KR20200024062A - Optical sensor module including means for improving fingerprint recognition rate of optical fingerprint sensor - Google Patents

Abstract

The present invention relates to an optical sensor module (000). According to the present invention, the optical sensor module (000) comprises: a self-luminous panel (100) emitting light; a polarizing plate (200) disposed on one surface of the self-luminous panel (100); a window (300) disposed on one surface of the polarizing plate (200); a window protection film (400) disposed on at least one surface of the window (300); and a fingerprint sensor unit (500) disposed on the other surface of the self-luminous panel (100) opposite to the surface, on which the polarizing plate (200) is disposed, and sensing the light emitted from the self-luminous panel (100) and reflected from a user′s fingerprint, wherein a) a mutual angle (θ;) between an absorption axis (201) of the polarizing plate (200) and a slow axis (401) of the window protection film (400) is adjusted to be -15° to 15° or 75° to 105°so that a specular reflectance can be increased, thereby increasing a fingerprint recognition rate of the fingerprint sensor or b) the specular reflectance is maintained at a constant level regardless of the mutual angle between the absorption axis (201) of the polarizing plate (200) and the slow axis (401) of the window protection film (400) by including a λ/4 phase difference (600) layer between the polarizing plate (200) and the window protection film (400). Therefore, when used together with an additional means for increasing the amount of light irradiation of the included self-luminous panel and the like, the fingerprint sensor can be improved in the fingerprint recognition rate without separate adjustment of the mutual angle.

Description

OPTICAL SENSOR MODULE INCLUDING MEANS FOR IMPROVING FINGERPRINT RECOGNITION RATE OF OPTICAL FINGERPRINT SENSOR}

The present invention relates to an optical sensor module comprising means for improving the fingerprint recognition rate of the optical fingerprint sensor.

Recently, various sensors have been implemented in an electronic device or system to provide a desired function. In this process, there is a growing need to secure access by means of distinguishing only authorized users and distinguishing unauthorized users.

For example, mobile phones, digital cameras, tablet PCs, notebook computers, and other portable electronic devices are becoming increasingly popular for personal, commercial, and government purposes. There is an increasing need for mounting one or more security mechanisms that enable electronic devices such as personal computers to be accessed only by authorized personnel to use or protect information in an organization or enterprise device or system.

In the case of secure access to a portable electronic device, such as a mobile device, various methods may be used, such as using a user password as a security mechanism. However, passwords can be easily spread or obtained, and the nature of these passwords can compromise security, and users must remember passwords to use password-protected electronics or systems, and if they forget the password, the user must There is the inconvenience of having to authenticate or otherwise regain access to the device by performing a password recovery procedure. In various situations, this password recovery process can be burdensome for the user and presents various practical limitations and inconveniences.

Recently, a fingerprint sensor has been developed and used to minimize the inconvenience of the user. Such a fingerprint sensor is classified into a capacitive type and an optical type. The capacitive fingerprint sensor detects the static electricity by the fingerprint of the human body using a semiconductor device sensitive to voltage and current, while the fingerprint sensor is configured to include a light source and an optical sensor. The user's fingerprint is recognized by detecting light emitted from the light source. Optical fingerprint sensor is more durable than capacitive type, so the demand of optical fingerprint sensor is increasing.

In this regard, Korean Patent Laid-Open Publication No. 10-2017-0106425 discloses an electronic device capable of detecting a fingerprint by light sensing, which is operable to provide a touch sensing operation and to emit light forming a part of a display image. A device screen comprising a display panel structure having a light emitting display pixel; An upper transparent layer formed on the device screen as an interface for being touched by the user for the touch sensing operation and transmitting an light from the display panel structure to display an image to the user; And an optical sensor module positioned below the display panel structure to receive light emitted by at least some of the light emitting display pixels of the display panel structure and returning from the upper transparent layer to detect a fingerprint. However, this is a problem that the fingerprint recognition rate is lowered if the user is added to the window protection film to attach additional for the purpose of protecting the window.

