Head-up display glass, head-up display system and vehicle

Abstract

The embodiment of the invention provides head-up display glass, a head-up display system and a vehicle, which can improve the permeability of a function display area of the head-up display glass and improve the visibility of a driver and passengers to the outside of the vehicle. The head-up display glass comprises a glass substrate and a functional reflecting layer, wherein the functional reflecting layer is arranged on the inner surface of the glass substrate; the head-up display glass comprises a visual field area, a function display area and a shielding area, the function display area comprises at least one semitransparent display area located between the visual field area and the shielding area, and the total visible light transmittance of the semitransparent display area is smaller than or equal to the total visible light transmittance of the visual field area and larger than the total visible light transmittance of the shielding area. At least part of the semitransparent display area is covered by the functional reflecting layer, the part, covered by the functional reflecting layer, of the semitransparent display area has main image reflectivity RL1 and auxiliary image reflectivity RL2 for projection light, and the ratio RR12 of the main image reflectivity RL1 to the auxiliary image reflectivity RL2 is larger than or equal to 15.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to a head-up display glass, a head-up display system and a vehicle. Background Art

[0002] With the development of technologies such as vehicle intelligence, automation and networking, vehicles can adopt forms such as a Head Up Display (HUD), an Augmented Reality Head-Up Display (ARHUD), an instrument panel, a center control screen, a co-pilot display screen, etc., and display various information such as vehicle information, road information, an Advanced Driver Assistance System (ADAS) and social media information in an ink shielding area on the edge of the glass, so as to provide it to the driver and passengers, and achieve multi-form and multi-level display requirements from near to far, thereby bringing a more comfortable, safe, intelligent experience and rich information to the driver and passengers. This kind of head-up display glass that performs projection display in the shielding area on the edge of the glass can also be called a black-edge display glass.

[0003] The black-edge display area of the black-edge display glass is usually located between the instrument panel surface of the vehicle and the transparent vision area of the black-edge display glass. Compared with using a traditional instrument panel to display content, the driver's line of sight can leave the road surface less, thereby greatly improving driving safety. Currently, an opaque black ink ceramic layer is usually used to form the black-edge display area of the black-edge display glass to improve the clarity of the display content on the black-edge display glass observed by the human eye, which makes the black-edge display area unable to enter the vision area B of the transparent vision area of the black-edge display glass. Moreover, during driving, the human eye's line of sight is mainly concentrated within the driving vision range, and the black-edge display area needs to be as close as possible to the driving vision range, which can improve the visibility and attention frequency of the display information. Therefore, the black-edge display area is usually set adjacent to the lower boundary of the vision area B to improve the visibility of the display information and the attention frequency of the driver and passengers to the display information. However, the black-edge display area has an opaque vertical vision, and its light permeability is poor, reducing the visibility of the outside of the vehicle for the driver and passengers and affecting the driving experience of the driver and passengers. Summary of the Invention

[0004] Embodiments of the present application provide a head-up display glass, a head-up display system and a vehicle, which can improve the permeability of the functional display area of the head-up display glass, enhance the visibility of the outside of the vehicle for the driver and passengers, and improve the driving experience of the driver and passengers.

[0005] In a first aspect, the present application provides a head-up display glass for use in a vehicle. The head-up display glass includes a glass substrate and a functional reflective layer. The glass substrate includes an inner surface, and the functional reflective layer is disposed on the inner surface and is configured to reflect projection light. The head-up display glass includes a vision area, a functional display area, and a shielding area. The functional display area includes at least one translucent display area located between the vision area and the shielding area. The total visible light transmittance of the translucent display area is less than or equal to the total visible light transmittance of the vision area and greater than the total visible light transmittance of the shielding area. At least a part of the translucent display area is covered by the functional reflective layer, and the part of the translucent display area covered by the functional reflective layer has a main image reflectivity RL 1 and a secondary image reflectivity RL 2 . The main image reflectivity RL 1 of the part of the translucent display area covered by the functional reflective layer 2 and the secondary image reflectivity RL 12 have a ratio RR

[0006] ≥ 15.

[0007] Wherein, the minimum distance H between the boundary of the vision area adjacent to the shielding area and the boundary of the translucent display area adjacent to the shielding area ranges from H ≥ 10 mm, or H ≥ 30 mm, or H ≥ 50 mm, or H ≥ 100 mm.

[0007] Wherein, the main image transmittance TL 1 of the part of the translucent display area covered by the functional reflective layer is ≥ 10%, or TL 1 ≥ 20%, or TL 1 ≥ 30%.

[0008] Wherein, the ratio TT 1 of the main image transmittance TL 2 of the part of the translucent display area covered by the functional reflective layer and the secondary image transmittance TL 12 of the translucent display area is ≥ 15.

[0009] Wherein, in the direction from the translucent display area to the vision area, the main image transmittance TL 1 of the part of the translucent display area covered by the functional reflective layer remains unchanged, or the main image transmittance TL 1 of the part of the translucent display area covered by the functional reflective layer gradually increases.

[0010] Wherein, the functional display area further includes an opaque display area located on the side of the translucent display area adjacent to the shielding area, and the total visible light transmittance of the opaque display area is less than the total visible light transmittance of the translucent display area.

[0011] Among them, the main image transmittance of the opaque display area is less than 10%.

[0012] Among them, at least part of the opaque display area is covered by the functional reflection layer.

[0013] Among them, the functional display area further includes at least one first extended display area located in the shielding area. The first extended display area is connected to the opaque display area. At least part of the first extended display area is covered by the functional reflection layer. The total visible light transmittance of the first extended display area is less than or equal to the total visible light transmittance of the opaque display area.

[0014] Among them, the ratio F of the area of the translucent display area to the area of the functional display area is 10% ≤ F ≤ 100%.

[0015] Among them, the ratio Q of the total visible light transmittance of the part of the translucent display area covered by the functional reflection layer to the total visible light transmittance of the adjacent viewing area is 0.3 ≤ Q ≤ 1, or 0.5 ≤ Q ≤ 1, or 0.8 ≤ Q ≤ 1, or 0.9 ≤ Q ≤ 1.

[0016] Among them, the functional reflection layer has an S-polarized light reflectivity R for S-polarized light S , and the functional reflection layer has a P-polarized light reflectivity R for P-polarized light p , and the P-polarized light reflectivity R P is less than the S-polarized light reflectivity R S .

[0017] Among them, the ratio K of the S-polarized light reflectivity R S to the P-polarized light reflectivity R P is ≥ 1.5.

[0018] Among them, when the projection light is incident on the functional reflection layer at an incident angle of 70°, the S-polarized light reflectivity R S ≥ 40%, and the P-polarized light reflectivity R P < 40%.

[0019] Among them, when the projection light is incident on the functional reflection layer at an incident angle of 70°, the deviation degree ΔDs of the reflectivity of the functional reflection layer for the S-polarized light with a wavelength of 400 nm to 700 nm is ΔDs ≤ 3%, or ΔDs ≤ 2%, or ΔDs ≤ 1%.

[0020] Wherein, when the projection light is incident on the functional reflection layer at an incident angle of 70°, the deviation ΔDp of the reflectivity of the functional reflection layer for the P-polarized light with a wavelength of 400 nm to 700 nm is ΔDp ≤ 3%, or ΔDp ≤ 2%, or ΔDp ≤ 1%.

[0021] Wherein, the functional display area further includes at least one second extended display area located in the viewing area, the second extended display area is connected to the semi-transparent display area, at least a part of the second extended display area is covered by the functional reflection layer, and the total visible light transmittance of the second extended display area is greater than or equal to the total visible light transmittance of the semi-transparent display area.

[0022] Wherein, the functional reflection layer has an S-polarized light reflectivity R S for S-polarized light, and the functional reflection layer has a P-polarized light reflectivity R p for P-polarized light, and the P-polarized light reflectivity R P is less than the S-polarized light reflectivity R S . When the projection light is incident on the part of the second extended display area covered by the functional reflection layer at an incident angle of 65°, the S-polarized light reflectivity R S ≥ 55%, and the P-polarized light reflectivity R P ≤ 15%.

[0023] Wherein, the refractive index n of the functional reflection layer is ≥ 1.7.

[0024] Wherein, the functional reflection layer is a sol-gel coating.

[0025] Wherein, the material of the functional reflection layer includes at least one of silicon nitride, silicon-metal-hybrid nitride, aluminum nitride, gallium nitride, titanium nitride, tin oxide, manganese oxide, tungsten oxide, niobium oxide, bismuth oxide, titanium oxide, tin-zinc-hybrid oxide, zirconium oxide, scandium oxide, yttrium oxide, tantalum oxide, lanthanum oxide, cerium oxide, tellurium oxide, aluminum oxide, silicon oxide, zinc oxide, indium oxide or transition metal oxide.

