Digital detection and display integrated low-light movement and low-light night vision device

Abstract

The invention discloses a digital detection and display integrated low-light movement and a low-light night vision device. The low-light movement comprises a low-light image sensor, a digital image processing circuit module, a micro display screen and a PCB, the low-light image sensor is welded on the front surface of the PCB; the digital image processing circuit module is welded on the back surface of the PCB and is connected with the low-light image sensor through internal wiring of the PCB; the micro display screen is mounted on the back surface of the PCB and is connected with the digital image processing circuit module through internal wiring of the PCB; the low-light image sensor is used for receiving an optical signal in an observation environment and converting the optical signal into a digital signal; the digital image processing circuit module is used for processing the digital signal and then outputting a digital video signal to the micro display screen; the miniature display screen is used for converting the digital video signals into optical signals and outputting the optical signals. The low-light-level movement provided by the scheme of the invention can better meet the application requirements of miniaturization, light weight and digitization.

Description

Technical Field

[0001] The invention relates to the technical field of low-light-level night vision, and in particular to a low-light-level night vision device with digital detection and display integration. Background Art

[0002] Low-light-level night vision devices are widely used in nighttime assisted driving of vehicles, nighttime aiming of guns, and target observation, detection, search and rescue, and security in nighttime conditions. At present, the core components of low-light-level night vision devices are mainly divided into two categories: low-light-level image intensifier tubes and digital low-light-level night vision movements. The working principle of the digital low-light-level movement is: the movement collects light signals through low-light-level image sensors and converts them into digital signals, which are then sent to the micro display screen for display after passing through the image processing module.

[0003] The digital low-light night vision movements currently available on the market are usually composed of image sensors and driver boards, image processing boards, micro display interface boards or an additional function expansion board. Among them, image sensors generally use commercial CMOS image sensors, whose pixel size is generally not more than 4um and whose resolution is generally greater than 1920×1080. This small-pixel high-resolution image sensor cannot meet the high sensitivity requirements under dark light conditions and generally needs to be paired with an infrared fill light, but turning on the fill light will expose the user. In addition, because the core of the image processor is a commercial SOC (System on Chip) or FPGA (Field Programmable Gate Array), the commercial SOC is not designed and optimized for this usage scenario, and the FPGA is limited by power consumption and cannot achieve a high frame rate. Therefore, the frame rate of the traditional digital low-light night vision movement is generally not higher than 50 frames. This low frame rate will cause high latency, which will make the user feel that the image is lagging, and there will be dizziness when wearing it for a long time, especially when the head-mounted application has a poor experience. At the same time, the traditional digital low-light movement structure is generally composed of 3 to 4 circuit boards, which means that the digital low-light night vision movement has no advantages in terms of lightweight and miniaturization. Summary of the invention

[0004] The embodiment of the present invention provides a digital detection and display integrated low-light level movement and a low-light level night vision device, so as to improve the night vision performance of the low-light level night vision movement and meet the application requirements of miniaturized and lightweight low-light level night vision devices.

[0005] The embodiment of the present invention provides the following technical solutions:

[0006] On the one hand, an embodiment of the present invention provides a digital detection and display integrated low-light movement, comprising: a low-light image sensor, a digital image processing circuit module, a micro display screen, and a PCB; the low-light image sensor is welded on the front side of the PCB; the digital image processing circuit module is welded on the back side of the PCB and connected to the low-light image sensor through internal wiring of the PCB; the micro display screen is mounted on the back side of the PCB and connected to the digital image processing circuit module through internal wiring of the PCB;

[0007] The low-light image sensor is used to receive light signals in the observation environment and convert them into digital signals;

[0008] The digital image processing circuit module is used to process the digital signal and then output a digital video signal to the micro display screen;

[0009] The micro display screen is used to convert the digital video signal into an optical signal for output.

[0010] Optionally, the low-light level image sensor is a low-illuminance back-illuminated CMOS image sensor.

[0011] Optionally, the pixel size of the CMOS image sensor is greater than or equal to 8 μm and less than or equal to 18 μm, the spectral response band is greater than or equal to 400 nm and less than or equal to 1100 nm, and the resolution is greater than or equal to 800×600.

[0012] Optionally, the minimum operating illumination of the CMOS image sensor is 1×10 -4 lux, the maximum operating frame rate is 120Hz, and the dynamic range of the low-light image sensor is 110dB.

[0013] Optionally, the low-light level image sensor is soldered on the front side of the PCB by SMT, and the digital image processing circuit module is soldered on the back side of the PCB by SMT.

[0014] Optionally, the micro display screen is mounted on the back side of the PCB via a board-to-board connector or an FPC cable.

