1. A display panel, wherein the display panel has a visible region and a frame region surrounding the visible region, the display panel comprising:

the touch module comprises a diaphragm, wherein a printed circuit is arranged on the surface of the diaphragm;

the insulating glue is arranged corresponding to the frame area, a first opening is formed in the top corner of the frame area, the optical transparent adhesive is arranged corresponding to the visual area, and the first opening of the insulating glue is filled with the optical transparent adhesive; and

and the protective film is attached to one side of the insulating adhesive, which faces away from the printed circuit, and one side of the optically transparent adhesive, which faces away from the printed circuit.

2. The display panel according to claim 1, wherein the bezel area is square and has two opposite long sides and two opposite short sides perpendicular to the long sides, and the insulating adhesive is disposed on the short sides and a middle section of the long sides to form the first opening at a top corner of the bezel area.

3. The display panel according to claim 2, wherein a binding section for binding the flexible circuit board is disposed in a middle section of one of the long sides, an extending direction of the binding section is the same as an extending direction of the long side, and the insulating glue and the binding section disposed in the middle section of the long side are juxtaposed in the extending direction of the short side.

4. The display panel according to claim 3, wherein extension sections are provided at two ends of the insulating glue located in the middle section of the long side, and the extension sections and the insulating glue enclose to form an enclosing structure with a second opening;

the bound section is located within the enclosure.

5. The display panel of claim 4, wherein the second opening of the enclosure is disposed toward an edge of the display panel.

6. The display panel according to claim 4, wherein the binding section is provided with a plurality of pads extending in an extending direction of the long side;

the length of the extension section along the extension direction of the short side is larger than the length of the pad along the extension direction of the short side.

7. The display panel according to claim 4, wherein the distance D1 between the extension segment and the binding segment satisfies the condition:

D1≥0.7mm。

8. the display panel according to claim 3, wherein the optically transparent adhesive overlaps the insulating paste juxtaposed to the binding segment in the extending direction of the short side, and a width W of an overlapping portion of the optically transparent adhesive and the insulating paste satisfies a condition:

W≥0.6mm。

9. the display panel according to any one of claims 1 to 8, wherein a distance D2 between the insulating paste and the display area satisfies a condition:

D2≥0.4mm。

10. a terminal device characterized by comprising the display panel according to any one of claims 1 to 9.

Background

For the display panel with touch function, in the manufacturing process of the display panel, in order to avoid the printed circuit on the touch module substrate from being damaged, the display panel may print insulating glue corresponding to a frame region outside a visible region (VA), attach an Optically transparent Adhesive (OCA) corresponding to an operable region (Active Area, AA) to comprehensively cover the printed circuit, avoid the printed circuit from being exposed, and attach a protective film on the basis of the insulating glue to protect the printed circuit, wherein the protective film of the silicone system may have silicone residue to reduce a surface factor value, which causes abnormal Adhesive opening, so that an acrylic protective film without silicone oil is adopted to avoid the abnormal Adhesive opening phenomenon. However, acrylic has high stiffness and weak customer service section difference capacity, after the protective film is attached, section difference bubbles are formed between the insulating adhesive and the protective film, and the section difference bubbles are gathered at the corners of the insulating adhesive to form corner large bubbles due to the fact that the shape of the insulating adhesive is generally in a square shape consistent with that of the frame area, so that subsequent testing performance of the display panel is affected.

Disclosure of Invention

Therefore, it is necessary to provide a display panel and a terminal device for solving the problem that corner large bubbles are generated between a protective film and an insulating adhesive during the bonding process of the display panel, which results in the degradation of the subsequent test performance of the display panel.

A display panel having a visible region and a bezel region surrounding the visible region, the display panel comprising: the touch module comprises a diaphragm, wherein a printed circuit is arranged on the surface of the diaphragm; the insulating glue is arranged corresponding to the frame area, a first opening is formed in the top corner of the frame area, the optical transparent adhesive is arranged corresponding to the visual area, and the first opening of the insulating glue is filled with the optical transparent adhesive; and the protective film is attached to one side of the insulating adhesive, which faces away from the printed circuit, and one side of the optically transparent adhesive, which faces away from the printed circuit.

In an embodiment of the invention, the frame area is disposed in a square shape, and has two opposite long sides and two opposite short sides perpendicular to the long sides, and the insulating glue is disposed on the short sides and the middle section of the long sides to form the first opening at the vertex angle of the frame area.

