CN117452531A - Optical film and wearing equipment - Google Patents

Abstract

The application provides an optical film, is applied to the wearing equipment including light generator and optical receiver, and this optical film includes: a membrane substrate; the diaphragm substrate comprises a light blocking area with at least one first groove, the light blocking area is located between a light emitting area corresponding to the light generator and a light receiving area corresponding to the light receiver, the light blocking area is used for weakening illumination intensity of interference light, the interference light comprises light emitted by the light generator and is not reflected by a tested body, and the interference light is directly received by the light receiver. This application has increased the reflection and the refraction number of times of disturbing light in the optics diaphragm through setting up first groove structure to weaken the illumination intensity of disturbing light, effectively blockked the disturbing light who is received by the optical receiver, thereby improved the light ratio of being surveyed the body reflection that the optical receiver received, and then improved heart rate monitoring data's rate of accuracy.

Description

Optical film and wearing equipment

Technical Field

The application relates to the technical field of optical detection, in particular to an optical membrane and wearing 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. The heart rate monitoring has become a standard function of wearable devices such as intelligent bracelets and intelligent watches. One way of heart rate monitoring is photoelectric transmission measurement. Because the human blood has the absorption effect on the light beam with the specific wavelength, the light beam with the specific wavelength can be absorbed in a large quantity when the heart pumps blood each time, when heart rate monitoring is carried out, the light generator in the wearing equipment, which is contacted with the skin, can emit a beam of light to strike the skin, and the light receiver can acquire the heart rate by measuring the illumination intensity reflected/transmitted by the tested body.

However, since the light receiver also measures the intensity of illumination that is not reflected/transmitted by the measured object, the accuracy of monitoring the heart rate by the present wearable device is not high, and the monitoring effect is not good.

Disclosure of Invention

The present application has been made in order to solve the above technical problems. The embodiment of the application provides an optical film and a wearable device.

In a first aspect, an embodiment of the present application provides an optical film for use in a wearable device including a light generator and a light receiver, the optical film comprising: a membrane substrate; the diaphragm substrate comprises a light blocking area with at least one first groove, the light blocking area is located between a light emitting area corresponding to the light generator and a light receiving area corresponding to the light receiver, the light blocking area is used for weakening illumination intensity of interference light, the interference light comprises light emitted by the light generator and is not reflected by a tested body, and the interference light is directly received by the light receiver.

With reference to the first aspect, in certain implementation manners of the first aspect, the diaphragm substrate further includes a light converging region having a first microstructure, where the light converging region corresponds to the light receiving region, and the first microstructure is configured to converge light to increase a light receiving rate of the light receiver.

With reference to the first aspect, in certain implementations of the first aspect, the film substrate further includes a light converging region having at least one second groove, where the light converging region corresponds to the light receiving region, and a depth of the second groove is greater than an opening width of the second groove at a surface of the film substrate.

With reference to the first aspect, in some implementations of the first aspect, at least one third groove is further disposed within a preset range of a periphery of the light converging region, where the third groove is used to weaken illumination intensity of the interfering light.

With reference to the first aspect, in certain implementations of the first aspect, the diaphragm substrate further includes a light-emitting region having a second microstructure, where the light-emitting region corresponds to the light-emitting region, and the second microstructure is configured to deflect an angle of light emitted by the light generator to increase an illuminated area of the object and absorbed light energy.

With reference to the first aspect, in certain implementations of the first aspect, the light blocking region is configured to annularly surround the light diverging region, and the light converging region is configured to annularly surround the light blocking region.

With reference to the first aspect, in certain implementation manners of the first aspect, a light shielding structure is disposed in the first groove, and the light shielding structure is used for blocking light rays emitted by the light generator and reflected in the diaphragm substrate.

With reference to the first aspect, in certain implementations of the first aspect, a depth of the first groove is greater than an opening width of the first groove at a surface of the diaphragm substrate.

With reference to the first aspect, in certain implementations of the first aspect, the first groove includes an annular groove, at least one of which is disposed annularly surrounding the light-diverging region.

In a second aspect, an embodiment of the present application provides a wearable device comprising a light generator and a light receiver, and an optical film as provided in any of the embodiments above.

