Cover plate with double-bridge type structure

Abstract

The utility model discloses a double-bridge type structure cover plate which comprises curved glass, the curved glass comprises a front face and a back face which are oppositely arranged, the front face is a curved face, and the back face is a plane. In the first direction, the thickness of the curved glass is gradually reduced from the middle to the two sides, and in the second direction, the thickness of the curved glass is gradually reduced from the middle to the two sides. The whole front surface of the double-bridge type structure cover plate is a curved surface, the display effect of a screen can be improved, the back surface is a plane, and the problem of uneven film thickness can be prevented.

Description

Technical Field

[0001] The utility model relates to the field of electronic accessories, in particular to a double-bridge structure cover plate. Background Art

[0002] Curved glass is increasingly used as a protective cover for the screen on existing mobile phones and other display devices. At present, curved glass is divided into two options: 2.5D glass and 3D glass. 2.5D glass is based on glass grinding technology. A larger curved surface is ground on the side of the glass. It can be understood as a larger rounding of the side of the glass. Its advantages are high yield and low cost, but the front of its display area is still flat, and there is no improvement in the display effect of the screen. It is not a truly curved glass. 3D glass is based on glass hot bending technology. Flat glass is heated and bent in a hot bending mold into curved glass. Its advantage is that the entire glass is curved, which can greatly improve the display effect of the screen, but its yield is low and the cost is high, especially the back of the glass is curved, which is prone to uneven film thickness when screen printing ink and coating optical film. Utility Model Content

[0003] In order to solve the above-mentioned deficiencies of the prior art, the utility model provides a double-bridge structure cover plate, the front side of which is an overall curved surface, which can improve the display effect of the screen, and the back side of which is a flat surface, which can prevent the problem of uneven film thickness.

[0004] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0005] A double-bridge structure cover plate includes curved glass, wherein the curved glass includes a front side and a back side that are arranged opposite to each other, the front side is a curved surface, and the back side is a flat surface; along a first direction, the thickness of the curved glass gradually decreases from the middle to both sides, and along a second direction, the thickness of the curved glass gradually decreases from the middle to both sides.

[0006] Furthermore, the first direction is perpendicular to the second direction.

[0007] Furthermore, the curved glass also includes a side surface, and the side surface is connected between the front surface and the back surface.

[0008] Furthermore, the side surface includes two long side surfaces that are arranged opposite to each other and two short side surfaces that are arranged opposite to each other, the long side surfaces are parallel to the first direction, and the short side surfaces are parallel to the second direction.

[0009] Furthermore, the connections between adjacent long side surfaces and short side surfaces are all rounded structures.

[0010] Furthermore, the connection between the side surface and the front surface is a rounded structure.

[0011] Furthermore, the curved glass includes a display area and a frame area, and the frame area surrounds the display area; the double-bridge structure cover plate also includes frame ink, and the frame ink is arranged on the back side of the frame area of ​​the curved glass.

[0012] Furthermore, the curved glass is ultraviolet photochromic glass.

[0013] Furthermore, the double-bridge structure cover plate also includes an anti-reflection film, and the anti-reflection film is arranged on the back side of the curved glass.

[0014] Furthermore, the anti-reflection film includes a plurality of low-refractive-index films and a plurality of high-refractive-index films that are alternately stacked.

[0015] The utility model has the following beneficial effects: the double-bridge structure cover plate of the utility model makes the curved glass into a double-bridge structure, and the back of the curved glass is a plane. When silk-screening ink and coating an optical film on the back, there will be no problem of uneven film thickness. The front of the curved glass gradually bends downward from the middle to both sides along the first direction and the second direction, realizing an overall curved surface, which can greatly improve the display effect of the screen, and at the same time has the advantages of both 2.5D glass and 3D glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a three-dimensional structural schematic diagram of a double-bridge structure cover plate provided by the present invention.

[0017] Figure 2 for Figure 1 AA cross-sectional schematic diagram of the double-bridge structure cover plate shown.

[0018] Figure 3 for Figure 1 The BB cross-sectional diagram of the double-bridge structure cover is shown.

[0019] Figure 4 A schematic diagram of the groove profile of the grinding wheel when grinding the curved glass in the double-bridge structure cover provided by the utility model.

[0020] Figure 5 A schematic diagram of the grinding path of the grinding wheel when grinding the curved glass in the double-bridge structure cover provided by the utility model.

[0021] Figure 6 The present invention is a cross-sectional schematic diagram of another double-bridge structure cover plate provided by the present invention.

[0022] Figure 7 for Figure 6 Schematic diagram of the stacking structure of the anti-reflection film in the double-bridge structure cover plate shown. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Embodiment 1

[0028] like Figure 1 As shown, a double-bridge structure cover includes a curved glass 10, wherein the curved glass 10 includes a front side 11 and a back side 12 arranged opposite to each other, wherein the front side 11 is a curved surface, and the back side 12 is a flat surface; along a first direction X, the thickness of the curved glass 10 gradually decreases from the middle to both sides, and along a second direction Y, the thickness of the curved glass 10 gradually decreases from the middle to both sides.

