Detection equipment and detection method of near-to-eye display device

Abstract

The invention discloses a near-eye display device detection apparatus and a detection method, suitable for detecting a near-eye display device comprising a lens module and a projection device, the lens module comprises a development area, the projection device is assembled on the lens module, and the detection method comprises the following steps: providing the near-eye display device to a carrying platform on a transfer module, the near-to-eye display device is assembled on the detection jig, and the detection jig comprises a positioning part; the transfer module transfers the carrying table to one side of the posture detection module; the posture detection module detects the position of the positioning part on the detection jig and calculates the center of the development area according to the position of the positioning part; the transfer module transfers the carrying table to align the center of the development area to the image analysis module; the projection device outputs an image, and the image analysis module analyzes the image.

Description

Technical Field

[0001] The present invention relates to a detection device and a detection method for an optical device, and particularly to a detection device and a detection method for a near-eye display device. Background Art

[0002] A near-to-eye display device is a head-mounted display device in which the image display distance is less than the distance of distinct vision of the human eye. The near-to-eye display device mainly projects an image through a projection device, and then converts the image displayed by the display into a virtual image at a long distance through optical elements (such as a lens group or a waveguide element) for the human eye to view.

[0003] Based on this, since the distance between the image displayed by the near-to-eye display device and the human eye is quite close, the user can easily observe the quality of the image displayed by the near-to-eye display device. Therefore, the components and the assembled products of the near-to-eye display device must undergo precise quality inspection to ensure product quality. However, in the prior art, there is no device for detecting a near-to-eye display device, and it is usually relied on a large amount of manpower to complete. Not only can the detection accuracy not be controlled, but also a large amount of manpower and time-consuming cannot improve the detection efficiency, so there is room for improvement. Summary of the Invention

[0004] The present invention provides a detection device for a near-eye display device, which is suitable for detecting a near-eye display device including a lens module and a projection device. The lens module includes an imaging area, and the projection device is disposed on the lens module. The detection device includes a frame, a transfer module, a stage, a detection jig, an attitude detection module, an image analysis module, and a controller. The transfer module is disposed on the frame so as to be displaceable relative to the frame. The stage is disposed on the transfer module. The detection jig is disposed on the stage for carrying the near-eye display device and includes a positioning portion. The attitude detection module is disposed on the frame. The image analysis module is disposed on the frame. The controller is electrically connected to the transfer module, the attitude detection module, and the image analysis module. The controller controls the transfer module to transfer the stage to one side of the attitude detection module; the controller controls the attitude detection module to detect the position of the positioning portion and calculates the imaging area center of the imaging area according to the position of the positioning portion; the controller controls the transfer module to transfer the stage so that the imaging area center is aligned with the image analysis module; the controller controls the projection device to output an image and controls the image analysis module to analyze the image.

[0005] Thereby, the detection device for the near-eye display device can automatically detect the imaging area center of the near-eye display device through control, and align the imaging area center and the image analysis module according to the detection result. After the alignment is completed, an image is projected and image analysis is performed. The testing process is mainly automatically completed by the detection device, which can not only ensure the testing accuracy, but also greatly reduce the manpower requirement and improve the testing speed.

[0006] In some embodiments, the aforementioned near-eye display device has an eye relief distance (ERF); the controller controls the attitude detection module to detect the detection distance between the lens module and the image analysis module, and controls the transfer module to adjust the attitude of the stage so that the detection distance conforms to the eye relief distance.

[0007] In some embodiments, the aforementioned attitude detection module includes a telecentric measurement unit and a confocal measurement unit; the lens module is located between the confocal measurement unit and the image analysis module; the lens module includes a waveguide optical element; the controller controls the telecentric measurement unit to detect the position of the positioning portion; the controller controls the confocal measurement unit to detect the distance between the waveguide optical element of the lens module and the image analysis module as the detection distance.

[0008] In some embodiments, the aforementioned transfer module includes three linear displacement components and three rotational components. Each linear displacement component is overlapped and arranged on the frame along the Z-axis direction, and each rotational component is overlapped and arranged on each linear displacement component along the Z-axis direction.

[0009] In some embodiments, the aforementioned three linear displacement components include a first linear displacement component, a second linear displacement component, and a third linear displacement component. The first linear displacement component extends along the Y-axis direction, the second linear displacement component extends along the X-axis direction and can be displaced along the Y-axis direction with the first linear displacement component, and the third linear displacement component can be displaced along the X-axis with the second linear displacement component and can be displaced along the Z-axis direction relative to the second linear displacement component. Each rotational component is arranged on the third linear displacement component.

[0010] In some embodiments, the aforementioned three rotational components include a first rotational component, a second rotational component, and a third rotational component. The first rotational component is rotatably arranged on the third linear displacement component relative to the third linear displacement component around the Y-axis, the second rotational component is rotatably arranged on the first rotational component relative to the first rotational component around the X-axis, and the third rotational component is rotatably arranged on the second rotational component relative to the second rotational component around the Z-axis.

[0011] The present invention further provides a detection method for a near-eye display device, which is suitable for detecting a near-eye display device including a lens module and a projection device. The lens module includes an image display area, and the projection device is assembled on the lens module. The detection method includes: providing the near-eye display device to a stage on the transfer module, the near-eye display device is assembled on a detection fixture, and the detection fixture includes a positioning portion; the transfer module transfers the stage to one side of the attitude detection module; the attitude detection module detects the position of the positioning portion on the detection fixture, and defines the image display area center of the image display area according to the position of the positioning portion; the transfer module transfers the stage to align the image display area center with the image analysis module; and the projection device outputs an image, and the image analysis module analyzes the image.

[0012] In some embodiments, after aligning the foregoing image analysis module with the center of the imaging area, the attitude detection module detects the detection distance between the lens module and the image analysis module, and the transfer module adjusts the attitude of the stage so that the detection distance conforms to the proper eye distance of the near-eye display device.

[0013] In some embodiments, the foregoing attitude detection module includes a telecentric measurement unit and a confocal measurement unit; the telecentric measurement unit measures the positions of the positioning part in the X-axis direction and the Y-axis direction, and the controller calculates the center position of the image output part of the projection device based on the positions of the positioning part in the X-axis direction and the Y-axis direction, and then obtains the position of the center of the imaging area according to the center position of the image output part; the lens module includes a waveguide optical element; the confocal measurement unit detects the distance between the waveguide optical element of the lens module and the image analysis module in the Z-axis direction as the detection distance.

