Display device and vehicle

Abstract

The invention discloses a display device and a vehicle, the display device comprises an image module, a first light modulation module, a detection module and at least one processor, the image module comprises at least two image sources, the first light modulation module comprises at least two reflection areas, one reflection area and one image source form a corresponding group, and the at least one processor is connected with the first light modulation module. The reflecting region in each corresponding group is located on a light path of image light emitted by the image source; image light emitted by the image source is reflected by the corresponding reflection area, then is reflected by the display module and enters the observation area for imaging; the detection module is used for acquiring non-image light entering an image light path; when the sunlight flows backwards, the processor is configured to control the at least one image source to be closed when the light signal based on the non-image light exceeds a threshold value; and / or at least one reflection area is controlled to be closed so as to reduce the burn-in risk caused by sunlight backflow, prolong the service life of the image source and improve the virtual imaging effect of the display device.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of display technology, and in particular to a display device and a vehicle. Background Art

[0002] The head-up display (HUD) generates a virtual image in front of the driver of the vehicle and provides various information to the driver by displaying information in the virtual image. Usually, the field of view (FOV) of the vehicle-mounted HUD optical path is large. Since the optical path is reversible, sunlight enters the HUD display screen in the reverse direction. High-energy solar radiation will cause the risk of sunlight backflow and "screen burn", affecting the service life of the HUD display screen and reducing the imaging effect of the virtual image. Summary of the invention

[0003] The present invention provides a display device, which adopts a corresponding group of multiple image sources and multiple reflection areas. When sunlight flows back, at least one image source is controlled to be closed, or at least one reflection area is controlled to be closed, so as to avoid the risk of screen burn-in caused by sunlight flowing back to the image source, thereby extending the service life of the image source and improving the virtual imaging effect of the display device.

[0004] An embodiment of the present invention provides a display device, including:

[0005] An image module, comprising at least two image sources, wherein the image sources are used to emit image light;

[0006] A first dimming module includes at least two reflection areas, one of the reflection areas and one of the image sources form a corresponding group, and the reflection areas in each corresponding group are located on the optical path of the image light emitted by the image source;

[0007] A display module, wherein the image light emitted by the image source is reflected by the corresponding reflection area and then reflected by the display module before entering the observation area for imaging;

[0008] A detection module, used for acquiring non-image light entering the image light path;

[0009] At least one processor is configured to control at least one of the image sources to be turned off when the light signal of the non-image light exceeds a threshold; and / or control at least one of the reflection areas to be turned off.

[0010] Based on the same inventive concept, an embodiment of the present invention further provides a means of transportation, comprising the display device provided in the first aspect.

[0011] The display device provided by the embodiment of the present invention sets a reflection area separately on the optical path of the image light emitted by each image source, and the processor detects the non-image light on the reverse optical path of each image light based on the detection module, and compares the optical signal of the non-image light fed back by the detection module with the threshold value. When the optical signal exceeds the threshold value, that is, when the sunlight backflow is strong, at least one image source is controlled to be turned off to reduce the heat generated by the image source itself and extend the service life of the image source. Alternatively, at least one reflection area is controlled to be turned off to block the optical path of the sunlight backflowing to the image source, thereby reducing the risk of screen burn-in caused by the energy radiation of external light to the image source and improving the virtual imaging effect of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a vehicle-mounted HUD provided by the prior art;

[0013] Figure 2 is a structural schematic diagram of a display device provided by an embodiment of the present invention;

[0014] Figure 3 yes Figure 2 A schematic diagram of an optical path of a display device provided in which a first image source is turned off;

[0015] Figure 4 yes Figure 2 A schematic diagram of an optical path in which a second image source of a display device is turned off is provided;

[0016] Figure 5 yes Figure 2 A schematic diagram of a light path in which a first reflective area of ​​a display device is closed is provided;

[0017] Figure 6 yes Figure 2 A schematic diagram of a light path in which the second reflective area of ​​a display device is closed is provided;

[0018] Figure 7 is a schematic structural diagram of another display device provided by an embodiment of the present invention;

[0019] Figure 8 yes Figure 7 A schematic diagram of an optical path of a display device provided in which a first image source is turned off;

[0020] Fig. 9 yes Figure 7 A schematic diagram of a light path in which a first reflective area of ​​a display device is closed is provided;

[0021] Fig.10 yes Figure 7 A schematic diagram of a light path in which a first reflective area of ​​a display device is closed is provided;

[0022] Fig.11 yes Figure 8 A schematic diagram of an optical path in which a second image source of a display device is turned off is provided;

[0023] Fig.12 yes Figure 7 A schematic diagram of a light path in which the second reflective area of ​​a display device is closed is provided;

[0024] Fig.13 yes Figure 7 A schematic diagram of a light path in which the second reflective area of ​​a display device is closed is provided;

[0025] Fig.14 is a schematic diagram of dividing the viewing angle of a display device provided by an embodiment of the present invention;

[0026] Fig.15 is a schematic structural diagram of another display device provided by an embodiment of the present invention;

[0027] Fig.16 It is a schematic diagram of a display device provided by an embodiment of the present invention applied in a vehicle. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] Figure 1 This is a structural diagram of a vehicle-mounted HUD provided by the prior art. Figure 1 In the prior art, in vehicle-mounted HUD applications, the vehicle-mounted HUD is usually composed of an image source 10, at least one free-form surface mirror 11 and a windshield 12. The image light S emitted by the image source 10 is reflected by the free-form surface mirror 11 and the windshield 12 to generate a virtual image M in front of the driver. The large-sized free-form surface mirror 11 may have the risk of "screen burn-in" due to the sunlight convergence effect.

