Optical module and electronic equipment

Abstract

The embodiment of the invention provides an optical module and electronic equipment. The optical module comprises a substrate; the first chip is arranged in a first area on the surface of the substrate and comprises a light-emitting unit for emitting light; the second chip is arranged in a second area on the surface of the substrate and comprises a receiving unit for receiving reflected light of the light; the cover plate covers the first chip and the second chip; a first hole and a second hole are formed in the cover plate; the first hole is located at the light-emitting position of the light-emitting unit. The second hole is located at the light receiving position of the receiving unit; the ratio of the length of the first hole in the second direction to the width of the first hole in the first direction is a first length-width ratio, the ratio of the length of the second hole in the second direction to the width of the second hole in the first direction is a second length-width ratio, and the first length-width ratio is larger than or equal to the second length-width ratio; the first aspect ratio is greater than 1; the second direction is parallel to the surface of the substrate and intersects with the first direction.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of photoelectric sensing technology, and in particular to an optical module and an electronic device. Background Art

[0002] With the rise of smart homes, infrared remote control technology has become an important bridge connecting various smart home appliances. Integrating infrared remote control functions in electronic products is one of the current hot research directions. Generally, integration is achieved by setting up an independent infrared remote control module in electronic products, but this will increase the size of electronic products and is not conducive to their miniaturization.

[0003] Single-point sensors and light sensors in related technologies may also be equipped with an emitting component for emitting infrared light. However, in order to reduce light crosstalk and improve sensing accuracy, these sensor products are usually designed with the openings on the sensor package as small as possible. However, the smaller openings cannot meet the light emission requirements of the infrared remote control function, making it impossible to integrate the infrared remote control function into products such as single-point sensors and light sensors that already include emitting components. Summary of the invention

[0004] In view of this, the embodiments of the present application hope to provide an optical module and an electronic device that can integrate a remote control function.

[0005] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] The embodiment of the present application provides an optical module, comprising: a substrate;

[0007] A first chip is arranged in a first area on the surface of the substrate, and comprises a light emitting unit; the light emitting unit is used to emit light;

[0008] A second chip is arranged in a second area on the surface of the substrate, and comprises a receiving unit; the receiving unit is used to receive the reflected light of the light; wherein the first area and the second area are arranged in parallel along a first direction parallel to the surface of the substrate;

[0009] a cover plate, covering the first chip and the second chip;

[0010] The cover plate is provided with a first hole and a second hole; the first hole is located at the light emitting position of the light emitting unit; the second hole is located at the light receiving position of the receiving unit;

[0011] Among them, the ratio of the length of the first hole in the second direction to the width in the first direction is a first aspect ratio, the ratio of the length of the second hole in the second direction to the width in the first direction is a second aspect ratio, the first aspect ratio is greater than or equal to the second aspect ratio; the first aspect ratio is greater than 1; the second direction is parallel to the surface of the substrate and intersects with the first direction.

[0012] In some embodiments, the second aspect ratio is greater than or equal to 1, and the length of the first hole in the second direction is greater than the length of the second hole in the second direction.

[0013] In some embodiments, the cross-sectional shape of the first hole on the first plane is an ellipse, a polygon, or an irregular shape; wherein the irregular shape is formed by curves and / or straight lines;

[0014] The cross-sectional shape of the second hole on the first plane is elliptical, circular or polygonal;

[0015] Wherein, the first plane is parallel to the surface of the substrate.

[0016] In some embodiments, the cross-sectional shape of the first hole on the second plane is rectangular or trapezoidal;

[0017] The cross-sectional shape of the second hole on the second plane is a rectangle or a trapezoid;

[0018] Wherein, the second plane is perpendicular to the surface of the substrate.

[0019] In some embodiments, the first aperture comprises a plurality of emission apertures;

[0020] Along the second direction, the plurality of emission holes are distributed at intervals.

[0021] In some embodiments, the optical module further includes:

[0022] A movable plate connected to the cover plate, the movable plate being used to slide in a direction parallel to a surface of the cover plate to adjust a light emitting surface area of ​​the first hole;

[0023] When the movable plate is in a first position, the first hole is not blocked; when the movable plate is in a second position different from the first position, part or all of the first hole is blocked by the movable plate.