[0014] In some embodiments, the foregoing image analysis module analyzes at least one of the modulation transfer function curve (MTF), the field of view (FOV), the distance from the center of the image to the center of the field of view, the vertical and horizontal rotation angles of the image, the brightness uniformity of the image, the distortion rate of the image, the color uniformity of the image, the contrast of the image as a 4×4 checkerboard pattern, the contrast of the image as a 7×7 checkerboard pattern, and the contrast between the pure color and the dark field of the image. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a three-dimensional external view schematic diagram of an embodiment of the detection device for a near-eye display device of the present invention;

[0016] Figure 2 FIG. is a plan view schematic diagram of an embodiment of the near-eye display device;

[0017] Figure 3 FIG. is a partial schematic diagram of a detection jig group of an embodiment of the detection device for a near-eye display device of the present invention provided with a near-eye display device;

[0018] Figure 4 FIG. is a partial schematic diagram of an embodiment of the detection device for a near-eye display device of the present invention detecting the near-eye display device;

[0019] Figure 5 FIG. is a schematic diagram of a stage and a detection jig of an embodiment of the detection device for a near-eye display device of the present invention;

[0020] Figure 6 FIG. is a partial structural schematic diagram of a transfer module of an embodiment of the detection device for a near-eye display device of the present invention;

[0021] Figure 7 Schematic diagram of the partial structure of the transfer module of an embodiment of the detection device for the near-eye display device of the present invention;

[0022] Figure 8 Stereogram of the detection jig of an embodiment of the detection device for the near-eye display device of the present invention;

[0023] Figure 9 Planar schematic diagram of the detection jig of an embodiment of the detection device for the near-eye display device of the present invention;

[0024] Figure 10 Flow chart of the steps of an embodiment of the detection method for the near-eye display device of the present invention;

[0025] Figure 11A Optical wave signal diagram generated by measurement by the conjugate focus measurement unit of an embodiment of the detection device for the near-eye display device of the present invention;

[0026] Figure 11B Corresponding to Figure 11A Schematic diagram of the measurement position;

[0027] Figure 12 Schematic diagram of another embodiment of the detection device for the near-eye display device of the present invention;

[0028] Wherein, reference numerals:

[0029] 10: Frame;

[0030] 20: Transfer module;

[0031] 21: Linear displacement component;

[0032] 21A: First linear displacement component;

[0033] 211A: First linear guiding component;

[0034] 212A: First slide;

[0035] 21B: Second linear displacement component;

[0036] 211B: Second linear guiding component;

[0037] 212B: Second slide;

[0038] 21C: Third linear displacement component;

[0039] 211C: Base;

[0040] 2111C: Bottom surface;

[0041] 2112C: Opening;

[0042] 212C: Slide cover;

[0043] 2121C: Against inclined plane;

[0044] 2122C: Bonding plane;

[0045] 213C: Driving structure;

[0046] 2131C: Driving inclined plane;

[0047] 214C: Driving source;

[0048] 22: Rotating assembly;

[0049] 22A: First rotating assembly;

[0050] 221A: First lower plate;

[0051] 2211A: First arc concave part;

[0052] 222A: First upper plate;

[0053] 2221A: First arc convex part;

[0054] 22B: Second rotating assembly;

[0055] 221B: Second lower plate;

[0056] 2211B: Second arc concave part;

[0057] 222B: Second upper plate;

[0058] 2221B: Second arc convex part;

[0059] 22C: Third rotating assembly;

[0060] 221C: Rotating shaft;

[0061] 222C: Turntable;

[0062] 30: Carrier;

[0063] 40: Detection fixture;

[0064] 41: Positioning part;

[0065] 411: First part;

[0066] 412: Second part;

[0067] 413: Middle partition surface;

[0068] 42: Assembly part;

[0069] 421: Through hole;

[0070] 422: Side wall;

[0071] 43: First surface;

[0072] 44: Second surface;

[0073] 50: Attitude detection module;

[0074] 51: Telecentric measurement unit;

[0075] 52: Confocal measurement unit;

[0076] 60: Image analysis module;

[0077] 70: Controller;

[0078] 80: Scanning module;

[0079] P: Projection device;

[0080] P2: Outer surface;

[0081] G: Lens module;

[0082] G1: Eyepiece side;

[0083] G2: Outer side;

[0084] G3: Waveguide optical element;

[0085] G4: Display area;

[0086] G41: Center of display area;

[0087] X, Y, Z: Axes;

[0088] S01~S04: Steps;

[0089] Z1: First distance;

[0090] Z2: Second distance;

[0091] Z3: Third distance;

[0092] Z4: Fourth distance;

[0093] S1: First surface;

[0094] S2: Second surface;

[0095] S3: Third surface;

[0096] S4: Fourth surface;

[0097] S5: Fifth surface;

[0098] L1: First optical wavelength;

[0099] L2: Second optical wavelength;

[0100] L3: Third optical wavelength;

[0101] L4: Fourth optical wavelength;

[0102] L5: Fifth optical wavelength;

[0103] L12: First optical wavelength relationship;

[0104] L23: Second optical wavelength relationship;

[0105] L34: Third optical wavelength relationship;

[0106] L45: Fourth optical wavelength relationship. Detailed implementation manners

[0107] Before the detection device of the near-eye display device of the present invention is described in detail in various embodiments, it should be noted that in the following description, the drawings of the present invention are only for illustrative purposes, not necessarily drawn to scale, and not all details may be presented in the drawings.

[0108] Refer to Figure 1 and Figure 2 , Figure 1 is a three-dimensional external view schematic diagram of an embodiment of the detection device of the near-eye display device of the present invention; Figure 2 is a plan view schematic diagram of an embodiment of the near-eye display device.

[0109] In some embodiments, the near-eye display (NED) is, for example but not limited to, a virtual reality display (VR display), an augmented reality display (AR display), a mixed reality display (MR display), or an extended reality display (XR display). The near-eye display device that can be detected by the detection device of the near-eye display device of the present invention is described by taking the near-eye display device in the form of glasses as an example.

