CN218675349U - Optical film and wearable device - Google Patents

Abstract

The application provides an optical membrane, which comprises a membrane substrate, wherein the membrane substrate comprises a light divergence area and a light convergence area for light to penetrate through, and a light blocking area positioned between the light divergence area and the light convergence area, and the light blocking area is provided with a light cross-talk prevention groove for weakening interference light; the depth of the light crosstalk prevention groove is h1, the opening width is w1, wherein h1 is larger than w1, the range of h1 is 40-400 mu m, and the range of w1 is 5-50 mu m. This application has increased the reflection and the refraction number of times of disturbing light in the blooming through setting up and preventing the cluster light groove structure to weaken the illumination intensity of disturbing light, effectively blockked the cluster light. In addition, this application still provides the wearing equipment who has above-mentioned optical film.

Description

Optical film and wearable device

Technical Field

The application relates to the technical field of optical detection, in particular to an optical membrane and wearable equipment.

Background

The wearable device can be used for monitoring various biological indexes of a human body, such as sleep monitoring, heart rate monitoring and the like. Wherein, the rhythm of the heart monitoring has become wearing equipment's such as intelligent bracelet, intelligent wrist-watch standard configuration function. One way of heart rate monitoring is by photoelectric transmission measurement. Because human blood has an absorption effect to the light beam of specific wavelength, when heart pump blood every time, the light beam of this specific wavelength all can be absorbed in a large number, consequently when carrying out heart rate monitoring, the optical generator with skin contact in the wearing equipment can send a bundle of light and beat on skin, and optical receiver is through measuring the illumination intensity through being surveyed body reflection/transmission to can acquire the heart rate.

However, because the light receiver can also measure the illumination intensity which is not reflected/transmitted by the measured body, the accuracy rate of the current wearable device for monitoring the heart rate is not high, and the monitoring effect is not good.

Disclosure of Invention

The present application is proposed to solve the above-mentioned technical problems. The embodiment of the application provides an optical film and wearing equipment.

In a first aspect, an embodiment of the present application provides an optical film, which includes a film substrate, where the film substrate includes a light diverging area and a light converging area for light to penetrate through, and a light blocking area located between the light diverging area and the light converging area, where the light blocking area is provided with a crosstalk prevention groove for weakening interference light; the depth of the light crosstalk prevention groove is h1, the opening width is w1, wherein h1 is larger than w1, the range of h1 is 40-400 mu m, and the range of w1 is 5-50 mu m.

With reference to the first aspect, in certain implementation manners of the first aspect, a light shielding material is filled in the light leakage prevention groove to form a light shielding structure, and a height of the light shielding structure is less than or equal to a depth of the light leakage prevention groove.

With reference to the first aspect, in certain implementation manners of the first aspect, the light crossing preventing grooves are annular grooves, the light crossing preventing grooves include the light ray diverging area, the light crossing preventing grooves are arranged at intervals from inside to outside along the center of the membrane substrate, and a distance between every two adjacent light crossing preventing grooves is 5 μm to 5mm.

With reference to the first aspect, in certain implementations of the first aspect, the annular groove of the anti-crosstalk groove is divided into a plurality of line segments; the plurality of line segments are continuously arranged, or the plurality of line segments are discontinuously arranged and are adjacent to the line segments of the anti-crosstalk groove in a staggered mode.

With reference to the first aspect, in certain implementation manners of the first aspect, the light converging region surrounds the light blocking region, at least one auxiliary groove is further disposed on the periphery of the light converging region, the auxiliary groove is an annular groove, and the depth of the annular groove is greater than the opening width of the annular groove.

With reference to the first aspect, in certain implementations of the first aspect, a depth of the crosstalk prevention groove is equal to a thickness of the film substrate, or the depth of the crosstalk prevention groove is less than 3 μm to 10 μm of the thickness of the film substrate.

With reference to the first aspect, in certain implementations of the first aspect, the film substrate includes a base layer and a carrier layer, which are stacked, and the light crosstalk prevention groove penetrates through the carrier layer and extends into the base layer.

With reference to the first aspect, in certain implementations of the first aspect, the bearing layer is formed with a divergent microstructure in the light divergent area, and/or the bearing layer is formed with a light-gathering microstructure or a light-gathering groove in the light converging area.

With reference to the first aspect, in certain implementation manners of the first aspect, a black ink layer is silk-screened at a position corresponding to the light blocking area on one side of the bearing layer away from the base layer and/or on one side of the base layer away from the bearing layer to form a reinforcing structure.

