CN216284883U

CN216284883U - Optical detection device for MiniLED response time

Info

Publication number: CN216284883U
Application number: CN202122379509.XU
Authority: CN
Inventors: 郑培权; 林志阳; 廖明燕; 庄先焕; 赖世人; 张军刚; 曾朝家; 张志星
Original assignee: Xiamen Teyi Technology Co ltd
Current assignee: Xiamen Teyi Technology Co ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-04-12
Anticipated expiration: 2031-09-29

Abstract

The utility model discloses an optical detection device for MiniLED response time, which mainly comprises a photoelectric detection module, a light path structure, a photoelectric signal conversion module, an operational amplifier module, a data acquisition module, a USB communication module and a power management module; the photoelectric signal conversion module and the photoelectric detection module are both connected with the light path structure; the operational amplifier amplification module is connected with the photoelectric signal conversion module; the data acquisition module is connected with the operational amplifier module; the USB communication module is connected with the photoelectric detection module and the data acquisition module; the power supply management module is used for distributing and managing energy resources of the whole detection device. The detection device has the advantages of simple structure, convenience in use, lightness and portability, and the precision requirement can reach nanosecond level; in addition, this detection device adopts detachable hookup, can assemble and carry out product test on other boards, improves the production efficiency of enterprise greatly, reduces unnecessary manpower extravagant.

Description

Optical detection device for MiniLED response time

Technical Field

The utility model relates to the technical field of display screen detection equipment, in particular to an optical detection device for MiniLED response time.

Background

Display technology is the most important branch of human-computer interaction, and from materials, panels to display applications, there are many excellent enterprises that cultivate for a long time in this field. The upgrading and upgrading speed of the display technology is very fast, and for decades, the CRT display has moved back to the river and lake, the liquid crystal has been once in the world, the OLED is now in the spotlight, and the new directions such as MiniLED and MicroLED are also very attractive. The sub-millimeter light emitting diode (MiniLED) is lighter, thinner and more energy-saving due to its characteristics of high resolution, high brightness, high contrast and wide color gamut, and has gradually become a new focus of attention in the display screen industry.

The length of the response time is an important factor for evaluating the quality of a display screen product, the impression experience of a user can be seriously influenced, and the longer the response time is, the worse the impression experience of the user is. According to the response time criteria specified by the Video Electronics Standards Association (VESA), the initial brightness differs from the target brightness by ninety percent of the arrival time. Therefore, in the actual testing process, we only need to measure the rising time T1 for MiniLED to change from 10% to 90% from one brightness level H to another brightness level L and the falling time T2 for MiniLED to change from 90% to 10% from the brightness level L, and add T1 and T2 to obtain the desired response time. Although the testing principle is simple, the testing device for the response time of the MiniLED on the market is less, and the testing device is not good in precision.

Disclosure of Invention

In view of the defects of the prior art, the utility model aims to provide an optical detection device for MiniLED response time, which is simple and convenient to operate, has high precision and is suitable for various occasions.

The technical scheme adopted by the utility model for solving the technical problem is as follows: the utility model provides an optical detection device for MiniLED response time, which mainly comprises a photoelectric detection module, a light path structure, a photoelectric signal conversion module, an operational amplifier module, a data acquisition module, a USB communication module and a power management module; the photoelectric signal conversion module and the photoelectric detection module are both connected with the light path structure; the operational amplifier amplification module is connected with the photoelectric signal conversion module; the data acquisition module is connected with the operational amplifier amplification module; the USB communication module is connected with the photoelectric detection module and the data acquisition module; and the power supply management module is used for distributing and managing energy resources of the whole detection device.

Furthermore, the photoelectric detection module mainly comprises an industrial lens and a positioning camera, and the photoelectric detection module has the functions of capturing image signals and returning the detected image signals to an upper computer, so that a tester can conveniently observe and adjust the distance, the positioning accuracy is ensured, and the preparation work is prepared for the MiniLED response time. The industrial lens is preferably an ultra-micro-distance industrial lens, has the characteristics of high resolution, high contrast, low aberration, accurate color reduction and the like, and can more clearly show the details and the texture of a shot object, namely, an image signal can be clearer and smoother, errors are reduced, and the detection precision is improved.

Further, the optical path structure comprises a micro T-stage, a lens sleeve and an optical lens group; the main function of the optical path structure is to ensure the stability of the light incoming quantity, ensure the transmission of signals to be uninterrupted, and reflect redundant image signals to the positioning camera through the optical lens group, so that a tester can debug the lens to capture clear image information. The lens sleeve is a reflector lens sleeve; generally, due to the product specification of MiniLED, the light emitting diameter is about 0.1mm, light enters from the industrial lens and reaches the reflector, and the reflector has a small hole of 0.3mm, and the light can completely enter the lens sleeve and be captured by the positioning camera and the photoelectric signal conversion module according to the principle of small hole imaging.

