TWI589906B - Portable electronic device and proximity optical sensor module thereof - Google Patents

Description

Portable electronic device and its close-range optical sensing module

The present invention relates to an electronic device and a sensing module thereof, and more particularly to a portable electronic device and a short-range optical sensing module thereof.

In recent years, Proximity Sensors (PS) and Ambient Light Sensors (ALS) have been widely used in mobile phones, televisions or portable mobile devices for inductive use. Presence, or automatically adjust the brightness of the screen in response to ambient light intensity. For example, when a proximity sensor is applied to a handheld communication device, it can be used to detect the distance between the user's face and the display screen. That is to say, the proximity sensor allows the touch panel to automatically lock the screen function when the user's head or cheek is close to the screen, so as to avoid the user's cheek touching the keyboard during the call, interrupting the dialogue or causing other wrong actions. However, prior art proximity sensors still require additional external insulators to reduce crosstalk.

The technical problem to be solved by the present invention is to provide a portable electronic device and a short-range optical sensing module thereof for the deficiencies of the prior art.

In order to solve the above technical problem, one of the technical solutions adopted by the present invention is to provide a short-range optical sensing module, comprising: a circuit substrate, a light-emitting component, a short-distance optical sensing component, and a light-transmitting The package structure and a light shielding structure. The light emitting element is disposed on the circuit substrate and electrically connected to the circuit Substrate. The short-range optical sensing component is disposed on the circuit substrate and electrically connected to the circuit substrate, wherein a top end of the short-range optical sensing component has a light sensing region. The light transmissive package structure includes a first package disposed on the circuit substrate and covering the light emitting element, and a second package disposed on the circuit substrate and covering the close proximity optical sensing element . The light shielding structure is disposed on the light transmissive package structure to cover a portion of the first package body and a portion of the second package body, wherein the first package body has a bare body from the light shielding structure And a first exposed surface, the second package has a second exposed surface exposed from the light shielding structure, and the second exposed surface has a portion located at the short-distance optical sensing element An inclined surface above the light sensing area.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a portable electronic device, wherein the portable electronic device uses a short-distance optical sensing module, wherein The short-distance optical sensing module comprises: a circuit substrate, a light-emitting component, a short-distance optical sensing component, a light-transmissive package structure and a light-shielding structure. The light emitting element is disposed on the circuit substrate and electrically connected to the circuit substrate. The short-range optical sensing component is disposed on the circuit substrate and electrically connected to the circuit substrate, wherein a top end of the short-range optical sensing component has a light sensing region. The light transmissive package structure includes a first package disposed on the circuit substrate and covering the light emitting element, and a second package disposed on the circuit substrate and covering the close proximity optical sensing element . The light shielding structure is disposed on the light transmissive package structure to cover a portion of the first package body and a portion of the second package body, wherein the first package body has a bare body from the light shielding structure And a first exposed surface, the second package has a second exposed surface exposed from the light shielding structure, and the second exposed surface has a portion located at the short-distance optical sensing element An inclined surface above the light sensing area.

Thereby, a first projection beam generated by the illuminating element passes through the A reflection of an optical element above the light emitting element and the close proximity optical sensing element to form a first reflected light beam directed toward the inclined surface of the second exposed surface, and the first reflected light beam Reflecting by the inclined surface of the second exposed surface to form a re-reflected light beam remote from the light sensing region of the close proximity optical sensing element. In addition, a second projection beam generated by the illuminating element passes through the optical element and is reflected by an object located above the optical element to form a sloped surface that is directed toward the second exposed surface. a second reflected beam, and the second reflected beam passes through the inclined surface of the second exposed surface and is projected on the light sensing region of the close proximity optical sensing element.

