TWI529595B - Touch display panel - Google Patents

Description

Touch display panel

The invention relates to a touch display panel.

With the advancement of technology, various information devices continue to evolve, such as mobile phones, tablets, ultra-thin notebooks, and satellite navigation. In addition to keyboard or mouse input or manipulation, the use of touch technology to manipulate information devices is a fairly intuitive and popular way to manipulate. Among them, the touch display panel has a user-friendly and intuitive input operation interface, so that users of any age can directly select or manipulate information devices with a finger or a stylus, and thus are increasingly favored by the market.

The conventional touch display panel structure can be roughly divided into a touch panel and a display panel. The touch panel has a protection substrate and a sensing substrate, which are respectively formed with sensing electrode layers. In the fabrication, the protective substrate must be attached to the sensing substrate to form a touch panel, and then the touch panel is attached to the display panel to complete the production of the touch display panel.

Since the touch panel and the display panel are separately formed and then attached together, a touch adhesive layer is disposed between the touch panel and the display panel, and the touch panel is entirely located outside the display panel, so that the touch display panel The overall thickness is thicker, and runs counter to the lightness pursued by today's information equipment.

Therefore, how to provide a touch display panel with simple structure and light weight has become one of the important topics.

In view of the above problems, an object of the present invention is to provide a touch display panel that is simple in structure and light in weight.

To achieve the above objective, a touch display panel according to the present invention includes a substrate, a display module, a polarizer, a first touch electrode structure, and a second touch electrode junction. Structure. The substrate has light transmissivity. The display module is disposed opposite to the substrate. The polarizer is disposed between the substrate and the display module. The first touch electrode structure is disposed on the substrate and located between the substrate and the polarizer. The second touch electrode structure is disposed on the polarizer.

In an embodiment, the second touch electrode structure may be located between the polarizer and the display module.

In an embodiment, a glue layer may be disposed between the first touch electrode structure and the polarizer.

In an embodiment, a glue layer may be disposed between the second touch electrode structure and the display module.

In an embodiment, the second touch electrode structure may be located between the substrate and the polarizer.

In an embodiment, a glue layer may be disposed between the first touch electrode structure and the second touch electrode structure.

In an embodiment, a glue layer may be disposed between the polarizer and the display module.

In an embodiment, the first touch electrode structure and the second touch electrode structure may respectively comprise a metal nanowire, a transparent conductive film or a metal mesh.

In an embodiment, at least one shielding layer may be disposed on the substrate, and the shielding layer is located in a peripheral region of the substrate.

In one embodiment, the touch display panel may further include an outer polarizer disposed on the other side of the substrate relative to the display module.

In an embodiment, the substrate may be an outer polarizer and have the same structure as the polarizer.

As described above, the touch display panel of the present invention can save the use of the substrate by providing the touch electrode structure on the polarizer, thereby reducing the weight and thickness of the touch display panel. In addition, when the touch electrode structure is disposed under the polarizer, the problem of the visible structure of the touch electrode can be improved, and the visual effect of the touch display panel is improved.

1, 2‧‧‧ touch display panel

11, 21‧‧‧ substrate

111, 211‧‧ ‧ shadowing layer

12, 22‧‧‧ polarizer

13, 23‧‧‧ display module

131, 231‧‧‧ color filter substrate

132, 232‧‧‧ liquid crystal layer

133, 233‧‧ ‧ Thin film transistor substrate

14, 24‧‧‧ first touch electrode structure

15, 25‧‧‧second touch electrode structure

16, 26‧‧‧ external polarizers

A‧‧‧ glue layer

P‧‧‧ protective layer

FIG. 1A is a schematic diagram of a touch display panel according to a first embodiment of the present invention.

FIG. 1B is a schematic view showing a substrate frame attached to a polarizer.

FIG. 1C is a schematic diagram of an external polarizer disposed on a touch display panel.

2A is a schematic diagram of a touch display panel according to a second embodiment of the present invention.

FIG. 2B is a schematic diagram of an external polarizer disposed on the touch display panel.

A touch display panel according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein like elements will be described with the same reference numerals.

