Projection display glass and vehicle

Abstract

The application relates to a projection display glass and a vehicle. A second glass plate is provided with an anti-reflection film on the side facing the internal environment, the mirror reflectivity of the side of the second glass plate facing the internal environment is RL', 1%≤RL'≤8%, RL' is small, thereby reducing the overlapping interference of the reflection on the projection display picture. In addition, RL0>10%, which can ensure the mirror projection display effect. In addition, under the mutual superposition of high haze and low transmittance, the improvement effect of the strong light halo is more remarkable, the interference on the projection display picture is greatly reduced, and the projection display picture is clear. In addition, the total assembly transmittance TL min ≥0.25%, which is not too small, avoiding that the total assembly transmittance TL min is too small to increase the mirror reflectivity and reduce the product performance, and the total assembly transmittance TL min is large enough, so that the field of view of the external environment of the projection display glass is clear. In addition, the total assembly transmittance TL max ≥1.41% when the light state is bright, the total assembly transmittance TL max is large enough, and the field of view of the external environment is clear.

Description

Technical Field

[0001] The present application relates to the field of glass technology, and in particular to a projection display glass and a vehicle. Background Art

[0002] With the rapid development of glass technology, projection display glass is widely used in various fields, including but not limited to smart windows and rearview mirrors, displays, etc. for spacecraft, high-speed railways, cars, buildings, etc. Projection display glass works in conjunction with the projection device to display information including but not limited to vehicle driving information, various patterns or play videos, etc., and can be used in various scenes such as welcoming guests, creating atmosphere, watching movies and working. However, especially in outdoor scenes during the day, when the projection display glass is exposed to strong light in the external environment, such as direct sunlight, defects such as halos and reflections inside the car will appear in the projected display image. Among them, halos have a huge adverse effect on the projected display image, especially strong direct white light causes the image to be lost. In the related art, there is a way to improve the projection effect by reducing the transmittance, but too low a transmittance will make the view of the scenery in the external environment more blurred and increase the degree of mirror reflection on the inner surface of the projection display glass. Summary of the Invention

[0003] Based on this, it is necessary to overcome the defects of the existing technology and provide a projection display glass and a vehicle, which can reduce the adverse effects of the halo of strong sunlight on the projection display image, so that the application scenarios can be expanded from night and indoors to daytime outdoor scenes; at the same time, the external environment can be clearly viewed, and the overlapping interference of the projection display caused by mirror reflection can be reduced.

[0004] A projection display glass, comprising:

[0005] A first glass plate, a dimming layer, a display carrier layer, and a second glass plate are stacked in sequence; the first glass plate faces the external environment, and the second glass plate faces the internal environment; an anti-reflection film is provided on the side of the second glass plate facing the internal environment; the specular reflectivity of the side of the second glass plate facing the internal environment is RL', 1%≤RL'≤8%;

[0006] When the dimming layer is in a dark state, the total haze of the projection display glass is ≥98%, and the total transmittance of the projection display glass is TL min , 0.25%≤TL min ≤2.33%;

[0007] When the dimming layer is in the bright state, the total transmittance of the projection display glass is TL max , TL max ≥1.41%;

[0008] The projection display glass has an overall reflectivity of RL0 on the side facing the internal environment, and RL0>10%.

[0009] In one embodiment, the dimming layer is PDLC, and when the PDLC is in a dark state, the haze of the PDLC is ≥95%; when the PDLC is in a bright state, the haze of the PDLC is ≤5%.

[0010] In one embodiment, the PDLC includes black PDLC and / or gray PDLC.

[0011] In one embodiment, the transmittance of the PDLC in a dark state is set to 1% to 30%; the transmittance of the PDLC in a bright state is set to 10% to 52%.

[0012] In one embodiment, the projection display glass further includes a first adhesive layer disposed between the first glass plate and the dimming layer, a second adhesive layer disposed between the dimming layer and the display bearing layer, and a third adhesive layer disposed between the display bearing layer and the second glass plate.

[0013] In one embodiment, the transmittance of the first adhesive layer and / or the second adhesive layer is set to 2% to 20%; and / or the third adhesive layer is set to a transparent adhesive material.

[0014] In one embodiment, the second glass plate is clear glass or ultra-clear glass; and / or RL0≤17%.

[0015] In one embodiment, the mirror reflectivity of the anti-reflection film is ≤4%.

[0016] In one embodiment, the display bearing layer is a photonic film.

[0017] A vehicle comprising the projection display glass.

