TWI689854B - Touch display panel and method for making same - Google Patents

Abstract

A touch display panel includes a cover plate, a display module, a flexible substrate, a first touch layer, a first circuit layer, and an adhesive layer. The display module is located on one side of the cover plate. The flexible substrate includes a main portion between the cover plate and the display module, and a bent portion extending from the main portion and beyond the display module. The bent portion at least partially covers the display module. The first touch layer is on a surface of the main portion. The first circuit layer is on a surface of the bent portion and electrically connected to the first touch layer. A gap is between the first circuit layer and the cover plate. The adhesive layer covers the side of the first circuit layer away from the flexible substrate and fills the gap. A method for making the touch display panel is also provided. In this disclosure, the adhesive layer completely fills the gap between the first circuit layer and the cover plate, so the reliability is good.

Description

Touch display panel and manufacturing method thereof

The invention relates to the field of display technology, in particular to a touch display panel and a manufacturing method thereof.

The conventional touch display panel includes a stacked touch module and a display module. The touch module includes a touch layer and a circuit layer electrically connected to the touch layer. The conventional preparation method of the touch display panel includes: stacking display modules and touch layers on top and bottom; setting an adhesive layer on the circuit layer of the touch module; ultraviolet curing adhesive layer; bending the circuit layer to make Cover the side of the display module. However, in this way, there is a risk of cracking of the adhesive layer during bending, and there is a gap between the adhesive layer and the cover plate after bending, and the reliability is poor.

The invention provides a touch display panel, which comprises: a cover plate; a display module, which is located on one side of the cover plate; A flexible substrate including a main body portion between the cover plate and the display module and a bent portion connecting the main body portion and extending beyond the display module, the bent portion being formed by the main body portion The bending extends and at least partially covers the display module; the first touch layer is disposed on a surface of the body portion; the first circuit layer is disposed on a surface of the bending portion and is electrically connected to the The first touch layer has a gap between the first circuit layer and the cover plate; and the adhesive layer covers the side of the first circuit layer away from the flexible substrate and fills the gap.

The present invention also provides a method for manufacturing a touch display panel, which includes the following steps: Step S1: providing a flexible substrate and a display module, the flexible substrate including a body portion and an extension approximately equal in size to the display module Beyond the bending part of the display module; step S2: forming a touch layer on the main body part, forming a circuit layer electrically connected to the touch layer on the bending part; step S3: providing a A cover plate, bonding the cover plate to the side of the main body where the touch layer is formed, and after the bonding, there is a gap between the circuit layer and the cover plate; step S4: the display The module is bonded to the side of the main body away from the cover plate; step S5: bending the flexible substrate so that the bent portion covers the display module; step S6: at the circuit layer An adhesive layer is formed on a side away from the flexible substrate, and the adhesive layer completely fills the gap.

In the touch display panel and the manufacturing method thereof provided by the embodiments of the present invention, the adhesive layer completely fills the gap between the first circuit layer and the cover plate, and the reliability is good.

100, 200, 300, 400: touch display panel

101: display area

102: Non-display area

10: Cover

20: The first transparent insulating layer

31: Flexible substrate

311: Main body

312: Bending

32: The first touch layer

33: the first circuit layer

34: Second touch layer

35: Second circuit layer

40: Second transparent insulating layer

50: display module

51: The first surface

52: Second surface

53: Side

60: Adhesive layer

61: Part One

62: Part Two

63: Part Three

64: Part Four

70: clearance

FIG. 1 is a schematic plan view of a touch display panel provided by a first embodiment of the invention.

2 is a schematic cross-sectional view of FIG. 1 taken along section line II-II.

3 is a schematic cross-sectional view of a touch display panel provided by a second embodiment of the invention.

4 is a schematic cross-sectional view of a touch display panel provided by a third embodiment of the present invention.

5 is a schematic cross-sectional view of a touch display panel according to a fourth embodiment of the invention.

6 is a flowchart of a method for manufacturing a touch display panel according to an embodiment of the invention.

