TW201506732A - Touch device and lamination method for the touch device - Google Patents

Abstract

The present invention relates to a touch device and a lamination method for the touch device. The lamination method is to combine a LCD monitor and a touch panel with an annular adhesive material. The adhesive material is mounted between the LCD monitor and the touch panel to form a first gap between the LCD monitor and the touch panel. The LCD monitor has an optical layer mounted on a surface of the LCD monitor and surrounded by the annular adhesive material. The touch panel has an insulating layer mounted on a bottom of the touch panel, corresponding to the optical layer, and surrounded by the annular adhesive material. The touch device reduces a distance of the first gap by thicknesses of the optical layer and the insulating layer. An influence to an electric field of the touch device caused by change of the distance of the first gap when the touch device deforms can thus be reduced.

Description

Touch device and bonding method thereof

The present invention relates to a touch device and a bonding method thereof, and more particularly to a touch device bonding method that is not fully integrated, which can effectively reduce the air gap to reduce the influence of the air gap on the electric field.

The so-called bonding refers to the bonding technology between the liquid crystal module (LC) and the touch panel (TP). There are two main types of bonding technology, namely, full-face lamination and full lamination. The full-fitting technology allows the display device to have high brightness and high-quality realistic visual effects, despite the full sticker. The combination technology can make the display screen better. Although the display effect of the full-fitting technology is more advantageous, it is necessary to ensure that there is no bubble and symmetry at the time of bonding, and the cost of coating, alignment and materials is relatively high, especially The new touch display is getting bigger and bigger, which will further improve the difficulty of the full fit technology.

Compared with the full-fitting technology, the word-fitting adhesive has the advantages of simple process and low cost, mainly covering the rubber material around the liquid crystal module (such as double-sided tape, UV glue, AB glue, etc.). And the surrounding areas corresponding to the touchpad are attached to each other. In this case, whether the coating, the alignment difficulty or the material cost are relatively low, as shown in FIG. 7, the liquid crystal module 70 passes through the lip glue. When the 80 is attached to the touch panel 90, an air gap is formed between the liquid crystal module 70 and the touch panel 90, which easily causes light to refract and overlap. In addition, the display effect is not good; in addition, the change of the air gap will also affect the correctness of the capacitive touch panel detection.

Capacitive touch panel is based on the change of capacitance value The detected object will cause a change in the capacitance value of the capacitive touch panel when the user touches, thereby determining whether the touched and touched position is. Therefore, if there are other factors other than actual touch, the capacitance value will change, which will naturally affect the correctness of the detection.

The capacitance value C of the plate capacitor can be obtained by: Where ε is the dielectric constant, A is the area of the two parallel plates, and d is the distance between the two parallel plates.

Please refer to FIG. 8 , which is a graph showing the capacitance value change according to the above formula. The vertical axis is the capacitance value C and the horizontal axis is the distance d. When the distance d between the two parallel plates is larger, the capacitance value C is smaller. In addition, it also represents the greater the change in the capacitance value C as the distance d changes. Assuming that the distance d of the two parallel plates is variable, when the distance d varies between a large range of d1 and d3, the amount of change in the capacitance value is ΔC1. If the distance d varies between d1 and d2 in a small range, the amount of change ΔC2 of the capacitance value becomes relatively small. As can be seen from the curve, ΔC2 is significantly smaller than ΔC1.

The touch panel 90 and the liquid crystal module 70 of the touch device are like two parallel plates, so that the two parallel plates have a distance d and constitute an equivalent capacitance Ceq (including an equivalent mutual capacitance Cm and an equivalent self). Sense capacitance Cs). In the use of the touch device, if the touch panel 90 is touched and bent due to pressure, since the distance between the touch panel 90 and the liquid crystal module 70 is small, when the touch panel 90 is deformed, the touch The control board 90 is easily accessible to the liquid crystal The module 70, which means that the medium between the two parallel plates is changed from air to non-air medium (for example, glass and optical layer of the liquid crystal module), and the dielectric constant of the glass and air is several times different, according to the above The calculation method of the capacitance value shows that when the amount of change in the equivalent capacitance Ceq becomes large, the degree of influence on the correctness of the detection of the touch panel 90 will be expanded.

It can be seen from the above that the seal of the word glue has a simple process and a process. This low-level advantage, but the thickness of the touchpad glue is used to increase the distance between the touchpad and the liquid crystal module. Once the touchpad is bent due to the pressure, a large amplitude equivalent capacitance change will be caused, and the touchpad is enlarged. Detect the impact of correctness. Therefore, the above-mentioned non-full-fit technology touch device still needs further review and seeks a feasible solution.

