TWI677707B - Head mounted display device and image projection method - Google Patents

Abstract

Head-mounted display device and image projection method. The head-mounted display device includes an optical waveguide element, an imaging device, an optical conversion layer, and a processor. The optical waveguide element receives the image beam and projects the image through the surface. The image device is used for providing an image beam. The optical conversion layer is arranged to overlap the edge of the surface of the optical waveguide element. The optical conversion layer deflects the projection image of the part according to the command signal to generate an adjusted projection image, so that the adjusted projection image is transmitted to the projection target. The processor generates a command signal according to the position of the projection target.

Description

Head-mounted display device and image projection method

The present invention relates to a display device and an image projection method, and more particularly, to a head-mounted display device and an image projection method.

With the rapid development of electronic products, the display effects of virtual reality (VR) and augmented reality (AR) on the provision of high-quality video and audio display interfaces have become the pursuit of a new generation of display devices. Targets, among which Head Mounted Display (HMD) is a display device used to implement this technology.

In many designs of the conventional Augmented Reality-Head Mounted Display (AR-HMD), the viewing angle of the augmented reality image generated by it is too small to allow users to have Realistic and immersive feelings. Therefore, how to make the head-mounted display device have a wider viewing angle is really the focus of attention of those in the field.

The invention provides a head-mounted display device and an image projection method thereof, which can improve the viewing angle.

The head-mounted display device of the present invention includes an optical waveguide element, an image device, an optical conversion layer, and a processor. The optical waveguide element receives the image beam and projects the image through the surface. The image device is used for providing an image beam. The optical conversion layer is arranged to overlap the edge of the surface of the optical waveguide element. The optical conversion layer deflects the projection image of the part according to the command signal to generate an adjusted projection image, so that the adjusted projection image is transmitted to the projection target. The processor is coupled to the optical conversion layer and generates a command signal according to the position of the projection target.

The image projection method of the present invention includes: providing an optical waveguide element to receive an image light beam, and projecting a projection image through a surface. A command signal is generated according to the position of the projection target. An optical conversion layer is arranged to overlap the edge of the surface of the optical waveguide element, so that the optical conversion layer deflects the projection image of the part according to the command signal so as to generate an adjusted projection image, so that the adjusted projection image is transmitted to the projection target.

Based on the above, the head-mounted display device and image projection method provided by the present invention, by providing an optical conversion layer on the optical waveguide element, deflects a part of the projection image that could not be transmitted to the projection target to generate an adjusted projection image and makes The adjusted projection image is transmitted to the projection target to achieve the purpose of improving the viewing angle of the head-mounted display device.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

100, 200, 300, 400, 500‧‧‧ head-mounted display devices

110, 110L‧‧‧Optical waveguide components

113‧‧‧Into the light surface

1131‧‧‧Near eye area

1133, 1135‧‧‧Edge

115‧‧‧ surface

1151, 1151a‧‧‧ near eye area

1153, 1153a, 1155, 1155a

120, 120L‧‧‧Translucent element

130, 130L‧‧‧Image device

140‧‧‧Processor

150, 150a, 150b, 150L‧‧‧Optical conversion layer

150-1, 150-1L, 150-2, 150-2L‧‧‧ Conversion layer

151a‧‧‧LCD layer

151b‧‧‧ 稜鏡

153a‧‧‧Driver

153b‧‧‧Actuator

160‧‧‧ Projection target detector

170‧‧‧Optical shielding layer

171‧‧‧light shielding component

180, 180L‧‧‧Optical layer

190‧‧‧Optical compensation layer

A1, B1, A2, B2, A3, B3

DS‧‧‧ Command signal

E1, E2‧‧‧‧ Projection target

ES‧‧‧ detection results

L‧‧‧ Ambient light

L0‧‧‧External Object Image

S1, S2‧‧‧‧ sight

V‧‧‧Drive voltage

S810 ~ S840‧‧‧Steps of image projection method

FIG. 1 is a schematic diagram of a head-mounted display device according to an embodiment of the invention.

FIG. 2 is a schematic diagram of an optical conversion layer according to an embodiment of the invention.