[0018] In the above-mentioned projection display glass and vehicle, the projection device located in the internal environment projects the image onto the display bearing layer. Since an anti-reflection film is provided on the side of the second glass plate facing the internal environment, the mirror reflectivity of the side of the second glass plate facing the internal environment is RL', 1%≤RL'≤8%, and RL' is small, thereby reducing the degree of mirror reflection and thus reducing the overlapping interference caused by the reflection on the projection display image. In addition, RL0>10%, RL0 is large, which can ensure the mirror projection display effect. In addition, especially under strong light from the external environment, the dimming layer can be controlled to switch to a dark state accordingly, which can make the overall haze of the projection display glass ≥98%. The high haze has a diffuse reflection effect on the incident light from the internal environment, which is beneficial to improving the clarity of the projection display image, and the overall transmittance TL min It is relatively low, specifically 0.25% to 2.33%, and has good shielding properties. The combined effect of high haze and low transmittance makes the improvement of strong light halo more significant. Specifically, the large-scale halo on the projection display glass is reduced and weakened into a smooth and smooth outline, which greatly reduces the interference with the projection display image. The projection display image is clearly visible, which can reduce the adverse effects of the halo of strong sunlight on the projection display image, and expand the application scenarios from night and indoor to daytime outdoor scenes. In addition, when the projection display glass is in the dark state, due to the total transmittance TL min ≥0.25%, not too small to avoid the total transmittance TL min Too small will increase the mirror reflectivity and reduce the product performance. At the same time, when the projection device is not working, the assembly transmittance TL min It is large enough to make the field of view of the external environment of the projection display glass clearly visible. In addition, when there is no strong light in the external environment, the dimming layer can be controlled to switch to the bright state accordingly, which can make the total transmittance TL max ≥1.41%, assembly transmittance TL max It is large enough so that the external environment of the projection display glass is clearly visible when it is in the bright state. Secondly, when the projection display glass is in the dark state, due to its lower transmittance, the shading performance is improved, so the sunshade can be eliminated. For skylight glass, it can increase headroom by at least 100mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic structural diagram of a projection display glass according to an embodiment of the present application.

[0020] Figure 2 FIG. 1 is a schematic structural diagram of a projection display glass according to another embodiment of the present application.

[0021] Figure 3 This is a schematic structural diagram of a projection display glass according to another embodiment of the present application.

[0022] 10. First glass plate; 11. First surface; 12. Second surface; 20. Dimming layer; 30. Display bearing layer; 40. Second glass plate; 41. Third surface; 42. Fourth surface; 50. First adhesive layer; 51. First edge-filling adhesive layer; 60. Second adhesive layer; 61. Second edge-filling adhesive layer; 70. Third adhesive layer; 80. First light-blocking layer; 90. Second light-blocking layer. DETAILED DESCRIPTION

[0023] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0024] It should be noted that the transmittance in this embodiment refers to visible light transmittance. Transmittance testing standards generally include ISO 13837-2021 and ISO 9050-2003. In this embodiment, the transmittance of the components mentioned, including but not limited to the projection display glass, dimming layer, first adhesive layer, and second adhesive layer, is specifically measured using the ISO 9050-2003 test standard.

[0025] See Figure 1 or Figure 2 , Figure 1 and Figure 2 Schematic diagrams of the structures of projection display glasses in two different embodiments of the present application are shown respectively. Figure 2 Compared to Figure 1 The difference lies in the presence of a light-blocking layer. One embodiment of the present application provides a projection display glass comprising: a first glass plate 10, a dimming layer 20, a display carrier layer 30, and a second glass plate 40, stacked in sequence. The first glass plate 10 faces the external environment, while the second glass plate 40 faces the internal environment. An anti-reflection coating is provided on the side of the second glass plate 40 facing the internal environment (hereinafter referred to as the fourth surface 42). The anti-reflection coating reduces reflectivity. Specifically, the specular reflectivity RL' of the side of the second glass plate 40 facing the internal environment is 1% ≤ RL' ≤ 8%. This reduces specular reflection and minimizes overlapping interference caused by reflections on the projected display image. The specular reflectivity RL' is measured using a PE1050+ spectrophotometer on the side of the second glass plate 40 facing the internal environment (i.e., the side with the anti-reflection coating), and is specifically measured according to JIS R 3106.

[0026] The overall specular reflectivity of the side of the projection display glass facing the interior environment is RL1, and RL1 is ≤ 4%. The overall specular reflectivity refers to the value measured using a PE1050+ spectrophotometer on the side of the second glass plate 40 facing the interior environment after all layers of the projection display glass are stacked, and is specifically measured according to JIS R 3106.

