TW202115469A - Display device - Google Patents

Abstract

A display device according to an exemplary embodiment of the present invention includes: a display panel or the substrate; a fingerprint sensor disposed on a first side of the display panel or the substrate and includes a frame and a sensing portion disposed in the frame; and an adhesive bonding the fingerprint sensor to the display panel or the substrate by contacting an outer side of the frame and the first side of the display panel or the substrate, wherein a refractive pattern corresponding to an appropriate height of the adhesive is formed at the outer side of the frame, and a height of a portion where the adhesive contacts the frame is higher than or equal to a height of the refractive pattern.

Description

Display device

The embodiment of the present invention relates to a display device. Specifically, the present invention relates to a display device including a fingerprint sensor.

Commercially available biometric technology uses personal security features for personal security systems. Fingerprint recognition, iris recognition, face recognition, and vein recognition are examples of this type of biometric technology.

Fingerprint recognition uses a fingerprint sensor capable of recognizing human fingerprints, for example. The fingerprint sensor uses electrostatic methods to identify the electric field flowing through the human body based on the curvature of the fingerprint; optical methods to obtain fingerprint images reflected by visible light; and ultrasonic methods to obtain fingerprint images using ultrasound.

The fingerprint sensor is attached to a display device, such as a smart phone, and can be used to lock the display device and mobile payment.

The above-mentioned information disclosed in the prior art section is only used to strengthen the understanding of the technical background of the present invention, and therefore may include information that does not constitute the prior art known to those with ordinary knowledge in the field in the country.

In the process of attaching the fingerprint sensor to the display device, an adhesive such as resin is applied to fix the fingerprint sensor to the display device. In order to fix the fingerprint sensor, the adhesive must be applied to an appropriate height. When the applied adhesive is lower than the proper height, the adhesive force of the fingerprint sensor may be weakened, and when the applied adhesive is higher than the proper height, the adhesive may be wasted. Therefore, in the process of attaching the fingerprint sensor to the display device, it is necessary to check whether the adhesive is applied to an appropriate height. When the height of the adhesive is directly measured before the adhesive is cured, the fingerprint sensor may be touched, resulting in poor adhesion of the fingerprint sensor. In order to avoid contact with the fingerprint sensor, a non-contact method such as laser measurement may be used. However, due to the scattering of light from the display panel, the exact height of the adhesive cannot be measured.

The method of the present invention to solve the technical problem is to provide a display device that can easily check whether the adhesive is applied to an appropriate height in the process of attaching the fingerprint sensor to the display device, and can enhance the fingerprint sensor Of adhesion.

A display device according to an exemplary embodiment of the present invention includes: a display panel or a substrate; a fingerprint sensor disposed on the first side surface of the display panel or the substrate, and including a frame and a sensing part disposed in the frame; and an adhesive , By contacting the outer side of the frame and the first side surface of the display panel or substrate to bond the fingerprint sensor to the display panel or substrate; wherein a refractive pattern corresponding to an appropriate height of the adhesive is formed on the outer side of the frame, and the adhesive and The height of the part contacted by the frame is higher than or equal to the height of the refraction pattern.

The refraction pattern may include steps formed on the outside of the frame.

The height of the step is the distance from the first side of the display panel or the substrate to the step, and it may correspond to an appropriate height of the adhesive.

The height of the part where the adhesive contacts the frame may be equal to or higher than the height of the step.

The refraction pattern may include inclined sides formed on the outside of the frame.

The height of the inclined side surface is the distance from the first side surface of the display panel or the substrate to the highest part of the inclined side surface, and it may correspond to an appropriate height of the adhesive.

The height of the part where the adhesive contacts the frame may be equal to or higher than the height of the inclined side surface.

The refraction pattern may include grooves formed on the outside of the frame.

The height of the groove is the distance from the first side surface of the display panel or the substrate to the highest part of the groove, and it may correspond to an appropriate height of the adhesive.

The height of the part where the adhesive contacts the frame may be equal to or higher than the height of the groove.

A display device according to another embodiment of the present invention includes: a display panel; a back substrate facing the display panel; a fingerprint sensor, arranged on the first side of the back substrate, and including a frame, a sensing part arranged in the frame, and a connection To the base substrate of the sensing part; and the adhesive, which connects the fingerprint sensor to the back substrate by contacting the outside of the frame, the side of the back substrate, and the first side of the back substrate; wherein, the thickness corresponding to the appropriate height of the adhesive The refraction pattern is formed on the outer side of the frame, and the height of the part where the adhesive contacts the outer side of the frame and the side surface of the back substrate is higher than or equal to the height of the refraction pattern.