FIG. 3 is a schematic diagram illustrating another embodiment of an optical conversion layer according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a head-mounted display device according to another embodiment of the invention.

FIG. 5 is a schematic diagram of a head-mounted display device according to another embodiment of the present invention.

FIG. 6 is a schematic diagram of a head-mounted display device according to another embodiment of the present invention.

FIG. 7 is a schematic diagram of a head-mounted display device according to another embodiment of the present invention.

FIG. 8 is a flowchart of an image projection method according to an embodiment of the present invention.

Please refer to FIG. 1, which is a schematic diagram of a head-mounted display device according to an embodiment of the present invention. The head-mounted display device 100 includes an optical waveguide device 110, an imaging device 130, and an optical conversion layer 150. The image device 130 is used to provide an image beam (not shown). The optical waveguide element 110 receives the image light beam and transmits a projection image (not shown) through the surface 115. The optical conversion layer 150 is disposed overlapping the edge of the surface 115, wherein the conversion layer 150-1 is a portion of the optical conversion layer 150 located on the edge 1153 of the surface 115, and the conversion layer 150-2 is the edge of the optical conversion layer 150 on the surface 115 Part of 1155. The processor 140 is coupled to the optical conversion layer 150 and according to the projection target E1 To generate the command signal DS. The optical conversion layer 150 deflects the projection image of the part according to the command signal DS to generate an adjusted projection image (not shown), so that the adjusted projection image is transmitted to the projection target E1. In this embodiment, the portion of the projection image projected from the surface 115 of the optical waveguide element 110 among the projection images projected from the surface 115 of the optical waveguide element 110 is deflected toward the projection target E1 through the arrangement of the optical conversion layer 150 to improve the visibility of the head-mounted display device 100 angle.

In detail, after the image light beam provided by the image device 130 is incident on the optical waveguide element 110, it is conducted by the optical waveguide element 110 and the projected image is projected from the surface 115. The projection image may include a near-eye projection image (not shown) near the projection target E1 and an edge projection image (not shown) far from the projection target E1. The near-eye projection image is a part of the projection image that is projected by the near-eye region 1151 of the surface 115. The edge projected image is the part projected by the edges 1153 and 1155 of the surface 115. In this embodiment, the projection target E1 may be, for example, a user's eyeball, and the line of sight of the projection target E1 when viewing the head-mounted display device 100 is the line of sight S1.

When the optical conversion layer 150 is inactive, only the near-eye projection image projected from the near-eye region 1151 can be transmitted to the projection target E1, and the edges projected by the edges 1153 and 1155 are limited by the optical waveguide element 110 on the image beam conduction. The projected image cannot be transmitted to the projection target E1. At this time, the viewing angle at which the projection target E1 views the head-mounted display device 100 is the viewing angle A1.

When the optical conversion layer 150 functions, the conversion layers 150-1 and 150-2 of the optical conversion layer 150 deflect the edge projection image toward the projection target E1, so that the edge projection images projected by the edges 1153 and 1155 can be transmitted to the projection target. E1, let the projection eye The viewing angle at which the head-mounted display device 100 is viewed from the standard E1 is increased from the viewing angle A1 to the viewing angle B1. Therefore, in this embodiment, the role of the optical conversion layer 150 can transfer the edge projection image that could not be transmitted to the projection target E1 to the projection target E1, and transmit to the projection target E1, thereby improving the performance of the head-mounted display device 100. Purpose of viewing angle.

In addition, the angle at which the optical conversion layer 150 deflects a part of the projected image toward the projection target E1 is, for example, between 0 degrees and 10 degrees. Compared with the conventional head-mounted display device, the viewing angle can be about 40 °. In this embodiment, the edge conversion image is deflected toward the projection target E1 through the setting of the optical conversion layer 150, and the viewing angle of the head-mounted display device 100 can be increased to more than 60 °. This implementation result is only an example, and is not intended to limit the present invention.

It is worth mentioning that the ambient light L can pass through the optical conversion layer 150 and be transmitted to the projection target E1 after being incident on the optical waveguide element 110. Therefore, both the projected image for display and the external ambient light L can enter the projection target E1, and the head-mounted display device 100 can achieve the display effect of augmented reality.

