Display device and optical apparatus

Abstract

The invention relates to a display device and optical equipment, the display device comprises a display panel and a first light control layer, the display panel is configured to emit first light, the first light control layer is arranged on the light emitting side of the display panel, the first light control layer comprises first cholesteric liquid crystal, the first cholesteric liquid crystal is configured to reflect light of an infrared band, and the first light control layer is arranged on the light emitting side of the display panel. The first light penetrates through the first lens; according to the display device, the selective reflection characteristic of the first cholesteric liquid crystal to light is utilized, the infrared light is reflected through the first light control layer, the infrared light entering the display device is reduced, then the influence of heat generated by ambient light on all components or film layers in the display device is reduced, and the heat management efficiency of optical equipment is improved.

Description

Technical Field

[0001] This application relates to the field of display technologies, and in particular, to a display device and an optical device. Background Art

[0002] Head Up Display (HUD) improves the safety and efficiency of operations by reducing the line-of-sight shift of drivers or operators, and is one of the important technologies in modern transportation vehicles and equipment.

[0003] There is a problem of sunlight backflow in in-vehicle HUD. The so-called sunlight backflow means that sunlight enters the HUD system along the path of the outgoing light. Due to the convergence of light, a large amount of heat will accumulate in the HUD system. The larger the Field Of View (FOV), the more light enters the HUD system, and the greater the heat, which has an adverse impact on the entire HUD system.

[0004] Therefore, how to improve the thermal management of the HUD system is an urgent problem to be solved currently. Summary of the Invention

[0005] Embodiments of this application provide a display device and an optical device, which can reduce the ambient light that backflows into the optical device, improve the influence of the heat generated by the ambient light entering the optical device on the entire optical device, and thus improve the thermal management efficiency.

[0006] This application provides a display device, which includes:

[0007] A display panel configured to emit first light; and

[0008] A first light control layer disposed on the light-emitting side of the display panel. The first light control layer includes a first cholesteric liquid crystal, and the first cholesteric liquid crystal is configured to reflect light in the infrared band and transmit the first light.

[0009] In some embodiments, the display device further includes a second light control layer. The second light control layer is disposed on the side of the first light control layer away from the display panel. The second light control layer includes a second cholesteric liquid crystal, and the second cholesteric liquid crystal is configured to reflect light in the infrared band.

[0010] In some embodiments, the helical direction of the first cholesteric liquid crystal is opposite to that of the second cholesteric liquid crystal.

[0011] In some embodiments, the display device further includes a first wave plate. The first wave plate is disposed between the first light control layer and the second light control layer, and the first wave plate includes a half-wave plate;

[0012] Among them, the helical direction of the first cholesteric liquid crystal is the same as that of the second cholesteric liquid crystal.

[0013] In some embodiments, the first light control layer includes:

[0014] A first substrate disposed on the light-emitting side of the display panel;

[0015] A first electrode layer disposed on a side of the first substrate away from the display panel;

[0016] A first liquid crystal layer disposed on a side of the first electrode layer away from the first substrate, and the first liquid crystal layer includes the first cholesteric liquid crystal;

[0017] A second electrode layer disposed on a side of the first liquid crystal layer away from the first electrode layer; and

[0018] A second substrate disposed on a side of the second electrode layer away from the first liquid crystal layer;

[0019] The second light control layer includes:

[0020] A third substrate disposed on a side of the second substrate away from the second electrode layer;

[0021] A third electrode layer disposed on a side of the third substrate away from the second substrate;

[0022] A second liquid crystal layer disposed on a side of the third electrode layer away from the third substrate, and the second liquid crystal layer includes the second cholesteric liquid crystal;

[0023] A fourth electrode layer disposed on a side of the second liquid crystal layer away from the third electrode layer; and

[0024] A fourth substrate disposed on a side of the fourth electrode layer away from the second liquid crystal layer.

[0025] In some embodiments, the first light control layer includes a first polymer film, and the first polymer film includes the first cholesteric liquid crystal;

[0026] The second light control layer includes a second polymer film, and the second polymer film includes the second cholesteric liquid crystal.

[0027] In some embodiments, the reflection wavelength range of the first cholesteric liquid crystal is 700 nm to 1400 nm, and the reflection wavelength range of the second cholesteric liquid crystal is 700 nm to 1400 nm;

[0028] Alternatively, the reflection wavelength range of the first cholesteric liquid crystal is 700 nm to M nm, and the reflection wavelength range of the second cholesteric liquid crystal is M nm to 1400 nm, where 700 < M < 1400.