[0026] Wherein, the glass substrate includes an outer sheet of glass, an inner sheet of glass and an intermediate layer. Along the thickness direction of the glass substrate, the outer sheet of glass and the inner sheet of glass are spaced apart and oppositely arranged, and the intermediate layer is located between the outer sheet of glass and the inner sheet of glass; the head-up display glass further includes a functional layer, and the functional layer is disposed between the outer sheet of glass and the intermediate layer, or the functional layer is disposed between the intermediate layer and the inner sheet of glass.

[0027] Wherein, the main image reflectivity RL 1 is the reflectivity of the first reflection of the S-polarized light by the functional reflection layer, and the sub-image reflectivity RL 2The reflectivity of the secondary reflection of the S-polarized light that enters the inside of the head-up display glass through the functional reflection layer.

[0028] In a second aspect, the present application further provides a head-up display system, including a projection device and the head-up display glass as described in any one of the above. The projection device is located on the side of the head-up display glass facing the inside of the vehicle, and the projection device is used to emit the projection light.

[0029] Among them, the projection light includes S-polarized light and P-polarized light. Among them, the proportion of the S-polarized light in the projection light is greater than or equal to 70% and less than or equal to 100%.

[0030] Among them, the projection light forms a projection image in the semi-transparent display area. Along the direction of the connection line between the center of the projection image and the observation position, the distance between the projection image and the surface of the head-up display glass facing the outside of the vehicle is less than or equal to 1 m.

[0031] In a third aspect, the present application further provides a vehicle, including a vehicle body and the head-up display system as described in any one of the above. The head-up display glass is installed at the opening of the vehicle body, and the projection device is installed inside the vehicle body.

[0032] The head-up display glass provided by the present application, by setting a semi-transparent display area between the vision area and the shielding area, and making the ratio RR12 of the main image reflectivity RL1 and the secondary image reflectivity RL2 of the part of the semi-transparent display area covered by the functional reflection layer ≥ 15, can make the semi-transparent display area in a semi-transparent state. On the one hand, it can improve the light permeability of the functional display area of the head-up display glass, thereby improving the visibility of the vehicle occupants to the outside of the vehicle and enhancing the driving experience of the vehicle occupants. On the other hand, it can also increase the vertical display range of the head-up display glass, thereby increasing the visible field of view and safety redundancy, improving the safety performance of the vehicle, and ensuring the driving safety of the vehicle occupants. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments of the present application will be described below.

[0034] Figure 1 It is a schematic structural diagram of the vehicle provided by the present application;

[0035] Figure 2 It is Figure 1 The schematic cross-sectional structural diagram of the head-up display system in the first embodiment in the vehicle shown;

[0036] Figure 3 It is Figure 2 The schematic structural diagram of the head-up display glass in the head-up display system shown;

[0037] Figure 4 is Figure 3 The schematic cross-sectional structure diagram after the head-up display glass shown is cut along the A-A line;

[0038] Figure 5 is Figure 4 The schematic optical path diagram of the semi-transparent display area in the head-up display glass shown;

[0039] Figure 6 The schematic diagram of the projection light forming a projection image on the head-up display glass;

[0040] Figure 7 is Figure 1 The schematic cross-sectional structure diagram of the head-up display system in the vehicle shown in the second embodiment;

[0041] Figure 8 is Figure 7 The schematic structure diagram of the head-up display glass in the head-up display system shown;

[0042] Figure 9 is Figure 8 The schematic cross-sectional structure diagram after the head-up display glass shown is cut along the B-B line;

[0043] Figure 10 is Figure 1 The schematic cross-sectional structure diagram of the head-up display glass of the head-up display system in the vehicle 1000 shown in the third embodiment.

[0044] Figure 11 is Figure 1 The schematic cross-sectional structure diagram of the head-up display glass of the head-up display system in the vehicle shown in the fourth embodiment;

[0045] Figure 12 is Figure 4 The simulated curve graph of the reflectivity and transmittance indexes of the head-up display glass shown;

[0046] Figure 13 is the projection light incident on Figure 9 The curve graph of the S-polarized light reflectivity and P-polarized light reflectivity of the functional reflection layer in the head-up display glass shown;

[0047] Figure 14 The relative emission spectrum curve graph of the light sources of two displays.

[0048] The names corresponding to the reference numerals in the figure are:

[0049] Vehicle 1000, vehicle body 200, head-up display system 100, head-up display glass 120, projection device 110, projection light 111, field of view area 121, function display area 122, shielding area 123, semi-transparent display area 122a, external light source 2000a, natural light 2000, glass substrate 10, function reflection layer 20, inner surface 10a, outer surface 10b, outer sheet glass 11, inner sheet glass 12, intermediate layer 13, light barrier layer 14, first surface 101, second surface 102, third surface 103, fourth surface 104, projected image 111a, opaque display area 122b, first sub-portion 141, second sub-portion 142, first part 21, second part 22, third part 23, first extended display area 122d, second extended display area 122c. Detailed implementation

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

[0051] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of the vehicle 1000 provided by the present application, Figure 2 is Figure 1 a schematic cross-sectional structural diagram of the head-up display system 100 in the vehicle 1000 shown in the first embodiment.

[0052] The embodiments of the present application provide a vehicle 1000. The vehicle 1000 may be, but is not limited to, a sedan, a multi-purpose vehicle (MPV), a sport utility vehicle (SUV), an off-road vehicle (ORV), a pickup truck, a minivan, a bus, a truck, etc.

[0053] In this embodiment, the vehicle 1000 includes a vehicle body 200 and a head-up display system 100, and the head-up display system 100 is installed on the vehicle body 200. Specifically, the head-up display system 100 includes a head-up display glass 120 and a projection device 110. Among them, the head-up display glass 120 is installed at the opening of the vehicle body 200. Exemplarily, the head-up display glass 120 is the front windshield of the vehicle 1000. In some other embodiments, the head-up display glass 120 may also be a rear windshield, a side window glass, or a corner window glass, etc., and the embodiments of the present application do not make strict restrictions on this.

[0054] The projection device 110 is located on the side of the head-up display glass 120 facing the interior of the vehicle 1000 and is installed inside the vehicle body 200. Among them, the projection device 110 can be a projector or a display screen. For example, the projection device 110 can be a projector, a thin film transistor display (TFT), an organic light-emitting diode display (OLED), a liquid crystal on silicon display (LCOS), a digital light processing display (DLP), a mini light-emitting diode display (Mini LED), or a micro light-emitting diode display (MicroLED), etc. The projection device 110 is used to emit projection light 111.

[0055] In this embodiment, the projection light 111 includes S-polarized light and P-polarized light. Among them, the proportion of S-polarized light in the projection light 111 is greater than or equal to 70% and less than or equal to 100%. For example, the proportion of S-polarized light in the projection light 111 is greater than or equal to 80%. In some other embodiments, the proportion of S-polarized light in the projection light 111 is greater than or equal to 90%. In another embodiment, the proportion of S-polarized light in the projection light 111 is greater than or equal to 99%. In this setting, on the one hand, the proportion of P-polarized light in the projection light 111 can be reduced, thereby reducing the power consumption efficiency of the head-up display system 100. On the other hand, the reflected stray light of the projection light 111 can be reduced, avoiding interference of the reflected stray light with the display information of the head-up display system 100.

[0056] It should be understood that since the head-up display glass 120 is inclined towards the driver and passenger side, the projection light 111 usually enters the head-up display glass 120 at an incident angle of 65° to 75°. Among them, the incident angle θ refers to the angle between the projection light 111 and the normal. The projection light 111 enters the head-up display glass 120, and the head-up display glass 120 reflects the projection light 111 into the driver and passenger's eyes to form a display image, so that the driver and passenger can observe the display image without lowering their heads, enabling the driver and passenger to have a better field of vision and keep their line of sight for a longer time to observe the real-time situation outside the vehicle 1000. At the same time, it can more easily obtain necessary information for assisted driving such as driving information and road information, greatly improving driving safety.

[0057] In addition, the vehicle 1000 further includes an instrument panel (not shown in the figure). The instrument panel is installed on the vehicle body 200 and is located on the side of the head-up display glass 120 facing the interior of the vehicle 1000. An absorbing layer (not shown in the figure) is provided on the side of the instrument panel facing the head-up display glass 120. Among them, the absorbing layer can be at least one of rayon base cloth, nylon fluff, polyurethane film layer, polyethylene terephthalate (PET) film, acrylic film layer, polyethylene film layer, carbon nanotube film layer or matte ink layer. In this embodiment, by providing a black silk absorbing layer on the instrument panel of the vehicle 1000, the reflected stray light entering the head-up display glass 120 from outside the vehicle 1000 can be reduced, preventing the reflected stray light from interfering with the displayed image on the head-up display glass 120 and ensuring good imaging effect of the head-up display glass 120.

[0058] Please refer to Figure 3 、 Figure 4 and Figure 5 , Figure 3 is Figure 2 the schematic structural diagram of the head-up display glass 120 in the head-up display system 100 shown in Figure 4 is Figure 3 the schematic cross-sectional structural diagram of the head-up display glass 120 after being cut along the A-A position shown in Figure 5 is Figure 4 the schematic optical path diagram of the semi-transparent display area 122a in the head-up display glass 120 shown in . Among them, "being cut along the A-A position" means being cut along the plane where the A-A line is located, and the same understanding can be made for similar descriptions hereinafter.

