is an overall flow chart of the plane thickness and brightness detection method of the present invention.

[0035] Fig.12 It is a flow chart of the plane thickness and curvature detection method of the present invention.

[0036] Fig.13 This is an initial position relationship diagram of the thickness detection process of the present invention.

[0037] Fig.14 It is a relative position relationship diagram during the thickness detection process of the present invention.

[0038] The accompanying drawings are marked as follows: 1. base assembly; 101. first base; 102. first middle groove; 103. second side groove; 104. top plate; 2. light source assembly; 201. first gear; 202. second gear; 203. cleaning assembly; 2031. cleaning box; 2032. cylindrical cam rod; 2033. intermediate brush; 2034. reciprocating spring; 2035. box support rod; 2036. brush side round rod; 204. third gear; 205. cleaning roller shaft; 206. light-emitting board; 207. detection module; 3. detection assembly; 4. translation assembly; 401. moving frame; 402. placement groove; 403. spiral hole; 404. second motor; 405. side pressure rod; 4051. pressure rod main rod; 4052. upper pressure rod Block; 4053, spring stop ring; 4054, second spring; 4055, rod bevel groove; 406, side tooth plate; 407, side bevel groove; 408, second moving rod; 409, rod bevel block; 5, transmission assembly; 501, first motor; 502, first screw rod; 6, one-way assembly; 601, one-way rod; 602, fourth gear; 603, first pulley; 604, one-way ratchet; 7, reciprocating assembly; 701, first square plate; 702, second square rod; 703, third spring; 704, moving pressure rod; 705, one-way stop groove; 8, darkroom assembly; 801, darkroom box; 802, CCD camera; 803, brightness sensitive plate; 9, opening and closing assembly; 901, second pulley; 902, opening and closing door; 10, belt. DETAILED DESCRIPTION

[0039] The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The display detection device and method based on visual detection involved in the present invention are not limited to the various structures described in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0040] Reference Figure 1 and Figure 2The present invention provides a display detection device and method based on visual detection, including a base component 1, the base component 1 includes a first base 101, the top of the first base 101 is fixedly connected to a top plate 104, the top of the first base 101 is provided with a first middle groove 102 and a second side groove 103, a transmission component 5 is installed inside the first middle groove 102, the transmission component 5 includes a first motor 501 and a first screw rod 502, a translation component 4 is installed on the outer side of the first screw rod 502, a light source component 2 and a detection component 3 are installed at the bottom of the top plate 104, a darkroom component 8 is installed on the top of the first base 101 and located on the left side of the top plate 104, an opening and closing component 9 is installed on the side of the darkroom component 8, the opening and closing component 9 is connected to the one-way component 6 through a belt 10, the one-way component 6 is installed on the top of the first base 101, a reciprocating component 7 is installed inside the second side groove 103, and the other end of the reciprocating component 7 is installed at the bottom of the one-way component 6.

[0041] In this embodiment, it is necessary to specifically explain that: a third motor is installed on the side of the detection component 3, and the third motor is a servo motor, and its rotation angle is controlled by the control module. A detection photosensitive plate is installed at the bottom of the detection component 3. The detection photosensitive plate determines the thickness value and surface curvature value of the display screen by collecting the position information of the reflected light. When the thickness is detected, the parallel light beam is irradiated on the display screen through the bottom of the light-emitting plate 206 and reflected to the detection component 3. The difference between the inclination angle of the detection photosensitive plate and the angle of the light beam reflection line is 1°. It is necessary to explain again here that according to the reflection principle, when the incident angle is 5 degrees and the angle between the photosensitive plate and the reflection angle is 1 degree, the height difference and the distance difference on the detection photosensitive plate are 9.987, which is recorded as 10. That is, in the detection process at this time, for every unit length increase in the thickness of the display screen, the landing point of the light on the detection photosensitive plate moves ten unit lengths. The thickness amplification effect of this detection method makes the detection result more accurate. Similarly, when the angle is reduced to 0.1 degrees, the amplification ratio is 1:100, and the detection is more accurate.

