CN217767102U

CN217767102U - Appearance detection device of liquid crystal display

Info

Publication number: CN217767102U
Application number: CN202221163550.1U
Authority: CN
Inventors: 朱庆华; 华卫华; 黄双平
Original assignee: Shenzhen Quanzhou Automation Equipment Technology Co ltd
Current assignee: Shenzhen Quanzhou Automation Equipment Technology Co ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-11-08
Anticipated expiration: 2032-05-16

Abstract

The utility model discloses an outward appearance detection device of LCD screen for detect the outward appearance of LCD screen, include: the bearing surface of the support table is used for bearing the liquid crystal screen; the imager is arranged on one side of the bearing surface; the coaxial light source is positioned on one side of the support platform facing the imager, and the emitted light faces the bearing surface; and the side parallel light source is positioned on the outer side of the support table and is used for emitting horizontal light. The problem of the visual detection system among the prior art be difficult to distinguish the edge breakage, the corner breakage, the fish tail, the internal crack on the LCD screen edge, or criticize sharp-pointed (burr) and wait not obviously the defect and lead to easily causing lou examining is solved.

Description

Appearance detection device of liquid crystal display

Technical Field

The utility model relates to a LCD screen quality testing technical field especially relates to an outward appearance detection device of LCD screen.

Background

With the rapid development of the liquid crystal display industry, in order to improve the production speed of screens, the existing imaging detection scheme adopting machine vision replaces human eyes to detect, and the automatic detection of the liquid crystal screen is realized by shooting images. In the production and manufacturing process of the liquid crystal screen and the equipment transportation process, appearance defects such as bubbles, attached foreign matters, scratches, dirt, concave and convex points, concave and convex marks, broken pieces, edge breakage, corner breakage and the like are inevitable.

The defects with obvious front surface, such as scratches, liquid leakage, ink loss and edge collapse angles on the screen can be shot by photographing after the front surface of the liquid crystal screen is polished. If the edge of the liquid crystal display has small area defects such as scratches, burrs (burrs) and the like, in an image shot by directly adopting front light, the difference between light reflected by the defect at the edge and non-defect area reflected light is not large, so that the gray level difference generated by the invisible defects such as edge breakage, corner breakage, scratch, internal cracks or burrs (burrs) at the edge during imaging is not obvious, and the invisible defects such as edge breakage, corner breakage, scratch, internal cracks, small bubbles or burrs (burrs) at the edge are difficult to distinguish by a detection system, so that detection omission is easily caused.

Accordingly, the prior art is yet to be improved and developed.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned prior art not enough, an object of the utility model is to provide an outward appearance detection device of LCD screen, thereby the visual detection system of solving among the prior art is difficult to distinguish the liquid crystal screen edge on the not obvious defect such as the limit of collapsing, the angle of collapse, fish tail, inside crackle, or criticizing cutting edge of a knife or a sword (burr) and lead to easily causing the problem of lou examining.

The technical scheme of the utility model as follows:

an appearance inspection device of a liquid crystal panel for inspecting an appearance of the liquid crystal panel, comprising: the bearing surface of the support table is used for bearing the liquid crystal screen;

the imager is arranged on one side of the bearing surface;

the coaxial light source is positioned on one side of the support platform facing the imager, and the emitted light faces the bearing surface;

and the side parallel light source is positioned on the outer side of the support table and is used for emitting horizontal light.

Further, side collimated light source includes a plurality of side bar light source spare, and a plurality of side bar light source encircle a supporting bench a week setting.

Further, the plurality of side strip-shaped light source conditions comprise a first side light strip, a second side light strip, a third side light strip and a fourth side light strip which are connected end to end;

the first side light bar, the second side light bar, the third side light bar and the fourth side light bar are respectively and independently controlled, or two adjacent light bars are controlled as a group.

Furthermore, the appearance detection device also comprises a light source bracket, and the coaxial light source and the imager are fixed on the light source bracket;

the supporting table is movably arranged below the imager, the first side surface light strip is fixedly arranged on the supporting table, and the second side surface light strip, the third side surface light strip and the fourth side surface light strip are fixedly arranged on the light source support.

Further, the coaxial light source includes: a coaxial light emitting part, a light emitting surface of which is perpendicular to the bearing surface;

and the semi-transmitting and semi-reflecting sheet is positioned on the light-emitting side of the coaxial light-emitting part and is obliquely arranged between the support platform and the imager.