[0110] Refer to Figure 3 and Figure 4 , Figure 3 is a partial schematic diagram of the detection jig set of the detection device of the near-eye display device of the present invention provided with a near-eye display device; Figure 4FIG. 0 is a partial schematic view of a near-eye display device being detected by a detection device according to an embodiment of the present invention. In some embodiments, the near-eye display device includes a lens module G and a projection device P. It should be noted that here, the near-eye display device can be, in addition to a display module (Modular Display Assembly, MDA) that only includes the lens module G and the projection device P, also a semi-assembly that includes the lens module G, the projection device P, and a frame, or a full assembly that includes the lens module G, the projection device P, the frame, and temple arms.

[0111] Referring to Figures 1 to 4 , in some embodiments, the lens module G includes an opposite eye side G1 and an outer side G2, a waveguide optical element G3, and an imaging area G4. When the lens module G is applied to the near-eye display device, the eye side G1 is the side facing the user, and the outer side G2 is the side opposite to the eye side G1; the projection device P is assembled on the eye side G1, and after the waveguide optical element G3 receives the image signal from the projection device P, it conducts the signal to the imaging area G4 for imaging, and the imaging area G4 is located on the eye side G1.

[0112] Here, the optical principle applied by the near-eye display device is that the image output part of the projection device P projects an image signal at one end of the waveguide optical element G3. Based on the total internal reflection principle, the light is reflected and propagated within the waveguide optical element G3, and finally reflected out from the other end of the waveguide optical element G3 and imaged in the imaging area G4, and finally received by the user's eyes to view the image. In this state, the imaging area G4 has an imaging area center G41. When the user's eyes are aligned with the imaging area center G41 of the imaging area G4 and are spaced at an appropriate eye relief distance (ERF), the most perfect image can be obtained. The image quality of the image within the imaging area G4 but deviated from the imaging area center G41 gradually deteriorates, and the image outside the imaging area G4 has problems such as image distortion, color display error, and inability to image.

[0113] Therefore, an embodiment of the detection device of the near-eye display device of the present invention performs an image quality test (IQT) on the imaging area center G41 of the imaging area G4 of the near-eye display device to ensure that the imaging area center G41 of the imaging area G4 of the near-eye display device has the required image quality.

[0114] The projection device P is assembled on the lens module G and can output an optical image to project the image onto the target object. In some embodiments, the projection device P has a light source, a light valve, and a projection lens. The light source provides a light beam to the light valve to generate an image light beam, which is then transmitted to the projection lens to be projected onto the target object. The light source can be, but is not limited to, a diode light-emitting device. The light valve can be, but is not limited to, a liquid crystal panel (LCD), a liquid crystal on silicon panel (LCOS), or a digital micromirror device (DMD). The projection lens can include multiple lenses with diopters. In a specific embodiment, the light source of the projection device P is a light-emitting diode (LED) light source, and the projection device P is composed of a digital micromirror device and a projection lens composed of six lenses. In some embodiments, the projection device P is in the form of a polyhedron structure and includes an outer surface P2.

[0115] Referring to Figures 1 to 3 , the detection device of the near-eye display device includes a frame 10, a transfer module 20, a stage 30, a detection jig 40, an attitude detection module 50, an image analysis module 60, and a controller 70. The detection jig 40 carries the near-eye display device. The controller 70 controls the transfer module 20 to transfer the stage 30 and the detection jig 40 to one side of the attitude detection module 50, and then controls the attitude detection module 50 to find the center G41 of the imaging area G4 of the lens module G according to the features on the detection jig 40, and controls the image analysis module 60 to perform image analysis after aligning with the position of the imaging area center G41.

[0116] Referring to Figures 1 to 5 , Figure 5 is a schematic diagram of the stage and the detection jig of an embodiment of the detection device of the near-eye display device of the present invention. The transfer module 20 is disposed on the frame 10 so as to be displaceable relative to the frame 10. The stage 30 is disposed on the transfer module 20. The detection jig 40 is disposed on the stage 30 for carrying the near-eye display device, and the detection jig 40 includes a positioning portion 41. The attitude detection module 50 is disposed on the frame 10. The image analysis module 60 is disposed on the frame 10. The controller 70 is electrically connected to the transfer module 20, the attitude detection module 50, and the image analysis module 60.

[0117] The controller 70 controls the transfer module 20 to transfer the stage 30 and the detection jig 40 to one side of the attitude detection module 50; the controller 70 controls the attitude detection module 50 to detect the position of the positioning portion 41 and find the center G41 of the imaging area G4 according to the position of the positioning portion 41; the controller 70 controls the transfer module 20 to transfer the stage 30 and the detection jig 40 to align the imaging area center G41 with the image analysis module 60; the controller 70 controls the projection device P to output an image and display it on the imaging area G4, and controls the image analysis module 60 to analyze the image.

[0118] Thus, the detection device of the near-eye display device can automatically detect the center G41 of the imaging area of the near-eye display device through control, and align the center G41 of the imaging area and the image analysis module 60 according to the detection results. After the alignment is completed, the image is projected and the image analysis is performed. The testing process is mainly automatically completed by the detection device, which can not only ensure the testing accuracy, but also greatly reduce the manpower requirement and improve the testing speed.

[0119] Refer to Figure 1 , the frame 10 serves as the main support of the assembly device of the near-eye display device, and is used to support and maintain the required assembly work. The transfer module 20, the attitude detection module 50 and the image analysis module 60 are respectively arranged on the frame 10.

[0120] Refer to Figure 1 , the transfer module 20 serves as the main transfer device of the transfer stage 30 and the detection jig 40 in the assembly device of the near-eye display device, and is used to transfer the near-eye display device to the attitude detection and image analysis positions thereby.

[0121] Refer to Figure 1 and Figure 2 , the transfer module 20 includes a three-linear displacement component 21 and a three-rotation component 22. Each linear displacement component 21 is overlapped and arranged on the frame 10 along the Z-axis direction, and each rotation component 22 is overlapped on each linear displacement component 21 along the Z-axis direction. The three-linear displacement component 21 can generate displacements in three linear directions perpendicular to each other relative to the frame 10 respectively, and the three-rotation component 22 can generate rotational displacements that rotate around three different directions relative to the frame 10 respectively.