[0059] The head-up display glass 120 includes a glass substrate 10 and a functional reflection layer 20. Among them, the glass substrate 10 includes an inner surface 10a facing the interior of the vehicle 1000 and an outer surface 10b facing the exterior of the vehicle 1000. In this embodiment, the functional reflection layer 20 is provided on the inner surface 10a. The functional reflection layer 20 is used to project light rays 111 so that the projected light rays 111 are reflected into the eyes of the driver and passengers to form display information.

[0060] Specifically, the head-up display glass 120 has a viewing area 121, a functional display area 122 and a shielding area 123. Among them, the driver and passengers observe the external environment of the vehicle 1000 through the viewing area 121. It should be understood that according to regulations GB9656 or ECE R43, the viewing area 121 at least includes the viewing area B. The opaque shielding objects on the head-up display glass 120 shall not intrude into the viewing area B to prevent interfering with the line of sight of the driver and passengers. In some other embodiments, the viewing area 121 may also include the viewing area B minus area. In this embodiment, the shielding area 123 is arranged around the viewing area 121. The shielding area 123 can play roles such as shielding, protecting and enhancing the overall aesthetic appearance of the vehicle 1000.

[0061] The function display area 122 is located between the visual field area 121 and the shielding area 123. Among them, at least part of the function reflection layer 20 is located in the function display area 122. The projection light 111 emitted by the projection device 110 is reflected in the function display area 122 and forms projection information observable by the human eye. In this embodiment, the function display area 122 can be centrally arranged on one side of the head-up display glass 120 close to the instrument panel of the vehicle 1000, such as Figure 2 shown. In some other embodiments, the function display area 122 can also be dispersedly arranged on the periphery of the head-up display glass 120. For example, a part of the function display area 122 can be arranged on one side of the head-up display glass 120 close to the instrument panel of the vehicle 1000, a part of the function display area 122 can also be arranged near the rearview mirror of the vehicle 1000 on the head-up display glass 120, and a part of the function display area 122 can also be arranged on one side of the head-up display glass 120 close to the pillar glass of the vehicle 1000.

[0062] The function display area 122 includes at least one translucent display area 122a located between the visual field area 121 and the shielding area 123. The translucent display area 122a is connected to the visual field area 121. Among them, at least part of the function reflection layer 20 covers the part of the inner surface 10a located in the translucent display area 122a. It should be noted that the translucent display area 122a refers to a perspective area with a certain visibility and recognition degree of the vehicle exterior state.

[0063] In this embodiment, the ratio F of the area of the translucent display area 122a to the area of the function display area 122 is 10% ≤ F ≤ 100%. In this embodiment, the ratio F of the area of the translucent display area 122a to the area of the function display area 122 is 100%. In some other embodiments, the ratio F of the area of the translucent display area 122a to the area of the function display area 122 is 80%, 60%, 40%, 30%, 20% or 10%. It should be noted that in the actual production process, the proportion of the area of the translucent display area 122a to the area of the function display area 122 can be designed according to the actual required visual field range and other requirements of the vehicle 1000.

[0064] In this embodiment, the minimum distance H between the boundary of the semi-transparent display area 122a close to the shielding area 123 and the boundary of the visual field area 121 close to the shielding area 123 ranges from H≥10mm, or H≥30mm, or H≥50mm, or H≥100mm. With this setting, on the one hand, it can prevent the functional display area 122 from invading the visual field area B of the visual field area 121, thereby reducing the interference of projection information on the line of sight of the driver and passengers. On the other hand, it can also ensure that the semi-transparent display area 122a of the functional display area 122 is as close as possible to the visual field area B of the visual field area 121, which can not only enhance the visibility of the projection information on the functional display area 122, but also increase the attention frequency of the driver and passengers to the projection information on the functional display area 122. At the same time, it can also increase the visible range of the head-up display glass 120, increase the visible field of view and safety redundancy, improve the safety performance of the vehicle 1000, and contribute to ensuring the driving safety of the driver and passengers.

[0065] The semi-transparent display area 122a can be used to reflect the incident projection light 111 to form a display image. The display image can display the driving information of the vehicle 1000, various patterns or play videos, etc., and can be used in various scenarios such as welcoming guests, creating an atmosphere, watching movies and working. Specifically, the display image is used to display driving parameters, including vehicle speed, engine speed, fuel consumption, tire pressure, warning information, driving mileage, etc., and can also be used to display weather temperature, entertainment information, and can also be used as dynamic navigation, night vision, real scene map, etc. At the same time, the driver and passengers can also observe the external environment of the vehicle 1000 through the semi-transparent display area 122a.

[0066] The natural light 2000 emitted by the external light source 2000a of the vehicle 1000 passes through the semi-transparent display area 122a of the head-up display glass 120 after two refractions and enters the human eye, and forms a transmitted main image in the human eye. At this time, the visible light transmittance of the transmitted main image is denoted as the main image transmittance TL 1 . Among them, the main image transmittance TL 1 is measured and calculated using a spectrophotometer with reference to the standard ISO9050. At the same time, the natural light 2000 emitted by the external light source 2000a of the vehicle 1000 will also enter the interior of the head-up display glass 120, and undergo two refractions and two reflections, and then enter the human eye to form a transmitted double image. At this time, the visible light transmittance of the transmitted double image is denoted as the secondary image transmittance TL 2 . It can also be understood that the semi-transparent display area 122a has a main image transmittance TL 1 and a secondary image transmittance TL 2 for the natural light 2000 outside the vehicle 1000.

[0067] In this embodiment, the total visible light transmittance of the semi-transparent display area 122a is less than or equal to the total visible light transmittance of the vision area 121 and greater than the total visible light transmittance of the shielding area 123. It should be noted that the value of the total visible light transmittance can be approximately equal to the main image transmittance TL 1 and the sub-image transmittance TL 2 The sum is the same for the following similar descriptions. Among them, the main image transmittance TL of the part of the semi-transparent display area 122a covered by the functional reflection layer 20 1 is greater than or equal to 10%. Under this setting, the semi-transparent display area 122a can be in a semi-transparent state. On the one hand, it can improve the light permeability of the functional display area 122 of the head-up display glass 120, thereby improving the visibility of the vehicle exterior for the driver and passengers and enhancing their driving experience. On the other hand, it can also increase the vertical display range of the head-up display glass 120, thereby increasing the visible field of view and safety redundancy and improving the safety performance of the vehicle 1000 to ensure the driving safety of the driver and passengers. In addition, in the direction from the semi-transparent display area 122a to the vision area 121, the main image transmittance TL of the part of the semi-transparent display area 122a covered by the functional reflection layer 20 1 remains unchanged, or the main image transmittance TL of the part of the semi-transparent display area 122a covered by the functional reflection layer 20 1 gradually increases. In some further embodiments, the main image transmittance TL 1 can also be greater than or equal to 20%, and even the main image transmittance TL 1 can be greater than or equal to 30%, so that a clearer view of the vehicle exterior can be obtained. Specifically, the main image transmittance TL of the part of the semi-transparent display area 122a covered by the functional reflection layer 20 1 can be set to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc. It can be understood that since the main image transmittance TL 1 cannot be actively adjusted, but needs to be indirectly adjusted by controlling other relevant factors, the value of the main image transmittance TL in actual situations 1 can be any value near the above values, and the present application does not make specific limitations on this.

[0068] In this embodiment, the main image transmittance TL of the part of the semi-transparent display area 122a covered by the functional reflection layer 20 1 is greater than the sub-image transmittance TL of the part of the semi-transparent display area 122a covered by the functional reflection layer 20 2 . Among them, the main image transmittance TL of the part of the semi-transparent display area 122a covered by the functional reflection layer 20 1 and the sub-image transmittance TL of the part of the semi-transparent display area 122a covered by the functional reflection layer 20 2Ratio TT 12 ≥15. Under this setting, the transmitted main image formed by the natural light 2000 in the human eye can be made clearer, while making the transmitted double image formed by the natural light 2000 in the human eye relatively dim, so that the information outside the vehicle observed by the driver and passengers through the translucent display area 122a is clearer. Furthermore, it is also beneficial to improve the visibility of the information about the external environment of the vehicle for the driver and passengers, improve the safety performance of the vehicle 1000, and ensure the driving safety of the driver and passengers.

[0069] In addition, the ratio Q of the total visible light transmittance of the part of the translucent display area 122a covered by the functional reflection layer 20 to the total visible light transmittance of the adjacent vision area 121 is 0.3 ≤ Q ≤ 1. In some other embodiments, the ratio Q of the total visible light transmittance of the part of the translucent display area 122a covered by the functional reflection layer 20 to the total visible light transmittance of the adjacent vision area 121 is 0.5 ≤ Q ≤ 1, or, 0.8 ≤ Q ≤ 1, or, 0.9 ≤ Q ≤ 1. Under this setting, the transparency of the translucent display area 122a and the transparency of the vision area 121 can be made to transition smoothly without obvious fluctuations, thus helping to improve the visual effect of the driver and passengers observing the information outside the vehicle through the head-up display glass 120 and enhancing the driving experience of the driver and passengers.