[0030] Based on one or more of the above technical problems, an embodiment of the present invention provides a display device including an image module, a first dimming module, a display module, a detection module and at least one processor. The image module includes at least two image sources, and the image source is used to emit image light. The first dimming module includes at least two reflection areas, and a reflection area and an image source form a corresponding group, and the reflection area in each corresponding group is located on the optical path of the image light emitted by the image source. The image light emitted by the image source is reflected by its corresponding reflection area and then reflected by the display module before entering the observation area for imaging. The detection module is used to obtain non-image light entering the image light path. The processor is configured to control at least one of the image sources to be turned off when the light signal of the non-image light exceeds a threshold; and / or control at least one of the reflection areas to be turned off.

[0031] The above technical solution is adopted, by setting at least two image sources, and setting a reflection area on the optical path of each image source, the propagation direction of the image light emitted by the image source is adjusted separately to form an independent virtual image. A detection module is used to detect the non-image light on the reverse optical path of each image light, and the processor compares the optical signal of the non-image light fed back by the detection module with the threshold. When the optical signal exceeds the threshold, that is, when the sunlight backflow is strong, at least one image source is controlled to be turned off to reduce the heat generated by the image source itself and extend the service life of the image source. Alternatively, at least one reflection area is controlled to be turned off to block the optical path of sunlight backflowing to the image source, reduce the energy concentration effect of external light on the image source, and reduce the risk of screen burn-in caused by sunlight backflowing to the image source, thereby extending the life of the image source and improving the virtual imaging effect.

[0032] The above is the core idea of ​​the present invention. The technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Figure 2 is a schematic structural diagram of a display device provided by an embodiment of the present invention, Figure 3 yes Figure 2 A schematic diagram of an optical path of a display device with a first image source turned off is provided in Figure 4 yes Figure 2 A schematic diagram of an optical path of a display device with a second image source turned off is provided in Figure 5 yes Figure 2 A schematic diagram of a light path of a display device with a first reflective area turned off is provided in Figure 6 yes Figure 2 A schematic diagram of a light path of a display device with a second reflective area closed is provided in Figure 2-Figure 6Specifically, the display device 200 provided in the embodiment of the present invention can be installed in a vehicle (such as a car), and can be a windshield-type head-up display (W-HUD), an augmented reality head-up display (AR-HUD), etc. The display device 200 includes an image module 20, a first dimming module 30, a display module 40, a detection module 50 and at least one processor ( Figure 2-Figure 6 not shown).

[0034] The image module 20 includes at least two image sources, which are used to emit image light, and the optical paths of the image light output by each image source do not interfere with each other. Among them, the image source is a picture generation unit (PGU for short), which can be a liquid crystal display panel, an organic or inorganic light-emitting display panel or a projector, etc., for providing a virtual image. The displayed content may include dashboard information, navigation information, lane indicators, construction indicators, accident indicators, and pedestrian detection indicator information.

[0035] In vehicle applications, the display module 40 is a front windshield, which can transmit light from the front field of the vehicle into the driver's eyes, and can also reflect image light emitted from the image source to the front of the driver to generate a virtual image.

[0036] The first dimming module 30 is arranged on the optical path of the image light, and the first dimming module 30 includes at least two reflection areas, one reflection area and one image source form a corresponding group, and the reflection areas in each corresponding group are located on the optical path of the image light emitted by the image source. Among them, the multiple reflection areas can be small-sized free-form surface mirrors, or plane mirrors. For example, refer to Figure 2-Figure 6 , take the image module 20 including the first image source 21 and the second image source 22 as an example. The first reflection area 31 is arranged on the optical path of the first image light S1 emitted by the first image source 21, the first reflection area 31 and the first image source 21 form a first corresponding group, the first reflection area 31 is used to reflect and converge the first image light S1 to the display module 40, the first image light S1 is reflected by the display module 40 to the front of the driver and generates a first virtual image M1. The second reflection area 32 is arranged on the optical path of the second image light S2 emitted by the second image source 22, the second reflection area 32 and the second image source 22 form a second corresponding group, the second reflection area 32 is used to reflect and converge the second image light S2 to the display module 40, the second image light S2 is reflected by the display module 40 to the front of the driver and generates a second virtual image M2. At the same time, according to the principle of reversible optical path, external light can also enter the image module 20 from the front windshield in the reverse direction of the propagation direction of the first image light S1 and the first image light S1, resulting in high temperature burn-in damage.

