TW202131052A - Head up display system and display method of head up display system - Google Patents

Abstract

A head up display system is provided and includes an image source, an image adjustment device, a controller, and a reflector. The image source is adapted to output an image with an image light traveling in a light path. The image adjustment device is positioned on the light path of the image light, wherein the image adjustment device comprises a liquid crystal panel. The controller is adapted to control the image adjustment device. The reflector is adapted to reflect the image light passing through the image adjustment device to a projection screen. A display method of a head up display system is also provided in the disclosure.

Description

Head-up display system and display method of the head-up display system

The present invention relates to a display technology, and particularly relates to a head-up display system and a display method thereof.

In recent years, it has been used to project light onto the windshield of vehicles such as cars, trains, ships, construction machinery, airplanes or agricultural machinery, or to display on a combiner set near the windshield as a screen The image head-up display (HUD) is well known. The HUD reflects the image on the windshield or the like to display information in the driver's field of view. The image projected on the windshield may require different imaging distances. In this way, some information in the projected image can be integrated into the actual environment and presented as a far image. Some information will be presented as a near image. This allows the driver to confirm route guidance, emergency information, vehicle status, etc., without drastically changing the line of sight.

The invention relates to a head-up display system, which can dynamically adjust the imaging conditions of an image.

The invention relates to a display method of a head-up display system, which can be used to dynamically adjust the imaging conditions of an image.

In some embodiments of the present invention, the head-up display system includes an image source, an image adjustment device, a controller, and a reflector. The image source is used to output the image of the image light propagating on the optical path. The image adjusting device is located on the optical path of the image light, and the image adjusting device includes a liquid crystal panel. The controller is used to control the image adjustment device. The reflector is used to reflect the image light passing through the image adjusting device to the projection screen.

In some embodiments of the present invention, the liquid crystal panel includes a first electrode, a second electrode, and a liquid crystal layer disposed between the first electrode and the second electrode.

In some embodiments of the present invention, each of the first electrode and the second electrode completely and continuously covers the active area of the liquid crystal panel.

In some embodiments of the present invention, the image adjustment device further includes a second liquid crystal panel located on the optical path.

In some embodiments of the present invention, the liquid crystal panel is a phase retarder, the second liquid crystal panel is a liquid crystal lens, and the second liquid crystal panel is located between the liquid crystal panel and the image source.

In some embodiments of the present invention, the second liquid crystal panel includes a first electrode, a second electrode, and a liquid crystal layer disposed between the first electrode and the second electrode, and one or both of the first electrode and the second electrode Are patterned into pixels.

In some embodiments of the present invention, the controller controls the liquid crystal panel and the second liquid crystal panel to operate independently.

In some embodiments of the present invention, one or both of the liquid crystal panel and the second liquid crystal panel include electrodes patterned in irregular patterns.

In some embodiments of the present invention, one of the liquid crystal panel and the second liquid crystal panel is located at the first focal plane of the image source, and the other of the liquid crystal panel and the second liquid crystal panel is located at the second focal plane of the image source. flat.

In some embodiments of the present invention, the image source includes a display panel and a light source that provides initial light to the display panel.

In some embodiments of the present invention, the display panel includes a silicon-based liquid crystal spatial light modulator.

In some embodiments of the present invention, the source includes a laser light source, an LED light source, or a combination thereof.

In some embodiments of the invention, the reflector includes a concave mirror.

In some embodiments of the present invention, the display method of the lift-up display system includes the following steps, but is not limited thereto. The image provided by the image source. The image light of the image is adjusted by an image adjusting device including a liquid crystal panel. The image light passing through the image adjusting device is reflected to the projection screen.

In some embodiments of the present invention, the imaging position of the image is adjusted by the image adjustment device.

In some embodiments of the present invention, the size of the image is adjusted by the image adjusting device.

In an embodiment of the present invention, the image adjusting device includes a first liquid crystal panel and a second liquid crystal panel, the first liquid crystal panel is located at the first focal plane of the image source, and the second liquid crystal panel is located at the second focal plane of the image source. On the focal plane, and the first liquid crystal panel and the second liquid crystal panel operate in different time series in a diffusion mode.