Further, the coaxial light emitting section includes: a plurality of first light emitting portions and a plurality of second light emitting portions;

the first light-emitting part and the second light-emitting part are arranged at intervals and are respectively and independently controlled.

Further, the first light-emitting portion and the second light-emitting portion are arranged at intervals in the lateral direction, or arranged at intervals in the longitudinal direction;

each of the first light emitting parts and each of the second light emitting parts are individually controlled;

or alternatively

Some or all of the plurality of first light-emitting portions are controlled in parallel, and some or all of the plurality of second light-emitting portions are controlled in parallel.

Furthermore, the appearance detection device of the liquid crystal display screen also comprises a side inclined light source assembly which is arranged around the support table;

the light-emitting surface and the bearing surface of the side surface inclined light source component are arranged at a preset inclination angle.

Further, the side-tilted light source assembly includes:

first slope light source, first slope light source encircle a supporting bench a week and set up, and the inclination between the light emitting surface of first slope light source and the loading face is: 65-75 degrees;

the second inclined light source is positioned on one side of the first inclined light source facing the imager, and the inclination angle between the light emitting surface and the bearing surface of the second inclined light source is as follows: 45 to 60 degrees.

Further, the first and second oblique light sources each include: the fixing frame and the strip-shaped luminous part are connected to the fixing frame through the adjusting part, and the adjusting part is used for adjusting the inclination angle between the luminous surface and the bearing surface of the strip-shaped luminous part.

Has the advantages that: compared with the prior art, the utility model provides an appearance inspection device of LCD screen, through setting up coaxial light source, make the light that coaxial light source sent towards the plummer, the light reflection that shines on the LCD screen gets into the imager, shoots the image of LCD screen, because the LCD screen shows the region by the light irradiation that coaxial light source sent, the light direction that reflects of the place of defect on its screen is different, thereby form the grey scale in the image, can show the defect in the image, and the defect that lies in the screen edge (edge chipping, corner chipping, fish tail, inside crackle or criticize cutting edge (burr)), because the region is little, and a lot of overlap or be covered in the thickness direction of screen, therefore, the side parallel light source is arranged outside the support table, the light emitting surface of the side parallel light source is perpendicular to the bearing surface, so that the side horizontal light source emits horizontal light, the horizontal light emitted from the light emitting surface of the side parallel light source is over against the edge side surface of the liquid crystal screen on the support surface, when the front light of the side surface is irradiated on the liquid crystal screen, the edge directly receives light, irregular reflection can be formed at the defective position, obvious gray scale is generated on the image shot by the imager, and the defective position can be obviously distinguished. Therefore, the coaxial light source and the side parallel light source are combined for visual detection, so that the formed image can easily distinguish the unobvious defects such as edge breakage, corner breakage, scratch, internal crack, or edge burrs (burrs) on the edge of the liquid crystal screen, and the problem of missed detection is not easily caused. In addition, the glass has the thickness of 0.5-2.2mm, edge collapse and corner collapse can have various forms, lateral oblique light is needed to supplement in addition to lateral horizontal light, and therefore a lateral oblique light source assembly can be arranged on the lateral surface, and the liquid crystal screen can be subjected to light polishing detection at different oblique angles.

Drawings

Fig. 1 is a schematic structural diagram of an appearance inspection apparatus using a liquid crystal display according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a light source portion of an appearance inspection apparatus using a liquid crystal display according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a supporting table portion of an appearance inspection apparatus for a liquid crystal display panel according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a coaxial light source of an appearance inspection apparatus using a liquid crystal display according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating an arrangement of coaxial light emitting portions of a coaxial light source of an appearance inspection apparatus for a liquid crystal display according to an embodiment of the present invention;

fig. 6 is another schematic arrangement diagram of the coaxial light emitting portions of the coaxial light source of the appearance inspection apparatus for liquid crystal display according to the embodiment of the present invention;

fig. 7 is an exploded view of a side-inclined light source assembly of an appearance inspection apparatus using a liquid crystal display according to an embodiment of the present invention.

The reference numbers in the figures: 100. a support table; 101. a bearing surface; 110. an imager; 120. a coaxial light source; 121. a light-shielding shell; 122. a coaxial light emitting section; 123. a semi-transparent semi-reflective sheet; 124. a first light emitting section; 125. a second light emitting section; 126. an optical film; 127. a third light emitting section; 130. a side parallel light source; 131. a lateral strip-shaped light source element; 132. a first side light bar; 133. a second side light bar; 134. a third side light bar; 135. a fourth side light bar; 136. a linear moving module; 140. a light source holder; 150. a side-tilting light source assembly; 151. a first tilted light source; 152. a second tilted light source; 153. a third tilted light source; 154. a fixed mount; 155. an adjustment member; 156. a strip-shaped light emitting section; 160. a liquid crystal screen; 170. a backlight source.