An optical film provided in an embodiment of the present application is applied to a wearable device including a light generator and a light receiver, and includes: a membrane substrate; the diaphragm substrate comprises a light blocking area with at least one first groove, the light blocking area is located between a light emitting area corresponding to the light generator and a light receiving area corresponding to the light receiver, the light blocking area is used for weakening illumination intensity of interference light, the interference light comprises light emitted by the light generator and is not reflected by a tested body, and the interference light is directly received by the light receiver. According to the method, the first groove structure is arranged, the reflection and refraction times of the interference light in the optical membrane are increased, so that the illumination intensity of the interference light is weakened, the interference light received by the light receiver is effectively blocked, meanwhile, the interference light reflected by the rear cover glass-air interface and/or the membrane substrate-air interface of the wearing equipment is partially blocked, the light occupation ratio of the light received by the light receiver and reflected by the measured body is improved, and the accuracy of heart rate monitoring data is further improved.

Drawings

The foregoing and other objects, features and advantages of the present application will become more apparent from the following more particular description of embodiments of the present application, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.

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

Fig. 2a is a schematic top view of an optical film according to an exemplary embodiment of the present disclosure.

FIG. 2b is a schematic cross-sectional view of the optical film of FIG. 2a in the N-N direction.

Fig. 3a is a schematic cross-sectional view of a first groove according to an exemplary embodiment of the present application.

Fig. 3b is a schematic top view of the first groove shown in fig. 3 a.

Fig. 4a is a schematic top view of an optical film according to another exemplary embodiment of the present application.

FIG. 4b is a schematic cross-sectional view of the optical film of FIG. 4a in the N-N direction.

Fig. 5 is a schematic cross-sectional view of an optical film according to another exemplary embodiment of the present application.

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

FIG. 6b is a schematic cross-sectional view of the optical film of FIG. 6a in the N-N direction.

Fig. 7a is a schematic top view of an optical film according to another exemplary embodiment of the present disclosure.

FIG. 7b is a schematic cross-sectional view of the optical film of FIG. 7a in the N-N direction.

Fig. 8a is a schematic top view of an optical film according to another exemplary embodiment of the present disclosure.

FIG. 8b is a schematic cross-sectional view of the optical film of FIG. 8a in the N-N direction.

Fig. 9a is a schematic top view of an optical film according to another exemplary embodiment of the present disclosure.

FIG. 9b is a schematic cross-sectional view of the optical film of FIG. 9a in the N-N direction.

FIG. 9c is a schematic cross-sectional view of another optical film shown in FIG. 9a in the N-N direction.

Fig. 10 is a schematic structural diagram of a wearable device according to an exemplary embodiment of the present application.

Reference numerals:

a wearable device 100; a light generator 110; an optical receiver 120; an optical film 130; a diaphragm substrate 131; the microstructure formation layer 1311; a substrate layer 1312; a tie layer 1313; a first groove 132; a first microstructure 133; a second groove 134; a third groove 135; a second microstructure 136; a light shielding structure 137; an ink layer 138; a light emitting region S110; a light receiving area S120; a light-diverging region P110; a light converging region P120; a light blocking region P130; the depth h1 of the first groove 132; the opening width w1 of the first groove 132; the depth h2 of the second groove 134; the opening width w2 of the second groove 134.

Detailed Description

Currently, the wearing equipment mainly adopts photoplethysmography (Photo Plethysmography, PPG) in the aspect of heart rate monitoring, and is called a photoelectric method for short. The method for monitoring heart rate is based on the principle of absorption of substances to Light, namely, a Light-Emitting Diode (LED) of a wearable device is used for illuminating a blood vessel for a period of time by matching with a Photodiode (PD), and the heart rate is measured according to the absorbance of blood. In particular, when a light beam of a certain wavelength emitted by the LED is irradiated onto the skin surface, the light beam will be transmitted to the PD by transmission or reflection, during which the PD monitors that the intensity of the light will decrease due to attenuation by absorption by skin muscles and blood. The reflection of the human skin, bones, meat, fat and the like to the light is a fixed value, and the capillary vessels and the arteries and veins become smaller along with the continuous increase of the pulse volume under the action of the heart. When the heart contracts, the peripheral blood volume is the largest, the light absorption capacity is the largest, and the light intensity detected by PD is the smallest; whereas during diastole, the light intensity detected by the PD is maximal, so that the light intensity received by the PD is changed in a pulsating manner.

