CN215448189U - Display image detection device - Google Patents

Abstract

A display image detection device comprises a light splitting component, a detection lens, an imaging detection component and a color detection component. The light splitting assembly is used for splitting the image light to be detected transmitted along the common detection light path into a split beam transmitted along the imaging detection light path and a split beam transmitted along the color detection light path. The detection lens comprises a front diaphragm and a lens group which are sequentially arranged along the common detection light path, and is used for enabling the image light to be detected to sequentially pass through the front diaphragm and the lens group and then be transmitted to the light splitting component. The imaging detection assembly is correspondingly disposed in the imaging detection optical path and is used for receiving the sub-beam propagating along the imaging detection optical path to perform measurement related to imaging performance. The color detection assembly is disposed in the color detection optical path, and is used for receiving the sub-beams propagating along the color detection optical path to perform photometric and colorimetric related measurement.

Description

Display image detection device

Technical Field

The utility model relates to the technical field of near-eye display, in particular to a display image detection device.

Background

In recent years, the use of augmented or virtual reality (AR/VR) devices has grown rapidly in various industries, such as gaming, military, education, transportation, and medicine. With the growth of the market, since AR/VR device manufacturers each adopt a unique method to integrate displays into devices, different display devices generally have different geometries and display specifications, and there is an increasing need for methods or means for measuring various types of AR, VR or MR displays (collectively, near-eye displays, NED) that are suitable for various types of complex situations.

Near-eye display devices, as a class of display systems that require viewing as close to the eye as possible, while providing the ability to provide immersive visual input, display imperfections that otherwise would compromise the user experience can be magnified along with the magnification of the displayed image. Meanwhile, for the experience of the display picture, if the visual feeling of human eyes is used as the evaluation standard, the evaluation result is different from person to person, and the subjective feeling is naturally difficult to be left. How to objectively quantitatively characterize the specific display performance of the near-eye display device is particularly important to accurately measure and judge, so that it becomes an emerging demand to reasonably and effectively test the near-eye display. However, while there are some techniques in the prior art that attempt to meet the unique test criteria for near-eye displays, there are significant limitations in fully addressing all measurable near-eye display characteristics. Some of the problems or disadvantages of conventional measurement methods are briefly described as follows:

1) the measuring method adopting the machine vision camera comprises the following steps: the key limitation is that it is not suitable for absolute brightness and color measurements. Since conventional machine vision systems capture only relative data, do not provide metrology data to measure the absolute brightness or color of a human eye's visualization in an illuminated display, and machine vision is typically used to make rapid and repetitive measurements of visual features, many conventional machine vision systems sacrifice resolution for increased speed, but display defects may occur on the order of a single display pixel, which may miss those that are apparent to a person viewing a near-eye display if the measurement system is unable to identify defects from one pixel to another in a high-resolution display.

2) The measurement method matched with the standard optical lens comprises the following steps: standard optical solutions are not suitable for simulating the human eye to measure in the environment of near-eye displays, which is a limitation of conventional optical hardware designs. For example, a conventional 35mm lens has an internal aperture whose position results in an occlusion of the entire field of view (FOV) of the display, i.e. a portion of the measurement field of view is blocked. Since the lens aperture and the entrance pupil of the near-eye display are not perfectly matched and engaged, the light will be blocked by the lens housing and the edge of the entrance aperture of the near-eye display, and the entire field of view of the near-eye display cannot be captured.

In fact, the conventional measurement device is difficult to be compatible with various display image measurements at the same time, that is, it is difficult to detect the display images at various distances (or diopters) and simultaneously cover a wide field of view, such as the detection of a near-to-eye display with a horizontal field angle of 120 ° (± 60 °), which is mainly reflected in the difficulty in designing an optical detection lens for realizing diopter adjustment and an oversized field of view. In addition, traditional supporting camera lens is mostly wide-angle lens or fisheye lens, and the camera lens that corresponds is bulky and the distortion is serious to it does not match with spatial information to cause the detection image spatial position distortion of collection, can only correct through subsequent image processing, but this also can produce certain influence to the original image of collection.

SUMMERY OF THE UTILITY MODEL

An advantage of the present invention is to provide a display image detection apparatus capable of accurately and comprehensively measuring a display image of a near-eye display so as to objectively evaluate a display performance of the near-eye display.

One advantage of the present invention is to provide a display image detection apparatus, which can effectively provide some possible flexible and innovative optical path arrangement forms and ideas in combination with the possibility of practical engineering application, so as to better duplicate the eye impression of human eyes, and further achieve the goal of accurately measuring the near-eye display and the display quality thereof.

Another advantage of the present invention is to provide a display image detection apparatus, wherein in an embodiment of the present invention, the display image detection apparatus can combine and match the imaging detection optical path and the color detection optical path to achieve accurate and comprehensive measurement, so as to better characterize the characteristics of human eyes.

Another advantage of the present invention is to provide a display image detection apparatus, wherein, in an embodiment of the present invention, the display image detection apparatus can integrate and cooperate an imaging detection system and a photometric/colorimetric detection system with reasonable optical devices, so as to achieve accurate and comprehensive near-eye display image measurement.

Another advantage of the present invention is to provide a display image detection apparatus, wherein, in an embodiment of the present invention, the display image detection apparatus can accurately represent human eye characteristics through an iris diaphragm and a diopter adjustable detection lens disposed in front.

Another advantage of the present invention is to provide a display image detection apparatus, wherein, in an embodiment of the present invention, the display image detection apparatus can combine the light splitting elements to form a dual light path detection system, through which one light path realizes a measurement related to imaging performance to capture an image equivalent in detail and definition to an image seen by human eyes for the same quality determination; meanwhile, the other path of light can realize the measurement related to the luminosity and the chromaticity so as to accurately measure the key brightness and color information of the displayed image.

Another advantage of the present invention is to provide a display image detection apparatus, wherein in an embodiment of the present invention, the display image detection apparatus can perfectly and comprehensively characterize the performance of a display image, and effectively avoid various problems of a conventional image detection system.

