WO2020067243A1 - 指紋認証センサー付き画像表示装置 - Google Patents
指紋認証センサー付き画像表示装置 Download PDFInfo
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- WO2020067243A1 WO2020067243A1 PCT/JP2019/037763 JP2019037763W WO2020067243A1 WO 2020067243 A1 WO2020067243 A1 WO 2020067243A1 JP 2019037763 W JP2019037763 W JP 2019037763W WO 2020067243 A1 WO2020067243 A1 WO 2020067243A1
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- display device
- fingerprint authentication
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
Definitions
- the present invention relates to an image display device having a fingerprint authentication sensor and having an alignment film on the viewing side.
- a surface protection film has been bonded to an image display device for surface protection.
- the surface protective film not only prevents the surface from being scratched but also has the purpose of preventing scattering when the image cell or the surface glass plate is broken, and an oriented film such as biaxially stretched polyester having excellent impact resistance has been used.
- an oriented film such as biaxially stretched polyester having excellent impact resistance has been used.
- a biaxially stretched polyester film has been used also as a film for preventing scattering of a member of a touch sensor or a member of glass.
- a face authentication system or a fingerprint authentication system has been adopted in order to ensure high security (Patent Documents 1 and 2).
- a mobile terminal in order to enlarge the screen under the restriction of the size of mobile, the entire body is used as a display screen, and an authentication system is provided in the screen (an image display area as viewed from the viewer side and behind it).
- a sensor In particular, in an organic electroluminescence (organic EL) image display device, a fingerprint authentication sensor can be operated through a gap between pixels of an image display cell, and such a system has been widespread.
- a polarizing plate is provided on the viewing side of a sensor for authentication.
- an alignment film is provided on the viewing side of the polarizing plate.
- the fingerprint authentication system sometimes did not operate (recognize) or malfunctioned (misrecognized value), particularly when a biaxially oriented polyester film was used as the oriented film.
- an object of the present invention is to provide an image display device which has a fingerprint authentication system and further has an orientation film, and in which the fingerprint authentication system normally operates.
- a typical present invention is as follows.
- Item 1 An image display device having a polarizing plate on the viewing side of the fingerprint authentication sensor and having an alignment film on the viewing side of the polarizing plate, An image display device, wherein an angle between a main orientation direction of the alignment film and an extinction axis direction of a polarizer of the polarizing plate is 0 ° ⁇ 6 ° or less, or 90 ° ⁇ 6 ° or less. (In the above, “less than or equal to” means only the value following “ ⁇ ”.)
- an image display device having a polarizing plate on the viewing side of a fingerprint authentication sensor it is possible to provide an image display device in which a fingerprint authentication system normally operates even when an alignment film is present on the viewing side of the polarizing plate. .
- the fingerprint authentication sensor unit is installed outside the display screen (image display unit).
- a fingerprint authentication sensor unit is installed in a display screen (image display unit). It is a sectional view of an example when a fingerprint authentication sensor part is installed in a display screen (image display part).
- the present invention is an image display device having a polarizing plate on the viewing side of a fingerprint authentication sensor and an alignment film on the viewing side.
- the fingerprint authentication sensor fingerprint authentication sensor unit
- the fingerprint authentication sensor may be installed outside the display screen, or may be installed inside the display screen (in the image display area as viewed from the viewer side and behind it).
- the outside of the display screen referred to here is the state of FIG. 1
- the inside of the display screen is the state of FIG.
- the type installed in the display screen is also called a screen-embedded type.
- the outside of the fingerprint authentication sensor is installed at the back of the screen when viewed from the viewing side.
- FIG. 3 the outside of the fingerprint authentication sensor is installed at the back of the screen when viewed from the viewing side.
- an image display cell for example, an organic EL cell
- a polarizing plate (a circular polarizing plate is preferable when the image display cell is an organic EL cell) is arranged on the viewing side of the image display cell.
- an alignment film is disposed via an adhesive layer.
- an image display device of a type in which a fingerprint authentication sensor is installed in a display screen is an object of the present invention.
- An object of the present invention is an image display device in which a fingerprint authentication sensor is provided outside a display screen, in which a polarizing plate is provided so as to cover the fingerprint authentication sensor.
- the image display device is preferably a smartphone, mobile PC, PDA, mobile phone, game machine, camera, electronic dictionary, or the like.
- the image display cell used in the image display device of the present invention is not particularly limited, but a liquid crystal display cell and an organic EL (OLED) cell are preferable examples because they can be reduced in size and thickness.
- the organic EL cell is a preferable example because a fingerprint authentication sensor can be operated through a gap between pixels of the cell.
