TW201314515A - Touch panel, touch display panel using the same and adhering method thereof - Google Patents

Abstract

A touch panel, a touch display panel using the same and an adhering method thereof are provided. The touch panel comprises a sensing panel, a cover glass, a close ring dam and a viscose. The close ring dam is disposed between the sensing panel and the cover glass. The close ring dam has a plurality of apertures and surrounds a receiving space. Each aperture connects the receiving space and the exterior of the close ring dam. The viscose is formed within the receiving space, and sensing panel and a cover glass adhere by the viscose.

Description

Touch panel and touch display panel using same and bonding method thereof

The present invention relates to a touch panel and a touch display panel using the same, and more particularly to a touch panel capable of reducing the amount of glue overflowed and a touch display panel using the same and a method for attaching the same.

The conventional touch panel includes an inductive substrate and a cover glass. The sensing substrate and the protective cover are adhered through the liquid optical film.

In the bonding process, there is no support between the protective cover and the sensing substrate. Therefore, before the protective cover and the sensing substrate are uncured after bonding, the substrate is continuously affected by gravity, and the gap between the two substrates is variated and cannot be achieved. Ideal state.

In fact, the liquid optical glue located between the protective cover and the sensing substrate may cause excessive overflow due to the small gap.

The present invention relates to a touch panel and a touch display panel using the same, and the touch panel can effectively prevent excessive glue overflow during the bonding process.

According to an embodiment of the invention, a touch panel is proposed. The touch panel includes a sensing substrate, a protective cover, a retaining wall and an adhesive. The retaining wall is formed between the sensing substrate and the protective cover, and the retaining wall has an opening, and the retaining wall surrounds an accommodating space. The adhesive is formed in the accommodating space and adheres to the sensing substrate and the protective cover.

According to an embodiment of the invention, a touch display panel is proposed. The touch display panel includes a touch panel and a display panel. The touch panel includes a sensing substrate, a protective cover, a retaining wall and an adhesive. The retaining wall is formed between the sensing substrate and the protective cover, and the retaining wall has an opening, and the retaining wall surrounds an accommodating space. The adhesive is formed in the accommodating space and adheres to the sensing substrate and the protective cover. The display panel corresponds to the touch panel configuration.

According to an embodiment of the invention, a method for bonding a touch display panel is proposed. The fitting method includes the following steps. Providing a protective cover; forming a retaining wall on the protective cover, wherein the retaining wall has an opening, the retaining wall surrounds an accommodating space; forming a liquid adhesive in the accommodating space; And a sensing substrate, wherein the retaining wall is formed between the sensing substrate and the protective cover; and curing the protective cover and the sensing substrate behind the group to cure the retaining wall and the liquid adhesive.

In order to provide a better understanding of the above and other aspects of the present invention, the following detailed description of the embodiments and the accompanying drawings

Referring to FIGS. 1A and 1B, FIG. 1A is a plan view of a touch panel according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line 1B-1B' of FIG. 1A.

As shown in FIG. 1A, the touch panel 100 includes a sensing substrate 110, a cover glass 120, a barrier 130, and an adhesive 140 (the adhesive 140 is shown in FIG. 1B).

As shown in FIG. 1A, the retaining wall 130 surrounds the accommodating space SP. The adhesive 140 is formed in the accommodating space SP and adheres to the sensing substrate 110 and the protective cover 120. The adhesive 140, also known as an optical adhesive, has a refractive index close to that of the glass (or other dielectric layer adjacent to the adhesive), which reduces the effect on transmitted light passing through the adhesive.

As shown in FIG. 1B, the retaining wall 130 is formed between the sensing substrate 110 and the protective cover 120, and the retaining wall 130 has at least one opening 130a. In this embodiment, each of the openings 130a communicates with the outside of the accommodating space SP and the retaining wall 130. Preferably, but not limited to, the openings 130a are evenly distributed on the edge of the protective cover 120.

In this embodiment, the retaining wall 130 is an annular retaining wall, preferably a closed shaped retaining wall. Since the retaining wall 130 is closed, it can produce a very good barrier to the adhesive 140 to reduce or prevent the adhesive 140 from overflowing. When the width W of the opening 130a is smaller, the effect of avoiding overflow is increased. In one embodiment, the width W is between about 0.5 and 1.2 centimeters (mm).

In addition, the gas in the accommodating space SP can be discharged to the outside of the touch panel 100 through the opening 130a, and the gas is reduced or prevented from remaining in the accommodating space SP, thereby forming a defective product having bubble defects.