[0024] In some embodiments, the light comprises a first light and a second light;

[0025] The first light includes a remote control signal corresponding to a preset code;

[0026] The second light comprises a periodic signal that is continuous wave modulated or pulse modulated;

[0027] The receiving unit is used to receive the reflected second light.

[0028] In some embodiments, the second chip further includes a reference unit close to one side of the first chip;

[0029] The cover plate includes a protruding structure located between the reference unit and the receiving unit,

[0030] The protruding structure extends along the second direction and is used to block the propagation of the light between the light emitting unit and the receiving unit.

[0031] In some embodiments, the optical module further includes a filter unit;

[0032] The filter unit is located between the receiving unit and the second hole, and covers a side of the second hole close to the substrate;

[0033] The filter unit is used to filter out other light except the reflected light.

[0034] The embodiment of the present application also provides an electronic device, comprising a light-transmitting panel and the above-mentioned optical module;

[0035] The light-transmitting panel is located at a side of the optical module away from the base substrate, and is used to protect the optical module.

[0036] In the optical module of the embodiment of the present application, the aspect ratio of the first hole corresponding to the light-emitting unit is greater than 1, and is greater than or equal to the aspect ratio of the second hole corresponding to the receiving unit. Compared with the first hole with an aspect ratio of 1, the embodiment of the present application maintains the aperture of the first hole in the first direction, increases its aperture in the second direction, makes the aspect ratio of the first hole greater than 1, increases the light output angle and radiation flux of the first hole, and improves the radiation intensity of the emitted large-angle light, so that the first hole can meet the light output requirements of remote control (for example, infrared remote control). In addition, since the aperture of the first hole in the first direction remains unchanged, it will not cause optical crosstalk caused by the increase of the aperture in the first direction, and can meet the accuracy requirements of the light sensing function. The remote control function and the light sensing function are integrated in one module; and the three openings required to realize the remote control function and the light sensing function separately are reduced to two openings. The aesthetics of the optical module is improved, which is conducive to reducing the integration cost of the remote control module and the light sensing module, and accelerating the miniaturization development of terminal products. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The structure of the optical module in the embodiment of the present application is shown in FIG. Figure 1 ;

[0038] Figure 2 The structure of the cover plate of the optical module in the embodiment of the present application is shown in FIG. Figure 1 ;

[0039] Figure 3 The structure of the cover plate of the optical module in the embodiment of the present application is shown in FIG. Figure 2 ;

[0040] Figure 4 This is a schematic structural diagram of the cover plate of the optical module in the first comparative example of the present application;

[0041] Figure 5 This is a schematic structural diagram of the cover plate of the optical module in the second comparative example of the present application;

[0042] Figure 6 This is a simulation diagram of the light intensity distribution of the optical module in the embodiment of the present application;

[0043] Figure 7 The structure of the optical module in the embodiment of the present application is shown in FIG. Figure 3 ;

[0044] Figure 8 The structure of the cover plate of the optical module in the embodiment of the present application is shown in FIG. Figure 2 ;

[0045] Fig. 9 The structure of the cover plate of the optical module in the embodiment of the present application is shown in FIG. Figure 3 ;

[0046] Fig. 10A The structure of the cover plate and the movable plate of the optical module in the embodiment of the present application is shown in FIG. Figure 1 ;

[0047] Fig. 10B The structure of the cover plate and the movable plate of the optical module in the embodiment of the present application is shown in FIG. Figure 2 ;

[0048] Fig.11 The structure of the optical module in the embodiment of the present application is shown in FIG. Figure 4 ;

[0049] Fig.12 The structure of the optical module in the embodiment of the present application is shown in FIG. Figure 5 ;

[0050] Fig.13 Schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0051] The following will be combined with the embodiments of the present application and the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features known in the art are not described; that is, all features of the actual embodiments are not described here, and well-known functions and structures are not described in detail.

[0053] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0054] Wireless remote control technology is a communication technology that uses light (e.g., infrared light) as a medium for information transmission to perform wireless, contactless control. It allows users to control the device without direct contact with it, greatly improving the convenience of use. Integrating remote control functions into electronic devices has also become an urgent problem to be solved.

