TW202212915A - Image display systems for eyebox expansion and methods of making the same - Google Patents

Abstract

Disclosed are systems and methods for expanding eyebox for a viewer, including (but not limited to) for the near eye display applying retinal projecting technologies from a head wearable device such as smart glasses. This disclosure includes two embodiments. The first embodiment applying a principle of “light-split” comprises an optical duplicator to generate multiple instances of an incident light signal to achieve eyebox expansion for a viewer. The second embodiment applying a principle of “time-split” comprises an optical reflector moving to redirect multiple light signals at a different angle of incidence to achieve eyebox expansion for a viewer.

Description

Image display system and method for expanding visible space

The present invention generally relates to an image display system and a manufacturing method for enlarging the eye movement range. In particular, the system and method apply the principle of "splitting" or "time division" to enlarge the eye movement range of an observer.

One of the main challenges in the design of AR/VR headsets is reducing the physical size of the device while maintaining sufficient image quality, viewing angle, and viewing position. The range of visual positions in which the image provided by the device is visible to the viewer is called the "eye movement range". The size and position of the eye movement range greatly affects the user experience. For example, if the eye movement range is too small, the viewer may not be able to see the image generated from the AR/VR headset when the viewer's line of sight is slightly off the direction of the incoming image. The enlargement of the eye movement range (in other words, increasing the number and range of visual positions of the image provided by a head-mounted AR/VR device) can be achieved through optical methods. However, expanding the eye movement range tends to add bulky optics to the AR/VR headset. Therefore, there is a need to devise a system and method to expand the eye movement range without sacrificing the user experience and affecting the physical size of the head-mounted AR/VR device.

An object of the present invention is to provide an image display system and method to expand the eye movement range for a viewer, the system and method including (but not limited to) applying retinal projection technology from a head-mounted device (such as smart glasses) to a near-eye display. The present invention contains two embodiments.

An image display system in the first embodiment includes a first image projector, a first optical replicator and a first light combining element. The first image projector generates a plurality of optical signals of a first image. The first optical replicator accepts an optical signal generated by the first image projector, replicates the optical signal into N non-parallel beams and redirects each of the N beams of the optical signal to a The first light combining element, wherein N is an integer greater than one. The first light combining element is located between the first optical replicator and one eye of the observer, and the light combining element is used for receiving N light beams of the optical signal and converging them to the eye of the observer respectively. N viewpoints in the eye movement range. The image viewer system may further include a second image projector, a second optical replicator, and a second light combining element to expand the eye movement range of the observer's other eye in the same manner. Therefore, the image display system can simultaneously expand the eye movement range of the observer's left eye and right eye.

The second embodiment applies the "time division" principle, and includes an optical reflector that moves at different angles of incidence to redirect a number of optical signals to expand the eye movement range of a viewer. An image display system of the second embodiment includes a first image projector, a first optical reflector and a first light combining element. The first image projector generates a plurality of optical signals of a first image. The first optical reflector receives a plurality of optical signals generated by the first image projector and moves to redirect the plurality of optical signals to a first light combining element, the movement of the first optical reflector causes the The incident angles of several optical signals arriving at the first light combining element are different. The first light combining element is located between the first optical reflector and one eye of the viewer, and is used for receiving and converging the plurality of optical signals to a first viewing area of the viewer's eye to enlarge the viewer's eye range of eye movements. In addition, the moving frequency of the first optical reflector is adjusted according to the projection frequency of the first image projector, so that the plurality of optical signals of the first image are projected to the viewer's visible light during the visual persistence time. Area. The image display system may further include a second image projector, a second optical reflector, and a second light combining element to expand the eye movement range of the observer's other eye in the same manner. Therefore, the image display system can simultaneously expand the eye movement range of the observer's left eye and right eye.

In the first embodiment and the second embodiment, the image display system of the viewer's eyes is used to display an object with depth. The light signal redirected from the second light combining element is a first redirected right light signal, and the opposite light signal redirected from the first light combining element is a first redirected left light signal. The first redirected right light signal and the first redirected left light signal are perceived by the viewer to display a first virtual binocular pixel of an object, the depth of which is the same as the first redirected right light signal and the relative The first redirection is related to a first angle between the left light signals. Generally speaking, the first depth is determined by the horizontal distance between the first redirected right light signal and the opposite first redirected left light signal.

In AR and MR applications, an image display system can further include a support structure that can be worn on the observer's head. The first image projector, the second image projector, the first optical replicator and the second optical replicator of the first embodiment (the first optical reflector and the second optical replicator of the second embodiment) Optical reflector), the first light combining element and the second light combining element are all carried by the support structure. In one embodiment, the system is a head-worn device, particularly a pair of glasses, such as smart glasses. In this case, the support structure may be a pair of frames, possibly with lenses, which may be prescription lenses for the correction of nearsightedness or farsightedness or the like.

Other features and advantages of the invention will be described hereinafter, some of which may be learned from the description or examples of the invention. The objectives and other advantages of the invention will be realized by the structure and method particularly pointed out in the written description, claims, and drawings. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the claimed invention.

Terms used herein are used to describe details in specific embodiments of the present invention, and all terms should be interpreted in the broadest sense reasonably. Certain terms will be highlighted below; any limiting terms will be defined by specific examples.

The present invention relates to one or more methods, systems and apparatuses for extending the eye movement range of an image display including, but not limited to, applications using retinal projection technology from head-mounted devices such as smart glasses. near-eye display. The present invention contains two embodiments. What is described with respect to the first embodiment may be used for the second embodiment and vice versa. The first embodiment uses the principle of "splitting" to expand the eye movement range of the viewer. This embodiment includes an optical replicator to generate several beams of an incident light signal. An image display device of the first embodiment includes a first image projector, a first optical replicator and a first light combining element. The first image projector generates a plurality of optical signals of a first image. The first optical replicator accepts an optical signal generated by the first image projector, replicates the optical signal into N non-parallel beams and redirects each of the N beams of the optical signal to a The first light combining element, wherein N is an integer greater than one. The first light combining element is located between the first optical replicator and one eye of the observer, and the light combining element is used for receiving N light beams of the optical signal and converging them to the eye of the observer respectively. N viewpoints in the eye movement range. The image viewer system may further include a second image projector, a second optical replicator, and a second light combining element to expand the eye movement range of the observer's other eye in the same manner. Therefore, the image display system can simultaneously expand the eye movement range of the observer's left eye and right eye.

The second embodiment applies the "time division" principle, and includes an optical reflector that moves at different angles of incidence to redirect a number of optical signals to expand the eye movement range of a viewer. An image display system of the second embodiment includes a first image projector, a first optical reflector and a first light combining element. The first image projector generates a plurality of optical signals of a first image. The first optical reflector receives a plurality of optical signals generated by the first image projector and moves to redirect the plurality of optical signals to a first light combining element, the movement of the first optical reflector causes the The incident angles of several optical signals arriving at the first light combining element are different. The first light combining element is located between the first optical reflector and one eye of the viewer, and is used for receiving and converging the plurality of optical signals to a first viewing area of the viewer's eye to enlarge the viewer's eye range of eye movements. In addition, the moving frequency of the first optical reflector is adjusted according to the projection frequency of the first image projector, so that the plurality of optical signals of the first image are projected to the viewer's visible light during the visual persistence time. Area. The image display system may further include a second image projector, a second optical reflector, and a second light combining element to expand the eye movement range of the observer's other eye in the same manner. Therefore, the image display system can simultaneously expand the eye movement range of the observer's left eye and right eye.

In the first embodiment and the second embodiment, the image display system of the viewer's eyes is used to display an object with depth. The light signal redirected from the second light combining element is a first redirected right light signal, and the opposite light signal redirected from the first light combining element is a first redirected left light signal. The first redirected right light signal and the first redirected left light signal are perceived by the viewer to display a first virtual binocular pixel of an object, the depth of which is the same as the first redirected right light signal and the relative The first redirection is related to a first angle between the left light signals. Generally speaking, the first depth is determined by the horizontal distance between the first redirected right light signal and the opposite first redirected left light signal.

first embodiment As shown in FIG. 1A , in the first embodiment, an image display system 100 includes a first image projector 110 , a first optical replicator 120 and a first light combining element 130 . By the principle of "splitting", the first embodiment uses the first optical replicator 120 to receive an optical signal of a first image, and generates a plurality of light beams of the light signal, and these light beams are respectively converged to a plurality of viewpoints (ie, 151, 152, 153). ) to expand the eye movement range of a viewer's eyes. Traditionally, the eye movement range contains only one viewpoint. With the present invention, the eye movement range can be expanded to include several viewpoints. A viewpoint can be separated, abutted, or overlapped with an adjacent viewpoint. The eye movement range is an area where the observer's eye 140 can see the complete image. In other words, as long as the viewer's eyes move within the eye movement range, the viewer can see the complete image. The image display system 100 can expand the eye movement range of a viewer's eyes.

The image display system 100 can be carried by a head wearable device (HWD), which in one embodiment can be a pair of smart glasses 180 as shown in FIG. 1B . The pair of spectacles has a frame 185 and a pair of spectacle lenses 190 . The frame 185 has a first image projector 110 and the first image replicator 120 . The positions of the first image projector 110 and the first image replicator 120 are adjusted according to the design of the light path. The spectacle lens 190 is provided with the first light combining element 130 . In one embodiment, the first light combining element 130 and the spectacle lens 190 are combined into a single component. In this case, the image display system 110 can expand the eye movement range for the wearer of the head-mounted device. A viewer can see the complete image from different viewpoints (ie 151, 152, 153) within the eye movement range. Furthermore, since the smart glasses 180 can be customized for the viewer, the interpupillary distance can be adjusted according to each viewer. Those skilled in the art can know that in other embodiments, the image display system 100 can be used to expand the eye movement range for several viewers at the same time.