[0122] Refer to Figure 1 and Figure 2 , in some embodiments, the three-linear displacement component 21 includes a first linear displacement component 21A, a second linear displacement component 21B and a third linear displacement component 21C. The first linear displacement component 21A extends along the Y-axis direction, the second linear displacement component 21B extends along the X-axis direction and can displace along the Y-axis direction with the first linear displacement component 21A, and the third linear displacement component 21C can displace along the X-axis direction with the second linear displacement component 21B and can displace relative to the second linear displacement component 21B along the Z-axis direction. The aforementioned X-axis, Y-axis and Z-axis are perpendicular to each other. Thus, the three-linear displacement component 21 can transfer the stage 30 and the detection jig 40 to linearly displace along the X-axis direction, the Y-axis direction and the Z-axis direction.

[0123] Refer to Figure 1 and Figure 2In some embodiments, the first linear displacement component 21A includes a first linear guiding component 211A and a first sliding table 212A. The first linear guiding component 211A is disposed on the frame 10 extending along the Y-axis direction. The first sliding table 212A is slidably disposed on the first linear guiding component 211A and can slide along the Y-axis direction under the guidance of the first linear guiding component 211A.

[0124] Refer to Figure 1 and Figure 2 , the second linear displacement component 21B includes a second linear guiding component 211B and a second sliding table 212B. The second linear guiding component 211B is disposed on the first sliding table 212A extending along the X-axis direction to displace along the Y-axis direction with the first sliding table 212A. The second sliding table 212B is slidably disposed on the second linear guiding component 211B and can slide along the X-axis direction under the guidance of the second linear guiding component 211B. In some embodiments, the first linear guiding component 211A and the second linear guiding component 211B can be but are not limited to combinations of linear slide rails respectively.

[0125] Refer to Figure 1 , Figure 6 and Figure 7 , Figure 6 is a partial structural schematic diagram of a transfer module of an embodiment of a detection device for a near-eye display device of the present invention; Figure 7 is a partial structural exploded schematic diagram of a transfer module of an embodiment of a detection device for a near-eye display device of the present invention. In some embodiments, the third linear displacement component 21C includes a base 211C, a sliding cover 212C, and a driving structure 213C. The driving structure 213C is disposed inside the base 211C and can drive the sliding cover 212C to displace relative to the base 211C along the Z-axis direction.

[0126] Refer to Figure 6 and Figure 7, in some embodiments, the base 211C has a bottom surface 2111C and an opening 2112C relative to the bottom surface 2111C; the driving structure 213C is displaceably received in the base 211C along the Y-axis direction and has a driving inclined surface 2131C, and the driving inclined surface 2131C has an angle with respect to the plane formed by the X-axis direction and the Y-axis direction; the sliding cover 212C is a hollow cover structure and has a abutting inclined surface 2121C and a bonding plane 2122C, the abutting inclined surface 2121C is located on one side of the bonding plane 2122C, and the slope of the abutting inclined surface 2121C corresponds to that of the driving inclined surface 2131C so as to be able to be flat against the driving inclined surface 2131C, the bonding plane 2122C is parallel to the plane formed by the X-axis and the Y-axis, and the sliding cover 212C can cover the opening 2112C displaceably along the Z-axis direction and abut against the driving inclined surface 2131C of the driving structure 213C with the abutting inclined surface 2121C. When the driving structure 213C displaces along the Y-axis direction, the driving inclined surface 2131C of the driving structure 213C pushes against the abutting inclined surface 2121C of the sliding cover 212C, causing the sliding cover 212C to displace in the Z-axis direction.

[0127] Refer to Figure 6 and Figure 7 , in some embodiments, a convex block and a groove extending along the Z-axis direction can be further provided between the base 211C and the sliding cover 212C to guide the sliding cover 212C to stably displace along the Z-axis direction; in addition, convex blocks and grooves with the same slopes as the abutting inclined surface 2121C and the driving inclined surface 2131C can also be provided between the abutting inclined surface 2121C of the sliding cover 212C and the driving inclined surface 2131C of the driving structure 213C to improve the smoothness of the relative displacement between the sliding cover 212C and the driving structure 213C.

[0128] Refer to Figure 6 and Figure 7 , in some embodiments, the third linear displacement assembly 21C further includes a driving source 214C, and the driving source 214C is disposed in the base 211C extending along the Y-axis direction to drive the driving structure 213C to displace along the Y-axis direction. In these embodiments, the driving source 214C includes a screw rod, the screw rod extends along the Y-axis direction, and the driving structure 213C is screwed on the outer surface of the screw rod. Thereby, when the screw rod rotates, the driving structure 213C screwed on the outer surface of the screw rod can displace along the Y-axis direction on the outer surface of the screw rod.

[0129] Refer to Figure 6 and Figure 7 , in some embodiments, the driving source 214C further includes a motor, and the motor is drivingly connected to one end of the screw rod to drive the screw rod to rotate and can drive the driving structure 213C to displace. Thereby, the third linear displacement assembly 21C can be controlled to accurately drive the driving structure 213C, providing more convenient and accurate displacement control.

[0130] In the present invention, since the optimal range for measuring the image of the near-eye display device is the state where an appropriate eye distance is maintained between the image display area G4 of the lens module G and the human eye receiving the image or the image analysis module 60. In the field of near-eye display devices, considering the focal length and the product volume, the appropriate eye distance of the near-eye display device is usually not large. Therefore, through the structural configuration of the aforementioned third linear displacement component 21C, the space occupied by the transfer module 20 for providing displacement in the Z-axis direction can be reduced, and the requirements for image analysis of the near-eye display device can still be met.

[0131] Refer to Figure 2 and Figure 6 , in some embodiments, the three rotation components 22 include a first rotation component 22A, a second rotation component 22B, and a third rotation component 22C. The first rotation component 22A is rotatably disposed on the third linear displacement component 21C relative to the third linear displacement component 21C about the Y-axis. The second rotation component 22B is rotatably disposed on the first rotation component 22A relative to the first rotation component 22A about the X-axis. The third rotation component 22C is rotatably disposed on the second rotation component 22B relative to the second rotation component 22B about the Z-axis. Thus, the three rotation components 22 can provide rotational degrees of freedom for rotation about the X-axis, Y-axis, and Z-axis respectively.

