KR102542872B1 - Fingerprint sensing module and display device with a built-in optical image sensor - Google Patents

Abstract

An optical image sensor built-in display device includes a display panel, a light source disposed adjacent to the display panel, and an optical substrate unit. A sensing area is defined in the optical substrate unit to cover the display panel, and the optical substrate unit guides light provided from a light source to the sensing area. The display panel includes a base substrate, pixels disposed on the base substrate, an optical image sensor, and an optical filter element. The optical filter element covers the optical image sensor, and the optical filter element includes a light absorbing portion and a light transmitting portion each extending in a direction inclined with respect to the base substrate when viewed in cross section.

Description

Fingerprint sensing module and display device with built-in optical image sensor

The present invention relates to a display device incorporating a fingerprint sensing module and an optical image sensor, and more particularly, a fingerprint sensing module for sensing an image of a living body such as a human fingerprint and an optical image sensor for recognizing an image of a living body. It's about the display.

As various portable information processing devices such as notebook computers, tablet computers, and smart phones are developed, users can process various tasks using the portable information processing devices.

Meanwhile, since such a portable information processing device has a risk of loss, methods for improving the security of the portable information processing device so that other users cannot operate the portable information processing device are being studied. For example, a smartphone with improved security is being developed using biometric information such as a user's fingerprint or face.

On the other hand, such a smartphone may be provided with an optical image sensor. As the accuracy of the optical image sensor for recognizing a user's fingerprint or face improves, the security of the smartphone can be improved, and the user's biometric information can be re-recognized. Since the number of times is reduced, user convenience may be improved.

An object of the present invention is to provide a fingerprint sensing module having an optical image sensor with improved accuracy in recognizing user's biometric information, and a display device with an optical image sensor embedded therein.

An optical image sensor built-in display device according to the present invention for achieving the object of the present invention includes a display panel, a light source disposed adjacent to the display panel, and an optical substrate unit. A sensing area is defined in the optical substrate unit to cover the display panel, and the optical substrate unit guides light provided from the light source to the sensing area.

The display panel includes a base substrate, pixels disposed on the base substrate, an optical image sensor, and an optical filter element. The optical image sensor is disposed on the base substrate, and the optical image sensor senses biometric information of a user contacting the sensing area using light guided by the optical substrate unit.

The optical filter element covers the optical image sensor, and the optical filter element includes a light absorbing part and a light transmitting part each extending in a direction inclined with respect to the base substrate when viewed in cross section.

In one embodiment of the present invention, each of the light absorbing portion and the light transmitting portion is provided in plurality, and in the optical filter element, the plurality of light absorbing portions and the plurality of light transmitting portions are alternately arranged with each other.

In one embodiment of the present invention, an upper end of one of two light absorbing parts adjacent to each other among the plurality of light absorbing parts overlaps a lower end of the other one.

In one embodiment of the present invention, the light transmission portion is defined as a through hole formed in an oblique direction with respect to the base substrate in the light filter element.

In one embodiment of the present invention, the optical image sensor faces the optical substrate unit with the base substrate interposed therebetween, and the optical filter element is located between the base substrate and the optical image sensor.

In one embodiment of the present invention, the optical substrate unit includes a cover substrate, a first refractive layer, a high refractive layer, a light guide film and a second low refractive layer. The cover substrate covers the display panel, and the first low refractive index layer is disposed between the cover substrate and the display panel. The high refractive index layer faces the cover substrate with the first low refractive index layer interposed therebetween, and the high refractive index layer has a higher refractive index than the first low refractive index layer. The light guide film faces the first low refractive index layer with the high refractive index layer interposed therebetween. The second low refractive index layer faces the high refractive index layer with the light guide film interposed therebetween, and the second low refractive index layer has a refractive index smaller than each of the high refractive index layer and the light guide film.

In one embodiment of the present invention, the light guide film includes a light emitting element and a light receiving element. The light emitting element is positioned to correspond to the display area of the display panel, and the light emitting element emits light totally reflected inside the light guide film to the outside. The light-incident element is positioned to correspond to the non-display area of the display panel, and the light-incident element guides the light provided from the light source to the light-exit element.

In one embodiment of the present invention, the light source generates infrared light.

Another optical image sensor built-in display device according to the present invention for achieving the above objects includes a display panel, a light source disposed adjacent to the display panel, and an optical substrate unit. The optical substrate unit covers the display panel by defining a sensing area for sensing biometric information, and the optical substrate unit guides light provided from the light source toward the sensing area.

The display panel includes a base substrate, pixels disposed on the base substrate, an optical image sensor disposed on the base substrate and configured to sense the biometric information using light guided by the optical substrate unit, and disposed on the base substrate. and a first light absorption pattern positioned between the optical substrate unit and the optical image sensor.

In addition, the pixels include a plurality of anodes, and the first light absorption pattern includes a plurality of first light absorption elements spaced apart from each other and arranged alternately with the plurality of anodes.

In one embodiment of the present invention, the display panel further includes a second light absorption pattern, and the second light absorption pattern is disposed on the base substrate to face the first light absorption pattern with the base substrate interposed therebetween. do.

The second light absorption pattern includes a plurality of second light absorbing elements, and the plurality of second light absorbing elements are spaced apart from each other and are alternately arranged with the plurality of first light absorbing elements.

A fingerprint sensing module according to the present invention for achieving the object of the present invention includes an optical image sensor and an optical filter element. The optical image sensor senses user's biometric information using light. The optical filter element covers the optical image sensor, and the optical filter element includes a light absorbing portion and a light transmitting portion each extending in a direction inclined with respect to the optical image sensor when viewed in cross section.

