CN1570691A - Monolithic birefringent image display device - Google Patents

Abstract

A unitary birefringent image display device, comprising: a display unit for providing an image; two first refractor set located at one side of the display unit; two first reflection units located at the same side of the display unit relative to the first refractive optical elements; two second reflection units; two second refractor sets located at one side of the second reflection unit; two virtual image forming lens groups respectively positioned at the other sides of the two second refractor groups; the image displayed by the display unit is refracted by the first refractive optical elements to form an inverted image with the original image, then reflected by the first reflective optical elements and reflected by the second reflective optical elements to the second refractive optical elements, and then deflected by the refractive optical elements to form a virtual image which has the same vertical direction as the original image and the same left-right direction, and is converted into a virtual image which has the same vertical direction as the original image and the same left-right direction through the virtual image forming optical elements.

Description

Monolithic birefringent image display device

technical field

The invention relates to a single birefringence image display device, especially an image display device suitable for glasses type or head mounted type.

Background technique

In recent years, various audio-visual equipment and display devices have been improved with each passing day. In addition to enhanced functions, thin, light, small, and portable displays are also the mainstream of display development; one of the emerging display devices is virtual reality (virtual reality) technology. The integration of various technologies, such as display technology, computer technology, sensory technology, and sound effect technology, reduces the original large-sized audio-visual equipment to a square inch and becomes a portable glasses-type projection display device. Although the general flat panel display is light in weight, its size is limited by material weight and cost, and it cannot achieve the effect of enlarging the image size and being easy to carry at the same time. Therefore, the current display cannot meet the market's consumer demand for large-scale image display. Recently, many industry players have become optimistic about projection displays, especially glasses-type displays, because they are small in size, but they can use the combination of optical components to allow users to achieve the viewing effect of a large-size screen. It is generally expected that the glasses-type display can save the occupied space of the general display and greatly reduce the weight of the display to achieve the same effect, so as to meet the needs of advanced audio-visual. However, although the current glasses-type projection display device is light in weight, it is still too heavy to wear on the head.

In the past, glasses-type displays were erected in front of the user's eyes by two small-sized CRT image tubes, shortening the distance between the CRT and the eyes to achieve the effect of enlarging the size. But this kind of design is not practical for the heavy load on the user's head, and the radiation is strong. Existing general glasses type projection display device adopts plane display device, and its principle is as shown in Figure 1, comprises a liquid crystal display 110, a two-way beam splitter 120, a polarizing beam splitter 130, a projection lens 140 and two flat mirrors or concave surfaces Mirrors 150,160. The image provided by the liquid crystal display 110 is reflected twice through the two mirrors 150 and 160 to project the image into the observer's eyes. However, the final image formed by this projection method is a real image. When used at close range, the lens of the eye will be forced to bend and oppress the eyeball; please refer to Figures 2a to 2e. This is the existing Doppler effect on the human eye. Schematic diagram of the action. Just like a video recorder or camera used by many people at the same time, when the user holds the camera and tries to focus while moving, the lens of the camera will always adjust its focus back and forth, because the camera has to try to figure out which parts It is the subject to be photographed, the distance between the subject and the camera, etc., in order to correctly adjust the focus and shoot a clear image. The human eye is just like the lens of a camera. It must quickly adjust the curvature of the crystal and the length of the eye axis at any time to adapt to scenes at different distances. As shown in Figure 2a, when the image of the object seen by the eyes is a static real image 6, the eyeball 5 and the lens 51 remain in a normal state; then please refer to Figure 2b, when the real image 61 and the eyeball 501 are in a relative movement, In order to catch the correct image, the eyeball 501 must quickly adjust the length of the eye axis and the curvature of the crystal 511. As shown in FIG. The curvature becomes shorter; or as shown in Figure 2d, the curvature of the crystal 513 becomes thicker and rounder, and the axial length of the eyeball 503 becomes longer in order to adapt to the curvature of the crystal 513; finally, as shown in Figure 2e, the crystal 514 adjusts When a correct curvature is reached, the eye axis is adjusted to the state of 504 accordingly. During the adjustment process, since the moving speed of the object is higher than the eyeball adjustment speed, there will be an afterimage 62 , that is, the existing Doppler effect. Moreover, in the process of quickly adjusting the focus, a large amount of blood flowing through the microvessels around the eyeball will cause pressure on the eyeball. The high intraocular pressure caused by long-term and frequent adjustment of the focus will not only cause discomfort to the human eye, In severe cases, there may be a risk of retinal detachment! Therefore, if this kind of real image projection device is applied to a glasses-type display device, when the observation time (within a few hours) is prolonged, the intraocular pressure of the observer will increase, resulting in symptoms of dizziness and discomfort, and even severe retinal detachment. Therefore, it is not suitable for young children or those with heart disease or high blood pressure. However, if the real image is projected on the eyeball, if the magnification is to be increased, the distance between the projection lens group and the eyeball needs to be lengthened. In this way, if the image magnification is to be increased, the space occupied by the projection system needs to be increased, which is not practical. Not practical.

