Display device

Abstract

The invention discloses a display device. The display device comprises a liquid crystal display panel; the backlight assembly is located on the non-display side of the liquid crystal display panel and provides backlight for the liquid crystal display panel, the backlight assembly comprises a first backlight assembly, the first backlight assembly comprises at least one first light guide type light guide film assembly, and emergent light of the first backlight assembly has a first beam angle; wherein the angle of the emergent light of the first light guide type light guide film assembly can be realized by controlling the shape and the angle of a light feature extract in the first light guide type light guide film and / or the refractive index difference between different light guide film layers, so that the angle of a first beam angle can be relatively small; for example, emergent light of the first backlight assembly is collimated light, so that the display device can be applied to a privacy display scene, a collimating lens and a light absorption layer do not need to be introduced, and the display device is simple in structure, small in thickness, low in power consumption and high in yield.

Description

Technical Field

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

[0002] With the development of display technology, the application of display devices is becoming more and more common, and has gradually become an indispensable part of people's daily work and life. As the application of display devices becomes more and more common, people have higher and higher demands for privacy display of display devices. For example, in the IT and automotive fields, privacy display can protect user privacy and ensure driving safety. However, the existing display devices with privacy display function have a complex structure, large thickness and low yield. Summary of the invention

[0003] In view of the above problems, the present application provides a display device that has a simple structure, a small thickness, and a high yield rate while achieving privacy display. The specific solution is as follows:

[0004] A display device, comprising:

[0005] Liquid crystal display panel;

[0006] A backlight assembly is located on the non-display side of the liquid crystal display panel and provides backlight for the liquid crystal display panel. The backlight assembly includes a first backlight assembly. The first backlight assembly includes at least one first light-guiding film assembly. The outgoing light of the first backlight assembly has a first beam angle.

[0007] In the display device provided in the embodiment of the present application, the angle of the outgoing light of the first light-guiding film assembly can be achieved by controlling the shape, angle and / or the refractive index difference between different light-guiding film thin film layers of the light characteristic extract in the first light-guiding film, so that the angle of the first light beam can be smaller. For example, the outgoing light of the first backlight assembly is collimated light, and thus the display device can be used in the scenario of privacy display without the introduction of a collimating lens and a light-absorbing layer, with a simple structure, small thickness, low power consumption and high yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0009] Figure 1 A schematic diagram of the structure of a display device provided in this application;

[0010] Figure 2A schematic structural diagram of a first light-guiding light-guide film assembly in a display device provided in the present application;

[0011] Figure 3 A schematic diagram of total reflection in a first coupling lightguide array of light emitted from a first light source in a first lightguide-type lightguide film assembly in a display device provided by the present application;

[0012] Figure 4 A schematic diagram of the relative positions of a light extraction area of ​​a first light guide type light guide film assembly and a display area of ​​a liquid crystal display panel in a display device provided by the present application;

[0013] Figure 5 A schematic diagram of the structure of another display device provided by the present application;

[0014] Figure 6 A schematic diagram of the structure of another display device provided by the present application;

[0015] Figure 7 A schematic diagram of the structure of another display device provided in the present application;

[0016] Figure 8 A schematic diagram of the structure of another display device provided by the present application;

[0017] Fig. 9 A schematic diagram of the structure of another display device provided in the present application;

[0018] Fig.10 A schematic diagram of the structure of another display device provided by the present application;

[0019] Fig.11 A schematic structural diagram of a second light-guiding light-guide film assembly in a display device provided in the present application;

[0020] Fig.12 A schematic diagram of the structure of another display device provided in the present application;

[0021] Fig.13 A schematic diagram of the outgoing light beams of the first backlight assembly and the second backlight assembly when the first backlight assembly and the second backlight assembly work simultaneously in a display device provided by an embodiment of the present application;

[0022] Fig.14 A schematic diagram of the structure of another display device provided by the present application;

[0023] Fig.15 A schematic diagram of the structure of another display device provided in the present application;

[0024] Fig.16 This is a schematic structural diagram of another display device provided in the present application. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the embodiments in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0026] It is obvious to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit or scope of the present application. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] As described in the background technology section, the existing display device with a privacy display function has a complex structure, a large thickness, and a low yield.

[0029] This is because existing display devices with privacy display functions usually use a conventional backlight source plus a collimating lens to achieve light emission with a small beam angle, so that the display panel in the display device has a smaller viewing angle when displaying based on the light of the small beam angle, and privacy display can be achieved. However, the structure of achieving light emission with a small beam angle by using a conventional backlight source plus a collimating lens is relatively complex and thicker, and the more complex the structure, the lower the yield during its assembly, which makes the existing display devices with privacy display functions more complex, thicker, and have a lower yield.