- the fingerprint authentication sensor includes an optical type, an ultrasonic type, a capacitance type, an electric field intensity measurement type, a pressure-sensitive type, and a heat-sensitive type, and is not particularly limited. Formula or ultrasonic formula is preferred, and optical formula is particularly preferred.
- An optical fingerprint sensor is commercially available from Synaptics under the trade name “Clear ID”, for example.
- an ultrasonic fingerprint recognition sensor is commercially available from Qualcomm Technologies under the trade name “Qualcomm Fingerprint Sensors”.
- the image display device is in a state where the polarizing plate is provided on the viewing side of the fingerprint authentication sensor.
- the polarizing plate generally includes a polarizer having a function of generating polarized light and a polarizer protective film for protecting the polarizer, but the polarizer protective film is laminated only on one surface of the polarizer. Or a polarizer only.
- the polarizer include a thin film in which iodine and an organic dichroic dye are adsorbed on uniaxially oriented polyvinyl alcohol, and an alignment film including a liquid crystal compound and an organic dichroic dye. It can be used without.
- the polarizer protective film is not particularly limited, but an unstretched or stretched film of cellulose type, polyester type, cyclic polyolefin type, acrylic type, polycarbonate type, etc. can be used.
- the extinction axis of the polarizer and the main orientation direction of the stretched film are preferably parallel or perpendicular.
- parallel or perpendicular means that the angle between the extinction axis of the polarizer and the main orientation direction of the stretched film does not need to be exactly 0 or 90 degrees
- the allowable width is ⁇ 6 degrees, which is more preferable.
- the allowable width is ⁇ 5 degrees
- the more preferable allowable range is ⁇ 4 degrees
- the particularly preferable allowable range is ⁇ 3 degrees
- the most preferable allowable range is ⁇ 2 degrees.
- the extinction axis of the polarizer of the polarizing plate may be parallel to the long side of the screen, perpendicular, or in a direction of 45 degrees. These directions are determined by the type and purpose of the image display cell, and are not particularly limited in the present invention. For example, in the case of an organic EL display cell, it is often arranged at 45 degrees.
- a retardation layer may be provided between the polarizer and the image display cell.
- the retardation layer may be a retardation film obtained by stretching a resin, or may be an alignment film of a liquid crystal compound in which a liquid crystal compound is applied and aligned.
- a circularly polarizing plate provided with a ⁇ wavelength layer as a retardation layer is used in order to suppress reflection of metal wiring of the cell.
- the retardation layer of the circularly polarizing plate is arranged on the organic EL cell side.
- the image display device of the present invention has a polarizing plate on the viewing side of the fingerprint authentication sensor, and has an alignment film on the viewing side of the polarizing plate.
- the alignment film is located on the surface of the image display device and prevents scratches on the image display surface, and prevents glass from scattering when glass members such as image display cells, touch sensors, and surface cover glass are broken by impact.
- Surface protective film a transparent conductive film which is also used as an electrode of a touch sensor, is used as a shatterproof film etc. which is located inside the display device and which prevents the shattering of the laminated glass on the glass member. It is a preferred form to be used as a surface protection film.
- the surface protective film be peeled and replaced when the film itself is damaged.
- the surface protective film is bonded to the image display device with an optical substrate-less pressure-sensitive adhesive sheet.
- any material such as polyester, polyamide, polypropylene, polycarbonate, polystyrene, acrylic resin, cyclic polyolefin, and cellulosic is used, but heat resistance, mechanical strength, dimensional stability, etc. From the characteristics, it is preferable to use polyester, especially polyethylene terephthalate.
- the oriented film is oriented by stretching, and has improved mechanical strength.
- the oriented film may be a uniaxially oriented film (uniaxially stretched film) or a biaxially oriented film (biaxially oriented film). From the viewpoint of excellent mechanical strength in all directions, a biaxially oriented film (biaxially stretched film) is preferable. On the other hand, a uniaxially stretched film is preferred from the viewpoint of excellent orientation uniformity.
- the film in order to increase the mechanical strength in the direction perpendicular to the main orientation direction, the film is also weakly stretched in the direction perpendicular to the main stretching direction (the film thus obtained is hereinafter referred to as weakly biaxially stretched).
- a film or a weakly biaxially oriented film) is also preferable.
- This weak stretching may be performed after the main stretching, but is preferably performed before or simultaneously with the main stretching. Needless to say, the film may be completely uniaxially stretched.
- the stretching is generally performed by a roll stretching using a continuous roll in a film flowing direction (longitudinal direction), and a stretching using a tenter for simultaneous stretching in a width direction (horizontal direction) and in a vertical and horizontal direction.