[0042] In this embodiment, it is necessary to explain again the thickness detection process described above. Fig.13 and 14 The thickness detection process is divided into two stages, namely standard thickness detection and thickness change detection. During standard thickness detection, the actual thickness is calculated by detecting the distance between the position of the light reflection point X1 and the standard position. The principle is that when the thickness of the object to be detected increases, the movement of the reflection position causes the landing point on the photosensitive plate to change from X1 to X2. According to the basic triangle principle, the calculation formula is:

[0043] , where θ1 refers to the incident angle; θ2 refers to the angle between the photosensitive plate and the reflected light, and its preferred angle range is 0.1-1 degrees; h is the thickness variable of the display screen; X1 and X2 are the two landing points of the light respectively;

[0044] It can be seen that the thickness variable of the display screen is directly proportional to the displacement of the photosensing point. During detection, by adjusting the value of θ2, the ratio between the two can be adjusted to control the accuracy of detection.

[0045] The θ1 of 5 degrees adopted in the above-mentioned embodiment is one of the preferred embodiments, not the only value. For different display screen thicknesses, installation heights of the translation assembly 4 and actual lengths of the light source assembly 2, the specific value of θ1 is not the same in actual use. At the same time, due to the vibration effect of gear meshing, the value of θ1 will inevitably be unstable and change up and down during detection. The present application installs an angle sensor inside the detection module 207 to eliminate the influence of vibration on the value during detection. For a computer, it is not difficult to calculate a two-variable formula. In addition, the installation method of the angle sensor, its angle calculation method and the related signal transmission method are all existing technologies, which are easy for people in this field to understand and apply, so the present application does not make specific limitations here.

[0046] The main difference between this embodiment and the prior art is that in this embodiment, the enlargement effect of optical reflection is used to realize the automatic detection of the thickness of the display screen, and the gear meshing relationship is used to realize the automatic opening and closing of the darkroom, thereby increasing the accuracy of the brightness detection, and the angle change is used to realize the surface cleaning of the display screen to be detected, specifically, the light source assembly 2, the detection assembly 3, the translation assembly 4, and the darkroom assembly 8;

[0047] The above structure is the main structure of this embodiment, which solves the problem of low thickness detection accuracy of the current display screen, and also solves the problem of complicated surface cleaning procedures during current detection. The sensor is an existing structure, and the specific structure and connection method of the sensor are not described in detail in this embodiment.

[0048] Reference Figure 2-3The darkroom assembly 8 includes a darkroom box 801, and a CCD camera 802 and a brightness photosensitive plate 803 are installed on the top of the darkroom box 801. After the display screen enters the darkroom assembly 8, it starts to be powered on to perform a brightness detection process, and the brightness value information is detected through a three-color monochrome display result. The opening and closing assembly 9 includes an opening and closing door 902, and second pulleys 901 are installed at both ends of the opening and closing door 902. The second pulley 901 is connected to the first pulley 603 through a belt 10, and a ratchet is installed inside the second pulley 901. When the one-way assembly 6 starts to rotate forward under the action of the side tooth plate 406, the opening and closing door 902 opens to the right to facilitate the translation assembly 4 to enter the interior. When the translation assembly 4 enters the interior of the darkroom assembly 8 and presses the moving pressure rod 704, the second square rod 702 moves to the left. At this time, the opening and closing door 902 drives the first pulley 603 to rotate in the opposite direction under the action of gravity, so that it completes the sealing of the interior of the darkroom assembly 8 under the action of its own gravity.

[0049] In this embodiment, it is necessary to specifically explain that: when the translation component 4 is in the return stage, the movable frame 401 is used to reversely push the opening and closing door 902 to rotate and open the sealed space. At this time, the opening and closing door 902 does not have a blocking effect. Since a ratchet is installed inside the second pulley 901, when the opening and closing door 902 drives the second pulley 901 to rotate in the reverse direction, it will not cause the one-way component 6 to rotate, thereby causing the reciprocating component 7 to be displaced under the rotation of the one-way component 6.

[0050] Reference Figure 4-5 The light source assembly 2 includes a first gear 201, a second gear 202 and a third gear 204. The two sides of the second gear 202 are respectively meshed with the first gear 201 and the third gear 204. A cleaning assembly 203 is installed between the two second gears 202, and a cleaning roller shaft 205 is installed between the two third gears 204. A light-emitting board 206 is installed on the top of the first gear 201. Detection modules 207 are installed on both sides of the top of the light-emitting board 206. An angle sensor is installed inside the detection module 207. The angle sensor is used to collect angle information of the light-emitting board 206. The detection module 207 transmits it to the control module through an electrical signal to adjust the rotation angle of the detection assembly 3 so that it always maintains a fixed angle difference.