[0030] The inventors have found that a conventional backlight source can be used directly as the backlight of the display panel in the display device, and a light-absorbing layer can be installed to absorb light at a large angle, so that the display device can achieve privacy display. However, the display device that adds a light-absorbing layer to achieve privacy display consumes a lot of power.

[0031] In view of this, an embodiment of the present application provides a display device, such as Figure 1 As shown, the display device includes:

[0032] Liquid crystal display panel 10;

[0033] A backlight assembly 20 is located on the non-display side of the liquid crystal display panel 10 and provides backlight for the liquid crystal display panel 10. The backlight assembly 20 includes a first backlight assembly 21. The first backlight assembly 21 includes at least one first light-guiding film assembly. The outgoing light of the first backlight assembly 21 has a first beam angle.

[0034] Continue as Figure 1 As shown, in one embodiment of the present application, the liquid crystal display panel 10 includes a first substrate 11 and a second substrate 12 arranged opposite to each other, a first liquid crystal layer 13 located between the first substrate 11 and the second substrate 12, a first polarizer 14 located on a side of the first substrate 11 away from the second substrate 12, and a second polarizer 15 located on a side of the second substrate 12 away from the first substrate 11.

[0035] Specifically, Figure 2 As shown, the first light-guide type light-guiding film assembly includes: a first light-guide type light-guiding film 31, a first light source 32 and a first coupling light-guiding array 33, wherein the first light-guide type light-guiding film 31 is connected to the first light source 32 through the first coupling light-guiding array 33, and the first light source 32 includes at least one LED. When working, the light emitted by the first light source 32 is transmitted by total reflection in the first coupling light-guiding array 33, as shown in FIG. Figure 3 As shown, Figure 3 The middle area A shows a schematic diagram of the total reflection of the light emitted by the first light source 32 in the first coupling waveguide array 33, until it is emitted from the first coupling waveguide array and incident on the light extraction area of ​​the first waveguide type light guide film 31, and is hindered from total reflection by the light characteristic extract of the light extraction area in the first waveguide type light guide film 31, so that the light is reflected away from the first waveguide type light guide film 31, which can provide backlight for the liquid crystal display panel.

[0036] On the basis of the above embodiments, in one embodiment of the present application, the first light-guiding light-guiding film is composed of at least one layer of light-guiding film thin film stack. In specific applications, the purpose of controlling the light emission angle can be achieved by controlling the shape, angle and / or refractive index difference between different light-guiding film thin film layers of the light characteristic extract in the first light-guiding light-guiding film, thereby controlling the light emission angle of the first light-guiding light-guiding film assembly. Optionally, in one embodiment of the present application, the light emitted by the first backlight assembly is collimated light, so that the display device can be applied to the scene of privacy display.

[0037] Specifically, in one embodiment of the present application, the first light-guiding light-guiding film is composed of at least two light-guiding film layers stacked together, and the thickness of the first light-guiding light-guiding film ranges from 0.05 mm to 0.5 mm, but the present application does not limit this, depending on the specific circumstances.

[0038] It should be noted that, in this embodiment, Figure 4 As shown, the light extraction area C of the first light-guiding light-guide film assembly covers the display area B of the liquid crystal display panel, that is, the light extraction area of ​​the first light-guiding light-guide film covers the display area of ​​the liquid crystal display panel, so that each position of the display area of ​​the liquid crystal display panel has backlight. Optionally, in one embodiment of the present application, the light extraction area C of the first light-guiding light-guide film assembly completely covers the display area B of the liquid crystal display panel, and the area of ​​the light extraction area C of the first light-guiding light-guide film assembly is larger than the area of ​​the display area B of the liquid crystal display panel, so as to reduce the difficulty of aligning the light extraction area C of the first light-guiding light-guide film assembly and the display area B of the liquid crystal display panel on the basis of ensuring that the light extraction area C of the first light-guiding light-guide film assembly covers the display area B of the liquid crystal display panel. However, the present application does not limit this and it depends on the specific circumstances.

[0039] It can be seen that in the display device provided in the embodiment of the present application, the angle of the outgoing light of the first light-guiding film assembly can be achieved by controlling the shape, angle and / or the refractive index difference between different light-guiding film thin film layers of the light characteristic extract in the first light-guiding film, so that the angle of the first light beam can be made smaller. For example, the outgoing light of the first backlight assembly is collimated light, and then the display device can be used in the scene of privacy display without introducing a collimating lens and a light-absorbing layer, and has a simple structure, a small thickness, low power consumption and a high yield.