[0015] Optionally, the PCB is a circular plate with a diameter not greater than 34 mm and a thickness not greater than 1.4 mm.

[0016] Optionally, the micro-light core has an outer dimension no greater than The weight shall not exceed 10g.

[0017] Optionally, the micro display screen includes any one of the following: an OLED micro display screen, an LCD micro display screen, or an LCOS micro display screen.

[0018] Optionally, a pixel size of the OLED micro display screen is greater than or equal to 7.88 μm and less than or equal to 15 μm, and a resolution is greater than or equal to 800×600.

[0019] Optionally, the digital image processing circuit module includes: a digital image processing chip, a storage module connected to the digital image processing chip, and a display interface module;

[0020] The digital image processing chip is used to control the low-light image sensor to collect images, perform storage control and calculation processing on the digital signal output by the low-light image sensor, and output the digital video signal through the display interface module;

[0021] The storage module is used to store the image data processed by the digital image processing chip and the firmware program of the digital low-light movement.

[0022] Optionally, the display interface module includes any one or more of the following interface circuits: a DVP interface circuit, a PAL interface circuit, and a micro display screen display interface circuit.

[0023] Optionally, the digital image processing circuit module further includes: a control and communication interface module, connected to the digital image processing chip and used for connecting to external devices.

[0024] Optionally, the control and communication interface module includes any one or more of the following interface circuits: a UART interface circuit, an IIC interface circuit, a button and rotary encoder interface circuit.

[0025] Optionally, the external device includes any one or more of the following: a button, a rotary encoder, an ambient light sensor, a fill light, and an electronic compass.

[0026] Optionally, the digital image processing chip is packaged as a BGA package, the package size is greater than or equal to 12mm×12mm and less than or equal to 15mm×15mm, the BGA solder ball spacing is greater than or equal to 0.72mm and less than or equal to 0.8mm, the supported resolution is greater than or equal to 800×600 and less than or equal to 1920×1080, and the frame rate is greater than or equal to 25Hz and less than or equal to 120Hz.

[0027] On the other hand, an embodiment of the present invention further provides a low-light-level night vision device, comprising the digital detection and display integrated low-light-level movement.

[0028] The digital detection and display integrated low-light movement provided in the embodiment of the present invention has the low-light image sensor welded on the front side of the PCB, the digital image processing circuit module welded on the back side of the PCB, and the micro display screen directly mounted on the back side of the PCB, so that these modules can be integrated on a single PCB, thereby greatly simplifying the structure of the low-light movement, and further reducing the weight and volume of the low-light night vision device, so that it can better meet the application requirements of miniaturization, lightweight and digitalization, and enhance the user experience.

[0029] Furthermore, by selecting a low-light back-illuminated low-light image sensor, designing the pixel size and other parameters of the low-light image sensor, and cooperating with a high-performance dedicated digital image processing chip, the digital detection and display integrated low-light imaging provided by the embodiment of the present invention has the characteristics of high sensitivity, high frame rate and low latency, and can achieve 1×10 -4 It operates at a maximum frame rate of 120Hz under lux illumination.

[0030] Furthermore, by simplifying the movement circuit design and highly integrated PCB design, the back-illuminated low-light image sensor, digital image processing circuit module and micro display screen are integrated into one The circular PCB has a movement weight of no more than 10g and an object-image focal plane distance of no more than 9.4mm, which greatly reduces the size and weight of the night vision movement and achieves high integration and ultra-thinness of the low-light night vision movement, making it especially suitable for head-mounted, handheld and sighting night vision devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a clearer understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 It is a structural block diagram of a digital detection and display integrated micro-light movement provided by an embodiment of the present invention;

[0033] Figure 2 and Figure 3 It is a schematic diagram of explosion in two different directions of a digital detection and display integrated micro-light movement provided by an embodiment of the present invention;

[0034] Figure 4 It is a structural schematic diagram of a digital image processing circuit module in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The principle and spirit of the present invention will be described below with reference to the exemplary embodiments shown in the accompanying drawings. It should be understood that these embodiments are described only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way.

[0036] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0040] The embodiment of the present invention provides a digital detection and display integrated low-light movement, which has the technical characteristics of lightweight, ultra-thin, high sensitivity, high frame rate and low latency, and is particularly suitable for night vision equipment such as head-mounted, handheld and sighting devices.

[0041] The technical solutions of the present invention are further described in detail below in conjunction with specific embodiments, but the present invention is not limited to the technical solutions of the following embodiments.