[0051] In this embodiment, it is necessary to specifically explain that the cleaning assembly 203 includes a cleaning box 2031, a cylindrical cam rod 2032 and an intermediate brush 2033 are installed inside the cleaning box 2031, both ends of the cylindrical cam rod 2032 are installed on the third gear 204, a cylindrical cam is installed on the outer side of the cylindrical cam rod 2032, and multiple groups of brushes are installed on the outer side of the intermediate brush 2033. The interior of the cleaning box 2031 is fixedly connected to a box support rod 2035, and a reciprocating spring 203 is installed on the outer side of the box support rod 2035. 4. Brush side round rods 2036 are installed on both sides of the intermediate brush 2033, and an air suction pipe is installed inside the cleaning box 2031. When the third gear 204 rotates, the cylindrical cam applies pressure to the brush side round rod 2036 to make the intermediate brush 2033 reciprocate. The brush removes the dirt adsorbed by the cleaning roller shaft 205 from its surface, and collects it into the cleaning box 2031 in combination with the air suction pipe, thereby cleaning the cleaning roller shaft 205, so that it can be effectively cleaned after each rotation, and the dirt is prevented from returning to the surface of the display screen.

[0052] refer to Fig.13 and Fig.14 It is obvious that the cleaning roller shaft 205 is at a right angle to the bottom of the first gear 201. When the bottom of the first gear 201 is tilted, the height of the cleaning roller shaft 205 will be reduced, and the cleaning roller shaft 205 will be reduced from the first height position to the second height position. It should be specifically noted that since the edge of the cleaning roller shaft 205 is made of soft material, its descending height does not require a precise height value. Regardless of whether it is due to the thickness of the display screen or the vibration caused by the gear meshing, the height change will not affect the cleaning effect, and will not cause scratches on the surface of the display screen.

[0053] Reference Figure 6-8The translation assembly 4 includes a moving frame 401, a placement slot 402 is provided on the top of the moving frame 401, a spiral hole 403 is provided on the side of the moving frame 401, a second motor 404 and a second moving rod 408 are installed inside the moving frame 401, the second motor 404 is composed of a motor and a transmission rod, a double thread groove is provided on the transmission rod, a rod oblique block 409 is installed at both ends of the second moving rod 408, a spur gear is installed in the middle of the second moving rod 408, and the spur gear meshes with the thread groove to form a worm mechanism, a plurality of side pressure rods 405 are installed on the side of the placement slot 402 at the top of the moving frame 401, and the side pressure rods 405 include a pressure rod main rod 4051 and a second spring 4054 The top and the middle of the pressure rod main rod 4051 are respectively fixedly connected with an upper pressure block 4052 and a spring stop ring 4053, the second spring 4054 is installed at the bottom of the spring stop ring 4053, and a rod inclined groove 4055 is provided at the bottom of the pressure rod main rod 4051. The rod inclined block 409 is located inside the rod inclined groove 4055 and is installed on the second moving rod 408 by threads. The side of the top of the moving frame 401 is fixedly connected with a side tooth plate 406, and one end of the side tooth plate 406 is provided with a side inclined groove 407. In the fixing stage, the second motor 404 rotates to move the worm mechanism, thereby causing the rod inclined block 409 to move to both sides to cause the side pressure rod 405 to descend, thereby fixing the display screen.

[0054] In this embodiment, it should be specifically explained that a pressure sensor is installed at the bottom of the spring stop ring 4053, and the pressure sensor is used to detect the real-time pressure of the second spring 4054 to ensure that the pressure of the upper pressure block 4052 on the display screen is always in a constant state.

[0055] Reference Fig. 9 The reciprocating assembly 7 includes a first square plate 701, a second square rod 702 and a movable pressure rod 704 are fixedly connected to the side of the first square plate 701, a third spring 703 is installed on the outer side of the second square rod 702, and a one-way stop groove 705 is opened at one end of the second square rod 702. The one-way stop groove 705 is composed of an elastic block and an inclined groove. In the opening stage of the opening and closing door 902, the first pulley 603 continuously presses down the elastic block to make the opening and closing door 902 open normally, and will not drive the first pulley 603 to move in the reverse direction under the action of its own gravity.