In a second aspect, an embodiment of the present application provides a wearable device, which includes a light generator and a light receiver, and an optical film as described above, wherein the light generator emits light through the light diverging area, and the light receiver receives light through the light converging area.

The embodiment of the application provides an optical film, through setting up the structure of preventing the crosstalk groove, the reflection and the refraction number of times of disturbing light in optical film have been increased, thereby the illumination intensity of disturbing light has been weakened, effectively blockked the disturbing light that is received by optical receiver, the part has blockked the disturbing light at wearing equipment apron (back cover glass) -air interface and/or diaphragm base plate-air interface reflection simultaneously, thereby the light ratio of the reflection of the quilt survey body that optical receiver received has been improved, and then the rate of accuracy of heart rate monitoring data has been improved.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.

Fig. 1 is a front view of a wearable device according to an exemplary embodiment of the present application.

Fig. 2 is a schematic top view of an optical film provided in an exemplary embodiment of the present application.

Fig. 3 isbase:Sub>A schematic cross-sectional view of the optical film shown in fig. 2 in the directionbase:Sub>A-base:Sub>A.

Fig. 4 is a schematic cross-sectional view of an anti-glare groove of an optical film according to the present disclosure.

Fig. 5 is a schematic top view of the anti-crosstalk groove of the optical film of the present application.

Fig. 6 is a schematic top view of an optical film provided in another exemplary embodiment of the present application.

Fig. 7 isbase:Sub>A schematic cross-sectional view of the optical film shown in fig. 6 in the directionbase:Sub>A-base:Sub>A.

Fig. 8 is a schematic cross-sectional view of an optical film provided by another exemplary embodiment of the present application.

Fig. 9 isbase:Sub>A schematic cross-sectional view of the optical film shown in fig. 8 in the directionbase:Sub>A-base:Sub>A.

Fig. 10 is a schematic top view of an optical film provided in another exemplary embodiment of the present application.

Fig. 11 isbase:Sub>A schematic cross-sectional view of the optical film shown in fig. 10 in the directionbase:Sub>A-base:Sub>A.

Fig. 12 is a schematic cross-sectional view of an optical film provided in another exemplary embodiment of the present application.

Fig. 13 is a schematic cross-sectional view of a light-collecting groove of the optical film of the present application.

Fig. 14 is a schematic top view of an optical film provided in another exemplary embodiment of the present application.

Fig. 15 isbase:Sub>A schematic cross-sectional view of the optical film sheet shown in fig. 14 in thebase:Sub>A-base:Sub>A direction.

Fig. 16 is a schematic top view of an optical film provided in accordance with another exemplary embodiment of the present application.

Fig. 17 isbase:Sub>A schematic sectional view in the directionbase:Sub>A-base:Sub>A of the optical film shown in fig. 16.

Fig. 18 is a schematic cross-sectional view of an optical film provided by another exemplary embodiment of the present application.

Fig. 19 is a schematic block diagram of a wearable device according to an exemplary embodiment of the present application.

Detailed Description

At present, photoplethysmography (PPG), which is referred to as a photoplethysmography, is mainly adopted in the aspect of heart rate monitoring by wearable equipment. The method for monitoring the heart rate is based on the principle that substances absorb Light, namely, a Light-Emitting Diode (LED) and a Photodiode (PD) of the wearable device are used for irradiating blood vessels for a period of time, and the heart rate is measured according to the absorbance of blood. Specifically, when the LED emits a light beam of a certain wavelength to the skin surface, the light beam will be transmitted to the PD by transmission or reflection, during which the PD monitors the decrease of the light intensity due to the attenuation by absorption by the skin muscles and blood. The reflection of skin, bone, meat, fat, etc. of human body to light is a fixed value, and the capillary vessels and artery and vein continuously increase and decrease with the pulse volume under the action of heart. When the heart contracts, the peripheral blood volume is the largest, the light absorption amount is also the largest, and the light intensity detected by PD is the smallest; on the contrary, when the heart is in diastole, the light intensity detected by the PD is the largest, so that the light intensity received by the PD is in a pulsatile change.

At present, the reflection-type photoelectric method is the most commonly used method for monitoring the heart rate, and a light emitting diode and a photodiode of the reflection-type photoelectric method are positioned on the same side of a detected part and mainly measure reflected light. The method has the advantages of simple and convenient measurement of the heart rate, low requirements on measurement parts, and capability of almost measuring places with smooth tissues and little subcutaneous fat, such as the forehead and the wrist. Therefore, most wearing devices such as smart bracelets and smart watches adopt the method to measure the heart rate.

