Proximity sensor and electronic equipment

Abstract

The embodiment of the utility model provides a proximity sensor and electronic equipment, and the proximity sensor comprises a substrate which is provided with an infrared signal receiving region; the coating layer is arranged on the upper surface of the infrared signal receiving area; the visible light inhibition film is arranged on the outer surface of the coating layer; visible light is cut off through the visible light inhibition film and the coating layer, and infrared light is received by the infrared signal receiving area through the visible light inhibition film and the coating layer. According to the embodiment of the invention, the proximity sensor can detect whether an object exists above the proximity sensor more accurately. According to the embodiment of the invention, the problem that corresponding components are mistakenly turned on and off due to the fact that the proximity sensor of the electronic equipment cannot accurately detect whether an object exists above the proximity sensor is avoided.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of sensor technology, and in particular to a proximity sensor and an electronic device. Background Art

[0002] The proximity sensor is used to detect whether there is an object above the detector. If there is an object, the switch of the corresponding component of the electronic device is adjusted to turn on; otherwise, the switch of the corresponding component is kept off. For example, if the proximity sensor detects that there is a user's finger above the fingerprint detector, the screen will be awakened; otherwise, the screen will not be awakened, thereby avoiding accidental touches of the screen. The proximity sensor includes NIR PD (near infrared photodiode) and NIR LED (near infrared light emitting diode). The infrared light emitted by NIR LED at a close distance irradiates the existing object to form infrared reflected light; NIR PD detects the infrared reflected light to accurately detect whether there is an object.

[0003] Since visible light interferes with infrared reflected light, it seriously affects the accuracy of proximity sensors in detecting whether there is an object. Electronic devices cannot accurately detect whether there is an object above them, resulting in the corresponding components turning on and off incorrectly. Utility Model Content

[0004] In view of this, an embodiment of the present application provides a proximity sensor to at least partially solve the above problems.

[0005] In the first aspect, according to an embodiment of the present application, a proximity sensor is provided, comprising: a substrate, on which an infrared signal receiving area is provided; a coating layer, the coating layer is arranged on the upper surface of the infrared signal receiving area; a visible light inhibition film, the visible light inhibition film is arranged on the outer surface of the coating layer; visible light is cut off by passing through the visible light inhibition film and the coating layer, and infrared light is received by the infrared signal receiving area by passing through the visible light inhibition film and the coating layer.

[0006] In a second aspect, an electronic device is provided according to an embodiment of the present application, comprising the above-mentioned proximity sensor and a display screen, wherein the display screen covers a surface of the proximity sensor.

[0007] According to the proximity sensor and electronic device provided by the embodiment of the present application, a visible light suppression film is added to the outer surface of the coating layer, and the visible light suppression film achieves secondary cutoff of visible light by cooperating with the coating layer, and makes the response of the infrared signal receiving area to visible light less than 1%, and does not affect the infrared light passing through the visible light suppression film and the coating layer to be received by the infrared signal receiving area. The embodiment of the present application enables the proximity sensor to more accurately detect whether there is an object above it, and avoids the corresponding component of the electronic device being erroneously switched on and off due to the inability of the proximity sensor to accurately detect whether there is an object above it. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0009] Figure 1 is a cross-sectional view according to an embodiment of a proximity sensor;

[0010] Figure 2 is a cross-sectional view of an implementation manner of a proximity sensor according to an embodiment of the present application;

[0011] Figure 3 is a cross-sectional view of another implementation of a proximity sensor according to an embodiment of the present application;

[0012] Figure 4 is a cross-sectional view of yet another implementation of a proximity sensor according to an embodiment of the present application;

[0013] Figure 5 A comparison curve diagram of visible light response of a proximity sensor with a visible light inhibition film and a proximity sensor without a visible light inhibition film according to an embodiment of the present application;

[0014] Figure 6 Schematic diagram of an electronic device having a proximity sensor according to an embodiment of the present application.

[0015] Description of reference numerals:

[0016] Electronic equipment 1000;

[0017] Proximity sensor 100;

[0018] Base 10; infrared signal receiving area 101;

[0019] Coating layer 20;

[0020] Visible light suppression film 30;

[0021] Display screen 200. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0023] The proximity sensor includes a NIR PD (near infrared photodiode) and a NIR LED (near infrared light emitting diode). The NIR PD (near infrared photodiode) is arranged on a substrate, and an infrared signal receiving area is arranged on the substrate. The infrared light emitted by the NIR LED at a close distance irradiates the existing object, forming infrared reflected light; the NIR PD detects the infrared reflected light and accurately detects whether there is an object. Among them, the substrate can be a silicon substrate, which is a semiconductor material and has semiconductor properties.

[0024] See also Figure 1 A coating layer 20 such as an IR-pass (infrared-transmitting organic material) glue, an IR filter (infrared-transmitting coating material) coating, an InGaAs (indium gallium arsenide compound) detection layer, etc. is arranged above the infrared signal receiving area 101 provided on the substrate 10. The optical characteristics of the above coating layers are used to achieve a portion of visible light cutoff, and the infrared light is received by the infrared signal receiving area 101 through the coating layer 20, thereby enhancing the effect of the infrared light receiving area receiving infrared light.

