TW201800800A - Reflective virtual image displaying device - Google Patents

Abstract

A reflective virtual image displaying device includes an image source and a partially-reflective unit. The image source projects a projection image. The partially-reflective unit includes a first surface and a second surface. The first surface receives the projection image and projects the projection image to human eyes. The human eyes can see through the first surface and see a virtual image formed at the same side of the second surface of the partially-reflective unit. An Eye-Box can be a circle or a rectangle. If the Eye-Box is a circle, a diameter thereof is greater than 60 mm. If the Eye-Box is a rectangle, a length of the Eye-Box is greater than 60 mm, and a height of the Eye-Box is greater than 6 mm. The reflective virtual image displaying device of the present disclosure can have wide application range.

Description

Reflective virtual image display device

The present invention relates to a display device; more particularly, the present invention relates to a reflective virtual image display device that can have a variety of application types.

Various display devices are already required in current daily life. Conventional display devices mostly display desired information on a fixed screen, such as a computer screen disposed on a computer, a control screen disposed on various instruments, or an embedded screen disposed on a vehicle dashboard. However, based on the increasing variety of applications, the aforementioned fixed display devices have gradually become insufficient.

An extended application form of various display devices has been developed today. For example, a Head Up Display (HUD) for a vehicle can be found on a newly released car. In addition, based on the increasing demand of modern people for obtaining instant messages, it is an inevitable trend that display devices are moving in a light and thin direction. Current small display devices such as google glass have shown this trend of miniaturization. Another head mounted display device (HMD, Head Mounted Display) is also a hot topic in recent years. Head-mounted display devices typically present image information to a display worn by the user's head. Early use was used for helmets used by pilots in order to be able to obtain a variety of messages to increase flight safety. Head-mounted display Applications for Virtual Reality (VR) or Augmented Reality (AR). In the above various display devices, most of the two-dimensional image information is presented. Recently, based on the need for immersive and interactive, Virtual Reality (VR) or Augmented Reality (AR) presents stereoscopic 3D images, and can have more advanced application types.

However, in the above-mentioned large or small display devices, in order to present the required two-dimensional or three-dimensional three-dimensional image information, the optical components are still complicated, and thus the scope of application of the stereoscopic image display device is limited.

Therefore, the development of a display device having a simple structure, being easy to integrate with current instruments and devices, and capable of presenting two-dimensional or three-dimensional three-dimensional images has become an urgent task for the improvement of the stereoscopic image display device.

The invention provides a reflective virtual image display device with a simple structure and capable of presenting two-dimensional or three-dimensional three-dimensional images. By modulating the relative position and relative distance between the image source, the partial reflection unit, various optical elements, and the virtual image, a variety of application forms can be obtained. A variety of application forms are obtained by modulating the relative position, relative distance, and optical parameter optimization between the image source, the partial reflection unit, various optical elements, and the virtual image. The present invention also discloses optimized optical parameters for better display performance.

To achieve the above object, the present invention provides a reflective virtual image display device comprising an image source and a portion of a reflection unit. The image source is used to project a projected image. The projected image may be a two-dimensional image or a three-dimensional three-dimensional image. The partial reflection unit includes a first surface and a second surface, and the first surface is used Receiving and reflecting the projected image projected by the image source to a user's eyes, the user sees through the first surface with both eyes, and sees the same message content, enlarged size and two-dimensional on the same side of the second surface as the projected image. Or a stereoscopic three-dimensional virtual image and an external background. The Eye Box of the user's eyes corresponding to the partial reflection unit is circular or rectangular, and if the Eye Box is circular, the diameter is 60 mm or more; if the Eye Box is rectangular, Then its length is greater than or equal to 60mm, and the height is greater than or equal to 6mm. The distance between the user's eyes and the virtual image is 250 mm or more. The distance between the first surface of the partial reflection unit and the user is 10 to 1500 mm. The first surface of the partial reflection unit is concave and spherical or aspherical, and its effective focal length (EFL) is greater than or equal to 10 mm and less than or equal to 1000 mm, thereby modulating the magnification of the virtual image. The second surface of the partial reflection unit is plated with an anti-reflection film.