[0070] Please continue to refer to Figure 5 . The projection light 111 emitted by the projection device 110 is reflected once in the translucent display area 122a and then enters the human eye, forming a reflected main image in the human eye. At this time, the visible light reflectivity of the reflected main image is denoted as the main image reflectivity RL 1 . At the same time, since the translucent display area 122a is in a translucent state, the projection light 111 will also enter the interior of the head-up display glass 120, undergo two refractions and one reflection in sequence, and then enter the human eye to form a reflected ghost. At this time, the visible light reflectivity of the reflected ghost is denoted as the secondary image reflectivity RL 2 . It can be understood that the part of the translucent display area 122a covered by the functional reflection layer 20 has a main image reflectivity RL 1 and a secondary image reflectivity RL 2 . The main image reflectivity RL 1 is greater than the secondary image reflectivity RL 2 . Among them, the main image reflectivity RL 1 and the secondary image reflectivity RL 2 of the part of the translucent display area 122a covered by the functional reflection layer 12 ≥15. Among them, the main image reflectivity RL 1 is the reflectivity of the first reflection of the functional reflection layer on the S-polarized light, and the secondary image reflectivity RL 2Is the reflectivity of the secondary reflection of the S-polarized light that enters the head-up display glass through the functional reflection layer. It should be understood that in the embodiments of the present application, the projection light mainly uses S-polarized light. Therefore, in the embodiments of the present application, the main image reflectivity RL 1 Refers to the reflectivity of the first reflection of the S-polarized light on the inner surface of the head-up display glass. The secondary image reflectivity RL 2 Refers to the reflectivity of the S-polarized light that enters the head-up display glass and undergoes secondary reflection. Further, since in the embodiments of the present application, the main image reflectivity RL 1 Refers to the reflectivity of the first reflection of the S-polarized light on the inner surface of the head-up display glass. Therefore, in other embodiments of the present application, for the head-up display glass provided with the functional reflection layer, the reflectivity R of the S-polarized light S Is the main image reflectivity RL 1 , In other words, in the embodiments of the present application, the S-polarized light reflectivity R S Is equal to the main image reflectivity RL 1 .

[0071] In other embodiments that are not exclusive to the embodiments shown in the present application, the reflectivity R of the functional reflection layer for the S-polarized light S And the main image reflectivity RL 1 May also not be equal. In addition, in other embodiments that are not exclusive to the embodiments shown in the present application, a mixed polarized light mainly composed of S-polarized light can also be used as the projection light. Therefore, in other embodiments, the main image reflectivity RL 1 And the secondary image reflectivity RL 2 May also refer to the reflectivity of the first reflection of the mixed polarized light mainly composed of S-polarized light on the inner surface of the head-up display glass, and the reflectivity of the secondary reflection after entering the head-up display glass.

[0072] Under this setting, the reflected main image formed by the projection light 111 in the human eye can be made clearer, while the reflected ghost image formed by the projection light 111 in the human eye is relatively dim. Thus, the image and other information presented in the semi-transparent display area 122a of the head-up display glass 120 are clear, preventing the driver and passengers from being interfered by the reflected ghost image and improving the driving experience and driving safety of the driver and passengers.

[0073] It should be noted that when the ratio RR 1 Of the main image reflectivity RL 2 And the secondary image reflectivity RL 12 Of the part of the semi-transparent display area 122a covered by the functional reflection layer 20 is ≥15, the main image transmittance TL 1 Of the part of the semi-transparent display area 122a covered by the functional reflection layer 20 is much greater than the secondary image transmittance TL 2At this time, the main image transmittance TL of the portion of the semi-transmissive display region 122a covered by the functional reflective layer 20 1 can be approximately regarded as the total visible light transmittance of the semi-transmissive display region 122a.

[0074] In addition, in some embodiments, the ratio RR of the main image reflectance RL1 to the sub-image reflectance RL of the portion of the semi-transmissive display region 122a covered by the functional reflective layer 20 2 is 12 also RR 12 ≥20, further it can be RR 12 ≥30, also it can be RR 12 ≥40, or RR 12 ≥50. Without considering other factors, theoretically, the larger the ratio of the main image reflectance RL 1 to the sub-image reflectance RL 2 , the better the display effect.

[0075] Please continue to refer to Figure 4 . The glass substrate 10 includes an outer sheet glass 11, an inner sheet glass 12, an intermediate layer 13, and a light barrier layer 14. Along the thickness direction of the glass substrate 10, the outer sheet glass 11 and the inner sheet glass 12 are spaced apart and oppositely arranged. Among them, the surface of the inner sheet glass 12 facing away from the outer sheet glass 11 is the inner surface 10a. The intermediate layer 13 is located between the outer sheet glass 11 and the inner sheet glass 12. The light barrier layer 14 is provided on the surface of the outer sheet glass 11 facing the inner sheet glass 12 and is located in the shielding area 123.

[0076] Specifically, the outer sheet glass 11 includes a first surface 101 and a second surface 102. Along the thickness direction of the outer sheet glass 11, the first surface 101 and the second surface 102 are oppositely arranged. Among them, the first surface 101 of the outer sheet glass 11 is the outer surface 10b of the glass substrate 10. The inner sheet glass 12 includes a third surface 103 and a fourth surface 104. Along the thickness direction of the inner sheet glass 12, the third surface 103 and the fourth surface 104 are oppositely arranged. Among them, the third surface 103 faces the second surface 102. The fourth surface 104 is the inner surface 10a of the glass substrate 10. The light barrier layer 14 is provided on the second surface 102 of the outer sheet glass 11. Among them, at least part of the light barrier layer 14 is located in the shielding area 123.

[0077] The intermediate layer 13 is connected between the second surface 102 and the fourth surface 104. In this embodiment, the intermediate layer 13 can be a single thermoplastic polymer film or can be formed by laminating two or more thermoplastic polymer films. The material of the thermoplastic polymer film is selected from at least one of polyvinyl butyral (PVB), polyurethane (PU), ethylene-vinyl acetate copolymer (EVA), and ionomer (SGP). It should be noted that when the intermediate layer 13 includes two or more thermoplastic polymer films, the two or more thermoplastic polymer films can be of the same or different materials to meet the needs of different scenarios.

[0078] It should be noted that during the production process, according to actual requirements, by adjusting the structure and material of the glass substrate 10, etc., the main image transmittance TL of the semi-transparent display area 122a can be adjusted. 1 , so that the main image transmittance TL of the semi-transparent display area 122a 1 is greater than or equal to 10%.

[0079] In a possible implementation, the intermediate layer 13 can be used to adjust the main image transmittance TL of the semi-transparent display area 122a. 1 . For example, the intermediate layer 13 can be made of a colored film layer or a gradient colored film layer, or a colored sheet or a gradient colored sheet can be embedded in the intermediate layer 13 to change the coloring components and proportions of the intermediate layer 13, thereby realizing the adjustment of the main image transmittance TL of the semi-transparent display area 122a. 1 . Another example is that the intermediate layer 13 can be made of a polymer film with surface printed ink, paint or pigment.

[0080] In a possible implementation, the main image transmittance TL of the semi-transparent display area 122a can be adjusted by dyeing or coloring the first surface 101, the second surface 102, the third surface 103 or the fourth surface 104. 1 In a possible implementation, the main image transmittance TL of the semi-transparent display area 122a can also be realized by using the inner sheet glass 12 with its own dark coloring. 1 In a possible implementation, the reflectance of the functional reflection layer 20 to the projection light 111 can also be changed or a functional reflection layer 20 with its own coloring can be used to realize the adjustment of the main image transmittance TL of the semi-transparent display area 122a. 1 .

[0081] In a possible implementation, a dimming film can be provided in the glass substrate 10 to realize the adjustment of the main image transmittance TL of the semi-transparent display area 122a. 1The dimming film can be a polymer dispersed liquid crystal film (PDLC), a suspended particle film (SPD), an electrochromic film (EC), a dye liquid crystal film (LC), etc. The maximum visible light transmittance of the dimming film can be set according to actual production needs. For example, the maximum visible light transmittance of the dimming film can be 50%, 70%, 80%, 90%, etc. Exemplarily, when the head-up display glass 120 needs to display information such as images, the maximum visible light transmittance of the dimming film can be 90% so that the dimming film is in a high visible light transmittance state, thereby enabling the head-up display glass 120 to have a larger transparent area.

[0082] In a possible implementation, the head-up display glass 120 further includes a functional layer (not shown in the figure). Specifically, the functional layer is disposed between the outer glass 11 and the intermediate layer 13, or the functional layer is disposed between the intermediate layer 13 and the inner glass 12. Among them, the functional layer can be a transparent heating conductive film layer or a heat insulation film layer, and the embodiments of the present application do not make any restrictions on this.