[0029] In some embodiments, the display device further includes:

[0030] A second wave plate disposed on a side of the display panel close to the first light control layer. The second wave plate includes a quarter-wave plate. The first light forms a second light after passing through the second wave plate, and the polarization direction of the second light is opposite to the helical direction of the first cholesteric liquid crystal;

[0031] And / or an anti-reflection layer disposed on a side of the display panel close to the first light control layer.

[0032] The present application provides an optical device, which includes the display device as described above; and

[0033] A reflection structure disposed on a light-emitting side of the display device.

[0034] In some embodiments, the optical device further includes:

[0035] A heat insulation layer disposed on at least one side of the reflection structure.

[0036] The present application provides a display device and an optical device. The display device provided by the present application can be used for a head-up display (HUD). The display device of the present application includes a display panel and a first light control layer disposed on a light-emitting side of the display panel. The first light control layer includes a first cholesteric liquid crystal. The first cholesteric liquid crystal can transmit the light emitted from the display surface and simultaneously reflect the light in the infrared band in the ambient light. The present application utilizes the selective reflection characteristic of the first cholesteric liquid crystal to reflect the infrared light through the first light control layer, reduce the infrared light from entering the interior of the display device, and further reduce the influence of the heat generated by the ambient light on the components or film layers in the display device, so as to improve the thermal management efficiency of the optical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0039] Figure 1 It is a schematic structural diagram of one of the display devices provided by the embodiments of the present application;

[0040] Figure 2 It is a schematic structural diagram of one of the display devices provided by the embodiments of the present application;

[0041] Figure 3 It is an infrared cholesteric liquid crystal reflection spectrum provided by the embodiments of the present application;

[0042] Figure 4 It is a schematic structural diagram of one of the display devices provided by the embodiments of the present application;

[0043] Figure 5 It is a schematic structural diagram of one of the display devices provided by the embodiments of the present application;

[0044] Figure 6 It is a schematic structural diagram of one of the display devices provided by the embodiments of the present application;

[0045] Figure 7 It is a schematic structural diagram of one of the display devices provided by the embodiments of the present application;

[0046] Figure 8 It is a schematic structural diagram of an optical device provided by the embodiments of the present application.

[0047] Explanation of reference numerals:

[0048] 100, display device; 110, display panel; 111, array substrate; 112, third liquid crystal layer; 113, color filter substrate; 120, first light control layer; 121, first substrate; 122, first electrode layer; 123, first liquid crystal layer; 124, second electrode layer; 125, second substrate; 130, second light control layer; 131, third substrate; 132, third electrode layer; 133, second liquid crystal layer; 134, fourth electrode layer; 135, fourth substrate; 140, first wave plate; 150, second wave plate; 160, anti-reflection layer; 170, backlight module; 200, reflection structure; 210, windshield; 220, reflection component; 230, heat insulation layer. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0050] The present application provides a display device 100. Please refer toFigure 1 , the display device 100 includes a display panel 110 and a first light control layer 120. The display panel 110 is capable of emitting first light. The first light control layer 120 is disposed on the light-emitting side of the display panel 110. The first light control layer 120 includes a first cholesteric liquid crystal, and the first cholesteric liquid crystal is configured to reflect light in the infrared band and transmit the first light.

[0051] Cholesteric liquid crystal is a liquid crystal material with a helical structure formed by mixing nematic liquid crystal and chiral additive. This helical structure enables cholesteric liquid crystal to selectively reflect circularly polarized light with the same direction as its own helical structure direction, while almost completely transmitting circularly polarized light with the opposite direction to its helical structure direction. Different chiral additive concentrations can control the pitch (2P) of cholesteric liquid crystal, and cholesteric liquid crystals with different pitches have a reflecting effect on light of different wavelengths. When the wavelength of the incident light satisfies (n is the effective refractive index of cholesteric liquid crystal, P is the half pitch of cholesteric liquid crystal, is the incident angle), when the polarization rotation direction (left-handed circularly polarized light or right-handed circularly polarized light) of the incident light is consistent with the chiral direction of the cholesteric liquid crystal, the incident light is reflected. Therefore, in this application, by utilizing the above characteristics of cholesteric liquid crystal, the first cholesteric liquid crystal capable of reflecting light in the infrared band is used to form the first light control layer 120, and the first light control layer 120 is disposed on the light-emitting surface of the display panel 110. When ambient light is incident on the surface of the display device 100, the first light control layer 120 can reflect the infrared light that mainly generates heat in the ambient light, thereby reducing the infrared light entering the interior of the display device 100 and reducing the heat generated by the ambient light entering the display device 100, so as to improve the influence of the heat generated by the ambient light on the display device 100.