The existing wearable device with heart rate monitoring function is provided with a corresponding LED lens and a corresponding PD lens on one side of a light emitting diode and a photodiode opposite to a detected part. However, the use of the LED lens causes a small portion of light emitted by the light emitting diode to be reflected inside the LED lens, and the light is not received by the photodiode without being detected, so that the accuracy of monitoring data is low, and the monitoring effect is not good.

In view of this, the embodiment of the application provides an optical film and wearing equipment, and solves the problem that the heart rate monitoring accuracy is not high due to the fact that an optical receiver measures the intensity of illumination which is not reflected/transmitted by a measured body. The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

Fig. 1 is a front view of a wearable device according to an exemplary embodiment of the present application. As shown in fig. 1, a wearable device 100 provided in an embodiment of the present application includes: a light generator 110, a light receiver 120, and an optical film 130. The light generator 110 has a cylindrical shape, the light receiver 120 has a circular cylindrical shape, and the optical film 130 has a circular sheet shape. The area corresponding to the light generator 110 is a light emitting area S110, and the area corresponding to the light receiver 120 is a light receiving area S120. The optical film 130 includes a film substrate 131, wherein the film substrate 131 includes a light diverging region P110 corresponding to the light emitting region S110, a light converging region P120 corresponding to the light receiving region S120, and a light blocking region P130 located between the light emitting region S110 and the light receiving region S120, the light blocking region P130 being shown by the oblique line portion in fig. 1.

The specific structure of the optical film 130 provided in the present application is specifically discussed below.

Fig. 2 is a schematic top view of an optical film provided in an exemplary embodiment of the present application. As shown in fig. 2, an optical film 130 provided in the embodiment of the present application includes: a diaphragm substrate 131. The film substrate 131 includes a light diverging region P110, a light converging region P120, and a light blocking region P130. The light diverging region P110 and the light converging region P120 are for light to penetrate, and the light blocking region P130 is located between the light diverging region P110 and the light converging region P120. Specifically, the film substrate 131 is provided with a crosstalk prevention groove 132 for attenuating interference light at the light blocking region P130.

In an embodiment of the present application, the film substrate 131 is a circular disk, the light blocking region P130 is disposed to annularly surround the light diverging region P110, and the light converging region P120 is disposed to annularly surround the light blocking region P130. Illustratively, the light diverging region P110, the light blocking region P130 and the light converging region P120 are sequentially disposed from inside to outside with the center of the film substrate 131 as a center.

It is emphasized that the light blocking region P130 is used to reduce the illumination intensity of the interference light rays, which include the light rays emitted by the light generator and directly received by the light receiver without being reflected by the measured object. The effective light includes light emitted by the light generator and reflected by the measured object to be received by the light receiver.

Fig. 3 isbase:Sub>A schematic cross-sectional view of the optical film 130 shown in fig. 2 in the direction ofbase:Sub>A-base:Sub>A. As shown in fig. 2 and 3, the central axis of the diaphragm substrate 131 isbase:Sub>A center line of symmetry onbase:Sub>A diameter thereof, andbase:Sub>A cross-sectional view alongbase:Sub>A half of the axis of the array of the optical diaphragm 130 shown in fig. 2 is shown in fig. 3, as it is understood from the perspective and clear thatbase:Sub>A cross-sectional view along thebase:Sub>A-base:Sub>A direction of the optical diaphragm 130 is provided withbase:Sub>A cross-sectional line atbase:Sub>A radius. In an embodiment of the present application, the depth h1 of the light leakage preventing groove 132 is greater than the opening width w1 of the light leakage preventing groove 132 on the surface of the film substrate 131, i.e., h1 > w1. The opening width w1 of the light leakage preventing groove 132 on the surface of the film substrate 131 is the radial dimension of the light leakage preventing groove 132 on the opening surface of the film substrate 131.

In an embodiment of the present application, the light leakage preventing groove 132 includes annular grooves, and at least one of the annular grooves is disposed to annularly surround the light diverging region P110. Illustratively, a plurality of light-crosstalk-preventing grooves 132 are spaced from the inside to the outside along the center of the film substrate 131.

The optical film provided by the embodiment of the application comprises a film substrate, wherein the film substrate comprises a light blocking area with a light-crosstalk prevention groove. Through setting up and preventing the cluster light groove structure, the double-phase opposite side wall of preventing the cluster light groove has increased the reflection and the refraction number of times of disturbing light in optical film, thereby weakened the illumination intensity of disturbing light, effectively blocked the disturbing light who is received by optical receiver, the part has blockked at wearing equipment apron (back cover glass) -air interface and/or diaphragm base plate-air interface reflected disturbing light simultaneously, thereby improved the light ratio of the measured body reflection of optical receiver receipt, and then improved the rate of accuracy of heart rate monitoring data.

