KR20190047968A - Display Device - Google Patents

Abstract

According to an embodiment of the present specification, provided is a display device which comprises: a display panel including a display area; a cushion layer and a fingerprint sensor disposed in a lower part of the display panel; and a light blocking layer disposed between the cushion layer and the fingerprint sensor. The cushion layer includes a hole disposed in a lower part of the display area and the fingerprint sensor can be disposed in the hole to minimize a bezel area.

Description

[0001]

TECHNICAL FIELD [0001] The present invention relates to a display device, and more particularly, to a display device including a fingerprint sensor disposed in a display area.

As the era of information age approaches, there is a rapidly developing field of display devices that visually display electrical information signals. The display device is applied to various electronic devices such as a smart phone, a tablet, a laptop computer, a monitor, and a TV.

In recent years, the use of portable electronic devices such as smart phones and tablets has been greatly increased due to the development of mobile communication technology, and studies for developing performance such as thinning, light weight, and low power consumption for such display devices are continuing.

Representative display apparatuses used in a portable display device include a liquid crystal display device (LCD), a field emission display device (FED), an electro-wetting display device (EWD) And organic light emitting display devices (OLEDs).

An electroluminescent display device including an organic light emitting display device is a self-emissive display device, unlike a liquid crystal display device, a separate light source is not required, so that the electroluminescent display device can be manufactured in a light and thin shape, But also has excellent color implementation, response speed, viewing angle, and contrast ratio (CR), which are widely used in portable display devices.

In the electroluminescence display device, an emissive layer (EML) using an organic material is disposed between two electrodes made of an anode and a cathode. When holes in the anode are injected into the light emitting layer and electrons in the cathode are injected into the light emitting layer, excited electrons and holes are recombined to form excitons in the light emitting layer.

Recently used portable electronic device stores personal information such as a contact, a call history, a message, a photograph, a memo, a web surfing information of a user, location information, and financial information in addition to a communication function to prevent personal information from being leaked Portable electronic device security is very important.

Of various security technologies applied to portable electronic devices, fingerprint authentication permits the use of portable electronic devices by fingerprint, which is biometric information of a user, to satisfy user convenience while having high security level.

A fingerprint sensor applied to a conventional portable electronic device is disposed in a bezel area which is a non-display area of a portable display device such as a home button. However, if the fingerprint sensor is located in the non-display area of the portable electronic device, the bezel size of the portable electronic device may increase. Accordingly, it is preferable to arrange the fingerprint sensor in the display area of the display device other than the non-display area. However, when the fingerprint sensor is disposed on the backside of the display area of the display device, Lt; / RTI >

Particularly, when light is exposed around the area where the fingerprint sensor is disposed, the characteristics of the display device may change, and a problem that a smudge called a shadow mura is visible to the user may occur, It is important to prevent light from being exposed to light.

Accordingly, the inventors of the present invention have invented a display device of a new structure capable of preventing shadow blur due to external light while arranging a fingerprint sensor applied to a portable electronic device in a display area of the display device.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

The display device according to the embodiment of the present invention includes a display panel including a display area, a cushion layer disposed under the display panel, and a light blocking layer disposed between the fingerprint sensor and the cushion layer and the fingerprint sensor, And a hole disposed at the lower portion.

A display device according to an embodiment of the present invention includes a step of forming a display panel including a display area, a step of disposing a cushion layer including a hole under the display panel, a step of disposing a fingerprint sensor in a hole area of the cushion layer, And forming a light blocking layer between the cushion layer and the fingerprint sensor.

The display device according to the embodiment of the present invention has the effect of minimizing the bezel area of the portable electronic device by disposing the fingerprint sensor in the display area.

The display device according to the embodiment of the present invention has an effect of preventing stain that may be generated as external light in a region where the fingerprint sensor is disposed.

The effect of the display device according to the embodiment of the present invention is not limited by the contents exemplified above, and more various effects are included in the specification.

The scope of the claims is not limited by the matters described in the description of the specification, as the contents of the description in the problems, the solutions to the problems, and the effects described above do not specify the essential features of the claims.

1 is a block diagram of a display device according to an embodiment of the present invention.
2 is a circuit diagram of a pixel included in a display device according to an embodiment of the present invention.
3 is a plan view of a display device according to an embodiment of the present invention.
4 is a detailed sectional view of a display region of a display device according to an embodiment of the present invention.
5 is a plan view of a portable electronic device including a display device according to an embodiment of the present disclosure.
6 is a cross-sectional view of a portable electronic device in which a fingerprint sensor is disposed according to an embodiment of the present invention.
7A to 7D are cross-sectional views illustrating a manufacturing process of a portable electronic device in which a fingerprint sensor is disposed according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

1 is a block diagram of a display device according to an embodiment of the present invention.

The display device described in Fig. 1 is an electroluminescence display device, but is not limited thereto.

Referring to FIG. 1, an EL display device 100 includes an image processing unit 110, a timing controller 120, a data driver 130, a gate driver 140, and a display panel 150.

The image processing unit 110 outputs a data enable signal DE together with a data signal DATA supplied from the outside. The image processing unit 110 may output at least one of a vertical synchronization signal, a horizontal synchronization signal, and a clock signal in addition to the data enable signal DE.