- the main orientation direction main stretching direction
- the main stretching direction may be the flow direction or the width direction.
- (elastic modulus in the direction orthogonal to the main orientation direction) / (elastic modulus in the main orientation direction) is 0.5 or less, or (breaking strength in the direction orthogonal to the main orientation direction) / ( A film having a breaking strength in the main orientation direction of 0.5 or less can be said to be a uniaxially oriented film or a weakly biaxially oriented film. Stretching may be performed at an appropriate temperature, magnification, and speed according to each material. Further, biaxial stretching and weak biaxial stretching can be adjusted mainly by respective stretching ratios.
- the refractive index of the slow axis is 1.68 or more, preferably 1.685 or more, and ⁇ Nxy is 0.095 or less, preferably 0.093 or less, it can be said that weak biaxial stretching is applied. .
- ⁇ Nxy is preferably less than 0.06, more preferably less than 0.055.
- ⁇ Nxy is preferably 0.01 or more, more preferably 0.015 or more, and particularly preferably 0.02 or more.
- ⁇ Nxy is preferably 0.065 or more, more preferably 0.070 or more, still more preferably 0.75 or more, particularly Preferably it is 0.80 or more, most preferably 0.85 or more.
- ⁇ Nxy is preferably 0.16 or less, more preferably 0.15 or less, particularly preferably 0.14 or less, and most preferably 0.13 or less. If the ratio exceeds the above range, it becomes too easy to be used, and the function when used as a surface protective film may not be maintained.
- the method for producing the oriented film is not particularly limited.
- a polyethylene terephthalate film is taken as an example of the oriented film, it can be produced by the following method.
- the stretching is performed by a continuous roll in the longitudinal direction (the flow direction of the film) as the first-stage stretching, and then is performed in the width direction (the direction orthogonal to the film-flow direction) as the second-stage stretching.
- both ends of the width of the film are gripped by clips and stretched in a tenter.
- the first-stage stretching and the second-stage stretching method may be reversed.
- the stretching ratio of the first stage is preferably 1.0 to 3.5 times, and particularly preferably 1.0 to 3.0 times.
- the stretching ratio of the second stage is preferably 2.5 to 6.0 times, particularly preferably 3.0 to 5.5 times. In the case of uniaxial stretching only, it is preferable to employ the second stage stretching ratio as the stretching ratio.
- the stretching temperature is preferably from 80 to 130 ° C, particularly preferably from 90 to 120 ° C.
- both ends of the width of the unstretched film may be gripped by clips, and may be biaxially stretched simultaneously in the longitudinal and width directions. Subsequently, it is preferable to perform a heat treatment at preferably 100 to 250 ° C, more preferably 180 to 245 ° C.
- the tenter stretching is performed in the width direction, the tenter may be stretched in an oblique direction with respect to the longitudinal direction.
- the extinction axis (absorption axis) of the polarizer and the main alignment direction (direction parallel to the main alignment axis) of the alignment film are preferably parallel or perpendicular.
- parallel or perpendicular means that the angle between the extinction axis of the polarizer and the main orientation direction of the alignment film does not need to be exactly 0 degrees or 90 degrees, and is 0 degrees ⁇ 6 degrees or less or 90 degrees.
- ⁇ 6 ° or less preferably 0 ° ⁇ 5 ° or less or 90 ° ⁇ 5 ° or less, more preferably 0 ° ⁇ 4 ° or less or 90 ° ⁇ 4 ° or less, 0 ° ⁇ 3 ° or less or 90 ° Particularly preferably ⁇ 3 degrees or less, particularly preferably 0 degrees ⁇ 2 degrees or 90 degrees ⁇ 2 degrees.
- the term “below” means that only the value following “ ⁇ ” is applied. Therefore, for example, “below 0 ° ⁇ 6 °” means that a range of 6 ° above and below 6 ° is allowed. Similarly, “90 ° ⁇ 6 ° or less” means that a range of 6 ° above and below 90 ° is allowed. When there are a plurality of oriented films, it is preferable that all the oriented films have the above relationship.
- the optical fingerprint sensor irradiates light from the bottom toward the display device surface and reads the fingerprint with the reflected light, but if there is a polarizer above the sensor (viewing side), the polarizer Linearly polarized light travels through an alignment film with a phase difference at an angle deviated from the optical axis, so that it becomes elliptically polarized light. Even when this is reflected and passes through a polarizer again, the effect of the alignment film with a phase difference also occurs.
- the main alignment direction is determined by measuring the slow axis and the fast axis with a molecular orientation meter (for example, MOA-6004 type molecular orientation meter manufactured by Oji Scientific Instruments), and the slow axis is defined as the main orientation axis.