Therefore, the main purpose of the present invention is to provide a touch device and The bonding method can effectively reduce the environmental variation of the touch device, and suppress the variation of the equivalent capacitance between the touch panel and the liquid crystal module when the touch panel is deformed, thereby ensuring the correctness of the touch panel detection.

The main technical means for achieving the foregoing object is that the touch device comprises: a liquid crystal module having a surface, an optical layer is disposed on the surface thereof; and an adhesive material is disposed around the liquid crystal module and located at the same The outer surface of the optical layer; and a touch panel having a bottom surface, the bottom surface of which has an insulating layer; the touch panel is correspondingly attached to the liquid crystal module through the adhesive material; wherein the insulating layer of the bottom surface of the touch panel is Corresponding to the optical layer and located inside the adhesive.

Another major technical means to achieve the aforementioned objectives The touch device is mainly provided with an adhesive material between a liquid crystal module and a touch panel for bonding to each other; wherein the adhesive material has a thickness such that the liquid crystal module and the touch panel have a first a gap; the liquid crystal module has a surface, the surface of which is provided with an optical layer; and the touch panel has a bottom surface, the bottom surface of which corresponds to the optical layer is provided with an insulating layer, the total thickness of the insulating layer and the optical layer is not greater than The first gap.

The method for bonding the touch device includes: providing a liquid crystal module having an optical layer on the surface thereof; and providing an adhesive material on the liquid crystal module The periphery of the optical layer is disposed on the periphery of the optical layer; a touch panel is provided, the bottom surface of the touch panel has an insulating layer; and the touch panel is adhered to the liquid crystal module through the adhesive material And a surface of the liquid crystal module having a first gap between the surface of the liquid crystal module and the bottom surface of the touch panel, and the total thickness of the optical layer and the insulating layer is not greater than the first gap.

The touch device and the bonding method thereof mainly cover the gap formed by the contact between the touch panel and the liquid crystal module through the adhesive layer by the insulating layer on the bottom surface of the touch panel, because the touch panel and the liquid crystal module are in the insulating layer and the optical layer thereof. The gap at the layer has been compressed as much as possible, thus effectively reducing the amount of change in its equivalent capacitance and ensuring the correctness of the touchpad detection.

10,10’‧‧‧LCD modules

100‧‧‧ surface

101‧‧‧First area

11‧‧‧Optical layer

12‧‧‧Frame

20‧‧‧ Trackpad

200‧‧‧ bottom

201‧‧‧Second area

21‧‧‧Insulation

22‧‧‧Optical adhesive

23‧‧‧Sense layer

30‧‧‧Adhesive

70‧‧‧LCD panel

80‧‧‧Words

90‧‧‧Touchpad

1 is a cross-sectional view showing a first embodiment of a touch device of the present invention.

2 is a top view of a liquid crystal module according to a first embodiment of the touch device of the present invention; Floor plan.

3 is a bottom plan view of the touch panel of the first embodiment of the touch device of the present invention.

4 is still another cross-sectional view of the first embodiment of the touch device of the present invention.

FIG. 5 is a graph showing the relationship between the equivalent capacitance value and the distance of the first embodiment of the touch device of the present invention.

Figure 6 is a cross-sectional view showing a second embodiment of the touch device of the present invention.

FIG. 7 is a schematic diagram of a touch device that is known to be fitted with a word.

Figure 8 is a graph of capacitance versus plate distance.

For the first embodiment of the touch device of the present invention, please refer to FIG. 1 , which is mainly composed of a liquid crystal module 10 , a touch panel 20 and an adhesive 30; wherein: please refer to FIG. 2 The liquid crystal module 10 has a rectangular shape and has a surface 100. The surface 100 is not completely provided with an optical layer 11 which is also rectangular. In this embodiment, the outer periphery of the surface of the liquid crystal module 10 is A first region 101 is formed between the outer periphery of the optical layer 11, and the first region 101 is in a square shape and surrounds the periphery of the optical layer 11. In the embodiment, the optical layer 11 is a polarizing plate. More specifically, the thickness of the liquid crystal module 10 is about 0.7 to 1.5 mm, and the thickness of the optical layer 11 is generally about 50 to 200 um. In the present embodiment, the thickness of the optical layer 11 is about 100 um.

