KR102197941B1 - 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), comprising: a self-luminous panel (100) for irradiating light; A polarizing plate 200 positioned on one surface of the self-luminous panel 100; A window 300 positioned on one surface of the polarizing plate 200; A window protection film 400 positioned on at least one surface of the window 300; A fingerprint sensor unit 500 that is located on the other surface of the surface of the self-luminous panel 100 on which the polarizing plate 200 is located, and is irradiated from the self-luminous panel 100 to detect light reflected from a user's fingerprint; Including, 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° Adjusting the specular reflectance to improve the fingerprint recognition rate of the fingerprint sensor; b) A λ/4 phase difference 600 layer is further included between the polarizing plate 200 and the window protective film 400 so that the specular reflectance of the absorption axis 201 of the polarizing plate 200 and the window protective film 400 It is possible to improve the fingerprint recognition rate of the fingerprint sensor without additional mutual angle adjustment when used with additional means such as increasing the light irradiation amount of the self-luminous panel included together by maintaining it at a constant level regardless of the mutual angle between the slow axes 401. It is characterized.

Description

TECHNICAL FIELD The optical sensor module including a means for improving the fingerprint recognition rate of an optical fingerprint sensor TECHNICAL FIELD {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 an optical fingerprint sensor.

Recently, various sensors have been implemented in electronic devices or systems to provide a desired function. In this process, only authorized users are recognized, and the need to secure access by means of distinguishing unauthorized users is increasing.

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, so personal portable electronic devices contain users' personal information, companies or businesses. There is an increasing need to equip electronic devices such as computers for use with one or more security mechanisms that can use or protect information in an organization or enterprise device or system by allowing only authorized personnel to access them.

In the case of secure access to a portable electronic device such as a mobile device, various methods can 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 reduce the level of security, and users must remember passwords in order to use password-protected electronic devices or systems, and if they forget passwords, users may It is inconvenient to be authenticated by performing a password recovery procedure or to regain access to the device. In various situations, such a password recovery process can be a burden to the user, and presents various practical limitations and inconveniences.

In order to minimize such user inconvenience, fingerprint sensors have been recently developed and used, and these fingerprint sensors are largely divided into capacitive type and optical type. The capacitive fingerprint sensor uses a semiconductor device sensitive to voltage and current to detect static electricity caused by the fingerprint of the human body to recognize the fingerprint, whereas the optical fingerprint sensor has a structure including a light source and an optical sensor. Detects the light emitted from the light source to recognize the user's fingerprint. The optical fingerprint sensor is more durable than the capacitive type, so the demand for the 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 provides a touch sensing operation and operates to emit light forming a part of the display image. A device screen comprising a display panel structure having capable light emitting display pixels; An upper transparent layer formed on the device screen as an interface for displaying an image to a user by being touched by a user for the touch sensing operation and transmitting light from the display panel structure; And an optical sensor module positioned under 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 has a problem in that the fingerprint recognition rate is lowered when a window protection film additionally attached by the user for the purpose of protecting the window is added.

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

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

The optical sensor module of the present invention for achieving the above object includes a self-luminous panel for irradiating light; A polarizing plate positioned on one surface of the self-luminous panel; A window positioned on one surface of the polarizing plate; A window protection film positioned on at least one surface of the window; A fingerprint sensor unit positioned on the other surface of the surface of the self-luminous panel on which the polarizing plate is located, and sensing light reflected from the user's fingerprint by being irradiated from the self-luminous panel; And a) a 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. It characterized in that it comprises a fingerprint recognition rate improvement means that the layer is further included.

In addition, the image display device according to the present invention is characterized in that it includes the optical sensor module described above.

The optical sensor module including the fingerprint sensor recognition rate improvement means of the present invention has the advantage of improving the fingerprint recognition rate.

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

1 is a schematic diagram showing the structure of an optical sensor module of the present invention.
2 is a diagram schematically 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 each other.
4 is a diagram showing a change in specular reflectance according to mutual angles for an optical sensor module further including a λ/4 retardation layer in the present invention.
5 is a diagram schematically showing the structure of the self-luminous panel of the present invention.

In the present invention, when a member is positioned "on" another member, this includes not only the case where the member is in direct contact with the other member, but also the case where another member is interposed between the two members.