[0055] The original intention of the packaging design of products such as single-point sensors and light sensors is in essential conflict with the functional requirements of remote controls: the former pursues the precision and accuracy of light signals, while the latter pursues the diffusion and remote control capabilities of light signals. The angle and intensity of light emitted by single-point and light-sensitive products cannot meet the light emission requirements of remote control functions. Specifically, in order to better realize its sensing function and increase its measurement or detection accuracy, the transmitting hole and / or receiving hole in the single-point sensor and light sensor are usually made relatively small, thereby reducing the effects of optical crosstalk. The remote control function requires that the light signal emitted by its transmitter meets a certain angle and light intensity (radiation intensity) in order to achieve the function of effectively controlling the controlled target device at a long distance, which requires that the aperture of the transmitting hole on the transmitter cannot be too small.

[0056] Therefore, a modular design approach is usually adopted to integrate the remote control module into the target product as an independent module unit. However, configuring the light sensing module and the remote control module separately increases the size of the target product, which is not conducive to its miniaturization development.

[0057] In view of this, an embodiment of the present application provides an optical module, such as Figure 1As shown, the optical module 100 includes a base substrate 101;

[0058] The first chip 102 is disposed in a first area on the surface of the substrate 101 and includes a light emitting unit; the light emitting unit is used to emit light;

[0059] The second chip 103 is arranged in a second area on the surface of the base substrate 101, and includes a receiving unit; the receiving unit is used to receive the reflected light of the light; wherein the first area and the second area are arranged in parallel along a first direction parallel to the surface of the base substrate 101;

[0060] A cover plate 104, covering the first chip 102 and the second chip 103;

[0061] The cover plate 104 is provided with a first hole 105 and a second hole 106; the first hole 105 is located at the light emitting position of the light emitting unit; the second hole 106 is located at the light receiving position of the receiving unit;

[0062] Among them, the ratio of the length of the first hole 105 in the second direction to the width in the first direction is a first aspect ratio, the ratio of the length of the second hole 106 in the second direction to the width in the first direction is a second aspect ratio, the first aspect ratio is greater than or equal to the second aspect ratio; the first aspect ratio is greater than 1; the second direction is parallel to the surface of the substrate and intersects with the first direction.

[0063] In some embodiments, the first chip can generate non-visible light radiation by current driving. For example, the first chip is a vertical cavity surface emitting laser (Vertical-Cavity Surface-Emitting Laser, VCSEL) chip or an edge emitting laser (Edge-Emitting Laser, EEL) chip. The light-emitting unit of the VCSEL chip includes a laser diode, which emits light perpendicular to the chip surface. Compared with the EEL chip, the VCSEL chip is more conducive to realizing large-scale arrays and integration. The second chip can receive light signals and convert them into electrical signals for subsequent processing. For example, the second chip is an application-specific integrated circuit (Application-Specific Integrated Circuit, ASIC) chip. Light can be emitted by the light-emitting unit, which is derived from the first hole and reaches the object to be measured, and is received by the receiving unit through the second hole after being reflected by the object to be measured. The optical module senses the relevant information of the object to be measured through the received reflected light. Exemplarily, the optical module calculates the time of flight (Time of Flight, TOF) and obtains the distance of the object to be measured based on the emitted infrared light and the received reflected infrared light, and then the corresponding depth information can be generated.

[0064] On a plane parallel to the base substrate 101, the arrangement direction of the first area and the second area is the first direction, that is, the center line direction of the first hole 105 and the second hole 106 is the first direction. The line direction of the two points with the maximum connection distance on the edge of the first hole 105 is the second direction. The length of the first hole 105 in the second direction is the first length, the width of the first hole 105 in the first direction is the first width, and the ratio between the first length and the first width is the first aspect ratio. The length of the second hole 106 in the second direction is the second length, the width of the second hole 106 in the first direction is the second width, and the ratio between the second length and the second width is the second aspect ratio.

[0065] In a specific embodiment, the top view of the cover plate is as follows Figure 2 As shown, the length of the first hole in the second direction (Y-axis direction) is L1, and the ratio of the length of the first hole in the Y-axis direction to its width in the first direction (X-axis direction) is the first aspect ratio L1 / W1. Similarly, the ratio of the length of the second hole in the Y-axis direction to its width in the X-axis direction is the second aspect ratio L2 / W2. Among them, the first aspect ratio L1 / W1 is greater than 1, the second aspect ratio L2 / W2 is equal to 1, and the first aspect ratio L1 / W1 is greater than the second aspect ratio L2 / W2.

