Frameless display device and manufacturing method thereof

Abstract

The invention provides a frameless display device, a display panel is provided with a first side wall, and a direction perpendicular to the first side wall is defined as a first direction; the first polaroid is provided with a body part and an extension part which are connected with each other, the body part is overlapped on the light emitting surface of the display panel, and the extension part extends out from the body part along a first direction; the bonding part covers the first side wall of the display panel and the bottom surface of the extension part, the bonding part forms a first bonding surface on the bottom surface of the extension part, and the bonding part forms a second bonding surface on the first side wall; the first bonding surface has a first size in a first direction, the bonding part further comprises a first connecting surface and a second connecting surface, the first connecting surface and the second connecting surface are connected to form a first connecting top, a top size is formed between the first connecting top and the first side wall in the first direction, and the first size is not greater than the top size; the first size is not greater than 250 [mu] m. The problem of whitening of the visual edge of the display device can be avoided.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a borderless display device that avoids edge whitening and its manufacturing method. Background Technology

[0002] With technological advancements, users have increasingly higher requirements for the bezel size of display devices, leading to the emergence of ultra-narrow bezel displays and bezel-less displays. In the manufacturing process of bezel-less displays, after the polarizer is attached to the display panel, adhesive is applied to the sidewalls and then laser-cut after the adhesive has cured. This process corrects the edge shape and size of the polarizer and cured adhesive to facilitate subsequent processes. If the maximum horizontal thickness of the side adhesive is too large after cutting, the edge of the upper polarizer may be subjected to external forces (such as robotic gripping or clamp collisions) during subsequent module assembly, transportation, or use. These forces can concentrate at the edge of the polarizer, causing micro-deformation or slight separation from the substrate, or causing some of the exposed adhesive to detach, resulting in light leakage. Visually, this manifests as localized whitening at the edges, severely affecting display uniformity and product yield. Summary of the Invention

[0003] In view of the problems in the prior art, the object of the present invention is to provide a frameless display device and a method for manufacturing the same. By precisely designing and controlling the dimensional parameters of the adhesive part (side adhesive layer) at key positions, the side profile structure is optimized, the stress acting on the edge of the first polarizer is dispersed and reduced, the visual whitening of the edge of the first polarizer is fundamentally prevented, and the ability of the adhesive part (side adhesive layer) to resist external force detachment is enhanced.

[0004] According to one aspect of the present invention, a borderless display device is provided, the borderless display device comprising:

[0005] A display panel having a first sidewall, wherein a direction perpendicular to the first sidewall is defined as a first direction;

[0006] A first polarizer has a body portion and an extension portion connected together. The body portion is stacked on the light-emitting surface of the display panel, and the extension portion extends from the body portion along the first direction.

[0007] An adhesive portion covers the first sidewall of the display panel and the bottom surface of the extension portion. The adhesive portion forms a first adhesive surface on the bottom surface of the extension portion and a second adhesive surface on the first sidewall.

[0008] The first adhesive surface has a first dimension in the first direction, and the adhesive part also has a first connecting surface and a second connecting surface. The first adhesive surface, the first connecting surface, the second connecting surface and the second adhesive surface are connected in sequence, and the first connecting surface and the second connecting surface intersect to form a first intersection top. The first intersection top and the first sidewall have a top dimension in the first direction. The first dimension is not greater than the top dimension and the first dimension is not greater than 250um.

[0009] As an optional technical solution, the vertical projection of the top of the first junction on the first sidewall is located on the second substrate.

[0010] As an optional technical solution, the first adhesive surface intersects with the first connecting surface to form a second junction top, and the first connecting surface has a second dimension from the second junction top to the first junction top, the second dimension being at least twice the first dimension.

[0011] As an optional technical solution, the adhesive portion has a first thickness in the thickness direction of the display panel, the first thickness being greater than the second dimension; or, the first thickness being between 2 and 4 times the first dimension.

[0012] As an optional technical solution, the first dimension is between 200um and 250um; the ratio of the first dimension to the top dimension is between 0.67 and 1; and the second dimension is not less than 500um.

[0013] As an optional technical solution, the first connecting surface is an inclined plane, and the second connecting surface is a curved surface.

[0014] As an optional technical solution, the display panel includes a color filter substrate and an array substrate disposed opposite to each other, the first polarizer is located on the array substrate, the display device also includes a backlight module, the display panel is supported on the backlight module, and the light provided by the backlight module enters the color filter substrate and the array substrate in sequence and is emitted from the first polarizer.

[0015] As an optional technical solution, the display device further includes a second polarizer disposed on the color filter substrate, and the second polarizer does not extend beyond the color filter substrate in the first direction.

