Head-up display capable of preventing sunlight from flowing backwards, method for preventing sunlight from flowing backwards and vehicle

Abstract

The invention relates to the technical field of head-up display equipment, particularly provides a head-up display capable of preventing sunlight from flowing backwards, a method for preventing sunlight from flowing backwards and a vehicle, and aims to solve the problem that the blocking degree of sunlight cannot be adjusted according to the intensity of sunlight entering the head-up display in the conventional scheme for preventing sunlight from flowing backwards. In order to achieve the purpose, the head-up display comprises a shell, an image source and a curved mirror, the image source and the curved mirror are arranged in the shell, the shell is provided with a light outlet, and the head-up display further comprises a photosensitive sensor arranged in the shell and used for detecting the illumination intensity of light irradiating into the shell; the electrochromic film is arranged at the light outlet; the control module is connected with the photosensitive sensor and is used for acquiring the illumination intensity of the light irradiated into the shell; the control module is further electrically connected with the electrochromic film and used for adjusting the light transmittance of the electrochromic film according to the obtained illumination intensity. The head-up display can adjust the light transmittance of the inner electrochromic film according to the illumination intensity of the light incident to the head-up display.

Description

Technical Field

[0001] The present invention relates to the technical field of head-up display equipment, and in particular to a head-up display for preventing sunlight backflow, a method for preventing sunlight backflow, and a vehicle. Background Art

[0002] The head-up display (HUD) projects the light emitted by the image source onto the windshield of the vehicle through a reflective optical design, and uses the car windshield to form an image (virtual image), so that the head-up display can project an image containing information. While the driver is watching the real environment outside the windshield, he can also watch the image of the head-up display. Therefore, the driver can directly see the picture without lowering his head, avoiding the distraction caused by the driver looking down at the dashboard during driving, improving the driving safety factor, and also giving the driver a better driving experience.

[0003] An image source is provided inside the head-up display. When strong external light (for example, sunlight) propagates in the reverse direction along the optical path of the image formed when the head-up display is working normally, enters the head-up display through the windshield, and finally impinges on the image source, forming sunlight backflow, the temperature of the image source will increase, which may affect the normal operation of the image source.

[0004] Traditional solutions to prevent sunlight backflow usually involve coating the dust cover of the head-up display with a polarizing film and the plane mirror with an infrared cutoff film to weaken the energy of sunlight. However, after such a setting, the light emitted by the image source is also blocked. In order to obtain the same image brightness, the image source can only increase its own backlight brightness; this leads to an increase in the image source power, and also brings about the problem of heating of the image source itself. Moreover, the degree of sunlight blocking cannot be adjusted according to the intensity of sunlight incident on the head-up display. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing anti-sunlight backflow solution cannot adjust the degree of blocking sunlight according to the intensity of sunlight incident on the head-up display.

[0006] In a first aspect, the present invention provides a head-up display for preventing sunlight backflow, comprising a shell and an image source and a curved mirror arranged in the shell, the shell being provided with a light outlet opposite to a vehicle windshield, and further comprising: a photosensitive sensor arranged in the shell for detecting the light intensity of light irradiating into the shell; an electrochromic film arranged at the light outlet of the shell; a control module connected to the photosensitive sensor for obtaining the light intensity of light irradiating into the shell detected by the photosensitive sensor; the control module is also electrically connected to the electrochromic film for adjusting the light transmittance of the electrochromic film according to the obtained light intensity.

[0007] Furthermore, the photosensitive sensor is arranged inside or outside the image source.

[0008] Further, when the photosensitive sensor is arranged inside the image source, the photosensitive sensor is a planar sensor.

[0009] Furthermore, the photosensor is arranged on the curved mirror to detect the light intensity of the light incident on the curved mirror.

[0010] Furthermore, the photosensor is made of transparent material.

[0011] Furthermore, the light sensor is an infrared light sensor and / or an ultraviolet light sensor.

[0012] Furthermore, a cover plate is provided at the light outlet of the shell, and the electrochromic film is adhered to the cover plate.

[0013] In a second aspect, the present invention further provides a method for preventing sunlight backflow, which is applied to the head-up display for preventing sunlight backflow as described above, and the method includes the following steps: a photosensitive sensor detects the light intensity of light irradiated into the shell of the head-up display for preventing sunlight backflow, and sends the detected light intensity value to a control module; the control module compares the received light intensity value with a preset light intensity threshold; the control module adjusts the light transmittance of the electrochromic film according to the comparison result of the received light intensity value and the preset light intensity threshold.

