Curved surface touch display device

Abstract

The utility model relates to a curved surface touch display device which comprises a display screen and a lens arranged on the front side of the display screen, the lens is formed by gathering a large number of optical fibers, the first end, close to the display screen, of each optical fiber forms the rear side face of the lens, and the second end, away from the display screen, of each optical fiber forms the front side face of the lens. The front side surface of the lens is a non-deployable curved surface; conductive wires are clamped between part of adjacent optical fibers, and the conductive wires form anisotropic conduction between the front side face and the rear side face of the lens. The capacitive touch screen is characterized in that the display screen is a touch display screen with a capacitive touch sensing layer, the capacitive touch sensing layer is a plastic film arranged on the display surface of the display screen, and the rear ends of the conductive wires are electrically coupled with the capacitive touch sensing layer. The curved surface touch display device can effectively reduce loss caused by the fact that light emitted by the display surface of the display screen enters non-corresponding adjacent optical fibers, so that a front display picture formed on the front side surface of the lens by the display screen is clearer.

Description

Technical Field

[0001] The utility model relates to the field of display technology, and in particular to a curved touch display device. Background Art

[0002] With the continuous development of display technology, touch display devices have been widely used in various electronic devices, such as smart phones, tablet computers, and car displays. Traditional touch display devices mostly use flat display technology, and their display screens and touch layers are both flat structures, which cannot meet users' pursuit of curved display effects. Curved display technology has gradually become a research hotspot in the field of display technology due to its unique visual effects and more ergonomic design. However, there are many technical difficulties in the implementation of existing curved touch display devices: (1) When the required curved surface is a non-expandable surface, it is impossible to use the existing flexible touch display screen to bend it to obtain the required curved surface; (2) In existing curved touch display devices, the implementation of the curved touch layer also faces challenges. How to ensure the accurate transmission and response of touch signals on the curved surface has become an urgent problem to be solved.

[0003] To address the aforementioned issues, a curved touch display device has been designed. The device comprises a display screen with touch functionality and a lens disposed in front of the display screen. The lens is formed by a large number of optical fibers, with the optical fibers near a first end of the display screen forming the rear side of the lens, and the optical fibers away from the display screen forming the front side of the lens. The front side of the lens is a non-developable curved surface. Furthermore, conductive wires are interposed between some adjacent optical fibers, creating anisotropic conductivity between the front and rear sides of the lens. Thus, this curved touch display device, by disposing a lens formed by a large number of optical fibers in front of the display screen, can transmit the rear display image presented by the display screen through the optical fibers, forming the front display image on the front side of the lens. Since the front side of the lens is a non-developable curved surface, the display screen can achieve a non-developable curved display effect. Furthermore, the conductive wires interposed in the lens enable touch signals to be transmitted to the front side of the lens, thereby enabling touch operation.

[0004] However, in existing display screens with touch functions, the touch screen is generally arranged in front of the display screen, and the existing touch screen generally has a certain thickness, so that there is a certain distance between the back side of the lens and the display surface of the display screen (such as the liquid crystal layer of the liquid crystal display, the light-emitting layer of the OLED and LED displays). The light emitted from the display surface diverges over the above distance and then enters the back side of the lens, so that each optical fiber in the lens can not only receive the light of the corresponding pixel, but also receive the light of the adjacent pixels, thereby forming a blurred image on the front side of the lens. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a curved touch display device that can effectively reduce the loss caused by light from the display surface entering non-corresponding adjacent optical fibers, thereby making the front display image formed by the display screen on the front side of the lens clearer. The technical solution adopted is as follows:

[0006] A curved touch display device includes a display screen and a lens disposed in front of the display screen, wherein the lens is formed by a large number of optical fibers, wherein the first ends of the optical fibers proximate the display screen constitute the rear side of the lens, and the second ends of the optical fibers distal from the display screen constitute the front side of the lens, and the front side of the lens is a non-developable curved surface; conductive wires are sandwiched between some adjacent optical fibers, and the conductive wires form anisotropic conductivity between the front side and the rear side of the lens; the device is characterized in that: the display screen is a touch display screen with a capacitive touch sensing layer, the capacitive touch sensing layer being a plastic film disposed on the display surface of the display screen, and the rear ends of the conductive wires are electrically coupled to the capacitive touch sensing layer.