[0016] According to another aspect of the present invention, the present invention also provides a method for manufacturing a borderless display device, comprising:

[0017] A display panel is fabricated, the display panel having a first sidewall;

[0018] A first polarizer is provided, the first polarizer having a connected body portion and an extension portion, the body portion being stacked on the light-emitting surface of the display panel, and the extension portion extending out from the body portion along a first direction; and

[0019] An adhesive is provided to cover the first sidewall of the display panel and the bottom surface of the extension to form an adhesive portion, wherein the adhesive portion forms a first adhesive surface on the bottom surface of the extension;

[0020] The first adhesive surface has a first dimension in the first direction, and the adhesive part also has a first connecting surface and a second connecting surface. The first connecting surface is connected between the first adhesive surface and the second connecting surface. The first connecting surface and the second connecting surface intersect to form a first intersection top. The first intersection top and the first sidewall have a top dimension in the first direction. The first dimension is not greater than the top dimension and is not greater than 250um.

[0021] As an optional technical solution, after the adhesive is cured, the first polarizer is obliquely cut in the first direction, extending beyond the first sidewall, along with a portion of the partially cured adhesive, to form the extension and the adhesive portion.

[0022] In summary, in the display device of the present invention, the first dimension of the adhesive portion between the first sidewall of the display panel and the bottom surface of the extension of the first polarizer is controlled to be no greater than the top dimension and no greater than 250µm, thereby increasing the second dimension of the first connecting surface. As a result, when the same amount of external force is applied, the relative contact area of ​​the extension is smaller (due to the smaller first dimension), and the relative force is also smaller. The adhesive on the first polarizer is less likely to detach, thus avoiding the problem of whitening at the visual edges of the display device.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description

[0024] Figure 1 This is a partial schematic diagram of the display device of the present invention.

[0025] Figure 2 This is another partial schematic diagram of the display device in this invention.

[0026] Figure 3 for Figure 2 Enlarged diagram of point B in the middle.

[0027] Figure 4 This is a partial schematic diagram of the first sidewall of the display device in this invention after the adhesive has been applied and cured. Detailed Implementation

[0028] To provide a further understanding of the purpose, structure, features and functions of the present invention, detailed descriptions are provided below with reference to embodiments.

[0029] Figure 1 This is a partial schematic diagram of the display device of the present invention. Figure 2 This is another partial schematic diagram of the display device in this invention. Figure 3 for Figure 2 A magnified view of point B in the middle. Please refer to the diagram. Figures 1-3 The frameless display device 2000 includes a display panel 20, a first polarizer 21, and an adhesive portion 26. The display panel 20 has a first sidewall 203 (marked as...). Figure 4 In this embodiment, the direction perpendicular to the first sidewall 203 (the plane in which it is located) of the display panel 20 is defined as the first direction X; the thickness direction of the display panel 20 (i.e., the thickness direction of the display device 2000) is defined as the second direction Z (or the direction perpendicular to the light-emitting surface of the display panel 20 is called the second direction). The display panel 20 includes a first substrate 201 and a second substrate 202 disposed opposite to each other. A display medium (e.g., a liquid crystal molecule layer, not shown) is sandwiched between the first substrate 201 and the second substrate 202. In this embodiment, the first substrate 201 is an array substrate and the second substrate 202 is a color filter substrate. In other words, in this embodiment, the array substrate is stacked on the color filter substrate. A first polarizer 21 is stacked on the light-emitting surface of the display panel 20 (i.e., a first polarizer 21 is stacked on the outer side of the first substrate 201 (array substrate 201)), and a second polarizer 22 is stacked on the outer side of the second substrate 202.

[0030] like Figure 2 and Figure 3 As shown, the first polarizer 21 has a connected body portion 211 and an extension portion 212. The body portion 211 is stacked on the light-emitting surface of the display panel 20, and the extension portion 212 extends from the body portion 211 along the first direction X. That is, the extension portion 212 is the first polarizer 21 on the light-emitting surface of the display panel 20. Figure 2 The portion extending beyond the display panel 20 (specifically, the first substrate 201 extending beyond the display panel 20) in the first direction X shown.