For example, the image device 130 in this embodiment may include, for example, a micro liquid crystal display panel (Liquid Crystal Display panel, LCD panel), a liquid crystal on silicon (LCOS) micro display, or other types of micro displays. The invention is not limited to this. In addition, the optical waveguide element 110 may be, for example, a scattering waveguide element, a holographic waveguide element, a polarized waveguide element, or a reflective waveguide element, and the present invention does not limit the imaging device 130 from injecting an image beam into the optical waveguide element 110 As long as the image beam can be transmitted by the optical waveguide element 110 and the projection image can be projected toward the projection target E1. Example of material of optical waveguide element 110 If it is at least one of glass or plastic, but the present invention is not limited thereto, the optical waveguide element 110 may also be other appropriate transparent materials. The processor 140 may be, for example, a processing circuit, and the processing circuit may include a controller and related circuits.

Please refer to FIG. 2. FIG. 2 is a schematic diagram of an optical conversion layer according to an embodiment of the present invention. The optical conversion layer 150 a shown in FIG. 2 is an embodiment of the optical conversion layer of the head-mounted display device 100 of the embodiment shown in FIG. 1. The optical conversion layer 150a includes a liquid crystal layer 151a and a driver 153a. The liquid crystal layer 151 a is disposed to overlap the edges 1153 and 1155 of the surface 115 of the optical waveguide element 110. The driver 153a is coupled to the liquid crystal layer 151a, and adjusts the liquid crystal layer 151a according to the command signal DS to provide a driving voltage V. Therefore, the processor 140 may control the liquid crystal layer 151a so that a part of the projected image is refracted by the liquid crystal layer 151a to deflect toward the projection target E1, so that the edge projected image projected by the edge 1153 and / or 1155 of the surface 115 is directed toward the projection target E1. It is folded and passed to the projection target E1 to achieve the purpose of improving the viewing angle of the head-mounted display device 100. The optical conversion layer 150a shown in FIG. 2 is merely an example, and is not intended to limit the present invention.

Please refer to FIG. 3, which is a schematic diagram illustrating another embodiment of an optical conversion layer according to an embodiment of the present invention. The optical conversion layer 150 b shown in FIG. 3 is another embodiment of the optical conversion layer of the head-mounted display device 100 of the embodiment shown in FIG. 1. The optical conversion layer 150b includes at least one 151b and an actuator 153b. At least one of the ridges 151b is disposed overlapping the edges 1153 and / or 1155 of the surface 115 of the optical waveguide element 110. The actuator 153b is coupled to at least one 151b and receives a DS command signal. Actuator 153b and adjust the rotation angle of 稜鏡 151b according to the command signal DS, so that The sub-projection image is refracted by 稜鏡 151b to deflect toward the projection target E1. Therefore, the processor 140 can control the optical conversion layer 150b so that the edge projection image projected from the edge 1153 and / or 1155 of the surface 115 is deflected toward the projection target E1 and transmitted to the projection target E1, so as to improve the head-mounted display device 100. The purpose of the viewing angle. The present invention does not limit the number of optical conversion layers 150b having 稜鏡 151b, and the actuators 153b of the optical conversion layer 150b can be implemented by, for example, a microelectromechanical systems (MEMS) device. The optical conversion layer 150b shown in FIG. 3 is merely an example, and is not intended to limit the present invention.

Please refer to FIG. 4, which is a schematic diagram of a head-mounted display device according to another embodiment of the present invention. The head-mounted display device 200 of this embodiment is similar to the head-mounted display device 100 of the embodiment shown in FIG. 1 in structure and functions and effects are the same. This embodiment is different from the embodiment shown in FIG. 1 in that the head-mounted display device 200 further includes a projection target detector 160, and the projection target detector 160 is coupled to the processor 140. The projection target detector 160 is used to detect the position of the projection target E1 to generate a detection result ES. The processor 140 receives the detection result ES to generate a command signal DS.