At present, the reflective photoelectric method is the most common method for heart rate monitoring, and the light emitting diode and the photodiode of the reflective photoelectric method are positioned on the same side of the measured part and mainly measure the reflected light. The heart rate measurement method has the advantages of simplicity and convenience, and low requirements on measurement parts, so long as the tissue is smooth and almost all places with little subcutaneous fat can be measured, such as forehead and wrists. Therefore, most wearable devices such as smart bracelets and smart watches use this method to measure heart rate.

The existing wearable equipment with heart rate monitoring function, wherein one side of the light emitting diode and the photodiode, which is opposite to the measured part, is provided with a corresponding LED lens and PD lens. However, the use of the LED lens may cause a small portion of the light emitted by the light emitting diode to be reflected inside the LED lens and not be directly received by the photodiode without passing through the object to be measured, thereby resulting in low accuracy of monitoring data and poor monitoring effect.

In view of this, the embodiment of the application provides an optical film and wearing equipment, has solved because the optical receiver measures the not high problem of monitoring heart rate accuracy that the illumination intensity that is measured the body reflection/transmission of testee leads to. The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

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: light generator 110, light receiver 120, and optical film 130. The light generator 110 has a cylindrical shape, the light receiver 120 has a circular cylinder shape, and the optical film 130 has a wafer 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, and the light blocking region P130 is shown as a diagonal line portion in fig. 1.

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

Fig. 2a is a schematic top view of an optical film according to an exemplary embodiment of the present disclosure. As shown in fig. 2a, the optical film 130 provided in the embodiment of the present application includes: the diaphragm substrate 131, and the shape of the diaphragm substrate 131 is circular. The diaphragm substrate 131 includes a light diverging region P110, a light converging region P120, and a light blocking region P130. Specifically, the light blocking region P130 has at least one first groove 132, and the light blocking region P130 is located between the light emitting region S110 and the light receiving region S120.

In an embodiment of the present application, 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-emitting 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 diaphragm substrate 131 as a center.

It should be emphasized that the light blocking region P130 is used to attenuate the illumination intensity of the disturbing light, which includes the light emitted by the light generator and not reflected by the object to be measured, and is directly received by the light receiver. The effective light rays comprise light rays emitted by the light generator and reflected by the tested body and then received by the light receiver.

FIG. 2b is a schematic cross-sectional view of the optical film of FIG. 2a in the N-N direction. As shown in fig. 2b, a schematic cross-sectional view of the optical film 130 in the N-N direction is shown with the central axis of the film substrate 131 as the center line of symmetry. In an embodiment of the present application, the depth h1 of the first groove 132 is greater than the opening width w1 of the first groove 132 on the surface of the membrane substrate 131, and the opening width w1 of the first groove 132 on the surface of the membrane substrate 131 is the radial dimension of the first groove 132 on the opening surface of the membrane substrate 131.

In one embodiment of the present application, the first recess 132 comprises an annular recess, at least one of which is arranged to annularly surround the light-diverging region P110. Illustratively, the first grooves 132 are spaced apart from each other along the center of the diaphragm 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 at least one first groove. Through setting up first groove structure, increased the reflection and the refraction number of times of disturbing light in the optics diaphragm to weaken the illumination intensity of disturbing light, effectively blockked the disturbing light that is received by the optical receiver, partly blockked simultaneously at the back lid glass-air interface of wearing equipment and/or diaphragm base plate-air interface reflection disturbing light, thereby improved the light duty cycle that the measured body reflection was received by the optical receiver, and then improved heart rate monitoring data's rate of accuracy.

Illustratively, the opening width w1 of the first recess 132 may be 5 μm to 50 μm, preferably 20 μm; the depth h1 of the first groove 132 may be equal to the thickness of the membrane substrate 131 or may be smaller than the thickness of the membrane substrate 131, and preferably, the depth h1 of the first groove 132 is smaller than the thickness of the membrane substrate 131 by 5 μm. It is emphasized that the ratio of the depth h1 of the first groove 132 to the opening width w1 of the first groove 132 is preferably 5.