The timing controller 120 receives a data enable signal DE or a data signal DATA in addition to a drive signal including a vertical synchronization signal, a horizontal synchronization signal, and a clock signal from the image processing unit 110. The timing controller 120 generates a gate timing control signal GDC for controlling the operation timing of the gate driver 140 and a data timing control signal DDC for controlling the operation timing of the data driver 130 based on the drive signal. .

The data driver 130 samples and latches the data signal DATA supplied from the timing controller 120 in response to the data timing control signal DDC supplied from the timing controller 120 and converts the sampled data signal into a gamma reference voltage . The data driver 130 outputs the data signal DATA through the data lines DL1 to DLn.

The gate driver 140 outputs a gate signal while shifting the level of the gate voltage in response to the gate timing control signal GDC supplied from the timing controller 120. The gate driver 140 outputs the gate signal through the gate lines GL1 to GLm.

The display panel 150 displays an image while the pixel 160 emits light corresponding to the data signal DATA and the gate signal supplied from the data driver 130 and the gate driver 140. The detailed structure of the pixel 160 will be described in FIG. 2 and FIG.

2 is a circuit diagram of a pixel included in a display device according to an embodiment of the present invention.

The display device described in Fig. 2 is an electroluminescence display device, but is not limited thereto.

2, a pixel of the EL display device 200 includes a switching transistor 240, a driving transistor 250, a compensation circuit 260, and a light emitting element 270.

The light emitting element 270 operates to emit light in accordance with the driving current generated by the driving transistor 250.

The switching transistor 240 performs a switching operation so that a data signal supplied through the data line 230 corresponding to the gate signal supplied through the gate line 220 is stored in the capacitor as a data voltage.

The driving transistor 250 operates so that a constant driving current flows between the high potential power supply line VDD and the low potential power supply line GND in response to the data voltage stored in the capacitor.

The compensation circuit 260 is a circuit for compensating the threshold voltage and the like of the driving transistor 250, and the compensation circuit 260 includes at least one thin film transistor and a capacitor. The configuration of the compensation circuit may vary widely depending on the compensation method.

The pixel of the electroluminescence display device 200 is composed of a 2T (Transistor) 1C (capacitor) structure including a switching transistor 240, a driving transistor 250, a capacitor and a light emitting element 270, 260 can be additionally formed in the present invention, it can be formed into 3T1C, 4T2C, 5T2C, 6T1C, 6T2C, 7T1C, 7T2C and the like.

3 is a plan view of a display device according to an embodiment of the present invention.

The display device described in Fig. 3 is an electroluminescence display device, but is not limited thereto.

3, an electroluminescent (EL) display 300 includes a substrate 310, a thin film transistor (TFT), and a display area (A / A) A non-display area (N / A) that surrounds an edge of the edge of the display area A / A.

A circuit such as a gate driver 390 for driving the electroluminescence display device 300 and various signal wires such as a scan line (S / L) are formed in a non-display area N / A of the substrate 310 . The circuit for driving the electroluminescence display device 300 may be arranged in a GIP (Gate in Panel) on the substrate 310 or a substrate 310 in a TCP (Tape Carrier Package) or COF (Chip on Film) Lt; / RTI >

A pad 395 is disposed on one side of the substrate 310 of the non-display area N / A. The pad 395 is a metal pattern to which the external module is bonded.

  Various wirings are formed on the substrate 310. The wiring may be formed in the display area A / A of the substrate 310. [ Alternatively, the circuit wiring 370 formed in the non-display area N / A may transmit a signal by connecting a driving circuit, a gate driver, a data driver, or the like.

The circuit wiring 370 is formed of a conductive material and may be formed of a conductive material having excellent ductility to reduce the occurrence of cracks when the substrate 310 is bent. For example, the circuit wiring 370 may be formed of a conductive material having excellent ductility such as gold (Au), silver (Ag), aluminum (Al), or the like and may be formed of various conductive materials And may be formed of any one of molybdenum (Mo), chromium (Cr), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and alloys of silver (Ag) . ≪ / RTI > The circuit wiring 370 may be formed of a multilayer structure including various conductive materials, for example, a three-layer structure of titanium (Ti) / aluminum (Al) / titanium (Ti) But is not limited to.

4 is a detailed sectional view of a display region of a display device according to an embodiment of the present invention.

The display device shown in Fig. 4 is an electroluminescent display device, but is not limited thereto, and is a cross-sectional view of the detailed structure of the display area A / A described in Fig.

Referring to FIG. 4, the substrate 410 supports and protects the elements of the EL display device 400 disposed at the upper portion. In recent years, the substrate 410 may be made of a flexible material having a flexible characteristic, 410 may be a flexible substrate. For example, the flexible substrate may be in the form of a film comprising one of the group consisting of a polyester-based polymer, a silicon-based polymer, an acrylic polymer, a polyolefin-based polymer, and a copolymer thereof.

For example, the substrate 410 may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polysilane, polysiloxane, polysilazane, polycarbosilane, But are not limited to, polyacrylate, polymethacrylate, polymethylacrylate, polymethylmetacrylate, polyethylacrylate, polyethylmetacrylate, (CO), cyclic olefin polymer (COP), polyethylene (PE), polypropylene (PP), polyimide (PI), polymethylmethacrylate (PMMA), polystyrene (PS), polyacetal (POM), polyetheretherketone (PEEK), polyester sulfone (PES), polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), polycarbonate (PVDF), perfluoroalkyl polymer (PFA), styrene acrylonitrile polymer (SAN), and combinations thereof.

