CN109725380B - Light guide plate and preparation method thereof, rubber coating jig, optical sensor and electronic equipment - Google Patents
Light guide plate and preparation method thereof, rubber coating jig, optical sensor and electronic equipment Download PDFInfo
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- CN109725380B CN109725380B CN201910014177.XA CN201910014177A CN109725380B CN 109725380 B CN109725380 B CN 109725380B CN 201910014177 A CN201910014177 A CN 201910014177A CN 109725380 B CN109725380 B CN 109725380B
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Abstract
The invention provides a light guide plate and a preparation method thereof, a rubber coating jig, an optical sensor and electronic equipment, and relates to the field of optical sensors, wherein the light guide plate comprises the following components: the light guide plate main body comprises an incidence surface, a transmission surface, a scattering surface and a reflecting layer, wherein the transmission surface is arranged opposite to the incidence surface, the scattering surface is arranged between the incidence surface and the transmission surface, and the reflecting layer covers the surface of the scattering surface; wherein, the refractive index of the reflecting layer is lower than that of the light guide plate main body. The light guide plate can solve the problem of low sensitivity of the recognition system caused by low light transmittance of the light guide plate in the conventional face recognition system, and achieves the technical effect of improving the sensitivity of the face recognition system.
Description
Technical Field
The invention relates to the field of optical sensors, in particular to a light guide plate and a preparation method thereof, a rubber coating jig, an optical sensor and electronic equipment.
Background
With the widespread application of mobile terminals (mobile phones, tablet computers, etc.), the applications that the mobile terminals can support are increasing, the functions are increasing, and the mobile terminals are developing towards diversification and individuation, and become indispensable electronic products in the life of users. With the development of the technology, the application of the face recognition technology is more and more popular, and the application scenes comprise a face recognition lock, a face recognition attendance system, a face recognition login of a mobile phone APP and the like. The biggest characteristic of face recognition is that the face recognition is safer, more secret and more convenient. And the unique activity discrimination capability of the face recognition ensures that others cannot cheat the recognition system by inactive photos, puppets, wax figures and even heads and cannot counterfeit.
In face recognition systems, there is an important component, ambient light sensor, which has a significant impact on the imaging quality. In the ambient light sensor, the transmittance of the light guide plate for transmitting light directly affects the sensitivity of the ambient light sensor. Because the sensitivity of the identification system is ensured, the light guide plate is ensured to have larger light transmittance along the light transmission direction, and the light is prevented from being greatly scattered, refracted and the like in the light guide plate to reduce the light transmittance.
In the existing light guide plate, light guide points are arranged on a light guide plate main body, and the light guide plate uniformly emits light by using the density and the size of the light guide points. The light guide plate with the structure has high light scattering rate and low light transmittance along the light transmission direction, and is not suitable for being applied to an ambient light sensor.
Disclosure of Invention
A first object of the present invention is to provide a light guide plate for developing a light guide plate suitable for use in a high-sensitivity ambient light sensor for use in a face recognition system.
The second objective of the present invention is to provide an encapsulation jig for manufacturing the light guide plate, which can improve the production efficiency and yield of the light guide plate.
A third object of the present invention is to provide a method for manufacturing a light guide plate, by which a four-sided encapsulated light guide plate can be manufactured.
A fourth object of the present invention is to provide a light sensor that can solve the problem of low sensitivity of the current ambient light sensor.
A fifth object of the present invention is to provide an electronic device including the optical sensor, which can improve the sensitivity of the face recognition function.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
a light guide plate comprising:
a light guide plate body including an incident surface, a transmission surface disposed opposite to the incident surface, and a scattering surface interposed between the incident surface and the transmission surface, an
The reflecting layer covers the surface of the scattering surface;
the refractive index of the light reflecting layer is lower than that of the light guide plate body, and preferably, the refractive index of the light reflecting layer is lower than that of the light guide plate body by more than 0.2.
An encapsulation jig for preparing a light guide plate, comprising:
two transparent substrates including a first transparent substrate and a second transparent substrate, an
A supporter disposed between the two transparent substrates, for supporting the light guide plate body and separating the light guide plate body from the two transparent substrates;
and anti-sticking coating layers are arranged on one surfaces of the two transparent substrates facing the supporting piece.
A method for preparing a light guide plate comprises the following steps:
s1), providing the encapsulation jig, and placing N light guide plate main bodies on the first transparent substrate through a support piece, wherein N is a natural number not less than 1;
s2), coating a reflecting layer glue solution to immerse the light guide plate main body with the reflecting layer glue solution;
s3) covering a second transparent substrate, and enabling the second transparent substrate to be in contact with the reflecting layer glue solution;
s4) solidifying the reflecting layer glue solution, and forming a reflecting layer on the surface of the light guide plate main body;
s5) removing the encapsulation jig to obtain the light guide plate.
A method for preparing a light guide plate comprises the following steps:
s1) providing the encapsulation jig, placing N light guide plate main bodies on the first transparent substrate through a support, wherein N is a natural number not less than 1; then the second transparent substrate is covered, and the sealing strip is used for sealing to form an accommodating space for accommodating the light guide plate main body;
s2) injecting a reflective layer glue solution into the accommodating space from the glue injection port, so that the reflective layer glue solution is immersed in the light guide plate main body;
s3) solidifying the reflecting layer glue solution, and forming a reflecting layer on the surface of the light guide plate main body;
s4) removing the encapsulation jig to obtain the light guide plate.