- a molecular orientation meter for example, MOA-6004 type molecular orientation meter manufactured by Oji Scientific Instruments
- the fast axis is defined as the main orientation direction.
- the thickness of the oriented film can be appropriately set according to each purpose, but is preferably 5 to 200 ⁇ m. More preferably, it is 10 to 150 ⁇ m, particularly preferably 20 to 100 ⁇ m. If it is less than 5 ⁇ m, not only may it be too thin to handle poorly, but also when used as a surface protective film or the like, it may not be possible to secure sufficient mechanical strength for the purpose. If it exceeds 200 ⁇ m, not only the rigidity becomes too high, the handleability may deteriorate, but also the display device may not be suitable for thinning.
- the in-plane retardation of the oriented film is not particularly limited as long as it is at least such that a clear state can be observed as the orientation direction of the molecule, but it is preferably at least 1000 nm. ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
- smartphones and the like often operate outdoors with polarized sunglasses, and coloring and rainbow unevenness may occur when polarized sunglasses are worn when viewed from an oblique direction.
- the in-plane retardation of the alignment film is preferably 3000 nm or more. It is more preferably at least 4500 nm, particularly preferably at least 6000 nm.
- the in-plane retardation is preferably 30000 nm or less, more preferably 10000 nm or less, and still more preferably 9000 nm or less. Even if the in-plane retardation exceeds 30000 nm, a significant improvement in the rainbow unevenness improvement effect is unlikely to be expected, and furthermore, the thickness is required, and in order to reduce the thickness, it is necessary to significantly increase uniaxial orientation, and the Mechanical strength may decrease.
- the oriented film may be subjected to surface processing according to each purpose.
- a surface protective film a hard coat, an antireflection coat, a low reflection coat, an antistatic coat and the like can be used. Further, an easy adhesion coat may be provided.
- the visible side of the surface protection film is smooth enough to recognize the fingerprint.
- the surface roughness SRa of the surface on the viewing side is preferably 100 nm or less, more preferably 50 nm or less, and particularly preferably 30 nm or less.
- the total light transmittance of the oriented film is preferably 80% or more, more preferably 85% or more, and particularly preferably 88% or more. Further, the haze of the oriented film is preferably 3% or less, more preferably 2.5% or less, and particularly preferably 2% or less.
- ⁇ Nxy
- the biaxial refractive index anisotropy ( ⁇ Nxy) was determined by the following method.
- the slow axis direction of the film was determined using a molecular orientation meter (MOA-6004 type molecular orientation meter manufactured by Oji Scientific Instruments), and 4 cm was set so that the slow axis direction was parallel to the long side of the sample for measurement.
- MOA-6004 type molecular orientation meter manufactured by Oji Scientific Instruments
- a rectangle of 2 cm was cut out and used as a measurement sample.
- a biaxial refractive index perpendicular to the optical axis (refractive index in the slow axis direction: nx, a refractive index in a direction orthogonal to the slow axis direction in the plane (that is, a refractive index in the fast axis direction): ny),
- the refractive index in the thickness direction (nz) is determined by an Abbe refractometer (NAR-4T, manufactured by Atago, measurement wavelength: 589 nm), and the absolute value (
- Rate anisotropy ( ⁇ Nxy).
- the thickness d (nm) of the film was measured using an electric micrometer (Millitron 1245D, manufactured by Fineleuf Co.), and the unit was converted to nm.
- the retardation (Re) was determined from the product ( ⁇ Nxy ⁇ d) of the anisotropy of the refractive index ( ⁇ Nxy) and the thickness d (nm) of the film.
- Three-dimensional center plane average surface roughness (SRa): A film having an area of 50 mm ⁇ 50 mm is cut out, and a three-dimensional surface shape measuring device (manufactured by Ryoka Systems Inc., Micromap 550N (measurement conditions: wave mode, measurement wavelength 560 nm, objective lens 10 ⁇ )) is applied to the film surface. On the other hand, the measurement was performed in the vertical direction, a 400 ⁇ m ⁇ 400 ⁇ m CCD camera image capturing area was designated, and SRa given by the following equation was determined. On both sides of the film, the number of measurements was set to 16, and the average value was determined. In addition, fractions after the decimal point are rounded off.
- S M Lx ⁇ Ly, Lx, Ly is the range in the x, y directions, and f (x, y) is the height of the measurement point (x, y) from the average plane.
- Oriented film A A 75 ⁇ m thick film of Cosmoshine (registered trademark) A4300 manufactured by Toyobo Co., Ltd. was used. Since the main orientation direction differs depending on the slit position of the film roll, a portion where the main orientation direction is 90 ° ⁇ 6 ° or less with respect to the length direction of the film roll was cut out and used.