In an embodiment of the present invention, a binding section for binding the flexible circuit board is disposed in a middle section of one of the long sides, an extending direction of the binding section is the same as an extending direction of the long side, and the insulating glue located in the middle section of the long side and the binding section are disposed in parallel along the extending direction of the short side.

In an embodiment of the invention, extension sections are arranged at two ends of the insulating glue positioned in the middle section of the long side, and the extension sections and the insulating glue are enclosed to form an enclosing structure with a second opening; the bound section is located within the enclosure.

In an embodiment of the invention, the second opening of the enclosing structure is disposed toward the edge of the display panel.

In an embodiment of the present invention, the binding section is provided with a plurality of pads extending along an extending direction of the long side; the length of the extension section along the extension direction of the short side is larger than the length of the pad along the extension direction of the short side.

In an embodiment of the present invention, the distance D1 between the extension segment and the binding segment satisfies the condition: d1 is more than or equal to 0.7 mm.

In an embodiment of the present invention, the optically transparent adhesive overlaps the insulating adhesive juxtaposed to the binding segment along the extending direction of the short side, and a width W of an overlapping portion of the optically transparent adhesive and the insulating adhesive satisfies a condition: w is more than or equal to 0.6 mm.

In an embodiment of the present invention, a distance D2 between the insulating paste and the display area satisfies a condition: d2 is more than or equal to 0.4 mm.

A terminal device is characterized by comprising the display panel.

The display panel comprises a touch module, insulating glue, an optically transparent adhesive and a protective film, wherein the touch module comprises a membrane, and the surface of the membrane is provided with a printed circuit; the insulating glue corresponds the frame district setting of display panel to apex angle department in the frame district is equipped with first opening, and the transparent gluing agent of optics corresponds the visual zone setting of display panel, and the transparent gluing agent of optics fills the first opening part of insulating glue, thereby utilizes the cooperation of insulating glue and transparent gluing agent of optics to cover the printed circuit on diaphragm surface, avoids the printed circuit to expose. And the protection film is attached to one side of the insulating glue back to the printed circuit and one side of the optically transparent adhesive back to the printed circuit, and because the insulating glue is provided with a first opening at the top corner of the frame area, after the protection film is attached, the section difference bubbles between the insulating glue and the protection film can escape from the first opening after standing, and can not be gathered at the corner to form corner large bubbles, thereby ensuring good subsequent test performance of the display panel.

Drawings

Fig. 1 is a side expanded view of printed circuits disposed on two side surfaces of a film of a touch module in the related art;

FIG. 2 is a cross-sectional view of a touch module having printed circuits disposed on two side surfaces of a diaphragm;

FIG. 3 is a side view of the touch module according to an embodiment of the present invention, wherein printed circuits are disposed on two side surfaces of the film;

FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3;

FIG. 5 is a cross-sectional view of printed circuits disposed on two side surfaces of a diaphragm of a touch module according to an embodiment of the present invention;

fig. 6 is a schematic view of the arrangement of the insulating paste corresponding to the binding section in fig. 3.

The reference numbers illustrate:

100: visual area 410: first opening

200: frame area 420: extension section

210: the binding section 430: second opening

211: bonding pad 500: optically transparent adhesive

300: a diaphragm 600: light-transmitting cover plate

310: the printed wiring 700: adhesive layer

400: insulating glue

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 and 2, fig. 1 is a side expanded view illustrating a printed circuit disposed on both side surfaces of a film of a touch module according to the related art, and fig. 2 is a cross-sectional view illustrating a printed circuit disposed on both side surfaces of a film of a touch module according to the related art. In the related art, the display panel generally includes a View Area 100 (VA) and a bezel Area 200 positioned around the View Area 100. For the touch display screen, in the manufacturing process of the display panel, in order to avoid damaging the printed circuit 310 printed on the film 300 of the touch module in the assembling process, the insulating Adhesive 400 is printed corresponding to the frame Area 200 around the visible Area 100, and the Optically Clear Adhesive 500 (OCA) is attached corresponding to the operable Area (AA) to cover the printed circuit 310 and prevent the printed circuit 310 from being exposed. And further attaching a protective film for protection on the basis. Meanwhile, a transparent cover 600 is usually disposed on one side of the touch module, and the adhesive layer 700 is used to attach the transparent cover 600 to the touch module, so as to facilitate the touch operation of the user. Wherein the composition of the optically transparent adhesive further comprises at least one of a defoamer (defoamer), an ultraviolet absorber (ultra-violet light absorber), a light stabilizer (light stabilizer), a silane coupling agent (silane coupling agent), an antioxidant (antioxidant), or a combination thereof in an amount of up to 41-45 wt%. To improve the overall adhesion and to avoid bubbles.