In addition, when the user's head moves, the display device for forming a projected real image will produce image blur or serious shaking due to ghosting and Doppler effect, so the display quality is not good, and the application field is not wide. Therefore, there is still a need for a new display device in the market, which can effectively magnify the image provided by the microdisplay and maintain high resolution. Symptoms of elevated blood pressure.

Because of this, the inventor, based on the spirit of active invention, desperately thought of a "single birefringence image display device" that can solve the above-mentioned problems, and finally completed the invention after several researches and experiments.

Contents of the invention

The main purpose of the present invention is to provide a single birefringent image display device, which can effectively magnify the image provided by the microdisplay, occupy a small space, maintain image resolution, avoid oppressing the eyeball, prolong the use time, and have low material cost and low power consumption. Low power consumption, easy magnification adjustment, high image brightness contrast, reduced Doppler and ghost effects, suitable for glasses-type or head-mounted display devices.

In order to achieve the above-mentioned purpose, the "single birefringence imaging display device" of the present invention mainly includes: a display unit; two first refracting mirror groups, located on one side of the display unit, for deflecting the light emitted by the display unit Two first reflection units, located on the same side of the display unit relative to the first refracting mirror group, are used to reflect the light emitted by the first refracting mirror group, and wherein the first refracting mirror group is interposed between the first refracting mirror group Between the reflector group and the display unit; two second reflective units, used to deflect light emitted from the first reflective unit, wherein the two first reflective units are located between the two second reflective units; two second reflective units The refracting mirror group is located on one side of the second reflecting unit, but the second refracting mirror group is not located on the straight line formed by the second reflecting unit and the first reflecting unit, and is used to respectively deflect light transmitted or reflected; and two virtual image imaging mirror groups, which are respectively located on the other side of the two second refracting mirror groups to deflect the light rays served by the second refracting mirror group, and the virtual image imaging mirror group The image formed by the second refracting mirror group is converted into a virtual image; wherein, the second refracting mirror group is located between the second reflecting unit and the virtual image imaging mirror group; and the image displayed by the display unit is obtained through the The first refracting mirror group refracts to form an inverted image with the original image, and then reflects through the first reflection unit and the second reflection unit to the second refracting mirror group, and passes through the refracting mirror group to form a refraction image. The real image that is upright to the original image is converted into a virtual image that is upright to the original image through the virtual image imaging mirror group.

The above-mentioned display device can be applied to any purpose or equipment for displaying images, pictures, symbols and text, and is preferably an information display device for a TV, a computer, a printer, a screen, an information display device for a vehicle, or a signal Machines, information display devices for communication equipment (such as wireless mobile phones, telephones), information display devices for telephones, interactive e-books, microdisplays, displays for fishing equipment, personal digital assistants, virtual game), information display device for virtual flight training, display of aircraft (airplane) equipment, display of game goggles, etc.

