Optical sensor and electronic device including same

Abstract

Disclosed are: an optical sensor in which the sensitivity of the optical sensor can be very precisely measured according to the intensity of an incident light source, including sunlight, regardless of a change in an incident angle by mitigating a change in sensitivity according to the incident angle of the optical sensor; and an electronic device including same. A first aspect of the present application may provide an optical sensor comprising: a sensor package including a light-receiving unit and a light-emitting body therein; the light-receiving unit positioned inside the sensor package and including a light-receiving element; a light-blocking unit spaced apart from the light-receiving unit and located above the light-receiving unit to block light; an ultraviolet pass filter located below or above the light-blocking unit and introducing ultraviolet light into the sensor package; the light-emitting body positioned inside the sensor package, and emitting light according to the intensity of the introduced ultraviolet light; and a boundary blocking unit surrounding a boundary line of a contact point between the ultraviolet pass filter and the sensor package, and blocking noise light.

Description

Optical sensor and electronic device including same

[0001] The present invention relates to a light sensor, and more particularly, to a light sensor that can measure the sensitivity of the light sensor according to the intensity of an incident light source, including sunlight, with great precision regardless of the change in the incident angle by mitigating the change in sensitivity according to the incident angle of the light sensor, and an electronic device including the same.

[0002] Ultraviolet rays generally refer to light with a short wavelength of 100 to 400 nm, and this region is further divided into UV-A (320 to 400 nm), UV-B (280 to 320 nm), and UV-C (100 to 280 nm). Specifically, ultraviolet rays with a wavelength of 400 nm or less are divided into several bands by wavelength according to the ISO 21348 standard.

[0003] In order to calculate the UV index, a sensor that can detect the amount of UV rays, such as an optical sensor, is required. Examples of optical sensors include semiconductor-type UV sensors based on inorganic materials such as silicon carbide (SiC), gallium nitride (GaN), indium gallium nitride (InGaN), and aluminum gallium nitride (AlGaN). Semiconductor-type UV sensors are configured to measure UV rays in a specific wavelength range according to electrical characteristics such as band gaps. However, commercial semiconductor-type UV sensors have a large measurement deviation due to the issue that the incident light energy per unit area varies depending on the incident angle, which limits the accurate calculation of the UV index.

[0004] Meanwhile, as an example of solving the problem of measurement deviation according to the incident angle, a technology is being used to reduce the measurement deviation according to the incident angle by attaching a wide-angle lens to the optical sensor. This is because the incident angle can be reduced by refraction of the incident light by attaching the wide-angle lens. However, although the relative sensitivity according to the incident angle can be maintained as the refractive index increases by using a wide-angle lens, the reflectivity on the lens surface may increase, which may reduce the absolute amount of light incident on the optical sensor. In addition, due to the attachment of the wide-angle lens, the size of the electronic device equipped with the optical sensor, such as an ultraviolet index measuring device, may increase, and there is a problem in that the thickness increases.

[0005] More specifically, conventional optical sensors are based on the principle of generating current in proportion to photon energy based on semiconductor materials such as silicon, and receive energy proportional to the orthogonal projection according to the incident angle, which decreases in proportion to the cosine angle (cosineθ) depending on the incident angle. Therefore, there is a problem that it is difficult to accurately measure the intensity of the light source depending on the change in the relative angle between the light source and the sensor surface. Therefore, in order to accurately measure the intensity of the accurate light source, there is a need to have a separate device that adjusts the incident angle. In the case of a large system, the incident angle problem can be solved by installing an additional device, or the sensor surface can be adjusted vertically according to the position of the light source or the sun. However, in a system that requires miniaturization, it is difficult to have such a separate device.

[0006] For example, Fig. 1 is a graph showing the sensitivity measured by the optical sensor according to the angle of light incident on the optical sensor. Referring to Fig. 1, the problem of sensitivity change according to the change in incident angle will be described in detail. As in Fig. 1 (a), a general optical sensor theoretically has a sensitivity proportional to the cosine angle value for the sensitivity at an incident angle of 0 degrees, depending on the incident angle of light. However, an optical sensor such as the semiconductor-type ultraviolet sensor described above has a very narrow field of view (FOV) due to the effects of reflection and scattering, so that the sensitivity decreases rapidly when the incident angle of light increases even slightly. To explain this in more detail, as in Fig. 1 (b), the sensitivity is detected to be the highest when the incident angle of ultraviolet light is 0 degrees with respect to the front of the optical sensor, but when the incident angle at which the ultraviolet light is incident on the surface of the optical sensor deviates within ±15 degrees, the sensitivity begins to decrease rapidly. In addition, when the incident angle of ultraviolet rays incident on the surface of the light sensor is ±15 to ±30 degrees, the detection sensitivity of the light sensor decreases rapidly, and when it exceeds ±30 degrees, the value detected by the light sensor approaches 0 and the sensitivity is lost. In other words, if the direction of propagation of light incident on the light sensor is not maintained perpendicular to the surface of the light sensor (incident angle 0 degrees), there is a problem in that the value of ultraviolet rays cannot be accurately detected.

[0007] Meanwhile, a method of mitigating sensitivity changes by using a wide-angle lens to adjust the angle of incidence of light so that it can enter the light sensor is being used. As an example, FIG. 2 is an example diagram of a device that applies the effect of reducing the angle of incidence to the sensor by using the refractive index of a hemisphere. In this case as well, as described above, a wide-angle lens (2) is provided to maintain the direction of propagation of light incident on the light sensor (1) vertical, but the wide-angle lens (2) is formed convexly while covering the light sensor (1), making it difficult to use it in electronic devices, especially in small, slim electronic devices.

