CN102879995A - Display device - Google Patents

Abstract

The invention discloses a display deviceThe device comprises an image generator, a projection lens group, a depth detection module for detecting the position of a user and a control unit electrically connected with the image generator, the projection lens group and the depth detection module. The image displayed by the image generator is projected by the projection lens set to generate a floating real image between the projection lens set and the user. Each light beam constituting the floating real image has a light cone angle θ. Each light beam comprises a chief ray and a plurality of marginal rays, an included angle alpha is formed between each marginal ray and the corresponding chief ray, and the light cone angle theta is 2 alpha. The image generator and the projection lens set adjust the position of the floating real image according to the position of the user, the size of the floating real image is L, the distance between two eyes of the user is W, the distance between the user and the floating real image is D, and the light cone angle theta satisfies the relation:

Description

display screen

technical field

The present invention relates to a display device, and in particular to a display device with a floating real image.

Background technique

In recent years, with the continuous advancement of display technology, users have higher and higher requirements on the display quality (such as image resolution, color saturation, etc.) of the display. However, in addition to high image resolution and high color saturation, in order to meet the needs of users to watch real images, displays capable of displaying stereoscopic images have also been developed.

The general stereoscopic display is limited by the software and hardware of the flat panel display or the projection technology itself, so that the user needs to wear special stereoscopic glasses when viewing stereoscopic images. Even the naked-eye display technology still has a serious problem of crosstalk, causing viewers to experience physical discomfort due to watching the disturbed stereoscopic images. Therefore, the industry looks forward to a stereoscopic display that can provide users with a more comfortable viewing experience.

In addition, most of the current touch control interfaces use fingers to touch the touch panel to obtain corresponding information or feedback actions. However, such an operation mode is likely to cause the touch interface to be contaminated with bacteria due to long-term touch. In order to prevent bacteria from contaminating users, the industry expects an image of a virtual touch interface that can float in space to interact with users. Therefore, how to free the stereoscopic image from being limited by the distance between the user and the stereoscopic display is an urgent problem to be solved in the industry.

Contents of the invention

The invention provides a display device capable of generating a floating real image and adjusting the position and size of the floating real image according to the user's position.

The present invention provides a display device, which is suitable for users to watch. The display device includes at least one image generator, a projection lens group, a depth detection module and a control unit. The image generator is adapted to display at least one image. The projection lens group is located between the image generator and the user, and the image is projected through the projection lens group to generate a floating real image between the projection lens group and the user, wherein each light beam forming the floating real image has a light cone angle θ, wherein Each light beam includes a chief ray and a plurality of marginal rays, each marginal ray has an included angle α with the corresponding chief ray, and the light cone angle θ=2α. The control unit is electrically connected with the image generator, the projection lens group and the depth detection module. The depth detection module detects the position of the user, and the image generator and the projection lens group adjust the position of the floating real image according to the position of the user. The size of the floating real image is L, and the distance between the user's eyes is W. The distance between the object and the floating real image is D, and the light cone angle θ satisfies the following relationship:

$\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; \&Greater\; Equal;</span>{\mathrm{<span\; class="notranslate">\; the\; tan</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; W</span>}}{\mathrm{<span\; class="notranslate">\; D.</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; .</span>$

Based on the foregoing, the display device of the present invention can generate a floating real image between the projection lens set and the user by making the light beams emitted from the projection lens set meet a specific relationship. Moreover, the position of the user is detected by the depth detection module, and the image generator and the projection lens group can be controlled according to the user's In some embodiments, the floating real image is a stereoscopic image, or the three-dimensional floating real image can also be viewed through stereoscopic glasses. Therefore, the display device of the present invention can provide users with more lifelike interaction and experience.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a display device in an embodiment of the present invention.

FIG. 2 is a schematic diagram of a projection lens group in a display device according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a projection lens group in a display device according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a projection lens group in a display device according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a projection lens group in a display device according to an embodiment of the present invention.

FIGS. 6A to 6C are schematic diagrams of optical paths of a floating real image generated after an image is projected through a projection lens group in a display device according to an embodiment of the present invention.

7A and 7B are schematic diagrams for adjusting the relative positions of the image generator and the projection lens group in an embodiment of the present invention.

FIG. 7C is a schematic diagram showing that the display device can adjust the position of the floating real image according to the user's position in an embodiment of the present invention.

FIGS. 8A and 8B respectively show schematic diagrams when a user wears 3D glasses to view a display device having the projection lens set in FIG. 2 .

FIG. 9A and FIG. 9B respectively show schematic diagrams when a user wears 3D glasses to view a display device having the projection lens set in FIG. 4 .

FIG. 10A and FIG. 10B are schematic diagrams of a display device using a naked-eye 3D stereoscopic display panel instead of a general 2D flat display panel in the display device of the present invention.

FIG. 11 is a schematic structural diagram of a display device in an embodiment of the present invention.