In the above-mentioned reflective virtual image display device, a liquid crystal display panel is mounted on the same side of the second surface of the partial reflection unit for rotating the liquid crystal molecules to switch the light penetration ratio of the external background.

In the above reflective virtual image display device, the image source may be from a liquid crystal display (LCD), a digital light processing projector (DLP), a lithium-based liquid crystal projector (LCOS), an organic display (OLED), a mobile phone, and a A projected image of a satellite navigation system (GPS), a tablet, or a camera. The reflectance of the first surface of the partial reflection unit is 50% to 80%.

The reflective virtual image display device further includes at least one mirror. The mirror is used to change the projection direction of the projected image projected by the image source, thereby shortening the distance between the image source and the partial reflection unit.

In the above reflective virtual image display device, the image source is opposite in part The firing unit has an offset, and the offset is greater than or equal to 0 mm and less than or equal to 60 mm. The image source has an offset angle with respect to the partial reflection unit, and the offset angle is greater than or equal to 0 degrees and less than or equal to 30 degrees.

In another embodiment, a reflective virtual image display device of the present invention includes two image sources and a two-part reflection unit. The two image sources are used to project a projection image separately. Each of the partial reflection units includes a first surface and a second surface. Each of the first surfaces is configured to receive and reflect a projected image projected by each image source to a single eye of a user, and the user's two eyes respectively accept each part. After the reflected image reflected by the reflecting unit, the first surface is seen through, and the projected images projected by the respective projection sources are combined on the same side of each second surface, and the enlarged size is a three-dimensional one-dimensional virtual image and one External background. The diameter of the exit pupil of each of the single-eye corresponding to each of the partial reflection units is greater than or equal to 2 mm. The first surface of each partial reflection unit is concave and spherical or aspherical, and its effective focal length (EFL) is greater than or equal to 10 mm and less than or equal to 1000 mm, thereby modulating the magnification of the virtual image. The distance between any single eye of the user and the virtual image is greater than or equal to 250 mm. The distance between the first surface of each partial reflection unit and any single eye of the user is 10 to 1500 mm.

In the above-mentioned reflective virtual image display device, a liquid crystal display panel is mounted on the same side of the second surface of each of the partial reflection units for rotating the liquid crystal molecules to switch the light penetration ratio of the external background.

In the above reflective virtual image display device, the reflectance of the first surface of each partial reflection unit is 50% to 80%. An anti-reflection film may be plated on the second surface of each of the partial reflection units.

In the above reflective virtual image display device, the image source can be from a liquid Crystal display (LCD), a digital light processing projector (DLP), a lithium-based liquid crystal projector (LCOS), an organic display (OLED), a mobile phone, a satellite navigation system (GPS), a tablet computer or a camera Projected image.

The reflective virtual image display device further includes at least one mirror. The mirror is used to change the projection direction of the projected image projected by each image source, thereby shortening the distance between each image source and each partial reflection unit.

In the above-mentioned reflective virtual image display device, each image source has a vertical offset with respect to each partial reflection unit, and the vertical offset is greater than or equal to 0 mm and less than or equal to 60 mm. Each image source has an offset angle with respect to each partial reflection unit, and the offset angle is greater than or equal to 0 degrees and less than or equal to 30 degrees.