The light source of the first image projector 100 can be a laser, light emitting diode (LED), including mini or micro LED, organic light emitting diode (OLED), superluminescent light emitting diode (LED) (SLD), liquid crystal on silicon (LCoS), or liquid crystal display (LCD), or a combination of the above. In one embodiment, the first image projector 110 is a laser scanning projector (LBS projector), the projector is composed of a light source (including a red laser, a green laser and a blue laser), a Light color modifiers (such as dichroic light combiners and polarized light combiners) and a two-dimensional tunable reflector (such as MEMS mirrors). The LBS projector has a preset resolution (eg, 1280x720 pixels per frame) to sequentially generate and scan light signals one by one. Next, the optical signal of one pixel is generated and projected to the first optical replicator 120 at a time. In order for one eye of the viewer to see the 2D image, the LBS projector must sequentially generate light signals (eg 1280x720 light signals for each pixel of the first image) within the visual persistence time (eg 1/18 second) light signal). Therefore, the duration of each optical signal is approximately 60.28 nanoseconds.

In another embodiment, the first image projector 110 can be a digital light processing (DLP) projector that can generate a two-dimensional color image at a time. Texas Instruments' DLP technology is one such technology that can be used in the manufacture of DLP projectors. Each frame of a complete two-dimensional color image, for example, may include 1280×720 pixels, and is projected to the first optical replicator 120 at the same time. Therefore, after receiving N non-parallel beams of an incident optical signal, the first optical replicator 120 can simultaneously redirect N non-parallel beams of several optical signals (eg, 1280×720 optical signals) in one frame to In the first light combining element 130, N is an integer greater than 1.

When using an LBS projector as the first image projector 110, the first optical replicator 120 is used to simultaneously receive several optical signals generated by the first image projector, and the replica is located and faces in the first image projector. between an image projector 110 and the light path of the first light combining element 130 . For each received optical signal, the first optical replicator 120 replicates the optical signal into N non-parallel light beams, and redirects the N light beams of the optical signal to the first light combining element 130 respectively . The first light combining element 130 is located and faces between the first optical replica 120 and the observer's eye 140 for redirecting each of the N non-parallel light beams of the optical signal to the observer's eye respectively N viewpoints within the moving range (such as 151, 152, 153...). Again, a viewpoint can be separate, abutted, or overlap an adjacent viewpoint. Those with ordinary knowledge in the art should know how to determine the number of viewpoints, the range of viewpoints and the adjacent two viewpoints according to the pupil size, the image resolution, the scan rate of the first image projector 110 and the interference effect between different beams of the optical signal. distance between viewpoints. The average adult pupil size is 2-4 cm in diameter in bright places and 4-8 cm in diameter in dark places. In one embodiment, the distance between two centrally adjacent viewpoints is about 2.6-3 cm.

The N non-parallel light beams of the optical signal from the first optical replicator 120 may converge on a point of the first light combining element 130 . In another embodiment, N non-parallel light beams of the optical signal from the first optical replicator 120 are reflected at different points on the first light combining element 130, and N non-parallel light beams of the reflected optical signal are reflected The extension of the path converges on the virtual converging plane 135, which is at a distance d behind the first light combining element 130, and is farther from the viewer's eyes. In the above two embodiments, after the first light combining element 130 is reflected, the N non-parallel light beams (eg, the first light beam, the second light beam, the third light beam) of the optical signal of the same image pixel are redirected to the eye movement Relative viewpoints within range 150 (eg, first viewpoint, second viewpoint, third viewpoint). From the viewer's point of view, because N non-parallel light beams of the same image pixel light signal will physically converge on one point of the first light combining element 130, or the extension of these light paths will converge on a virtual convergence plane 135, so when the viewer's eyes see an image pixel from the first viewpoint, the second viewpoint, or the third viewpoint, the image pixel is considered to be at the same location. In other words, the first light beam, the second light beam and the third light beam of the optical signal seen by the viewer's eyes all represent the same image pixel, because they all come from the first light combining element 130 or the converging plane 135 the same point. Therefore, the 2D image from the image display system 100 will be in the same position, no matter from which viewpoint the viewer's eyes see the 2D image. In addition, after being reflected on the first light combining element 130, the relative light beams (eg, the first light beam, the second light beam and the third light beam) of the optical signals of different image pixels reflected from the first light combining element 130 will converge To relative viewpoints (eg, the first viewpoint, the second viewpoint, and the third viewpoint) within the eye movement range 150 .

As shown in FIG. 2, the image display system 100 may further include a first collimator 160, the collimator is located on the first image projector 110 and the first optical replicator 120 to make the movement of the optical signal Orientation is more consistent (parallel) in a particular direction. In other words, the light signals from different pixels of the first image projector 110 become substantially parallel after passing through the first collimator 160 . Therefore, the first collimator 160 makes the incident angle of each optical signal to the first optical replicator 120 approximately the same. The first collimator 160 can be a curved lens or a convex lens.

The first optical replicator 120 is used for replicating an incident light signal into N non-parallel light beams. In other words, after receiving an optical signal, the first optical replicator 120 generates N light beams of the optical signal and redirects them to the first light combining element 130, where N is an integer greater than 1 (eg, N equal to 3,4,5). Due to the result of "splitting", the light intensity of the N non-parallel light beams of the incident light signal will be weakened. The first optical replicator 120 may be a beam splitter, a polarizer, a half-coated mirror, a partial reflector, a dichroic mirror, a dichroic optical coating, and a dielectric optical coating. The first optical replicator 120 may include at least two optical elements to replicate the incident light into at least two beams. Each of the optical elements can be a lens, reflector, partial reflector, mirror, mirror, or a combination thereof.

The first optical replicator 120 can adjust its position, including the direction and distance, so that N non-parallel light beams of an optical signal can be converged. In FIGS. 2 and 3 , the first light beam ( S11 ), the second light beam ( S12 ) and the third light beam ( S13 ) of the first optical signal ( L1 ) converge on the first light combining element 130 A little on C1. Likewise, the first light beam ( S31 ), the second light beam ( S32 ) and the third light beam ( S33 ) of the third optical signal ( L3 ) converge on a point C3 of the first light combining element 130 . When the first optical signal and the third optical signal are the leftmost and rightmost image pixels in the image, respectively, the distance between the point C1 and the point C3 is called a field of view (FOV). In this embodiment, the field of view seen by the viewer from a viewpoint may almost cover the entire area of the first light combining element 130 . Alternatively, the visual field seen by the viewer from a viewpoint may cover more than 80% of the area of the first light combining element. In the conventional case to generate a parallel beam of an optical signal, the area of a light combining element is divided by a plurality of viewpoints, so the viewer's field of view from one viewpoint is much smaller than the field of view of the present invention.

As shown in another embodiment of the image processor 100 shown in FIG. 4 , the first light beam ( S11 ), the second light beam ( S12 ) and the third light beam ( S13 ) of the first optical signal are respectively A light-combining element 130 reflects on points C11, C12, and C13. However, the optical paths of the first reflected beam (RS11), the second reflected beam (RS12), and the third reflected beam (RS13) of the first optical signal (L1) converge to a point D1 on the virtual convergence plane 135. , the converging plane is at the rear d of the first light combining element 130 and further away from the viewer's eyes. In this embodiment, since all beam path extensions of the optical signal of each image pixel converge at a point on the virtual convergence plane 135, no matter from which viewpoint the viewer's eyes see the image, the viewer's eyes perceive Each image pixel (and the entire image) is considered to be at the same location on the virtual convergence plane 135 . This embodiment may be applied in Augmented Reality Assisted Surgery (ARAS), where images generated by the image display system 100, such as those originally acquired from a computed tomography scan, may be superimposed on opposing portions of a patient within a clinic. In some cases, the distance D behind the first light combining element 130 is about 30-40 cm.

The first light combining element 130 reflects several light beams of the optical signal from the first optical replica 120, and converges the relative light beams of each optical signal to a corresponding viewpoint within the eye movement range of a viewer. In one embodiment, the first light combining element 130 is sufficiently transparent to allow ambient light to penetrate to the viewer's eyes. As shown in FIG. 2, FIG. 3, and FIG. 4, from the first optical replicator 120, each first light beam (solid line S11, S21, S31) of the three incident light signals (L1, L2, L3) will be The first light combining element 130 reflects and converges on the first viewpoint P1; from the first optical replicator 120, each second light beam (dotted line S12, S22) of the three incident light signals (L1, L2, L3) , S32) will be reflected by the first light combining element 130 and converge on the second viewpoint P2; from the first optical replicator 120, each third light beam ( The dotted lines S13, S23, S33) are reflected by the first light combining element 130 and converge on the third viewpoint P3. The first light beam, the second light beam and the third light beam of each optical signal from the first replicator 120 will converge on the first light combining element 130, and after reflection, the first light beam will come from the first light element Each first reflected light of the three optical signals ( L1 , L2 , L3 ) of 130 will converge on the first viewpoint P1 . The same is true for the second beam and the third beam of each optical signal.

The first light combining element 130 can be made of a glass or plastic material as a lens, and is coated with a specific material such as metal to make it partially transparent and partially reflective. The first light combining element 130 can be a holographic beam splitter but is not the best choice because the diffraction effect will cause several shadows and RGB shifts. In some embodiments, the use of holographic beamsplitters is avoided.

As described above, the image display system 100 with the first image projector 110 , the first optical replicator 120 and the first light combining element 130 can expand the eye movement range for the viewer. In one embodiment, the image display system 100 may further include a second image projector 115, a second optical replicator 125 and a second light combining element 135, which are connected with the first image projector 110, the first The optical replicator 120 and the first light combining element 130 function in the same way to expand the eye movement range for another point of the viewer. Likewise, the second image projector generates light signals of a second image. The second optical replicator accepts an optical signal generated by the second image projector, replicates the optical signal into M non-parallel beams and redirects each of the M beams of the optical signal to a second Light combining element, wherein M is an integer greater than one. The second light combining element is located between the first optical replicator and one eye of the observer, and the light combining element is used for receiving M light beams of the optical signal and converging them to the other eye of the observer respectively. M viewpoints in the eye movement range. In addition, the second image projector has a similar structure to the first image projector; the second optical replicator has a similar structure to the second optical replicator; the second light combining element and the first light combining element Components have a similar structure. Therefore, the image display system 100 can simultaneously expand the eye movement range of the left and right eyes of the viewer.