[Description of main component symbols]

10: user;

200, 300, 400, 500, 600: display device;

210: image generator;

210': Glasses-free 3D stereoscopic display panel;

210A: a first image generator;

210B: a second image generator;

210C: a third image generator;

212: image;

212A: first image;

212B: second image;

212L: left eye image;

212R: right eye image;

220: projection lens group;

220R: reflector;

222: light-combining element;

222A: the first light-combining element;

222B: the second light-combining element;

224: lens group;

224A: the first lens group;

224B: the second lens group;

224C: the third lens group;

224D: the fourth lens group;

240: depth detection module;

250: control unit;

260: floating real image;

260': Stereoscopic 3D floating real image;

262: light beam;

260a: sub-floating real image;

260aA: the first sub-floating real image;

260aB: the second sub-floating real image;

262C: chief light;

262M: edge light;

270: actuator;

280: Stereo glasses;

282: shutter glasses;

284: Polarized glasses;

284L, 284R: Polarized lenses;

f1, f2: focal length;

D1: object distance;

D2: image distance;

M1, M2: moving direction;

M3: direction of rotation;

D: the distance between the user and the floating real image;

L: the maximum size of the floating real image;

p: vertical polarization direction;

P1, P2: position;

s: horizontal polarization direction;

W: the distance between the user's eyes;

θ: light cone angle;

α: The angle between the edge ray and the corresponding chief ray.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a display device in an embodiment of the present invention. Referring to FIG. 1 , the display device 200 is suitable for viewing by a user 10 . The display device 200 includes at least one image generator 210 , a projection lens set 220 , a depth detection module 240 and a control unit 250 . The image generator 210 is adapted to display at least one image 212, for example, the first image generator 210A displays an image 212A, and the second image generator 210B displays an image 212B. The image generator 210 is, for example, a display panel, a light emitting element, or an object illuminated by light. The projection lens set 220 is located between the image generator 210 and the user 10 , and the image 212 is projected through the projection lens set 220 to generate a floating real image 260 between the projection lens set 220 and the user 10 .

In addition, the control unit 250 is electrically connected with the image generator 210 , the projection lens set 220 and the depth detection module 240 . The depth detection module 240 is used to detect the position of the user 10 , and the image generator 210 and the projection lens set 220 can adjust the position of the floating real image 260 according to the position of the user 10 . Specifically, each light beam 262 constituting the floating real image 260 has a light cone angle θ, wherein each light beam 262 includes a chief ray 262C (chief ray) and a plurality of marginal rays 262M (marginal ray), each marginal ray 262M corresponds to There is an included angle α between the principal rays 262C of , and the light cone angle θ=2α. In particular, when the size of the floating real image 260 is L, the distance between the eyes of the user 10 is W, and the distance between the user 10 and the floating real image 260 is D, the light cone angle θ satisfies the following relationship:

$\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; \&Greater\; Equal;</span>{\mathrm{<span\; class="notranslate">\; the\; tan</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; W</span>}}{\mathrm{<span\; class="notranslate">\; D.</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; .</span>$

Since each light beam 262 constituting the floating real image 260 in the present invention has a light cone angle θ satisfying the above relation, the image 212 displayed by the image generator 210 can allow the user 10 to observe a floating real image after passing through the projection lens group 220 260. For example, when the image generator 210 is an apple irradiated by light, by adjusting the light cone angle θ of the light beam 262 projected after passing through the projection lens group 220, the relational expression is satisfied:

$\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; \&Greater\; Equal;</span>{\mathrm{<span\; class="notranslate">\; the\; tan</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; W</span>}}{\mathrm{<span\; class="notranslate">\; D.</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; .</span>$

The user 10 can watch a floating real image 260 of an apple between the projection lens set 220 and the user 10 . It is worth mentioning that when the light beam 262 projected from the projection lens group 220 satisfies the above relational expression, the viewing angle of the floating real image 260 viewed by the user 10 is no longer limited to a specific small range, but can be larger. The floating real image 260 is seen from the angle of view. The so-called large viewing angle here means that even if the user 10 moves about 11 centimeters, he can still see the complete undistorted floating real image 260 . In other words, the display device 200 of this embodiment can provide a floating image of the user 10 with a viewing angle greater than 34 degrees (plus or minus 17 degrees).

In addition, as shown in FIG. 1 , the projection lens group 220 of this embodiment includes a light-combining element (elements with functions of penetration and reflection, such as half mirror, beam splitter and other elements) 222, a first lens group 224A, a second The lens group 224B and the third lens group 224C, the first image 212A displayed by the first image generator 210A passes through the projection lens group 220 to generate the first sub-floating real image 260aA, and the second image 212B displayed by the second image generator 210B The second sub-floating real image 260aB is generated after passing through the projection lens group 220. In this embodiment, the first sub-floating real image 260aA and the second sub-floating real image 260aB are located on different planes, which can directly produce a stereoscopic image effect. Other implementations of the projection lens group 220 and other implementations of stereoscopic image effects will be described later.

It is worth mentioning that, through the control unit 250 and the depth detection module 240 in the display device 200 of the present invention, the user 10 can be provided with a more humanized operation and a more immersive interaction mode. Specifically, the control unit 250 controls the movement of the image generator 210 according to the location information of the user 10 detected by the depth detection module 240, so as to adjust the relative position of the image generator 210 and the projection mirror group 220, and to adjust the floating real image. 260 and the size of the floating real image 260 .

The depth detection module 240 is mainly used to detect the position of the user 10, which may be to detect the position of the user 10's body or the position where the finger of the user 10 touches the floating real image 260. The implementation of the depth detection module 240 You can refer to the United States patent application Co-pending USPA61475648 Apparatus and Method for Depth Image Capturing, and the relevant mechanisms will be explained later. To put it simply, the depth detection module 240 feeds back the detected position information of the user 10 to the control unit 250, and the control unit 250 can calculate the position corresponding to the user and the floating real image 260 after performing simple calculations. position and the size of the floating real image 260 required, and correspondingly move the image generator 210 or/and the projection mirror assembly 220 by a corresponding distance to achieve the desired image change effect.

The following description will focus on the implementation of the projection lens group in the display device of the present invention, and other components will be omitted.

