CN116642670B - Optical imaging method and device for micro display detection - Google Patents
Optical imaging method and device for micro display detection Download PDFInfo
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Abstract
The invention discloses an optical imaging method and device for micro-display detection, and belongs to the technical field of micro-display detection. The invention amplifies the virtual image of tens times to tens times through the amplifying lens/lens composition, then carries on clear imaging to the amplified virtual image of the micro-display picture through the NED detecting lens, the entrance pupil of the NED detecting lens is preposed, locates at the exit pupil position of the amplifying lens, the entrance pupil diameter is larger than the exit pupil diameter of the amplifying lens/lens group, the angle of view is larger than the angle of view of the amplifying lens/lens group, realizes the 'full shooting' to the whole picture, can see the pixel point, and the imaging is even, and further improves the precision and accuracy of the micro-display defect detection. The invention can be applied to micro display defect detection and/or optical measurement with small size and high resolution.
Description
Technical Field
The invention belongs to the technical field of micro-display detection, and particularly relates to an optical imaging method and device for micro-display detection.
Background
Microdisplays are increasingly used in applications such as wearable VR, MR and AR. When the display image is enlarged, filling the user's field of view, the defect of the display will also be enlarged. Drawbacks of microdisplays include, but are not limited to: brightness or color non-uniformity, contrast problems, moire, line and pixel defects, viewing angle differences, image retention/ghosting. These defect problems become more pronounced as the user's eyes are only a few centimeters away from the display screen.
In order to improve the product quality and meet the requirements of users, advanced optical detection equipment is required to detect the micro-display before delivery. Unlike conventional display detection, this is improved by optics due to the smaller size of the microdisplay, which represents an ergonomic, manufacturing size, weight and scalability challenge.
The defect detection of the existing micro-display usually needs to use an optical system such as a microscope to ensure the quality of the product. However, the micro-display picture image obtained by the detection method has the problems of unclear and uneven image, further causes low defect detection efficiency, and cannot meet the detection requirement.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an optical imaging method and device for detecting a micro-display, which aims to solve the problems of unclear and uneven imaging of the existing microscope optical system for the micro-display.
To achieve the above object, in a first aspect, the present invention provides an optical imaging method for micro display detection, comprising: obtaining an enlarged virtual image of the micro display picture by using an enlarged lens/lens group; then using NED detection lens to make clear imaging of amplified virtual image of miniature display picture; the NED detection lens is arranged in front of the entrance pupil and is positioned at the exit pupil position of the magnifying lens, the entrance pupil diameter is larger than the exit pupil diameter of the magnifying lens/lens group, and the field angle is larger than the field angle of the magnifying lens/lens group.
Preferably, the specific operation of the clear imaging real image is as follows: adjusting the optical imaging assembly to focus to infinity so as to simulate the human eye; and adjusting the distance between the magnifying lens/lens group and the micro display, or adjusting the focal length of the magnifying lens/lens group so as to clearly form a real image.
Preferably, the criteria for the clear imaging are: the 1 pixel of the virtual image of the micro display screen is not lower than 2 pixels after imaging.
Preferably, the method further comprises: shooting imaging of a virtual image to obtain a virtual image imaged picture; defect detection and/or optical measurement is performed from the image imaged by the virtual image.
To achieve the above object, in a second aspect, the present invention provides an optical imaging apparatus for micro display detection, comprising: the magnifying lens/lens group and the NED detection lens are sequentially arranged; the micro display is positioned in the focal length of the magnifying lens/lens group, so that the micro display frame forms a magnified virtual image at the magnifying lens/lens; the NED detection lens is arranged in front of the entrance pupil and is positioned at the exit pupil position of the amplifying lens, the entrance pupil diameter is larger than the exit pupil diameter of the amplifying lens/lens group, and the view angle is larger than the view angle of the amplifying lens/lens group, so that the amplified virtual image of the micro display picture can be clearly imaged.
Preferably, the criteria for the clear imaging are: the 1 pixel of the virtual image of the micro display screen is not lower than 2 pixels after imaging.
Preferably, the method further comprises: the distance adjusting mechanism is used for adjusting the working distance of the optical imaging assembly; the focusing mechanism is used for adjusting the focusing distance of the optical imaging assembly; and a zoom mechanism for adjusting the focal length of the magnifying lens/lens group.