[0037] Compared with the prior art solution of using a whole free-form surface mirror, the present application divides the first dimming module 30 into a plurality of small-sized reflection areas, each of which is separately arranged on the optical path of the image light emitted by each image source. The small-sized reflection area is conducive to reducing the burn-in damage caused by the sunlight concentration effect formed by the large free-form reflector when the sunlight flows back. The image light emitted by each image source is reflected by its corresponding reflection area, and then reflected by the display module 40 and enters the observation area to generate a virtual image.

[0038] In order to reduce the risk of screen burn-in, the present application uses a detection module 50 to obtain non-image light entering the image light path and generate an optical signal based on the image light. Figure 2-Figure 6 In the figure, the position of the detection module 50 in the optical path is only for illustration. The non-image light can be the light entering the vehicle along the front field of view of the vehicle, or the light entering from the front windshield in the opposite direction of the propagation direction of the image light. After changes such as transmission, reflection, and refraction, these light rays can reach the image source in the opposite direction of the propagation direction of the image light, thereby generating a thermal effect on the image source.

[0039] The optical signal may be a voltage signal or a current signal, which is not limited in the present application. For example, the magnitude of the voltage value generated by the optical signal indicates the intensity of the non-image light. The larger the voltage value, the greater the intensity of the non-image light entering the display device, and the stronger the thermal effect generated on the image source.

[0040] The processor is connected to the image module 20, the detection module 50, and the first dimming module 30 respectively. In the embodiment of the present application, the processor can be a calculation control unit, which can be one or more chips or circuit bodies with calculation, storage, and information transmission functions such as a central processing unit (CPU), a graphics processing unit (GPU), a field programmable gate array (FPGA), etc. Its function is to receive information, calculate and analyze, send signals, and control devices such as the image module 20, the first dimming module 30, and the detection module 50.

[0041] In the embodiment of the present application, the processor is configured to control at least one image source to be turned off when the optical signal of the non-image light exceeds a threshold value; and / or control at least one reflection area to be turned off. Specifically, the processor receives the optical signal of the non-image light acquired by the detection module 50, and determines the magnitude of the optical signal and the threshold value. When the optical signal exceeds the threshold value: a feasible control method, refer to Figure 3 , control the first image source 21 to be turned on and the second image source 22 to be turned off. A feasible control method is shown in FIG. Figure 4 , control the first image source 21 to be turned off and the second image source 22 to be turned on. By turning off the image source, the heat generated by itself is reduced, and the risk of screen burn-in caused by sunlight backflow is reduced.

[0042] refer to Figure 2 When the processor determines that the light signal is less than or equal to the threshold, it indicates that there is no sunlight backflow or the sunlight backflow is weak. The processor normally opens the first image source 21 and the second image source 22 through the software strategy and the driving mechanism, and the display device works normally.

[0043] Furthermore, the reflection area can be closed to reduce the sunlight guide. The reflection area closure means that the reflection area does not reflect the image light emitted by its corresponding image source, or cannot reflect the image light to the display module 40. The method of closing the reflection area includes but is not limited to the position movement of the reflection area, the angle change, the reflectivity change of the reflection surface, etc., which is not specifically limited in the embodiment of the present application.

[0044] Specifically, when the position of the reflection area moves and / or the angle changes, the display device 200 may further include a mechanical control module ( Figure 2 (not shown), the processor is connected to the mechanical control module, the mechanical control module is connected to the first dimming module 30, processes the size of the light signal based on the non-image light, and controls the mechanical control module to adjust the position and angle of each reflection area.

[0045] For example, in an in-vehicle application, when the processor receives the optical signal of the non-image light acquired by the detection module 50 and determines that the optical signal exceeds the threshold, a feasible control method is as follows: Figure 5 The processor can also control the mechanical control module to move or rotate the first reflection area 31. A feasible control method is shown in FIG. Figure 6 The processor can also control the mechanical control module to move or rotate the second reflection area 32, so that the image light cannot reach the display module 40 even if it reaches the reflection area. According to the principle of reversible optical path, at least part of the external light cannot enter the image module 20 from the display module 40 (front windshield), thus reducing the energy radiation of the external light to the image source, which is conducive to improving the problem of weakening the virtual imaging display effect caused by the reflection of non-image light in the reflection area, thereby improving the visual imaging effect of virtual imaging and extending the service life of the image source.