2 and 3 are schematic diagrams of a projection lens group and an image generator in a display device according to an embodiment of the present invention, respectively. In FIG. 2 and FIG. 3 , the number of the image generator 210 is one, which belongs to the design type of single optical path. Please refer to Fig. 2 first, the projection lens group 220 of the present embodiment comprises two lens groups 224, and the two lens groups 224 are positioned on the projection path of image 212, wherein each lens group is made up of at least one lens, and its lens can be aspheric mirror, spherical mirror or It is a Fresnel lens, and the total focal length of each lens group is a positive value. In other words, please refer to FIG. 1 and FIG. 2 at the same time. The control unit 250 of this embodiment controls the position of the user 10 detected by the depth detection module 240 to control the two lenses in the projection lens group 220 relative to the image. The relative position of the generator 210 is used to adjust the position of the floating real image 260 and the size of the floating real image 260 .

On the other hand, please refer to FIG. 1 and FIG. 3 at the same time. The projection lens group 220 of this embodiment includes a reflector 220R, a first lens group 224A, and a second lens group 224B, wherein the reflector 220R is, for example, a total reflection mirror. . Reflector 220R is located in the projection path of image 212 . The first lens group 224A is located on the projection path of the image 212 and located between the image generator 210 and the reflector 220R. The second lens group 224B is located on the projection path of the image 212 and located between the reflector 220R and the user 10 . In other words, in this embodiment, the control unit 250 controls the distance between the first lens group 224A, the second lens group 224B, or the reflector 220R according to the location information of the user 10 detected by the depth detection module 240 . The relative position of the projection lens group 220 relative to the image generator 210 is adjusted, so as to control the position of the floating real image 260 and the size of the floating real image 260 . The manner of adjusting the position and the relationship between the imaging position and the size will be described later.

FIG. 4 is a schematic diagram of a projection lens group in a display device according to an embodiment of the present invention. In FIG. 4 , the number of image generators 210 is two, which belongs to the design type of dual optical paths. 1 and 4, in this embodiment, the image generator 210 includes a first image generator 210A and a second image generator 210B, the first image generator 210A displays a first image 212A, and the second image The generator 210B displays the second image 212B, and the projection lens group 220 includes a light combining element 222, a first lens group 224A, a second lens group 224B, and a third lens group 224C, wherein the light combining element 222 can be a half mirror (half mirror) Mirror), it can also be a dichroic mirror for reflection and transmission of different wavelengths. The light combining element 222 is located on the projection path of the first image 212A and the second image 212B, and the light combining element 222 reflects the first image 212A and allows the second image 212B to pass through. The first lens group 224A is located on the projection path of the first image 212A, and is located between the first image generator 210A and the light combining element 222 . The second lens group 224B is located on the projection path of the second image 212B, and is located between the second image generator 210B and the light combining element 222 . The third lens group 224C is located on the projection path of the first image 212A and the second image 212B, and is located between the light combining element 222 and the user 10 . In other words, please refer to FIG. 1 and FIG. 4 , the control unit 250 adjusts the first lens group 224A, the second lens group 224B, the third lens group 224A according to the location information of the user 10 detected by the depth detection module 240 . The relative position of the lens group 224C or the light combining element 222 or the relative position of the projection lens group 220 relative to each image generator 210 is adjusted to control the position and size of the floating real image 260 . The manner of adjusting the position and the relationship between the imaging position and the size will be described later.

FIG. 5 is a schematic diagram of a projection lens assembly in a display device according to an embodiment of the present invention. In FIG. 5 , the number of image generators 210 is three, which belongs to the design type of three light paths. As shown in FIG. 5 , in this embodiment, the image generator 210 includes a first image generator 210A, a second image generator 210B and a third image generator 210C, the first image generator 210A displays a first image 212A, The second image generator 210B displays a second image 212B, and the third image generator 210C displays a third image 212C, and the projection lens group 220 includes a first light combining element 222A, a second light combining element 222B, and a first lens group 224A , the second lens group 224B, the third lens group 224C and the fourth lens group 224D. The first light combining element 222A is located on the projection path of the first image 212A, the second image 212B and the third image 212C, the first light combining element 222A reflects the first image 212A and the third image 212C and allows the second image 212B to pass through. The second light combining element 222B is located on the projection path of the first image 212A and the third image 212C, and the second light combining element 222B reflects the third image 212C and allows the first image 212A to pass through. The first lens group 224A is located on the projection path of the first image 212A and the third image 212C, and is located between the second light combining element 222B and the first light combining element 222A. The second lens group 224B is located on the projection path of the second image 212B, and is located between the second image generator 210B and the first light combining element 222A. The third lens group 224C is located on the projection path of the first image 212A, the second image 212B and the third image 212C, and is located between the first light combining element 222A and the user 10 . The fourth lens group 224D is located on the projection path of the third image 212C, and is located between the third image generator 210C and the second light combining element 222B. In other words, please refer to FIG. 1 and FIG. 5 at the same time. The control unit 250 of this embodiment controls the first lens group 224A and the second lens group 224A according to the location information of the user 10 detected by the depth detection module 240. 224B, the third lens group 224C, the fourth lens group 224D, the first light-combining element 222A or the second light-combining element 222B or the relative position of the projection lens group 220 relative to each image generator 210 , so as to adjust the position of the floating real image 260 and the size of the floating real image 260 .

The relationship between the relative position of the image generator and the projection lens group to the position of the floating real image and the size of the floating real image will be described below with reference to FIGS. 6A to 6C .