Preferably, the method further comprises: an image acquisition module configured to acquire a virtual imaged picture of a display of the micro-display, the virtual imaged picture being further used for defect detection and/or optical measurement of the micro-display.
Preferably, the image acquisition module is an area camera, an area luminance meter or an area colorimeter.
In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:
the invention discloses an optical imaging method and device for micro-display detection, which comprises amplifying a virtual image which is ten times to tens times by an amplifying lens/lens, and then carrying out clear imaging on the amplifying virtual image of a micro-display picture by a NED detection lens, wherein the NED detection lens is arranged in front of an entrance pupil and is positioned at an exit pupil position of the amplifying lens, the entrance pupil diameter is larger than the exit pupil diameter of the amplifying lens/lens group, and the angle of view is larger than the angle of view of the amplifying lens/lens group. The invention can be applied to micro display defect detection and/or optical measurement with small size and high resolution.
Drawings
Fig. 1 is a schematic structural diagram of an optical imaging device for detecting a micro display according to an embodiment of the present invention.
Fig. 2 is a flowchart of an optical imaging method for micro-display detection according to an embodiment of the present invention.
Fig. 3 is a photograph taken directly with a microscope.
Fig. 4 is a photograph taken with an optical imaging apparatus designed according to an embodiment of this invention.
The same reference numbers are used throughout the drawings to reference like elements or structures, wherein: 1-area array equipment; 2-NED detection lens; 3-magnifying lenses; 4-a micro display; 5-virtual image.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The terms involved in the present invention are explained as follows: NED: near eye display; VR: virtual Reality; MR: mixed Reality; AR: augmented Reality, augmented reality; MLA: micro Lens Array, micro Lens Array.
The invention provides an optical imaging device for micro display detection, comprising: the micro display is positioned in the focal length of the amplifying lens/lens group, so that an amplified virtual image is formed by the micro display picture at the amplifying lens/lens; the optical imaging component is used for clearly imaging the amplified virtual image of the micro display picture.
The invention relates to a "micro display" which refers to a display having a size of not more than 2.5 inches, and includes, but is not limited to: VR display, MR display, AR display, watch display.
Preferably, the criteria for the clear imaging are: the 1 pixel of the virtual image of the micro display screen is not lower than 2 pixels after imaging.
Preferably, the optical imaging component is a NED detection lens.
Preferably, the method further comprises: the distance adjusting mechanism is used for adjusting the working distance of the optical imaging assembly; the focusing mechanism is used for adjusting the focusing distance of the optical imaging assembly; and a zoom mechanism for adjusting the focal length of the magnifying lens/lens group.
Preferably, the method further comprises: an image acquisition module configured to acquire a virtual imaged picture of a display of the micro-display, the virtual imaged picture being further used for defect detection and/or optical measurement of the micro-display.
Preferably, the image acquisition module is an area camera, an area luminance meter or an area colorimeter.
The invention provides an optical imaging method for micro display detection, which comprises the following steps: obtaining an enlarged virtual image of the micro display picture by using an enlarged lens/lens group; and then the optical imaging component is used for clearly imaging the amplified virtual image of the micro display picture.
Preferably, the specific operation of the clear imaging real image is as follows: adjusting the optical imaging assembly to focus to infinity so as to simulate the human eye; and adjusting the distance between the magnifying lens/lens group and the micro display, or adjusting the focal length of the magnifying lens/lens group so as to clearly form a real image.
Preferably, the criteria for the clear imaging are: the 1 pixel of the virtual image of the micro display screen is not lower than 2 pixels after imaging.
Preferably, the method further comprises: shooting imaging of a virtual image to obtain a virtual image imaged picture; defect detection and/or optical measurement is performed from the image imaged by the virtual image.
The present invention provides an optical imaging apparatus for microdisplay detection, the apparatus comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of an optical imaging method for microdisplay detection as described above.
The present invention provides a computer readable storage medium storing a computer program which when executed by a processor implements an optical imaging method for microdisplay detection as described above.
The invention provides a micro display defect detection device, comprising: the micro display is positioned in the focal length of the magnifying lens/lens group, so that the micro display frame forms a magnified virtual image at the magnifying lens/lens; the optical imaging assembly is used for clearly imaging the amplified virtual image of the micro display picture; the image acquisition module is configured to acquire a picture imaged by the virtual image of the micro display; and the defect detection module is configured to detect defects according to the pictures imaged by the virtual images.