Republic of Korea Patent Publication No. 10-2017-0106425 (2017.09.20.)

An object of the present invention is to provide an optical sensor module including a means for improving the fingerprint recognition rate, to solve the above problems.

The optical sensor module of the present invention for achieving the above object is a light emitting panel for irradiating light; A polarizer disposed on one surface of the self-luminous panel; A window positioned on one surface of the polarizer; A window protective film on at least one surface of the window; A fingerprint sensor unit positioned on the other surface of the surface of the polarizing plate of the self-luminous panel and sensing light reflected from the fingerprint of the user by being irradiated from the self-luminous panel; And a) the mutual angle between the absorption axis of the polarizing plate and the slow axis of the window protection film is -15 ° to 15 ° or 75 ° to 105 °, or b) a λ / 4 phase difference between the polarizing plate and the window protection film. Characterized in that it comprises a fingerprint recognition rate improvement means that the layer is further included.

In addition, the image display apparatus according to the present invention is characterized by including the above-described optical sensor module.

 Optical sensor module including a fingerprint sensor recognition rate improving means of the present invention has the advantage that the fingerprint recognition rate is improved.

The image display device of the present invention has the same advantages as above by including the above-described optical sensor module.

1 is a view schematically showing the structure of an optical sensor module of the present invention.
Figure 2 is a simplified view showing the mutual angle between the absorption axis of the polarizing plate and the slow axis of the window protective film in the present invention.
3 is a diagram showing a change in specular reflectance according to mutual angles.
4 is a view showing a change in the specular reflectance according to the mutual angle for the optical sensor module further comprising a λ / 4 phase difference layer in the present invention.
5 is a view schematically showing the structure of the self-luminous panel of the present invention.

In the present invention, when a member is located "on" another member, this includes not only when a member is directly in contact with another member, but also when another member is interposed between two members.

In the present invention, when a part is said to "include" a certain component, it means that it may further include other components, except for the other components unless otherwise stated.

Hereinafter, the present invention will be described in more detail.

1 and 2, an optical sensor module according to an aspect of the present invention includes a self-luminous panel 100 for irradiating light; A polarizer 200 positioned on one surface of the self-luminous panel 100; A window 300 disposed on one surface of the polarizer 200; A window protection film 400 positioned on at least one surface of the window 300; A fingerprint sensor unit 500 positioned on the other surface of the surface of the polarizing plate 200 of the self-luminous panel 100 and sensing light reflected from the fingerprint of the user by being emitted from the self-luminous panel 100; And a) the mutual angle θ between the absorption axis 201 of the polarizing plate 200 and the slow axis 401 of the window protective film 400 is -15 ° to 15 ° or 75 ° to 105 °, or b) emitting from the self-luminous panel 100 by including a fingerprint recognition rate improving means further comprising a λ / 4 retardation layer 600 between the polarizer 200 and the window protective film 400. Fingerprint recognition rate is improved by improving the specular reflectance when the reflected light is reflected by the fingerprint.

2 and 3, the mutual angle θ between the absorption axis 201 of the polarizing plate 200 and the slow axis 401 of the window protective film 400 is measured as in the a) means. By adjusting it to -15 ° to 15 ° or 75 ° to 105 °, the specular reflectance when light emitted from the self-luminous panel 100 is reflected by the fingerprint is maintained at 33% or more to reach the fingerprint sensor 500. This facilitates the fingerprint recognition rate.

1 and 4, when λ / 4 retardation layer 600 is further included between the polarizing plate 200 and the window protective film 400 as in the means b), when reflected by the fingerprint. The constant reflectivity of the polarizing plate 200 and the window protective film 400, regardless of the mutual angle can be maintained at a constant level, for example, 23 to 27% level, in this case self-luminescence included together as an example The fingerprint recognition rate may be improved by improving the overall specular reflectance regardless of the mutual angle through an additional method such as increasing the amount of light of the panel 100.