6A to 6C are schematic diagrams of the optical path of a floating real image after the image is projected through the projection lens group in a display device according to an embodiment of the present invention, and the display device is, for example, a display device with the projection lens group in FIG. In other words, in this embodiment, there are three light paths, and the lens groups in the projection lens group 220 can share the two light paths. The following takes one of the optical paths as an example for description. Let the focal length of the lens group closer to the image generator 210 in the projection lens group 220 be f1, and the focal length of the lens group closer to the floating real image 260 in the projection lens group 220 is f2, wherein f1 and f2 are, for example, 26.2 cm and 30.3 cm respectively. centimeter. When the relative positions of the components in the projection lens set 220 are fixed, the imaging position and magnification of the floating real image 260 can be controlled by adjusting the object distance D1 between the image generator 210 and the projection lens set 220 .

Specifically, the object distance D1 between the image generator 210 and the projection lens group 220 in FIG. 6A is shorter than the object distance D1 in FIG. 6B, for example, the object distance D1 in FIG. 6A is smaller than the focal length f1 of the lens, while in FIG. The object distance D1 is equal to the focal length f1 of the lens, thereby making the image distance D2 between the floating real image 260 generated in FIG. 6A and the projection lens group 220 longer than the image distance D2 in FIG. The magnification of real image 260 relative to image 212 is greater than the magnification of floating real image 260 relative to image 212 generated in FIG. 6B . On the other hand, the object distance D1 between the image generator 210 and the projection mirror group 220 in FIG. 6C is longer than the object distance D1 in FIG. The image distance D2 is shorter than the image distance D2 in FIG. 6B , and the magnification of the floating real image 260 generated in FIG. 6C relative to the image 212 is smaller than the magnification of the floating real image 260 generated in FIG. 6B relative to the image 212.

For example, the object distance D1 in FIG. 6B is 27.4 cm, the image distance D2 is 20 cm, and the magnification is 1. In other words, the size of the floating real image 260 in FIG. 6B is equal to the size of the image 212 . In FIG. 6A , the object distance D1 is 17 cm, the image distance D2 is 34.2 cm, and the magnification is 1.36, that is, the size of the floating real image 260 in FIG. 6A is larger than the size of the image 212 . In FIG. 6C , the object distance D1 is 60 cm, the image distance D2 is 2.17 cm, and the magnification is 0.54, that is, the size of the floating real image 260 in FIG. 6C is smaller than the size of the image 212 . Therefore, through the above-mentioned object-image relationship, the image 212 displayed by the image generator 210 can be imaged at any position between the user 10 and the projection lens group 220 by matching various types of optical paths (to be described later). Moreover, the size of the floating real image 260 can also be changed according to requirements.

Table 1 and Table 2 are the optical design parameters of the projection lens group in the display device of the present invention. According to the embodiments shown in Table 1 and Table 2, the floating real image 260 can be imaged 20 cm in front of the projection lens group 220 , and the user 10 is positioned 50 cm in front of the floating real image 260 . This is designed to be viewed from a larger viewing angle, even if the user 10 moves about 11 centimeters, he can still see the complete undistorted floating real image 260 . In other words, the display device 200 of this embodiment can provide a floating image of the user 10 with a viewing angle greater than 34 degrees.

Table 1

Table 2 shows the design parameters of the aspheric mirror in Table 1, wherein the parameters of the aspheric constants are as follows, and the corresponding parameters are shown in Table 2:

$\mathrm{<span\; class="notranslate">\; Z</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; CURV</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; CURV</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; B</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; 8</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="10"\; label="Y"\; filenames="HDA0000146040770000011.png,HDA0000146040770000061.png"\; state="\{\{state\}\}">Y</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 10</span>}}<span\; class="notranslate">\; .</span>$

Table 2

The manner of adjusting the relative positions of the image generator and the projection lens group will be described below with reference to FIGS. 7A and 7B .

7A and 7B are schematic diagrams for adjusting the relative positions of the image generator and the projection lens group in an embodiment of the present invention. A schematic diagram of the relationship between adjusting the final imaging position of the floating real image 260 by changing the object distance D1 between the image generator 210 and the projection lens group 220 . Please refer to FIG. 7A first. In some applications, the image generator 210 can be moved by the actuator 270, so that the image generator 210 can move on one axis relative to the projection mirror group 220 to adjust the image generator 210 and the projection mirror group 220. to change the imaging scale or imaging position of the floating real image 260. Here, the single-axis movement can include the M1 movement direction, the M2 movement direction or the M3 rotation method as shown in the figure, and the present invention is not limited thereto. As shown in FIG. 7A , when the position of the image generator 210 moves from the position P1 to the position P2 , the corresponding imaging position of the floating real image 260 also moves from the position P1 to the position P2 . At the same time, the size of the image will become smaller, that is, the floating real image 260 will shrink.

Of course, the actuator 270 can also be used to move the projection lens group 220 to achieve the effect of changing the size and position of the floating real image 260, as shown in FIG. The direction of movement, the direction of movement of M2 or the way of rotation of M3. As shown in FIG. 7B , when the position of the projection lens group 220 moves from position P1 to position P2, the corresponding imaging position of the floating real image 260 also moves from position P1 to position P2, and at the same time, the imaging magnification is less than 1. That is, the floating real image is reduced by 260°. In the above-mentioned embodiments of FIG. 7A and FIG. 7B , for the convenience of description, a single optical path is used for illustration. When there are multiple optical paths in the display device, the same principle applies, and details are not repeated here.

FIG. 7C is a schematic diagram showing that the display device can adjust the position of the floating real image according to the user's position in an embodiment of the present invention. As shown in FIG. 7C, when the depth of the finger of the user 10 touching the floating real image 260 moves from position P1 to position P2, the depth detection module 240 detects the position change of the finger of the user 10, and feeds back to the control unit 250 (shown in FIG. 1 and 11 ), the control unit 250 (shown in FIGS. 1 and 11 ) transmits movement information to the image generator 210, so that the image generator 210 moves from the position P1 to the position P2 accordingly. Thereby, the imaging position of the corresponding floating real image 260 can be moved from the original position P1 to the position P2. In addition, the way of sensing the position of the user 10 can also be to use the depth detection module 240 to detect various body changes of the user 10, or to use the object (such as a stylus, etc.) used by the user 10. changes, the present invention is not limited thereto.

