Display device

Abstract

The application discloses a display device, comprising a privacy film, the privacy film comprises a first lens layer and a second lens layer, the first lens layer and the second lens layer are stacked, the refractive index of the first lens layer is different from the refractive index of the second lens layer, there is an interface between the first lens layer and the second lens layer, the interface is used for converting large viewing angle light into small viewing angle light, the transmittance of one of the first lens layer and the second lens layer is not less than 92%, and the transmittance of the other of the first lens layer and the second lens layer is not less than 95%. The application can improve the problem of low light efficiency of the display device with the privacy film in the conventional scheme.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically to a display device. Background Technology

[0002] To prevent others from peeping at the displayed information, a privacy screen protector is integrated into the display device to achieve its privacy function. Conventional privacy screen protectors have a venetian blind structure, which combines the reflection and absorption of light over a wide viewing angle to achieve privacy protection. However, display devices with a venetian blind structure have low light transmittance, resulting in low luminous efficiency. Therefore, conventional solutions struggle to achieve privacy protection while maintaining luminous efficiency. Utility Model Content

[0003] Embodiments of this application provide a display device to improve the problem of low light efficiency in conventional display devices with privacy films.

[0004] Embodiments of this application provide a display device including a privacy film. The privacy film includes a first lens layer and a second lens layer, which are stacked together. The refractive index of the first lens layer is different from that of the second lens layer. An interface is provided between the first lens layer and the second lens layer. The transmittance of one of the first lens layer and the second lens layer is not less than 92%, and the transmittance of the other of the first lens layer and the second lens layer is not less than 95%. The angle of light before passing through the interface is greater than the angle of light after passing through the interface.

[0005] Furthermore, the first lens layer is disposed on the upper surface of the second lens layer, the first lens layer has a plurality of grooves, the second lens layer has a plurality of protrusions, the protrusions fill the grooves to form the interface, and the refractive index of the second lens layer is greater than that of the first lens layer.

[0006] Furthermore, the first lens layer is disposed on the lower surface of the second lens layer, the first lens layer has a plurality of grooves, the second lens layer has a plurality of protrusions, the protrusions fill the grooves to form the interface, and the refractive index of the second lens layer is greater than that of the first lens layer.

[0007] Furthermore, the difference between the refractive index of the second lens layer and the refractive index of the first lens layer is 0.3 to 0.5.

[0008] Furthermore, the refractive index of the first lens layer is 1.3 to 1.4, and the refractive index of the second lens layer is 1.5 to 1.8.

[0009] Furthermore, from a perspective along the thickness direction of the display device, the cross-section of the interface is arc-shaped.

[0010] Furthermore, the display device also includes an organic light-emitting display panel, which includes a plurality of sub-pixels, wherein the privacy film is disposed on the light-emitting side of the organic light-emitting display panel; and in a top view of the display device, the protrusion overlaps with at least a portion of the sub-pixels.

[0011] Furthermore, the groove portion is a concave lens, the protrusion portion is a convex lens, the focal length of the concave lens is 4um~10um, and the focal length of the convex lens is 4um~10um.

[0012] Furthermore, the display device also includes a backlight module and a liquid crystal display panel, wherein the liquid crystal display panel is disposed on the light-emitting side of the backlight module, and the privacy film is located between the backlight module and the liquid crystal display panel.

[0013] Furthermore, the backlight module includes a back plate, a light guide disposed in a cavity of the back plate, and an optical film disposed on the side of the light guide away from the back plate. The privacy film is disposed on the surface of the optical film away from the light guide, and the refractive index of the second lens layer is greater than the refractive index of the optical film.