Detailed Description

The utility model provides an outward appearance detection device of LCD screen, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right to refer to the drawing below and to lift the example the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the imaging detection scheme of machine vision, defects (such as broken corners) with obvious front surfaces, such as scratches, liquid leakage, ink loss and edge broken corners on the display surface of the front surface of the screen, can be shot by the imager from the front surface after the front surface of the liquid crystal screen is polished. If the edge of the liquid crystal screen has small area defects such as scratches, burrs (burrs) and the like, because in an image shot by directly adopting front light, the difference between light received and reflected by the defects at the edge and non-defect area reflected light is not large, so that the gray scale difference generated by the non-obvious defects such as edge breakage, corner breakage, scratches, internal cracks or burrs (burrs) at the edge during imaging is not obvious, a plurality of imagers at different angles can be arranged, images are shot from different angles to obtain images at different positions, and therefore the detection system can distinguish the non-obvious defects such as edge breakage, corner breakage, scratches, internal cracks or burrs (burrs) at the edge from multiple angles. However, this approach requires multiple imagers, which are very costly in a machine vision imaging inspection scheme, and thus, while edge defect detection can be achieved, the cost is very high.

As shown in fig. 1, the present disclosure further provides an apparatus for detecting an appearance defect of a liquid crystal panel 160 based on an imager 110. Defects on the display surface of the liquid crystal panel 160 and non-obvious defects at the edges of the liquid crystal panel can be detected normally. This outward appearance detection device's concrete structure includes: a support stage 100, an imager 110, a coaxial light source 120, and a side-parallel light source 130. For convenience of structural description, when performing the appearance inspection, the lcd screen 160 is laid flat on the supporting table 100, and the imager 110 is located above the supporting table 100 to photograph the lcd screen 160. The upper surface of the supporting stage 100 is a supporting surface 101, and the supporting surface 101 of the supporting stage 100 is used for supporting the lcd panel. The imager 110 is fixedly disposed on one side (above) of the supporting surface 101 and is spaced from the supporting surface 101, and generally, the imager 110 includes a camera and a lens, and the image captured by the imager 110 is transmitted to the imaging detection software of the machine vision, so as to implement automatic analysis and detection. The coaxial light source 120 is located on a side of the support table 100 facing the imager 110, and emits light toward the supporting surface 101; specifically, the coaxial light source 120 is located above the support 100 and emits light toward the display surface of the liquid crystal panel. In order to facilitate the description of the structure, in this embodiment, for example, the light emitted by the light source is theoretically parallel light, the light source has a light emitting surface, and for example, the stripe light is a plane of the front end of the light source, so that the light emitted by the light source is perpendicular to the light emitting surface. In the embodiment, the side-surface parallel light source 130 is located outside the supporting table 100, and the light-emitting surface thereof is perpendicular to the supporting surface 101 for emitting horizontal light (parallel to the horizontal plane or parallel to the horizontal plane as much as possible). For convenience of structural description, the side toward the center of the supporting stage 100 is referred to as the inner side, and the side away from the center of the supporting stage 100 is referred to as the outer side. The lateral parallel light source 130 is arranged on the outer side of the support table 100, the emitted light can be perpendicular to the lateral surface of the liquid crystal screen on the support table 100, the lower end of the lateral parallel light source 130 can be flush with the bearing surface 101 by adjusting the height of the lateral parallel light source 130, so that the lateral parallel light source 130 can emit light to the lateral surface of the liquid crystal screen, the light on the lateral surface is reflected at the defect position and enters the imager 110 above, imaging is realized, and the defect position on the edge side is obvious.