The refraction pattern may include steps formed on the outside of the frame.

The height of the step is the distance from the first side of the display panel to the step, and it may correspond to an appropriate height of the adhesive.

The height of the part where the adhesive contacts the outer side of the frame and the side surface of the base substrate may be equal to or higher than the height of the step.

The refraction pattern may include inclined sides formed on the outside of the frame.

The height of the inclined side surface is the distance from the first side surface of the display panel to the highest part of the inclined side surface, and it may correspond to an appropriate height of the adhesive.

The height of the part where the adhesive contacts the outer side of the frame and the side surface of the base substrate may be equal to or higher than the height of the inclined side surface.

The refraction pattern may include grooves formed on the outside of the frame.

The height of the groove is the distance from the first side surface of the display panel to the highest part of the groove, and it may correspond to an appropriate height of the adhesive.

The height of the part where the adhesive contacts the outer side of the frame and the side surface of the base substrate may be equal to or higher than the height of the groove.

In the process of joining the fingerprint sensor to the display device, it can easily check whether the adhesive is applied to a proper height, and it can improve production efficiency by shortening the test time of the fingerprint sensor. In addition, it can strengthen the adhesion of the fingerprint sensor

Hereinafter, the embodiments of the present invention will be explained more fully with reference to the accompanying drawings showing exemplary embodiments of the present invention. Those with ordinary knowledge in the art should understand that the described embodiments can be modified in many different ways, and all modifications do not depart from the spirit or scope of the present invention.

Further, in the exemplary embodiment, since similar element symbols indicate similar elements having the same configuration, after the first exemplary embodiment has been representatively described, in other exemplary embodiments, only the first exemplary embodiment will be described. A different configuration of an exemplary embodiment.

In order to clearly describe the present invention, parts irrelevant to the description will be omitted, and the same or similar constituent elements will be represented by the same element symbols throughout the specification.

The size and thickness of each component shown in the drawings can be arbitrarily shown for understanding and ease of description, and the present invention is not limited thereto. For clarity, the thickness of layers, films, panels, regions, etc. in the drawings may be exaggerated. In addition, for better understanding and ease of description, the thickness of most layers and regions can be exaggerated.

It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may be present. Conversely, when an element is said to be "directly" on" another element, there may be no intermediate elements. Further, when an element is referred to as being "on" or "above" on the reference element, it means that it is located above or below the reference element, and does not necessarily mean that it is located in the direction opposite to the direction of gravity. Above.

In addition, unless explicitly stated to the contrary, the term "comprise" and variants such as "comprises" or "comprising" will be understood to be intended to include the listed elements, but Do not exclude any other components.

Further, throughout the specification, the term "on a plane" means viewing the target part from the top, and the term "on a cross-sectional view" means cutting in the vertical direction when viewed from the side. Cut the cross section of the target part.

First, referring to FIG. 1 and FIG. 2, a display device according to an exemplary embodiment will be described.

FIG. 1 is a schematic top view of a display device including a fingerprint sensor according to an exemplary embodiment. Fig. 2 is a cross-sectional view of a state in which a fingerprint sensor is attached to a display panel according to an exemplary embodiment.

Referring to FIG. 1, the display device includes a display panel 100, a fingerprint sensor 200 and an adhesive 300.

The display panel 100 includes a plurality of pixels and displays an image. The display panel 100 may include a touch sensor, which includes a plurality of touch electrodes to sense a user's contact touch or non-contact touch. The display panel 100 may be flexible or rigid. The display panel 100 includes a flat surface, and may partially include a curved surface. Hereinafter, the display panel 100 will be exemplarily explained as being formed as a plane.

The fingerprint sensor 200 may be attached to the lower part of the display panel 100 through the adhesive 300. In Figure 1, the fingerprint sensor 200 is shown as a quadrilateral on a plane, but the planar shape of the fingerprint sensor is not limited to this.

The adhesive 300 is arranged to surround the fingerprint sensor 200 on a plane, and thus can fix the fingerprint sensor 200 to the display panel 100. In Figure 1, the adhesive 300 penetrates all sides surrounding the fingerprint sensor 200 to contact the fingerprint sensor 200, but according to an exemplary embodiment, the adhesive 300 may only contact a part of the fingerprint sensor 200. For example, the adhesive 300 may be arranged to contact three sides or two sides of the fingerprint sensor 200. As a non-limiting example, in addition to an adhesive having a certain viscosity, the adhesive 300 may further include a resin, such as optically clear resin (OCR), optically clear adhesive (OCA), liquid Liquid epoxy-based adhesive, liquid acryl-based adhesive and the like.