[0040] Optionally, in one embodiment of the present application, the first backlight assembly includes at least two first light-guiding light-guiding film assemblies, and the emission angles of different first light-guiding light-guiding film assemblies are not exactly the same, so that the first backlight assembly can emit light of various beam angles, thereby enabling the display device to be applied to scenes requiring different display viewing angles, such as privacy display scenes and shared display scenes or other scenes. For example, in the field of vehicle-mounted displays, by switching first light-guiding light-guiding film assemblies of different designs, it can be achieved: a narrow viewing angle 1 visible only to the co-pilot, or a narrow viewing angle 2 visible only to the driver, or a wide viewing angle 1 visible only to the driver and co-pilot, and a wide viewing angle 2 visible to all angles, etc.

[0041] Based on any of the above embodiments, in one embodiment of the present application, Figure 5As shown, the backlight assembly 20 also includes: a dimming assembly 22 located between the liquid crystal display panel 10 and the first backlight assembly 21, the dimming assembly 22 includes a first state and a second state, in the first state, the dimming assembly 22 has a modulation effect on the light emitted by the first backlight assembly 21, and modulates the light emitted by the first backlight assembly 21 from a first beam angle to a second beam angle, the second beam angle is greater than the first beam angle, thereby increasing the beam angle of the light emitted by the backlight assembly, and then increasing the display viewing angle of the display device, so that the display device can be applied to application scenarios with a wide viewing angle, in the second state, the dimming assembly 22 has no modulation effect on the light emitted by the first backlight assembly 21, so that the light of the first beam angle emitted by the first backlight assembly 21 is directly used as the backlight of the liquid crystal display panel 10, so that the display device can be applied to application scenarios with a narrow viewing angle.

[0042] Specifically, in one embodiment of the present application, the dimming component is in a first state, such as a foggy state, when no voltage is applied, and has a modulating effect on the outgoing light of the first backlight component, and the display device is applied to a scene with a wide viewing angle (such as a shared display); when a voltage is applied, it is in a second state, such as a transparent state, and has no modulating effect on the outgoing light of the first backlight component, and the display device is applied to a scene with a narrow viewing angle (such as a privacy display); however, the present application does not limit this, and it depends on the specific circumstances.

[0043] Optionally, in one embodiment of the present application, the dimming component includes a third substrate and a fourth substrate that are relatively arranged and a second liquid crystal layer located between the third substrate and the fourth substrate. Specifically, the second liquid crystal layer can be a polymer dispersed liquid crystal layer, so that the dimming component is in a first state when no voltage is applied, and is in a second state when a voltage is applied, but the present application does not limit this and it depends on the specific circumstances.

[0044] Continue as Figure 5 As shown, in one embodiment of the present application, the first light-guiding film of the first light-guiding film assembly in the first backlight assembly 21, the first coupling lightguide array and the first light source are all located below the liquid crystal display panel 10, but the present application is not limited to this. In other embodiments of the present application, the first coupling lightguide array and the first light source may also be other positions in the display device, such as above, on the left or on the right side of the liquid crystal display panel, as long as the first light-guiding film is located below the liquid crystal display panel.

[0045] On the basis of the above embodiments, in one embodiment of the present application, the light provided by the first light-guiding light-guiding film assembly is collimated light. In this embodiment, the L30° / L0° of the outgoing light of the first light-guiding light-guiding film assembly can reach 0.1%, wherein L30° / L0 is a parameter for measuring the divergence angle of the collimated light beam, which represents the ratio of the light intensity of the light beam at a position 30° away from the central axis to the light intensity at the central axis (L0), and is used to evaluate the divergence performance of the collimated light beam. It can be seen that in this embodiment, the first light-guiding light-guiding film can provide collimated light with better collimation, so that the display device can obtain outgoing light with better collimation without the need for a collimating lens or a light-absorbing layer, thereby realizing privacy display.

[0046] Optionally, in one embodiment of the present application, Figure 6 As shown, the backlight assembly 20 also includes: a first reflective element 23 located on the side of the first backlight assembly 21 away from the dimming assembly 22, and the first reflective element 23 is a reflective plate or a reflective polarizer to reflect light directed to the side of the first backlight assembly 21 away from the dimming assembly 22 back to the side where the liquid crystal display panel 10 is located, thereby improving the display brightness of the display device.

[0047] Specifically, in one embodiment of the present application, the reflector may be an enhanced specular reflector (ESR), and the reflective polarizer may be a dual brightness enhancement film (DBEF). The present application does not limit this, and it depends on the specific circumstances.