[0066] In another specific embodiment, the top view of the cover plate is as follows Figure 3As shown, the ratio of the length of the first hole in the Y-axis direction to its width in the first direction is the first aspect ratio L1 / W1. The ratio of the length of the second hole in the Y-axis direction to its width in the X-axis direction is the second aspect ratio L2 / W2. The first aspect ratio L1 / W1 is greater than 1, the second aspect ratio is greater than L2 / W2 is greater than 1, and the first aspect ratio L1 / W1 is equal to the second aspect ratio L2 / W2.

[0067] This application also provides a comparative example 1. Figure 4 As shown, the length of the first hole 105 in the Y-axis direction in the comparative embodiment 1 is the first length L1, and the length of the second hole 106 in the Y-axis direction is the second length L2. The first length L1 is greater than the second length L2, the first aspect ratio L1 / W1 is equal to 1, and the second aspect ratio L2 / W2 is equal to 1.

[0068] Compared with Comparative Example 1, Figure 2 and Figure 3 In the illustrated embodiment, the first aspect ratio L1 / W1 is greater than 1, and the aspect ratio of the first hole is greater than or equal to the aspect ratio of the second hole. It increases the aperture of the first hole in the second direction, increases the light-emitting area and radiation flux of the first hole, and improves the radiation intensity of the emitted large-angle infrared light, so that the first hole can meet the light-emitting requirements of the wireless remote control. In addition, since the aperture of the first hole in the first direction remains unchanged, optical crosstalk caused by the increase in the aperture in the first direction will not occur. The optical module in the embodiment of the present application can not only meet the light-emitting requirements of the wireless remote control to realize the wireless remote control function, but also meet the accuracy required by the light sensing function.

[0069] The present application also provides a comparative embodiment 2, which differs from the comparative embodiment 1 only in that the aperture of the first hole 105 in the X-axis direction and the Y-axis direction is increased. By increasing the aperture in the first direction and the second direction at the same time, the light output area and the radiation flux of the first hole 105 are increased, so that the light output requirements of the wireless remote control can be met. Figure 4 From the optical path analysis diagram of the optical module shown, it can be seen that compared with the first hole 105 shown by the solid line, the aperture of the first hole 105 shown by the dotted line in the first direction is increased, which will increase the emission angle of the light, and thus increase the probability of the light entering the receiving end after being reflected by the glass cover plate outside the optical module, so that it is superimposed with the target reflected light and aggravates the optical crosstalk problem, which in turn leads to the failure to meet the accuracy requirements of the light sensing function.

[0070] Since different air gaps (referring to the distance between the optical module and the light-transmitting panel disposed thereon) have different effects on the optical performance of the optical module, the present application compares the performance parameters of multiple embodiments under different air gap conditions, and finds that when the air gap is A, or when the air gap is B, the aperture of the first hole in the first direction of multiple embodiments remains unchanged, and the aperture in the second direction is increased in sequence. As the first aspect ratio increases, the aperture of the first hole in the second direction also gradually increases, and the radiation intensity of infrared light at a larger angle increases significantly, which can meet the radiation intensity requirements of infrared remote control. In addition, the increase in the aperture in the second direction has a small effect on the optical crosstalk in the receiving unit, which can even be ignored, and will not affect the optical module to realize the light sensing function. Not only does it realize the integration of remote control function and light sensing function in one module, but it also reduces the three openings required to realize the remote control function and light sensing function separately to two openings. The aesthetics of the optical module is improved, which is conducive to reducing the integration cost of the remote control module and the light sensing module, and accelerating the miniaturization development of terminal products.

[0071] In some embodiments, the second aspect ratio is greater than or equal to 1, and the length of the first hole in the second direction is greater than the length of the second hole in the second direction.

[0072] The second aspect ratio is greater than 1, and the aperture of the first hole in the second direction is greater than its aperture in the first direction. Alternatively, the second aspect ratio is equal to 1, and the aperture of the first hole in the second direction is equal to its aperture in the first direction. It should be noted that the embodiment of the present application does not limit the specific size of the second aspect ratio. However, if the second aspect ratio is less than 1, the amount of light entering the second hole in the first direction will increase compared to the amount of light entering in the second direction. Figure 5 The optical crosstalk paths shown are detrimental to the accuracy required for the light sensing function.