The invention provides a micro display defect detection method, which comprises the following steps:
s1, adjusting the working distance of an optical imaging assembly;
s2, adjusting focusing of the optical imaging assembly to infinity;
s3, adjusting the distance between the amplifying lens/lens group and the micro display, or adjusting the focal length of the amplifying lens/lens group until the image is clear.
S4, performing defect detection according to the micro display picture virtual image imaging picture obtained by the image obtaining module.
Details of steps S1 to S3 are not repeated, and are consistent with details of an optical imaging method for micro-display detection.
The present invention provides a micro display defect detection apparatus, the apparatus comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of a method for detecting a micro display defect as described above.
The present invention provides a computer readable storage medium storing a computer program which when executed by a processor implements a micro display defect detection method as described above.
Examples
As shown in fig. 1, the present embodiment provides an optical imaging device for detecting a micro display, including: an area array device 1, an NED detection lens 2, an magnifying lens 3 and a micro display 4. The micro display 4 is used for displaying pictures. The micro-display 4 is positioned within the focal length of the magnifying lens 3, so that the micro-display 4 is magnified by tens to tens times of virtual images 5 at the magnifying lens/3, and objects and images are on the same side of the magnifying lens. The NED detection lens 2 is configured to clearly form a real image of an enlarged virtual image 5 of the frame of the micro display 4, where the real image is reduced relative to the virtual image, but the whole is still enlarged. An area array device 1 for taking imaged picture data of a virtual image 5. Compared with direct shooting, the image data obtained by the method is enlarged to be capable of clearly seeing the pixel points, and imaging is relatively uniform.
Wherein,is the object distance->Is the image distance (the same side as the object, < >>Like and foreign matter side->），/>For focal length->Is the magnification of the magnifying lens.
Preferably, the criteria for the clear imaging are: the 1 pixel of the virtual image of the micro display screen is not lower than 2 pixels after imaging.
Preferably, the NED detection lens 2 is located at the exit pupil position of the magnifying lens 3.
Preferably, the NED detection lens 2 has an entrance pupil diameter larger than an exit pupil diameter of the magnifying lens, and an angle of view larger than that of the magnifying lens.
Preferably, the apparatus further comprises: and the distance adjusting mechanism is used for adjusting the working distance WD of the NED detection lens. In this embodiment, the working distance of the NED detection lens is adjusted.
Preferably, the NED detection lens is arranged in front of a diaphragm, the size of the diaphragm changes with the size of the exit pupil of the micro-display, the size of the field angle changes with the size of the micro-display, and the maximum field angle is 125 °. In this embodiment, the diaphragm size may be manually changed for simulating the human eye.
Preferably, the apparatus further comprises: and the focusing ring is used for adjusting the focusing distance of the optical imaging assembly. In the present embodiment, in the range ofThe focusing distance of the NED detection lens is internally adjusted so that the virtual image is at +.>Where, thereby enlarging +.>Multiple times.
Preferably, the size of the field angle of the magnifying lens varies with the size of the micro display, and the maximum field angle is 120 °.
Preferably, the apparatus further comprises: and the zoom ring is used for adjusting the focal length of the magnifying lens. The present embodiment zoom adjusts the focal length of the magnifying lens so that a clear real image is formed.
Preferably, the area array device includes, but is not limited to: an area camera, an area luminance meter, or an area chrominance meter.
Preferably, the virtual imaged picture is further used for defect detection and/or optical measurement of the micro display.
As shown in fig. 2, the present embodiment provides an optical imaging method for detecting a micro display, including:
s1, adjusting the working distance of an NED detection lens;
s2, adjusting the NED detection lens to focus to infinity;
s3, adjusting the distance between the amplifying lens and the micro display, or adjusting the focal length of the amplifying lens until the image is clear.
The method further comprises the steps of: s4, performing defect detection or optical measurement according to the micro display picture virtual image imaging picture obtained by the area array equipment.
The present invention supports defect detection or optical measurement by conventional algorithms, deep learning algorithms, or a combination of both.