In an embodiment of the present application, the material of the membrane substrate 131 may be polyester resin (Polyethylene terephthalate, PET) or Polycarbonate (PC), and the thickness of the membrane substrate 131 is preferably 100 μm to 200 μm.

The shape and location of the first recess 132 is described in detail below in connection with fig. 3a and 3 b.

Fig. 3a is a schematic cross-sectional view of a first groove according to an exemplary embodiment of the present application. As shown in fig. 3a, the cross-sectional shape of the first groove 132 along the N-N direction of the optical film shown in fig. 2a includes any one of a rectangle, a trapezoid, and a triangle, and the cross-sectional shape of the first groove 132 may be set according to actual needs, which is not further limited in the embodiment of the present application.

Fig. 3b is a schematic top view of the first groove shown in fig. 3 a. As shown in fig. 3b, the top view shape of the first groove 132 includes a plurality of concentric circles, or a region between any two adjacent concentric circles in the plurality of concentric circles is divided into a plurality of arc regions, or each circle in the plurality of concentric circles is divided into a plurality of arcs, wherein the plurality of arcs form an intermittent circle; the top view shape of the first groove 132 further includes a plurality of closed irregular curves sequentially arranged from inside to outside along the center of the diaphragm substrate 131, or each of the plurality of irregular curves is divided into a plurality of irregular sub-curves, wherein the plurality of irregular sub-curves form a discontinuous irregular curve; the top view shape of the first recess 132 also includes an oval or rectangle, which is not further limited in the embodiments of the present application.

Illustratively, the spacing between adjacent first 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. 4a is a schematic top view of an optical film according to another exemplary embodiment of the present application. FIG. 4b is a schematic cross-sectional view of the optical film of FIG. 4a in the N-N direction. The embodiments shown in fig. 4a and fig. 4b of the present application are extended from the embodiments shown in fig. 2a and fig. 2b of the present application, and differences between the embodiments shown in fig. 4a and fig. 4b and the embodiments shown in fig. 2a and fig. 2b are mainly described below, and the details of the differences are not repeated.

As shown in fig. 4a and 4b, the film substrate 131 further includes a light converging region P120 having a first microstructure 133, where the light converging region P120 corresponds to the light receiving region S120.

In an embodiment of the present application, the first microstructures 133 may be configured as first fresnel structures. The first microstructures 133 are used for converging light to increase the light receiving rate of the light receiver 120. Specifically, the first fresnel structure allows more light to be received by the light receiver 120.

In an embodiment of the present application, the shape of the first microstructure 133 may be tooth-shaped, spherical, non-spherical or conical, which is not further limited in the embodiment of the present application, so long as the light can be converged. In addition, the distance between two adjacent first microstructures 133 may be 10 μm to 200 μm, preferably 10 μm to 80 μm. For example, if the first microstructures 133 are tooth-like in shape, the distance between two adjacent first microstructures 133 is the distance between two adjacent teeth; if the first microstructures 133 are pyramids, the distance between two adjacent first microstructures 133 is the center-to-center distance of the two adjacent pyramids. In addition, the depth of the first microstructures 133 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 first microstructure, and light reflected by a measured body is converged through the first microstructure, so that the light receiver receives more effective light, and the accuracy of heart rate monitoring data is improved.

Fig. 5 is a schematic cross-sectional view of an optical film according to another exemplary embodiment of the present application. The embodiment of fig. 5 extends from the embodiments of fig. 2a and 2b of the present application, and differences between the embodiment of fig. 5 and the embodiment of fig. 2a and 2b are mainly described below, and are not repeated.

As shown in fig. 5, the film substrate 131 further includes a light converging region P120 having at least one second groove 134, where the light converging region P120 corresponds to the light receiving region S120, a depth h2 of the second groove 134 is greater than an opening width w2 of the second groove 134 on the surface of the film substrate 131, and the opening width w2 of the second groove 134 on the surface of the film substrate 131 is a radial dimension of the second groove 134 on the opening surface of the film substrate 131. Illustratively, the ratio of the depth h2 of the second groove 134 to the opening width w2 of the second groove 134 may be any value from 1 to 10, preferably 4.