[0132] Refer to Figure 2 and Figure 6 , in some embodiments, the first rotation component 22A includes a first lower plate member 221A and a first upper plate member 222A. One surface of the first lower plate member 221A is fixedly disposed on the bonding plane 2122C of the sliding cover 212C of the third linear displacement component 21C. The other surface of the first lower plate member 221A is recessed with a first arc-shaped recess 2211A. The arc of the first arc-shaped recess 2211A is formed around the Y-axis. One surface of the first upper plate member 222A is provided with a first arc-shaped protrusion 2221A corresponding to the shape of the first arc-shaped recess 2211A. The other surface of the first upper plate member 222A is a plane. The first upper plate member 222A is rotatably received in the first arc-shaped recess 2211A of the first lower plate member 221A with the first arc-shaped protrusion 2221A. Thus, the first upper plate member 222A can rotate relative to the linear displacement component 21 about the Y-axis.

[0133] Refer to Figure 2 and Figure 6, in some embodiments, the second rotating assembly 22B includes a second lower plate member 221B and a second upper plate member 222B. One side of the second lower plate member 221B is fixedly disposed on the other side of the first upper plate member 222A of the first rotating assembly 22A. A second arc-shaped concave portion 2211B is recessed on the other side of the second lower plate member 221B. The arc of the second arc-shaped concave portion 2211B is formed around the X-axis. A second arc-shaped convex portion 2221B corresponding to the shape of the second arc-shaped concave portion 2211B is disposed on one side of the second upper plate member 222B, and the other side of the second upper plate member 222B is a flat surface. The second upper plate member 222B is rotatably received in the second arc-shaped concave portion 2211B of the second lower plate member 221B by means of the second arc-shaped convex portion 2221B. Thus, the second upper plate member 222B can rotate relative to the first rotating assembly 22A around the X-axis.

[0134] Refer to Figure 2 and Figure 6 , in some embodiments, the third rotating assembly 22C includes a rotating shaft 221C and a rotating disc 222C. The rotating shaft 221C extends along the Z-axis direction and is disposed on the second upper plate member 222B of the second rotating assembly 22B. The rotating disc 222C is rotatably sleeved on the rotating shaft 221C. Thus, the rotating disc 222C can provide a degree of freedom of rotation around the Z-axis. In these embodiments, the stage 30 is disposed on the rotating disc 222C of the third rotating assembly 22C. Thus, the stage 30 can generate three linear displacement degrees of freedom and three rotational degrees of freedom for the transfer based on the transfer module 20.

[0135] The stage 30 can cooperate with the assembly of the inspection fixture 40 suitable for different types of near-eye display devices. In some embodiments, the inspection fixture 40 can be, but is not limited to, detachably disposed on the stage 30 through screw locking members. It is worth noting that the stage 30 can also change its form according to the relative configuration relationship between the transfer module 20 and the attitude detection module 50 or the image analysis module 60. Specifically, the stage 30 can be a structural form that completely overlaps the transfer module 20 (as shown in Figure 6 , Figure 7 ), or it can be a structural form that extends along the X-axis direction and only partially overlaps the transfer module 20 (as shown in Figure 1 , Figure 5 ).

[0136] Refer to Figure 3 and Figure 5 , the inspection fixture 40 can be detachably disposed on the stage 30 and is used to carry the near-eye display device. In some embodiments, the inspection fixture 40 depends on the type of the near-eye display device. Hereinafter, an example of a near-eye display device applicable to a lens module G and a projection device P will be described, but the present invention is not limited thereto.

[0137] Refer to Figure 3 and cooperate with Figure 8 andFigure 9 , Figure 8 is a perspective view of a detection jig of an embodiment of a detection device for a near-eye display device of the present invention; Figure 9 is a schematic plan view of a detection jig of an embodiment of a detection device for a near-eye display device of the present invention. In some embodiments, the detection jig 40 further includes an assembly part 42 and opposite first and second surfaces 43 and 44. The positioning part 41 is recessed from the first surface 43, and the assembly part 42 is a groove recessed from the second surface 44. In these embodiments, the shape of the assembly part 42 generally corresponds to the outer contour shape of the near-eye display device and is slightly larger than the outer contour of the near-eye display device, so that the near-eye display device can be received in the assembly part 42 from the second surface 44 of the detection jig 40 and abutted against the bottom of the assembly part 42. Herein, the assembly part 42 further has a through port 421 and a side wall 422. The through port 421 penetrates through the assembly part 42. When the near-eye display device is assembled in the assembly part 42, the lens module G corresponds to the through port 421, and the projection device P abuts against the bottom and the side wall 422 of the assembly part 42.

[0138] Refer to Figure 3 and cooperate with Figure 8 and Figure 9 , the positioning part 41 includes a first part 411 and a second part 412 that are connected. The first part 411 penetrates and communicates with the assembly part 42. The second part 412 does not penetrate the detection jig 40 and has a partition surface 413. Herein, at the junction of the first part 411 and the second part 412, that is, the boundary of the partition surface 413 adjacent to the first part 411 is close to the side wall 422 of the assembly part 42. Herein, when the near-eye display device is assembled in the assembly part 42, a part of the projection device P can be observed from the first part 411 of the positioning part 41 on the first surface 43. As long as the projection device P can abut against the side wall 422 when assembled in the assembly part 42, the position of the projection device P can be determined through the fixed relative relationship between the side wall 422 and the positioning part 41. Since the position of the projection device P assembled on the lens module G is also fixed and known, in this way, the position of the lens module G can be further determined according to the position of the projection device P.

[0139] Refer to Figure 1 , the attitude detection module 50 is disposed on the frame 10 to detect the position of the positioning part 41 on the detection jig 40, and further calculate the position of the lens module G according to the position of the positioning part 41 to facilitate the image analysis module 60 to detect the image at the correct position. In some embodiments, the attitude detection module 50 is higher than the stage 30 and the detection jig 40 in the Z-axis direction. Herein, after the detection jig 40 is assembled on the stage 30, in the Z-axis direction, the first surface 43 of the detection jig 40 is closer to the attitude detection module 50 than the second surface 44.

