In-cell touch display screen and touch display screen module
Technical Field
The invention relates to the technical field of touch display, in particular to an embedded touch display screen and a touch display screen module.
Background
Nowadays, electronic display products having a touch function have been widely used, and more replace conventional mechanical keyboards as input devices, for example: from smart mobile phones, tablet computers, notebooks, all-in-one machines, even electronic blackboards with larger sizes and the like with small sizes, people can give instructions more intuitively and conveniently by directly clicking icons on a display or directly input characters by touching a virtual keyboard.
Currently, touch screens of electronic products with touch display function in the market are generally classified into resistive type, capacitive type, infrared type, ultrasonic type, and the like, and among them, capacitive type touch screens are most widely used.
Currently, a capacitive touch display module mainly includes an external touch display module and an embedded touch display module. Whether the touch display module is hung outside or embedded, the touch display module structurally comprises a protective cover plate, and a touch sensing unit and a display screen which are arranged below the protective cover plate. The touch sensing unit of the plug-in type touch display module is positioned between the protective cover plate and the display screen, and the touch sensing unit of the plug-in type touch display module is positioned inside the display screen.
The external hanging touch screen mainly comprises glass capacitive touch screens such as an OGS (touch sensing unit is directly arranged on the back of a protective cover plate), DITO (touch sensing unit is arranged on another independent glass substrate), and thin film capacitive touch screens such as GFF, GF, GF1 (touch sensing unit is arranged on a thin film substrate and then is attached to the protective cover plate).
The touch screen body of the external-hanging type touch screen or the embedded type touch screen comprises a visible area and a peripheral shading (BM) area (non-visible area); because the touch key area is often located in the BM area outside the visible area of the touch screen, the touch key conductive pattern and the visible area electrode pattern of the plug-in touch screen can be manufactured on the film or the glass substrate together, so that no separate touch key is required to be manufactured.
The main schemes of the embedded touch screen include an Oncell (a touch sensing unit is arranged between a color filter module and a polarizer) and an excel (a touch sensing unit is embedded into a liquid crystal pixel of a display screen).
Because the touch sensing unit of the embedded touch screen is embedded into the display screen, the touch sensing area of the embedded touch screen is limited to the effective area of the display screen (namely, the end face of one end of the display screen, and the end face of one end of the display screen is also the visible area of the touch display screen module), and the area outside the visible area, such as a key located in the BM area, cannot be sensed. Touch keys located outside the viewable area of the touch screen often need to be separately fabricated and attached to corresponding areas of the back side of the protective cover sheet.
Most of embedded touch display modules in the market at present are assembled with a protective cover plate in a full-lamination (whole lamination) mode, reflection caused by an air layer in frame lamination is reduced, and therefore good optical effects such as higher brightness and definition of the display screen are guaranteed.
At present, the method for independently manufacturing the conductive patterns of the touch keys on the back of the protective cover plate mainly comprises the following steps: attaching a conductive layer with an independent conductive key sensing unit to a touch key area outside a visible area on the back of the protective cover plate or directly manufacturing the conductive key sensing unit in the touch key area; and then the conductive key sensing unit is connected with the control circuit through a lead wire, and the touch signal is independently transmitted to the control circuit. The method adds the processes of lamination, circuit manufacture, binding and the like, and greatly adds additional manufacturing procedures and cost.
Disclosure of Invention
Accordingly, it is desirable to provide an in-cell touch display and a touch display module that can effectively reduce manufacturing processes and costs.
An in-cell touch display screen, comprising:
the embedded touch display main body is provided with a first end face and a second end face which are opposite;
the two polaroids are respectively arranged on the first end face and the second end face, the upper polaroid is arranged on the first end face and is used for being connected with a protective cover plate, the lower polaroid is arranged on the second end face and is used for being connected with a backlight unit, the area of the upper polaroid is larger than that of the first end face, the part of the upper polaroid, which is positioned on the first end face, is an effective area, the effective area corresponds to a touch sensing area of the embedded touch display main body, the part of the upper polaroid, which is positioned outside the first end face, is an extension area, a key area is arranged on the extension area, and the key area is used for corresponding to a touch key area arranged on the protective cover plate; and
the transparent conductive layer is arranged on one surface of the upper polaroid, extends from the key area to the effective area, is patterned to form touch key conductive patterns, and is used for acquiring touch key capacitance change signals and transmitting the touch key capacitance change signals to the touch sensing area of the embedded touch display main body.