100‧‧‧Reflective virtual image display device

101‧‧‧Image source

102‧‧‧Partial reflection unit

102a‧‧‧ first surface

102b‧‧‧second surface

103‧‧‧Mirror

104‧‧‧LCD panel

S‧‧‧virtual image

B‧‧‧External background

1 is a schematic view showing a reflective virtual image display device according to a first embodiment of the present invention; FIG. 2A is a schematic diagram showing the eye box (Eye Box) in FIG. 1; FIG. 2B is a first schematic view; The eye box (Eye Box) is a rectangular schematic diagram; FIG. 3 is a schematic diagram of a reflective virtual image display device according to a second embodiment of the present invention; and FIG. 4 is a diagram showing a reflective virtual image display according to a third embodiment of the present invention; Schematic diagram of the device; 5 is a schematic view showing a reflective virtual image display device according to a fourth embodiment of the present invention; FIG. 6 is a view showing an MTF graph of the reflective virtual image display device in FIG. 5; and FIG. 7 is a fifth drawing; FIG. 8 is a schematic diagram of a reflective virtual image display device according to a fifth embodiment of the present invention; FIG. 9 is a diagram showing a reflective virtual image display in FIG. 8; The MTF graph of the device; FIG. 10 is a view showing a field curve and a curved curve of the reflective virtual image display device in FIG. 8; and FIG. 11 is a schematic view showing a reflective virtual image display device according to a sixth embodiment of the present invention; Figure 12 is a diagram showing the MTF graph of the reflective virtual image display device in Fig. 11; and Fig. 13 is a graph showing the field curve and the distortion curve of the reflective virtual image display device in Fig. 11; A schematic diagram of a reflective virtual image display device according to a seventh embodiment of the present invention; a 15th drawing showing an MTF graph of the reflective virtual image display device in FIG. 14; and a 16th drawing showing a reflective image in FIG. The field curve and the tortuous curve of the virtual image display device.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. For the sake of clarity, many practical details will be explained in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

The reflective virtual image display device of the present invention can modulate the relative position, relative distance, and optical parameter optimization configuration between the image source 101, the partial reflection unit 102, various optical elements, and the virtual image S according to actual conditions, and obtain various types. Application form. Embodiments and application examples of various reflective virtual image display devices 100 will be described in the following paragraphs, and the optimized optical parameters are also disclosed to achieve a better display effect.

Please refer to Figure 1. 1 is a schematic view showing a reflective virtual image display device 100 according to a first embodiment of the present invention. The reflective virtual image display device 100 basically includes an image source 101 and a portion of the reflection unit 102. The image source 101 is used to project a projected image. In the embodiment described below, the image source 101 is derived from a projected image projected by a mobile phone screen. In other possible embodiments, the image source 101 may also be from a liquid crystal display (LCD), a digital light processing projector (DLP), a germanium-based liquid crystal projector (LCOS), an organic display (OLED), and a satellite navigation system (GPS). Projected image of a tablet or camera. The partial reflection unit 102 includes a first surface 102a and a second surface 102b. The first surface 102a is concave and may be a spherical or aspherical surface for receiving and reflecting a projection image projected by the image source 101. Like a user's eyes. At this time, the user can see the same message content as the projected image and has a virtual image S of an enlarged size on the same side as the second surface 102b of the partial reflection unit 102. Here, the magnification of the modulated virtual image S can be obtained by modulating the effective focal length (EFL) of the first surface 102a of the partial reflection unit 102. The effective focal length is greater than or equal to 10 mm and less than or equal to 1000 mm. When the effective focal length is smaller, a virtual image S with a larger magnification can be obtained, and the user's binocular angle of view is larger at this time. In FIG. 1 , the reflectivity of the first surface 102 a of the partial reflection unit 102 is 50% to 80%, that is, the user can penetrate the partial reflection unit 102 to see the virtual image S presented in front of the eyes of the user, and At the same time, you can see the external scene B.

The projected image of the image source 101 can be a two-dimensional image or a stereoscopic three-dimensional image. When the projected image of the image source 101 is a two-dimensional image, the two-dimensional virtual image S can be seen by both eyes of the user. When the projected image of the image source 101 is a three-dimensional image, the virtual image S of the stereoscopic three-dimensional image can be seen by the user's eyes. Thereby, the effect of the naked eye 3D can be formed.