[0031] Please refer to this as well. Figure 2 and Figure 3The adhesive portion 26 covers the first sidewall 203 of the display panel and the bottom surface of the extension portion 212. The adhesive portion 26 forms a first adhesive surface 2601 on the bottom surface of the extension portion 212, and the adhesive portion 26 forms a second adhesive surface 2602 on the first sidewall 203 of the display panel 20. The first adhesive surface 2601 has a first dimension Q1 in the first direction X. The adhesive portion 26 also has a first connecting surface 2603 and a second connecting surface 2604. The first adhesive surface 2601, the first connecting surface 2603, the second connecting surface 2604, and the second adhesive surface 2602 are sequentially connected, and the first connecting surface 2603 and the second connecting surface 2604 intersect to form a first intersection top 2607 in the first direction X. In the first direction X, the first intersection top 2607 and the first sidewall 203 have a top dimension Qmax (or, in the first direction X, the first intersection top 2607 to the second adhesive surface 2602 has a top dimension Qmax). The first dimension Q1 is not greater than the top dimension Qmax and is not greater than 250um. In this embodiment, the first dimension Q1 is smaller than the top dimension Qmax, that is, in the first direction X, the first intersection top 2607 extends beyond the extension portion 212.

[0032] In the display device 2000 of the present invention, the design of the first dimension Q1 of the first adhesive surface 2601 formed by the adhesive portion 26 on the bottom surface of the first polarizer 21 and the top dimension Qmax between the first junction top 2607 formed by the first connecting surface 2603 and the second connecting surface 2604 and the first side wall 203 of the display panel 20 makes it possible for the first polarizer 21 (especially the extension portion 212) to have a relatively small contact area and a relatively small force when the display device 2000 is subjected to external force. This ensures that the adhesive (adhesive portion 26) exposed on the first polarizer 21 is not easy to fall off, thereby avoiding the problem of whitening at the edges.

[0033] Furthermore, such as Figure 3 As shown, the first adhesive surface 2601 intersects with the first connecting surface 2603 to form a second junction top 2606, the first adhesive surface 2601 intersects with the second adhesive surface 2602 to form a third junction top 2605, and the second adhesive surface 2602 intersects with the second connecting surface 2604 to form a fourth junction top 2608. In the second direction Z, the fourth junction top 2608 is located below the first junction top 2607, meaning that in the second direction Z, the fourth junction top 2608 is further away from the light-emitting surface of the display panel 20 than the first junction top 2607. The first connecting surface 2603 has a second dimension Q2 between the second junction top 2606 and the first junction top 2607, and the second dimension Q2 is at least twice the first dimension Q1.

[0034] like Figure 2 and Figure 3As shown, the vertical projection of the first junction top 2607 onto the first sidewall 203 is located on the second substrate 202. Along the second direction Z, the distance between the first junction top 2067 and the second junction top 2606 is much greater than the distance between the first junction top 2607 and the fourth junction top 2608, thus ensuring that the first connection surface 2603 has a sufficient area.

[0035] In the display device 2000 of the present invention, the first dimension Q1 and the top dimension Qmax of the first adhesive surface 2601 are designed such that the second dimension Q2 of the first connecting portion 2603 has a sufficient size, for example, at least twice the size of the first dimension Q1, which increases the contact area of ​​the adhesive portion 260 under force. When the display device 2000 is subjected to external force, the first polarizer 21 (especially the extension portion 212) has a relatively small contact area ratio and is subjected to less force, and the adhesive exposed on the first polarizer 21 is not easy to fall off.

[0036] In one embodiment, in the thickness direction (i.e., the second direction Z) of the display panel 20, the adhesive portion 26 has a first thickness Q3 (the first thickness Q3 is the distance between the third junction top 2605 and the fourth junction top 2608 of the second adhesive surface 2602), and the first thickness Q3 is greater than the second dimension Q2; further, the first thickness Q3 is between 2 and 4 times the first dimension Q1. In one embodiment, in the second direction Z, the adhesive portion 260 does not extend beyond the lower surface of the display panel 20 (i.e., the lower surface of the second substrate 202).

[0037] In one embodiment, the first dimension Q1 is between 200µm and 250µm, and the ratio of the first dimension Q1 to the top dimension Lmax is between 0.67 and 1, for example, the top dimension Qmax is between 250µm and 300µm. This ensures that the second dimension Q2 is controlled to be no less than 500µm. Through the above control of the numerical parameters of the first dimension Q1, the top dimension Lmax, and the second dimension Q2, the side of the adhesive part 260 forms a wide sloping surface (first connecting surface 2603) that smoothly transitions inward from the top (first adhesive surface 2601) and a thick adhesive part body (the area marked by Qmax in the figure). When an external object (such as a robot arm, jig, etc.) contacts the side of the panel and generates an external force, the external force is first and mainly borne by the wide sloping first connecting surface 2603 and the second connecting surface 2604. In contrast, the edge (i.e., extension 212) of the first polarizer 21 accounts for a significantly smaller proportion of the total contact area, and the compressive stress or shear force it bears is also greatly reduced. This effectively prevents damage to the first polarizer 21 and detachment of the adhesive portion 260, thereby avoiding the problem of visual whitening at the edge. In one embodiment, the first thickness Q3 is ≥700µm, but is not limited thereto.