[0073] The length of the first hole in the second direction is greater than the length of the second hole in the second direction, and the width of the first hole in the first direction is greater than or equal to the width of the second hole in the first direction. Since the length of the second hole for receiving light in the second direction is less than the length of the first hole for emitting light in the same direction, while increasing the outgoing radiation flux, the amount of light entering the second hole in the same direction will not increase, and the accuracy of the light sensing function will not be affected.

[0074] In some embodiments, the cross-sectional shape of the first hole on the first plane is an ellipse, a polygon, or an irregular shape; wherein the irregular shape is formed by curves and / or straight lines;

[0075] The cross-sectional shape of the second hole on the first plane is circular or polygonal;

[0076] Wherein, the first plane is parallel to the surface of the substrate.

[0077] On a first plane parallel to the surface of the substrate, the cross-sectional shape of the first hole is an ellipse, a polygon or an irregular shape. Taking the ellipse as an example, continue to refer to Figure 2 , the direction of the short axis of the ellipse is the first direction, and the direction of the long axis is the second direction. The length of the short axis of the ellipse is W1, and the length of the long axis is L1.

[0078] Continue to refer Figure 4 In the comparative embodiment 1 shown, the cross-sectional shape of the first hole 105 is circular. The first hole 105 with an elliptical cross-sectional shape increases its aperture in the second direction, which can improve the light intensity index at a large angle. The aperture of the first hole 105 in the first direction remains unchanged, which does not increase the risk of optical crosstalk in the optical module. Figure 6 for Figure 2 and Figure 4 The corresponding two embodiments are the simulation diagrams of radiation intensity distribution at different angles. Figure 6 As shown in FIG. 1 , when the cross-sectional shape of the first hole 105 is an ellipse, it still has a certain radiation intensity near the positive and negative θ degrees, which can meet the radiation intensity requirement of the infrared remote control function. When the cross-sectional shape of the first hole 105 is a circle, when it is above the positive and negative δ degrees, its radiation intensity is almost 0, which cannot meet the infrared remote control function's requirement for infrared light radiation intensity.

[0079] It should be noted that the embodiment of the present application does not limit the specific cross-sectional shape of the first hole on the first plane, as long as it satisfies the first aspect ratio greater than 1, that is, the first hole satisfies the hole diameter in the first direction (the direction of the line connecting the centers of the two holes) being smaller than the hole diameter in the second direction (not the direction of the line connecting the centers of the two holes).

[0080] On a first plane parallel to the surface of the substrate, the cross-sectional shape of the second hole is an ellipse, a circle or a polygon. Figure 2 , the aperture of the second hole in the first direction is equal to its aperture in the second direction. On the one hand, the second hole with a circular cross-sectional shape can receive reflected light from all directions, which can effectively improve the reception efficiency of reflected light. On the other hand, the second hole with a circular cross-sectional shape is also conducive to its processing and manufacturing. It should be noted that the embodiment of the present application does not limit the specific cross-sectional shape of the second hole on the first plane.

[0081] In some embodiments, the cross-sectional shape of the first hole on the second plane is rectangular or trapezoidal;

[0082] The cross-sectional shape of the second hole on the second plane is a rectangle or a trapezoid;

[0083] Wherein, the second plane is perpendicular to the surface of the substrate.

[0084] In a specific embodiment, continue to refer to Figure 1 In a second plane perpendicular to the surface of the base substrate 101 , the cross-sectional shape of the first hole 105 and the second hole 106 is a rectangle.

[0085] In another specific embodiment, Figure 7 As shown, on the second plane perpendicular to the surface of the substrate 101, the cross-sectional shape of the first hole 105 and the second hole 106 is a trapezoid that is wide at the top and narrow at the bottom. The second hole 106 that is wide at the top and narrow at the bottom can more effectively guide the reflected infrared light to the receiving unit, further improving the receiving efficiency of the receiving unit.

[0086] In some embodiments, the first aperture comprises a plurality of emission apertures;

[0087] Along the second direction, the plurality of emission holes are distributed at intervals.