Because the present invention has a novel structure, can provide industrial utilization, and has indeed enhanced effects, it applies for an invention patent according to law.

Description of drawings

In order to allow examiners to better understand the technical content of the present invention, the preferred specific embodiments are described as follows, among which:

FIG. 1 is a conventional image projection display device.

2a, 2b, 2c, 2d, 2e are schematic diagrams of the Doppler effect of the human eye.

FIG. 3 is a schematic diagram of a real image viewed by human eyes.

4a, 4b, 4c are schematic diagrams of virtual images viewed by human eyes.

Fig. 5 is a schematic diagram of a direct enlarged projection with a convex lens.

Fig. 6 is a schematic diagram of conventional reflection projection with a concave mirror.

FIG. 7 is a schematic diagram of the present invention projected by refraction.

8 is a cross-sectional view of the interior of the glasses-type image display device of the present invention.

FIG. 9 is a top view of the interior of the glasses-type image display device of the present invention.

FIG. 10 is a side view of the interior of the glasses-type image display device of the present invention and the principle of virtual image formation.

FIG. 11 is a schematic diagram of the assembly of the glasses-type image display device of the present invention.

FIG. 12 is a schematic diagram of another assembly of the glasses-type image display device of the present invention.

Detailed ways

Please refer to Fig. 3 and Fig. 4 first, which are schematic diagrams showing the difference between the real image and the virtual image formed by the eye. Fig. 3 shows the situation of the real image 4 projected by the existing projection system. When the eyes regard it as a real image, the eyes must adjust the focus correctly so that the image is imaged on the retina in order to "see" the image 41, and as analyzed in the previous section As mentioned above, the process of focusing will bring pressure to the eyes. 4a to 4c are virtual images viewed by the eyes of the present invention. In this case, when the imaging mirror group (concave mirror) 260 is transparent, the real image 142 projected by the display unit (not shown) will form a virtual image 43 behind the imaging mirror group 260, and because the human eye When observing the virtual image on the reflective surface, the eyeball adjusts its focus on the reflective surface. Therefore, when viewing the virtual image on the reflective surface with human eyes, the eyes do not need to adjust the focus, but only need to focus on the reflective surface. And if there is movement in the reflected object or the image projected on the reflective surface in the display, because the eyes only focus on the reflective surface, that is, the eyeball does not need to adjust the focus greatly because of the reflected object or the image movement in the display, as long as the reflective object The image or the moving image in the display is projected on the retina after passing through the lens in the eyeball. The depth of field can be recognized by several layers of retina, that is, the eye can clearly see the image or distinguish the movement of the image, but it does not need to follow the image quickly. Adjust the length of the eyeball to adapt to the movement of the image, so the intraocular pressure will not increase.

The distance of the virtual image of the non-transparent reflective surface felt in the eyeball can be roughly illustrated in Figures 4b and 4c. Because the retina of the eyeball has a multi-layered structure, the eyeball can perceive the distance of images with a multi-layered structure. When the virtual image 44 enters the eyeball through a reflective surface 260, the eyeball automatically adjusts the relative imaging of the non-penetrating reflective surface through the crystalline lens on the retina, and the virtual 44 image formed by reflection on the reflective surface passes through the crystalline lens of the eyeball. In the case where the focal length of the lens of the eyeball is adjusted and fixed on the reflective surface, the image is formed on the multilayer structure of the retina, and the eye "feels" that the image 412 falls in front of the retina of the eye through the retina, that is, it "feels" that the image exists on the retina for reflection In the front, between the lens and the retina, as shown in Figure 4b, and then transmitted to the brain, the virtual image can be seen in front of the reflective surface, but the focal length of the eyeball has not changed. And when the real image is on the surface of the reflective surface 260, the image 413 refracted by the crystal will also fall on the surface of the retina. Combining Figures 4b and 4c, it can be explained that the object or image and its relative motion can be seen from the above description. When the virtual image moves, the eyeball does not need to adjust the focus, so there is no Doppler effect of increased intraocular pressure, overlapping images, or afterimages. This is also the advantage of virtual image projection imaging.