Another advantage of the present invention is to provide a display image detection apparatus, wherein, in an embodiment of the present invention, the display image detection apparatus can use a specially designed detection lens together with an image sensor and a photometric/colorimetric sensor to form a unique optical system specially used for measuring a near-eye display, so as to accurately evaluate the display quality of the near-eye display.

Another advantage of the present invention is to provide a display image detection apparatus, wherein, in an embodiment of the present invention, the display image detection apparatus can accurately reproduce the position of the human eye in the near-eye display by using the front diaphragm, so that the captured display image is not obstructed and interfered, so as to accurately reproduce the human eye impression.

Another advantage of the present invention is to provide a display image detection apparatus, wherein in an embodiment of the present invention, the display image detection apparatus can further compress the front size by introducing a turning prism at the front of the detection lens, so as to reduce the front volume, and make the space more compact, so as to be suitable for most application measurement scenarios.

Another advantage of the present invention is to provide a display image detection apparatus, wherein in an embodiment of the present invention, the display image detection apparatus can capture all details in a display image by using a detection lens with sufficient resolution, so as to realize pixel level defect detection. Meanwhile, the detection lens is a lens with adjustable diopter, and can realize the diopter adjustment function in a larger range so as to achieve the purpose of image detection compatible with various types of image display equipment with diopter adjustment.

Another advantage of the present invention is to provide a display image detection apparatus, wherein, in an embodiment of the present invention, the display image detection apparatus can adopt a dual optical path detection system to transmit a path of light to an image sensor, so as to achieve detection of indexes such as definition, field angle, distortion, and the like; and the other path of light is transmitted to the luminosity and chrominance sensor so as to realize accurate measurement of the brightness and chrominance values of the display picture, so that the back-and-forth switching between the measurement of an imaging end and the detection of the luminosity and chrominance end is avoided, the time is saved, and the detection efficiency is improved.

Another advantage of the present invention is to provide a display image detection apparatus in which it is not necessary to use expensive materials or complicated structures in order to achieve the above object. Therefore, the present invention successfully and effectively provides a solution not only to provide a simple display image detection apparatus, but also to increase the practicality and reliability of the display image detection apparatus.

To achieve at least one of the above advantages or other advantages and objects, the present invention provides a display image detection apparatus including:

the system comprises a light splitting component, a light source module and a light source module, wherein the light splitting component defines a common detection light path, an imaging detection light path and a color detection light path and is used for splitting the light of an image to be detected transmitted along the common detection light path into a split beam transmitted along the imaging detection light path and a split beam transmitted along the color detection light path;

the detection lens comprises a front diaphragm and a lens group which are sequentially arranged along the common detection light path, and is used for enabling the image light to be detected transmitted along the common detection light path to sequentially pass through the front diaphragm and the lens group and then be transmitted to the light splitting component;

an imaging detection assembly, wherein the imaging detection assembly is correspondingly disposed in the imaging detection optical path and is used for receiving the sub-beam propagating along the imaging detection optical path to perform measurement related to imaging performance; and

a color detection assembly, wherein the color detection assembly is disposed in the color detection optical path, respectively, for receiving the sub-beams propagating along the color detection optical path to perform photometric and colorimetric related measurements.

According to an embodiment of the present application, the light splitting component is a light splitting prism, wherein the light splitting prism includes a first prism, a second prism, and a light splitting element, wherein the first prism and the second prism are oppositely arranged in a manner of inclined surface to inclined surface, and the light splitting element is disposed between the inclined surface of the first prism and the inclined surface of the second prism, and is configured to reflect a part of the light beams of the image light to be measured and transmit another part of the light beams of the image light to be measured.

According to an embodiment of the present application, the light splitting assembly is a light splitting plate, wherein the light splitting plate includes a transparent substrate and a light splitting element, wherein the light splitting element is disposed on a surface of the transparent substrate, and is configured to reflect a part of the light beam of the image light to be measured and transmit another part of the light beam of the image light to be measured.

According to an embodiment of the application, the light splitting component includes special-shaped light splitting prism, wherein special-shaped light splitting prism has towards the income plain noodles of detecting lens, towards the plane of splitting of colour detecting element and towards the play plain noodles of formation of image detecting element, wherein special-shaped light splitting prism the income plain noodles, divide the plain noodles and go out the plain noodles mutually non-parallel, and special-shaped light splitting prism divide the plane of splitting this image light that awaits measuring that incides from the income plain noodles and be used for with the beam splitting of this image light beam splitting that the income plain noodles penetrated by the beam splitting plane transmission with by the beam splitting light that the plane of splitting reflects.

According to an embodiment of the present application, the special-shaped light splitting prism includes a special-shaped prism and a light splitting element, wherein the light splitting element is correspondingly disposed on a side surface of the special-shaped prism corresponding to the color detection assembly to form the light splitting surface of the special-shaped light splitting prism, and is configured to reflect a part of the light beam of the image light to be detected and transmit another part of the light beam of the image light to be detected.

According to an embodiment of the present application, the special-shaped light splitting prism further has a light reflecting surface, wherein the light reflecting surface of the special-shaped light splitting prism is arranged opposite to the light incident surface of the special-shaped light splitting prism, and is configured to reflect the image light to be measured incident from the light incident surface to the light splitting surface.

According to an embodiment of the present application, the light splitting assembly further includes an additional reflection prism, wherein the additional reflection prism is correspondingly disposed between the light splitting surface of the special-shaped light splitting prism and the color detection assembly, and is used for reflectively turning the color detection light path.

According to an embodiment of the present application, the light splitting element is a polarization light splitting film or a partially reflective film.

According to an embodiment of the present application, the color detection assembly includes a field diaphragm, a relay lens and a photometric/colorimetric sensor sequentially disposed along the color detection optical path, and is configured to enable the sub-beam propagating along the color detection optical path to sequentially pass through the field diaphragm and the relay lens, and then to be received by the photometric/colorimetric sensor to obtain photometric/colorimetric information.