According to one embodiment of the present invention, the optical filter element covering the optical image sensor includes a light absorbing part and a light transmitting part each extending in a direction inclined to a normal direction of the display panel or the optical image sensor. Therefore, the external light guided by the optical board unit and traveling toward the optical image sensor through a path other than the path of light reflected from the user's fingerprint is blocked by the optical filter element, and thus the amount of external light flowing into the optical image sensor. As this is minimized, the sharpness of the image of the user's fingerprint generated by the optical image sensor can be improved.

According to an embodiment of the present invention, a light absorption pattern capable of blocking external light flowing into an optical image sensor is formed on a base substrate of a display panel. Therefore, an effect of minimizing the amount of external light introduced into the optical image sensor by the light absorption pattern may occur. In addition, since the light absorption pattern can be easily formed in a thin film form using a patterning process used to form the pixel portion of the display panel, alignment between the light absorption pattern and the anode can be facilitated.

1 is a perspective view of a display device with a built-in optical image sensor according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a surface taken along line II′ shown in FIG. 1 .
3 is a diagram illustrating a function of sensing a fingerprint in a display device having an embedded optical image sensor.
FIG. 4A is an enlarged view of the optical filter element shown in FIG. 3 .
4B is a cross-sectional view of an optical filter element and a display panel.
5 is a cross-sectional view of a display device with a built-in optical image sensor according to another embodiment of the present invention.
6 is a cross-sectional view of a display device with a built-in optical image sensor according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Objects, features and effects of the present invention described above will be understood through the embodiments related to the drawings. However, the present invention is not limited to the embodiments described herein, and may be applied and modified in various forms. Rather, the embodiments of the present invention to be described below are provided so that the technical spirit disclosed by the present invention can be more clearly explained, and furthermore, the technical spirit of the present invention can be sufficiently conveyed to those skilled in the art having average knowledge in the field to which the present invention belongs. Therefore, it should not be construed that the scope of the present invention is limited by the examples to be described later. On the other hand, the same reference numerals in the following embodiments and drawings indicate the same components.

In addition, in this specification, terms such as 'first' and 'second' are used for the purpose of distinguishing one component from another component without limiting meaning. In addition, when a part such as a film, region, component, etc. is said to be 'on' or 'on' another part, not only when it is directly above the other part, but also when another film, region, component, etc. is interposed therebetween. Including case

1 is a perspective view of a display device with a built-in optical image sensor according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II′ shown in FIG. 1 .

Referring to FIGS. 1 and 2 , the display device 500 (hereinafter referred to as 'display device') includes a display panel DP, an optical substrate unit 100 and a light source LS.

The display panel DP has a display area DA and a non-display area NDA. The display panel DP displays an image through the display area DA, and the non-display area NDA may be defined in the display panel DP in a shape surrounding the display area DA. In addition, although not shown in the drawing, the display device 500 may further include a housing (not shown) accommodating the display panel DP, the light source LS, and the optical substrate unit 100, and the display panel DP ) may be covered by the housing of the housing.

In this embodiment, the display panel DP may be an organic light emitting display panel. In this case, the display panel DP may include a plurality of pixels each including an organic light emitting diode disposed in the display area DA, and the display panel DP may include light output from the plurality of pixels. You can display an image using .

As described above, in this embodiment, the display panel DP is an organic light emitting display panel, but the present invention is not limited to the type of display panel DP. For example, in another embodiment, the display panel DP may be another type of display panel such as a liquid crystal display panel.

The light source LS is disposed adjacent to the display panel DP to generate light. In this embodiment, the light source LS may be located on one side of the display panel DP, and the light source LS may generate infrared rays. Therefore, it is possible to prevent the display quality of the display panel DP from deteriorating due to the infrared rays generated from the light source LS being mixed with the light generated from the plurality of pixels of the display panel DP.

In another embodiment, a plurality of light sources LS may be provided, and in this case, the plurality of light sources may be arranged along one side of the display panel DP.

A light emitting surface of the light source LS may face the light incident element 135 of the optical substrate unit 100 . In this embodiment, light emitted from the light source LS may be collimated light. Accordingly, the light emitted from the light source LS may be provided to the incident point LP defined in the light incident area A1 of the optical substrate unit 100 .

The optical substrate unit 100 covers the display panel DP. In this embodiment, a light incident area A1 and a light output area A2 are defined in the optical substrate unit 100 .

The optical substrate unit 100 receives light generated from the light source LS through a portion corresponding to the light incident area A1. In addition, the light moving from the light source LS to the optical substrate unit 100 is totally reflected inside the optical substrate unit 100, and the light totally reflected inside the optical substrate unit 100 when viewed on a plane is approximately It may progress within a range of the advance angle EA.

Meanwhile, the light totally reflected inside the optical substrate unit 100 is used to sense the user's biometric information, such as a fingerprint and a face, which are in contact with the optical substrate unit 100 . More specifically, when the user's fingerprint is in contact with the sensing area SA located within the light output area A2 of the optical substrate unit 100 while the light is totally reflected inside the optical substrate unit 100 A part of the light totally reflected inside the optical substrate unit 100 by the user's fingerprint is emitted to the outside of the optical substrate unit 100, and the other part of the total reflected light is incident toward the optical image sensor 200, and the user's Used for fingerprint sensing. This will be described in more detail with reference to FIG. 3 as follows.