The main implementation principle of this embodiment is: by arranging the coaxial light source 120, the light emitted by the coaxial light source 120 is directed to the plummer, the light irradiated on the liquid crystal screen is reflected to enter the imager 110, the image of the liquid crystal screen is shot, because the display area of the liquid crystal screen is irradiated by the light emitted by the coaxial light source 120, the light reflected by the defective part on the screen is different in direction, thereby forming gray scale in the image, the defect can be displayed in the image, and the defect (edge breakage, corner breakage, scratch, internal crack or edge (burr)) positioned at the edge of the screen can be displayed. Since the defect area is small and many of the defect areas are overlapped or covered in the thickness direction of the screen, the image formed by the coaxial light source 120 under the light irradiation of the display surface of the liquid crystal screen cannot be visually displayed (the gray scale is not obvious or covered but cannot be distinguished), the light emitting surface of the side parallel light source 130 is perpendicular to the bearing surface 101 through the side parallel light source 130 arranged outside the support table 100, so that the light emitted from the light emitting surface of the side parallel light source 130 is aligned to the edge side surface of the liquid crystal screen on the bearing surface, when the light emitted from the side parallel light source 130 is aligned to the edge side surface of the liquid crystal screen on the bearing surface, the edge directly receives light when the light is irradiated to the liquid crystal screen, irregular reflection is formed at the defective position, so that the image shot by the imager 110 generates obvious gray scale, and the defect position can be clearly distinguished. Through the imager 110 of same department, shoot the image of LCD screen under the light source of different angles, and can combine together the analysis through different images to the defect of the same position of different images is gone out in the analysis, and then can judge the defect.

Therefore, the beneficial effects of this embodiment at least include: the coaxial light source 120 and the side parallel light source 130 are combined to realize the visual detection of multiple light sources, so that the formed image can easily distinguish the defects of edge breakage, corner breakage, scratch, internal crack, edge scraping (burr) and the like on the edge of the liquid crystal display screen, and the problem of missed detection is not easily caused. And adopt same imager 110 to shoot, realized that many imagers 110 shoot the same detection effect at different angles, obviously practiced thrift the cost, the practicality is stronger, has better market advantage.

As shown in fig. 1 and fig. 2, the side parallel light source 130 of the present embodiment includes a plurality of side bar light source elements 131, which are disposed around the support table 100. All sides of the liquid crystal screen on the supporting table 100 can be polished by arranging the side strip-shaped light sources around the supporting table 100, so that the side of the liquid crystal screen can be inspected.

As shown in fig. 1, 2 and 3, the plurality of side stripe light source devices 131 in the present embodiment include a first side light bar 132, a second side light bar 133, a third side light bar 134 and a fourth side light bar 135 connected end to end. One side light strip corresponds to one side face of the liquid crystal screen, so that the liquid crystal screen can be surrounded, and the comprehensive inspection of each side face of the liquid crystal screen is facilitated. When a plurality of side light bars are adopted for lighting, the control of the side light bars can be realized by controlling the whole side light bars through one control unit, so that the whole side light bars are opened or closed together, but the two opposite side light bars can interfere with each other (for example, the first side light bar 132 and the third side light bar 134 emit light relatively inwards), and imaging observation is not facilitated. The control of the side light bars may be realized by correspondingly connecting a plurality of side light bars through a plurality of control units, so that each side light bar is independently turned on or off, but the interference between the side light bars can be avoided, but the operation process is slow, and the detection efficiency is low. In this embodiment, two adjacent light bars of the first side light bar 132, the second side light bar 133, the third side light bar 134, and the fourth side light bar 135 are controlled as a group; specifically, the first side light bar 132 and the second side light bar 133 are vertically disposed and controlled by the same control unit. The third side light bar 134 and the fourth side light bar 135 are vertically disposed and controlled by the same control unit, and the first side light bar 132 and the second side light bar 133 are disposed opposite to the third side light bar 134 and the fourth side light bar 135. Thus, the first side light bar 132 and the second side light bar 133 are turned on at the same time to detect two adjacent sides of the liquid crystal screen, and after photographing, the first side light bar 132 and the second side light bar 133 are turned off to turn on the third side light bar 134 and the fourth side light bar 135, and then photographing is performed. This avoids the effect of the opposing light and thus also improves the detection efficiency.

The side parallel light source 130 in this embodiment may be provided in other forms, for example, only one side bar light source 131 may be provided to detect one side of the liquid crystal panel. Two adjacent side bar-shaped light source parts 131 can be arranged to detect the adjacent sides of the liquid crystal screen.