- a coating agent for an easy-adhesion layer comprising a water-dispersible polyester resin and an aqueous dispersion of a blocked isocyanate-modified polyurethane was applied, and then led to a tenter-type simultaneous biaxial stretching machine to form a film.
- a hot air zone at a temperature of 125 ° C., and stretched 1.8 times in the longitudinal direction and 4 times in the width direction.
- the treatment was performed at a temperature of 225 ° C. for 10 seconds, and a 2.5% relaxation treatment was performed vertically and horizontally. Since the produced film roll showed some distortion of the orientation due to bowing at the end position, a portion where the main orientation direction was 90 ° ⁇ 6 ° or less with respect to the length direction of the film roll was cut out and used.
- Oriented film C A 80 ⁇ m thick film of Cosmoshine (registered trademark) super birefringence type (SRF) manufactured by Toyobo Co., Ltd. was used. Since the main orientation direction was almost stable in the width direction of the film roll, it was arbitrarily selected, and it was confirmed that the main orientation direction was 90 ° ⁇ 6 ° or less with respect to the length direction of the film roll.
- SRF Cosmoshine
- a UV-curable hard coat agent is applied to the easy-adhesion coated surfaces of the alignment films A, B, and C, dried, and then irradiated with ultraviolet light from a high-pressure mercury lamp to form the alignment films A, B, and C having a hard coat layer on one surface. C was obtained. Further, a commercially available optical pressure-sensitive adhesive (substrate-less type) was peeled off the light release sheet and laminated on a roll-to-roll basis on the surface of each oriented film opposite to the surface on which the hard coat layer was laminated. Table 2 shows the measurement results of the three-dimensional center plane average surface roughness SRa on the hard coat layer side for each oriented film.
- Example 16 Simulating the case where a transparent conductive film of a polyester film is used as a touch sensor, oriented films A and C each having a hard coat layer and an adhesive layer laminated thereon were laminated and bonded in the same manner as described above.
- positive values indicate the clockwise direction of the main alignment axis with respect to the light transmission axis of the polarizer as viewed from the viewing side, and negative values indicate the counterclockwise direction.