Referring to FIG. 2, the display panel 100 includes a first side surface 100a and a second side surface 100b opposite to the first side surface 100a. The first side surface 100a may be the rear side of the display panel 100, and the second side surface 100b may be the front side of the display panel 100 displaying images. The first side surface 100a is the side surface where the fingerprint sensor 200 is attached, and the second side surface 100b may be the side surface where an object such as a fingerprint contacts. The fingerprint sensor 200 is disposed on the first side surface 100 a of the display panel 100.

The fingerprint sensor 200 includes a frame 210, a sensing portion 220 and a base substrate 230. The frame 210 may have a structure to support the sensing part 220 by surrounding the side surface of the sensing part 220. The sensing part 220 is disposed inside the frame 210, and the sensing part 220 includes at least one constituent element capable of recognizing fingerprints of electrostatic type, optical type, ultrasonic type, etc., and the constituent elements of the sensing part 220 are not limited thereto. The base substrate 230 may be electrically connected to the sensing part 220. For example, the base substrate 230 may include at least one component element that reads and/or controls the signal sensed by the sensing part 220, and may include a printed circuit board (PCB) or a flexible printed circuit board (flexible printed circuit board). printed circuit board, FPCB). The base substrate 230 may be disposed on the frame 210.

The height h2 of the frame 210 from the first side surface 100a of the display panel 100 may be higher than the height of the sensing part 220, and the air layer AL may be disposed between the sensing part 220 and the first side surface 100a of the display panel 100. The sensing part 220 may be separated from the display panel 100 by an air layer AL. According to an exemplary embodiment, the air layer AL may be filled with a transparent material having a predetermined refractive index.

The frame 210 may include a step 211 formed on the outside. The height h1 of the step 211 may correspond to an appropriate height of the adhesive 300 provided to fix the fingerprint sensor 200. The height h1 of the step 211 is the distance from the first side surface 100 a of the display panel 100 to the step 211. The appropriate height of the adhesive 300 may be a height that meets the adhesive requirements of the fingerprint sensor 200. That is, the step 211 is formed on the outer side of the frame 210 as a refraction pattern corresponding to an appropriate height of the adhesive 300.

The height h2 of the frame 210 may be higher than an appropriate height of the adhesive 300, and the height h1 of the step 211 may be lower than the height h2 of the frame 210. The height h1 of the step 211 may be approximately 70% or higher of the height h2 of the frame 210. Alternatively, the height h1 of the step 211 may be approximately 450 μm or higher. That is, the appropriate height of the adhesive 300 for fixing the fingerprint sensor 200 may be about 70% or more of the height h2 of the frame 210, or may be about 450 μm or more.

The lower part of the wall structure of the frame 210 has a first width W1, and the upper part of the wall structure may have a second width W2 smaller than the first width W1. Here, the lower part of the wall structure means a part lower than the height h1 of the step 211, and the upper part of the wall structure means a part higher than the height h1 of the step 211. The step 211 may have a shape in which the upper portion is cut into a third width W3 from the outside of the wall structure, and the third width W3 is smaller than the first width W1. The upper part of the wall structure may have a second width W2 inside the touch sensing portion 220 and the step 211.

In Figure 2, it is shown that the inner side of the frame 210 is not formed with a step 211, but the shape of the inner side of the frame 210 is not limited to this, and therefore a curved surface corresponding to the outer step 211 can be formed on the inner side to make The thickness of the wall structure of the frame 210 is constant.

When the adhesive 300 contacts the outer side of the frame 210 and the first side surface 100 a of the display panel 100, the adhesive 300 joins the fingerprint sensor 200 to the display panel 100. The height h3 of the part of the adhesive 300 that contacts the frame 210 may be equal to the height h1 of the step 211. Since the height h3 of the adhesive 300 is equal to the height h1 of the step 211, the adhesive requirement of the fingerprint sensor 200 can be met.

After the adhesive 300 is applied to the process of joining the fingerprint sensor 200 to the display panel 100, the worker can easily visually check whether the adhesive 300 is formed to the height h1 of the step 211. That is, the worker can visually compare the height h3 of the adhesive 300 with the height h1 of the step 211, and when the height h3 of the adhesive 300 is lower than the height h1 of the step 211, it can be determined that the fingerprint sensor 200 is adhered as It fails, and when the height h3 of the adhesive 300 is equal to or higher than the height h1 of the step 211, it can be determined that the adhesion of the fingerprint sensor 200 is good. Therefore, the adhesion inspection time of the fingerprint sensor 200 can be shortened.

Fig. 3 is a cross-sectional view of another example of a state where the fingerprint sensor according to an exemplary embodiment is attached to a display panel.