First embodiment

Please refer to FIG. 1, which is a schematic plan view of a touch display panel 100 according to a first embodiment of the present invention. The touch display panel 100 has a display area 101 and a non-display area 102 surrounding the display area 101.

Please refer to FIG. 2, which is a schematic cross-sectional view of FIG. 1 taken along section line II-II. The touch display panel 100 includes a cover 10, a display module 50, a flexible substrate 31, a first touch layer 32, and a first circuit layer 33.

In this embodiment, the material of the cover plate 10 is glass, such as soda glass, aluminosilicate glass, alkali-free glass, and the like. In other embodiments, the material of the cover plate 10 can also be transparent plastic, acrylic, or any other material with a certain degree of light transmittance that can protect the structure that fits it.

The display module 50 is located on one side of the cover plate 10 and corresponds to the display area 101. The display module 50 has a first surface 51 close to the cover plate 10, a second surface 52 opposite to the first surface 51, and a side surface 53 connecting the first surface 51 and the second surface 52. In this embodiment, the display module 50 is a liquid crystal display Module. In other embodiments, the display module 50 may also be, but not limited to, a micro LED (Light Emitting Diode) display module or an OLED (Organic Light Emitting Diode) display module.

The flexible substrate 31 includes a body portion 311 between the cover plate 10 and the display module 50 and a bent portion 312 connecting the body portion 311 and extending beyond the display module 50. The main body portion 311 is approximately the same size as the display module 50. The bending portion 312 extends from the main body portion 311 to the display module 50 side and at least partially covers the side surface 53 of the display module 50. In this embodiment, the flexible substrate 31 is a flexible flexible substrate, and its material may be polyethylene terephthalate (Poly Ethylene Terephthalate, PET) or thermoplastic material.

The first touch layer 32 is located on the surface of the main body 311 close to the cover 10. In order not to affect the display effect, the first touch layer 32 is light-transmissive, and its material may be metal mesh (Metal Mesh), indium tin oxide (ITO), carbon nanotube (Carbon Nanotube) Or Nano Silver Wire (Nano Silver Wire) and other conductive materials.

In this embodiment, the touch display panel 100 further includes a first transparent insulating layer 20 between the cover plate 10 and the first touch layer 32. The first touch layer 32 is adhered to the cover plate 10 through the first transparent insulating layer 20. In one embodiment, the material of the first transparent insulating layer 20 may be, but not limited to, optical clear adhesive (Optical Clear Adhesive, OCA) or liquid optical clear adhesive (LOCA) with high light transmittance The adhesive will not affect the display effect.

In one embodiment, the first touch layer 32 includes a plurality of spaced-apart multiple touch electrodes (not shown) formed in a pattern, and the multiple touch electrodes form a single-layer self-capacitive touch sensing structure. When a conductive object (such as a finger) touches on the cover plate 10, the capacitance sensing signal in the area is different. The capacitance sensing signal is processed and converted to obtain the relative position of the touch point.

In another embodiment, the first touch layer 32 includes a plurality of patterned touch electrodes (not shown), and the plurality of touch electrodes form a single-layer mutual-capacitive touch sensing structure. When a conductive object (such as a finger) touches on the cover plate 10, the capacitance sensing signal in the area is different. The capacitance sensing signal is processed and converted to obtain the relative position of the touch point.

The first circuit layer 33 is located on the surface of the bent portion 312 away from the display module 50 and is electrically connected to the first touch layer 32. The first circuit layer 33 is provided corresponding to the non-display area 102. There is a gap 70 between the first circuit layer 33 and the cover 10. The material of the first circuit layer 33 can be metal mesh (Metal Mesh), indium tin oxide (ITO), carbon nanotube (Carbon Nanotube), nano silver wire (Nano Silver Wire), copper, etc. Conductive materials, etc.