A buffer layer may be further disposed on the substrate 410. The buffer layer prevents penetration of moisture or other impurities through the substrate 410 and can flatten the surface of the substrate 410. The buffer layer is not necessarily required, and may be removed depending on the type of the substrate 410 and the type of the thin film transistor 420 disposed on the substrate 410.

The thin film transistor 420 disposed on the substrate 410 includes a gate electrode 422, a source electrode 424, a drain electrode 426, and a semiconductor layer 428.

The semiconductor layer 428 has a higher mobility than amorphous silicon or amorphous silicon and thus has low energy consumption and excellent reliability and can be applied to polycrystalline silicon ), But is not limited thereto.

The semiconductor layer may be formed of an oxide semiconductor. The oxide semiconductor has characteristics of excellent mobility and uniformity. The oxide semiconductors include indium tin gallium zinc oxide (InSnGaZnO) based materials which are quaternary metal oxides, indium gallium zinc oxide (InGaZnO) based materials which are ternary metal oxides, indium tin zinc oxide (InSnZnO) based materials, indium aluminum zinc oxide ) Based material, tin-gallium zinc oxide (SnGaZnO) -based material, aluminum gallium zinc oxide (AlGaZnO) -base material, tin aluminum zinc oxide (SnAlZnO) -based material, bimetallic metal oxide indium zinc oxide (InZnO) An InGaO 3 -based material, an InGaO 3 -based material, an InGaO 3 -based material, an InGaO 3 -based material, an AlGaN-based material, an SnZnO 3 -based material, an AlZnO 3 -based material, a ZnMgO 3 -based tin magnesium oxide material, The semiconductor layer 428 can be constituted by a material, an indium oxide (InO) based material, a tin oxide (SnO) based material, a zinc oxide (ZnO) The composition ratio of each element is not limited.

The semiconductor layer 428 may include a source region including a p-type or an n-type impurity, a drain region, and a channel between the source region and the drain region, And may include a lightly doped region between the adjacent source and drain regions.

The source region and the drain region are regions where the impurity is highly doped, and the source electrode 424 and the drain electrode 426 of the thin film transistor 420 are connected, respectively. The p-type impurity may be one of boron (B), aluminum (Al), gallium (Ga), and indium (In), and the n-type impurity may be phosphorus P), arsenic (As) and antimony (Sb).

The semiconductor layer 428 may be doped with an n-type impurity or a p-type impurity depending on the structure of the NMOS or PMOS thin film transistor, and the thin film transistor included in the electroluminescence display according to an embodiment of the present invention may include an NMOS Or a PMOS thin film transistor is applicable.

The first insulating layer 431 is an insulating layer composed of a single layer of silicon oxide (SiOx) or silicon nitride (SiNx) or a multilayer thereof and a current flowing in the semiconductor layer 428 flows into the gate electrode 422 . The silicon oxide is less ductile than the metal, but is superior in ductility to silicon nitride and can be formed into a single layer or a plurality of layers depending on the characteristics.

The gate electrode 422 serves as a switch for turning on or turning off the thin film transistor 420 based on an electric signal transmitted from the outside through the gate line, (Al), molybdenum (Mo), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), and neodymium (Nd) Or multiple layers, but is not limited thereto.

The source electrode 424 and the drain electrode 426 are connected to the data line and electric signals transmitted from the outside are transmitted from the thin film transistor 420 to the light emitting element 440. The source electrode 424 and the drain electrode 426 are formed of a conductive metal such as Cu, Al, Mo, Cr, Au, Ti, Ni, And neodymium (Nd), or an alloy thereof, and may be composed of a single layer or a multilayer, but is not limited thereto.

A second insulating layer 433 composed of a single layer or multiple layers of silicon oxide (SiOx) or silicon nitride (SiNx) is formed to cover the gate electrode 422, the source electrode 424, and the drain electrode 426, And between the electrode 422 and the source electrode 424 and the drain electrode 426.

A passivation layer composed of an inorganic insulating layer such as silicon oxide (SiOx) or silicon nitride (SiNx) may be further disposed on the thin film transistor 420. [ The passivation layer can prevent unnecessary electrical connection between the passivation layer constituents and prevent contamination or damage from the outside. The passivation layer can be omitted depending on the configuration and characteristics of the thin film transistor 420 and the light emitting element 440 You may.

The thin film transistor 420 may be classified into an inverted staggered structure and a coplanar structure depending on the positions of the constituent elements of the thin film transistor 420. In the thin film transistor of the inverted staggered structure, the gate electrode is located on the opposite side of the source electrode and the drain electrode with respect to the semiconductor layer. 4, the thin film transistor 420 of the coplanar structure has the gate electrode 422 located on the same side of the source electrode 424 and the drain electrode 426 as the semiconductor layer 428 as a reference.

Although the thin film transistor 420 of the coplanar structure is illustrated in FIG. 4, the electroluminescent display 400 may include a thin film transistor of an inverted staggered structure.