[0029] The double-bridge structure cover of the utility model adopts the curved glass 10 as the main body, and the back side 12 of the curved glass 10 is a plane. When the ink is screen-printed and the optical film is plated on the back side 12, there will be no problem of uneven film thickness. The front side 11 of the curved glass 10 is gradually bent downward from the middle to both sides along the first direction X and the second direction Y, presenting an overall curved surface, which can greatly improve the display effect of the screen and has the advantages of both 2.5D glass and 3D glass.

[0030] like Figure 2 and 3 As shown, the cross-sections of the curved glass 10 along the first direction X and the second direction Y are both similar to an arch bridge shape, and the curvature of the front surface 11 of the curved glass 10 along the first direction X is smaller than the curvature along the second direction Y.

[0031] Preferably, the first direction X is perpendicular to the second direction Y.

[0032] The curved glass 10 further includes a side surface 13 , and the side surface 13 is connected between the front surface 11 and the back surface 12 .

[0033] In this embodiment, the curved glass 10 is a rectangular cover plate, and the side surface 13 includes two long side surfaces 13a and two short side surfaces 13b arranged opposite to each other. Preferably, the first direction X and the second direction Y are respectively the long side direction and the short side direction of the curved glass 10, that is, the long side surface 13a is parallel to the first direction X, and the short side surface 13b is parallel to the second direction Y.

[0034] Preferably, the connection between the adjacent long side surfaces 13a and short side surfaces 13b is a rounded structure, and the connection between the side surface 13 and the front surface 11 is a rounded structure.

[0035] The curved glass 10 includes a display area 101 and a frame area 102 , and the frame area 102 surrounds the display area 101 .

[0036] In the double-bridge structure cover of the utility model, since the front side 11 of the curved glass 10 gradually bends downward from the middle to both sides along the first direction X and the second direction Y, presenting an overall curved surface, the front side 11 of the display area 101 is also a curved structure, which can greatly improve the display effect of the screen.

[0037] The double-bridge structure cover plate further includes a frame ink 20 , and the frame ink 20 is disposed on the back side 12 of the frame area 102 of the curved glass 10 .

[0038] In the double-bridge structure cover plate of the present invention, since the back side 12 of the curved glass 10 is a plane, when the frame ink 20 is screen-printed on the back side 12 of the curved glass 10 , the frame ink 20 will not have an uneven film thickness problem.

[0039] The frame ink 20 is preferably but not limited to black ink, which is directly formed on the back surface 12 of the curved glass 10 by a silk screen printing process to cover the frame area 102 of the curved glass 10, and the thickness thereof is between 1-80 μm.

[0040] The double-bridge structure cover plate of the utility model comprises the following steps when being manufactured:

[0041] Step 1: grinding the four corners of the flat glass using a CNC process to form four rounded corner structures between adjacent long side surfaces 13a and short side surfaces 13b, and grinding the connection between the front surface 11 and the side surface 13 of the flat glass to form a bevel structure (to reduce the resistance of the grinding wheel when grinding below);

[0042] Step 2: grinding the front surface 11 of the flat glass by a grinding wheel process to form the curved glass 10. Figure 4 As shown, a grinding groove is provided on the circumference of the grinding wheel, and the groove profile of the grinding groove is the same as the curved surface profile of the front surface 11 of the curved glass 10 along the second direction Y (short side direction), as shown in FIG. Figure 5 As shown, the grinding path of the grinding wheel is the same as the curved surface profile of the front surface 11 of the curved glass 10 along the first direction X (long side direction);

[0043] Step three: using a silk screen printing process to make the frame ink 20 on the back side 12 of the frame area 102 of the curved glass 10 .

[0044] Embodiment 2

[0045] As an optimization solution of the first embodiment, in order to improve the abnormal reflection of the ambient light caused by the uneven thickness of the curved glass 10, in this embodiment, the curved glass 10 is ultraviolet photochromic glass.

[0046] The ultraviolet color-changing watch cover of the utility model adopts the ultraviolet color-changing glass to make the curved glass 10. Since there is ultraviolet light in outdoor sunlight, the color of the ultraviolet color-changing glass will darken under the irradiation of ultraviolet light, the absorbance will increase and the transmittance will decrease, the amount of visible light passing through the curved glass 10 will decrease, thereby reducing the amount of visible light reflected, which can improve the display effect in outdoor strong light environment. Since there is no ultraviolet light in indoor lighting and screen light, the color of the ultraviolet color-changing glass will disappear, the absorbance will decrease and the transmittance will increase, the amount of visible light passing through the curved glass 10 will increase, and it will not affect the display effect in indoor weak light environment.

[0047] In this embodiment, the ultraviolet color-changing glass is silver halide glass. Silver halide glass is a special photosensitive glass material, which is characterized by containing silver halide (AgX, X represents halogen, such as fluorine, chlorine, bromine or iodine) as a photosensitizer. This glass can undergo a reversible photochromic reaction under the action of light, that is, it will darken under ultraviolet irradiation and restore transparency after the ultraviolet rays are removed. Silver halide particles have a photochromic effect in glass of specific systems, such as alkali-boron system, lead-boron system, aluminum-boron system, aluminum-phosphorus system and alkali-aluminum-boron-silicon system. This effect is based on the photochemical reaction of silver halide under ultraviolet irradiation, decomposing to form metallic silver and absorbing light to color the glass. After the ultraviolet rays are removed, the metallic silver and the halogen atoms recombine to form transparent silver halide crystals, and the glass fades.

