Head-up display device capable of avoiding burn-in caused by sunlight backflow and automobile

Abstract

The invention discloses a head-up display device capable of avoiding screen burn-in caused by sunlight backward flow and an automobile, the head-up display device capable of avoiding screen burn-in caused by sunlight backward flow comprises a TFT display module and a transparent bearing body, and the surface of the transparent bearing body is provided with a high-transmittance and high-reflection film layer. The high-transmittance and high-reflection film layer is arranged on a propagation path of emergent light of the TFT display module, the high-transmittance and high-reflection film layer can reflect S light with the wavelength ranging from 400 nm to 780 nm, and other light except the S light with the wavelength ranging from 400 nm to 780 nm can penetrate through the high-transmittance and high-reflection film layer. According to the TFT display module, 50% of P light in visible light penetrates through the high-transmittance and high-reflection film layer and the transparent bearing body and cannot be reflected to the surface of the TFT display module, the irradiation ratio of the visible light with the wavelength ranging from 400 nm to 780 nm is 50%, only 50% of S light in sunlight can be reflected to the surface of a TFT, the overall irradiation amount is 25%, the irradiation amount is greatly reduced, and the burn-in problem can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more particularly to a head-up display device and a car that prevent screen burn-in caused by sunlight backflow. Background Art

[0002] The installed capacity of HUDs, or head-up displays, is increasing year by year, particularly for those using TFT display modules as image sources. Light emitted from the TFT display module's image source travels through an internal optical path and ultimately projects onto the windshield. Due to the reversibility of the optical path, sunlight can also return to the surface of the TFT display module through this path. Furthermore, since the free-form mirrors in the internal optical path are concave and have a focusing effect, sunlight, passing through the free-form mirrors and flat reflectors, is ultimately focused onto the surface of the TFT display module. This light spot accumulates on the surface of the polarizer, causing damage to the polarizer, commonly known as "screen burn-in."

[0003] Chinese patent No. 202411195713.8 discloses a head-up display device and vehicle. The head-up display device includes an optical engine for emitting outgoing light in a first wavelength band; a substrate having a carrying surface; and a reflective filter element. The reflective filter element is arranged on the carrying surface and is located on the propagation path of the outgoing light in the first wavelength band. The reflective filter element is configured to reflect light in the first wavelength band and transmit light in other wavelength bands. The reflective filter element reflects red light, blue light, and green light by as much as about 72%, has a high reflectivity for red light, blue light, and green light, and has a better utilization rate of outgoing light. The reflectivity of the reflective filter element for sunlight is as low as about 28%. It can be seen that the reflective filter element can block most of the sunlight and prevent it from being reflected on the optical engine, thereby reducing the energy concentrated by sunlight backflow on the optical engine, and solving the problem of local overheating and screen burn-in caused by sunlight backflow in the head-up display device.

[0004] Although it solves the screen burn-in problem to a certain extent, the reflectivity of the transmissive filter element to sunlight is only about 28%, which makes the transmittance of sunlight higher and there is still a certain risk of screen burn-in. Summary of the Invention

[0005] The technical problem to be solved by the present invention is how to reduce the transmittance of sunlight to reduce the risk of screen burn-in.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions: To solve the above technical problems, the present invention provides a head-up display device that prevents screen burn-in caused by sunlight backflow, which includes a TFT display module and a transparent carrier. A high-transmittance and high-reflection film layer is provided on the surface of the transparent carrier. The high-transmittance and high-reflection film layer is arranged on the propagation path of the outgoing light of the TFT display module. The high-transmittance and high-reflection film layer can reflect S light with a wavelength of 400nm-780nm, and the high-transmittance and high-reflection film layer can transmit other light except S light with a wavelength of 400nm-780nm.

[0007] As a preferred embodiment of the head-up display device for preventing screen burn-in caused by backflow of sunlight provided by the present invention, the high-transmittance and high-reflection film layer is a reflective polarizing film.