[0056] In this embodiment, it should be specifically explained that: a power supply contact is installed on the outer side of the movable pressure rod 704, and when the movable frame 401 applies pressure to the movable pressure rod 704, the movable pressure rod 704 powers on the display screen to perform a brightness detection process.

[0057] Reference Fig.10 The one-way component 6 includes a one-way rod 601, and the two ends of the one-way rod 601 are respectively fixedly connected to the fourth gear 602 and the one-way ratchet 604, and the outer key of the one-way rod 601 is connected to the first pulley 603, and the first pulley 603 is connected to the second pulley 901 through the belt 10.

[0058] In the present embodiment, it should be specifically explained that the one-way ratchet 604 cannot rotate in the opposite direction when the one-way stop groove 705 is at the bottom, so that in the second half of the translation assembly 4 entering the darkroom assembly 8, that is, after the side tooth plate 406 is out of contact with the fourth gear 602, the opening and closing door 902 is still in the open state, and the impact process of the moving pressure rod 704 after entering the interior automatically forms a darkroom condition inside.

[0059] Reference Figure 11-12 The detection module 207 includes a thickness detection unit and a brightness detection unit. The thickness detection unit includes an angle detection unit, a range detection unit and a displacement detection unit. The angle detection collects angle information through the angle sensor at the detection module 207, which is used to control the angle position of the detection component 3 so that it always maintains the corresponding light collection angle. The range detection unit is used to determine whether the display surface is curved in the first step. The displacement detection unit is used to collect the position of the light beam landing point, collect the maximum thickness point to form the first position quantity, and collect the minimum thickness point to form the second position quantity.

[0060] In the process of thickness detection, the position information of the light beam is first collected by the displacement detection unit. During the collection of position parameters, the range detection unit is used to analyze the light beam value collected each time. When the range is greater than the threshold, it is judged that there is bending in the plane here, and then the light beam is divided into multiple segments. The parameters of each beam segment are recalculated. By calculating the curvature of each segment, it is judged that a surface defect occurs here when the parameter is greater than the threshold. At this time, the electrical signal displays the position and curvature of the defect through the display; when no surface bending defect occurs, after the detection is completed, the maximum thickness position is marked as the first position quantity, and the minimum thickness position is marked as the second position quantity. The average thickness of the plane is calculated by the angle value, and the deviation between the actual thickness value and the standard thickness value is calculated. After the detection is completed, the actual thickness value and the plane deviation are displayed on the display.

[0061] Working principle of the present invention:

[0062] The main problems solved by this embodiment are: utilizing the magnification effect of optical reflection to realize automatic detection of the thickness of the display screen, and utilizing the gear meshing relationship to realize automatic opening and closing of the darkroom, thereby increasing the accuracy of brightness detection, and utilizing angle changes to realize surface cleaning of the display screen to be detected, thereby avoiding the influence of dirt on detection errors, thereby solving the problem of low accuracy of thickness detection of the current display screen, and also solving the problem of complicated surface cleaning procedures during current detection.

[0063] The specific steps are as follows:

[0064] S1: Use an external mechanical arm to place the display screen to be tested on the placement slot 402, start the second motor 404, and the transmission rod of the second motor 404 rotates to drive the second movable rod 408 to rotate through the worm mechanism. The rotation of the second movable rod 408 causes the rod inclined block 409 to move to both sides and enter the rod inclined slot 4055 to apply pressure thereto so that the side pressure rod 405 descends. When the side pressure rod 405 descends, the spring stop ring 4053 moves downward to cause the second spring 4054 to continuously contract, and the pressure of the second spring 4054 continuously increases. The pressure sensor transmits pressure information to the control module so that the edge of the upper pressure block 4052 applies a constant pressure to the display screen each time, so as to achieve a standard environment for thickness detection;

[0065] S2: When the pressure reaches the threshold, the second motor 404 is stopped and the first motor 501 is started. The first motor 501 drives the first screw rod 502 to rotate. Since the first screw rod 502 is installed inside the screw hole 403, when the first screw rod 502 rotates, the entire translation assembly 4 moves to the left under the action of the first screw rod 502. During the movement of the translation assembly 4, the edge of the side inclined groove 407 first contacts the edge of the first gear 201, so that the light source assembly 2 as a whole is tilted and rotated along the center position of the detection module 207 and rises. After the first gear 201 rises to the vertex, it meshes with the side gear plate 406. At this time, since the cleaning roller shaft 205 is installed on the side of the first gear 201 and the initial height is higher than the first gear 201, when the rotation causes the first gear 201 to rise, the cleaning roller shaft 205 rotates with the first gear 201 and the position height is reduced. After the first gear 201 rises to the vertex and meshes with the light-emitting board 206, the cleaning roller shaft 205 descends to the upper surface of the display screen on the placement groove 402. At this time, the inclination angle of the light-emitting board 206 is 5 degrees.