The portable electronic device and the short-range optical sensing module thereof can be provided by the technical solution of the present invention, wherein the second package has a bare appearance from the light-shielding structure. a second exposed surface, and the second exposed surface has a feature of an inclined surface above the light sensing region of the near-range optical sensing element such that the first reflected beam passes The reflection of the inclined surface of the second exposed surface forms a re-reflected light beam remote from the light sensing region of the close proximity optical sensing element. Therefore, the present invention does not need to additionally provide any external insulator, but directly passes through the design of the inclined surface of the second exposed surface to reduce the re-reflected light beam entering the second package and then to the Signal interference generated by the light sensing region of the proximity optical sensing element, thereby reducing both the light emitting element and the short range optical sensing element due to reflection provided by the optical element A crosstalk is generated, and the signal to noise ratio (SNR) of the light source signal received by the short-range optical sensing component is effectively improved.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

P‧‧‧Portable electronic device

M‧‧‧Close Optical Sensing Module

1‧‧‧ circuit substrate

2‧‧‧Lighting elements

3‧‧‧Close optical sensing components

30‧‧‧Light sensing area

4‧‧‧Light-transmissive package structure

41‧‧‧First package

410‧‧‧First exposed surface

42‧‧‧Second package

420‧‧‧Second exposed surface

4200‧‧‧ sloped surface

42001‧‧‧ first end

42002‧‧‧second end

4201‧‧‧ upper surface

4202‧‧‧ side surface

Θ‧‧‧predetermined angle

A‧‧‧projection area

5‧‧‧ shading structure

51‧‧‧ first opening

52‧‧‧second opening

6‧‧‧Optical components

60‧‧‧ shading area

61‧‧‧The first unshielded area

62‧‧‧Second unshielded area

7‧‧‧ objects

L1‧‧‧first projection beam

R1‧‧‧first reflected beam

R1'‧‧‧rereflected beam

L2‧‧‧second projection beam

R2‧‧‧second reflected beam

D1‧‧‧First distance

D2‧‧‧Second distance

Α‧‧‧incidence angle

1 is a partial cross-sectional view of a proximity optical sensing module according to an embodiment of the present invention; intention.

2 is a schematic diagram of an optical path of a short-range optical sensing module in combination with an optical component and an object according to an embodiment of the present invention.

3 is a schematic diagram showing a range of a predetermined incident angle to which a second reflected beam is directed to an inclined surface according to an embodiment of the present invention.

4 is a schematic view of a projection area of an inclined surface of the present invention covering an entire light sensing region of a short-range optical sensing element.

FIG. 5 is a schematic diagram of a portable electronic device using a short-range optical sensing module according to the present invention.

6 is a partial cross-sectional view showing a proximity optical sensing module according to another embodiment of the present invention.

FIG. 7 is a schematic diagram of an optical path of a short-range optical sensing module with an optical component and an object according to another embodiment of the present invention.

The embodiments of the present invention relating to the "portable electronic device and its short-range optical sensing module" are described in the following specific embodiments. Those skilled in the art can understand the present invention from the contents disclosed in the present specification. Advantages and effects. The present invention may be carried out or applied in various other specific embodiments, and various modifications and changes can be made without departing from the spirit and scope of the invention. In addition, the drawings of the present invention are merely illustrative and are not intended to be construed in terms of actual dimensions. The following embodiments will further explain the related technical content of the present invention, but the disclosure is not intended to limit the technical scope of the present invention. Please refer to FIG. 1 to FIG. 7 for the contents disclosed in the following embodiments.

Referring to FIG. 1 and FIG. 2, the present invention provides a short-range optical sensing module M, which includes: a circuit substrate 1, a light-emitting element 2, a short-distance optical sensing element 3, and a transparent package structure. 4 and a light shielding structure 5.

First, as shown in FIG. 1, the light-emitting element 2 is disposed on the circuit substrate 1 and electrically Connected to the circuit board 1. For example, the light emitting element 2 can be an LED wafer or any kind of light emitting wafer. In addition, the short-range optical sensing element 3 is disposed on the circuit substrate 1 and electrically connected to the circuit substrate 1 , and the top end of the close-range optical sensing element 3 has a light sensing region 30 . For example, the short-range optical sensing component 3 can be a proximity sensor (PS) or an Ambient Light Sensor (ALS). Of course, the short-range optical sensing component 3 can also be replaced with a light sensing component composed of both a proximity sensor and an ambient light sensor.