The following will take the display devices shown in FIG. 2 and FIG. 4 as examples to illustrate the implementation when each display device intends to present a stereoscopic image.

FIGS. 8A and 8B respectively show schematic diagrams when a user wears a pair of stereoscopic glasses to view the display device having the projection mirror assembly shown in FIG. 2 . As shown in FIG. 8A , in the display device 300 of this embodiment, the image generator 210 is, for example, a display panel, and the stereoscopic glasses 280 are, for example, shutter glasses 282 with a scanning frequency. In particular, when the switching rate of the shutter glasses 282 is synchronized with the scanning frequency of the image generator 210 , the user 10 can watch the virtual three-dimensional floating real image 260 displayed on a single display panel through the shutter glasses 282 . For example, the display frequency of the display panel is, for example, 120 Hz, and the frequency of the switching rate of the shutter glasses 282 is, for example, 60 Hz. In other words, the display panel alternately displays the left-eye image 212L of 1/120 second and the right-eye image 212R of 1/120 second, and the left and right eyeglass lenses of the shutter glasses 282 are respectively opened and closed once in 1/60 second. By switching, the user 10 can view the three-dimensional floating real image 260 through the shutter glasses 282 . In addition, the floating real image 260 with a stereoscopic image can be formed by a plurality of sub-floating real images 260a located on the same plane, or can be composed of a plurality of sub-floating real images 260a located on different planes. This is not the limit. In other words, the display device 300 in FIG. 8A utilizes timing switching to make the floating real image 260 present a stereoscopic image, so the resolution of the image can be maintained.

Another implementation mode is shown in FIG. 8B. In the display device 400 of this embodiment, the scanning frequency of the image generator 210 can be 60 Hz, and the stereoscopic glasses 280 are, for example, a pair of polarized glasses 284, which have two polarized glasses with different polarization directions. Polarized lenses 284R, 284L. For example, the right-eye polarizing lens 284R has a vertical polarization direction p, and the left-eye polarizing lens 284L has a horizontal polarization direction s, for example. The image 212 displayed on the display panel includes a right-eye image 212R with a vertical polarization direction p and a left-eye image 212L with a horizontal polarization direction s. Therefore, when the user 10 wears the polarized glasses 284 to watch, he can watch the virtual three-dimensional floating real image 260 displayed on the single display panel. In the same way, the floating real image 260 with a stereoscopic image can be formed by a plurality of sub-floating real images 260a located on the same plane, or can be composed of a plurality of sub-floating real images 260a located on different planes. It is not limited to this. In other words, the display device 400 in FIG. 8B utilizes spatial synthesis to make the floating real image appear as a stereoscopic image, so there is no need to accelerate the display frequency of the display panel, and the control on the circuit can be simplified.

FIG. 9A and FIG. 9B respectively show schematic diagrams when a user wears a pair of stereoscopic glasses to watch a display device having the projection lens set in FIG. 4 . Please refer to FIG. 9A first. In the display device 500 of this embodiment, the image generator 210 is, for example, two display panels, and the stereoscopic glasses 280 are, for example, a pair of shutter glasses 282 with a scanning frequency. In particular, when the switching rate of the shutter glasses 282 is synchronized with the scanning frequency of the image generator 210, the user 10 can view the images displayed by the first image generator 210A and the second image generator 210B through the shutter glasses 282. The resulting virtual three-dimensional floating real image 260. For example, the display frequency of the first image generator 210A and the second image generator 210B is, for example, 60 Hz, and the frequency of the switching rate of the shutter glasses 282 is, for example, 60 Hz. In other words, the first image generator 210A can display a left-eye image 212L every 1/60 second, and the second image generator 210B can display a right-eye image 212R every 1/60 second, and the left and right glasses of the shutter glasses 282 The chips are switched on and off in 1/60 second respectively. In the same way, the floating real image 260 with a stereoscopic image can be formed by a plurality of sub-floating real images 260a located on the same plane, or can be composed of a plurality of sub-floating real images 260a located on different planes, depending on the display. Depending on the effect, the present invention is not limited thereto. In other words, the display device 500 in FIG. 9A utilizes two image generators 210 to make the floating real image 260 present a three-dimensional image. Therefore, the resolution of the image 212 can be maintained, and the display frequency of the display panel does not need to be accelerated. control on the circuit.

In addition, as shown in FIG. 9B, in the display device 600 of this embodiment, the image generator 210 is similar to that of FIG. 9A. The image generator 210 is, for example, two display panels. Similar to the glasses 284 , the right-eye polarized lens 284R has, for example, a vertical polarization direction p, and the left-eye polarized lens 284L has, for example, a horizontal polarization direction s. The first image generator 210A of this embodiment, for example, displays a left-eye image 212L with a horizontal polarization direction s, and the second image generator 210B, for example, displays a right-eye image 212R with a vertical polarization direction p. Therefore, when the user 10 wears polarized glasses 284 to watch, he can watch the virtual three-dimensional floating real image 260 displayed by the two display panels. In the same way, the floating real image 260 with a stereoscopic image can be formed by a plurality of sub-floating real images 260a located on the same plane, or can be composed of a plurality of sub-floating real images 260a located on different planes. It is not limited to this. In other words, the display device 500 in FIG. 9B utilizes two image generators 210 to make the floating real image 260 present a stereoscopic image, so the resolution of the image can be maintained, and the display frequency of the display panel does not need to be accelerated, and the circuit can be simplified. on the control.