[0066] Surface cleaning: After the first gear 201 completes the rotation and tilt change, at the side of the light source assembly 2, as the translation assembly 4 continues to move, the side tooth plate 406 drives the first gear 201 to start rotating, and the rotational torque is transmitted to the third gear 204 through the second gear 202. Since the cleaning roller shaft 205 is on the surface of the display screen and the edge linear velocity of the cleaning roller shaft 205 is greater than the moving speed of the translation assembly 4, the cleaning roller shaft 205 removes the surface dirt of the display screen to avoid unnecessary errors in subsequent thickness and optical detection. At the same time, the rotation of the second gear 202 also causes the cylindrical cam rod 2032 to rotate synchronously. Since a cylindrical cam is installed on the outer side of the cylindrical cam rod 2032, the rotation of the cylindrical cam rod 2032 pushes the brush side round rod 2036 to reciprocate once per rotation. The reciprocating spring 2034 provides a stabilizing effect so that the intermediate brush 2033 always has a tendency to move toward the middle, reducing the vibration intensity generated during reciprocation and reducing the impact of fatigue stress.

[0067] S3: At the same time, at the bottom of the light source assembly 2, when the translation assembly 4 continuously moves past the bottom of the light-emitting board 206, the bottom of the light-emitting board 206 emits a parallel light beam to illuminate the display screen. As the reflection proceeds, the light is reflected by the surface of the display screen and absorbed by the detection assembly 3 to calculate the landing point position. At this time, the angle between the detection assembly 3 and the horizontal plane is between 84 degrees and 84.9 degrees. It can be seen from the embodiment that when the angle of the detection assembly 3 is the former, the distance difference between the two reflective points is one hundred times the rising distance of the display screen. When the angle of the detection assembly 3 is the latter, the distance of the reflective point on the detection assembly 3 changes by ten times. This detection process is to convert and expand the thickness change value of the display screen into a distance difference by adjusting the inclination change of the detection assembly 3, so as to perform high-precision detection and calculation. At the same time, the angle sensor inside the detection module 207 detects the real-time angle value of the light-emitting board 206 to transmit an electrical signal to the control module, which is used to control the detection assembly 3 to adjust the inclination size to recalculate the thickness value size, thereby reducing the vibration calculation deviation caused by the meshing between the side tooth plate 406 and the first gear 201;

[0068] Darkroom formation: After the thickness detection, the translation assembly 4 continues to move, at which time the fourth gear 602 is meshed with the side tooth plate 406. Under the meshing action of the side tooth plate 406, the fourth gear 602 drives the opening and closing assembly 9 to rotate upward through the first pulley 603 and the belt 10 to automatically open the opening and closing door 902. After the translation assembly 4 enters the interior of the darkroom assembly 8, it pushes the moving pressure rod 704 to the left, and the reciprocating assembly 7 moves to the left as a whole. The one-way stop groove 705 loses the lock on the first pulley 603. At this time, the one-way assembly 6 is driven to rotate in the opposite direction under the gravity of the opening and closing door 902, so that the opening and closing door 902 can achieve the sealing of the interior of the darkroom assembly 8;

[0069] S4: After the sealing is completed, the power supply device installed on the left side of the reciprocating assembly 7 charges the display screen by moving the pressure rod 704 to perform brightness detection, and the CCD camera 802 and the brightness photosensitive plate 803 on the top detect and calculate the gray value of the display screen to realize the brightness detection process;