[0088] Wherein, in the case where the first hole includes a plurality of emitting holes, the first length refers to the distance between the two farthest points of the plurality of emitting holes in the second direction. The first width refers to the distance between the two farthest points of the plurality of emitting holes or one emitting hole in the first direction. The first aspect ratio is the ratio between the first length and the first width. For example, Figure 8 As shown, the first hole 105 includes a plurality of emission holes spaced apart along the Y axis direction, wherein the first length L1 of the first hole 105 is the distance between the upper vertex and the lower vertex, the first width W1 is the distance between the left vertex and the right vertex, and the first aspect ratio is L1 / W1.

[0089] Continue to refer Figure 8 , the cross-sectional shape of each emitting hole on the first plane can be set to a circle with the same diameter. The cross-sectional shape of the second hole 106 on the first plane is also set to a circle. On the one hand, the circular emitting hole can reduce the risk of distortion of the emitted light spot. On the other hand, the circular cross-sectional shape makes the emitting hole and the second hole have better matching, which can further ensure the accurate transmission of infrared light. It should be noted that the present application does not limit the cross-sectional shape of each emitting hole on the first plane.

[0090] In addition, the embodiment of the present application does not limit the specific aperture of each transmitting hole. Fig. 9As shown, the first hole 105 includes three emission holes distributed at intervals. Among them, the emission hole in the middle has the largest diameter, and the emission hole close to the edge of the cover plate has a relatively smaller diameter. At this time, the width of the first hole 105 in the first direction refers to the maximum diameter of the emission hole. It should be noted that the embodiment of the present application does not limit the specific number of the emission holes 105 in the first direction, that is, multiple emission holes can be set in the first direction.

[0091] In some embodiments, Fig. 10A or Fig. 10B As shown, the optical module also includes:

[0092] A movable plate 1001 connected to the cover plate 104 , the movable plate 1001 being used to slide in a direction parallel to the surface of the cover plate 104 to adjust the light emitting surface area of ​​the first hole 105;

[0093] When the movable plate 1001 is in a first position, the first hole 105 is not blocked; when the movable plate 1001 is in a second position different from the first position, part or all of the first hole 105 is blocked by the movable plate 1001 .

[0094] In some embodiments, continue to refer to Fig. 10A , the first hole 105 is a single-hole structure. The cover plate 104 is provided with a movable plate 1001 slidably connected thereto, and a circular hole 1002 is provided on the movable plate 1001, and the diameter of the circular hole 1002 is equal to the width W1 of the first hole 105 in the first direction. During the period when the optical module realizes the remote control function, the movable plate 1001 and the first hole 105 do not overlap. During the period when the optical module realizes the light sensing function, the movable plate 1001 overlaps with the first hole 105, shielding part of the first hole 105 and reducing the light output area of ​​the first hole 105. Specifically, in the direction perpendicular to the surface of the substrate, the center of the circular hole 1002 on the movable plate overlaps with the center of the first hole 105. Part of the first hole 105 near the edge of the cover plate is covered by the movable plate 1001, and the infrared light emitted by the light-emitting unit is guided out through the first hole 105 and the circular hole on the movable plate 1001 and then emitted.

[0095] In some other embodiments, continue to refer to Fig. 10B The first hole 105 includes three emission holes. When the optical module realizes the remote control function, the movable plate 1001 does not overlap with the multiple emission holes. When the optical module realizes the light sensing function, the movable plate 1001 overlaps with the first hole 105 and covers the emission holes on both sides. The infrared light emitted by the light-emitting unit is guided out through the central emission hole and the circular hole 1002 on the movable plate.

[0096] It should be noted that, during the period when the optical module realizes the remote control function, the movable plate may also overlap with part of the first hole, but the light emitting area of ​​the optical module during the period when the infrared remote control function is realized should be larger than the light emitting area during the period when the light sensing function is realized. In addition, the one or more circular holes provided on the movable plate are only used as examples. The embodiments of the present application do not limit the specific shapes of the holes on the movable plate.

[0097] In some embodiments, the light comprises a first light and a second light;

[0098] The first light includes a remote control signal corresponding to a preset code;

[0099] The second light comprises a periodic signal that is continuous wave modulated or pulse modulated;

[0100] The receiving unit is used to receive the reflected second light.

