WO2022091686A1 - 配向膜露光装置用の測定機構、および配向膜露光装置の調整方法 - Google Patents
配向膜露光装置用の測定機構、および配向膜露光装置の調整方法 Download PDFInfo
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- WO2022091686A1 WO2022091686A1 PCT/JP2021/036101 JP2021036101W WO2022091686A1 WO 2022091686 A1 WO2022091686 A1 WO 2022091686A1 JP 2021036101 W JP2021036101 W JP 2021036101W WO 2022091686 A1 WO2022091686 A1 WO 2022091686A1
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- light source
- illuminance
- light
- polarizing element
- exposed surface
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- 238000005259 measurement Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 23
- 230000010287 polarization Effects 0.000 claims abstract description 37
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- 238000001615 p wave Methods 0.000 claims description 9
- 238000005286 illumination Methods 0.000 abstract 1
- 239000004973 liquid crystal related substance Substances 0.000 description 16
- 238000012986 modification Methods 0.000 description 13
- 230000004048 modification Effects 0.000 description 13
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- 238000001816 cooling Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B11/272—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes using photoelectric detection means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0266—Field-of-view determination; Aiming or pointing of a photometer; Adjusting alignment; Encoding angular position; Size of the measurement area; Position tracking; Photodetection involving different fields of view for a single detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0429—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using polarisation elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
Definitions
- the present invention relates to a measurement mechanism for an alignment film exposure apparatus mainly used for exposure when manufacturing a liquid crystal panel, and a method for adjusting the alignment film exposure apparatus.
- liquid crystal display When using a liquid crystal display as a TN type display panel, it does not operate normally just by enclosing the liquid crystal between two glass substrates and applying a voltage to the transparent electrodes formed on the inner surfaces of these glass plates. This is because the liquid crystal molecules are in a disjointed state.
- the liquid crystal In order for the liquid crystal to operate in the normal TN method, it is necessary to orient the liquid crystal molecules in a certain direction and to make the rising direction of the liquid crystal molecules constant. Specifically, the liquid crystal molecules are oriented in a direction tilted by about 3 ° with respect to the glass substrate, and this tilt angle is called a pretilt angle.
- one glass substrate is arranged so as to be oriented in the X direction, and the other glass substrate facing the other is arranged in the Y direction orthogonal to the X direction.
- a liquid crystal alignment treatment is required for manufacturing a liquid crystal panel, and a rubbing treatment for physically rubbing the surface of a glass substrate has been performed for some time (for example, Patent Document 1).
- This rubbing treatment is a treatment method for forming a film capable of orienting liquid crystal molecules in a certain direction by rubbing an organic polymer film formed on a glass substrate with a cloth having long hairs in a predetermined direction. Is.
- LCD panels With the spread of rubbing processing and the generalization of the TN method, which has a fast response speed, LCD panels can be mass-produced at low cost with stable performance, and are used for display monitors and game machines for OA equipment such as personal computers. There is a history that LCD monitors have become widespread as monitors.
- the rubbing method has problems related to reliability, such as poor uniformity, the possibility of electrostatic breakdown of the TFT, and adhesion of powder dust generated during rubbing.
- the pre-tilt angle that can be achieved by the rubbing method is about 3 ° in the TN method that represents the horizontally oriented liquid crystal mode as described above, and it constitutes a liquid crystal mode display panel that supports high-speed response with low voltage drive. There was a difficulty in doing so.
- an alignment film exposure apparatus capable of performing photoalignment processing has been proposed at present, and a mercury lamp or an LED is used as a light source of this alignment film exposure apparatus.
- a measurement mechanism and adjustment method are required to efficiently measure the illuminance of the alignment film exposure apparatus and adjust the polarizing element.
- the present invention has been made in view of the above-mentioned problems, and an object thereof is to measure the illuminance of an alignment film exposure apparatus and adjust a polarizing element, which can perform optical alignment processing with a simple and inexpensive configuration instead of a rubbing method. It is an object of the present invention to provide a measuring mechanism for efficient implementation, and a method for adjusting an alignment film exposure apparatus.