[0048] It should be noted that ESR uses multi-layer film technology and integrates more than 1,000 layers of thin films, which are stacked in a thickness of less than 200 microns. This structure makes the reflectivity of ESR in the visible light spectrum as high as 98%, and it does not contain any metal. Therefore, it can efficiently reflect light from the light source and is also a more environmentally friendly reflector material.

[0049] DBEF is produced based on layer film technology and contains about 1,000 layers of optical films, which can selectively reflect part of the incident light. Specifically, the incident light is divided into P light and S light. If P light can be transmitted by DBEF, S light will be reflected. Conversely, if S light can be transmitted by DBEF, P light will be reflected. Therefore, a reflective polarizer is arranged on the side of the first backlight component away from the dimming component, which can reflect at least 50% of the light directed to the first backlight component away from the dimming component, thereby improving the utilization rate of the light emitted by the first backlight component, thereby improving the brightness of the display screen of the display device.

[0050] Based on any of the above embodiments, in one embodiment of the present application, Figure 7 As shown, the backlight assembly 20 further includes: a light absorbing layer 24 located on the side of the first backlight assembly 21 away from the dimming assembly 22, so as to absorb stray light emitted from the first backlight assembly 21 to the side away from the dimming assembly 22, but the present application does not limit this, and it depends on the specific situation. It should be noted that in this embodiment, the light absorbing layer 24 is located on the side of the first backlight assembly 21 away from the dimming assembly 22, and will not absorb the light emitted from the first backlight assembly 21 to the side of the liquid crystal display panel 10, so it will not affect the display brightness of the liquid crystal display panel 10, and further, under the premise of display brightness, the power consumption of the display device will not be increased.

[0051] Specifically, in one embodiment of the present application, in the display device composed of the first backlight assembly, the dimming assembly and the liquid crystal display panel, the total thickness of the liquid crystal display panel is approximately 0.5 mm, the thickness of the adhesive between the liquid crystal display panel and the dimming assembly is approximately 0.15 mm, the thickness of the dimming assembly ranges from 0.3 mm to 0.4 mm, the thickness of the adhesive between the dimming assembly and the first backlight assembly is approximately 0.05 mm, and the thickness of the first light-guiding film in the first backlight assembly is approximately 0.05 mm. Therefore, the maximum thickness of the display device provided in this embodiment can reach about 1.05 mm, which is much lower than the thickness of other display devices that can achieve privacy display. Therefore, the display device provided in the embodiment of the present application can achieve a lightweight display device and enhance the competitiveness of the product.

[0052] It should be noted that the above embodiment is described by taking the example that the backlight assembly includes a dimming assembly to enable the display device to switch between private display and shared display. In other embodiments of the present application, the display device can also switch between private display and shared display in other ways.

[0053] Optionally, in one embodiment of the present application, Figure 8As shown, the backlight assembly 20 further includes: a second backlight assembly 25 located on a side of the first backlight assembly 21 away from the liquid crystal display panel 10, and the second backlight assembly 25 includes a backlight source. In this embodiment, the display device includes a first working state and a second working state. In the first working state, the first backlight assembly 21 is in a working state, and the second backlight assembly 25 is in a non-working state. The backlight assembly has a first beam angle, so that the light emission angle range of the display device is small, so that the display device can be applied to application scenarios with narrow viewing angles, such as privacy display application scenarios; in the second working state, the first backlight assembly 21 is in a non-working state, and the second backlight assembly 25 is in a working state. The backlight assembly has a fourth beam angle, and the fourth beam angle is greater than the first beam angle, so that the light emission angle range of the display device is large, so that the display device can be applied to application scenarios with wide viewing angles, such as shared display application scenarios.

[0054] Specifically, in one embodiment of the present application, Fig. 9 As shown, the backlight source can be an edge-entry backlight source, such as including a light guide plate 251 located on the side of the first backlight component 21 away from the liquid crystal display panel 10 and a second light source 252 located on the side of the light guide plate 251; in another embodiment of the present application, the backlight source can also be a direct-type backlight source, such as including a plurality of lamp beads arranged in an array located on the side of the first backlight component away from the liquid crystal display panel. The present application does not limit this. In other embodiments of the present application, the backlight source can also be other backlight sources that can emit wide-viewing angle light, depending on the specific circumstances.

[0055] Optionally, in one embodiment of the present application, the first backlight assembly and the liquid crystal display panel are assembled by bonding glue, the thickness of the bonding glue between the first backlight assembly and the liquid crystal display panel is about 0.05 mm, and the thickness of the first light-guiding film in the first backlight assembly is about 0.05 mm. The thickness of the display device provided by this embodiment is only increased by 0.1 mm compared with the thickness of a conventional liquid crystal display device, which is basically equivalent to the thickness of a conventional liquid crystal display device. Therefore, the display device provided by the embodiment of the present application can realize the lightweight display device on the basis of realizing shared display and privacy display, thereby improving the competitiveness of the product.