According to an embodiment of the application, the field stop is disposed at an intermediate image plane of an optical system formed by the light splitting assembly and the detection lens.

According to an embodiment of the present application, the color detection assembly further comprises a rear diaphragm, wherein the rear diaphragm is correspondingly disposed in an optical path between the relay lens and the photometric/colorimetric sensor, and the rear diaphragm and the front diaphragm are in an object-image conjugate relation with respect to an optical system composed of the lens group, the light splitting assembly, and the relay lens.

According to an embodiment of the present application, the photometric and colorimetric sensors are located at a back focal point of an optical system composed of the lens group, the light splitting assembly and the relay lens, and the field stop and the photometric and colorimetric sensors are in an object-image conjugate relationship with respect to the relay lens.

According to an embodiment of the application, the color detection apparatus further comprises a reflective element, wherein the reflective element is correspondingly disposed in an optical path between the field stop and the relay lens for reflectively deflecting the color detection optical path.

According to an embodiment of the present application, the detection lens further includes a turning prism, wherein the turning prism is disposed in an optical path between the front stop and the lens group, for turning the common detection optical path.

According to an embodiment of the present application, the turning prism has an incident surface facing the front stop, a first reflecting surface, and an exit surface facing the lens assembly, and is configured to make the image light to be measured passing through the front stop first enter the turning prism through the incident surface, and then exit from the exit surface to be transmitted to the lens assembly after being reflected by the first reflecting surface to change the transmission direction.

According to an embodiment of the present application, the turning prism further has a second reflection surface, wherein the second reflection surface of the turning prism is disposed opposite to the first reflection surface of the turning prism, and is configured to reflect the image light to be measured incident from the incident surface through the first reflection surface to change the propagation direction for the first time, and then reflect the image light to be measured through the second reflection surface to change the propagation direction again, and then emit the image light to be measured from the exit surface to propagate to the lens assembly.

According to an embodiment of the application, the front diaphragm has an adjustable aperture to form an iris diaphragm, and the detection lens is a diopter adjustable lens.

Further objects and advantages of the utility model will be fully apparent from the ensuing description and drawings.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

Fig. 1 is a schematic configuration diagram of a display image detection apparatus according to a first embodiment of the present invention.

Fig. 2 shows a schematic optical path diagram of the display image detection apparatus according to the above-described first embodiment of the present invention.

Fig. 3 shows a modified embodiment of the display image detection apparatus according to the above-described first embodiment of the present invention.

Fig. 4 is a schematic optical path diagram of a display image detection apparatus according to a second embodiment of the present invention.

Fig. 5 shows a first modified embodiment of the display image detection apparatus according to the above-described second embodiment of the present invention.

Fig. 6 shows a second modified embodiment of the display image detection apparatus according to the above-described second embodiment of the present invention.

Fig. 7 shows a third modified embodiment of the display image detection apparatus according to the above-described second embodiment of the present invention.

Fig. 8 shows a fourth modified embodiment of the display image detection apparatus according to the above-described second embodiment of the present invention.

Fig. 9 shows a fifth modified embodiment of the display image detection apparatus according to the above-described second embodiment of the present invention.

Fig. 10 shows a sixth modified embodiment of the display image detection apparatus according to the above-described second embodiment of the present invention.

Detailed Description

The following description is presented to disclose the utility model so as to enable any person skilled in the art to practice the utility model. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the utility model, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.

In the present invention, the terms "a" and "an" in the claims and the description should be understood as meaning "one or more", that is, one element may be one in number in one embodiment, and the element may be more than one in number in another embodiment. The terms "a" and "an" should not be construed as limiting the number unless the number of such elements is explicitly recited as one in the present disclosure, but rather the terms "a" and "an" should not be construed as being limited to only one of the number.

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In recent years, emerging AR/VR technology (i.e., near-eye display technology) requires a new method, including new methods, software algorithms or systems, etc., for display testing. While some previous techniques have attempted to meet the unique testing criteria of near-eye displays, there have been significant limitations in fully addressing all measurable near-eye display characteristics. In order to solve various problems existing in the traditional measuring method, the imaging light path and the luminosity and chromaticity detection light path are matched with a reasonable optical device for use, so that accurate and comprehensive near-to-eye display measurement is realized.

Referring to fig. 1 and 2 of the drawings, a display image detection apparatus according to a first embodiment of the present invention is illustrated. Specifically, the display image detection apparatus 1 may include a light splitting component 10, a detection lens 20, an imaging detection component 30, and a color detection component 40. The light splitting component 10 defines a common detection light path 100, an imaging detection light path 101, and a color detection light path 102, and is configured to split the image light to be detected transmitted along the common detection light path 100 into a split light beam transmitted along the imaging detection light path 101 and a split light beam transmitted along the color detection light path 102. The detection lens 20 includes a front diaphragm 21 and a lens group 22, which are sequentially arranged on the common detection optical path 100 of the light splitting assembly 10, and is configured to transmit the image light to be detected, which is transmitted along the common detection optical path 100, to the light splitting assembly 10 sequentially through the front diaphragm 21 and the lens group 22. The imaging detection assembly 30 is correspondingly disposed in the imaging detection optical path 101 of the light splitting assembly 10, and is configured to receive the split light beam propagating along the imaging detection optical path 101 for performing a measurement related to imaging performance. The color detection assembly 40 is correspondingly disposed in the color detection optical path 102 of the light splitting assembly 10 for receiving the split light beam propagating along the color detection optical path 102 for photometric and colorimetric related measurements. It is understood that the image light to be measured comes from the near-eye display to be measured so as to detect the display performance of the near-eye display.

It should be noted that, since the display image detection apparatus 1 of the present application can represent the characteristics of human eyes through the detection lens 20, and combine the light splitting assembly 10 to form a dual light path detection system, so that the same path of image light to be detected can be split into two paths of light, wherein one path of light can implement the measurement related to the imaging performance to capture the image equivalent to the image seen by human eyes in details and definition for the same quality determination, and the other path of light can implement the measurement related to the photometric chromaticity (i.e. color) to accurately measure the key brightness and chromaticity information on the display image, the display image detection apparatus 1 can not only perfectly and comprehensively represent the performance of the display image, but also can effectively avoid the problems existing in the conventional image detection system. In other words, the display image detection apparatus 1 of the present application integrates and uses an imaging detection system and a photometric/colorimetric detection system by reasonable optical devices, so as to accurately and comprehensively perform near-eye display measurement.