[0014] The beneficial effects of this application are: This application provides a display device in which the privacy film includes a first lens layer and a second lens layer, which are stacked together. The refractive index of the first lens layer is different from that of the second lens layer. An interface is provided between the first lens layer and the second lens layer. The transmittance of one of the first lens layer and the second lens layer is not less than 92%, and the transmittance of the other of the first lens layer and the second lens layer is not less than 95%. The angle of light before passing through the interface is greater than the angle of light after passing through the interface. This allows the wide-angle light from the display device to pass through the interface. The light from the viewing angle is transformed into light from the narrow viewing angle. Therefore, compared with the conventional display device that uses a louvered structure, the first lens layer and the second lens layer in this solution can reduce the light shining on the display device in the wide viewing angle direction. On the one hand, it achieves privacy protection for the display device, and on the other hand, it can reduce the light loss of the display device in the wide viewing angle direction. Furthermore, since the transmittance of one of the first lens layer and the second lens layer is not less than 92%, and the transmittance of the other of the first lens layer and the second lens layer is not less than 95%, it can also reduce the loss of wide viewing angle light when passing through the privacy film, thereby improving the light output efficiency of the display device. Attached Figure Description

[0015] Figure 1 Yes, it is a top view of the display device; Figure 2 This is a schematic diagram of a first structure of the privacy film for the display device of this application; Figure 3 yes Figure 2 A schematic diagram illustrating the privacy protection principle of the display device shown; Figure 4 This is a schematic diagram of a second structure of the privacy film of the display device of this application; Figure 5 yes Figure 4 A schematic diagram illustrating the privacy protection principle of the display device shown; Figure 6 This is a structural diagram of the privacy film of this application applied to an organic light-emitting display panel; Figure 7 yes Figure 6 A schematic diagram of the first positional relationship between the pixels of the organic light-emitting display panel and the convex lens portion of the display device shown; Figure 8 yes Figure 6 A schematic diagram showing a second positional relationship between the pixels of the organic light-emitting display panel and the convex lens portion of the display device shown; Figure 9 This is a structural diagram of the privacy film of this application applied to a liquid crystal display device; Figure 10 yes Figure 9 A schematic diagram of the backlight module of the liquid crystal display device shown; Figure 11 This is a schematic diagram of a privacy screen protector for a conventional display device.

[0016] Explanation of reference numerals in the attached figures: 10-Display device; 100-Privacy protection film; 110-First lens layer; 111-Groove portion; 120-Second lens layer; 121-Protrusion portion; 130-Interface; 200-Organic light-emitting display panel; 210-Sub-pixel; 300-Backlight module; 310-Back plate; 311-Receiving cavity; 320-Light guide; 330-Optical film; 400-Liquid crystal display panel.

[0017] 101-Privacy film. Detailed Implementation

[0018] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. The technical solutions described below are for illustrative purposes only and should not be construed as limiting the scope of protection of this application.

[0019] Furthermore, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different technical features. The terms "multiple" and similar words indicate two or more unless otherwise expressly specified.

[0020] The first embodiment of this application provides a first display device 10, see reference. Figure 1 , Figure 2 and Figure 3 The display device 10 includes a privacy film 100, which includes a first lens layer 110 and a second lens layer 120. At a viewing angle along the thickness direction H of the display device, the first lens layer 110 is disposed on the upper surface of the second lens layer 120. The first lens layer 110 has a plurality of recesses 111, and the second lens layer 120 has a plurality of protrusions 121. The protrusions 121 fill the recesses 111 to form the interface 130. The refractive index of the second lens layer 120 is greater than that of the first lens layer 110. The transmittance of one of the first lens layer 110 and the second lens layer 120 is not less than 92%, and the transmittance of the other of the first lens layer 110 and the second lens layer 120 is not less than 95%.