[0070] After the detection is completed, the first motor 501 is started to rotate in the reverse direction, and after the display screen moves to the initial position, the second motor 404 is started to rotate in the reverse direction, and the robot arm removes the display screen to complete the detection process.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A display inspection device based on visual inspection, comprising a base assembly (1), characterized in that: The base assembly (1) comprises a first base (101), the top of the first base (101) is fixedly connected to a top plate (104), the top of the first base (101) is provided with a first middle groove (102) and a second side groove (103), a transmission assembly (5) is installed inside the first middle groove (102), the transmission assembly (5) comprises a first motor (501) and a first screw rod (502), a translation assembly (4) is installed outside the first screw rod (502), and a light source assembly (4) is installed at the bottom of the top plate (104). The light source assembly (2) comprises a detection module (207); a darkroom assembly (8) is installed on the top of the first base (101) and located on the left side of the top plate (104); an opening and closing assembly (9) is installed on the side of the darkroom assembly (8); the opening and closing assembly (9) is connected to the one-way assembly (6) via a belt (10); the one-way assembly (6) is installed on the top of the first base (101); a reciprocating assembly (7) is installed inside the second side groove (103); one end of the reciprocating assembly (7) is installed on the bottom of the one-way assembly (6); The detection module (207) comprises a thickness detection unit and a brightness detection unit, wherein the thickness detection unit comprises an angle detection unit, a range detection unit and a displacement detection unit, wherein the angle detection unit collects angle information through an angle sensor at the detection module (207) and is used to control the angle position of the detection component (3) so that it always maintains a corresponding light collection angle, the range detection unit is used to determine whether the display screen surface is curved in the first step, the displacement detection unit is used to collect the light beam landing point position, collect the maximum thickness point to form a first position quantity, and collect the minimum thickness point to form a second position quantity, and the brightness detection unit comprises a uniformity detection unit and a brightness value detection unit; The translation assembly (4) comprises a moving frame (401), a placement slot (402) is provided on the top of the moving frame (401), a spiral hole (403) is provided on the side of the moving frame (401), a second motor (404) and a second moving rod (408) are installed inside the moving frame (401), the second motor (404) comprises a motor and a transmission rod, a double thread groove is provided on the transmission rod, rod inclined blocks (409) are installed at both ends of the second moving rod (408), a spur gear is installed in the middle of the second moving rod (408), the spur gear meshes with the thread groove to form a worm mechanism, a plurality of side pressure rods (405) are installed on the top of the moving frame (401) on the side of the placement slot (402), the side pressure rods (405) comprise a pressure rod main rod (4051 ) and a second spring (4054), the top and middle of the pressure rod main rod (4051) are respectively fixedly connected with an upper pressure block (4052) and a spring stop ring (4053), the second spring (4054) is installed at the bottom of the spring stop ring (4053), the bottom of the pressure rod main rod (4051) is provided with a rod inclined groove (4055), the rod inclined block (409) is located inside the rod inclined groove (4055) and is installed on the second moving rod (408) through a thread, the side surface of the top of the moving frame (401) is fixedly connected with a side tooth plate (406), one end of the side tooth plate (406) is provided with a side inclined groove (407), and the bottom of the spring stop ring (4053) is installed with a pressure sensor, and the pressure sensor is used to detect the real-time pressure of the second spring (4054); The light source assembly (2) comprises a first gear (201), a second gear (202) and a third gear (204); the two sides of the second gear (202) are respectively meshed with the first gear (201) and the third gear (204); a cleaning assembly (203) is installed between the two second gears (202); a cleaning roller shaft (205) is installed between the two third gears (204); a light-emitting board (206) is installed on the top of the first gear (201); detection modules (207) are installed on both sides of the top of the light-emitting board (206); an angle sensor is installed inside the detection module (207); the angle sensor is used to collect angle information of the light-emitting board (206); the detection module (207) transmits the angle information to the control module through an electrical signal to adjust the rotation angle of the detection assembly (3); A third motor is installed on the side of the detection component (3). The third motor is a servo motor, and its rotation angle is controlled by the control module. A detection photosensitive plate is installed at the bottom of the detection component (3). The detection photosensitive plate determines the thickness value and surface curvature of the display screen by collecting the position information of the reflected light. The thickness calculation formula is: , where θ1 refers to the incident angle; θ2 refers to the angle between the detection plate and the reflected light, and its angle range is 0.1-1 degree; h is the display thickness variable; X1 and X2 are the two landing points of the light respectively.