<Optical Sensor Module (000)>

Optical sensor module (000) according to an aspect of the present invention has the advantage that the fingerprint recognition rate is improved by including a fingerprint sensor recognition rate improvement means as described above.

The structure of the optical sensor module 000 of the present invention is, for example, referring to FIG. 1, for example, the fingerprint sensor 500, the self-light emitting panel 100, the polarizer 200, and the window 300 sequentially from the lower surface thereof. The window protection film 400 may be disposed, but the present invention is not limited thereto, and the window protection film 400 may be included between the polarizer 200 and the window 300 as necessary. In addition, according to the needs of the developer, other configurations may be further included without compromising the purpose as the optical sensor module 000 other than the above-described configurations.

Self-luminescence  Panel (100)

The optical sensor module 000 according to one aspect of the present invention includes a self-luminous panel 100.

Referring to FIG. 5, the self-luminous panel 100 includes a pixel electrode 102, a pixel defining layer 103, a display layer 104, an opposite electrode 105, and an encapsulation disposed on the panel substrate 101. It may include a migration layer 106.

The panel substrate 101 may include a soluble resin material such as glass or polyimide. A pixel circuit including a thin film transistor may be formed on the panel substrate 101, and an insulating layer covering the pixel circuit may be formed. The pixel electrode 102 may be electrically connected to the drain electrode of the TFT, for example.

The pixel defining layer 103 may be formed on the insulating layer to expose the pixel electrode 102 to define a pixel region. The display layer 104 is formed on the pixel electrode 102, and the display layer 104 may include, for example, an organic emission layer.

An opposite electrode 105 may be disposed on the pixel defining layer 103 and the display layer 104. The counter electrode 105 may be provided as, for example, a common electrode or a cathode of an image display device. An encapsulation layer 106 may be stacked on the counter electrode 105 to protect the display panel.

Polarizer 200

The optical sensor module 000 according to one aspect of the present invention includes a polarizer 200.

The polarizer 200 may include a substrate, a polarizer layer, a circular polarization retardation layer, and an adhesive layer.

The substrate may serve as a support for supporting and protecting the polarizer layer, for example, polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), Polyethylene naphthalate (PEN), polyethylene terephthalate (polyethyeleneterepthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC) ), Cellulose triacetate (TAC), cellulose acetate propionate (CAP), and the like, and it may be preferable to include cellulose triacetate in terms of improving durability.

The polarizer layer is a device for changing the natural light into linearly polarized light, and usually a step of uniaxially stretching a polyvinyl alcohol-based resin film or a step of adsorbing the dichroic dye by dyeing the polyvinyl alcohol-based resin film with a dichroic dye. , A process of treating a polyvinyl alcohol-based resin film adsorbed with a dichroic dye with an aqueous solution of boric acid, and a process of washing with water after treatment with an aqueous solution of boric acid, or by applying a dye having absorption anisotropy, at least It may be used by bonding a transparent protective film through an adhesive layer on one surface, but is not limited thereto.

Specific examples of the circularly polarized retardation layer include a λ / 4 retardation layer and a λ / 2 retardation layer.

The λ / 4 retardation layer may be an optically anisotropic support having a desired λ / 4 function as the support itself, or may be in a form in which another optically anisotropic layer is laminated on a support made of a polymer film. Although it does not specifically limit about the constituent material of the said optically anisotropic layer, It is a layer formed from the composition containing a liquid crystalline compound, and may be a layer which shows the optical anisotropy expressed by the orientation of the molecule | numerator of this liquid crystalline compound, and a polymer It may be a layer having optical anisotropy which is obtained by stretching a film to orientate and expressing a polymer in the film, or may have both layers. That is, it may be constituted by one or two or more biaxial films, and may also be configured by combining two or more monoaxial films, and, of course, combining one or more biaxial films and one or more monoaxial films. It can also be configured.