Referring to FIG. 3, due to a manufacturing process error, the height h3 of the adhesive 300 may not match the height h1 of the step 211. The height h3 of the adhesive 300 may be greater than the height h1 of the step 211. The height h3 of the adhesive 300 may be higher than the height h1 of the step 211 and lower than the height h2 of the frame 210. In this case, the adhesion force required by the fingerprint sensor 200 can be satisfied, and the worker can easily confirm whether the adhesion of the fingerprint sensor 200 is defective.

In addition to features different from those of the exemplary embodiment of FIG. 3, the features of the exemplary embodiment described with reference to FIG. 1 and FIG. 2 can be applied to the exemplary embodiment of FIG. 3 described above, and therefore The repeated features will not be explained again.

Fig. 4 is a cross-sectional view of a state where a fingerprint sensor is attached to a display panel according to another exemplary embodiment. Fig. 5 is a cross-sectional view of another example of a state in which the fingerprint sensor is attached to the display panel according to an exemplary embodiment.

Referring to FIGS. 4 and 5, the frame 210 may include an inclined side surface 213 formed on the outer side thereof. The inclined side surface 213 may be a refractive pattern corresponding to an appropriate height of the adhesive 300.

The inclined side surface 213 has an inclination angle of less than 90 degrees with respect to the first side surface 100 a of the display panel 100. The frame 210 may include a shape whose width gradually decreases from the first side surface 100a of the display panel 100 toward the height h1' of the inclined side surface 213. The height h1' of the inclined side surface 213 may be the distance from the first side surface 100a of the display panel 100 to the top of the inclined side surface 213. The height h1' of the inclined side surface 213 may correspond to an appropriate height of the adhesive 300 used to fix the fingerprint sensor 200.

The height h1' of the inclined side surface 213 may be equal to the height of the step 211 described with reference to FIGS. 2 and 3. Alternatively, the height h1' of the inclined side surface 213 may be lower than the height of the step 211 described with reference to FIGS. 2 and 3. The height h1' of the inclined side surface 213 may be lower than the height h2 of the frame 210. The height h1' of the inclined side surface 213 may be approximately 70% or more of the height h2 of the frame 210. Alternatively, the height h1' of the inclined side surface 213 may be approximately 450 μm or more.

The bottom portion of the frame 210 contacting the first side surface 100a of the display panel 100 at the lower portion of one wall structure may have a first width W1. The upper part of the wall structure may have a second width W2 that is smaller than the first width W1. The lower part of the wall structure means a part lower than the height h1' of the inclined side surface 213, and the upper part of the wall structure means a part higher than the height h1' of the inclined side surface 213.

The inclined side surface 213 may be formed on the outside of the lower part of the wall structure. The inclined side surface 213 is formed in the fourth width W4 corresponding to the difference between the first width W1 and the second width W2, and the highest part of the inclined side surface 213 can contact the upper part of the wall structure, and the bottom part of the inclined side surface 213 can be The first side surface 100a of the display panel 100 is contacted.

In Figures 4 and 5, the inner side of the frame is shown as vertical, but the shape of the inner side of the frame 210 is not limited to this, and a curved surface corresponding to the inclined side surface 213 of the outer surface may also be formed on the inner side of the frame. , In order to make the thickness of the wall structure constant.

The adhesive 300 can connect the fingerprint sensor 200 to the display panel 100 by contacting the inclined side surface 213 of the frame 210 and the first side surface 100 a of the display panel 100. The adhesive 300 may cover the inclined side surface 213 of the frame 210. Since the frame 210 includes the inclined side surface 213 and the adhesive 300 covers the inclined side surface 213 of the frame 210, the adhesiveness of the fingerprint sensor 200 can be enhanced.

As exemplarily shown in FIG. 4, the height h3 of the portion of the adhesive 300 that contacts the frame 210 may be equal to the height h1' of the inclined side surface 213. Since the height h3 of the adhesive 300 is equal to the height h1' of the inclined side surface 213, the adhesive requirement of the fingerprint sensor 200 can be met.

As exemplarily shown in FIG. 5, the height h3 of the portion of the adhesive 300 that contacts the frame 210 may be higher than the height h1' of the inclined side surface 213. The height h3 of the adhesive 300 may be higher than the height h1' of the inclined side surface 213 and may be lower than the height h2 of the frame 210. When the height h3 of the adhesive 300 is higher than the height h1' of the inclined side surface 213, the adhesiveness of the fingerprint sensor 200 can be satisfied.