Based on the above, the head-up display system according to the embodiment of the present invention includes an image adjustment device, and the image adjustment device includes at least one liquid crystal display panel capable of dynamically adjusting the imaging conditions of an image. Therefore, the imaging distance of the image generated by the head-up display system can be adjusted to achieve multiple image distances. In addition, the image adjustment device is an electrical control device, which can realize multi-level adjustment for imaging conditions, so that the head-up display system can generate various images based on different situations.

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

FIG. 1 is a schematic diagram of the application of a head-up display system according to some embodiments of the present invention. Please refer to FIG. 1, the head-up display system 100 is, for example, configured on a car 2, and FIG. 1 only shows a part of the car 2. The head-up display system 100 can generate an image projected on the windshield 4 of the car 2. Specifically, the image light 6 of the image projected on the windshield 4 can create a virtual image 8 for the user 10 (ie, the driver) to observe. In this embodiment, the imaging distance D8 of the virtual image 8 observed by the user 10 can be adjusted through the head-up display system 100. If the virtual image 8 contains information suitable for being incorporated into the environment seen by the user 10, the imaging distance D8 of the virtual image 8 can be adjusted to be relatively large to serve as a distant image. If the virtual image 8 contains information related to the state of the vehicle, such as speedometer, tachometer, odometer, engine coolant temperature gauge, fuel gauge , Turn indicators, gearshift position indicator, seat belt warning light, parking-brake warning light, engine-malfunction lights), etc. or any combination thereof, the imaging distance D8 of the virtual image 8 can be adjusted to a relatively small near image. Therefore, the head-up display system 100 can provide the user 10 with intuitive visual effects when the user 10 does not change the line of sight significantly.

Fig. 2 is a schematic diagram of a head-up display system according to some embodiments of the present invention. Please refer to FIG. 2, the head-up display system 100A can be used as an exemplary example of the head-up display system 100 shown in FIG. 1, but the present invention is not limited to this. The head-up display system 100A may include an image source 110, an image adjustment device 120A, a controller 130A, and a reflector 140. The image source 110 may generate an image of image light to propagate in the optical path P1. The image adjustment device 120A may be arranged on the optical path P1. The controller 130A may be in electrical communication with the image adjustment device 120A, and used to control the operation of the image adjustment device 120A. The reflector 140 may be located downstream of the image adjustment device 120A on the optical path P1. The image light generated by the image source 110 may be adjusted by the image adjusting device 120A, and continuously travel along the optical path P1 until it is reflected by the reflector 140. The reflector 140 can reflect the image light passing through the image adjustment device 120A to spread in another light path P2, and illuminate the projection screen 150 such as the windshield 4 of the car 2 as shown in FIG. Generate a virtual image VI that the user's eyes UE can observe.

The image source 110 may include a display panel 112 and a light source 114. The light source 114 may include a light emitting element 114A and an optical member 114B located between the light emitting element 114A and the display panel 112. The light emitting element 114A may include a laser, an LED, etc., or a combination thereof to generate the initial light supplied to the display panel 112. The optical member 114B may include a lens, a beam splitter, a polarizer, etc., or a combination thereof, to collimate or modify the initial light generated by the light-emitting element 114A, so that The initial light can be irradiated on the display panel 112 with the required intensity, the required color temperature, or other required methods. The display panel 112 may generate an intermediate image by the initial light provided by the light source 114. Specifically, the display panel 112 may transfer the initial light into image light propagating in the optical path P1, and generate an intermediate image at a designated position. The display panel 112 may be a reflective type display panel, and may include a liquid crystal on silicon-spatial light modulator (LCoS-SLM). In some alternative examples, the display panel 112 may be other types of display panels, such as transmissive type display panels or similar panels. In some embodiments, the image source 110 may include a self-illumination display panel, such as an organic light emitting display panel or the like, so that the image source 110 may not include the light source 114.

The image adjusting device 120A may be an optical device for adjusting the condition of the image light provided by the image source 110. In some embodiments, the image adjustment device 120A may include a liquid crystal panel LCP1. For example, the liquid crystal panel LCP1 may include a first substrate SUA1, a second substrate SUB1 opposite to the first substrate SUA1, a first electrode EA1 disposed on the first substrate SUA1, a second electrode disposed on the second substrate SUB1 EB1 and the liquid crystal layer LC1 between the first electrode EA1 and the second electrode EB1. The first electrode EA1 and the second electrode EB1 may respectively completely and continuously cover the active area of the liquid crystal panel LCP1, wherein the active area of the liquid crystal panel LCP1 allows the image light generated by the image source 110 to pass through. The liquid crystal panel LCP1 has continuous and unpatterned electrodes in the active area, which can act as a phase retarder to change the polarization state of light passing through it. That is, the image light from the image source 110 can pass through the liquid crystal panel LCP1 and change the polarization state.

