CN1318904C - Orientation detection method and device for alignment film - Google Patents

Abstract

The orientation detection method of the alignment film is used for the orientation detection of the glass substrate with the alignment film formed on the surface and subjected to surface grinding treatment, and at least comprises the following steps: the method comprises the steps of uniformly adhering a layer of water molecules on the surface of an alignment film of the glass substrate, projecting light rays on the surface of the alignment film by using a proper light source, capturing an image reflected by the surface of the alignment film by using an image capturing device, and finally carrying out orientation comparison detection on the alignment film according to the image, wherein the detection device comprises a conveying belt, a water molecule adhering device, a light source and an image capturing device. The method comprises the following steps of (1) enabling the surface of an alignment film of a glass substrate to face upwards, placing the alignment film on a conveyer belt, and driving the glass substrate to move by the conveyer belt; the water molecule attaching device is arranged above the conveyer belt, water molecules around the glass substrate are attached to the surface of the alignment film in a liquid state by using the condensation principle, the light source is arranged above the conveyer belt, and after the light is projected on the surface of the alignment film, the image capturing device captures the image reflected from the surface of the alignment film for directional detection.

Description

Orientation detection method and device for alignment film

technical field

The invention relates to a method and a device for detecting the orientation of a liquid crystal molecular alignment film, in particular to a method and a device for automatically detecting the orientation ability of a liquid crystal molecular alignment film.

Background technique

At present, liquid crystal material is a kind of crystalline liquid with optical anisotropy and fluidity, which will cause molecules to rotate in different directions according to changes in electric field or temperature, and become transparent, translucent, and opaque states, while liquid crystal planes The display uses this principle to rotate the direction of the long axis of the liquid crystal molecules to change the brightness of the emitted light to form an image.

In order to make the liquid crystal material present regular arrangement and alignment in advance on the surface of the glass substrate, an alignment film must be formed on the surface of the glass substrate. The material of the alignment film is usually polyamide, which is printed on the After the surface of the glass substrate, rubbing is carried out with a wool cloth to make the surface of the polyamide resin of the alignment material present an alignment state along the predetermined direction. After the liquid crystal molecules are injected into the glass substrate, the liquid crystal molecules can be arranged regularly on the surface of the alignment film.

The existing orientation detection technology of the alignment film uses the personnel to hold the glass substrate and adjust the position and angle of the glass substrate in front of a steam ejection port. When the water vapor contacts the surface of the alignment film, the relative temperature of the alignment film of the glass substrate is low, so The gaseous water molecules will condense into liquid particles and adhere to the alignment film. At this time, an appropriate light source is projected on the surface of the alignment film, and the reflected light is used to observe the adhesion and arrangement of the water molecules on the alignment film with the naked eye to determine the alignment film. orientation quality.

As shown in FIG. 1 , the person takes the glass substrate 1 with both hands, sprays water vapor 32 onto the glass substrate 1 in front of a steam ejection port 31, and then adjusts the reflection angle of the glass substrate 1 after using a light source 22 to project light. The alignment quality of the alignment film 10 was observed with the naked eye 4 .

Taking a general survey of the prior art, it can be found to have the following disadvantages:

1. Each glass substrate must be artificially sprayed with steam one by one and constantly adjust the reflection angle for observation and inspection. The efficiency is low and it cannot meet the needs of mass production of products.

2. It cannot be combined with other devices to improve the accuracy of judgment. It can only rely on personnel to inspect with the naked eye. Inexperienced personnel or various environmental factors may cause misjudgment, so that defective products enter the next process or good products are rejected.

Therefore, for researchers engaged in the fields related to alignment detection of alignment films, they must devote themselves to solving the shortcomings of the prior art in order to obtain better quality.

Contents of the invention

The main purpose of the present invention is to provide a method and device for detecting the orientation of an alignment film, so as to improve the efficiency of detecting the orientation of the alignment film.

The main purpose of the present invention is to provide a method and device for detecting the orientation of an alignment film, so as to improve the accuracy of the detection of the orientation of the alignment film.