- Light source and A measurement mechanism used in an alignment film exposure apparatus including a polarizing element that receives light from the light source and irradiates the transmitted light onto a work placed on an exposed surface. It is equipped with an illuminance meter placed on the exposed surface. The illuminance meter is provided with a measuring mechanism for measuring the exposure surface illuminance on the exposed surface, the extinction ratio, the deviation of the polarization axis in the polarizing element, and the irradiation angle.
- the exposed surface illuminance is measured at a plurality of points by moving the illuminometer within the exposed surface.
- the extinction ratio is After arranging the reference polarizing element on the surface side of the illuminometer toward the light source, The illuminance of the light transmitted through the reference polarizing element in a state of being directed in a direction substantially orthogonal to the polarization direction of the polarizing element is defined as the p-wave intensity. The illuminance of the light transmitted through the reference polarizing element in a state of being rotated by 90 ° from the state where the p-wave intensity is measured is defined as the s-wave intensity. Calculated by dividing the p-wave intensity value by the s-wave intensity value.
- the deviation of the polarization axis in the polarizing element means the deviation of the polarization axis with respect to a predetermined polarization direction.
- the light transmitted through the reference polarizing element in the reference state directed in a predetermined direction is used as the illuminance reference. It is confirmed by measuring the illuminance of light when the reference changing element is rotated by a predetermined angle from the reference state and comparing it with the illuminance reference.
- the irradiation angle is The illuminance at the position where the central optical axis of each light source element constituting the light source and the exposed surface intersect is measured by the illuminometer. Among the results of measuring the illuminance a plurality of times by changing the angle of the illuminometer toward the light source element. This is the angle when the illuminance is the highest.
- Light source and A measurement mechanism used in an alignment film exposure apparatus including a polarizing element that receives light from the light source and irradiates the transmitted light onto a work placed on an exposed surface. It is provided with a photometer that is arranged on the exposed surface and continuously measures the amount of light received from the light source while moving in the scanning direction of the work. The photometer generates a pulse signal with a frequency corresponding to the magnitude of the analog signal generated by receiving the light from the light source, and the light source is used for the entire period of the movement based on the number of the pulse signals.
- a measuring mechanism characterized by calculating the amount of received light is provided.
- Light source and A method for adjusting an alignment film exposure apparatus including a plurality of polarizing elements arranged adjacent to each other, which receives light from the light source and irradiates the transmitted light on a work placed on an exposed surface.
- the illuminometer arranged on the exposed surface and the reference polarizing element arranged on the surface side of the illuminometer facing the light source receive light from two polarizing elements arranged adjacent to each other.
- an adjusting method of an alignment film exposure apparatus that adjusts the polarization directions of the two polarizing elements while checking the illuminance indicated by the illuminometer.
- the measuring mechanism it is possible to measure the exposure surface illuminance on the exposed surface, the extinction ratio, the deviation of the polarization axis in the polarizing element, and the irradiation angle by using the illuminance meter.
- the adjustment method of the alignment film exposure apparatus it is possible to adjust the polarization directions of the two polarizing elements with one illuminometer.
- FIG. It is a figure which shows the alignment film exposure apparatus 10 to which this invention is applied. It is a figure which shows the measuring mechanism 100 to which this invention was applied. It is a figure which shows the alignment film exposure apparatus 10 in the state which arranged the measuring mechanism 100. It is a figure which shows the example of the measurement position Y on the exposure surface A by the measurement mechanism 100. It is a figure which shows the other measuring mechanism 100 to which this invention is applied. It is a figure which shows the alignment film exposure apparatus 10 in the state which arranged the measuring mechanism 100 which concerns on modification 1.
- FIG. It is a figure which shows the moving direction and the polarization direction of a reference polarizing element 120. It is a figure which shows the moving direction and the polarization direction of a reference polarizing element 120.