The commonly used silicone protective film can generate silicone residue, so that the surface dyne value is reduced, and the glue is abnormally opened, and therefore, in order to avoid the problem of abnormal glue opening, the acrylic protective film without silicone oil is selected for protection. And the protection film of ya keli material is stronger, the poor ability of customer service segment is relatively weak, with the protection film post-attached, there is the poor bubble of segment between insulating cement 400 and the protection film, and because the shape of insulating cement 400 is the mouth font unanimous with the shape of border district 200 usually, when the protection film is attached in one side of insulating cement 400, form sealed space between protection film and the insulating cement 400, make the poor bubble of segment between insulating cement 400 and the protection film unable discharge, consequently, the protection film post-attached, the poor bubble of segment between protection film and the insulating cement 400 can form the corner big bubble at the edge of insulating cement 400 gathering, thereby influence the subsequent test performance of display panel. Accordingly, there is a need for a display panel that solves the problem of large bubbles at the corners to ensure the subsequent testing performance of the display panel.

Referring to fig. 3 to 5, fig. 3 is a side expanded view illustrating printed circuits disposed on two side surfaces of a film of a touch module according to an embodiment of the invention, fig. 4 is a cross-sectional view taken along a-a direction in fig. 3, and fig. 5 is a cross-sectional view illustrating printed circuits disposed on two side surfaces of the film of the touch module according to an embodiment of the invention. The display panel according to an embodiment of the present invention has a visible area 100 and a frame area 200, wherein the visible area 100 is used for displaying a picture, and the frame area 200 is disposed around the visible area 100. The display panel includes a touch module, an insulating adhesive 400, an optically transparent adhesive 500, and a protective film. The touch module comprises a membrane 300, wherein a printed circuit 310 is arranged on the surface of the membrane 300; the frame district 200 setting that insulating cement 400 corresponds display panel to be equipped with first opening 410 in the apex angle department of frame district 200, the setting of the visual district 100 that optical transparent gluing agent 500 corresponds display panel, and optical transparent gluing agent 500 fills first opening 410 department of insulating cement 400, thereby utilize insulating cement 400 and optical transparent gluing agent 500 cooperation to cover the printed circuit 310 on diaphragm 300 surface, avoid printed circuit 310 to expose, and then reach the purpose of protection printed circuit 310. And the protection film is then attached in the one side of insulating cement 400 back to printed wiring 310 and the one side of optically transparent gluing agent 500 back to printed wiring 310, because insulating cement 400 is equipped with first opening 410 in the apex angle department of frame district 200, make after the protection film is attached, the poor bubble of section that exists between insulating cement 400 and the protection film can be followed first opening 410 and escaped after stewing, compare in traditional setting up insulating cement 400 into the square shape, can avoid forming the big bubble of corner in the gathering of corner, thereby the subsequent test performance of guarantee display panel is good. Wherein, the protection film comprises an acrylic protection film.

In an embodiment, the film 300 has a first side and a second side opposite to each other, the first side and the second side of the film 300 are both provided with the printed circuits 310, one side of the printed circuit 310 on the first side facing away from the film 300 is provided with the insulating adhesive 400 corresponding to the frame area 200 and is provided with the optically transparent adhesive 500 corresponding to the visible area 100, and one side of the printed circuit 310 on the second side facing away from the film 300 can be covered by another layer of optically transparent adhesive and is attached to the cover plate to protect the printed circuits 310 on both sides of the film 300.