[0025] However, although the above-mentioned coating layer 20 has a certain cutoff effect on visible light, it still cannot further prevent the influence of visible light on the infrared light receiving effect, thereby affecting the detection accuracy of the proximity sensor for the presence of an object, causing the components of the electronic device to switch on and off incorrectly. For example, when a mobile phone is making a call, the proximity sensor mistakenly detects the presence of an object, and the mobile phone screen lights up.

[0026] In order to further solve the above technical defects, the embodiment of the present application adds a visible light suppression film 30 on the outer surface of the coating layer 20. The visible light suppression film 30 achieves secondary cutoff of visible light by cooperating with the coating layer 20, and makes the response of the infrared signal receiving area 101 to visible light less than 1%, and does not affect the infrared light passing through the visible light suppression film 30 and the coating layer 20 to be received by the infrared signal receiving area 101. The embodiment of the present application can enable the proximity sensor to more accurately detect whether there is an object above it, and avoid the corresponding component of the electronic device being erroneously switched on and off because the proximity sensor cannot accurately detect whether there is an object above it.

[0027] Therefore, the following Figure 2-Figure 6 The proximity sensor 100 according to the embodiment of the present application is described in detail.

[0028] A proximity sensor 100 according to an embodiment of the present application includes a substrate 10, a coating layer 20 and a visible light suppression film 30. An infrared signal receiving area 101 is provided on the substrate 10, and the infrared signal receiving area 101 can be used to receive reflected infrared light signals.

[0029] Specifically, the infrared signal receiving area 101 is an area where a NIR PD (near infrared photodiode) is set.

[0030] When there is an object (eg, a finger) above the proximity sensor 100 , infrared light is reflected on the surface of the object, and the infrared signal receiving area 101 of the proximity sensor 100 receives the infrared reflected light.

[0031] The coating layer 20 is disposed on the upper surface of the infrared signal receiving area 101 of the substrate 10 . The coating layer 20 can effectively perform secondary cutoff on visible light and allow infrared light to pass through.

[0032] In order to further improve the cutoff effect of the coating layer 20 on visible light, see Figure 2 The coating layer 20 covers the upper surface of the infrared signal receiving area of ​​the substrate 10 .

[0033] Further, see Figure 3 The area of ​​the coating layer 20 is larger than the area of ​​the infrared signal receiving area 101 , thereby being able to better prevent visible light from being received by the infrared signal receiving area 101 .

[0034] Specifically, the coating layer 20 can be one of IR-pass (infrared-transmitting organic material) glue, IR filter (infrared-transmitting coating material) coating, InGaAs (indium gallium arsenide compound) detection layer, etc.

[0035] See also Figure 2 as well as Figure 3 The proximity sensor 100 of the embodiment of the present application is additionally provided with a visible light suppression film 30, which is disposed on the outer surface of the coating layer 20. Visible light is cut off by the visible light suppression film 30 and the coating layer 20, and infrared light is received by the infrared signal receiving area 101 by the visible light suppression film 30 and the coating layer 20.

[0036] The embodiment of the present application realizes secondary cutoff of visible light through the cooperation of the visible light suppression film 30 and the coating layer 20, and makes the response of the infrared signal receiving area to visible light less than 1%, and does not affect the infrared light passing through the visible light suppression film 30 and the coating layer 20 to be received by the infrared signal receiving area 101. The embodiment of the present application enables the proximity sensor 100 to more accurately detect whether there is an object above it, and avoids the corresponding components of the electronic device from being erroneously switched on and off because the proximity sensor 100 cannot accurately detect whether there is an object above it.

[0037] Specifically, the visible light low transmittance of the visible light suppression film 30 is less than 10%, and the infrared transmittance is greater than 80%, so that the visible light passing through the visible light suppression film 30 and the coating layer 20 is better cut off.

[0038] In some specific implementations of the embodiments of this application, see Figure 2 as well as Figure 3 The visible light suppression film 30 covers the upper surface of the coating layer 20 , so that the visible light suppression film 30 and the coating layer 20 can be more closely attached to each other. Through the cooperation of the two, the secondary cutoff of visible light is further improved.

[0039] In some other specific implementations of the embodiments of the present application, see Figure 4 The visible light suppression film 30 also covers the side surface of the coating layer 20 .

[0040] Therefore, it can be seen that since the side of the coating layer 20 is also covered by the visible light suppression film 30, there is no light leakage problem. Therefore, the proximity sensor 100 of the embodiment of the present application can effectively prevent visible light from passing through the side of the coating layer 20, causing the coating layer 20 to leak light.

[0041] In some specific implementations of the embodiments of the present application, in order to further improve the visible light suppression effect achieved by the cooperation between the visible light suppression film 30 and the coating layer 20 , the visible light suppression film 30 evenly covers the surface of the coating layer 20 .

[0042] Specifically, the visible light suppression film 30 is a one-time coating film formed by patterning. The visible light suppression film 30 is coated and subjected to patterning steps such as exposure and development, and evenly covers the surface of the coating layer 20, so that the visible light suppression film 30 is easy to set and has low cost.