- FIG. 1 It is a figure which shows the state which adjusts three polarizing elements 14a, 14b, 14c by the measuring mechanism 100. It is a figure which shows the measuring mechanism 100 provided with the photometer 150 which concerns on modification 5. It is a figure which shows the structure of the photometer 150. It is a figure which shows the state which the position of the center of a light receiving surface of an illuminometer 110 and the position of the center of a light receiving surface of a reference polarizing element 120 coincide with each other, and a loss occurs. It is a figure which shows the state which the loss is minimized by shifting the position of the center of a light receiving surface of an illuminometer 110 and the position of the center of a light receiving surface of a reference polarizing element 120.
- the alignment film exposure apparatus 10 In which the measuring mechanism 100 is used will be described below.
- the alignment film exposure apparatus 10 generally includes a light source 12, a polarizing element 14, an optical filter 30, and a cover member 40.
- the optical filter 30 and the cover member 40 are not essential components for the alignment film exposure apparatus 10.
- the light source 12 is a member that irradiates the exposure light L toward the exposure surface A on which the work (exposure target) X is placed, and a plurality of LEDs 16 are used in this embodiment. Since these LEDs 16 irradiate the work X moving in a certain direction on the exposure surface A with the exposure light L so as to scan, the light sources 12 are plurality of in the direction orthogonal to the moving direction of the work X. It is formed by arranging the LEDs 16 of the above in substantially series.
- the alignment film exposure apparatus 10 may move to the work X to irradiate the exposure light L, or both the work X and the alignment film exposure apparatus 10 may move.
- each LED 16 constituting the light source 12 has a first angle ⁇ 1 (that is, an incident angle ⁇ 1) with respect to the work X so that the optical axis CL of these LEDs 16 has a first angle ⁇ 1 (that is, an incident angle ⁇ 1) with respect to the work X (that is, an exposed surface). It is arranged at an angle (relative to A).
- the light source 12 is not limited to the LED 16, and for example, a single-lamp type discharge lamp or a multi-lamp type discharge lamp may be used.
- the polarizing element 14 is an element that transmits and polarizes only a light component that vibrates in one direction among the light emitted from the light source 12, and in this embodiment, a wire grid polarizing element is used.
- the wire grid polarizing element has a wire grid formed on one surface of a transparent substrate (glass substrate).
- the surface 18 on which the wire grid is formed may be the surface of the polarizing element 14 on the light source 12 side or the surface opposite to the light source 12. Further, it is preferable that the polarizing element 14 is arranged so as to be parallel to the work X (exposed surface A).
- the optical filter 30 is arranged between the light source 12 and the polarizing element 14, and is a member that selectively transmits light L having a predetermined wavelength or more among the light L emitted from the light source 12 and has a surface surface. A wavelength selection film is formed on the surface. Further, it is preferable that the optical filter 30 is arranged so as to be parallel to the work X (exposed surface A) like the polarizing element 14. As the optical filter 30, if the conditions described below are satisfied, a long-pass filter that transmits light of a predetermined wavelength or higher, or a long-pass filter that transmits light in a predetermined wavelength range and has a longer wavelength and a shorter wavelength than that of the optical filter 30 are transmitted. A bandpass filter that blocks light of wavelength can be used. Further, the optical filter 30 may be arranged on the side opposite to the light source 12 side of the polarizing element 14.
- the cover member 40 is, for example, a glass plate that transmits light L from the light source 12, and is arranged substantially parallel to the work X at a position facing the formation surface 18 of the wire grid in the polarizing element 14. That is, when the formation surface 18 of the wire grid in the polarizing element 14 is formed on the side opposite to the light source 12 side as shown in the drawing, the cover member 40 is also arranged on the side opposite to the light source 12 side in the polarizing element 14. To. On the contrary, when the formation surface 18 of the wire grid in the polarizing element 14 is formed on the light source 12 side (not shown), the cover member 40 is also arranged on the light source 12 side in the polarizing element 14.