[0056] In another embodiment of the present application, Fig.10As shown, the backlight assembly 20 further includes a second backlight assembly 26 located on the side of the first backlight assembly 21 away from the liquid crystal display panel 10, the second backlight assembly 26 includes at least one second light-guiding light-guiding film assembly, and the outgoing light of the second backlight assembly 26 has a fifth beam angle, which is different from the first beam angle. In this embodiment, the display device includes a first working state and a second working state, in which the first backlight assembly is in a working state, the second backlight assembly is in a non-working state, and the backlight assembly has a first beam angle; in the second working state, the first backlight assembly is in a non-working state, the second backlight assembly is in a working state, and the backlight assembly has a fifth beam angle, which is different from the first beam angle, so that the display device can be applied to different application scenarios.

[0057] Optionally, in one embodiment of the present application, the fifth beam angle may be greater than the first beam angle. In this embodiment, the display device includes a first working state and a second working state. In the first working state, the first backlight assembly is in a working state, and the second backlight assembly is in a non-working state. The backlight assembly has a first beam angle so that the light emission angle range of the display device is smaller, so that the display device can be applied to application scenarios with narrow viewing angles, such as privacy display application scenarios; in the second working state, the first backlight assembly is in a non-working state, and the second backlight assembly is in a working state. The backlight assembly has a fifth beam angle so that the light emission angle range of the display device is larger, so that the display device can be applied to application scenarios with wide viewing angles, such as shared display application scenarios.

[0058] In another embodiment of the present application, the fifth beam angle may be smaller than the first beam angle. In this embodiment, the display device includes a first working state and a second working state. In the first working state, the first backlight assembly is in a working state, and the second backlight assembly is in a non-working state. The backlight assembly has a first beam angle so that the light emission angle range of the display device is larger, so that the display device can be applied to application scenarios with wide viewing angles, such as shared display application scenarios; in the second working state, the first backlight assembly is in a non-working state, and the second backlight assembly is in a working state. The backlight assembly has a fifth beam angle so that the light emission angle range of the display device is smaller, so that the display device can be applied to application scenarios with narrow viewing angles, such as privacy display application scenarios.

[0059] The following takes the example that the fifth beam angle is greater than the first beam angle to continue describing the display device provided in the embodiment of the present application.

[0060] It should be noted that, in addition to the first working state and the second working state of the display device being applied in an application scenario with a narrow viewing angle, respectively, one being applied in an application scenario with a wide viewing angle, in other embodiments of the present application, the first working state and the second working state of the display device may both be application scenarios with a wide viewing angle. If the fifth beam angle is greater than the first beam angle, the first working state of the display device is applied to an application scenario with a first wide viewing angle, and the second working state of the display device is applied to an application scenario with a second wide viewing angle, and the second wide viewing angle is greater than the first wide viewing angle. The first working state and the second working state of the display device may both be application scenarios with a narrow viewing angle. If the fifth beam angle is greater than the first beam angle, the first working state of the display device is applied to an application scenario with a first narrow viewing angle, and the second working state of the display device is applied to an application scenario with a second narrow viewing angle, and the second narrow viewing angle is greater than the first narrow viewing angle. The present application does not limit this and it depends on the specific circumstances.

[0061] The following description of the display device provided in the embodiment of the present application continues by taking the case where the first working state of the display device is applied to a narrow viewing angle application scenario and the second working state of the display device is applied to a wide viewing angle application scenario as an example.

[0062] Specifically, Fig.11 As shown, in one embodiment of the present application, the second light-guide type light-guiding film assembly includes: a second light-guide type light-guiding film 41, a second light source 42 and a second coupling light-guide array 43, wherein the second light-guide type light-guiding film 41 is connected to the second light source 42 through the second coupling light-guide array 43, and the second light source 42 includes at least one LED. In specific operation, the light emitted by the second light source 42 is transmitted by total reflection in the second coupling light-guide array 43 until it is emitted from the second coupling light-guide array 43 and incident on the light extraction area of ​​the second light-guide type light-guiding film 41, and is hindered from total reflection by the light characteristic extraction of the light extraction area in the second light-guide type light-guiding film 41, so that the light is reflected away from the second light-guide type light-guiding film 41, and can provide backlight for the liquid crystal display panel.