FIG. 3 is a diagram illustrating a fingerprint sensing function of a display device with a built-in optical image sensor, FIG. 4A is an enlarged view of the optical filter element 300 shown in FIG. 3, and FIG. 4B is an optical filter element 300 and a cross-sectional view of the display panel DP.

Referring to FIGS. 3, 4A and 4B , the optical substrate unit 100 is coupled to the display panel DP to cover the display panel DP.

The optical substrate unit 100 includes a cover substrate 105, a decor layer 110, a first low refractive index layer 115, a high refractive index layer 120, a light guide film 130 and a second refractive layer 140. do.

The cover substrate 105 may have a light transmitting property, and may have a plate shape corresponding to the shape of the display panel DP. In this embodiment, the constituent material of the cover substrate 105 may include tempered glass. The cover substrate 105 may function as a window of the display device 500, and accordingly, the cover substrate 105 is disposed on the uppermost side of the display device 500 to cover and protect the display panel DP.

The decor layer 110 is disposed on the lower surface of the cover substrate 105 to correspond to the non-display area NDA of the display panel DP. The decor layer 110 may include a pattern representing a logo, trademark, or text identifying the display device 500 .

The first low refractive index layer 115 is disposed on the lower surface of the cover substrate 105, and the first low refractive index layer 115 is positioned between the cover substrate 105 and the display panel DP. In this embodiment, the first low refractive index layer 115 may cover the decor layer 110 .

The first low refractive index layer 115 may have a lower refractive index than each of the cover substrate 105 and the high refractive index layer 120 . For example, in this embodiment, the refractive index of each of the cover substrate 105 and the high refractive index layer 120 may be about 1.50, and the refractive index of the first refractive layer 115 may be about 1.41.

The high refractive index layer 120 is disposed on the lower surface of the first low refractive index layer 115 , and the high refractive index layer 120 faces the cover substrate 105 with the first low refractive index layer 115 interposed therebetween. As described above, the refractive index of the high refractive index layer 120 may be greater than that of the first low refractive index layer 115 .

Light incident to the inside of the optical substrate unit 100 may be totally reflected by the high refractive index layer 120 . More specifically, when light is incident toward the first low refractive index 115 through the high refractive index layer 120, the first low refractive index is caused by a difference in refractive index between the first low refractive index layer 115 and the high refractive index layer 120. Total reflection may occur at the boundary between the layer 115 and the high refractive index layer 120 .

The light guide film 130 faces the first low refractive index layer 115 with the high refractive index layer 120 therebetween. In this embodiment, the light guide film 130 includes a light emitting element 138 and a light entering element 135 . In addition, the refractive index of the light guide film 130 may be greater than that of the first low refractive index layer 120 , and the refractive index of the light guide film 130 may be substantially the same as that of the high refractive index layer 120 . Therefore, since there is substantially no difference in refractive index between the light guide film 130 and the high refractive index layer 120, total reflection does not occur at the boundary between the light guide film 130 and the high refractive index layer 120.

In this embodiment, the light guide film 130 may include a light input device 135 and a light output device 138 . The light input device 135 is positioned to face the light source LS corresponding to the non-display area NDA.

In this embodiment, the light receiving device 135 may include a holographic pattern to change the traveling directions of the first incident light L1 and the second incident light L11 provided from the light source LS. Accordingly, the first incident light L1 and the second incident light L11 whose traveling direction is changed by the light input device 135 are totally reflected inside the light guide film 130 and the high refractive index layer 120 .

The light emitting device 138 is positioned to correspond to the display area DA of the display panel DP. In this embodiment, the light emitting device 138 includes a holographic pattern to change the traveling direction of light that is totally reflected inside the light guide film 130 and the high refractive index layer 120, and the light emitting device 138 changes the traveling direction. The changed light is emitted to the outside of the light guide film 130 and the high refractive index layer 120 .

More specifically, after the traveling directions of the first incident light L1 and the second incident light L11 totally reflected inside the light guide film 130 and the high refractive index layer 120 are changed by the light emitting element 138, The first incident light L1 and the second incident light L11 exit the light guide film 130 and the high refractive index layer 120 and proceed toward the sensing area SA of the cover substrate 105 .

In this embodiment, the light emitting element 138 and the light receiving element 135 in the light guide film 130 may be positioned on the same plane. In terms of the manufacturing process, the area of the light emitting element 138 and the area of the light receiving element 135 are partitioned on one film, and a holographic pattern is formed in each area to form the light emitting element 138 and the light receiving element 135. A guide film 130 may be manufactured. In this case, after a master film having a pattern of light emitting elements 138 and another master film having a pattern of light entering elements 135 are disposed adjacent to each other, the light emitting element 138 and the light entering element are formed on one holographic recording film. The light guide film 130 may be manufactured by copying the holographic patterns corresponding to (135).

The second low refractive index layer 140 faces the high refractive index layer 120 with the light guide film 130 therebetween, and the second low refractive index layer 140 may be formed on the top surface of the display panel DP. . In this embodiment, the refractive index of the second low refractive index layer 140 may be smaller than the respective refractive indices of the high refractive index layer 120 and the light guide film 130, and the refractive index of the second low refractive index layer 140 is the first low refractive index layer 140. It may be substantially the same as the refractive index of the refractive layer 115 .

The function of sensing the user's fingerprint FR in the display device 500 having the above configuration will be described below.