Illustratively, the depth h1 of the anti-crosstalk groove 132 may be 40 μm to 400 μm, such as 100 μm; the opening width w1 may be 5 μm to 50 μm, such as 20 μm. The depth h1 of the light-crosstalk prevention groove 132 may be equal to the thickness of the diaphragm substrate 131, or may be smaller than the thickness of the diaphragm substrate 131, for example, the depth h1 of the light-crosstalk prevention groove 132 is smaller than the thickness of the diaphragm substrate 131 by 3 μm to 10 μm, preferably 5 μm. The ratio of the depth h1 of the anti-crosstalk groove 132 to the opening width w1 of the anti-crosstalk groove 132 may be 3 to 10, such as 5.

In an embodiment of the present invention, the material of the film substrate 131 may be glass, PET, PC, PCI, PMMA, etc., and the thickness of the film substrate 131 is preferably 100 μm to 200 μm. The light-crosstalk prevention groove 132 is formed by a process such as photolithography and etching.

The shape and position of the light-crosstalk preventing groove 132 will be described in detail below with reference to fig. 4 and 5.

Fig. 4 is a schematic cross-sectional view illustrating an anti-crosstalk groove according to an exemplary embodiment of the present application. As shown in fig. 4,base:Sub>A cross-sectional shape of the light-crosstalk prevention groove 132 along thebase:Sub>A-base:Sub>A direction of the optical film shown in fig. 3 includes any one ofbase:Sub>A rectangle,base:Sub>A trapezoid,base:Sub>A triangle,base:Sub>A pointed cone, or an irregular shape, and the cross-sectional shape of the light-crosstalk prevention groove 132 may be set according to actual needs, which is not further limited in this embodiment of the present application.

Fig. 5 is a schematic top view of the light leakage preventing grooves, which shows the distribution shape and arrangement of the light leakage preventing grooves. As shown in fig. 5, the annular groove of the light crosstalk preventing groove 132 is divided into a plurality of line segments; the multiple line segments are continuously arranged, or the multiple line segments are discontinuously arranged, and the line segments of the adjacent anti-crosstalk grooves are arranged in a staggered mode. Specifically, the top view shape of the anti-glare groove 132 includes a plurality of concentric circles, or the area between any two adjacent concentric circles of the plurality of concentric circles is divided into a plurality of arc-shaped areas, or each circle of the plurality of concentric circles is divided into a plurality of arcs, wherein the plurality of arcs form an intermittent circle, and the arcs between the adjacent concentric circles are arranged in a staggered manner. The overlooking shape of the light crosstalk prevention groove 132 further includes a plurality of closed irregular curves sequentially arranged from inside to outside along the center of the film substrate 131, or each irregular curve of the plurality of irregular curves is divided into a plurality of irregular sub-curves, wherein the plurality of irregular sub-curves form an intermittent irregular curve, and the sub-curves of adjacent irregular curves are arranged in a staggered manner; the top view shape of the light leakage preventing groove 132 further includes an ellipse or a rectangle, which is not further limited by the embodiment of the present application.

Illustratively, the spacing between adjacent light-crosstalk-preventing grooves 132 may be 5 μm to 5mm, preferably 10 μm to 25 μm, which is not further limited by the embodiments of the present application.

Fig. 6 is a schematic top view of an optical film provided in another exemplary embodiment of the present application. Fig. 7 isbase:Sub>A schematic cross-sectional view of the optical film shown in fig. 6 in the directionbase:Sub>A-base:Sub>A. The embodiment shown in fig. 6 and 7 of the present application is extended on the basis of the embodiment shown in fig. 2 and 3 of the present application, and the differences between the embodiment shown in fig. 6 and 7 and the embodiment shown in fig. 2 and 3 are emphasized below, and the descriptions of the same parts are omitted.

As shown in fig. 6 and 7, a light shielding structure 133 is disposed in the light-crosstalk preventing groove 132, and the light shielding structure 133 is represented by a black annular filling pattern in fig. 6. The light shielding structure 133 is formed by filling the light shielding material with dark color in the light shielding groove 132, for example, the light shielding structure 133 may be a light shielding ink with gray or black color for blocking and absorbing light emitted from the light generator 110 and reflected in the film substrate 131. The light-shielding ink may fill the light-crosstalk prevention groove 132, or may partially fill the light-crosstalk prevention groove 132, that is, the height of the light-shielding structure 133 is less than or equal to the depth of the light-crosstalk prevention groove 132. The light leakage preventing groove 132 is preferably filled to maximally block light generated from the light generator 110 reflected within the film substrate 131.