As shown in fig. 2 and fig. 3, the appearance inspection apparatus in this embodiment further includes a light source bracket 140, and the coaxial light source 120 and the imager 110 are both fixed on the light source bracket 140; in the specific structure, the light source bracket 140 is erected along the vertical direction, the coaxial light source 120 is fixed on the side surface of the light source bracket 140, the imager 110 is fixed on the light source bracket 140, and the lens faces downward. The supporting table 100 is movably disposed under the imager 110, and specifically, the supporting table 100 is connected to the linear moving module 136, and the linear moving module 136 can move under the light source bracket 140 along a predetermined direction. The linear moving module 136 drives the supporting platform 100 to move out of the light source bracket 140, so as to place the lcd screen on the supporting platform 100 or take out the detected lcd screen. The linear moving module 136 drives the supporting platform 100 to move into the light source bracket 140, so that the lcd panel reaches a predetermined position for performing the appearance inspection. The first side light bar 132 is fixedly disposed on the support 100 such that the first side light bar 132 moves along with the support 100. The second side light bar 133, the third side light bar 134, and the fourth side light bar 135 are all fixedly disposed on the light source bracket 140. After moving to the preset position under the imager 110, the first side light bar 132, the second side light bar 133, the third side light bar 134, and the fourth side light bar 135 form a side parallel light source 130 that surrounds the support table 100 by one turn, and the emitted light can directly face the side of the lcd panel.

As shown in fig. 1 and 4, the coaxial light source 120 in the present embodiment includes: a light shielding case 121, a coaxial light emitting part 122, and a half-transmissive and half-reflective sheet 123. The light shielding shell 121 is fixedly arranged on the light source support 140, the light shielding shell 121 is arranged around the support table 100, a detection space is formed in the middle of the light shielding shell 121, and the support table 100 moves to an area covered by the detection space during observation and detection. The coaxial light emitting unit 122 is disposed on one side surface of the light shielding case 121, and a light emitting surface of the coaxial light emitting unit 122 is perpendicular to the bearing surface 101. The transflective sheet 123 is positioned on the light-emitting side of the coaxial light-emitting part 122, and is obliquely disposed between the supporting stage 100 and the imager 110; in a specific structure, the half-transmitting and half-reflecting plate 123 is fixedly disposed in the light shielding case 121 and is inclined at 45 ° from the horizontal plane, the light emitting surface of the coaxial light emitting section 122 is perpendicular to the horizontal plane, and the imager 110 is disposed in the vertical direction. Thus, when the coaxial light emitting section 122 emits light, the light passes through the half mirror 123 to reflect the light in the horizontal direction and then to be directed vertically, so that the light emitted from the coaxial light emitting section 122 is irradiated along the front surface of the liquid crystal panel. The light reflected from the liquid crystal panel is transmitted into the imager 110 through the half mirror 123.

By disposing the coaxial light emitting portion 122 on the side, the light emitting members can be fully disposed on the whole side, and compared to the conventional method of disposing the coaxial light around the imager 110, the coaxial light source 120 has a short light emitting distance, can emit light on the whole side, has no dark detection area, and can distribute light more uniformly on the whole bearing surface 101. In the conventional method of disposing coaxial light around the imager 110, no light is emitted from the middle of the imager 110, which results in dark detection area, uneven light distribution and poor detection effect.

As shown in fig. 1, 5, and 6, the coaxial light emitting unit 122 in the present embodiment includes at least: a plurality of first light emitting portions 124, and a plurality of second light emitting portions 125. The first light emitting portion 124 and the second light emitting portion 125 are disposed at an interval. Each first light emitting portion 124 and each second light emitting portion 125 is individually controlled, for example: each of the first light emitting portions 124 is turned on or off by a separate one of the control units, and each of the second light emitting portions 125 is turned on or off by a separate one of the control units. Or some or all of the plurality of first light-emitting portions 124 are controlled in parallel and some or all of the plurality of second light-emitting portions 125 are controlled in parallel, for example, distant ones of the first light-emitting portions 124 are controlled by one control unit and distant ones of the second light-emitting portions 125 are controlled by another control unit. Or a plurality of first light emitting parts 124 are collectively turned on or off by one control unit, the second light emitting part 125 is turned on or off by another control unit, and the first light emitting part 124 and the second light emitting part 125 may be turned on or off simultaneously.