Referring to Fig. 1C, a cross-sectional view (direction 1C-1C' through the opening) in the direction 1C-1C' in Fig. 1A is shown. A portion of the adhesive 140 (for example, a residual glue) is formed in the opening 130a, so that the residual glue of the adhesive 140 can be reduced or prevented from overflowing to the outside of the retaining wall 130. The adhesive 140 may not exceed the outer side 130s of the retaining wall 130. Alternatively, the adhesive 140 may substantially align with the outer side 130s of the retaining wall 130. For example, the outer side 140s of the adhesive 140 may be coplanar with the outer side 130s. Alternatively, the adhesive 140 may protrude slightly beyond the outer side 130s of the retaining wall 130. Since the adhesive 140 is blocked by the retaining wall 130, the amount of the adhesive 140 protruding from the outer side 130s of the retaining wall 130 can be controlled within an acceptable or expected range. That is, even if the adhesive 140 protrudes from the outer side 130s of the retaining wall 130, it is not necessary to particularly remove (for example, by artificially rubbing) the protruding adhesive 140.

The retaining wall 130 has a variety of configurations, as exemplified below.

Returning to FIG. 1B, the retaining wall 130 may include a sub-retaining wall 131 and a plurality of separate retaining walls 132. The sub-retaining wall 131 surrounds the accommodating space SP. The separation walls 132 are disposed separately on the sub-retaining wall 131, and the adjacent two separation walls 132 and the sub-retaining wall 131 define corresponding openings 130a.

Further, the height difference H1 between the sub-retaining wall 131 and the separation retaining wall 132 is between about 50 and 200 micrometers (μm). For example, the distance between the upper surface 131u of the sub-retaining wall 131 and the upper surface 132u of the separation retaining wall 132 is between 50 and 200 microns.

Referring to FIG. 2, a cross-sectional view of a retaining wall in accordance with another embodiment of the present invention is shown. In the touch panel 200, the retaining wall 230 includes a plurality of high retaining walls 232 and a plurality of low retaining walls 231. Each of the low barrier walls 231 is connected to the adjacent two high barrier walls 232. Each of the low barrier walls 231 defines an opening 130a corresponding to the adjacent two high barrier walls 232.

In one embodiment, the width W of the opening 130a is between about 0.5 and 1.2 mm, and the thickness H2 of the high barrier 232 is between about 100 and 500 μm.

Please refer to FIG. 3, which is a cross-sectional view of a retaining wall in accordance with yet another embodiment of the present invention. In the touch panel 300, the retaining wall 330 includes a plurality of granular retaining walls 331, and the adjacent two granular retaining walls 331 are connected to each other and define corresponding openings 130a.

As shown in the enlarged view of the portion 3A' in FIG. 3, each of the granular retaining walls 331 has curved side walls 331s, and the curved side walls 331s of the granular retaining walls 331 are opposite to the curved side walls 331s of the adjacent granular retaining walls 331. A corresponding opening 130a is defined.

The structure of the retaining wall of the present invention is not limited by the above embodiments, as long as the retaining wall having at least one opening communicating with the outside belongs to the retaining wall of the embodiment of the present invention.

Please refer to FIG. 4, which is a cross-sectional view of a touch display panel according to an embodiment of the invention. The touch display panel 400 includes a display panel 410 , an outer frame 420 , and the touch panel 100 described above. In one embodiment, the touch panel 100 can be replaced with a touch panel 200 or 300. The display panel 410 is configured corresponding to the touch panel 100. The outer frame 420 surrounds the display panel 410 and the touch panel 100 to protect the display panel 410 and the touch panel 100.

Please refer to FIG. 5 to FIG. 8 , which are process diagrams of the bonding method of the touch panel of FIG. 1 .

As shown in Fig. 5, a protective cover 120 is provided. Before the step, the step of forming the light shielding layer 121 on the protective cover 120 may be included, and the light shielding layer 121 is formed on the edge of the protective cover 120. Further, the light shielding layer 121 is, for example, a black matrix.

As shown in FIGS. 6A to 7B, a retaining wall 130 (the retaining wall 130 is shown in FIG. 7A) is formed on the protective cover 120. The retaining wall 130 has at least one opening 130a. The retaining wall 130 surrounds the accommodating space SP, and each of the openings 130a communicates with the accommodating space SP and the outside of the retaining wall 130. The retaining wall 130 is formed, for example, in a region corresponding to the light shielding layer 121.

In this embodiment, the retaining wall 130 includes a sub-retaining wall 131 and a plurality of separate retaining walls 132, which can be formed in two steps, as explained below.