An optical sensor comprises the light guide plate.
An electronic device comprising the light sensor.
Compared with the prior art, the invention has the following beneficial effects:
the light guide plate provided by the invention comprises a light guide plate main body and a reflecting layer, wherein the light guide plate main body comprises an incident surface, a transmission surface and a scattering surface, the transmission surface is arranged opposite to the incident surface, the scattering surface is arranged between the incident surface and the transmission surface, and the reflecting layer covers the surface of the scattering surface. The preset transmission direction of the light rays enters from the incident surface and is emitted from the transmission surface, and after the light rays enter the light guide plate main body from the incident surface, the light rays can be emitted from the scattering surface between the incident surface and the transmission surface due to the scattering, refraction and other effects of the light guide plate main body on the light rays. In the invention, because the reflecting layers are arranged on the scattering surfaces, and the refractive index of the reflecting layers is lower than that of the light guide plate main body, under the action of the reflecting layers, light can meet the total reflection principle when entering the reflecting layers from the light guide plate main body at a certain angle, light enters the optically thinner medium from the optically denser medium and is reflected back to the optically denser medium, and particularly, when the refractive index of the reflecting layers is lower than that of the light guide plate main body by more than 0.2, the reflecting effect is better, so that the light attenuation is reduced, and the light emitted from the scattering surfaces is reflected into the light guide plate main body again for transmission. Therefore, the light guide plate provided by the invention can reduce the loss of light to the greatest extent structurally, so that the light-transmitting plate has higher light transmittance. The light guide plate is applied to the ambient light sensor, so that the sensitivity of the ambient light sensor can be obviously improved, and the sensitivity of a human image recognition system is further improved.
When the encapsulation jig is used for preparing the light guide plate, the light guide plate main body is placed on the first transparent substrate through the supporting piece, then the reflecting layer glue solution is coated, the reflecting layer glue solution is soaked in the light guide plate main body and then covers the second transparent substrate for curing, and the light guide plate is obtained after curing and demolding are finished; or, after the light guide plate main body is placed on the first transparent substrate through the supporting piece, the first transparent substrate and the second transparent substrate are covered, then the reflecting layer glue solution is poured between the first transparent substrate and the second transparent substrate, and after the light guide plate main body is solidified, the mold is removed to obtain the light guide plate. In order to realize demoulding, the surfaces of the two transparent substrates facing the support piece are respectively provided with an anti-sticking film coating layer, so that when the first transparent substrate and the second transparent substrate are dismantled, the reflecting layer can be prevented from being stuck on the two transparent substrates.
The preparation method provided by the invention can realize the integral coating of the scattering surface of the light guide plate main body, is efficient and quick, has seamless connection between the reflecting layers coated on the scattering surfaces of the light guide plate, has good coating performance and no light leakage problem, and can integrally improve the light transmittance of the light guide plate along the light transmission direction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a light guide plate provided in embodiment 1;
fig. 2 is a schematic structural view of a light guide plate body in embodiment 1;
fig. 3 is a schematic structural diagram of a rubber coating jig provided in embodiment 2 of the present invention;
FIG. 4 is a schematic view of the combination structure of the transparent cover plate and the supporting member in embodiment 2 of the present invention;
fig. 5 is a schematic structural view of a base in embodiment 2 of the present invention;
FIG. 6 is a schematic view of a structure of a glass sheet after dispensing in a gap according to example 3 of the present invention;
fig. 7 is a schematic structural view of a second transparent glass substrate covered in embodiment 3 of the present invention;
fig. 8 is a schematic structural diagram of a glass strip assembly obtained after removing the encapsulation jig in embodiment 3 of the present invention;
fig. 9 is a schematic structural view of a rubber-coated jig provided in embodiment 4 of the present invention;
fig. 10 is a schematic structural diagram of a light guide plate provided in embodiment 10 of the present invention.
Icon: 10-a light guide plate body; 101-an incident plane; 102-a transmission face; 103-a scattering surface; 20-a light-reflecting layer; 21-shading protective layer; 30-encapsulating the jig; 301-a first transparent glass substrate; 302-a second transparent glass substrate; 3021-lateral; 303-UV debonding double-sided adhesive tape; 304-reflecting layer glue solution; 305-a seal; 40-a base; 401-a frame shaped like a Chinese character 'hui'; 402-locating blocks.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In one aspect, the present invention provides a light guide plate, comprising:
a light guide plate body including an incident surface, a transmission surface disposed opposite to the incident surface, and a scattering surface interposed between the incident surface and the transmission surface, an
The reflecting layer covers the surface of the scattering surface;
wherein the refractive index of the light reflecting layer is lower than that of the light guide plate body.