It is worth noting that, in practical applications, the display device of the present invention can move the image generator or the projection mirror group quickly, and cooperate with the synchronous display of the image generator, and use the characteristic of human visual persistence to obtain multi-layer image stacking. The three-dimensional floating image produced includes a floating real image with binocular parallax, a floating real image with moving parallax, or a combination of the two. Of course, in practical applications, due to the difference in imaging position, the imaging size will also be reduced or enlarged due to the relationship between the object and the image, or the floating real image is distorted due to the limitation of the projection lens group itself, and the display part can be further used as the front end. image processing to achieve the best display effect. In addition, when the display device is a naked-eye stereoscopic display, when the position and size of the floating real image are adjusted by changing the object distance, the relevant design parameters of the image generator (display panel) can be further corrected so that the user can watch the best image. 3D effect. Specifically, by adjusting the optical elements in the projection lens group of the display device, for example, the parallax barrier can be changed into a liquid crystal parallax barrier, by adjusting the period of the parallax barrier, or by adjusting the parallax barrier and display pixels. The distance between them is used to achieve the three-dimensional effect to be presented, so as to avoid the problem that the imaged floating real image does not lose the three-dimensional effect due to the change of the position of the image generator. This part can refer to the applicant's previous case Co-pending USPA 61528766METHOD FOR AUTOSTEREOSCOPIC DISPLAY.

Specifically, FIG. 10A and FIG. 10B are schematic diagrams of using a naked-eye 3D stereoscopic display panel instead of a general 2D flat display panel in the display device of the present invention. Please refer to FIG. 10A , the naked-eye 3D stereoscopic display panel 210' forms a stereoscopic 3D floating real image 260' at the imaging end through the projection lens group 220, and at the same time, the viewing area ZA of the original naked-eye stereoscopic 3D display panel 210' best viewing position is passed through The projection lens group 220 forms the viewing area ZB of the best viewing position of the stereoscopic 3D floating real image 260' floating in the air at the imaging end, as shown in FIG. The object-image relationship between the panel 210' and the stereoscopic 3D floating real image 260', and the field of view range ZA of the best viewing position of another naked-eye 3D stereoscopic display panel 210' and the viewing area range of the best viewing position of the stereoscopic 3D floating real image 260' For the object-image relationship of ZB, the imaging position and magnification of the two object-image relationships must be considered at the same time. Please refer to FIG. 10A and FIG. 10B at the same time. The depth detection module 240 can detect the position and size of the user 10 or the stereoscopic 3D floating real image 260', so as to feed back the naked-eye 3D stereoscopic display panel 210' and the projection mirror group 220. The magnification M of the lens group 220 can convert the size of the image projected by the naked-eye 3D stereoscopic display panel 210' in the viewing zone ZA to be E/M, where E is the size of the image located in the viewing zone ZB, and the naked-eye 3D stereoscopic display panel 210 The size SS of the image provided, the distance T between the naked-eye 3D stereoscopic display panel 210' and the viewing zone ZA, the size E/M of the image provided by the naked-eye 3D stereoscopic display panel 210', etc. will satisfy the following relationship:

$<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; SS</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; E.</span>}}{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; \&Delta;N</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; t</span>}}{\mathrm{<span\; class="notranslate">\; no</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\frac{\mathrm{<span\; class="notranslate">\; T</span>}}{\mathrm{<span\; class="notranslate">\; no</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ,</span>$

$\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; SS</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; T</span>}}{\mathrm{<span\; class="notranslate">\; no</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; t</span>}}{\mathrm{<span\; class="notranslate">\; no</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\frac{\mathrm{<span\; class="notranslate">\; T</span>}}{\mathrm{<span\; class="notranslate">\; no</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; .</span>$

Among them, n1 and n2 are the refractive index between the parallax barrier and the display panel and between the parallax barrier and the viewer, n1 is, for example, glass 1.523, and n2 is, for example, air 1, P is the period of the parallax barrier, t is the parallax barrier and the display The distance between the panels, N is the number of viewing zones of the stereoscopic display panel, and ΔN is the difference in viewing zones seen by the viewer, for example, the left and right eyes see 1 and 3 viewing zones respectively, then ΔN is 2, so that the display device of the present invention can Based on the position of the user 10 detected by the depth detection device or the position and size of the three-dimensional 3D floating real image 260 ′, the magnification and imaging position of the projection lens group are adjusted accordingly.

FIG. 11 is a schematic structural diagram of a display device in an embodiment of the present invention. Please refer to FIG. 11 , in this embodiment, the device for generating the first image 212A is, for example, a display panel, and the device for generating the second image 212B is, for example, an entity with buttons. Through the aforementioned projection lens set 220 , the button can be projected in front of the user 10 to generate a floating real image 260 of the three-dimensional button with a sense of depth. When the user 10 watches at a proper viewing position, the floating real image 260 floats, for example, 20 cm in front of the projection lens set 220 , and the user 10 can view the floating real image 260 at a position 70 cm in front of the projection lens set 220 . In this way, the distance from the user 10 to the floating image 260 is 50 centimeters, which is just a comfortable distance for ordinary people to touch objects with their arms. In one usage scenario, when the user 10 touches any key, the depth detection module 240 can detect the position of the key touched by the finger of the user 10, and feed back the touch information to the control unit 250 to respond Relative information (such as default image or sound feedback information) is given to the user 10, so that an interactive effect can be achieved.