The image projector system 100 can include a support structure that can be worn on a viewer's head to carry the first image projector 110, the second image projector 115, the first optical replicator 120, the second optical The replicator 125 , the first light combining element 130 and the second light combining element 135 . The first light combining element 130 and the second light combining element 135 are located in the viewer's field of view. Therefore, in this embodiment, the image display system 100 is a head mounted device (HWD). Especially as shown in FIG. 1B , the image display system is carried by a pair of glasses, which are called smart glasses. In this case, the support structure may be a pair of frames, possibly with lenses, which may be prescription lenses for the correction of nearsightedness or farsightedness or the like. The first image projector 110 and the first optical replicator 120 are carried by the right temple, and the second image projector and the second optical replica are carried by the left temple. The first light combining element can be carried by the right lens and the second light combining element can be carried by the left lens. The bearing can be realized in various ways, and the light combining element is movably or fixedly connected or integrated on the lens. The light combining element can be combined with lenses, including prescription lenses. When the support structure does not contain a lens, the right light combining element and the left light combining element can be directly carried by the frame or the edge.

All elements and variations in the embodiments of the image display system 100 can be applied to head mounted devices. Therefore, the head-mounted device including smart glasses can further carry other components of the image display system, such as a control unit, a first collimator 160 and a second collimator 165 . The first collimator 160 is located between the first image projector and the first optical replicator, and the second collimator 165 is located between the second image projector and the optical replicator. When the image display system 100 is applied to smart glasses, the lenses of the smart glasses can have both the refractive properties of correcting the viewer's vision and the function of a light combining element. The smart glasses can be prescription lenses to meet the vision correction needs of people with nearsightedness or farsightedness. In this case, each lens of the smart glasses may include a diopter unit and a light combining element. The refractive unit and the light-combining element can be manufactured together with the same or different types of materials, and the refractive unit and the light-combining element can be manufactured separately and then assembled together. The two elements can be temporarily connected to each other (eg using built-in magnetic material) or permanently connected together. In both cases, the light-combining element is placed on the side of the lens close to the viewer's eye. If the lens is integral, the light combining element will form the inner surface of the lens. If the lens has two parts, the light combining element is the inner part of the lens. The synthesis element both allows ambient light to pass through and reflects the light signal generated by the image projector to the viewer's eyes to form a virtual image in the real environment. The light combining element has the appropriate curvature to reflect and concentrate all light signals from the optical replicator into the pupil and finally onto the retina.

In one embodiment shown in FIG. 5A , the image display system 100 of the viewer's eyes is used to display an object with depth. Because the depth of the object is the same as where the viewer's eyes are looking, vergence accommodation conflicts (VAC) and focus competition can be avoided. The optical signal redirected from the second light combining element 135 is a first redirected right optical signal (eg RRL21), and the relative optical signal redirected from the first light combining element 130 is a first redirected left optical signal Optical signal (eg: RLL21). The first redirected right light signal (eg, RRL21) and the first redirected left light signal (eg, RLL21) are perceived by the viewer to display a first virtual representation of the object 70 having a first depth (d1). binocular pixel 72, a first angle between the depth and the optical path extension of the first redirected right light signal (eg: RRL21) and the optical path extension of the first redirected left light signal (eg: RLL21) (ϴ1) related. Generally, the first depth is determined by the relative horizontal distance between the first redirected right light signal and the first redirected left light signal.

The image display system 100 shown in FIG. 5A has a first image projector 110, a first optical replicator 120, a first light combining element 130, a second image projector 115, a second optical replicator 125, A second light combining element 135 . The first image projector 110 generates a left light signal (LL2) to the first optical replicator 120, then copies the left light signal into three light beams (LL21, LL22, LL23) and redirects them to the first A light combining element 130 . The first light combining element 130 reflects the three light beams of the left light signal at points C21(L), C22(L) and C23(L), respectively. The three redirected light beams (RLL21, RLL22, RLL23) of the left light signal are projected on the three left viewpoints P1(L), P2(L) and P3(L), respectively, and then onto the viewer's retina. The optical path extensions of the three redirected beams of the left light signal converge at a point D2(L) on the left imaginary converging plane, which is at d1 behind the first light combining element 130 and further away from the viewer's eye .

Likewise, the second image projector 115 generates a right light signal (RL2) to the second optical replicator 125, and then replicates the left signal into three beams (RL21, RL22, RL23) and redirects them to the second light combining element 135 . The second light combining element 135 reflects the three light beams of the right signal at points C21(R), C22(R) and C23(R), respectively. The three redirected light beams (RRL21, RRL22, RRL23) of the right light signal are projected on the three right viewpoints P1(R), P2(R) and P3(R), respectively, and then onto the viewer's retina. The optical path extensions of the three redirected beams of the right light signal converge at a point D2(R) on the right imaginary converging plane, which is at d1 behind the second light combining element 135 and further away from the viewer's eye . The image display system 100 can make the position D2(L) the same as the position D2®, which is the stereoscopic position where the virtual binocular pixel 72 of the object is perceived by the viewer.

In this embodiment, as the eye movement range expands, the viewer's eyes can receive light signals from three pairs of viewpoints: the first right viewpoint P1(R) and the opposite first left viewpoint P1(L), the The second right viewpoint P2(R) and the opposite second left viewpoint P2(L), the third right viewpoint P3(R) and the opposite third left viewpoint P3(L). The viewer's right eye 50 includes a right pupil 52 and a right retina 54 ; the viewer's left eye 60 includes a left pupil 62 and a left retina 64 . Therefore, from the first pair of viewpoints (ie the first right viewpoint P1(R) and the opposite first left viewpoint P1(L)), the viewer's eye can receive the redirected right light signal RRL21 through the pupil and the opposite first beam of the redirected left light signal RLL21 and onto the retina. As a result, the viewer perceives a first virtual binocular pixel 72 of an object that exhibits a first depth (d1), which is the same as the first beam of the redirected right light signal RRL21 and the opposite of the A first angle (ϴ 1) between the optical path extensions of the first beam of the redirected left light signal RLL21 is related. Similarly, from the second pair of viewpoints (ie the second right viewpoint P2(R) and the opposite first left viewpoint P2(L)), the viewer's eye can receive the redirected right light signal through the pupil The second beam of RRL22 and the opposite second beam of the redirected left light signal RLL22 merge onto the retina. As a result, the viewer perceives the same first virtual binocular pixel 72 of the object, and the pixel exhibits a first depth (d1) that is the same as the second beam of the redirected right light signal RRL22 and the relative A first angle (ϴ 1) between the optical path extensions of the second beam of the redirected left light signal RLL22 is related. The above statement can also be applied to the third pair of viewpoints. The distance between each pair of viewpoints is approximately the same because a viewer's interpupillary distance (IPD) does not change as he moves.

In one embodiment, as shown in FIG. 5B, an object, such as the dinosaur 70, is perceived at several depths. In addition to the first virtual binocular pixel 72 of the object, when a second redirected right light signal 18' and an opposite second redirected left light signal 38' are perceived by the viewer and display a second redirected light signal of the object Virtual binocular pixel 74, the pixel exhibits a second depth d2 that is a distance between the optical path extension of the second redirected right light signal 18' and the opposite second redirected left light signal 38' The second angle (ϴ 2) is relevant. In FIG. 5B , for simplicity of illustration, only the first light beams of each of the left and right optical signals from the first optical replicator 120 and the second optical replicator 125 are shown. FIG. 5A has illustrated that the first optical replicator and the second optical replicator generate three beams of the left optical signal and the right optical signal, respectively.

該右瞳孔52與該左瞳孔62之間的距離為瞳距(IPD)。同樣的，在該第二重定向右光信號18’及相對的該第二重定向左光信號38’的光徑延伸之間的該第二角度為ϴ 2。該第二深度d2跟該第二角度ϴ 2有關。特別是，該物體的該第二虛擬雙眼像素74的該第二深度d2可以透過同一公式藉由該第二重定向右光信號及相對的該第二重定向左光信號的光徑延伸之間的該第二角度ϴ 2大致確定。因為該第二虛擬雙眼像素74比起該第一虛擬雙眼像素72在距離該觀看者更遠處(即有更大的深度)被感知，所以該第二角度ϴ 2比該第一角度ϴ 1小。 In FIG. 5B, the image of the dinosaur object 70 includes a first virtual binocular pixel 72 displayed at a first depth d1 and a second binocular pixel 74 displayed at a second depth d2. The first angle between the first redirected right optical signal 16' and the opposite first redirected left optical signal 36' is ϴ1. The first depth d1 is related to the first angle ϴ1. In particular, the first depth of the first virtual binocular pixel of the object can be determined by the first distance between the optical path extensions of the first redirected right light signal and the opposite first redirected left light signal The angle ϴ 1 is determined. The first depth d1 of the first virtual binocular pixel 72 can be roughly calculated by the following formula:

The distance between the right pupil 52 and the left pupil 62 is the interpupillary distance (IPD). Likewise, the second angle between the optical path extension of the second redirected right optical signal 18' and the opposite second redirected left optical signal 38' is ϴ2. The second depth d2 is related to the second angle ϴ2. In particular, the second depth d2 of the second virtual binocular pixel 74 of the object can be calculated by the same formula as the optical path extension of the second redirected right light signal and the opposite of the second redirected left light signal The second angle ϴ 2 between is approximately determined. Because the second virtual binocular pixel 74 is perceived at a greater distance from the viewer (ie, has a greater depth) than the first virtual binocular pixel 72, the second angle ϴ2 is greater than the first angle ϴ2 ϴ 1 min.

