CN203013726U - Image sensor module group and handheld type electronic device - Google Patents

Abstract

The utility model relates to an image sensor module group and a handheld type electronic device. The image sensor module group comprises a circuit substrate, an image sensor having a photosensitive unit, an optical lens, a light-emitting module, and a band-pass filtering sheet. The optical lens is arranged above the image sensor; and the optical center thereof and the photosensitive center of the photosensitive unit are arranged on the same axis. The light-emitting module that is arranged on the circuit substrate around the image sensor includes an infrared light-emitting diode. The band-pass filtering sheet that is arranged above the optical lens or is arranged between the optical lens and the image sensor enables visual lights in the infrared light and the ambient light to be transmitted and enter the optical lens. And the photosensitive unit detects the visual lights and the infrared light, converts the obtained optical signal into the electric signal and sends the converted electric signal to the circuit substrate. In addition, the provided handheld type electronic device consists of the image sensor module group and a display screen; and the display screen includes a backlight source. And the circuit substrate adjusts the brightness of the backlight source according to the electric signal corresponding to the visual light and controls the turning on and turning off of the backlight source according to the electric signal corresponding to the infrared light. Moreover, the device size can be reduced and the production cost can be lowered.

Description

Image sensor modules and handheld electronic devices

technical field

The utility model relates to the technical field of integrated circuits, in particular to an image sensor module and a hand-held electronic device.

Background technique

With the development of hand-held electronic devices such as smartphones and tablet computers, image sensors for taking pictures or videos have become the basic configuration of the above-mentioned electronic devices, and touch-type operations gradually replace button-type operations. Taking the touch-type mobile phone as an example, since the user's face is close to the touch screen of the mobile phone when the user is talking, the mobile phone will be falsely triggered. Therefore, an infrared (Infrared, IR) proximity sensor including an infrared emitting device and an infrared receiving device is usually installed on the mobile phone. , when the infrared proximity sensor detects that the light is blocked, the mobile phone thinks that the face is close to the touch screen, so as to turn off the touch screen to prevent misoperation due to the close proximity of the face, and can save power during the call.

For more technology related to the infrared proximity sensor, please refer to the Chinese patent application document with publication number CN102265252A.

In addition, in the prior art, an ambient light detection sensor is also installed in the electronic device to detect the brightness of the ambient light, and based on this, the brightness of the display screen of the electronic device is automatically adjusted, so that it can be more suitable for the observation of the human eye, and Can save power.

However, the handheld electronic devices in the prior art all use a three-in-one light sensing module to realize the functions of ambient light detection and proximity detection. Referring to FIG. 1, the handheld electronic devices in the prior art generally include:

display screen 10;

The image sensor module 20 includes: an optical lens, an image sensor and a first circuit substrate, the first circuit substrate is electrically connected to the display screen 10;

The three-in-one light sensing module 30 includes: an ambient light detection sensor, an infrared proximity sensor, an LED indicator light and a second circuit substrate, and the second circuit substrate is electrically connected to the display screen 10 .

Since the above two modules are independent devices, including circuit substrates respectively, it not only increases the difficulty of the structural design of the electronic device, but also takes up a large volume, which is not conducive to the integration of electronic devices and the miniaturization of electronic equipment. This ultimately increases production costs.

In addition, in the prior art, the three-in-one light-sensing module 30 can also be replaced by a two-in-one light-sensing module. Compared with the three-in-one light-sensing module 30, the two-in-one light-sensing module The measurement module does not include an infrared emitting device (such as an infrared light-emitting diode), so an additional infrared emitting device needs to be added, which will further increase the volume of the device and increase the production cost. Therefore, how to reduce the size of the device and reduce the production cost on the premise of having the functions of the proximity sensor and the ambient light detection sensor at the same time has become one of the problems to be solved urgently by those skilled in the art.

Utility model content

The problem solved by the utility model is to provide an image sensor module and a hand-held electronic device, which have a simple structural design, a small occupied volume, and low production costs.