[0014] Furthermore, the step in which the control module adjusts the light transmittance of the electrochromic film according to the comparison result of the received light intensity value with the preset light intensity threshold includes: pre-setting the correspondence between the light intensity value and the light transmittance of the electrochromic film in the control module; after receiving the light intensity value, the control module compares it with a preset first light intensity threshold; when the light intensity value is greater than the first light intensity threshold, the control module adjusts the light transmittance of the electrochromic film according to the light intensity value based on the correspondence.

[0015] In a third aspect, the present invention further provides a vehicle, comprising the head-up display for preventing sunlight intrusion as described above.

[0016] In the case of adopting the above technical solution, the present invention can control the transparent state of the electrochromic film according to the light intensity detected by the photosensor obtained by the control module, thereby adjusting the light transmittance of the electrochromic film. This prevents sunlight from propagating in the reverse direction along the light path of the head-up display when the head-up display is working normally, entering the head-up display through the vehicle windshield, and finally incident on the image source to form sunlight backflow, causing the temperature of the image source to rise. This protects the image source. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the structure of a head-up display for preventing sunlight backflow in the first embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the structure of a head-up display for preventing sunlight backflow in the second embodiment of the present application;

[0020] Figure 3 It is a schematic flow chart of the method for preventing sunlight backflow in an embodiment of the present application;

[0021] Figure 4 Schematic diagram of the process of step S300 in the method for preventing sunlight backflow in the embodiment of the present application.

[0022] Reference numerals:

[0023] 1. Shell; 11. Light outlet; 2. Image source; 3. Curved mirror; 4. Electrochromic film; 5. Cover plate; 6. Plane mirror. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0025] First, it should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "longitudinal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Embodiment 1

[0028] like Figure 1 As shown, the embodiment of the present application provides a head-up display for preventing sunlight backflow, which includes: a housing 1, an image source 2 and a curved mirror 3 arranged in the housing 1, and the housing 1 is provided with a light outlet 11 opposite to the vehicle windshield. The light emitted by the image source 2 is reflected by the curved mirror 3 and emitted from the light outlet 11, and is projected onto the vehicle windshield, and an image (virtual image) is formed by using the vehicle windshield.

[0029] A photosensitive sensor (not shown in the figure) is also provided in the housing 1 to detect the light intensity of the light (sunlight) irradiated into the housing 1. An electrochromic film 4 is provided at the light outlet 11 of the housing 1. The head-up display for preventing sunlight backflow in this embodiment also includes a control module (not shown in the figure), which is connected to the photosensitive sensor and is used to obtain the light intensity of the light irradiated into the housing 1 detected by the photosensitive sensor. The control module is also electrically connected to the electrochromic film 4 to control the transparent state of the electrochromic film 4 according to the light intensity detected by the photosensitive sensor obtained by the control module, thereby adjusting the light transmittance of the electrochromic film 4. This prevents sunlight from propagating in the reverse direction along the light path of the imaging when the head-up display is working normally, entering the head-up display through the vehicle windshield, and finally incident on the image source 2 to form sunlight backflow, causing the temperature of the image source 2 to rise. This protects the image source 2.

[0030] The optical properties (reflectivity, transmittance, absorptivity, etc.) of the material making the electrochromic film 4 can undergo a stable and reversible color change under the action of an external electric field, which is manifested in the reversible change of the color and transparency of the electrochromic film 4 in appearance.

[0031] In order to firmly fix the electrochromic film 4 at the light outlet 11 of the housing 1, as shown in FIG. Figure 1 As shown, a cover plate 5 may be provided at the light outlet 11 of the housing 1 , and the electrochromic film 4 may be adhered to the cover plate 5 .

[0032] Furthermore, the photosensitive sensor can be arranged inside or outside the image source 2. Specifically, when the photosensitive sensor is arranged outside the image source 2, the photosensitive sensor can be arranged on the display panel of the image source 2 to detect the light intensity of the light irradiated on the display panel of the image source 2; or it can be arranged near the display panel of the image source 2. When the photosensitive sensor is arranged inside the image source 2, since the photosensitive sensor will not affect the propagation and imaging of the light emitted by the image source 2, in this case, the photosensitive sensor is a planar sensor. For example, a CMOS (Complementary Metal Oxide Semiconductor) sensor or a CCD (Charge Coupled Device) sensor. Planar sensors have a larger light-collecting area, and a smaller number of them can achieve a better effect of detecting the light intensity.

[0033] Furthermore, the photosensitive sensor disposed inside the image source 2 is not limited to being disposed on the liquid crystal module of the display panel of the image source 2, but may also be disposed on the backlight module of the display panel. For example, the display panel includes a light emitting area for emitting imaging light and a light passing area for allowing external light to pass through; the photosensitive sensor may be disposed on the backlight module and disposed opposite to the light passing area, so that the light intensity of the external light incident on the display panel can also be detected.