After the adhesive 300 is applied to the process of joining the fingerprint sensor 200 to the display panel 100, the worker can visually compare the height h3 of the adhesive 300 with the height h1' of the inclined side surface 213 to determine whether the adhesive 300 is formed to be inclined The height of the side surface 213 is h1'. When the height h3 of the adhesive 300 is lower than the height h1' of the inclined side surface 213, the worker can determine that the adhesive quality of the fingerprint sensor 200 is defective, and when the height h3 of the adhesive 300 is higher than or equal to the height h1 of the inclined side surface 213 At this time, the worker can determine that the adhesion quality of the fingerprint sensor 200 is good.

In addition to the features different from the features of the exemplary embodiment in FIGS. 4 and 5, the features of the exemplary embodiment described with reference to FIGS. 1 and 2 can be applied to the above-mentioned FIGS. 4 and 5 An exemplary embodiment of, and therefore repeated features will not be explained again.

Fig. 6 is a cross-sectional view of a state where a fingerprint sensor is attached to a display panel according to another exemplary embodiment. Fig. 7 is a cross-sectional view of another example of a state where the fingerprint sensor is attached to the display panel according to an exemplary embodiment.

Referring to FIGS. 6 and 7, the frame 210 may include a groove 215 formed on the outside thereof. The groove 215 may be a refractive pattern corresponding to an appropriate height of the adhesive 300.

The bottom portion of the lower portion of one wall structure of the frame 210 that contacts the first side surface 100a of the display panel 100 has a first width W1, and the upper portion of the wall structure may have a second width W2 equal to the first width W1.

The groove 215 may include a shape recessed at the outer side of the frame 210 by a maximum of the fifth width W5. The fifth width W5 is smaller than the first width W1. The groove 215 may be formed on the outside of the lower part of the wall structure. The highest part of the groove 215 may contact the upper part of the wall structure, and the bottom part of the groove 215 may contact the first side surface 100 a of the display panel 100. The lower part of the wall structure is a part lower than the height h1' of the trench 215, and the upper part of the wall structure is a part higher than the height h1'' of the trench 215.

The height h1' of the groove 215 may correspond to an appropriate height of the adhesive 300 used to fix the fingerprint sensor 200. The height h1' of the trench 215 contacting the upper part of the wall structure may be the distance from the first side surface 100a of the display panel 100 to the highest part of the trench 215. The height h1'' of the trench 215 may be equal to the height h1 of the step 211 described with reference to FIGS. 2 and 3. Alternatively, the height h1'' of the trench 215 may be lower than the height h1 of the step 211 described with reference to FIGS. 2 and 3. The height h1' of the groove 215 may be lower than the height h2 of the frame 210. The height h1' of the groove 215 may be 70% or more of the height h2 of the frame 210. Alternatively, the height h1'' of the trench 215 may be approximately 450 µm.

In Figures 6 and 7, the inner side of the frame 210 is shown as being vertical, but the shape of the inner side of the frame 210 is not limited to this, and a groove 215 corresponding to the groove 215 on the outer surface may also be formed on the inner side of the frame. Curved surface to make the thickness of the wall structure constant

The adhesive 300 can bond the fingerprint sensor 200 to the display panel 100 through the groove 215 of the contact frame 210 and the first side surface 100 a of the display panel 100. The adhesive 300 may be inserted into the groove 215 of the frame 210. Since the frame 210 includes the groove 215 and the adhesive 300 is inserted into the groove 215, the adhesiveness of the fingerprint sensor 200 can be further enhanced.

As exemplarily shown in FIG. 6, the height h3 of the portion of the adhesive 300 that contacts the frame 210 may be equal to the height h1' of the groove 215. Since the height h3 of the adhesive 300 is equal to the height h1'' of the groove 215, the adhesive force required by the fingerprint sensor 200 can be met.

As exemplarily shown in FIG. 7, the height h3 of the portion of the adhesive 300 that contacts the frame 210 may be higher than the height h1' of the groove 215. The height h3 of the adhesive 300 may be higher than the height h1' of the groove 215 and may be lower than the height h2 of the frame 210. When the height h3 of the adhesive 300 is higher than the height h1'' of the groove 215, the adhesive force required by the fingerprint sensor 200 can be satisfied.

After the adhesive 300 is applied to the process of joining the fingerprint sensor 200 to the display panel 100, the worker can visually compare the height h3 of the adhesive 300 with the height h1" of the groove 215 to determine whether the adhesive 300 is formed to The height of the trench 215 is h1". When the height h3 of the adhesive 300 is lower than the height h1" of the groove 215, the worker can determine that the adhesive quality of the fingerprint sensor 200 is defective, and when the height h3 of the adhesive 300 is higher than or equal to the height of the groove 215 When h1'', the worker can confirm that the adhesion quality of the fingerprint sensor 200 is good

In addition to the features different from the features of the exemplary embodiment in FIGS. 6 and 7, the features of the exemplary embodiment described with reference to FIGS. 1 and 2 can be applied to the above-mentioned FIGS. 6 and 7 An exemplary embodiment of, and therefore repeated features will not be explained again.