Next, please refer to FIG. 5 , FIG. 6 and FIG. 7 , these three figures are schematic diagrams of the refracting lens group used in the present invention compared with the prior art. Fig. 5 is a conventional direct projection using a convex lens 170. Since the optical path of the external light source 180 is in the same direction as the optical path direction of the image projected by the display unit 190, the external light source will strongly interfere with the projected image; Fig. 6 It is an existing projection system that uses concave mirror 171 to reflect imaging. In this environment, the optical path of the external light source 180 is the same as the optical path of the image projected by the display unit 190, so strong interference will also occur; FIG. Refractive imaging, in this figure, there is an angle between the convex lens (refractive imaging lens group) 172 and the display unit 190, when the light path of the external light source 180 after the refraction by the convex lens 172 and the light entering the image projected by the display unit 190 The diameters are not the same and will not interfere with each other, so it can form a good darkroom effect and improve the contrast and clarity of the image.

The second refracting mirror group of the image display device of the present invention refracts the image reflected by the second reflecting unit to form an inverted real image, and then the real image passes through the virtual image forming unit to form a virtual image. The second refracting mirror group of the image display device of the present invention preferably has the functions of concentrating light and magnifying the image at the same time, so as to respectively deflect the light rays transmitted or reflected from the second reflection unit to form a magnified real image inverted from the original image and the virtual image imaging mirror group converts the inverted magnified real image formed by the second refracting mirror group into an inverted virtual image, preferably an inverted enlarged virtual image; according to the above requirements, the image reflected by the second reflection unit and the second refracted The distance between the lens groups is preferably between the focal length of the second refracting lens group and twice the focal length thereof. The first refracting mirror group and the second refracting mirror group of the image display device of the present invention are not limited, and can be any existing refracting mirror group, preferably the first refracting mirror group or the second refracting mirror group is a condenser lens group, more preferably Preferably, the first refracting lens group or the second refracting lens group are convex lenses or two single convex lenses. The curvatures of the aforementioned two single-convex lenses may be the same or different, preferably the curvatures of the two single-convex lenses of the first refracting mirror group are different. In the image display device of the present invention, the incident light from the second reflection unit and the normal line of the incident surface of the second refracting mirror group form an included angle Y. The range is preferably greater than 0 degrees, less than 90 degrees, and more preferably between 0 degrees. and 70 degrees. The first reflective unit of the image display device of the image display device of the present invention is used to reflect or change the direction of light travel, so that the light enters the second reflective unit from the first refracting mirror group; the first reflective unit is unlimited and can be It is an existing reflective optical mirror group, preferably a triangular prism with reflective function, or a reflective film with 100% reflectivity coated on the triangular prism. The second reflective unit of the image display device of the present invention is used to reflect or change the direction of advance, so that light enters the second refracting mirror group from the first reflective mirror group; the second reflective unit is not limited and can be an existing The reflective optical mirror group is preferably a triangular prism with reflective function, or a reflective film with 100% reflectivity is coated on the triangular prism. The display unit of the image display device of the present invention can be an existing display, preferably a microplane display, more preferably an LCD, LTPS LCD, LCOS microdisplay or DMD microdisplay. The function of the virtual image imaging mirror group of the present invention is to convert an object or a real image into a virtual image, preferably a concave mirror, a concave lens or a plane mirror group; if it is a concave mirror or a concave lens, then the object or the real image is placed in its focal length and contained behind the mirror to generate a magnification An upright virtual image; if it is a plane mirror, an upright equal-height virtual image will be produced behind the mirror; therefore, the distance between the second refracting mirror group of the image display device of the present invention and the virtual image imaging mirror group is preferably the second refraction mirror. The distance between the real image formed by the mirror group and the virtual image forming mirror group is smaller than the focal length of the virtual image forming mirror group. The invention also includes a light source for providing light to the display unit. The light transmittance of the virtual image imaging unit of the present invention is not limited, as long as the external environment and the virtual image can be seen at the same time, preferably 50-70% transmittance and 30-50% reflection. The present invention may further include at least half of the solid liquid crystal layer covering one side of the virtual imaging unit to control the entry of external light; or at least one adjustable cover is also placed on one side of the virtual imaging unit. side to control the entry of external light.