[0008] Furthermore, Korean Patent No. 10-2301395 relates to an “optical sensor and an electronic device including the same,” and more specifically, discloses an optical sensor including an optical waveguide containing a photosensitive material; a light-emitting element that irradiates visible light onto the optical waveguide; and a light-receiving element that detects visible light emitted from the light-emitting element and propagated through the optical waveguide, and an electronic device including the same. The optical sensor utilizes the principle that the transmittance of the optical waveguide to visible light changes due to the photosensitive material when exposed to ultraviolet light. However, this technology uses an optical waveguide containing a photosensitive material as a basic component, and since this optical waveguide essentially uses a light-emitting element such as a light-emitting diode (LED), power is consumed for measuring ultraviolet intensity, and the accuracy of repeated measurements decreases depending on the deterioration of organic materials, and there are still problems such as the size of the sensor, the need for power supply, and sustainability.

[0009] As a related invention to solve these problems, Korean Patent No. 10-2519070 relates to 'optical sensor and electronic device including same', and provides an excellent technology for an optical sensor module in which the sensitivity does not change significantly depending on the change in the angle between the angle of the incident light entering the optical sensor and the sensor surface of the optical sensor. The inventor of the present invention has, through continuous research on an ultraviolet sensor for the related invention, achieved the present invention by measuring the intensity of ultraviolet light more precisely, minimizing the change in sensitivity depending on the change in the angle of the incident light, and resolving the problem in the manufacturing process of the ultraviolet sensor.

[0010] The present invention was devised to solve the above-mentioned problems, and aims to provide a light sensor and an electronic device including the same that can measure the intensity of ultraviolet rays more sensitively and more precisely by blocking noise light sources entering the light sensor.

[0011] And the present invention aims to provide a light sensor and an electronic device including the same that can minimize changes in sensitivity according to changes in the angle of incident light entering the light sensor and the angle between the light sensor and the sensor.

[0012] In addition, the present invention aims to provide an optical sensor with maximized stability and an electronic device including the same by resolving problems that may arise during the curing process of the optical sensor or the attachment process to an electronic product.

[0013] In order to achieve the above object, a first aspect of the present invention provides an optical sensor including: a sensor package including a light receiving portion and a light emitting portion therein; a light receiving portion located inside the sensor package and including a light receiving element; a light blocking portion located above the light receiving portion and at a distance from the light receiving portion to block light; an ultraviolet ray pass filter located below or above the light blocking portion and allowing ultraviolet ray light to enter the sensor package; a light emitting portion located inside the sensor package and emitting light according to the intensity of the entering ultraviolet ray; and a boundary blocking portion surrounding a contact boundary between the ultraviolet ray pass filter and the sensor package to block noise light.

[0014] In one embodiment of the present invention, the sensor package may have an internal shape of a hexahedron or a cylinder, but is not limited thereto.

[0015] In one embodiment of the present invention, the light-blocking portion may have a light transmittance of 20 to 40%, but is not limited thereto.

[0016] In one embodiment of the present invention, the light blocking portion may be in the shape of a disk or a square plate, but is not limited thereto.

[0017] In one embodiment of the present invention, the light blocking portion may be formed symmetrically and sequentially in a radial shape while being positioned above or below the ultraviolet ray passing filter, but is not limited thereto.

[0018] In one embodiment of the present invention, the light blocking unit may be formed by forming a first light blocking unit on an upper portion of the light receiving unit, forming a first ultraviolet light inlet in connection with the first light blocking unit, and forming a second light blocking unit in connection with the first ultraviolet light inlet, but is not limited thereto.

[0019] In one embodiment of the present invention, the light-emitting body may be at least one selected from the group consisting of nano quantum dots, perovskite quantum dots, and fluorescent bodies, but is not limited thereto.

[0020] In one embodiment of the present invention, the light-emitting body may be a filled type or a film type, but is not limited thereto.

[0021] In one embodiment of the present invention, the light-emitting body may be film-type, and the sensor package may additionally include a vent hole passing from the inside of the sensor package to the outside of the sensor package, but is not limited thereto.

[0022] A second aspect of the present invention may provide an electronic device including the optical sensor of the first aspect of the present invention.

[0023] According to the present invention, noise light for measuring ultraviolet intensity is completely blocked, and the change in measurement sensitivity that changes depending on the incident angle of sunlight is resolved, thereby providing an optical sensor with excellent sensitivity regardless of the incident angle of sunlight.

[0024] In addition, since the sensor of this device is a passive element, it does not consume energy during measurement and its algorithm is simple, which can reduce the burden on the microcontroller (MCU) and provide an effect that is very suitable for miniaturizing the sensor.

[0025] Furthermore, it can contribute to maintaining sensor accuracy and improving durability by resolving stability issues of sensor components that may arise during the sensor manufacturing process and attachment process.

[0026] Figure 1 is a graph showing the sensitivity measured by the light sensor according to the angle of light incident on the light sensor.

[0027] Figure 2 is an example of a device that applies the effect of reducing the incident angle to a sensor by using the refractive index of a hemisphere.

[0028] Figure 3 is an exploded perspective view of the optical sensor of the present invention according to an embodiment of the present invention.

[0029] Figure 4 is a perspective view of the combination of Figure 3 ((a) of Figure 4) and a cross-sectional perspective view of II' ((b) of Figure 4).

[0030] Figure 5 is an example of a light sensor without a boundary barrier (Figure 5 (a)) and an example of a light sensor of the present invention with a boundary barrier (Figure 5 (b)).

[0031] Figure 6 is a conceptual diagram of the operating principle of the optical sensor of the present invention in a state where there is no boundary blocking part.

[0032] Figure 7 is a perspective view, side view and cross-sectional view showing the type of sensor package shown excluding the boundary blocking part.

[0033] Figure 8 is a conceptual diagram showing the problem in a state where there is no boundary blocking section.

[0034] Figure 9 is a drawing showing an example of an optical sensor with a boundary blocking portion formed.

[0035] Figure 10 is a perspective view ((a) of Figure 10) of a sensor package having a cylindrical internal shape according to an embodiment of the present invention, and a perspective view ((b) of Figure 10) of a combination thereof.

[0036] Figure 11 is an example of a structure in which a light blocking part has a radial shape according to an embodiment of the present invention.