[0063] On the basis of the above embodiments, in one embodiment of the present application, the second light-guiding light-guiding film is composed of at least one layer of light-guiding film thin film stack. In specific applications, the light emission angle can be controlled by controlling the shape, angle and / or refractive index difference between different light-guiding film thin film layers of the light feature extract in the second light-guiding light-guiding film, thereby controlling the light emission angle of the second light-guiding light-guiding film assembly. Optionally, in one embodiment of the present application, the light emitted by the second backlight assembly is a wide-viewing angle light, so that the display device can be applied to a shared display scenario.

[0064] Specifically, in one embodiment of the present application, the second light-guiding light-guiding film is composed of at least two light-guiding film thin films stacked together, and the thickness of the second light-guiding light-guiding film ranges from 0.05 mm to 0.5 mm, but the present application does not limit this, depending on the specific circumstances.

[0065] Optionally, in one embodiment of the present application, when the second light-guiding light-guiding film is composed of at least two layers of light-guiding film stacked together, the second light-guiding light-guiding film may also include at least one diffusion film located in the at least two layers of light-guiding film, that is, by inserting at least one or more diffusion films into at least two layers of light-guiding film, the beam angle of the light emitted by the second backlight assembly is increased to achieve wide-viewing angle light emission, but the present application does not limit this and it depends on the specific circumstances.

[0066] It should be noted that, in the present embodiment, the light extraction area of ​​the second light-guiding light-guiding film assembly covers the display area of ​​the liquid crystal display panel, that is, the light extraction area of ​​the second light-guiding light-guiding film covers the display area of ​​the liquid crystal display panel, so that the second backlight assembly is working, and when the first backlight assembly is not working, there is backlight at each position of the display area of ​​the liquid crystal display panel. Optionally, in one embodiment of the present application, the light extraction area of ​​the second light-guiding light-guiding film assembly completely covers the display area of ​​the liquid crystal display panel, and the area of ​​the light extraction area of ​​the second light-guiding light-guiding film assembly is larger than the area of ​​the display area of ​​the liquid crystal display panel, so as to reduce the difficulty of aligning the light extraction area of ​​the second light-guiding light-guiding film assembly and the display area of ​​the liquid crystal display panel on the basis of ensuring that the light extraction area of ​​the second light-guiding light-guiding film assembly covers the display area of ​​the liquid crystal display panel. However, the present application does not limit this and it depends on the specific circumstances.

[0067] Optionally, in one embodiment of the present application, the second backlight assembly includes at least two second light-guide type light-guiding film assemblies, and the emission angles of different second light-guide type light-guiding film assemblies are not completely the same, so that the second backlight assembly can emit light with a variety of beam angles, thereby enabling the display device to be applied to scenes requiring different display viewing angles. However, the present application does not limit this, and it depends on the specific situation.

[0068] It should be noted that, in this embodiment, the first light source and the first coupling lightguide array in the first backlight assembly may be located on different sides from the second light source and the second coupling lightguide array in the second backlight assembly, such as Fig.10 As shown, it can also be located on the same side, such as Fig.12 As shown, this application does not limit this and the specific circumstances will depend on the circumstances.

[0069] Continue as Fig.10 and Fig.12 As shown, in one embodiment of the present application, the first light-guide type light-guide film of the first light-guide type light-guide film assembly in the first backlight assembly 21, the first coupling lightguide array and the first light source are all located below the liquid crystal display panel 10, but the present application does not limit this. In other embodiments of the present application, the first coupling lightguide array and the first light source may also be other positions in the display device, such as above, on the left or on the right side of the liquid crystal display panel, as long as the first light-guide type light-guide film is located below the liquid crystal display panel. Similarly, the second light-guide type light-guide film of the second light-guide type light-guide film assembly in the second backlight assembly 26, the second coupling lightguide array and the second light source are all located below the liquid crystal display panel 10, but the present application does not limit this. In other embodiments of the present application, the second coupling lightguide array and the second light source may also be other positions in the display device, such as above, on the left or on the right side of the liquid crystal display panel, as long as the second light-guide type light-guide film is located below the first light-guide type light-guide film.

[0070] Optionally, in one embodiment of the present application, the first backlight assembly includes at least two first light-guiding light-guiding film assemblies, and the second backlight assembly includes at least two second light-guiding light-guiding film assemblies, so that the display device can more finely control the angle of the emitted light of the backlight assembly on the basis of being able to emit light of multiple beam angles, but the present application does not limit this and it depends on the specific circumstances.