The image display device of the present invention can optionally be combined with an auditory device to form an overall sound device. For example, the image display device of the present invention can be combined with a glasses-shaped outer cover and an inner cover, and assembled with an earphone to form a complete glasses-shaped audio-visual equipment. The audio-visual equipment can be connected to other existing computers or virtual reality microprocessor devices to enhance functions, for example, as a computer display device, or connected to training machines (such as simulators, astronauts' weightless training) for simulated training, or connected to The video system is used for long-distance communication, teaching, conference, monitoring, or as information display and environment display for driving vehicles, or as a display device for virtual games.

Example 1

Please refer to FIG. 8 . FIG. 8 is a cross-sectional view of the interior of the glasses-type image display device of the present invention. The present embodiment comprises a T-shaped housing, containing an LCOS microdisplay 210, two light sources 211, two non-equal curvature convex lenses 220 and 221 (the first refracting lens group), two triangular mirrors 230 and 231 (the first reflector) unit), another two triangular prisms 240 and 241 (second reflection unit), two non-equal curvature convex lenses 250 and 251 (second refraction lens group), and two concave imaging regions 260 and 261 (virtual image imaging unit) through partial mirror surface treatment ). Wherein, the same side of the microdisplay 210 is provided with two convex lenses 220 and 221, and the other side of the two convex lenses 220 and 221 is provided with two triangular prisms 230 and 231, so that the convex lens 220 is between the display 210 and the triangular prism 230; And the two sides of these two prisms 230 and 231 are provided with prisms 240 and 241 respectively, so that the microdisplay 210, the convex lens 211 and the prisms 230 and 231 are all between the prisms 240 and 241, and the display 210 and The straight line formed by the triangular prisms 230 and 231 is perpendicular to the straight line formed by the triangular prisms 230 and 231 and the triangular prisms 240 and 241 . Convex lenses 250 and 251 are respectively placed under the triangular prisms 240 and 241 , and virtual image forming regions 260 and 261 are respectively placed under the convex lenses 250 and 251 . Wherein, the convex lenses 250 and 251 are arranged so that the incident light from the triangular prisms 240 and 241 forms an included angle Y of 30 degrees with the normal line of the incident surface of the convex lenses 250 and 251 .

Please refer to FIG. 9 . FIG. 9 is a top view of the interior of the glasses-type image display device of the present invention. This figure shows that the two convex lenses 220 and 221, and the triangular prisms 230 and 231 are set at specific angles, so that the convex lenses 220 and 221 can accept the light emitted from various angles on the display 210, and just deflect it to the triangular prisms 230 and 231. 231; in order to be able to fully receive light at various angles of the display 210, the convex lenses 220 and 221 are convex lenses with non-equal curvatures, and the side facing the display 210 has a smaller curvature and can receive light at a wider angle; One side of the 231 has a larger curvature to achieve a good deflection effect, so that the light can just pass to the prisms 230 and 231 . The triangular prisms 230 and 231 must also be set at a specific angle, and their angular phases, as shown in Figure 10, must just make the light rays transmitted by the convex lenses 220 and 221 travel to the left and right directions and be completely reflected to the triangular prisms 240 and 231. 241 locations. Through this arrangement, the image provided by the display 210 is deflected to the triangular prisms 230 and 231 through the convex lenses 220 and 221 , and the triangular prisms 230 and 231 respectively reflect the image to the left and right triangular prisms 240 and 241 . Afterwards, the separated images are respectively reflected to the convex lenses 250 and 251 through the prisms 240 and 241 to form a magnified real image, which will be described in detail below.