In some embodiments, the frame region 200 is square and has two opposite long sides and two opposite short sides perpendicular to the long sides, and the insulating glue 400 is disposed on the short sides and the middle section of the long sides to form the first opening 410 at the top corner of the frame region 200. By arranging the insulating glue 400 on the short side and the middle section of the long side, on one hand, the first opening 410 can be formed at the top corner of the frame area 200, so that after the protective film is attached, the level difference bubbles existing between the insulating glue 400 and the protective film can escape from the first opening 410 after standing, and can not be gathered at the corner to form large corner bubbles; on the other hand, the insulating glue 400 is only arranged on the short side and the middle section of the long side of the frame area 200, so that the using amount of the insulating glue 400 can be reduced to a great extent, the material is saved, and the production cost is reduced. For example, in one embodiment, the insulating paste 400 is disposed only on the two short sides and the middle section of one long side of the frame region 200, so that the amount of the insulating paste 400 is reduced by 30%, thereby greatly reducing the cost.

In some embodiments, the frame area 200 is square and has two opposite long sides and two opposite short sides perpendicular to the long sides, and the insulating glue 400 is disposed on the short sides and the middle section of one of the long sides, at this time, the insulating glue 400 forms a first opening 410 at two adjacent top corners of the frame area 200 and forms another opening with the other long side opposite to the long side on which the insulating glue 400 is disposed. Because only the interlude on a long limit in minor face and two long limits has set up insulating cement 400 for the quantity greatly reduced of insulating cement 400 that uses on single diaphragm 300, thereby save material, reduction in production cost, meanwhile, can solve again and produce the big bubble in corner between protection film and the insulating cement 400, lead to the problem of the subsequent test performance reduction of display panel.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating an arrangement of the insulating paste corresponding to the binding section in fig. 3. In some embodiments, the middle section of one of the two long sides of the frame region 200 is provided with a binding section 210 for binding the flexible circuit board, the extending direction of the binding section 210 is the same as the extending direction of the long side, and the insulating glue 400 located in the middle section of the long side and the binding section 210 are arranged in parallel along the extending direction of the short side. The insulating glue 400 and the binding section 210 are arranged in parallel along the extending direction of the short side of the frame area 200, so that the side of the binding area is protected, and meanwhile, the insulating glue 400 is prevented from extending to the binding section 210 to influence the binding of the flexible circuit board.

In some embodiments, the two ends of the insulating glue 400 located in the middle section of the long side are provided with extension sections 420, and the extension sections 420 and the insulating glue 400 are enclosed to form an enclosing structure with a second opening 430; the bound sections 210 are located within the enclosure. The extending sections 420 are arranged at the two ends of the insulating adhesive 400 positioned at the middle section of the long edge of the frame area 200, the extending sections 420 and the insulating adhesive 400 are used for enclosing to form an enclosing structure with the second opening 430, so that the binding section 210 is positioned in the range of the enclosing structure, meanwhile, the second opening 430 is arranged, the flexible circuit board is convenient to bind, the binding section 210 is avoided, the binding of the binding section 210 and the flexible circuit board is prevented from being hindered, and the periphery of the binding section 210 can play a role in protection.

In some embodiments, the second opening 430 of the enclosing structure is disposed toward an edge of the display panel. Through the edge setting that will surround the second opening 430 of structure towards display panel for at the in-process of binding with the flexible circuit board, can dodge the flexible circuit board, make binding of flexible circuit board more convenient.

In some embodiments, the binding section 210 is provided with a plurality of pads 211 extending in the extending direction of the long side; the length of the extension section 420 in the extending direction of the short side is larger than the length of the pad 211 in the extending direction of the short side. The length of the extension section 420 in the extension direction of the short side is set to be greater than that of the pad 211 in the extension direction of the short side, so that the pad 211 can be protected more completely without affecting the welding of the pad 211. For example, in one embodiment, the insulating glue 400 and the extending portions at both ends are U-shaped, and the bonding pad 211 is located within a half-surrounding range of the U-shape.

In some embodiments, the distance D1 of the extension segment 420 from the binding segment 210 satisfies the condition: d1 is greater than or equal to 0.7mm, so that the insulating glue 400 is prevented from extending to the pad 211 of the binding section 210 to influence the binding of the flexible circuit board. For example, in one embodiment, the distance D1 between the extension segment 420 and the binding section 210 is equal to 1mm, so as to prevent the insulating glue 400 from extending onto the pad 211 of the binding section 210 to affect the binding of the flexible circuit board. It is understood that, in the above embodiments, the distance between the extension segment 420 and the binding segment 210 refers to the distance between the extension segment 420 and the closest part of the binding segment 210, for example, when the binding segment 210 is provided with a plurality of spaced and parallel pads, the distance between the extension segment 420 and the binding segment 210 refers to the distance between the extension segment 420 and the pad closest to the extension segment 420, and the condition is satisfied by defining the distance D1 between the extension segment 420 and the binding segment 210: d1 is larger than or equal to 0.7mm, so that the insulating glue 400 is better ensured not to extend to any bonding pad, the flexible circuit board is effectively bound, and the effect of effective electrical connection is achieved.