Furthermore, the photoelectric signal conversion module mainly comprises a photomultiplier, and the photomultiplier is an optical detection device with extremely high sensitivity and extremely fast response time, can convert photoelectric signals in time and ensures the timeliness of data transmission; and the converted electric signal is amplified by the operational amplifier module and then transmitted to the data acquisition module. The response time of the photomultiplier is preferably 2.2 nanoseconds, that is to say a sampling frequency of approximately 450 MHZ. And because of the product characteristics of miniLED, its response time is about 100 ns. According to shannon's sampling theorem, if it is required to ensure the accuracy and clarity of the acquired signal, the sampling frequency is more than or equal to twice of the signal frequency. In the application, the acquisition frequency is about 450MHz, the signal frequency is about 10MHz, and the detection device completely meets the theoretical requirement, so the detection device can reach the accuracy requirement of nanosecond level.

Furthermore, the operational amplifier module amplifies the output signal of the photoelectric signal conversion module, so that data acquisition and processing are facilitated; the main control chip of the operational amplifier amplification module is AD 8033.

Furthermore, the data acquisition module comprises a data acquisition card, and the data acquisition card preferably adopts a high-frequency acquisition card, can acquire high-frequency signals and is not distorted; the data acquisition module is mainly used for acquiring signals, performing analog-to-digital conversion, transmitting signal waveforms to an upper computer for further analysis, and displaying measurement results on software through algorithm processing.

Furthermore, the USB communication module adopts a USB serial port communication protocol, can be connected with an upper computer, and is mainly used for facilitating the timely communication between the data acquisition module and the photoelectric detection module and the upper computer, performing man-machine interaction and facilitating the operation of a tester.

Furthermore, the power management module gives consideration to the overall arrangement of the power of the whole device, ensures reasonable distribution of energy resources of the device, and reduces unnecessary wiring, so that the layout of the whole device is more reasonable and attractive. The power supply management module mainly comprises two voltage transformation circuits, one is a 24V-to-5V voltage reduction circuit, and the other is a 24V-to-15V voltage reduction circuit; the 5V circuit is used for supplying power to the USB communication module and the data acquisition module, and the 15V circuit is used for supplying power to the photoelectric signal conversion module and the operational amplifier module.

Furthermore, the optical detection device further comprises a BNC interface and a USB interface, wherein the BNC interface is used for connecting an oscilloscope, one end of the coaxial line is connected into the BNC interface, and the other end of the coaxial line is connected into the oscilloscope, so that the oscilloscope can be operated to capture proper waveforms, and the result is obtained through measurement and calculation; one end of a USB wire is connected into the USB interface, and the other end of the USB wire is connected into the upper computer, so that the connection between the USB interface and the upper computer can be realized.

The utility model has the beneficial effects that: compared with the prior art, the optical detection device for the response time of the MiniLED has the advantages of simple structure, convenience in operation, lightness, portability, high precision, low cost, convenience in installation and debugging, suitability for optical detection in various occasions, strong environmental adaptability and the like; this optical detection device adopts detachable hookup, can assemble and carry out the product test on other boards, improves the production efficiency of enterprise greatly, reduces unnecessary manpower extravagant.

In addition, the optical detection device also comprises the following advantages:

1) low brightness: because of the PMT, the change of ultra-low brightness can be collected. (the testing range is 0.1 nit-20000 nit).

2) Precision: by adopting the macro lens and the positioning camera, real-time alignment monitoring is realized, meanwhile, the minimum detection diameter reaches 60um through high-magnification amplification of the ultramicro lens and small field control of a test range, and the brightness of a single Mini LED can be detected.

3. High speed: the response time of the detection device is 2.2ns, so that the response test requirement of the Mini LED at the level of 100ns can be accurately detected.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a block diagram of the structure of each functional module in the optical detection apparatus provided by the present invention.

Fig. 2 is a schematic circuit diagram of a power management module in the optical detection apparatus according to the present invention.

Fig. 3 is a schematic circuit diagram of an operational amplifier module in the optical detection apparatus according to the present invention.

Fig. 4 is a schematic diagram of an optical path involved in the optical detection apparatus provided in the present invention.

Fig. 5 is a schematic diagram of an optical path structure in the optical detection apparatus provided by the present invention.

Fig. 6 is a schematic structural diagram of an optical detection apparatus provided in the present invention.

Wherein, 1-industrial lens; 2-a front panel; 3-a base; 4-a data acquisition card; 5-an optical path structure; 6-a rear panel; 7-a power switch; 8-power interface; 9-BNC interface; 10-USB interface; 11-a handle; 12-a PCB; 13-a photoelectric signal conversion module; 14-a power management module; 15-a photoelectric detection module; 16-an operational amplifier module; 17-a data acquisition module; 18-a USB communication module; 19-a photomultiplier tube; 20-positioning the camera; 21-a lens sleeve; 22-a mini T-stage; 23-optical lens group.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Examples

As shown in fig. 1, an optical detection device for MiniLED response time mainly includes a photoelectric detection module 15, a light path structure 5, a photoelectric signal conversion module 13, an operational amplifier module 16, a data acquisition module 17, a USB communication module 18, and a power management module 14; the photoelectric signal conversion module 13 and the photoelectric detection module 15 are both connected with the optical path structure 5; the operational amplifier module 16 is connected with the photoelectric signal conversion module 13; the data acquisition module 17 is connected with the operational amplifier module 16; the USB communication module 18 is connected with the photoelectric detection module 15 and the data acquisition module 17; the power management module 14 is used for allocating and managing energy resources of the whole detection device.

