Display device

Abstract

The invention relates to the technical field of display, and provides a display device which comprises a light source; an image generation unit; a scanning mirror (Scanning mirror); a reflector (Reflector); a windshield (Windshield); and a sight tracking unit. Wherein the light emitted by the light source passes through the image generation unit, is reflected by the scanning mirror, is imaged at an adjustable image position, and is reflected to the windshield by the reflector.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device, and in particular to an augmented reality head-up display (AR HUD). Background Art

[0002] Head Up Display (HUD) was first used in military aircraft. Its main principle is to project flight-related information onto a piece of glass in front of the aircraft cockpit, so that the pilot can keep his eyes level while taking into account instrument parameters and external visual references in the same field of view, thereby ensuring flight safety.

[0003] Head-up displays have also been introduced into cars by many automobile manufacturers. Car head-up displays are similar to those originally used in military aircraft. They also use the principle of optical reflection to project important driving-related information onto the windshield and reflect it into the driver's eyes in a balanced manner. The main function is to allow the driver to no longer need to look down at the dashboard and navigation. It projects driving speed, engine speed, fuel consumption, fuel volume, temperature of various vehicle devices (such as water tanks, engines, etc.), navigation routes, and other related driving information data onto the front windshield of the car.

[0004] With the continuous improvement of display technology, various car dealers or auto parts manufacturers have also developed different types of head-up displays. The earliest head-up displays were reflective head-up displays, which reflected relevant driving information directly on the windshield. Due to the requirements of brightness and clarity, the use of reflective head-up displays requires a transparent black film to be attached to the windshield. However, the image presentation range is limited, and the black film will also interfere with the driver's vision, making it easy for others to see the relevant driving information.

[0005] In recent years, head-up displays have developed into combined head-up displays (CHUD) and windshield head-up displays (WHUD). The combined head-up display is a transparent resin plate placed above the instrument panel, which uses the transparent resin plate as a projection medium to reflect the image and display relevant driving information. Its structure is similar to the head-up display of an aircraft, but the combined head-up display is prone to breakage after a collision, which may injure the driver or passengers. The windshield head-up display directly uses the front windshield as a projection medium to reflect the image, which effectively solves the safety hazard of the combined head-up display. However, due to the imaging principle, the windshield head-up display directly used on a general windshield will produce overlapping images. Therefore, for cars using windshield head-up displays, it is best to replace the front windshield with wedge-shaped glass to solve the problem of overlapping images, but the cost of wedge-shaped glass is expensive. In addition, there are augmented reality head-up displays (AR HUD) and flat augmented reality head-up displays (Flat Type AR HUD).

[0006] In related technologies, AR HUD uses a freeform mirror to project the Picture Generate Unit (PGU) onto the road in front of the driver. The virtual image distance (VID) is determined by the curvature of the freeform mirror and the distance between the freeform mirror and the PGU. In addition, in the related Computer-Generated Hologram (CGH) technology, the necessary components of CGH are the light source (laser), CGH Liquid Crystal On Silicon (LCoS) and projection magnifier (Lens). The current technical bottleneck is the small size of CGH LCoS and the high directivity of the laser, which leads to a small field of view (FOV) and eyebox, which need to be enlarged through lenses and pupil expansion elements. The current improvement method is described as follows.

[0007] Please refer to Figure 1 The augmented reality head-up display 1 includes a lens 10, a relay imaging surface 20, a scanner 30, a light source 40, and an exit pupil 60. When light 70 passes through the augmented reality head-up display 1, a field of view (FOV) is formed in front of the user's eyes 50, and a scanning angle 90 is formed in front of the scanner 30. Figure 1 As shown, one of the methods to improve the field of view (FOV) and the eyebox between the dotted lines 80 is to add an exit pupil expander to increase the eyebox (i.e., increase the viewing angle) and enlarge the imaging size of the CGH, but this architecture can only form a single imaging plane. Generally speaking, the relay imaging plane 20 acts as an exit pupil expander element in the system, which can be a diffuser or a micro lens array.

[0008] In addition, other improvement methods are to use waveguides to expand the pupil (Exit pupil expander) to increase the eyebox (Eyebox), that is, to increase the viewing area. However, this structure cannot correct the distortion caused by the windshield (curved surface), which means that only a flat windshield or a special film can be used on the windshield; if only a special film is attached to the windshield, it cannot currently adapt to vehicle specifications.