The controller 130A may be in electrical communication with the image adjustment device 112A. The controller 130A can input respective voltages to the first electrode EA1 and the second electrode EB1 of the liquid crystal panel LCP1, so that the liquid crystal panel LCP1 provides the required optical effects, such as the wave of the image light provided by the image source 110. Phase delay. In addition, since the liquid crystal panel LCP1 is electronically controllable, the optical effects provided by the liquid crystal panel LCP1 can be stepless controlled. In some embodiments, the controller 130A may also electrically communicate to the image source 110 or a controller (not shown) of the image source 110, and may control the image based on the information of the intermediate image generated by the image source 110. The operation of the image adjustment device 120A.

The reflector 140 may be used to reflect the image light toward the projection screen 150 after the image light passes through the image adjustment device 120A. The image light provided by the image source 110 initially propagates in the optical path P1, and may be reflected by the reflector 140 to propagate in the optical path P2. The image light propagating in the optical path P2 may be projected on the projection screen 150 to create a virtual image VI observed by the user's eyes UE. In some embodiments, the reflector 140 may be a concave mirror. The curvature of the concave mirror can determine the imaging distance ID of the virtual image VI. The greater the curvature of the concave mirror, the farther the imaging distance ID is. In some embodiments, the concave mirror may have an unfixed curvature, so that the reflection effect of the reflector 140 may be suitable for various curvatures of the projection screen 150.

In the head-up display system 100A, the image source 110 can provide image light propagating in the optical path P1 to generate an intermediate image on a predetermined focal plane, and the image light can be reflected by the reflector 140 and irradiated on the projection screen 150 , To generate a virtual image VI observed by the user's eyes UE. In some cases, the image adjustment device 120A can be controlled to be in a transparent state without providing an optical adjustment function, so that the intermediate image can be located on a predetermined focal plane, and the virtual image VI can have the first state of imaging distance ID . In some alternative examples, the image adjusting device 120A may be controlled to function as a phase retarder, and the image adjusting device 120A may change the phase delay of the image light provided by the image source 110. In this way, the imaging position of the intermediate image can be adjusted and the imaging distance ID of the virtual image VI can be changed accordingly. For example, the virtual image VI may have a second state of the imaging distance ID, and the imaging distance ID in the second state is different from the imaging distance ID in the first state. Accordingly, therefore, the image adjusting device 120A can adjust the image light to realize various imaging distance IDs of the virtual image VI, so as to enhance the flexibility of actual use.

In this embodiment, the imaging distance ID can be adjusted based on the information to be presented in the virtual image VI. For example, the route guidance information can be presented in the virtual image VI with a relatively large imaging distance ID, and information such as speedometer, tachometer, odometer, engine coolant thermometer, fuel gauge, etc. can be used to The relatively small imaging distance ID is presented in the virtual image VI. In some cases, the virtual image VI with a larger imaging distance ID can be merged into the environment seen by the user’s eyes UE, and the virtual image VI with a shorter imaging distance ID can be used as a presentation in the projection The image on the screen 150 is observed, but the present invention is not limited to this. In addition, the image adjustment device 120A can steplessly adjust the imaging result of the virtual image VI, so that the head-up display system 100A can provide ideal display effects on various projection screens (for example, windshields with various curvatures and inclinations). In other words, the application of the head-up display system 100A can be more flexible, and is not limited to the prescribed type of the juxtaposed projection screen 150.

Fig. 3 is a schematic diagram of a head-up display system according to some embodiments of the present invention. Please refer to FIG. 3, the head-up display system 100B can be used as an exemplary example of the head-up display system 100 shown in FIG. 1, but the present invention is not limited to this. Similar to the head-up display system 100A shown in FIG. 2, the head-up display system 100B includes an image source 110, an image adjustment device 120B, a controller 130B, and a reflector 140, and is suitable for projecting image light onto the projection screen 150. Create a virtual image VI that can be observed by the user's eyes UE. In the two embodiments shown in FIG. 2 and FIG. 3, the same or similar elements are represented by the same or similar reference symbols. For example, the image source 110, the reflector 140, and the projection screen 150 are the same as those described in FIG.