In the present invention, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

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

1 and 2, an optical sensor module 000 according to an aspect of the present invention includes a self-luminous panel 100 for irradiating light; A polarizing plate 200 positioned on one surface of the self-luminous panel 100; A window 300 positioned on one surface of the polarizing plate 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 self-luminous panel 100 on which the polarizing plate 200 is located, irradiated from the self-luminous panel 100 and detecting light reflected from the user's fingerprint; And a) a mutual angle (θ) between the absorption axis 201 of the polarizing plate 200 and the slow axis 401 of the window protection film 400 is -15° to 15° or 75° to 105°, or b) A λ/4 retardation layer 600 between the polarizing plate 200 and the window protective film 400 further includes a fingerprint recognition rate improving means, thereby emitting from the self-luminous panel 100 There is an advantage in that the fingerprint recognition rate is improved by improving the specular reflectance when the generated 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 as described above a) By adjusting to -15° to 15° or 75° to 105°, the regular reflectance when the 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 ease of use has the advantage of improving the fingerprint recognition rate.

In addition, when described with reference to FIGS. 1 and 4, when the λ/4 retardation layer 600 is further included between the polarizing plate 200 and the window protective film 400 like the means b), when reflected by a fingerprint Regardless of the mutual angle of the polarizing plate 200 and the window protection film 400, the specular reflectance of can be maintained at a constant level, for example, at a level of 23 to 27%. In this case, self-emission included together as an example There is an advantage in that the fingerprint recognition rate can be improved by improving the overall specular reflectance irrespective of the mutual angle through an additional method such as increasing the amount of light of the panel 100.

<Optical sensor module (000)>

The optical sensor module 000 according to an aspect of the present invention includes the means for improving the fingerprint sensor recognition rate as described above, thereby improving the fingerprint recognition rate.

The structure of the optical sensor module 000 of the present invention is, for example, with reference to FIG. 1, the fingerprint sensor unit 500, the self-luminous panel 100, the polarizing plate 200, and the window 300 sequentially from the lower surface. , The window protection film 400 may be arranged, but is not limited thereto, and the window protection film 400 may be included between the polarizing plate 200 and the window 300 as necessary. In addition, depending on the needs of the developer, other configurations other than the above-described configurations that do not impair the purpose of the optical sensor module 000 may be further included.

Self-luminescence Panel(100)

The optical sensor module 000 according to an 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, a counter electrode 105, and an encapsulant disposed on the panel substrate 101. It may include a ration 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 film may be formed to cover the pixel circuit. The pixel electrode 102 may be electrically connected to, for example, a drain electrode of a TFT on the insulating layer.

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

A counter 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 for protecting the display panel may be stacked on the counter electrode 105.

Polarizer (200)

The optical sensor module 000 according to an aspect of the present invention includes a polarizing plate 200.

The polarizing plate 200 may include a substrate, a polarizer layer, a circularly polarized 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), Polyethyelenen napthalate (PEN), polyethylene terephthalide (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 converting natural light into linearly polarized light, and is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, and a step of adsorbing the dichroic dye by dyeing a polyvinyl alcohol-based resin film with a dichroic dye. , The polyvinyl alcohol-based resin film to which the dichroic dye is adsorbed is treated with an aqueous boric acid solution, and after treatment with an aqueous boric acid solution, it is prepared by washing with water, 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 side, but is not limited thereto.

Specifically, the circularly polarized phase difference layer may include a λ/4 phase difference layer and a λ/2 phase difference 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 a form in which a separate optical anisotropic layer is laminated on a support made of a polymer film. The constituent material of the optically anisotropic layer is not particularly limited in the present invention, but may be a layer formed from a composition containing a liquid crystal compound and exhibiting optical anisotropy expressed by the orientation of molecules of the liquid crystal compound, or a polymer It may be a layer having optical anisotropy in which the film is stretched and the polymer in the film is oriented and expressed, or a layer having both layers may be used. That is, it may be composed of one or two or more biaxial films, and may be composed of a combination of two or more uniaxial films, and of course, a combination of one or more biaxial films and one or more uniaxial films. It can also be configured by doing.

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 equation may be achieved in any wavelength (for example, 550 nm) in the visible light region.