[0009] In summary, AR HUD of related technologies still has technical bottlenecks. Therefore, how to increase the eye box and enlarge the imaging size of CGH without causing other problems is an important issue that the industry needs to consider. Summary of the invention

[0010] In view of the above, an embodiment of the present application provides an augmented reality head-up display (AR HUD), which changes the distance between the free-form mirror and the PGU by switching the computer-generated hologram (CGH) PGU (hereinafter referred to as CGH PGU) imaging surface, thereby changing the projection surface distance (VID).

[0011] An embodiment of the present application provides a display device, comprising: a light source; an image generating unit; a scanning mirror; a reflector; a windshield; and a line of sight tracking unit; wherein light emitted by the light source passes through the image generating unit, is then reflected by the scanning mirror, and is formed at an adjustable image position, and is then reflected by the reflector to the windshield.

[0012] According to one or more embodiments of the present application, the image generation unit is a computer-generated holographic image generation unit.

[0013] According to one or more embodiments of the present application, the computer-generated holographic image generation unit includes an RGB laser.

[0014] According to one or more embodiments of the present application, the reflector module includes two or more reflective mirrors.

[0015] According to one or more embodiments of the present application, the reflector is a semi-transmissive reflector.

[0016] The present application further provides a display device, including:

[0017] RGB backlight module;

[0018] Image generation unit;

[0019] Scanning mirror;

[0020] Reflector module;

[0021] Windshield;

[0022] Gaze tracking unit; and

[0023] Spectral element;

[0024] The light emitted by the RGB backlight module passes through the image generation unit and then is reflected by the scanning mirror to form an image at an adjustable image position, and then is reflected by the reflector module to the windshield.

[0025] According to one or more embodiments of the present application, the image generation unit is a computer-generated holographic image generation unit.

[0026] According to one or more embodiments of the present application, the reflector module includes two or more reflective mirrors.

[0027] According to one or more embodiments of the present application, the reflector is a semi-transmissive reflector.

[0028] The present application also provides a display device, including:

[0029] RGB backlight module;

[0030] Image generation unit;

[0031] Scanning mirror;

[0032] Reflector module;

[0033] Windshield;

[0034] Gaze tracking unit; and

[0035] Spectral element;

[0036] The light emitted by the RGB backlight module passes through the image generation unit, is then reflected by the scanning mirror, and is imaged at an adjustable image position, and then is reflected by the reflector module to the windshield;

[0037] The RGB backlight module includes a red light source, a green light source and a blue light source; the light of the red light source is reflected by a first reflector and then split by a beam splitter to an image generating unit; the light of the green light source is reflected by a second reflector and then split by a beam splitter to an image generating unit; the light of the blue light source is reflected by a third reflector and then split by a beam splitter to an image generating unit.

[0038] Therefore, the display of the present application (such as an augmented reality head-up display) changes the distance between the free-form mirror and the PGU by switching the computer-generated holographic PGU imaging surface, thereby changing the projection surface distance to increase the eye box and enlarge the imaging size of the CGH without causing other problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to make the above and other purposes, features, advantages and embodiments of the present application more understandable, the attached drawings are described as follows:

[0040] Figure 1 A schematic diagram of a display device of the related art;

[0041] Figure 2 A schematic diagram of an augmented reality head-up display according to an embodiment of the present application;

[0042] Figure 3 A schematic diagram of an augmented reality head-up display according to an embodiment of the present application;

[0043] Figure 4 A schematic diagram of an augmented reality head-up display according to an embodiment of the present application;

[0044] Figure 5 FIG. 4 is a schematic diagram of an augmented reality head-up display according to an embodiment of the present application.

[0045] According to conventional working methods, various features and components in the drawings are not drawn according to actual scale, and the drawing method is to present the specific features and components related to the present application in the best way. In addition, similar components and parts are referred to by the same or similar element symbols in different drawings.