In addition, the first redirected right light signal 16' and the opposite first redirected left light signal 36' together display a first virtual binocular pixel 72 of the first depth d1. In one embodiment, the first redirected right light signal 16' is not the parallax of the corresponding first redirected left light signal 36'. Because the right eye and the left eye see the same object at different angles, the disparity between the image received by the right eye and the image received by the left eye is used for a viewer to perceive a stereoscopic image with depth. Therefore, the first redirected right light signal 16' and the opposite first redirected left light signal 36' have the same viewing angle. However, in another embodiment, the right light signal and the opposite left light signal of the virtual binocular pixels may display images with different viewing angles (with parallax). Furthermore, one or both of the right light signal and the left light signal may be modified to present certain stereoscopic effects, such as shadows.

As described above, the right light signals are generated by the second image projector, copied by the second optical replicator, redirected by the second light combining element, and scanned by the right retina to form a right retina image. Similarly, the plurality of left light signals are generated by the first image projector, copied by the first optical replicator, redirected by the first light combining element, and scanned by the left retina to form a left retinal image . In one embodiment shown in FIG. 5B, a right retinal image 80 includes 36 right pixels (6x6 matrix) and a left retinal image 90 also includes 36 left pixels (6x6 matrix). In another embodiment, a right retinal image 80 includes 921600 right pixels (1280x720 matrix) and a left retinal image also includes 921600 left pixels (1280x720 matrix). The image display system 100 can be used to generate right light signals and opposite left light signals, and the light signals form the right retina image and the left retina image on the right retina and the left retina, respectively. Therefore, due to image fusion, the viewer perceives a virtual binocular object with a specific depth.

Referring to FIG. 5B , the first right optical signal 16 from the second image projector 115 is replicated by the second optical replicator 125 and then reflected by the second light combining element 135 . The first redirected right light signal 16' passes through the right pupil 52 to the viewing right retina 54 to display the right pixel R34. Opposite the left light signal (the first beam of light) 36 from the first image projector 110 is reflected by the first optical replicator 120 and then by the first light combining element 130 . The first redirected left light signal 36' passes through the left pupil 62 to the viewer's retina 64 to display the left retina pixel L33. In this embodiment, the first redirected right light signal and the opposite first redirected left light signal are directed at approximately the same height of the retina of the viewer's eyes. Due to image fusion, a viewer perceives the virtual binocular object to have several depths, which can be determined by the angle between the redirected right light signals and the opposite redirected left light signals of the same object . The angle between a redirected right light signal and an opposite redirected left light signal is determined by the horizontal distance between the right pixel and the left pixel. Therefore, the depth of a virtual binocular pixel is negatively correlated with the distance between the right pixel forming the virtual binocular pixel and the opposite left pixel. In other words, the deeper the viewer perceives a virtual binocular pixel, the smaller the relative horizontal distance on the X-axis between the right pixel and the left pixel forming the virtual binocular pixel. For example, as shown in FIG. 5B , the second virtual binocular pixel 74 perceived by the viewer is deeper (ie, farther from the viewer) than the first virtual binocular pixel 72 . Therefore, on the retinal image, the horizontal distance between the second right pixel and the second left pixel is smaller than the horizontal distance between the first right pixel and the first left pixel branch. In particular, the distance between the second right pixel R41 and the second left pixel R51 forming the second virtual binocular pixel is four pixels. However, the distance between the first right pixel R43 and the first left pixel L33 forming the first virtual binocular pixel is six pixels.

As mentioned above, the present embodiment may be applied in Augmented Reality Assisted Surgery (ARAS), where images generated by the imaging display system 100, such as those originally acquired from a computed tomography scan, are superimposed on a clinical patient's corresponding section. In some cases, the distance d1 behind the first light combining element 130 is about 30-40 cm. In this application, the depth of the stereoscopic image can be fixed or limited to a relatively short distance.

When the first image projector 110 is a digital light processing (DLP) projector, the projector generates the entire image at one time, eg, 1270×720 pixels per frame, and projects to the first optical replicator 120 at the same time. The above description generally applies to the use of digital light processing projectors.

6 illustrates a method of enlarging a viewer's eye movement range. At step 610, the first image projector 110 generates an optical signal to a first optical replicator. In one embodiment, the image projector may be a laser scanning projector (LBS projector), which sequentially outputs the light signals of the image pixels one by one. In another embodiment, the image projector 110 may be a digital light processing projector that simultaneously generates all optical signals of the image (eg, a frame of 1280×720 pixels). In either embodiment, when the image projector 110 generates the light signal at a high speed, the viewer can view the image smoothly due to the persistence of vision.

At step 620, the first optical replicator 120 receives the optical signal and replicates it into N non-parallel beams of the optical signal, where N is an integer greater than one. The first optical replicator 120 also redirects the N non-parallel light beams to a first light combining element 130 . In step 630, the first light combining element 130 redirects and focuses each light beam of the optical signal to a relative viewpoint within a viewer's eye movement range. The first light combining element 130 is located between the first optical replicator and one eye of the viewer. The first optical replicator 120 and the first light combining element 130 are used for condensing N non-parallel light beams of each optical signal. For example, the first non-parallel beam of each optical signal converges to the first viewpoint and the second non-parallel beam of each optical signal converges to the second spot. The first optical replicator 120 and the first light combining element 130 are used to implement one of the following two embodiments. In one embodiment, N non-parallel light beams of an optical signal are physically converged on one point of the first light combining element 130 . In another embodiment, the N non-parallel light beams of the optical signal from the first optical replicator 120 are respectively reflected at different points of the first light combining element 130 . After being reflected by the first light combining element 130, the optical path extensions of the N non-parallel light beams of each optical signal will virtually converge at a position D1, which is at a distance d behind the first light combining element 130, The viewer's eyes are farther away.

In addition to the above three steps, in one embodiment, after step 610 and before step 620 , the method further includes a step 615 . At step 615 , a first collimator 160 causes the optical signals of several image pixels generated by the first image projector 110 to have approximately the same incident angle to the first optical replicator 120 . A first collimator can be placed in the light path between the first image projector 110 and the first optical replicator 120 to achieve this function.

In conclusion, a feature of the various image display systems described in the first embodiment is that the viewer's eyes can perceive the image/object generated from the image display system regardless of the viewpoint from which the viewer's eyes see the image. (whether in 2D or 3D) as if the image were located at the same position on the first light combining element 130 or the converging plane 135 . In other words, when the viewer's eyes move from one viewpoint to another within the eye movement range, the viewer can see the complete image/object in exactly the same position. In the case of the prior art, since the N light beams of each optical signal will be redirected in parallel to the viewpoint after being reflected by the light combining element, when the observer's eyes move from a viewpoint within the eye movement range When moving to another viewpoint, the observer perceives the object to move.

Another feature is that when N non-parallel light beams of each optical signal representing a pixel from the first optical replicator 120 converge to a point on the first light combining element 130, the first light combining element 130 has a Almost the entire range can be considered a field of view (FOV). In the prior art, N light beams representing each optical signal of a pixel are directed to different areas of a light combining element. Therefore, after being reflected by the light combining element, the N light beams of each optical signal will be emitted from the light combining element. Different points on the light combining element are redirected in parallel to this viewpoint. Therefore, only a small area of the light combining element (approximately the light combining element divided by N) can be used as the field of view.

Second Embodiment As long as the content disclosed in the first embodiment is consistent with the content disclosed in the second embodiment, it is incorporated into the second embodiment. In the second embodiment, as shown in FIG. 7A , an image display system 200 includes a first image projector 210 , a first optical reflector 220 and a first light combining element 230 . The image processor system 200 can expand the eye movement range for each viewer's eyes. By the principle of "time division", the second embodiment utilizes the fast movement of the first optical reflector 220 to receive an optical signal of an image, and by the movement of the first optical reflector 220, the optical signal will be Different incident angles are rapidly redirected to the first light combining element 230 . The first light combining element 230 is located between the first optical reflector 220 and one eye of the observer, and is used for receiving the plurality of optical signals and condensing them into a first visible area of the observer's eye to enlarge the eye of the observer The eye movement range of the viewer's eyes is 250. The moving frequency of the first optical reflector 220 is adjusted according to the projection frequency of the first image projector 210, so several optical signals of the first image will be projected to the viewer's eyes during the visual persistence time the viewable area.

The eye movement range 250 is a viewing area where a viewer's eyes 240 can see a complete image. In other words, as long as the viewer's eyes move within the eye movement range, the viewer can see a complete image. The eye movement range (visible area) may include a continuous area or several viewpoints, and a viewpoint may be separated from, close to or overlap with an adjacent viewpoint. The average adult pupil size is 2-4 cm in diameter in bright places and 4-8 cm in diameter in dark places. In one embodiment, the distance between two centrally adjacent viewpoints is about 2.6-3 cm. Those with ordinary knowledge in the art can know how to determine the number of viewpoints, the range of viewpoints, and the adjacent center two by using the pupil size, image resolution, scanning speed of the first image projector 210 and the interference effect between different light beams of the optical signal. distance between viewpoints. When the first optical reflector 220 moves continuously, the eye movement range is a continuous viewing area instead of several separate viewpoints. Therefore, when a viewer's eyes move in the visible area (eye movement range), including from one viewpoint to the next viewpoint, the viewer's eyes can continue to see the complete image without interruption.

The first optical reflector 220 may be a one-dimensional MEMS mirror, a two-dimensional MEMS mirror, a polygonal cylindrical reflector/mirror, a cylindrical reflector/mirror, and the like. The first optical reflector 220 can move in two modes. In the first mode, the optical reflector 220 is moved between N positions, each position corresponding to a viewpoint within the first viewing area (eye movement range), where N is an integer greater than one. According to the size of the viewpoint and the diameter of the pupil, the eye movement range can have several viewpoints, and the viewer can see the entire image from each viewpoint. In the second mode, the first optical reflector 220 moves continuously in a pattern repeatedly redirecting the light signal and focusing on the first viewing area of the viewer's eye.