The light guide plate provided by the invention comprises a light guide plate main body and a reflecting layer, wherein the light guide plate main body comprises an incident surface, a transmission surface and a scattering surface, the transmission surface is arranged opposite to the incident surface, the scattering surface is arranged between the incident surface and the transmission surface, and the reflecting layer covers the surface of the scattering surface. The preset transmission direction of the light rays enters from the incident surface and is emitted from the transmission surface, and after the light rays enter the light guide plate main body from the incident surface, the light rays can be emitted from the scattering surface between the incident surface and the transmission surface due to the scattering, refraction and other effects of the light guide plate main body on the light rays. In the invention, because the reflecting layers are arranged on the scattering surfaces, and the refractive index of the reflecting layers is lower than that of the light guide plate main body, under the action of the reflecting layers, light can meet the total reflection principle when entering the reflecting layers from the light guide plate main body at a certain angle, light enters the optically thinner medium from the optically denser medium and is reflected back to the optically denser medium, and particularly, when the refractive index of the reflecting layers is lower than that of the light guide plate main body by more than 0.2, the reflecting effect is better, so that the light attenuation is reduced, and the light emitted from the scattering surfaces is reflected into the light guide plate main body again for transmission. Therefore, the light guide plate provided by the invention can reduce the loss of light to the greatest extent structurally, so that the light-transmitting plate has higher light transmittance. The light guide plate is applied to the ambient light sensor, so that the sensitivity of the ambient light sensor can be obviously improved, and the sensitivity of a human image recognition system is further improved.
In some embodiments of the present invention, the light guide plate body is preferably a regular rectangular parallelepiped structure, and is divided into three directions, i.e., a length direction, a width direction and a height direction, so as to facilitate processing and manufacturing. If the length direction of the light guide plate cylinder is defined as the light transmission direction, one wide and high surface of the light guide plate body is an incident surface, the other wide and high surface is a transmission surface, and the long and high surface of the light guide plate body is a scattering surface. The light guide plate comprises a light guide plate main body with the structure, wherein the incident surface and the transmission surface are oppositely arranged, and the reflecting layer covers the surface of the scattering surface.
In some embodiments of the present invention, in order to improve the reflection effect of the reflective layer, more light can enter the light guide plate body again, and the refractive index of the reflective layer is lower than that of the light guide plate body by more than 0.2, for example, by 0.2, 0.22, 0.25, 0.27, 0.3, 0.32, 0.35, 0.37 or 0.4.
In some embodiments of the present invention, the light guide plate body is made of glass or light-transmissive polymer, and the transparent polymer material may be polymethyl methacrylate PMMA, for example. When the light guide plate main body material is selected, a material with high light transmittance is selected as much as possible, for example, the selected glass or polymer material can enable the light transmittance of the light guide plate main body to be larger than or equal to 90% so as to improve the light transmittance of the light guide plate main body.
In some embodiments of the present invention, the material used for the light reflecting layer is UV glue. The reflecting layer prepared by using the UV adhesive is a UV polymer. When the UV adhesive is selected, specific UV adhesive is selected according to the refractive index of the light guide plate selected actually, and the refractive index of the finally obtained UV polymer is smaller than that of the light guide plate. For example, a UV glue with a refractive index of 1.38-1.42 may be selected, and a glass with a refractive index of 1.6 or more may be selected to match it.
The thickness of the reflective layer can be set according to the size of the reflector body, and when the reflective layer is used in equipment such as a tablet personal computer or a mobile phone, the thickness of the reflective layer can be 0.1-0.2 mm, for example.
In some embodiments of the present invention, the light-reflective layer has a surface roughness of 50nm or less. By limiting the surface roughness of the reflective layer, whether bubbles exist in the reflective layer can be clearly observed in the product inspection process in the preparation process, problems can be found in time, and unqualified products can be removed.
In some embodiments of the present invention, the light guide plate further includes a light blocking protective layer formed on a surface of the light reflecting layer.
The shading protective layer is arranged on the surface of the reflective layer, so that the reflective layer can be protected from being scratched when being installed. In other preferred embodiments of the present invention, the light-shielding protective layer is a black light-shielding protective layer, and the black light-shielding protective layer is selected to not only protect the light-reflecting layer from being scratched, but also prevent light in the environment from entering the light guide plate from the side where the scattering surface is located, and thus, prevent the light from interfering with the imaging system. The light shading protective layer is made of materials which have certain hardness except for considering the light shading property, namely, a shell is arranged outside the light guide plate and can be connected with other elements through the light shading protective layer during installation, so that the main body or the reflecting layer of the light guide plate is prevented from being damaged during installation, and the installation of the light guide plate is facilitated. For example, the light-shielding protective layer may be perforated for mounting or coated with an adhesive for connection with other components during mounting.
In some embodiments of the present invention, the surface roughness of the light blocking protective layer is 100-300 nm. By limiting the surface roughness of the light-shielding protective layer, it is possible to prevent scratches or surface adhesion of foreign matter which are easily caused by excessively low surface roughness, and poor appearance caused by excessively high surface roughness.
In a second aspect, the present invention provides an encapsulating jig for manufacturing the above light guide plate, the encapsulating jig comprising:
two transparent substrates including a first transparent substrate and a second transparent substrate, an
A supporter disposed between the two transparent substrates, for supporting the light guide plate body and separating the light guide plate body from the two transparent substrates;
wherein, two transparent substrate face support piece's one side all is equipped with antiseized coating film layer.