- the surface (both sides) of the cover member 40 may not be subjected to antireflection treatment such as an antireflection film, but it is preferable to perform antireflection treatment such as an antireflection film on one or both surfaces. be.
- the space S between the cover member 40 and the formation surface 18 of the wire grid in the polarizing element 14 is sealed.
- a holding frame 42 for holding the peripheral edges of the cover member 40 and the polarizing element 14 may be provided, and the holding frame 42 may seal the space S between the cover member 40 and the wire grid forming surface 18 of the polarizing element 14. Conceivable.
- the wire grid is heated by the light L from the light source 12, and the temperature of the enclosed space is unlikely to be damaged by the formation surface 18 of the wire grid. Is.
- the members constituting the space S such as the cover member 40, the polarizing element 14, or the holding frame 42 may be cooled by a method such as forced air cooling or water cooling.
- the measuring mechanism 100 includes an illuminance meter 110 arranged on the exposed surface A.
- the illuminance meter 110 measures the illuminance on the exposed surface.
- the illuminance meter 110 is composed of an illuminance meter main body 112 and a plurality of illuminance analyzers 114 arranged and mounted in a row on the upper surface of the illuminance meter main body 112. Further, it is preferable that the height from the exposed surface A to the surface of the illuminance measuring element 114 is the same as the thickness of the work X (that is, the height from the exposed surface A to the surface of the work X).
- the plurality of illuminance meters 114 are arranged so as to be arranged in a direction substantially orthogonal to the moving direction of the light source 12 with respect to the exposed surface A. It is preferable.)
- the illuminance meter 110 is moved in the moving direction of the light source 12 in the exposed surface A, and the illuminance is measured by the illuminance meter 114 for each predetermined moving distance, as shown in FIG.
- the illuminance from the light source 12 on the exposed surface A can be measured at the grid-shaped measurement position Y. If necessary, the light source 12 may be moved relative to the exposed surface A.
- the measuring mechanism 100 includes an illuminance meter moving mechanism 130 that moves the illuminometer 110 in a linear direction, and an illuminometer angle setting mechanism 140 that can set an angle at which the illuminometer 110 faces the light source 12. I have.
- the illuminance meter 110 is moved in the exposure surface A in the moving direction of the light source 12 as described above, and at the same time, for example, the direction of the measuring mechanism 100 is changed to be orthogonal to the moving direction.
- the illuminance from the light source 12 on the exposed surface A can be measured at the measurement position Y in the shape of a grid.
- the illuminance from the light source 12 on the exposed surface A is measured at the measurement positions Y arranged in the moving direction as an example. be able to.
- the measuring mechanism 100 may measure the extinction ratio in place of the above-mentioned exposed surface illuminance or in addition to the exposed surface illuminance.
- the measuring mechanism 100 includes a reference polarizing element 120 as shown in FIG. 6 in addition to the illuminance meter 110.
- the reference polarizing element 120 is a polarizing element having a characteristic that light polarized in a specific direction passes well, but light polarized in a direction perpendicular to the light hardly passes therethrough.
- the illuminance is measured by the illuminance meter 114 from the light source 12 according to the following procedure.
- the reference polarizing element 120 is set to be oriented in a direction substantially orthogonal to the polarization direction by the polarizing element 14, and the reference polarizing element 120 in this state is transmitted to the illuminance meter 110.
- the illuminance of the light received in is defined as the p-wave intensity.
- the p-wave intensity is rotated by 90 ° from the measured state (in this case, the polarization axis direction is the direction orthogonal to the polarization direction by the polarizing element 14).
- the illuminance of the light transmitted through the reference polarizing element 120 and received by the luminometer 110 is defined as the s wave intensity.
- the extinction ratio can be calculated by dividing the value of the p-wave intensity thus obtained by the value of the s-wave intensity.
- the extinction ratio may be measured at only one point on the exposed surface A (for example, the center point of the exposed surface A), or at a plurality of points on the exposed surface A. In this case, the light source 12 may be moved relative to the exposed surface A, if necessary.