[0037] Figure 12 is a graph showing the phenomenon of the light energy sensitivity jumping according to the change in the incident angle when the light transmittance is 0%.

[0038] Figure 13 is a conceptual diagram of the operating principle of the optical sensor of the present invention when the light blocking part has a transmittance of less than 40% according to one implementation example of the present invention.

[0039] Figure 14 is a graph showing the results of observing sensitivity data while adjusting light transmittance using a chrome material according to one implementation example of the present invention.

[0040] Figure 15 is an example of a method for manufacturing a sensor package.

[0041] Figure 16 is a conceptual diagram of a light sensor of the present invention that uses a film-type light-emitting body according to an embodiment of the present invention.

[0042] Figure 17 is a conceptual diagram of an optical sensor of the present invention that uses a sensor package including a vent hole according to an embodiment of the present invention.

[0043] Hereinafter, the present invention will be described in detail with reference to the attached drawings and implementation examples or embodiments so that a person having average knowledge in the technical field pertaining to the present invention can easily reproduce the present invention.

[0044] The present invention may be implemented in many different forms and is not limited to the implementation examples and embodiments described herein.

[0045] Throughout this specification, whenever a part is said to “include” a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0046] Throughout this specification, when a part is said to be “connected” with a component, this includes the meaning that the problem-solving principle may be substantially the same as that of the combined part, even if there are parts to which other components may be added, or that the part is indirectly connected.

[0047] Throughout this specification, when a step is said to be located “before” or “after” another step, this includes not only cases where the step is directly connected to the other step, but also cases where another step exists between the two steps.

[0048] The terms “about,” “substantially,” and the like used throughout this specification are used in a meaning that is at or close to the numerical value when manufacturing and material tolerances inherent to the meaning referred to are presented, and are used to prevent unscrupulous infringers from unfairly exploiting the disclosure in which exact or absolute numerical values ​​are mentioned to aid understanding of the present invention.

[0049] The terms “step of” or “step of” used throughout this specification do not mean “step for”.

[0050]

[0051] FIG. 3 is an exploded perspective view of the optical sensor of the present invention according to an embodiment of the present invention, FIG. 4 is a combined perspective view (FIG. 4(a)) and a II' cross-sectional perspective view (FIG. 4(b)) of FIG. 3, FIG. 5 is an example of an optical sensor without a boundary blocking portion (FIG. 5(a)) and an example of an optical sensor of the present invention with a boundary blocking portion (FIG. 5(b)), and FIG. 6 is a conceptual diagram of the operating principle of the optical sensor of the present invention in a state without a boundary blocking portion, and the present invention will be described in detail with reference to FIGS. 3 to 6, a first aspect of the present invention includes: a sensor package (100) including a light receiving portion (200) and a light emitting body (500) therein; a light receiving portion (200) positioned inside the sensor package and including a light receiving element (210); a light blocking portion (300) positioned above the light receiving portion and spaced apart from the light receiving portion to block light; An optical sensor can be provided, including: an ultraviolet ray pass filter (400) positioned at the lower or upper portion of the light blocking portion and introducing ultraviolet ray into the sensor package; a light emitting body (500) positioned at the inner portion of the sensor package and emitting light according to the intensity of the incoming ultraviolet ray; and a boundary blocking portion (600) surrounding the contact boundary line (see B of FIG. 8) of the ultraviolet ray pass filter (400) and the sensor package (100) and blocking noise light.

[0052]

[0053] The above sensor package (100) serves as a frame of a light sensor and includes a light receiving unit (200) and a light emitting unit (500), and the upper part of the sensor package can be sealed in connection with a light blocking unit (300) or an ultraviolet ray passing filter (400).

[0054] In one embodiment of the present invention, the sensor package may have an internal shape of a hexahedron or a cylinder, but is not limited thereto.

[0055] The sensor package (100) may be configured such that the side portion (110) and the bottom portion (120) are integrally formed or separated, and as an example, both may be formed of a material that does not transmit light, such as an opaque epoxy resin. In another embodiment, the side portion (110) may be formed of an opaque epoxy resin, and the bottom portion (120) may be formed of a circuit board on which a circuit including the light-receiving element (210) or a ROIC (220) is mounted, and the bottom portion is not particularly limited. The circuit board may be an insulating board or a conductive board, may include a conductive pattern, and is not limited as long as it is a board that can support the light-receiving unit. In an exemplary embodiment, the circuit board may be a printed circuit board (PCB), and may further include terminals that can be connected to the light-receiving unit (200) and the outside.

[0056]

[0057] FIG. 7 is a perspective view and a side view or a cross-sectional view showing the types of sensor packages shown excluding the boundary blocking portion. The sensor package (100) may use a general type package in which the upper edge of the sensor side portion (110) is covered by an ultraviolet ray pass filter as in FIG. 7(a), or may be a bezel type sensor package in which the upper edge (111) of the sensor package is exposed as in FIG. 7(b), but is not particularly limited thereto.

[0058]

[0059] The light receiving unit (200) detects light emitted by a light emitter (500) activated by ultraviolet (UV) rays that enter the sensor package (100) through an ultraviolet pass filter (400), and may include a light receiving element (210) such as a photo diode (PD), but is not particularly limited thereto. The light receiving unit (200) has the characteristic of being located inside the sensor package (100) and below a light blocking unit (300). The light receiving unit (200) may further include a readout integrated circuit (ROIC; 220) including a light receiving element (210) such as the aforementioned photo diode (PD), and the ROIC (220) converts a current value generated from the light receiving element (210) into a digital value (ADC; Analog to Digital Converting).

[0060]

[0061] The above light blocking part (300) serves to block all or part of external light such as sunlight by covering the upper part of the light receiving part (200), and is characterized by being located at the upper part of the sensor package (100).

[0062] In one embodiment of the present invention, the light blocking portion (300) may be in the shape of a circular plate or a square plate, and may be configured similarly to the shape of the sensor package, and is not particularly limited thereto.