[0052] In some embodiments, please refer to Figure 2 , the display device 100 further includes a second light control layer 130. The second light control layer 130 is disposed on the side of the first light control layer 120 away from the display panel 110. The second light control layer 130 includes a second cholesteric liquid crystal, and the second cholesteric liquid crystal is configured to reflect light in the infrared band and transmit the first light. In this application, the stacking of multiple light control layers can further enhance the overall reflection of infrared light by the display device 100 and further improve the influence of the heat generated by the ambient light on the display device 100.

[0053] Among them, the helical direction of the first cholesteric liquid crystal and the helical direction of the second cholesteric liquid crystal may be the same or different, and the pitch of the first cholesteric liquid crystal and the pitch of the second cholesteric liquid crystal may also be the same or different, which can be specifically set according to the performance requirements of different display devices 100.

[0054] In some embodiments, the helical direction of the first cholesteric liquid crystal is opposite to that of the second cholesteric liquid crystal. For example, the helical direction of the first cholesteric liquid crystal is left-handed, and the helical direction of the second cholesteric liquid crystal is right-handed, or the helical direction of the first cholesteric liquid crystal is right-handed, and the helical direction of the second cholesteric liquid crystal is left-handed.

[0055] The periodicity of the helical structure of cholesteric liquid crystals enables them to reflect light within a specific wavelength range, and a cholesteric liquid crystal with a single helical sense only reflects circularly polarized light consistent with its helical direction. When two cholesteric liquid crystals with different helical senses are superimposed, a superimposition effect will occur, and their selective reflection characteristics will be complementary, enabling total reflection of all light in the infrared band and significantly improving the reflection effect.

[0056] In addition, when infrared light enters the display device 100, the infrared light is reflected multiple times between the optical elements of the display device 100, forming stray light, which reduces the display contrast. In this application, the first light control layer 120 and the second light control layer 130 can reflect infrared light, reducing the entry of infrared light into the display device 100. Therefore, the interference of infrared light is also reduced simultaneously, enhancing the display contrast. Thus, while using the first light control layer 120 and the second light control layer 130 to reduce the thermal load, the display device 100 of this application can effectively improve the display contrast of the display device 100.

[0057] In some embodiments, the helical direction of the first cholesteric liquid crystal may also be the same as that of the second cholesteric liquid crystal. For example, the helical directions of both the first cholesteric liquid crystal and the second cholesteric liquid crystal are left-handed, or the helical directions of both the first cholesteric liquid crystal and the second cholesteric liquid crystal are right-handed.

[0058] Please refer to Figure 3, when the helical directions of the first cholesteric liquid crystal and the second cholesteric liquid crystal are the same, a first wave plate 140 can be added to the display device 100. The first wave plate 140 is disposed between the first light control layer 120 and the second light control layer 130, and the first wave plate 140 can be a half-wave plate. The first wave plate 140 can change the polarization state of light. For example, after the light passes through the first wave plate 140, the polarization direction can be rotated by 90°. When the helical direction of the second cholesteric liquid crystal in the second light control layer 130 is left-handed, the first wave plate 140 can convert the light passing through the second light control layer 130 into right-handed, while the helical direction of the first cholesteric liquid crystal in the first light control layer 120 is left-handed. When the helical direction of the second cholesteric liquid crystal in the second light control layer 130 is right-handed, the first wave plate 140 can convert the light passing through the second light control layer 130 into left-handed, while the helical direction of the first cholesteric liquid crystal in the first light control layer 120 is right-handed. Therefore, when the helical directions of the first cholesteric liquid crystal and the second cholesteric liquid crystal are the same, by disposing the first wave plate 140 between the first light control layer 120 and the second light control layer 130, the same reflection effect as when the helical directions of the first cholesteric liquid crystal and the second cholesteric liquid crystal are opposite in the above embodiment can be achieved, and total reflection of light in the infrared band can be realized.