In detail, the projection target E1 is, for example, a user's eyeball, and the projection target detector 160 can be, for example, an eyeball sight detector. In this embodiment, the line of sight of the projection target E1 when viewing the head-mounted display device 200 is the line of sight S2 as an example. The projection image projected from the surface 115 of the optical waveguide element 110 includes a near-eye projection image (not shown) near the line of sight S2 and an edge projection image (not shown) far from the line of sight S2. Part of the near-eye region 1151a projected by the edge projection image is the edge of the surface 115 in the projected image 1153a and 1155a. The near-eye projection image passes through the optical conversion layer 150c and is transmitted to the projection target E1, and the viewing angle of the near-eye projection image of the projection target E1 is the viewing angle A2. The processor 140 controls the optical conversion layer 150c according to the detection result ES to deflect the edge projection image toward the projection target E1. Therefore, by detecting the position of the projection target E1 through the projection target detector 160, the processor 140 only needs to control the deflection or non-deflection of a part of the projection image in the optical conversion layer 150c that is within the viewing angle B2, and can improve The purpose of the viewing angle is to reduce the driving range required for the optical conversion layer 150c, and to reduce the required driving voltage and driving time. The optical conversion layer 150c may be implemented by, for example, the optical conversion layer 150a shown in FIG. 2 or the optical conversion layer 150b shown in FIG. 3, and its operation principle is not described herein again.

Please refer to FIG. 5, which is a schematic diagram of a head-mounted display device according to another embodiment of the present invention. The head-mounted display device 300 of this embodiment is similar to the head-mounted display device 100 of the embodiment described in FIG. 1 in structure and has the same function and effect. This embodiment is different from the embodiment described in FIG. 1 in that the head-mounted display device 300 further includes an optical shielding layer 170, and the optical shielding layer 170 is located on the transmission path of the ambient light L. The optical shielding layer 170 includes a plurality of light shielding components 171. The processor 140 controls the optical shielding layer 170 to cause a part of the light shielding component 171 to block part of the ambient light L incident on the optical waveguide element 110. Thereby, the optical shielding layer 170 can block the ambient light L according to the needs of the augmented reality application. For example, when the head mounted display device 300 executes a specific augmented reality application, it may not want objects in certain environments to appear in the augmented reality. At this time, the processor 140 may control the optical shielding layer 170 to block ambient light. The light of this object in L makes it invisible to the user.

In addition, the processor 140 may also control the optical shielding layer 170 to block the ambient light L according to the image light beam provided by the image device 130. In this way, the processor 140 can control the optical shielding layer 170 to block part of the ambient light L corresponding to the projected image, improve the contrast when viewing the projected image, reduce the influence of the ambient light L on the projected image, and improve Display quality.

Specifically, each light shielding component 171 of the optical shielding layer 170 may include, for example, a liquid crystal layer (not shown). The processor 140 controls the liquid crystal layer to shield a part of the ambient light L passing through the light shielding component 171 to reduce a part of the ambient light L incident to the optical waveguide element 110. However, this embodiment is only an implementation of the optical shielding layer 170 and is not intended to limit the present invention.

Please refer to FIG. 6, which illustrates a schematic diagram of a head-mounted display device according to another embodiment of the present invention. The head-mounted display device 400 of this embodiment is similar to the head-mounted display device 100 of the embodiment shown in FIG. 1 in structure and functions and effects are the same. This embodiment is different from the embodiment described in FIG. 1 in that the head-mounted display device 400 further includes an optical compensation layer 190, and the optical compensation layer 190 is disposed on the transmission path of the ambient light L. The optical compensation layer 190 receives the external object image L0 and causes the external object image L0 to be projected toward the projection target E1, thereby increasing the viewing angle of the head-mounted display device 400 to the external object image L0.