[0063] As a material for the above light blocking part (300), for example, metal materials such as platinum (Pt), gold (Au), silver (Ag), chromium (Cr), nickel (Ni), aluminum (Al), copper (Cu) and alloys thereof can be used, and a polymer material colored to be opaque to visible light and ultraviolet rays can be used.

[0064]

[0065] In one embodiment of the present invention, the light blocking portion (300) may have a light transmittance of 0 to 40% or 20 to 40%, but is not limited thereto. When the light transmittance is 0%, it means that all light such as visible light, infrared rays, and ultraviolet rays are blocked and do not directly excite the light emitting body located above the light receiving portion, and when the light transmittance is less than 40%, it means that less than 40% of external light is transmitted.

[0066] Light passing through the light blocking section with a light transmittance of less than 40% enters the sensor package through the ultraviolet-pass filter, and only ultraviolet light enters, directly exciting the light emitting element located above the light receiving section. The technical significance of the light blocking section having a light transmittance of less than 40% will be explained in detail below.

[0067]

[0068] The light transmittance of the light blocking portion (300) can be adjusted depending on the refractive index and density of the material of the light blocking portion. In one embodiment of the present invention, the light blocking portion (300) may have a thickness of 5 nm to 5 μm, but is not limited thereto. When the thickness of the light blocking portion is less than 5 nm, the light blocking ability of the light source into the sensor package may be reduced, and when it exceeds 5 μm, there may be a problem that the light blocking portion may be peeled off during the manufacturing process of the sensor, in which case there is a significance in the numerical limitation. In another embodiment, the light blocking portion is formed with a thickness of 5 to 40 nm using a material of chromium (Cr), so that the light transmittance can be adjusted to 20 to 40%. The remarkable effect on the accuracy of ultraviolet measurement for this will be described in detail again below.

[0069]

[0070] The above UV band pass filter (UV band pass filter; 400) blocks visible light and infrared rays and allows ultraviolet light (UV) to enter the sensor package (100). The light blocking portion may be formed on the upper or lower surface of the UV band pass filter, and is not particularly limited thereto.

[0071] In one embodiment of the present invention, when the light transmittance of the light blocking portion is 0%, the light blocking portion is located on the upper or lower surface of the ultraviolet ray pass filter, so that ultraviolet ray is introduced into the sensor package through the ultraviolet ray light inlet (410), which is a portion without the light blocking portion, and the introduced ultraviolet ray scatters light through the light-emitting body, and the light-receiving portion stably measures the ultraviolet ray value based on the data value scattered in this way.

[0072] As another embodiment of the present invention, when the light transmittance of the light blocking portion is more than 0% and less than 40%, only ultraviolet rays (see UV2 of FIG. 13) are introduced into the sensor package when the light passing through the light blocking portion passes through the ultraviolet pass filter, and this causes a smaller amount of ultraviolet rays to be introduced than the amount of ultraviolet rays (see UV1 of FIG. 13) introduced into the ultraviolet light inlet (410), which is a portion without the light blocking portion, and scatters the light emitting body above the light receiving portion.

[0073]

[0074] The above light emitting body (500) is located in the internal space of the sensor package (100), and performs the role of emitting light whose wavelength is converted when the energy state is excited by ultraviolet rays flowing into the sensor package (100) and then falls back to the ground state.

[0075] In one embodiment of the present invention, the light-emitting body may be a filling-type light-emitting body that fills an empty space in the sensor package where the light-receiving unit is located, or a film-type light-emitting body (see FIG. 16 or FIG. 17) located above the light-receiving unit, and is not particularly limited thereto.

[0076]

[0077] In one embodiment of the present invention, the light-emitting body may be at least one selected from the group consisting of nano quantum dots (QDs), perovskite quantum dots, and fluorescent substances, but is not limited thereto.

[0078] To explain in more detail, nano-quantum dots can be used as the light-emitting body of the present invention, and the nano-quantum dots (QDs) are nano-crystals having a diameter of about 1 to 10 nm and are formed of a semiconductor material to induce a quantum confinement effect. The nano-quantum dots absorb the wavelength of ultraviolet light entering the sensor package by electrons inside the quantum dots, become a high energy state, and then fall to the ground state, where electrons and holes recombine to form excitons and emit wavelength-converted light, that is, fluorescent light. The present invention measures the light emitted by the nano-quantum dots excited by the ultraviolet light by a light-receiving unit. The nano-quantum dots used in the present invention can use silicon (Si)-based nano-crystals, II-VI compound semiconductor nano-crystals, III-V compound semiconductor nano-crystals, and IV-VI compound semiconductor nano-crystals, but are not particularly limited thereto.

[0079]

[0080] For example, the quantum dots can be one or a mixture of the above-described examples, in which case the II-VI compound semiconductor nanocrystals can be formed of one selected from the group consisting of, for example, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HggZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe. There are. The III-V group compound semiconductor nanocrystals can be formed of, for example, one selected from the group consisting of GaN, GaP, GaAs, AlN, AlP, AlAs, InN, InP, InAs, GaNP, GaNAs, GaPAs, AlNP, AlNAs, AlPAs, InNP, InNAs, InPAs, GaAlNP, GaAlNAs, GaAlPAs, GaInNP, GaInNAs, GaInPAs, InAlNP, InAlNAs, and InAlPAs. The IV-VI group compound semiconductor nanocrystals can be formed of, for example, SbTe.

[0081] The above nano-quantum dots generate stronger light in a narrower wavelength band than general phosphors. Thus, green light-generating quantum dots may have a full-width half-maximum (FWHM) of 10 to 60 nm, and red light-generating quantum dots may have a FWHM of 30 to 80 nm. In one embodiment of the present disclosure, green light-generating quantum dots may be preferably used.

[0082]

[0083] An exemplary embodiment of the light-emitting body of the present invention may be a perovskite quantum dot, and the perovskite quantum dots can be expressed by the following [chemical formula 1].