In order to meet the actual situation, a mirror 103 can be used to change the projection direction of the projected image projected by the image source 101, so that the projected image can be turned and seen by the user's eyes. In addition to changing the projection direction, the mirror 103 also has the function of adjusting the direction of the virtual image S. This is because the projected image projected by the image source 101 is reflected by the partial reflection unit 102, and the user sees the virtual image upside down by both eyes. S. After being reflected by the mirror 103, the virtual image S direction is turned positive, and the user sees the virtual image S in the same direction as the projected image projected by the image source 101. When the mirror 103 is not used, the direction of the projected image projected by the image source 101 can be adjusted in advance (for example, the direction of the screen of the mobile phone is rotated), and the virtual image S of the correct direction can be seen by both ends of the user. In addition, through the mirror The setting of 103, as the optical path passes through, can also shorten the distance between the image source 101 and the partial reflection unit 102, so as to form a more compact configuration for easy integration with other devices.

In the reflective virtual image display device 100, the image source 101 may have a vertical offset relative to the partial reflection unit 102, and its value is greater than or equal to 0 mm and less than or equal to 60 mm. Moreover, the image source 101 may also have an offset angle with respect to the partial reflection unit 102, and the value thereof is greater than or equal to 0 degrees and less than or equal to 30 degrees. Modulating the above-mentioned vertical offset and offset angle adjustable optical path difference, thereby affecting the aberration (Aberration) and modulating the MTF (Modulation Transformation Function) value. This MTF value will affect the imaging resolution and will be described in more detail in subsequent paragraphs. Another way to reduce the aberration is to use an auxiliary optical component, which is disposed between the image source 101 and the partial reflection unit 102, and can also be used to reduce the aberration of the virtual image. The auxiliary optics can be a mirror, a prism, a micro lens array, a diffuser, and a holographic optical element (HOE).

Please continue to refer to Figures 2A and 2B. Fig. 2A is a schematic view showing the eye box (Eye Box) in Fig. 1 as a circular shape. Fig. 2B is a schematic view showing the eye box (Eye Box) in Fig. 1 as a rectangle. Since the virtual image display device 100 not only presents an enlarged image, but also the imaging position is to be able to be comfortably viewed by the human eye, and does not cause distortion or distortion of the image when the human eye rotates. When the aperture of the amplifying element is too small to obtain a full field of view (FOV, Field Of View), the image will be cut off or fainted. Eye Box refers to the extent to which the eyeball can move without affecting the image quality. Only a large enough eye box can see the complete virtual image S. Because in this embodiment, it is used A single partial reflection unit 102 is matched with the user's eyes, so that the eye box corresponding to the user's eyes can be defined as a circle or a rectangle, if the eye box (Eye Box) is a circle. Shape, the diameter is greater than or equal to 60mm; if the Eye Box is rectangular, its length is greater than or equal to 60mm, and the height is greater than or equal to 6mm.

In this embodiment, the virtual image S and the external background B appearing in front of the eyes of the user are simultaneously visible. In the first figure, a liquid crystal display panel 104 is disposed on the second surface 102b side of the partial reflection unit 102. The liquid crystal display panel 104 can be planar or curved, and can change the light penetration ratio of the external background by rotating the liquid crystal molecules to switch the light penetration ratio. When the liquid crystal molecules are switched to the off state, the light of the external background is not passed, and the external background B is not visible, thereby preventing the sharpness of the virtual image S from being affected by the excessive brightness of the external background B. Of course, the ratio of the closed/on state of the liquid crystal molecule rotation switching can also be modulated, so that the external background B has different light transmittance ratios according to different usage conditions. The liquid crystal display panel 104 can be separated from the second surface 102b of the partial reflection unit 102. The distance, or directly attached to the second surface 102b of the partial reflection unit 102, can be applied depending on the actual situation. In addition, the second surface 102b of the partial reflection unit 101 can be plated with an anti-reflection film, which can reduce the generation of the image and make the virtual image S clearer.