[0046] It should be noted that the number of image sources of the image module 20 provided in the accompanying drawings of the embodiment of the present application is two. When the processor determines that the light signal exceeds the threshold, it is only necessary to randomly close one image source or close one reflection area. In some embodiments, when the number of image sources of the image module 20 is more than 2, one or more can be randomly closed, and at least one image source that is normally displayed can be retained. In some embodiments, the importance level of the virtual image of each image source can also be pre-set, and the image source with a low importance level can be closed first, and the image source imaging that displays important parameters can be retained. Since the present application adopts multi-channel virtual image display, it is not necessary to close all of them. In some embodiments, it is also possible to first close the image source with poor heat resistance based on the heat resistance of the image source itself, and so on. The purpose is to reduce the backflow of external light into the image source when the backflow of sunlight is strong, while still maintaining a certain image display function, avoiding the inability to display the virtual image due to full closure, and improving driving safety.

[0047] Figure 7 is a schematic structural diagram of another display device provided by an embodiment of the present invention, Figure 8 yes Figure 7 A schematic diagram of an optical path of a display device with a first image source turned off is provided in Fig. 9 yes Figure 7 A schematic diagram of a light path of a display device with a first reflective area turned off is provided in Fig.10 yes Figure 7 A schematic diagram of a light path of a display device with a first reflective area turned off is provided in Fig.11 yes Figure 8 A schematic diagram of an optical path of a display device with a second image source turned off is provided in Fig.12 yes Figure 7 A schematic diagram of a light path of a display device with a second reflective area turned off is provided in Fig.13 yes Figure 7 A schematic diagram of a light path of a display device with a second reflective area turned off is provided in FIG. Figure 7-Figure 13 , the processor is not shown.

[0048] Based on the above embodiments, Figure 7-Figure 13 The display device further includes a second dimming module 60, which is located on the optical path between the image module 20 and the first dimming module 30, and is used to reflect the image light emitted by the image source onto at least two reflection areas. In the embodiment of the present application, the second dimming module 60 can be a whole curved reflector, whose convex surface faces the image light, and has a reflection and convergence effect on the image light; or, a whole plane mirror can be used to reflect the image light emitted by each image source to the reflection area in the corresponding group, so as to adjust the propagation direction of the image light emitted by each image source and the imaging effect of the virtual image formed.

[0049] refer to Figure 7-Figure 13 The processor is configured to receive the optical signal of the non-image light acquired by the detection module 50, and when it is determined that the optical signal exceeds a threshold, control at least one image source to be turned off; and / or control at least one reflection area to be turned off.

[0050] For example, in an in-vehicle application, when the processor receives the optical signal of the non-image light acquired by the detection module 50 and determines that the optical signal is greater than the threshold: a feasible control method, refer to Figure 8 , control the first image source 21 to be turned off and the second image source 22 to be turned on. A feasible control method is shown in FIG. Fig.11 , control the first image source 21 to be turned on and the second image source 22 to be turned off. By turning off the image source, the heat generated by itself is reduced, and the risk of screen burn-in caused by sunlight backflow is reduced.

[0051] Based on the above embodiments, Fig. 9 and Fig.10 , Fig.12 and Fig.13 , the states of the reflection area include a reflection state and an off state. The reflection state means that the position and angle of the reflection area reflect the image light, and the off state means that the position and angle of the reflection area cannot reflect the image light. The rotation angles of the reflection area in the reflection state and the off state are different. In other words, when switching between the reflection state and the off state, the position and / or angle of the reflection area needs to be mechanically adjusted.

[0052] In the reflective state, the processor is configured to receive the optical signal of the non-image light acquired by the detection module 50, and when it is determined that the optical signal is less than or equal to the threshold, the processor controls the reflection area and / or angle so that the reflection area can reflect the image light to the display module 40, and the driver can see the virtual image generated by the image light in the observation area.

[0053] When the processor determines that the light signal of the non-image light exceeds the threshold, the processor is configured to control the first reflection area 31 or the second reflection area 32 to rotate from the reflection state to the closed state.

[0054] In the closed state, the processor is configured to move or rotate the first reflection area 31 or the second reflection area 32 through the mechanical control module so that it cannot reflect the image light emitted by its corresponding image source to the display module 40, so as to block at least part of the external light from the display module 40 to flow back to the image module 20, thereby reducing the harm of sunlight backflow.

[0055] Based on the above embodiments, continue to refer to Figure 5 and Figure 6, the state of the reflection area includes a reflection state and a scattering state. The scattering state refers to the position and angle of the reflection area that scatters the image light. The rotation angle of the reflection area in the reflection state and the scattering state is the same. In other words, when switching between the reflection state and the scattering state, there is no need to adjust the position and angle of the reflection area, and only the reflectivity of the reflection area to the image light needs to be adjusted. In an embodiment of the present application, the reflection area can be made of a material that switches between the reflection and scattering states, such as a liquid crystal box similar to a "reflective liquid crystal display screen", in which the liquid crystal layer is sandwiched between a light-transmitting upper substrate and a lower substrate, and a reflective film is arranged on the inner surface of the lower substrate. The liquid crystal box does not have structures such as a filter film and a polarizer, and the liquid crystal molecules in the liquid crystal layer are in an initial state, which can directly transmit light without generating a phase delay. The present application controls the reflectivity and astigmatism of the reflective liquid crystal display screen by adjusting the arrangement of the liquid crystal molecules in the reflective liquid crystal display screen.