Defect detection mode one: the method comprises the steps of inputting a preset test image to a micro display for display, and collecting a virtual image imaging image when the preset test image is displayed on the micro display. And then carrying out graying treatment on the virtual image imaging image to obtain a gray image, carrying out parameter filtering treatment on the gray image to obtain a filtered image, carrying out smoothing treatment on the gray image, carrying out pixel gray value difference treatment on the gray image and the filtered image to obtain a defect salient image, carrying out filtering on the imaged image for two times with different parameters to obtain an image frame after the filtering for two times, carrying out difference on the pixel gray values of the image frame after the filtering for two times, and comparing the pixel gray values of the image frame after the filtering for two times with the image defect characteristics in the imaged image, wherein the image defect characteristics in the defect salient image are clearer and more obvious, further, the image defect characteristics in the defect salient image are easier to identify, and the screen defect information (the screen defect information can comprise the defect position and the defect type of the screen defect) of the display screen is determined according to the image defect characteristics, so that the automatic detection on the display screen of the extended reality equipment is realized.
Defect detection mode two: binarization processing is carried out on the micro-display picture virtual image imaging picture, and then the outline of the display area of the screen to be detected is determined according to the binarized image; determining suspected defect points in the outline of the display area based on a neural network transformation model; acquiring an interception range associated with the suspected defect point; determining the pretreatment area corresponding to the suspected defect point according to the interception range; taking the region to be treated with the gray average value and the region area meeting preset conditions as a suspected defect region; and determining whether the screen to be detected has a defect or not according to the matching degree between the local image corresponding to the suspected defect area and the template image.
The micro display with MLA itself emits light unevenly.
When the microscope is used for direct shooting, the obtained picture is as shown in fig. 3, the picture is very uneven, and the pixel points are not seen clearly.
When the optical imaging device designed by the invention is used for shooting, the acquired picture is shown in fig. 4, each pixel point can be seen clearly, and the imaging is relatively uniform.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. An optical imaging method for micro-display detection, comprising:
obtaining an enlarged virtual image of the micro display picture by using an enlarged lens/lens group;
then using NED detection lens to make clear imaging of amplified virtual image of miniature display picture;
finally, shooting a real image formed by the NED detection lens on the amplified virtual image to obtain a picture of the real image formed by the virtual image;
the NED detection lens is arranged in front of the entrance pupil and is positioned at the exit pupil position of the magnifying lens, the diameter of the entrance pupil is larger than that of the exit pupil of the magnifying lens/lens group, and the angle of view is larger than that of the magnifying lens/lens group;
the specific operation of the clear imaging is as follows:
adjusting the NED detection lens to focus to infinity so as to simulate human eyes;
and adjusting the distance between the magnifying lens/lens group and the micro display, or adjusting the focal length of the magnifying lens/lens group so as to clearly form a real image.
2. The method of claim 1, wherein the clear imaging criteria are: the 1 pixel of the virtual image of the micro display screen is not lower than 2 pixels after imaging.
3. The method of claim 1 or 2, further comprising:
defect detection and/or optical measurement is performed from a picture of the virtual image imaging real image.
4. An optical imaging device for microdisplay detection, comprising: the magnifying lens/lens group and the NED detection lens are sequentially arranged;
the micro display is positioned in the focal length of the magnifying lens/lens group, so that the micro display frame forms a magnified virtual image at the magnifying lens/lens;
the NED detection lens is arranged in front of the entrance pupil and is positioned at the exit pupil position of the amplifying lens, the entrance pupil diameter is larger than the exit pupil diameter of the amplifying lens/lens group, and the view angle is larger than the view angle of the amplifying lens/lens group, so that the amplified virtual image of the micro display picture can be clearly imaged;
the image acquisition module is configured to shoot a real image formed by the NED detection lens on the amplified virtual image, and obtain a picture of the real image formed by the virtual image;
and a zoom mechanism for adjusting the focal length of the magnifying lens/lens group.
5. The apparatus of claim 4, wherein the criteria for sharp imaging are: the 1 pixel of the virtual image of the micro display screen is not lower than 2 pixels after imaging.
6. The apparatus as recited in claim 4, further comprising:
the distance adjusting mechanism is used for adjusting the working distance of the optical imaging assembly;
and the focusing mechanism is used for adjusting the focusing distance of the optical imaging assembly.
7. A device as claimed in any one of claims 4 to 6, wherein the virtual imaged picture is further used for defect detection and/or optical measurement of a micro-display.
8. The apparatus of claim 7, wherein the image acquisition module is an area camera, an area luminance meter, or an area chrominance meter.
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