[0043] In some embodiments of the present invention, the thickness of the visible light suppression film 30 is 0.2-4 microns. Those skilled in the art will understand that the thicker the visible light suppression film 30 is, the better its cutoff capability for visible light is. Similarly, the transmittance relative to infrared will also be reduced. Therefore, the thickness of the visible light suppression film 30 in the example of the present invention is preferably 2 mm (millimeter). It can have both good visible light cutoff capability and high infrared transmittance.

[0044] In some specific implementations of the embodiments of the present application, the material of the visible light suppression film 30 can be organic material or inorganic material, such as blue glue or IRP (IR-pass / IRP infrared transparent organic material) and other materials that have a high inhibitory effect on visible light and a high transmittance to 940nm (infrared). This material can further suppress the response of visible light and achieve a visible light response of less than 1%.

[0045] See also Figure 5 , the vertical axis is QE, which indicates the response, and the horizontal axis indicates the band. Figure 5 PS in FIG. 1 represents a proximity sensor 100 . Figure 5 The image shows the response of visible light in the wavelength range of 400 to 800 nm when the visible light suppression film 30 is not provided and when the visible light suppression film 30 is provided.

[0046] The embodiment of the present application can improve the cutoff effect of the proximity sensor 100 at visible light of 400-750 nm. When the visible light suppression film 30 is not provided, the actual response of the visible light of 400-750 nm is greater than or equal to 1% (e.g. Figure 5 After the visible light suppression film 30 is added, the visible light response of 400-750nm can be reduced to less than 1% (as shown in the middle line L1). Figure 5 midline L2).

[0047] The embodiment of the present application enables the proximity sensor 100 to more accurately detect whether there is an object above it. The embodiment of the present application avoids the corresponding components of the electronic device 1000 from being erroneously switched on and off due to the proximity sensor 100 being unable to accurately detect whether there is an object above it.

[0048] like Figure 6 FIG. 1 is a schematic diagram of an electronic device 1000 according to a second embodiment of the present application, which comprises the proximity sensor 100 and the display screen 200 according to the first embodiment.

[0049] According to the electronic device 1000 of the second aspect embodiment of the present application, since it has the proximity sensor 100 of the first aspect embodiment, it has the same beneficial effects as the proximity sensor 100 of the first aspect embodiment. The electronic device 1000 also includes a display screen 200, and the display screen 200 covers the surface of the proximity sensor 100. The display screen 200 can display the running state of the electronic device 1000, and the proximity sensor 100 can be protected by the display screen 200, and the proximity sensor 100 can also operate the signal receiving function normally through the display screen 200. The electronic device 1000 has a proximity sensor 100 provided with a visible light suppression film 30, so it can accurately detect whether there is an object above it, avoiding the wrong switching of the corresponding component.

[0050] The electronic device 1000 of this embodiment can be executed by any appropriate electronic device with data processing capability, including but not limited to: a server, a mobile terminal (such as a mobile phone, a tablet computer or a smart watch, etc.) and a PC, etc. By applying the proximity sensor 100 of the first aspect of the present application to a variety of electronic devices 1000, the electronic device 1000 has the ability to detect whether there is an object above it, thereby avoiding the erroneous switching of the corresponding components.

[0051] The above implementation methods are only used to illustrate the embodiments of the present application, and are not limitations on the embodiments of the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present application. The scope of patent protection of the embodiments of the present application should be limited by the claims.

Claims

1. A proximity sensor, characterized in that: include: A substrate, wherein an infrared signal receiving area is provided on the substrate; A coating layer, the coating layer being arranged on the upper surface of the infrared signal receiving area; A visible light suppression film, the visible light suppression film being disposed on the outer surface of the coating layer; Visible light is cut off by passing through the visible light suppression film and the coating layer, and infrared light is received by the infrared signal receiving area by passing through the visible light suppression film and the coating layer.

2. The proximity sensor according to claim 1, characterized in that: The visible light suppression film covers the upper surface of the coating layer.

3. The proximity sensor according to claim 1 or 2, characterized in that: The visible light suppression film covers the side surface of the coating layer.

4. The proximity sensor according to claim 1, characterized in that: The visible light suppression film uniformly covers the outer surface of the coating layer.

5. The proximity sensor according to claim 1, characterized in that: The coating layer covers the upper surface of the infrared signal receiving area.

6. The proximity sensor according to claim 5, characterized in that: The area of ​​the coating layer is larger than the area of ​​the infrared signal receiving area.

7. The proximity sensor according to claim 1, characterized in that: The visible light suppression film has a low visible light transmittance of less than 10% and an infrared transmittance of greater than 80%.

8. The proximity sensor according to claim 1, characterized in that: The visible light suppression film is a one-time coating film formed by patterning.

9. The proximity sensor according to claim 1, characterized in that: The thickness of the visible light suppression film is greater than or equal to 0.2 micrometers and less than or equal to 4 micrometers.

10. An electronic device comprising: The proximity sensor according to any one of claims 1 to 9; A display screen covers the surface of the proximity sensor.

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