CN110166592B

CN110166592B - Electronic device

Info

Publication number: CN110166592B
Application number: CN201910410805.6A
Authority: CN
Inventors: 张洲川
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2021-02-26
Anticipated expiration: 2039-05-16
Also published as: CN110166592A

Abstract

The application provides an electronic equipment, electronic equipment includes optical sensor and display screen apron, optical sensor is connected and corresponds with the circuit board the display screen apron sets up, optical sensor with be equipped with the light guide plate between the display screen apron, the light guide plate is used for reducing optical sensor with air gap between the display screen apron, optical sensor sees through the air gap the light guide plate and the display screen apron carries out light signal collection. The electronic equipment that provides in the embodiment of this application, through set up a light guide plate structure between display screen apron and optical sensor, be equivalent to less optical sensor and the display screen air gap between the apron, reduced the decay of light path at air gap, and then promoted optical sensor's optical property.

Description

Electronic device

Technical Field

The invention relates to the technical field of stacking of internal devices of electronic equipment, in particular to electronic equipment.

Background

Proximity sensors, ambient light sensors, etc. are optical devices commonly used in electronic devices, and the design of the optical path of the optical device is critical. In the conventional technology, optical devices such as a proximity sensor and an ambient light sensor are generally disposed under a TP cover plate of an electronic device, and an optical path of the optical devices needs to pass through: the gap between the optics and the TP cover plate (this segment is typically an air gap) -the thickness of the TP cover plate-and finally to the environment outside the electronic device, wherein the further the surface of the sensor is from the TP cover plate (i.e. the air gap as described above), the longer the optical attenuation path, and the worse the performance of the optics, such as proximity sensors and optical sensors. Therefore, how to shorten the distance between the optical device and the TP cover plate becomes the key of the optical path design of the optical device.

Disclosure of Invention

The embodiment of the application provides an electronic equipment, electronic equipment includes optical sensor and display screen apron, optical sensor is connected and corresponds with the circuit board the display screen apron sets up, optical sensor with be equipped with the light guide plate between the display screen apron, the light guide plate is used for reducing optical sensor with air gap between the display screen apron, optical sensor sees through air gap the light guide plate and the display screen apron carries out optical signal collection.

The electronic equipment that provides in the embodiment of this application, through set up a light guide plate structure between display screen apron and optical sensor, be equivalent to less optical sensor and the display screen air gap between the apron, reduced the decay of light path at air gap, and then promoted optical sensor's optical property.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a stack structure between an optical device and a TP cover plate;

FIG. 2 is a schematic view of a partial configuration of an electronic device with an elevated optical device;

FIG. 3 is a schematic diagram of a partial structure of an embodiment of an electronic device of the present application;

FIG. 4 is a schematic diagram of an embodiment of an optical sensor;

FIG. 5 is a schematic structural diagram of another embodiment of an optical sensor;

FIG. 6 is a schematic structural diagram of an embodiment of a display panel cover plate and a light guide plate;

FIG. 7 is a schematic view of another embodiment of a combination of a cover plate and a light guide plate;

FIG. 8 is a schematic diagram of an optical path structure of an optical sensor of an electronic device in an embodiment of the present application;

FIG. 9 is a schematic diagram of an optical path structure in which an intersection point of a maximum transmission angle range of a transmitter and a maximum reception angle range of a receiver of an optical sensor is located at the bottom of a light guide plate;

fig. 10 is a schematic diagram of an optical path structure in which an intersection point of a maximum transmission angle range of a transmitter and a maximum reception angle range of a receiver of an optical sensor is located outside a display screen cover plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be noted that the following examples are only illustrative of the present invention, and do not limit the scope of the present invention. Likewise, the following examples are only some but not all examples of the present invention, and all other examples obtained by those skilled in the art without any inventive step are within the scope of the present invention.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As used herein, an "electronic device" (or simply "terminal") includes, but is not limited to, an apparatus that is configured to receive/transmit communication signals via a wireline connection, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection, and/or another data connection/network, and/or via a wireless interface (e.g., for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and/or another communication terminal). A communication terminal arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; a Personal Communications System (PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A cellular phone is an electronic device equipped with a cellular communication module.