The touch display panel 100 further includes a second transparent insulating layer 40 between the main body 311 and the display module 50. The display module 50 is adhered to the main body 311 of the flexible substrate 31 by the second transparent insulating layer 40. In one embodiment, the material of the second transparent insulating layer 40 may be, but not limited to, optical clear adhesive (Optical Clear Adhesive, OCA) or liquid optical clear adhesive (LOCA), etc., having high light transmittance The adhesive will not affect the display effect.

The touch display panel 100 further includes an adhesive layer 60 that completely fills the gap 70 and bends and extends to cover the side of the first circuit layer 33 away from the flexible substrate 31. The thickness of the first touch layer 32 is greater than the thickness of the first circuit layer 33. The adhesive layer 60 is in contact with the first touch layer 32, the cover plate 10 and the first transparent insulating layer 20. The adhesive layer 60 includes a first portion 61 that completely fills the gap 70 and a second portion 62 that is vertically connected to the first portion 61 and extends in the direction of the side surface 53 of the display module 50. The bent portion 312 and the first circuit layer 33 are bent and extended to cover the side surface 53 of the display module 50.

In one embodiment, the material of the adhesive layer 60 may be, but not limited to, polyurethane (Polyurethane, PU), acrylic (Acrylic), or silicone (Silicon).

In this embodiment, the bent portion 312 and the first circuit layer 33 are bent and extended to cover the side surface 53 of the display module 50, and the adhesive layer 60 on the side of the first circuit layer 33 away from the flexible substrate 31 is completely completed by the adhesive layer 60 Covering can prevent the first circuit layer 33 from being accidentally crushed or bumped during subsequent assembly or handling. In addition, the adhesive layer 60 completely fills the gap 70 between the first circuit layer 33 and the cover plate 10.

Second embodiment

Please refer to FIG. 3, which is a schematic cross-sectional view of a touch display panel 200 according to a second embodiment of the present invention. The touch display panel 200 is basically the same as the touch display panel 100 of the first embodiment of the present invention, and includes a cover plate 10, a display module 50, a flexible substrate 31, a first touch layer 32, a first circuit layer 33 and Adhesive layer 60. The display module 50 is located on one side of the cover 10. The flexible substrate 31 includes a body portion 311 between the cover plate 10 and the display module 50 and a bent portion 312 connecting the body portion 311 and extending beyond the display module 50. The main body portion 311 is approximately the same size as the display module 50. The bending portion 312 extends from the main body portion 311 to the display module 50 side and at least partially covers the side surface 53 of the display module 50. The first touch layer 32 is located on the surface of the main body 311 close to the cover 10. The first circuit layer 33 is located on the surface of the bent portion 312 away from the display module 50 and is electrically connected to the first touch layer 32. There is a gap 70 between the first circuit layer 33 and the cover 10. The adhesive layer 60 covers the side of the first circuit layer 33 away from the flexible substrate 31 and completely fills the gap 70.

The difference between the touch display panel 200 and the touch display panel 100 according to the first embodiment of the present invention is that in the first embodiment, the bent portion 312 and the first circuit layer 33 are bent and extended to cover the side surface 53 of the display module 50, The adhesive layer 60 includes a first portion 61 that completely fills the gap 70 and a second portion 62 that is vertically connected to the first portion 61 and extends in the direction of the side surface 53 of the display module 50; in this embodiment, the bent portion 312 and the second After a circuit layer 33 is bent and extended along the side surface 53 of the display module 50, it is folded back to the side of the display module 50 away from the cover plate 10 again, and the second surface 52 of the display module 50 is covered with the circuit layer. glue The adhesive layer 60 further includes a third portion 63 connected to the second portion 62 and a third portion 63 connected, and covering the fourth portion of the second surface 52 of the display module 50 extending in a direction perpendicular to the side 53 of the display module 50 64. The thickness of the adhesive layer 60 is defined as a dimension perpendicular to its extending direction. The thickness W3 of the fourth portion 64 is greater than the thickness W1 of the second portion 62, and the thickness W3 of the fourth portion 64 is greater than the thickness W2 of the third portion 63.