As shown in Figs. 6A and 6B, Fig. 6B is a cross-sectional view taken along line 6A-6B' in Fig. 6A. The sub-retaining wall 131 is formed, wherein the sub-retaining wall 131 surrounds the accommodating space SP.

In this step, the manner in which the sub-retaining wall 131 is formed is, for example, completed by the nozzle T1, and the nozzle T1 is moved along the annular path, and the retaining wall material is continuously extruded to form the sub-retaining wall 131. The nozzle T1 is, for example, a dispenser.

In addition, the amount of glue discharged from the nozzle T1 is proportional to the dispensing pressure, the coating speed, and the nozzle diameter. The thickness of the retaining wall 130 can be determined by controlling at least one of the amount of glue discharged from the nozzle T1 and the displacement speed of the nozzle T1. For example, the larger the amount of the nozzle T1 is, the larger the thickness of the sub-retaining wall 131 is; or, the nozzle T1 The slower the displacement speed, the greater the thickness of the sub-retaining wall 131.

As shown in Figs. 7A and 7B, Fig. 7B is a cross-sectional view taken along line 7A-7B' in Fig. 7A. A plurality of separating retaining walls 132 are formed, wherein the separating retaining walls 132 are separately formed on the sub-retaining wall 131, and the adjacent two separating retaining walls 132 and the sub-retaining wall 131 define corresponding openings 130a.

In this step, the nozzle T1 moves along the annular path and intermittently extrudes the retaining wall material to form the separate retaining walls 132.

As described above, the retaining wall 130 having the high and low difference structure (the sub-retaining wall 131 and the separating retaining wall 132) can be obtained by separately forming the second-order wall.

In an embodiment, in the step of forming the retaining wall 130, the retaining wall 130 may be formed while pre-curing the rear retaining wall 130 to reduce the fluidity of the retaining wall 130, making the outer shape difficult to be formed. change. For example, after forming a portion of the sub-retaining wall 131, the portion of the sub-retaining wall 131 can be pre-cured to reduce the fluidity of the portion of the sub-retaining wall 131. As another example, after forming a portion of the split retaining wall 132, the portion of the split retaining wall 132 can be pre-cured to reduce the flow of the portion of the split retaining wall 132. Further, the pre-curing method is, for example, irradiation of ultraviolet light (UV light).

The retaining wall material of the sub-retaining wall 131 and the retaining wall material of the separating retaining wall 132 may be the same or different. The retaining wall material of the sub-retaining wall 131 and the retaining wall material of the separating retaining wall 132 of the present embodiment are described by way of example. The retaining wall material can have a very high viscosity at normal temperature. However, after the retaining wall material is heated in the nozzle T1, the viscosity of the retaining wall material can be reduced to have proper fluidity. In one embodiment, the viscosity of the retaining wall material at room temperature is, for example, 100,000 centipoise (cps), and the viscosity of the retaining wall material after heating in the nozzle T1 can be reduced to 5000 cps. Further, the retaining wall material is, for example, a light-transmitting retaining wall material.

As shown in Fig. 8, a liquid adhesive 140 is formed in the accommodating space SP. The adhesive 140 has fluidity. After the adhesive 140 is formed in the accommodating space SP, it can flow to the periphery to fill the accommodating space SP. The adhesive 140 is, for example, a light-transmitting adhesive. The adhesive 140 has a viscosity of between 1000 and 4000 centipoise.

As shown in FIG. 8 , the group protection cover 120 and the sensing substrate 110 are formed, wherein the barrier wall 130 is formed between the sensing substrate 110 and the protective cover 120.

Then, the protective cover 120 and the sensing substrate 110 after the pair are cured to completely cure the retaining wall 130 and the liquid adhesive 140. The method of curing is, for example, irradiation with ultraviolet light. After the adhesive 140 is cured, it becomes a transparent adhesive.

Please refer to FIG. 9A to FIG. 9C , which are process diagrams of the bonding method of the touch panel of FIG. 3 . The following is a description of the steps of the retaining wall 230 ( FIGS. 9A to 9C ). The other steps of the bonding method of the touch panel of FIG. 3 are similar to the corresponding steps of the bonding method of the touch panel of FIG. 1 . I will not repeat them here.

As shown in Fig. 9A, the nozzle T1 forms a high retaining wall 232. For example, the nozzle T1 moves along an annular path and continuously extrudes the retaining wall material to form a high retaining wall 232. The thickness H3 of the high retaining wall 232 is proportional to the height of the nozzle T1. For example, the higher the height of the nozzle T1, the thicker the thickness H3 of the high retaining wall 232.