As described above, the light generated from the light source LS is incident toward the light input device 135 to define the first incident light L1, and the first incident light L1 is formed by the light guide film 130 and the high refractive index layer 120. ) is totally reflected inside the

More specifically, since there is no difference between the refractive index of the high refractive index layer 120 and the refractive index of the light guide film 130, the first incident light L1 passes through the interface between the high refractive index layer 120 and the light guide film 130. In contrast, the first incident light L1 is totally reflected at the interface between the high refractive index layer 120 and the first low refractive index layer 115 due to the difference in the refractive index of the high refractive index layer 120 and the first low refractive index layer 115. , The first incident light L1 is reflected at the interface between the light guide film 130 and the second low refractive index layer 140 due to the difference between the refractive index of the light guide film 130 and the refractive index of the second low refractive index layer 140. .

While the first incident light L1 is totally reflected inside the high refractive index layer 120 and the light guide film 130, the traveling direction of the first incident light L1 is controlled by the light emitting element 138 of the light guide film 130. can be changed. As a result, after some of the first incident light L1 is emitted from the high refractive index layer 120 and the light guide film 130, the fingerprint FR of the user contacting the sensing area SA of the cover substrate 105 proceed to the side

Meanwhile, the fingerprint FR is implemented as a raised portion FR1 and a valley portion FR2, and the raised portion FR1 has a shape protruding more than the valley portion FR2. Therefore, when the fingerprint FR contacts the cover substrate 105, the raised portion FR1 contacts the cover substrate 105, but the valley portion FR2 does not contact the cover substrate 105.

Therefore, when the first incident light L1 reaches the raised portion FR1, the first incident light L1 is refracted by the raised portion FR1 to define the refracted light L2, and the refracted light L2 is displayed. It is emitted to the outside of the device 500.

Meanwhile, the second incident light L11 that is totally reflected inside the light guide film 130 and the high refractive index layer 120 is defined through a different light path from the aforementioned first incident light L1. While the second incident light L11 is totally reflected inside the high refractive index layer 120 and the light guide film 130, the traveling direction of the second incident light L11 is controlled by the light emitting element 138 of the light guide film 130. can be changed. As a result, after some of the second incident light L11 is emitted from the high refractive index layer 120 and the light guide film 130, the fingerprint FR of the user contacting the sensing area SA of the cover substrate 105 It may proceed to the side of the valley FR2.

As described above, since the valley FR2 of the fingerprint FR does not contact the cover substrate 105 , the second incident light L11 may not substantially reach the valley FR2 . On the other hand, since the cover substrate 105 is in contact with the air layer having a refractive index of 1, unlike the first incident light L1, the second incident light L11 is transmitted through the cover substrate 105 due to the difference in refractive index between the cover substrate 105 and the air layer. and total reflection at the interface between the air layers.

Meanwhile, the second incident light L11 totally reflected at the interface between the cover substrate 105 and the air layer may be incident to the optical image sensor 200 to define the sensing light L22. The sensing light L22 is used to sense the user's fingerprint FR in the optical image sensor 200, so that an image of the fingerprint FR can be generated by the optical image sensor 200.

The optical filter element 300 covers the optical image sensor 200 . 2 and 3, the optical substrate unit 100 is disposed above the display panel DP, and the optical filter element 300 is disposed below the display panel DP. 300 is disposed between the display panel DP and the optical image sensor 200 .

In this embodiment, the optical filter element 300 includes a plurality of light absorbing parts 301 and a plurality of light transmitting parts 306, and in the optical filter element 300, a plurality of light absorbing parts 301 and a plurality of light absorbing parts 301 and a plurality of light absorbing parts 301 The light transmission parts 306 of are alternately arranged with each other.

When viewed in cross section, each of the plurality of light absorbing portions 301 and each of the plurality of light transmitting portions 306 extend in a direction inclined with respect to the display panel DP or the first base substrate (BS in FIG. 5). do. When viewed in cross section, the inclined direction in which each of the plurality of light absorbing parts 301 extends is the same as the inclined direction in which each of the plurality of light transmitting parts 306 extends.

In addition, if the meaning that certain two elements overlap on the cross section throughout the specification is defined as the overlapping of the two elements in the direction perpendicular to the direction in which the cross section was taken, two light absorbing parts adjacent to each other when viewed in cross section One of the upper ends P1 may overlap at least a portion of the other lower end P2.

In this embodiment, the constituent material of the plurality of light absorbing parts 301 may include a material that absorbs light, for example, resin mixed with carbon, and each of the plurality of light transmitting parts 306 is an optical filter element. It can be defined as a through hole defined in (300). Therefore, in terms of the manufacturing method, a light absorbing layer containing a material that absorbs light is formed, and a plurality of light absorbing portions 301 and a plurality of through holes are formed to be spaced apart from each other in an inclined direction in the light absorbing layer. An optical filter element 300 having light transmission portions 306 of , can be easily formed.

As described above, in this embodiment, each of the plurality of light penetrating parts 306 may be defined as a through hole formed in the optical filter element 300, but in other embodiments, the plurality of light penetrating parts 306 are composed of materials. The plurality of light-transmitting parts 306 may have light-transmitting properties by including a silver light-transmitting material, for example, transparent resin.

According to the structure of the plurality of light absorbing parts 301 and the plurality of light transmitting parts 306 described above, the light filter element 300 may have a filtering function of transmitting or absorbing light according to the traveling direction of light. there is. Accordingly, as the light passes through the optical filter element 300, a collimated effect may be generated for the light. In other words, when light is incident on the optical filter element 300 at approximately the incident angle LA, the light can pass through the optical filter element 300, and the light can pass through the optical filter element 300 beyond the incident angle LA. When incident on the element 300 , the light may be absorbed by the optical filter element 300 .