The embodiment of the application provides an optical diaphragm, through preventing set up the shading structure in the cluster light groove, effectively block, absorbed the light that light generator sent, at the diaphragm base plate internal reflection to avoided the light that light generator sent directly by the phenomenon of light receiver receipt, weakened the illumination intensity of interference light, prevented that interference light from flooding effective light, thereby improved heart rate monitoring data's rate of accuracy.

Fig. 8 is a schematic top view of an optical film provided in another exemplary embodiment of the present application. Fig. 9 isbase:Sub>A schematic cross-sectional view of the optical film sheet shown in fig. 8 in the directionbase:Sub>A-base:Sub>A. The embodiment shown in fig. 8 and 9 of the present application is extended on the basis of the embodiment shown in fig. 6 and 7 of the present application, and the differences between the embodiment shown in fig. 8 and 9 and the embodiment shown in fig. 6 and 7 are emphasized below, and the descriptions of the same parts are omitted.

As shown in fig. 8 and 9, the light converging region P120 surrounds the light blocking region P130. At least one auxiliary groove 134 is further disposed within a predetermined range of the periphery of the light converging region P120. In an embodiment of the present application, the auxiliary grooves 134 may be annular grooves, and at least one auxiliary groove 134 is disposed to annularly surround the light converging region P120. The auxiliary groove 134 at the periphery of the light converging region P120 may correspond to the light leakage preventing groove 132 of the light blocking region P130. The distribution and shape of the auxiliary grooves 134 may be referred to as the light-crosstalk prevention grooves 132, and may be formed in the same process as the light-crosstalk prevention grooves 132 when it is desired to be disposed.

Specifically, the auxiliary grooves 134 serve to attenuate the illumination intensity of the disturbing light. In addition, the preset range can be set according to actual needs, and the embodiment of the present application does not further limit the preset range.

Further, the auxiliary groove 134 may also be filled with a light-shielding ink, such as black light-shielding ink, to form a second light-shielding structure 1341, so as to absorb and attenuate the interference light.

The optical diaphragm provided by the embodiment of the application sets up at least one auxiliary tank through the peripheral within range of predetermineeing in light convergence district, has shielded the angle that reflects to the optic fibre convergence district and has more inclined to one side light, has weakened the illumination intensity of interference light to the light ratio of the reflection of the measured body of the process that optical receiver received has been improved, and then has improved the rate of accuracy of heart rate monitoring data.

Fig. 10 is a schematic top view of an optical film provided in another exemplary embodiment of the present application. Fig. 11 isbase:Sub>A schematic cross-sectional view of the optical film shown in fig. 10 in the directionbase:Sub>A-base:Sub>A. The embodiment shown in fig. 10 and 11 of the present application is extended on the basis of the embodiment shown in fig. 8 and 9 of the present application, and the differences between the embodiment shown in fig. 10 and 11 and the embodiment shown in fig. 8 and 9 are emphasized below, and the descriptions of the same parts are omitted.

As shown in fig. 10 and 11, the film substrate 131 further includes a light converging portion P120 having a light converging microstructure 135, wherein the light converging portion P120 corresponds to the light receiving area S120.

In an embodiment of the present application, the film substrate 131 is a laminated structure including a base layer 1311, a carrier layer 1312, and a bonding layer 1313. The carrier layer 1312 and the adhesive layer 1313 are disposed on both sides of the base layer 1311, respectively. The base layer 1311 is made of one or a combination of PET, PC, PMMA, and PC composite. The carrier layer 1312 forms a light condensing microstructure 135 at the light converging region P120. The carrier layer 1312 is preferably made of UV glue, the light-gathering microstructures 135 are formed by coating UV glue on the base layer 1311, embossing and curing the UV glue, and then the light-string prevention grooves 132 and the auxiliary grooves 134 are formed at predetermined positions, and the light-string prevention grooves 132 and the auxiliary grooves 134 penetrate through the carrier layer 1312 and extend into the base layer 1311 respectively. In other embodiments, the thickness of the base layer 1311 is smaller, so that the light-leakage-preventing grooves 132 and the auxiliary grooves 134 may be formed by stamping together with the light-condensing microstructures 135, or the base layer 1311 may be peeled off after forming together. The adhesive layer 1313 is preferably OCA glue for adhering the optical film 130 to the wearing device, such as to the inner surface of the wearing device cover. The optical film can be provided with a bonding layer, and the optical film can also be directly formed on the inner surface of the cover plate of the wearable device, or arranged on the wearable device in a back gluing mode or other pressing modes.