Specifically, the ambient light L is incident on the optical waveguide element 110 through the light incident surface 113. The ambient light L includes near-eye ambient light (not shown) near the projection target E1 and edge ambient light (not shown) far from the projection target E1. The near-eye ambient light is the near-eye area 1131 of the ambient light L from the light incident surface 113. Incident part while edge ring The ambient light is a portion of the ambient light L incident from the edge regions 1133 and 1135 of the light incident surface 113. When the optical compensation layer 190 is inactive, due to the influence of the elements of the head-mounted display device 400, only the near-eye ambient light incident from the near-eye region 1131 can be transmitted to the projection target E1, and the edge environment incident from the edge regions 1133 and 1135 Light cannot be transmitted to the projection target E1. At this time, the viewing angle at which the projection target E1 views the ambient light L is the viewing angle A3.

When the optical compensation layer 190 is functioning, near-eye ambient light passes through the optical compensation layer 190 and is transmitted to the projection target E1. The optical compensation layer 190 deflects the edge ambient light toward the projection target E1 so that the edge ambient light incident from the edge regions 1133 and 1135 can be transmitted to the projection target E1. Therefore, the viewing angle of the projection target E1 to view the ambient light L can be increased to the viewing angle B3. Accordingly, in this embodiment, the edge ambient light that could not be transmitted to the projection target E1 can be deflected toward the projection target E1 through the effect of the optical compensation layer 190, and can be transmitted to the projection target E1 to improve the viewing angle of the ambient light L. The external object image L0 is, for example, an image of an object in the ambient light L. The optical compensation layer 190 can increase the viewing angle of the head-mounted display device 400 to the external object image L0.

In addition, the angle at which the optical compensation layer 190 deflects part of the ambient light L toward the projection target E1 is, for example, between 0 degrees and 10 degrees, but the present invention is not limited thereto.

The present invention does not limit the implementation of the optical compensation layer 190, as long as it has a structure that can deflect the edge ambient light toward the projection target E1. An embodiment of the optical compensation layer 190 may be that the optical compensation layer 190 includes a liquid crystal layer (not shown) and a driver (not shown). The driver provides the driving voltage according to the command signal DS The liquid crystal layer is adjusted so that part of the ambient light L is refracted by the liquid crystal layer to deflect toward the projection target E1. The function and principle of this embodiment are similar to those of the optical conversion layer 150 a shown in FIG. 2, and will not be repeated here.

Another implementation manner of the optical compensation layer 190 may be that the optical compensation layer 190 includes at least one chirp (not shown) and an actuator (not shown), and the actuator is coupled to the chirp. The actuator receives the command signal DS and adjusts the rotation angle of 稜鏡 according to the command signal DS, so that part of the ambient light L is refracted by 稜鏡 to deflect toward the projection target E1. The function and principle of this embodiment are similar to those of the optical conversion layer 150b shown in FIG. 3, and will not be repeated here.

Please refer to FIG. 7, which is a schematic diagram of a head-mounted display device according to another embodiment of the present invention. The head-mounted display device 500 includes optical waveguide elements 110 and 110L, light transmitting elements 120 and 120L, image devices 130 and 130L, a processor 140, optical conversion layers 150 and 150L, and optical layers 180 and 180L. The optical conversion layer 150 includes conversion layers 150-1 and 150-2, and the optical conversion layer 150L includes conversion layers 150-1L and 150-2L. The projection targets E1 and E2 can be two eyes of the user, and the processor 140 is coupled to the image devices 130 and 130L. The optical waveguide element 110, the imaging device 130, and the optical conversion layer 150 can project a projection image (not shown) to the projection target E1, and the optical waveguide element 110L, the imaging device 130L, and the optical conversion layer 150L can project a projection image (not shown) to Project the target E2 to achieve the purpose of improving the viewing angle of the augmented reality image. The functions and effects of the optical waveguide elements 110 and 110L, the imaging devices 130 and 130L, and the optical conversion layers 150 and 150L are the same as those of the head-mounted display device 100 shown in FIG. 1, and are not repeated here.

The optical layers 180 and 180L may be the optical shielding layer of the embodiment shown in FIG. 5, or the optical compensation layer of the embodiment shown in FIG. 6, or may be a combination of the optical shielding layer and the optical compensation layer. For restrictions. The light-transmitting elements 120 and 120L may be light-transmissive optical elements disposed in front of the optical waveguide elements 110 and 110L. The material of the light-transmitting elements 120 and 120L is, for example, at least one of glass or plastic, but the present invention is not limited thereto. The light-transmitting elements 120 and 120L may also be other appropriate transparent materials.