For convenience of explanation, only the driving thin film transistor among various thin film transistors included in the electroluminescence display device 400 is shown, and a switching thin film transistor, a capacitor, and the like may be included in the electroluminescence display device 400 as well. When a signal is applied from the gate wiring, the switching thin film transistor transfers a signal from the data wiring to the gate electrode of the driving thin film transistor. The driving thin film transistor transmits a current, which is transmitted through the power supply wiring, to the anode 442 by a signal received from the switching thin film transistor, and controls the light emission by the current transmitted to the anode 442.

The parasitic capacitance generated between the thin film transistor 420 and the gate line and the data line and the light emitting elements 440 is reduced by protecting the thin film transistor 420 and alleviating a step generated by the thin film transistor 420. [ The planarization layers 435 and 437 are disposed on the thin film transistor 420 in order to reduce capacitance.

The planarization layers 435 and 437 may be formed of an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, a polyimide resin, an unsaturated polyester resin, But is not limited to, one or more of Unsaturated Polyesters Resin, Polyphenylene Resin, Polyphenylenesulfides Resin, and Benzocyclobutene.

The electroluminescent display 400 according to the embodiment of the present invention may include a first planarization layer 435 and a second planarization layer 437 which are a plurality of planarization layers 435 and 437 sequentially stacked.

For example, a first planarization layer 435 may be stacked on the thin film transistor 420, and a second planarization layer 437 may be sequentially stacked on the first planarization layer 435.

A buffer layer may be disposed on the first planarization layer 435. The buffer layer is disposed to protect the components disposed on the first planarization layer 435 and may be a single layer of silicon nitride (SiNx) or silicon oxide (SiOx) or a multiple layer of silicon nitride (SiNx) or silicon oxide Layer, and may be omitted depending on the configuration and characteristics of the thin film transistor 420 and the light emitting element 440. [

The intermediate electrode 430 is connected to the thin film transistor 420 through a contact hole formed in the first planarization layer 435. The intermediate electrode 430 may be laminated to be connected to the thin film transistor 420, and the data line may be formed in a multi-layer structure.

Since the data line can be formed in a structure in which the lower layer made of the same material as the source electrode 424 and the drain electrode 426 and the layer made of the same material as the intermediate electrode 430 are connected to each other, Since the data line can be implemented in a connected structure, the wiring resistance of the data line can be reduced.

A passivation layer composed of an inorganic insulating layer such as silicon oxide (SiOx) or silicon nitride (SiNx) may be further disposed on the first planarizing layer 435 and the intermediate electrode 430. [ The passivation layer may prevent unnecessary electrical connection between the components and prevent contamination or damage from the outside, and may be omitted depending on the configuration and characteristics of the thin film transistor 420 and the light emitting device 440.

The light emitting element 440 disposed on the second planarization layer 437 includes an anode 442, a light emitting portion 444, and a cathode 446.

The anode 442 may be disposed on the second planarization layer 437. The anode 442 is an electrode serving to supply holes to the light emitting portion 444 and is connected to the intermediate electrode 430 through a contact hole in the second planarization layer 437. The anode 442 is electrically connected to the thin film transistor 420, Lt; / RTI >

The anode 442 may be formed of indium tin oxide (ITO), indium zinc oxide (IZO) or the like, which is a transparent conductive material, but is not limited thereto.

When the electroluminescent display device 400 is in the top emission mode in which the cathode 446 is disposed, the emitted light is reflected by the anode 442 so that the cathode 446 is arranged more smoothly So that it can be emitted in the upward direction.

For example, the anode 442 may be a two-layer structure in which a transparent conductive layer composed of a transparent conductive material and a reflective layer are sequentially stacked, or a three-layer structure in which a transparent conductive layer, a reflective layer, and a transparent conductive layer are sequentially stacked, Silver (Ag) or an alloy containing silver.

The bank 450 disposed on the anode 442 and the second planarization layer 437 can define a pixel by dividing a region that actually emits light. After the photoresist is formed on the anode 442, the bank 450 is formed by photolithography. A photoresist is a photosensitive resin whose solubility in a developer is changed by the action of light, and a specific pattern can be obtained by exposing and developing the photoresist. The photoresist can be classified into a positive photoresist and a negative photoresist. The positive type photoresist refers to a photoresist whose solubility in a developing solution of the exposed portion is increased by exposure. When the positive type photoresist is developed, a pattern in which the exposed portion is removed is obtained. The negative type photoresist is a photoresist which is greatly reduced in the solubility of the exposed portion in a developing solution upon exposure. When the negative type photoresist is developed, a pattern in which the non-exposed portion is removed is obtained.

A FMM (Fine Metal Mask) which is a deposition mask may be used to form the light emitting portion 444 of the light emitting element 440. In order to prevent damage that may occur in contact with the deposition masks disposed on the banks 450 and to maintain a certain distance between the banks 450 and the deposition masks, (Spacer) 452 made of one of a perovskite-mesoporous, a photoacid, a benzocyclobutene (BCB) may be disposed.

A light emitting portion 444 is disposed between the anode 442 and the cathode 446. The light emitting portion 444 emits light and includes a hole injection layer (HIL), a hole transport layer (HTL), a light emitting layer, an electron transport layer (ETL) And an electron injection layer (EIL), and some components of the light emitting portion 444 may be omitted depending on the structure or characteristics of the electroluminescence display device 400. Here, the electroluminescent layer and the inorganic luminescent layer can be applied to the luminescent layer.