In this embodiment, the image adjusting device 120B may include a liquid crystal panel LCP1 between the image source 110 and the reflector 140, and a liquid crystal panel LCP2 between the liquid crystal panel LCP1 and the image source 110. The controller 130B electrically communicates with both the liquid crystal panel LCP1 and the liquid crystal panel LCP2, and is used to control the operations of the liquid crystal panel LCP1 and the liquid crystal panel LCP2. The liquid crystal panel LCP1 and the liquid crystal panel LCP2 are both located on the optical path P1 of the image light provided by the image source 110 and between the image source 110 and the reflector 140.

The liquid crystal panel LCP1 may be electronically controllable and provide an optical function as a phase retarder to adjust the polarization of the wave of the image light provided by the image source 110. The liquid crystal panel LCP1 may have a structure and function similar to the liquid crystal panel LCP1 shown in FIG. 2. The liquid crystal panel LCP2 can also be electronically controllable and can be used as a liquid crystal lens. Specifically, the liquid crystal panel LCP2 may include a first substrate SUA2, a second substrate SUB2 opposite to the first substrate SUA2, a first electrode EA2 provided on the first substrate SUA2, a second electrode provided on the second substrate SUB2 EB2 and the liquid crystal layer LC2 located between the first electrode EA2 and the second electrode EB2. In this embodiment, the first electrode EA2 and the second electrode EB2 are patterned into pixels to realize the function of a liquid crystal lens.

The image light provided by the image source 110 can propagate in the light path P1, sequentially pass through the liquid crystal panel LCP2 and the liquid crystal panel LCP1, and be reflected by the reflector 140 to illuminate the projection screen 150, creating a view that can be observed by the user's eyes UE. To the virtual image VI. The liquid crystal panel LCP2 can be controlled by the controller 130B and can adjust the focal length of the image light provided by the image source 110, thereby adjusting the size and/or imaging position of the intermediate image generated by the image source 110, and can change the virtual image accordingly. Like VI size and/or imaging distance ID. The liquid crystal panel LCP1 can be controlled by the controller 130B to change the polarization of the image light passing through the liquid crystal panel LCP1, so that the imaging distance ID of the virtual image VI can be further adjusted by the liquid crystal panel LCP1.

Through the operation and control of the liquid crystal panel LCP1 and the liquid crystal panel LCP2, the size, imaging distance, or both of the virtual image VI can be adjusted based on the information presented in the virtual image VI. In some embodiments, the liquid crystal panel LCP1 and the liquid crystal panel LCP2 can operate independently, and provide corresponding optical adjustment functions in a stepless manner. For example, the controller 130B may control the liquid crystal panel LCP2 to operate the convex/concave lens function, and at the same time control the liquid crystal panel LCP1 to present a transparent state without the phase retardation function. Alternatively, the controller 130B may control the liquid crystal panel LCP1 to present a phase retardation function, and at the same time control the liquid crystal panel LCP2 to present a transparent state without the convex/concave lens function. In another embodiment, the controller 130B may control the liquid crystal panel LCP1 to exhibit a phase retardation function, and may also control the liquid crystal panel LCP2 to operate a convex/concave lens function. Therefore, the virtual image VI can be created under various imaging conditions. In some embodiments not shown, the image adjustment device may include a liquid crystal panel LCP2 without the liquid crystal panel LCP1, and may achieve the effect of creating a virtual image VI under various imaging conditions.

Fig. 4 is a schematic diagram of a head-up display system according to some embodiments of the present invention. Please refer to FIG. 4, the head-up display system 100C can be used as an exemplary example of the head-up display system 100 shown in FIG. 1, but the present invention is not limited to this. Similar to the head-up display system 100A shown in FIG. 2, the head-up display system 100C includes an image source 110, an image adjustment device 120C, a controller 130C, and a reflector 140, and is suitable for projecting image light onto the projection screen 150. Create a virtual image VI that can be observed by the user's eyes UE. In the two embodiments shown in FIG. 2 and FIG. 4, the same or similar elements are represented by the same or similar reference signs. For example, the image source 110, the reflector 140, and the projection screen 150 are the same as those described in FIG.

