CN102789752A - Visual detection system of LCD display screen - Google Patents

Abstract

The invention relates to a visual detection system of a large-size flat display screen. The visual detection system comprises a conveyor belt for conveying a display screen, and further comprises a display screen position correction mechanism and a visual test station, wherein the display screen position correction mechanism is provided with a first air cylinder and a correction frame driven by the first air cylinder, and four stop sensors are mounted on the correction frame; the vision testing station is provided with a workbench and a testing mechanism arranged on the workbench, and a movable darkroom cover is arranged on the workbench and outside the testing mechanism. The visual detection system of the invention is adopted to carry out visual detection on the large-size flat display screen, can ensure that the angle of the display screen is accurately positioned, has high positioning speed and is beneficial to improving the accuracy rate and the testing efficiency of the test; and the movable darkroom cover can construct a detection environment with uniform light brightness, so that the detection cannot be influenced by the brightness of the external environment, and the detection result is more accurate.

Description

A Visual Inspection System for LCD Display

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Technical field:

The invention belongs to the technical field of display screens, and relates to visual detection of large-size flat display screens, in particular to a visual detection system of large-size flat display screens.

Background technique:

Large-size flat-panel displays mainly refer to computer monitors and LCD TVs, including LCD and OLED. In the production of large-size flat-panel displays, it is necessary to conduct visual tests on the displays to detect whether there are defects in each pixel of the display, and to observe and judge whether the display can display images normally. The traditional production line is mainly inspected by human eyes, which may damage eyesight, cause fatigue easily, and thus cause missed and false detections, etc., which have great deficiencies in accuracy and efficiency, and damage the health of employees. The existing visual testing system mainly focuses on the development and design of core testing hardware and software, and rarely develops peripheral auxiliary equipment, so that the entire testing system has not yet formed a standardized and streamlined automatic operation. Therefore, the existing visual testing system There are big deficiencies in the accuracy and efficiency of the test.

Invention content:

The object of the present invention is to overcome the above-mentioned shortcomings of the existing visual inspection system for flat display screens, and provide an automatic visual inspection system for large-size flat display screens.

The technical solution adopted by the present invention to achieve its purpose is: a visual inspection system for a large-size flat display screen, the visual inspection system includes a conveyor belt for transmitting the display screen, the visual inspection system also includes a display screen position correction mechanism and a visual test station, wherein the display screen position correction mechanism has a first cylinder and a correction frame driven by the first cylinder, and four block sensors are installed on the correction frame; the visual test station has a workbench and a setting The test mechanism is on the workbench, and a movable darkroom cover is arranged on the workbench outside the test mechanism, and the movable darkroom cover is driven by the second air cylinder.

The test mechanism includes a slide rail frame arranged on the workbench and an x-direction slide table installed on the slide rail frame, and the x-direction slide table is driven by a first servo motor arranged in front of the slide rail frame; the x-direction The sliding table is equipped with a y-direction slide seat, and two sets of z-direction brackets are installed on the y-direction slide seat, and the z-direction support is driven by the second servo motor installed on the y-direction slide seat; each z-direction support is respectively installed with Test shot.

The two groups of z-direction brackets are driven by the positive and negative screw rods arranged in the y-direction slide seat through the second servo motor, and two test lenses are respectively arranged on the top and bottom of each group of z-direction brackets, that is, the four test lenses are in the form of rectangular distribution.

The large-size flat display screen visual inspection system of the present invention can use the display screen position correction mechanism to make the angle of the display screen in a vertical state, so that it can reach a unified test position, and then automatically enter the test station by the conveyor belt, and form a The visual test is automatically completed in a darkroom environment, and finally it is automatically sent to the unloading station, which can be unloaded manually. Therefore, using the visual detection system of the present invention to carry out visual detection of large-size flat display screens can ensure accurate angular positioning of the display screen and fast positioning speed, which is conducive to improving the accuracy and efficiency of testing; and the movable darkroom cover can build a light The detection environment with uniform brightness makes the detection not affected by the brightness of the external environment and makes the detection result more accurate.

Description of drawings:

Fig. 1 is the structural representation of automatic visual inspection system of the present invention;

Fig. 2 is a schematic structural view of another angle of the automatic visual inspection system of the present invention;

Fig. 3 is a structural schematic diagram of the testing mechanism in the present invention.

Detailed ways:

The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

As shown in FIGS. 1 and 2 , the visual inspection system for large-size flat display screens of the present invention includes a conveyor belt 1 for placing and transporting display screens, a display screen position correction mechanism 2 and a visual testing station 3 .

Specifically, the conveyor belt 1 is arranged in front of the display screen correction mechanism 2 and the vision test station 3, connects the two stations and plays the role of placing and transporting the display screens.

The display screen position correction mechanism 2 has a first cylinder 21 and a correction frame 22 driven by the first cylinder 21, and four block sensors 23 are installed on the correction frame 22; The conveyor belt 1 is in a vertical state; its four block sensors 23 are respectively located at the four corners of the calibration frame 22, distributed in a rectangle, and the block sensors 23 should be installed to ensure that they can touch the outer frame of the display screen at the same time.