- the measuring mechanism 100 may measure the deviation of the polarization axis in the polarizing element 14.
- the measuring mechanism 100 includes the reference polarizing element 120 in addition to the illuminometer 110 (see FIG. 6), as in the modification 1 described above.
- the deviation of the polarization axis in the polarizing element 14 means the deviation of the polarization axis with respect to a predetermined polarization direction.
- the reference polarizing element 120 is arranged on the surface side of the illuminometer 110 toward the light source 12.
- the light transmitted through the reference polarizing element 120 in the reference state directed in a predetermined direction (for example, a direction substantially orthogonal to the polarization direction by the polarizing element 14) is used as an illuminance reference, and then a predetermined state is determined from this reference state. This is confirmed by measuring the illuminance of the light when the reference polarizing element 120 is rotated while being parallel to the exposure surface A for each angle and comparing it with the illuminance reference.
- the illuminance of light when the reference polarizing element 120 is rotated by a predetermined angle (10 °) clockwise and counterclockwise from the reference state in a direction overlooking the exposed surface A is as shown in FIG.
- the result it can be said that there is no deviation in the polarization axis in the polarizing element 14 (the polarization axis coincides with the direction substantially orthogonal to the relative moving direction of the light source 12 with respect to the illuminance meter 110). If the result is as shown in FIG.
- the polarization axis is deviated by 10 ° clockwise from the direction substantially orthogonal to the relative moving direction of the light source 12 with respect to the illuminance meter 110 in the direction of looking down on the exposed surface A. It can be said that.
- the deviation of the polarization axis may be measured at only one point on the exposed surface A (for example, the center point of the exposed surface A), or at a plurality of points in the exposed surface A. In this case, the light source 12 may be moved relative to the exposed surface A, if necessary.
- the measuring mechanism 100 may measure the irradiation angle.
- the measuring mechanism 100 includes the reference polarizing element 120 in addition to the illuminance meter 110, as in the above-described modification 1, but the reference polarizing element 120 is an essential component. not.
- the irradiation angle is an important factor for achieving a stable and large angle with respect to the appearance of the pretilt angle, which is the performance of the photoalignment film. This irradiation angle is determined by the angle at which the light source 12 is fixed with respect to the exposed surface A.
- the irradiation angle is measured by the following procedure.
- the light source 12 is composed of a plurality of "light source elements 13".
- the light source element 13 is a unit in which a plurality of LEDs thereof are grouped together.
- the light source element 13 corresponds to one discharge lamp.
- the illuminance is the highest among the results of measuring the illuminance a plurality of times by changing the angle toward the light source element 13 by the illuminance meter 110 using the illuminance meter angle setting mechanism 140 shown in FIG.
- the angle is the illuminance angle of the light source element 13 with respect to the exposed surface A.
- the above-mentioned irradiation angle may be measured at only one point on the exposed surface A (for example, the center point of the exposed surface A), or may be performed at a plurality of points on the exposed surface A. In this case, the light source 12 may be moved relative to the exposed surface A, if necessary.
- the measuring mechanism 100 can also be used for adjusting the position of the polarizing element 14.
- the area of the light source 12 is increased accordingly.
- the area of the light source 12 is orthogonal to the moving direction. It becomes long in the direction of doing.
- the light source elements 13 constituting the light source 12 can be dealt with by arranging a necessary number, but when a plurality of polarizing elements 14a and 14b are used to correspond to the large light source 12, the polarizing elements 14a and 14b of the respective polarizing elements 14a and 14b are used. It is necessary to adjust the polarization directions to match each other.
- the measuring mechanism 100 is composed of an illuminance meter 110 and a reference polarizing element 120, and the reference polarizing element 120 and the illuminance meter 110 are used from two polarizing elements 14a and 14b arranged adjacent to each other. Receive the light of.