[0027] Specifically, the side of the projection display glass facing the interior environment has an overall reflectivity of RL0 greater than 10%, resulting in a projected display image formed by diffuse reflection from the display carrier layer 30. The overall reflectivity refers to the RL0 value measured using a 950 spectrophotometer on the side of the second glass plate 40 facing the interior environment after all layers of the projection display glass are stacked. Alternatively, RL0 ≤ 17% can reduce specular reflection and minimize overlapping interference caused by reflections on the projected display image.

[0028] It should be noted that when light from the internal environment strikes the projection display glass, the side of the projection display glass facing the internal environment will experience both specular and diffuse reflection. Specular reflection primarily originates from the second glass plate 40, while diffuse reflection primarily originates from the display carrier layer 30. The magnitude of the overall reflectivity RL0 on the side of the projection display glass facing the internal environment is influenced not only by the magnitude of the overall specular reflectivity RL1 but also by the magnitude of the overall diffuse reflectivity RL2. In other words, changing the magnitude of the overall specular reflectivity RL1 and / or the magnitude of the overall diffuse reflectivity RL2 will correspondingly change the magnitude of the overall reflectivity RL0.

[0029] The anti-reflection film can reduce reflectivity, ensuring that the overall specular reflectivity RL1 is ≤ 4%. This reduces the degree of specular reflection in the dark state and reduces interference with the projected display. Specifically, the anti-reflection film is preferably disposed on the side of the second glass plate 40 facing the interior environment.

[0030] In addition, the mirror reflectivity of the anti-reflection film includes, but is not limited to, ≤8%, and specifically includes, for example, 8%, 6%, 2%, 1%, etc., which can be flexibly adjusted and set according to actual needs. In addition, the assembly mirror reflectivity RL1 is ≥ 0.76%, that is, the assembly mirror reflectivity RL1 is between 0.76% and 4%, including, but not limited to, 0.76%, 1%, 1.5%, 2%, 3%, or 4%, etc., which can be flexibly adjusted and set according to actual needs and is not limited here.

[0031] In addition, when the dimming layer 20 is in the dark state, the total haze of the projection display glass is ≥98%, and the total transmittance of the projection display glass is TL min , 0.25%≤TL min≤2.33%. When the dimming layer 20 is in the bright state, the total transmittance of the projection display glass is TL max , TL max ≥1.41%.

[0032] It should be noted that the overall haze of the projection display glass refers to the haze obtained by superimposing the haze of the dimming layer 20 and the haze of the other layers of the projection display glass. Specifically, after all layers of the projection display glass are superimposed, the side of the second glass plate 40 facing the internal environment is measured, for example, using a BYK haze meter. By flexibly adjusting and selecting the haze of the dimming layer 20 and / or the haze of the other layers of the projection display glass, the overall haze of the projection display glass can be flexibly adjusted and controlled to meet requirements, such as a haze of ≥98% in the dark state.

[0033] Furthermore, the overall transmittance of the projection display glass refers to the transmittance obtained by superimposing the transmittance of the dimming layer 20 and the transmittances of the other layers of the projection display glass. Specifically, after all layers of the projection display glass are superimposed, the side of the second glass plate 40 facing the internal environment is measured, for example, in accordance with the ISO 9050-2003 test standard, using a spectrometer to obtain the data. By flexibly adjusting and selecting the transmittance of the dimming layer 20 and / or the transmittances of the other layers of the projection display glass, the overall transmittance of the projection display glass can be flexibly adjusted and controlled accordingly, such that the overall transmittance of the projection display glass meets requirements, for example, satisfying 0.25% ≤ TL in the dark state. min ≤2.33%, TL in bright state max ≥1.41%.

[0034] It should be noted that the dimming layer 20 can be either a regular dimming layer or a reverse dimming layer, and this is not limited here. For the regular dimming layer, when the dimming layer is powered on, the dimming layer is in a high-transmittance state, i.e., a bright state; when the dimming layer is powered off, the dimming layer is in an off-state, i.e., a dark state. Conversely, for the reverse dimming layer, when the dimming layer is powered on, the dimming layer is in an off-state; when the dimming layer is powered off, the dimming layer is in a high-transmittance state.