In order to solve the above problems, the utility model provides an image sensor module, including:

Circuit substrate;

an image sensor located on the circuit substrate and electrically connected to the circuit substrate, the image sensor includes a photosensitive unit;

an optical lens, located above the image sensor, and the optical center of the optical lens is on the same axis as the photosensitive center of the photosensitive unit;

A light-emitting module, located on the circuit substrate around the image sensor, includes an infrared light-emitting diode for emitting infrared light;

A band-pass filter, located above the optical lens or between the optical lens and the image sensor, is used to transmit visible light in the infrared light and ambient light into the optical lens;

The photosensitive unit is used to detect the visible light and the infrared light, convert the obtained light signal into an electrical signal and send it to the circuit board.

Optionally, the wavelength range of the infrared light includes: 780nm~2500nm.

Optionally, the wavelength of the infrared light is 850nm or 910nm or 940nm.

Optionally, the light emitting module further includes a visible light emitting diode for emitting visible light.

Optionally, the image sensor is a CMOS (Complementary Metal Oxide Semiconductor) image sensor or a CCD (Charge Coupled Device) image sensor.

Optionally, the emission wavelength of the infrared light emitting diode includes: λ1-Δλ1~λ1+Δλ1, the bandpass wavelength of the bandpass filter includes: λ2-Δλ2~λ2+Δλ2, and 0≤|λ2-λ1| ≤Δλ1+Δλ2.

Optionally, the transmittance range of the infrared light emitted by the infrared light-emitting diode through the band-pass filter includes: 2%-98%.

Optionally, the range of distance between the infrared light emitting diode and the band-pass filter includes: 0.05cm~3cm.

In order to solve the above problems, the utility model also provides a hand-held electronic device, including the above-mentioned image sensor module and a display screen, the display screen includes a backlight, the backlight is connected to the circuit substrate, and the circuit The substrate adjusts the brightness of the backlight source according to the electrical signal corresponding to the visible light, and controls to turn off the backlight source according to the electrical signal corresponding to the infrared light.

Optionally, when the intensity of the infrared light is less than or equal to a preset threshold, the circuit board controls to turn off the backlight.

Optionally, the handheld electronic device is a mobile phone or a tablet computer.

Compared with the prior art, the technical solution of the utility model has the following advantages:

1) In this utility model, an infrared light-emitting diode for emitting infrared light is added to the image sensor module, and an optical lens and a band-pass filter allow the infrared light and visible light to simultaneously transmit into the photosensitive unit of the image sensor. The unit can detect the visible light and the infrared light, convert the optical signal into a corresponding electrical signal, and then process the two signals by a circuit substrate, thereby omitting the three-in-one light sensing module, and at the same time, the infrared proximity sensor The function of the ambient light detection sensor is integrated in the image sensor module, which realizes high integration of function and design, simplifies the difficulty of structural design, increases the reliability of electronic products, and reduces the occupied volume of the device. Reduced production costs.

2) In an optional solution, the image sensor module can also include light-emitting diodes for emitting visible light, so that the image sensor module integrates all the functions of the three-in-one light sensing module at the same time, further improving the device function and design The degree of integration increases the reliability of the product.

Description of drawings

FIG. 1 is a schematic structural view of a handheld electronic device in the prior art;

Fig. 2 is a schematic structural view of the handheld electronic device in Embodiment 1 of the present utility model;

FIG. 3 is a schematic structural view of the handheld electronic device in Embodiment 2 of the present invention.

Detailed ways

In order to make the above purpose, features and advantages of the present utility model more obvious and understandable, the specific implementation of the present utility model will be described in detail below in conjunction with the accompanying drawings.

In the following description, a lot of specific details have been set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways different from those described here, so the utility model is not limited by the specific embodiments disclosed below limit.

As mentioned in the background technology section, on the premise of realizing the functions of taking pictures and taking pictures, the handheld electronic devices in the prior art all use the image sensor module and the three-in-one light-sensing module at the same time in order to avoid misoperation and realize the purpose of energy saving. As a result, two circuit substrates are required, and the structural design is relatively complicated, and the volume of the manufactured electronic device is relatively large, which eventually leads to an increase in production cost.