More specifically, as shown in fig. 1 and 2, the light splitting assembly 10 of the display image detection apparatus 1 can be, but is not limited to, implemented as a light splitting prism 11, wherein the light splitting prism 11 is configured to split the image light to be detected propagating along the common detection optical path 100 into a sub-beam propagating along the imaging detection optical path 101 and a sub-beam propagating along the color detection optical path 102.

Illustratively, as shown in fig. 1 and 2, the beam splitting prism 11 may include, but is not limited to, a first prism 111, a second prism 112, and a beam splitting element 113, wherein the first prism 111 and the second prism 112 are correspondingly arranged in a slope-to-slope manner, and the beam splitting element 113 is disposed between the slope of the first prism 111 and the slope of the second prism 112, wherein the beam splitting element 113 is configured to reflect a portion of the light beams of the image light to be measured and transmit another portion of the light beams of the image light to be measured.

In an example of the present application, the beam splitting element 113 of the beam splitting prism 11 is implemented as a beam splitting film for splitting the image light to be measured into two beams. For example, the light splitting film may be implemented as, but not limited to, a polarization splitting film or a depolarizing splitting film. It is understood that the light splitting element 113 may be plated on the inclined surface of the first prism 111 or the second prism 112, or may be disposed between the inclined surface of the first prism 111 and the inclined surface of the second prism 112 by gluing.

Of course, in other examples of the present application, the beam splitting element 113 of the beam splitting prism 11 may also be implemented as a part of a transflective film for reflecting one part of the image light to be measured and transmitting another part of the image light to be measured. It is understood that the light splitting element 113 can split the light according to a certain ratio, for example, the partially reflective and semi-transmissive film can be, but is not limited to being, implemented as a semi-reflective and semi-transmissive film, and is used for reflecting 50% of the image light to be measured and transmitting 50% of the image light to be measured.

Preferably, the first prism 111 and the second prism 112 of the light splitting prism 11 may be implemented as right-angle prisms, and the size and shape of the first prism 111 and the second prism 112 are preferably kept the same, so that the light splitting prism 11 having a rectangular structure is assembled by the first prism 111 and the second prism 112, so that the image detection optical path 101 is perpendicular to the color detection optical path 102, which helps to reduce the assembly difficulty and the optical path design difficulty of the light splitting assembly 10. It is understood that in an example of the present application, the common detection optical path 100 of the light splitting assembly 10 may be perpendicular to the color detection optical path 102 and parallel to the image detection optical path 101; alternatively, in another example of the present application, the common detection optical path 100 of the light splitting assembly 10 may be perpendicular to the image detection optical path 101 and parallel to the color detection optical path 102.

It should be noted that, since the aperture that copies the size of the pupil of the human eye can capture the display light equivalent to the human eye, and the size of the pupil of the human eye changes with the human eye in the environment with a large difference between the brightness and the darkness, the matching and the size of the aperture that is suitable are very important for copying the entrance pupil of the human eye in the near-eye display. Based on this, the front diaphragm 21 in the detection lens 20 of the display image detection apparatus 1 according to the above-described first embodiment of the present application preferably has an adjustable aperture to be implemented as an iris, wherein the front diaphragm 21 is located at the foremost end of the detection lens 20 for effectively adjusting the aperture size of the detection lens 20.

It will be appreciated that the front stop 21 of the detection lens 20 of the present application is located at the foremost end of the detection lens 20, unlike the conventional lens in which the aperture is located inside the lens, so as to accurately reproduce the position of the human eye in the near-eye display, so that the captured display image is not obstructed or disturbed. Meanwhile, the size of the front diaphragm 21 may be adjusted (e.g., 1.5mm to 8mm), and particularly, the size of the diaphragm may be adjusted in an adaptive manner in conjunction with the determination of the intensity of the image light to be measured.

More preferably, the detection lens 20 may be implemented as a diopter adjustable lens, so that the display image detection apparatus 1 is compatible with the measurement of diopter adjustable near-eye displays. It should be noted that, in an example of the present application, the lens group 22 of the detection lens 20 may include at least one liquid lens to achieve diopter adjustment. Of course, in other examples of the present application, the detection lens 20 may further include at least one moving component, wherein the moving component is used to move a part of the lenses in the lens group 22 to mechanically achieve diopter adjustment.

It will be appreciated that the inspection lens 20 of the present application has sufficient resolution to capture all of the detail in the displayed image to enable pixel level defect detection. Meanwhile, the detection lens is implemented as a diopter adjustable lens, and a diopter adjusting function (for example, +/-10D) in a large range can be realized, so that image detection compatible with a near-eye display with diopter adjustment is achieved.

In addition, this application detection camera lens 20 also can be driven by the arm in order to carry out movements such as translation or rotation to scan the measurement with each field of view of the display image that awaits measuring, this solves some near-to-eye display that awaits measuring to the too high field of view demand of detection camera lens to a certain extent, with reduce effectively the volume and the design pressure of detection camera lens, the actual measurement of being convenient for is used.

According to the first embodiment of the present application, as shown in fig. 1 and 2, the imaging detection assembly 30 may include an image sensor 31, wherein the image sensor 31 is configured to receive the sub-beams propagating along the imaging detection optical path 101 to obtain image information, so as to achieve measurement of imaging performance related indicators such as sharpness, field angle, distortion, and the like. It is understood that the image sensor 31 may be, but is not limited to being, implemented as a photo-sensing chip.