Meanwhile, the value of the incident angle LA at which the sensing light L22 is incident on the optical image sensor 200 according to positions of the light source LS, the light entering device 135, the light emitting device 138, and the sensing area SA. this can be calculated. Therefore, when the light absorbing parts 301 of the optical filter element 300 are designed to correspond to the calculated incident angle LA, most of the sensing light L22 passes through the optical filter element 300 to form an optical image. The sensor 200 can be reached.

On the other hand, light incident to the optical filter element 300 outside the incident angle LA is highly likely to be absorbed by the optical filter element 300 . For example, when the incident angle LA of the sensing light L22 is designed to be about 45 degrees, the external light LT provided from the outside of the optical substrate unit 100 corresponds to the incident angle LA of the sensing light L22. It may be incident on the optical filter element 300 at a smaller angle. As a result, the amount of light of the external light LT may be greater than the amount of light of the sensing light L22 absorbed by the optical filter element 300 .

Also, if it is defined that the sensing light L22 shown in FIG. 3 is incident to the optical filter element 300 with a positive slope value, some of the external light LT shown in FIG. 5 has a negative slope value and is incident to the optical filter element 300. It may be incident on the device 300 . In this case, since the traveling direction of the external light LT incident on the optical filter element 300 with a negative slope is opposite to the inclined direction of the light absorbing portions 301, most of the external light LT is light. It can be absorbed by the filter element 300.

Meanwhile, according to the optical filter element 300 having the above-described optical characteristics, the proportion occupied by the external light LT in the total amount of light incident to the optical image sensor 200 may be reduced, and the proportion occupied by the sensing light L22 can increase Therefore, since the light amount of the external light LT irrespective of the sensing of the user's fingerprint FR incident on the optical image sensor 200 may be reduced, the user's fingerprint generated by the optical image sensor 200 ( FR) can improve the sharpness of the image.

In this embodiment, the optical image sensor 200 and the optical filter element 300 may be coupled to the rear surface of the first base substrate BS1 in the form of a fingerprint sensing module 400 . In another embodiment, the optical image sensor 200 and the optical filter element 300 may be embedded inside the display panel DP.

5 is a cross-sectional view of a display device 501 with a built-in optical image sensor according to another embodiment of the present invention.

More specifically, in FIG. 5 , a cross section of the optical image sensor built-in display device 501 (hereinafter referred to as “display device”) is shown so that the cross section of the optical image sensor 200 of the display panel DP1 is shown. Meanwhile, in the description of FIG. 5 , reference numerals are added to the components described above, and redundant descriptions of the components are omitted.

Referring to FIG. 5 , the display device 501 includes a display panel DP1 and an optical substrate unit 100 . The optical substrate unit 100 according to this embodiment may have the same structure as the optical substrate unit (100 in FIG. 2 ) previously described with reference to FIGS. 1 to 3 .

In this embodiment, the display panel DP1 may be an organic light emitting display panel. The display panel DP1 may include a plurality of pixels disposed on the first base substrate BS1, and in FIG. 5, some of the plurality of pixels are illustrated as an example. The present invention is not limited to the structure of pixels, and the structure of pixels according to this embodiment will be described below.

In this embodiment, the first base substrate BS1 may be a plastic substrate. More specifically, the first base substrate BS1 may be implemented as a polyimide (PI) film. In another embodiment, the first base substrate BS1 may be a glass substrate or a metal substrate.

A first insulating layer 10 is disposed on the first base substrate BS1. The first insulating layer 10 may function as a buffer layer, and the first insulating layer 10 covers the first base substrate BS1 to block impurities diffused from the first base substrate BS1.

The driving transistor TR is disposed on the first insulating layer L1. The driving transistor TR may be electrically connected to a switching transistor (not shown), and the driving transistor TR may be turned on by a switching operation of the switching transistor.

In this embodiment, the driving transistor TR includes an active pattern AP, a gate electrode GE, a source electrode SE, and a drain electrode DE. In this embodiment, the driving transistor TR may have a top-gate structure.

The active pattern AP is disposed on the first insulating layer L1, and a material of the active pattern AP includes a semiconductor material. In this embodiment, a constituent material of the active pattern AP may include polycrystalline silicon. However, the present invention is not limited to the material of the active pattern AP. For example, in another embodiment, the constituent material of the active pattern AP is an oxide semiconductor such as IGZO, ZnO, SnO ₂ , In ₂ O ₃ , Zn ₂ SnO ₄ , Ge ₂ O ₃ and HfO ₂ In another embodiment, the constituent material of the active pattern AP may include compound semiconductors such as GsAs, GaP, and InP.

The second insulating layer 20 covers the active pattern AP, and when viewed in cross section, the gate electrode GE is disposed on the second insulating layer 20 and overlaps the active pattern AP. The second insulating layer 20 may function as a gate insulating layer by being interposed between the gate electrode GE and the active pattern AP.

The third insulating layer 30 covers the gate electrode GE. In this embodiment, the third insulating layer 30 may be an organic layer, and the third insulating layer 30 flattens a step formed by the active pattern AP and the gate electrode GE.

The source electrode SE is in contact with the source region of the active pattern AP through a contact hole defined in the third insulating layer 30 . In addition, the drain electrode DE is spaced apart from the source electrode SE, and the drain electrode DE contacts the drain region of the active pattern AP through another contact hole defined in the third insulating layer 30 .