In addition, the display device of the present invention can also use the aforementioned active depth detection module 240 to make the display device respond to the user. In other words, the display device of the present invention not only has image changes as shown in FIGS. 10A and 10B , but also can feed back and control the overall system of the display device through the active depth detection module 240 to achieve interactive functions. The following further describes the depth detection module 240 .

Another embodiment of the present invention has an active depth detection module 240, combined with the aforementioned optical design, it can provide users with human-computer interaction with real images floating in free space, so that viewers can touch floating in natural space The image, and by detecting the change of the depth of the finger, generates corresponding image content and achieves an interactive effect.

For an active depth detection module used in the present invention, please refer to the previous Co-pending USPA 61475648 Apparatus and Method for Depth Image Capturing. The specific pattern is projected on the measured object by active light sources, and the depth image information is calculated by using the real image and virtual image comparison technology. The active light source projection device is composed of a light source and a set of designed diffractive optical mirrors, which can generate irregularly distributed bright spot images, control the size of the incident beam and change the distribution density of the bright spot images. In principle, the calculation of the depth image is based on the image comparison technology. In addition to obtaining the images of the projected patterns by two sets of synchronous cameras, the present invention further uses the projection device as a virtual camera to calculate the space between each set of cameras and the projection device. Correspondence, and then use these disparity (disparity) images for cross-validation to improve its accuracy and compensate for the problem of image occlusion.

Please refer to Fig. 11, the present invention uses the above-mentioned combination of optical structure and display image to project an image of special content in free space. As mentioned above, the image includes various two-dimensional and three-dimensional images, for example, a The intuitive three-dimensional buttons are displayed in the space. When the user 10 watches at the appropriate viewing position, the above-mentioned optical design floats the image 20 cm in front of the projection mirror group 220, and the viewer can stand at a position 70 cm in front of the projection mirror group 220 to watch. In this way, the distance between the user 10 and the image is 50 centimeters, which is just about the comfortable distance for ordinary people to touch objects with their arms. When the user 10 touches the button (the second sub-floating real image), the active depth detection The module 240 will be able to detect where the finger is and lightly press the button; since the action of just touching the button without pressing the button cannot achieve the simulation effect of pressing the button normally, the active depth detection module can detect the pressed button This slight change in finger depth is fed back to the control unit 250 to respond to the corresponding information, including image or sound feedback information. The overall structure is shown in FIG. 11 .

The active depth detection module of the present invention can be used in any of the optical structures and image terminals mentioned above, and can be used in many public places, such as cash machines, public telephones, and navigation systems, in conjunction with the production of display images and the generation of feedback information. In addition, in order to make the simulation effect more realistic, a forced feedback device can be added to increase the realism of touching the floating image.

In addition to the above-mentioned reference Co-pending USPA 61475648 Apparatus and Method for Depth Image Capturing, the active depth detection module can project a specific pattern on the measured object, and can also project a specific wavelength light source. Most of them use infrared light sources, which are less prone to Affected by external visible light, the depth is detected through the reflected signal. In addition to the active depth detection module, a passive depth detection module can also be used, such as using dual cameras to capture images, and obtain depth information through image comparison.

In addition to detecting changes in the depth of fingers, the depth detection module proposed by the present invention can also be used to detect changes in various users' limbs, or changes in objects, such as stylus pens and other related objects.

In addition, the display device can also include an interactive module composed of a depth detection module and a forced feedback system, and the forced feedback system is connected with the depth detection module. The depth detection module can be an active depth detection module or a passive depth detection module. Specifically, in one embodiment, the active detection module can use more than one photosensitive element to project an active light source with a specific pattern on the object under test, and use real image and virtual image comparison technology, Calculate its depth image information. In another embodiment, the active detection module can also use a photosensitive element to actively emit laser light on the object to be measured, and calculate its depth image information by triangulation. Alternatively, the active detection module can also use an ultrasonic receiver to actively emit ultrasonic waves on the object to be measured, and use the round-trip time of the sound waves to calculate its depth information. In addition, the depth detection module is suitable for detecting the spatial position of the user's limbs or the operating object, so as to perform interactive control with floating real image images at different depth positions. The forced feedback system then gives back the tactile sensation of touching the floating real image to the user, so that the user can interact with the floating real image.

To sum up, the display device of the present invention can generate a floating real image between the projection lens set and the user by making the light beams emitted from the projection lens set satisfy a specific relationship. Moreover, the position of the user is detected by the depth detection module, and the image generator and the projection lens group can be controlled according to the user's In some embodiments, the floating real image is a stereoscopic image, or the three-dimensional floating real image can also be viewed through stereoscopic glasses. Therefore, the display device of the present invention can provide users with more lifelike interaction and experience.

Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Anyone skilled in the art should be able to make minor changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection of the invention should be defined by the claims.

Claims (23)

1. a display device is characterized in that, is suitable for allowing the user watch, and this display device comprises:

At least one image generator is suitable for showing at least one image;

Projection lens's group, between this image generator and this user, this image projects via this projection lens's group and produce floating real image between this projection lens's group and this user, each light beam that wherein consists of this floating real image has the light taper angle theta, wherein respectively this light beam comprises chief ray and a plurality of marginal ray, respectively have angle α between this marginal ray and corresponding this chief ray, and this light taper angle theta=2 α;

Degree of depth detecting module, detect this user's position, this image generator and this projection lens's group are adjusted the position of this floating real image according to this user's position, wherein this floating real image is of a size of L, distance between two of this users is W, distance between this user and this floating real image is D, and this light taper angle theta satisfies following relationship:

$\mathrm{\&theta;}\&GreaterEqual;{\tan }^{-1}\left(\frac{L+W}{D}\right);$ And

Control module is electrically connected with this image generator, this projection lens's group and this degree of depth detecting module.