The hole injection layer is disposed on the anode 442, and serves to smoothly inject holes. The hole injection layer may be formed by, for example, HAT-CN (dipyrazino [2,3-f: 2 ', 3'-h] quinoxaline-2,3,6,7,10.11-hexacarbonitrile), CuPc NPD (N, N'-bis (naphthalene-1-yl) -N, N'-bis (phenyl) -2,2'-dimethylbenzidine).

The hole transport layer is disposed on the hole injection layer and serves to smoothly transfer holes to the light emitting layer. The hole transporting layer may be formed of, for example, NPD (N, N'-bis (naphthalene-1-yl) -N, N'- TAD (2,2 ', 7,7'-tetrakis (N, N-dimethylamino) -9,9-spirofluorene) - (3-methylphenyl) -N, N'- , And MTDATA (4,4 ', 4 "-Tris (N-3-methylphenyl-N-phenylamino) -triphenylamine).

The light emitting layer is disposed on the hole transporting layer and can emit light of a specific color including a substance capable of emitting light of a specific color. The light emitting material may be formed using a phosphor or a fluorescent material.

When the light emitting layer emits red light, the peak wavelength of emitted light may be in the range of 600 nm to 650 nm, and CBP (4,4'-bis (carbazol-9-yl) biphenyl) or mCP bis (1-phenylisoquinoline) acetylacetonate iridium), PQIr (acac) (bis (1-phenylquinoline) (acetylacetonate) ) iridium, PQIr (tris (1-phenylquinoline) iridium), and PtOEP (octaethylporphyrin platinum). Or a fluorescent material containing PBD: Eu (DBM) 3 (Phen) or Perylene.

Here, the peak wavelength? Max refers to the maximum wavelength of EL (Electroluminescence). The wavelength at which the light emitting layers forming the light emitting portion emit light intrinsically is referred to as PL (Photo Luminescence), and the light that is influenced by the thickness and optical characteristics of the layers constituting the light emitting layers is referred to as emittance. At this time, EL (Electroluminescence) refers to light finally emitted by the electroluminescence display device, and can be expressed by a product of PL (Photo Luminescence) and Emittance.

When the light emitting layer emits green light, the peak emission wavelength may range from 520 nm to 540 nm, including a host material including CBP or mCP, and Ir (ppy) 3 (tris (2-phenylpyridine) iridium Lt; RTI ID = 0.0 > Ir complex < / RTI > Further, it may be made of a fluorescent material containing Alq3 (tris (8-hydroxyquinolino) aluminum).

When the light emitting layer emits blue light, the peak emission wavelength may range from 440 nm to 480 nm, including a host material including CBP or mCP, and FIrPic (bis (3,5-difluoro-2 - (2-pyridyl) phenyl- (2-carboxypyridyl) iridium), and a phosphorescent material containing a dopant material such as spiro-DPVBi (4,4'-Bis -1-yl) biphenyl, DSA (1-4-di- [4- (N, N-di-phenyl) amino] styryl-benzene, PFO, polyphenylenevinylene Or a fluorescent material containing one of them.

An electron transporting layer is disposed on the light emitting layer to smooth the movement of electrons to the light emitting layer. The electron transport layer may be formed of, for example, Liq (8-hydroxyquinolinolato-lithium), PBD (2- (4-biphenyl) -5- (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline) and BAlq (4-biphenyl) (bis (2-methyl-8-quinolinolate) -4- (phenylphenolato) aluminum).

An electron injection layer may further be disposed on the electron transporting layer. The electron injection layer is an organic layer that facilitates the injection of electrons from the cathode 446, and may be omitted depending on the structure and characteristics of the electroluminescence display device 400. The electron injection layer may be a metal inorganic compound such as BaF2, LiF, NaCl, CsF, Li2O and BaO, and may be a dipyrazino [2,3-f: 2 ', 3'-h] quinoxaline- 6,7,10.11-hexacarbonitrile), CuPc (phthalocyanine), and NPD (N, N'-bis (naphthalene-1-yl) -N, N'-bis May be one or more organic compounds.

An electron blocking layer or a hole blocking layer blocking the flow of holes or electrons is disposed at a position adjacent to the light emitting layer so that when electrons are injected into the light emitting layer, they move from the light emitting layer to pass through the adjacent hole transporting layer It is possible to prevent the phenomenon that the holes migrate from the light emitting layer to the adjacent electron transporting layer when the holes are injected into the light emitting layer, thereby improving the light emitting efficiency.

The cathode 446 is disposed on the light emitting portion 444 and serves to supply electrons to the light emitting portion 444. [ The cathode 446 may be formed of a metal material such as magnesium (Mg), silver-magnesium (Ag: Mg) or the like, which is a conductive material having a low work function, and is not limited thereto.

When the electroluminescent display device 400 is a top-mounted type, the cathode 446 is formed of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO) Zinc oxide (ZnO), and tin oxide (TiO 2).