[0046] Description of reference numerals:

[0047] Augmented reality head-up display 1, lens 10, relay imaging surface 20, scanner 30, light source 40, eye 50, exit pupil 60, light 70, dotted line 80, scanning angle 90, augmented reality head-up display 100, sight tracking unit 102, scanning mirror 104, image generation unit 106, reflector 108, windshield 110, eye 112, light source 114, adjustable image position A, A', augmented reality head-up display 300, scanning mirror 302a, scanning mirror 302b, image generation unit 304a, image generation unit 304b, reflector 306a, reflector 306b, left eye 308a , right eye 308b, augmented reality head-up display 400, scanning mirror 402a, scanning mirror 402b, image generating unit 404a, image generating unit 404b, reflector 406, left eye 408a, right eye 408b, augmented reality head-up display 500, scanning mirror 502a, scanning mirror 502b, computer generated holographic unit 504a, computer generated holographic unit 504b, reflector 506, left eye 508a, right eye 508b, spectrometer 510, red light source 512a, green light source 514a, blue light source 516a, reflector 512b, reflector 514b, reflector 516b. DETAILED DESCRIPTION

[0048] The following disclosure provides different embodiments or examples to establish different features of the provided target. The specific examples of components and arrangements described below are intended to simplify the present disclosure and are not intended to be limiting; the size and shape of the components are not limited by the disclosed ranges or values, but may depend on the process conditions or required characteristics of the components. For example, cross-sectional views are used to describe the technical features of the present application, and these cross-sectional views are idealized schematic diagrams of embodiments. Therefore, it is foreseeable that the shapes shown in the figures are different due to manufacturing processes and / or tolerances, and should not be limited thereto.

[0049] Furthermore, spatially relative terms, such as "below", "under", "lower than", "above", and "higher than", are intended to facilitate description of the relationship between elements or features illustrated in the accompanying drawings; in addition, spatially relative terms include different directions of the elements when in use or operation in addition to the directions depicted in the diagrams.

[0050] First, please refer to Figure 2 , Figure 2 FIG. 1 is a schematic diagram of an augmented reality head-up display according to an embodiment of the present application. Figure 2As shown, in one embodiment of the present application, the augmented reality head-up display 100 includes: a light source 114, an image generating unit 106, a scanning mirror 104, a reflector 108, a windshield 110, and an eye tracking unit 102. In one embodiment of the present application, the light source 114 emits light through the image generating unit 106, and then reflects on the scanning mirror 104 to form an image at a tunable image position A or A', and then reflects on the windshield 110 by the reflector 108. At this time, the eyes 112 of the user (for example, a car driver) can see the imaging information on the windshield 110. In one embodiment of the present application, the function of the scanning mirror 104 is to project an image for the eye tracking unit 102 to expand the eyebox in the x direction. In addition, the reflector 108 is used to expand the pupil in the Y direction, magnify the tunable image, and correct the windshield aberration.

[0051] Also, please refer to Figure 3 , Figure 3 FIG. 1 is a schematic diagram of an augmented reality head-up display according to an embodiment of the present application. Figure 3 As shown, in another embodiment of the present application, the augmented reality head-up display 300 includes a first module ( Figure 3 Left side) and the second module ( Figure 3 The first module tracks the left eye 308a, while the second module tracks the right eye 308b. Figure 3 As shown, the first module for tracking the left eye 308a includes an image generating unit 304a, a scanning mirror 302a, and a reflector 306a; the second module for tracking the right eye 308b includes an image generating unit 304b, a scanning mirror 302b, and a reflector 306b. In another embodiment of the present application, for the first module for tracking the left eye 308a, light is emitted by the image generating unit 304a and reflected by the scanning mirror 302a, imaged at the adjustable image position A', and then reflected by the reflector 306a to the windshield (not shown). In addition, for the second module for tracking the right eye 308b, light is emitted by the image generating unit 304b and reflected by the scanning mirror 302b, imaged at the adjustable image position A, and then reflected by the reflector 306b to the windshield (not shown). Whether in the first module for tracking the left eye 308a or the second module for tracking the right eye 308b, the size of the respective reflector 306a or 306b only needs to cover the eye box of the left eye 308a or the right eye 308b.