[0059] In some embodiments, please refer to Figure 2 , the first light control layer 120 and the second light control layer 130 can be light control liquid crystal cells.

[0060] The first light control layer 120 includes a first substrate 121, a first electrode layer 122, a first liquid crystal layer 123, a second electrode layer 124, and a second substrate 125. The first substrate 121 is disposed on the light-emitting side of the display panel 110; the first electrode layer 122 is disposed on the side of the first substrate 121 away from the display panel 110; the first liquid crystal layer 123 is disposed on the side of the first electrode layer 122 away from the first substrate 121; the second electrode layer 124 is disposed on the side of the first liquid crystal layer 123 away from the first electrode layer 122; the second substrate 125 is disposed on the side of the second electrode layer 124 away from the first liquid crystal layer 123. Among them, the first substrate 121 and the second substrate 125 can be glass or polyimide; the materials of the first electrode layer 122 and the second electrode layer 124 can be the transparent electrode indium tin oxide (ITO); the material of the first liquid crystal layer 123 includes the first cholesteric liquid crystal.

[0061] The second light control layer 130 includes a third substrate 131, a third electrode layer 132, a second liquid crystal layer 133, a fourth electrode layer 134, and a fourth substrate 135. The third substrate 131 is disposed on a side of the second substrate 125 away from the second electrode layer 124; the third electrode layer 132 is disposed on a side of the third substrate 131 away from the second substrate 125; the second liquid crystal layer 133 is disposed on a side of the third electrode layer 132 away from the third substrate 131; the fourth electrode layer 134 is disposed on a side of the second liquid crystal layer 133 away from the third electrode layer 132; the fourth substrate 135 is disposed on a side of the fourth electrode layer 134 away from the second liquid crystal layer 133. Among them, the third substrate 131 and the fourth substrate 135 can be glass or polyimide; the materials of the third electrode layer 132 and the fourth electrode layer 134 can be the transparent electrode indium tin oxide (ITO); the material of the second liquid crystal layer 133 includes the second cholesteric liquid crystal.

[0062] Among them, in the formation process of the first light control layer 120, the liquid crystal mixture can be first mixed with the chiral additive, and the mixed liquid crystal material can be injected between the first substrate 121 and the second substrate 125 to form a liquid crystal cell, and then the liquid crystal cell is placed under low-intensity ultraviolet light for a polymerization reaction. Due to the different reaction rates of the chiral additive to ultraviolet light, a concentration gradient of the chiral additive is generated in the liquid crystal cell, and then a pitch gradient is generated in the liquid crystal cell, forming the first cholesteric liquid crystal. By adjusting the content of the chiral additive, the pitch of the first cholesteric liquid crystal can be adjusted, and then the reflection wavelength of the first cholesteric liquid crystal can be controlled to obtain the first cholesteric liquid crystal capable of reflecting the infrared light band, so that the first light control layer 120 can reflect infrared light.

[0063] The formation process of the second light control layer 130 is similar to that of the first light control layer 120, and reference can be made to the formation process of the first light control layer 120, which will not be elaborated here.

[0064] For example, the present application provides a single-helix infrared cholesteric liquid crystal, which can be used as the first cholesteric liquid crystal in the first light control layer 120 or as the second cholesteric liquid crystal in the second light control layer 130. Please refer to Figure 4 , Figure 4This is the reflection spectrum of the infrared cholesteric liquid crystal. The reflection peak of this infrared cholesteric liquid crystal is located at 800 nm, the reflection bandwidth is 130 nm, and the reflectivity is 59.2% @ 800 nm. Here, 59.2% @ 800 nm means that the reflectivity of light with a wavelength of 800 nm is 59.2%. This infrared cholesteric liquid crystal can achieve the reflection of infrared light in a specific band. Among them, this infrared cholesteric liquid crystal can be obtained through market purchase. Cholesteric liquid crystals that can reflect infrared light in other reflection bands can also be obtained through market purchase. Specifically, the corresponding cholesteric liquid crystal can be selected according to the performance requirements of different display devices 100.