In one embodiment, the embedded touch display main body includes a thin film transistor module, a liquid crystal module, a pixel electrode module, a touch electrode module and a color filter module which are sequentially stacked, the surface of the color filter module, which is far away from the touch electrode module, is the first end surface, and the surface of the thin film transistor module, which is far away from the liquid crystal module, is the second end surface.
In one embodiment, the extending area is a rectangle formed by extending from one side of the effective area, and the extending area is the key area;
in one embodiment, the extension area is a plurality of elongated strips formed by extending from one side of the active area, the plurality of elongated strips are arranged at intervals, and the extension area is the key area.
In one embodiment, the area of the lower polarizer is the same as the area of the second end surface.
In one embodiment, the touch key conductive pattern includes a plurality of touch key electrodes, each touch key electrode includes a sensing point area located on the key area and two transmission point areas located in the effective area, the sensing point areas are respectively electrically connected with the two transmission point areas, and the sensing point areas are used for corresponding to keys located on the protection cover plate.
In one embodiment, the touch key further comprises an insulating protection layer, wherein the insulating protection layer is arranged on the part, located on the key area, of the touch key conductive pattern.
In one embodiment, the touch key further comprises an insulating protection layer, wherein the insulating protection layer is arranged on one side, away from the upper polarizer, of the touch key conductive pattern.
A touch display screen module, comprising:
the embedded touch display screen; and
the protection cover plate comprises a visible area and a shading area, wherein a touch key area is arranged on the shading area, the protection cover plate is arranged on the upper polaroid, the visible area corresponds to the effective area, and the touch key area corresponds to the key area.
In one embodiment, the protective cover plate is a reinforced glass plate, a sapphire plate or a plastic plate, and the surface hardness of the protective cover plate is 3H or more.
The in-cell touch display screen increases the size (area) of the upper polarizer in the conventional in-cell touch display screen, so that the upper polarizer has an effective area on the first end surface and an extension area outside the first end surface. The transparent conductive layer is arranged on one surface of the upper polarizer and extends from the key area to the effective area. The transparent conductive layer is patterned to form a touch key conductive pattern, the touch key conductive pattern is used for acquiring a touch key capacitance change signal and transmitting the touch key capacitance change signal into a touch sensing area of the embedded touch display main body, so that key touch outside the embedded touch display main body can be sensed through a touch sensing unit in the touch sensing area of the embedded touch display main body, and touch instructions can be sensed by the touch key area.
The method does not need to independently manufacture a touch button and a wire so as to transmit a capacitance change signal to a control circuit. The embedded touch display screen omits independent keys, simplifies the manufacturing process, and effectively reduces the manufacturing process and the cost.
Drawings
FIG. 1 is a schematic diagram of a touch display module according to an embodiment;
FIG. 2 is a schematic diagram illustrating an assembly of the protective cover plate, the upper polarizer and the transparent conductive layer in FIG. 1;
FIG. 3 is a schematic diagram illustrating an assembly of a protective cover, an upper polarizer, and a transparent conductive layer according to another embodiment;
FIG. 4 is a schematic diagram illustrating an assembly of a protective cover, an upper polarizer, and a transparent conductive layer according to another embodiment;
FIG. 5 is a schematic diagram of a transparent conductive layer according to an embodiment;
FIG. 6 is a schematic view of a transparent conductive layer in another embodiment;
fig. 7 is a schematic structural view of a transparent conductive layer in another embodiment.
Detailed Description
The in-cell touch display and the touch display module are further described below with reference to the accompanying drawings and the detailed description.
As shown in fig. 1 and 2, a touch display module 10 according to an embodiment includes an in-cell touch display 12, a protective cover 14, and a backlight unit 16.
The in-cell touch display 12 includes an in-cell touch display main body 100, an upper polarizer 200, a lower polarizer 300, a transparent conductive layer 400, and a protective layer (not shown).
The touch display body 100 has a first end face 110 and a second end face 120 opposite to each other.