- the polarization directions of the two polarizing elements 14a and 14b can be adjusted by adjusting the polarization directions of the two polarizing elements 14a and 14b while checking the illuminance indicated by the illuminometer 110.
- the procedure for adjusting the three polarizing elements 14a, 14b, and 14c will be described as an example.
- the measuring mechanism 100 is arranged at the boundary C between the first polarizing element 14a and the second polarizing element 14b.
- the illuminance of the light (polarized light) transmitted through the first polarizing element 14a and the second polarizing element 14b is measured.
- the second polarizing element 14b is moved to adjust so that the illuminance received by the measuring mechanism 100 is maximized.
- only the first polarizing element 14a is moved this time to adjust so that the illuminance received by the measuring mechanism 100 is maximized.
- the first polarizing element 14a and the second polarizing element 14b could be adjusted so as to have the optimum polarization direction while maintaining the mutual relationship.
- the measuring mechanism 100 is arranged at the boundary D between the second polarizing element 14b and the third polarizing element 14c, and only the third polarizing element 14c is moved to maximize the illuminance received by the measuring mechanism 100. Adjust so that.
- the first polarizing element 14a, the second polarizing element 14b, and the third polarizing element 14c can be adjusted so as to have the optimum polarization direction while maintaining the mutual relationship.
- the measuring mechanism 100 may measure the amount of light from the light source 12.
- the measuring mechanism 100 is provided with a photometer 150 instead of the illuminance meter 110, as shown in FIG.
- the photometer 150 has an illuminance sensor 152, a converter 154, and an integration display device 156.
- the illuminance sensor 152 receives the light from the light source 12 and transmits an analog signal (for example, voltage) according to the magnitude of the illuminance to the outside.
- an analog signal for example, voltage
- a phototransistor is used for the illuminance sensor 152.
- the converter 154 generates a pulse signal having a frequency corresponding to the magnitude of the analog signal sent from the illuminance sensor 152 and transmits it to the outside.
- the integration display device 156 receives the pulse signal sent from the converter 154, calculates the amount of light based on the preset "relationship between the frequency of the pulse signal and the amount of light", and displays the display screen. The value of the light amount is displayed on 158. Further, the integrated display device 156 can also calculate an integrated value of the amount of light measured by the illuminance sensor 152 within a certain period of time.
- the amount of light emitted from the light source 12 to the exposed surface A is measured as follows using such a photometer 150.
- the illuminance sensor 152 After turning on the light source 12, move the illuminance sensor 152 from the standby position to the measurement start position.
- the sensing position of the illuminance sensor 152 coincides with the surface position of the work X, which is slightly closer to the light source 12 from the exposed surface A.
- the illuminance sensor 152 is horizontally moved from the measurement start position to the measurement end position in the scanning direction. During this period, the moving speed of the illuminance sensor 152 is preferably constant.
- the illuminance sensor 152 continuously transmits an analog signal according to the illuminance of the light received from the light source 12, and the converter 154 receiving the continuous analog signal also corresponds to the magnitude of the analog signal. Continue to send frequency pulse signals.
- the number of pulse signals transmitted during the scan period is integrated by the integrated display device 156, and the integrated light amount received by the illuminance sensor 152 during the scan period is calculated based on the integrated pulse signal number. can do.
- the amount of light can be accurately measured even by the light source 12 using the LED 16 having a relatively small amount of light emission. Can be measured.
- the position of the center of the light receiving surface of the reference polarizing element 120 is shifted with respect to the position of the center of the light receiving surface of the illuminometer 110 when viewed from the exposed surface A looking down, specifically, as shown in FIG.