In an embodiment of the present application, the light condensing microstructure 135 may be configured as a fresnel lens, and a plurality of fresnel lenses are distributed in the light converging portion P120 along a circular ring. The light condensing microstructures 135 are used to condense the light to increase the light receiving rate of the light receiver 120. Specifically, the fresnel lens allows more light to be received by the light receiver 120.

In an embodiment of the present invention, the shape of the light-condensing microstructure 135 may be a tooth shape, a spherical shape, an aspherical shape, or a conical shape, which is not further limited in the embodiment of the present invention as long as the light can be condensed. In other embodiments, the light-gathering microstructure 135 may also be other types of microstructures for gathering light, such as prisms, microlenses, etc. In addition, the distance between two adjacent light condensing microstructures 135 may be 10 μm to 200 μm, preferably 10 μm to 80 μm. For example, if the shape of the light condensing microstructures 135 is a tooth, the distance between two adjacent light condensing microstructures 135 is the distance between two adjacent teeth; if the light concentrating microstructures 135 are pyramids, the distance between two adjacent light concentrating microstructures 135 is the center-to-center distance between two adjacent pyramids. The light condensing microstructures 135 are convex or concave, and the height or depth of the light condensing microstructures may be 1 μm to 50 μm, preferably 1 μm to 20 μm.

The optical film provided by the embodiment of the application comprises a light converging area with a light converging microstructure, and light reflected by a detected body is converged through the light converging microstructure, so that the light receiver receives more effective light, and the accuracy of heart rate monitoring data is improved.

Fig. 12 is a schematic cross-sectional view of an optical film provided in another exemplary embodiment of the present application. The embodiment shown in fig. 12 of the present application is extended based on the embodiment shown in fig. 11 of the present application, and the differences between the embodiment shown in fig. 12 and the embodiment shown in fig. 11 are emphasized below, and the descriptions of the same parts are omitted.

As shown in fig. 12, the light-gathering groove 136 is formed between the carrier layer 1312 and the light converging region. The film substrate 131 further includes a light converging region P120 having a plurality of light converging grooves 136, wherein the light converging region P120 corresponds to the light receiving region S120, a depth h2 of the light converging grooves 136 is greater than an opening width w2 of the light converging grooves 136 on the surface of the film substrate 131, and the opening width w2 of the light converging grooves 136 on the surface of the film substrate 131 is a radial dimension of the light converging grooves 134 on the opening surface of the film substrate 131. Illustratively, the ratio of the depth h2 of the light collection groove 136 to the opening width w2 of the light collection groove 134 may be any value of 1 to 10, preferably 4.

In an embodiment of the present application, fig. 13 is a schematic cross-sectional view of a light-gathering groove of an optical film. Illustratively, the cross-sectional shape of the light-gathering groove 136 may be any one of a rectangle, a trapezoid, a triangle, a pointed cone, or an irregular shape, and the cross-sectional shape of the light-gathering groove 136 may be set according to actual needs, which is not further limited in this embodiment of the application.

In addition, the planar shape of the light-gathering grooves 136 may be a circle, an ellipse or a rectangle, and the spacing between adjacent light-gathering grooves 136 may be 5 μm to 100 μm, preferably 10 μm to 25 μm, for continuous arrangement and/or intermittent arrangement, which is not further limited in the embodiments of the present application.

In an embodiment of the present invention, the light-gathering grooves 136 are formed on the carrier layer 1312 by UV printing, and the light-blocking material may be filled in the light-gathering grooves 136 to form the third light-blocking structures 1361, preferably dark light-blocking ink, such as gray or black light-blocking ink, which can absorb the interference light. The light-collecting groove 136 may be formed on the film substrate 131 together with the light-crosstalk prevention groove 132 and the auxiliary groove 134, or may be formed on the carrier layer 1312 by stamping.

The optical film provided by the embodiment of the application comprises a light convergence area with at least one light gathering groove, and through the arrangement of the light gathering groove structure, the light reflected to the optical fiber convergence area in a more inclined angle is shielded, and meanwhile, the interference light reflected by a wearable device cover plate (rear cover glass) -air interface and/or a film substrate-air interface is blocked, so that the light ratio received by a light receiver and reflected by a detected body is improved, and the accuracy of heart rate monitoring data is further improved.