In some embodiments, the optically clear adhesive 500 overlaps the insulating paste 400 juxtaposed to the binding section 210 in the extending direction of the short side, and the width W of the overlapping portion of the optically clear adhesive 500 and the insulating paste 400 satisfies the condition: w is larger than or equal to 0.6mm, so that the optical transparent adhesive 500 and the insulating adhesive 400 are overlapped enough to completely cover the printed circuit 310 and prevent the printed circuit 310 from being exposed. For example, in an embodiment, the width W of the overlapping portion of the optically transparent adhesive 500 and the insulating paste 400 is equal to 1.8mm, so as to ensure that the width of the overlapping portion of the optically transparent adhesive 500 and the insulating paste 400 is larger, and further to better cover the printed circuit 310 completely, and prevent the printed circuit 310 from being exposed.

In the above embodiment, the distance D2 between the insulating paste 400 and the display area satisfies the condition: d2 is more than or equal to 0.4 mm. It can be understood that, when the distance between the insulating glue 400 and the display area is smaller, the possibility that the insulating glue 400 enters the display area is higher, so that the appearance of the display panel is prone to be poor, and therefore, the distance D2 between the insulating glue 400 and the display area is set to be greater than or equal to 0.4mm in the above embodiment, so as to avoid the insulating glue 400 entering the display area, thereby ensuring that the appearance of the display panel is good. For example, in one embodiment, the distance D2 between the insulating paste 400 and the display area is equal to 0.5mm, so as to prevent the insulating paste 400 from entering the display area, thereby ensuring good appearance of the display panel.

In an embodiment, the width of the overlapping portion of the optically transparent adhesive 500 and the insulating adhesive 400 is equal to 1.8mm, and the distance between the optically transparent adhesive 500 and the bonding pad 211 is equal to 0.95mm, so that the width of the overlapping portion of the optically transparent adhesive 500 and the insulating adhesive 400 is ensured to be large, the printed circuit 310 is better covered, the printed circuit 310 is prevented from being exposed, the optically transparent adhesive 500 is separated from the bonding pad 211, the flexible circuit board is prevented from being hindered from being bound, and the flexible circuit board can be effectively electrically connected.

In the field of touch panel technology, a transparent conductive film is generally used as a sensing element for sensing an input signal such as a touch. Generally, a transparent conductive film includes a transparent substrate and a conductive layer disposed on the transparent substrate. And Metal Mesh is a transparent electrode made of Metal grid lines with line width less than 4 microns. Compared with the original touch technology, the Metal-Mesh touch technology has the characteristics of low power consumption, sensitive touch, long service life and the like, and has the characteristics of flexibility, water resistance, explosion resistance, no pollution and the like. The unique characteristics extend the application of Metal-Mesh to special touch control such as outdoor information inquiry, curved surface special-shaped touch control, single spherical surface touch control and the like. The touch panel can be applied to the fields of mass consumer electronics such as mobile phones, PADs (tablet personal computers), GPS (global navigation system) and the like, and along with the development of touch technology, the touch panel can be rapidly expanded to the fields of intelligent homes (such as touch televisions, touch refrigerators, touch kitchens, touch tea tables and the like), interactive digital signage, interactive exhibition and display, interactive teaching and the like. In some embodiments, the touch module includes Metal-Mesh disposed on two opposite sides of the membrane 300, and one side of the Metal-Mesh facing away from the membrane 300 is covered by the insulating adhesive 400 and the optically transparent adhesive 500. Referring to fig. 5, in an embodiment, a transparent cover 600 is disposed on one side of the touch module, and the transparent cover 600 is attached to the touch module by an adhesive layer 700, so as to facilitate touch operation of a user.

The present invention further provides a terminal device, which includes the display panel, and since the terminal device has all technical features of the display panel, the terminal device has all technical effects in the above embodiments, and details are not repeated herein.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.