According to the first embodiment of the present application, as shown in fig. 1 and 2, the color detection assembly 40 may include a photometric/colorimetric sensor 41, a relay lens 42 and a field stop 43, wherein the field stop 43, the relay lens 42 and the photometric/colorimetric sensor 41 are sequentially and correspondingly disposed in the color detection optical path 102 of the light splitting assembly 10. In other words, the color detection assembly 40 includes the field stop 43, the relay lens 42 and the photometric/colorimetric sensor 41 sequentially arranged along the color detection optical path 102, so that the sub-beams propagating along the color detection optical path 102 sequentially pass through the field stop 43 and the relay lens 42, and are then received by the photometric/colorimetric sensor 41 to obtain photometric/colorimetric information, thereby realizing accurate measurement of luminance and colorimetric values of a displayed image.

It should be noted that the field stop 43 of the color detection assembly 40 is preferably disposed at an intermediate image plane of the optical system formed by the light splitting assembly 10 and the detection lens 20 for field selection and filtering, so that light rays within a certain selected field angle range continue to propagate along the color detection optical path 102 to reach the photometric/colorimetric sensor 41 for receiving.

More preferably, the field stop 43 also has an adjustable aperture to allow selection of the field of view, such as ± 1 °, etc., to the photometric and colorimetric sensors 41.

According to the above-described first embodiment of the present application, the relay lens 42 of the color detection assembly 40 may be, but is not limited to being, implemented as a single-piece lens as shown in fig. 1. Of course, in other examples of the present application, the relay lens 42 may also be implemented as a lens group composed of multiple lenses.

Further, the photometric and colorimetric sensor 41 may be, but is not limited to being, implemented as a spectrometer to perform photometric and colorimetric measurements.

It is worth mentioning that according to the above-described first embodiment of the present application, the field stop 43 preferably coincides with the focal plane of the relay lens 42.

Exemplarily, in an example of the present application, as shown in fig. 1 and fig. 2, the color detection assembly 40 may further include a rear diaphragm 44, wherein the rear diaphragm 44 is disposed in an optical path between the relay lens 42 and the photometric/colorimetric sensor 41, and the rear diaphragm 44 and the front diaphragm 21 are in an object-image conjugate relationship with respect to an optical system composed of the lens group 22, the light splitting assembly 10, and the relay lens 42. It will be appreciated that in this example of the present application, the relay lens 42 of the color detection assembly 40 is implemented as a collimating lens for collimating the sub-beams propagating along the color detection light path 102 into parallel beams for propagating to the photometric and colorimetric sensors 41.

It should be noted that, although the display image detection apparatus 1 of the first embodiment is described above with the light splitting assembly 10 implemented as the light splitting prism 11 as an example to illustrate the advantages thereof, the light splitting assembly 10 is not limited to the light splitting structure of the light splitting prism 11, and in other examples of the present application, the light splitting assembly 10 may also be implemented as other types of light splitting structures such as a light splitting plate, a light splitting film, or a light splitting mirror.

Fig. 3 shows, by way of example, a variant of the display image detection device 1 according to the first embodiment of the utility model described above. Compared to the above-described first embodiment according to the utility model, the variant embodiment according to the utility model differs in that: the light splitting assembly 10 can be implemented as a light splitting plate 12, wherein the light splitting plate 12 includes a transparent substrate 121 and the light splitting element 113, and the light splitting element 113 is disposed on the surface of the transparent substrate 12, and is configured to reflect a portion of the light beam of the image light to be measured and transmit another portion of the light beam of the image light to be measured.

It should be noted that, since the weight of the light-transmitting substrate 121 of the beam splitter 12 is much smaller than the sum of the weights of the first prism 111 and the second prism 112 of the beam splitter 11, the weight of the display image detection apparatus 1 according to this modified embodiment of the present application is greatly reduced.

Preferably, the light-transmitting substrate 121 of the spectroscopic plate 12 is implemented as a flat plate, and the spectroscopic element 113 is formed on a flat surface of the light-transmitting substrate 121.

Further, the photometric and colorimetric sensor 41 of the color detecting means 40 is preferably located at the back focal point of the optical system composed of the lens group 22, the light splitting means 10 and the relay lens 42, and the field stop 43 and the photometric and colorimetric sensor 41 are in an object-image conjugate relationship with each other with respect to the relay lens 42. It is understood that in this variant embodiment of the present application, the relay lens 42 is implemented as a focusing lens, so that the sub-beams propagating along the color detection optical path 102 are focused on the photometric/colorimetric sensor 41 by the relay lens 42, so that the color detection assembly 40 may not include the rear diaphragm 44, and still enable the photometric/colorimetric sensor 41 to better receive the sub-beams propagating along the color detection optical path 102.

It is to be noted that although the relay lens 42 in the display image detection apparatus 1 according to the above-described modified embodiment of the present application is implemented as a focusing lens so as to omit the rear diaphragm 44, the relay lens 42 may be implemented as a collimating lens in other examples of the present application. In other words, in an example of the present application, when the light splitting assembly 10 is implemented as the light splitting plate 12, the relay lens 42 may be implemented as a collimating lens, and the color detection assembly 40 includes the rear diaphragm 44; alternatively, in another example of the present application, when the beam splitting assembly is implemented as the beam splitting prism 11, the relay lens 42 may also be implemented as a focusing lens to omit the rear diaphragm 44.

It should be noted that, since the common detection optical path 100 in the display image detection apparatus 1 according to the first embodiment of the present application is generally a straight optical path and is parallel to the image detection optical path 101, so that the display image detection apparatus 1 can only receive and detect the image light to be measured which propagates along the length direction of the display image detection apparatus 1, the display image detection apparatus 1 will easily interfere with the housing or other structural members of the near-eye display to be measured, and the measurement cannot be performed smoothly. In order to solve the problem, the application further provides another display image detection device, which flexibly adapts to the actual detection requirement by adjusting the specific arrangement form of the optical path.