[0007] The non-developable surfaces refer to those surfaces that cannot be accurately developed into planes through geometric construction methods, such as surfaces with convexities or concavities, spherical surfaces, and wavy surfaces.

[0008] Generally, the conductive wire is a metal wire, such as a thin wire of copper, silver, gold or the like.

[0009] In the above-mentioned curved touch display device, a lens formed by a large number of optical fibers is arranged on the front side of the display screen. Since the optical fibers in the lens have a light-guiding function, the rear display image presented by the display screen can be guided by each optical fiber to form a front display image on the front side of the lens. Moreover, since the front side of the lens is a non-developable curved surface, a non-developable curved surface display effect of the display screen can be achieved. The display screen is a touch screen with a capacitive touch sensing layer. The capacitive touch sensing layer is a plastic film arranged on the display surface of the display screen. The thickness of the capacitive touch sensing layer is relatively low, which can make the distance between the display surface of the display screen and the inner side of the lens smaller. The distance between the optical fibers is very short, thereby reducing the loss caused by the light emitted from the display surface of the display screen entering non-corresponding adjacent optical fibers, making the front display image formed by the display screen on the front side of the lens clearer; by sandwiching a conductive wire between some adjacent optical fibers, the rear end of the conductive wire is electrically coupled with the capacitive touch sensing layer (for example, capacitive coupling), thereby transmitting the touch signal of the user's finger on the front side of the lens to the capacitive touch sensing layer of the touch display screen, thereby realizing touch operation, which not only solves the technical problem of touch signal transmission in the curved touch display device, but also improves the sensitivity of the touch operation.

[0010] As a preferred solution of the present invention, the thickness of the plastic film is within 50 μm.

[0011] As a preferred embodiment of the present invention, the plastic film is a colorless polyimide film, on which transparent sensing electrodes for capacitive touch sensing are provided. The transparent sensing electrodes are formed by patterning an indium tin oxide thin film. This allows the plastic film to be made very thin.

[0012] As a preferred solution of the present invention, the plastic film is adhered to the display surface of the display screen via a transparent adhesive layer, and the thickness of the transparent adhesive layer does not exceed 10 μm.

[0013] Generally, the display screen is a light-emitting display screen, which can be a liquid crystal display screen, an OLED display screen, or an LED display screen (such as a Mini LED or Micro LED display screen). The display screen can be a segment-type or pattern-type display screen, or a dot-matrix display screen.

[0014] In a preferred embodiment of the present invention, the display screen is an OLED display screen, and the plastic film forms a sealing layer for the OLED display screen. The distance between the pixel light-emitting surface of the OLED display screen and its display surface can be made very thin (less than 50 μm), thereby eliminating the need for additional film layers to cover the OLED display screen surface. This ultimately allows the display screen to be very close to the inner side of the lens.

[0015] As another preferred embodiment of the present invention, the display screen is an LED display screen (such as a Mini LED or Micro LED display screen), and the plastic film constitutes a sealing layer of the LED display screen. In an LED display screen, the pixel light-emitting surface directly serves as the display surface of the display screen, thereby eliminating the need for additional film layers to cover the surface of the LED display screen. This ultimately allows the display surface of the display screen to be very close to the inner side of the lens.

[0016] As a preferred embodiment of the present invention, the optical fiber and the display screen are perpendicular to each other. As a result, after the light is guided by the lens, the rear display formed by the display screen is a vertical projection of the front display screen, making the corresponding relationship clearer and easier to form a reflection of the front display screen through the rear display screen.

[0017] As a preferred embodiment of the present invention, the optical fibers are densely arranged. This dense arrangement means that adjacent optical fibers are in contact with each other with minimal gaps between them, such as when the cross-sections of the optical fibers are closely arranged in a hexagonal pattern. This ensures uniform light distribution throughout the lens and provides enhanced light guidance.

[0018] As a further preferred embodiment of the present invention, an adhesive is provided between adjacent optical fibers. Specifically, the adhesive can be epoxy resin. The adhesive enables the adjacent optical fibers to bond together to form a lens. The direction in which the optical fibers extend is defined as the light guiding direction. When manufacturing the lens, a large number of optical fibers in the same light guiding direction can be gathered and bonded together, then sliced ​​into the lens shape, and finally the front side of the lens is carved into a non-developable curved surface.

[0019] As a further preferred embodiment of the present invention, the adhesive is a black or dark-colored adhesive. The black or dark-colored adhesive can be an epoxy resin to which a black or dark pigment, particularly carbon powder or dye, has been added. This adhesive can absorb stray light other than that guided by the optical fiber, thereby improving the image quality of the display screen.