The upper polarizer 200 is disposed on the first end surface 110 and is used for connecting the protective cover 14. Wherein, the area of the upper polarizer 200 is larger than that of the first end surface 110. The portion of the upper polarizer 200 located on the first end surface 110 is an effective area 210, and the effective area 210 corresponds to the touch sensing area of the in-cell touch display body 100 (i.e., the first end surface 110 corresponds). The portion of the upper polarizer 200 located outside the first end surface 110 is an extended region 220. The extending area 220 is provided with a key area 222, and the key area 222 is used for corresponding to the touch key area 14c arranged on the protective cover plate 14.
The lower polarizer 300 is disposed on the second end surface 120 for connecting the backlight unit 16.
The transparent conductive layer 400 is disposed on a surface of the upper polarizer 200 and extends from the key region 222 to the active region 210. The transparent conductive layer 400 is patterned to form a touch key conductive pattern 410, and the touch key conductive pattern 410 is used for acquiring a touch key capacitance change signal and transmitting the touch key capacitance change signal to the touch sensing area of the in-cell touch display main body 100. The transparent conductive layer 400 may be disposed on either surface of the upper polarizer 200.
In the conventional touch display module, the protective cover 14 is disposed on the upper polarizer 200, and the visual area 14a of the protective cover 14 corresponds to the first end face 110, that is, a touch sensing unit is disposed below the visual area 14a, so that the visual area 14a of the protective cover 14 can sense a touch command. The touch sensing unit is not located below the touch key area 14c on the light shielding area 14b of the protective cover 14, so the touch key area 14c on the light shielding area 14b of the protective cover 14 cannot sense a touch command. In order to enable the touch key region 14c to sense a touch command, a conductive layer having an independent conductive key sensing unit is generally attached to the back surface of the touch key region 14c or the conductive key sensing unit is directly fabricated on the touch key region 14c, and then the key sensing unit is connected with the control circuit through a lead wire to independently transmit a touch signal to the control circuit. The conventional method adds the processes of lamination, circuit manufacture, binding and the like, and greatly adds additional manufacturing procedures and cost.
The in-cell touch display 12 increases the size (area) of the upper polarizer 200 in the conventional in-cell touch display, so that the upper polarizer 200 has an effective area 210 on the first end surface 110 and an extension area 220 outside the first end surface 110. The transparent conductive layer 400 is disposed on a surface of the upper polarizer 200 and extends from the key region 222 to the active region 210. The transparent conductive layer 400 is patterned to form a touch key conductive pattern 410, where the touch key conductive pattern 410 is used to obtain a touch key capacitance change signal and transmit the touch key capacitance change signal to the touch sensing area of the in-cell touch display main body 100, so that a key touch outside the in-cell touch display main body 100 can be sensed by a touch sensing unit in the touch sensing area of the in-cell touch display main body 100, that is, the touch key area 14c can sense a touch instruction.
The method does not need to independently manufacture a touch button and a wire so as to transmit a capacitance change signal to a control circuit. The embedded touch display screen 12 omits independent keys, simplifies the manufacturing process, and effectively reduces the manufacturing process and the cost.
The in-cell touch display 12 may be an in-cell touch display using an Oncell scheme, or an in-cell touch display using an Incell scheme. In the present embodiment, the in-cell touch display 12 is an in-cell touch display adopting an excel scheme. Specifically, the touch display main body 100 includes a thin film transistor module 130, a liquid crystal module 140, a pixel electrode module 150, a touch electrode module 160, and a color filter module 170 stacked in this order. The surface of the color filter module 170 away from the touch electrode module 160 is a first end surface 110, and the surface of the thin film transistor module 130 away from the liquid crystal module is a second end surface 120.
Specifically, the thin film transistor module 130 includes a glass substrate 132 and a TFT (Thin Film Transistor ) electrode 134 provided on the glass substrate 132. The color filter module 170 includes a glass substrate 172, a light shielding matrix 174 disposed on the glass substrate 172, and color filter units 176 dispersed in the light shielding matrix 174. The light shielding matrix 174 is typically formed of a black light shielding material. The color filter unit 176 is formed of red, green or blue photoresist material, and the three color filter units 176 are uniformly distributed in the light shielding matrix 174.