Here, the λ / 4 retardation layer means an optically anisotropic layer in which the in-plane retardation Re (λ) at a specific wavelength λnm satisfies [Re (λ) = λ / 4]. The above formula may be achieved at any wavelength in the visible region (for example, 550 nm).

In the present invention, Re (λ) means in-plane retardation at wavelength λ. The said Re ((lambda)) is measured by making light of wavelength (lambda) nm inject in the film normal line direction in KOBRA 21ADH or WR (Oji Measurement Instruments Co., Ltd. product). In the selection of the measurement wavelength?

The λ / 2 retardation layer may be an optically anisotropic support having a desired λ / 4 function as the support itself, or may be in a form in which another optically anisotropic layer is laminated on a support made of a polymer film. Although it does not specifically limit about the constituent material of the said optically anisotropic layer, It is a layer formed from the composition containing a liquid crystalline compound, and may be a layer which shows the optical anisotropy expressed by the orientation of the molecule | numerator of this liquid crystalline compound, and a polymer It may be a layer having optical anisotropy which is obtained by stretching a film and orienting and expressing a polymer in the film, or may have both layers. That is, it may be constituted by one or two or more biaxial films, and may also be configured by combining two or more monoaxial films, and, of course, combining one or more biaxial films and one or more monoaxial films. It can also be configured.

The λ / 2 retardation layer means an optically anisotropic layer in which the in-plane retardation Re (λ) at a specific wavelength λnm satisfies [Re (λ) = λ / 2]. The above formula may be achieved at any wavelength (for example, 550 nm) in the visible range.

The pressure-sensitive adhesive layer may be used for adhesion between the respective constituent layers of the polarizing plate 200 described above. At this time, the component of the pressure-sensitive adhesive layer is not limited to the pressure-sensitive adhesive, an adhesive may also be used.

For example, the pressure-sensitive adhesive is obtained by radical polymerization of an acrylic monomer mixture containing (meth) acrylic acid ester as a main component and a (meth) acryl monomer having a functional group in the presence of a polymerization initiator, and a glass transition temperature (Tg) is obtained. An acrylic adhesive containing an acrylic resin and a crosslinking agent which is 0 degrees C or less can be used.

Examples of the adhesive include a water-based adhesive obtained by dissolving or dispersing an adhesive component in water, and a composition (hereinafter, referred to as an active energy ray-curable adhesive) for curing by receiving active energy ray irradiation.

The aqueous adhesive may include a polyvinyl alcohol-based resin or a urethane resin as a main component, and may include a composition containing a crosslinking agent or a curable compound such as an isocyanate compound or an epoxy compound in order to improve adhesiveness.

The pressure-sensitive adhesive layer is not limited to the above contents, and may be in the form of a film including an adhesive or an adhesive. In addition, it may be specifically, a pressure sensitivity adhesive (PSA) layer that performs an adhesive operation in response to an externally provided pressure, but is not limited thereto.

window (300)

The optical sensor module 000 according to one aspect of the present invention includes a window 300.

The window 300 may be generally located on the surface of the optical sensor module 000, but may be further included anywhere between the layers constituting the optical sensor module 000 as necessary.

The window 300 may be, for example, applied to an LCD device, an OLED device, a touch screen panel (TSP), and the like, and may include a material having durability against external impact and transparency that a user can see. The window 300 is, for example, glass, polyimide (PI), polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene na Phthalate (polyethyelenen napthalate (PEN), polyethylene terephthalate (PET, polyethyelene terepthalate), polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC, polycarbonate), cellulose triacetate (TAC) , Cellulose acetate propionate (CAP), and the like, but are not limited thereto. These may be used alone or in combination of two or more thereof.

Among these, glass can be used preferably.

The window 300 may include, for example, a hard coating film, and a light shielding pattern may be formed on a peripheral portion of one surface of the window substrate. For example, the light blocking pattern may include a color printing pattern, and may have a single layer or a multilayer structure. The bezel portion or the non-display area of the image display apparatus including the light blocking pattern may be defined.

window  Protective film (400)

The optical sensor module (000) of the present invention includes a window protection film (400).