Fig. 14 is a schematic top view of an optical film provided in another exemplary embodiment of the present application. Fig. 15 isbase:Sub>A schematic cross-sectional view of the optical film shown in fig. 14 in the directionbase:Sub>A-base:Sub>A. The embodiment shown in fig. 14 and 15 of the present application is extended on the basis of the embodiment shown in fig. 10 and 11 of the present application, and the differences between the embodiment shown in fig. 14 and 15 and the embodiment shown in fig. 10 and 11 are emphasized below, and the descriptions of the same parts are omitted.

As shown in fig. 14 and 15, the film substrate 131 further includes a light diverging region P110 having a diverging microstructure 137, wherein the light diverging region P110 corresponds to the light emitting region S110.

In an embodiment of the present application, the diverging microstructure 137 may be configured as a fresnel lens. The dispersing microstructure 137 is used to deflect the angle of light emitted by the light generator 110 to increase the illuminated area and the absorbed light energy of the subject. Specifically, the fresnel lens is used to diverge the central light emitted from the light generator 110 to increase the illuminated area of the object, and is also used to converge the more angled light emitted from the light generator 110 to increase the light energy absorbed by the object.

In an embodiment of the present invention, the shape of the divergent microstructure 137 may be a tooth, a sphere, an aspheric shape, or a cone, which is not further limited in the embodiment of the present invention as long as the light can be deflected. In other embodiments, the divergent microstructure 137 may also be a prism, a micro-lens, or other microstructures that can help the light to diverge. In addition, the distance between two adjacent divergent microstructures 137 may be 10 μm to 200 μm, preferably 10 μm to 80 μm. For example, if the shape of the divergent microstructures 137 is a tooth, the distance between two adjacent divergent microstructures 137 is the distance between two adjacent teeth; if the diverging microstructures 137 are pyramids, the distance between two adjacent diverging microstructures 137 is the center-to-center distance between two adjacent pyramids. In addition, the depth of the divergent microstructure 137 may be 1 μm to 50 μm, preferably 1 μm to 20 μm.

As shown in fig. 15, the carrier layer 1312 forms a divergent microstructure 137 at the light divergent region P110. The divergent microstructure 137 and the light-gathering microstructure 135 can be formed by imprinting and curing with UV glue, and have good structural stability and manufacturability. In other embodiments, the divergent microstructures 137 and the light-gathering grooves 136 are formed by imprinting and curing a UV paste together.

The optical film piece that this application embodiment provided is including having the light divergence district that diverges the micro-structure, through diverging the central light that micro-structure divergence light generator transmitted, increased the area that the measured body was illuminated to, it has still drawn in the more inclined to one side light of angle that light generator transmitted to diverge the micro-structure, increased the absorptive light energy of measured body, thereby under the same condition, can reduce the illuminating power of light generator, reduced the consumption of light generator, improved wearing equipment's continuation of the journey and experienced. In addition, the optical film piece that this application provided has integrateed light emission area, light and has blockked district and light receiving area, has improved heart rate monitoring data's rate of accuracy. Moreover, the optical diaphragm provided by the application is simple in structure, only needs to be attached to the cover plate of the wearable device, and the step of respectively configuring the lenses in the light emitting area and the light receiving area is omitted. The application provides an optics diaphragm thickness can set for according to actual need, and preferred 0.2mm is below, helps improving wearing equipment's frivolous experience.

Fig. 16 is a schematic top view of an optical film provided in accordance with another exemplary embodiment of the present application. Fig. 17 isbase:Sub>A schematic sectional view in the directionbase:Sub>A-base:Sub>A of the optical film shown in fig. 16. The embodiment shown in fig. 16 and 17 of the present application is extended on the basis of the embodiment shown in fig. 14 and 15 of the present application, and the differences between the embodiment shown in fig. 16 and 17 and the embodiment shown in fig. 14 and 15 are emphasized below, and the descriptions of the same parts are omitted.

As shown in fig. 16 and 17, a reinforcing layer 138 (indicated by a hatched grid line in fig. 16) is provided on the upper side of the light blocking region P130 and the auxiliary groove 134. Preferably, the reinforcing layer 138 is provided with dark ink, such as black ink applied to the upper sides of the light blocking regions P130 and the auxiliary grooves 134 through a screen printing process. The reinforcing layer 138 may cover the light blocking region P130 entirely or partially, or may cover the region where the auxiliary groove 134 is located entirely or partially. The effect of blocking the light that the light generator sent, at the diaphragm base plate internal reflection has further been strengthened in the setting of enhancement layer 138 to avoided the light that the light generator sent directly by the phenomenon of light receiver receipt, weakened the illumination intensity of interference light, prevented to disturb effective light that the light floods, thereby further improved the rate of accuracy of heart rate monitoring data.