As shown in FIG. 9B, the height of the nozzle T1 is lowered to form a low retaining wall 231, wherein the low retaining wall 231 is connected to the high retaining wall 232. During this process, the nozzle T1 moves along the annular path and continuously extrudes the retaining wall material to form the low retaining wall 231.

As shown in FIG. 9C, the height of the nozzle T1 is raised to form another high retaining wall 232, and the other high retaining wall 232 is connected to the low retaining wall 231. The high retaining wall 232 and the low retaining wall 231 define another corresponding opening 130a.

During the formation of the retaining wall 230, the nozzle T1 can continuously extrude the retaining wall material without interruption.

The thickness of the retaining wall 230 can be determined by controlling at least one of the amount of glue discharged from the nozzle T1 and the displacement speed of the nozzle T1. The amount of glue that the nozzle T1 forms in the high retaining wall 232 may be the same as the amount of glue that forms the low retaining wall 231 (the amount of glue does not change with time) or different. When the amount of glue of the nozzle T1 is the same, the volume of the high retaining wall 232 is substantially equal to the volume of the low retaining wall 231, but the present invention is not limited. When the amount of glue of the nozzle T1 is variable (for example, changes with time or position), the volume of the high retaining wall 232 may not be equal to the volume of the low retaining wall 231; or the volume of any of the two high retaining walls 232 may be unequal; or The volume of any two low barrier walls 231 may not be equal. Further, when the amount of glue of the nozzle T1 is variable, the high retaining wall 232 of two different thicknesses may be formed, or the low retaining wall 231 of two different thicknesses may be formed.

In one embodiment, the thickness of the low barrier 231 and the high barrier 232 can be controlled by controlling the displacement speed of the nozzle T1. For example, when the displacement speed of the nozzle T1 is slower, the thickness of the retaining wall (the low retaining wall 231 and/or the high retaining wall 232) is larger.

Then, the process of Figs. 9A to 9C described above is repeated to form the retaining wall 230 of Fig. 3.

As described above, in the process of forming the retaining wall 230, the retaining wall 230 having the high and low difference structure (the high retaining wall 232 and the low retaining wall 231) can be obtained by adjusting the height position of the nozzle T1.

Please refer to FIG. 10 , which is a process diagram of a method for bonding a touch panel of FIG. 5 . The following is a description of the step (FIG. 10) of the retaining wall 330. The other steps of the bonding method of the touch panel of FIG. 3 are similar to the corresponding steps of the bonding method of the touch panel of FIG. 1 . No longer.

As shown in Fig. 10, a plurality of granular retaining walls 331 are formed. For example, the nozzle T2 sprays the retaining wall material in a spray manner to form a granular retaining wall 331. The adjacent two granular retaining walls 331 are connected to each other and define corresponding openings 130a. The retaining wall 330 having the granular retaining wall 331 can be quickly formed by the spraying method. Further, the nozzle T2 is, for example, a jet.

In this embodiment, the retaining wall material is heated to reduce its viscosity after being heated in the nozzle T2, and then the granular retaining wall 331 is ejected by the nozzle T2. Further, the retaining wall 330 can be formed by the movement of the nozzle T2. In one embodiment, the retaining wall material ejected by the nozzle T2 may have a viscosity of between 5,000 and 10,000 cps, that is, the retaining wall material may be heated in the nozzle T2 to reduce the viscosity to 5000 to 10000 cps. Spray again.

In one embodiment, the formation of a plurality of granular retaining walls 331 can also be accomplished using the nozzle T1 described above.

In the touch panel and the touch display panel using the same, the retaining wall of the touch panel has at least one opening, which can accommodate the excess portion of the adhesive to reduce or avoid overflow. In addition, the gas in the accommodating space can be discharged to the outside of the touch panel through the opening, thereby reducing or avoiding gas remaining in the accommodating space.

In conclusion, the present invention has been disclosed in the above embodiments, but it is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100, 200, 300. . . Touch panel

110. . . Induction substrate

120. . . Protective cover

121. . . Shading layer

130, 230, 330. . . Retaining wall

130a. . . Opening

131. . . Sub-retaining wall

131u, 132u. . . Upper surface

130s, 140s. . . Outer side

132. . . Separation retaining wall

140. . . Adhesive

231. . . Low barrier

232. . . High retaining wall

331. . . Granular retaining wall

331s. . . Curved sidewall

400. . . Touch display panel

410. . . Display panel

420. . . Outer frame

H1. . . Height difference

H2, H3. . . thickness

SP. . . Housing space

T1, T2. . . nozzle

W. . . width

FIG. 1A is a top view of a touch panel according to an embodiment of the invention.