Referring to fig. 4 of the drawings, a display image detection apparatus according to a second embodiment of the present invention is illustrated. Specifically, the display image detection apparatus 1 according to the second embodiment of the present application is different in that, compared to the above-described first embodiment of the present application: the detecting lens 20 may further include a turning prism 23, wherein the turning prism 23 is disposed in the optical path between the front stop 21 and the lens assembly 22 for turning the common detecting optical path 100 of the light splitting assembly 10, so as to effectively adjust the tube tilt angle of the detecting lens 20, thereby effectively reducing or avoiding the structural interference between the display image detecting apparatus 1 and the near-eye display, and making the measurement proceed smoothly. It can be understood that, by disposing the turning prism 23 between the front diaphragm 21 and the lens group 22, the aperture of the light entering the lens group 22 from the front diaphragm 21 can be greatly compressed, effectively reducing the size of the front end of the lens.

For example, as shown in fig. 4, the turning prism 23 may have an incident surface 231 facing the front stop 21, a first reflecting surface 232 and an exit surface 233 facing the lens set 22, so that the image light to be measured passing through the front stop 21 is incident into the turning prism 23 through the incident surface 231, and then reflected by the first reflecting surface 232 to change the propagation direction, and then exits from the exit surface 233 to propagate to the lens set 22.

Preferably, the first reflecting surface 232 of the turning prism 23 is implemented as a total reflecting surface, so that the image light to be measured entering from the incident surface 231 can be totally reflected at the first reflecting surface 232 to exit from the exit surface 233 after changing the propagation direction of the image light to be measured. Of course, in other examples of the present application, the first reflecting surface 232 of the turning prism 23 may also be implemented as a functional surface to realize the function of reflecting the image light to be measured by providing a reflecting element such as a high-reflection film or a reflective coating on the first reflecting surface 232 of the turning prism 23.

More preferably, an included angle between a normal line of the incident surface 231 of the turning prism 23 and a normal line of the exit surface 232 of the turning prism 23 satisfies a total reflection condition, so that the image light to be measured vertically incident from the incident surface 231 can be totally reflected once at the first reflection surface 232 to be vertically emitted from the exit surface 233 after changing the propagation direction of the image light to be measured.

It should be noted that, in other examples of the present application, the turning prism 23 may also have other shapes or structural forms, so as to flexibly and effectively adjust the inclination angle of the lens barrel of the detection lens 20, thereby better adjusting the specific arrangement form of the detection optical path to meet the requirements of various overall configurations.

Fig. 5 shows, by way of example, a first variant of the display image detection device 1 according to the above-described second embodiment of the utility model. Compared to the above-described second embodiment according to the utility model, the first variant embodiment according to the utility model differs in that: the turning prism 23 may further have a second reflection surface 234, wherein the second reflection surface 234 of the turning prism 23 is disposed opposite to the first reflection surface 232 of the turning prism 23, and is configured to make the image light to be measured incident from the incident surface 231 firstly reflect via the first reflection surface 232 to change the propagation direction of the image light to be measured for the first time, then reflect via the second reflection surface 234 to change the propagation direction of the image light to be measured again, and finally exit from the exit surface 233 to propagate to the lens assembly 22.

It is to be noted that, although in this modified embodiment of the present application, the image light to be measured undergoes total reflection twice at the first reflecting surface 232 and the second reflecting surface 234 in sequence, in other examples of the present application, the image light to be measured undergoes total reflection twice or more at the first reflecting surface 232 and the second reflecting surface 234 in sequence, so as to change the propagation direction of the image light to be measured multiple times.

Preferably, the incident surface 231 of the turning prism 23 is parallel to the emergent surface 232 of the turning prism 23, so that the display image detection apparatus 1 can detect the image light to be measured propagating along the length direction of the display image detection apparatus 1 with a dislocation.

More preferably, an included angle between the first reflecting surface 232 of the turning prism 23 and the incident surface 231 of the turning prism 23 is an acute angle, and the first reflecting surface 232 of the turning prism 23 faces the direction of the color detection assembly 40, so as to reduce the overall height of the display image detection apparatus 1.

Most preferably, corners of the bending prism 23 adjacent to the incident surface 231 and the second reflecting surface 234 are cut off to minimize the area of the incident surface 231 of the bending prism 23, so that the size of the front end of the detection lens 20 is further reduced.

Fig. 6 shows a second modified embodiment of the display image detection apparatus 1 according to the above-described second embodiment of the present invention. Compared to the above-described first variant embodiment according to the utility model, the second variant embodiment according to the utility model differs in that: the first reflecting surface 232 of the turning prism 23 can face away from the color detection assembly 40 to increase the distance between the front diaphragm 21 and the color detection assembly 40 in the height direction, so as to avoid the color detection assembly 40 of the display image detection apparatus 1 from structurally interfering with the near-eye display.

It should be noted that, although the arrangement of the front-end optical path in the display image detection apparatus 1 is adjusted according to the second embodiment and the above modified embodiments of the present application to reduce or avoid the structural interference between the front-end structure of the display image detection apparatus 1 and the near-eye display, in other examples of the present application, the display image detection apparatus 1 may also adjust the arrangement of the rear-end optical path to flexibly adapt to the requirements of various types of overall configuration structures.

Fig. 7 shows, by way of example, a third variant of the display image detection device 1 according to the above-described second embodiment of the utility model. Compared to the above-described second embodiment according to the utility model, the third variant embodiment according to the utility model differs in that: the color detecting assembly 40 may further include a reflective element 45, wherein the reflective element 45 is disposed in the optical path between the field stop 43 and the relay lens 42 for reflectively turning the color detecting optical path 102 of the light splitting assembly 10, so that the sub-beams passing through the field stop 43 are reflected by the reflective element 45 to change the propagation direction, and then sequentially pass through the relay lens 42 and the rear stop 44 to reach the photometric/colorimetric sensor 41 to be received.

It is to be noted that, in this modified embodiment of the present application, the reflecting member 45 can fold the color detection optical path 102 to effectively fold the length of the color detection optical path 102 in the height direction, effectively compressing the volume of the display image detection apparatus 1.

Preferably, the reflection surface of the reflection element 45 is parallel to the beam splitter element 113 of the beam splitter prism 11, so that the photometric and colorimetric sensors 41 of the color detection assembly 40 are located at the rear end of the display image detection apparatus 1 as well as the image sensor 31, which helps to greatly reduce the height of the display image detection apparatus 1.