In this embodiment, the image adjustment device 120C may include a liquid crystal panel LCP3 between the image source 110 and the reflector 140, and a liquid crystal panel LCP4 between the liquid crystal panel LCP3 and the reflector 140. The controller 130C is in electrical communication with both the liquid crystal panel LCP3 and the liquid crystal panel LCP4 to control the operations of the liquid crystal panel LCP3 and the liquid crystal panel LCP4. Both the liquid crystal panel LCP3 and the liquid crystal panel LCP4 are located on the optical path P1 of the image light provided by the image source 110.

In this embodiment, the liquid crystal panel LCP3 may be electronically controllable, and may include a first substrate SUA3, a second substrate SUB3 opposite to the first substrate SUA3, a first electrode EA3 provided on the first substrate SUA3, The second electrode EB3 on the second substrate SUB3 and the liquid crystal layer LC3 between the first electrode EA3 and the second electrode EB3. In this embodiment, the first electrode EA3 and the second electrode EB3 are patterned into irregular patterns, although FIG. 4 does not show irregular patterns for illustration. The liquid crystal panel LCP3 can be used as an electronically controllable diffuser, and is controlled by the controller 130C to operate the required optical functions.

The liquid crystal panel LCP4 may have a structure similar to that of the liquid crystal panel LCP3. Specifically, the liquid crystal panel LCP4 may include a first substrate SUA4, a second substrate SUB4 opposite to the first substrate SUA4, a first electrode EA4 provided on the first substrate SUA4, and a second electrode provided on the second substrate SUB4 EB4 and the liquid crystal layer LC4 between the first electrode EA4 and the second electrode EB4. Although FIG. 4 does not show irregular patterns for illustration, in this embodiment, the first electrode EA4 and the second electrode EB4 are patterned into irregular patterns. The liquid crystal panel LCP4 can be used as an electronically controllable diffuser, and is controlled by the controller 130C to operate the required optical functions.

The image source 110 may generate intermediate images on multiple focal planes, and may determine the imaging distance ID of the virtual image VI based on the position of the intermediate image. In this embodiment, the liquid crystal panel LCP3 is located at the first focal plane of the image source 110, and the liquid crystal panel LCP4 is located at the second focal plane of the image source 110. When the image source 110 generates an intermediate image at the first focal plane, a virtual image VI may be created in the first state of the imaging distance ID. In addition, the controller 130C may control the liquid crystal panel LCP3 to operate the diffuser function, and control the liquid crystal panel LCP4 to present a transparent state without a diffusion effect. In this way, compared with the condition that both the liquid crystal panel LCP3 and the liquid crystal panel LCP4 exist in a transparent state, the virtual image VI created in the first state of the imaging distance ID can be enlarged. Similarly, when the image source 110 generates an intermediate image at the second focal plane, the virtual image VI may be created in the second state of the imaging distance ID. In addition, the controller 130C may control the liquid crystal panel LCP4 to operate the diffuser function, and control the liquid crystal panel LCP3 to present a transparent state without a diffusing effect. In this way, compared with the condition that both the liquid crystal panel LCP3 and the liquid crystal panel LCP4 exist in a transparent state, the virtual image VI created in the second state of the imaging distance ID can be enlarged. In some embodiments, the intermediate image generated based on the image source cannot simultaneously present the diffuser function, and the liquid crystal panel LCP3 and the liquid crystal panel LCP4 can operate the diffuser function. In other words, the liquid crystal panel LCP3 and the liquid crystal panel LCP4 operate in different time series in the diffusion mode. In some embodiments, the image source 110 may generate intermediate images on more focal planes, and the image adjustment device 120C may include more liquid crystal panels, and these liquid crystal panels are located at various focal planes of the image source 110. Based on the above embodiment, one or more of the liquid crystal panels LCP1 to LCP4 may be disposed between the image source 110 and the reflector 140, and the imaging conditions of the virtual image VI are adjusted to enhance the flexibility of the imaging effect.

In summary, the head-up display system according to some embodiments of the present invention includes an image adjustment device capable of adjusting the imaging distance and/or the size of the virtual image created, so that the head-up display system has various imaging effects to enhance actual use. flexibility.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to those defined by the attached patent application scope.