The orientation detection device of the alignment film provided by the present invention is suitable for the orientation detection of a glass substrate on which an alignment film has been formed on the surface and has undergone surface grinding treatment. It includes a conveyor belt, a water molecule attachment device, a light source, and an image capture device. Take the device.

The conveyor belt can carry and drive the glass substrate to move towards the conveying direction of the conveyor belt, and in order to facilitate orientation detection, the surface of the alignment film of the glass substrate must face upward.

The water molecule attachment device is arranged above the conveyor belt, including a condenser, a temperature and humidity controller and a plurality of barrier plates, wherein the temperature and humidity controller is located in front of the condenser, and the condenser can cool the temperature of the glass substrate surface, while The temperature and humidity controller can generate a relatively high temperature and high humidity environment. When the glass substrate is cooled by the condenser first, and then enters the high temperature and high humidity environment provided by the temperature and humidity controller, the gaseous water molecules in the air will form The liquid particles are attached to the surface of the alignment film of the glass substrate.

In the present invention, the temperature and humidity controller may also include one or more steam ejection outlets to spray a certain amount of water vapor on the surface of the alignment film of the glass substrate.

The barrier board is installed between the condenser and the temperature and humidity controller or on both sides of the water molecule attachment device, which can isolate the required working environment into a single chamber, preventing the two from interfering with each other or affecting the rear light source and image capture when they operate device.

The light source is set above the conveyor belt, and its light is projected in front of the temperature and humidity controller. When a layer of liquid water molecule particles is attached to the surface of the alignment film of the glass substrate, and is irradiated by the light projected by the light source, it will pass through and set above the conveyor belt. The image capture device captures the image reflected on the surface of the alignment film, and then performs orientation quality detection based on the captured image information.

The detection of alignment quality can be carried out manually, and the implementation method is to transmit the image information to a display, and then judge the alignment film by naked eyes.

The detection of alignment quality can also be judged by an image recognition system. The implementation method first stores the alignment film image of the standard alignment in a database, and then compares the captured alignment film image information with the standard image in the database. , to judge the alignment quality of the alignment film.

The orientation detection method of the alignment film provided by the present invention includes: (a) making water molecules evenly adhere to the surface of the alignment film; (b) using a light source to project light onto the surface of the alignment film of the glass substrate; The capturing device captures the image of the alignment film reflected by the light; (d) finally performs orientation detection according to the captured image of the alignment film.

The water molecule attachment method used in step (a) can use a condenser to cool the glass substrate, and then place the glass substrate in a relatively high-temperature and high-humidity environment, so that a layer of liquid is attached to the surface of the alignment film of the glass substrate. For water molecule particles, the relatively high temperature and high humidity environment can be achieved by using a temperature and humidity controller; in addition, water vapor can also be sprayed on the surface of the alignment film to achieve the purpose of attaching water molecules to the surface of the alignment film.

The orientation detection in step (d) can be performed manually by using the naked eye to interpret the alignment film image; in addition, an image recognition system can also be used to interpret and compare the alignment film image.

Description of drawings

Figure 1 is a schematic diagram of detection in the prior art.

Fig. 2A is a schematic diagram of a detection device according to an embodiment of the present invention.

FIG. 2B is a schematic diagram of another detection device according to an embodiment of the present invention.

Fig. 3A is a flowchart of a detection method according to an embodiment of the present invention.

FIG. 3B is a flowchart of another detection method according to an embodiment of the present invention.

Description of figure number:

1 glass substrate 22 light source

10 Alignment film surface 23 Image capture device

11 Water molecule adhesion layer 24 Information processing equipment

20 conveyor belt 25 display

21 Water Molecule Attachment Device 26 Image Recognition System

211 Condenser 31 Steam outlet

212 temperature and humidity controller 32 water vapor

213 barrier plate 4 naked eye

Detailed ways

The invention discloses a method for detecting the orientation of an alignment film and a device capable of implementing the method.