It is noted that in an example of the present application, the reflective element 45 may be implemented as a plane mirror; of course, in other examples of the present application, the reflective element 45 may also be implemented as a curved mirror. Furthermore, the reflective element 45 may also be implemented as other types of reflective elements, such as a total reflection prism.

Fig. 8 shows a fourth modified embodiment of the display image detection apparatus 1 according to the above-described second embodiment of the present invention. Compared to the above-described second variant embodiment according to the utility model, said fourth variant embodiment according to the utility model differs in that: the light splitting assembly 10 may include a special-shaped light splitting prism 13, wherein the special-shaped light splitting prism 13 has a light incident surface 131 facing the detection lens 20, a light splitting surface 132 facing the color detection assembly 40, and a light emitting surface 133 facing the imaging detection assembly 30, wherein the light incident surface 131, the light splitting surface 132, and the light emitting surface 133 of the special-shaped light splitting prism 13 are not parallel to each other, and the light splitting surface 132 of the special-shaped light splitting prism 13 is configured to split the image light to be detected incident from the light incident surface 131 into a beam splitting light transmitted by the light splitting surface 132 and a beam splitting light reflected by the light emitting surface 133.

Thus, the image light to be detected passing through the detection lens 20 firstly enters the special-shaped beam splitter prism 13 from the light incident surface 131 of the special-shaped beam splitter prism 13, and is then split into the beam splitting light transmitted by the beam splitting surface 132 and the beam splitting light reflected by the light emitting surface 133 by the beam splitting surface 132 of the special-shaped beam splitter prism 13, and finally the beam splitting light transmitted by the beam splitting surface 132 is transmitted to the color detection assembly 40 to be received, and the beam splitting light reflected by the light emitting surface 133 is emitted from the light emitting surface 133 of the special-shaped beam splitter prism 13 to be received by the imaging detection assembly 30.

Specifically, the special-shaped beam splitter prism 13 may include a special-shaped prism 130 and the beam splitter 113, where the beam splitter 113 is correspondingly disposed on a side surface of the special-shaped prism 130 corresponding to the color detection assembly 40 to form the beam splitting surface 132 of the special-shaped beam splitter prism 13, and is configured to reflect a part of the light beam of the image light to be measured and transmit another part of the light beam of the image light to be measured.

Preferably, the light incident surface 131 of the special-shaped beam splitter prism 13 is arranged opposite to the beam splitting surface 132 of the special-shaped beam splitter prism 13, so as to further reduce the overall height of the display image detection apparatus 1.

Fig. 9 shows a fifth modified embodiment of the display image detection apparatus 1 according to the above-described second embodiment of the present invention. Compared to the above-described fourth variant embodiment according to the utility model, said fifth variant embodiment according to the utility model differs in that: the special-shaped light splitting prism 13 further has a light reflecting surface 134, wherein the light reflecting surface 134 of the special-shaped light splitting prism 13 is disposed opposite to the light incident surface 131 of the special-shaped light splitting prism 13, and is configured to reflect the image light to be measured incident from the light incident surface 131 to the light splitting surface 132. It is understood that the reflection function of the reflection surface 134 of the special-shaped beam splitter prism 13 can be realized by, but not limited to, a reflection coating or total reflection.

And the splitting plane 132 and the light emitting plane 133 of the special-shaped splitting prism 13 are respectively located at the adjacent sides of the light incident plane 131 of the special-shaped splitting prism 13. Thus, the image light to be detected passing through the detection lens 20 is incident into the special-shaped beam splitter prism 13 from the light incident surface 131 of the special-shaped beam splitter prism 13, then is reflected by the light reflecting surface 134 of the special-shaped beam splitter prism 13 to be transmitted to the light splitting surface 132 of the special-shaped beam splitter prism 13, and then is split into the beam splitting light transmitted by the light splitting surface 132 and the beam splitting light reflected by the light emitting surface 133 through the light splitting surface 132 of the special-shaped beam splitter prism 13, and finally the beam splitting light transmitted by the light splitting surface 132 is transmitted to the color detection assembly 40 to be received, and the beam splitting light reflected by the light emitting surface 133 is emitted from the light emitting surface 133 of the special-shaped beam splitter prism 13 to be received by the imaging detection assembly 30.

Fig. 10 shows a sixth modified embodiment of the display image detection apparatus 1 according to the above-described second embodiment of the present invention. Compared to the above-described fifth variant embodiment according to the utility model, the sixth variant embodiment according to the utility model differs in that: the light splitting assembly 10 may further include an additional reflection prism 14, wherein the additional reflection prism 14 is correspondingly disposed in a light path between the light splitting surface 132 of the irregular-shaped light splitting prism 13 and the color detection assembly 40, and is configured to reflectively turn the color detection light path 102, so that the split light beams transmitted from the light splitting surface 132 are reflected by the additional reflection prism 14 and then transmitted to the color detection assembly 40 to be received, and the arrangement of the rear end light path of the display image detection apparatus 1 is more flexible, so as to be convenient for adapting to the requirements of the overall configuration structure.

Preferably, the side surface of the additional reflection prism 14 is attached to the light splitting surface 132 of the special-shaped light splitting prism 13, so as to prevent the image light to be measured from being totally reflected at the light splitting surface 132 of the special-shaped light splitting prism 13, and to help ensure that the light splitting surface 132 of the special-shaped light splitting prism 13 works normally.

It should be noted that in other examples of the present application, the specific structure of the display image detection apparatus 1 may also be assembled according to the type and structure of the near-eye display to be measured, which is not described in detail herein. Further, it will be understood by those skilled in the art that the type of the near-eye display is not limited, for example, the near-eye display may be a near-eye display device such as AR glasses, VR glasses, or the like.