Fig. 8 is a cross-sectional view of an example of an optical fingerprint sensor.

Referring to FIG. 8, when an optical fingerprint sensor is provided as the fingerprint sensor, the sensing part 220 may include a detector 221, an infrared filter 222, an adhesive layer 223 and a lens part 224.

The detector 221 is disposed in the base substrate 230 and is electrically connected to the base substrate 230 at the same time. The detector 221 may include a charge coupled device (CCD), a complementary metal oxide semiconductor (CMOS), and the like.

The infrared filter 222 is located in front of the detector 221 so that the light passes through the infrared filter 222 and is received by the detector 221. The infrared filter 222 removes the long-wavelength component of the light to reduce the noise of the light received by the detector 221.

An adhesive layer 223 is provided between the infrared filter 222 and the detector 221 to bond the infrared filter 222 to the detector 221.

The air layer AL may be disposed between the infrared filter 222 and the lens part 224 and between the lens part 224 and the first side surface 100a of the display panel 100.

The lens part 224 may be separated from the infrared filter 222 by a predetermined distance through the air layer AL located between the infrared filter 222 and the lens part 224. The light reflected by the finger on the second side surface 100b of the display panel 100 passes through the lens part 224 and is focused to the detector 221 to be received after being generated.

In Fig. 8, the adhesive for joining the frame supporting the sensing portion 220 and the fingerprint sensor to the display panel 100 is omitted, and in the fingerprint sensor of Fig. 8, the adhesive according to Figs. 2 to The frame 210 and the adhesive 300 of any one of the above-mentioned exemplary embodiments shown in FIG. 7.

FIG. 9 is an exploded perspective view of a display device including a fingerprint sensor according to another exemplary embodiment. FIG. 10 is a cross-sectional view of an example of a state where the fingerprint sensor according to an exemplary embodiment is attached to the back substrate. FIG. 11 is a cross-sectional view of another example of a state where the fingerprint sensor according to an exemplary embodiment is attached to the back substrate.

Referring to FIGS. 9 to 11, the display device includes a display panel 100, a back substrate 400 facing the display panel 100, a fingerprint sensor 200 disposed on the upper portion of the back substrate 400, and the fingerprint sensor 200 is bonded to the back The adhesive 300 of the substrate 400.

The back substrate 400 is disposed on the rear side of the display panel 100, and may be designed to insert or mount a part of a display device or a printed board module thereon. The back substrate 400 may be a substrate supporting or protecting the rear side of the display panel 100.

The back substrate 400 includes a first side surface 400a and a second side surface 400b opposite to the first side surface 400a. The first side 400a of the back substrate 400 may face the first side 100a of the display panel 100. The fingerprint sensor 200 may be attached to the first side surface 400 a of the back substrate 400.

The base substrate 230 is disposed on the back substrate 400, and the frame 210 and the sensing part 220 may be disposed on the base substrate 230. In this case, the height h2 of the frame 210 from the first side surface 400a may be higher than the height of the sensing part 220. This is to provide an air layer (corresponding to the air layer AL in Figure 2) in the space between the sensing portion 220 and the display panel 100.

The frame 210 includes a step 211 formed on the outside thereof, and the height h1 of the step 211 corresponding to an appropriate height of the adhesive 300 for fixing the fingerprint sensor 200 may include the thickness h5 of the base substrate 230. The height h2 of the frame 210 may include the thickness h5 of the base substrate 230. The height h1 of the step 211 may be lower than the height h2 of the frame.

The adhesive 300 may penetrate the outer side of the contact frame 210, the side surface of the base substrate 230, and the first side surface 400a of the back substrate 400 to bond the fingerprint sensor 200 to the back substrate 400.

As exemplarily shown in FIG. 10, the height h3 of the adhesive 300 may be equal to the height h1 of the step 211. Alternatively, as exemplarily shown in FIG. 11, the height h3 of the adhesive 300 may be higher than the height h1 of the step 211. The height h3 of the adhesive 300 is the height of the part where the adhesive 300 contacts the outside of the frame 210 and the side surface of the base substrate 230.

In addition to the features different from the features of the exemplary embodiment in FIGS. 9 to 11, the features of the exemplary embodiment described with reference to FIGS. 1 and 2 can be applied to the above-mentioned FIGS. 9 to 11 An exemplary embodiment of, and therefore repeated features will not be explained again.