The window protective film 400 may be disposed as needed anywhere in the upper / lower portion of the above-described window 300, may be arranged from the time of manufacturing the optical sensor module (000) according to the needs of the manufacturer, the user Depending on the needs of the window 300 may be further laminated to the surface portion.

In detail, the window protection film 400 may be stacked on the upper part of the window 300, that is, the outermost part of the image display device, according to a user's need. In this case, the window protection film 400 may be protected from an external impact. Can play a role.

In addition, the window protection film 400 may be laminated on the lower portion of the window 300, that is, between the polarizing plate 200 and the window 300, according to a designer's need. Even if using a tool such as the protective film 400 has the advantage that the screen can be properly seen by solving the polarization of the sunglasses.

In this case, the window protective film 400 may be selected in consideration of transparency, mechanical strength, thermal stability, moisture shielding, isotropy, etc., for example, polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, polybutylene Polyester-based resins such as terephthalate; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resins; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymers; Polyolefin resins such as polyethylene, polypropylene, cycloolefin or polyolefin having a norbornene structure, and ethylene-propylene copolymers; Vinyl chloride-based resins; Amide resins such as nylon and aromatic polyamides; Imide resin; Polyether sulfone resin; Sulfone resins; Polyether ether ketone resins; Sulfided polyphenylene resins; Vinyl alcohol-based resins; Vinylidene chloride-based resins; Vinyl butyral resin; Allyl resins; Polyoxymethylene resin; A film composed of a thermoplastic resin such as an epoxy resin may be used, and a film composed of a blend of the thermoplastic resins may also be used. Moreover, the film of thermosetting resins or ultraviolet curable resins, such as a (meth) acrylic-type, urethane type, an acrylurethane type, an epoxy type, and a silicone type, can also be used. It may be desirable to use polyethylene terephthalate in view of economical and easy access.

Referring to FIG. 2, when the window protection film 400 having the slow axis 401 such as polyethylene terephthalate is disposed on one surface of the window 300, the absorption axis 201 of the polarizing plate 200 is provided. According to the mutual angle θ between the slow axis and the slow axis 401, the specular reflectance of the light reflected from the fingerprint is changed, which may cause a change in the fingerprint recognition rate.

Accordingly, the fingerprint sensor recognition rate improving means according to an aspect of the present invention includes a) a mutual angle θ between the absorption axis 201 of the polarizing plate 200 and the slow axis 401 of the window protective film 400 − By adjusting it to 15 ° to 15 ° or 75 ° to 105 °, it is possible to improve the specular reflectance of the light reflected from the fingerprint, thereby improving the fingerprint recognition rate in the fingerprint sensor.

According to an embodiment of the present invention, the specular reflectance improved by the same method as a) may be 33% or more, in which case the fingerprint recognition rate in the fingerprint sensor is advantageous.

In addition, according to another aspect of the present invention for improving the fingerprint sensor recognition rate, b) the λ / 4 phase difference layer 600 is further included between the polarizing plate 200 and the window protection film 400, the polarizing plate 200 The specular reflectance of the light reflected from the fingerprint may be maintained at a constant level irrespective of the mutual angle θ between the absorption axis 201 and the slow axis 401 of the window protective film 400 (see FIG. 2). .

In this case, the details of the lambda / 4 phase difference layer 600 further included may be the same as the content of the lambda / 4 phase difference layer included in the polarizing plate 200 described above, the lambda / 4 phase difference layer further included The same kind may be used for the lambda / 4 phase difference layer included in the 600 and the polarizing plate, and different kinds may be used (see (c) and (d) of FIG. 1).