The image display system 200 can be carried by a head-mounted device, as shown in FIG. 7B , and can be a smart glasses 280 in one embodiment. The pair of glasses has a frame 285 and a pair of lenses 290 . The mirror frame 285 carries the first image projector 210 and the first optical reflector 220 . The positions of the first image projector 210 and the first optical reflector 220 can be adjusted by the design of the light path. The lens 290 has the first light combining element 230 . In one embodiment, the first light combining element 230 and the glasses 290 can be integrated into one element. In this case, the image display system 200 can expand the eye movement range for the wearer of the head-mounted device. A viewer can see a complete image from any position, including in some cases different viewpoints (eg, 251, 252, 254) in the first viewing area (eye movement range). Furthermore, because the smart eye can be customized for the viewer, the interpupillary distance (IPD) can be adjusted for each viewer. Those skilled in the art can know that in other embodiments, the image display system 200 can be used to expand the eye movement range for several viewers at the same time.

The light source of the first optical projector 210 may be a laser, light emitting diode (LED), including mini or micro LED, organic light emitting diode (OLED), superluminescent light emitting diode (SLD), silicon-based Liquid crystal (LCoS), or liquid crystal display (LCD), or a combination of the above. In one embodiment, the first image projector 210 is a laser scanning projector (LBS projector), the projector is composed of a light source (including a red laser, a green laser and a blue laser), a Light color modifiers (such as dichroic light combiners and polarized light combiners) and a two-dimensional tunable reflector (such as MEMS mirrors). The LBS projector has a preset resolution (eg, 1280×720 pixels per frame) to sequentially generate and scan light signals one by one. Next, an optical signal of one pixel is generated and projected to the first optical replicator 220 at a time. In order for one eye of the viewer to see the 2D image, the LBS projector must sequentially generate light signals (eg 1280x720 light signals for each pixel of the first image) within the visual persistence time (eg 1/18 second) light signal). Therefore, the duration of each optical signal is approximately 60.28 nanoseconds.

In another embodiment, the first image projector 210 can be a digital light processing (DLP) projector that can generate a two-dimensional color image at a time. Texas Instruments' DLP technology is one such technology that can be used in the manufacture of DLP projectors. The complete two-dimensional color image frame, for example, may include 1280×720 pixels, and is projected to the first optical replicator 220 at the same time. Therefore, the first optical reflector 220 can simultaneously redirect several optical signals of one frame (eg, 1280×720 optical signals) to the first light combining element 230 .

The first optical reflector 220 is located and faces the optical path between the first image projector 210 and the second light combining element 230 for simultaneously receiving one or more optical signals from the first image projector 210 . The first light combining element 230 is located and faces between the first optical reflector 220 and a viewer's eye 240 for redirecting one or more light signals from the first optical reflector 220 and condensing several lights The signal is sent to the first viewing area of the viewer's eyes to expand the eye movement range of the viewer's eyes.

In the first mode, the first optical reflector 220 moves between N positions and reflects optical signals to different portions of the first light combining element 230, where N is an integer greater than one. For example, as shown in FIG. 10 , when N is equal to 5, the first optical reflector 220 moves very quickly among five positions (X1, X2, X3, X4, X5). In one embodiment, the first optical reflector 220 is a one-dimensional (1D) MEMS mirror, which repeatedly moves from X1 to X5 and then back to X1 from X5, and the pattern is X1→X2→X3→X4→ X5→X4→X3→X2→X1. When the first optical reflector 220 is located at X1, the first combined optical signal 230 reflects the optical signal and then converges to the viewpoint P1. Specifically, when the laser scanning projector scans the first complete image frame (F1), the one-dimensional MEMS mirror is still at the position X1, and then moves to the position X2. Likewise, when the first optical reflector 220 is located at X2, the first combined optical signal 230 reflects the optical signal and then converges to the viewpoint P2. Specifically, when the laser scanning projector scans the second complete image frame (F2), the one-dimensional MEMS mirror is still at the position X2. Then, the 1D MEMS mirror moves to position X3, where it scans, reflects and converges the third complete image frame (F3) to the third viewpoint P3. The first optical reflector 220 moves to position X4, where it scans, reflects and converges the fourth complete image frame (F4) to the fourth viewpoint P4. The first optical reflector 220 moves to position X5, where it scans, reflects and converges the fifth complete image frame (F5) to the fifth viewpoint P5. The first optical reflector 220 moves to position X4, where it scans, reflects and converges the sixth complete image frame (F6) to the fourth viewpoint P4. The first optical reflector 220 moves to position X3, where it scans, reflects and converges the seventh complete image frame (F7) to the third viewpoint P3. The first optical reflector 220 moves to position X2, where it scans, reflects and converges the eighth complete image frame (F8) to the second viewpoint P2. The second cycle begins when the first optical reflector 220, such as the one-dimensional MEMS mirror, returns to position X1. In order to watch a moving image smoothly, a viewer must see at least one complete image frame within the visual persistence time (eg, 1/18 second).

When the first image projector 210 is a laser scanning projector, the optical signal of each pixel will be received and reflected to the relative positions of the first optical reflector 220 one by one. In one embodiment, the first optical reflector 220 can sequentially reflect the optical signal of each pixel of a first image frame (eg, 1280×720 pixels) at the position X1 . Likewise, the first optical reflector 220 can sequentially reflect the optical signal of each pixel of a second image frame at the position X2. In this case, the first optical reflector 220 needs to stay in the same place for at least a period of time so that the laser scanning projector can scan the complete image frame.

As shown in FIG. 8 , when the first image projector 210 is a digital light processing projector, the optical signals of all pixels are received and reflected at the relative positions of the first optical reflector 220 at the same time. The first optical reflector 220 can simultaneously reflect the light signals of all pixels of a first image frame (eg, 1280×720 pixels) at the position X1, and be redirected and converged by the first light combining element 230 to the first viewpoint P1. Applies to other locations and viewpoints.

In the second mode, the first optical reflector 220 moves continuously to reflect the optical signal to different positions of the first light combining element 230 . In one embodiment, the optical reflector 220 is a one-dimensional MEMS mirror, and the optical reflector moves back and forth at both ends (eg X1→X5→X1). When the first image projector 210 is a laser scanning projector, when the first image projector moves continuously, the light signal of each pixel is received and reflected one by one.

9A-9D further illustrate the imaging process in the second mode. As described above, in the imaging process of an image frame, when the first image projector 210 (eg, a laser scanning projector) scans row by row or column by column to form the image frame, the first optical reflector 220 (eg, a one-dimensional MEMS mirror) continuously moves (rotates repeatedly in one dimension) and changes position. Referring to FIG. 9A , when the 1D MEMS mirror does not move, the image frame generated by the laser scanning projector may be rectangular. For example, line 910 represents the image pixels in the first row; line 920 represents the image pixels in the second row; and line 930 represents the image pixels in the third row. However, in the second mode, the image frame may be distorted into a parallelogram due to the movement of the 1D MEMS mirror. The reason is because the laser light projector generates an image frame by projecting one image pixel at a time; the laser light projector then changes the projection position and/or angle, scanning another image at a new position, which is usually horizontal or the immediately preceding pixel vertically. Thus, over a period of time, the laser scanning projector produces a row or column of image pixels (eg, 1280x1 or 1x720). The laser scanning projector then changes the projection position and/or angle to the next row (row-by-row scanning) or the next column (column-by-column scanning) and continues to generate the second row or second column of image pixels. This step continues until a complete image frame is generated (eg, a complete 1280x720 image pixel). However, in the second mode of the present invention, not only does the laser scanning projector change its projection position and/or angle, but the movement of the MEMS mirror also images the final shape of the image frame. In particular, due to the movement/rotation of the one-dimensional MEMS mirror, the projection start point of each row of image pixels or each column of image pixels of an image frame is shifted. As a result, the shape of the image frame, as shown in Figure 9B, may resemble a parallelogram because the movement of the mirror causes the incident angle of the optical signal traveling to the 1D MEMS mirror to change.

Referring to FIG. 9C, in some embodiments, the time (TEP, time between end points, 1/ 2f) will be set to be the same as the time (TF, time of a frame) required by the laser scanning projector to completely scan an image frame. In other words, the moving frequency of the first optical reflector (such as a one-dimensional MEMS mirror) must be adjusted according to the projection frequency of the first image projector (such as the laser scanning projector), so that the first Several light signals of the image can be projected to the viewing area in the viewer's eye during the visual persistence time. During the movement of the 1D MEMS mirror from X5 back to X1 , the laser scanning projector completes a second image frame 902 . In an embodiment of the present invention, the first image frame 901 and the second image frame 902 may contain substantially the same image information (pixels). In other words, the contents of the first image frame 901 and the second image frame 902 are substantially the same. The amount of content difference between the first image frame 901 and the second image frame 902 is determined by the frame rate of the laser scanning projector. The higher the frame rate, the smaller the difference in content between the first image frame 901 and the second image frame 902, and vice versa. In another embodiment, due to a lower frame rate, the image information of the first image frame 901 and the second image frame 902 may contain slight differences.

In addition, referring to FIG. 9C , in some embodiments, a part of the image frame may exceed the visual field boundary of the observer's eyes, and a blind spot 91 is formed in the visual field, as shown in FIG. 9C of the first image frame 901 Area A. However, because the first image frame 901 and the second image frame 902 contain substantially the same image information, part of the image information (pixels) contained in the area A may be displayed as a point in the area A' of the second image frame 902 92 Zhong sees. Therefore, the viewer can still see the complete video frame. In order for a viewer to see a complete image frame, the first image frame 901 and the second image frame 902 must be completely projected within the visual persistence time. In addition, the second image frame 902 is a refresh of the first image frame 901, wherein the image refresh rate is 1/TF. However, in other embodiments, the first and second image frames 901 and 902 may contain different image information according to the frame rate.