As shown in FIG. 1 , the touch panel 20 has a rectangular shape and is matched in size to the liquid crystal module 10 . The touch panel 20 has a bottom surface 200 , and a sensing layer 23 is disposed on the bottom surface thereof. all covered The bottom surface 200 has a spacing between the outer periphery of the sensing layer 23 and the outer periphery of the touch panel 20. As shown in FIG. 1 and FIG. 3 , the bottom surface 200 of the touch panel 20 is provided with an insulating layer 21 having a relatively thick thickness. The insulating layer 21 is rectangular and non-uniformly disposed on the bottom surface 200 of the touch panel 20 . However, the sensing layer 23 is completely covered, and a second region 201 is formed between the outer periphery of the bottom surface 200 of the touch panel 20 and the outer periphery of the insulating layer 21. The second region 201 corresponds to the first region 101 and has a square shape. Surrounding the periphery of the insulating layer 21; in the embodiment, the insulating layer 21 is an explosion-proof film (ASF) attached to the bottom surface 200 of the touch panel 20 through an optical adhesive 22. Generally, the thickness of the touchpad mostly falls between 0.4mm and 1.3mm, and the common thickness is 0.5mm, 0.7mm or 1.1mm. In this embodiment, the thickness of the insulating layer 21 composed of the explosion-proof film is 50 um to 200 um, and the thickness of the optical adhesive 22 for adhering the rupture film is 25 to 50 um.

Referring to FIG. 1 , the adhesive 30 is sandwiched by the foregoing. Between the liquid crystal module 10 and the touch panel 20, it may be composed of double-sided tape or water glue. If it is made of double-sided tape, the thickness is 0.2mm~0.5mm, if it is water glue, it is 0.1mm or more, and it is adhesive. The material 30 is in the shape of a mouth and has a bottom surface and a top surface. The bottom surface of the material 30 is adhered to the first area 101 of the liquid crystal module 10, and the top surface of the material 30 is adhered to the second area 201 of the touch panel 20, thereby bonding. The materials 30 are respectively located on the periphery of the optical layer 11 and the insulating layer 21 to form a herringbone type distribution. Further, the outer peripheral edges of the optical layer 11 and the insulating layer 21 and the inner edge of the adhesive material 30 respectively have a pitch, that is, The adhesive material 30 does not overlap with the optical layer 11 on the liquid crystal module 10 and the insulating layer 21 on the touch panel 20.

The bonding method of the touch device is mainly in the liquid crystal mode An adhesive 30 is disposed around the group 10. For the foregoing embodiment, the periphery of the liquid crystal module 10 refers to the first region 101 between the outer periphery of the surface 100 and the outer periphery of the optical layer 11. Next, the bottom surface 200 The touch panel 20 provided with the insulating layer 21 is oppositely disposed on the liquid crystal module 10, and is bonded to the top surface of the adhesive 30 by the second region 201 between the outer periphery of the bottom surface 200 and the outer periphery of the insulating layer 21.

After bonding, the optical layer 11 on the surface of the liquid crystal module 10 The insulating layer 21 corresponds to the bottom surface of the touch panel 20. As shown in FIG. 4 , since the liquid crystal module 10 is adhered to the touch panel 20 through the adhesive 30 , a height equal to the thickness of the adhesive 30 is formed between the liquid crystal module 10 and the touch panel 20 . A gap G1. The optical layer 11 is provided on the surface of the liquid crystal module 10, and the bottom surface of the touch panel 20 has an insulating layer 21 and does not overlap with the adhesive material 30. Therefore, the liquid crystal module 10 and the touch panel 20 are in the optical layer 11 and the insulating layer. A second gap G2 will be formed at the opposite portion of the 12, the second gap G2 will be much smaller than the first gap G1, and the second gap G2 is mainly composed of the sum of the thickness of the insulating layer 21 (or the optical adhesive 22) and the optical layer 11. It is determined that the total thickness of the insulating layer 21 (or the optical adhesive 22) and the optical layer 11 is not greater than the first gap G1 described above, but may be equal to the first gap G1, that is, ideally, the so-called second gap G2 may be Zero (so-called "ideal" means that the thickness tolerance of the layered material such as the adhesive 30, the optical layer 11, the insulating layer 21 or the optical adhesive 22 is not considered).

It can be seen from the above that the touch device of the present invention and its bonding party The method mainly comprises the fact that the insulating layer 21 on the bottom surface of the touch panel 20 cooperates with the optical layer 11 on the surface of the liquid crystal module 10 to fill the first gap G1 between the touch panel 20 and the liquid crystal module 10, so that the optical layer 11 can be extremely close. Insulation layer 21, even In the ideal without tolerance, it can be closely attached to each other to achieve the purpose of no gap. In other words, the second gap G2 of the touch panel 20 and the liquid crystal module 10 at the insulating layer 21 and the optical layer 11 has been compressed as much as possible, or even zero. When the distance between the touch panel 20 and the liquid crystal module 10 is effectively reduced, when the touch panel 20 is deformed by pressure, it is limited by the reduction of the deformable space, so that the variation of the equivalent capacitance will be This can be greatly reduced to effectively reduce the impact on the correctness of the touch panel detection.