Third embodiment

Please refer to FIG. 4, which is a schematic cross-sectional view of a touch display panel 300 according to a third embodiment of the present invention. The touch display panel 300 is basically the same as the touch display panel 100 of the first embodiment of the present invention, and includes a cover plate 10, a display module 50, a flexible substrate 31, a first touch layer 32, a first circuit layer 33 and Adhesive layer 60. The display module 50 is located on one side of the cover 10. The flexible substrate 31 includes a body portion 311 between the cover plate 10 and the display module 50 and a bent portion 312 connecting the body portion 311 and extending beyond the display module 50. The main body portion 311 is approximately the same size as the display module 50. The bending portion 312 extends from the main body portion 311 to the display module 50 side and at least partially covers the side surface 53 of the display module 50. The first touch layer 32 is located on the surface of the main body 311 close to the cover 10. The first circuit layer 33 is located on the surface of the bent portion 312 away from the display module 50 and is electrically connected to the first touch layer 32. There is a gap 70 between the first circuit layer 33 and the cover 10. The adhesive layer 60 covers the side of the first circuit layer 33 away from the flexible substrate 31 and completely fills the gap 70.

The difference between the touch display panel 300 and the touch display panel 100 of the first embodiment of the present invention is that in the first embodiment, the touch display panel 100 includes a first touch layer 32 and an electrical connection to the first touch layer 32 The first circuit layer 33, wherein the first touch layer 32 includes a plurality of patterned touch electrodes, the plurality of touch electrodes form a single layer self-capacitance sensing structure or the plurality of touch electrodes form a single layer mutual capacitance sensing Structure; and in this embodiment, the touch display panel 100 in addition to the first touch layer 32 and electrically connected to the first In addition to the first circuit layer 33 of the touch layer 32, a second touch layer 34 and a second circuit layer 35 electrically connected to the second touch layer 34 are also included. The second touch layer 34 is located on the surface of the main body 311 away from the cover plate 10 corresponding to the display area 101. The second circuit layer 35 is located on the surface of the bent portion 312 close to the display module 50 corresponding to the non-display area 102. The first touch layer 32 includes a plurality of patterned first electrodes (not shown), the second touch layer 34 includes a patterned plurality of second electrodes (not shown), the first electrode and the second electrode To determine the location of the touch point. The plurality of first electrodes may be touch driving electrodes, and the plurality of second electrodes may be touch sensing electrodes; or the plurality of first electrodes may be touch sensing electrodes, and the plurality of second electrodes are touch driving electrodes. In this embodiment, the plurality of first electrodes and the plurality of second electrodes form a mutual capacitive touch sensing structure. When a touch occurs, the capacitive coupling between the first electrode and the second electrode corresponding to the touch point will be Affected, the induced signal (such as voltage value) related to mutual capacitance changes, and then the coordinates of each touch point can be calculated.

Fourth embodiment

Please refer to FIG. 5, which is a schematic cross-sectional view of a touch display panel 400 according to a fourth embodiment of the present invention. The touch display panel 400 is basically the same as the touch display panel 100 of the third embodiment of the present invention, and includes a cover 10, a display module 50, a flexible substrate 31, a first touch layer 32, a first circuit layer 33, and Adhesive layer 60. The display module 50 is located on one side of the cover 10. The flexible substrate 31 includes a body portion 311 between the cover plate 10 and the display module 50 and a bent portion 312 connecting the body portion 311 and extending beyond the display module 50. The main body portion 311 corresponds to the size of the display module 50. The bending portion 312 extends from the main body portion 311 toward the display module 50 and at least partially covers the side surface 53 of the display module 50. The first touch layer 32 is located on the surface of the main body 311 close to the cover 10. The first circuit layer 33 is located on the surface of the bent portion 312 away from the display module 50 and is electrically connected to the first touch layer 32. The first circuit layer 33 and the cover 10 have There is a gap 70. The adhesive layer 60 covers the side of the first circuit layer 33 away from the flexible substrate 31 and completely fills the gap 70.