[0071] It should be noted that if the first backlight assembly includes at least two first light-guiding light-guiding film assemblies, when the first backlight assembly is in a working state, at the same time, only one first light-guiding light-guiding film assembly emits light; similarly, if the second backlight assembly includes at least two second light-guiding light-guiding film assemblies, when the first backlight assembly is in a working state, at the same time, only one second light-guiding light-guiding film assembly emits light.

[0072] On the basis of any of the above embodiments, in one embodiment of the present application, the display device further includes a third working state. In the third working state, the first backlight assembly is in a working state, and the second backlight assembly is also in a working state. Taking the first beam angle as an example, which is smaller than the fifth beam angle, in this embodiment, Fig.13 As shown, when the display device is working, the second backlight assembly can be used to provide a larger light range, so that the display viewing angle of the display device is larger, and at the same time, the first backlight assembly can be used to provide a smaller light range to improve the display brightness of the display device within a small display viewing angle range, but the present application does not limit this and it depends on the specific situation.

[0073] Specifically, in one embodiment of the present application, the operating current of the first backlight assembly is a first current, and the operating current of the second backlight assembly is a second current. The duty cycle of the first current is different from the duty cycle of the second current. By adjusting the duty cycle of the operating currents of the first backlight assembly and the second backlight assembly (the current of the first light source in the first backlight assembly and the current of the second light source in the second backlight assembly), the different output light angles and brightness of the display device can be adjusted. For example, the duty cycle of the second current is 100%, and the duty cycle of the first current is between 0% and 100%. The vertical brightness of the module can be further improved in the shared state, but the present application does not limit this, and it depends on the specific circumstances.

[0074] Optionally, in one embodiment of the present application, the liquid crystal display panel, the first backlight assembly, and the second backlight assembly are all assembled by bonding adhesive, and the total thickness of the display device includes: the total thickness of the liquid crystal display panel is about 0.5 mm, the thickness of the adhesive between the liquid crystal display panel and the first backlight assembly is about 0.05 mm, and the thickness of the first light-guiding film is about 0.05 mm. The maximum thickness of the display device can be about 0.7 mm. Therefore, the display device provided in the embodiment of the present application can realize the thinness of the display device on the basis of realizing the switching between shared display and private display, thereby improving the competitiveness of the product.

[0075] Based on any of the above embodiments, in one embodiment of the present application, Fig.14 As shown, the backlight assembly 20 also includes: a second reflecting element 27 located between the first backlight assembly 21 and the second backlight assembly 26, so as to reflect the light emitted from the first backlight assembly to the second backlight assembly to the light incident side of the liquid crystal display panel, thereby improving the display brightness of the liquid crystal display panel, that is, improving the display brightness of the display device.

[0076] Optionally, in one embodiment of the present application, the second reflective element 27 is a reflective polarizer. Specifically, in one embodiment of the present application, the reflective polarizer is a dual brightness enhancement film (DBEF). The present application does not limit this and it depends on the specific circumstances.

[0077] In another embodiment of the present application, Fig.15 As shown, the backlight assembly 20 also includes: a third reflective element 28 located on the side of the second backlight assembly 26 away from the first backlight assembly 21, so as to reflect at least part of the light emitted by the second backlight assembly toward the side away from the first backlight assembly back to the light incident side of the liquid crystal display panel, thereby improving the display brightness of the liquid crystal display panel, that is, improving the display brightness of the display device.

[0078] Optionally, in one embodiment of the present application, the third reflective element 28 is a reflective plate or a reflective polarizer. Specifically, in one embodiment of the present application, the reflective plate may be an enhanced specular reflector (ESR), and the reflective polarizer may be a dual brightness enhancement film (DBEF). The present application does not limit this, and it depends on the specific circumstances.

[0079] In another embodiment of the present application, Fig.16 As shown, the backlight assembly 20 further includes:

[0080] a second reflecting element 27 located between the first backlight assembly 21 and the second backlight assembly 26, wherein the second reflecting element 27 is a reflective polarizer, so as to reflect the light emitted from the first backlight assembly to the second backlight assembly to the light incident side of the liquid crystal display panel, thereby improving the display brightness of the liquid crystal display panel, that is, improving the display brightness of the display device;

[0081] A third reflective element 28 is located on the side of the second backlight component 26 away from the first backlight component 21. The third reflective element 28 is a reflective plate or a reflective polarizer, which reflects at least part of the light emitted by the second backlight component toward the side away from the first backlight component back to the light incident side of the liquid crystal display panel, thereby improving the display brightness of the liquid crystal display panel, that is, improving the display brightness of the display device.