When the encapsulation jig is used for preparing the light guide plate, the light guide plate main body is placed on the first transparent substrate through the supporting piece, then the reflecting layer glue solution is coated, the reflecting layer glue solution is soaked in the light guide plate main body and then covers the second transparent substrate for curing, and the light guide plate is obtained after curing and demolding are finished; or, after the light guide plate main body is placed on the first transparent substrate through the supporting piece, the first transparent substrate and the second transparent substrate are covered, then the reflecting layer glue solution is poured between the first transparent substrate and the second transparent substrate, and after the light guide plate main body is solidified, the mold is removed to obtain the light guide plate. In order to realize demoulding, the surfaces of the two transparent substrates facing the support piece are respectively provided with an anti-sticking film coating layer, so that when the first transparent substrate and the second transparent substrate are dismantled, the reflecting layer can be prevented from being stuck on the two transparent substrates.
In the invention, the supporting piece not only plays a role of supporting the position of the light guide plate main body to separate the light guide plate main body from the first transparent substrate and the second transparent substrate, but also plays a role of fixing the light guide plate main body. The support may be a member integrated with the first transparent substrate or the second transparent substrate, for example, a boss integrated with the transparent substrate, the boss being provided with a groove for placing the light guide plate body; the support may also be a separate member. When the supporting member is a member integrated with the first transparent substrate or the second transparent substrate, the surface of the supporting member is also provided with an anti-sticking coating layer.
The raw material composition of the anti-sticking film coating layer is the same as that of the anti-fingerprint film coating layer in the mobile phone glass panel, and the anti-sticking film coating layer is a fluorine-containing compound and has good hydrophobicity, oleophobicity and anti-sticking property. The thickness of the release coating layer may be, for example, an AS waterproof antifouling film.
In the invention, the first transparent substrate and the second transparent substrate are both of a flat structure, and the surfaces of the first transparent substrate and the second transparent substrate are flat surfaces, so that a light reflecting layer with a flat and smooth surface can be obtained. The material of the first transparent substrate and the second transparent substrate is not particularly limited as long as the first transparent substrate and the second transparent substrate have certain hardness and light transmittance, and for example, the material may be glass or a high molecular polymer material.
In some embodiments of the present invention, the first transparent substrate and the second transparent substrate each have a surface roughness of 5 to 20 nm. Through the surface roughness who prescribes a limit to first transparent substrate and second transparent substrate, can improve the surface roughness of the reflection of light layer and the surface roughness of reflection of light layer that effective control obtained, simultaneously, can also observe the condition in the reflection of light layer formation process more clearly.
In some preferred embodiments of the present invention, the support is a UV-debonding double-sided adhesive tape or a heat-debonding double-sided adhesive tape, preferably a UV-debonding double-sided adhesive tape.
UV debonding double-sided tape: the adhesive layer in the adhesive tape is sticky without UV irradiation; the adhesive layer in the tape loses adhesion when subjected to UV irradiation.
Adding a thermal adhesive double-sided tape: the adhesive layer in the adhesive tape is sticky without being heated, for example, at the normal temperature of 10-40 ℃; the adhesive layer in the tape loses its adhesion when heated to a certain temperature, for example, 60-80 ℃.
And the UV debonding double-sided adhesive tape or the heating debonding double-sided adhesive tape is selected, so that the demolding is convenient. When the UV debonding double-sided adhesive tape or the heating debonding double-sided adhesive tape is selected as the supporting piece, a group of adhesive tapes are respectively fixed on the first transparent substrate, then the light guide plate main body is fixed on the surfaces of the group of adhesive tapes, and the sticking positions of the adhesive tapes are close to two ends of the light guide plate main body; and then fixing another group of adhesive tapes on the other surface of the light guide plate body for bonding a second transparent substrate.
When the UV debonding double-sided adhesive tape or the heating debonding double-sided adhesive tape is selected as the support, the thickness of the reflective layer after coating is determined by the thickness of the adhesive tape.
In some preferred embodiments of the present invention, the support is a UV-debonding double-sided adhesive tape. The UV debonding double-sided adhesive tape can be matched with the UV adhesive. When the UV adhesive is coated or injected, the UV debonding double-sided adhesive tape has viscosity, and the UV adhesive is in a flowing state and has lower viscosity. After UV irradiation, the UV glue is cured and bonded with the light guide plate main body, and the UV debonding double-sided adhesive tape loses the viscosity at the moment. When the mold is removed, the adhesive tape is only needed to be torn off lightly. Therefore, when the UV adhesive is selected to prepare the reflecting layer, the UV debonding double-sided adhesive tape can be matched with the UV debonding double-sided adhesive tape, so that a secondary processing technology caused by demolding is avoided, convenience and rapidness are realized, and the production effect is high.
The encapsulation tool of an embodiment of the invention comprises:
two transparent substrates, a first transparent substrate and a second transparent substrate, and
the UV debonding double-sided adhesive tape is suitable for being respectively adhered to the first transparent substrate and the second transparent substrate by a group of UV debonding double-sided adhesive tapes and used for supporting the light guide plate main body and separating the light guide plate main body from the two transparent substrates;
wherein, two transparent substrate face support piece's one side all is equipped with antiseized coating film layer.