Please continue to refer to Figure 3. 3 is a schematic view showing a reflective virtual image display device 100 according to a second embodiment of the present invention. This embodiment omits the use of the mirror 103. The projected image projected by the image source 101 is such that the first surface 102a of the partial reflection unit 102 is directly reflected to the eyes of the user. At this time, the user can see the same image content as the projected image on the same side of the second surface 102b of the partial reflection unit 102 and have a virtual image S of one or two dimensions in one of the enlarged sizes.

Please continue to refer to Figure 4. 4 is a schematic view showing a reflective virtual image display device 100 according to a third embodiment of the present invention. The mirror 103 has been described above to change the projection direction of the projected image projected by the image source 101 and the direction of the virtual image S. In FIG. 3, a plurality of mirrors 103 can be used for multiple reflection according to actual use conditions, and the optical path can be turned to shorten the distance between the image source 101 and the partial reflection unit 102, so as to reduce the volume of the reflective virtual image display device 100.

The projected image projected by the projection source 101 can be enlarged by the partial reflection unit 101 to form an enlarged virtual image S visible to the user's eyes. This embodiment can be applied to, for example, a screen of a desktop computer, an embedded screen, a television screen, or a movie screen. Since it is presented as a dangling virtual image S, and the size can be arbitrarily adjusted, it can replace the current use of a fixed screen, and has application flexibility.

The reflective virtual image display device 100 of the above-described first to fourth figures can be highly integrated into a head-mounted display device (HMD), a head-up display (HUD), or the like as a main optical element because of its simple structure. For example, it can be installed in a helmet or installed in a car dashboard as a source of display image information. In addition, the reflective virtual image display device 100 of the first to third embodiments can provide a stereoscopic three-dimensional image by changing the number of the image source 101 and the partial reflection unit 102 in addition to the two-dimensional image (for example, to form a virtual Reality or augmented reality). Moreover, the relative position, relative distance, and optical parameter optimization configuration between the image source 101, the partial reflection unit 102, the mirror 103, and the virtual image S are more tunable so that they can be applied to the near-end display device (HUD, HMD). Or remote display device (projection screen), etc. For example, the effective focal length EFL of the first surface 102a of the partial reflection unit 102 may be greater than or equal to 10 mm and less than or equal to 1000 mm; the distance between the user's eyes and the virtual image S is 250 mm to infinity; The distance between the first surface 102a of the partial reflection unit 102 and the eyes of the user is 10 to 1500 mm.

Please continue to refer to Figure 5 to Figure 7. 5 is a schematic view showing a reflective virtual image display device 100 according to a fourth embodiment of the present invention; FIG. 6 is a view showing an MTF graph of the reflective virtual image display device 100 in FIG. 5; 5 is a field curve and a tortuous curve diagram of the reflective virtual image display device 100.

FIG. 5 illustrates an application of the reflective virtual image display apparatus 100 of the present invention for forming a stereoscopic three-dimensional image. This embodiment differs from the foregoing in that a single image source is used, and a single partial reflection unit 102 is simultaneously imaged to the user's eyes to form a two-dimensional or three-dimensional three-dimensional image. In this embodiment, the reflective virtual image display device 100 includes two image sources 101 and a two-part reflection unit 102. The two image sources 101 are used to project a projection image separately. The two-part reflective unit 102 each includes a first surface 102a and a second surface 102b. Each of the first surfaces 102a is configured to receive and reflect a projected image projected by each image source 101 to a single eye of the user. After the two eyes of the user respectively receive the projection images reflected by the first surfaces 102a of the partial reflection units 102, the projected image information projected by the projection sources 101 is combined on the same side of each of the second surfaces 102b. , with a magnified size and a stereoscopic three-dimensional virtual image S. This virtual image S can be presented in a virtual reality or an augmented reality. In this embodiment, the diameter of the exit pupil of the user's single eye corresponding to each of the partial reflection units is greater than 2 mm. In this embodiment, the distance between the first surface 102a of the partial reflection unit 102 and the single eye of the user is 100 mm, and the distance between the user's single eye and the virtual image S is 550 mm. The optical image display device 100 configured in this manner has optical characteristics as shown in the MTF graph of FIG. 6 and the field curve and the warp graph of FIG. From Figure 6 and Figure 7 In the figure, it can be seen that the MTF value of the human eye recognition ability of the reflective virtual image display device is at least 3.2 lp/mm@24% under the virtual image distance of 550 mm, the distortion can be less than +2%, and the general optical distortion specification is plus or minus 3%. Within. Therefore, under the optimal optical parameter configuration, the MTF value and distortion can be obtained better than the general specifications, so that the imaging resolution is good, and the image is not deformed to obtain a clear image.