[0084] [Chemical Formula 1]

[0085] ABX3-nX'n

[0086] In the above chemical formula 1, A is at least one selected from organic ammonium, organic amidinium, and alkali metal, B is at least one selected from divalent transition metal, rare earth metal, alkaline earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi, Po, and organic material, X and X' are each independently at least one selected from F, Cl, Br, and I, and 0 ≤ n ≤ 3.

[0087] For example, the inorganic perovskite quantum dot may be a material such as [chemical formula 2].

[0088] [Chemical Formula 2]

[0089] ABX3

[0090] In the above chemical formula 2, A is one monovalent metal selected from cesium (Cs), rubidium (Rb), barium (Ba), indium (In), potassium (K), sodium (Na), copper (Cu), and lithium (Li), B is one divalent metal selected from cobalt (Co), nickel (Ni), iron (Fe), manganese (Mn), chromium (Cr), copper (Cu), tin (Sn), palladium (Pd), ytterbium (Yb), and lead (Pb), and X may be one halogen element selected from F, Cl, Br, and I. As a specific example, the perovskite quantum dot represented by chemical formula 2 may be a CsPbI3 perovskite quantum dot.

[0091] Such perovskite quantum dots may have a suitable shell or coating for passivation and / or environmental protection, but are not particularly limited thereto.

[0092]

[0093] As an exemplary embodiment of the light-emitting body of the present invention, a phosphor can be used, and the phosphor can use materials such as indium, gallium, nitrogen, phosphorus, YAG, TAG, and silicate series. The phosphor plays a role of absorbing short wavelengths and emitting light of relatively long wavelengths, and shows optical properties similar to nano-quantum dots, but the particles are larger than nano-quantum dots, so there is a lot of scattering of light such as visible light and ultraviolet rays, the wavelength range of the emitted light is somewhat wider, and it has a low price. The red phosphor is composed of M2Si5N8:Eu2+(M=Ca,Sr,Ba,258phase), MAlSiN3:Eu2+(M=Ca,Sr), the green phosphor is composed of nitride series such as M-SiON series and SiAlON series, and the yellow phosphor is composed of oxide series composition such as YAG and oxynitride α-SiAlON:Eu2+ composition.

[0094]

[0095] Referring to FIG. 6, the operating principle of the optical sensor of the present invention will be described in detail. Rather than a principle in which the light receiving unit (200) directly measures the amount of ultraviolet rays entering through the ultraviolet pass filter (400), the light receiving unit measures the amount of luminescence energy emitted by the light emitting unit (500) such as a fluorescent substance and nano quantum dots or perovskite quantum dots when ultraviolet rays enter through the ultraviolet pass filter (400) and converts it into the intensity of ultraviolet rays.

[0096] More specifically, the sensitivity of the light (Fluorescent Light; FL) formed when an excited light-emitting body (500), such as a nano quantum dot, a perovskite quantum dot, or a fluorescent body, emits light due to ultraviolet (UV) rays entering the inside of the sensor package through an ultraviolet pass filter (400) can be more accurately measured by a light receiving unit, and the deviation in ultraviolet measurement can be reduced regardless of the position (incident angle) of the sun, and an optical sensor can be provided in which the sensitivity does not change significantly depending on the angle between the angle of the incident light entering the optical sensor and the sensor surface of the optical sensor. This is a method for overcoming the characteristic of decreasing in proportion to the cosine angle value depending on the incident angle of light, and is a feature of the present invention.

[0097]

[0098] First, referring to Fig. 6, a detailed description will be given of the case where the light blocking portion is 0%. The sunlight directed toward the sensor is prevented from entering the sensor package (100) by the light blocking portion (300) having a light transmittance of 0%, such as visible light (VL) or ultraviolet light (UV), and the light emitting element above the light-receiving element (210) does not directly emit light. However, ultraviolet light (UV) enters the sensor package through the inlet (410) of the UV-pass filter that is not blocked by the light blocking portion. At this time, the introduced ultraviolet light (UV) activates the light emitting element (500) inside the sensor package (100), and at this time, the light emitting element (500) emits converted fluorescence (FL; FL 1 or FL 2). The light (FL; Fluorescent Light) emitted by the light source is transmitted to the light receiving portion (200) in two ways. The light (FL 1) emitted by the light source located above the light receiving element (210) inside the sensor package is directly transmitted to the light receiving portion (210) (direct transmission of light emission), and the light (FL 2) emitted by the light source located further away from the light receiving element (210) is indirectly transmitted to the light receiving portion through reflection from the inner wall surface of the sensor package (indirect transmission of light emission).

[0099] When the optical sensor of the present invention having this principle is explained by applying it when the incident angle of sunlight changes, as in (a) of FIG. 6, when the incident angle of sunlight is 0 degrees, light is blocked by the light blocking part (300) directly above the light-receiving element (210), and ultraviolet rays enter the sensor package through the ultraviolet light inlet (410) of the ultraviolet pass filter (400) next to the light blocking part, so when the incident angle of sunlight is small, the light emitted around the light-receiving element (FL 2; indirectly transmitted light emitted) is greater than the light emitted from the upper part of the light-receiving element (FL 1; direct transmitted light emitted), so that overall, a relatively large amount of indirectly transmitted light (FL 2) and a relatively small amount of direct transmitted light (FL 1) are applied together to measure the sensitivity at the light-receiving unit, which solves the problem of sensitivity deviation that occurs based on the large sensitivity of the conventional optical sensor at an incident angle of 0 degrees.

[0100]

[0101] And as shown in (b) of FIG. 6, when the incident angle of sunlight increases, the light emitted from the upper part of the light-receiving element (FL 1; luminescent direct transmission light) gradually increases, and the light emitted around the light-receiving element (FL 2; luminescent indirect transmission light) gradually decreases (see the change in the thickness of the arrows of FL 1 and FL 2). Since the 'luminescent direct transmission light (FL 1)' has greater energy than the 'luminescent indirect transmission light (FL 2)' of the inner wall, the intensity of the light entering the light-receiving element (210) in the sensor package is maintained without significantly changing even though the incident angle of the sun increases. With this feature, the optical sensor of the present invention can accurately measure the sensitivity at a constant level regardless of the altitude of the sun. Based on this principle, the optical sensor of the present invention solves the problem that the sensitivity of a general conventional optical sensor is high when the incident angle is 0 degrees and the sensitivity rapidly decreases as the incident angle increases, that is, it receives energy proportional to the orthogonal projection depending on the incident angle, so that the cosine of the incident angle is increased. This solves the problem of decreasing in proportion to the angle (cosineθ) value.