It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are given by way of example only and are not limiting of the utility model. The objects of the utility model have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims (17)

1. A display image detection apparatus, comprising:

the system comprises a light splitting component, a light source module and a light source module, wherein the light splitting component defines a common detection light path, an imaging detection light path and a color detection light path and is used for splitting the light of an image to be detected transmitted along the common detection light path into a split beam transmitted along the imaging detection light path and a split beam transmitted along the color detection light path;

the detection lens comprises a front diaphragm and a lens group which are sequentially arranged along the common detection light path, and is used for enabling the image light to be detected transmitted along the common detection light path to sequentially pass through the front diaphragm and the lens group and then be transmitted to the light splitting component;

an imaging detection assembly, wherein the imaging detection assembly is correspondingly disposed in the imaging detection optical path and is used for receiving the sub-beam propagating along the imaging detection optical path to perform measurement related to imaging performance; and

a color detection assembly, wherein the color detection assembly is disposed in the color detection optical path, respectively, for receiving the sub-beams propagating along the color detection optical path to perform photometric and colorimetric related measurements.

2. The displayed image detection apparatus according to claim 1, wherein the light-splitting component is a light-splitting prism, wherein the light-splitting prism includes a first prism, a second prism, and a light-splitting element, wherein the first prism and the second prism are oppositely arranged in an inclined surface-to-inclined surface manner, and the light-splitting element is provided between the inclined surface of the first prism and the inclined surface of the second prism, and is configured to reflect a part of the light beam of the image light to be measured and transmit another part of the light beam of the image light to be measured.

3. The display image detection apparatus according to claim 1, wherein the light splitting element is a light splitting plate, wherein the light splitting plate includes a transparent substrate and a light splitting element, and wherein the light splitting element is disposed on a surface of the transparent substrate, and is configured to reflect a portion of the light beam of the image light to be detected and transmit another portion of the light beam of the image light to be detected.

4. The display image detection apparatus according to claim 1, wherein the light splitting assembly includes a special-shaped light splitting prism, wherein the special-shaped light splitting prism has an incident surface facing the detection lens, a splitting surface facing the color detection assembly, and an exit surface facing the imaging detection assembly, wherein the incident surface, the splitting surface, and the exit surface of the special-shaped light splitting prism are not parallel to each other, and the splitting surface of the special-shaped light splitting prism is configured to split the image light to be detected incident from the incident surface into split light transmitted by the splitting surface and split light reflected by the splitting surface.

5. The displayed image detection apparatus according to claim 4, wherein the special-shaped beam splitter prism includes a special-shaped prism and a beam splitter element, wherein the beam splitter element is correspondingly disposed on a side surface of the special-shaped prism corresponding to the color detection assembly to form the beam splitting surface of the special-shaped beam splitter prism, and is configured to reflect a part of the light beam of the image light to be detected and transmit another part of the light beam of the image light to be detected.

6. The displayed image detection apparatus according to claim 5, wherein the special-shaped light splitting prism further has a light reflecting surface, wherein the light reflecting surface of the special-shaped light splitting prism is disposed opposite to the light incident surface of the special-shaped light splitting prism, and is configured to reflect the image light to be measured incident from the light incident surface to the light splitting surface.

7. The display image detection apparatus according to claim 6, wherein the light splitting assembly further comprises an additional reflection prism, wherein the additional reflection prism is correspondingly disposed between the light splitting surface of the shaped light splitting prism and the color detection assembly, for reflectively turning the color detection light path.

8. The display image detection apparatus according to claim 6, wherein the spectroscopic element is a polarization spectroscopic film or a partially reflective film.

9. The display image detection apparatus according to any one of claims 1 to 8, wherein the color detection assembly includes a field stop, a relay lens, and a photometric/colorimetric sensor arranged in this order along the color detection optical path, for causing the divided light beams propagating along the color detection optical path to pass through the field stop and the relay lens in this order, and then to be received by the photometric/colorimetric sensor to obtain photometric/colorimetric information.

10. The display image detection apparatus according to claim 9, wherein the field stop is provided at an intermediate image plane of an optical system constituted by the light splitting assembly and the detection lens.

11. The display image detection apparatus according to claim 10, wherein the color detection section further comprises a rear diaphragm, wherein the rear diaphragm is disposed correspondingly in an optical path between the relay lens and the photometric/colorimetric sensor, and the rear diaphragm and the front diaphragm are in an object-image conjugate relationship with respect to an optical system composed of the lens group, the light splitting section, and the relay lens.

12. The display image detection apparatus according to claim 10, wherein the photometric/colorimetric sensor is located at a back focus of an optical system composed of the lens group, the light splitting assembly, and the relay lens, and the field stop and the photometric/colorimetric sensor are in an object-image conjugate relationship with respect to the relay lens.

13. The display image detection apparatus according to claim 9, wherein the color detection apparatus further comprises a reflection element, wherein the reflection element is provided in an optical path between the field stop and the relay lens, respectively, for reflectively deflecting the color detection optical path.

14. The display image detection apparatus according to any one of claims 1 to 7, wherein the detection lens further comprises a turning prism, wherein the turning prism is provided in an optical path between the front stop and the lens group, for turning the common detection optical path.

15. The display image inspection device according to claim 14, wherein the bending prism has an incident surface facing the front stop, a first reflecting surface, and an exit surface facing the lens group, and is configured such that the image light to be inspected passing through the front stop is first incident into the bending prism via the incident surface, and then reflected by the first reflecting surface to change the propagation direction, and then exits from the exit surface to propagate to the lens group.

16. The displayed image detection apparatus according to claim 15, wherein the turning prism further has a second reflection surface, wherein the second reflection surface of the turning prism is disposed opposite to the first reflection surface of the turning prism, and is configured to allow the image light to be measured incident from the incident surface to be reflected by the first reflection surface to change the propagation direction for the first time, and then to be reflected by the second reflection surface to change the propagation direction again, and then to be emitted from the exit surface to be propagated to the lens group.

17. The display image detection apparatus according to any one of claims 1 to 7, wherein the front diaphragm has an adjustable aperture to form an iris diaphragm, and the detection lens is a diopter-adjustable lens.

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