The fourth insulating layer 40 and the fifth insulating layer 50 are sequentially stacked on the source electrode SE and the drain electrode DE to cover the source electrode SE and the drain electrode DE. In addition, a contact hole is formed in each of the fourth insulating film 40 and the fifth insulating film 50 corresponding to the location of the drain electrode DE, and the organic light emitting diode is formed in the fourth insulating film 40 and the fifth insulating film 50 . ) is electrically connected to the drain electrode DE through the contact hole.

The organic light emitting diode includes an anode E1, an organic light emitting layer EML, and a cathode CE. The anode E1 contacts the drain electrode DE, the organic light emitting layer EML is disposed on the anode E1, and the cathode CE is disposed on the organic light emitting layer EML.

The anode E1 makes contact with the drain electrode DE through contact holes formed in the fourth insulating film 40 and the fifth insulating film 50 . In this embodiment, the anode E1 may be a reflective electrode, and the constituent material of the first electrode E1 may include a metal material such as aluminum.

The organic light emitting layer EML may contact the anode E1 through an opening formed in the bank layer 60 disposed on the fifth insulating layer 50 . In this embodiment, the organic light emitting layer EML may emit white light, and the white light may be filtered into color light by the color filter CF. In another embodiment, the organic light emitting layer EML may emit color light, and in this case, the color filter CF as a component of the display panel DP1 may be omitted.

The cathode CE is disposed on the organic light emitting layer EML. In this embodiment, the cathode CE may be a transmissive electrode or a transflective electrode, and the constituent materials of the cathode CE include indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), and ITZO ( It may include a transparent conductive material such as indium tin zinc oxide). Therefore, among the light emitted from the organic light emitting layer EML, the light reaching the anode E1 is reflected by the anode E1 and then emitted to the outside of the display panel DP1 through the cathode CE. ) may display an image in a top emission type method.

An inorganic encapsulation film 80 and an organic encapsulation film 90 may be disposed on the cathode CE. The inorganic encapsulation film 80 and the organic encapsulation film 90 block moisture and gas that may flow into the organic light emitting layer (EML). Accordingly, deterioration of the organic light emitting layer EML by moisture and gas may be prevented by the inorganic encapsulation film 80 and the organic encapsulation film 90 .

A second base substrate BS2 on which color filters CF and black matrices BM are formed may be disposed on the inorganic encapsulation film 80 and the organic encapsulation film 90 . The second base substrate BS2 may be a plastic substrate. More specifically, the second base substrate BS2 may be implemented as a polyimide (PI) film.

In this embodiment, the color filters CF may include a red filter, a blue filter, and a green filter, and when viewed in cross section, each of the color filters CF overlaps the anode E1 to form the organic light emitting layer EML. ) to filter the color light from the white light emitted from the filter.

The black matrices BM may be formed of resin mixed with carbon, and each of the black matrices BM is disposed between two corresponding color filters among the color filters CF to form the organic light emitting layer EML. absorbs light emitted from

As described above, in this embodiment, the second base substrate BS2 on which the color filters CF and the black matrix BM are formed is disposed on the inorganic encapsulation film 80 and the organic encapsulation film 90. In the example, the second base substrate BS2 may be omitted as a component of the display panel DP, and in this case, the color filters CF and the black matrix BM are used to form the inorganic encapsulation film 80 and the organic encapsulation film. (90) may be placed on top. In another embodiment, when the organic light emitting layer EML includes an organic light emitting material that emits color light, the color filters CF as a component of the display panel DP may be omitted.

In this embodiment, the display panel DP1 includes the optical image sensor 200 and the first light absorption pattern PT1.

The optical image sensor 200 is disposed on the first base substrate BS1. More specifically, the optical image sensor 200 is disposed on the rear surface of the first base substrate BS1, and the optical image sensor 200 is mounted on the optical substrate unit 100 with the first base substrate BS1 therebetween. confront

In this embodiment, as described with reference to FIGS. 1 to 3 , the optical image sensor 200 receives the sensing light L22 provided from the optical substrate unit 100 to detect a living body such as a user's fingerprint or face. sense information.

In this embodiment, the first light absorption pattern PT1 is disposed between the first base substrate BS1 and the optical image sensor 200 . The first light absorbing pattern PT1 includes a plurality of light absorbing elements 5, 6, and 7, and the plurality of light absorbing elements 5, 6, and 7 are mixed with a material that absorbs light, for example, carbon. resin may be included.

In this embodiment, the plurality of light absorbing elements 5, 6 and 7 are spaced apart from each other. Accordingly, a first slit ST1 may be defined between two adjacent light absorbing elements 5 , 6 , and 7 among the plurality of light absorbing elements 5 , 6 , and 7 .

In this embodiment, the plurality of light absorbing elements 5, 6, and 7 may be arranged alternately with the plurality of anodes E1, E1-1, and E1-2. In this embodiment, the meaning that the plurality of light absorbing elements 5, 6, and 7 are staggered with the plurality of anodes E1, E1-1, and E1-2 can be defined as follows.

5, the plurality of anodes (E1, E1-1, E1-2) are arranged from left to right in order of first anode (E1), second anode (E1-1) and second anode (E1-1). It is defined as 3 anodes (E1-2), and a plurality of light absorbing elements (5, 6, 7) are arranged from left to right in the order of the first light absorbing element (5), the second light absorbing element (6) and the third light absorbing element (5). It is defined as a light absorbing element (7). In this case, when viewed in cross section, between the first and second anodes E1 and E1-1 overlaps the second light absorbing element 6, and when viewed in cross section, the second and third anodes E1-1 are overlapped. 1, E1-2) overlaps with the third light absorbing element 7.