The difference between the touch display panel 400 and the touch display panel 100 according to the third embodiment of the present invention is that in the third embodiment, the bent portion 312 and the first circuit layer 33 are bent and extended to cover the side surface 53 of the display module 50, The adhesive layer 60 includes a first portion 61 that completely fills the gap 70 and a second portion 62 that is vertically connected to the first portion 61 and extends in the direction of the side surface 53 of the display module 50; in this embodiment, the bent portion 312 and the second After a circuit layer 33 is bent and extends along the side 53 of the display module 50, it is bent again to the side of the display module 50 away from the cover plate 10, and the second surface 52 of the display module 50 is covered with a circuit layer and an adhesive layer 60 further includes a third portion 63 connected to the second portion 62 and a third portion 63 connected to the third portion 63, and covering a fourth portion 64 extending in a direction perpendicular to the side 53 of the display module 50 to cover the second surface 52 of the display module 50. The thickness of the adhesive layer 60 is defined as a dimension perpendicular to its extending direction. The thickness W3 of the fourth portion 64 is greater than the thickness W1 of the second portion 62, and the thickness W3 of the fourth portion 64 is greater than the thickness W2 of the third portion 63.

Please refer to FIG. 6, which is a flowchart of a method for manufacturing the touch display panel 100 according to an embodiment of the present invention. The manufacturing method of the touch display panel 100 includes the following steps S1-S6.

Step S1: Provide a flexible substrate 31 and a display module 50. The flexible substrate 31 includes a body portion 311 corresponding to the size of the display module 50 and a bent portion 312 extending beyond the display module 50.

Step S2: forming a touch layer on the body portion 311 and forming a circuit layer on the bending portion 312 electrically connected to the touch layer.

In one embodiment, step S2 may include the following steps: by a chemical vapor deposition (CVD) process, a sputter coating process, a roll-to-roll process (Roll to Roll), or a low temperature coating process A conductive layer is formed on one surface of the flexible substrate 31, and then After that, a touch layer is formed on the main body 311 by patterning the conductive layer, and a circuit layer electrically connected to the touch layer is formed on the bending part 312.

In another embodiment, the touch layer and the circuit layer can also be patterned separately.

In another embodiment, step S2 may include the following steps: by chemical vapor deposition (Chemical Vapor Deposition, CVD) process, sputter coating (Sputter) process, roll to roll process (Roll to Roll) or low temperature coating, etc. The first conductive layer is formed on a surface of the flexible substrate 31, and then the first touch layer 32 is formed on the body portion 311 by patterning the first conductive layer, and the electrical connection is formed on the bending portion 312 A first circuit layer 33 of a touch layer 32; similarly, by chemical vapor deposition (Chemical Vapor Deposition, CVD) process, sputter coating (Sputter) process, roll to roll process (Roll to Roll) or low temperature coating The second conductive layer is formed on the other surface of the flexible substrate 31 by other processes, and then the second touch layer 34 is formed on the body portion 311 by patterning the second conductive layer to form electrical properties on the bent portion 312 The second circuit layer 35 connected to the second touch layer 34.

Step S3: providing a cover plate 10, and bonding the cover plate 10 to the side of the main body 311 where the touch layer is formed, and after the bonding, there is a gap 70 between the circuit layer and the cover plate 10.

In an embodiment, in step S3, the cover plate 10 and the touch layer are bonded by a transparent insulating adhesive layer.

Step S4: bonding the display module 50 and the main body 311 away from the cover 10.

In one embodiment, in step S4, the display module 50 and the body portion 311 are bonded to each other by a transparent insulating adhesive layer on the side away from the cover plate 10.

Step S5: Bend the flexible substrate 31 so that the bent portion 312 covers the display module 50.

In an embodiment, in step S5, bending the flexible substrate 31 specifically bends the flexible substrate 31 along the junction of the bending portion 312 and the main body portion 311; the bending portion 312 bends and extends to cover the side surface 53 of the display module 50 .