[0008] As a preferred embodiment of the head-up display device for preventing screen burn-in caused by sunlight backflow provided by the present invention, the transparent carrier is glass.

[0009] As a preferred embodiment of the head-up display device for preventing screen burn-in caused by sunlight backflow provided by the present invention, the reflectivity of the high-transmittance and high-reflection film layer to S light with a wavelength of 400nm-780nm is r, where r≥95%.

[0010] As a preferred embodiment of the head-up display device for preventing screen burn-in caused by sunlight backflow provided by the present invention, the reflectivity of the high-transmittance and high-reflection film layer to S light with a wavelength of 400nm-780nm is r, where 98%≥r≥95%.

[0011] As a preferred embodiment of the head-up display device for preventing screen burn-in caused by backflow of sunlight provided by the present invention, it also includes a reflector, which is arranged on the propagation path of the reflected light of the high-transmittance and high-reflection film layer.

[0012] As a preferred embodiment of the head-up display device for preventing screen burn-in caused by backflow of sunlight provided by the present invention, it also includes an imaging device, which is arranged on the propagation path of the reflected light of the reflector.

[0013] As a preferred embodiment of the head-up display device for preventing screen burn-in caused by sunlight backflow provided by the present invention, the imaging device is a windshield.

[0014] As a preferred embodiment of the head-up display device for preventing screen burn-in caused by backflow of sunlight provided by the present invention, an ultraviolet reflection film is provided on the surface of the imaging device.

[0015] The present invention provides an automobile, comprising a head-up display device as described in any one of the above items for preventing screen burn-in caused by sunlight backflow.

[0016] The present invention has the following beneficial effects: Sunlight is roughly composed of 6% ultraviolet light, 50% visible light, and 44% infrared light. Light can be divided into S light and P light. For both S and P light, the reflectivity of infrared light, i.e., light with a wavelength greater than 780nm, in a reflector is close to zero. Therefore, the infrared light, which accounts for 44% of sunlight, will not be reflected on the surface of the TFT display module, and will not cause screen burn-in. Since the TFT display module emits S light, a high reflectivity is required to reflect the light emitted by the TFT display module onto the windshield. The transparent carrier's highly transparent and highly reflective film can reflect S light with a wavelength of 400nm-780nm, and the highly transparent and highly reflective film can transmit all light except S light with a wavelength of 400nm-780nm. Therefore, the visible light emitted by the TFT display module can be reflected by the highly transparent and highly reflective film onto the windshield. Sunlight contains P light and S light, and P light and S light each account for 50%. Therefore, 50% of the P light in the visible light passes through the high-transmittance and high-reflection film layer and the transparent carrier and will not be reflected on the surface of the TFT display module. The visible light with a wavelength of 400nm-780nm accounts for 50% of the radiation, so only 50% of the S light in the sunlight can be reflected on the surface of the TFT. Therefore, its overall radiation amount is 25%, which is greatly reduced, and can effectively prevent the burn-in problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the solutions in this application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic structural diagram of a head-up display device provided by the present invention for preventing screen burn-in caused by sunlight backflow.

[0019] Description of Figure Numbers: TFT display module 1; transparent carrier 2; high-transmittance and high-reflection film layer 3; reflector 4; imaging device 5. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions 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. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first," "second," or "third" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0023] The present invention provides a head-up display device for preventing screen burn-in caused by backflow of sunlight, which includes a TFT display module and a transparent carrier. A high-transmittance and high-reflection film layer is provided on the surface of the transparent carrier. The high-transmittance and high-reflection film layer is provided on the propagation path of the outgoing light of the TFT display module. The high-transmittance and high-reflection film layer can reflect S light with a wavelength of 400nm-780nm, and the high-transmittance and high-reflection film layer can transmit other light except the S light with a wavelength of 400nm-780nm.