[0102]

[0103] With continued reference to FIGS. 3 and 8, as one feature of the present invention, a boundary blocking portion (600) that blocks noise light by surrounding the contact boundary line (see B of FIG. 8) of the ultraviolet ray passing filter (400) and the sensor package (100) will be described in detail.

[0104]

[0105] Fig. 8 is a conceptual diagram showing a problem in a state where there is no boundary blocking portion. Referring to Figs. 3, 5, and 8, the boundary blocking portion of the present invention will be described in detail. As shown in Fig. 8, the inside of the optical sensor is closed when the sensor package (100) and the ultraviolet ray pass filter are combined, and no light other than ultraviolet ray should enter the inside of the sensor package.

[0106] However, in the case of a general sensor package as an example, as in (a) of FIG. 8, and in the case of a bezel-type sensor package as in (b) of FIG. 8, there is a problem that external light such as sunlight flows into the interior of the sensor package through the contact boundary line (B) where the sensor package (100) and the ultraviolet ray pass filter (400) are combined, and the noise light thus introduced acts as a noise value in the light emission of the light-emitting body. In order to solve this problem, the present invention is characterized by forming a boundary blocking portion (600) as in FIG. 9.

[0107]

[0108] Fig. 9 shows an example of an optical sensor having a boundary blocking portion formed. Depending on the shape of the contact boundary between the sensor package and the ultraviolet ray pass filter, one of a side blocking form (Fig. 9 (a)), an upper blocking form (Fig. 9 (b)), or a clip blocking form (Fig. 9 (c)) can be selected.

[0109] The above boundary blocking member may be, for example, a metal material such as platinum (Pt), gold (Au), silver (Ag), chromium (Cr), nickel (Ni), aluminum (Al), copper (Cu) and alloys thereof, or a polymer material colored to be opaque to visible light and ultraviolet rays, and is not particularly limited as long as it is a type that completely blocks light.

[0110]

[0111] <Comparative Example 1>

[0112] The inside of the sensor package was filled with nano quantum dots having a green wavelength (wavelength 520 to 540 nm), and 10 sensors without boundary barriers (ID 1 to 10) were manufactured, and the electric signal value of light measured inside the sensor package was confirmed, and the results are shown in [Table 1] below.

[0113]

[0114] <Example 1>

[0115] Under the same conditions as Comparative Example 1 above, a boundary barrier was installed on the above sensor and the electric signal value of light measured inside the sensor package was confirmed, and the results are shown in [Table 2] below.

[0116]

[0117] <Electrical signal values ​​generated by light of each wavelength in Comparative Example 1>

[0118] ID12345678910Red1098411261576246426286Green10312710515814415511091142158Bl ue739066951033346164112132Clear216325229312275680262177316241IR233443314513

[0119] <Electrical signal values ​​generated by light of each wavelength in Example 1>

[0120] ID12345678910Red2333223323Green51514950545148495151Blue14151515151415141414Clear56595455595854525555IR0110011101

[0121] As can be seen from the electric signal values ​​generated by light by wavelength inside the sensor package as shown in [Table 1] and [Table 2] above, in the case of Comparative Example 1, external sunlight enters through the contact boundary and acts as high noise compared to the green value emitted by the nano quantum dots by ultraviolet rays, resulting in the green value emitted by the nano quantum dots being covered by the noise.

[0122] However, in the case where there is a boundary blocking portion as in Example 1, it can be confirmed that the green channel has a signal-to-noise ratio (SNR) that is approximately 20 times higher than that of the red channel, which indicates that the present invention can perform more precise and stable ultraviolet measurement.

[0123]

[0124] More specifically, comparing the signal values ​​of the Red channel in [Table 1] and [Table 2] above, the signal values ​​show a difference of about 50 times depending on the presence or absence of the boundary blocking part, which allows us to confirm the external visible light blocking effect of the boundary blocking part. In addition, the reason the Blue channel shows only a difference of about 10 times is because the wavelengths of the blue series of ultraviolet rays and visible light entering through the optical filter are adjacent and are not filtered as well as the red series.

[0125] The green channel has almost no visible light value outside due to the presence of a boundary cutoff like the red series, but the nano quantum dots inside the sensor show a signal value of about 50 when they are illuminated by ultraviolet rays, so the signal value compared to the noise is about 25 times higher, showing very stable results.

[0126]

[0127] In one embodiment of the present invention, the sensor package may have an internal shape of a hexahedron or a cylinder, but is not limited thereto, and the sensor package may be designed so that the shape of the optical sensor when viewed from above may have a square or circular shape, but is not limited thereto. In the present invention, FIGS. 1 to 9 illustrate an example in which the internal shape is a hexahedron, and FIG. 10 illustrates an exploded perspective view (FIG. 10 (a)) and a combined perspective view (FIG. 10 (b)) of a sensor package according to one embodiment of the present invention in which the internal shape is a cylinder.

[0128]

[0129] In Fig. 10, and particularly as shown in (b) of Fig. 10, when the internal shape of the sensor package (100) is cylindrical, even when the sensor is mounted on an electronic product and rotates at an arbitrary angle according to the movement of the electronic product, the amount of ultraviolet light entering the interior of the sensor package can be maintained constant at any angle, so that the intensity of ultraviolet light can be precisely measured in all directions.