2. display device according to claim 1, it is characterized in that, the movement of this image generator is controlled in this user's that this control module is detected according to this degree of depth detecting module position, with the relative position of adjusting this image generator and this projection lens's group, the position of this floating real image and the size of this floating real image.

3. display device according to claim 1 is characterized in that, the quantity of this image generator is 1, and this projection lens's group comprises two lens combination, and this two lens combination is positioned on the projected path of this image.

4. display device according to claim 1 is characterized in that, the quantity of this image generator is 1, and this projection lens's group comprises:

Reverberator is positioned on the projected path of this image;

The first lens group is comprised of a slice lens at least, and total focal length be on the occasion of, be positioned on the projected path of this image, and between this image generator and this reverberator; And

The second lens combination is comprised of a slice lens at least, and total focal length be on the occasion of, be positioned on the projected path of this image, and between this reverberator and this user.

5. display device according to claim 1, it is characterized in that, this image generator comprises the first image generator and the second image generator, and this first image generator shows the first image, and this second image generator shows the second image, and this projection lens's group comprises:

Close optical element, be positioned on the projected path of this first image and this second image, this closes optical element and reflects this first image and allow this second image to pass through;

The first lens group is comprised of a slice lens at least, is positioned on the projected path of this first image, and closes between the optical element at this first image generator and this;

The second lens combination is comprised of a slice lens at least, is positioned on the projected path of this second image, and closes between the optical element at this second image generator and this; And

The 3rd lens combination is comprised of a slice lens at least, is positioned on the projected path of this first image and this second image, and closes between optical element and this user at this.

6. display device according to claim 1, it is characterized in that, this image generator comprises the first image generator, the second image generator and the 3rd image generator, this first image generator shows the first image, this second image generator shows the second image, and the 3rd image generator shows the 3rd image, and this projection lens's group comprises:

First closes optical element, is positioned on the projected path of this first image, this second image and the 3rd image, and this first closes optical element and reflect this first image and the 3rd image and allow this second image to pass through;

Second closes optical element, is positioned on the projected path of this first image and the 3rd image, and this second closes optical element and reflect the 3rd image and allow this first image to pass through;

The first lens group is comprised of a slice lens at least, is positioned on the projected path of this first image and the 3rd image, and second closes optical element and this first and close between the optical element at this;

The second lens combination is comprised of a slice lens at least, is positioned on the projected path of this second image, and closes between the optical element at this second image generator and this first;

The 3rd lens combination is comprised of a slice lens at least, is positioned on the projected path of this first image, this second image and the 3rd image, and first closes between optical element and this user at this; And

The 4th lens combination is comprised of a slice lens at least, is positioned on the projected path of the 3rd image, and closes between the optical element at the 3rd image generator and this second.

7. display device according to claim 1 is characterized in that, the quantity of this image generator is a plurality of, and this floating real image comprises a plurality of sub floating real images that are positioned on the Different Plane.

8. display device according to claim 1 is characterized in that, the quantity of this image generator is a plurality of, and this floating real image comprises a plurality of sub floating real images that are positioned on the same level.

9. display device according to claim 1, it is characterized in that, the quantity of this image generator is at least one, and this floating real image comprises the floating real image of at least one solid, wherein should comprise the floating real image of the floating real image of binocular parallax, mobile parallax or the combination of the two by the floating real image of solid.

10. display device according to claim 1 is characterized in that, the size of this floating real image is greater than or less than the size of this image.

11. display device according to claim 1 is characterized in that, the size of this floating real image equals the size of this image.

12. display device according to claim 1 is characterized in that, also comprises anaglyph spectacles, wherein this user is stereo-picture through viewed this floating real image of this anaglyph spectacles.

13. display device according to claim 12 is characterized in that, this anaglyph spectacles is shutter glasses, and this image generator has sweep frequency, and the sweep frequency of the switching rate of this shutter glasses and this image generator is synchronous.

14. a described display device is characterized in that according to claim 12, this anaglyph spectacles is polaroid glasses, and these polaroid glasses have two polarized lenses, and this two polarized lenses has different polarization directions.

15. display device according to claim 1 is characterized in that, this image generator comprises display panel, light-emitting component or the object that is shone by light.

16. display device according to claim 1 is characterized in that, this display device also comprises interactive module, and wherein this interactive module comprises:

This degree of depth detecting module; And

The force feedback system is connected with this degree of depth detecting module.

17. display device according to claim 16 is characterized in that, this degree of depth detecting module is active degree of depth detecting module.

18. display device according to claim 16 is characterized in that, this degree of depth detecting module is passive type degree of depth detecting module.

19. described display device according to claim 17, it is characterized in that, the photo-sensitive cell of this active detecting module by more than one, with active light source projects specific pattern line on measurand, utilize true picture and virtual image comparison technology, calculate its depth image information.

20. display device according to claim 17 is characterized in that, this active detecting module is by a photo-sensitive cell, and the active laser that sends utilizes triangle telemetry to calculate its depth image information on measurand.

21. display device according to claim 17 is characterized in that, this active detecting module is by a ultrasonic receiver, and active emission ultrasound wave utilizes the sound wave time back and forth to calculate its depth information on measurand.

22. display device according to claim 17 is characterized in that, this degree of depth detecting module is suitable for detecting the locus of this user's limbs or operating article, and carries out interaction control with this floating real image image of different depth position.

23. display device according to claim 17 is characterized in that, the sense of touching that this force feedback system will touch this floating real image feeds back to this user.

Images