Moreover, as shown in FIG. 1 , the light transmissive package structure 4 includes a first package body 41 disposed on the circuit substrate 1 and covering the light emitting element 2 , and a circuit board 1 disposed on the circuit substrate 1 and covering the near distance optical sensing element 3 . The second package 42. For example, the first package body 41 and the second package body 42 may be two independent encapsulants separated from each other, or the first package body 41 and the second package body 42 may also be an integrally formed single encapsulation colloid. In addition, both the first package body 41 and the second package body 42 can be made of a transparent adhesive material such as epoxy or silicone.

In addition, as shown in FIG. 1 , the light shielding structure 5 is disposed on the light transmissive package structure 4 to cover a portion of the first package body 41 and a portion of the second package body 42 . Furthermore, the first package body 41 has a first exposed surface 410 exposed from the light shielding structure 5, the second package body 42 has a second exposed surface 420 exposed from the light shielding structure 5, and a second The exposed surface 420 has an inclined surface 4200 located above the light sensing region 30 of the proximity optical sensing element 3. For example, the light shielding structure 5 provides a first opening 51 corresponding to the light emitting element 2 and a second opening 52 corresponding to the short distance optical sensing element 3, whereby the first exposed surface 410 of the first package body 41 The second exposed surface 420 of the second package 42 is exposed from the first opening 51 and the second opening 52 of the light shielding structure 5, respectively.

In one embodiment of the present invention, as shown in FIG. 1 and FIG. 2, a first projection light beam L1 generated by the light-emitting element 2 can pass above both the light-emitting element 2 and the close-range optical sensing element 3. Reflection of an optical element 6 to shape The first reflected light beam R1 is directed to the inclined surface 4200 of the second exposed surface 420, and the first reflected light beam R1 can be reflected by the inclined surface 4200 of the second exposed surface 420 to form a remote optical sensing element 3 The re-reflected light beam R1' of the light sensing region 30. Furthermore, a second projection beam L2 generated by the illuminating element 2 can pass through the optical element 6 and be reflected by an object 7 located above the optical element 6 to form an inclined surface 4200 directed to the second exposed surface 420. The second reflected light beam R2, and the second reflected light beam R2 can pass through the inclined surface 4200 of the second exposed surface 420 and is projected onto the light sensing region 30 of the short-range optical sensing element 3.

It is worth mentioning that, as shown in FIG. 2, the outer surface of the optical element 6 has a light shielding region 60, a first unshielding region 61 and a second unshielding region 62, and the first unshielded region 61 and the second unshielded region. 62 are separated from each other by a predetermined distance. For example, the light-shielding region 60 can be formed on the outer surface of the optical element 6 by coating the opaque material, and the first unshielded region 61 and the second unshielded region 62 are not coated with opaque. The area of the material. Therefore, the light-shielding region 60 of the optical element 6 acts like a mirror, so that the first projected light beam L1 generated by the light-emitting element 2 can be reflected by the light-shielding region 60 of the optical element 6 to form the first reflected light beam R1. In addition, the first unshielded region 61 and the second unshielded region 62 of the optical element 6 function like a window, so that the second projected light beam L2 generated by the light-emitting element 2 can pass through the first unshielded light of the optical element 6. The region 61 is projected onto the object 7, and the second reflected light beam R2 is allowed to pass through the second unshielded region 62 of the optical element 6 to be projected on the light sensing region 30.

It is worth mentioning that, as shown in FIG. 2, the second reflected light beam R2 formed by the reflection of the second projection light beam L2 through the object 7 is a diffuse reflection. In addition, since the second unshielded region 62 of the optical element 6 is designed to have a predetermined width limitation, the second reflected light beam R2 within a range of a predetermined incident angle α can pass through the second unshielded region of the optical element 6. 62 is directed to the inclined surface 4200 of the second exposed surface 420. Therefore, it is very clear that the incident angle of the second reflected light beam R2 projected on the inclined surface 4200 is much smaller than the incident angle at which the first reflected light beam R1 is projected on the inclined surface 4200. In other words, the second reflected beam R2 will be much wider than Less than the first reflected light beam R1 is more easily projected through the inclined surface 4200 of the second exposed surface 420 onto the light sensing region 30 of the short-range optical sensing element 3, thereby reducing the first reflected light beam R1 at the light-emitting element 2 The crosstalk effect generated between the short-distance optical sensing component 3 and the signal-to-noise ratio of the light source signal received by the short-range optical sensing component 3 is effectively improved.