[0065] In this application, by adding different amounts or different types of chiral additives to the liquid crystal composition, the reflection bandwidth of the first cholesteric liquid crystal or the second cholesteric liquid crystal can be adjusted to obtain the first cholesteric liquid crystal or the second cholesteric liquid crystal with a wider reflection bandwidth. The reflection bandwidth of the first cholesteric liquid crystal or the second cholesteric liquid crystal can reach 300 nm to 1000 nm. The wider the reflection bandwidth of the first cholesteric liquid crystal or the second cholesteric liquid crystal for infrared light, the higher its reflectivity, and it can more effectively reduce the thermal influence generated by infrared light and is more effective in heat control.

[0066] In some embodiments, please refer to Figure 5 , the first light control layer 120 and the second light control layer 130 can be polymer films formed by cholesteric liquid crystals. For example, a polymer containing cholesteric liquid crystals can be coated on a polyethylene terephthalate (PET) substrate or a glass substrate by coating to form a cholesteric liquid crystal polymer film with the function of reflecting infrared light, or a polymer containing cholesteric liquid crystals can be directly coated on the light-emitting side surface of the display panel 110 to form a cholesteric liquid crystal polymer film with the function of reflecting infrared light. By adopting this method, the process can be simplified, the structure of the display device 100 can be simplified, and the cost can be reduced.

[0067] Specifically, the above cholesteric liquid crystal polymer film can be formed by mixing liquid crystal monomers, chiral additives, and polymers and then curing the film by light irradiation. During the light irradiation curing process, the helical direction and pitch of the cholesteric liquid crystals in the polymer film are fixed. In the process of preparing the cholesteric liquid crystal polymer film, by adjusting the type, content, and light irradiation conditions of the chiral additives, a cholesteric liquid crystal polymer film with a specific helical direction and reflecting infrared light in a specific band can be formed to meet the requirements of different conditions.

[0068] In the present application, the first light control layer 120 includes a first polymer film, and the first polymer film includes the first cholesteric liquid crystal; the second light control layer 130 includes a second polymer film, and the second polymer film includes the second cholesteric liquid crystal. Both the first polymer film and the second polymer film have the function of reflecting light in the infrared band.

[0069] It should be noted that the display device 100 of the present application is not limited to including the first light control layer 120 and the second light control layer 130. The display device 100 may further include a third light control layer, a fourth light control layer or more stacked light control layers. The number of the light control layers can be set according to the performance requirements of the display device 100, and the present application does not make any restrictions. Among them, the structures of the third light control layer, the fourth light control layer or more light control layers are similar to the structure of the first light control layer 120 or the second light control layer 130, and will not be elaborated here.

[0070] In some embodiments, the reflection wavelength range of the first cholesteric liquid crystal may be the same as the reflection wavelength range of the second cholesteric liquid crystal, that is, the pitch of the first cholesteric liquid crystal is the same as that of the second cholesteric liquid crystal. The first light control layer 120 and the second light control layer 130 can reflect light in the near-infrared band. For example, the reflection wavelength range of the first cholesteric liquid crystal is 700 nm to 1400 nm, and the reflection wavelength range of the second cholesteric liquid crystal is 700 nm to 1400 nm.

[0071] In some embodiments, the reflection wavelength range of the first cholesteric liquid crystal may be different from the reflection wavelength range of the second cholesteric liquid crystal, that is, the pitch of the first cholesteric liquid crystal is different from that of the second cholesteric liquid crystal. The reflection wavelength range of the first cholesteric liquid crystal is 700 nm to M nm, and the reflection wavelength range of the second cholesteric liquid crystal is M nm to 1400 nm, where 700 < M < 1400. For example, the reflection wavelength range of the first cholesteric liquid crystal is 700 nm to 940 nm, and the reflection wavelength range of the second cholesteric liquid crystal is 940 nm to 1400 nm, where M = 940, but not limited thereto. By making the first cholesteric liquid crystal and the second cholesteric liquid crystal reflect infrared light in different bands respectively, the combination of the reflection bands of the first cholesteric liquid crystal and the second cholesteric liquid crystal can cover the light in the entire near-infrared band. The first cholesteric liquid crystal and the second cholesteric liquid crystal respectively cover a smaller reflection band range, which is beneficial to the selection and realization of the cholesteric liquid crystal material.

[0072] In some other embodiments, the reflection wavelength range of the first cholesteric liquid crystal may cover the near-infrared band (700 nm to 1400 nm), and the reflection wavelength range of the second cholesteric liquid crystal may cover the mid-infrared band (1400 nm to 3000 nm), so as to expand the overall reflection wavelength range of infrared light of the first light control layer 120 and the second light control layer 130 to meet the application requirements of different products.