Referring to FIG. 9D, in another embodiment of the second mode, the time (TEP) required for the 1D MEMS mirror to move from one end point to another end point (eg X1→X5) is set to follow the laser scanning The time required by the projector to completely scan an image frame (TF) is several times, so N*TF=TEP, where N is a positive integer and TF is the time required for the laser scanning projector to scan an image frame. In this embodiment, several (N) image frames can be generated during the time when the one-dimensional MEMS mirror moves from one end point to another end point (eg, X1→X5). Since the first optical reflector 220 moves continuously to change the incident angle, the converging position of the light signals from the first light combining element 230 is changed so that it is no longer a viewpoint, and the eye movement range is expanded to a continuous visual range. District 950. FIG. 9D illustrates an exemplary embodiment in which the first, second and third image frames are continuously formed when the 1D MEMS mirror moves from X1 to X5; when the 1D MEMS mirror moves from X1 to X5 When X5 moves back to X1, the fourth, fifth and sixth image frames are continuously formed. In some embodiments, due to the high frame rate, all six image frames contain approximately the same image information (pixels). In order to make the six image frames look smooth, the first to sixth image frames must be completely scanned within the visual dwell time. However, in another embodiment, the six image frames do not contain the same image information. For example, the first, second, and third image frames may contain substantially the same image information, and the fourth, fifth, and sixth image frames may contain substantially the same image information. As mentioned above, some image frames may contain a blind spot 91 . However, since the remaining image frames may contain the same image information, the image information (pixels) of the blind spot 91 can be filled by a part of other image frames, so the viewer can still see the complete image frame.

In order for a viewer to see the complete image, the viewer sees all the different parts of a complete image within the visual dwell time (eg, 1/18 of a second). A complete image frame can be automatically spliced from different parts seen by the eyes of a viewer located in a first viewing area. However, these different parts may come from different image frames. Since the content of different image frames is very similar to each other due to the high frame rate, it is difficult for a viewer to distinguish different parts from different image frames. In addition, in order for a viewer to watch a moving image smoothly, the viewer must see at least one complete image frame at the same position in the first viewing area within the visual persistence time (eg, 1/18 second) . Furthermore, in order for a viewer to see better image quality, it is necessary to reduce interference effects and provide phase offset compensation. One way to reduce interference effects is to synchronize the frequency of the laser scanning projector with the round-trip frequency (X1→X5→X1) of the 1D MEMS mirror. For example, if the image projector 210 is generating a first optical signal of an image frame, the optical reflector 220 starts to move from the starting position X1 so that the first optical signal can be at the first viewpoint P1 be seen, so better synchronization can improve image quality.

When the first image projector 210 is a digital light processing projector, the light signals of all pixels are simultaneously received and reflected to the relative positions of the first optical reflector 220 . Therefore, at any time when the first optical reflector 220 continues to move, the optical signals of all pixels of an image frame (eg, 1280×720 pixels) can be simultaneously reflected by the first optical reflector 220 and then by the first light combining element 230 is redirected and converged to the viewable area of the viewer's eye. When the first optical reflector 220 is a one-dimensional MSM mirror and continuously moves between two end points (eg, X1 and X5 ), the optical signal of the image frame will be converged to the first visible area.

In another embodiment of the second mode, the first optical reflector 220 is a polygonal column reflector, and the reflector continuously rotates clockwise or counterclockwise to reflect the light signal to the first light combining element 230, The light combining element 230 redirects and concentrates the light signal to the first viewing area 1100 of a viewer's eye to expand the eye movement range of the viewer's eye. However, for convenience of explanation, the continuous first viewable area is divided into five viewpoints. When the first image projector 210 is a laser scanning projector and the first optical reflector 220 is a pentagonal reflector, when the first optical reflector 220 moves continuously, the optical signal of each pixel is transmitted one by one. Receive and reflect. The pentagonal reflector has five faces. Therefore, during the first period of time, the first optical reflector 220 continues to move from the starting point X10 of the first face of the pentagonal reflector to the ending point X15 of the same face, The light signal of the first part (eg, the first 1/5) of the first image frame is reflected and redirected to the spatial range of the first viewpoint P1. During the second period of time, the first optical reflector 220 continues to move toward the end point X15 of the first surface, and the optical signal of the second part (for example, the second 1/5) of the first image frame will be reflected and reproduced Oriented to the spatial extent of the second viewpoint P1. Similarly, in the fifth time period, the first optical reflector 220 continues to move toward the end point X15 of the first surface, and the optical signal of the fifth part (eg, fifth 1/5) of the first image frame will be is reflected and redirected to the spatial extent of the fifth viewpoint P5. Then the pentagonal column reflector continues to turn to the starting point X20 of the second surface of the pentagonal column reflector. At the same time, the optical signal of the second image frame has scanned the front end of the second part (eg, the second 1/5), which means that in the sixth time period, the first optical reflector 220 continues to radiate from the second surface. The start point X20 moves to the end point X25 of the second surface, and the optical signal of the second part (for example, the second 1/5) of the second image frame will be reflected and redirected to the spatial range of the first viewpoint P1 . Similarly, in the seventh time period, the first optical reflector 220 continues to move toward the end point X25 of the second surface, and the optical signal of the third part (eg, the third 1/5) of the second image frame is will be reflected and redirected to the spatial extent of the first viewpoint P2. Finally, in order for a viewer to see a complete image, the viewer needs to see different parts of a complete image (such as the first 1/5, the second 1/5, third 1/5, fourth 1/5 and fifth 1/5). However, these different parts may come from different image frames. Because these different image frames are very close together on the timeline, it is difficult for a viewer to see that different parts come from different image frames. In addition, in order for a viewer to watch the moving image smoothly, the viewer must see a plurality of complete image frames in the first viewing area 1100 within the visual persistence time (eg, 1/18 second).

As described above, in the second mode, in the case where the first image projector 210 of the second mode uses a laser scanning projector, in order to allow a viewer to see better image quality, it is necessary to reduce the interference effect And provides phase offset compensation. One way to reduce interference effects is to synchronize the frequency of the laser scanning projector, the number of faces of the pentagonal reflector, and the frequency of rotation. For example, if the first optical reflector 220 starts to move from the starting position X1 of each side of the pentagonal reflector, at the same time the first image projector 210 starts to generate an optical signal of an appropriate part of an image frame, As described in the previous paragraph, in this way, the complete image frame can be seen at each point of the first viewable area 1100, so that better synchronization can improve the image quality.

As shown in FIG. 11A , when the first image projector 210 is a digital light processing projector and the first optical reflector 220 is a pentagonal reflector. The light signals of all the pixels are received and reflected to the corresponding positions of the first optical reflector 220 at the same time. As described above, since the pentagonal reflector moves continuously, the first visible area 1100 in FIG. 11B is a continuous area. However, for convenience of explanation, the continuous first viewable area 1100 is conceptually divided into five viewpoints. The pentagonal reflector has five faces. When the starting point X10 of the first surface of the pentagonal reflector receives the light signals from all the pixels of the first image projector 210, the first light combining element 230 will redirect and condense the light signals to the first image projector 210. The front end of the spatial extent of a viewpoint P1. When the pentagonal reflector continues to move toward the end point X15 of the first surface of the pentagonal reflector, the first light combining element 230 will redirect and condense the light signal of the pixel to the end of the spatial range of the last viewpoint P5 end. Then the pentagonal reflector continues to rotate and the starting point X20 of the second surface of the pentagonal reflector receives light signals from all pixels of the first image projector 210 , and the first light combining element 230 is redirected And gather these optical signals back to the front end of the spatial range of the first viewpoint P1. When the pentagonal column reflector continues to move toward the end X25 of the second surface of the pentagonal mirror reflector, the first light combining element 230 will also redirect and condense the light signal of the pixel to the spatial range of the last viewpoint P5 tail end. When the pentagonal reflector continues to rotate to the third, fourth and fifth surfaces, the same steps are repeated. According to the frame rate and the rotation speed of the first image projector 210, the viewer can see one or more image frames during the time period when the same side of the pentagonal reflector receives the optical signal. In addition, in order for a viewer to watch a moving image smoothly, the viewer must see a plurality of complete image frames from the same viewpoint within the visual persistence time (eg, 1/18 second).

Those skilled in the art should know that, especially when the optical reflector 220 is a polygonal column reflector, several image display systems can be implemented simultaneously to expand the eye movement range of several viewers.

The first light combining element 230 can be made of a glass or plastic material as a lens, and is coated with a specific material such as metal to make it partially transparent and partially reflective. The first light combining element 230 can be a holographic beam splitter but it is not the best choice because the diffraction effect will cause several shadows and RGB shifts. In some embodiments, the use of holographic beamsplitters is avoided.

As shown in FIG. 8 or FIG. 11A , the image display system 200 may further include a first collimator 260 located on the first image projector 210 and the first optical reflector 220 to make the light The direction of motion of the signal is more consistent (parallel) in a particular direction. In other words, the light signals from different pixels of the first image projector 210 become substantially parallel after passing through the first collimator 260 . Therefore, the first collimator 260 makes the incident angle of each optical signal to the first optical reflector 220 approximately the same. The first collimator 260 can be a curved lens or a convex lens.

As mentioned above, the image display system 200 with the first image projector 210 , the first optical reflector 220 and the first light combining element 230 can expand the eye movement range for the viewer. In one embodiment, the image display system 200 may further include a second image projector 215, a second optical reflector 225 and a second light combining element 235, which are connected with the first image projector 210, the first The optical reflector 220 and the first light combining element 230 function in the same way to expand the eye movement range for another point of the viewer. Likewise, the second image projector generates light signals for a second image. The second optical reflector is used for receiving a plurality of optical signals generated by the second image projector, and by moving the second optical reflector, the plurality of optical signals are redirected to a second optical signal at different incident angles Lighting element. The second light combining element is located between the second optical reflector and one eye of the observer, and the light combining element is used for receiving and converging the plurality of optical signals to a second visible area of the other eye of the observer , to expand the eye movement range of the viewer's other eye. In addition, the moving frequency of the second optical reflector is adjusted according to the projection frequency of the second image projector, so that several optical signals of the second image can be projected to the viewer during the visual persistence time. A second viewable area in a point.