[0140] Refer to Figure 1, in some embodiments, the posture detection module 50 includes a telecentric image measurement unit 51. The telecentric image measurement unit 51 uses a telecentric lens with a parallel optical path design for machine vision measurement. Through the telecentric image measurement unit 51, within a specific object distance range, an image with a fixed magnification can be captured. That is to say, the captured image will not have the visual error of objects appearing larger when closer and smaller when farther away. Thereby, the measurement error can be reduced and the measurement accuracy can be improved. Herein, the detection jig 40 is positioned at the plane formed by the X-axis and the Y-axis, and the optical axis of the telecentric image measurement unit 51 is perpendicular to the detection jig 40 and is located at a position in a different Z-axis direction from the detection jig 40, thereby enabling the position of the positioning portion 41 on the detection jig 40 in the plane formed by the X-axis and the Y-axis to be measured and determined.

[0141] Refer to Figure 1 , the image analysis module 60 is disposed on the frame 10 for analyzing the image displayed on the lens module G. In some embodiments, the transfer module 20 is located on one side of the image analysis module 60 in the X-axis direction, and the stage 30 extends along the X-axis direction as an elongated structure. When the transfer module 20 transfers the stage 30 to overlap with the image analysis module 60 in the Y-axis direction, the stage 30 extends above the image analysis module 60 in the Z-axis direction for detection.

[0142] Refer to Figure 1 , in some embodiments, the controller 70 can be, but is not limited to, a central processing unit (CPU), a microcontroller unit (MCU), a digital signal processor (DSP), a programmable logic controller (PLC), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or other similar devices or a combination of these devices. In other embodiments, the controller 70 can also be implemented in the form of a hardware circuit to perform various operation functions. Examples include, but are not limited to: workstations, laptop computers, client terminals, servers, distributed computing systems, handheld devices, or any other computing systems or devices. In its most basic configuration, the controller 70 may include at least one processor and system memory.

[0143] Herein, the detection device of the near-eye display device controls the transfer module 20, the attitude detection module 50, and the image analysis module 60 through the controller 70 to complete the position confirmation and detection of the near-eye display device.

[0144] Refer to Figures 1 to 10 , Figure 10 which is a flowchart of the steps of an embodiment of the detection method of the near-eye display device of the present invention. The following describes the step flow of some embodiments of the detection method of the near-eye display device of the present invention, including:

[0145] Step S01: Provide the near-eye display device to the stage 30 on the transfer module 20. The near-eye display device is assembled on the detection jig 40, and the detection jig 40 includes a positioning portion 41;

[0146] Step S02: The transfer module 20 transfers the stage 30 to one side of the attitude detection module 50. The attitude detection module 50 detects the position of the positioning portion 41 on the detection jig 40, and obtains the display area center G41 of the display area G4 according to the position of the positioning portion 41;

[0147] Step S03: The transfer module 20 transfers the stage 30 to align the display area center G41 with the image analysis module 60;

[0148] Step S04: The projection device P outputs an image, and the image analysis module 60 analyzes the image.

[0149] Refer to Figure 1 , in some embodiments, in step S01, the near-eye display device can be provided to the stage 30 manually by an operator, but not limited thereto. In other embodiments, a robotic arm or an automatic pick-and-place device can also be provided around the detection device of the overall near-eye display device to complete automated loading / unloading. Herein, the near-eye display device is assembled on the detection jig 40 including the positioning portion 41. In some embodiments, the near-eye display device can be first assembled on the detection jig 40 and then provided to the stage 30, or the detection jig 40 can be assembled on the stage 30, and then the near-eye display device is assembled to the detection jig 40 on the stage 30. The present invention is not limited thereto.

[0150] Refer to Figure 3 and Figure 10, in step S02, the pose detection module 50 calculates the position of the center G41 of the display area capable of displaying the best image based on the invariance of the hardware structure and the design of the near-eye display device. In some other embodiments, in step S02, the position of the center G41 of the display area may also be calculated by the controller 70 capturing the pose detection result of the pose detection module 50, and the present invention is not limited thereto. Specifically, the relative position of the positioning portion 41 and the assembly portion 42 on the detection jig 40 is fixed. When the near-eye display device is assembled to the assembly portion 42, the outer surface P2 of the projection device P of the near-eye display device is restricted by the side wall 422 of the assembly portion 42 and can be positioned to a predetermined position. That is to say, after the near-eye display device is assembled to the assembly portion 42, the projection device P of the near-eye display device can be positioned to a position with a fixed relative relationship with the positioning portion 41.

[0151] In this way, when the projection device P of the near-eye display device is restricted by the side wall 422 of the assembly portion 42 and positioned to a predetermined position, as long as the position of the positioning portion 41 is determined first, the position of the projection device P and the image output portion thereon can be obtained. And since the position of the projection device P assembled on the lens module G is also known and fixed, the position of the lens module G and the display area G4 and the center G41 of the display area thereon can be further obtained based on the center position of the image output portion.

[0152] In some embodiments, in step S03, the pose detection module 50 may first detect the yaw offset of the positioning portion 41 on the detection jig 40 rotating left and right around the Z axis through the telecentric measurement unit 51, and detect the offsets of the center G41 of the display area of the lens module G in the X-axis direction and the Y-axis direction. After the pose detection module 50 detects the pose, the transfer module 20 corrects the yaw pose of the stage 30 rotating left and right around the X axis, the Y axis, and the Z axis according to the detection result of the pose detection module 50. After determining that the poses of the stage 30 in the X-axis direction, the Y-axis direction, and the yaw are correct, the transfer module 20 aligns the center G41 of the display area of the lens module G and the image analysis module 60 based on the corrected pose of the stage 30, thereby ensuring the alignment accuracy between the center G41 of the display area of the lens module G and the image analysis module 60 and improving the image analysis accuracy.

[0153] To enable the image analysis module 60 to accurately simulate the state of a user's eye observing an image, in an optical product, the optimal distance between the human eye and the optical product at which the image can be clearly seen is the eye relief. For a near-eye display device, the near-eye display device has a predetermined eye relief in its optical design. Therefore, in some embodiments, after step S03, the attitude detection module 50 detects the detection distance between the lens module G and the image analysis module 60, and the transfer module 20 adjusts the attitude of the stage 30 so that the detection distance conforms to the eye relief of the near-eye display device. Thereby, the image analysis module 60 can obtain the best image displayed by the lens module G.