[0082] In summary, the display device provided in the embodiment of the present application can use the first light-guiding film in the first backlight assembly to provide light with a narrow viewing angle when realizing privacy display, and has a simple structure, a small thickness, and a high yield, which is in line with the development of thin and light products. Moreover, the display device provided in the embodiment of the present application can use the first light-guiding film in the first backlight assembly to provide light with a narrow viewing angle when realizing privacy display, and has low power consumption, and does not introduce problems such as color deviation, and has high display quality.

[0083] In this specification, each embodiment is described in a progressive, parallel, or progressive and parallel manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0084] It should be noted that in the description of this application, it should be understood that the description of the drawings and embodiments is illustrative rather than restrictive. The same reference numerals throughout the embodiments of the specification identify the same structure. In addition, the drawings may exaggerate the thickness of some layers, films, panels, regions, etc. for ease of understanding and description.

[0085] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0086] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display device, It is characterized in that include: Liquid crystal display panel; A backlight assembly is located on the non-display side of the liquid crystal display panel and provides backlight for the liquid crystal display panel. The backlight assembly includes a first backlight assembly. The first backlight assembly includes at least one first light-guiding film assembly. The outgoing light of the first backlight assembly has a first beam angle.

2. The display device according to claim 1, It is characterized in that The first backlight assembly includes at least two first light-guide type light-guiding film assemblies, and light emission angles of different first light-guide type light-guiding film assemblies are not completely the same.

3. The display device according to claim 1, It is characterized in that The backlight assembly further comprises: a dimming component located between the liquid crystal display panel and the first backlight assembly, the dimming component including a first state and a second state, in the first state, the dimming component has a modulation effect on the light emitted by the first backlight assembly, modulating the light emitted by the first backlight assembly from a first beam angle to a second beam angle, and in the second state, the dimming component has no modulation effect on the light emitted by the first backlight assembly; Wherein, the second beam angle is greater than the first beam angle.

4. The display device according to claim 3, It is characterized in that The backlight assembly further comprises: A first reflective element is located at a side of the first backlight assembly away from the dimming assembly, and the first reflective element is a reflective plate or a reflective polarizing plate.

5. The display device according to claim 3, It is characterized in that The backlight assembly further comprises: The light absorbing layer is located on a side of the first backlight assembly away from the dimming assembly.

6. The display device according to claim 1, Its characteristics are, The backlight assembly further comprises a second backlight assembly located at a side of the first backlight assembly away from the liquid crystal display panel, wherein the second backlight assembly comprises a backlight source; The display device includes a first working state and a second working state. In the first working state, the first backlight assembly is in a working state, the second backlight assembly is in a non-working state, and the backlight assembly has a first beam angle; in the second working state, the first backlight assembly is in a non-working state, the second backlight assembly is in a working state, and the backlight assembly has a fourth beam angle, which is greater than the first beam angle.

7. The display device according to claim 6, It is characterized in that The backlight source is an edge-type backlight source or a direct-type backlight source.

8. The display device according to claim 1, It is characterized in that The backlight assembly further comprises a second backlight assembly located at a side of the first backlight assembly away from the liquid crystal display panel, the second backlight assembly comprises at least one second light guide type light guide film assembly, and the outgoing light of the second backlight assembly has a fifth beam angle, which is different from the first beam angle; The display device includes a first working state and a second working state. In the first working state, the first backlight assembly is in a working state, the second backlight assembly is in a non-working state, and the backlight assembly has a first beam angle; in the second working state, the first backlight assembly is in a non-working state, the second backlight assembly is in a working state, and the backlight assembly has a fifth beam angle.

9. The display device according to claim 8, It is characterized in that The second backlight assembly includes at least two second light-guide type light-guiding film assemblies, and light emission angles of different second light-guide type light-guiding film assemblies are not completely the same.

10. The display device according to claim 8, It is characterized in that The fifth beam angle is greater than the first beam angle.

11. The display device according to claim 8, It is characterized in that The display device further includes a third working state, in which the first backlight assembly is in a working state, and the second backlight assembly is also in a working state.

12. The display device according to claim 11, It is characterized in that The operating current of the first backlight assembly is a first current, the operating current of the second backlight assembly is a second current, and the duty cycle of the first current is different from the duty cycle of the second current.

13. The display device according to claim 8, It is characterized in that The backlight assembly further comprises: A second reflective element is located between the first backlight assembly and the second backlight assembly, and the second reflective element is a reflective polarizer.

14. The display device according to claim 8, It is characterized in that The backlight assembly further comprises: A third reflective element is located on a side of the second backlight assembly away from the first backlight assembly, and the third reflective element is a reflective plate or a reflective polarizing plate.

15. The display device according to claim 1, It is characterized in that The light emitted by the first backlight assembly is collimated light.

Images