In addition, the second image projector has a similar structure to the first image projector; the second optical reflector has a similar structure to the second optical reflector; the second light combining element and the first light combining element Components have a similar structure. Therefore, the image display system 200 can simultaneously expand the eye movement range of the left and right eyes of the viewer.

The image projector system 200 can include a support structure that can be worn on the viewer's head to carry the first image projector 210, the second image projector 215, the first optical reflector 220, the second image projector The optical reflector 225 , the first light combining element 230 and the second light combining element 235 . The first light combining element 230 and the second light combining element 235 are located in the viewer's field of view. Therefore, in this embodiment, the image display system 200 is a head mounted device (HWD). In particular, as shown in FIG. 7B , the image display system is carried by a pair of glasses, which are called smart glasses. In this case, the support structure may be a pair of frames, possibly with lenses, which may be prescription lenses for the correction of nearsightedness or farsightedness or the like. The first image projector 210 and the first optical reflector 220 are carried by the right temple, and the second image projector 215 and the second optical reflector 225 are carried by the left temple. The first light combining element 230 can be carried by the right lens and the second light combining element 235 can be carried by the left lens. The bearing can be realized in various ways, and the light combining element is movably or fixedly connected or integrated on the lens. The light combining element can be combined with lenses, including prescription lenses. When the support structure does not contain a lens, the right light combining element and the left light combining element can be directly carried by the frame or the edge.

Similar to the first embodiment, the image display system 100 of the viewer's eyes is used to display an object with depth. Because the depth of the object is the same as where the viewer's eyes are looking, vergence accommodation conflicts (VAC) and focus competition can be avoided. In this embodiment, an optical signal collected from the second light combining element 235 is a first redirected right light signal, and a relative light signal collected from the first light combining element is a first redirected left light Signal. The first redirected right light signal and the first redirected left light signal are perceived by the viewer to display a first virtual binocular pixel of an object with a first depth that corresponds to the first redirected right light A first angle between the signal and the opposite first redirected left light signal is related. Generally speaking, the first depth is determined by the relative horizontal distance between the first redirected right light signal and the opposite first redirected left light signal.

Figure 12 illustrates a method of enlarging a viewer's eye movement range. At step 1210 , the first image projector 210 generates a plurality of optical signals to a first optical reflector 220 . In one embodiment, the image projector 210 may be a laser scanning projector (LBS projector), which sequentially outputs the light signals of the image pixels one by one. In another embodiment, the image projector 210 may be a digital light processing projector and simultaneously generate all light signals of the image (eg, a frame of 1280×720 pixels). In either embodiment, when the image projector 210 generates the light signal at a high speed (eg, 60 frames per second), the viewer can view the image smoothly due to persistence of vision.

At step 1220 , the first optical reflector 220 receives the optical signal and redirects the optical signal to different parts of the first light combining element 230 as the first optical reflector 220 moves. The first optical reflector 220 can be a one-dimensional MEMS mirror, a two-dimensional MEMS mirror, a polygonal column reflector/mirror, a cylindrical reflector/mirror, and the like. The first optical reflector 220 can move in two modes. In the first mode, the first optical reflector 220 moves between N positions, each position corresponding to a viewpoint, where N is an integer greater than one. In the second mode, the first optical reflector 220 moves continuously in a pattern, so that the first light combining element 230 can repeatedly redirect and focus the light signal to a first visible area of the viewer's eyes to enlarge The eye movement range of the viewer's eyes.

In step 1230, when the first optical reflector 220 moves, the first light combining element 230 reflects and concentrates the plurality of light signals to a first viewing area of the viewer, so as to enlarge the eye movement of the viewer's eyes scope. The first light combining element 230 is located between the first optical reflector 220 and the viewer's eye.

In addition, the moving frequency of the first optical reflector is adjusted according to the projection frequency of the first image projector, so that several optical signals of the first image can be projected to the viewer's eyes within the visual persistence time the first visible area.

In addition to the above three steps, in one embodiment, after step 1210 and before step 1220 , the method further includes step 1215 , making the optical signals of several image pixels have substantially the same incident angle to the first optical reflector 220 . A first collimator can be positioned in the light path between the first optical projector 210 and the first optical reflector 220 to achieve this function.

In summary, a feature of this method is that almost the entire range of the first light combining element 230 can be regarded as a field of view (FOV). The first optical reflector 220 redirects the optical signal of a complete image to almost all areas of the light combining element 230, which concentrates the optical signal to a first visible area of a viewer. When the first optical reflector 220 is moved, the light signal of a complete image is redirected to slightly different parts of the first light combining element 230 . Therefore, considering the movement of the first optical reflector 220, a certain area of the light combining element 230 needs to be reserved. Except for the reserved area, the remaining area of the first light combining element 230 can be regarded as a field of view (FOV). The foregoing description of the embodiments is provided to enable those of ordinary skill in the art to make and use the present invention. Various modifications to this embodiment will be readily apparent to those skilled in the art, and the underlying principles identified herein may be applied to other embodiments without inventive step. Thus, the claimed subject matter is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Other embodiments are envisioned within the spirit and scope of the present disclosure. Accordingly, the present invention is intended to cover modifications and variations within the scope of the appended patent claims and their equivalents.

100: Graphic Display System 110: The first image projector 115: Second image projector 120: First Optical Replicator 1210: Steps 1215: Steps 1220: Steps 1230: Steps 125: Second Optical Replicator 130: The first light combining element 135: The second light combining element 140: Eyes 150: Eye movement range 151: Viewpoint 152: Viewpoint 153: Viewpoint 16: The first right light signal 16': The first redirection right light signal 160: First collimator 165: Second Collimator 18: The second right light signal 18': Second redirection right light signal 180: Smart Glasses 185: Frame 190: glasses lens 200: Image Display System 210: First Image Projector 215: Second Image Projector 220: First Optical Reflector 225: Second Optical Reflector 230: The first light combining element 235: The second light combining element 240: Eyes 250: Eye movement range 251: Viewpoint 252: Viewpoint 254: Viewpoint 260: First Collimator 280: Smart Glasses 285: Frame 290: Lenses 36: First left light signal 36': 1st redirect left light signal 38: Second left light signal 38': Second redirection left light signal 52: Right pupil 54: Right retina 60: Left eye 610: Steps 615: Steps 62: Left pupil 620: Steps 630: Steps 64: Left retina 70: Dinosaurs 72: The first virtual binocular pixel 74: Second virtual binocular pixel 901: First image frame 902: Second image frame 91: Blind Spot 910: Line 92: point 920: Line 930: Line 950: Viewable area ϴ1: The first angle ϴ 2: The second angle C1: point C11: point C12: point C13: point C2: point C21(L): point C21(R): point C22 (L): point C22 (R): point C23 (L): point C23 (R): point C3: point D1: point d1: first depth D2: point d2: second depth F1: The first complete image frame F2: Second complete image frame F3: The third complete image frame F4: Fourth complete image frame F5: Fifth complete image frame F6: sixth complete image frame F7: Seventh complete image frame F8: Eighth complete image frame L1: the first optical signal L2: second optical signal L3: the third optical signal LL2: Left light signal P1: First View P1(L): Left view point P1(R): Right view point P2: Second View P2(L): Left view point P2(R): Right view point P3: Third Viewpoint P3(L): Left View P3(R): Right View P4: Fourth Viewpoint P5: The Fifth View RL2: Right light signal RL21: Beam RL22: Beam RL23: Beam RLL21: Reset left light signal RLL22: Reset left light signal RLL23: Reset left light signal RRL21: Redirect right light signal RRL22: Redirect right light signal RRL23: Redirect right light signal RS11: First reflected beam RS12: Second reflected beam RS13: Third reflected beam S11: First beam S12: Second beam S13: Third beam S21: First beam S22: Second beam S23: Third beam S31: First beam S32: Second beam S33: Third beam X1: Location X2: Location X3: Location X4: Location X5: Location

FIG. 1A is a schematic diagram illustrating an embodiment of an image display system of the present invention having a first optical replicator. FIG. 1B is a schematic diagram illustrating an image display system carried by a pair of glasses according to the present invention. 2 is a schematic diagram illustrating an embodiment of an image display system with a beam splitter of the present invention 3 is a schematic diagram illustrating an embodiment of an image display system of the present invention, the system has a polarizer, wherein N beams of an optical signal are converged on a first light combining element. 4 is a schematic diagram illustrating an embodiment of an image display system of the present invention, in which the extensions of N non-parallel beam paths of the optical signal converge to a virtual converging plane behind the first light combining element. FIG. 5A is a schematic diagram illustrating an image display system for a viewer's eyes to perceive the depth of an object according to the present invention. 5B is a schematic diagram illustrating an image display system for both eyes of a viewer to perceive two virtual binocular pixels of an object with depth according to the present invention. 6 is a flow chart illustrating the flow of an embodiment of the present invention for expanding the eye movement range for a viewer's eye through an image display with a first optical replicator. 7A is a schematic diagram illustrating an embodiment of an image display system of the present invention, the system having a first optical reflector. FIG. 7B is a schematic diagram illustrating an image display system carried by a pair of glasses according to the present invention. 8 is a schematic diagram illustrating an embodiment of an image display system of the present invention, wherein a first image projector is a digital light processing projector. 9A-D are schematic diagrams illustrating one embodiment of an image display system with a continuously moving optical reflector of the present invention that displays image pixels. 10 is a schematic diagram illustrating an embodiment of an image display system of the present invention that generates several viewpoints in a viewing area. FIG. 11A is a schematic diagram illustrating an embodiment of an image display system of the present invention with a pentagonal column reflector. FIG. 11B is a schematic diagram illustrating an embodiment of an image display system with a pentagonal column reflector of the present invention that generates a first viewing area. 12 is a flow chart illustrating the flow of an embodiment of the present invention that uses an image display system with a pentagonal reflector to expand the eye movement range for an observer's eyes.