Please refer to FIG. 2A , which is a schematic diagram of an alignment detection device for an alignment film of the present invention. It includes a conveyor belt 20 , a water molecule attachment device 21 , a light source 22 and an image capture device 23 .

The conveyor belt 20 can carry a glass substrate 1 and drive it to move in the X direction, wherein the glass substrate 1 is a glass plate on which an alignment film 10 has been formed and has been surface-ground, and the surface of the alignment film 10 faces upward.

The water molecule attachment device 21 is arranged above the conveyer belt 20, and it at least includes a condenser 211 or a temperature and humidity controller 212, wherein the condenser 211 has a condensation effect and can cool the glass substrate 1, and the temperature and humidity controller 212 can A relatively high-temperature and high-humidity environment is generated in front of the condenser 211, so that after the alignment film 10 of the glass substrate 1 is cooled, it enters the high-temperature and high-humidity environment provided by the temperature and humidity controller, thereby forming a layer of liquid on the surface of the alignment film. Microscopic water molecules condense.

In practice, as long as the water molecule attachment device 21 is equipped with either the condenser 211 or the temperature and humidity controller 212 , the condensation effect of water molecules can be produced, but the condensation effect is better when both are used at the same time. The temperature and humidity controller 212 can be a plurality of steam outlets and control the temperature and humidity of the steam through a logic control circuit to achieve the effect of temperature and humidity control. In addition, in order to prevent the steam discharged from the temperature and humidity controller 212 from affecting the surrounding equipment, barrier plates 213 are provided on both sides of the temperature and humidity controller 212 to isolate different working areas.

The light source 22 is not limited to any form of projection lamp, and the light generated by it is projected on the conveyor belt 20 in front of the water molecule attachment device 21, so when the alignment film 10 of the glass substrate 1 is transported to the front of the water molecule attachment device 21 through the conveyor belt 20 When , the light just hits the surface of the alignment film 10 .

The image capture device 23 can capture the image reflected by the alignment film 10 of the light irradiating the glass substrate 1, the image capture device 23 can be a charge-coupled device (CCD), and utilizes an information processing device 24 (such as a digital signal processor) The DSP) outputs the image of the alignment film 10 to the display 25 after processing the image. At this time, the inspector can directly inspect the orientation of the alignment film 10 of the glass substrate 1 through the display 25 .

Please refer to FIG. 2B , with the vigorous development of image recognition technology, the present invention can be combined with an image recognition system 26, which is a schematic diagram of the configuration of the image recognition system. The image information of the alignment film 10 captured by the image capture device 23 is transmitted to The image recognition system 26 compares the image of the standard alignment film stored in the database to judge the alignment quality of the alignment film.

Please refer to FIG. 3A and FIG. 3B , which are flow charts of the alignment film inspection method of the present invention, the steps of which include: first placing a glass substrate 1 on a conveyor belt, wherein the glass substrate 1 is an alignment film 10 formed thereon, And after the surface grinding treatment of the glass plate, the surface of the alignment film 10 faces upward (S31); the glass substrate 1 is transported to the water molecule attachment device 21, the glass substrate is first cooled by the condenser 212, and then the temperature and humidity controller 213 is used to cool the glass plate. Provide a high-temperature and high-humidity environment to condense water molecules of liquid particles on the surface of the alignment film 10 of the glass substrate 1 (S32); project the light from the light source 22 onto the surface of the alignment film 10 (S33); use the image capture device 23 to capture Get the image information reflected by the alignment film 10 (S34); carry out orientation detection of the alignment film 10 according to the captured image information, wherein this step first transmits the image information of the alignment film to the display, and then uses a manual method (S35a) Perform interpretation, as shown in Figure 3A. Or this step can also be to use an image recognition system to receive the captured alignment film image, and compare it with the standard alignment film image stored in the database to judge the alignment quality of the alignment film (S35b), as shown in Figure 3B .