[0042] Figure 1 It is a structural block diagram of a digital detection and display integrated micro-light movement provided by an embodiment of the present invention; Figure 2 and Figure 3 Schematic diagrams of explosions of the digital detection and display integrated micro-light movement structure based on different directions are shown respectively.

[0043] Also refer to Figure 1 , Figure 2 and Figure 3The digital detection and display integrated low-light movement 100 includes four parts: a low-light image sensor 1, a digital image processing circuit module 2, a micro display screen 3 and a PCB 4.

[0044] The entire low-light movement 100 adopts a highly integrated design scheme, integrating the low-light image sensor 1, the digital image processing circuit module 2 and the micro display screen 3 on a PCB 4, which can greatly simplify the structure of the low-light movement and facilitate miniaturization and lightweighting.

[0045] In some embodiments, the low-light image sensor 1 can be soldered on the front side of the PCB 4 using SMT (Surface Mounted Technology), the digital image processing circuit module 2 can also be soldered on the back side of the PCB 4 using SMT technology, and the micro display screen 3 can be installed on the back side of the PCB 4 through a board-to-board connector 31 or an FPC (Flexible Printed Circuit) cable.

[0046] The above-mentioned low-light image sensor 1, digital image processing circuit module 2, and micro display screen 3 can be connected through internal wiring of the PCB to achieve signal transmission between different modules.

[0047] In an embodiment of the present invention, the low-light image sensor 1 is used to receive light signals in an observation environment (such as a low-light environment); the digital image processing circuit module 2 is used to process the digital signal and output a digital video signal to the micro display screen; the micro display screen 3 is used to convert the digital video signal into a light signal output.

[0048] The selection of the low-light image sensor 1 is related to the night vision performance of the night vision movement. The low-light image sensor 1 in this embodiment can be a low-illuminance back-illuminated CMOS image sensor. In combination with the structural design of the low-light movement 100 in the embodiment of the present invention, the relevant parameters of the CMOS image sensor are designed and verified, so that it can have the characteristics of high sensitivity and high dynamic range. Compared with the front-illuminated (FSI) photosensing method, the back-illuminated structure can significantly improve the photosensitivity efficiency, and also suppress the possibility of photosensitivity degradation caused by changes in the incident angle.

[0049] In some embodiments, the pixel size of the low-illuminance back-illuminated CMOS image sensor is greater than or equal to 8 μm and less than or equal to 18 μm. By increasing the pixel size, a larger photosensitive area can be obtained, for example, the photosensitive area of ​​an 8 μm pixel is 4 times that of a 4 μm pixel, and the photosensitive area of ​​an 18 μm pixel is 20 times that of a 4 μm pixel.

[0050] In some embodiments, a spectral response band of the low-illuminance back-illuminated CMOS image sensor is greater than or equal to 400 nm and less than or equal to 1100 nm.

[0051] In some embodiments, the resolution of the low-illuminance back-illuminated CMOS image sensor is greater than or equal to 800×600.

[0052] In some embodiments, the optical size of the low-illuminance back-illuminated CMOS image sensor can be designed to be 1 inch, and the device height is 2.3 mm.

[0053] In some embodiments, the effective pixel array of the low-illuminance back-illuminated CMOS image sensor can be designed to be 805×607, and the maximum frame rate can reach 120 Hz.

[0054] In the embodiment of the present invention, the micro display screen 3 can adopt any one of the following: OLED (Organic Light-Emitting Diode, organic electric laser display) micro display screen, LCD (Liquid Crystal Display, liquid crystal display) micro display screen, LCOS (Liquid Crystal On Silicon, silicon-based liquid crystal or single-crystal silicon reflective liquid crystal) micro display screen.

[0055] For an OLED micro display screen, its pixel size may be, for example, greater than or equal to 7.88 μm and less than or equal to 15 μm, and the resolution may be greater than or equal to 800×600.

[0056] like Figure 4 FIG. 1 is a schematic diagram of a structure of a digital image processing circuit module in an embodiment of the present invention.

[0057] The digital image processing circuit module 2 includes a digital image processing chip 21 , a storage module 23 connected to the digital image processing chip 21 , and a display interface module 24 connected to the digital image processing chip 21 .

[0058] In some embodiments, the digital image processing circuit module 2 may further include a power supply module 25 to provide operating voltage for the above modules, and further may have functions such as reverse connection protection and overvoltage protection of the power supply battery.

[0059] The digital image processing chip 21 is the core of the digital image processing circuit module 2 and is used to control Figure 1 The low-light-level image sensor 1 performs image acquisition, performs storage control and operation processing on the digital signal output by the low-light-level image sensor 1 , and outputs the digital video signal through the display interface module 24 .