In the present invention, Re(λ) means in-plane retardation at a wavelength λ. The said Re(λ) is measured by injecting light having a wavelength of λ nm in the film normal direction in KOBRA 21ADH or WR (manufactured by Oji Measuring Instruments Co., Ltd.). In the selection of the measurement wavelength λnm, the wavelength selection filter can be manually replaced, or the measured value can be converted into a program for measurement.

The λ/2 retardation layer may be an optically anisotropic support having a desired λ/4 function as a support itself, or may be a form in which a separate optical anisotropic layer is laminated on a support made of a polymer film. The constituent material of the optically anisotropic layer is not particularly limited in the present invention, but may be a layer formed from a composition containing a liquid crystal compound and exhibiting optical anisotropy expressed by the orientation of molecules of the liquid crystal compound, or a polymer It may be a layer having optical anisotropy in which the film is stretched and the polymer in the film is oriented and expressed, or a layer having both layers may be used. That is, it may be composed of one or two or more biaxial films, and may be composed of a combination of two or more uniaxial films, and of course, a combination of one or more biaxial films and one or more uniaxial films. It can also be configured by doing.

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

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

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)acrylic monomer having a functional group in the presence of a polymerization initiator, and has a glass transition temperature (Tg) It is possible to use an acrylic pressure-sensitive adhesive containing an acrylic resin of 0°C or less and a crosslinking agent.

Examples of the adhesive include a water-based adhesive in which an adhesive component is dissolved or dispersed in water, and a composition that is cured by receiving active energy ray irradiation (hereinafter, sometimes referred to as an active energy ray-curable adhesive).

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

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

window (300)

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

The window 300 may generally be positioned on the surface of the optical sensor module 000, but may be further included anywhere between each layer constituting the optical sensor module 000, if necessary.

The window 300 may be applied to, for example, an LCD device, an OLED device, a touch screen panel (TSP), and the like, and may include a material having durability against external impacts and transparency that can be visually recognized by a user. The window 300 is, for example, glass, polyimide (PI), polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene or 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, and these may be used alone or in combination of two or more.

Among these, glass can be preferably used.

The window 300 may include, for example, a hard coating film, and a light shielding pattern may be formed on a peripheral portion of the window substrate. The shading pattern may include, for example, a color printing pattern, and may have a single layer or a multilayer structure. A bezel part or a non-display area of an image display device 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 protection film 400 may be disposed on any of the upper/lower sides of the above-described window 300 as needed, and may be disposed from the time of manufacture of the optical sensor module 000 according to the needs of the manufacturer, or the user It may be additionally laminated on the surface of the window 300 according to the need of.

Specifically, 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, depending on the needs of the user, and in this case, protecting the window 300 from external impact. Can play a role.

In addition, the window protection film 400 may be laminated under the window 300, that is, on a surface between the polarizing plate 200 and the window 300, depending on the needs of the designer. In this case, the user Even if a tool such as the like is used, the protective film 400 has the advantage of removing the polarization of the sunglasses so that the screen can be properly viewed.

At this time, the window protection film 400 may be selected in consideration of transparency, mechanical strength, thermal stability, moisture shielding property, isotropic property, etc., for example, polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, polybutylene Polyester resins such as terephthalate; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resin; Acrylic resins such as polymethyl (meth)acrylate and polyethyl (meth)acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymer; Polyolefin resins such as polyethylene, polypropylene, polyolefin having a cyclo-based or norbornene structure, and ethylene-propylene copolymer; Vinyl chloride resin; Amide resins such as nylon and aromatic polyamide; Imide resin; Polyethersulfone resin; Sulfone resin; Polyether ether ketone resin; Sulfide polyphenylene resin; Vinyl alcohol resin; Vinylidene chloride resin; Vinyl butyral resin; Allylate resin; Polyoxymethylene resin; It includes a film made of a thermoplastic resin such as an epoxy resin, and a film made of a blend of the thermoplastic resin may also be used. In addition, a film made of a thermosetting resin such as (meth)acrylic, urethane, acrylic urethane, epoxy, silicone, or an ultraviolet curable resin may be used. It may be preferable to use polyethylene terephthalate from the viewpoint of economical and easy accessibility.