In addition, when viewed in cross section, a slit defined between two light absorbing elements adjacent to each other among the first to third light absorbing elements 5, 6, and 7 is a plurality of anodes E1, E1-1, and E1-2 overlap with any one of them. For example, if the first slit ST1 is defined between the second light absorbing element 6 and the third light absorbing element 7, when viewed in cross section, the first slit ST1 is the second anode E1-1 overlaps with

According to the configuration described above, as described above with reference to FIG. 3 , when the incident angle (LA in FIG. 3 ) of the sensing light L22 is set, the sensing light L22 having the set incident angle is the first light absorption pattern. The slits may be designed to pass through the slits of (PT1). In this case, the amount of light of the sensing light L22 passing through the first light absorption pattern PT1 is greater than the amount of external light LT passing through the first light absorption pattern PT1, and the first light absorption pattern ( The amount of light of the external light LT absorbed by the first light absorption pattern PT1 is greater than the amount of light of the sensing light L22 absorbed by PT1).

Accordingly, the proportion occupied by the external light LT in the total amount of light incident toward the optical image sensor 200 by the first light absorption pattern PT1 may be reduced, and the proportion occupied by the sensing light L22 may be increased. . As a result, since the amount of external light LT irrelevant to the sensing of the user's fingerprint (FR in FIG. 3 ) incident on the optical image sensor 200 may be reduced, The sharpness of the image of the user's fingerprint (FR in FIG. 3) can be improved.

6 is a cross-sectional view of a display device 502 with a built-in optical image sensor according to another embodiment of the present invention. Meanwhile, in the description of FIG. 6 , reference numerals are used for the components described above, and redundant descriptions of the components are omitted.

Referring to FIG. 6 , the optical image sensor built-in display device 502 (hereinafter referred to as 'display device') includes a display panel DP2 and an optical substrate unit 100 .

Comparing the structure of the display device (501 in FIG. 5) shown in FIG. 5 and the display device 502 shown in FIG. 6, the display device 502 according to this embodiment has a second light absorption pattern ( PT2) is further included. That is, in this embodiment, the first light absorption pattern PT1 located on the lower surface of the first base substrate BS1 and the second light absorption pattern PT2 located on the upper surface of the first base substrate BS1 are used. External light LT is filtered.

The first light absorption pattern PT1 is disposed between the optical image sensor 200 and the first base substrate BS1, and the second light absorption pattern PT2 is disposed with the first base substrate BS1 therebetween. 1 opposes the light absorption pattern PT1.

In this embodiment, the second light absorption pattern PT2 includes a plurality of light absorption elements 8, 8-1, and 8-2, and the plurality of light absorption elements 8, 8-1, and 8-2 A material that absorbs light, for example, a resin mixed with carbon may be included.

In this embodiment, the plurality of light absorbing elements 5, 6, and 7 of the first light absorption pattern PT1 are the plurality of light absorbing elements 8, 8-1, 8- of the second light absorption pattern PT2. 2) and are staggered. In addition, the plurality of light absorption elements 8, 8-1, and 8-2 of the second light absorption pattern PT2 are alternately disposed with the plurality of anodes E1, E1-1, and E1-2. Therefore, when viewed in cross section, two slits adjacent to each other among the plurality of light absorption elements 5, 6, and 7 of the first light absorption pattern PT1 are the plurality of light absorption elements 8 of the second light absorption pattern PT2. ,8-1,8-2) overlaps with any one of them.

For example, the plurality of light absorbing elements 5, 6, and 7 of the first light absorption pattern PT1 are arranged from left to right in order of first light absorbing element 5, second light absorbing element 6 and It is defined as the third light absorbing element 7, and the plurality of light absorbing elements 8, 8-1, 8-2 of the second light absorbing pattern PT2 are arranged from left to right in order of fourth light absorbing element ( 8), when defined as the fifth light absorbing element 8-1 and the sixth light absorbing element 8-2, the first slit defined between the second and third light absorbing elements 6 and 7 when viewed in cross section (ST1) overlaps with the sixth light absorbing element 8-2. In addition, when viewed in cross section, the second slit ST2 defined between the fifth and sixth light absorbing elements 8-1 and 8-2 overlaps the second light absorbing element 6.

In addition, the plurality of anodes (E1, E1-1, E1-2) are arranged from left to right in order of first anode (E1), second anode (E1-1) and third anode (E1-2) When defined as, when viewed in cross section, between the first and second anodes E1 and E1-1 overlaps with the fifth light absorbing element 8-1, and when viewed in cross section, the second and third anodes ( The space between E1-1 and E1-2) overlaps with the sixth light absorbing element 8-2.

According to the configuration described above, as described above with reference to FIG. 3, the incident angle (LA in FIG. 3) of the sensing light L22 is set in advance, and the sensing light L22 having the set incident angle absorbs the first light. Slits may be designed to pass through the slits of the pattern PT1 and the second light absorption pattern PT2. In this case, the amount of external light LT passing through the first and second light absorption patterns PT1 and PT2 is greater than the sensing light L22 passing through the first and second light absorption patterns PT1 and PT2. ) has a large amount of light.

Therefore, the portion occupied by the external light LT in the total amount of light incident toward the optical image sensor 200 by the first and second light absorption patterns PT1 and PT2 may be reduced, and the portion occupied by the sensing light L22 may be reduced. proportion may increase. As a result, since the amount of external light LT irrelevant to the sensing of the user's fingerprint (FR in FIG. 3 ) incident on the optical image sensor 200 may be reduced, The sharpness of the image of the user's fingerprint (FR in FIG. 3) can be improved.