[0021] refer to Figure 11The privacy screen protector 101 of a conventional display device has a louvered structure. Its principle is to combine the reflection and absorption of light from a wide viewing angle, so that the display device can achieve the privacy function from a wide viewing angle. However, the light transmittance of the display device with the privacy screen protector 100 having a louvered structure is low, resulting in low light efficiency. Therefore, it is difficult for the conventional display device to achieve privacy while ensuring light efficiency. Therefore, the technical solution of this application provides a display device 10, which includes a first lens layer 110 and a second lens layer 120 by setting the privacy film 100. The first lens layer 110 is disposed on the upper surface of the second lens layer 120. The first lens layer 110 has a plurality of grooves 111, and the second lens layer 120 has a plurality of protrusions 121. The protrusions 121 fill the grooves 111 to form the interface 130. The refractive index of the second lens layer 120 is greater than that of the first lens layer 110. The transmittance of one of the first lens layer 110 and the second lens layer 120 is not less than 92%, and the transmittance of the other of the first lens layer 110 and the second lens layer 120 is not less than 95%, so that the wide-viewing-angle light of the display device 10 passes through the protrusions 121 and the second lens layer 120. When the outlet portion 121 and the recess portion 111 form an interface 130, the light from a wide viewing angle can be converted into light from a narrow viewing angle. Therefore, compared with the conventional display device that uses a louvered structure, the first lens layer 110 and the second lens layer 120 in this solution can reduce the light irradiated onto the display device 10 in the wide viewing angle direction. On the one hand, it achieves privacy protection for the display device, and on the other hand, it can reduce the light loss of the display device 10 in the wide viewing angle direction. Furthermore, since the transmittance of one of the first lens layer 110 and the second lens layer 120 is not less than 92%, and the transmittance of the other of the first lens layer 110 and the second lens layer 120 is not less than 95%, the loss of light from the wide viewing angle of the display device 10 when passing through the privacy film 100 can be reduced, thereby improving the light output efficiency of the display device.

[0022] It is understood that in this embodiment, the groove 111 is formed on the upper surface of the first lens layer 110, and the protrusion 121 is formed on the lower surface of the second lens layer 120, so that the protrusion 121 can fill the groove 111.

[0023] In this embodiment, the lower surface of the first lens layer 110 is a plane, and the upper surface of the second lens layer 120 is a plane.

[0024] In this embodiment, the transmittance of the first lens layer 110 is not less than 92%, and the transmittance of the second lens layer 120 is not less than 95%.

[0025] In this embodiment, the refractive index difference between the second lens layer 120 and the first lens layer 110 is 0.3 to 0.5. By setting the refractive index difference between the second lens layer 120 and the first lens layer 110 to 0.3 to 0.5, light can be deflected at a larger angle when passing through the interface 130, thereby achieving effective privacy protection for the display device. Preferably, the refractive index difference between the second lens layer 120 and the first lens layer 110 is 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, or 0.5.

[0026] It is understandable that the privacy protection effect of the display device is optimal when the difference between the refractive index of the second lens layer 120 and the refractive index of the first lens layer 110 is 0.5, that is, when the difference between the refractive index of the first lens layer 110 and the refractive index of the second lens layer 120 is the largest.

[0027] In this embodiment, the refractive index of the first lens layer 110 is 1.3~1.4, and the refractive index of the second lens layer 120 is 1.5~1.8. Preferably, the refractive index of the first lens layer 110 is 1.30, 1.31, 1.32, 1.33, 1.34, 1.35, 1.36, 1.37, 1.38, 1.39 or 1.4, and the refractive index of the second lens layer 120 is 1.51, 1.52, 1.53, 1.54, 1.55, 1.56, 1.57, 1.58, 1.59, 1.60, 1.61, 1.62, 1.63, 1.64, 1.65, 1.66, 1.67, 1.68, 1.69, 1.70, 1.71, 1.72, 1.73, 1.74, 1.75, 1.76, 1.77, 1.78, 1.79 or 1.80.

[0028] It is understandable that when the refractive index of the first lens layer 110 is 1.3 and the refractive index of the second lens layer 120 is 1.8, that is, when the difference between the refractive indices of the first lens layer 110 and the second lens layer 120 is the largest, the privacy protection effect of the display device is optimal.