Referring to FIG. 2, when the window protection film 400 having a slow axis 401 such as polyethylene terephthalate is disposed on one side of the window 300, the absorption axis 201 of the polarizing plate 200 The regular reflectance of light reflected from the fingerprint may vary according to the mutual angle θ between the and the slow axis 401, so that a change in the fingerprint recognition rate may occur.

Therefore, the means for improving the recognition rate of the fingerprint sensor according to an aspect of the present invention is 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- By adjusting it to 15° to 15° or 75° to 105°, it is possible to improve the specular reflectance of light reflected from the fingerprint, and thus, there is an advantage in that the fingerprint recognition rate in the fingerprint sensor is further improved.

According to an embodiment of the present invention, the improved specular reflectance by the same method as means a) may be 33% or more, and in this case, there is an advantage in that the fingerprint recognition rate in the fingerprint sensor is good.

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

In this case, the details of the λ/4 retardation layer 600 further included may be the same as the contents of the λ/4 retardation layer included in the polarizing plate 200 described above, and the further included λ/4 retardation layer The same type may be used for 600 and the λ/4 retardation layer included in the polarizing plate, or different types may be used (see (c) and (d) of FIG. 1 ).

According to an embodiment of the present invention, the specular reflectance according to the means b) is 23 to 27%, and in this way, the specular reflectance is between the absorption axis of the polarizing plate and the slow axis 401 of the window protection film 400 When maintained at a certain level regardless of the mutual angle (θ), the window protection film 400 is laminated by adjusting the ambient conditions together, such as increasing the amount of light irradiation of the self-luminous panel 100 included in the optical sensor module 000. Regardless of the type of ), there is an advantage of improving the fingerprint recognition rate.

Fingerprint sensor part (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 surface of the surface of the self-luminous panel 100 on which the polarizing plate 200 is located, and is irradiated from the self-luminous panel 100 to provide a window protection film 400 or a window 300. It serves to detect the reflected light reflected from the user's fingerprint contacting the surface of (see FIG. 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 sensing method.

As an example, the fingerprint sensor unit 500 contacts the self-luminous panel 100 to receive light emitted from the self-luminous panel 100 and returned from the upper window 300, and It may include an optical sensor array that images the received light on the optical sensor array. Such an optical sensor array can be located in relation to a fingerprint detection area that can be located in a window, and when there is no contact with the human skin, the upper window when contacting the human skin without receiving the return light from the designated light source. May be configured to selectively receive return light through total internal reflection at the surface of the.

Alternatively, the fingerprint sensor unit 500 is located under the self-luminous panel 100 and is extracted from an optical wedge or self-luminous panel 100 that allows light to be extracted from the self-luminous panel 100 in contact with the optical wedge. It may be configured to include an optical sensor array for receiving the generated light from the optical wedge, and an optical imaging module positioned between the optical wedge and the optical sensor array to image light from the optical wedge on the optical sensor array.

Alternatively, the light emitted from the self-luminous panel 100 may include an optical transmission block for receiving reflected light reflected from the fingerprint and returned, and the received light enters the optical imaging unit as part of the imaging detection block, and the Each configuration may be included so that an image is formed on the photo detector sensing array or the photo sensing array in the sensing block.

In addition to this, a specific configuration and method for detecting reflected light in the optical sensor module of the present invention may be the same as described in Korean Patent Laid-Open No. 10-2017-0106425.

<Image display device>

Another aspect of the present invention is an image display device including the optical sensor module 000 described above, and has an advantage of having a better fingerprint recognition rate by including the optical sensor module 000 described above.

The image display device includes, for example, a liquid crystal projector, a display device for a game console, a display device for a portable terminal such as a mobile phone, a display device for a digital camera, a display device for car navigation, a monitor screen display device such as a notebook computer or a computer. However, any image display device equipped with a fingerprint recognition sensor can be applied without any particular limitation on its type.

Hereinafter, preferred examples are presented to aid in understanding the present invention, but the following examples are only illustrative of the present invention, and that various changes and modifications are possible within the scope of the present invention and the scope of the technical idea are obvious to those skilled in the art. , It is natural that such modifications and modifications fall within the appended claims. In the following Examples and Comparative Examples, "%" and "parts" indicating the content are based on weight unless otherwise specified.