Therefore, in conjunction with FIG. 1 to FIG. 3, the present invention does not need to provide any external insulator, but directly passes through the design of the inclined surface 4200 of the second exposed surface 420 to reduce the re-reflected light beam R1' into the second package. 42 is then directed to the signal interference generated by the light sensing region 30 of the near-field optical sensing element 3, thereby reducing both the light-emitting element 2 and the short-range optical sensing element 3 due to the reflection provided by the optical element 6. A crosstalk is generated between the two, and the signal to noise ratio (SNR) of the light source signal received by the short-range optical sensing component 3 is effectively improved.

For example, as shown in FIG. 1 and FIG. 2, the second exposed surface 420 has an upper surface 4201, and the inclined surface 4200 is inclined downward with respect to the upper surface 4201 by a predetermined angle θ between 15 degrees and 45 degrees. . In addition, the inclined surface 4200 has a first end 42001 near the light-emitting element 2 and a second end 42002 opposite to the first end 42001 and away from the light-emitting element 2, and the first end 42001 of the inclined surface 4200 is closely spaced optically sensed. The first distance D1 of the top end of the element 3 may be greater than the second distance D2 of the second end 42002 of the inclined surface 4200 from the top end of the close proximity optical sensing element 3. It should be noted that, as shown in FIG. 1 and FIG. 4, a projection area A formed by the oblique surface 4200 of the second exposed surface 420 perpendicularly projected onto the top end of the close-range optical sensing element 3 can cover the near-distance optical sense. Measuring the entire light sensing region 30 of the component 3, thereby ensuring that the first reflected light beam R1 can indeed pass through the reflection of the inclined surface 4200 of the second exposed surface 420 to form a light sensing region remote from the close proximity optical sensing element 3. A re-reflected beam R1' of 30.

It is to be noted that, as shown in FIG. 5, the present invention further provides a portable electronic device P, and the portable electronic device P uses a close-range optical sense. Test module M. As shown in FIG. 1 and FIG. 5 , the short-range optical sensing module M includes a circuit substrate 1 , a light-emitting component 2 , a short-range optical sensing component 3 , a light-transmissive package structure 4 , and a light-shielding structure 5 . Therefore, the short-range optical sensing module M provided by the present invention can be applied to any portable electronic device P, such as a smart phone or a notebook computer.

In another embodiment of the present invention, as shown in FIG. 6 and FIG. 7, a first projection light beam L1 generated by the light-emitting element 2 can pass above both the light-emitting element 2 and the close-range optical sensing element 3. The reflection of an optical element 6 forms a first reflected light beam R1 directed toward the inclined surface 4200 of the second exposed surface 420, and the first reflected light beam R1 can be reflected by the inclined surface 4200 of the second exposed surface 420 to form A re-reflected light beam R1' away from the light sensing region 30 of the close proximity optical sensing element 3. Furthermore, a second projection beam L2 generated by the illuminating element 2 can pass through the optical element 6 and be reflected by an object 7 located above the optical element 6 to form an inclined surface 4200 directed to the second exposed surface 420. The second reflected light beam R2, and the second reflected light beam R2 can pass through the inclined surface 4200 of the second exposed surface 420 and is projected onto the light sensing region 30 of the short-range optical sensing element 3.

Furthermore, as shown in FIG. 6, the second exposed surface 420 has an upper surface 4201 and a side surface 4202 extending downward from the upper surface 4201, and the inclined surface 4200 is inclined downward from the side surface 4202 by 15 degrees. A predetermined angle θ between 45 degrees. That is to say, according to different design requirements, the inclined surface 4200 can be directly inclined downward from the upper surface 4201 of the second exposed surface 420 (as shown in FIG. 1), or the inclined surface 4200 can be directly The side surface 4202 of the second exposed surface 420 extends obliquely downward (as shown in FIG. 6).