In some preferred embodiments of the present invention, the encapsulation jig includes a base for fixing the position of the first transparent substrate, and the base includes a frame shaped like a Chinese character 'hui', and a positioning block disposed on a surface of the frame shaped like a Chinese character 'hui'. The middle of the square frame body is of a hollow structure, UV light irradiation is facilitated, the positions of the two transparent substrates can be limited by the positioning blocks, slippage of the transparent substrates in the operation process is prevented, and positioning and guiding effects are achieved on the transparent substrates. For example, when the positioning blocks are arranged, the positioning blocks may be distributed in an L shape at four corners of the surface of the frame body.
In some embodiments of the present invention, a sealing member is included, the sealing member and the two transparent substrates at least form an accommodating space, the supporting member is located in the accommodating space, and a glue injection port is arranged on one side of the supporting member.
The encapsulation jig of the embodiment comprises two transparent substrates, a supporting piece and a sealing piece, wherein the supporting piece is placed between the two transparent substrates and used for supporting the light guide plate main body to enable the light guide plate main body to be separated from the two transparent substrates, the sealing piece is used for sealing a gap between the two transparent substrates and enabling the supporting piece to be placed in an accommodating space formed by the two transparent substrates and the sealing piece, a glue injection port is formed in the sealing piece, when the encapsulation jig is used for encapsulation, the light guide plate main body is fixed on the supporting piece, glue is injected into the accommodating space through the glue injection port, and therefore encapsulation of the light guide plate main body is completed. The four-side encapsulation of the light guide plate can be realized by using the encapsulation jig, the encapsulation is uniform, and the productivity is high; simultaneously, because two transparent substrates all are equipped with antiseized coating film layer towards the one side of support piece, consequently, this rubber coating tool is changeed in the drawing of patterns after the rubber coating is accomplished, and can not make the light guide plate fracture during the drawing of patterns.
In the present invention, the mounting position of the seal member can be set as required. The sealing member may be fixed between the first transparent substrate and the second transparent substrate, for example, disposed therebetween along the edges of the first transparent substrate and the second transparent substrate, or disposed in the middle inner region of the first transparent substrate and the second transparent substrate, or the edges of the first transparent substrate and the second transparent substrate may be sealed with the sealing member to achieve sealing. When the sealing is performed by the sealing member, the glue solution can be injected as a glue injection port without performing sealing while leaving one side.
In some embodiments of the present invention, the sealing element is a sealing rubber strip, and the sealing rubber strip may be an elastic rubber-based sealing rubber strip, and may also be an acrylic adhesive tape or a foam adhesive tape.
In order to facilitate the fixing, in a further embodiment of the present invention, the sealing rubber strip is preferably an acrylic adhesive tape or a foam adhesive tape.
In a third aspect, the present invention provides a method for preparing the above light guide plate, including the following steps:
s1), providing the encapsulation jig, and placing N light guide plate main bodies on the first transparent substrate through a support piece, wherein N is a natural number not less than 1;
s2), coating a reflecting layer glue solution to immerse the light guide plate main body with the reflecting layer glue solution;
s3) covering a second transparent substrate, and enabling the second transparent substrate to be in contact with the reflecting layer glue solution;
s4) solidifying the reflecting layer glue solution, and forming a reflecting layer on the surface of the light guide plate main body;
s5) removing the encapsulation jig to obtain the light guide plate.
The preparation method provided by the invention can realize the integral coating of the scattering surface of the light guide plate main body, is efficient and quick, has seamless connection between the reflecting layers coated on the scattering surfaces of the light guide plate, has good coating performance and no light leakage problem, and can integrally improve the light transmittance of the light guide plate along the light transmission direction.
In step S1), when the supporting member is a double-sided tape, the light guide plate body may be adhered to the first transparent substrate by using the double-sided tape; when the supporting member is a boss integrated with the first transparent substrate, the light guide plate body may be directly placed in the corresponding groove of the boss.
In addition, in step S2), the step of immersing the light guide plate main body in the reflective layer glue solution means that the light guide plate main body is entirely immersed in the reflective layer glue solution, so as to realize the four-sided encapsulation of the light guide plate main body.
In some embodiments of the present invention, when the second transparent substrate is closed, the second transparent substrate is gradually lowered in an inclined rotation manner with one side of the second transparent substrate as an axis. When the second transparent substrate is covered, one side edge of the second transparent substrate is used as a rotating shaft, after the side edge is contacted with the first transparent substrate, the second transparent substrate is gradually placed in a rotating mode, and the second transparent substrate is placed in a rotating mode from the side edge to gradually increase the contact area with the reflecting layer glue solution until the second transparent substrate is completely covered. The covering mode can remove bubbles between the second transparent substrate and the reflective layer glue solution, so that the probability of bubbles in the prepared reflective layer can be effectively reduced.