Please refer to FIG. 10 , which is a side view of the interior of the glasses-type image display device of the present invention. This figure shows that the prism 240 will deflect and refract the image provided by the display unit to the convex lens 250, which is an image 271, and the image 271 will fall somewhere between the focal length and twice the focal length of the convex lens 250, and according to Convex mirror imaging principle, will form an upside down outside the double focal length of the other side of this convex lens 250, the magnified real image 272 of constant left and right directions (if there is a screen placed here, you can see a vertical magnified real image), the The magnification of the real image 272 depends on the distance between the image 271 and the convex lens 250, and the closer the distance, the higher the magnification. And this real image 272 must fall in the focal length of this concave mirror 260, same, according to imaging principle, can form an enlarged virtual image 273 on the other side of concave mirror 260, and the magnification of this virtual image 273 also depends on this real image 272 The distance from the concave mirror 260. It is worth noting that in this embodiment, there is no screen between the convex lens 250 and the concave mirror 260, and the magnified real image formed by the convex lens 250 cannot be seen; 260, after which the concave mirror 260 is deflected and projected into the eyes of the observer, but the light cannot be focused on the eyeball to form a real image, so the eye will extend the light to the back of the concave mirror 260 to form a magnified virtual image 273 in the same direction as the real image 272 .

Those familiar with this technical field can recognize that in order to achieve the above-mentioned imaging design, the triangular prism 240, the convex lens 250 and the concave mirror 260 must form a specific relative position, so that the image 271 can fall on the focal length and twice the focal length of the convex lens 240. between the focal lengths, and the image 272 can fall within the focal length of the concave mirror 260 .

The above-mentioned image display device can optionally be combined with a hearing device, as shown in FIG. 11 . The above-mentioned image display device 320 can be combined with a glasses-shaped outer cover 310 and an inner cover 340, and assembled with an earphone 330 to form a complete glasses-shaped audio-visual device. The audio-visual equipment can be connected to a microprocessor such as a computer or a virtual reality as a computer display device, or connected to a training machine (such as a simulator) for simulation training, or connected to a video system for remote communication, teaching, conferences, and monitoring. It can be used as information display and environment display for driving vehicles, or as a display device for virtual games.

Example 2

The structure of this embodiment is roughly the same as that described in Embodiment 1, except that the virtual image forming unit 260 is replaced by a flat mirror by a concave mirror. In this way, the formed image is only refracted and magnified by the convex lens 250 once, and then transformed into a virtual image by the plane mirror, which does not have the magnification function. However, the magnification and function of the structural image in this embodiment can still be accomplished by the convex lens 250 that refracts light.

Example 3

The structure of this embodiment is roughly the same as that described in Embodiment 1, except that the virtual image imaging unit 260 is replaced by a concave lens with a reflectivity of 40% by a concave mirror; its imaging principle and magnification are the same as those described in Embodiment 1. But after replacing it with a concave lens, the observer can see the external environment at the same time when observing the image. And because the device of the present invention forms a virtual image by refraction projection, when a concave lens is used as the virtual image imaging unit, the light rays that transmit the concave lens have a relatively large angle of refraction and deflection. The person with the glasses-type display will not see the images and data that the user is using or receiving. It has good confidentiality and privacy, and will not interfere with other people around.

Example 4

The structure of this embodiment is roughly the same as that described in Embodiment 1, except that the virtual imaging unit 260 is composed of a mirror and a concave lens; its imaging principle and magnification are the same as those described in Embodiment 1. The mirror can be switched up and down, so the observer can decide whether to only observe the image or to see the external environment at the same time according to the needs of the observer.

Example 5

The structure of this embodiment is roughly the same as that described in Embodiment 1, except that the virtual imaging unit 260 is composed of a mask and a concave lens; its imaging principle and magnification are the same as those described in Embodiment 1. The mask can be switched up and down, so the observer can decide whether to only observe the image or to see the external environment at the same time according to the needs of the observer.