Further, as shown in fig. 2, in the present embodiment, the extension area 220 is a rectangle formed by extending from the active area 210 side, and the extension area 220 is a key area 222. In the present embodiment, the length of one side of the extension region 220 near the effective region 210 is equal to the length of one side of the effective region 210 near the extension region 220. As shown in fig. 3, it is understood that in other embodiments, the length of the side of the extended region 220 adjacent to the active region 210 may be less than the length of the side of the active region 210 adjacent to the extended region 220.
As shown in fig. 4, it can be appreciated that in other embodiments, the extension region 220 is a plurality of elongated shapes formed by extending from one side of the active region 210, and the plurality of elongated shapes are arranged at intervals. The extension area 220 is a key area 222. It is understood that in other embodiments, the extension region 220 may extend outward from the periphery of the active region 210, where the area of the extension region 220 is larger than the area of the key region 222.
Further, in the present embodiment, the area of the lower polarizer 300 is the same as the area of the second end surface 120.
Further, as shown in fig. 5, in the present embodiment, the touch key conductive pattern 410 includes a plurality of touch key electrodes 412. Each touch key electrode 412 includes a sensing point region 4122 located on the key region 222 and two transmission point regions 4124 located in the active region 210. The sensing point areas 4122 are electrically connected to two transmission point areas 4124, respectively, and the sensing point areas 4122 are used to correspond to the keys 14d provided on the protective cover 14. As shown in fig. 5 to 7, the shape of the sensing contact area 4122 and the transfer point area 4124 may be square, circular, elliptical, triangular, or the like.
Further, in the present embodiment, the transparent conductive layer 400 is a metal mesh conductive layer, an indium tin oxide conductive layer, a carbon nanotube conductive layer, a metal nanowire conductive layer, a graphene conductive layer, or a polyethylene dioxythiophene conductive layer.
When the transparent conductive layer 400 is a conductive layer made of a linear conductive material, for example, a carbon nanotube conductive layer, a metal nanowire conductive layer, or the like, the transparent conductive layer 400 may be directly formed by coating, transfer printing, or the like. When the transparent conductive layer 400 is a conductive layer made of transparent silver paste, the transparent conductive layer 400 may be directly formed by printing or the like. When the transparent conductive layer 400 is a metal mesh conductive layer, the forming method comprises forming a transparent UV glue layer on the upper polarizer, forming a groove by embossing, and filling conductive filler in the groove by printing or coating, wherein the depth of the groove is 1 um-5 um; the width of the groove is 1 um-5 um; the conductive filler is conductive metal such as nano silver, nano copper, nano gold or transparent conductive material such as graphene.
Further, in the present embodiment, the insulating protection layer is disposed on the portion of the touch key conductive pattern 410 located on the key region 222, that is, the insulating protection layer covers only a portion of the touch key conductive pattern 410. The insulating protective layer may be formed by printing, pasting, laminating, coating, or the like. It will be appreciated that in other embodiments, the insulating protective layer is disposed on the side of the touch key conductive pattern 410 remote from the upper polarizer 200, i.e., the insulating protective layer covers the entire touch key conductive pattern 410.
The protective cover 14 includes a visible area 14a and a light shielding area 14b, and the light shielding area 14b is provided with a touch key area 14c. The protective cover 14 is disposed on the upper polarizer 200, and the visible area 14a corresponds to the effective area 210, and the touch key area 14c corresponds to the key area 222. In the present embodiment, the touch key region 14c is provided with three keys 14d. Each key 14d has a touch key electrode 412 corresponding thereto.
Further, in the present embodiment, the protective cover 14 is attached to the in-cell touch display 12 by an optically transparent adhesive layer (not shown).
Further, in the present embodiment, the protective cover 14 is a tempered glass plate, a sapphire plate, or a plastic plate, and the surface hardness of the protective cover 14 is 3H or more (3H is a pencil hardness grade). Thereby effectively avoiding the touch display screen module 10 from being scratched. The plastic plate may be formed by compounding one or more plastic materials such as PET (polyethylene terephthalate), PC (polycarbonate), PMMA (polymethyl methacrylate), etc.
The backlight unit 16 is disposed on the lower polarizer 300.
The touch display screen module 10 omits independent keys, simplifies the manufacturing process and effectively reduces the manufacturing process and the cost.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.