The invention also discloses another preparation method of the light guide plate, which comprises the following steps:
s1) providing the encapsulation jig provided with the sealing element, and placing N light guide plate main bodies on the first transparent substrate through a support element, wherein N is a natural number not less than 1; then the second transparent substrate is covered, and the sealing strip is used for sealing to form an accommodating space for accommodating the light guide plate main body;
s2) injecting a reflective layer glue solution into the accommodating space from the glue injection port, so that the reflective layer glue solution is immersed in the light guide plate main body;
s3) solidifying the reflecting layer glue solution, and forming a reflecting layer on the surface of the light guide plate main body;
s4) removing the encapsulation jig to obtain the light guide plate.
The preparation method provided by the invention comprises the steps of firstly, preventing the light guide plate main body from being arranged on the first transparent substrate through the supporting piece by utilizing the encapsulation jig provided by the invention, then covering the second transparent substrate, sealing the first transparent substrate and the second transparent substrate, and injecting glue through the glue injection port on the sealing piece after sealing so as to enable the injected reflective layer glue solution to immerse the light guide plate main body; and then curing the reflective layer glue solution to form a reflective layer on the surface of the light guide plate main body, thereby obtaining the light guide plate.
The preparation method is simple, convenient to operate, labor-saving, time-saving, high in reliability, low in cost and free of complex machine equipment, so that the preparation method is high in practicability, easy to popularize and apply and high in practical value.
Wherein, in step S1), when the supporting member is a double-sided tape, the light guide plate body may be adhered to the first transparent substrate by using the double-sided tape; when the supporting member is a boss integrated with the first transparent substrate, the light guide plate body can be directly placed in the corresponding groove of the boss. When sealing, the first transparent substrate and the second transparent substrate can be covered and sealed by the sealing element, or the sealing element can be placed on the first transparent substrate and then covered and sealed by the second transparent substrate. In this manner, the base of the sealing member is an elastic sealing member, and sealing between the first transparent substrate and the second transparent substrate can be achieved by compressing the sealing member.
When injecting the reflecting layer glue solution, can make the rubber coating tool be in vertical state, the injecting glue mouth is last promptly, and during the injecting glue, the reflecting layer glue solution flows from top to bottom, and this mode of operation more is favorable to the discharge of bubble.
In a fourth aspect, the present invention provides an optical sensor comprising the above light guide plate.
The light guide plate has high light transmittance and small light loss, so that the light sensor obtained by utilizing the light guide plate has the advantage of high light sensitivity.
In a fifth aspect, the invention provides an electronic device comprising the above-mentioned light sensor.
The electronic equipment comprises the optical sensor, and a face recognition system obtained by using the optical sensor has high sensing sensitivity.
Example 1
As shown in fig. 1, the present embodiment is a light guide plate, including:
the light guide plate body 10, as shown in fig. 2, includes an incident surface 101, a transmission surface 102 disposed opposite to the incident surface 101, and a scattering surface 103 interposed between the incident surface 101 and the transmission surface 102, and
the reflecting layer 20 covers the surface of the scattering surface 103;
wherein, the light guide plate body 10 is glass, and the refractive index thereof is 1.8; the reflective layer 20 is made of UV glue, and the reflective layer is made of UV polymer and has a refractive index of 1.4.
In the light guide plate, the light guide plate body 10 is a regular rectangular structure and is divided into three directions of length, width and height, so as to facilitate processing and manufacturing. The length direction of the light guide plate body 10 is a light transmission direction, one wide and high surface of the light guide plate body 10 is an incident surface 101, the other wide and high surface is a transmission surface 102, the long and high surface of the light guide plate body is a scattering surface 103, the incident surface 101 and the transmission surface 102 are oppositely arranged, and the reflecting layer 20 covers the surface of the scattering surface 103.
Example 2
The encapsulation jig 30 of the present embodiment is a light guide plate, and the structure thereof is shown in fig. 3-5, and the encapsulation jig 30 includes:
two transparent substrates, a first transparent glass substrate 301 and a second transparent glass substrate 302, and
a set of UV debonding double-sided adhesive tapes 303, which are adhered to the first transparent glass substrate and the second transparent glass substrate, respectively, for supporting the light guide plate main body and separating the light guide plate main body from the two transparent substrates;
base 40: the position for fixing the first transparent glass substrate 301 comprises a square-clip-shaped frame body 401 and positioning blocks 402 arranged on the surface of the square-clip-shaped frame body 401, the middle of the square-clip-shaped frame body 401 is of a hollow structure, and the positioning blocks 402 are distributed at four corners of the surface of the square-clip-shaped frame body 401 in an L shape;
wherein, and two transparent substrate face support piece's one side all is equipped with antiseized coating film layer.