[0048] Of course, the ultraviolet color-changing glass may also be glass doped with other photosensitive colorants and is not limited to silver halide glass.

[0049] Embodiment 3

[0050] As an optimization solution of the first or second embodiment, in order to improve the abnormal reflection of the ambient light caused by the uneven thickness of the curved glass 10, in this embodiment, as Figure 6 As shown, the double-bridge structure cover plate further includes an anti-reflection film 30 , and the anti-reflection film 30 is disposed on the back side of the curved glass 10 .

[0051] The double-bridge structure cover plate of the utility model reduces the reflectivity of the curved glass 10 to ambient light through the anti-reflection film 30, thereby alleviating the abnormal reflection problem of the curved glass 10 to ambient light caused by uneven thickness, so as to improve the visual effect of the curved glass 10.

[0052] In this embodiment, the anti-reflection film 30 covers both the display area and the frame area.

[0053] The anti-reflection film 30 includes a plurality of low-refractive-index films and a plurality of high-refractive-index films that are alternately stacked.

[0054] The anti-reflection film 30 is based on the interference phenomenon of light. It is formed by alternatingly stacking low-refractive index films and high-refractive index films in sequence. Since the adjacent low-refractive index films and high-refractive index films have a large refractive index difference, they can reflect ambient light. The optical path difference between adjacent reflected lights is related to the film thickness of the low-refractive index film and the high-refractive index film. Therefore, by matching the film thickness of the low-refractive index film and the high-refractive index film, the optical path difference between two adjacent reflected lights can be made to be exactly π, that is, the vibration directions are opposite, thereby canceling each other out and reducing reflected light.

[0055] In this embodiment, the high refractive index film is a silicon nitride film, and the low refractive index film is a silicon oxide film. The method for forming the silicon nitride film and the silicon oxide film can adopt magnetron sputtering, evaporation coating, ion plating and other methods. These methods are well known to those skilled in the art and will not be repeated here.

[0056] Preferably, Figure 7 As shown, from the direction of the curved glass 10 to the frame ink 20, the anti-reflection film 30 is composed of a first silicon oxide film 31, a first silicon nitride film 32, a second silicon oxide film 33, a second silicon nitride film 34, a third silicon oxide film 35, a third silicon nitride film 36, and a fourth silicon oxide film 37 which are alternately stacked in sequence.

[0057] Among them, the thicknesses of the first silicon oxide film 31, the first silicon nitride film 32, the second silicon oxide film 33, the second silicon nitride film 34, the third silicon oxide film 35, the third silicon nitride film 36, and the fourth silicon oxide film 37 are 60-100nm, 5-30nm, 10-80nm, 10-80nm, 5-30nm, 40-100nm, and 50-120nm, respectively.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the utility model rather than to limit them. Although the embodiments of the utility model are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the utility model can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A double bridge structure cover plate, comprising curved glass, characterized in that: The curved glass includes a front side and a back side that are arranged opposite to each other, the front side is a curved surface, and the back side is a flat surface; along a first direction, the thickness of the curved glass gradually decreases from the middle to both sides, and along a second direction, the thickness of the curved glass gradually decreases from the middle to both sides.

2. The double bridge structure cover plate according to claim 1, characterized in that: The first direction is perpendicular to the second direction.

3. The double bridge structure cover plate according to claim 1 or 2, characterized in that: The curved glass further includes a side surface connected between the front surface and the back surface.

4. The double bridge structure cover plate according to claim 3, characterized in that: The side surfaces include two long side surfaces that are opposite to each other and two short side surfaces that are opposite to each other. The long side surfaces are parallel to the first direction, and the short side surfaces are parallel to the second direction.

5. The double bridge structure cover plate according to claim 4, characterized in that: The connection points between the adjacent long side surfaces and short side surfaces are all rounded structures.

6. The double bridge structure cover plate according to claim 3, characterized in that: The connection between the side surface and the front surface is a rounded structure.

7. The double bridge structure cover plate according to claim 1, characterized in that: The curved glass includes a display area and a frame area, and the frame area surrounds the display area; the double-bridge structure cover plate also includes frame ink, and the frame ink is arranged on the back side of the frame area of ​​the curved glass.

8. The double bridge structure cover plate according to claim 1, characterized in that: The curved glass is ultraviolet color-changing glass.

9. The double bridge structure cover plate according to claim 1, characterized in that: The double-bridge structure cover plate further includes an anti-reflection film, and the anti-reflection film is arranged on the back side of the curved glass.

10. The double bridge structure cover plate according to claim 9, characterized in that: The anti-reflection film includes a plurality of low-refractive-index films and a plurality of high-refractive-index films which are alternately stacked.

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