JP2005227262A - Polarizer testing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polarizer testing method capable of detecting defects in the nonuniformity in the thickness of an optical membrane which is the membrane material for a polarizer, when the membrane material is delivered, making flaw detection test cost low, simplifying the processing processes, and preventing the time required for tests from taking too long. <P>SOLUTION: Luminous rays from a selected light source 11 are made to pass through a luminous ray filter 13, a polarizing means 14, and a concave lens 15 to an optical membrane sample 16. Then the optical membrane sample 16 is moved to perform focus adjustment, and the optical membrane sample 16 is pivoted on a Z-axis to determine whether the brightness of its irradiation area changes. The presence or absence of flaws in the optical membrane sample 16 is thereby discriminated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for testing a polarizing piece, and in particular, allows light from a selected light source to pass through a light filtering piece, a polarizing means, and a concave lens, or after passing through a light filtering piece, a mirror, and a concave lens. After reaching the optical film sample and adjusting the focus by moving the optical film sample, the optical film sample is swung along the Z-axis to determine whether or not the brightness of the irradiated area changes. If it is determined that the optical film sample is flawed, and if the determination is negative, the optical film sample is determined to be an acceptable film material, the polarizing piece test method Is.

  When a new optical film material is introduced when manufacturing a polarizing piece, generally, a test is first performed to ensure that there are no defects in the product in the future. However, some wrinkles cannot be distinguished only by the naked eye. For example, the thickness of the film material is not uniform. The reason why the thickness of the film of the polarizing piece is non-uniform is mainly because the thickness of the film material is non-uniform, but such wrinkles cannot be clearly discerned with the naked eye. If there is a flaw, it is often found by a test performed in the middle of manufacturing a semi-finished product in the manufacturing process of a polarizing piece, which increases the manufacturing cost. There are challenges.

  In other words, when a polarizing piece is manufactured as a semi-finished product in the preceding manufacturing process, it is possible to strictly discriminate the thickness non-uniformity by performing a polarization orthogonal penetration inspection. In other words, if the wrinkle is detected in a semi-finished product, the timing is too late, which leads to high product costs.

In addition, it seems difficult for a leading maker of optical film materials to find the trap at an early point in time before carrying the film material. This is because the non-uniform thickness of the film cannot be identified by the naked eye, and there is a timing shift in which wrinkles are detected after being manufactured into a semi-finished product. The current situation is that it is not possible to immediately point out that there is a defect to the manufacturer.
In addition, the non-uniformity of the film thickness cannot be clearly explained by words alone, and the standard for explanation is not established, so it is difficult to communicate with each other. There is no point of interest that can be confirmed for the non-uniformity of the thickness. The situation is because there is not too much to point out and approve that there is a flaw of non-uniform thickness of the film to the top manufacturers of optical film materials, and it is not possible to clearly identify it with the naked eye alone Even if you try to improve, it is difficult to find a place to start.

As described above, the present invention has been proposed in order to eliminate the difficulty in detecting non-uniform film thickness due to various causes.
The above-mentioned film thickness non-uniformity can be detected as soon as possible when the optical film material is received so that the timing is not delayed, and the detection status can be reported to the manufacturer immediately. In addition to improving conventional defects that could only be found when a semi-finished product was completed, the film thickness non-uniformity can be clearly expressed in words, and can also be found immediately by manifestation. It is preferable that detection is possible without using expensive means.

At present, there is no test method for the technology according to the above description in the related industry, but there is a sample means in other industries, for example, for integrated circuit companies in the semiconductor industry. In the application “Taiwan No. 107261“ Method for detecting defects on surface layer of light transmissive film ”, a technique for detecting defects on the surface of semiconductor wear has been proposed. In this method, detection is performed by first depositing a plating on the permeation preventive layer, and silicon nitride, SiNox (Silicon Oxynitride), metal titanium, titanium nitride, TiW compound, photoresistance, and the like as components of the permeation layer. A similar material can be suitably employed.
In addition, “Method for Inspecting Thin Film Thickness” of Taiwan No. 82885 filed by IBM Corporation discloses a method for detecting the thickness of a thin film in a color filter by a distance measuring scanner.
Taiwan No. 107261 Taiwan No. 82885

  The present invention eliminates the problem that non-uniformity of the thickness of the film is difficult to identify with the naked eye, and has the effect of easily and clearly confirming the non-uniformity of the thickness of the film with the naked eye. Its main purpose is to provide a test method.

  In addition, the present invention can inspect the received material as soon as the material arrives, and can report the inspection status to the manufacturer. It is a further object of the present invention to provide a polarizing strip test method that can effectively eliminate the conventional problem that could only be found in the film thickness non-uniformity.

  Still further, the present invention has a low test cost, does not require expensive equipment, and does not need to process a polarizing piece that has already been processed into a product or semi-finished product, inspecting the sample itself. It is an object of the present invention to provide a method for testing a polarizing piece, in which a result can be immediately obtained and the operation is easy and does not take much time.