The thin film transistor 420 and the light emitting element 440 which are components of the electroluminescence display device 400 are sealed on the light emitting element 440 with a bag for preventing oxidation or damage due to moisture, A plurality of sealing layers, a foreign material compensation layer, and a plurality of barrier films may be stacked.

The sealing layer is disposed on the upper surface of the thin film transistor 420 and the light emitting device 440 and may be composed of one of silicon nitride (SiNx) or aluminum oxide (AlOz), which is an inorganic material.

An encapsulation layer may be further disposed on the foreign material compensation layer disposed on the encapsulation layer.

The foreign material compensation layer is disposed on the sealing layer and may be an organic material such as silicon oxy carbon (SiOCz), acrylic or epoxy resin, but not limited thereto, When a defect occurs due to a foreign substance or a crack generated by a particle, the foreign substance compensating layer can compensate the foreign substance by covering the foreign object.

A barrier film may be disposed on the sealing layer and the foreign material compensation layer so that the electroluminescent display device 400 can delay the penetration of oxygen and moisture from the outside. The barrier film may be formed of an insulating material selected from the group consisting of olefin series, acrylic series and silicon series, or COP (Cyclolefin A barrier film composed of any one of a polymer, a COC (Cycloolefin Copolymer), and a PC (Polycarbonate) may be further laminated, but the present invention is not limited thereto.

5 is a plan view of a portable electronic device including a display device according to an embodiment of the present disclosure.

The portable electronic device described in FIG. 5 is a smartphone, but is not limited thereto, and may be a tablet or a laptop computer.

5, the portable electronic device 500 may include various components such as a case, a display device, an audio output module, an image sensor, an ambient light sensor, a speaker, a microphone, an earphone port, .

A display area in which pixels actually emitting light are arranged in the display device described with reference to Fig. 3 is disposed in a display area A / A of the portable electronic device 500 and surrounds the periphery of the edge of the display area A / A The non-display area is disposed in a non-active area (N / A) where the case of the portable electronic device is located.

The case disposed in the non-display area N / A covers and supports the front surface, the side surface, and the back surface of the portable electronic device. The case may be formed of plastic, and a display device, an audio output module, a camera, and an illuminance sensor may be disposed on the front surface, and a microphone, an earphone port, and a charging port may be disposed on the side surface.

The image sensor senses the amount of incident light and adjusts the luminance of the display device. The microphone outputs the sound signal to the microphone, Converts the sound wave of the user's voice into an electric signal and transmits it to the other party. The speaker outputs an acoustic signal related to a function or an application performed in the portable electronic device, and the earphone port outputs an acoustic signal to the earphone when the earphone is plugged in. The charging port is a port to which a charger for charging the battery of the portable electronic device is connected.

In one area of the display area A / A of the portable electronic device according to the embodiment of the present invention, a fingerprint sensing area (S / A) in which a fingerprint sensor is disposed is disposed to recognize a fingerprint. The structure of the fingerprint sensing area will be described in detail with reference to FIG. 6 to FIG.

6 is a cross-sectional view of a portable electronic device in which a fingerprint sensor is disposed according to an embodiment of the present invention.

The display device described with reference to FIG. 6 is an electroluminescence display device, but the present invention is not limited thereto. Some of the components in FIG. 5 are substantially the same as or similar to those described in FIGS. 1 to 5, and a detailed description thereof will be omitted.

6, the portable electronic device 600 includes a cushion layer 620 and a fingerprint sensor 650 disposed below the display device 610 described in FIGS. 1 to 5, A cover glass 670 is disposed.

The cover glass 670 disposed on the upper portion of the display device 610 in order to prevent breakage or scratch of the display device 610 when the portable electronic device 600 is used may be formed by heat treatment Or a reinforced glass or reinforced plastic material which is improved in compressive stress and tensile strength inside by chemical treatment, but is not limited thereto. The cover glass 670 and the display device 610 can be fixed by bonding with an optically transparent resin (OCR) or an optically transparent adhesive film (OCA film). Further, a polarizing film may be added between the cover glass 670 and the display device 610 to prevent a decrease in visibility due to external light reflection.

The cushion layer 620 is disposed under the display device 610 and alleviates an impact when an impact is applied to the display device 610 from the outside. An adhesive material may be applied to the entire surface of the cushion layer 620 to be fixed to the lower portion of the display device 610 without a separate adhesive layer.

A heat dissipation layer may be disposed on the upper surface or the lower surface of the cushion layer 620 to effectively dissipate the heat generated from the display device 610. [ The cushion layer 610 can be formed by further adding a metal layer having a high thermal conductivity, for example, graphite.

5, a fingerprint sensing area S / A for disposing the fingerprint sensor 650 is disposed in a partial area below the display area A / A of the display device 610, and a fingerprint sensing area S / A is formed in the cushion layer 620. [ The hole for the fingerprint sensing area S / A is larger than the size of the fingerprint of the user, and is formed such that the lower surface of the display device 610 is exposed.

A fingerprint sensor 650 for recognizing the fingerprint of the user is disposed in the fingerprint sensing area S / A below the display device 610. The fingerprint sensor 650 may be an optical or ultrasonic fingerprint sensor.