[0083] In this embodiment, the functional reflection layer 20 is disposed on the fourth surface 104 of the inner glass 12. Among them, the part of the functional reflection layer 20 located in the semi-transparent display area 122a can have a hollow pattern to achieve a gradual change in visible light transmittance, so as to make it more comfortable for the driver and passengers to visually observe.

[0084] In this embodiment, the refractive index n of the functional reflection layer 20 is n≥1.7. In some other embodiments, the refractive index n of the functional reflection layer 20 is n≥2, or the refractive index n of the functional reflection layer 20 is n≥2.2, or the refractive index n of the functional reflection layer 20 is n≥2.4, or the refractive index n of the functional reflection layer 20 is n≥2.6, or the refractive index n of the functional reflection layer 20 is n≥3. In this embodiment, the functional reflection layer 20 can be made of a non-metallic transparent film layer. Among them, the material of the functional reflection layer 20 includes at least one of silicon nitride, silicon-metal-hybrid nitride, aluminum nitride, gallium nitride, titanium nitride, tin oxide, manganese oxide, tungsten oxide, niobium oxide, bismuth oxide, titanium oxide, tin-zinc-hybrid oxide, zirconium oxide, scandium oxide, yttrium oxide, tantalum oxide, lanthanum oxide, cerium oxide, tellurium oxide, aluminum oxide, silicon oxide, zinc oxide, indium oxide, or transition metal oxides. Exemplarily, the functional reflection layer 20 is a sol-gel coating.

[0085] In this embodiment, the functional reflection layer 20 has an S-polarized light reflectivity R for the S-polarized light of the projection light 111 S , and the functional reflection layer 20 has a P-polarized light reflectivity R for the P-polarized light of the projection light 111 p . The S-polarized light reflectivity R S is greater than the P-polarized light reflectivity R P , and the S-polarized light reflectivity R SThe ratio K with the P-polarized light reflectivity R P is K≥1.5. Preferably, K≥5, or K≥5, or K≥10, or K≥30, or K≥50. When the projection light 111 is incident on the functional reflection layer 20 at an incident angle of 70°, the S-polarized light reflectivity R S ≥40%. Preferably, the S-polarized light reflectivity R S ≥50%, or the S-polarized light reflectivity R S ≥60%, or the S-polarized light reflectivity R S ≥70%. The P-polarized light reflectivity R P <40%. Preferably, the P-polarized light reflectivity R P ≤20%, or the P-polarized light reflectivity R P ≤10%, or the P-polarized light reflectivity R P ≤5%, or the P-polarized light reflectivity R P ≤1%. It should be noted that the wavelength ranges of the above S-polarized light and P-polarized light are both 380 nm to 780 nm.

[0086] Under this setting, on the one hand, the functional reflection layer 20 can achieve high reflection of S-polarized light, enhancing the brightness and recognition of the display content in the semi-transparent display area 122a. On the other hand, the functional reflection layer 20 can achieve low reflection of P-polarized light, reducing the overall power consumption of the head-up display system 100 and the cost. At the same time, it can also enhance the permeability of the semi-transparent display area 122a and the visibility of the vehicle exterior environment for the driver and passengers, improving the driving experience and driving safety of the driver and passengers.

[0087] In this embodiment, the projection light 111 emitted by the projection device 110 is incident on the functional reflection layer 20 and forms a projection image in the semi-transparent display area 122a. It should be understood that the color of the projection light 111 emitted by the projection device 110 is mixed by the RGB three primary colors, and what the human eye sees is the projection image reflected by the functional reflection layer 20. To avoid color deviation of the projection image (such as turning red or blue, etc.) and to facilitate the matching of the color of the projection light 111 emitted by the projection device 110 with the functional reflection layer 20 for display calibration, the reflectivity curve of the functional reflection layer 20 in the visible light band should preferably change linearly. The absolute value of the maximum deviation amount between the reflectivity at each interval band (the interval band is 5 nm) within the established band range and the linear regression line within each interval band in this range is defined as the reflectivity deviation ΔD. When the projection light 111 is incident on the functional reflection layer 20 at an incident angle of 70°, the reflectivity deviation ΔD of the functional reflection layer 20 for S-polarized light with wavelengths from 400 nm to 700 nm sis ΔDs≤3%, or ΔDs≤2%, or ΔDs≤1%. When the projection light 111 is incident on the functional reflective layer 20 at an incident angle of 70°, the reflectance deviation ΔD of the functional reflective layer 20 for P-polarized light with a wavelength of 400 nm to 700 nm p is ΔDp≤3%, or ΔDp≤2%, or ΔDp≤1%. Under this setting, the head-up display glass 120 can be adapted to a variety of projection devices 110, so that the head-up display system 100 can have a higher display color gamut coverage range.

[0088] In addition, the head-up display glass 120 further includes an electric heating element (not shown in the figure) and a wire (not shown in the figure). The electric heating element is disposed on the surface of the outer glass 11 facing the inner glass 12, or the electric heating element is disposed on the surface of the inner glass 12 facing the outer glass 11. The electric heating element is used to heat the functional display area 122. In this embodiment, the electric heating element can be a metal wire, a copper foil, a silver paste, or a transparent conductive metal film, etc., to achieve heating the functional display area 122. The wire is electrically connected between the electric heating element and the power supply of the vehicle 1000.

[0089] Please refer to Figure 6 , Figure 6 is a schematic diagram of the projection light 111 forming a projection image 111a on the head-up display glass 120.

[0090] In this embodiment, the projection light 111 emitted by the projection device 110 is incident on the functional reflective layer 20 and forms a projection image 111a in the semi-transparent display area 122a. When the human eye observes the projection image 111a, the position where the human eye is located is the observation position 3000. Along the direction of the line connecting the center of the projection image 111a and the observation position 3000, the distance between the projection image 111a and the surface of the head-up display glass 120 facing the outside of the vehicle 1000 is less than or equal to 1 m. That is, along the direction of the line connecting the center of the projection image 111a and the observation position 3000, the distance between the projection image 111a and the outer surface 10b is less than or equal to 1 m. Preferably, along the direction of the line connecting the center of the projection image 111a and the observation position 3000, the distance between the projection image 111a and the outer surface 10b is less than or equal to 0.5 m, or the distance between the projection image 111a and the outer surface 10b is less than or equal to 0.3 m, or the distance between the projection image 111a and the outer surface 10b is less than or equal to 0.2 m.

[0091] Under this setting, it can be ensured that the projection image 111a does not exceed the front of the vehicle and is near the surface of the hood of the vehicle 1000, which can avoid unreasonable states such as the projection image 111a looking too deep into the engine compartment of the vehicle 1000, and ensure the authenticity of the projection image 111a. At the same time, it can also reduce the superimposed interference caused by factors such as the road surface, the vehicle 1000 ahead or the irregular shape of the rear end of the hood, thereby helping to enhance the visibility of the vehicle exterior environment for the driver and passengers, and improving the driving experience and driving safety of the driver and passengers.

[0092] Please refer to Figure 7 、 Figure 8 and Figure 9 , Figure 7 is Figure 1 the schematic cross-sectional structure diagram of the head-up display system 100 in the vehicle 1000 shown in the second embodiment, Figure 8 is Figure 7 the schematic structure diagram of the head-up display glass 120 in the head-up display system 100 shown in Figure 9 is Figure 8 the schematic cross-sectional structure diagram of the head-up display glass 120 after being cut along the B-B position shown in

[0093] The difference between the head-up display glass 120 shown in this embodiment and the head-up display glass 120 shown in the above first embodiment is that the function display area 122 further includes an opaque display area 122b. The opaque display area 122b is located on the side of the translucent display area 122a close to the shielding area 123. Among them, at least part of the opaque display area 122b is covered by the function reflection layer 20.

[0094] In this embodiment, the total visible light transmittance of the opaque display area 122b is less than the total visible light transmittance of the translucent display area 122a. Among them, the main image transmittance of the opaque display area 122b is less than 10%. In the direction from the opaque display area 122b to the translucent display area 122a, the main image transmittance of the opaque display area 122b remains unchanged. For example, in the direction from the opaque display area 122b to the translucent display area 122a, the main image transmittance of the opaque display area 122b can be 8%, 5%, 3%, 1%, 0.1%, 0.02% or 0. In some other embodiments, in the direction from the opaque display area 122b to the translucent display area 122a, the main image transmittance of the opaque display area 122b gradually increases.

[0095] In this setting, the opaque display area 122b can serve as the display background for the projection image 111a, which can better block external ambient light, avoid unnecessary interference to the line of sight, improve the contrast between the projection image 111a and the display background, and achieve a higher color gamut, making the projection image 111a display more clearly.

[0096] In this embodiment, the functional reflection layer 20 covers the part of the inner surface 10a located in the opaque display area 122b and the part of the inner surface 10a of the glass substrate 10 located in the semi-transparent display area 122a. The light blocking layer 14 covers the part of the second surface 102 located in the shielding area 123 and the part of the second surface 102 located in the opaque display area 122b.