[0029] In this embodiment, reference Figure 2 , Figure 3 From a perspective along the thickness direction H of the display device, the cross-section of the interface 130 is arc-shaped.

[0030] In this embodiment, reference Figure 6 , Figure 7 and Figure 8The display device further includes an organic light-emitting display panel 200, which includes a plurality of sub-pixels 210. The privacy film 100 is disposed on the light-emitting side of the organic light-emitting display panel 200. When viewed from above, the protrusion 121 overlaps with at least a portion of the sub-pixels 210.

[0031] In this embodiment, from a top-down view of the display device, the protrusion 121 overlaps with a portion of the sub-pixel 210.

[0032] In this embodiment, from a top-down view of the display device, the protrusion 121 overlaps with the sub-pixel 210.

[0033] In this embodiment, the groove portion 111 is a concave lens, and the protrusion portion 121 is a convex lens. The focal length of the concave lens is 4µm to 10µm, and the focal length of the convex lens is 4µm to 10µm. By setting the focal length of the concave lens to 4µm to 10µm and the focal length of the convex lens to 4µm to 10µm, the first lens layer 110 and the second lens layer 120 effectively change the path of large-angle light, thereby improving the light emission efficiency of the display device. Preferably, the focal length of the concave lens portion is 4µm, 4.2µm, 4.4µm, 4.6µm, 4.8µm, 5.0µm, 5.2µm, 5.4µm, 5.6µm, 5.8µm, 6.0µm, 6.2µm, 6.4µm, 6.6µm, 6.8µm, 7.0µm, 7.2µm, 7.4µm, 7.6µm, 7.8µm, 8.0µm, 8.2µm, 8.4µm, 8.6µm, 8.8µm, 9.0µm, 9.2µm, 9.4µm, 9.6µm, 9.8µm, or 10µm. The focal length of the convex lens portion is 4µm, 4.2µm, 4.4µm, 4.6µm, 4.8µm, 5.0µm, 5.2µm, 5.4µm, 5.6µm, 5.8µm, 6.0µm, 6.2µm, 6.4µm, 6.6µm, 6.8µm, 7.0µm, 7.2µm, 7.4µm, 7.6µm, 7.8µm, 8.0µm, 8.2µm, 8.4µm, 8.6µm, 8.8µm, 9.0µm, 9.2µm, 9.4µm, 9.6µm, 9.8µm, or 10µm.

[0034] In this embodiment, the radius of curvature of the concave lens portion is 2µm to 3µm, and the radius of curvature of the convex lens portion is 2µm to 3µm. Preferably, the radius of curvature of the concave lens portion is 2µm, 2.1µm, 2.2µm, 2.3µm, 2.4µm, 2.5µm, 2.6µm, 2.7µm, 2.8µm, 2.9µm, or 3.0µm, and the radius of curvature of the convex lens portion is 2µm, 2.1µm, 2.2µm, 2.3µm, 2.4µm, 2.5µm, 2.6µm, 2.7µm, 2.8µm, 2.9µm, or 3.0µm.

[0035] In this embodiment, reference Figure 9 The display device further includes a backlight module 300 and a liquid crystal display panel 400. The liquid crystal display panel 400 is disposed on the light-emitting side of the backlight module 300, wherein the privacy film 100 is located between the backlight module 300 and the liquid crystal display panel 400. By disposing the privacy film 100 between the backlight module 300 and the liquid crystal display panel 400, the privacy structure composed of the first lens layer 110 and the second lens layer 120 can converge the light emitted from the backlight module 300, reducing the diffusion of the light emitted from the backlight module 300 to the surroundings, thereby further improving the light emission efficiency of the display device.