In one embodiment of the present application, the cross section of the second groove 134 taken along the direction N-N in fig. 2a is the cross section of the second groove 134. Illustratively, the cross-sectional shape of the second groove 134 may be rectangular, trapezoidal or triangular, and the cross-sectional shape of the second groove 134 may be set according to actual needs, which is not further limited in the embodiments of the present application.

In addition, the second grooves 134 may have a circular, elliptical or rectangular top view shape, and the spacing between adjacent second grooves 134 may be 5 μm to 100 μm, preferably 10 μm to 25 μm, which is not further limited in the embodiment of the present application.

The optical film provided by the embodiment of the application comprises a light converging area with at least one second groove, and the second groove structure is arranged to shield light reflected to the optical fiber converging area and with a relatively biased angle, and meanwhile interference light reflected at a rear cover glass-air interface and/or a film substrate-air interface of the wearing equipment is blocked, so that the light ratio of the light received by the light receiver and reflected by a measured body is improved, and the accuracy of heart rate monitoring data is further improved.

Fig. 6a is a schematic top view of an optical film according to another exemplary embodiment of the present application. FIG. 6b is a schematic cross-sectional view of the optical film of FIG. 6a in the N-N direction. The embodiments shown in fig. 6a and 6b of the present application are extended from the embodiments shown in fig. 4a and 4b of the present application, and differences between the embodiments shown in fig. 6a and 6b and the embodiments shown in fig. 4a and 4b are mainly described below, and are not repeated.

As shown in fig. 6a and 6b, at least one third groove 135 is further disposed within a predetermined range of the periphery of the light converging region P120. In an embodiment of the present application, the third grooves 135 may be annular grooves, and at least one third groove 135 is disposed to annularly surround the light converging region P120. The third groove 135 at the periphery of the light converging region P120 may correspond to the first groove 132 of the light blocking region P130.

In particular, the third groove 135 is used to attenuate the illumination intensity of the disturbing light. In addition, the preset range may be set according to actual needs, which is not further limited in the embodiments of the present application.

According to the optical film provided by the embodiment of the application, at least one third groove is formed in the peripheral preset range of the light converging area, light reflected to the optical fiber converging area, with a relatively biased angle, is shielded, the illumination intensity of interference light is weakened, the light ratio of the light received by the light receiver and reflected by the measured body is improved, and the accuracy of heart rate monitoring data is further improved.

Fig. 7a is a schematic top view of an optical film according to another exemplary embodiment of the present disclosure. FIG. 7b is a schematic cross-sectional view of the optical film of FIG. 7a in the N-N direction. The embodiments shown in fig. 7a and 7b of the present application are extended from the embodiments shown in fig. 6a and 6b of the present application, and differences between the embodiments shown in fig. 7a and 7b and the embodiments shown in fig. 6a and 6b are mainly described below, and are not repeated.

As shown in fig. 7a and 7b, the film substrate 131 further includes a light-diverging region P110 having a second microstructure 136, wherein the light-diverging region P110 corresponds to the light-emitting region S110.

In an embodiment of the present application, the second microstructures 136 may be configured as second fresnel structures. The second microstructure 136 is used to deflect the angle of the light emitted from the light generator 110 to increase the illuminated area of the object and the absorbed light energy. Specifically, the second fresnel structure is used for diverging the central light emitted by the light generator 110 to increase the illuminated area of the object to be measured, and is also used for converging the light emitted by the light generator 110 with a more biased angle to increase the light energy absorbed by the object to be measured.

In an embodiment of the present application, the shape of the second microstructure 136 may be tooth-shaped, spherical, non-spherical, or conical, which is not further limited in the embodiment of the present application, so long as the light can be deflected. In addition, the distance between two adjacent second microstructures 136 may be 10 μm to 200 μm, preferably 10 μm to 80 μm. For example, if the shape of the second microstructures 136 is a tooth shape, the distance between two adjacent second microstructures 136 is the distance between two adjacent teeth; if the second microstructures 136 are pyramids, the distance between two adjacent second microstructures 136 is the center-to-center distance of the two adjacent pyramids. In addition, the depth of the second microstructure 136 may be 1 μm to 50 μm, preferably 1 μm to 20 μm.