[0038] In one embodiment, such as Figure 3 As shown, the second connecting surface 2604 is a curved surface that bulges outward in the second direction Z in a direction away from the light-emitting surface, i.e. Figure 2 and Figure 3 In the first connecting surface 2603, the second connecting surface 2604 is a downwardly convex curved surface. The first connecting surface 2603 is an inclined plane, which is formed by cutting along a preset path (determined by cutting parameters) by a cutting blade.

[0039] Furthermore, the display device 2000 also includes a backlight module 23, which includes, for example, a backplate with an accommodating space, a light source, and optical module sheets, with the light source and optical film assembly located within the aforementioned accommodating space. Further, the backplate provides a supporting surface, on which the display panel 20 (along with the first polarizer 21 and the second polarizer 22) is fixedly supported via adhesives, and the surrounding sidewalls of the display panel 20 protrude from the backplate. When the display device 2000 is operating, the light provided by the backlight module 23 sequentially enters the second polarizer 22, the second substrate 202 (color filter substrate), and the first substrate 201 (array substrate) before exiting from the first polarizer 21. Figure 1 and Figure 2 As shown, the second polarizer 22 does not extend beyond the second substrate 202 (i.e., the color filter substrate 202) in the first direction X, so as to facilitate the bonding and fixing of the display panel 20 and the backlight module 23.

[0040] The present invention also provides a method for manufacturing a borderless display device 2000, the method comprising:

[0041] Step A: Fabricate and form a display panel 20, which has a first sidewall 203;

[0042] Step B involves providing a first polarizer 21, which has a connected body portion 211 and an extension portion 212. The body portion 211 is stacked on the light-emitting surface of the display panel 20, and the extension portion 212 extends from the body portion 211 along a first direction X.

[0043] Step C, an adhesive is provided to cover the first sidewall 203 of the display panel 20 and the bottom surface of the extension 212 to form an adhesive portion 26, wherein the adhesive portion 26 forms a first adhesive surface 2601 on the bottom surface of the extension 212.

[0044] The first adhesive surface 2601 has a first dimension Q1 in the first direction X. The adhesive part 26 also has a first connecting surface 2603 and a second connecting surface 2604. The first connecting surface 2603 is connected between the first adhesive surface 2601 and the second connecting surface 2604. The first connecting surface 2603 and the second connecting surface 2604 intersect to form a first intersection top 2607. The first intersection top 2607 and the first sidewall 203 have a top dimension Qmax in the first direction X. The first dimension Q1 is not greater than the top dimension Qmax and is not greater than 250um.

[0045] Please refer to Figure 4 , Figure 4 This is a schematic diagram showing the first sidewall of the display device after adhesive application and curing in this invention. In step B, when providing the first polarizer 21, the first polarizer 21 has a connected body portion 211 and a protrusion 213. The body portion 211 is stacked on the light-emitting surface of the display panel 20, and the protrusion 213 extends from the body portion 211 along the first direction X. In step C, the adhesive is applied to at least a portion of the bottom surface (at least including the portion of the bottom surface adjacent to the first sidewall 203) of the display panel 20 and then cured to obtain the adhesive layer 24.

[0046] In one embodiment, the extension 212 and the adhesive portion 26 are obtained by obliquely cutting the portion of the first polarizer 21 extending beyond the first sidewall 203 and the cured adhesive along a predetermined path after the adhesive has cured. For example, along... Figure 4 The oblique cutting line shown (relative to the normal direction of the light-emitting surface of the display panel 20) obliquely laser cuts the protrusion 213 of the first polarizer 21 that extends beyond the first sidewall 203 to obtain the desired result. Figure 2 The extension 212 shown (i.e., the extension mentioned above) is the portion remaining after the protrusion 213 has been cut off. At this point, the extension 212 still extends beyond the display panel 20 in the first direction X. (Oblique cut) Figure 4 After the adhesive layer 24 (formed after the adhesive cures) is obtained Figure 2 The adhesive portion 26 shown (i.e., the adhesive portion 26 mentioned above) is the portion remaining after the adhesive layer 24 is cut, and the adhesive portion 26 covers the first sidewall 203 of the display panel 20 and the bottom surface of the extension 212.