In view of the above problems, the utility model provides an image sensor module and a hand-held electronic device. By additionally setting infrared light-emitting diodes and increasing the functions of a band-pass filter, a photosensitive unit and a circuit substrate, the three-in-one photosensor module The main functions of the group are integrated in the image sensor module, which saves at least one circuit substrate, an infrared receiving device and an ambient light detection sensor, and reduces a module packaging process, simplifies the structural design, and greatly saves the cost of the device. Occupying volume, it provides a basis for further integration and miniaturization of handheld electronic devices, which ultimately reduces production costs and improves the reliability of electronic products.

A detailed description will be given below in conjunction with the accompanying drawings.

Embodiment one

Referring to FIG. 2, the present embodiment provides a handheld electronic device, including an image sensor module 100 and a display screen 200, wherein: the image sensor 100 includes:

Circuit substrate 110;

An image sensor 120 located on the circuit substrate 110 and electrically connected to the circuit substrate 110, the image sensor 120 includes a photosensitive unit 121;

An optical lens 130, located above the image sensor 120, and the optical center of the optical lens 130 is on the same axis as the photosensitive center of the photosensitive unit 121;

The light emitting module 150 is located on the circuit substrate 110 around the image sensor 120, and includes an infrared light emitting diode 151 for emitting infrared light;

A bandpass filter 140, located above the optical lens 130, is used to transmit visible light in the infrared light and ambient light into the optical lens 130;

The photosensitive unit 121 is used to detect the visible light and the infrared light, convert the obtained light signal into an electrical signal and send it to the circuit substrate 110 .

The display screen 200 includes a backlight 210, the backlight 210 is connected to the circuit substrate 110, the circuit substrate 110 adjusts the brightness of the backlight 210 according to the electrical signal corresponding to the visible light, and adjusts the brightness of the backlight 210 according to the infrared The electric signal corresponding to the light controls to turn off the backlight source 210 .

In this embodiment, an infrared light-emitting diode 151 is added to the light-emitting module 150 around the image sensor 120. The infrared light-emitting diode 151 emits infrared light. The infrared light is reflected into the band-pass filter 140, and the band-pass filter 140 allows the visible light in the ambient light and the infrared light to transmit into the optical lens 130 below it at the same time. After the light is converged by the optical lens 130, the image sensor The photosensitive unit 121 in 120 detects the visible light and the infrared light, and converts the obtained two kinds of optical signals into corresponding electrical signals and sends them to the circuit substrate 110. On the one hand, the circuit substrate 110 analyzes the infrared light The electrical signal can determine the distance between the handheld electronic device and the face, and then determine whether to turn off the backlight 210, thereby realizing the function of the infrared proximity sensor; on the other hand, the circuit substrate 110 can determine the The brightness of the ambient light is obtained, and then it is judged whether the brightness of the backlight source 210 needs to be adjusted, thereby realizing the function of the ambient light detection sensor.

Since only the infrared light-emitting diode 151 is added structurally, the structural design is relatively simple, and the volume of the infrared light-emitting diode 151 is almost negligible compared with the volume of the three-in-one light-sensing module, thereby saving a lot of volume and reducing production cost.

Specifically, the handheld electronic device may be a mobile phone or a tablet computer, or other handheld electronic devices that can be placed on the face for communication, all of which are within the protection scope of the present invention.

Preferably, the light emitting module 150 may also include one or more visible light emitting diodes (not shown in the figure) for emitting visible light, such as red light, green light, and yellow light. One or more of visible light such as blue light can serve as an indicator light. It should be noted that the visible light emitted by the visible light emitting diode will also be detected by the photosensitive unit 121 through the bandpass filter 140 and the optical lens 130 in sequence.

The wavelength range of the infrared light emitting diode 151 may include: 780nm~2500nm, preferably, the wavelength corresponding to the infrared light emitting diode 151 is a single frequency wavelength, such as: 850nm, 910nm or 940nm. In practice, the emission wavelength of the infrared light-emitting diode 151 is mostly in the wavelength band with λ1 as the center wavelength, such as: λ1-Δλ1˜λ1+Δλ1.

When the infrared light emitted by the infrared LED 151 is divergent light, only part of the infrared light can reach the surface of the bandpass filter 140 .