It should be noted that, as shown in FIG. 1, if the inclined surface 4200 is directly inclined downward from the upper surface 4201 of the second exposed surface 420, the inclined surface 4200 is inclined downward with respect to the upper surface 4201. The predetermined angle θ has a wide range of angle adjustment space. In addition, as shown in FIG. 6, if the inclined surface 4200 is directly inclined downward from the side surface 4202 of the second exposed surface 420, there may be The effect shortens the distance between the inclined surface 4200 and the top end of the short-range optical sensing element 3.

[Advantageous Effects of Embodiments]

The portable electronic device P and the short-range optical sensing module M provided by the technical solution of the present invention can be provided by the second package 42 having a light-emitting structure 5 exposed. a second exposed surface 420, and the second exposed surface 420 has a technical feature of an inclined surface 4200" located above the light sensing region 30 of the proximity optical sensing element 3 such that the first reflected light beam R1 can pass through the second The reflection of the inclined surface 4200 of the exposed surface 420 forms a re-reflected light beam R1' remote from the light sensing region 30 of the close proximity optical sensing element 3. Therefore, the present invention does not need to provide any external insulator, but directly passes through the design of the inclined surface 4200 of the second exposed surface 420 to reduce the re-reflected light beam R1' entering the second package 42 and then to the near-field optical sensing. The signal generated by the light sensing region 30 of the component 3 interferes with thereby reducing the crosstalk between the light emitting component 2 and the short-range optical sensing component 3 due to the reflection provided by the optical component 6. And effectively improving the signal to noise ratio (SNR) of the light source signal received by the short-range optical sensing component 3.

The above disclosure is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, any equivalent technical changes made by using the present specification and the contents of the drawings are included in the application of the present invention. Within the scope of the patent.

M‧‧‧Close Optical Sensing Module

1‧‧‧ circuit substrate

2‧‧‧Lighting elements

3‧‧‧Close optical sensing components

30‧‧‧Light sensing area

4‧‧‧Light-transmissive package structure

41‧‧‧First package

42‧‧‧Second package

4200‧‧‧ sloped surface

5‧‧‧ shading structure

6‧‧‧Optical components

60‧‧‧ shading area

61‧‧‧The first unshielded area

62‧‧‧Second unshielded area

7‧‧‧ objects

L1‧‧‧first projection beam

R1‧‧‧first reflected beam

R1'‧‧‧rereflected beam

L2‧‧‧second projection beam

R2‧‧‧second reflected beam

Claims (10)