Described vision testing station 3 has a workbench 31 and the test mechanism 32 that is arranged on the workbench 31, and on the workbench 31, the outside of test mechanism 32 is provided with a movable darkroom cover 33, and movable darkroom cover 33 has four A light-shielding surface is respectively an upper surface, two side surfaces and a rear surface, and the lower surface is slidably installed on the workbench 31, and the front surface is opened so that the belt detection display screen can be inserted into it for testing. The movable darkroom cover 33 can build a detection environment with uniform light brightness, so that the detection will not be affected by the brightness of the external environment, so that the detection result is more accurate.

As shown in Figure 3, described testing mechanism 32 comprises the slide rail frame 321 that is arranged on the workbench 31 and the x direction slide table 322 that is installed on the slide rail frame 321, x direction slide table 322 is arranged on the slide rail frame 321 is driven by the first servo motor 323 in front; the y-direction slide seat 324 is installed on the x-direction slide table 322, and two sets of z-direction brackets 325 are installed on the y-direction slide seat 324, and the z-direction bracket 325 is arranged on the y-direction The second servo motor 326 on the slide 324 is driven; each z-direction bracket 325 is respectively equipped with a test lens 327 .

The two groups of z-direction brackets 325 are driven by the positive and negative screw rods arranged in the y-direction slide 324 through the second servo motor 326, and two test lenses 327 are arranged up and down on each group of z-direction brackets 325, namely The four test shots 327 are distributed in a rectangular shape. The two groups of z-direction brackets 325 move in opposite directions, thereby adjusting the y-direction distance between the two groups of z-direction brackets 326, that is, the test lens 327 on them, plus the distance of the test lens 327 on the z-direction bracket 325 can pass through the installation hole and so on, so the size of the rectangular test range formed by the four test lenses 327 can be adjusted as required, so as to meet the requirements for testing display screens with different sizes.

When the correction mechanism of the present invention is corrected, the display screen 4 is manually loaded when feeding, so it cannot be guaranteed that the angle of the display screen is just vertical, and it is often inclined upward or downward. The influence is also very large, therefore, it is necessary to use the display screen position correction mechanism 2 in the present invention to adjust and correct the display screen. Control the first cylinder 21 to push the correction frame 22 forward and fix it. At this time, the front faces of the four block sensors 23 on the correction frame 22 are in the vertical plane. When the worker places the display screen on the conveyor belt 1, Cooperate with the display screen position correction mechanism 2, manually adjust the position and angle of the display screen, so that the front of the display screen touches the four block sensors 23 at the same time, and the block sensor 23 sends a corresponding induction signal, indicating that the display screen is in a vertical state , the correction is completed, and you can enter the visual test station 3 for testing.

When the display screen 4 to be detected was positioned in front of the visual testing station, the movable darkroom cover 33 on the workbench 31 moved forward under the drive of the second cylinder 331 to completely cover the display screen to be detected, so that the display screen 4 was located in a In a relatively dark environment, and then control the testing agency in it for detection. The test mechanism is mainly composed of an xy electric platform, and the lens on it is controlled by a servo motor to collect images, and then processed and merged by the vision processing system of the test station host to obtain test results. After the test is completed, the movable darkroom cover 33 is automatically removed, and the conveyor belt 1 transports the detected display screen to the unloading station.

To sum up, the large-size flat display screen visual inspection system of the present invention can use the display screen position correction mechanism to make the angle of the display screen in a vertical state, so that it can reach a unified test position, and then automatically enter the test station by the conveyor belt. The visual test is automatically completed in the darkroom environment formed by the movable darkroom cover 33, and finally it is automatically sent to the unloading station, and the material can be manually unloaded. Therefore, using the visual detection system of the present invention to carry out visual detection of large-size flat display screens can ensure accurate angular positioning of the display screen and fast positioning speed, which is conducive to improving the accuracy and efficiency of testing; and the movable darkroom cover can build a light The detection environment with uniform brightness makes the detection not affected by the brightness of the external environment and makes the detection result more accurate.

Claims (3)

1. the vision detection system of a large scale flat-faced screen; This vision detection system comprises the travelling belt (1) that is used for the transmitting and displaying screen; It is characterized in that: this vision detection system also comprises screen position straightening mechanism (2) and visual test station (3); Wherein, the correction box (22) that said screen position straightening mechanism (2) has first cylinder (21) and driven by first cylinder (21) is equipped with four block inductors (23) on the said correction box (22); Said visual test station (3) has a worktable (31) and is arranged on the mechanism for testing (32) on the worktable (31); And go up at worktable (31), the outside of mechanism for testing (32) is provided with a removable darkroom cover (33), shown in removable darkroom cover (33) drive by second cylinder (331).

2. the vision detection system of a kind of LCD display according to claim 1; It is characterized in that: described mechanism for testing (32) comprises the sliding rail frame (321) that is arranged on the worktable (31) and is installed in x on the sliding rail frame (321) to slide unit (322) that x is driven by first servomotor (323) that is arranged on sliding rail frame (321) the place ahead to slide unit (322); Said x is equipped with y to slide (324) on slide unit (322), y is equipped with two groups of z to support (325) on slide (324), and z drives by being arranged on second servomotor (326) of y on slide (324) to support (325); Each z is separately installed with testing lens (327) on support (325).

3. the vision detection system of a kind of LCD display according to claim 2; It is characterized in that: described two groups of z drive through second servomotor (326) by being arranged on the forward lead screw of y in slide (324) to support (325); Every group of z presents down respectively on support (325) two testing lens (327) is set, i.e. the rectangular distribution of four testing lens (327).

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