[0035] In the above-mentioned projection display glass, the projection device located in the internal environment projects the image onto the display bearing layer. Since an anti-reflection film is provided on the side of the second glass plate facing the internal environment, the mirror reflectivity of the side of the second glass plate facing the internal environment is RL', 1%≤RL'≤8%, and RL' is small, thereby reducing the degree of mirror reflection and thus reducing the overlapping interference caused by the reflection on the projection display image. In addition, RL0>10%, RL0 is large, which can ensure the mirror projection display effect. In addition, especially under strong light from the external environment, the dimming layer 20 can be controlled to switch to a dark state accordingly, which can make the overall haze of the projection display glass ≥98%. The high haze has a diffuse reflection effect on the incident light from the internal environment, which is beneficial to improving the clarity of the projection display image, and the overall transmittance TL min It is relatively low, specifically 0.25% to 2.33%, and has good shielding properties. The combined effect of high haze and low transmittance makes the improvement of strong light halo more significant. Specifically, the large-scale halo on the projection display glass is reduced and weakened into a smooth and rounded outline, greatly reducing the interference with the projection display image. The projection display image is clearly visible, which can reduce the adverse effects of the halo of strong sunlight on the projection display image, and expand the application scenarios from nighttime and indoor to daytime outdoor scenes. In addition, when the projection display glass is in the dark state, due to the total transmittance TL min ≥0.25%, not too small to avoid the total transmittance TL min Too small will increase the mirror reflectivity and reduce the product performance. At the same time, when the projection device is not working, the assembly transmittance TL min It is large enough to make the field of view of the external environment of the projection display glass clearly visible. In addition, when there is no strong light in the external environment, the dimming layer 20 can be controlled to switch to the bright state accordingly, which can make the total transmittance TL max ≥1.41%, assembly transmittance TL max It is large enough so that the external environment of the projection display glass is clearly visible when it is in the bright state. Secondly, when the projection display glass is in the dark state, due to its lower transmittance, the shading performance is improved, so the sunshade can be eliminated. For skylight glass, it can increase headroom by at least 100mm.

[0036] In some embodiments, the dimming layer 20 includes but is not limited to one or a combination of two or more of LC (dye liquid crystal film) film, PDLC (polymer dispersed liquid crystal) film, GHLC (guest-host liquid crystal), PNLC (Polymer Network Liquid Crystal) functional element, PSLC (polymer stabilized liquid crystal) film, PILC (pixel isolation liquid crystal) film, etc.

[0037] In an embodiment, the dimming layer 20 is specifically, for example, a PDLC. In the PDLC, when the PDLC is in a dark state, the haze of the PDLC is ≥ 95%; and when the PDLC is in a bright state, the haze of the PDLC is ≤ 5%. In this way, compared with other types of dimming layers 20, based on the characteristics of the PDLC itself, the haze of the PDLC in the dark state is relatively larger, and can be more than 95%, specifically, for example, 95%, 96%, 97%, 98%, 99%, 99.5%, etc., so that the overall haze of the projection display glass in the dark state can be more than 98%, and the high haze can play a role in diffuse reflection of the incident light from the internal environment, thereby improving the clarity of the projection display image; at the same time, the transmittance in the dark state is low, and the overall transmittance can be ≤ 2%, even 1.5%, 1%, 0.5%, 0.2% or 0.1%, and then under the mutual superposition of high haze and low transmittance, the improvement effect of the strong light halo is more significant, and under strong light, the large-scale halo appearing on the projection display glass can be reduced and weakened to a smooth and smooth outline, greatly reducing the interference to the projection display image.

[0038] In some embodiments, the PDLC can be set as a white PDLC, a gray PDLC, a black PDLC, etc., and can be flexibly adjusted and set according to actual needs. Regardless of the white PDLC, the gray PDLC and the black PDLC, when the PDLC is in a dark state, the haze of the PDLC is ≥ 95%; and when the PDLC is in a bright state, the haze of the PDLC is ≤ 5%. In addition, the transmittance of the white PDLC, the gray PDLC and the black PDLC is different from each other, and can be flexibly adjusted and set according to actual needs. Among them, compared with the white PDLC, the gray PDLC and the black PDLC are specifically obtained by plating color on the PET layer and / or adding dye in the liquid crystal between the adjacent two PET layers, and by flexibly adjusting and setting the plating color and / or the dye, the transmittance can be adjusted and controlled, so as to meet the requirements of the transmittance.

[0039] In some embodiments, the PDLC, for example, adopts a white PDLC, and the transmittance range is set to, for example, 60%-80%.

[0040] In some embodiments, the PDLC, for example, adopts a PET-colored black PDLC, and the transmittance range is set to, for example, 3%-5%.

[0041] In some embodiments, the PDLC, for example, adopts a PET-colored gray PDLC, and the transmittance range is set to, for example, 30%-40%.

[0042] In some embodiments, the PDLC, for example, black PDLC using dye liquid crystals, has a transmittance range including but not limited to 6%-36%, 5%-45%, 7%-52%, 4%-40%, 1%-10% or 1%-15%, which can be flexibly adjusted and set according to actual needs.