[0020] As a preferred solution of the present invention, the optical fiber is a circular optical fiber; part of the optical fiber is replaced by the conductive wires, and the conductive wires are not adjacent to each other.

[0021] As a further preferred solution of the present invention, the diameter of the optical fiber does not exceed 0.5 mm.

[0022] As a further preferred solution of the present invention, the diameter of the optical fiber does not exceed 0.2 mm.

[0023] As another preferred embodiment of the present invention, the optical fibers are circular; gaps are formed between adjacent optical fibers, and the conductive wires are sandwiched in the corresponding gaps. Thus, the conductive wires do not occupy the space where the optical fibers would be located in the lens, thereby ensuring uniform light guidance throughout the lens.

[0024] As a further preferred solution of the present invention, the diameter of the optical fiber does not exceed 0.5 mm.

[0025] As a further preferred solution of the present invention, the diameter of the optical fiber does not exceed 0.2 mm.

[0026] As a further preferred embodiment of the present invention, the outer diameter of the conductive wire does not exceed 100 μm, thereby minimizing the space occupied by the conductive wire in the optical fiber in the lens and ensuring uniform light guidance throughout the lens.

[0027] As a further preferred embodiment of the present invention, the conductive threads are carbon filaments. Specifically, the carbon filaments can be the same carbon filaments used to make carbon fibers. These filaments are not only fine (less than 15 μm) but also black. Doping the carbon filaments between the optical fibers can provide anisotropic conductivity between the front and back sides of the lens, while being imperceptible to the naked eye and not affecting the appearance or optical function of the lens.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The display screen in this curved touch display device is a touch screen with a capacitive touch sensing layer. The capacitive touch sensing layer is a plastic film provided on the display surface of the display screen. Its low thickness allows the display surface of the display screen to be very close to the inner side of the lens, thereby reducing the loss caused by light from the display surface of the display screen entering non-corresponding adjacent optical fibers, making the front display image formed by the display screen on the front side of the lens clearer. By sandwiching a conductive wire between some adjacent optical fibers, the rear end of the conductive wire forms an electrical coupling (for example, capacitive coupling) with the capacitive touch sensing layer, thereby transmitting the touch signal of the user's finger on the front side of the lens to the capacitive touch sensing layer of the touch screen, thereby realizing touch operation. This not only solves the technical problem of touch signal transmission in the curved touch display device, but also improves the sensitivity of the touch operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural diagram of a curved touch display device according to a first embodiment of a preferred embodiment of the present invention.

[0031] Figure 2 yes Figure 1 A cross-sectional view of the curved touch display device is shown.

[0032] Figure 3 This is a schematic structural diagram of the lens in Example 1 of the preferred embodiment of the present invention.

[0033] Figure 4 yes Figure 3 Cross-sectional view of the lens shown.

[0034] Figure 5 This is a cross-sectional view of the lens in Example 2 of the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0035] Example 1: Figures 1-4 As shown, this curved touch display device includes a display screen 1 and a lens 2 arranged on the front side of the display screen 1. The lens 2 is formed by a large number of optical fibers 21. The first end of each optical fiber 21 close to the display screen 1 constitutes the rear side of the lens 2, and the second end of each optical fiber 21 away from the display screen 1 constitutes the front side of the lens 2. The front side of the lens 2 is a non-developable curved surface 201; conductive wires 23 are sandwiched between some adjacent optical fibers 21, and the conductive wires 23 constitute anisotropic conductivity between the front side and the rear side of the lens 2; the display screen 1 is a touch display screen with a capacitive touch sensing layer, and the capacitive touch sensing layer is a plastic film 11 arranged on the display surface 101 of the display screen 1, and the thickness of the plastic film 11 is within 50μm; the rear end of the conductive wire 23 forms an electrical coupling (for example, capacitive coupling) with the capacitive touch sensing layer.

[0036] In this embodiment, the display screen 1 is an LED display screen (such as a Mini LED or Micro LED display screen), and the plastic film 11 forms a sealing layer for the LED display screen. In an LED display screen, the light-emitting surface of the pixels directly serves as the display surface, eliminating the need for additional film layers to cover the surface of the LED display screen. This ultimately minimizes the distance between the display screen and the inner side of the lens.