[0047] like Figure 2 and Figure 4As shown, since the cutting is performed along an oblique path, the dimension of the upper surface of the extension 212 in the first direction X is smaller than the dimension of the lower surface of the extension 212 in the first direction X, wherein the dimension of the lower surface of the extension 212 in the first direction X is equal to the aforementioned first dimension Q1. The extension 212 has an exposed side along the oblique cutting direction, and this exposed side is flush with the aforementioned first connecting surface 2603, and the dimension of the exposed side is much smaller than the dimension of the first connecting surface 2603 along the oblique cutting direction.

[0048] In summary, in the display device of the present invention, the first dimension of the adhesive portion between the first sidewall of the display panel and the bottom surface of the extension of the first polarizer is controlled to be no greater than the top dimension and no greater than 250µm, thereby increasing the second dimension of the first connecting surface. As a result, when the same amount of external force is applied, the relative contact area of ​​the extension is smaller (due to the smaller first dimension), and the relative force is also smaller. The adhesive on the first polarizer is less likely to detach, thus avoiding the problem of edge whitening in the display device.

[0049] Although the invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to illustrate preferred embodiments of the invention and should not be construed as limiting the invention. The scale in the schematic drawings does not represent the actual proportions of the components, in order to clearly describe the required parts.

[0050] The present invention has been described in the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A bezel-less display device, characterized by, The borderless display device includes: A display panel having a first sidewall, wherein a direction perpendicular to the first sidewall is defined as a first direction; A first polarizer has a body portion and an extension portion connected together. The body portion is stacked on the light-emitting surface of the display panel, and the extension portion extends from the body portion along the first direction. An adhesive portion covers the first sidewall of the display panel and the bottom surface of the extension portion. The adhesive portion forms a first adhesive surface on the bottom surface of the extension portion and a second adhesive surface on the first sidewall. The first adhesive surface has a first dimension in the first direction, and the adhesive part also has a first connecting surface and a second connecting surface. The first adhesive surface, the first connecting surface, the second connecting surface and the second adhesive surface are connected in sequence, and the first connecting surface and the second connecting surface intersect to form a first intersection top. The first intersection top and the first sidewall have a top dimension in the first direction. The first dimension is not greater than the top dimension and the first dimension is not greater than 250um. 2.The bezel-less display apparatus of claim 1, wherein, The vertical projection of the top of the first junction onto the first sidewall is located on the second substrate. 3.The bezel-less display apparatus of claim 1, wherein, The first adhesive surface intersects with the first connecting surface to form a second joint top. The first connecting surface has a second dimension from the second joint top to the first joint top, and the second dimension is at least twice the first dimension. 4.The bezel-less display apparatus of claim 3, wherein, In the thickness direction of the display panel, the adhesive portion has a first thickness, which is greater than the second dimension; or, the first thickness is between 2 and 4 times the first dimension. 5.The bezel-less display apparatus according to claim 3, wherein, The first dimension is between 200um and 250um; the ratio of the first dimension to the top dimension is between 0.67 and 1; the second dimension is not less than 500um. 6.The frameless display apparatus of claim 1, wherein, The first connecting surface is an inclined plane, and the second connecting surface is a curved surface. 7.The frameless display apparatus of claim 1, wherein, The display panel includes a color filter substrate and an array substrate disposed opposite each other, and the first polarizer is located on the array substrate. The display device also includes a backlight module, and the display panel is supported on the backlight module. The light provided by the backlight module enters the color filter substrate and the array substrate in sequence and is emitted from the first polarizer. 8.The borderless display apparatus according to claim 7, The display device further includes a second polarizer disposed on the color filter substrate, and the second polarizer does not extend beyond the color filter substrate in the first direction.

9. A method for manufacturing a borderless display device, characterized in that, include: A display panel is fabricated, the display panel having a first sidewall; A first polarizer is provided, the first polarizer having a connected body portion and an extension portion, the body portion being stacked on the light-emitting surface of the display panel, and the extension portion extending out from the body portion along a first direction; and An adhesive is provided to cover the first sidewall of the display panel and the bottom surface of the extension to form an adhesive portion, wherein the adhesive portion forms a first adhesive surface on the bottom surface of the extension; The first adhesive surface has a first dimension in the first direction, and the adhesive part also has a first connecting surface and a second connecting surface. The first connecting surface is connected between the first adhesive surface and the second connecting surface. The first connecting surface and the second connecting surface intersect to form a first intersection top. The first intersection top and the first sidewall have a top dimension in the first direction. The first dimension is not greater than the top dimension and is not greater than 250um.

10. The method for manufacturing a borderless display device according to claim 9, characterized in that, After the adhesive cures, the first polarizer is cut at an angle in the first direction, extending beyond the first sidewall, along with a portion of the partially cured adhesive, to form the extension and the adhesive portion.

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