2. A display detection device based on visual detection according to claim 1, characterized in that: The cleaning assembly (203) comprises a cleaning box (2031), wherein a cylindrical cam rod (2032) and an inter-position brush (2033) are installed inside the cleaning box (2031), both ends of the cylindrical cam rod (2032) are installed on the third gear (204), a cylindrical cam is installed on the outside of the cylindrical cam rod (2032), and multiple groups of brushes are installed on the outside of the inter-position brush (2033), the inside of the cleaning box (2031) is fixedly connected to a box body support rod (2035), and a reciprocating spring (2034) is installed on the outside of the box body support rod (2035), brush side round rods (2036) are installed on both sides of the inter-position brush (2033), and an air suction pipe is installed inside the cleaning box (2031).

3. A display detection device based on visual detection according to claim 2, characterized in that: The darkroom component (8) comprises a darkroom box (801), a CCD camera (802) and a brightness photosensitive plate (803) are installed on the top of the darkroom box (801), and the opening and closing component (9) comprises an opening and closing door (902), and second pulleys (901) are installed at both ends of the opening and closing door (902), the second pulley (901) is connected to the first pulley (603) via a belt (10), and a ratchet is installed inside the second pulley (901).

4. The display detection device based on visual detection according to claim 3, characterized in that: The reciprocating assembly (7) comprises a first square plate (701), a second square rod (702) and a movable pressure rod (704) being fixedly connected to the side of the first square plate (701), a third spring (703) being installed on the outer side of the second square rod (702), a one-way stop groove (705) being provided at one end of the second square rod (702), the one-way stop groove (705) being composed of an elastic block and an inclined groove, and a power supply contact being installed on the outer side of the movable pressure rod (704).

5. The display detection device based on visual detection according to claim 4, characterized in that: The one-way component (6) comprises a one-way rod (601), two ends of which are respectively fixedly connected to a fourth gear (602) and a one-way ratchet (604), an outer key of the one-way rod (601) is connected to a first pulley (603), and the first pulley (603) is connected to a second pulley (901) via a belt (10).

6. A display detection method based on visual detection, based on the display detection device based on visual detection according to claim 5, characterized in that: The following steps are involved: S1: using an external mechanical arm to place the display screen to be tested on the placement slot (402), starting the second motor (404), the transmission rod of the second motor (404) rotates to drive the second movable rod (408) to rotate through the worm mechanism, the rotation of the second movable rod (408) causes the side pressure rod (405) to descend, and the pressure sensor transmits pressure information to the control module so that the edge of the upper pressure block (4052) applies constant pressure to the display screen, thereby achieving a standard pressure environment for thickness detection; S2: starting the first motor (501), the first motor (501) drives the first screw rod (502) to rotate, the entire translation assembly (4) moves to the left under the action of the first screw rod (502), the edge of the side inclined groove (407) contacts the edge of the first gear (201), the first gear (201) rises and meshes with the side tooth plate (406), and the cleaning roller shaft (205) descends to the upper surface of the display screen on the placement groove (402); Surface cleaning: On the side of the light source assembly (2), the side tooth plate (406) drives the cleaning roller shaft (205) to rotate, and the cleaning roller shaft (205) removes dirt from the surface of the display screen. At the same time, the rotation of the second gear (202) causes the brush side round rod (2036) to reciprocate, thereby automatically removing dirt from the surface of the cleaning roller shaft (205); S3: At the bottom of the light source assembly (2), the bottom of the light-emitting panel (206) emits a parallel light beam to illuminate the display screen, and the light is reflected by the surface of the display screen and absorbed by the detection assembly (3), and the landing point position is calculated; Darkroom formation: the translation assembly (4) continues to move, the fourth gear (602) meshes with the side tooth plate (406), and the fourth gear (602) drives the opening and closing assembly (9) to rotate upwards through the first pulley (603) and the belt (10) under the meshing action of the side tooth plate (406) to automatically open the opening and closing door (902). After the translation assembly (4) enters the interior of the darkroom assembly (8), it pushes the moving pressure rod (704) to the left, and the one-way stop groove (705) loses the lock on the first pulley (603). At this time, under the action of the gravity of the opening and closing door (902), the one-way assembly (6) is driven to rotate in the opposite direction, so that the opening and closing door (902) can achieve sealing of the interior of the darkroom assembly (8); S4: After the sealing is completed, the power supply device installed on the left side of the reciprocating assembly (7) charges the display screen by moving the pressure rod (704) to perform brightness detection, and the CCD camera (802) and the brightness photosensitive plate (803) on the top complete the brightness detection process by detecting and calculating the grayscale value of the display screen.

Images