In view of the above, the detection method and detection device of the present invention have the following advantages:

1. Different from the existing detection technology, personnel have to spray the glass substrate with water vapor one by one, and constantly adjust the reflection angle for detection. The detection method and detection device disclosed in the present invention can quickly and evenly attach water molecules After aligning the surface of the film, the image capture device is used to take pictures at an optimal angle, so that the process of orientation detection can be automated and personnel actions can be simplified, so the efficiency of orientation detection of the alignment film can be truly improved.

2. In one embodiment of the present invention, the combination with the image recognition system can effectively reduce misjudgment caused by human factors, so that the accuracy of orientation detection of the alignment film can be improved indeed.

The above description is only a preferred embodiment of the orientation detection method and device of the alignment film of the present invention, and it is not intended to limit the scope of the present invention. Any modifications made by those skilled in the art without departing from the spirit of the present invention are acceptable. Should belong to the scope of the present invention, so the scope of protection of the present invention should be based on the scope of application described below.

Claims (10)

1, a kind of oriented detection method of alignment film is characterized in that, is applicable to that a surface has formed alignment film, and the oriented detection of the glass substrate of process face mill processing, and its step comprises:

One deck hydrone is adhered to the liquid particulate form in alignment film surface at this glass substrate;

With the alignment film surface of ray cast to this glass substrate;

Utilize an image capture unit to capture the image information on this alignment film surface;

Carry out the oriented detection of this alignment film according to this image information.

2, the method for claim 1, it is characterized in that, in the environment of this glass substrate by dislocation one relatively-high temperature in the environment of a relative low temperature and relative high humility, make the vaporous water molecule arround this alignment film be condensed into the liquid water molecules particulate, and then be attached to this alignment film surface.

3, the method for claim 1 is characterized in that, a certain amount of water vapor of alignment film surface sprinkling of this glass substrate, and when this water vapor contacts with this alignment film, the vaporous water molecule will condense into the liquid water molecules particulate and be attached to this alignment film surface.

4, the method for claim 1, it is characterized in that, this image capture unit more comprises a messaging device, it can be with this image information that is captured, image in a display, see through this display with manual type again institute's picked image information is carried out interpretation, defective whether occurs with the directed quality of judging this alignment film.

5, the method for claim 1, it is characterized in that, comprise that more an image identification system carries out oriented detection to this alignment film, this image identification system carries out interpretation according to the institute's picked image information and the degree of variation of the image information that sets, and judges whether the directed quality of this alignment film defective occurs.

6, a kind of oriented detection device of liquid crystal orienting film is characterized in that, is applicable to that a surface has formed alignment film, and the oriented detection of the glass substrate of process face mill processing, and it comprises:

One conveying belt can carry and drive this glass substrate and move, and wherein the alignment film surface of this glass substrate up;

One hydrone attachment device is located at the top of this conveying belt, and utilizes condensation principle to make the hydrone arround this glass substrate be attached to this alignment film surface with liquid particulate;

One light source be located at this conveying belt top, and throw light is in this alignment film surface;

One image capture unit, fechtable are from the image of this alignment film surface reflection, to carry out oriented detection.

7, device as claimed in claim 6, it is characterized in that, this hydrone attachment device comprises a condenser, after this condenser can be cooled to this glass substrate one relative low temperature, makes the vaporous water molecule arround it condense into liquid particulate and be attached to this alignment film surface.

8, device as claimed in claim 6, it is characterized in that, this hydrone attachment device comprises a temperature and humidity controller, this temperature and humidity controller produces the environment of a relatively-high temperature and high humility, after making this glass substrate move into this environment, the vaporous water molecule arround this glass substrate condenses into liquid particulate and is attached to this alignment film surface.

9, device as claimed in claim 6 is characterized in that, this image capture unit more comprises a messaging device and a display, sees through this messaging device and changes this image information, images on this display.

10, device as claimed in claim 6, it is characterized in that this image capture unit more comprises an image identification system, can compare institute's picked image information and be set in this intrasystem standard value image information, according to degree of variation between the two, whether the directed quality of judging alignment film defectiveness.

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