[0056] In the reflective state, the processor is configured to adjust the arrangement direction and angle and other parameters of the liquid crystal molecules in the reflective liquid crystal display screen to be consistent, so that the image light can pass through the liquid crystal molecules to reach the reflective film without generating phase delay, and after being reflected by the reflective film, pass through the liquid crystal molecules again to reach the display module 40, and the driver can see the virtual image generated by the image light in the observation area.

[0057] When the processor determines that the light signal of the non-image light exceeds the threshold, the processor is configured to control the first reflection area 31 or the second reflection area 32 to rotate from the reflection state to the scattering state.

[0058] In the scattering state, the processor is set to adjust the scattered arrangement of liquid crystal molecules in the reflective liquid crystal display screen, and use the liquid crystal molecules to scatter and absorb the image light, so that the scattered image light cannot reach the display module 40 along the original light path. At the same time, the external light is also scattered on the reflective liquid crystal display screen and cannot reach the image source, thereby avoiding sunlight backflow. In the scattering state, the image source corresponding to the reflective area can be directly turned off to save energy.

[0059] It should be noted that the reflective liquid crystal display provided in the embodiment of the present application only reflects image light or radiates image light. When it is in the reflective state, the light information of the image light after passing through the liquid crystal molecules and reaching the display module 40 remains unchanged. The light information refers to the propagation direction and phase of the image light and the virtual image information it carries. The reflective liquid crystal display also includes a driving circuit and a driving electrode, etc., which are used to drive the deflection of the liquid crystal molecules. Those skilled in the art should clearly understand the driving principle of the liquid crystal display, and the embodiment of the present application will not be repeated.

[0060] Based on the above embodiments, Figure 2-Figure 13, the image source includes a first image source 21 and a second image source 22. At least two reflection areas include a first reflection area 31 and a second reflection area 32. The area of ​​the first reflection area 31 is larger than the area of ​​the second reflection area 32. In other words, the area of ​​the first reflection area 31 and the area of ​​the second reflection area 32 of the first dimming module 30 can be divided unequally according to the spot size of the image light emitted by the image source, so as to reflect image lights of different spot sizes. In vehicle-mounted applications, the area of ​​the second reflection area 32 with a smaller area should be as small as possible under the condition of ensuring the display of basic vehicle-mounted instrument data of the car and the display of driving safety data at the same time. Such a setting can minimize or eliminate the harm of the sunlight concentration effect caused by the second reflection area 32, extend the life of the second image source 22, and thus ensure the imaging effect. At the same time, when the sunlight backflow is strong, only the second reflection area 32 and the second image source 22 can be turned on to ensure the basic virtual display signal and basic driving safety. In this application, the first reflection area 31 is set on the optical path of the first image light S1 emitted by the first image source 21. The second reflection area 32 is disposed on the optical path of the second image light S2 emitted by the second image source 22. The imaging surface of the first image light S1 on the display module 40 is connected to, partially overlapped with, or not overlapped with the imaging surface of the second image light S2 on the display module 40.

[0061] Specifically, the first virtual image M1 generated by the first image light S1 and the second virtual image M2 generated by the second image light S2 may be two independent virtual images or two interrelated images. When the information displayed by the first virtual image M1 and the second image light S2 is interrelated, the two virtual images may be spliced ​​and combined into one picture, and the two may jointly display information including but not limited to instrument panel information, navigation information, lane indicators, construction indicators, accident indicators, pedestrian detection indicator information, etc.

[0062] Based on the above embodiments, Figure 2 and Figure 7 , the image distance of the first image light S1 on the display module 40 and the image distance of the second image light S2 on the display module 40 are different or the same. In the embodiment of the present application, the image distance of the corresponding different virtual images can be changed by adjusting the curvature radius of each reflection area. For example, the curvature radius of at least one of the first dimming module 30 and the second dimming module 60 is adjusted, thereby adjusting the image distance from the image plane of the virtual image to the driver's pupil and adjusting the size of the virtual image to meet the best visual effect.

[0063] Among them, the radius of curvature is mainly used to describe the degree of bending change of a curve at a certain point on the curve. The larger the radius of curvature, the flatter the mirror surface, the larger the focal length, and the light projected on the reflecting surface will be reflected back at a smaller reflection angle. Therefore, the convergence point of the light (image plane) is farther away from the reflector (display module 40).

[0064] Exemplarily, the image distance of the first image light S1 on the display module 40 is the same as the image distance of the second image light S2 on the display module 40, and the first virtual image M1 generated by the first image light S1 and the second virtual image M2 generated by the second image light S2 are coplanar, generating a virtual image without a sense of depth. The image distance of the first image light S1 on the display module 40 is different from the image distance of the second image light S2 on the display module 40, and the first virtual image M1 and the second virtual image M2 are not coplanar, and there is a sense of depth. For example, it is used to create a sense of depth when displaying a W-HUD dual-focal plane virtual image, or to create a sense of depth when displaying an AR-HUD, so as to improve the imaging effect of the virtual image and enhance the user's visual experience.