The optical fingerprint sensor recognizes a fingerprint of a user through an optical sensor that emits a predetermined light and emits light with a finger of a user and converts the light reflected from the fingerprint of the finger into an electrical signal. Since the light emitted from the light source is reflected and absorbed by the floor and the valley of the fingerprint of the finger, the fingerprint sensor information of the fingerprint pattern information of the finger is sensed. The ultrasonic fingerprint sensor can shoot the ultrasonic waves with the user's finger and can determine the shape of the fingerprint through the size of the ultrasonic waves reflected from the fingerprint of the finger.

The fingerprint sensor 650 may be provided with an adhesive layer 640 composed of a transparent adhesive film (OCA film) or a transparent adhesive resin (OCR) on the upper surface thereof to be adhered and fixed to the lower surface of the display device 610.

A fingerprint sensing area S / A in which the fingerprint sensor 650 is disposed is formed to be larger than the size of the fingerprint sensor 650 for the manufacturing process margin so that the fingerprint sensor 650 is disposed between the cushion layer 620 and the fingerprint sensor 650 A light leakage gap G is generated. If the display device 610 is exposed by the light incident on the light leakage gap G between the fingerprint sensor 650 and the cushion layer 620, the characteristics of the display device 610 can be changed, Mura) may be recognized by the user.

A light blocking layer 660 made of a resin material is disposed in the light leakage gap G between the fingerprint sensor 650 and the cushion layer 620 to transmit light in the light leakage gap G region It is possible to prevent the characteristics of the display device 610 from changing and the occurrence of shadow mura.

The light blocking layer 660 may be arranged to cover the upper portion of the fingerprint sensor 650 and the cushion layer 620 adjacent to the light leakage gap G together with the light leakage gap G region to prevent transmission of light.

The light blocking layer 660 may be formed of a resin material having a viscosity of 800 cps or less by spraying a light blocking layer material and curing the ultraviolet light. For example, the resin material may be an acrylic resin or a urethane acrylic resin, but is not limited thereto. The light blocking layer material may further include an initiator and a hydrated alumina in addition to the resin material. Black pigments may be added together so that the light transmittance is 10% or less. The thickness of the light blocking layer 660 may be 10 to 100 탆, but is not limited thereto.

The manufacturing process of the portable electronic device 600 including the light blocking layer 660 is described in Figs. 7A to 7D.

7A to 7D are cross-sectional views illustrating a manufacturing process of a portable electronic device in which a fingerprint sensor is disposed according to an embodiment of the present invention.

7A to 7D are substantially the same as or similar to those described in Figs. 1 to 6, and a detailed description thereof will be omitted.

Referring to FIG. 7A, a cushion layer 620 is disposed under the display device 610. The cushion layer 620 is provided on the lower surface of the display device 610 without an additional adhesive layer by applying an adhesive material to the entire surface of the cushion layer 620 to relieve impact when an external impact is applied to the display device 610. [ .

The cushion layer 620 is provided with a hole for disposing the fingerprint sensor 650 in a partial area below the display area A / A of the display device 610 and the hole for the fingerprint sensing area S / And the lower surface of the display device 610 is exposed.

7B, the optical or ultrasonic fingerprint sensor 650 is adhered and fixed to the lower surface of the adhesive layer 640 of the fingerprint sensor 650 and the lower surface of the display device 610. The optical or ultrasonic fingerprint sensor 650 is disposed in the fingerprint sensing area S / A under the display device 610.

Referring to FIG. 7C, a spray (S / P) is disposed at a position spaced apart from the light leakage gap G region between the fingerprint sensor 650 and the cushion layer 620, A light blocking layer 660 is formed by spraying a material made of resin. At this time, the light blocking layer 660 includes a light leakage gap G and a spray (S / P) in a region covering the upper portion of the fingerprint sensor 650 and the cushion layer 620 adjacent to the light leakage gap G And then sprayed. The thickness of the light blocking layer 660 is preferably 10 to 100 μm and may vary depending on the spraying speed or pressure of the spray (S / P). Therefore, the thickness of the spray (S / P) for forming the light blocking layer 660 The injection rate or pressure can be determined appropriately through preliminary experiments.

7D, a light blocking layer 660 made of a resin material is cured through ultraviolet rays (UV) emitted through an ultraviolet (UV) curing unit on top of a formed light blocking layer 660. In the embodiment of the present invention, the light-blocking layer 660 is a UV-curable resin, but the present invention is not limited thereto. For example, it may be a thermosetting resin.

The display device according to the embodiment of the present invention includes a display panel including a display area, a cushion layer disposed under the display panel, and a light blocking layer disposed between the fingerprint sensor and the cushion layer and the fingerprint sensor, And a hole disposed at the lower portion.

A back plate is further disposed on each of the display area bottom surface and the bending area lower surface of the display device according to the embodiment of the present invention, and the back plates oppose each other.

Between the display panel of the display device and the fingerprint sensor according to the embodiment of the present invention, an adhesive layer is included, and the fingerprint sensor is fixed by the adhesive layer.

The adhesive layer of the display device according to the embodiment of the present invention is composed of one of an optically transparent resin (OCR) or an optically transparent adhesive film (OCA film).

The cushion layer of the display device according to the embodiment of the present invention is composed of a shock-absorbing layer and a heat-radiating layer.

The light blocking layer of the display device according to the embodiment of the present invention is made of a resin material.

The resin material of the display device according to the embodiment of the present invention is an ultraviolet curing material.