Example 3
The embodiment is a method for preparing a light guide plate, which comprises the following steps:
s1) providing the encapsulation jig 30 of embodiment 2, comprising two glass substrates and a UV debonding double-sided adhesive tape 303; the thickness of the adhesive tape corresponds to the thickness needing to be encapsulated;
arranging a plurality of light guide plate main bodies 10, namely strip-shaped glass sheets, at certain intervals, sticking the glass sheets with a UV debonding double-sided adhesive tape 303 according to the structure shown in FIG. 6, and sticking the glass sheets and the UV debonding double-sided adhesive tape 303 to a first transparent glass substrate 301;
s2) dropping a reflective layer glue solution 304, i.e., UV glue, along the gap between the glass sheets and covering the reflective layer glue solution on the glass sheets, as shown in fig. 6;
s3) placing the second transparent glass substrate 302 in an inclined manner with one side 3021 as a rotation axis, as shown in fig. 7, the second transparent glass substrate 302 rotates from the side 3021 in the direction of the arrow in the figure, and the contact area with the reflective layer glue 304 is gradually increased through the rotation and placing until the second transparent glass substrate is completely covered; the cover can not be quickly covered when the cover is slowly covered to the bottom so as to avoid generating bubbles;
s4) irradiating the upper surface and the lower surface of the glass sheet by using UV equipment to solidify the UV adhesive, forming a reflective layer on the surface of the glass sheet, and simultaneously removing the viscosity of the UV adhesive removing tape;
s5), opening the two glass substrates, tearing off the UV debonding double-sided adhesive tape 303, and obtaining a plurality of glass strip combinations encapsulated on four sides, as shown in fig. 8;
s6) combining the glass strips, and positioning, cutting and splitting the glass strips by using a visual positioning laser device to obtain the four-side encapsulated light guide plate.
The preparation method is simple, convenient to operate, labor-saving, time-saving, high in reliability, low in cost and free of complex machine equipment, so that the preparation method is high in practicability, easy to popularize and apply and high in practical value.
Example 4
The embodiment is an encapsulation jig of a light guide plate, the structure of which is shown in fig. 9, and the encapsulation jig includes:
(A) two transparent substrates, a first transparent glass substrate 301 and a second transparent glass substrate 302;
(B) a set of UV debonding double-sided adhesive tapes 303, which are adhered to the first transparent glass substrate 301 and the second transparent glass substrate 302, respectively, for supporting the light guide plate body 10 and separating the light guide plate body 10 from the two transparent substrates;
(C) a sealing member 305, which is an acrylic tape, disposed between the first transparent glass substrate 301 and the second transparent glass substrate 302;
the first transparent glass substrate 301 and the second transparent glass substrate 302 are both in a square structure, and when sealing is performed, the sealing member 305 seals three adjacent edges of the first transparent glass substrate 301 and the second transparent glass substrate 302, and one edge is left unsealed and used as a glue injection port; the acrylic adhesive tape and the two transparent glass substrates form an accommodating space, and the UV debonding double-sided adhesive tape is positioned in the accommodating space;
and anti-sticking coating layers are arranged on the surfaces, facing the UV debonding double-sided adhesive tape, of the two transparent glass substrates.
Example 5
The embodiment is a method for preparing a light guide plate, which comprises the following steps:
s1) providing the encapsulation jig of embodiment 4, which comprises two glass substrates and a UV debonding double-sided tape; the thickness of the adhesive tape corresponds to the thickness needing to be encapsulated;
arranging a plurality of light guide plate main bodies, namely strip-shaped glass sheets according to a certain gap, pasting the glass sheets on the UV debonding double-sided adhesive tape, and pasting the glass sheets and the UV debonding double-sided adhesive tape on the first transparent glass substrate;
s2) fixing acrylic adhesive tapes serving as sealing elements along three adjacent edges of the first transparent glass substrate, then covering the second transparent glass substrate, wherein the thickness of the acrylic adhesive tapes is larger than the distance between the first transparent glass substrate and the second transparent glass substrate after covering, and sealing is realized through compression and extrusion;
s3) vertically placing the encapsulation mold, injecting the reflective layer glue solution from one side of the unsealed acrylic adhesive tape serving as a glue injection port, enabling the reflective layer glue solution to flow from top to bottom along gaps among the glass sheets after being injected from the glue injection port, and finally enabling the reflective layer glue solution to immerse the glass sheets to finish glue injection;
s4) using UV equipment to cure the UV glue on the two surfaces of the two glass substrates through irradiation, forming a reflecting layer on the surface of the glass sheet, and simultaneously removing the viscosity of the UV debonding adhesive tape;
s5) opening the two glass substrates, tearing off the UV debonding double-sided adhesive tape, and obtaining a plurality of glass strip combinations encapsulated on four sides;
s6) combining the glass strips, and positioning, cutting and splitting the glass strips by using a visual positioning laser device to obtain the four-side encapsulated light guide plate.
Example 6
The present embodiment is a light guide plate, and its structure is shown in fig. 10, and the difference between the present embodiment and embodiment 1 is that the surface of the reflective layer 20 in the present embodiment is covered with a black light-shielding protective layer 21. The other structures are the same as those in embodiment 1.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (16)
1. A light guide plate, comprising:
a light guide plate body including an incident surface, a transmission surface disposed opposite to the incident surface, and a scattering surface interposed between the incident surface and the transmission surface, an
The reflecting layer covers the surface of the scattering surface;
wherein the refractive index of the light reflecting layer is lower than that of the light guide plate body,
the light guide plate also comprises a black shading protective layer formed on the surface of the reflecting layer;
the refractive index of the reflecting layer is lower than that of the light guide plate main body by more than 0.2;
the light guide plate main body is made of glass or transparent polymers;
the light transmittance of the light guide plate main body is more than or equal to 90 percent;
the raw material of the reflecting layer is UV glue;
the thickness of the reflecting layer is 0.1-0.2 mm;
the surface roughness of the reflecting layer is less than or equal to 50 nm;
the surface roughness of the light-shielding protective layer is 100-300 nm.