[0065] Based on the above embodiments, Figure 2-Figure 13 , the first image source 21 and the second image source 22 are independent control units; or, the first image source 21 and the second image source 22 are mutually related control units. In the embodiment of the present application, the first image source 21 and the second image source 22 can be two independent image generation units, or two independently controllable and driven regions of an image generation unit, and can generate multiple independent virtual images, as long as the multiple virtual images do not interfere with each other, which is not limited in the embodiment of the present application.

[0066] Based on the above embodiments, Figure 2-Figure 13 , the first reflection area 31 is arranged to be located on the optical path of the first image light S1, and the area of ​​the first reflection area 31 is larger than the spot size of the first image light S1 in the first reflection area 31. Such arrangement can utilize the first reflection area 31 to completely reflect the first image light S1 to the display module 40, thereby improving the transmission efficiency of the first image light S1 and enhancing the imaging effect of the first virtual image M1.

[0067] Based on the above embodiments, Figure 2-Figure 13 , the second reflection area 32 is arranged to be located on the optical path of the second image light S2, and the area of ​​the second reflection area 32 is larger than the spot size of the second image light S2 in the second reflection area 32. Such arrangement can utilize the second reflection area 32 to completely reflect the second image light S2 to the display module 40, thereby improving the transmission efficiency of the second image light S2 and enhancing the imaging effect of the second virtual image M2.

[0068] Fig.14 is a schematic diagram of dividing the viewing angle of a display device provided by an embodiment of the present invention, with reference to Figure 2-Figure 13 and Fig.14 The ratio of the area of ​​the first reflection region 31 to the area of ​​the second reflection region 32 is the same as the ratio of the viewing angle of the first image light S1 in the display module 40 to the viewing angle of the second image light S2 in the display module 40 .

[0069] The display device of the embodiment of the present application may be a head-up display (HUD). The field of view (FOV) of the HUD refers to the size of the display area that the driver can see when using the HUD. The FOV determines the range of information that the HUD can display, affecting the convenience and safety of the driver in obtaining information.

[0070] Exemplary, reference Figure 2 and Figure 7 , the display module 40 is a front windshield, and the driver faces the direction of the front windshield. The field of view of the first virtual image M1 observed in front of the front windshield is the first field of view FOV1, and the field of view of the second virtual image M2 is the second field of view FOV2. According to the needs of the vehicle-mounted display information, the sizes of the first field of view FOV1 and the second field of view FOV2 can be the same or different, and the first virtual image M1 and the second virtual image M2 can overlap or not overlap, etc. In the embodiment of the present application, the ratio of the area of ​​the first reflection area 31 to the area of ​​the second reflection area 32 can be synchronously set according to the ratio of the first field of view FOV1 and the second field of view FOV2, to ensure that each reflection area can completely reflect the image light to generate a complete virtual image, thereby improving the brightness and contrast of each virtual image.

[0071] Optional, reference Fig.14 The viewing angles of the first image light S1 and the second image light S2 in the display module 40 are divided according to the vertical direction or the horizontal direction.

[0072] For example, Fig.14 The X direction is the horizontal direction. Fig.14 The Y direction represents the vertical direction. The size of the display area corresponding to the FOV of the display device is 10*5. 10*5 refers to the ratio of the length of the display area corresponding to the FOV in the horizontal direction to the vertical direction. Fig.14 As shown in Figure (a), the area division ratio of the first reflection area 31 and the second reflection area 32 can be divided based on the field of view in the vertical direction. The first field of view FOV1=10*4 corresponding to the first reflection area 31 with a larger area can be allocated to display basic vehicle instrument data of the vehicle to ensure the display of travel safety data such as vehicle speed during driving. The second field of view FOV2=10*1 corresponding to the second reflection area 32 with a smaller area displays information related to vehicle navigation or other data, such as weather, temperature, etc.

[0073] refer to Fig.14As shown in the middle (b) figure, the area division ratio of the first reflection area 31 and the second reflection area 32 can be divided based on the field of view in the horizontal direction. The first field of view FOV1=7*5 corresponding to the first reflection area 31 with a larger area can be allocated to display basic vehicle instrument data of the vehicle to ensure the display of travel safety data during the driving process of the vehicle; the second field of view FOV2=3*5 corresponding to the second reflection area 32 with a smaller area can be allocated to display information related to vehicle navigation or other data, such as weather, temperature, etc.

[0074] It should be noted that when the first image source 21 and the second image source 22 are two independent image generating units, or are composed of two independently controllable and driven areas of an image generating unit, the division ratio of the light emitting area of ​​the first image source 21 and the light emitting area of ​​the second image source 22 is consistent with the division ratio of the area of ​​the first reflection area 31 and the second reflection area 32.