In the control process, the first light-emitting parts 124 or the first light-emitting part 124 arranged at intervals are turned on at one time, then the liquid crystal screen is photographed, then the first light-emitting part 124 is turned off, the second light-emitting parts 125 arranged at intervals are turned on, or one second light-emitting part 125 is turned on, and then the liquid crystal screen is photographed. Thus, the incident light on the liquid crystal panel has a small angle by lighting the local coaxial light emitting sections 122, and the minute bubbles can be clearly seen from the photograph by alternately lighting the coaxial light emitting sections 122. As shown in fig. 1 and 5, the first light-emitting portion 124 and the second light-emitting portion 125 are spaced apart from each other, and the advantage of using the spacing for opening or closing is as follows: generally, the support table 100 is designed to be large enough to detect liquid crystal panels of different specifications, so that the coaxial light emitting portion 122 also needs to be matched with the support table 100 to be arranged, so that the bearing surface 101 can support most of the liquid crystal panels on the market, and when a small-sized liquid crystal panel is placed on the support table 100, for example, a small bubble exists on the liquid crystal panel, the small bubble reflects light emitted by the coaxial light emitting portion 122, because the defect area has a radian, the reflected light is different from normal light, so that the reflected light can be displayed by an image, and the more the light incident on the liquid crystal panel is, the more the imaging effect is obvious. However, in practice, the light emitted from the coaxial light emitting section 122 is scattered light, and if the coaxial light emitting section 122 having a large area is used to emit light even when the defect is small, a large amount of scattered light is irradiated to the defect area, and the gray scale after imaging is not conspicuous, so that the defect area is inconspicuous from the normal area of the screen. And the first light emitting part 124 and the second light emitting part 125 are arranged at intervals, when the first light emitting part 124 emits light, the second light emitting part 125 is closed, so that light in a limited area is irradiated on the liquid crystal screen, interference of scattered light in other areas is avoided, light reflected to the imager 110 in a defect area can be distinguished from light entering the imager 110 in a normal area of the screen, and the defect area can be obviously distinguished from the normal area of the screen.

As shown in fig. 1 and 5, in one of the coaxial light emitting portions 122, the first light emitting portion 124 and the second light emitting portion 125 are arranged at intervals in the lateral direction or in the longitudinal direction; specifically, the first light emitting part 124 and the second light emitting part 125 are both strip-shaped, and the first light emitting part 124 and the second light emitting part 125 are arranged at intervals. The strip-shaped light sources are arranged at intervals, so that local light sources are adopted during photographing, and the generated local light can irradiate the liquid crystal screen in the vertical direction (even if scattering exists, the incident light angle is small because the peripheral light is not bright and has no scattering interference of the peripheral light), so that tiny bubbles can be obviously observed from the picture.

As shown in fig. 1 and 6, in another coaxial light emitting portion 122, the arrangement of the first light emitting portion 124 and the second light emitting portion 125 in this embodiment is also modified, such that the first light emitting portion 124 and the second light emitting portion 125 are arranged at intervals in the transverse direction and at intervals in the longitudinal direction. Therefore, when the first light emitting unit 124 is turned off, the second light emitting unit 125 is turned off around the first light emitting unit 124 to make the surroundings of the first light emitting unit 124 dark, thereby avoiding the influence of excessive scattered light around the surroundings as much as possible and enabling the defective area to be clearly displayed in the image captured by the imaging unit.

As shown in fig. 1 and 5, the coaxial light-emitting portion 122 further includes a plurality of third light-emitting portions 127, wherein the third light-emitting portions 127, the first light-emitting portions 124, and the second light-emitting portions 125 are sequentially arranged and are provided in multiple groups. The plurality of first light emitting parts 124, the plurality of second light emitting assemblies 125 and the plurality of third light emitting parts 127 are respectively opened and then photographed, so that the photographed photos can more clearly display the micro-bubbles.

As shown in fig. 1 and 4, an optical film 126, such as a diffusion sheet, may be further provided on the light exit side of the coaxial light emitting section 122 to uniformly modulate the coaxial light.

It is conceivable that the coaxial light emitting section 122 may also employ a plurality of light emitting sections, which are controlled to be turned on or off in a unified manner by one control unit, thereby achieving light source control. However, this method is not effective for inspecting small bubbles on the surface of the liquid crystal panel.

In addition, various other forms of light sources may be added to this embodiment, and the specific structure is as follows:

as shown in fig. 1, the appearance inspection apparatus of the liquid crystal display further includes a backlight 170, the backlight 170 is located on a side of the bearing surface 101 away from the imager 110, and light emitted by the backlight 170 is transmitted through the bearing surface 101. The backlight source 170 is arranged to irradiate light from the back of the liquid crystal screen and image the front of the liquid crystal screen, so that a light transmission area on the liquid crystal screen can be seen, and whether the liquid crystal screen is qualified or not can be judged according to the standard. In a specific structure, the backlight source may be disposed on the supporting stage 100 or disposed separately from the supporting stage 100, for example, when the supporting stage 100 is disposed separately, the supporting surface 101 of the supporting stage 100 is made of a light-transmitting material, and when the supporting stage 100 moves above the backlight source, the backlight source is activated to emit light toward the supporting surface 101. The backlight source in this embodiment is disposed on the supporting platform 100 and below the supporting surface 101.