[0034] Furthermore, a photosensor may also be disposed on the curved mirror 3 to detect the light intensity of the light incident on the curved mirror 3 .

[0035] In order to prevent the light sensor from affecting the display function of the head-up display, the light sensor can be made of a transparent material. The light sensor made of a transparent material can avoid blocking the propagation of the light emitted from the image source 2, whether it is arranged inside or outside the image source 2, or arranged on the curved mirror 3.

[0036] Furthermore, the photosensitive sensor can also be an array of translucent sensors made of transparent materials, including multiple translucent photosensitive sensors, including but not limited to PIN stacked structure photosensitive sensors composed of polycrystalline silicon P-Si and amorphous silicon A-Si, translucent metal film structure photosensitive sensors, metal oxide film structure photosensitive sensors or rare earth doped transparent inorganic material structure photosensitive sensors, etc.

[0037] The light emitted by the backlight module of the display panel of the image source 2 as described above is generally visible light, including: ordinary white light (white light generated by ultraviolet light / blue light exciting phosphor), RGB mixed white light (white light mixed by three RGB light sources in a certain proportion). Sunlight includes: ultraviolet light, visible light and infrared light. Therefore, the photosensitive sensor can be an infrared light sensor and / or an ultraviolet light sensor, so as to more accurately detect the light intensity of the external light incident on the head-up display.

[0038] Embodiment 2

[0039] like Figure 2 As shown, the embodiment of the present application also provides another head-up display for preventing sunlight backflow, and its structure is different from the head-up display for preventing sunlight backflow in the first embodiment in that in addition to the image source 2 and the curved mirror 3, a plane mirror 6 is also provided in the housing 1. The light emitted by the image source 2 is reflected by the plane mirror 6 and the curved mirror 3 in turn, and then emitted from the light outlet 11, projected onto the windshield of the vehicle, and an image (virtual image) is formed by using the windshield of the vehicle.

[0040] In this embodiment, the photosensor can be arranged inside or outside the image source 2 as well as on the plane mirror 6 and / or the curved mirror 3 to detect the light intensity of the light incident on the plane mirror 6 and / or the curved mirror 3 .

[0041] In the embodiment of the present application, when no sunlight enters the head-up display housing 1, the electrochromic film 4 is set to have a high light transmittance, and the image source 2 can output high brightness when operating at low power. When sunlight backflow occurs, the light transmittance of the electrochromic film 4 is lowered to protect the image source 2.

[0042] like Figure 3 As shown, the embodiment of the present application further provides a method for preventing sunlight backflow, which is applied to the head-up display for preventing sunlight backflow as described above, and includes the following steps:

[0043] Step S100: The light sensor detects the light intensity of the light irradiated into the housing 1 of the head-up display for preventing sunlight backflow, and sends the detected light intensity value to the control module.

[0044] Step S200: the control module compares the received light intensity value with a preset light intensity threshold;

[0045] Step S300: the control module adjusts the light transmittance of the electrochromic film 4 according to the comparison result between the received light intensity value and the preset light intensity threshold.

[0046] Furthermore, if Figure 4 Said step 300 further comprises the following steps:

[0047] Step S310: presetting the corresponding relationship between the light intensity value and the light transmittance of the electrochromic film 4 in the control module.

[0048] Step S320: After receiving the light intensity value, the control module compares it with a preset first light intensity threshold.

[0049] Step S330: when the light intensity value is greater than the first light intensity threshold, the control module adjusts the light transmittance of the electrochromic film 4 according to the light intensity value based on the corresponding relationship.

[0050] When the light intensity value received by the control module does not reach the first light intensity threshold, the control module determines that no external light is incident on the head-up display housing 1 or on the image source 2; or, external light is incident on the head-up display housing 1 or on the image source 2, but the light intensity does not reach the level that may damage the image source 2. In this state, the electrochromic film 4 is transparent, and the light transmittance of the electrochromic film 4 can be 100%.

[0051] In a specific embodiment, the first illumination intensity threshold is set to 30,000 lux. When the illumination intensity value received by the control module is lower than 30,000 lux, the control module determines that the light will not damage the image source 2, and the light transmittance of the electrochromic film 4 is 100%. In addition, the second illumination intensity threshold can be set as the upper limit of the illumination intensity value received by the control module as needed, for example, the second illumination intensity threshold is set to 100,000 lux. The light transmittance of the electrochromic film 4 corresponding to the second illumination intensity threshold is 10%. When the illumination intensity value received by the control module is between the set value of the first illumination intensity threshold of 30,000 lux and the set value of the second illumination intensity threshold of 100,000 lux, the light transmittance of the electrochromic film 4 can be adjusted accordingly according to the corresponding relationship between the preset illumination intensity value stored in the control module and the light transmittance of the electrochromic film 4, so as to protect the image source 2 from being damaged due to excessive illumination intensity of the light.