FIG. 1A is a schematic diagram of a touch display panel according to a first embodiment of the present invention. Referring to FIG. 1A , the touch display panel 1 includes a substrate 11 , a polarizer 12 , a display module 13 , a first touch electrode structure 14 , and a second touch electrode structure 15 . The touch display panel 1 can be used, for example, but not limited to, in a touch system, an interactive advertising system, a store order ordering system, an access control system, an information inquiry system, a withdrawal system, or a portable mobile device. .

In this embodiment, the display module 13 is a liquid crystal display module (LCM), which may include a color filter (CF) substrate 131, a liquid crystal layer 132, and a thin film transistor ( Thin Film Transistor (TFT) substrate 133. The color filter substrate 131 is disposed opposite to the thin film transistor substrate 133, and the liquid crystal layer 132 is disposed between the color filter substrate 131 and the thin film transistor substrate 133. However, in other implementations, the display module 13 can also be, for example, a light emitting diode display module or an organic light emitting diode (OLED) display module, and the internal structure and composition thereof can respectively include a light emitting diode layer or The organic light emitting diode layer is substituted for the liquid crystal layer 132.

The display module 13 is disposed opposite to the substrate 11 , and the polarizer 12 is disposed between the substrate 11 and the display module 13 . Further, the substrate 11 is disposed above the color filter substrate 131 of the display module 13 , that is, with respect to the other side of the liquid crystal layer 132 . Further, the substrate 11 has a light transmissive property and may be a light transmissive material such as glass or plastic. In this embodiment, the substrate 11 can be a cover glass of the touch display panel 1 , and the other side of the polarizer 12 can provide a direct touch operation of the user. In addition, some functional layers such as anti-glare may be disposed on the substrate 11. Light, anti-fingerprint, anti-reflection and other functional layers. In another embodiment, the substrate 11 can also be an outer polarizer, and the material and structure thereof can be the same as the material and structure of the polarizer 12 .

The first touch electrode structure 14 is disposed on the substrate 11 and located between the substrate 11 and the polarizer 12 . In other words, the first touch electrode structure 14 is disposed on a side of the substrate 11 facing the polarizer 12, that is, below the substrate 11. In this embodiment, the first touch electrode structure 14 is directly formed on the substrate 11 , and the substrate 11 serves as an attachment or bearing component of the first touch electrode structure 14 . The first touch electrode structure 14 can be formed by process steps such as, but not limited to, coating, printing, or etching. Here, the first touch electrode structure 14 has a first axial electrode pattern.

It is worth mentioning that at least one shielding layer 111 may be formed before the first touch electrode structure 14 before the first touch electrode structure 14 is formed. In this embodiment, the shielding layer 111 may be an ink or a combination of a photoresist or an ink layer and a photoresist layer, which is disposed on a side of the portion of the substrate 11 with respect to the polarizer 12 to form a non-visible area, and is located on the substrate 11 The peripheral area, and the portion of the substrate 11 where the shielding layer 111 is not provided forms a visible area. The shielding layer 111 can shield the wires (not shown) outside the first touch electrode structure 14 or other circuit components that are not suitable for being seen by the user, so that the touch display panel 1 has an aesthetic effect.

In addition, the first touch electrode structure 14 may be in the form of a metal nanowire, a transparent conductive film, or a metal mesh. The metal nanowire may be, for example, a silver nanowire (SNW) or a carbon nanotube (CNT), and the transparent conductive film may be, for example, indium tin oxide (ITO) or indium zinc. Indium zinc oxide (IZO), fluorine doped tin oxide (FTO), aluminum doped zinc oxide (AZO), gallium doped zinc oxide (GZO) or graphite Graphene. In addition, a protective layer P is disposed on the first touch electrode structure 14 , which is an insulating material, and can prevent the transparent conductive film or metal of the first touch electrode structure 14 from being oxidized.