The solution of the present application is to solve the problem that the air gap (air gap) between the optical device and the TP (touch panel) cover is too large (i.e. the case where the optical device (including the proximity sensor and the light sensor) is located under the TP cover). Referring to fig. 1, fig. 1 is a schematic diagram of a stacked structure between an optical device and a TP cover, in which 11 is a circuit board, 12 is a sensor, 13 is a TP cover, 14 is a display screen, and 15 is an air gap (air gap).

In view of the problem that the air gap (air gap) between the optical device and the tp (touch panel) cover plate is too large, it is common in the conventional art to raise the optical device by locally thickening the FPC or by using an elevating plate. Fig. 2 is a partial structural schematic diagram of an electronic device with an elevated optical device, as shown in fig. 2. In the figure, 11 denotes a circuit board to which a step-up board is attached, 12 denotes a sensor, 13 denotes a TP cover, 14 denotes a display screen, and 15 denotes an air gap (air gap).

However, as the demands of users of electronic devices (especially mobile phones) on appearances are continuously increased, the water drop area and the bang area are smaller and smaller, even the existing models cancel the water drop area and the bang area, and only the proximity sensor and the light sensor can be placed below the black edge. Due to the interference of the structure (the space under the black edge is limited, and the width of the black edge is generally smaller than that of the sensor), the sensor cannot be lifted to a smaller air gap in many cases.

From the above analysis, because the sensor itself has a certain size, the air gap is inevitably made larger under the structural limitation, which results in that the distance from the sensor to the TP cover plate (i.e. the air gap mentioned above) is longer, the longer the optical attenuation path is, and the optical performance of the optical devices such as the proximity sensor and the optical sensor is poorer.

Since the distance from the sensor to the TP-panel is small due to the relatively large light attenuation of the air, it is considered that the TP-panel is extended since the devices (including proximity sensor and optical sensor) cannot be lifted, which is the main idea of the present invention.

Referring to fig. 3, fig. 3 is a schematic partial structure diagram of an embodiment of an electronic device according to the present application; it should be noted that the electronic device in the present application may include an electronic device with an optical sensor assembly, such as a mobile phone, a tablet computer, a notebook computer, and a wearable device. The electronic device 100 in this embodiment includes, but is not limited to: optical sensor 110, display cover plate 120, and circuit board 130. Of course, the electronic device 100 may also include other structures, and the present embodiment only shows the components related to the present application for illustration, and other structures are within the understanding range of those skilled in the art and will not be described herein again. It should be noted that the terms "including" and "having" and any variations thereof in this embodiment are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or may alternatively include other steps or elements inherent to such process, method, article, or apparatus.

Specifically, the optical sensor 110 is connected to the circuit board 130 and is disposed corresponding to the display cover 120, in other words, the display cover 120 is disposed in the signal collecting direction of the optical sensor 110. A light guide plate 140 is disposed between the optical sensor 110 and the display screen cover plate 120, the light guide plate 140 is used for reducing an air gap 101 between the optical sensor 110 and the display screen cover plate 120, and the optical sensor 110 collects optical signals through the air gap 101, the light guide plate 140 and the display screen cover plate 120. Namely, the optical signal receiving path of the optical sensor 110 is: display cover 120, light guide plate 140, air gap 101. The label 150 may be represented as a display screen, i.e., the optical sensor 110 is disposed adjacent to the display screen 150, or disposed near an edge of the display screen 150. It should be noted that the terms "first", "second" and "third" in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Alternatively, the optical sensor 110 in the embodiment of the present application may be a proximity sensor including the transmitter 111 and the receiver 112 of an integral package structure. Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of an optical sensor, in which reference numeral 114 denotes a package housing. The optical signal transmission path of the optical sensor 110 is: air gap 101, light guide plate 140, display cover plate 120. Additionally, in some other embodiments, the optical sensor 110 may also include a light sensor and a proximity sensor in a unitary package structure. Referring to fig. 5, fig. 5 is a schematic structural diagram of another embodiment of an optical sensor, in which an optical sensor 110 in the embodiment includes a light sensor and a proximity sensor in an integrated package structure, where reference numeral 115 in the drawing denotes a housing, 111 denotes an emitter of the proximity sensor, and may specifically be an infrared LED lamp; denoted 112 as the receiver of the proximity sensor and 113 as the receiver of the light sensor.