[0073] In some embodiments, please refer to Figure 6 , the display device 100 further includes a second wave plate 150. The second wave plate 150 is disposed on a side of the display panel 110 close to the first light control layer 120, and the second wave plate 150 may be a quarter-wave plate. The second wave plate 150 can convert the linearly polarized light emitted from the display panel 110 into circularly polarized light to match the selective reflection characteristics of the first light control layer 120 above the display panel 110, thereby improving the light transmittance. Specifically, the fast axis direction of the quarter-wave plate can be adjusted according to system requirements. The first light emitted from the display panel 110 is linearly polarized light. After passing through the quarter-wave plate, the first light is converted into a second light, and the second light is circularly polarized light (left-handed circularly polarized light or right-handed circularly polarized light). The polarization direction of the second light is opposite to the helical direction of the first cholesteric liquid crystal of the first light control layer 120. The cholesteric liquid crystal can allow the circularly polarized light with a direction opposite to its helical structure direction to pass through almost completely. Therefore, the transmittance of the light emitted from the display panel 110 when passing through the first light control layer 120 can be improved, so as to reduce the influence of the first light control layer 120 and the second light control layer 130 on the light emitted from the display panel 110, ensure the high transmittance of the display device 100, and improve the light utilization rate.

[0074] In some embodiments, please refer to Figure 7 , the display device 100 further includes an antireflection layer 160. The antireflection layer 160 is disposed on a side of the display panel 110 close to the first light control layer 120. The antireflection layer 160 can reduce the reflected light on the surface of the display panel 110, reduce the light loss on the surface of the display panel 110, and at the same time reduce the influence on the contrast and brightness of the displayed image, thereby improving the optical efficiency and display brightness of the display device 100. The antireflection layer 160 can be directly formed on the light-emitting side surface of the display panel 110 by coating, or a film with the antireflection layer 160 can be attached to the light-emitting side surface of the display panel 110.

[0075] In this application, please refer to Figure 2, the display panel 110 may be a liquid crystal display panel 110, but is not limited thereto. Taking the liquid crystal display panel as an example, the display panel 110 includes an array substrate 111, a third liquid crystal layer 112, and a color filter substrate 113. The array substrate 111 and the color filter substrate 113 are disposed opposite to each other. The third liquid crystal layer 112 is located between the array substrate 111 and the color filter substrate 113. The first light control layer 120 is located on a side of the color filter substrate 113 away from the third liquid crystal layer 112.

[0076] Furthermore, the display device 100 further includes a backlight module 170. The backlight module 170 is disposed on a side of the display panel 110 away from the first light control layer 120 and is configured to provide a backlight source for the display panel 110.

[0077] This application also provides an optical device. The optical device may be a head-up display (HUD) optical device, but is not limited thereto.

[0078] Please refer to Figure 8 , the optical device includes the display device 100 and a reflection structure 200 as described above. The reflection structure 200 is disposed on a light-emitting side of the display device 100. The reflection structure 200 includes a windshield 210 and a reflection component 220 located on a side of the windshield 210 close to the display device 100. The display device 100 is configured to generate image information to be displayed. The light emitted from the display device 100 first enters the reflection component 220 and then is reflected by the reflection component 220 into the driver's eyes. The driver can see a virtual image through the windshield 210, so as to present important information displayed on the display device in the form of a virtual image in front of the driver's line of sight, which is beneficial to improving driving safety and convenience.

[0079] This application realizes thermal management of the optical device by disposing the first light control layer 120 and the second light control layer 130 on the light-emitting side of the display panel 110, reducing the adverse effect on the optical device caused by infrared light entering the optical device to generate heat. The display device 100 of this application does not need to perform special pixel design on the display area of the display panel 110, does not affect the normal display of the display area, and can realize effective thermal management of the entire optical device without affecting the structure of the display panel 110, improving the performance and service life of the optical device.

[0080] In some embodiments, the optical device further includes a heat insulation layer 230 disposed on at least one side of the reflection structure 200. For example, the heat insulation layer 230 may be disposed on the side of the windshield 210 away from the reflection component 220, but is not limited thereto. The heat insulation film can further reduce the influence of the heat generated by the ambient light on the optical device. By using the first light control layer 120, the second light control layer 130 and the heat insulation layer 230 in combination, a dual thermal management is formed, which can further reduce the heat of the optical device and reduce the risk of thermal damage to each component in the optical device, thereby prolonging the service life of the optical device.