[0043] In one embodiment, the PDLC includes black PDLC and / or gray PDLC; the transmittance of the PDLC in a dark state is set to 1% to 30%, including but not limited to 1%, 2%, 3%, 4%, 5%, 6%, 7%, 10%, 15%, 30%, etc.; the transmittance of the PDLC in a bright state is set to 10% to 52%, including but not limited to 10%, 15%, 20%, 25%, 30%, 36%, 45%, 52%, etc. In this way, when the PDLC includes black PDLC and / or gray PDLC, the transmittance is relatively smaller than that of white PDLC. In addition, by adjusting and controlling the transmittance of the PDLC, it can achieve an overall transmittance of TL when combined with other layers of the projection display glass. min The total transmittance is TL max Meets the requirements.

[0044] See also Figure 1 or Figure 2 In one embodiment, the projection display glass further includes a first adhesive layer 50 disposed between the first glass plate 10 and the dimming layer 20, a second adhesive layer 60 disposed between the dimming layer 20 and the display carrier layer 30, and a third adhesive layer 70 disposed between the display carrier layer 30 and the second glass plate 40. Thus, the first glass plate 10 is bonded and fixed to the dimming layer 20 via the first adhesive layer 50, the dimming layer 20 is bonded and fixed to the display carrier layer 30 via the second adhesive layer 60, and the display carrier layer 30 is bonded and fixed to the second glass plate 40 via the third adhesive layer 70.

[0045] See also Figure 3 In some embodiments, the projection display glass further includes a first edge-filling adhesive layer 51 circumferentially arranged around the dimming layer 20. The first edge-filling adhesive layer is connected between the first adhesive layer 50 and the second adhesive layer 60. For example, the first edge-filling adhesive layer forms an integrated structure with the first adhesive layer 50 and the second adhesive layer 60, thereby enabling the first adhesive layer 50, the second adhesive layer 60 and the dimming layer 20 to be stably connected together.

[0046] See also Figure 3In some embodiments, the projection display glass further includes a second edge-filling adhesive layer 61 disposed circumferentially around the display carrier layer 30. The second edge-filling adhesive layer is connected between the second adhesive layer 60 and the third adhesive layer 70. For example, the second adhesive layer 60 and the third adhesive layer 70 form an integrated structure, thereby stably connecting the second adhesive layer 60, the third adhesive layer 70, and the display carrier layer 30. Of course, the second edge-filling adhesive layer can also be omitted.

[0047] In one embodiment, the transmittance of the first adhesive layer 50 and / or the second adhesive layer 60 is set to 2% to 20%. Specifically, the transmittance of the first adhesive layer 50 or the second adhesive layer 60 includes, but is not limited to, various values ​​such as 2%, 3%, 4%, 5%, 6%, 7%, 8%, 10%, 15%, 18%, 20%, etc. Of course, the transmittance after the first adhesive layer 50 and the second adhesive layer 60 are superimposed can also be set to include, but is not limited to, various values ​​such as 2%, 3%, 4%, 5%, 6%, 7%, 8%, 10%, 15%, 18%, 20%, etc. In this way, on the one hand, the transmittance of the first adhesive layer 50 and / or the second adhesive layer 60 is relatively small, and by flexibly adjusting and controlling the transmittance of the first adhesive layer 50 and / or the second adhesive layer 60, after being combined with the other layers of the projection display glass, the overall transmittance of the projection display glass can be controlled to meet the requirements, for example, satisfying 0.25%≤TL in the dark state. min ≤2.33%, TL in bright state max ≥1.41%; on the other hand, the first adhesive layer 50 and / or the second adhesive layer 60 play a certain shielding role, and the projection image on the display bearing layer 30 cannot be observed from the external environment, thereby improving privacy.

[0048] In one embodiment, the material selection and thickness of the first adhesive layer 50 and the second adhesive layer 60 are independently set and adjusted according to actual needs, as long as their respective transmittances meet preset requirements and the bonding stability between the dimming layer 20, the display carrier layer 30, and the first glass plate 10 is improved. The materials of the first adhesive layer 50 and the second adhesive layer 60 can be the same or different, including but not limited to PVB, EVA, TPU, or SGP. Furthermore, the thickness of the first adhesive layer 50 and the second adhesive layer 60 can be the same or different, including but not limited to 0.38 mm, 0.76 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm, and can be flexibly adjusted and set according to actual needs.