Fig. 12 is a cross-sectional view of an example of a state where a fingerprint sensor according to another exemplary embodiment is attached to a back substrate. Fig. 13 is a cross-sectional view of another example of a state where the fingerprint sensor according to an exemplary embodiment is attached to the back substrate.

Referring to FIGS. 12 and 13, the frame 210 includes an inclined side surface 213 formed on the outer side thereof. The inclined side surface 213 has an inclination angle of less than 90 degrees with respect to the first side surface 400a of the back substrate 400.

The height h1' of the inclined side surface 213 corresponding to the appropriate height of the adhesive 300 for fixing the fingerprint sensor 200 may include the thickness h5 of the base substrate 230. The height h2 of the frame 210 may include the thickness h5 of the base substrate 230. The height h1' of the inclined side surface 213 may be lower than the height h2 of the frame 210.

The adhesive 300 can connect the fingerprint sensor 200 to the back substrate 400 by contacting the inclined side surface 213 of the frame 210, the side surface of the base substrate 230, and the first side surface 400a of the back substrate 400,

As exemplarily shown in FIG. 12, the height h3 of the adhesive 300 may be the same as the height h1' of the inclined side surface 213. Alternatively, as exemplarily shown in FIG. 13, the height h3 of the adhesive 300 may be higher than the height h1' of the inclined side surface 213.

In addition to the features different from the features of the exemplary embodiment of FIGS. 12 and 13, the features of the exemplary embodiment described with reference to FIGS. 4 and 5 and the features of the exemplary embodiment described with reference to FIGS. 9 to 11 The features of the exemplary embodiment of may be applied to the exemplary embodiments of FIG. 12 and FIG. 13 described above, and therefore, the repeated features will not be described again.

Fig. 14 is a cross-sectional view of an example of a state in which a fingerprint sensor according to another exemplary embodiment is attached to a back substrate. FIG. 15 is a cross-sectional view of another example of a state where the fingerprint sensor according to an exemplary embodiment is attached to the back substrate.

Referring to FIGS. 14 and 15, the frame 210 includes a groove 215 formed on the outer side thereof. The highest part of the trench 215 may contact the upper part of the wall structure, and the lowest part of the trench 215 may contact the base substrate 230.

The height h1' of the groove 215 corresponding to the appropriate height of the adhesive 300 for fixing the fingerprint sensor 200 may include the thickness h5 of the base substrate 230. The height h2 of the frame 210 may include the thickness h5 of the base substrate 230 of the base substrate 230. The height h1' of the groove 215 may be lower than the height h2 of the frame 210.

The adhesive 300 may pass through the groove 215 of the contact frame 210, the side surface of the base substrate 230, and the first side surface 400a of the back substrate 400 to bond the fingerprint sensor 200 to the back substrate 400.

As exemplarily shown in FIG. 14, the height h3 of the adhesive 300 may be equal to the height h1' of the groove 215. Alternatively, as exemplarily shown in FIG. 15, the height h3 of the adhesive 300 may be higher than the height h1' of the groove 215.

In addition to the features different from the features of the exemplary embodiment of FIGS. 14 and 15, the features of the exemplary embodiment described with reference to FIGS. 6 and 7 and the features of the exemplary embodiment described with reference to FIGS. 9 to 11 The features of the exemplary embodiment of may be applied to the exemplary embodiments of FIG. 14 and FIG. 15 described above, and therefore, repeated features will not be described again.

Figure 16 is a cross-sectional view of another example of an optical fingerprint sensor.

Referring to FIG. 16, when the optical fingerprint sensor is disposed on the first side 400a of the back substrate 400 facing the first side 100a of the display panel 100, the base substrate 230 may be disposed on the first side 400a of the back substrate 400 on. The detector 221, the adhesive layer 223, the infrared filter 222, and the lens part 224 may be sequentially disposed on the base substrate 230. The air layer AL may be disposed between the infrared filter 222 and the lens part 224 and between the lens part 224 and the first side surface 100a of the display panel 100.

The light generated by the display panel 100 is reflected by the finger in the second side surface 100b of the display panel 100, and passes through the lens part 224 and the infrared filter 222 to be received at the detector 221. The detector 221 can convert the received light into an electrical signal.

In Figure 16, the adhesive for bonding the frame supporting the sensing portion 220 and the fingerprint sensor to the back substrate 400 is omitted, and the frame 210 and the frame according to the above-mentioned exemplary embodiment in Figures 10 to 15 are omitted. The adhesive 300 can be applied to the fingerprint sensor in FIG. 16.