[0060] In some embodiments, the digital image processing chip 21 can adopt a dedicated digital image processing chip, such as a BGA (Ball Grid Array) package, with a package size greater than or equal to 12 mm×12 mm and less than or equal to 15 mm×15 mm, a BGA solder ball pitch greater than or equal to 0.72 mm and less than or equal to 0.8 mm, a supported resolution greater than or equal to 800×600 and less than or equal to 1920×1080, and a frame rate greater than or equal to 25 Hz and less than or equal to 120 Hz.

[0061] The display interface module 24 is used to send the video signal processed by the digital image processing chip 21 to the display device for display. The display interface module includes but is not limited to any one or more of the following interface circuits: DVP (Digital Video Port) interface circuit, PAL (Phase Alteration Line) interface circuit, micro display screen display interface circuit, etc.

[0062] The low-light movement provided in the embodiment of the present invention can be connected to different display devices through the above-mentioned different display interfaces. The rich display interface design enables the low-light movement provided in the embodiment of the present invention to not only directly drive the OLED micro display screen, but also selectively output the low-light image to other image receiving devices in the form of digital video or analog video, thereby expanding the application scenarios of the low-light night vision movement. For example, in a non-limiting embodiment, the micro display screen 3 uses a plug-in silicon-based OLED micro display screen, the display screen includes a connector with a height of 4.7mm, wherein the connector height is 2.3mm, the display screen resolution is 800×600, the pixel size is 15μm×15μm, and it supports 16 / 24bit digital video signal input, with the characteristics of low power consumption and high resolution. The low-light movement in the embodiment of the present invention initializes the OLED micro display screen through the IIC bus of the micro display screen interface module, and then outputs 24bit parallel data to the OLED micro display screen according to the line field protocol. During the display process, the brightness, contrast and other parameters of the OLED micro display screen can be adjusted through the IIC configuration register.

[0063] The above-mentioned storage module 23 is used to store the image data processed by the digital image processing chip 21 and the firmware program of the digital low-light movement. For example, it may include but is not limited to any one or more of the following storage circuits: DDR (Double Data Rate) SDRAM (synchronous dynamic random-access memory) memory, SPI (Serial Peripheral Interface) Flash memory, etc.

[0064] In some embodiments, the digital image processing circuit module 2 may further include a control and communication interface module 22 connected to the digital image processing chip 21 .

[0065] The control and communication interface module 22 may include but is not limited to any one or more of the following interface circuits: UART (Universal Asynchronous Receiver Transmitter) interface circuit, IIC (Inter-Integrated Circuit) interface circuit, button and rotary encoder interface circuit, etc., and the external devices that can be connected may include but are not limited to any one or more of the following: buttons, rotary encoders, ambient light sensors, fill lights and electronic compasses, etc.

[0066] By setting up a variety of control and communication interfaces, it can cooperate with the digital image processing chip 21, which greatly facilitates the user to control the low-light movement and realize functions such as ambient light detection, electronic compass and fill light.

[0067] The digital detection and display integrated micro-light core provided by the embodiment of the present invention adopts a highly integrated and ultra-thin design solution to integrate image detection, processing and display modules into one The circular PCB makes the net weight of the movement only 10g, and the distance between the optical axis and the focal plane of the image is only 9.2mm; the use of a high-performance low-light back-illuminated CMOS image sensor, in conjunction with a dedicated digital image processing chip, can further optimize the night vision performance of the low-light movement of the embodiment of the present invention. For example, it can operate at a maximum frame rate of 120Hz under an illumination of 1×10-4lux, with a delay of less than 10ms, and has the characteristics of high sensitivity, wide dynamic range, high frame rate and low latency. Moreover, the rich interface module design can make the low-light movement provided by the embodiment of the present invention have the characteristics of digitization and shared data, and can realize the interconnection of the low-light movement and different devices, with a wider range of application scenarios.

[0068] Correspondingly, an embodiment of the present invention further provides a low-light-level night vision device, comprising the above-mentioned digital detection and display integrated low-light-level movement.

[0069] The digital detection and display integrated low-light level movement and low-light level night vision device provided by the embodiments of the present invention can be better applied to head-mounted, hand-held, sighting and other night vision devices that are sensitive to weight and volume.

[0070] It should be noted that the “plurality” appearing in the embodiments of the present invention refers to two or more than two.

[0071] The first, second, etc. descriptions appearing in the embodiments of the present invention are only used for illustration and distinction of the description objects. There is no order, nor does it indicate any special limitation on the number of devices in the embodiments of the present invention, and cannot constitute any limitation on the embodiments of the present invention.