The refractive index of the material of the light guide plate 140 is selected to be the same as or similar to the refractive index of the material of the display cover plate 120. This reduces the reflection of light between the light guide plate 140 and the display cover 120, and increases the transmittance of light. Specifically, the material of the light guide plate 140 may be glass, plastic, or transparent resin; similarly, the material of the display panel cover 120 may also be glass, plastic or transparent resin, and may also be a structure of various materials and optical functional coatings.

Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment in which a display panel cover plate and a light guide plate are integrated, in which the light guide plate 140 and the display panel cover plate 120 are integrated into a whole, that is, the light guide plate 140 is a protrusion structure on the side of the display panel cover plate 120, and the light guide plate 140 and the display panel cover plate 120 may be made of glass or an integrally molded resin material. In addition, the light guide plate 140 and the display panel cover plate 120 may be made of different materials and may be integrally molded by two-color injection molding. The advantage of this kind of structure lies in there is not the gap between light guide plate 140 and the display screen apron 120, and structure as an organic whole can reduce the loss of light between light guide plate 140 and display screen apron 120, improves the transmissivity of light.

Referring to fig. 7, fig. 7 is a schematic structural view of another embodiment of a combination of a display panel cover plate and a light guide plate, wherein the light guide plate 140 and the display panel cover plate 120 in the embodiment are connected by adhesion. The light guide plate 140 and the display panel cover plate 120 may be made of glass, and the light guide plate 140 and the display panel cover plate 120 are bonded by an optical Adhesive layer 124 (OCA), because the optical Adhesive is colorless and transparent, has a light transmittance of more than 90%, has good Adhesive strength, can be cured at room temperature or at intermediate temperature, and has the characteristics of small curing shrinkage and the like.

When the light guide plate 140 and the display panel cover 120 are made of glass (or made of the same material), the optical adhesive needs to be selected to have a refractive index close to that of the light guide plate 140 and the display panel cover 120, for example, the refractive index of glass is 1.5, and the refractive index of the optical adhesive is also selected to be about 1.5 (for example, between 1.4 and 1.6). When the light guide plate 140 and the display panel cover 120 are made of different materials, the refractive index of the optical cement should be between the refractive indexes of the two, for example, the material of the display panel cover 120 is glass, and we assume that the refractive index of the glass is 1.5, and the material of the light guide plate 140 is resin, for example, the refractive index of the resin is 1.6, and the refractive index of the optical cement should be selected within a range of 1.5-1.6.

The combined structure of the display screen cover plate 120 and the light guide plate 140 has the advantages that each structural member is easy to process, special processing treatment is not needed, the display screen cover plate 120 is an ordinary cover plate, the light guide plate 140 only needs to be bonded at a needed position through optical cement, and the cost is relatively low.

With continued reference to fig. 3, it can be seen from the above analysis that, as the distance from the surface of the optical sensor 110 to the display panel cover 120 (i.e. air gap 101 as mentioned above) is longer, the optical sensor 110 has poorer performance, and therefore, the air gap 101 between the optical sensor 110 and the display panel cover 120 should be as smaller as possible, and even better if no air gap 101 exists. However, in the actual assembly process, the actual assembly problem needs to be considered, the light guide plate 140 cannot be too close to the optical sensor 110, because of tolerance problems, and if the light guide plate 140 is too close to the optical sensor 110, the optical sensor 110 and the light guide plate 140 may interfere with each other during the assembly process, thereby damaging the optical sensor 110. Therefore, the light guide plate 140 and the optical sensor 110 should be disposed in an assembly gap, which is actually the final air gap 101.

The electronic equipment provided in this embodiment sets up a light guide plate structure through setting up between display screen apron and optical sensor, has reduced the decay of light path at the air gap in other words between less optical sensor and the display screen apron, and then has promoted optical sensor's optical property.

Further, in order to improve the detection accuracy of the optical sensor, the intersection point of the maximum emission angle range of the emitter 111 and the maximum receiving angle range of the receiver 112 of the optical sensor 110 (taking a proximity sensor as an example) in the embodiment of the present application is between the surface of the light guide plate 140 on the side close to the optical sensor 110 (i.e., the inner surface 141 of the light guide plate 140) and the surface of the display cover plate 120 on the side far from the optical sensor 110 (i.e., the outer surface 121 of the display cover plate 120). Referring to fig. 8, fig. 8 is a schematic diagram of an optical path structure of an optical sensor of an electronic device in an embodiment of the present application, where lines with arrows indicate a range of a maximum transmission angle range of the transmitter 111 and a maximum reception angle range of the receiver 112; where the notation P is indicated as the intersection of the maximum transmission angle range of the transmitter 111 and the maximum reception angle range of the receiver 112.