As shown in fig. 1 and 2, the appearance inspection apparatus for a liquid crystal display further includes a side-tilting light source assembly 150, the side-tilting light source assembly 150 is disposed around the supporting stage 100, and a light-emitting surface of the side-tilting light source assembly 150 and the supporting surface 101 are disposed at a predetermined tilt angle. Through the arrangement of the inclined light source component, light emitted by the light emitting surface of the inclined light source component is obliquely emitted to the bearing surface 101, so that the defects that different positions on the liquid crystal screen are not obvious can be detected after the inclined light irradiates the liquid crystal screen. By the irradiation of the irradiation light with different angles, the light reflected by the defects at different positions on the liquid crystal screen into the imager 110 is different, so that the images of the defects on different images are different, and the defects can be clearly displayed on the images at certain angles, thereby realizing more comprehensive detection through various lights. For example: the glass has a thickness of 0.5-2.2mm, edge collapse and corner collapse can be in various forms, lateral oblique light is needed to supplement in addition to lateral horizontal light, and therefore the lateral oblique light source assembly 150 is arranged on the lateral surface, and the liquid crystal screen can be subjected to light irradiation detection at different oblique angles, so that missing detection is avoided.

As shown in fig. 1 and 2, the side-tilted light source assembly 150 in the present embodiment may be provided in various forms, wherein the first form includes: the first oblique light source 151, the first oblique light source 151 is disposed around the support platform 100, an inclination angle a between a light emitting surface of the first oblique light source 151 and the support surface 101 is: 65-75 degrees. Taking the light emitted by the first oblique light sources 151 as parallel light, the light emitted by the first oblique light sources 151 forms an angle with the supporting surface 101 of 15-25 °. The light is directed towards the liquid crystal screen in a direction inclined at 15-25 deg. to the horizontal, thus forming a bottom-angle inclined light source.

The second form comprises: a second oblique light source 152, the second oblique light source 152 being located on a side of the first oblique light source 151 facing the imager 110, an inclination angle a between a light emitting surface of the second oblique light source 152 and the supporting surface 101 being: 45 to 60 degrees. For example, if the light emitted from the second oblique light sources 152 is parallel light, the angle between the light emitted from the second oblique light sources 152 and the supporting surface 101 is between 30 ° and 45 °. The light is directed towards the liquid crystal screen at an angle which is inclined between 30 deg. -45 deg. horizontally, thus forming a medium-angle inclined light source.

The third form includes: a third inclined light source 153, where the third inclined light source 153 is located on a side of the first inclined light source 151 facing the imager 110, for example, on an upper side of the coaxial light source 120, and an inclination angle a between a light emitting surface of the third inclined light source 153 and the bearing surface 101 is: 20 to 35 degrees. For example, the light emitted by the third tilted light source 153 is parallel light, and the angle between the light emitted by the third tilted light source 153 and the supporting surface 101 is between 55 ° and 70 °. The light is directed towards the liquid crystal screen at an angle of between 55 deg. -70 deg. oblique to the horizontal, thus forming a high-angle oblique light source.

Alternatively, the above three forms may be combined. In the present embodiment, the side-tilting light source assembly 150 is formed by combining the first tilting light source 151 and the second tilting light source 152. The detection of the defects can be carried out effectively basically. The first mode and the third mode may be combined, and the second mode and the third mode may be combined.

As shown in fig. 2 and 7, in the specific structure of the side-tilting light source assembly 150, each of the first tilting light source 151 and the second tilting light source 152 includes: the light-emitting device comprises a fixing frame 154 and a strip-shaped light-emitting part 156 connected to the fixing frame 154 through an adjusting part 155, wherein the adjusting part 155 is used for adjusting the inclination angle between the light-emitting surface of the strip-shaped light-emitting part 156 and the bearing surface 101. In the concrete structure, mount 154 is "nearly" font, has installation space, and bar illuminating part 156 is accommodated in the installation space, and makes the both ends of bar illuminating part 156 articulate on mount 154, is provided with the arc regulation hole in addition on the side of mount 154, sets up the screw in the arc regulation hole, and the screw passes the arc regulation hole and connects on bar illuminating part 156, and such mount 154 and bar illuminating part 156 all set up along four sides. Thereby forming a side-tilt light source assembly 150 around the support stage 100.