Please refer to FIG. 8 below, which illustrates a flowchart of an image projection method according to an embodiment of the present invention. The steps of the image projection method include: in step S810, providing an optical waveguide element to receive the image beam, and projecting the image through the surface. Next, in step S820, a command signal is generated according to the position of the projection target. In step S830, the optical conversion layer is disposed so as to overlap with the edge of the surface. And in step S840, the optical conversion layer deflects the projection image of the part according to the command signal to generate an adjusted projection image, so that the adjusted projection image is transmitted to the projection target.

Regarding multiple implementation details of the above steps, detailed descriptions are given in the foregoing multiple embodiments and implementation manners, which will not be elaborated below.

In summary, the head-mounted display device and the image projection method according to the embodiments of the present invention provide an optical conversion layer on the optical waveguide element to deflect the edge of the projection image that could not be transmitted to the projection target toward the projection target to transmit Projection target. The purpose of improving the viewing angle of the head-mounted display device can make users feel realistic and immersed in it.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Inventions, anyone with ordinary knowledge in the technical field to which they belong can make minor changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be defined by the scope of the attached patent application as follows: quasi.

Claims (24)

A head-mounted display device includes: an optical waveguide element that receives an image beam and projects a projection image through a surface of the optical waveguide element; an image device for providing the image beam; an optical conversion layer; and The edges of the surface of the optical waveguide element are arranged overlapping, and the optical conversion layer deflects the projection image of a portion of the command signal to generate an adjusted projection image so that the adjusted projection image is transmitted to a projection target; and A processor coupled to the optical conversion layer and generating the command signal according to the position of the projection target, wherein the optical conversion layer includes: at least one frame, which is arranged overlapping with the edge of the surface of the optical waveguide element; A device that is coupled to the at least one frame and receives the command signal to adjust the rotation angle of the at least one frame according to the command signal. The head-mounted display device according to item 1 of the scope of patent application, further comprising: a projection target detector coupled to the processor, detecting the position of the projection target to generate a detection result, wherein the processing The receiver receives the detection result to generate the command signal. According to the head-mounted display device described in the second item of the patent application scope, the projection target detector is an eye sight detector. The head-mounted display device according to item 1 of the scope of patent application, wherein an ambient light enters the optical waveguide element, passes through the optical conversion layer, and is transmitted to the projection target. The head-mounted display device according to item 4 of the scope of patent application, further comprising: an optical shielding layer, the optical shielding layer is located on the transmission path of the ambient light, the optical shielding layer includes a plurality of light shielding components, and the processing The device controls the optical shielding layer so that part of the light shielding components blocks part of the ambient light incident on the optical waveguide element. The head-mounted display device according to item 5 of the scope of patent application, wherein each of the light shielding components includes a liquid crystal layer, and the processor controls the liquid crystal layer to shield a part of the ambient light passing through the light shielding component. The head-mounted display device according to item 4 of the scope of patent application, further comprising an optical compensation layer disposed on the transmission path of the ambient light. The optical compensation layer receives an image of an external object and directs the image of the external object toward The projection target projects. The head-mounted display device according to item 1 of the scope of patent application, wherein the optical waveguide element is at least one of a scattering waveguide element, a holographic waveguide element, a polarized waveguide element, or a reflective waveguide element. A head-mounted display device includes: an optical waveguide element that receives an image beam and projects a projection image through a surface of the optical waveguide element; an image device for providing the image beam; an optical conversion layer; and The edges of the surface of the optical waveguide element are arranged overlapping, and the optical conversion layer deflects the projection image of a portion of the command signal to generate an adjusted projection image so that the adjusted projection image is transmitted to a projection target; and A processor coupled to the optical conversion layer to generate the command signal according to the position of the projection target, wherein the optical conversion layer includes: a liquid crystal layer, which is arranged to overlap the edge of the surface of the optical waveguide element; and a driver , Is coupled to the liquid crystal layer, and provides a driving voltage to adjust the liquid crystal layer according to the command signal. The head-mounted display device according to item 9 of