[0036] In this embodiment, reference Figure 10 The backlight module 300 includes a back plate 310, a light guide 320 disposed in a receiving cavity 311 of the back plate 310, and an optical film 330 disposed on the side of the light guide 320 away from the bottom plate of the back plate 310. The privacy film 100 is disposed on the surface of the optical film 330 away from the light guide 320, and the refractive index of the second lens layer 120 is greater than the refractive index of the optical film 330. By setting the privacy film 100 on a surface of the optical film 330 away from the light guide 320, and the refractive index of the second lens layer 120 being greater than that of the optical film 330, when the wide-viewing-angle light generated by the backlight module 300 passes through the second lens layer 120, the light is transmitted from the optically less dense medium to the optically denser medium, so that the light can also be tilted towards the front viewing direction of the display device. On the one hand, this is more conducive to improving the privacy performance of the display device, and on the other hand, it is more conducive to reducing the light loss of the backlight module 300 in the wide-viewing-angle direction, thereby further improving the light output efficiency of the display device.

[0037] In this embodiment, the refractive index of the first lens layer 110 is less than the refractive index of the optical film 330.

[0038] In this embodiment, the material of the first lens layer 110 is tetrabutyl titanate-acrylic resin, and the material of the second lens layer 120 is acrylic resin. By setting the material of the first lens layer 110 to tetrabutyl titanate-acrylic resin and the material of the second lens layer 120 to acrylic resin, on the one hand, the light transmittance of the first lens layer 110 is greater than 92% and the light transmittance of the second lens layer 120 is greater than 95%, thereby reducing the amount of light loss after passing through the first lens layer 110. On the other hand, the refractive index of the first lens layer 110 is between 1.5 and 1.8, and the refractive index of the second lens layer 120 is between 1.3 and 1.4, so that the refractive indices of the first lens layer 110 and the second lens layer 120 are different, which helps to reduce the light irradiating the display device in the wide viewing angle direction. In addition, the first lens layer 110, which is made of tetrabutyl titanate-acrylic resin, has adhesive properties, so the first lens layer 110 can be used as an adhesive layer, eliminating the need for an additional adhesive layer for bonding the privacy film 100 and the backlight module 300, thus reducing the manufacturing cost of the display device.

[0039] The second embodiment of this application provides a second display device, see reference. Figure 1 , Figure 4 , Figure 5 The second embodiment is similar to the first embodiment, but differs from the first embodiment in that, from the perspective along the thickness direction H of the display device, the first lens layer 110 is disposed on the lower surface of the second lens layer 120, the first lens layer 110 has a plurality of grooves 111, the second lens layer 120 has a plurality of protrusions 121, the protrusions 121 fill the grooves 111 to form the interface 130, and the refractive index of the second lens layer 120 is greater than the refractive index of the first lens layer 110.

[0040] refer to Figure 1The privacy screen protector 101 of a conventional display device has a louvered structure. Its principle is to combine the reflection and absorption of light from a wide viewing angle, so that the display device can achieve the privacy function from a wide viewing angle. However, the light transmittance of the display device with the privacy screen protector 101 having a louvered structure is low, resulting in low light efficiency. Therefore, it is difficult for a conventional display device to achieve privacy while ensuring light efficiency. Therefore, the technical solution of this application provides a display device. By setting the privacy film 100, which includes a first lens layer 110 and a second lens layer 120, the first lens layer 110 is disposed on the lower surface of the second lens layer 120. The first lens layer 110 has multiple recesses 111, and the second lens layer 120 has multiple protrusions 121. The protrusions 121 fill the recesses 111 to form the interface 130. The refractive index of the second lens layer 120 is greater than that of the first lens layer 110. The transmittance of one of the first lens layer 110 and the second lens layer 120 is not less than 92%, and the transmittance of the other of the first lens layer 110 and the second lens layer 120 is not less than 95%, so that the wide-viewing-angle light of the display device is protected from light passing through the recesses 110 and the second lens layer 120. When the protrusion 121 and the groove 111 form an interface 130, light from a wide viewing angle can be converted into light from a narrow viewing angle. Therefore, compared with the conventional display device that uses a venetian blind structure, the first lens layer 110 and the second lens layer 120 in this solution can reduce the light illuminating the display device in the wide viewing angle direction. On the one hand, it achieves privacy protection for the display device, and on the other hand, it can reduce the light loss of the display device in the wide viewing angle direction. Furthermore, since the transmittance of one of the first lens layer 110 and the second lens layer 120 is not less than 92%, and the transmittance of the other of the first lens layer 110 and the second lens layer 120 is not less than 95%, the loss of light from the wide viewing angle of the display device when passing through the privacy film 100 can be reduced, thereby improving the light output efficiency of the display device.