A short-range optical sensing module includes: a circuit substrate; a light-emitting element disposed on the circuit substrate and electrically connected to the circuit substrate; a close-range optical sensing component The short-distance optical sensing component is disposed on the circuit substrate and electrically connected to the circuit substrate, wherein a top end of the short-range optical sensing component has a light sensing region; The light-transmissive package structure includes a first package disposed on the circuit substrate and covering the light-emitting element, and a second package disposed on the circuit substrate and covering the close-range optical sensing element; And a light shielding structure, the light shielding structure is disposed on the light transmissive package structure to cover a portion of the first package body and a portion of the second package body, wherein the first package body has a slave a first exposed surface exposed by the light shielding structure, the second package body has a second exposed surface exposed from the light shielding structure, and the second exposed surface has The inclined surface located near the top of the light-sensing region of the optical sensing element. The proximity optical sensing module of claim 1, wherein the second exposed surface has an upper surface, the inclined surface is inclined downward by a predetermined angle with respect to the upper surface, and the second exposed a projection area formed by the inclined surface of the surface perpendicularly projected onto the top end of the close-range optical sensing element can cover the entire light sensing area of the short-range optical sensing element, wherein The tilting mask has a first end adjacent to the light emitting element and a second end opposite to the first end and away from the light emitting element, and the first end of the inclined surface is apart from the close distance The distance from the top end of the optical sensing element is greater than the second optical end of the inclined surface The distance of the tip of the component is measured. The proximity optical sensing module of claim 1, wherein the second exposed surface has an upper surface and a side surface extending downward from the upper surface, the inclined surface from the side surface Tilting downward by a predetermined angle, and a projection area formed by vertically projecting the inclined surface of the second exposed surface onto the top end of the short-range optical sensing element can cover the near-field optical sensing The entire light sensing region of the component, wherein the tilt mask has a first end proximate the light emitting element and a second end opposite the first end and remote from the light emitting element, and The first end of the inclined surface is at a distance from the top end of the close-range optical sensing element that is greater than the distance of the second end of the inclined surface from the top end of the close-range optical sensing element. The short-range optical sensing module of claim 1, wherein a first projected light beam generated by the light-emitting element passes through one of the light-emitting element and the short-range optical sensing element Reflecting the optical element to form a first reflected beam directed toward the inclined surface of the second exposed surface, and the first reflected beam passes through the reflection of the inclined surface of the second exposed surface to form a re-reflecting beam that is remote from the light sensing region of the near-field optical sensing element. The short-range optical sensing module of claim 4, wherein a second projection beam generated by the illuminating element passes through the optical element and is reflected by an object located above the optical element, Forming a second reflected light beam directed toward the inclined surface of the second exposed surface, and the second reflected light beam passes through the inclined surface of the second exposed surface and projected at the close distance optical sensation On the light sensing area of the measuring element. A portable electronic device, wherein the portable electronic device uses a short-range optical sensing module, wherein the short-range optical sensing module comprises: a circuit substrate; a light-emitting component; The light emitting element is disposed on the circuit substrate and electrically connected a short-circuit optical sensing component disposed on the circuit substrate and electrically connected to the circuit substrate, wherein the short-range optical sensing component is The top end has a light sensing region; a light transmissive package structure, the light transmissive package structure includes a first package disposed on the circuit substrate and covering the light emitting element, and a first package disposed on the circuit substrate a second package covering the short-range optical sensing element; and a light shielding structure disposed on the light-transmissive package structure to cover a portion of the first package and the second package a portion of the body, wherein the first package has a first exposed surface exposed from the light shielding structure, and the second package has a second exposed surface exposed from the light shielding structure. And the second exposed surface has an inclined surface located above the light sensing region of the close-range optical sensing element. The portable electronic device of claim 6, wherein the second exposed surface has an upper surface, the inclined surface is inclined downward by a predetermined angle with respect to the upper surface, and the second exposed surface is a projection area formed by the inclined surface perpendicularly projected onto the top end of the short-range optical sensing element can cover the entire light sensing area of the short-range optical sensing element, wherein the tilt The mask has a first end adjacent to the light emitting element and a second end opposite the first end and away from the light emitting element, and the first end of the inclined surface is spaced apart from the close optical sense The distance of the tip end of the measuring element is greater than the distance of the second end of the inclined surface from the top end of the close-range optical sensing element. The portable electronic device of claim 6, wherein the second exposed surface has an upper surface and a side surface extending downward from the upper surface, the inclined surface being downward from the side surface Tilting a predetermined angle, and the inclined surface of the second exposed surface is vertically projected to the top of the short-range optical sensing element A projection area formed on the end can cover the entire light sensing area of the short-range optical sensing element, wherein the tilting mask has a first end adjacent to the light-emitting element and a opposite to the a first end and away from the second end of the light emitting element, and the first end of the inclined surface is at a distance from the top end of the close proximity optical sensing element that is greater than the second end of the inclined surface The distance of the ends from the top end of the close-range optical sensing element. The portable electronic device of claim 6, wherein the first projection beam generated by the illuminating element passes through an optical component located above both the illuminating element and the close optical sensing element. Reflecting to form a first reflected beam directed toward the inclined surface of the second exposed surface, and the first reflected beam passes through the reflection of the inclined surface of the second exposed surface to form a distance A re-reflecting beam of the light sensing region of the proximity optical sensing element. The portable electronic device of claim 9, wherein a second projection beam generated by the illuminating element passes through the optical element and is reflected by an object located above the optical element to form a second reflected light beam directed toward the inclined surface of the second exposed surface, and the second reflected light beam passes through the inclined surface of the second exposed surface and projected on the close-range optical sensing element On the light sensing area.