the scope of patent application, further comprising: a projection target detector, coupled to the processor, detecting the position of the projection target to generate a detection result, wherein the processing The receiver receives the detection result to generate the command signal. According to the head-mounted display device described in item 10 of the patent application scope, the projection target detector is an eyeball sight detector. According to the head-mounted display device according to item 9 of the scope of the patent application, after an ambient light enters the optical waveguide element, it passes through the optical conversion layer and is transmitted to the projection target. The head-mounted display device according to item 12 of the scope of patent application, further comprising: an optical shielding layer, the optical shielding layer is located on the transmission path of the ambient light, the optical shielding layer includes a plurality of light shielding components, and the processing The device controls the optical shielding layer so that part of the light shielding components blocks part of the ambient light incident on the optical waveguide element. The head-mounted display device according to item 13 of the patent application, wherein each of the light shielding components includes a liquid crystal layer, and the processor controls the liquid crystal layer to shield a part of the ambient light passing through the light shielding component. The head-mounted display device according to item 12 of the scope of patent application, further comprising an optical compensation layer disposed on the transmission path of the ambient light. The optical compensation layer receives an image of an external object and directs the image of the external object toward The projection target projects. The head-mounted display device according to item 9 of the scope of patent application, wherein the optical waveguide element is at least one of a scattering waveguide element, an omnidirectional waveguide element, a polarized waveguide element, or a reflective waveguide element. An image projection method includes: providing an optical waveguide element to receive an image beam, and projecting a projection image through a surface of the optical waveguide element; generating a command signal according to a position of a projection target; and configuring an optical conversion layer And arranged overlapping with the edge of the surface of the optical waveguide element, so that the optical conversion layer deflects the projection image of the part according to the command signal so as to generate an adjusted projection image, so that the adjusted projection image is transmitted to the projection target , Wherein the optical conversion layer includes: at least one frame, which is arranged to overlap with the edge of the surface of the optical waveguide element; and an actuator, which is coupled to the at least one frame, and receives the command signal, and according to the command signal, Adjust the rotation angle of the at least one pinch. The image projection method according to item 17 of the scope of patent application, further comprising: providing a projection target detector to detect the position of the projection target to generate a detection result; and generating the command signal according to the detection result. . The image projection method according to item 17 of the scope of patent application, further comprising: providing an optical shielding layer disposed on the transmission path of the ambient light, so that the optical shielding layer blocks a portion of the ambient light incident on the optical waveguide element from the ambient light. The image projection method according to item 17 of the scope of patent application, further comprising: providing an optical compensation layer to be disposed on the transmission path of the ambient light, the optical compensation layer receiving an image of an external object, and directing the image of the external object toward The projection target projects. An image projection method includes: providing an optical waveguide element to receive an image beam, and projecting a projection image through a surface of the optical waveguide element; generating a command signal according to a position of a projection target; and configuring an optical conversion layer And arranged overlapping with the edge of the surface of the optical waveguide element, so that the optical conversion layer deflects the projection image of the part according to the command signal so as to generate an adjusted projection image, so that the adjusted projection image is transmitted to the projection target Wherein, the optical conversion layer includes: a liquid crystal layer overlapping with the edge of the surface of the optical waveguide element; and a driver coupled to the liquid crystal layer and adjusting the liquid crystal layer according to the command signal to provide a driving voltage . The image projection method according to item 21 of the patent application scope further includes: providing a projection target detector to detect the position of the projection target to generate a detection result; and generating the command signal according to the detection result. . The image projection method according to item 21 of the scope of patent application, further comprising: providing an optical shielding layer disposed on the transmission path of the ambient light, so that the optical shielding layer blocks a portion of the ambient light entering the optical waveguide element from the ambient light. The image projection method according to item 21 of the scope of patent application, further comprising: providing an optical compensation layer to be disposed on the transmission path of the ambient light, the optical compensation layer receiving an image of an external object, and directing the image of the external object toward The projection target projects.