[0101] The optical module realizes the remote control function through the first light emitted by the light-emitting unit. The first light includes a remote control signal corresponding to a preset code. Among them, the specific modulation method of the first light can be pulse width modulation (PWM) or pulse position modulation (PPM). When the light-emitting unit emits the first light, that is, when the remote control signal corresponding to the preset code is emitted, the first light (remote control signal) will be transmitted to the location of the controlled device. A corresponding remote control receiver is provided in the controlled target device. When the remote control receiver receives the first light, it can convert it into a corresponding electrical signal, and identify the specific operation instruction through the internal decoding circuit, and then control the controlled device to perform the corresponding operation. The controlled device can be a household appliance operated by remote control, such as a television, projector, stereo, air conditioner, fan, refrigerator, lamp, switch, etc.

[0102] The optical module emits a second light through the light-emitting unit, and receives the reflected second light through the receiving unit to realize the light sensing function. Exemplarily, the TOF function can be realized by the optical module. In some embodiments, the light-emitting unit emits a second light, wherein the second light includes a periodic signal modulated into a certain frequency. And by measuring the phase difference between the second light and the light when it reaches the object to be measured and is reflected back to the receiving unit, the flight time can be indirectly calculated and the depth of the object to be measured can be obtained. In other embodiments, a light pulse is emitted to the object to be measured, and by measuring the time interval between the reflected and emitted light pulses, the flight time and the depth of the object to be measured can be directly calculated.

[0103] In some embodiments, the receiving unit of the second chip includes a single photon avalanche diode (SPAD) or an avalanche photon diode (APD). Among them, SPAD has single photon detection capability. When a photon is absorbed by the SPAD, a photogenerated carrier is generated. Under the action of reverse bias, the carrier is accelerated and obtains enough energy, and then collides with the atoms in the lattice to produce more electron-hole pairs. These new electron-hole pairs will continue to cause collision ionization, forming an avalanche multiplication effect, so that the photocurrent increases rapidly to a detectable level. APD also amplifies the signal by utilizing the avalanche multiplication effect of carriers, thereby improving the sensitivity of detection.

[0104] In some embodiments, Fig.11 The second chip 103 further includes a reference unit 1101 close to one side of the first chip 102;

[0105] The cover plate 104 includes a protruding structure 1103 located between the reference unit 1101 and the receiving unit 1102.

[0106] The protruding structure extends along the second direction and is used to block the propagation of the light between the light emitting unit and the receiving unit.

[0107] The reference unit 1101 can directly receive the infrared light emitted by the light emitting unit. The optical module can calibrate the calculated flight time according to the time when the reference unit 1101 receives the infrared light, and obtain the distance of the object to be measured, thereby increasing the accuracy of the calculation. In some embodiments, similar to the receiving unit, the reference unit can also include a SPAD or an APD.

[0108] The lower surface of the protruding structure 1103 abuts against the upper surface of the second chip 103, which can block the propagation of infrared light between the light-emitting unit on the first chip and the receiving unit 1102 on the second chip. Of course, it can also block the propagation of infrared light between the reference unit 1101 and the receiving unit 1102 on the second chip.

[0109] It should be noted that, in some embodiments, the reference unit may not be provided on the second chip. In this case, the protruding structure on the cover plate may be provided between the first chip and the second chip to block the light propagation between the light emitting unit and the receiving unit.

[0110] In some embodiments, Fig.12 As shown, the optical module further includes a filter unit 1201;

[0111] The filter unit 1201 is located between the receiving unit 1102 and the second hole 106, and covers a side of the second hole 106 close to the base substrate;

[0112] The filter unit 1201 is used to filter out other light except the reflected light.

[0113] The light filter 1201 only allows the target light (the light emitted by the emitting unit) of the corresponding wavelength to pass through, and inhibits the passage of other light. Fig.12 As shown, the first filter unit 1201 located below the second hole 106 can filter out visible light such as ambient light, reduce interference from other light except the target light, and improve the measurement accuracy. In some other embodiments, the first filter unit 1201 can also be arranged on the upper surface of the second chip. In some embodiments, continue to refer to Fig.12 , a second filter unit 1202 may be provided below the first hole 105, and the second filter unit covers the lower surface of the first hole 105, and is used to filter out other light except the target, and further reduce the interference caused by the ambient light. In some other embodiments, the second filter unit 1202 may also be provided on the upper surface of the first chip. Based on the same inventive concept, the embodiment of the present application also provides an electronic device, such as Fig.13 As shown, the electronic device 200 includes a light-transmitting panel 201 and the optical module 100 in any of the above embodiments;

[0114] The light-transmitting panel 201 is located at a side of the optical module 100 away from the base substrate, and is used to protect the optical module 100 .