Please continue to refer to Figure 8 to Figure 10. 8 is a schematic view showing a reflective virtual image display device 100 according to a fifth embodiment of the present invention; FIG. 9 is a MTF graph showing the reflective virtual image display device 100 in FIG. 8; 8 is a field curve and a tortuous curve diagram of the reflective virtual image display device 100. Unlike in the previous embodiment, this embodiment uses a single image source 101 and a single portion of the reflective unit 102 to image both eyes of the user. In order to be able to see the complete virtual image S, the eye box of the user's eyes corresponding to the partial reflection unit is circular, and its diameter is larger than 60 mm. In this embodiment, since the diameter of the human eye is about 2 to 8 mm, when the MTF value is calculated, the diameter of the eye box is 6 mm. In this embodiment, the distance between the first surface 102a of the partial reflection unit 102 and the eyes of the user is 100 mm, and the distance between the eyes of the user and the virtual image S is 555 mm. The optical image display device 100 configured in this manner has optical characteristics as shown in the MTF graph of FIG. 9 and the field curve and the warp graph of FIG. From Fig. 9 and Fig. 10, it can be seen that the MTF value of the human eye recognition capability of the reflective virtual image display device at a distance of 555 mm between the user's eyes and the virtual image is at least 3.2 lp/mm@8%, and the distortion can be less than +2%, generally when the distance between the user's eyes and the virtual image is 500mm, the MTF value of the human eye recognition ability should be at least 3.2 lp/mm, and the optical distortion specification is within plus or minus 3%. Therefore, this is true Under the optimized optical parameter configuration, the MTF value and distortion can be obtained better than the general specifications, so the image resolution is good, and the image is not deformed to obtain a clear image.

Please continue to refer to Figure 11 to Figure 13. 11 is a schematic view showing a reflective virtual image display device 100 according to a sixth embodiment of the present invention; FIG. 12 is a MTF graph showing the reflective virtual image display device 100 in FIG. 11; 11 is a field curve and a tortuous curve diagram of the reflective virtual image display device 100. This embodiment images a single image source 101 and a single portion of the reflective unit 102 to the user's eyes. In order to be able to view the complete virtual image S, the user's binocular corresponding partial reflection unit defines an eye box (Eye Box) which is circular and has a diameter greater than 60 mm. In this embodiment, since the diameter of the human eye is about 2 to 8 mm, when the MTF value is evaluated, the first surface 102a of the partial reflection unit 102 is used in the embodiment in which the diameter of the eye box is 6 mm. The distance between the eyes is 450 mm, and the distance between the user's eyes and the virtual image S is 2090 mm. Thereby, it can be used as a hanging head-up display. The optical image display device 100 configured in this manner has optical characteristics as shown in the MTF graph of Fig. 12 and the field curve and the warp graph of Fig. 13. From Fig. 12 and Fig. 13, it can be seen that the MTF value of the human eye recognition capability of the reflective virtual image display device at a distance of 450 mm between the user's eyes and the virtual image is at least 0.86 lp/mm@66%, and the distortion can be less than +2%, the general optical distortion specification is within plus or minus 3%. Therefore, under the optimal optical parameter configuration, the MTF value and distortion can be obtained better than the general specifications, so that the imaging resolution is good, and the image is not deformed to obtain a clear image.