In one embodiment of the present application, as shown in fig. 7b, the membrane substrate 131 includes a microstructure forming layer 1311, a base layer 1312, and an adhesive layer 1313, which are sequentially stacked. Specifically, the microstructure forming layer 1311 includes UV paste, and the first microstructures 133 and the second microstructures 136 are formed by UV paste imprint curing. The adhesive layer 1313 includes OCA optical adhesive for adhering the optical film 130 to the surface of the wearable device 100, for example, adhering the optical film 130 to the back cover surface of the smart watch with OCA optical adhesive. The material of the substrate layer 1312 includes one or a combination of PET material, PC material, PMMA material, and PC composite material.

The optical film provided by the embodiment of the application comprises a light divergence area with a second microstructure, the central light emitted by the light generator is diverged through the second microstructure, the illuminated area of a detected body is increased, the light emitted by the light generator and with a more deviated angle is furled by the second microstructure, the light energy absorbed by the detected body is increased, so that the illumination power of the light generator can be reduced under the same condition, the power consumption of the light generator is reduced, and the cruising experience of wearing equipment is improved. In addition, the optical film provided by the application integrates a light emitting area, a light blocking area and a light receiving area, and accuracy of heart rate monitoring data is improved. In addition, the optical film provided by the application is simple in structure, and only needs to be attached to the rear cover of the wearing equipment, so that the step of respectively configuring lenses in the light emitting area and the light receiving area is omitted. The thickness of the optical film provided by the application can be set according to actual needs, and is preferably smaller than 0.2mm, so that the light and thin experience of the wearing equipment can be improved.

Fig. 8a is a schematic top view of an optical film according to another exemplary embodiment of the present disclosure. FIG. 8b is a schematic cross-sectional view of the optical film of FIG. 8a in the N-N direction. The embodiments shown in fig. 8a and 8b of the present application are extended from the embodiments shown in fig. 7a and 7b of the present application, and differences between the embodiments shown in fig. 8a and 8b and the embodiments shown in fig. 7a and 7b are mainly described below, and are not repeated.

As shown in fig. 8a and 8b, a light shielding structure 137 is disposed in the first recess 132, and the light shielding structure 137 is represented by a black ring-shaped filling pattern. In an embodiment of the present application, the light shielding structure 137 may be disposed in the second recess 134 and the third recess 135 as required.

Specifically, the light shielding structure 137 may be black light shielding ink for blocking light emitted from the light generator 110 and reflected within the diaphragm substrate 131. The black shading ink may fill the first groove 132, or may partially fill the first groove 132, preferably fill the first groove 132, so as to block the light emitted from the light generator 110 and reflected in the membrane substrate 131 to the greatest extent.

The optical film that this embodiment provided has effectively blockked the light that light generator sent, at diaphragm base plate internal reflection through set up the shading structure in first recess to avoided the light that light generator sent directly by the phenomenon that light receiver received, weakened the illumination intensity of interference light, prevented that interference light from flooding not effective light, thereby improved heart rate monitoring data's rate of accuracy.

Fig. 9a is a schematic top view of an optical film according to another exemplary embodiment of the present disclosure. FIG. 9b is a schematic cross-sectional view of the optical film of FIG. 9a in the N-N direction. FIG. 9c is a schematic cross-sectional view of another optical film shown in FIG. 9a in the N-N direction. The embodiments shown in fig. 9a, 9b and 9c of the present application are extended from the embodiments shown in fig. 8a and 8b of the present application, and differences between the embodiments shown in fig. 9a, 9b and 9c and the embodiments shown in fig. 8a and 8b are described below for emphasis, and the same points are not repeated.

In an embodiment of the present application, as shown in fig. 9b, an ink layer 138 (shown as a hatched grid) is provided on the upper side of the third groove 135. In other embodiments, if the membrane substrate 131 includes the adhesive layer 1313, after the ink layer 138 is provided on the surface of the substrate layer 1312 on the side away from the microstructure forming layer 1311, the adhesive layer 1313 is provided on the surface of the substrate layer 1312 on the side away from the microstructure forming layer 1311.