[0049] In some embodiments, the transmittance of the first adhesive layer 50 and the second adhesive layer 60 may be the same or different. In this embodiment, the transmittance of the first adhesive layer 50 is set to 2% to 20%, and the second adhesive layer 60 is set to a transparent adhesive material.

[0050] In one embodiment, the third adhesive layer 70 is made of a transparent adhesive material, so that the projection image of the display carrier layer 30 can be clearly observed.

[0051] The “transparent” in the transparent adhesive material means that the transmittance in the visible spectrum is greater than or equal to 30%, preferably greater than or equal to 50%, more preferably greater than or equal to 75%, and particularly greater than or equal to 85%.

[0052] In one embodiment, the second glass plate 40 is clear glass or ultra-clear glass. This allows for a clear view of the projection image of the display carrier layer 30. The transmittance of clear glass is 89% to 92.2%, specifically including but not limited to 89%, 89.5%, 90%, 90.5%, 90.6%, 91%, 91.5%, 92%, 92.2%, and the like. The thickness of clear glass is, for example, 1.8 mm to 2.3 mm, specifically including but not limited to 1.8 mm, 2 mm, 2.2 mm, or 2.3 mm. Furthermore, the transmittance of ultra-clear glass is higher than that of clear glass, and is 91% to 92%, specifically including but not limited to 91%, 91.5%, 91.6%, 92%, and the like. The thickness of ultra-clear glass is, for example, 2 mm to 2.2 mm, specifically including but not limited to 2 mm, 2.1 mm, or 2.2 mm.

[0053] In some embodiments, the first glass plate 10 includes but is not limited to gray glass, green glass, etc. In addition, the outer glass plate is provided with, for example, a double silver film layer to prevent glare.

[0054] The display carrier layer 30 can be a flexible, transparent, diffusely reflective structure that reflects light from the projector to form an image. It can be a photon-transparent screen, specifically, dispersed reflective particles on a transparent film, or a wave-aligned liquid crystal on a transparent substrate, or a flexible, transparent display film with similar functionality.

[0055] In one embodiment, the display bearing layer 30 is a photonic film. After testing, it was found that when the photonic film and PDLC are combined with each other, the projection effect of the projected image can be significantly improved. Among them, the photonic film adopts a special transparent projection film. This film is an artificial microstructure formed by the periodic arrangement of media with different refractive indices. It has a high reflective effect in the visible light band to improve the display performance. Specifically, the transmittance of the photonic film is greater than 90%, for example, 91%, 92%, 93%, 95%, 96%, 97%, 98%, 99%, 99.5%, etc.

[0056] See also Figure 2 In one embodiment, the projection display glass further includes a first light-blocking layer 80 and a second light-blocking layer 90. The first glass plate 10 includes a first surface 11 facing the external environment and a second surface 12 opposite to the first surface 11. The second glass plate 40 includes a third surface 41 and a fourth surface 42 opposite to the third surface 41. The third surface 41 is disposed opposite the second surface 12. The first light-blocking layer 80 is disposed around the second surface 12. The transmittance of the first light-blocking layer 80 is ≤10%, including but not limited to 10%, 9%, 8%, 7%, 6%, 5%, 3%, 2%, 1%, 0%, etc., thus providing a light-blocking effect, which is equivalent to a black border. The second light-blocking layer 90 is disposed on the fourth surface 42. The transmittance of the second light-blocking layer 90 is ≤10%, including but not limited to 10%, 9%, 8%, 7%, 6%, 5%, 3%, 2%, 1%, 0%, etc., thus providing a light-blocking effect, which is equivalent to a black border.

[0057] In one embodiment, a vehicle includes, but is not limited to, a car, bus, sedan, public bus, coach, truck, jeep, train, high-speed train, etc. The vehicle includes the projection display glass of any of the above-described embodiments. The projection display glass includes, but is not limited to, a sunroof, front windshield, side windshield, rear windshield, rearview mirror, etc. of the vehicle.