Although described with reference to the above embodiments, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the scope of the claims below. You will understand.

100: optical board unit DP: display panel
PT1: first light absorption pattern PT2: second light absorption pattern
200: optical image sensor 300: optical filter element
FR: fingerprint 105: cover substrate
110: decor layer 115: first low refractive index layer
120: high refractive index layer 130: light guide film
140: second low refractive index layer 400: fingerprint sensing module

Claims (19)

display panel;
a light source disposed adjacent to the display panel; and
An optical substrate unit having a sensing area defined therein to cover the display panel and guiding light provided from the light source toward the sensing area;
The display panel,
base substrate;
pixels disposed on the base substrate;
an optical image sensor disposed on the base substrate and sensing biometric information of a user who is in contact with the sensing area using light guided by the optical substrate unit; and
An optical filter element covering the optical image sensor and including a light absorbing part and a light transmitting part each extending in a direction inclined with respect to the base substrate when viewed in cross section;
The optical substrate unit,
a cover substrate covering the display panel;
a first low refractive index layer disposed between the cover substrate and the display panel and having a refractive index smaller than that of the cover substrate;
a high refractive index layer facing the cover substrate with the first low refractive index layer therebetween and having a higher refractive index than the first low refractive index layer;
a light guide film facing the first low refractive index layer with the high refractive index layer interposed therebetween; and
and a second low refractive index layer facing the high refractive index layer with the light guide film interposed therebetween and having a refractive index smaller than each of the high refractive index layer and the light guide film.
The optical image sensor of claim 1, wherein each of the light absorbing part and the light transmitting part is provided in plurality, and in the optical filter element, the plurality of light absorbing parts and the light transmitting part are alternately arranged with each other. Built-in display. 3. The display device according to claim 2, wherein an upper end of one of the two light absorbing parts adjacent to each other overlaps at least a part of a lower end of the other. 3. The display device according to claim 2, wherein when viewed from a cross-sectional view, an inclined direction in which each of the plurality of light absorbing parts extends is the same as an inclined direction in which each of the plurality of light transmitting parts extends. The display device according to claim 1, wherein the light transmission part is defined as a through hole formed in the light filter element in a direction inclined with respect to the base substrate. The method of claim 1, wherein the optical image sensor faces the optical substrate unit with the base substrate interposed therebetween, the optical filter element is positioned between the base substrate and the optical image sensor, and the optical filter element is positioned between the base substrate and the optical image sensor. An optical image sensor embedded display device, characterized in that in direct contact with the base substrate.
delete The method of claim 1, wherein the light guide film,
a light emitting element positioned corresponding to the display area of the display panel and emitting light totally reflected inside the light guide film to the outside; and
and a light receiving element positioned corresponding to the non-display area of the display panel and guiding the light provided from the light source to the light emitting element. The display device with a built-in optical image sensor according to claim 1, wherein the light source generates infrared rays. display panel;
a light source disposed adjacent to the display panel; and
A sensing area for sensing biometric information is defined to cover the display panel and includes an optical substrate unit for guiding light provided from the light source to the sensing area,
The display panel,
base substrate;
pixels disposed on the base substrate;
an optical image sensor disposed on the base substrate and sensing the biometric information using light guided by the optical substrate unit; and
A first light absorption pattern disposed on the base substrate and positioned between the optical substrate unit and the optical image sensor;
The pixels include a plurality of organic light emitting diodes, the organic light emitting diodes include an anode, an organic light emitting layer in contact with the anode, and a cathode on the organic light emitting layer, the anode is plural, and the first light absorption pattern is A display device with a built-in optical image sensor, characterized in that it comprises a plurality of first light absorbing elements spaced apart from each other and arranged alternately with the plurality of anodes. 11. The display device according to claim 10, wherein a space between two adjacent anodes among the plurality of anodes overlaps one of the plurality of first light absorbing elements. 11. The built-in optical image sensor according to claim 10, wherein a plurality of first slits are defined in the first light absorption pattern, and each of the plurality of anodes overlaps one of the plurality of first slits. display device. 11. The method of claim 10, wherein the display panel,
Further comprising a second light absorption pattern disposed on the base substrate to face the first light absorption pattern with the base substrate interposed therebetween;
The second light absorption pattern,
A display device with a built-in optical image sensor comprising: a plurality of second light absorbing elements spaced apart from each other and arranged alternately with the plurality of first light absorbing elements. 14. The method of claim 13, wherein a plurality of first slits are defined in the first light absorption pattern, a plurality of second slits are defined in the second light absorption pattern, and each of the first light absorption elements is defined in the plurality of first light absorption elements. The display device with built-in optical image sensor, characterized in that it overlaps with any one of the 2 slits, and each of the second light absorbing elements overlaps with any one of the plurality of first slits. The method of claim 10, wherein the optical substrate unit,
a cover substrate covering the display panel;
a first low refractive index layer disposed between the cover substrate and the display panel;
a high refractive index layer facing the cover substrate with the first low refractive index layer therebetween and having a higher refractive index than the first low refractive index layer;
a light guide film facing the first low refractive index layer with the high refractive index layer interposed therebetween;
a second low refractive layer facing the high refractive layer with the light guide film interposed therebetween and having a refractive index smaller than each of the high refractive layer and the light guide film;
The light guide film,
a light emitting element positioned corresponding to the display area of the display panel and emitting light totally reflected inside the light guide film to the outside; and
and a light receiving element positioned corresponding to the non-display area of the display panel and guiding the light provided from the light source to the light emitting element.
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