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Abstract
Description
このようなモバイル端末は、モバイルという大きさの制約の中、大画面化とするため、本体全体を表示画面とし、画面内(視認側から見て画像表示領域であってその奥)に認証システムのセンサーを組み込むことが提案されている。特に有機エレクトロルミネッセンス(有機EL)画像表示装置では、画像表示セルのピクセルの隙間を通して指紋認証のセンサーを作動させることができ、このような方式が広がってきている。
項1.
指紋認証センサーの視認側に偏光板を有し、前記偏光板の視認側に配向フィルムを有する画像表示装置であって、
前記配向フィルムの主配向方向と前記偏光板の偏光子の消光軸方向がなす角度が0度±6度以下、または90度±6度以下である画像表示装置。
(なお、上記において、「以下」は「±」の次の数値にのみかかるものとする。)
本発明は、指紋認証センサーの視認側に偏光板、さらにその視認側に配向フィルムを有する画像表示装置である。指紋認証センサー(指紋認証センサー部)は表示画面の外に設置されていても、表示画面の内(視認側から見て画像表示領域であってその奥)に設置されていても良い。例えば、ここで言う表示画面の外とは図1の状態であり、表示画面の内(視認側から見て画像表示領域であってその奥)とは図2の状態である。表示画面の内に設置されるタイプは画面埋め込み型とも言われており、例えば、図3のように指紋認証センサー本外は視認側から見て画面の奥に設置されている。図3において、指紋認証センサー本体の視認側に、画像表示セル(例えば、有機ELセル)が配置されている。画像表示セルの視認側には、偏光板(画像表示セルが有機ELセルの場合には、円偏光板が好ましい)が配置されている。偏光板より視認側には、粘着剤層を介して配向フィルムが配置されている。
本発明の画像表示装置に用いられる画像表示セルは、特に制限はないが、小型、薄型化できるという点で、液晶表示セルや有機EL(OLED)セルが好ましい例として挙げられる。なかでも、有機ELセルは、セルのピクセルの隙間を通して指紋認証のセンサーを作動させることができ、好ましい例である。
指紋認証センサーは光学式、超音波式、静電容量式、電界強度測定式、感圧式、感熱式などが挙げられ、特に制限はないが、本発明の画像表示装置の構成との相性から光学式か超音波式が好ましく、特には光学式が好ましい。
光学式の指紋認証センサーとしては、例えば、Synaptics社から商品名「Clear ID」として市販されている。
超音波式の指紋承認センサーとしては、例えば、Qualcomm Technologies社から商品名「Qualcomm Fingerprint Sensors」として市販されている。
上記の通り、画像表示装置は、指紋認証センサーの視認側に偏光板が設けられた状態である。偏光板は、偏光を生じさせる機能を有する偏光子と偏光子を保護するための偏光子保護フィルムを含むものであることが一般的であるが、偏光子の片面にのみ偏光子保護フィルムが積層されたものであっても良く、偏光子のみのものであっても良い。偏光子としては、一軸に配向したポリビニルアルコールにヨウ素や有機系の二色性色素などが吸着されている薄膜、液晶化合物と有機系二色性色素からなる配向膜などが挙げられるが、特に制限なく用いることができる。
有機ELセルの場合は、セルの金属配線の反射などを抑制するため、位相差層として1/4波長層を設けた円偏光板が用いられる。円偏光板の位相差層を有機ELセル側にして配置される。
本発明の画像表示装置では、指紋認証センサーの視認側に偏光板を有し、前記偏光板より視認側に配向フィルムを有する。配向フィルムは、画像表示装置の表面に位置し、画像表示面の傷付を防いだり、衝撃を受けて画像表示セルやタッチセンサー、表面カバーガラスなどのガラス部材が割れた時にガラスの飛散を防止するための表面保護フィルム、タッチセンサーの電極としても用いられる透明導電フィルム、表示装置内部に位置してガラス部材に貼り合わせガラスの飛散を防止する飛散防止フィルム等として用いられれるが、本発明では、表面保護フィルムとして用いられることが好ましい形態である。
なお、表面保護フィルムは、フィルム自体が傷付いた場合には剥がし、貼り替えるものであることが好ましい。表面保護フィルムは、光学用の基材レス粘着剤シートで画像表示装置に貼り合わされていることが好ましい。
なお、延伸は、一般的には、フィルムの流れ方向(縦方向)には連続するロールを用いたロール延伸が用いられ、幅方向(横方向)や縦横の同時延伸にはテンターを用いた延伸が用いられる。
本発明において、主配向方向(主延伸方向)は、流れ方向であっても幅方向であっても良い。
延伸は、それぞれの素材に合わせて適正な温度、倍率、速度で行えばよい。また、二軸延伸と弱二軸延伸は、主にそれぞれの延伸倍率で調整することができる。
また、ポリエチレンテレフタレートフィルムであれば、主配向方向の屈折率とそれに直交する方向の屈折率の差(ΔNxy)が0.055以上、好ましくは0.06以上であれば弱二軸延伸フィルムと言える。また、遅相軸の屈折率が1.68以上、好ましくは1.685以上であり、かつΔNxyが0.095以下、好ましくは0.093以下であれば弱い二軸延伸がかかっていると言える。