100: Graphic Display System

110: The first image projector

115: Second image projector

120: First Optical Replicator

125: Second Optical Replicator

130: The first light combining element

135: The second light combining element

140: Eyes

150: Eye movement range

151: Viewpoint

152: Viewpoint

153: Viewpoint

Claims (37)

An image display system for expanding eye movement range, the system includes: a first image projector for generating a plurality of optical signals of a first image; a first optical replicator, comprising at least one optical element for receiving the optical signal generated by the first image projector, the optical replicator replicates the optical signal into N non-parallel light beams, and redirecting each of the N light beams of the optical signal to a first light combining element, wherein N is an integer greater than one; and The first light combining element is located between the first optical replicator and one eye of the viewer, and the light combining element is used for receiving N light beams of the optical signal and converging them to the eye of the viewer respectively N viewpoints in the eye movement range. The image display system as described in claim 1, further comprising: A second image projector for generating a plurality of optical signals for a second image: A second optical replicator including at least one optical element for receiving the optical signal generated by the second image projector, the optical replicator reproduces the optical signal into M non-parallel light beams, and the light each of the M beams of the signal is redirected to a second light combining element, wherein M is an integer greater than one; and The second light-combining element is located between the first optical replicator and the other eye of the viewer, and the light-combining element is used for receiving M viewpoints of the optical signal. The image display system as claimed in claim 2, wherein the light signal redirected from the second light combining element is a first redirected right light signal, and the relative light signal redirected from the first light combining element is A first redirected left light signal, and the first redirected right light signal and the first redirected left light signal are perceived by the viewer to display a first virtual binocular pixel of an object, a first A depth is related to a first angle between the first redirected right light signal and the opposite first redirected left light signal. The image display system as claimed in claim 1, wherein the N non-parallel light beams of the optical signal from the first optical replicator are physically converged on the first light combining element, or by the first combining element. The extension of the N non-parallel beam paths of the optical signal redirected by the optical element will virtually converge to a converging plane behind the first light combining element, the converging plane being farther from the observer's eyes. The image display system as described in claim 4, wherein no matter the viewer's eyes view the image from any viewpoint, the viewer can perceive the image at the same position of the light combining element or the convergence plane . The image display system as described in claim 1, wherein the viewer's field of view covers more than 80% of the first light combining element. The image display system as claimed in claim 1, wherein the first optical replicator is composed of one or more beam splitters, polarizers, half-coated mirrors, half-reflectors, dichroic mirrors, and dichroic optical coatings , a dielectric optical coating, or a combination of the above. The image display system as claimed in claim 1, wherein N is equal to 3 and the optical replicator is a beam splitter comprising two partial reflectors and a total reflector, dividing the optical signal into three beams . The image display system as recited in claim 1, wherein the optical replicator is a polarizer. The image display system as claimed in claim 1, wherein a light source of the first image projector is a laser, light emitting diode (LED), organic light emitting diode (OLED), superluminescent light emitting diode bulk (SLD), liquid crystal on silicon (LCoS), or liquid crystal display (LCD), or a combination of the above. The image display system as claimed in claim 1, wherein the first image projector is a laser scanning (LBS) projector or a digital light processing (DLP) projector. The image display system as claimed in claim 1, wherein the first light combining element is not a holographic beam splitter. The image display system as claimed in claim 1, further comprising a first collimator, the collimator is disposed between the first image projector and the first optical replicator to make the movement of the optical signal The direction is more aligned with a specific direction. The image display system as described in claim 2, further comprising: a support structure that can be worn on the observer's head; wherein the first image projector, the second image projector, the first optical replicator and the second optical replicator are carried by the support structure; and The first light-combining element and the second light-combining element are carried by the support structure and arranged in the viewer's field of vision. The image display system as claimed in claim 14, wherein the support structure is a pair of glasses. The image display system as claimed in claim 15, wherein the pair of glasses has a prescription lens with the first light combining element or the second light combining element. A method of displaying an image, comprising: generating an optical signal to a first optical replicator through a first image projector; Replicating the optical signal through the first optical replicator to make it into N non-parallel light beams, wherein N is an integer greater than 1, and redirecting the N non-parallel light beams to a first light combining element; Redirecting and converging each of the N non-parallel light beams of the optical signal to a relative viewpoint in the eye movement range of a viewer through the first light combining element, the first light combining element is arranged on the first light beam between the optical replicator and the viewer's eye. The method of claim 17, wherein (1) N non-parallel light beams of the optical signal are physically converged on the first light combining element, or (2) N non-parallel light beams of the optical signal are The extension of the beam path converges to an imaginary converging plane behind the first light combining element, the converging plane being farther from the observer's eye. The method as described in claim 17, further comprising: The optical signals from the first image projector are made to have approximately the same angle of incidence to the first optical replicator. An image display system for expanding eye movement range, comprising: a first image projector that generates a plurality of optical signals for a first image; a first optical reflector including at least one optical element for receiving a plurality of optical signals generated by the first image projector and redirecting the plurality of optical signals to a first light combining element , the movement of the first optical reflector will cause the incident angles of the plurality of optical signals to be different; The first light combining element is located between the first optical reflector and one eye of the viewer, and is used for receiving and converging the plurality of optical signals to a first viewing area of the viewer's eye to enlarge the viewer's eye range of eye movements; and The moving frequency of the first optical reflector is adjusted according to the projection frequency of the first image projector, so that the plurality of optical signals of the first image are projected to the visible area of the viewer's eyes within the visual persistence time . The image display system as described in claim 20, further comprising: a second image projector that generates a plurality of optical signals for a second image; a second optical reflector including at least one optical element for receiving a plurality of optical signals generated by the first image projector and redirecting the plurality of optical signals to a second light combining element , the movement of the first optical reflector will cause the incident angles of the plurality of optical signals to be different; The second light combining element is located between the second optical reflector and the other eye of the viewer, and is used for receiving and converging the plurality of optical signals to a first viewing area of the viewer's eye to enlarge the viewer the eye movement range of the other eye; and The moving frequency of the second optical reflector is adjusted according to the projection frequency of the second image projector, so that the plurality of optical signals of the second image are projected to the viewer's other eye within the visual persistence time. a second viewing area. The image display system as claimed in claim 21, wherein a light signal collected from the second light combining element is a first redirected right light signal, and a relative light signal collected from the first light combining element is A first redirected left light signal, and the first redirected right light signal and the first redirected left light signal are perceived by the viewer to display a first virtual binocular pixel of an object, the depth of which is the same as the depth of the first redirected left light signal. A first angle between a redirected right light signal and the opposite first redirected left light signal is related. The image display system as described in claim 20, wherein the first optical reflector moves back and forth between N positions, so that the plurality of optical signals are projected through the first light combining element to the viewer's eye respectively. N viewpoints in the first viewing area, and N is an integer greater than 1. The image display system as recited in claim 23, wherein when the first optical reflector is in a relative position, the first image is projected to a specific viewpoint. The image display system of claim 23, wherein the first optical reflector is a one-dimensional microelectromechanical system (MEMS) mirror. The image display system as claimed in claim 20, wherein the first optical reflector moves continuously in a predetermined manner to redirect the plurality of optical signals to the first light combining element, the first optical reflector The continuous movement of , causes the incident angles of the several optical signals to be different. The image display system as recited in claim 20, wherein the first optical reflector is a one-dimensional microelectromechanical system (MEMS) mirror, a two-dimensional MEMS mirror, a polygonal cylindrical reflector, or a cylinder reflector. The image display system as claimed in claim 20, wherein a light source of the first image projector is a laser, light emitting diode (LED), organic light emitting diode (OLED), superluminescent light emitting diode bulk (SLD), liquid crystal on silicon (LCoS), or liquid crystal display (LCD), or a combination of the above. The image display system of claim 20, wherein the first image projector is a laser scanning (LBS) projector or a digital light processing (DLP) projector. The image display system as described in claim 20, further comprising a first collimator, the collimator is disposed between the first image projector and the first optical replicator to make the movement of the optical signal The direction is aligned with a specific direction. The image display system as described in claim 21, further comprising: a support structure that can be worn on the observer's head; wherein the first image projector, the second image projector, the first optical replicator and the second optical replicator are carried by the support structure; and The first light-combining element and the second light-combining element are carried by the support structure and arranged in the viewer's field of vision. The image display system as claimed in claim 31, wherein the support structure is a pair of glasses. The image display system as claimed in claim 32, wherein the pair of glasses has a prescription lens with the first light combining element or the second light combining element. A method of displaying an image, comprising: generating a plurality of optical signals to a first optical replicator through a first image projector; moving the first optical reflector to redirect the plurality of optical signals to the first light combining element at different incident angles; Redirecting and collecting the plurality of optical signals through the first light combining element disposed between the first optical reflector and the viewer's eye, and receiving and collecting the plurality of optical signals to a first light signal of the viewer's eye a viewing area to expand the eye movement range of the viewer's eyes; and The moving frequency of the first optical reflector is adjusted according to the projection frequency of the first image projector, so that the plurality of optical signals of the first image are projected to the visible area of the viewer's eyes within the visual persistence time . The method as recited in claim 34, wherein the first optical reflector moves back and forth between N positions so that the plurality of optical signals are projected through the first light combining element to the first portion of the viewer's eye, respectively N viewpoints in the viewable area, and N is an integer greater than 1. The image display system as claimed in claim 34, wherein the first optical reflector moves continuously in a predetermined manner to redirect the plurality of optical signals to the first light combining element, the first optical reflector The continuous movement of , causes the incident angles of the several optical signals to be different. The method as described in claim 34, further comprising: The plurality of optical signals from the first image projector are made to have approximately the same angle of incidence to the first optical replicator.

Images