[0075] Based on the above embodiments, Figure 2-Figure 6 The detection module 50 includes a light intensity detection unit 51 and / or a light direction detection unit 52. The light intensity detection unit 51 and the light direction detection unit 52 are both disposed on the display module 40. The light intensity detection unit 51 is used to detect the light intensity of the non-image light on the display module 40. The light direction detection unit 52 is used to detect the light direction of the non-image light on the display module 40.

[0076] Among them, the light intensity detection unit 51 can use a photosensitive sensor, including but not limited to a light dependent resistor (Light Dependent Resistor, LDR), a photodiode (Photodiode) and a phototransistor (Phototransistor). In the embodiment of the present application, the photosensitive sensor can be set in the edge area of ​​the display module 40. When the external sunlight irradiates the display area on the display module 40, the photosensitive sensor can generate different electrical signals according to the change of light intensity, and transmit the electrical signals to the processor. Based on the electrical signal generated by the change of light intensity, the processor controls at least one image source and / or at least one reflection area to be turned off when it is judged that the electrical signal exceeds the threshold, that is, when the light intensity is too high, so as to reduce the burn-in hazard caused by the excessive light intensity of the sunlight backflow.

[0077] The light direction detection unit 52 can be a sensor array composed of multiple photosensors, and the direction of the light source is determined by comparing the signals of each sensor. In the embodiment of the present application, the sensor array can be set in the edge area of ​​the display module 40. When the external sunlight shines on the display area on the display module 40, the photosensor can generate different electrical signals according to the change of the light direction, and transmit the electrical signals to the processor. For example, at noon, the sunlight is vertically incident, and the sunlight backflow at this moment is more serious. The processor generates an electrical signal based on the change of the light direction. When it is judged that the electrical signal exceeds the threshold, that is, when the light direction is vertically incident, at least one image source and / or at least one reflection area is controlled to be closed to reduce the burn-in damage caused by direct light intensity and excessive energy during sunlight backflow.

[0078] The light intensity detection unit 51 and the light direction detection unit 52 may also be a detection device having both light intensity and light direction detection functions. Figure 7-Figure 13 In the embodiments provided in, the light intensity detection unit 51 and / or the light direction detection unit 52 may also be provided on the display module 40, and their functions are the same as those in the above embodiments, and the embodiments of the present application will not be shown one by one.

[0079] Fig.15 is a schematic diagram of the structure of another display device provided by an embodiment of the present invention, referring to Figure 7 and Fig.15 The detection module 50 includes at least one temperature detection unit 53, which is arranged on the image source and is used to detect the temperature of the photosensitive surface of the image source.

[0080] Among them, the temperature detection unit 53 can use a temperature sensor, including but not limited to a thermistor, a thermocouple, an integrated temperature sensor, etc. In the embodiment of the present application, the temperature sensor can be set in the image source area, and the temperature sensor detects the temperature of the photosensitive surface of the image source to generate different electrical signals, and transmits the electrical signals to the processor. Based on the electrical signal generated by the temperature change, the processor controls at least one image source and / or at least one reflection area to be closed when it is judged that the electrical signal exceeds the threshold, that is, when the temperature is too high, so as to reduce the burn-in hazard caused by the backflow of sunlight and the superposition of its own heat generation.

[0081] For example, continue to refer to Fig.15 The embodiment of the present application adopts two temperature detection units 53 to detect the temperatures of the photosensitive surfaces of the first image source 21 and the second image source 22 respectively. When the processor determines that the electrical signal of the temperature of the photosensitive surface of the first image source 21 is higher than a threshold value, the processor controls it to be turned off; and / or, when the processor determines that the electrical signal of the temperature of the photosensitive surface of the second image source 22 is higher than a threshold value, the processor controls it to be turned off, so as to protect the image source.

[0082] Based on the above embodiments, Figure 7-Figure 13 , the detection module 50 includes an infrared detection unit 54, which is located on the light-transmitting surface of the second dimming module 60 and is used to detect infrared band light that passes through the second dimming module. In the embodiment of the present application, the second dimming module 60 is also designed to be able to transmit infrared band light, such as light with a wavelength range of 0.77μm to 1000μm. Light in this band can easily penetrate the photosensitive surface of the image source, causing the image source to heat up quickly, causing device damage, etc. The infrared detection unit 54 is set on the back of the reflective surface of the second dimming module 60. The infrared detection unit 54 detects infrared band light and generates different electrical signals based on information such as the wavelength and temperature of the infrared band light. The processor detects the degree of sunlight backflow based on the electrical signal. When it is judged that the electrical signal exceeds the threshold, that is, when there is too much infrared band light and the energy is too large, the processor controls at least one image source and / or at least one reflection area to be closed to reduce the burn-in hazard caused by the backflow of infrared band light and its own heat generation.