In addition, in order to limit the liquid crystal screen, a vacuum suction hole is formed in the bearing surface 101, and negative pressure can be generated in the vacuum suction hole by connecting the support table 100 with an external negative pressure pipe, so that the liquid crystal screen is adsorbed and fixed.

To sum up, the present invention provides an appearance inspection apparatus for a liquid crystal display, by providing a coaxial light source 120, the light emitted from the coaxial light source 120 is directed to a plummer, the light irradiated onto the liquid crystal display is reflected to enter an imager 110, and the image of the liquid crystal display is captured, because the display area of the liquid crystal display is irradiated by the light emitted from the coaxial light source 120, the light reflected from the defective area on the screen is different, thereby forming a gray scale in the image, and the defect can be displayed in the image, and the defect (edge break, corner break, scratch, internal crack or burr) located at the edge of the screen is overlapped or covered in the thickness direction of the screen, because the area is small, and many defects are overlapped or covered in the thickness direction of the screen, so that the light emitted from the light emitting area of the coaxial light source 120 toward the display surface of the liquid crystal display cannot be visually displayed (the gray scale is not obvious, or covered and cannot be distinguished), therefore, through the side parallel light source 130 arranged outside the support table 100, the light emitting area of the side parallel light source 130 is perpendicular to the bearing surface 101, so that the light emitted from the light emitting area of the side parallel light source 130 is aligned to the edge on the side of the liquid crystal display, and the side parallel light source 110, so that the defect can be directly reflected on the side of the liquid crystal display, and the defect can be distinguished, and the image, thereby forming an irregular image, when the defect can be directly reflected on the side of the liquid crystal display, and the defect can be directly formed. Therefore, the coaxial light source 120 and the side parallel light source 130 are combined for visual inspection, so that the formed image can easily distinguish the unobvious defects such as edge breakage, corner breakage, scratch, internal crack, or edge scraping (burr) on the edge of the liquid crystal display, and the problem of missed inspection is not easily caused.

It should be understood that the application of the present invention is not limited to the above examples, and that modifications or changes can be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.

Claims

1. An appearance detecting device of a liquid crystal display screen is used for detecting the appearance of the liquid crystal display screen, and is characterized by comprising: the bearing surface of the support table is used for bearing the liquid crystal screen;

the imager is arranged on one side of the bearing surface;

the coaxial light source is positioned on one side, facing the imager, of the support table, and the emitted light faces the bearing surface;

2. The apparatus of claim 1, wherein the side parallel light source comprises a plurality of side bar light sources, and the side bar light sources are disposed around the support platform.

3. The apparatus of claim 2, wherein the plurality of side light bar-shaped light source elements comprise a first side light bar, a second side light bar, a third side light bar, and a fourth side light bar connected end to end;

4. The device for detecting the appearance of the liquid crystal display panel according to claim 3, wherein the device further comprises a light source bracket, and the coaxial light source and the imager are fixed on the light source bracket;

5. The apparatus for detecting the appearance of a liquid crystal panel according to claim 1, wherein the coaxial light source comprises: the light-emitting surface of the coaxial light-emitting part is vertical to the bearing surface;

and the semi-transmitting and semi-reflecting sheet is positioned on the light-emitting side of the coaxial light-emitting part and is obliquely arranged between the supporting platform and the imager.

6. The apparatus for detecting the appearance of a liquid crystal panel according to claim 5, wherein said coaxial light emitting unit comprises: a plurality of first light emitting portions and a plurality of second light emitting portions;

7. The apparatus of claim 6, wherein the first and second light-emitting portions are spaced apart in a lateral direction or spaced apart in a longitudinal direction;

each of the first light-emitting portions and each of the second light-emitting portions are individually controlled;

or alternatively

8. The apparatus of claim 1, further comprising a side-tilt light source assembly disposed around the support;

and the light-emitting surface of the side surface inclined light source assembly and the bearing surface are arranged at a preset inclination angle.

9. The apparatus of claim 8, wherein the side-tilting light source assembly comprises:

first slope light source, first slope light source encircles a supporting bench week sets up, the light emitting area of first slope light source with inclination between the loading face does: 65-75 degrees;

the second inclined light source is located the first inclined light source orientation one side of imager, the light emitting surface of second inclined light source with inclination between the loading surface does: 45 to 60 degrees.

10. The apparatus of claim 9, wherein the first oblique light source and the second oblique light source each comprise: the fixing frame is connected with the strip-shaped light emitting part on the fixing frame through the adjusting part, and the adjusting part is used for adjusting the light emitting surface of the strip-shaped light emitting part and the inclination angle between the bearing surfaces.