[0115] In the direction perpendicular to the surface of the substrate, the distance D1 between the light-transmitting panel 201 and the optical module 100 is an air gap. An appropriate air gap helps to ensure optical performance and avoid unnecessary optical interference. Since the electronic device includes the above optical module, the electronic device also has similar beneficial effects as the above optical module. Therefore, the beneficial effects of the electronic device will not be repeated here.

[0116] In some embodiments, continue to refer to Fig.13 The electronic device 200 includes a foam 202 disposed between the light-transmitting panel 201 and the optical module 100. The foam 202 has good shock absorption and pressure reduction performance and can protect the optical module together with the transparent panel. On the other hand, the foam can ensure that a suitable air gap is maintained between the optical module and the light-transmitting panel.

[0117] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0118] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical module, characterized in that: include: substrate substrate; A first chip is arranged in a first area on the surface of the substrate, and comprises a light emitting unit; the light emitting unit is used to emit light; A second chip is arranged in a second area on the surface of the substrate, and comprises a receiving unit; the receiving unit is used to receive the reflected light of the light; wherein the first area and the second area are arranged in parallel along a first direction parallel to the surface of the substrate; a cover plate, covering the first chip and the second chip; The cover plate is provided with a first hole and a second hole; the first hole is located at the light emitting position of the light emitting unit; the second hole is located at the light receiving position of the receiving unit; Among them, the ratio of the length of the first hole in the second direction to the width in the first direction is a first aspect ratio, the ratio of the length of the second hole in the second direction to the width in the first direction is a second aspect ratio, the first aspect ratio is greater than or equal to the second aspect ratio; the first aspect ratio is greater than 1; the second direction is parallel to the surface of the substrate and intersects with the first direction.

2. The optical module according to claim 1, characterized in that: The second aspect ratio is greater than or equal to 1, and a length of the first hole in the second direction is greater than a length of the second hole in the second direction.

3. The optical module according to claim 1, characterized in that: The cross-sectional shape of the first hole on the first plane is an ellipse, a polygon, or an irregular shape; wherein the irregular shape is formed by surrounding curves and / or straight lines; The cross-sectional shape of the second hole on the first plane is elliptical, circular or polygonal; Wherein, the first plane is parallel to the surface of the substrate.

4. The optical module according to claim 1, characterized in that: The cross-sectional shape of the first hole on the second plane is a rectangle or a trapezoid; The cross-sectional shape of the second hole on the second plane is a rectangle or a trapezoid; Wherein, the second plane is perpendicular to the surface of the substrate.

5. The optical module according to claim 1, characterized in that: The first aperture comprises a plurality of emission apertures; Along the second direction, the plurality of emission holes are distributed at intervals.

6. The optical module according to claim 1, characterized in that: Also includes: A movable plate connected to the cover plate, the movable plate being used to slide in a direction parallel to a surface of the cover plate to adjust a light emitting surface area of ​​the first hole; When the movable plate is in a first position, the first hole is not blocked; when the movable plate is in a second position different from the first position, part or all of the first hole is blocked by the movable plate.

7. The optical module according to any one of claims 1 to 6, characterized in that: The light comprises a first light and a second light; The first light includes a remote control signal corresponding to a preset code; The second light comprises a periodic signal that is continuous wave modulated or pulse modulated; The receiving unit is used to receive the reflected second light.

8. The optical module according to any one of claims 1 to 6, characterized in that: The second chip further includes a reference unit close to one side of the first chip; The cover plate includes a protruding structure located between the reference unit and the receiving unit, The protruding structure extends along the second direction and is used to block the propagation of the light between the light emitting unit and the receiving unit.

9. The optical module according to any one of claims 1 to 6, characterized in that: Also includes a filter unit; The filter unit is located between the receiving unit and the second hole, and covers a side of the second hole close to the substrate; The filter unit is used to filter out other light except the reflected light.

10. An electronic device, characterized in that: It comprises a light-transmitting panel and the optical module according to any one of claims 1 to 9; the light-transmitting panel is located on a side of the optical module away from the base substrate, and is used to protect the optical module.

Images