In one embodiment of the present application, as shown in fig. 9c, if the membrane substrate 131 does not include the adhesive layer 1313, the ink layer 138 is disposed on the surface of the base material layer 1312 on the side away from the microstructure forming layer 1311. In other embodiments, an ink layer 138 (not shown) may also be provided on the upper side of the third groove 135. Preferably, the ink layer 138 is configured with a silk-screen black ink, and the black ink is attached to the upper side of the third groove 135 and the surface of the substrate layer 1312 through a silk-screen process, so that the effect of blocking the light emitted by the light generator and reflected in the membrane substrate is improved, the phenomenon that the light emitted by the light generator is directly received by the light receiver is avoided, the illumination intensity of the interference light is weakened, the interference light is prevented from flooding with ineffective light, and the accuracy of heart rate monitoring data is further improved.

Next, a wearable device according to an embodiment of the present application is described with reference to fig. 10. Fig. 10 is a schematic structural diagram of a wearable device according to an exemplary embodiment of the present application.

As shown in fig. 10, the wearable device 100 includes a light generator 110 and a light receiver 120, and an optical film 130 provided as in any of the embodiments described above.

Of course, for simplicity, only some of the components of the wearable device 100 that are relevant to the present application are shown in fig. 10. In addition, the wearable device 100 may include any other suitable components, depending on the particular application.

It should be noted that, the sizes and proportional relationships of the lines and the figures in fig. 1 to 10 are set for convenience of description, and do not represent actual sizes and proportional relationships.

The basic principles of the present application have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not limiting, and these advantages, benefits, effects, etc. are not to be considered as necessarily possessed by the various embodiments of the present application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not intended to be limited to the details disclosed herein as such.

The block diagrams of the devices, apparatuses, devices, systems referred to in this application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

It is also noted that in the apparatus, devices and methods of the present application, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent to 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, this description is not intended to limit the embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

Claims (10)

1. An optical film for use in a wearable device comprising a light generator and a light receiver, the optical film comprising:

a membrane substrate;

the diaphragm substrate comprises a light blocking area with at least one first groove, the light blocking area is located between a light emitting area corresponding to the light generator and a light receiving area corresponding to the light receiver, the light blocking area is used for weakening illumination intensity of interference light, and the interference light comprises light emitted by the light generator and not reflected by a tested body and directly received by the light receiver.

2. The optical film of claim 1, wherein the film substrate further comprises a light converging region having a first microstructure, wherein the light converging region corresponds to the light receiving region, and wherein the first microstructure is configured to converge light to increase the light receiving rate of the light receiver.

3. The optical film of claim 1, wherein the film substrate further comprises a light converging region having at least one second groove, wherein the light converging region corresponds to the light receiving region, and wherein the second groove has a depth greater than an opening width of the second groove at a surface of the film substrate.

4. An optical film as recited in claim 2 or claim 3, wherein at least one third groove is further disposed within a predetermined range of the periphery of the light converging region, and the third groove is configured to attenuate the illumination intensity of the interfering light.

5. An optical film as recited in any one of claims 1-3, wherein the film substrate further comprises a light diverging region having a second microstructure, wherein the light diverging region corresponds to the light emitting region, the second microstructure being configured to deflect the angle of light emitted by the light generator to increase the illuminated area and absorbed light energy of the object.

6. The optical film of claim 5, wherein the light blocking region is configured to annularly surround the light diverging region and the light converging region is configured to annularly surround the light blocking region.

7. An optical film as recited in any one of claims 1-3, wherein a light shielding structure is disposed within the first recess, the light shielding structure being configured to block light emitted by the light generator that is reflected within the film substrate.

8. An optical film as recited in any one of claims 1-3, wherein a depth of the first groove is greater than an opening width of the first groove at a surface of the film substrate.

9. An optical film as recited in any one of claims 1-3, wherein the first groove comprises an annular groove, at least one of the annular grooves being configured to annularly surround the light diverging region.

10. A wearable device comprising a light generator and a light receiver, and an optical film as claimed in any one of claims 1 to 9.