[0154] Referring to Figure 1 , in some embodiments, the attitude detection module 50 further includes a confocal distance measurement unit 52. The confocal distance measurement unit 52 uses the principle of confocal microscopy to perform measurements. Confocal microscopy is an optical imaging method that uses point-by-point illumination and spatial pinhole modulation to remove scattered light from non-focal planes of the object to be measured, which can improve optical resolution and visual contrast compared to traditional imaging methods.

[0155] In some embodiments, the specific structural configuration and operation of the confocal distance measurement unit 52 are as follows: The detection light emitted from a point light source is focused on the object to be measured through a lens (in this embodiment, the object to be measured is the lens module G and the image analysis module 60 in the near-eye display device). When the position of the object to be measured is at the focus, the reflected light energy can be converged back to the light source through the original lens to form confocal (abbreviated as confocal), and when the position of the object to be measured is not at the focus, the reflected light will be blocked and cannot return to the light source. Thereby, the distance between the lens module G and the image analysis module 60 in the focusing direction can be measured through the signal intensity of the reflected light. Here, the lens module G is positioned at the plane formed by the X-axis and the Y-axis, the image analysis module 60 is located below the lens module G in the Z-axis direction, and the optical axis of the confocal distance measurement unit 52 is perpendicular to the lens module G and the image analysis module 60 and is located above the lens module G and the image analysis module 60 in the Z-axis direction. Thereby, the distances from the confocal distance measurement unit 52 to the lens module G and the image analysis module 60 in the Z-axis direction can be measured.

[0156] Referring to Figure 4 and FIG. 11 (including Figure 11A and Figure 11B ), Figure 11A is a light wave signal diagram generated by the measurement of the confocal distance measurement unit in an embodiment of the detection device for the near-eye display device of the present invention. Figure 11B For corresponding Figure 11A is a schematic diagram of the measurement position. Here,Figure 11A It is a signal diagram showing the different positions and light intensities measured by the confocal measurement unit 52 in different Z-axis directions. Specifically, when the measurement light emitted by the confocal measurement unit 52 enters different media, its light intensity changes and different wavelengths are correspondingly generated. The confocal measurement unit 52 can then determine the wavelength of each measurement position based on the light intensity and calculate the distance value of each measurement position in the Z-axis direction through the conversion relationship between wavelength and distance.

[0157] Referring to FIG. 11, in some embodiments, the confocal measurement unit 52 measures the first optical wavelength L1 of the outer side surface G2 of the lens module G away from the first surface S1 of the waveguide optical element G3, the second optical wavelength L2 of the outer side surface G2 of the lens module G close to the second surface S2 of the waveguide optical element G3, the third optical wavelength L3 of the third surface S3 of the waveguide optical element G3 away from the outer side surface G2, the fourth optical wavelength L4 of the eye side surface G1 away from the fourth surface S4 of the waveguide optical element G3, and the fifth optical wavelength L5 of the fifth surface S5 of the image analysis module 60 close to the eye side surface G1. Based on this, there is a first optical wavelength relationship L12 between the first optical wavelength L1 and the second optical wavelength L2, a second optical wavelength relationship L23 between the second optical wavelength L2 and the third optical wavelength L3, a third optical wavelength relationship L34 between the third optical wavelength L3 and the fourth optical wavelength L4, and a fourth optical wavelength relationship L45 between the fourth optical wavelength L4 and the fifth optical wavelength L5.

[0158] Herein, the distance in the Z-axis direction between the first surface S1 of the outer side surface G2 of the lens module G away from the waveguide optical element G3 and the third surface S3 of the waveguide optical element G3 away from the outer side surface G2 is the second distance Z2, and the second distance Z2 is a known value (the sum of the thickness of the outer side surface G2 and the thickness of the waveguide optical element G3) set during product design. Thus, the first optical wavelength relationship L12 and the second optical wavelength relationship L23 measured by the confocal measurement unit 52 can correspond to the known thickness value of the second distance Z2. Based on the measured optical wavelength or optical wavelength relationship and the known thickness distance, the conversion relationship between optical wavelength and distance can be obtained, and the confocal measurement unit 52 can then convert the optical wavelength and its distance value of each surface according to the conversion relationship between optical wavelength and distance.

[0159] Referring to Figure 4As shown in FIGS. 10 and 11, in order to measure the detection distance, in some embodiments, the confocal measurement unit 52 converts the fourth optical wavelength L4 measured to the fourth surface S4 into the first distance Z1 between the confocal measurement unit 52 and the fourth surface S4 of the lens module G on the eye side G1 away from the waveguide optical element G3. In these embodiments, the confocal measurement unit 52 then converts the fifth optical wavelength L5 measured to the fifth surface S5 and converts the third distance Z3 in the Z-axis direction between the confocal measurement unit 52 and the fifth surface S5 of the image analysis module 60 close to the eye side G1. After that, the difference between the third distance Z3 and the first distance Z1 is the fourth distance Z4 in the Z-axis direction between the fourth surface S4 of the lens module G on the eye side G1 away from the waveguide optical element G3 and the fifth surface S5 of the image analysis module 60 close to the eye side G1. And the actual detection distance is the distance in the Z-axis direction between the fifth surface S5 of the image analysis module 60 close to the eye side G1 and the third surface S3 of the waveguide optical element G3 away from the outer side G2, which is the sum of the second distance Z2 and the fourth distance Z4. Thereby, the detection distance can be detected and calculated, and the transfer module 20 can adjust the attitude of the stage 30 according to the detection distance so that the detection distance conforms to the suitable eye distance of the near-eye display device for image analysis.

[0160] In some embodiments, the image analysis module 60 analyzes at least one of the modulation transfer function curve (MTF), the field of view (FOV), the distance from the center of the image to the center of the visible range, the vertical and horizontal rotation angles of the image, the brightness uniformity of the image, the distortion rate of the image, the color uniformity of the image, the contrast of the image as a 4×4 checkerboard pattern, the contrast of the image as a 7×7 checkerboard pattern, and the contrast between the pure color and the dark field of the image, thereby ensuring the product quality of the near-eye display device.

[0161] Referring to Figure 1 and Figure 10 , in some embodiments, the detection device of the near-eye display device further includes a scanning module 80, and the scanning module 80 is disposed on the frame 10. In these embodiments, before step S02, that is, before the transfer module 20 transfers the stage 30 to one side of the attitude detection module 50, the controller 70 first controls the transfer module 20 to transfer the stage 30 to the scanning module 80. In these embodiments, the near-eye display device includes identification information. Thereby, the information of the near-eye display device to be tested can be read before the near-eye display device is detected, which is convenient for automated testing or warehouse management and control.