  In order to achieve each of the above-mentioned purposes, the present invention allows the light from the selected light source to pass through the light filtering piece, the polarizing means and the concave lens, or after passing through the light filtering piece, the mirror and the concave lens. After reaching the optical film sample and adjusting the focus by moving the optical film sample, the optical film sample is swung along the Z-axis to determine whether or not the brightness of the irradiated area changes. If it is determined that the optical film sample is wrinkled, if the determination is negative, the optical film sample is determined to be a pass sample. Provide a test method.

  According to the present invention, it is possible to clearly and easily confirm the non-uniformity of the thickness of the film by identification with the naked eye, and when the film material is received, the received film material can be inspected immediately and the test is performed. The cost is low and the need to introduce expensive inspection equipment can be eliminated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Detailed and specific description of an excellent embodiment of the present invention will be given below with reference to the accompanying drawings so that those skilled in the art can clearly recognize the purpose, characteristics, and effectiveness of the present invention. To do.
The present invention utilizes the principle of producing a phase difference due to the non-uniform thickness of the film by projecting the polarized light beam onto the transparent optical film, and projecting the emitted light beam onto a white screen. By utilizing the difference in brightness, it is determined whether or not there is a non-uniform phenomenon in the thickness of the film.

  FIG. 1 and FIG. 3 are respectively a flowchart showing a processing procedure of a test method in Embodiment 1 of the present invention and an explanatory diagram showing test equipment in Embodiment 1 of the present invention.

  1 and 3, first, the light source 11 is selected and its brightness is determined (step 101). Here, the light source 11 that can most clearly appeal the projected image color is selected and used for the test, and if the projected image color of the light source 11 being used is not the most obvious, Another light source 11 is tried again (step 102), and the light source 11 that can most clearly appeal the projected video color is selected. When the light source 11 capable of appealing the projected image color is selected and used, the process proceeds to the next step 102 to fix the optical film sample 16 (step 103).

  By irradiating and passing the projection light of the light source 11 selected and used to the polystyrene plate 12, the degree of polarization of the light is enhanced (step 104), and after passing the light through the polystyrene plate 12, the light beam By passing the light to the filter strip 13 and filtering the light beam projected from the light source 11 by the light beam filter strip 13, a light beam having a wavelength to be tested is generated by filtration. Here, the range of wavelengths to be tested is set to cover wavelengths such as red light, blue light, and green light (step 105). After filtering the wavelength of the light beam, the light beam is polarized by passing through the polarizing means 14 (step 106). When the light beam is polarized and then passed through the concave lens 15 to enlarge the light beam, it can be easily identified with the naked eye (step 107).

  By moving the optical film sample 16 while being irradiated on the light source 11, the focus is adjusted, and processing is performed so that the formed image can be identified more clearly with the naked eye (step 108). After the focus is determined and the formed image is clear, the optical film sample 16 is rotated in the counterclockwise direction along the vertical axis (Z-axis) direction (step 109). Then, it is determined whether or not there is a change in the brightness of the light beam area with the naked eye (step 110). In this step 110, the brightness of the light area is observed by directly observing the optical film sample 16 itself with the naked eye, or by observing a change in the brightness of the light area of the shaped image 18 projected on the screen 17. Determine the change in height. Here, since the TAC portion is mainly examined, if the thickness of the TAC is not uniform, a light pattern is generated in the optical film sample 16 or the projection molding image 18 and the light pattern is a single light pattern. It will not be generated by arranging in the direction of. If it is determined that there is no obvious change in the brightness of the light beam area, the process proceeds to the next step 111, where it is recognized that the optical film sample 16 is acceptable, and the process skips to step 113 and performs the test. Ends. If it is determined that there is a change in the brightness of the light beam area, the process skips to step 112 and the optical film sample 16 is recognized as a rejected product.

  FIGS. 2 and 4 are a flowchart showing a processing procedure of a test method according to the second embodiment of the present invention and an explanatory diagram showing a test facility according to the second embodiment of the present invention.

  2 and 4, first, the light source 21 is selected and its brightness is determined (step 201). Here, the light source 21 that can appeal the projected image color most clearly is selected and used for the test, and if the projected image color of the light source 21 in use is not the most obvious, While trying another light source 21 again (step 202), the light source 21 that can most clearly appeal the projected video color is selected. When the light source 21 capable of appealing the projected image color is selected and used, the process proceeds to the next step 203, and the optical film sample 26 is fixed.

  The light filtering piece 23 is allowed to pass through the projection light beam of the light source 21 selected and used, the light beam projected by the light source 21 is filtered by the light filtering piece 23, and the wavelength of the light beam to be tested is set (step 204). Here, the range of wavelengths to be tested is set to cover wavelengths such as red light, blue light, and green light. Further, after filtering and selecting the wavelength of the light beam, the light beam is reflected by the mirror 24, and the light beam is refracted in the direction of the concave lens 25 (step 205), and the refracted light beam passes through the concave lens 25 to be enlarged. (Step 206), and can be easily identified with the naked eye. Then, the focus is adjusted by moving the optical film sample 26 while being irradiated on the light source 21, and processing is performed so that the formed image 28 can be identified more clearly with the naked eye (step 207).