[0072] In the several embodiments provided by the present invention, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic; for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation; for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0073] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A digital detection and display integrated micro-light movement, characterized in that: include: A low-light image sensor, a digital image processing circuit module, a micro display screen, and a PCB; the low-light image sensor is welded on the front side of the PCB; the digital image processing circuit module is welded on the back side of the PCB and connected to the low-light image sensor through internal wiring of the PCB; the micro display screen is mounted on the back side of the PCB and connected to the digital image processing circuit module through internal wiring of the PCB; The low-light image sensor is used to receive light signals in the observation environment and convert them into digital signals; The digital image processing circuit module is used to process the digital signal and then output a digital video signal to the micro display screen; The micro display screen is used to convert the digital video signal into an optical signal for output.

2. The digital detection and display integrated micro-light movement according to claim 1, characterized in that: The low-light image sensor is a low-illumination back-illuminated CMOS image sensor.

3. The digital detection and display integrated micro-light movement according to claim 2, characterized in that: The pixel size of the CMOS image sensor is greater than or equal to 8 μm and less than or equal to 18 μm, the spectral response band is greater than or equal to 400 nm and less than or equal to 1100 nm, and the resolution is greater than or equal to 800×600.

4. The digital detection and display integrated micro-light movement according to claim 3, characterized in that: The minimum operating illumination of the CMOS image sensor is 1×10 -4 lux, the maximum operating frame rate is 120Hz, and the dynamic range of the low-light image sensor is 110dB.

5. The digital detection and display integrated micro-light movement according to claim 3, characterized in that: The low-light image sensor is soldered on the front side of the PCB by SMT, and the digital image processing circuit module is soldered on the back side of the PCB by SMT.

6. The digital detection and display integrated micro-light movement according to claim 1, characterized in that: The micro display screen is mounted on the back side of the PCB via a board-to-board connector or an FPC cable.

7. The digital detection and display integrated micro-light movement according to claim 1, characterized in that: The PCB is a circular plate with a diameter not greater than 34 mm and a thickness not greater than 1.4 mm.

8. The digital detection and display integrated micro-light movement according to claim 1, characterized in that: The overall dimensions of the micro-light movement are not greater than The weight shall not exceed 10g.

9. The digital detection and display integrated micro-light movement according to claim 1, characterized in that: The micro display screen includes any one of the following: an OLED micro display screen, an LCD micro display screen, and an LCOS micro display screen.

10. The digital detection and display integrated micro-light movement according to claim 9, characterized in that: The pixel size of the OLED micro display screen is greater than or equal to 7.88 μm and less than or equal to 15 μm, and the resolution is greater than or equal to 800×600.

11. The digital detection and display integrated micro-light movement according to any one of claims 1 to 10, characterized in that: The digital image processing circuit module includes: a digital image processing chip, a storage module connected to the digital image processing chip, and a display interface module; The digital image processing chip is used to control the low-light image sensor to collect images, perform storage control and calculation processing on the digital signal output by the low-light image sensor, and output the digital video signal through the display interface module; The storage module is used to store the image data processed by the digital image processing chip and the firmware program of the digital low-light movement.

12. The digital detection and display integrated micro-light movement according to claim 11, characterized in that: The display interface module includes any one or more of the following interface circuits: a DVP interface circuit, a PAL interface circuit, and a micro display screen display interface circuit.

13. The digital detection and display integrated micro-light movement according to claim 11, characterized in that: The digital image processing circuit module also includes: The control and communication interface module is connected to the digital image processing chip and is used to connect to external devices.

14. The digital detection and display integrated micro-light movement according to claim 13, characterized in that: The control and communication interface module includes any one or more of the following interface circuits: UART interface circuit, IIC interface circuit, key and rotary encoder interface circuit.

15. The digital detection and display integrated micro-light movement according to claim 13, characterized in that: The external device includes any one or more of the following: a button, a rotary encoder, an ambient light sensor, a fill light, and an electronic compass.

16. The digital detection and display integrated micro-light movement according to claim 11, characterized in that: The digital image processing chip is packaged as a BGA package, the package size is greater than or equal to 12mm×12mm and less than or equal to 15mm×15mm, the BGA solder ball spacing is greater than or equal to 0.72mm and less than or equal to 0.8mm, the supported resolution is greater than or equal to 800×600 and less than or equal to 1920×1080, and the frame rate is greater than or equal to 25Hz and less than or equal to 120Hz.

17. A low-light-level night vision device, characterized in that: It comprises a digital detection and display integrated micro-light movement as described in any one of claims 1 to 16.

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