[0052] Also, please refer to Figure 4 , Figure 4 FIG. 1 is a schematic diagram of an augmented reality head-up display according to an embodiment of the present application. Figure 4 As shown, in another embodiment of the present application, the augmented reality head-up display 400 includes a third module ( Figure 4 Left side) and the fourth module ( Figure 4 The third module tracks the left eye 408a, and the fourth module tracks the right eye 408b. Figure 4 As shown, the third module for tracking the left eye 408a includes an image generating unit 404a, a scanning mirror 402a, and a portion of a reflector 406; the fourth module for tracking the right eye 408b includes an image generating unit 404b, a scanning mirror 402b, and a portion of a reflector 406. It should be particularly noted that the third module for tracking the left eye 408a and the fourth module for tracking the right eye 408b share a reflector 406. In another embodiment of the present application, with respect to the third module for tracking the left eye 408a, light is emitted from the image generating unit 404a and reflected from the scanning mirror 402a, imaged at the adjustable image position A', and then reflected from the reflector 406 to the windshield (not shown). In addition, with respect to the fourth module for tracking the right eye 408b, light is emitted from the image generating unit 404b and reflected from the scanning mirror 402b, imaged at the adjustable image position A, and then reflected from the reflector 406 to the windshield (not shown). In either the third module for tracking the left eye 408a or the fourth module for tracking the right eye 408b, the image generating unit 404a and the image generating unit 404b share the reflector 406, so the size of the reflector 406 only needs to cover the eye boxes of the left eye 408a and the right eye 408b on the y-axis.

[0053] Also, please refer to Figure 5 , Figure 5 FIG. 1 is a schematic diagram of an augmented reality head-up display according to an embodiment of the present application. Figure 5 As shown, in another embodiment of the present application, the augmented reality head-up display 500 includes a fifth module ( Figure 5 Left side) and the sixth module ( Figure 5 The fifth module tracks the left eye 508a, and the sixth module tracks the right eye 508b. Figure 5As shown, the fifth module for tracking the left eye 508a includes a computer-generated holographic unit 504a, a scanning mirror 502a, and a portion of a reflector 506; the sixth module for tracking the right eye 508b includes a computer-generated holographic unit 504b, a scanning mirror 502b, and a portion of a reflector 506. It should be particularly noted that the fifth module for tracking the left eye 508a and the sixth module for tracking the right eye 508b share a reflector 506. In another embodiment of the present application, with respect to the fifth module for tracking the left eye 508a, light is emitted by the computer-generated holographic unit 504a and reflected by the scanning mirror 502a, imaged at an adjustable image position A', and then reflected by the reflector 506 to the windshield (not shown). In addition, with respect to the sixth module for tracking the right eye 508b, light is emitted by the computer-generated holographic unit 504b and reflected by the scanning mirror 502b, imaged at an adjustable image position A, and then reflected by the reflector 506 to the windshield (not shown). In either the fifth module for tracking the left eye 508a or the sixth module for tracking the right eye 508b, the computer-generated holographic unit 504a and the computer-generated holographic unit 504b share the reflector 506, so the size of the reflector 506 only needs to cover the eye boxes of the left eye 508a and the right eye 508b in the y-axis direction. Figure 5 As shown, the left eye 508a and the right eye 508b share the CGH, and after light splitting, each tracks the left eye 508a or the right eye 508b. Figure 5 As shown, the computer-generated holographic unit 504a and the computer-generated holographic unit 504b share the reflector 506, so the size of the reflector 506 only needs to cover the eye boxes of the left eye 508a and the right eye 508b in the y-axis direction.

[0054] It should also be noted here that Figure 5 As shown, the augmented reality head-up display 500 further includes a light splitting element 510 and an RGB backlight module. In the embodiment of the present application, the RGB backlight module includes a red light source 512a, a green light source 514a, and a blue light source 516a. Figure 5 As shown, the light of the red light source 512a is reflected by the reflector 512b and then split into the computer-generated hologram unit 504a and the computer-generated hologram unit 504b by the beam splitter 510. The light of the green light source 514a is reflected by the reflector 514b and then split into the computer-generated hologram unit 504a and the computer-generated hologram unit 504b by the beam splitter 510. The light of the blue light source 516a is reflected by the reflector 516b and then split into the computer-generated hologram unit 504a and the computer-generated hologram unit 504b by the beam splitter 510. In one embodiment of the present application, the beam splitter 510 is a grating. In another embodiment of the present application, the beam splitter 510 is a beam splitter.

[0055] Therefore, an embodiment of the present application is a display device, comprising: a light source; an image generating unit; a scanning mirror; a reflector; a windshield; and a line of sight tracking unit; wherein, the light emitted by the light source passes through the image generating unit, is then reflected by the scanning mirror, and is imaged at an adjustable image position, and is then reflected by the reflector to the windshield.