[0024] Sunlight is roughly composed of 6% ultraviolet light, 50% visible light, and 44% infrared light. Light can be divided into S light and P light. For both S and P light, the reflectivity of infrared light, i.e., light with a wavelength greater than 780nm, in a reflector is close to zero. Therefore, the infrared light, which accounts for 44% of sunlight, will not be reflected on the surface of the TFT display module, and will not cause screen burn-in. Since the TFT display module emits S light, a high reflectivity is required to reflect the light emitted by the TFT display module onto the windshield. The transparent carrier's highly transparent and highly reflective film can reflect S light with a wavelength of 400nm-780nm, and the highly transparent and highly reflective film can transmit all light except S light with a wavelength of 400nm-780nm. Therefore, the visible light emitted by the TFT display module can be reflected by the highly transparent and highly reflective film onto the windshield. Sunlight contains P light and S light, and P light and S light each account for 50%. Therefore, 50% of the P light in the visible light passes through the high-transmittance and high-reflection film layer and the transparent carrier and will not be reflected on the surface of the TFT display module. The visible light with a wavelength of 400nm-780nm accounts for 50% of the radiation, so only 50% of the S light in the sunlight can be reflected on the surface of the TFT. Therefore, its overall radiation amount is 25%, which is greatly reduced, and can effectively prevent the burn-in problem.

[0025] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be understood as limiting the present invention.

[0026] Example 1, please refer to Figure 1 , a head-up display device for preventing screen burn-in caused by sunlight backflow provided by the present invention includes a TFT display module 1 and a transparent carrier 2. A high-transmittance and high-reflection film layer 3 is provided on the surface of the transparent carrier 2. The high-transmittance and high-reflection film layer 3 is provided on the propagation path of the outgoing light of the TFT display module 1. The high-transmittance and high-reflection film layer 3 can reflect S light with a wavelength of 400nm-780nm, and the high-transmittance and high-reflection film layer 3 can transmit other light except the S light with a wavelength of 400nm-780nm.

[0027] Sunlight is roughly composed of 6% ultraviolet light, 50% visible light, and 44% infrared light. Light can be divided into S light and P light. For both S and P light, the reflectivity of the infrared light band, i.e., light with a wavelength greater than 780nm, in the reflector is close to 0. Therefore, the infrared light, which accounts for 44% of the sunlight, will not be reflected onto the surface of the TFT display module 1, and will not cause screen burn-in. Since the TFT display module 1 emits S light, a higher reflectivity is required to reflect the light emitted by the TFT display module 1 onto the windshield. The highly transparent and highly reflective film layer 3 of the transparent carrier 2 can reflect S light with a wavelength of 400nm-780nm, and the highly transparent and highly reflective film layer 3 can transmit all light except the S light with a wavelength of 400nm-780nm. Therefore, the visible light emitted by the TFT display module 1 can be reflected onto the windshield by the highly transparent and highly reflective film layer 3. Sunlight contains P light and S light, and the proportion of P light and S light is 50% each. Therefore, 50% of the P light in the visible light passes through the high-transmittance and high-reflection film layer 3 and the transparent carrier 2 and will not be reflected on the surface of the TFT display module 1. The radiation proportion of visible light with a wavelength of 400nm-780nm is 50%, so only 50% of the S light in the sunlight can be reflected on the surface of the TFT. Therefore, its overall radiation amount is 25%, which is greatly reduced, and can effectively prevent the burn-in problem.

[0028] Traditional technology only reflects light in a specific band and ignores the reflection of P light, so its radiation amount is relatively high. This structure also reflects P light. Only by achieving high reflection of S light and high transmittance of P light can the imaging of the TFT display module 1 be clear and the sunlight can be reflected to the surface of the TFT display module 1 to the minimum. Therefore, the overall radiation amount can be further reduced, effectively preventing the burn-in problem.

[0029] Furthermore, the high-transmittance and high-reflection film layer 3 is a reflective polarizing film, which can be achieved by magnetron sputtering coating or by optical film lamination, and the transparent carrier 2 is glass.