[0083] Based on the above embodiments, continue to refer to Figure 7-Figure 13 The infrared detection unit 54 can also be combined with the temperature detection unit 53. When the temperature detection unit 53 detects the temperature of the photosensitive surface of the image source, the infrared detection unit 54 simultaneously detects the degree of infrared sunlight backflow. When it is determined that there is a large amount of infrared light backflow and the temperature rises, the processor immediately shuts down the image source and / or the reflection area to avoid the harm of image source burn-in caused by the convergence of a large amount of infrared light and high heat.

[0084] It should be noted that the light intensity detection unit 51 and the light direction detection unit 52 can also be arranged Figure 7-Figure 13 On the display module 40 shown in FIG. 1 , the temperature detection unit 53 may also be arranged Figure 7-Figure 13 On the image source shown, the infrared detection unit 54 can also be set Figure 7-Figure 13 The back side of the reflective surface of the second dimming module 60 shown also has the beneficial effects of the display device in the above embodiment. The similarities can be understood by referring to the above explanation of the display device, which will not be repeated here.

[0085] Based on the same inventive concept, an embodiment of the present invention further provides a means of transportation. Fig.16 FIG. 1 is a schematic diagram of a display device provided by an embodiment of the present invention being applied in a vehicle. Fig.16 As shown, the display device 200 is installed in a vehicle and also has the beneficial effects of the display device in the above-mentioned embodiment. The vehicle can be a car, a ship, an aircraft, etc. The display module is a front windshield, and the user sees a virtual image at the image plane through the windshield. The similarities can be understood by referring to the above explanation of the display device, and will not be repeated below.

[0086] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display device, characterized in that: include: An image module, comprising at least two image sources, wherein the image sources are used to emit image light; A first dimming module includes at least two reflection areas, one of the reflection areas and one of the image sources form a corresponding group, and the reflection areas in each corresponding group are located on the optical path of the image light emitted by the image source; A display module, wherein the image light emitted by the image source is reflected by the corresponding reflection area and then reflected by the display module before entering the observation area for imaging; A detection module, used for acquiring non-image light entering the image light path; At least one processor is configured to control at least one of the image sources to be turned off when the light signal of the non-image light exceeds a threshold; and / or control at least one of the reflection areas to be turned off.

2. The display device according to claim 1, characterized in that The at least two reflection areas include a first reflection area and a second reflection area; The area of ​​the first reflection area is greater than the area of ​​the second reflection area; The at least two image sources include a first image source and a second image source; the first reflection area is located on the optical path of the first image light emitted by the first image source; the second reflection area is located on the optical path of the second image light emitted by the second image source; An imaging surface of the first image light on the display module is connected to, partially overlapped with, or has no overlap with an imaging surface of the second image light on the display module.

3. The display device according to claim 2, characterized in that: An image distance of the first image light on the display module and an image distance of the second image light on the display module are different or the same.

4. The display device according to claim 2, characterized in that: The first image source and the second image source are independent control units; or, the first image source and the second image source are mutually associated control units.

5. The display device according to claim 2, characterized in that: The area of ​​the first reflection region is larger than the spot size of the first image light in the first reflection region; the area of ​​the second reflection region is larger than the spot size of the second image light in the second reflection region.

6. The display device according to claim 2, characterized in that: The ratio of the area of ​​the first reflection region to the area of ​​the second reflection region is the same as the ratio of the viewing angle of the first image light in the display module to the viewing angle of the second image light in the display module.

7. The display device according to claim 6, characterized in that: The viewing angles of the first image light and the second image light in the display module are divided according to a vertical direction or a horizontal direction.

8. The display device according to claim 1, characterized in that: The detection module includes a light intensity detection unit and / or a light direction detection unit; The light intensity detection unit and the light direction detection unit are both arranged on the display module; The light intensity detection unit is used to detect the light intensity of the non-image light on the display module; the light direction detection unit is used to detect the light direction of the non-image light on the display module.

9. The display device according to claim 1, characterized in that: The detection module includes at least one temperature detection unit, which is disposed on the image source and is used to detect the temperature of the photosensitive surface of the image source.

10. The display device according to claim 1, characterized in that It also includes a second dimming module; the second dimming module is located on the optical path between the image module and the first dimming module; and is at least used to reflect the image light emitted by the image source onto at least two of the reflection areas.

11. The display device according to claim 10, characterized in that: The detection module comprises an infrared detection unit, and the infrared detection unit is located on the light-transmitting surface of the second dimming module and is used for detecting infrared light passing through the second dimming module.

12. The display device according to claim 1, characterized in that: The state of the reflection area includes a reflection state and a closed state; The reflection area has different rotation angles in the reflection state and the closed state; The processor is configured to control at least one of the reflection zones to be closed, including: The processor is configured to control the reflective area to rotate from a reflective state to a closed state.

13. The display device according to claim 1, characterized in that: The state of the reflection area includes a reflection state and a scattering state, and the rotation angle of the reflection area in the reflection state and the scattering state is the same; The processor is configured to control at least one of the reflection zones to be closed, including: The processor is configured to control the reflection area to switch from a reflection state to a scattering state.

14. A means of transport, characterized in that: A display device comprising any one of claims 1-13.

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