The bandpass wavelengths of the bandpass filter 140 include visible light bands and infrared light bands corresponding to the infrared light emitting diodes 151 . Wherein, the wavelength band of the infrared light corresponding to the bandpass filter 140 may be wider than, equal to or narrower than that of the infrared light emitting diode 151 . Specifically, the band-pass wavelengths of the band-pass filter 140 corresponding to infrared light include: λ2-Δλ2˜λ2+Δλ2, and 0≤|λ2-λ1|≤Δλ1+Δλ2.

In order to ensure that the photosensitive unit 121 can detect effective infrared light, the transmittance range of the infrared light emitted by the infrared light-emitting diode 151 passing through the band-pass filter 140 in this embodiment includes: 2%~98%, such as: 2%, 15%, 45%, 70% or 98%, etc.

It should be noted that the infrared light in the ambient light may also pass through the band-pass filter 140, but since its intensity can be controlled by the infrared pass rate, its intensity can be controlled within a small range in the end. Therefore it can be ignored.

In this embodiment, the light-emitting module 150 can be arranged in any direction around the image sensor 120. Since the intensity of infrared light emitted by the infrared light-emitting diode 151 is limited, in order to ensure that the intensity of the infrared light detected by the photosensitive unit 121 will not be too small, the When the infrared light-emitting diode 151 and the band-pass filter 140 are projected onto the same horizontal plane, the distance range between the infrared light-emitting diode 151 and the band-pass filter 140 may include: 0.05cm~3cm, such as: 0.05cm, 0.5cm cm, 1.2cm, 2cm or 3cm etc.

The part corresponding to the visible light band in the bandpass filter 140 is the same as the prior art, and will not be repeated here.

The optical lens 130 is used to converge the light so that the photosensitive unit 121 acquires more light signals, and its specific structure is well known to those skilled in the art, and will not be repeated here.

In order to make the light passing through the optical lens 130 be better received by the photosensitive unit 121 of the image sensor 120, and effectively convert the optical signal into an electrical signal, the optical center of each optical lens 120 is aligned with the photosensitive unit 121 of the corresponding photosensitive unit 121. centers on the same axis.

The image sensor 120 can be either a CMOS image sensor or a CCD image sensor, which does not limit the protection scope of the present utility model.

The image sensor 120 in this embodiment is not only used for image detection, but also used for detecting visible light in the infrared light and ambient light. Specifically, one or more photosensitive units 121 may be disposed in the pixel area of the image sensor 120 . When there are multiple photosensitive units 121, the photosensitive units 121 may be arranged in an array to improve receiving efficiency. After the photosensitive unit 121 detects the visible light and the infrared light, it converts the acquired light signal into a corresponding electrical signal and sends it to the circuit substrate 110, and the circuit substrate 110 performs subsequent signal processing.

The display screen 200 is a touch display screen, which can be either an LCD display screen or an LED display screen.

The backlight source 210 in the display screen 200 may be an edge-lit type or a direct-lit type.

It should be noted that, in other embodiments of the present utility model, the display screen 200 may also be an ordinary non-touch display screen. At this time, when the user communicates with a handheld electronic device, by turning off the backlight in time, Can play the role of saving electric energy.

The circuit substrate 110 may be a flexible circuit board (FPC), which receives the electrical signal sent by the photosensitive unit 121 .

On the one hand, the circuit substrate 110 obtains the intensity of the infrared light received by the photosensitive unit 121 according to the electrical signal corresponding to the infrared light, and when the intensity of the infrared light is less than or equal to a preset threshold, it is judged Knowing that the user is talking, the circuit substrate 110 controls to turn off the backlight 210 to avoid misoperation and save power, thereby realizing the function of an infrared proximity sensor.

On the other hand, the circuit substrate 110 obtains the intensity of the visible light received by the photosensitive unit 121 according to the electrical signal corresponding to the visible light, and when the intensity of the visible light is less than or equal to the set lower limit value, it is determined that Knowing that the ambient light is too weak, the circuit substrate 110 will automatically increase the brightness of the backlight source 210 to be more conducive to the observation of the human eye and can protect the human eye; when the intensity of the visible light is greater than or equal to the set upper limit value, it is judged that Knowing that the ambient light is strong, the circuit substrate 110 will automatically reduce the brightness of the backlight 210 to further save power.