According to an embodiment of the present invention, the specular reflectance according to the b) means is 23 to 27%, and the specular reflectivity is thus between the absorption axis of the polarizing plate and the slow axis 401 of the window protective film 400. Window protective film 400 laminated by controlling the ambient conditions, such as increasing the amount of light irradiation of the self-luminous panel 100 included in the optical sensor module (000) when maintained at a constant level irrespective of the mutual angle (θ) Regardless of the type of), the fingerprint recognition rate can be improved.

Fingerprint Sensor (500)

The optical sensor module 000 according to an aspect of the present invention includes a fingerprint sensor unit 500.

The fingerprint sensor unit 500 is located on the other side of the surface where the polarizing plate 200 of the self-luminous panel 100 is located, and is irradiated from the self-luminous panel 100 to be the window protective film 400 or the window 300. It serves to detect the reflected light reflected from the fingerprint of the user in contact with the surface of (see Figure 1).

In the present invention, a specific configuration and method of the fingerprint sensor unit 500 for detecting the reflected light is not particularly limited, and the configuration may be variously applied and changed according to the detection method.

As an example, the fingerprint sensor unit 500 may be in contact with the self-light emitting panel 100 to transmit light that is emitted from the self-light emitting panel 100 and returned from the upper window 300, and within the transparent block. The optical sensor array may be configured to image received light onto the optical sensor array. Such an array of optical sensors can be positioned in relation to a fingerprint sensing area that can be located in a window, and when there is no contact with the human skin, the upper window when in contact with the human skin without receiving return light from a specified light source And may selectively receive return light through total internal reflection at the surface of the.

Alternatively, the fingerprint sensor unit 500 is located under the self-light emitting panel 100, and extracts the light from the optical wedge and the self-light emitting panel 100 so as to extract light from the self-light emitting panel 100 in contact with the optical wedge. And an optical sensor array for receiving the received light from the optical wedge, and an optical imaging module positioned between the optical wedge and the optical sensor array to form light from the optical wedge onto the optical sensor array.

Or an optical transmission block for receiving the reflected light reflected from the fingerprint by the light emitted from the self-luminous panel 100, wherein the received light enters the optical imaging unit as part of an image detection block to Each configuration may be included so as to be imaged in a photo detector sensing array or light sensing array in the sensing block.

In addition to the specific configuration and method for detecting the reflected light in the optical sensor module of the present invention may be the same as described in the Republic of Korea Patent Publication No. 10-2017-0106425.

<Image display device>

Another aspect of the present invention is an image display device including the above-described optical sensor module (000), by including the above-described optical sensor module (000) has the advantage that the fingerprint recognition rate is more excellent.

The image display device includes, for example, a liquid crystal projector, a display device for a game machine, a display device for a mobile terminal such as a mobile phone, a display device for a digital camera, a display device for a car navigation device, a monitor screen display device such as a notebook computer, and the like. For example, an image display device equipped with a fingerprint recognition sensor may be applied without particular limitation.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but the following examples are merely for exemplifying the present invention, and various changes and modifications within the scope and spirit of the present invention are apparent to those skilled in the art. Naturally, such modifications and variations fall within the scope of the appended claims. In the following Examples and Comparative Examples, "%" and "parts" indicating contents are by weight unless otherwise specified.

Production Example  1. Preparation of Polarizing Plate

TAC film (Konica minlota, KC2UAW), PVA film (kuraray, VF-PE3000), TAC film (Konica minlota, KC2UAW), PSA layer (Lintek, 5um acrylic PSA), λ / 2 phase difference layer (Fujifilm) , QLAA218), PSA layer (Lintek, 5um acrylic PSA), lambda / 4 phase difference layer (Fujifilm, QLAB218), PSA layer (Lintek, 25um acrylic PSA) was sequentially laminated to prepare a polarizing plate.

Experimental Example  1. Measurement of Specular Reflectance

An optical laminate was manufactured by sequentially laminating glass as a window substrate from a lower portion, a polyethylene terephthalate (PET) film as a window protective film, a polarizing plate and glass of Preparation Example 1 above.