[0052] The corresponding relationship between the light intensity value received by the control module and the light transmittance of the electrochromic film 4 can be set as needed, for example, the two are in a linear relationship. This embodiment of the present application does not specifically limit this.

[0053] When the light intensity value received by the control module is greater than the first light intensity threshold, the control module determines that the light intensity of the light incident into the head-up display housing 1 at this time has reached a level that may damage the image source 2, and protective measures need to be taken to protect the image source 2. At this time, the control module supplies power to the electrochromic film 4, so that the electrochromic film 4 changes from a transparent state without light shielding to a non-transparent state with light shielding. Based on the correspondence between the light intensity value and the light transmittance of the electrochromic film 4 pre-set therein, the control module adjusts the light transmittance of the electrochromic film 4 to a corresponding value according to the light intensity value. Thereby reducing the light intensity of the light irradiated on the image source 2, preventing the image source 2 from being damaged by excessive irradiation, and playing a role in protecting the image source 2.

[0054] The control module will adjust the light transmittance of the electrochromic film 4 in real time according to the change of the received light intensity value and based on the correspondence between the light intensity value and the light transmittance of the electrochromic film 4 preset therein.

[0055] When the light intensity value received by the control module changes from being greater than the first light intensity threshold to being less than the first light intensity threshold, the control module determines that the light intensity of the light incident into the head-up display housing 1 at this time will not cause damage to the image source 2. The control module adjusts the light transmittance of the electrochromic film 4 accordingly, so that the electrochromic film 4 is converted from a light-shielding non-transparent state to a non-light-shielding transparent state.

[0056] An embodiment of the present application further provides a vehicle, which includes the head-up display for preventing sunlight backflow as described above.

[0057] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A head-up display for preventing sunlight backflow, comprising a housing (1) and an image source (2) and a curved mirror (3) arranged in the housing (1), wherein the housing (1) is provided with a light outlet (11) opposite to a vehicle windshield, characterized in that: Also includes: A light sensor, which is arranged in the housing (1) and is used to detect the light intensity of light irradiated into the housing (1); An electrochromic film (4) arranged at the light outlet (11) of the housing (1); A control module connected to the light sensor and used to obtain the light intensity of the light irradiated into the housing (1) detected by the light sensor; The control module is also electrically connected to the electrochromic film (4) and is used to adjust the light transmittance of the electrochromic film (4) according to the light intensity obtained by the control module.

2. The head-up display according to claim 1, characterized in that: The photosensor is arranged inside or outside the image source (2).

3. The head-up display according to claim 2, characterized in that: When the light-sensitive sensor is arranged inside the image source (2), the light-sensitive sensor is a planar sensor.

4. The head-up display according to claim 1, characterized in that: The light-sensitive sensor is arranged on the curved mirror (3) and is used to detect the light intensity of light incident on the curved mirror (3).

5. The head-up display according to any one of claims 1 to 4, characterized in that: The photosensor is made of transparent material.

6. The head-up display according to any one of claims 1 to 4, characterized in that: The light sensor is an infrared light sensor and / or an ultraviolet light sensor.

7. The head-up display according to any one of claims 1 to 4, characterized in that: A cover plate (5) is provided at the light outlet (11) of the housing (1), and the electrochromic film (4) is adhered to the cover plate (5).

8. A method for preventing sunlight backflow, characterized in that: The method is applied to the head-up display for preventing sunlight backflow as claimed in any one of claims 1 to 7, comprising the following steps: The light sensor detects the light intensity of the light irradiated into the housing (1) of the head-up display for preventing sunlight backflow, and sends the detected light intensity value to the control module; The control module compares the received light intensity value with a preset light intensity threshold; The control module adjusts the light transmittance of the electrochromic film (4) according to a comparison result between the received light intensity value and the preset light intensity threshold.

9. The method for preventing sunlight backflow according to claim 8, characterized in that: The step of the control module adjusting the light transmittance of the electrochromic film (4) according to the comparison result of the received light intensity value and the preset light intensity threshold comprises: Presetting the corresponding relationship between the light intensity value and the light transmittance of the electrochromic film (4) in the control module; After receiving the light intensity value, the control module compares it with a preset first light intensity threshold; When the light intensity value is greater than the first light intensity threshold, the control module adjusts the light transmittance of the electrochromic film (4) according to the light intensity value based on the corresponding relationship.

10. A vehicle, characterized in that: A head-up display for preventing sunlight intrusion as claimed in any one of claims 1 to 7.

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