Please continue to refer to Figures 14 through 16. Figure 14 is a diagram showing the invention FIG. 15 is a view showing an MTF graph of the reflective virtual image display apparatus 100 in FIG. 14 and a 16th drawing showing a reflective virtual image display apparatus in FIG. 100 field curve and distortion curve. This embodiment images a single image source 101 and a single portion of the reflective unit 102 to the user's eyes. In order to be able to view the complete virtual image S, the user's binocular corresponding partial reflection unit defines an eye box (Eye Box) which is circular and has a diameter greater than 60 mm. In this embodiment, since the diameter of the human eye is about 2 to 8 mm, when the MTF value is evaluated, the first surface 102a of the partial reflection unit 102 is used in the embodiment in which the diameter of the eye box is 6 mm. The distance between the eyes is 1300 mm, and the distance between the user's eyes and the virtual image S is 2090 mm. Thereby, a mirror can be disposed between the first surface 102a of the partial reflection unit 102 and the eyes of the user to make the optical path turn, and a reflective virtual image display that can be disposed in the automobile and sees the virtual image S in two or three dimensions is formed. The device 100 can be used as a heads up display. In this embodiment, the reflective virtual image display device 100 is embedded under the instrument panel, and the projected image of the image source 101 is reflected by the partial reflection unit 102 to a windshield. At this time, a reflective film is attached to the surface of the windshield, so that the user can see the virtual image S in front of the windshield by both eyes. The optical image display device 100 configured in this manner has optical characteristics as shown in the MTF graph of Fig. 15 and the field curve and the warp graph of Fig. 16. From Fig. 15 and Fig. 16, it can be seen that the MTF value of the human eye recognition capability of the reflective virtual image display device is at least 0.86 lp/mm@71% under the distance between the user's eyes and the virtual image of 2090 mm, and the distortion can be less than -2%. Generally, when the distance between the user's eyes and the virtual image is 2000 mm, the MTF value of the human eye recognition ability needs to be at least 0.86 lp/mm, and the optical distortion specification is within plus or minus 3%. Therefore, under the optimized optical parameter configuration implemented by this, it is available The MTF value and distortion are better than the general specifications, so the resolution of the image is good, and the image is not deformed to obtain a clear image.

In summary, the reflective virtual image display device 100 of the present invention has a simple structure and can be easily integrated with other devices according to actual use conditions. Moreover, through the optimization of the optical parameters, it is possible to form a virtual image S which is excellent in image resolution and does not distort the deformation. The reflective virtual image display device 100 of the present invention can be used to form a virtual image S in two or three dimensions, which has wide applicability.

While the invention has been described above by way of example, the invention is not intended to be limited thereby, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧Reflective virtual image display device

101‧‧‧Image source

102‧‧‧Partial reflection unit

102a‧‧‧ first surface

102b‧‧‧second surface

103‧‧‧Mirror

104‧‧‧LCD panel

S‧‧‧virtual image

B‧‧‧External background

Claims (16)