In an embodiment of the present application, referring to fig. 18, a reinforcing layer 138 is disposed under the light blocking region P130 and the auxiliary groove 134 to also enhance the blocking effect. In other embodiments, reinforcing layers 138 are provided on both the upper and lower sides of the light blocking region P130 and the auxiliary groove 134 to provide the same reinforcing effect.

And the black ink layer is silk-printed at the corresponding part of the light ray blocking area to form a reinforcing structure at one side of the bearing layer far away from the base layer and/or one side of the base layer far away from the bearing layer, so that the light ray blocking area can be reinforced to reduce interference light rays.

For example, the ink layer 138 may be disposed only on the upper side and/or the lower side of the light blocking region P130, or the ink layer 138 may be disposed only on the upper side and/or the lower side of the auxiliary groove 134, which is not further limited in this embodiment.

Next, a wearable device according to an embodiment of the present application is described with reference to fig. 19. Fig. 19 is a schematic structural diagram of a wearable device according to an exemplary embodiment of the present application.

As shown in fig. 19, the wearable device 100 includes a light generator 110 and a light receiver 120, and an optical patch 130 as provided in any of the embodiments described above.

Of course, for simplicity, only some of the components of the wearable device 100 relevant to the present application are shown in fig. 19. In addition, the wearable device 100 may include any other suitable components, depending on the particular application.

It should be noted that the size and the proportional relationship of each line and each graph in fig. 1 to 19 are set for convenience of description, and do not represent the actual size and the proportional relationship.

The basic principles of the present application have been described above with reference to specific embodiments, but it should be noted that advantages, effects, etc. mentioned in the present application are only examples and are not limiting, and the advantages, effects, etc. must not be considered to be possessed by various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.

The block diagrams of devices, apparatuses, systems referred to in this application are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".

It should also be noted that in the devices, apparatuses, and methods of the present application, the components or steps may be decomposed and/or recombined. These decompositions and/or recombinations are to be considered as equivalents of the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.

Claims (10)

1. An optical film is characterized by comprising a film substrate, wherein the film substrate comprises a light divergence region and a light convergence region for light to penetrate through, and a light blocking region positioned between the light divergence region and the light convergence region, and the light blocking region is provided with a light crosstalk prevention groove for weakening interference light; the depth of the light crosstalk prevention groove is h1, the opening width is w1, wherein h1 is larger than w1, the range of h1 is 40-400 mu m, and the range of w1 is 5-50 mu m.

2. The optical film according to claim 1, wherein the light-shielding material is filled in the light-leakage-preventing groove to form a light-shielding structure, and the height of the light-shielding structure is less than or equal to the depth of the light-leakage-preventing groove.

3. The optical film according to claim 1, wherein the light leakage preventing grooves are annular grooves, a plurality of the light leakage preventing grooves surround the light diverging region, the light leakage preventing grooves are spaced from inside to outside along the center of the film substrate, and a distance between adjacent light leakage preventing grooves is in a range of 5 μm to 5mm.

4. The optical film according to claim 3, wherein the annular groove of the anti-glare groove is divided into a plurality of line segments; the plurality of line segments are continuously arranged, or the plurality of line segments are discontinuously arranged and are adjacent to the line segments of the anti-crosstalk groove in a staggered mode.

5. The optical film according to claim 3, wherein the light converging region surrounds the light blocking region, and at least one auxiliary groove is disposed on the periphery of the light converging region, the auxiliary groove is an annular groove, and the depth of the annular groove is greater than the opening width of the annular groove.

6. The optical film according to claim 1, wherein the depth of the light crosstalk prevention groove is equal to the thickness of the film substrate, or the depth of the light crosstalk prevention groove is less than 3 μm to 10 μm of the thickness of the film substrate.

7. The optical film according to any one of claims 1 to 5, wherein the film substrate comprises a base layer and a carrier layer which are stacked, and the light-crosstalk prevention groove penetrates through the carrier layer and extends into the base layer.

8. The optical film as claimed in claim 7, wherein the supporting layer is formed with a divergent microstructure on the light divergent region and/or a light converging microstructure or a light converging groove on the light converging region.

9. The optical film as claimed in claim 7, wherein a black ink layer is printed on a side of the carrier layer away from the base layer and/or a side of the base layer away from the carrier layer to form a reinforcing structure.

10. A wearable device comprising a light generator and a light receiver, and the optical film as recited in any of claims 1-9, wherein the light generator emits light through the light diverging region and the light receiver receives light through the light converging region.

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