[0097] Specifically, the light blocking layer 14 includes a connected first sub-part 141 and a second sub-part 142. Among them, the first sub-part 141 is located in the shielding area 123 and covers the part of the second surface 102 located in the shielding area 123. The second sub-part 142 is located in the opaque display area 122b and covers the part of the second surface 102 located in the opaque display area 122b. It can also be understood that the light blocking layer 14 can adjust the main image transmittance of the opaque display area 122b. By extending the light blocking layer 14 to the functional display area 122, the main image transmittance of this part of the functional display area 122 can be reduced, thereby forming the opaque display area 122b.

[0098] In some other embodiments, the main image transmittance of the opaque display area 122b can also be adjusted by an opaque polymer film or a dimming film. Among them, the opaque polymer film can be a polymer film with body coloring, a polymer film with surface printed ink, paint or pigment, or a polymer film with dyeing or coloring. The dimming film can be a polymer dispersed liquid crystal film (PDLC), a suspended particle film (SPD), an electrochromic film (EC), or a dye liquid crystal film (LC), etc. The lowest visible light transmittance of the dimming film is less than or equal to 10%. For example, the lowest visible light transmittance of the dimming film can be 8%, 5%, 4%, 3%, 2%, 1%, 0.5% or 0%. In addition, the highest visible light transmittance of the dimming film is set according to actual production needs. For example, the highest visible light transmittance of the dimming film can be 10%, 20%, 30%, 50% or 80%, etc. In addition, when information needs to be displayed in the opaque display area 122b, the dimming film is in an opaque state. At this time, the visible light transmittance of the dimming film is less than or equal to 5%, or even 0%. In this setting, the contrast between the projection image 111a and the display background can be improved, enabling the driver and passengers to observe the projection image 111a more clearly, which helps to enhance the use experience of the driver and passengers.

[0099] Please refer to Figure 10 , Figure 10 isFigure 1 Schematic cross-sectional structure diagram of the head-up display glass 120 of the head-up display system 100 in the vehicle 1000 shown in the third embodiment.

[0100] The difference between the head-up display glass 120 shown in this embodiment and the head-up display glass 120 shown in the second embodiment above is that the function display area 122 further includes at least one first extended display area 122d located in the shielding area 123, and the first extended display area 122d is connected to the opaque display area 122b. Among them, at least part of the first extended display area 122d is covered by the function reflection layer 20. In this embodiment, the total visible light transmittance of the first extended display area 122d is less than or equal to the total visible light transmittance of the opaque display area. Among them, the main image transmittance TL of the first extended display area 122d 1 and the main image transmittance TL of the part of the first extended display area 122d covered by the function reflection layer 20 1 and the secondary image transmittance TL 2 The ratio TT 12 and the ratio RR of the main image reflectance RL1 and the secondary image reflectance RL of the part of the first extended display area 122d covered by the function reflection layer 20 to the projection light 111 2 The ratio RR 12 can all refer to the relevant descriptions of the opaque display area 122b above, and will not be elaborated here.

[0101] Under this setting, the first extended display area 122d can also be used as the display background of the projection image 111a, further blocking the external ambient light, avoiding unnecessary interference to the line of sight, further improving the contrast between the projection image 111a and the display background, and achieving a higher color gamut, making the projection image 111a display more clearly.

[0102] In addition, in this embodiment, the function reflection layer 20 includes a first part 21, a second part 22 and a third part 23 connected in sequence. Among them, the first part 21 is located in the semi-transparent display area 122a of the function display area 122 and covers the part of the inner surface 10a located in the semi-transparent display area 122a. The second part 22 is located in the opaque display area 122b and covers the part of the inner surface 10a located in the opaque display area 122b. The third part 23 is located in the first extended display area 122d and covers the part of the inner surface 10a located in the first extended display area 122d.

[0103] Please refer to Figure 11 , Figure 11 is Figure 1 Schematic cross-sectional structure diagram of the head-up display glass 120 of the head-up display system 100 in the vehicle 1000 shown in the fourth embodiment.

[0104] The head-up display glass 120 shown in this embodiment is different from the head-up display glass 120 shown in the first embodiment above in that the function display area 122 further includes at least one second extended display area 122c located in the viewing area 121. The second extended display area 122c is connected to the semi-transparent display area 122a, and at least part of the second extended display area 122c is covered by the function reflection layer 20. Among them, the total visible light transmittance of the second extended display area 122c is greater than or equal to the total visible light transmittance of the semi-transparent display area. The main image transmittance TL of the second extended display area 122c 1 and the main image transmittance TL of the part of the second extended display area 122c covered by the function reflection layer 20 1 and the secondary image transmittance TL 2 The ratio TT 12 of, and the main image reflectance RL of the part of the second extended display area 122c covered by the function reflection layer 20 to the projection light 111 1 and the secondary image reflectance RL 2 The ratio RR 12 etc. can all refer to the relevant description of the semi-transparent display area 122a above and will not be elaborated here.

[0105] In this embodiment, when the second extended display area 122c extends to the viewing area B, the total visible light transmittance of the second extended display area 122c is greater than or equal to 70%. Among them, the total visible light transmittance of part of the second extended display area 122c is greater than or equal to 75%. Preferably, the total visible light transmittance of the second extended display area 122c is greater than or equal to 85%, or the total visible light transmittance of the second extended display area 122c is greater than or equal to 88%, or the total visible light transmittance of the second extended display area 122c is greater than or equal to 90%. In some other embodiments, when the second extended display area 122c only extends to the viewing area B deduction area, the total visible light transmittance of the second extended display area 122c can be less than 70%, or the vertical display range of the head-up display glass 120 can be increased to improve the display effect of the head-up display glass 120.

[0106] When the projection light 111 is incident on the part of the second extended display area 122c covered by the function reflection layer 20 at an incident angle of 65°, the S-polarized light reflectance R S ≥55%, and the P-polarized light reflectance R P ≤15%. When the projection light 111 is incident on the function reflection layer 20 at an incident angle of 0°, the S-polarized light reflectance R S ≤27%, and the S-polarized light reflectance R S and the P-polarized light reflectance R PThe ratio a is 0.9 ≤ a ≤ 1.1. That is, when the projection light 111 is incident on the functional reflection layer 20 at an incident angle of 0°, the S-polarized light reflectivity R S is approximately equal to the P-polarized light reflectivity R P .

[0107] Under this setting, the vertical display range of the head-up display glass 120 can be increased, and the display effect of the head-up display glass 120 can be improved. At the same time, since the main image transmittance of the semi-transparent display area 122a is greater than or equal to 70%, with high transparency, the head-up display glass 120 has good permeability and visibility outside the vehicle, thereby effectively solving the problem of insufficient transparency of the head-up display glass 120 and improving the driving experience of the driver and passengers.

[0108] In this embodiment, the functional reflection layer 20 includes a first part 21, a second part 22, and a third part 23 connected in sequence. Among them, the first part 21 is located in the semi-transparent display area 122a of the functional display area 122 and covers the part of the inner surface 10a located in the semi-transparent display area 122a. The second part 22 is located in the second extended display area 122c and covers the part of the inner surface 10a located in the second extended display area 122c. The third part 23 is located in the viewing area 121 and covers the part of the inner surface 10a located in the viewing area 121.

[0109] Please refer to Figure 12 , Figure 12 which Figure 4 is the simulated curve graph of the reflectivity and transmittance indexes of the head-up display glass 120 shown.

[0110] This application performs simulation calculations on the head-up display glass 120 shown in the first embodiment to understand the main image reflectivity RL 1 , sub-image reflectivity RL 2 , main image transmittance TL 1 and sub-image transmittance TL 2 and other relationships between the indexes. The specific simulation conditions are as follows:

[0111] This application provides Examples A-E. When the incident angle of the projection light 111 is 0°, the maximum value of the visible light transmittance TL 0 in Examples A-E under the condition of 0° incident angle is set to 92%. In Examples A-E, the middle layer 13 is used to adjust the main image transmittance TL 1The adjustment film layer. In Examples A - E, a uniform transparent thin film layer was used as the functional reflection layer 20, and the functional reflection layer 20 in Examples A - E was specular reflection. Among them, the S - polarization reflectance Rs and P - polarization reflectance Rp of the functional reflection layer 20 in Examples A - E are shown in Table 1. The natural light 2000 and the projection light 111 were both incident on Examples A - E at an incident angle of 70°, and multiple refractions and reflections occurred. The refractive angle, reflection ratio, transmittance, and light intensity of the natural light 2000 and the projection light 111 at the interface can be calculated using Snell's Law, Fresnel Formula, and Beer - Lambert Law. Calculate the main image reflectance RL 1 and the secondary image reflectance RL 2 of the ratio RR 12 , as well as the main image transmittance TL 1 and the secondary image transmittance TL 2 of the ratio TT 12 , and the experimental results are as shown in Figure 12 .