A reflective virtual image display device comprising: an image source for projecting a projection image, wherein the projection image is a two-dimensional image or a stereoscopic three-dimensional image; and a portion of the reflection unit, the partial reflection unit comprising a first surface And a second surface, the first surface is configured to receive and reflect the projected image projected by the image source to a user's eyes, the user's eyes see through the first surface, and the same side of the second surface Seeing the same message content as the projection image, magnifying the size and forming a virtual image of two-dimensional or three-dimensional three-dimensional and an external background; wherein the user's eyes corresponding to the partial reflection unit define an eye box (Eye Box) as a circle Or a rectangle, if the eye box (Eye Box) is circular, the diameter is greater than or equal to 60 mm; if the eye box (Eye Box) is rectangular, the length is greater than or equal to 60 mm, and the height is greater than or equal to 6 mm; wherein the partial reflection unit The first surface is concave and spherical or aspherical, and the effective focal length (EFL) is greater than or equal to 10 mm and less than or equal to 1000 mm, thereby modulating the magnification of the virtual image; wherein the use Away from the eyes and the virtual image of not less than 250mm; wherein the portion of the first surface of the reflection unit with the distance from the eyes of the user is 10 ~ 1500mm. The reflective virtual image display device of claim 1, wherein a liquid crystal display panel is mounted on the same side of the second surface of the partial reflection unit for rotating the external background light through the liquid crystal molecules. Penetration ratio. The reflective virtual image display device of claim 1, wherein the second surface of the partial reflection unit is plated with an anti-reflection film. The reflective virtual image display device according to claim 1, wherein the image source is from a liquid crystal display panel (LCD), a digital light processing projector (DLP), a germanium-based liquid crystal projector (LCOS), and a A projected image of an organic display (OLED), a mobile phone, a satellite navigation system (GPS), a tablet computer, or a camera. The reflective virtual image display device of claim 1, wherein the first surface of the partial reflection unit has a reflectance of 50% to 80%. The reflective virtual image display device of claim 1, further comprising at least one mirror for changing a projection direction of the projected image projected by the image source, thereby shortening the image source and the image source The distance of the partial reflection unit. The reflective virtual image display device of claim 1, wherein the image source has a vertical offset from the partially reflective unit, the vertical offset being greater than or equal to 0 mm and less than or equal to 60 mm. Reflective virtual image display as described in claim 1 The display device, wherein the image source has an offset angle with respect to the partial reflection unit, the offset angle being greater than or equal to 0 degrees and less than or equal to 30 degrees. A reflective virtual image display device comprising: two image sources for respectively projecting a projection image; and a two-part reflection unit, each of the partial reflection units comprising a first surface and a second surface, each of the first surfaces For receiving and reflecting the projected image projected by each of the image sources to a single eye of a user, the two single eyes of the user respectively receive the projected image reflected by each of the partial reflection units, and then see through the first surface. And forming, on the same side of each of the second surfaces, the projected image projected by each of the projection sources, having an enlarged size and a stereoscopic three-dimensional virtual image and an external background; wherein the user has any one of the single eyes Corresponding to each of the partial reflection units, the diameter of the exit pupil is greater than or equal to 2 mm; wherein the first surface of each of the partial reflection units is concave and spherical or aspherical, and the effective focal length (EFL) is greater than or equal to 10 mm and less than or equal to 1000 mm. Modulating the magnification of the virtual image; wherein the distance between the single eye of the user and the virtual image is greater than or equal to 250 mm; wherein the first surface of each of the partial reflection units is From a wearer to any of the monocular is 10 ~ 1500mm. The reflective virtual image display device of claim 9, wherein a liquid crystal display panel is mounted on the same side of the second surface of each of the partial reflection units for rotating the external back through the liquid crystal molecules. The light penetration ratio of the scene. The reflective virtual image display device of claim 9, wherein the second surface of each of the partial reflection units is plated with an anti-reflection film. The reflective virtual image display device of claim 9, wherein the image source is from a liquid crystal display (LCD), a digital light processing projector (DLP), a germanium-based liquid crystal projector (LCOS), an organic Projection image of a display (OLED), a mobile phone, a satellite navigation system (GPS), a tablet computer or a camera. The reflective virtual image display device according to claim 9, wherein the first surface of each of the partial reflection units has a reflectance of 50% to 80%. The reflective virtual image display device of claim 9, further comprising at least one mirror for changing a projection direction of the projected image projected by each image source, thereby shortening each of the image sources The distance from each of the partial reflection units. The reflective virtual image display device of claim 9, wherein each of the image sources has a vertical offset with respect to each of the partial reflection units, the vertical offset being greater than or equal to 0 mm and less than or equal to 60 mm. The reflective virtual image display device of claim 9, wherein each of the image sources has an offset angle with respect to each of the partial reflection units, the offset angle being greater than or equal to 0 degrees and less than or equal to 30 degrees.