[0041] It is understood that in this embodiment, the groove 111 is formed on the lower surface of the first lens layer 110, and the protrusion 121 is formed on the upper surface of the second lens layer 120, so that the protrusion 121 can fill the groove 111.

[0042] In this embodiment, the upper surface of the first lens layer 110 is a plane, and the lower surface of the second lens layer 120 is a plane.

[0043] It should be understood that, unless otherwise specified or there is a logical conflict, the terminology and / or descriptions between different embodiments are consistent and can be referenced by each other, and the technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0044] The specific embodiments of this application have been described in detail above. The embodiments disclosed above are merely preferred embodiments of this application. Those skilled in the art can make many modifications and improvements without departing from the concept of this application. All such modifications and improvements fall within the scope of protection defined by the claims of this application.

Claims

1. A display device, characterized in that, The device includes a privacy screen protector, comprising a first lens layer and a second lens layer, which are stacked together. The refractive index of the first lens layer is different from that of the second lens layer. An interface is provided between the first lens layer and the second lens layer. The transmittance of one of the first lens layer and the second lens layer is not less than 92%, and the transmittance of the other of the first lens layer and the second lens layer is not less than 95%. The angle of light before passing through the interface is greater than the angle of light after passing through the interface.

2. The display device according to claim 1, characterized in that, The first lens layer is disposed on the upper surface of the second lens layer. The first lens layer has a plurality of grooves, and the second lens layer has a plurality of protrusions. The protrusions fill the grooves to form the interface. The refractive index of the second lens layer is greater than that of the first lens layer.

3. The display device according to claim 1, characterized in that, The first lens layer is disposed on the lower surface of the second lens layer. The first lens layer has a plurality of grooves, and the second lens layer has a plurality of protrusions. The protrusions fill the grooves to form the interface. The refractive index of the second lens layer is greater than that of the first lens layer.

4. The display device according to claim 2 or 3, characterized in that, The difference between the refractive index of the second lens layer and the refractive index of the first lens layer is 0.3 to 0.

5.

5. The display device according to claim 4, characterized in that, The refractive index of the first lens layer is 1.3 to 1.4, and the refractive index of the second lens layer is 1.5 to 1.

8.

6. The display device according to claim 2 or 3, characterized in that, From a perspective along the thickness direction of the display device, the cross-section of the interface is arc-shaped.

7. The display device according to claim 2 or 3, characterized in that, The display device further includes an organic light-emitting display panel, which includes a plurality of sub-pixels, wherein the privacy film is disposed on the light-emitting side of the organic light-emitting display panel; and in a top view of the display device, the protrusion overlaps with at least a portion of the sub-pixels.

8. The display device according to claim 7, characterized in that, The groove portion is a concave lens, the protrusion portion is a convex lens, the focal length of the concave lens is 4um~10um, and the focal length of the convex lens is 4um~10um.

9. The display device according to claim 2 or 3, characterized in that, The display device further includes a backlight module and a liquid crystal display panel, wherein the liquid crystal display panel is disposed on the light-emitting side of the backlight module, and the privacy film is located between the backlight module and the liquid crystal display panel.

10. The display device according to claim 9, characterized in that, The backlight module includes a back plate, a light guide disposed in a cavity of the back plate, and an optical film disposed on the side of the light guide away from the back plate. The privacy film is disposed on the surface of the optical film away from the light guide, and the refractive index of the second lens layer is greater than the refractive index of the optical film.

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