The light blocking layer of the display device according to the embodiment of the present invention further includes black pigment.

The light transmittance of the light blocking layer of the display device according to the embodiment of the present invention is 10% or less.

The light blocking layer of the display device according to the embodiment of the present invention is disposed so as to cover the upper portion of the cushion layer and the fingerprint sensor.

A display device according to an embodiment of the present invention includes a step of forming a display panel including a display area, a step of disposing a cushion layer including a hole under the display panel, a step of disposing a fingerprint sensor in a hole area of the cushion layer, And forming a light blocking layer between the cushion layer and the fingerprint sensor.

The method further comprises disposing a cover glass on the display panel of the display device according to the embodiment of the present invention.

The step of disposing the fingerprint sensor of the display device according to the embodiment of the present invention includes the step of securing the fingerprint sensor by the adhesive layer disposed above the fingerprint sensor and below the display panel.

The adhesive layer of the display device according to the embodiment of the present invention is fabricated to be composed of one of an optically transparent resin (OCR) or an optically transparent adhesive film (OCA film).

The light blocking layer of the display device according to the embodiment of the present invention is fabricated to be made of a UV curing material.

The step of forming the light blocking layer of the display device according to the embodiment of the present invention includes a step of spraying a fingerprint sensor and a cushion layer on top of the fingerprint sensor, and a step of curing the light blocking layer by ultraviolet rays.

The light blocking layer of the display device according to the embodiment of the present invention is manufactured to further include black pigment (Black Pigment).

The light transmittance of the light blocking layer of the display device according to the embodiment of the present invention is made to be 10% or less.

The step of forming the light blocking layer of the display device according to the embodiment of the present invention includes a step of covering the upper portion of the cushion layer and the fingerprint sensor.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100, 200, 300, 400, 610: display device
110: image processor 120: timing controller
130: Data driver 140: Gate driver
150: display panel 160: pixel
220: gate line 230: data line
240: switching transistor 250: driving transistor
260: Compensation circuit
270, 440: Light emitting element
310, 410: substrate
370: circuit wiring 390: gate driver
395: Pad
420: thin film transistor 422: gate electrode
424: source electrode 426: drain electrode
428: Semiconductor layer
431: first insulation layer 433: second insulation layer
435: first planarization layer 437: second planarization layer
442: anode 444:
446: cathode 450: bank
452: spacer 460:
500, 600: Portable electronic device
620: Cushion layer
650: fingerprint sensor 640: sensor adhesive layer
660:
670: Cover Glass
A / A: display area N / A: non-display area
S / L: scan line S / A: sensing area
G: Light leakage gap S / P: Spray device

Claims (19)

A display panel including a display area;
A cushion layer and a fingerprint sensor disposed under the display panel; And
And a light blocking layer disposed between the cushion layer and the fingerprint sensor,
Wherein the cushion layer includes a hole disposed below the display area, and the fingerprint sensor is disposed in the hole, The method according to claim 1,
Wherein a back plate is further disposed on each of the bottom surface of the display area and the bottom surface of the bending area, and the back plates are opposed to each other. The method according to claim 1,
Wherein the display panel includes an adhesive layer between the display panel and the fingerprint sensor, and the fingerprint sensor is fixed by the adhesive layer. The method of claim 3,
Wherein the adhesive layer comprises one of an optically transparent resin (OCR) or an optically transparent adhesive film (OCA film). The method according to claim 1,
Wherein the cushion layer is composed of a shock-absorbing layer and a heat-radiating layer. The method according to claim 1,
Wherein the light blocking layer is made of a resin material. The method according to claim 6,
Wherein the resin material is an ultraviolet curing material. The method according to claim 6,
Wherein the light blocking layer further comprises black pigment. 9. The method of claim 8,
And the light transmittance of the light blocking layer is 10% or less. The method according to claim 1,
Wherein the light blocking layer is disposed so as to cover the cushion layer and an upper portion of the fingerprint sensor. Forming a display panel including a display area;
Disposing a cushion layer including holes at the bottom of the display panel;
Disposing a fingerprint sensor in the hole area of the cushion layer;
And forming a light blocking layer between the cushion layer and the fingerprint sensor. 12. The method of claim 11,
Further comprising disposing a cover glass on the display panel. 12. The method of claim 11,
Wherein the step of disposing the fingerprint sensor includes fixing the fingerprint sensor by an adhesive layer disposed on the fingerprint sensor and the lower portion of the display panel. 14. The method of claim 13,
Wherein the adhesive layer is composed of one of an optically transparent resin (OCR) or an optically transparent adhesive film (OCA film). 12. The method of claim 11,
Wherein the light blocking layer is made of an ultraviolet curing material. 12. The method of claim 11,
Wherein the step of forming the light blocking layer comprises the steps of: spraying the fingerprint sensor and the upper portion of the cushion layer with a spray; And curing the light blocking layer by ultraviolet light. 16. The method of claim 15,
Wherein the light blocking layer further comprises black pigment. 18. The method of claim 17,
Wherein the light transmittance of the light blocking layer is 10% or less. 12. The method of claim 11,
Wherein the forming of the light blocking layer includes disposing the cushion layer and the fingerprint sensor so as to cover the top of the fingerprint sensor.

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