なお、上述のように各方向からの機械的強度の確保のためには、二軸配向フィルム(二軸延伸フィルム)が好ましく、ΔNxyは0.06未満が好ましく、さらに好ましくは0.055未満であるが、均質・均等な二軸配向は困難であるだけでなく、わずかの製造条件のぶれ等で同一生産のフィルムの中で配向方向が変化し易くなる。製造上、フィルムの広い面積で均一な配向方向であるためには、ΔNxyは0.01以上が好ましく、より好ましくは0.015以上、特に好ましくは0.02以上である。
一般的には、延伸は、第一段目の延伸として縦方向(フィルムの流れ方向)に連続ロールで行い、その後、第二段目の延伸として幅方向(フィルムの流れ方向とは直交する方向)の延伸では、フィルムの幅両端をクリップで把持しテンター内で延伸する。なお、第一段目の延伸と第2段目の延伸方法が逆であっても良い。第一段目の延伸倍率は1.0~3.5倍が好ましく、特に好ましくは1.0倍~3.0倍である。また、第二段目の延伸倍率は2.5~6.0倍が好ましく、特に好ましくは3.0~5.5倍である。なお、一軸延伸のみの場合、延伸倍率は第二段目の延伸倍率を採用することが好ましい。いずれの延伸においても、延伸温度は80~130℃が好ましく、特に好ましくは90~120℃である。また、未延伸フィルムの幅両端をクリップで把持し、縦方向、幅方向に同時に二軸延伸しても良い。引き続き、好ましくは100~250℃、より好ましくは180~245℃で、熱処理することが好ましい。また、上記のテンター延伸は幅方向であったが、縦方向に対して斜め方向に延伸を行ってもよい。
本発明において、偏光子の消光軸(吸収軸)と配向フィルムの主配向方向(主配向軸と平行の方向)とは、平行又は垂直であることが好ましい。ここで、平行又は垂直とは、偏光子の消光軸と配向フィルムの主配向方向とのなす角度が、厳密に0度、または90度である必要はなく、0度±6度以下又は90度±6度以下が好ましく、0度±5度以下又は90度±5度以下がより好ましく、0度±4度以下又は90度±4度以下がさらに好ましく、0度±3度以下又は90度±3度以下が特に好ましく、0度±2度以下又は90度±2度以下が特に好ましい。なお、「以下」という用語は、「±」の次の数値のみにかかることを意味する。従って、例えば、前記「0度±6度以下」とは、0度を中心に上下6度の範囲の変動を許容することを意味する。また、同様に、「90度±6度以下」とは、90度を中心に上下6度の範囲の変動を許容することを意味する。
配向フィルムが複数存在する場合はすべての配向フィルムが上記関係になっていることが好ましい。
なお、主配向方向は、分子配向計(例えば、王子計測機器株式会社製、MOA-6004型分子配向計)で遅相軸、進相軸を測定し、遅相軸を主配向軸とする。なお、スチレン系樹脂など、光弾性係数が負であるものは進相軸を主配向方向とする。
配向フィルムは、それぞれの目的に合わせて表面加工がされていても良い。例えば、表面保護フィルムであれば、ハードコート、反射防止コート、低反射コート、帯電防止コートなどである。また、易接着コートを設けても良い。
JIS C-2318に準じて測定した。
JIS C-2318に準じて測定した。
リタデーションとは、フィルム上の直交する二軸の屈折率の異方性(△Nxy=|nx-ny|)とフィルム厚みd(nm)との積(△Nxy×d)で定義されるパラメーターであり、光学的等方性、異方性を示す尺度である。二軸の屈折率の異方性(△Nxy)は、以下の方法により求めた。分子配向計(王子計測機器株式会社製、MOA-6004型分子配向計)を用いて、フィルムの遅相軸方向を求め、遅相軸方向が測定用サンプル長辺と平行になるように、4cm×2cmの長方形を切り出し、測定用サンプルとした。このサンプルについて、直交する二軸の屈折率(遅相軸方向の屈折率:nx,面内で遅相軸方向と直交する方向の屈折率(即ち進相軸方向の屈折率):ny)、及び厚さ方向の屈折率(nz)をアッベ屈折率計(アタゴ社製、NAR-4T、測定波長589nm)によって求め、前記二軸の屈折率差の絶対値(|nx-ny|)を屈折率の異方性(△Nxy)とした。フィルムの厚みd(nm)は電気マイクロメータ(ファインリューフ社製、ミリトロン1245D)を用いて測定し、単位をnmに換算した。屈折率の異方性(△Nxy)とフィルムの厚みd(nm)の積(△Nxy×d)より、リタデーション(Re)を求めた。
表面保護フィルム等をはがして直線偏光が出光されるようにした画像表示装置を点灯させ、その上に消光軸が既知である偏光フィルタを載せて最も暗くなる状態の偏光フィルターの消光軸の方向を求め、これと90度の方向を消光軸方向とした。
分子配向計(王子計測機器株式会社製、MOA-6004型分子配向計)で測定した。
JIS K-7105に準じて測定した。
JIS K-7105に準じて測定した。
50mm×50mmの面積のフィルムを切り出し、3次元表面形状測定装置(菱化システム社製、マイクロマップ550N(測定条件:waveモード、測定波長560nm、対物レンズ10倍))を用いて、フィルム面に対して垂直方向から測定し、400μm×400μmのCCDカメラ画像取り込み領域を指定し、次式により与えられるSRaを求めた。フィルム両面において、測定数をそれぞれ16とし、それらの平均値を求めた。また、小数点以下の端数は、四捨五入によりまるめた。
指紋認証による10回の起動を試み、起動できた回数で表した。なお、指先は濡れたタオルで汚れを拭き取った後、乾いたタオルで水分を除き、約3秒後にセンサー部に指先を載せて行った。