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Abstract
Description
光源と、
前記光源からの光を受け、透過させた前記光を露光面に載置したワークに照射する偏光素子とを備える配向膜露光装置に使用される測定機構であって、
前記露光面に配置される照度計を備えており、
前記照度計は、前記露光面における露光面照度と、消光比と、前記偏光素子における偏光軸のズレと、照射角とを測定することを特徴とする
測定機構が提供される。
前記露光面照度は、前記照度計を前記露光面内で移動させることによって複数の点で測定する。
前記消光比は、
前記照度計における前記光源に向かう面側に基準偏光素子を配置した後、
前記偏光素子による偏光方向に略直交する方向に向けた状態の前記基準偏光素子を透過してきた光の照度をp波強度とし、
前記p波強度を測定した状態から90°回転させた状態の前記基準偏光素子を透過してきた光の照度をs波強度として、
p波強度の値をs波強度の値で除すことによって算出する。
前記偏光素子における偏光軸のズレとは、所定の偏光方向に対する偏光軸のズレをいい、
前記照度計における前記光源に向かう面側に基準偏光素子を配置した後、
所定の方向に向けた基準状態の前記基準偏光素子を透過してきた光を照度基準とし、
前記基準状態から所定の角度ずつ前記基準変更素子を回転させたときの光の照度を測定して前記照度基準と比較することによって確認する。
照射角は、
前記光源を構成する個々の光源素子の中心光軸と前記露光面とが交差する位置の照度を前記照度計で測定し、
前記照度計が前記光源素子に向かう角度を変えて前記照度を複数回測定した結果のうち、
前記照度が最も高いときの前記角度である。
光源と、
前記光源からの光を受け、透過させた前記光を露光面に載置したワークに照射する偏光素子とを備える配向膜露光装置に使用される測定機構であって、
前記露光面に配置され、前記ワークのスキャン方向に移動しつつ前記光源から受ける光量を連続的に測定する光量計を備えており、
前記光量計は、前記光源からの光を受けることで発生するアナログ信号の大きさに応じた頻度のパルス信号を発生させて、前記パルス信号の数に基づいて前記移動の期間全体で前記光源から受けた光量を算出することを特徴とする
測定機構が提供される。
光源と、
前記光源からの光を受け、透過させた前記光を露光面に載置したワークに照射する互いに隣接して並べられた複数の偏光素子とを備える配向膜露光装置の調整方法であって、
前記露光面に配置される照度計と前記照度計における前記光源に向かう面側に配置された基準偏光素子とで互いに隣接して並んだ2つの前記偏光素子からの光を受け、
前記照度計が示す照度を確認しつつ、2つの前記偏光素子の偏光方向をそれぞれ調整する
配向膜露光装置の調整方法が提供される。
本発明が適用された実施形態に係る測定機構100を説明する前に、当該測定機構100が用いられる配向膜露光装置10について以下に説明する。配向膜露光装置10は、図1に示すように、大略、光源12と、偏光素子14と、光学フィルター30と、カバー部材40とを備えている。なお、光学フィルター30やカバー部材40は、配向膜露光装置10にとって必須の構成要素ではない。
次に、測定機構100の構成について説明する。本実施形態に係る測定機構100は、露光面Aに配置される照度計110を備えている。
また、測定機構100は、上述した露光面照度に代えて、あるいは、露光面照度に加えて、消光比を測定してもよい。この場合、測定機構100は、照度計110に加えて、図6に示すように、基準偏光素子120を備えている。
また、測定機構100は、偏光素子14における偏光軸のズレを測定してもよい。この場合も、上述した変形例1と同様に、測定機構100は、照度計110に加えて、基準偏光素子120を備えている(図6参照)。
さらに、測定機構100は、照射角を測定してもよい。この場合も、上述した変形例1と同様、図11に示すように測定機構100は、照度計110に加えて基準偏光素子120を備えているが、この基準偏光素子120は必須の構成要素ではない。
測定機構100は、偏光素子14の位置調整にも使用できる。ワークXの大きさが大きい場合、それに応じて光源12の面積も大きくなる。例えば、露光面AにワークXが載置され、光源12がワークXに対して移動(スキャン)するタイプの配向膜露光装置10である場合、光源12の面積は、当該移動方向に対して直交する方向に長いものになる。