[0081] This application provides a display device and an optical device. The display device provided by this application can be used for a head-up display (HUD). The display device of this application includes a display panel and a first light control layer disposed on the light-emitting side of the display panel. The first light control layer includes a first cholesteric liquid crystal, and the first cholesteric liquid crystal can reflect light in the infrared band. By utilizing the selective reflection characteristic of the first cholesteric liquid crystal to light, the infrared light is reflected by the first light control layer, reducing the infrared light entering the interior of the display device, and further reducing the influence of the heat generated by the ambient light on each component or film layer in the display device, so as to improve the thermal management efficiency of the optical device.

[0082] In the description of this application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality" means two or more, unless otherwise specifically defined.

[0083] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0084] The embodiments, implementation manners and related technical features of this application can be combined and replaced with each other without conflict.

[0085] The above are only the preferred embodiments of this application and do not impose any form of limitation on this application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application still fall within the scope of the technical solution of this application.

Claims

1. A display device, characterized in that, Comprising: A display panel configured to emit first light; And A first light control layer disposed on the light-emitting side of the display panel, the first light control layer including a first cholesteric liquid crystal configured to reflect light in the infrared band and transmit the first light.

2. The display device according to claim 1, wherein The display device further includes a second light control layer disposed on a side of the first light control layer away from the display panel, the second light control layer including a second cholesteric liquid crystal configured to reflect light in the infrared band and transmit the first light.

3. The display device according to claim 2, wherein The helical direction of the first cholesteric liquid crystal is opposite to that of the second cholesteric liquid crystal.

4. The display device according to claim 2, wherein, The display device further includes a first wave plate disposed between the first light control layer and the second light control layer, the first wave plate including a half-wave plate; Wherein, the helical direction of the first cholesteric liquid crystal is the same as that of the second cholesteric liquid crystal.

5. The display device according to claim 2, characterized in that, The first light control layer includes: A first substrate disposed on the light-emitting side of the display panel; A first electrode layer disposed on a side of the first substrate away from the display panel; A first liquid crystal layer disposed on a side of the first electrode layer away from the first substrate, the first liquid crystal layer including the first cholesteric liquid crystal; A second electrode layer disposed on a side of the first liquid crystal layer away from the first electrode layer; and A second substrate disposed on a side of the second electrode layer away from the first liquid crystal layer; The second light control layer includes: A third substrate disposed on a side of the second substrate away from the second electrode layer; A third electrode layer disposed on a side of the third substrate away from the second substrate; A second liquid crystal layer disposed on a side of the third electrode layer away from the third substrate, the second liquid crystal layer including the second cholesteric liquid crystal; A fourth electrode layer disposed on a side of the second liquid crystal layer away from the third electrode layer; and A fourth substrate disposed on a side of the fourth electrode layer away from the second liquid crystal layer.

6. The display device according to claim 2, wherein The first light control layer includes a first polymer film including the first cholesteric liquid crystal; The second light control layer includes a second polymer film including the second cholesteric liquid crystal.

7. The display device according to claim 2, wherein The reflection wavelength range of the first cholesteric liquid crystal is 700nm - 1400nm, and the reflection wavelength range of the second cholesteric liquid crystal is 700nm - 1400nm; Or, the reflection wavelength range of the first cholesteric liquid crystal is 700nm - M nm, and the reflection wavelength range of the second cholesteric liquid crystal is M nm - 1400nm, where 700 < M < 1400.

8. The display device according to any one of claims 1 to 7, characterized in that, The display device further includes: A second wave plate disposed on a side of the display panel close to the first light control layer, the second wave plate including a quarter-wave plate, the first light forms a second light after passing through the second wave plate, and the polarization direction of the second light is opposite to the helical direction of the first cholesteric liquid crystal; And / or an anti-reflection layer disposed on a side of the display panel close to the first light control layer.

9. An optical device, characterized in that, Comprising: The display device according to any one of claims 1 to 8; And A reflective structure is provided on the light-emitting side of the display device.

10. The optical device according to claim 9, characterized in that, The optical device further includes: A heat insulation layer is provided on at least one side of the reflective structure.

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