[0058] In the above-mentioned means of transportation, the projection device located in the interior environment projects the image onto the display bearing layer. Since an anti-reflection film is provided on the side of the second glass plate facing the interior environment, the mirror reflectivity of the side of the second glass plate facing the interior environment is RL', 1% ≤ RL' ≤ 8%, and RL' is small, thereby reducing the degree of mirror reflection and thus reducing the overlapping interference caused by the reflection on the projected display image. In addition, RL0>10%, RL0 is large, which can ensure the mirror projection display effect. In addition, especially under strong light from the external environment, the dimming layer 20 can be controlled to switch to a dark state accordingly, which can make the overall haze of the projection display glass ≥98%. The high haze has a diffuse reflection effect on the incident light from the internal environment, which is beneficial to improving the clarity of the projected display image, and the overall transmittance TL min It is relatively low, specifically 0.25% to 2.33%, and has good shielding properties. The combined effect of high haze and low transmittance makes the improvement of strong light halo more significant. Specifically, the large-scale halo on the projection display glass is reduced and weakened into a smooth and smooth outline, which greatly reduces the interference with the projection display image. The projection display image is clearly visible, which can reduce the adverse effects of the halo of strong sunlight on the projection display image, and expand the application scenarios from night and indoor to daytime outdoor scenes. In addition, when the projection display glass is in the dark state, due to the total transmittance TLmin ≥0.25%, not too small to avoid the total transmittance TL min Too small will increase the mirror reflectivity and reduce the product performance. At the same time, when the projection device is not working, the assembly transmittance TL min It is large enough to make the field of view of the external environment of the projection display glass clearly visible. In addition, when there is no strong light in the external environment, the dimming layer 20 can be controlled to switch to the bright state accordingly, which can make the total transmittance TL max ≥1.41%, assembly transmittance TL max It is large enough so that the external environment of the projection display glass is clearly visible when it is in the bright state. Secondly, when the projection display glass is in the dark state, due to its lower transmittance, the shading performance is improved, so the sunshade can be eliminated. For skylight glass, it can increase headroom by at least 100mm.

[0059] In order to more clearly demonstrate the product performance of the projection display glass, performance tests were conducted on the projection display glass of this embodiment and the comparative example using different components, and the following Table 1 and Table 2 were obtained:

[0060] Table 1

[0061]

[0062] Table 2

[0063]

[0064] It should be noted that T1 to T7 correspond to Figure 1 or Figure 2 , the first glass plate 10, first adhesive layer 50, dimming layer 20, second adhesive layer 60, photonic film, third adhesive layer 70, and second glass plate 40 are shown. In T1, the 2.1 in 2.1C indicates that the thickness of the selected first glass plate 10 is 2.1 mm, C indicates that the selected first glass plate 10 is a transparent plate, and 2AG indicates that a double silver film layer is provided on the surface of the first glass plate 10. In T2, taking 0.76 PVB (18%) as an example, 0.76 indicates that the thickness of the first adhesive layer 50 is, for example, 0.76 mm, and 18% indicates that the transmittance of the first adhesive layer 50 is 18%. In T3, " / " indicates that there is no PDLC, in other words, PDLC is omitted. In T4 and T6, taking 0.38 CPVB as an example, 0.38 indicates that the thickness of the second adhesive layer 60 is, for example, 0.38 mm, and C indicates that the selected second adhesive layer 60 is a transparent material. In T7, taking 2.1C LOW-E as an example, 2.1 indicates that the thickness of the selected second glass plate 40 is 2.1 mm, C indicates that the selected second glass plate 40 is a transparent plate, and LOW-E indicates that an anti-reflection film is provided on the second glass plate 40.

[0065] After comparing and analyzing Table 1 and Table 2 above, we can draw the following conclusions:

[0066] According to Comparative Examples 1 and 2, adding an anti-reflection film on the second glass plate 40 can significantly reduce the degree of specular reflection.

[0067] According to Comparative Example 1, Comparative Example 3 to Comparative Example 5, and any one of Examples 1 to 5, it can be seen that reducing TL min with TL max It can improve the clarity of the projected display; the halo is significantly reduced after adding black PDLC; when TL min When TL is less than 0.25%, the degree of specular reflection increases significantly. min with TL max After the reduction, although the clarity of the projected display can be improved, at the same time, the degree of mirror reflection will min decreased and increased significantly.

[0068] According to Comparative Example 6 and any one of Examples 1 to 7, when TL max When TL is 1.41%, the mirror reflection is not obvious in the dark state; when TL max When TL is 0.27%, the mirror reflection is very obvious in the dark state; when TL max ≥1.41%, for example, when it is 2.29%, the degree of mirror reflection in the dark state is not obvious, for example, when it is 3.17%, the degree of mirror reflection in the dark state is not obvious, for example, when it is 3.50%, the degree of mirror reflection in the dark state is not obvious, for example, when it is 1.57%, the degree of mirror reflection in the dark state is not obvious, for example, when it is 1.9%, the degree of mirror reflection in the dark state is not obvious.

[0069] According to Comparative Example 2 and any one of Examples 1 to 7, after combining PDLC, on the basis of meeting the haze ≥ 98%, TL min When the TL is 0.4%, 0.65%, 0.9%, 2.33%, 1.1%, 0.36% or 0.62%, the min When it is 36%, the improvement of halo is more significant.