In another embodiment, in step S5, bending the flexible substrate 31 specifically bends the flexible substrate 31 along the junction of the bending portion 312 and the main body portion 311; the bending portion 312 bends and extends to cover the side of the display module 50 53. Bend and extend to cover the side of the display module 50 away from the cover plate 10.

Step S6: An adhesive layer 60 is formed on the side of the circuit layer away from the flexible substrate 31, and the adhesive layer 60 completely fills the gap 70.

In one embodiment, in step S6, the adhesive layer 60 includes a first portion 61 that completely fills the gap 70 and a second portion 62 that is vertically connected to the first portion 61 and extends in the direction of the side surface 53 of the display module 50.

In another embodiment, in step S6, the adhesive layer 60 further includes a third portion 63 connected to the second portion 62 and a fourth portion connected to the third portion 63 and extending in a direction perpendicular to the side 53 of the display module 50 64.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical solution of the present invention.

400: touch display panel

101: display area

102: Non-display area

10: Cover

20: The first transparent insulating layer

31: Flexible substrate

311: Main body

312: Bending

32: The first touch layer

33: the first circuit layer

34: Second touch layer

35: Second circuit layer

40: Second transparent insulating layer

50: display module

51: The first surface

52: Second surface

53: Side

60: Adhesive layer

61: Part One

62: Part Two

63: Part Three

64: Part Four

70: clearance

Claims (9)

A touch display panel, the improvement of which includes: a cover; a display module, located on one side of the cover; a flexible substrate, which includes a main body between the cover and the display module, and A bending portion connected to the main body portion and extending beyond the display module, the bending portion is bent and extended by the main body portion and at least partially covers the display module; the first touch layer is provided on the A surface of the main body portion; a first circuit layer disposed on a surface of the bending portion and electrically connected to the first touch layer, a gap between the first circuit layer and the cover plate And an adhesive layer covering the side of the first circuit layer away from the flexible substrate and filling the gap; wherein the thickness of the first touch layer is greater than the thickness of the first circuit layer, The adhesive layer is in contact with the first touch layer in the gap. The touch display panel according to claim 1, wherein the adhesive layer at least partially covers a side of the display module away from the cover plate. The touch display panel according to claim 2, wherein the thickness of the adhesive layer is defined as a dimension perpendicular to its extending direction, and the adhesive layer is located on a side of the display module away from the cover plate The thickness of the side portion is greater than the thickness of the portion of the adhesive layer extending along the side direction of the display module. The touch display panel according to claim 1, wherein the bending portion bends and extends to cover the side of the display module, and bends and extends to cover the side of the display module away from the cover plate. The touch display panel according to claim 1, further comprising: A second touch layer located on the surface of the main body part away from the cover plate; and a second circuit layer located on the surface of the bent part close to the display module and electrically connected to the second touch layer . The touch display panel according to claim 1, further comprising a transparent insulating layer between the cover plate and the first touch layer. A method for manufacturing a touch display panel, including the following steps; Step S1: providing a flexible substrate and a display module, the flexible substrate including a main body portion of the same size as the display module and extending beyond the display module Set of bending parts; step S2: forming a touch layer on the body part, forming a circuit layer on the bending part electrically connected to the touch layer; step S3: providing a cover plate The cover plate is bonded to the side of the main body where the touch layer is formed, and after the bonding, there is a gap between the circuit layer and the cover plate; Step S4: the display module and the The side of the main body part away from the cover plate is bonded; Step S5: bending the flexible substrate so that the bent part covers the display module; Step S6: away from the flexible substrate at the circuit layer An adhesive layer is formed on one side, the adhesive layer completely fills the gap, wherein the thickness of the touch layer is greater than the thickness of the circuit layer, in the gap between the adhesive layer and the touch Control layer contact. The manufacturing method according to claim 7, wherein in step S5, bending the flexible substrate includes bending the flexible substrate along a junction of the bent portion and the main body portion. The manufacturing method according to claim 7, wherein in step S5, bending the flexible substrate includes covering the side of the display module away from the cover plate with the bent portion.

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