The preset threshold, the set lower limit and the set upper limit may be fixed values, or may be modified by the user at any time.

Without changing the functions of the handheld electronic device, this embodiment reduces the number of electronic devices, saves space, reduces the difficulty of structural design, simplifies manufacturing process steps, and ultimately reduces production costs.

Embodiment two

Referring to Fig. 3, the present embodiment provides a handheld electronic device. Compared with Fig. 2, the bandpass filter 140 is located on the image sensor 120, the optical lens 130 is located on the bandpass filter 140, and the rest All are identical with embodiment one.

In this embodiment, all the light that enters the surface of the optical lens 130 is first collected, and then the band-pass filter 140 is used to filter and remove the infrared light emitted by the infrared light-emitting diode 151 and the light other than visible light in the ambient light. Finally, the light signal detected by the photosensitive unit 121 is the same as that in the first embodiment.

This embodiment also omits the three-in-one light sensing module, and at the same time integrates the functions of the infrared proximity sensor and the ambient light detection sensor into the image sensor module, realizing a high degree of integration in function and design, and simplifying the structural design Difficulty increases the reliability of electronic products, reduces the occupied volume of devices, and ultimately reduces production costs.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the utility model, can use the method and technical content disclosed above to make many possible changes and modifications to the technical solution of the utility model, or modify it into an equivalent change, etc. effective example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical proposal of the present invention.

Claims (11)

1. an imageing sensor module, is characterized in that, comprising:

Circuit base plate;

Be positioned on described circuit base plate and the imageing sensor that is electrically connected to described circuit base plate, described imageing sensor comprises photosensitive unit;

Optical lens be positioned at above described imageing sensor, and the sensitivity centre of the optical centre of optical lens and described photosensitive unit is on same axis;

Light emitting module is positioned on described imageing sensor circuit base plate on every side, comprises infrarede emitting diode, is used for the emission infrared light;

Band pass filter above described optical lens or between described optical lens and described imageing sensor, is used for making the visible transmission of described infrared light and surround lighting enter described optical lens;

Described photosensitive unit is for detection of described visible light and described infrared light, sends to circuit base plate after the light signal that obtains is converted to the signal of telecommunication.

2. imageing sensor module as claimed in claim 1, is characterized in that, the wave-length coverage of described infrared light comprises: 780nm ~ 2500nm.

3. imageing sensor module as claimed in claim 2, is characterized in that, described infrared light wavelength is 850nm or 910nm or 940nm.

4. imageing sensor module as claimed in claim 1, is characterized in that, described light emitting module also comprises visible light emitting diode, is used for the emission visible light.

5. imageing sensor module as claimed in claim 1, is characterized in that, described imageing sensor is cmos image sensor or ccd image sensor.

6. imageing sensor module as claimed in claim 1, it is characterized in that, the emission wavelength of described infrarede emitting diode comprises: λ 1-Δ λ 1 ~ λ 1+ Δ λ 1, and the logical wavelength of the band of described band pass filter comprises: λ 2-Δ λ 2 ~ λ 2+ Δ λ 2, and 0≤| λ 2-λ 1|≤Δ λ 1+ Δ λ 2.

7. imageing sensor module as described in claim 1 or 6, is characterized in that, the infrared light of described infrarede emitting diode emission comprises by the range of transmittance of described band pass filter: 2% ~ 98%.

8. imageing sensor module as claimed in claim 1, is characterized in that, the distance range between described infrarede emitting diode and described band pass filter comprises: 0.05cm ~ 3cm.

9. portable electric device, it is characterized in that, comprise imageing sensor module as described in any one in claim 1 to 7 and display screen, described display screen comprises backlight, described backlight connects described circuit base plate, described circuit base plate is regulated the brightness of described backlight according to the signal of telecommunication corresponding with described visible light, and described backlight is closed in the signal of telecommunication corresponding according to described infrared light control.

10. portable electric device as claimed in claim 9, is characterized in that, when described infrared light intensity was less than or equal to predetermined threshold value, described circuit base plate was controlled and closed described backlight.

11. portable electric device as claimed in claim 9 is characterized in that, described portable electric device is mobile phone or flat computer.

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