This design is to improve the detection accuracy of the proximity sensor. If the intersection point P of the maximum emitting angle range of the emitter 111 and the maximum receiving angle range of the receiver 112 is located inside the light guide plate 140, please refer to fig. 9, fig. 9 is a schematic diagram of an optical path structure in which the intersection point P of the maximum emitting angle range of the emitter and the maximum receiving angle range of the receiver of the optical sensor is located at the bottom of the light guide plate 140, and if the intersection point P of the maximum emitting angle range of the emitter 111 and the maximum receiving angle range of the receiver 112 is located at the bottom of the light guide plate 140, the receiver 112 receives a large amount of light (dashed line in the figure) emitted by the emitter 111 reflected from the inner surface 141 of the light guide plate 140, so that the bottom noise is too large, and the detection accuracy of the proximity.

In another case, the intersection point P between the maximum transmission angle range of the transmitter 111 and the maximum reception angle range of the receiver 112 is located outside the display panel cover 120, referring to fig. 10, fig. 10 is a schematic diagram of an optical path structure in which the intersection point P between the maximum transmission angle range of the transmitter and the maximum reception angle range of the receiver of the optical sensor is located outside the display panel cover 120, that is, if the intersection point P between the maximum transmission angle range of the transmitter 111 and the maximum reception angle range of the receiver 112 is located above the outer surface 121 of the display panel cover 120, a blind area 1210 is formed on the outer surface 121 of the display panel cover 120, and even if there is an object block in the blind area 1210 (or there is a small blocking object in the blind area 1210), the receiver 112 cannot receive the optical signal transmitted by the transmitter 111 (because the blind area is not within the reception range of the receiver 112, also this area is not within the coverage of the emitter 111), which is the case in common terms of black hair (black hair close to not extinguishing the screen), in other words the problem that small objects in the blind area 1210 cannot be detected. This is also not a desirable result. It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

Further, with reference to fig. 8, a distance D between an intersection point P of a maximum emitting angle range of the emitter 111 and a maximum receiving angle range of the receiver 112 of the optical sensor 110 and a central plane 102 between a side surface 141 of the light guide plate 140 close to the optical sensor 110 and a side surface 121 of the display cover 120 far from the optical sensor 110 is less than or equal to 5 mm. Further alternatively, the intersection point P may lie in the central plane 102.

In the electronic device in this embodiment, by designing the position of the intersection point of the maximum transmission angle range of the transmitter and the maximum reception angle range of the receiver of the optical sensor, the occurrence of the black hair problem and the occurrence of the excessive bottom noise can be avoided, and the detection accuracy of the optical sensor (proximity sensor) is improved.

The above description is only a part of the embodiments of the present invention, and not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes performed by the present invention through the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An electronic device is characterized by comprising an optical sensor and a display screen cover plate, wherein the optical sensor is connected with a circuit board and arranged corresponding to the display screen cover plate; the optical sensor is a proximity sensor and comprises a transmitter and a receiver which are integrally packaged, and the intersection point of the maximum transmitting angle range of the transmitter and the maximum receiving angle range of the receiver of the optical sensor is between the surface of the light guide plate on the side close to the optical sensor and the surface of the display screen cover plate on the side far away from the optical sensor; the refractive index of the material of the light guide plate is the same as or similar to that of the material of the display screen cover plate.

2. The electronic device of claim 1, wherein the light guide plate and the display cover plate are made of glass.

3. The electronic device of claim 2, wherein the light guide plate is adhesively attached to the display cover plate.

4. The electronic device of claim 2, wherein the light guide plate is of unitary construction with the display cover plate.

5. The electronic device according to claim 1, wherein a distance between an intersection point of a maximum transmission angle range of the transmitter and a maximum reception angle range of the receiver of the optical sensor and a center plane between a side surface of the light guide plate close to the optical sensor and a side surface of the display screen cover plate away from the optical sensor is less than or equal to 5 mm.

6. The electronic device of claim 1, wherein the optical sensor comprises a light sensor and a proximity sensor in a unitary package structure.

7. The electronic device of claim 1, wherein a mounting gap is provided between the light guide plate and the optical sensor.