  After the focus is determined and the formed image 28 becomes clear, the optical film sample 26 is swung counterclockwise along the vertical axis (Z-axis) direction (step 208), and then the light beam area is observed with the naked eye. It is determined whether or not there is a change in brightness (step 209). In this step 209, the brightness of the light area is observed by directly observing the optical film sample 26 itself with the naked eye, or by observing the change in brightness of the light area of the shaped image 28 projected on the screen 27. Discriminating changes. Here, since the TAC portion is mainly examined, when the thickness of the TAC is not uniform, a light pattern is generated in the optical film sample 26 or the projection molding image 28, and the light pattern is in a single direction. It will not be generated after being arranged. If it is determined that there is no obvious change in the brightness of the light beam area, the process proceeds to the next step 211, where the optical film sample 26 is recognized as a pass product, and the process skips to step 213 to perform the test. Ends. If it is determined that there is a change in the brightness of the light beam area, the process skips to step 212 and the optical film sample 26 is recognized as a rejected product.

  In the test method according to the present invention, the defect of the non-uniformity of the thickness of the optical film can be detected immediately when the film material is brought in from the manufacturer. In addition to being able to detect defects, the superiority of the test method of the present invention is that the cost of the test is low, no expensive equipment is required, and extra processing such as film plating is performed. It is possible to test using a sample of the membrane material itself, the processing process is simple, and it has excellent industrial applicability that it does not take much time.

  Although the above-described excellent embodiments have been disclosed for the present invention, the present invention is not limited to these embodiments, and those skilled in the art can depart from the spirit and scope of the present invention without departing from the spirit and scope of the present invention. It should be understood that various changes and modifications can be made, and therefore, the protection scope of the present invention is within the scope of the appended claims.

It is a flowchart which shows the process sequence of the test method in Example 1 of this invention. It is a flowchart which shows the process sequence of the test method in Example 2 of this invention. It is explanatory drawing which shows the test equipment in Example 1 of this invention. It is explanatory drawing which shows the test equipment in Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Light source 12 Polystyrene plate 13 Light filtration piece 14 Polarization means 15 Concave lens 16 Sample 17 Screen 18 Molding image 21 Light source 23 Light filtration piece 24 Mirror 25 Concave lens 26 Sample 27 Screen 28 Molding image

Claims (8)

Step 1 of selecting a light source;
A step of determining whether or not the light source can appeal the clearest projected video color and proceeding to the next step when an affirmative determination is made, and processing to return to the step 1 when a negative determination is made 2,
Fixing the optical film sample and processing to proceed to the next step; and
Irradiating the optical film sample with a light beam from the light source after the comparison through a test device, and processing to proceed to the next step; and
Adjusting the focus by moving the optical film sample and processing to proceed to the next step; and
Turning the optical film sample along the Z axis and processing to proceed to the next step; and
It is determined whether or not the brightness in the illuminated area has changed. If a negative determination is made, the process proceeds to the next step 8. If an affirmative determination is made, the process skips to step 9. Step 7 to
Determining that the optical film sample is acceptable and processing to skip to step 10; and
Determining that the optical film sample is a rejected product and processing to proceed to the next step; and
A polarizing strip test method characterized by comprising:   The method for testing a polarizing piece according to claim 1, wherein the test apparatus according to step 4 uses one of a reflective test apparatus and a penetrating detection apparatus. The test device uses a penetrating detection device,
Step 4B in which light rays from the light source pass through the light filtration piece;
Passing the polarizing means through the light source 4C;
Passing the concave lens through the light source 4D;
The polarizing strip test method according to claim 2, further comprising:   When using the said penetration type test device, before the said step 4B, the step 4A through which the light beam from a light source passes a polyethylene-made plate body is further added, The polarizing piece of Claim 3 characterized by the above-mentioned. Test method.   4. The method for testing a polarizing piece according to claim 3, wherein, when the penetration type test apparatus is used, a step 4E for irradiating the screen with a light beam is further added after the step 4D. If the test device uses a reflective detector,
Step 4A ′ in which the light beam from the light source passes through the light filter piece,
Step 4B ′ where the light rays from the light source are reflected by the mirror;
Step 4C ′ where the light from the light source passes through the concave lens;
The polarizing strip test method according to claim 2, further comprising:   7. The method of testing a polarizing piece according to claim 6, wherein when the reflection type test apparatus is used, a step 4D 'of irradiating the screen with a light beam is further added after the step 4C'.   2. The polarizing strip test method according to claim 1, wherein the wavelength range to be tested by the test method can simultaneously cover the wavelength ranges of red light, blue light, and green light.