The above-mentioned drawings and detailed description of the present invention are only examples of the present invention, and are only used to illustrate the present invention, not to limit the meaning or scope of the present invention described in the scope of the patent application. Therefore, those having ordinary knowledge in the art can understand that various modifications and other exemplary embodiments equivalent to the present invention are possible. Therefore, the technical protection scope of the present invention should be defined based on the technical spirit of the appended application patent scope.

100: display panel 100a: first side 100b: second side 200: Fingerprint sensor 210: Frame 211: step 213: Slant side 215: groove 220: sensing part 221: Detector 222: infrared filter 223: Adhesive Layer 224: lens part 230: base substrate 300: Adhesive 400: back substrate 400a: first side 400b: second side AL: Air layer W1: first width W2: second width W3: third width W4: Fourth width W5: fifth width h1,h1’,h1’’,h2,h3,h4: height h5: thickness

FIG. 1 is a schematic top view of a display device including a fingerprint sensor according to an exemplary embodiment. Fig. 2 is a cross-sectional view of a state in which a fingerprint sensor is attached to a display panel according to an exemplary embodiment. Fig. 3 is a cross-sectional view of another example of a state where the fingerprint sensor according to an exemplary embodiment is attached to a display panel. Fig. 4 is a cross-sectional view of a state where a fingerprint sensor is attached to a display panel according to another exemplary embodiment. Fig. 5 is a cross-sectional view of another example of a state in which the fingerprint sensor is attached to the display panel according to an exemplary embodiment. Fig. 6 is a cross-sectional view of a state where a fingerprint sensor is attached to a display panel according to another exemplary embodiment. Fig. 7 is a cross-sectional view of another example of a state where the fingerprint sensor is attached to the display panel according to an exemplary embodiment. Fig. 8 is a cross-sectional view of an example of an optical fingerprint sensor. FIG. 9 is an exploded perspective view of a display device including a fingerprint sensor according to another exemplary embodiment. FIG. 10 is a cross-sectional view of an example of a state where the fingerprint sensor according to an exemplary embodiment is attached to the back substrate. FIG. 11 is a cross-sectional view of another example of a state where the fingerprint sensor according to an exemplary embodiment is attached to the back substrate. Fig. 12 is a cross-sectional view of an example of a state where a fingerprint sensor according to another exemplary embodiment is attached to a back substrate. Fig. 13 is a cross-sectional view of another example of a state where the fingerprint sensor according to an exemplary embodiment is attached to the back substrate. Fig. 14 is a cross-sectional view of an example of a state in which a fingerprint sensor according to another exemplary embodiment is attached to a back substrate. FIG. 15 is a cross-sectional view of another example of a state where the fingerprint sensor according to an exemplary embodiment is attached to the back substrate. Figure 16 is a cross-sectional view of another example of an optical fingerprint sensor.

100: display panel

100a: first side

100b: second side

200: Fingerprint sensor

210: Frame

211: step

220: sensing part

230: base substrate

300: Adhesive

AL: Air layer

W1: first width

W2: second width

W3: third width

h1, h2, h3: height

Claims (10)

A display device including: A display panel or a substrate; A fingerprint sensor arranged on a first side surface of the display panel or the substrate, and comprising a frame and a sensing part arranged in the frame; and An adhesive for bonding the fingerprint sensor to the display panel or the substrate by contacting an outer side of the frame and the first side surface of the display panel or the substrate; Wherein, a refraction pattern corresponding to an appropriate height of the adhesive is formed on the outer side of the frame, and the height of the part where the adhesive contacts the frame is higher than or equal to the height of the refraction pattern. The display device according to claim 1, wherein the refraction pattern includes a step formed on the outer side of the frame. The display device according to claim 2, wherein the height of the step is a distance from the first side surface of the display panel or the substrate to the step, and it corresponds to the appropriate height of the adhesive. The display device according to claim 3, wherein the height of the part of the adhesive that contacts the frame is equal to or higher than the height of the step. The display device according to claim 1, wherein the refraction pattern includes an inclined side surface formed on the outer side of the frame. The display device according to claim 5, wherein the height of the inclined side surface is the distance from the first side surface of the display panel or the substrate to the highest part of the inclined side surface, and it corresponds to the appropriate height of the adhesive. The display device according to claim 6, wherein the height of the part of the adhesive in contact with the frame is equal to or higher than the height of the inclined side surface. The display device according to claim 1, wherein the refraction pattern includes a groove formed on the outer side of the frame. The display device according to claim 8, wherein the height of the groove is a distance from the first side surface of the display panel or the substrate to the highest part of the groove, and it corresponds to the appropriate height of the adhesive. The display device according to claim 9, wherein the height of the portion of the adhesive that contacts the frame is equal to or higher than the height of the groove.

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