Example 6

See Figure 12. The structure of this embodiment is roughly the same as that described in Embodiment 3, except that the virtual image imaging unit 260 is equipped with a half-solid liquid crystal layer mask 350 and a polarizing lens 360; its imaging principle and magnification are the same as those in Embodiment 1. stated. However, the semi-solid liquid crystal layer cover becomes transparent when the power is turned on, allowing the outside light to pass through, and the user can receive the image and monitor the surrounding environment while receiving the display image. When the user turns off the power of the liquid crystal layer cover, the cover will block the light from the outside, and receive information or images without external interference, so it can be determined whether it is in a light-transmitting or opaque state, as A raster is used. Therefore, the observer can decide whether to only observe the image or to see the external environment at the same time according to the needs of the observer.

In addition, since this embodiment uses a concave lens as the virtual image imaging unit 260, when strong light from the external environment (such as sunlight) that is higher than the user's line of sight is transmitted into the concave lens, the angle of deflection and refraction after entering the concave lens is large, and most A large amount of sunlight enters the concave lens because the refraction angle is large and will not enter the user's eyes. Therefore, this embodiment uses refraction to form a virtual image, which can reduce the interference of ambient light and relatively enhance the contrast of the image. And when viewing and receiving images or information, without affecting the comparison of images or information, the dynamics of the external environment can be observed at the same time. The image display device has a wide range of applications. For example, drivers of airplanes, boats, automobiles, locomotives and other vehicles can perform multitasking operations at the same time and take care of driving.

As can be seen from the foregoing embodiments, the imaging principle of the present invention is virtual image imaging, which mainly utilizes a refracting mirror group (convex lens) to form a magnified real image inverted from the original image; then utilizes a virtual image imaging unit (concave mirror, concave lens or plane mirror) A magnified virtual image inverted from the original image is formed. This kind of glasses-type image display device using the principle of virtual image imaging will not cause eyeball pressure, and even if it is used for a long time, it will not cause dizziness within a few hours. A big breakthrough. The present invention uses the virtual image formed on the eyeball, so when the user's head moves, the image blurring caused by the Doppler effect and the ghost image effect is reduced. In addition, since the present invention uses refracted light to form a virtual image on the user's eyeball, when enlarging the image, it is only necessary to adjust the distance, angle or even the curvature of the virtual image imaging lens group lens or the second refracting lens group (such as a convex lens), and it can be completed. The adjustment method is simple and takes up little space. Compared with the traditional projection display device that forms a real image on the user's eyeball and requires a large space, it has the relative advantages of simplified operation and large space usage flexibility. Furthermore, since the present invention uses refracted light to form a virtual image on the user's eyeball, the imaging contrast is high, the effect of the darkroom is large, and it is less disturbed by ambient light. Compared with the traditional projection display that forms a real image on the user's eyeball device with better image quality. When the user is using it, for the surrounding non-users, since the image is refraction imaging, the light refraction angle of the virtual image imaging environment group of the company is large, and it will not affect other people around the same height as the user's line of sight, and the interference is relatively small. Low. In addition, because the image display device of the present invention uses only one microdisplay, the images can be transmitted to the left and right eyes respectively. Compared with the traditional technology that needs to use two displays, the image display device of the present invention is lighter in weight and smaller in volume. Small and cost-effective. And the micro-image provided by the micro-display, by controlling the relative curvature of the virtual imaging unit (concave mirror, concave lens or plane mirror) and the refracting mirror group (convex lens), can achieve the equivalent of zooming in to tens of inches of screen in front of the user's eyes. However, the various optical elements used in it have the advantages of light weight, small size, low material cost, low power consumption, easy to carry, high flexibility in use, and can reduce production costs, which is quite in line with market demand.

To sum up, the present invention is different from the features of the prior art in terms of purpose, means and efficacy, and is a major breakthrough in the "single-body birefringent image display device". However, it should be noted that the above-mentioned embodiments are examples only for convenience of description, and the scope of rights claimed by the present invention should be determined by the scope of the patent application, rather than being limited to the above-mentioned embodiments.