[0162] It should be noted that in the present invention, the configurations of the transfer module 20, the attitude detection module 50, and the image analysis module 60 on the frame 10 are not limited to the above embodiments. Please refer to Figure 12, Figure 12 It is a schematic diagram of another embodiment of the detection device for the near-eye display device of the present invention. In some embodiments, the image analysis module 60, the transfer module 20, and the attitude detection module 50 are horizontally spaced along the X-axis direction, and the detection jig 40 is positioned on the stage 30 in a vertical posture. In the X-axis direction, the transfer module 20 is located between the image analysis module 60 and the attitude detection module 50. The transfer module 20 transfers the stage 30 to linearly displace along the X-axis direction to drive the near-eye display device close to the attitude detection module 50 to detect the correct detection position. After the attitude detection module 50 completes the detection of the detection position, the transfer module 20 transfers the stage 30 to linearly displace along the X-axis direction to be close to the image analysis module 60 for image quality analysis. Thereby, detection devices with different spatial configurations can be provided to meet different requirements.

Claims

1. A detection device for a near-eye display device, characterized in that, Suitable for detecting a near-eye display device including a lens module and a projection device, the lens module includes an image display area, the projection device is disposed in the lens module, and the detection device includes: A frame; A transfer module, which is disposed on the frame and can be displaced relative to the frame; A stage, which is disposed on the transfer module; A detection jig, which is disposed on the stage for carrying the near-eye display device, and the detection jig includes a positioning portion; An attitude detection module, which is disposed on the frame; An image analysis module, which is disposed on the frame; and A controller, which is electrically connected to the transfer module, the attitude detection module, and the image analysis module; Wherein, the controller controls the transfer module to transfer the stage to one side of the attitude detection module; the controller controls the attitude detection module to detect the position of the positioning portion and calculates a center of the image display area according to the position of the positioning portion; the controller controls the transfer module to transfer the stage so that the center of the image display area is aligned with the image analysis module; the controller controls the projection device to output an image and display it on the image display area, and controls the image analysis module to analyze the image.

2. The detection device for a near-eye display device according to claim 1, wherein The near-eye display device has an eye relief; the controller controls the attitude detection module to detect a detection distance between the lens module and the image analysis module, and controls the transfer module to adjust the attitude of the stage so that the detection distance conforms to the eye relief.

3. The detection device for a near-eye display device according to claim 2, characterized in that, The attitude detection module includes a telecentric measurement unit and a confocal measurement unit; the lens module is located between the confocal measurement unit and the image analysis module; the lens module includes a waveguide optical element; the controller controls the telecentric measurement unit to detect the position of the positioning portion; the controller controls the confocal measurement unit to detect the distance between the waveguide optical element of the lens module and the image analysis module as the detection distance.

4. The detection device for the near-eye display device according to claim 1, characterized in that, The transfer module includes three linear displacement components and three rotation components. The three linear displacement components are overlapped and disposed on the frame along a Z-axis direction, and the three rotation components are overlapped and disposed on the three linear displacement components along the Z-axis direction.

5. The detection device for a near-eye display device according to claim 4, wherein, The three linear displacement components include a first linear displacement component, a second linear displacement component, and a third linear displacement component. The first linear displacement component extends along a Y-axis direction, the second linear displacement component extends along an X-axis direction and can be displaced along the Y-axis direction with the first linear displacement component, the third linear displacement component can be displaced along the X-axis direction with the second linear displacement component and can be displaced relative to the second linear displacement component along the Z-axis direction, and the three rotation components are disposed on the third linear displacement component.

6. The detection device for a near-eye display device according to claim 5, characterized in that, The three rotation components include a first rotation component, a second rotation component, and a third rotation component. The first rotation component is disposed on the third linear displacement component and can rotate relative to the third linear displacement component about the Y-axis, the second rotation component is disposed on the first rotation component and can rotate relative to the first rotation component about the X-axis, and the third rotation component is disposed on the second rotation component and can rotate relative to the second rotation component about the Z-axis.

7. A detection method for a near-eye display device, characterized in that, Suitable for detecting a near-eye display device including a lens module and a projection device, the lens module includes an image display area, and the projection device is disposed on the lens module. The detection method includes: Providing the near-eye display device to a stage on a transfer module, the near-eye display device is assembled on a detection jig, and the detection jig includes a positioning portion; The transfer module transfers the stage to one side of an attitude detection module; the attitude detection module detects the position of the positioning portion on the detection jig and calculates a center position of the image display area based on the position of the positioning portion; The transfer module transfers the stage to align the center of the image display area with an image analysis module; and The projection device outputs an image, and the image analysis module analyzes the image.

8. The detection method of the near-eye display device according to claim 7, characterized in that, After the center of the image display area is aligned with the image analysis module, the attitude detection module detects a detection distance between the lens module and the image analysis module, and the transfer module adjusts the attitude of the stage so that the detection distance conforms to an appropriate eye distance of the near-eye display device.

9. The detection method of the near-eye display device according to claim 8, wherein The attitude detection module includes a telecentric measurement unit and a conjugate focus measurement unit; the telecentric measurement unit measures the position of the positioning portion in an X-axis direction and in a Y-axis direction, and a controller calculates the center position of an image output portion of the projection device based on the position of the positioning portion in the X-axis direction and the Y-axis direction, and then calculates the position of the center of the image display area based on the center position of the image output portion; the lens module includes a waveguide optical element; the conjugate focus measurement unit detects the distance between the waveguide optical element of the lens module and the image analysis module in a Z-axis direction as the detection distance.

10. The detection method of the near-eye display device according to claim 7, characterized in that, The image analysis module analyzes at least one of a modulation transfer function curve (Modulation Transfer Function, MTF), a field of view (Field of View, FOV), the distance from the center of the image to the center of the field of view, the vertical and horizontal rotation angles of the image, the brightness uniformity of the image, the distortion rate of the image, the color uniformity of the image, the contrast of the image as a 4×4 checkerboard pattern, the contrast of the image as a 7×7 checkerboard pattern, and the contrast between the pure color and the dark field of the image.

Images