[0037] In this embodiment, the plastic film 11 is a colorless polyimide film. Transparent sensing electrodes 12 for capacitive touch sensing are provided on the plastic film 11. Transparent sensing electrodes 12 are patterned from an indium tin oxide thin film. The plastic film 11 is adhered to the display surface 101 of the display screen 1 via a transparent adhesive layer 13. The thickness of the transparent adhesive layer 13 does not exceed 10 μm. This allows the display screen 1 to be very thin overall.

[0038] In this embodiment, the optical fiber 21 is perpendicular to the display surface 101 of the display screen 1. As a result, after light is guided by the lens 2, the rear display formed by the display screen 1 is a vertical projection of the front display. This makes the correspondence clearer and makes it easier to map the front display through the rear display.

[0039] In this embodiment, the optical fibers 21 are densely arranged, circular in shape, and have a diameter of 0.1 mm. Adhesive 22 is provided between adjacent optical fibers 21. The adhesive 22 is black or dark-colored. Specifically, the adhesive 22 is an epoxy resin with added carbon powder or dye. This ensures uniform light transmission throughout the lens 2 and provides strong light transmission. The adhesive 22 bonds adjacent optical fibers 21 to form the lens 2 and absorbs stray light other than that guided by the optical fibers 21, improving the image quality of the display screen 1. The direction in which the optical fibers extend is defined as the light transmission direction. When manufacturing the lens 2, a large number of optical fibers 21 in the same light transmission direction can be gathered and bonded together using adhesive 22. The optical fibers 21 are then sliced ​​into the shape of the lens 2. Finally, the front side of the lens 2 is carved to form a non-developable curved surface 201.

[0040] In this embodiment, some optical fibers 21 are replaced by conductive wires 23 , and the conductive wires 23 are not adjacent to each other.

[0041] Example 2: Reference Figure 5While all other aspects are identical to those of Example 1, the difference is that in this embodiment, gaps 210 are formed between adjacent optical fibers 21, and conductive wires 23 are sandwiched within these gaps 210. These conductive wires 23 are carbon filaments. Specifically, the carbon filaments are the same as those used to make carbon fibers. These filaments are not only fine (less than 15 μm) but also black. Doping the carbon filaments between the optical fibers 21 creates anisotropic conductivity between the front and rear sides of the lens 2. This is also imperceptible to the naked eye, does not affect the appearance and optical function of the lens 2, and ensures uniform light guidance throughout the lens 2.

[0042] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different. Any equivalent or simple changes based on the structure, features, and principles of the present utility model patent are included in the scope of protection of the present utility model patent. Those skilled in the art of the present utility model can make various modifications, supplements, or replace the described specific embodiments with similar methods. As long as they do not deviate from the structure of the present utility model or exceed the scope defined by the claims, they shall fall within the scope of protection of the present utility model.

Claims

1. A curved touch display device comprising a display screen and a lens disposed in front of the display screen. The lens is formed by a large number of optical fibers, with the first ends of the optical fibers proximal to the display screen forming the rear side of the lens, and the second ends of the optical fibers distal to the display screen forming the front side of the lens. The front side of the lens is a non-developable curved surface. Conductive wires are sandwiched between some adjacent optical fibers, forming anisotropic conductivity between the front and rear sides of the lens. The device is characterized by: The display screen is a touch screen with a capacitive touch sensing layer. The capacitive touch sensing layer is a plastic film arranged on the display surface of the display screen. The rear end of the conductive line is electrically coupled with the capacitive touch sensing layer.

2. The curved touch display device according to claim 1, wherein: The thickness of the plastic film is within 50 μm.

3. The curved touch display device according to claim 1, wherein: The plastic film is a colorless polyimide film. A transparent sensing electrode for realizing capacitive touch sensing is provided on the colorless polyimide film. The transparent sensing electrode is formed by patterning an indium tin oxide thin film.

4. The curved touch display device according to claim 1, wherein: The plastic film is adhered to the display surface of the display screen via a transparent adhesive layer, and the thickness of the transparent adhesive layer does not exceed 10 μm.

5. The curved touch display device according to any one of claims 1 to 4, characterized in that: The display screen is an OLED display screen, and the plastic film constitutes a sealing layer of the OLED display screen.

6. The curved touch display device according to any one of claims 1 to 4, characterized in that: The display screen is an LED display screen, and the plastic film constitutes a sealing layer of the LED display screen.

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