Fig. 1B is a cross-sectional view taken along line 1B-1B' in Fig. 1A.

Fig. 1C is a cross-sectional view taken along line 1C-1C' in Fig. 1A.

2 is a cross-sectional view of a retaining wall in accordance with another embodiment of the present invention.

3 is a cross-sectional view of a retaining wall in accordance with yet another embodiment of the present invention.

4 is a cross-sectional view of a touch display panel in accordance with an embodiment of the invention.

5 to 8 are process diagrams showing a method of bonding the touch panel of FIG. 1 .

9A to 9C are process diagrams showing a method of bonding the touch panel of FIG. 3.

FIG. 10 is a process diagram of a method of bonding a touch panel of FIG. 5.

100. . . Touch panel

110. . . Induction substrate

120. . . Protective cover

130. . . Retaining wall

130a. . . Opening

131. . . Sub-retaining wall

131u, 132u. . . Upper surface

132. . . Separation retaining wall

140. . . Adhesive

H1. . . Height difference

SP. . . Housing space

W. . . width

Claims (13)

A touch panel includes: a sensing substrate; a protective cover; a retaining wall formed between the sensing substrate and the protective cover, the retaining wall having an opening and surrounding an receiving space; and a bonding A glue is formed in the accommodating space and adheres the sensing substrate and the protective cover. The touch panel of claim 1, wherein the retaining wall comprises: a sub-retaining wall surrounding the accommodating space; and a plurality of separating retaining walls, wherein the separating retaining walls are separately disposed in the sub-segment The retaining wall defines the opening in the adjacent two of the separating retaining wall and the sub-retaining wall. The touch panel of claim 1, wherein the retaining wall comprises: a plurality of granular retaining walls, and adjacent two of the granular retaining walls are connected to each other and define the opening. The touch panel of claim 3, wherein each of the granular retaining walls has a curved side wall, and the curved side walls of the adjacent two granular retaining walls are opposite to each other to define the opening. The touch panel of claim 1, wherein the retaining wall comprises: a plurality of high retaining walls; and a plurality of low retaining walls, each of the low retaining walls connecting adjacent two high retaining walls; wherein each The low barrier wall and the adjacent two of the high barrier walls define the opening. The touch panel of claim 1, wherein one part of the adhesive is formed in the opening. A touch display device includes: a touch panel, comprising: a sensing substrate; a protective cover; a retaining wall formed between the sensing substrate and the protective cover, the retaining wall having an opening and surrounding An accommodating space; and an adhesive glue formed in the accommodating space and bonding the sensing substrate and the protective cover; and a display panel corresponding to the touch panel configuration. A method for bonding a touch panel, comprising: providing a protective cover; forming a retaining wall on the protective cover, wherein the retaining wall has an opening and surrounding an accommodation space; forming a liquid adhesive In the accommodating space, the protective cover and the sensing substrate are formed, wherein the retaining wall is formed between the sensing substrate and the protective cover; and the protective cover and the sensing substrate after the pair is cured The retaining wall and the liquid adhesive are cured. The bonding method of claim 8, wherein the step of forming the retaining wall further comprises: pre-curing the formed retaining wall while forming the retaining wall. The bonding method of claim 8, wherein the step of forming the retaining wall further comprises: forming a sub-retaining wall, wherein the sub-retaining wall surrounds the accommodating space; and forming a plurality of separating blocks a wall, wherein the separate retaining walls are separately formed on the sub-retaining wall, and the adjacent two retaining walls and the sub-retaining wall define the opening. The bonding method of claim 8, wherein the step of forming the retaining wall further comprises: forming a plurality of granular retaining walls, wherein adjacent two of the granular retaining walls are connected to each other and defining the opening hole. The method of laminating according to claim 11, wherein the forming of the granular retaining walls is accomplished by spraying. The bonding method of claim 8, wherein in the step of forming the retaining wall, the retaining wall is formed by a nozzle, and in the step of forming the retaining wall, the step further comprises: forming the nozzle a high-grade wall; reducing the height of the nozzle to form a low retaining wall, wherein the low retaining wall is coupled to the high retaining wall; and raising the height of the nozzle to form another high retaining wall, wherein the other high retaining wall Connected to the low barrier wall; wherein the high barrier wall, the low barrier wall and the other high barrier wall define the opening.