Claims (21)

1. a monomer birefringence image display is characterized in that, mainly comprises:

One display unit is to provide an image;

2 first refracting set are positioned at a side of this display unit, the light that is sent in order to this display unit of deviation;

2 first reflector elements are positioned at this display unit the same side with respect to this first refracting set, in order to reflecting the light that this first refracting set is sent, and wherein this first refracting set between this first reflector group and this display unit;

2 second reflector elements, in order to the light that deviation penetrates from this first reflector element, wherein this 2 first reflector element is between this 2 second reflector element;

2 second refracting set are positioned at a side of this second reflector element, but this second refracting set is not positioned at the straight line that this second reflector element and this first reflector element form, the light that penetrates or reflect from this second reflector element in order to deviation respectively; And

Two virtual image forming mirror groups are the opposite sides that lay respectively at these 2 second refracting set, the light that is transmitted by this second refracting set with deviation, and this virtual image forming mirror group becomes the virtual image with the formed video conversion of this second refracting set;

Wherein, this second refracting set is between this second reflector element and this virtual image forming mirror group; And

The image that this display unit is shown, it is the image that stands upside down via this first refracting set refraction formation one and former image, reflex to this second refracting set via this first reflector element reflection with this second reflector element more afterwards, and penetrate this formation one of second refracting set deviation and the upright real image of former image, convert to and the upright virtual image of former image via this virtual image forming mirror group again.

2. monomer birefringence image display as claimed in claim 1, it is characterized in that, wherein this second refracting set simultaneously the function of tool optically focused and magnified image form an amplification real image that stands upside down with former image with the light that deviation respectively penetrates or reflects from this second reflector element; And this virtual image forming mirror group converts the formed inverted real image of this second refracting set to the handstand virtual image.

3. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein this first refracting set and second refracting set are a condenser group.

4. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein should form an angle Y from incident light and this second refracting set plane of incidence normal of second reflector element; And this angle Y is greater than 0 degree, less than 90 degree.

5. analyse the monomer birefringence image display of stating as claim 1, it is characterized in that, wherein each first refracting set is convex lens.

6. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein each first refracting set is two single convex lens, and the curvature difference of these two single convex lens.

7. monomer birefringence image display as claimed in claim 1 is characterized in that wherein each first reflector element is the prism of a tool reflection function.

8. monomer birefringence image display as claimed in claim 1 is characterized in that wherein this second refracting set is convex lens, in order to the light of this second reflector element of deviation, and amplifies the image that penetrates this second refracting set simultaneously.

9. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein each second refracting set is two single convex lens, and the curvature difference of these two single convex lens.

10. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein this display unit is a plane micro-display.

11. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein this display unit is LCD, LCOS micro-display or DMD micro-display.

12. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein this second reflector element is the prism for the tool reflection function.

13. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein this virtual image forming mirror group is concave mirror or concavees lens.

14. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein this virtual image forming mirror group is a level crossing.

15. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein between the real image that forms of this second refracting set and this virtual image forming mirror group distance less than the focal length of this virtual image forming mirror group.

16. monomer birefringence image display as claimed in claim 4 is characterized in that, wherein this angle Y is between 0 degree and 70 degree.

17. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein the spacing of the picture of this second reflector element reflection and this second refracting set is between the focal length and its two focus length of this second refracting set.

18. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein also comprises at least one light source, in order to this display unit light to be provided.

19. monomer birefringence image display as claimed in claim 1 is characterized in that, wherein also comprises at least one semisolid liquid crystal layer shade in a side of this virtual image forming unit, to control entering of extraneous light.

20. monomer birefringence image display as claimed in claim 1 is characterized in that, it also comprises the side of at least one adjustable shade in this virtual image forming unit, to control entering of extraneous light.

21. monomer birefringence image display as claimed in claim 1 is characterized in that, it is as glasses type display device or head-mounted display device.

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