The second touch electrode structure 15 is disposed on the polarizer 12 , and specifically refers to the second touch electrode structure 15 attached to the upper surface or the lower surface of the polarizer 12 . In the embodiment, the second touch electrode structure 15 is disposed on a side of the polarizer 12 facing the display module 13 , that is, below the polarizer 12 . In other words, the second touch electrode structure 15 is located between the polarizer 12 and the display module 13 . In detail, the second touch electrode structure 15 is directly formed on the polarizer 12, The polarizer 12 serves as an attachment or carrying component of the second touch electrode structure 15 , thereby saving one of the substrates of the touch electrode structure in the prior art and reducing the overall thickness of the touch display panel. The second touch electrode structure 15 can be formed by a process step such as, but not limited to, coating, printing, or etching. Here, the second touch electrode structure 15 has a second axial electrode pattern, and the second axial direction is alternately arranged with the first axial direction, for example, perpendicular to each other.

Similarly, the second touch electrode structure 15 may be in the form of a metal nanowire, a transparent conductive film, or a metal mesh. The description may refer to the first touch electrode structure 14, and no longer Narration. In addition, another protective layer P can be disposed on the second touch electrode structure 15 , which is an insulating material, and can prevent the transparent conductive film or metal of the second touch electrode structure 15 from being oxidized.

Further, the touch display surface of the touch display panel 1 of the present invention is the other side of the substrate 11 opposite to the polarizer 12. As shown, the touch display surface is the upper surface of the substrate 11. The second touch electrode structure 15 is located under the polarizer 12, and since the light transmittance of the polarizer 12 is lower than that of the ordinary transparent or substantially transparent substrate, the electrode pattern in the second touch electrode structure 15 can be improved. The problem of the touch display panel 1 is improved. Alternatively, when there are some opaque or highly reflective components in the second touch electrode structure 15, such as a metal nanowire or a metal mesh to form a touch electrode structure, the polarizer 12 can also reduce the The visibility of the component improves the visual effect of the touch display panel 1. In addition, when the substrate 11 is an external polarizer, the outer polarizer has the same properties as the polarizer 12, so that the first touch electrode structure 14 and the second touch electrode structure 15 can be improved by the substrate 11 (outer polarizer). The middle electrode pattern is visible or visible to other components.

A glue layer A is disposed between the first touch electrode structure 14 and the polarizer 12 . In this embodiment, the substrate 11 on which the first touch electrode structure 14 is formed is bonded to the polarizer 12 via the adhesive layer A, and is bonded to the polarizer 12 by one side of the first touch electrode structure 14 . on. In practice, the adhesive layer A can be an optical adhesive, and has a light transmitting property, so that the first touch electrode structure 14 can be completely adhered to the polarizer 12 . However, in other embodiments, the adhesive layer A may be an opaque material, and is only disposed within the coverage of the shielding layer 111 for frame fitting, as shown in FIG. 1B. Of course, the adhesive layer A to which the frame is attached may also be a light-transmitting material, which is not limited herein.

Another adhesive layer is disposed between the second touch electrode structure 15 and the display module 13 A. In this embodiment, the polarizer 12 of the second touch electrode structure 15 is adhered to the display module 13 through the adhesive layer A, and is attached to the display by one side of the second touch electrode structure 15. On the module 13. Similarly, the second layer of the touch electrode structure 15 can be attached to the display module 13 in a manner that is fully bonded or framed. For the description, reference is made to the above description, and details are not described herein.

In addition, the touch display panel 1 may further include an outer polarizer 16 disposed on the other side of the substrate 11 relative to the display module 13 . Please refer to FIG. 1C , which is a schematic diagram of an external polarizer disposed on the touch display panel. In the present embodiment, the outer polarizer 16 and the polarizer 12 may be made of the same material, such as, but not limited to, a polyester film (PET flim) or a cellulose triacetate film (TAC film). With the arrangement of the outer polarizer 16, since the transmittance of the outer polarizer 16 to a transparent or substantially transparent substrate such as glass is relatively low, the conductive pattern on the shielded wire or the touch electrode structure can be further enhanced.

2A is a schematic diagram of a touch display panel according to a second embodiment of the present invention. Referring to FIG. 2A , the touch display panel 2 includes a substrate 21 , a polarizer 22 , a display module 23 , a first touch electrode structure 24 , and a second touch electrode structure 25 . The display module 23 of the present embodiment is described by a liquid crystal display module having a color filter substrate 231, a liquid crystal layer 232, and a thin film transistor substrate 233. In addition, the description of each element of the embodiment can be referred to the above embodiment, and only the differences between the embodiment and the first embodiment will be described below.