[0030] Example 2, please refer to Figure 1 As a further optimization scheme of Example 1, the difference between this embodiment and Example 1 is that the reflectivity of the high-transmittance and high-reflection film layer 3 to S light with a wavelength of 400nm-780nm is r, where r ≥ 95%, more preferably, 98% ≥ r ≥ 95%, and the present embodiment further includes a reflector 4 and an imaging device 5. The reflector 4 is arranged on the propagation path of the light reflected by the high-transmittance and high-reflection film layer 3, and the imaging device 5 is arranged on the propagation path of the light reflected by the reflector 4. The imaging device 5 is a windshield, and an ultraviolet reflective film is provided on the surface of the imaging device 5.

[0031] The ultraviolet reflective film can reflect ultraviolet rays in sunlight to prevent ultraviolet rays from entering the windshield. After passing through the windshield, the sunlight is reflected by the reflector 4 and then enters the surface of the TFT display module 1 through the high-transmittance and high-reflection film layer 3 on the transparent carrier 2. Since the reflectivity of the high-transmittance and high-reflection film layer 3 to S light with a wavelength of 400nm-780nm is 95%-98%, the amount of sunlight reflected and entering the surface of the TFT display module 1 is approximately 23.75%-24.50%, which can further reduce the amount of sunlight radiation and effectively prevent the occurrence of screen burn-in problems.

[0032] The purpose of the reflector 4 is to increase the viewing distance, correct distortion and magnify the image.

[0033] The present invention provides an automobile, comprising a head-up display device as described in any one of the above items for preventing screen burn-in caused by sunlight backflow.

[0034] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] Obviously, the embodiments described above are only some of the embodiments of the present application, rather than all of the embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present application specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present application.

Claims

1. A head-up display device for preventing screen burn-in caused by sunlight backflow, characterized in that: It includes a TFT display module and a transparent carrier. A high-transmittance and high-reflection film layer is provided on the surface of the transparent carrier. The high-transmittance and high-reflection film layer is provided on the propagation path of the output light of the TFT display module. The high-transmittance and high-reflection film layer can reflect S light with a wavelength of 400nm-780nm, and the high-transmittance and high-reflection film layer can transmit other light except S light with a wavelength of 400nm-780nm.

2. The head-up display device for preventing screen burn-in caused by sunlight backflow according to claim 1, characterized in that: The high-transmittance and high-reflection film layer is a reflective polarizing film.

3. The head-up display device for preventing screen burn-in caused by sunlight backflow according to claim 1, characterized in that: The transparent carrier is glass.

4. The head-up display device for preventing screen burn-in caused by sunlight backflow according to claim 1, characterized in that: The reflectivity of the high-transmittance and high-reflection film layer to S light with a wavelength of 400nm-780nm is r, where r is ≥ 95%.

5. The head-up display device for preventing screen burn-in caused by sunlight backflow according to claim 4, characterized in that: The reflectivity of the high-transmittance and high-reflection film layer to S light with a wavelength of 400nm-780nm is r, wherein 98%≥r≥95%.

6. The head-up display device for preventing screen burn-in caused by sunlight backflow according to claim 1, characterized in that: It also includes a reflector, which is arranged on the propagation path of the reflected light of the high-transmittance and high-reflection film layer.

7. The head-up display device for preventing screen burn-in caused by sunlight backflow according to claim 6, characterized in that: It also includes an imaging device, which is arranged on the propagation path of the reflected light of the reflector.

8. The head-up display device for preventing screen burn-in caused by sunlight backflow according to claim 7, characterized in that: The imaging device is a windshield.

9. The head-up display device for preventing screen burn-in caused by sunlight backflow according to claim 7, characterized in that: An ultraviolet reflection film is provided on the surface of the imaging device.

10. An automobile, characterized in that: It includes a head-up display device for preventing screen burn-in caused by sunlight backflow as described in any one of claims 1-9.

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