[0112] Table 1

[0113] Number S-polarized light reflectivity Rs P-polarized light reflectivity Rp Example A 80％ 1.4％ Example B 59.5％ 1.4％ Example C 40％ 1.4％ Example D 59.5％ 40％ Example E 35％ 20％

[0114] According to Figure 12 the experimental results shown, by reasonably setting the S - polarization reflectance Rs and P - polarization reflectance Rp of the functional reflection layer 20, it is possible to simultaneously make the main image transmittance TL 1 ≥10% of the head - up display glass 120, the ratio RR 1 of the main image reflectance RL 2 and the secondary image reflectance RL 12 ≥15, and the ratio TT 1 of the main image transmittance TL 2 and the secondary image transmittance TL 12 ≥15, so as to obtain a product that meets the requirements. Among them, the relationship between the main image reflectance RL 1 , secondary image reflectance RL 2 , main image transmittance TL 1 and secondary image transmittance TL 2 and other indicators is as follows:

[0115] As the total visible light transmittance of the head - up display glass 120 increases, the main image transmittance TL 1 of the head - up display glass 120 will also increase. When the P - polarization reflectance Rp remains unchanged and the natural light 2000 is incident at an incident angle of 70°, the main image transmittance TL of the head - up display glass 1201 has a maximum value. For example, the main image transmittance TL of Example A 1 has a maximum value of 54.3%, and the main image transmittance TL of Example B 1 has a maximum value of 61.4%, and the main image transmittance TL of Example C 1 has a maximum value of 68.2%.

[0116] When natural light 2000 is incident at an incident angle of 70°, as the main image transmittance TL of the head-up display glass 120 1 increases, the ratio RR of the main image reflectance RL 1 and the sub-image reflectance RL 2 of the head-up display glass 120, 12 and the ratio TT of the main image transmittance TL 1 and the sub-image transmittance TL 2 of the head-up display glass 120 12 both decrease.

[0117] When natural light 2000 is incident at an incident angle of 70° and the main image transmittance TL of the head-up display glass 120 1 and the P-polarized light reflectance Rp of the functional reflective layer 20 remain unchanged, the greater the S-polarized light reflectance Rs of the functional reflective layer 20, the greater the ratio RR of the main image reflectance RL 1 and the sub-image reflectance RL 2 of the head-up display glass 120 12 is.

[0118] The following will be described with specific examples, but the present invention is not limited to the following embodiments.

[0119] Please refer to Figure 13 and Figure 14 , Figure 13 which is a graph of the S-polarized light reflectance and P-polarized light reflectance of the functional reflective layer 20 when the projection light 111 is incident on the head-up display glass 120 shown in Figure 9 , and Figure 14 which is a graph of the relative emission spectra of the light sources of two display screens.

[0120] Examples 1-2

[0121] Embodiment 1-2 is a specific structural example of the head-up display glass 120 in the above second embodiment. Prepare the outer glass 11, inner glass 12, intermediate layer 13, light barrier layer 14 and functional reflection layer 20 in Embodiment 1-2. The light barrier layer 14 is disposed on the second surface 102 of the outer glass 11. Among them, the light barrier layer 14 covers the part of the second surface 102 located in the shielding area 123 and the part of the second surface 102 located in the opaque display area 122b. The inner glass 12 and the outer glass 11 with the light barrier layer 14 are connected together through the intermediate layer 13, thereby obtaining the glass substrate 10 in Embodiment 1-2.

[0122] On the fourth surface 104 of the inner glass 12, a functional reflection layer 20 is formed by screen printing and high-temperature sintering using mirror ink. Among them, the main mass components of the mirror ink are 98.4% of TiO 2 and 0.85% of SiO 2 . The mirror ink is printed on the fourth surface 104 according to a specific position and pattern. After high-temperature sintering at 550°C to 690°C, the mirror ink is firmly attached to the fourth surface 104. After sintering, the mirror ink has a high mirror reflection effect and a transparent visible effect, and also has good hardness and wear resistance characteristics, etc. The single-sided visible light reflectivity of the functional reflection layer 20 at different incident angles is shown in Table 2, and the curve graphs of the S-polarized light reflectivity Rs and P-polarized light reflectivity Rp of the functional reflection layer 20 are as Figure 12 shown. According to Figure 13 it can be known that when the projection light 111 is incident on the functional reflection layer 20 at an incident angle of 70°, the P-polarized light reflectivity Rp is relatively low, and the S-polarized light reflectivity curve and P-polarized light reflectivity curve in the wavelength band of 400nm to 700nm are approximately flat and linearly changing. Among them, ΔDs is 0.42% and ΔDp is 0.34%.

[0123] Table 2

[0124]

[0125] Embodiment 1: The outer glass 11 and the inner glass 12 are both made of transparent glass with a thickness of 2.1 mm, and the intermediate layer 13 is made of light gray PVB with a thickness of 0.76 mm. Among them, in the direction from the shielding area 123 to the viewing area 121, the color of the light gray PVB gradually becomes lighter. In Embodiment 1, the main image transmittance of the viewing area 121 for the natural light 2000 incident at an incident angle of 0° is 88.8%.

[0126] Example 2: The outer glass sheet 11 is a green heat-insulating glass with a thickness of 2.1 mm, the inner glass sheet 12 is a green glass with a thickness of 2.1 mm, and the intermediate layer 13 is PVB with a thickness of 0.76 mm. In Example 2, the main image transmittance of the natural light 2000 incident at an incident angle of 0° on the visual field area 121 is 74.6%.

[0127] Two types of display screens are respectively used as the projection device 110, which is arranged below the function display area 122 of the head-up display glass 120 in Examples 1-2 and projects image information. At this time, the light of the two display screens mainly enters the observer's eyes as S-polarized light. Observe and record information such as the clarity of the displayed image at the set observation position 3000, and record the simulation measurement results in Table 3. Among them, the incident angle of observing the center position of the opaque display area 122b from the observation position 3000 is 70.5°, the incident angle of observing the center position of the function display area 122 from the observation position 3000 is 70.0°, and the incident angle of observing the side of the visual field area 121 close to the function display area 122 from the observation position 3000 is 68°. The refractive angle, reflection ratio, transmittance, light intensity, etc. of the light at the interfaces of the visual field area 121, function display area 122, and opaque display area 122b of the head-up display glass 120 can be calculated using Snell's Law, Fresnel Formula, and Beer-Lambert Law.

[0128] In addition, for ease of description, the above two display screens are respectively named Display Screen One and Display Screen Two. Exemplarily, Display Screen One is a TFT-LCD display screen, and Display Screen Two is an OLED display screen. Among them, an S-polarizing film is provided on the second display screen. Both Display Screen One and Display Screen Two use S-polarized light for incidence, and their relative emission spectral curves of the light sources are as Figure 14 shown.

[0129] Table 3

[0130]

[0131]

[0132] According to the above experimental results, in Example 1, the ratio TT 1 of the main image transmittance TL 2 to the secondary image transmittance TL 12 is 105, and the ratio RR 1 of the main image reflectance RL 2 to the secondary image reflectance RL 12is 52.5. Meanwhile, from the observation position of 3000, the outside vehicle information in the function display area 122 is very clear at the center position of the function display area 122. The main image reflectivity RL of the opaque display area 122b 1 and the secondary image reflectivity RL 2 The ratio RR 12 is greater than 100. In addition, from the observation position of 3000, on the side of the viewing area 121 close to the function display area 122, the outside vehicle information in the viewing area 121 is very clear. In Example 2, the main image transmittance TL of the function display area 122 1 and the secondary image transmittance TL 2 The ratio TT 12 is 40, and the ratio RR of the main image reflectivity RL 1 and the secondary image reflectivity RL 2 of the function display area 122 12 is 20. Meanwhile, from the observation position of 3000, the outside vehicle information in the function display area 122 is very clear at the center position of the function display area 122. The main image reflectivity RL of the opaque display area 122b 1 and the secondary image reflectivity RL 2 The ratio RR 12 is greater than 100. In addition, from the observation position of 3000, on the side of the viewing area 121 close to the function display area 122, the outside vehicle information in the viewing area 121 is very clear. This indicates that the head-up display glass 120 in Examples 1-2 both has the ability to display image information in the function display area 122, and both have a certain visibility for the image display information. Among them, the outside vehicle information display effect of the head-up display glass 120 in Example 2 is better and brighter. At the same time, it also has the effect of visible outside vehicle information, and has clear visibility for the outside vehicle information, and almost no transmission ghosting can be felt. Among them, the reflection ghosting of the head-up display glass 120 in Example 1 is almost invisible. The reflection ghosting of the head-up display glass 120 in Example 2 is acceptable in the daytime conventional scene, and there is a little reflection ghosting in the nighttime low-brightness scene or with a low-brightness background (such as the reflection image on the black engine hood), which is related to factors such as the actual use scene, the observation distance, and the human eye vision.