In the glass disposed on the lower side, a reflecting plate having a SCI reflectance of 96%, which may cause specular reflection on the surface where the window protective film is not attached, is laminated, and the light reflected from the reflecting plate on the surface where the polarizing plate is not attached on the glass laminated on the upper surface The measuring instrument (CM2600d, Konicaminolta) was placed. At this time, the CM2600d was used as the light source.

After the light irradiated from the OLED panel reaches the reflecting plate, the specular reflectance reflected and returned is measured. At this time, the reflectance for each mutual angle is measured while changing the mutual angle between the polarizing plate absorption axis and the PET film at 15 ° intervals. It was. The specular reflectance was calculated by the same method as in Equation 1 below.

[Equation 1]

Specular reflectance = SCI (specular component) reflectance-SCE (specular component excluded) reflectance

At this time, the results of the specular reflectance for each measured mutual angle is shown in Table 1 and FIG.

Between absorption axis of polarizer and PET film
Mutual Angle (°) SCI SCE Specular reflectance (%) reflectivity(%) a * ¹⁾ b * ²⁾ reflectivity(%) a * ¹⁾ b * ²⁾ 0 37.86 -4.46 10.39 0.01 0.37 -0.65 37.85 15 37.22 3.76 9.08 0.02 0.09 -0.91 37.2 30 31.27 7.95 5.74 0.18 -3.16 -0.43 31.09 45 28.48 -0.75 7.6 0.17 -0.92 1.24 28.31 60 29.91 -12.82 11.49 0.19 3.11 0.33 29.72 75 34.55 -15.5 12.8 0.1 2.08 -0.31 34.45 90 37.62 -7.45 10.82 0.08 2.67 -5.13 37.54 105 37.77 2.08 9.2 0.02 0.46 -1.04 37.75 120 33.72 2.07 10.05 0.07 -1.21 -1.68 33.65 135 25.58 1.78 8.78 0.32 3.94 -4.12 25.26 150 29.18 -10.74 8.47 0.07 1.92 -2.67 29.11 165 33.81 -12.35 10.34 0.03 1.43 -2.19 33.78 180 37.68 -5.1 10.53 0.01 1.17 -2.14 37.67 1) Color coordinates, indicating the degree of green and red.
2) As a color coordinate, it shows the degree of yellow and blue.

Referring to Table 1 and Figure 3, it was confirmed that the specular reflectance is improved when the mutual angle between the absorption axis of the polarizing plate and the slow axis of the window protective film satisfies the configuration of a) means of the present invention.

Experimental Example  2. Measurement of Specular Reflectance

An optical laminate was prepared by sequentially laminating glass as a window substrate, a window protective film, a polyethylene terephthalate (PET) film, a λ / 4 retardation layer (Fujifilm, QLAB218), a polarizing plate and the glass of Preparation Example 1 above, from the bottom. It was.

In the glass disposed on the lower side, a reflector having a SCI reflectance of 96%, which may cause specular reflection on the surface where the window protective film is not attached, is laminated, and the glass that is laminated on the upper surface is reflected from the reflector on the surface where the polarizer is not attached. A measuring instrument (CM2600d, Konicaminolta) was used to measure light. At this time, the CM2600d was used as the light source.

After the light irradiated from the OLED panel reaches the reflecting plate, the specular reflectance reflected and returned is measured. At this time, the reflectance for each mutual angle is measured while changing the mutual angle between the polarizing plate absorption axis and the PET film at 15 ° intervals. It was. The specular reflectance was calculated in the same manner as in Equation 1 above.

At this time, the results of the specular reflectance for each measured mutual angle are shown in Table 2 and FIG.