光学用粘着剤を用いて、市販のスマートフォン用表面保護ガラスに、配向フィルムを貼り付け、テストサンプルを作成した。サンプルの各辺部分に厚さ5mmのスペーサーを介してサンプルを台の上に置き(フィルム面は上)、上から鋼球を落下させた。5枚のサンプルでテストした。なお、ガラスが割れなかった場合は再度綱球を落下させた。
○:ガラスは割れたがフィルムが裂けるサンプルはなかった。
△:鋼球の衝突部分にわずかなフィルムの裂けが認められるサンプルがあった。
×:フィルムが大きく裂けるサンプルがあった。
指紋認証テスト用の画像表示装置を、偏光サングラスをかけた状態で斜め方向から観察した。
○:虹むらは認められなかった
△:弱い虹むらが認められた
×:明らかな虹むらが認められた。
下記の配向フィルムA、B、Cを準備した。それぞれの特性は表1に示す。
東洋紡株式会社製コスモシャイン(登録商標)A4300のフィルム厚み75μmのフィルムを用いた。なお、主配向方向はフィルムロールのスリット位置で異なるため、主配向方向がフィルムロールの長さ方向に対して90度±6度以下である部分を切り出して使用した。
平均粒径0.9μmの多孔質シリカを0.7質量%含むポリエチレンテレフタレートチップ(固有粘度 0.60dl/g(フェノール:1,1,2,2-テトラクロルエタン=6:4混合溶媒で溶解し30℃で測定)、以後、PETと略す。)を乾燥後、溶融押出機により280℃で溶融して冷却ロール上にシート状に押し出し、未延伸ポリエチレンテレフタレートシートを得た。次いで、この未延伸シートの片面に、水分散性ポリエステル樹脂とブロックイソシアネート変性ポリウレタン水分散体からなる易接着層用コート剤を塗布し、引き続き、テンター型の同時二軸延伸機に導き、フィルムの端部をクリップで把持しながら、温度125℃の熱風ゾーンに導き、縦方向に1.8倍、幅方向に4倍に延伸した。状態を保ったまま、温度225℃、10秒間で処理し、さらに縦、横それぞれで2.5%の緩和処理を行った。生産したフィルムロールは端部位置でボーイングによる配向の歪みがやや見られたため、主配向方向がフィルムロールの長さ方向に対して90度±6度以下である部分を切り出して使用した。
東洋紡株式会社製コスモシャイン(登録商標)超複屈折タイプ(SRF)の厚み80μmのフィルムを用いた。なお、主配向方向はフィルムロールの幅方向でほぼ安定しているため、任意に選び、主配向方向がフィルムロールの長さ方向に対して90度±6度以下であることを確認した。
配向フィルムA、B、Cの易接着コート面に、UV硬化型のハードコート剤を塗工、乾燥後、高圧水銀灯で紫外線を照射して、片面にハードコート層を有する配向フィルムA,B,Cを得た。さらに各配向フィルムの、ハードコート層を積層した面とは反対面に、市販の光学粘着剤(基材レスタイプ)を、軽剥離シートを剥がしてロールツーロールで積層した。各配向フィルムについて、ハードコート層側の三次元中心面平均表面粗さSRaの測定結果を表2に示す。
実施例1~15、比較例1、2
上記のハードコート層及び粘着剤層が積層された配向フィルムを、光学的指紋認証センサーを表示画面に組み込んだ有機EL表示装置VIVO社製X20 Plus UDの画面全体の大きさにカットした。これを表面保護フィルムとして、粘着剤面を介して、前記有機EL表示装置の画面上に貼り付けた。なお、購入時に貼り付けられていた表面保護フィルムは剥がした。貼り合わせる時の角度及びその評価結果を表3~5に示した。角度はカットした各ハードコート層及び粘着剤層が積層された配向フィルムで確認して貼り合わせた。
タッチセンサーとしてポリエステルフィルムの透明導電性フィルムが用いられる場合を模して、ハードコート層及び粘着剤層を積層した配向フィルムA及びCを積層して上記と同様に貼り合わせた。
2 画像表示部
3 指紋認証センサー部
21 画像表示セル
22 偏光板
23 粘着剤層
24 配向フィルム(表面保護フィルム)
31 指紋認証センサー本体
Claims (1)
- 指紋認証センサーの視認側に偏光板を有し、前記偏光板の視認側に配向フィルムを有する画像表示装置であって、
前記配向フィルムの主配向方向と前記偏光板の偏光子の消光軸方向がなす角度が0度±6度以下、または90度±6度以下である画像表示装置。
(なお、上記において、「以下」は「±」の次の数値にのみかかるものとする。)
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Also Published As
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KR102532989B1 (ko) | 2023-05-16 |
JP6863530B2 (ja) | 2021-04-21 |
JP2021101250A (ja) | 2021-07-08 |
TW202018343A (zh) | 2020-05-16 |
KR102344400B1 (ko) | 2021-12-28 |
CN115394189B (zh) | 2024-06-21 |
JP7405107B2 (ja) | 2023-12-26 |
CN115394189A (zh) | 2022-11-25 |
KR20210046071A (ko) | 2021-04-27 |
CN112740304A (zh) | 2021-04-30 |
JPWO2020067243A1 (ja) | 2021-02-15 |
KR20220002705A (ko) | 2022-01-06 |
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