In the embodiment, the second touch electrode structure 25 is located between the substrate 21 and the polarizer 22 . The second touch electrode structure 25 is disposed on a side of the polarizer 22 facing the substrate 21 , that is, above the polarizer 22 . Specifically, the second touch electrode structure 25 is directly formed on the polarizer 22, and the polarizer 22 serves as an attachment or carrying component of the second touch electrode structure 25, thereby saving the sensing substrate in the prior art and reducing the touch. Control the overall thickness of the display panel. The second touch electrode structure 25 can be formed by process steps such as, but not limited to, coating, printing, or etching.

In addition, in the embodiment, the polarizer 22 of the second touch electrode structure 25 is adhered to the display module 23 through the adhesive layer A, and is attached to the display module by one side of the polarizer 22 23 on. On the other hand, the first touch electrode structure 24 is bonded to the second touch electrode structure 25 through another adhesive layer A. Here, each of the adhesive layers A can be implemented in a manner of full-fitting or frame-fitting, and the description thereof can be referred to the above embodiment, and no further description is provided herein.

Similarly, at least one shielding layer 211 may be formed on the substrate 21 to form a non- The visible area can shield the wires outside the first touch electrode structure 24 (not shown), and the user can easily see the wires and has an aesthetic effect.

In addition, a protective layer P may be disposed on the first touch electrode structure 24 or the second touch electrode structure 25, which is an insulating material, which can avoid transparent conductive of the first touch electrode structure 24 or the second touch electrode structure 25. The film or metal is oxidized.

FIG. 2B is a schematic diagram of an external polarizer disposed on the touch display panel. As shown in FIG. 2B , in the embodiment, the touch display panel 2 can also include an outer polarizer 26 disposed on the other side of the substrate 21 relative to the display module 23 . By the arrangement of the outer polarizer 26, since the transmittance of the outer polarizer 26 to a transparent or substantially transparent substrate such as glass is relatively low, the conductive pattern on the shielded wire or the touch electrode structure can be further enhanced.

In summary, the touch display panel of the present invention can save the use of the substrate by providing the touch electrode structure on the polarizer, thereby reducing the weight and thickness of the touch display panel. In addition, when the touch electrode structure is disposed under the polarizer, the problem of visible structure of the touch electrode can be improved. In some embodiments, the addition of the outer polarizer further improves the visibility of the touch electrode structure and improves the visual effect of the touch display panel.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1‧‧‧Touch display panel

11‧‧‧Substrate

111‧‧‧Shielding layer

12‧‧‧ polarizer

13‧‧‧Display module

131‧‧‧Color filter substrate

132‧‧‧Liquid layer

133‧‧‧Thin film transistor substrate

14‧‧‧First touch electrode structure

15‧‧‧Second touch electrode structure

A‧‧‧ glue layer

P‧‧‧ protective layer

Claims (8)

A touch display panel includes: a substrate having light transmissivity; a display module disposed opposite to the substrate; a polarizer disposed between the substrate and the display module; and a first touch electrode structure The substrate is disposed between the substrate and the polarizer; and a second touch electrode structure is directly disposed under the polarizer. The touch display panel of claim 1, wherein the second touch electrode structure is located between the polarizer and the display module. The touch display panel of claim 2, wherein a glue layer is disposed between the first touch electrode structure and the polarizer. The touch display panel of claim 2, wherein a glue layer is disposed between the second touch electrode structure and the display module. The touch display panel of claim 1, wherein the first touch electrode structure and the second touch electrode structure respectively comprise a metal nanowire, a transparent conductive film or a metal mesh. The touch display panel of claim 1, wherein the substrate is provided with at least one shielding layer, and the shielding layer is located at a peripheral region of the substrate. The touch display panel of claim 1, further comprising an outer polarizer disposed on the other side of the substrate relative to the display module. The touch display panel of claim 1, wherein the substrate is an outer polarizer and has the same structure as the polarizer.