Between absorption axis of polarizer and PET film
Mutual Angle (°) SCI SCE Specular reflectance (%) reflectivity(%) a * b * reflectivity(%) a * b * 0 23.92 4.84 5.10 0.03 0.19 0.33 23.89 15 23.82 3.34 5.56 0.10 -0.50 1.36 23.72 30 23.44 1.57 5.58 0.14 -1.08 1.87 23.30 45 23.46 -1.86 6.19 0.08 0.83 1.03 23.38 60 24.46 -4.82 8.10 0.08 1.50 1.00 24.38 75 25.70 -6.90 10.49 0.05 1.05 0.60 25.65 90 26.50 -8.16 11.93 0.02 0.65 0.18 26.48 105 26.37 -8.45 12.08 0.03 0.84 0.25 26.34 120 24.94 -7.58 9.22 0.01 0.03 0.01 24.93 135 23.77 -2.73 6.31 0.01 0.00 0.00 23.76 150 23.60 3.54 4.40 0.01 0.00 0.00 23.59 165 23.92 6.68 4.39 0.02 -0.01 0.09 23.90 180 24.14 6.69 4.91 0.01 0.02 0.03 24.13 1) Color coordinates, indicating the degree of green and red.
2) As a color coordinate, it shows the degree of yellow and blue.

Referring to Table 2 and FIG. 4, it was confirmed that the specular reflectance is maintained at a constant level when the λ / 4 retardation layer is further included between the window protection film and the polarizing plate as suggested in the present invention.

Experimental Example  3. Fingerprint Recognition Difference Experiment

A smartphone (NEX, manufactured by Vovo) including a polarizing plate, a self-luminous panel, a window, and a fingerprint sensor was prepared. By stacking PET films as various window protection films on the smart phone at various angles, the fingerprint recognition speed is measured in each case where the mutual angles of the absorption axis of the smartphone including the polarizing plate and the slow axis of the window protection film are different from each other. The results are shown in Table 3 below.

Mutual Angle (°) Fingerprint recognition speed (sec) Example 0 One Control × One Comparative Example 1 45 3 Comparative Example 2 150 5

Referring to Table 3, in the case of the embodiment satisfying the mutual angle presented in the present invention, it was confirmed that the comparative example and the fingerprint recognition speed when the window protection film is not attached, the equivalent level, the mutual angle presented in the present invention In Comparative Examples 1 and 2 that deviate from it was confirmed that the fingerprint recognition rate is significantly lower than the control example.

000: optical sensor module 200: polarizing plate
100: self-luminous panel 201: absorption axis
101: panel substrate 300: window
102: pixel electrode 400: window protection film
103: pixel defining layer 401: slow axis
104: display layer 500: fingerprint sensor
105: counter electrode 600: lambda / 4 phase difference layer
106: encapsulation layer θ: mutual angle

Claims (8)

A self-luminous panel for irradiating light;
A polarizer disposed on one surface of the self-luminous panel;
A window positioned on one surface of the polarizer;
A window protective film on at least one surface of the window;
A fingerprint sensor unit positioned on the other surface of the surface of the polarizing plate of the self-luminous panel and sensing light reflected from the fingerprint of the user by being emitted from the self-luminous panel; And
a) the mutual angle between the absorption axis of the polarizing plate and the slow axis of the window protective film is -15 ° to 15 ° or 75 ° to 105 ° or
b) a fingerprint recognition rate improving means further comprising a λ / 4 phase difference layer between the polarizing plate and the window protective film. The method of claim 1,
The window protective film is an optical sensor module, characterized in that the polyethylene terephthalate (PET) film. The method of claim 1,
The polarizing plate further comprises a circularly polarized retardation film. The method of claim 1,
The self-light emitting panel includes a pixel electrode, a pixel defining layer, a display layer, an opposite electrode, and an encapsulation layer. The method of claim 1,
The polarizing plate comprises a substrate, a polarizer layer, a circular polarization retardation layer and an adhesive layer. The method of claim 1,
The specular reflectance of the light reflected from the fingerprint in the means a) is at least 33%. The method of claim 1,
The specular reflectance of the light reflected from the fingerprint in the means b) is 23 to 27%. An image display apparatus comprising the optical sensor module according to any one of claims 1 to 7.

Images