[0130]

[0131] In one embodiment of the present invention, the light blocking unit (300) may be in the shape of a disk or a square plate, but is not limited thereto. As shown in FIG. 10, the interior of the sensor package may be cylindrical, the light blocking unit may be in the shape of a disk, and these may be combined to manufacture a sensor. However, in one embodiment of the present invention, the interior of the sensor package (100) may be cubic, and the light blocking unit (300) may be in the shape of a disk or a square plate, but is not particularly limited thereto. Furthermore, in one embodiment of the present invention, the light blocking unit (300) may be formed symmetrically and sequentially in a radial shape while being positioned above or below the ultraviolet light transmission filter (400), but is not particularly limited thereto.

[0132]

[0133] FIG. 11 is an exemplary diagram of a structure in which a light blocking unit (300) according to one embodiment of the present invention has a radial shape. Referring to FIG. 11, the present invention will be described in detail. In one embodiment of the present invention, the light blocking unit (300) may form a first light blocking unit (310) on the upper portion of the light receiving unit, form a first ultraviolet light inlet (411) by being connected to the first light blocking unit, and form a second light blocking unit (320) by being connected to the first ultraviolet light inlet, but is not limited thereto.

[0134]

[0135] As shown in Fig. 11, while maintaining the advantages of lowering the manufacturing cost and minimizing the size of the sensor by using a rectangular parallelepiped interior, the upper light-blocking part is configured radially, the first light-blocking part is configured in a disk shape, and the first ultraviolet light inlet is formed at a portion connected to the first light-blocking part, the amount of ultraviolet light entering the interior of the sensor package can be maintained constant at any angle even when the sensor is rotated at any angle, and thus, similar to the sensor exemplarily presented in Fig. 10, the advantage of being able to precisely measure the intensity of ultraviolet light in all directions can be provided.

[0136] Meanwhile, the above-described details have been described in detail as an example of a case where the light blocking part has a light transmittance of 0%, but the light blocking part of the present invention may be characterized by a light transmittance of 20 to 40%, but is not limited thereto.

[0137]

[0138] As explained above in the operating principle of the sensor of the present invention, as shown in Fig. 6, since the upper part of the light-receiving part is blocked by the light-blocking part, if there is no light-emitting body, the upper part of the light-receiving part remains covered by the shadow of the light-blocking part. However, there may be a problem that the light (FL2 and FL1) emitted by the light-emitting body of the present invention when it receives ultraviolet rays coming in through the ultraviolet pass filter is indirectly transmitted from the part directly above the light-receiving part, but the sensitivity of the light-receiving element relatively jumps the moment the light-receiving element is out of the shadow of the light-blocking part. The present invention is characterized by solving this problem by controlling the light transmittance of the light-blocking part.

[0139]

[0140] Fig. 12 is a graph showing a phenomenon in which light energy sensitivity jumps according to a change in the incident angle when the light transmittance is 0%. Referring to Fig. 12, a phenomenon in which the light energy distribution changes suddenly occurs when the incident angle of sunlight is around 10 degrees, and this 10 degree position can be seen as the moment when the light-receiving element in the shadow of the light-blocking part comes out of the shadow. In order to prevent such a phenomenon of sudden change in light energy, the light-blocking part (300) of the present invention adopts a material having a light transmittance of less than 40% so that the light-emitting body (500) located directly above the light-receiving element (210) emits light, so that even if it comes out of the shadow, the light energy recognized by the light-receiving element does not suddenly change.

[0141]

[0142] FIG. 13 is a conceptual diagram of the operating principle of the sensor of the present invention when the light blocking portion has a transmittance of less than 40% according to an embodiment of the present invention. The present invention will be described in more detail with reference to FIG. 13. As described above in FIG. 6, external light is generated by a light emitter emitting ultraviolet light (UV1) that is not covered by the light blocking portion (300) and that enters through the ultraviolet light inlet (410). There are two types of light (FL; Fluorescent Light), and the light can be divided into light (FL 2) emitted from a position far from the light receiving element and light (FL 1) emitted from a position close to the light receiving element (210). The principle of measuring ultraviolet light is explained through the value measured by the sum of these two lights (FL1+FL2). Going one step further, when the light transmittance of the above-mentioned light blocking portion is less than 40%, the phenomenon of the light energy value suddenly jumping as in Fig. 12 can be resolved by using the light (FL 3) emitted by the light emitter located directly above the light receiving element by ultraviolet rays (UV2) that pass through the light blocking portion and enter the sensor.

[0143]

[0144] In one embodiment of the present invention, the light blocking part (300) may have a light transmittance of 20 to 40%, but is not limited thereto. Fig. 14 is a graph showing the results of observing sensitivity data while adjusting the light transmittance using a chrome material according to one embodiment of the present invention. As can be seen in Fig. 14, unlike when ultraviolet rays are completely blocked, when the light transmittance of the light blocking part (300) is allowed at a certain ratio, it can be observed that the phenomenon of data jumping rapidly is suppressed. Furthermore, in the case of the chrome material, when the thickness of the light blocking part (300) is 5 to 40 nm and the light transmittance is 20 to 40%, it can be confirmed that the optimal condition is that the sensitivity data increases and decreases gradually with almost no change.

[0145]

[0146] FIG. 15 is an exemplary diagram of a method for manufacturing a sensor package. Referring to FIG. 15, the light-emitting body of the present invention can be manufactured in a form that surrounds the light-receiving unit (200) and is filled inside the sensor package, as in the previously presented embodiment, and in this case, the light-emitting body (500) is mixed and filled in a resin (resin; 510) that fixes nano quantum dots, perovskite quantum dots, or fluorescent substances, and then goes through a process of curing with heat or light. The light-emitting body (500) including the resin (510) generates a reaction gas (fume) as the chemical components included in the resin react during the curing process (200 to 250°C) of the resin, and this reaction gas (fume) is discharged through the side vent part (10) located on the side of the molding of the sensor package, so that the light-emitting body (500) is stably fixed inside the sensor package. However, if the reaction gas (fume) that should be discharged through the side vent is not discharged smoothly, there is a problem that the reaction gas (fume) that cannot escape expands in volume and the ultraviolet ray pass filter (400) or the boundary blocking part (600) may be detached from the sensor package (100).