また、測定機構100は、光源12からの光量を測定してもよい。この場合、測定機構100は、照度計110に変えて、図14に示すように、光量計150を備えている。
なお、基準偏光素子120を用いる全ての変形例においていえることであるが、基準偏光素子120を透過した光を照度計110で受けて照度を測定する場合、光源12からの光はこれら照度計110や基準偏光素子120の受光面に対して第1の角度θ1をもって入射する。このため、露光面Aを見おろす向きにおいて照度計110の受光面中心の位置と基準偏光素子120の受光面中心の位置とが互いに一致していると図16に示すように光源12からの光の取りこぼし(ロス)が発生する。
30…光学フィルター
40…カバー部材、42…保持枠
100…測定機構、110…照度計、112…照度計本体、114…照度測定子、120…基準偏光素子、130…照度計移動機構、140…照度計角度設定機構、150…光量計、152…照度センサ、154…変換器、156…積算表示装置
X…ワーク(露光対象物)、Y…測定位置、A…露光面、L…露光用光、CL…(LED16の)光軸、θ1…第1の角度、S…(カバー部材40とワイヤーグリッドの形成面18との間の)空間
Claims (7)
- 光源と、
前記光源からの光を受け、透過させた前記光を露光面に載置したワークに照射する偏光素子とを備える配向膜露光装置に使用される測定機構であって、
前記露光面に配置される照度計を備えており、
前記照度計は、前記露光面における露光面照度と、消光比と、前記偏光素子における偏光軸のズレと、照射角とを測定することを特徴とする
測定機構。 - 前記露光面照度は、前記照度計を前記露光面内で移動させることによって複数の点で測定する
請求項1に記載の測定機構。 - 前記消光比は、
前記照度計における前記光源に向かう面側に基準偏光素子を配置した後、
前記偏光素子による偏光方向に略直交する方向に向けた状態の前記基準偏光素子を透過してきた光の照度をp波強度とし、
前記p波強度を測定した状態から90°回転させた状態の前記基準偏光素子を透過してきた光の照度をs波強度として、
p波強度の値をs波強度の値で除すことによって算出する
請求項1に記載の測定機構。 - 前記偏光素子における偏光軸のズレとは、所定の偏光方向に対する偏光軸のズレをいい、
前記照度計における前記光源に向かう面側に基準偏光素子を配置した後、
所定の方向に向けた基準状態の前記基準偏光素子を透過してきた光を照度基準とし、
前記基準状態から所定の角度ずつ前記基準変更素子を回転させたときの光の照度を測定して前記照度基準と比較することによって確認する
請求項1に記載の測定機構。 - 照射角は、
前記光源を構成する個々の光源素子の中心光軸と前記露光面とが交差する位置の照度を前記照度計で測定し、
前記照度計が前記光源素子に向かう角度を変えて前記照度を複数回測定した結果のうち、
前記照度が最も高いときの前記角度である
請求項1に記載の測定機構。 - 光源と、
前記光源からの光を受け、透過させた前記光を露光面に載置したワークに照射する偏光素子とを備える配向膜露光装置に使用される測定機構であって、
前記露光面に配置され、前記ワークのスキャン方向に移動しつつ前記光源から受ける光量を連続的に測定する光量計を備えており、
前記光量計は、前記光源からの光を受けることで発生するアナログ信号の大きさに応じた頻度のパルス信号を発生させて、前記パルス信号の数に基づいて前記移動の期間全体で前記光源から受けた光量を算出することを特徴とする
測定機構。 - 光源と、
前記光源からの光を受け、透過させた前記光を露光面に載置したワークに照射する互いに隣接して並べられた複数の偏光素子とを備える配向膜露光装置の調整方法であって、
前記露光面に配置される照度計と前記照度計における前記光源に向かう面側に配置された基準偏光素子とで互いに隣接して並んだ2つの前記偏光素子からの光を受け、
前記照度計が示す照度を確認しつつ、2つの前記偏光素子の偏光方向をそれぞれ調整する
配向膜露光装置の調整方法。
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