Please refer to FIG. 5 , which is a graph showing the relationship between the equivalent capacitance of the touch device and the gap between the touch panel 20 and the liquid crystal module 10 , wherein the vertical axis is the equivalent capacitance value Ceq and the horizontal axis is the touch. A gap G between the board 20 and the liquid crystal module 10. It can be seen from the curve that the equivalent capacitance value Ceq varies with the gap G of the touch panel 20 and the liquid crystal module 10, and the gap between the touch panel 20 and the liquid crystal module 10 is generated by the thickness of the adhesive material 30. When a gap G1 is used, the equivalent capacitance value Ceq is small, and when the gap between the touch panel 20 and the liquid crystal module 10 is the second gap G2 formed by filling the first gap G1 by the insulating layer 21, the equivalent is The capacitance value Ceq becomes large. The leftmost side of the horizontal axis of the curve indicates the gap G2' and its relative equivalent capacitance value Ceq once the touchpad 20 is pressed to the bottom, wherein the gap G2' is close to zero or equal to zero. It can be clearly seen from the curve that if the touch panel 20 is pressed to the bottom in the first gap G1, the variation ΔC _{G1 of} the equivalent capacitance value Ceq is very large; however, if the touch panel 20 is after compression When the second gap G2 is pressed to the bottom, the variation ΔC _G2 of the equivalent capacitance value Ceq becomes very small, compared with the equivalent capacitance value Ceq variation ΔC _G1 at the first gap _G1 , etc. The amount of change ΔC _{G2 of the} effective capacitance value Ceq can be reduced by several times.

As can be seen from the above, when the touch panel 20 and the liquid crystal module 10 The smaller the gap, the smaller the amount of deformation of the touch panel 20 due to compression and deformation, and the smaller the variation of the equivalent capacitance value, and the smaller the influence on the detection accuracy of the touch panel 20, By using the invention, the gap between the touch panel 20 and the liquid crystal module 10 can be minimized, and the gap can be made zero without considering the tolerance, that is, the influence of the variation of the equivalent capacitance value can be almost completely eliminated.

Furthermore, even between the touch panel 20 and the liquid crystal module 10 The second gap G2 is not zero, and when the touch panel 20 is deformed, the medium between the touch panel 20 and the liquid crystal module 10 may still be changed from air to glass and optical layer 11, and the dielectric constant is increased several times, but The invention can compress the second gap G2 as much as possible, so that the variation of the equivalent capacitance value Ceq when the touch panel 20 is deformed is reduced by several times, so that the correctness of the touch panel 20 is detected as a whole due to the change of the equivalent capacitance value. The impact is still being significantly and effectively reduced.

Regarding the second embodiment of the touch device of the present invention, please refer to As shown in FIG. 6 , the basic structure is the same as that of the first embodiment, and is mainly composed of a liquid crystal module 10 ′, a touch panel 20 and an adhesive 30. The surface of the liquid crystal module 10 is provided with an optical layer 11 . The adhesive material 30 is disposed around the liquid crystal module 10 and is located at the periphery of the optical layer 11 . The bottom surface of the touch panel 20 is provided with an insulating layer 21 , and the touch panel 20 is correspondingly adhered to the liquid crystal through the adhesive material 30 . The insulating layer 21 on the bottom surface of the touch panel 20 is opposite to the optical layer 11 and located inside the bonding material 30.

The difference from the first embodiment is that the adhesive material 30 is not It is bonded to the surface of the liquid crystal module 10'. In this embodiment, the surrounding ring of the liquid crystal module 10' is provided with a frame 12 which is in the shape of a mouth and is not higher than the surface of the liquid crystal module 10'. The adhesive material 30 is correspondingly disposed on the frame. 12 on. Since the frame 12 is not higher than the surface of the liquid crystal module 10', the optical layer 11 disposed on the surface of the liquid crystal module 10' will protrude beyond the frame 12, and the insulating layer 21 on the bottom surface of the touch panel 20 is used to compress the touch panel. The gap between the 20 and the liquid crystal module 10.