[0147]

[0148] In order to solve this problem, in one embodiment of the present invention, the light emitting body may be a film type. Fig. 16 is a conceptual diagram of a light sensor of the present invention applying a film type light emitting body according to one embodiment of the present invention. Referring to Fig. 16, the present invention is described in detail. After mixing a light emitting body with a resin and manufacturing it in a film type, the film type light emitting body can be installed on the upper part of the light receiving unit (200). As an example of a method for installing the film type light emitting body (500) on the upper part of the light receiving unit, when the light blocking unit is located on the upper part of the ultraviolet ray pass filter (400) as in Fig. 16, the film type light emitting body (500) can be installed on the lower part of the ultraviolet ray pass filter (400), and when the light blocking unit is located on the lower part of the ultraviolet ray pass filter, the film type light emitting body (500) can be installed on the lower part of the light blocking unit, but is not particularly limited thereto.

[0149]

[0150] Furthermore, in addition to the problem of reaction gas (fume) generated during the light-emitting body curing process (approximately 200 to 300°C) during the process of manufacturing the optical sensor of this invention, the air inside the optical sensor may expand as the optical sensor is heated during the attachment process (approximately 300°C) in which the optical sensor of this invention is manufactured and attached to an electronic device by soldering, etc., so there is a need to fundamentally solve this problem.

[0151]

[0152] FIG. 17 is a conceptual diagram of an optical sensor of the present invention that applies a sensor package including a vent hole according to an embodiment of the present invention. Referring to FIG. 17, the present invention will be described in detail. In an embodiment of the present invention, the sensor package (100) may additionally include a vent hole (700) that passes from the inside of the sensor package to the outside of the sensor package. When the sensor of the present invention is manufactured by applying a film-type light-emitting body (500), the reaction gas (fume) generated in the curing process (about 200 to 300°C) is smoothly discharged through the vent hole (700), so that the problem of the ultraviolet ray pass filter (400) or the boundary blocking part (600) being detached from the sensor package (100) can be eliminated. In addition, in the process of attaching the optical sensor of the present invention to an electronic device (reflow process; about 300°C), excess reaction gas is smoothly discharged through the vent hole (700), which can greatly contribute to the stability of the optical sensor. In one embodiment of the present invention, the vent hole (700) may be formed on the bottom surface of the sensor package, and when installed on the bottom surface, the vent hole (700) is naturally closed when the optical sensor of the present invention is mounted on an electronic device, so the problem of noise light entering the inside of the sensor can be completely solved.

[0153]

[0154] A second aspect of the present invention provides an electronic device including the optical sensor of the present invention. The electronic device may be a terminal, a portable terminal, a mobile terminal, a communication terminal, a portable communication terminal, a portable mobile terminal, a display device, etc., and for example, may be a smartphone, a mobile phone, a navigation device, a game console, a TV, a head unit for a vehicle, a notebook computer, a laptop computer, a tablet computer, a PMP (Personal Media Player), a PDA (Personal Digital Assistants), etc., and may be implemented as a pocket-sized portable communication terminal having a wireless communication function, and may be a flexible device or a flexible display device.

[0155] The electronic device of the present invention may communicate with external electronic devices such as servers or perform tasks through linkage with external electronic devices. For example, the electronic device may transmit images captured by a camera and / or location information detected by a sensor unit to a server via a network. The network may be, but is not limited to, a mobile or cellular communication network, a local area network (LAN), a wireless local area network (WLAN), a wide area network (WAN), the Internet, a small area network (SAN), etc.

[0156]

[0157] In the manufacturing example of an electronic device, a person having ordinary knowledge in the technical field to which the present invention pertains can apply the optical sensor of the present invention to an electronic device using a technique for applying a conventional optical sensor to an electronic product, and thus, the repeatability can be easily implemented by a person skilled in the art, and the electronic device according to the disclosure of the present invention may be a combination of one or more of the various devices described above, and it is obvious to a person skilled in the art that the electronic device according to the disclosure is not limited to the devices described above.

[0158]

[0159] While the present invention has been described above with reference to implementation examples or embodiments, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. A sensor package including a light receiving unit and a light emitter inside; A light receiving unit located inside the above sensor package and including a light receiving element; A light blocking part positioned above the light receiving part and at a distance from the light receiving part to block light; An ultraviolet pass filter located at the bottom or top of the above light blocking portion and allowing ultraviolet light to enter the inside of the sensor package; A light emitting body located inside the sensor package and emitting light according to the intensity of incoming ultraviolet rays; and A boundary blocking portion surrounding the contact boundary of the above ultraviolet ray pass filter and the sensor package and blocking noise light: Light sensor.

2. In paragraph 1, The above sensor package has an internal shape of a hexahedron or a cylinder. Light sensor.

3. In paragraph 1, The above light-blocking part has a light transmittance of 20 to 40%. Light sensor.

4. In paragraph 1, The above light blocking part is in the shape of a disc or a square plate. Light sensor.

5. In paragraph 1, The above light blocking portion is formed symmetrically and sequentially in a radial shape while being positioned above or below the above ultraviolet ray passing filter. Light sensor.

6. In paragraph 1, The above light blocking part forms a first light blocking part on the upper part of the light receiving part, forms a first ultraviolet light inlet by being connected to the first light blocking part, and forms a second light blocking part by being connected to the first ultraviolet light inlet. Light sensor.

7. In paragraph 1, The above light-emitting body is at least one selected from the group consisting of nano quantum dots, perovskite quantum dots, and fluorescent substances. Light sensor.

8. In paragraph 1, The above light-emitting body is a filled or film type, Light sensor.

9. In paragraph 1, The above light-emitting body is of film type, The above sensor package further includes a vent hole passing from the inside of the sensor package to the outside of the sensor package. Light sensor.

10. Including a light sensor according to any one of claims 1 to 9, Electronic devices.

Images