[0070] According to the comparison between Comparative Example 1 and Example 4, TL min The dark projection effect of 2.33%+haze 98% is similar to TL min The dark state projection effect is basically the same as that of 1.2%.

[0071] According to the comparison between Comparative Example 1 and other comparative examples and Example 1 to Example 7, when the second glass plate 40 is provided with an anti-reflection film on the side facing the internal environment, such as Comparative Examples 2 to 7 and Example 1 to 7, the specular reflectance RL' is 1% to 8%; on the contrary, when the second glass plate 40 is not provided with an anti-reflection film on the side facing the internal environment, such as Comparative Example 1, the specular reflectance RL' is 8.6%.

[0072] According to Comparative Example 7, the total assembly specular reflectance RL0=0.76% without PDLC and projection display bearing layer 30, the haze state projection degree is not clear; according to Comparative Example 2, TL min =36%, even if RL0=15.9%, the haze state projection degree is still very unclear; combined with other comparative examples and examples, when RL0>10%, TL min ≤2.33%, the haze state projection degree is very clear;

[0073] According to Comparative Example 1, when RL' is 8.6%, the haze state specular reflectance degree is very obvious; according to Comparative Examples 4 to 6, even if RL' is any value of 1% to 8%, but TL max are 0.4%, 0.88%, 0.27% respectively, the haze state specular reflectance degree is still very obvious; combined with Example 1 to 7, when RL' is any value of 1% to 8%, and TL max ≥1.41%, the haze state specular reflectance degree is not obvious;

[0074] According to Example 1 to 7, compared with Comparative Examples 1 to 7, the performance of the projection display glass, including the projection clarity in dark state, the halo degree in dark state, the specular reflectance degree in dark state, the field of view clarity in dark state, etc., is greatly or comprehensively improved.

[0075] In summary: 0.25%≤TL min ≤2.33%, the total assembly haze of the projection display glass in dark state is ≥98%, RL0>10%, TL max ≥1.41%, 1%≤RL'≤8%, through the above parameter design, the display effect of the internal environment under sunlight can be improved, that is, the projection is clear, the halo degree is small, and the specular reflectance degree is small.

[0076] The technical features of the above examples can be combined in any way. In order to make the description simple, not all possible combinations of the technical features in the above examples are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description.

[0077] The above embodiments only express several implementation ways of the present application, and the description is specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A projection display glass, characterized in that: The projection display glass comprises: A first glass plate, a dimming layer, a display carrier layer, and a second glass plate are stacked in sequence; the first glass plate faces the external environment, and the second glass plate faces the internal environment; an anti-reflection film is provided on the side of the second glass plate facing the internal environment; the specular reflectivity of the side of the second glass plate facing the internal environment is RL', 1%≤RL'≤8%; When the dimming layer is in a dark state, the total haze of the projection display glass is ≥98%, and the total transmittance of the projection display glass is TL min , 0.25%≤TL min ≤2.33%; When the dimming layer is in the bright state, the total transmittance of the projection display glass is TL max , TL max ≥1.41%; The projection display glass has an overall reflectivity of RL0 on the side facing the internal environment, and RL0>10%.

2. The projection display glass according to claim 1, wherein: The dimming layer is PDLC. When the PDLC is in a dark state, the haze of the PDLC is ≥95%; when the PDLC is in a bright state, the haze of the PDLC is ≤5%.

3. The projection display glass according to claim 2, characterized in that: The PDLC includes black PDLC and / or gray PDLC.

4. The projection display glass according to claim 2, wherein: The transmittance of the PDLC in a dark state is set to 1% to 30%; the transmittance of the PDLC in a bright state is set to 10% to 52%.

5. The projection display glass according to claim 1, wherein: The projection display glass further includes a first adhesive layer disposed between the first glass plate and the dimming layer, a second adhesive layer disposed between the dimming layer and the display bearing layer, and a third adhesive layer disposed between the display bearing layer and the second glass plate.

6. The projection display glass according to claim 5, characterized in that: The transmittance of the first adhesive layer and / or the second adhesive layer is set to 2% to 20%; and / or the third adhesive layer is set to a transparent adhesive material.

7. The projection display glass according to claim 1, wherein: The second glass plate is clear glass or ultra-clear glass; and / or RL0≤17%.

8. The projection display glass according to claim 1, wherein: The mirror reflectivity of the anti-reflection film is ≤4%.

9. The projection display glass according to claim 1, wherein: The display bearing layer is a photonic film.

10. A means of transport, characterized in that: The vehicle comprises the projection display glass according to any one of claims 1 to 9.

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