Manufacturing example 1. Manufacturing 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 retardation layer (Fujifilm) , QLAA218), a PSA layer (Lintek, 5um acrylic PSA), a λ/4 retardation layer (Fujifilm, QLAB218), and a PSA layer (Lintek, 25um acrylic PSA) were sequentially stacked to prepare a polarizing plate.

Experimental example 1. Measurement of specular reflectance

From the bottom, glass as a window substrate, a polyethylene terephthalate (PET) film as a window protective film, and the polarizing plate and glass of Preparation Example 1 were sequentially laminated to prepare an optical laminate.

In the glass disposed below, a reflector having a SCI reflectance of 96%, which can cause specular reflection, is stacked on the surface to which the window protection film is not attached, and light reflected from the reflector on the surface of the glass laminated on the upper surface to which the polarizing plate is not attached. A measuring device (CM2600d, Konicaminolta) was placed to measure. At this time, the CM2600d was used as a light source.

After the light irradiated from the OLED panel reaches the reflector, the reflective and returning regular reflectance was measured. At this time, the reflectance for each mutual angle was measured while changing the mutual angle between the polarizing plate absorption axis and the PET film at 15° intervals. I did. The specular reflectance was calculated in the same manner 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 of the measured mutual angles are shown in Table 1 and FIG. 3 below.

Between the absorption axis of the polarizing plate and the 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) As a color coordinate, it indicates the degree of green and red.
2) As a color coordinate, it indicates the degree of yellow and blue.

Referring to Tables 1 and 3, 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 the means a) of the present invention, it was confirmed that the regular reflectance was improved.

Experimental example 2. Measurement of specular reflectance

From the bottom, 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 glass of Preparation Example 1 are sequentially laminated to prepare an optical laminate. I did.

A reflective plate having a SCI reflectance of 96%, which can cause specular reflection, is stacked on the surface of the glass disposed on the lower side of the glass on which the window protection film is not attached. A measuring device for measuring light (CM2600d, Konicaminolta) was placed. At this time, the CM2600d was used as a light source.

After the light irradiated from the OLED panel reaches the reflector, the reflective and returning regular reflectance was measured. At this time, the reflectance for each mutual angle was measured while changing the mutual angle between the polarizing plate absorption axis and the PET film at 15° intervals. I did. 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. 4 below.

Between the absorption axis of the polarizing plate and the 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) As a color coordinate, it indicates the degree of green and red.
2) As a color coordinate, it indicates the degree of yellow and blue.

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

Experimental example 3. Fingerprint recognition rate difference experiment

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

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

Referring to Table 3, in the case of the embodiment that satisfies the mutual angle suggested in the present invention, it was confirmed that the fingerprint recognition speed was at the same level as the control example when the window protection film was not attached, and the mutual angle suggested by the present invention In the case of Comparative Examples 1 and 2, which deviated from, it was confirmed that the fingerprint recognition speed was significantly lower than that of the control example.

000: optical sensor module 200: polarizer
100: self-luminous panel 201: absorption axis
101: panel substrate 300: window
102: pixel electrode 400: window protective film
103: pixel defining layer 401: slow axis
104: display layer 500: fingerprint sensor unit
105: counter electrode 600: λ/4 retardation layer
106: encapsulation layer θ: mutual angle

Claims (8)

A self-luminous panel that irradiates light;
A polarizing plate positioned on one surface of the self-luminous panel;
A window positioned on one surface of the polarizing plate;
A window protection film positioned on at least one surface of the window;
A fingerprint sensor unit positioned on the other surface of the surface of the self-luminous panel on which the polarizing plate is located, and sensing light reflected from the user's fingerprint 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 retardation layer is further included between the polarizing plate and the window protective film,
The optical sensor module comprising a fingerprint recognition rate improvement means in which the specular reflectance of light reflected from the fingerprint in the b) means is 23 to 27%. 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-luminous panel comprises a pixel electrode, a pixel defining layer, a display layer, a counter electrode, and an encapsulation layer. The method of claim 1,
The polarizing plate is an optical sensor module comprising a substrate, a polarizer layer, a circularly polarized retardation layer, and an adhesive layer. The method of claim 1,
The optical sensor module, characterized in that the specular reflectance of light reflected from the fingerprint in the means a) is 33% or more. delete An image display device comprising the optical sensor module according to any one of claims 1 to 6.

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