In summary, the present invention mainly uses the insulating layer on the bottom surface of the touch panel to fill the gap between the touch panel and the liquid crystal module, so as to compress the gap between the touch panel and the liquid crystal module at the insulating layer and the optical layer as much as possible. The touch panel can be as close as possible to the liquid crystal module, so the variation of the equivalent capacitance can be effectively reduced to ensure the correctness of the touch panel detection. On the other hand, the isolation between the touch panel and the liquid crystal module due to the insulation layer and the optical layer ensures that the touch panel and the liquid crystal module maintain a considerable distance without interference.

10‧‧‧LCD Module

101‧‧‧First area

11‧‧‧Optical layer

20‧‧‧ Trackpad

201‧‧‧Second area

21‧‧‧Insulation

22‧‧‧Optical adhesive

23‧‧‧Sense layer

30‧‧‧Adhesive

Claims (17)

A touch device includes: a liquid crystal module having a surface having an optical layer on a surface thereof; an adhesive material, a ring disposed around the liquid crystal module and located at an outer periphery of the optical layer; and a touch panel The bottom surface of the touch panel has an insulating layer corresponding to the optical layer and is located inside the adhesive material. The touch device of claim 1, wherein a first region is formed between the outer periphery of the optical layer on the outer periphery of the surface of the liquid crystal module; an outer periphery of the bottom surface of the touch panel and an outer periphery of the insulating layer Forming a second region opposite to the first region; the adhesive material is disposed in the first and second regions such that the optical layer and the insulating layer are located on the inner side of the adhesive material without overlapping. In the touch device of claim 1, the surrounding ring of the liquid crystal module is provided with a frame, and the adhesive material is correspondingly disposed on the frame, and the frame is not higher than the surface of the liquid crystal module. The touch device of any one of claims 1 to 3, wherein the insulating layer is an explosion-proof film and is adhered to the bottom surface of the touch panel through an optical adhesive. The touch device of claim 1, wherein the optical layer is a polarizing plate. A touch device is mainly provided with an adhesive material between a liquid crystal module and a touch panel for bonding to each other; wherein the adhesive material has a thickness such that the liquid crystal module and the touch panel have a first a gap; the liquid crystal module has a surface having an optical layer on a surface thereof; The touch panel has a bottom surface, and a bottom surface of the touch panel is provided with an insulating layer, wherein the sum of the thickness of the insulating layer and the optical layer is not greater than the first gap. The touch device of claim 6, wherein the adhesive has a thickness of 0.2 to 0.5 mm. The touch device of claim 7, wherein the insulating layer has a thickness of 50 to 200 um. The touch device of claim 8, wherein the insulating layer is adhered to the bottom surface of the touch panel through an optical adhesive, and the optical adhesive has a thickness of 25 to 50 um. The touch device of claim 9, wherein the optical layer has a thickness of 50 to 200 um. The touch device of any one of claims 6 to 10, wherein the first gap is less than 20 um. The touch device of any one of claims 6 to 10, wherein a first region is formed between the outer periphery of the optical layer on the outer periphery of the surface of the liquid crystal module; the outer periphery of the bottom surface of the touch panel is insulated from the outer periphery Forming a second region between the outer peripheral edges of the layer, the second region is opposite to the first region; the adhesive material is disposed in the first and second regions, so that the optical layer and the insulating layer are located on the adhesive layer without overlapping The inside of the material. A method for attaching a touch device includes: providing a liquid crystal module having an optical layer on a surface thereof; and disposing an adhesive material around the liquid crystal module to position the adhesive material on the optical layer a touch panel, the bottom surface of the touch panel is attached with an insulating layer; And the touch panel is attached to the surface of the liquid crystal module through the adhesive material, and the insulating layer is located inside the adhesive material, wherein the surface of the liquid crystal module and the bottom surface of the touch panel have a first a gap, and a sum of thicknesses of the optical layer and the insulating layer is not greater than the first gap. The bonding method of the touch device of claim 13, wherein the insulating layer is an explosion-proof film, and the explosion-proof film is attached to the bottom surface of the touch panel through an optical adhesive. The bonding method of the touch device according to claim 13, wherein the optical layer on the surface of the liquid crystal module is a polarizing plate. The method of attaching the touch device according to any one of claims 13 to 15, wherein the outer periphery of the surface of the liquid crystal module has a first region between outer peripheral edges of the optical layer; A second region is formed between the outer periphery and the outer periphery of the insulating layer, and the second region is opposed to the first region; the adhesive is disposed in the first and second regions. The bonding method of the touch device of claim 16, wherein the inner edge of the adhesive material has a spacing between the outer periphery of the optical layer and the outer periphery of the insulating layer.