2: car 4: Windshield 6: image light 8. VI: virtual image 10: User D8, ID: imaging distance 100, 100A, 100B, 100C: head-up display system 110: Image source 112: display panel 114: light source 114A: Light-emitting element 114B: Optical components 120A, 120B, 100C: image adjustment device 130A, 130B, 130C: Controller 140: reflector 150: Projection screen P1, P2: light path LCP1, LCP2, LCP3, LCP4: LCD panel SUA1, SUA2, SUA3, SUA4: the first substrate SUB1, SUB2, SUB3, SUB4: second substrate EA1, EA2, EA3, EA4: first electrode EB1, EB2, EB3, EB4: second electrode LC1, LC2, LC3, LC4: liquid crystal layer UE: User's eyes

The accompanying drawings are included to provide a further understanding of the present invention, and the accompanying drawings are incorporated into this specification and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present invention, and together with the description serve to explain the principle of the present invention. FIG. 1 is a schematic diagram of the application of a head-up display system according to some embodiments of the present invention. Fig. 2 is a schematic diagram of a head-up display system according to some embodiments of the present invention. Fig. 3 is a schematic diagram of a head-up display system according to some embodiments of the present invention. Fig. 4 is a schematic diagram of a head-up display system according to some embodiments of the present invention.

VI: virtual image

ID: imaging distance

100A: Head-up display system

110: Image source

112: display panel

114: light source

114A: Light-emitting element

114B: Optical components

120A: Image adjustment device

130A: Controller

140: reflector

150: Projection screen

P1, P2: light path

LCP1: LCD panel

SUA1: the first substrate

SUB1: Second substrate

EA1: First electrode

EB1: second electrode

LC1: Liquid crystal layer

UE: User's eyes

Claims (17)

A head-up display system, including: The image source is used to output the intermediate image of the image light propagating on the optical path; An image adjustment device arranged on the optical path of the image light, wherein the image adjustment device includes a liquid crystal panel; A controller for controlling the image adjustment device; and The reflector is used to reflect the image light passing through the image adjusting device to the projection screen. The head-up display system according to claim 1, wherein the liquid crystal panel includes a first electrode, a second electrode, and a liquid crystal layer disposed between the first electrode and the second electrode. The head-up display system according to claim 1, wherein the first electrode and the second electrode respectively completely and continuously cover the active area of the liquid crystal panel. The head-up display system according to claim 1, wherein the image adjustment device further includes a second liquid crystal panel located on the optical path. The head-up display system according to claim 4, wherein the liquid crystal panel is a phase retarder, the second liquid crystal panel is a liquid crystal lens, and the second liquid crystal panel is located between the liquid crystal panel and the image source between. The head-up display system according to claim 4, wherein the second liquid crystal panel includes a first electrode, a second electrode, and a liquid crystal layer disposed between the first electrode and the second electrode, and the first electrode One or both of the one electrode and the second electrode are patterned into pixels. The head-up display system according to claim 4, wherein the controller controls the liquid crystal panel and the second liquid crystal panel to operate independently. The head-up display system according to claim 4, wherein one or both of the liquid crystal panel and the second liquid crystal panel include electrodes patterned into irregular patterns. The head-up display system according to claim 8, wherein one of the liquid crystal panel and the second liquid crystal panel is located at the first focal plane of the image source, and the liquid crystal panel and the second liquid crystal panel The other is located at the second focal plane of the image source. The head-up display system according to claim 1, wherein the image source includes a display panel and a light source that provides initial light to the display panel. The head-up display system according to claim 10, wherein the display panel includes a silicon-based liquid crystal spatial light modulator. The head-up display system according to claim 10, wherein the light source includes a laser light source, an LED light source or a combination thereof. The head-up display system according to claim 1, wherein the reflector includes a concave mirror. A display method of a head-up display system includes: Generate intermediate images from image sources; Adjusting the image light of the intermediate image by an image adjusting device, wherein the image adjusting device includes a liquid crystal panel; and The image light passing through the image adjusting device is reflected to a projection screen. The display method of the head-up display system according to claim 14, wherein the imaging position of the intermediate image is adjusted by the image adjusting device. The display method of the head-up display system according to claim 14, wherein the size of the intermediate image is adjusted by the image adjusting device. The display method of the head-up display system according to claim 14, wherein the image adjusting device includes a first liquid crystal panel and a second liquid crystal panel, and the first liquid crystal panel is located at the first focal plane of the image source The second liquid crystal panel is located at the second focal plane of the image source, and the first liquid crystal panel and the second liquid crystal panel operate in a diffusion mode in different time series.

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