[0056] In an embodiment of the present application, the image generation unit is a computer-generated holographic image generation unit.

[0057] In an embodiment of the present application, the computer generated holographic image generation unit includes RGB laser.

[0058] In an embodiment of the present application, the reflector module includes two or more reflective mirrors.

[0059] In an embodiment of the present application, the reflector is a semi-transmissive reflector.

[0060] In addition, another embodiment of the present application provides a display device, including:

[0061] RGB backlight module;

[0062] Image generation unit;

[0063] Scanning mirror;

[0064] Reflector module;

[0065] Windshield;

[0066] Gaze tracking unit; and

[0067] Spectral element;

[0068] The light emitted by the RGB backlight module passes through the image generation unit and then is reflected by the scanning mirror to form an image at an adjustable image position, and then is reflected by the reflector module to the windshield.

[0069] In an embodiment of the present application, the image generation unit is a computer-generated holographic image generation unit.

[0070] In an embodiment of the present application, the reflector module includes two or more reflective mirrors.

[0071] In an embodiment of the present application, the reflector is a semi-transmissive reflector.

[0072] In addition, another embodiment of the present application provides a display device, including:

[0073] RGB backlight module;

[0074] Image generation unit;

[0075] Scanning mirror;

[0076] Reflector module;

[0077] Windshield;

[0078] Gaze tracking unit; and

[0079] Spectral element;

[0080] The light emitted by the RGB backlight module passes through the image generation unit, is then reflected by the scanning mirror, and is imaged at an adjustable image position, and then is reflected by the reflector module to the windshield;

[0081] Among them, the RGB backlight module includes a red light source, a green light source and a blue light source; the light of the red light source is reflected by the first reflector and then separated by the spectroscopic element to the image generation unit; the light of the green light source is reflected by the second reflector and then separated by the spectroscopic element to the image generation unit; the light of the blue light source is reflected by the third reflector and then separated by the spectroscopic element to the image generation unit.

[0082] In summary, the Augmented Reality HUD (AR HUD) of the present application changes the distance between the free-form mirror and the PGU by switching the imaging surface of the Computer-Generated Hologram (CGH) PGU (hereinafter referred to as CGH PGU), thereby changing the projection surface distance (VID) to increase the eye box and enlarge the imaging size of the CGH without causing other problems.

[0083] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A display device, characterized in that: include: light source; Image generation unit; Scanning mirror; Reflector module; windshield; as well as Gaze tracking unit; The light emitted by the light source passes through the image generating unit and then is reflected by the scanning mirror to form an image at an adjustable image position, and then is reflected by the reflector module to the windshield.

2. The display device according to claim 1, wherein: The image generation unit is a computer-generated holographic image generation unit.

3. The display device according to claim 2, wherein: The computer generated holographic image generation unit includes RGB laser.

4. The display device according to claim 1, wherein: The reflector module includes two or more reflective mirrors.

5. The display device according to claim 4, characterized in that The reflector is a semi-transmissive reflector.

6. A display device, characterized in that: include: RGB backlight module; Image generation unit; Scanning mirror; Reflector module; windshield; Gaze tracking unit; as well as Spectral element; The light emitted by the RGB backlight module passes through the image generation unit and is then reflected by the scanning mirror to be imaged at an adjustable image position, and then is reflected by the reflector module to the windshield.

7. The display device according to claim 6, characterized in that The image generation unit is a computer-generated holographic image generation unit.

8. The display device according to claim 6, wherein: The reflector module includes two or more reflective mirrors.

9. The display device according to claim 8, wherein: The reflector is a semi-transmissive reflector.

10. A display device, characterized in that: include: RGB backlight module; Image generation unit; Scanning mirror; Reflector module; windshield; Gaze tracking unit; as well as Spectral element; The light emitted by the RGB backlight module passes through the image generation unit, is then reflected by the scanning mirror, and is imaged at an adjustable image position, and is then reflected by the reflector module to the windshield; The RGB backlight module includes a red light source, a green light source and a blue light source; the light of the red light source is reflected by a first reflector and then separated by the spectroscopic element to the image generating unit; the light of the green light source is reflected by a second reflector and then separated by the spectroscopic element to the image generating unit; the light of the blue light source is reflected by a third reflector and then separated by the spectroscopic element to the image generating unit.

Images