2. An over-molding jig for preparing the light guide plate of claim 1, comprising:
two transparent substrates including a first transparent substrate and a second transparent substrate, an
A supporter disposed between the two transparent substrates, for supporting the light guide plate body and separating the light guide plate body from the two transparent substrates;
and anti-sticking coating layers are arranged on one surfaces of the two transparent substrates facing the supporting piece.
3. The encapsulated jig of claim 2, wherein the support is a UV debonding double-sided tape or a heat debonding double-sided tape.
4. The encapsulated jig of claim 3, wherein the support is a UV-debonded double-sided tape.
5. The encapsulated tool of claim 2, wherein the surface roughness of the first transparent substrate and the second transparent substrate are both 5-20 nm.
6. The encapsulated tool of claim 2, wherein the release coating is an AS waterproof antifouling film.
7. The encapsulation jig of claim 2, wherein the encapsulation jig comprises a base for fixing the position of the first transparent substrate, the base comprises a frame body shaped like a Chinese character 'hui', and a positioning block arranged on the surface of the frame body shaped like a Chinese character 'hui'.
8. The encapsulation jig of claim 7, wherein the positioning blocks are distributed in an L shape at four corners of the surface of the square frame.
9. The encapsulation jig of any one of claims 2-8, comprising a sealing member, wherein the sealing member and the two transparent substrates form at least one accommodating space, the supporting member is located in the accommodating space, and a glue injection port is formed on one side of the supporting member.
10. The encapsulation tool of claim 9, wherein the seal is a bead of sealant.
11. The encapsulated jig of claim 10, wherein the sealing rubber strip is an acrylic adhesive tape or a foam adhesive tape.
12. A method for preparing a light guide plate according to claim 1, comprising the steps of:
s1) providing the encapsulated jig of any one of claims 2 to 8, placing N light guide plate bodies on the first transparent substrate through a support, wherein N is a natural number not less than 1;
s2), coating a reflecting layer glue solution to immerse the light guide plate main body with the reflecting layer glue solution;
s3) covering a second transparent substrate, and enabling the second transparent substrate to be in contact with the reflecting layer glue solution;
s4) solidifying the reflecting layer glue solution, and forming a reflecting layer on the surface of the light guide plate main body;
s5) removing the encapsulation jig to obtain the light guide plate.
13. The method according to claim 12, wherein the second transparent substrate is gradually lowered in an inclined manner with a side edge of the second transparent substrate as an axis when the second transparent substrate is closed.
14. A method for preparing a light guide plate according to claim 1, comprising the steps of:
s1) providing the encapsulated jig of any one of claims 9 to 11, placing N light guide plate bodies on the first transparent substrate through a support member, wherein N is a natural number not less than 1; then the second transparent substrate is covered, and the sealing strip is used for sealing to form an accommodating space for accommodating the light guide plate main body;
s2) injecting a reflective layer glue solution into the accommodating space from the glue injection port, so that the reflective layer glue solution is immersed in the light guide plate main body;
s3) solidifying the reflecting layer glue solution, and forming a reflecting layer on the surface of the light guide plate main body;
s4) removing the encapsulation jig to obtain the light guide plate.
15. A light sensor comprising the light guide plate according to claim 1.
16. An electronic device comprising the light sensor of claim 15.
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| CN201910014177.XA CN109725380B (en) | 2019-01-07 | 2019-01-07 | Light guide plate and preparation method thereof, rubber coating jig, optical sensor and electronic equipment |
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| EP1750150A1 (en) * | 2005-07-25 | 2007-02-07 | Research In Motion Limited | Shared light pipe for message indicator and light sensor of ambient light |
| CN204241718U (en) * | 2014-12-09 | 2015-04-01 | 黄文香 | A kind of leaded light component |
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| CN108227067A (en) * | 2017-11-13 | 2018-06-29 | 矽力杰半导体技术(杭州)有限公司 | A kind of optical texture and the electronic equipment with the optical texture |
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| CN1061441C (en) * | 1995-10-30 | 2001-01-31 | 李昌谷 | Optical plate and method for making thereof and purposes |
| US10838126B2 (en) * | 2016-09-19 | 2020-11-17 | Apple Inc. | Electronic devices with infrared blocking filters |
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| EP1750150A1 (en) * | 2005-07-25 | 2007-02-07 | Research In Motion Limited | Shared light pipe for message indicator and light sensor of ambient light |
| CN204241718U (en) * | 2014-12-09 | 2015-04-01 | 黄文香 | A kind of leaded light component |
| CN204387964U (en) * | 2014-12-23 | 2015-06-10 | 广州市地下铁道总公司 | A kind of seamless spliced light guide plate device |
| CN108227067A (en) * | 2017-11-13 | 2018-06-29 | 矽力杰半导体技术(杭州)有限公司 | A kind of optical texture and the electronic equipment with the optical texture |
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