As shown in fig. 4-6, the photodetection module 15 is mainly composed of an industrial lens 1 and a positioning camera 20. The optical path structure 5 includes a micro T-stage 22, a mirror lens sleeve 21, and an optical lens group 23. The photoelectric signal conversion module 13 mainly comprises a photomultiplier tube 19, and the response time of the photomultiplier tube 19 is 2.2 nanoseconds. The main control chip of the operational amplifier amplifying module 16 is AD 8033. The data acquisition module 17 adopts a high-frequency data acquisition card 4. The USB communication module 18 adopts a USB serial port communication protocol to perform human-computer interaction. The power management module 14 comprises two voltage transformation circuits, one is a 24V-to-5V voltage reduction circuit, and the other is a 24V-to-15V voltage reduction circuit; the 5V circuit is used for supplying power to the USB communication module 18 and the data acquisition module 17, and the 15V circuit is used for supplying power to the photoelectric signal conversion module 13 and the operational amplifier amplification module 16.

The optical detection device has a specific structure as shown in fig. 6, and comprises a front panel 2, a base 3 and a rear panel 6, wherein the front panel 2 is provided with an industrial lens 1, and the rear panel 6 is provided with a power switch 7, a power interface 8, a BNC interface 9 and a USB interface 10; the data acquisition card 4, the optical path structure 5 and the PCB12 are arranged between the front panel 2 and the rear panel 6, and in addition, the handle 11 is arranged for carrying. In particular, the drive signal should be switched to the MiniLED product from one brightness level H to another. The power switch 7 of the optical detection device is turned on, the position is adjusted, the optical detection device is aligned to the MiniLED product, the upper computer is connected with the USB interface 10 of the optical detection device through a USB wire, a driving program of the positioning camera 20 is turned on, and the focal length and the aperture size of the lens are adjusted until a clear image appears on the screen of the upper computer. And opening the upper computer software of the optical detection device, clicking a button, and measuring a result. In addition, one end of the coaxial line can be connected to the BNC interface 9 of the optical detection device, the other end of the coaxial line is connected to the oscilloscope, the oscilloscope is operated to capture a proper waveform, and the result is obtained through measurement and calculation.

The above embodiments are only for illustrating the utility model and are not to be construed as limiting the utility model, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, therefore, all equivalent technical solutions also belong to the scope of the utility model, and the scope of the utility model is defined by the claims.

Claims

1. An optical detection device for MiniLED response time, characterized in that: the detection device mainly comprises a photoelectric detection module, a light path structure, a photoelectric signal conversion module, an operational amplifier module, a data acquisition module, a USB communication module and a power management module; the photoelectric signal conversion module and the photoelectric detection module are both connected with the light path structure; the operational amplifier amplification module is connected with the photoelectric signal conversion module; the data acquisition module is connected with the operational amplifier amplification module; the USB communication module is connected with the photoelectric detection module and the data acquisition module; and the power supply management module is used for distributing and managing energy resources of the whole detection device.

2. The apparatus of claim 1, wherein the MiniLED response time optical detection device comprises: the photoelectric detection module mainly comprises an industrial lens and a positioning camera and is used for capturing image signals.

3. The apparatus of claim 1, wherein the MiniLED response time optical detection device comprises: the optical path structure comprises a micro T-shaped platform, a lens sleeve and an optical lens group so as to facilitate signal transmission.

4. The apparatus of claim 1, wherein the MiniLED response time optical detection device comprises: the photoelectric signal conversion module mainly comprises a photomultiplier tube, can convert photoelectric signals in time and ensures the timeliness of data transmission; the response time of the photomultiplier tube was 2.2 nanoseconds.

5. The apparatus of claim 1, wherein the MiniLED response time optical detection device comprises: the operational amplifier module amplifies the output signal of the photoelectric signal conversion module, so that data can be conveniently acquired and processed; the main control chip of the operational amplifier amplification module is AD 8033.

6. The apparatus of claim 1, wherein the MiniLED response time optical detection device comprises: the data acquisition module comprises a data acquisition card and is mainly used for acquiring signals and performing analog-to-digital conversion.

7. The apparatus of claim 1, wherein the MiniLED response time optical detection device comprises: the USB communication module adopts a USB serial port communication protocol, can be connected with an upper computer and performs man-machine interaction.

8. The apparatus of claim 1, wherein the MiniLED response time optical detection device comprises: the power management module mainly comprises two paths of voltage transformation circuits, wherein one path is a 24V-to-5V voltage reduction circuit, and the other path is a 24V-to-15V voltage reduction circuit.

9. The apparatus of claim 1, wherein the MiniLED response time optical detection device comprises: the optical detection device also comprises a BNC interface and a USB interface, wherein the BNC interface is used for connecting an oscilloscope; the USB interface is used for connecting an upper computer.