[0133] In Example 1, the ratio Q of the main image transmittance TL of the function display area 122 1 to the main image transmittance TL of the adjacent viewing area 121 1 is 40.5%. In Example 2, the ratio Q of the main image transmittance TL of the function display area 122 1 to the main image transmittance TL of the adjacent viewing area 121 1 is 84.0%. Compared with Example 1, in Example 2, the main image transmittance TL of the function display area 122 1 and the main image transmittance TL of the adjacent viewing area 1211 The ratio Q is larger. This indicates that the transparency transition between the functional display area 122 and the visual field area 121 in Embodiment 2 is smoother, and the visual effect is better.

[0134] In addition, the S-polarized light reflectivity curve and the P-polarized light reflectivity curve of the functional reflection layer 20 in Embodiments 1-2 both change approximately linearly. The color after being reflected by the head-up display glass 120 is directly related to the display screen light source parameters. Under the parameter settings of the above-mentioned Display Screen 1 and Display Screen 2, the virtual image that cannot be seen by the human eye is color-shifted. This indicates that when the main image reflectivity curve of the functional reflection layer 20 changes approximately linearly, it is more convenient to adjust the display color of the image information displayed by the head-up display glass 120, so as to ensure good display effect of the head-up display glass 120.

[0135] The embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A head-up display glass for use in a vehicle, characterized in that: The head-up display glass comprises a glass substrate and a functional reflective layer, the glass substrate comprises an inner surface, the functional reflective layer is arranged on the inner surface, and the functional reflective layer is used to reflect projection light; The head-up display glass comprises a viewing area, a functional display area and a shielding area, the functional display area comprises at least one semi-transparent display area located between the viewing area and the shielding area, the total visible light transmittance of the semi-transparent display area is less than or equal to the total visible light transmittance of the viewing area and greater than the total visible light transmittance of the shielding area, the semi-transparent display area is at least partially covered by the functional reflective layer, the portion of the semi-transparent display area covered by the functional reflective layer has a primary image reflectivity RL1 and a secondary image reflectivity RL2 for the projection light, and the ratio RR of the primary image reflectivity RL1 to the secondary image reflectivity RL2 of the portion of the semi-transparent display area covered by the functional reflective layer 12 ≥15.

2. The head-up display glass according to claim 1, characterized in that: The minimum distance H between the boundary of the viewing area close to the shielding area and the boundary of the semi-transparent display area close to the shielding area is in the range of H≥10mm, or H≥30mm, or H≥50mm, or H≥100mm.

3. The head-up display glass according to claim 1, characterized in that: The main image transmittance TL1 of the portion of the semi-transparent display area covered by the functional reflective layer is ≥10%, or TL1 ≥20%, or TL1 ≥30%.

4. The head-up display glass according to claim 1, characterized in that: The ratio TT of the primary image transmittance TL1 and the secondary image transmittance TL2 of the part of the semi-transparent display area covered by the functional reflective layer 12 ≥15.

5. The head-up display glass according to any one of claims 1 to 4, characterized in that: In the direction from the semi-transparent display area to the viewing area, the main image transmittance TL1 of the part of the semi-transparent display area covered by the functional reflective layer remains unchanged, or the main image transmittance TL1 of the part of the semi-transparent display area covered by the functional reflective layer gradually increases.

6. The head-up display glass according to claim 1, characterized in that: The functional display area also includes an opaque display area, which is located on a side of the semi-transparent display area close to the shielding area, and the total visible light transmittance of the opaque display area is less than the total visible light transmittance of the semi-transparent display area.

7. The head-up display glass according to claim 6, characterized in that: The main image transmittance of the opaque display area is less than 10%.

8. The head-up display glass according to claim 6 or 7, characterized in that: The opaque display area is at least partially covered by the functional reflective layer.

9. The head-up display glass according to claim 6, characterized in that: The functional display area also includes at least one first extended display area located in the shielding area, the first extended display area is connected to the opaque display area, the first extended display area is at least partially covered by the functional reflective layer, and the total visible light transmittance of the first extended display area is less than or equal to the total visible light transmittance of the opaque display area.

10. The head-up display glass according to claim 1, characterized in that: The ratio F of the area of ​​the semi-transparent display region to the area of ​​the functional display region is 10%≤F≤100%.

11. The head-up display glass according to claim 1, characterized in that: The ratio Q of the total visible light transmittance of the portion of the semi-transparent display area covered by the functional reflective layer to the total visible light transmittance of the adjacent viewing area is 0.3≤Q≤1, or 0.5≤Q≤1, or 0.8≤Q≤1, or 0.9≤Q≤1.

12. The head-up display glass according to claim 1, characterized in that: The functional reflection layer has an S-polarized light reflectivity R S The functional reflective layer has a P polarized light reflectivity R p , the P polarized light reflectivity R P Less than the S polarized light reflectivity R S .

13. The head-up display glass according to claim 12, characterized in that: The S polarized light reflectivity R S With the P polarized light reflectivity R P The ratio K≥1.

5.

14. The head-up display glass according to claim 12 or 13, characterized in that: When the projection light is incident on the functional reflective layer at an incident angle of 70°, the S-polarized light reflectivity R S ≥40%, the P polarized light reflectivity R P <40%.

15. The head-up display glass according to claim 14, characterized in that: When the projection light is incident on the functional reflective layer at an incident angle of 70°, the reflectivity deviation ΔDs of the functional reflective layer to the S-polarized light with a wavelength of 400nm to 700nm is ΔDs≤3%, or ΔDs≤2%, or ΔDs≤1%.

16. The head-up display glass according to claim 14, characterized in that: When the projection light is incident on the functional reflective layer at an incident angle of 70°, the reflectivity deviation ΔDp of the functional reflective layer to the P polarized light with a wavelength of 400nm to 700nm is ΔDp≤3%, or ΔDp≤2%, or ΔDp≤1%.

17. The head-up display glass according to claim 1 or 12, characterized in that: The functional display area also includes at least one second extended display area located in the field of view, the second extended display area is connected to the translucent display area, the second extended display area is at least partially covered by the functional reflective layer, and the total visible light transmittance of the second extended display area is greater than or equal to the total visible light transmittance of the translucent display area.

18. The head-up display glass according to claim 17, characterized in that: The functional reflection layer has an S-polarized light reflectivity R S The functional reflective layer has a P polarized light reflectivity R p , the P polarized light reflectivity R P Less than the S polarized light reflectivity R S When the projection light is incident on the portion of the second extended display area covered by the functional reflective layer at an incident angle of 65°, the S-polarized light reflectivity R S ≥55%, the P polarized light reflectivity R P ≤15%.

19. The head-up display glass according to claim 1, characterized in that: The refractive index of the functional reflective layer is n≥1.

7.

20. The head-up display glass according to claim 1, characterized in that: The functional reflective layer is a sol-gel coating.

21. The head-up display glass according to claim 1, characterized in that: The material of the functional reflective layer includes at least one of silicon nitride, silicon-metal mixed nitride, aluminum nitride, gallium nitride, titanium nitride, tin oxide, manganese oxide, tungsten oxide, niobium oxide, bismuth oxide, titanium oxide, tin-zinc mixed oxide, zirconium oxide, scandium oxide, yttrium oxide, tantalum oxide, lanthanum oxide, cerium oxide, tellurium oxide, aluminum oxide, silicon oxide, zinc oxide, indium oxide or transition metal oxide.

22. The head-up display glass according to claim 1, characterized in that: The glass substrate comprises an outer glass, an inner glass and an intermediate layer. Along the thickness direction of the glass substrate, the outer glass and the inner glass are spaced and arranged opposite to each other, and the intermediate layer is located between the outer glass and the inner glass. The head-up display glass further includes a functional layer, and the functional layer is disposed between the outer glass and the middle layer, or the functional layer is disposed between the middle layer and the inner glass.

23. The head-up display glass according to claim 1, characterized in that: The primary image reflectivity RL1 is the reflectivity of the functional reflective layer for the first reflection of S polarized light, and the secondary image reflectivity RL2 is the reflectivity of the S polarized light that passes through the functional reflective layer and enters the head-up display glass for the second reflection.

24. A head-up display system, characterized in that: The method comprises a projection device and a head-up display glass as claimed in any one of claims 1 to 23, wherein the projection device is located on a side of the head-up display glass facing the interior of the vehicle, and the projection device is used to emit the projection light.

25. The head-up display system according to claim 24, characterized in that: The projection light includes S-polarized light and P-polarized light, wherein the S-polarized light accounts for greater than or equal to 70% and less than or equal to 100% of the projection light.

26. The head-up display system according to claim 24 or 25, characterized in that: The projection light forms a projection image in the translucent display area, and along the direction of the line between the center of the projection image and the observation position, the distance between the projection image and the surface of the head-up display glass facing the outside of the vehicle is less than or equal to 1m.

27. A vehicle, characterized in that: It comprises a vehicle body and a head-up display system as claimed in any one of claims 24 to 26, wherein the head-up display glass is installed at an opening of the vehicle body, and the projection device is installed inside the vehicle body.

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