CN205451020U - Graphite alkene capacitive touch screen with forced induction - Google Patents

Abstract

A graphene capacitive touch screen with pressure sensitivity, its structure includes a cover layer, an OCA optical adhesive layer a, an upper graphene transparent conductive film layer, a lower graphene transparent conductive film layer, a pressure-sensitive polymer elastomer, OCA Optical adhesive layer b, display module, peripheral circuit, interface chip a, peripheral circuit, interface chip b and main control chip. There is a layer of transparent insulating polymer elastomer between the two graphene transparent conductive film layers to adapt to changes in external touch pressure. During operation, the touch pressure causes local deformation of the polymer elastomer, resulting in a change in local capacitance, and the magnitude of the touch pressure is deduced. And the sensitivity of pressure perception can be improved through the micro-nano structured design of the polymer elastomer. The graphene touch screen of the utility model realizes pressure sensing, has the advantages of being foldable, high sensitivity, light and thin, high light transmittance, high electrical conductivity, low cost, and environmental protection, and lays the foundation for a new touch device.

Description

A graphene capacitive touch screen with pressure sensitivity

technical field

The utility model belongs to the field of electronic information technology touch screens, in particular to a graphene capacitive touch screen with pressure induction.

Background technique

Touch screen, also known as "touch screen" and "touch panel", has become a personal mobile communication device and comprehensive information terminal such as smart phone, tablet computer, smart phone, The main means of human-computer interaction such as ultra-notebook computers, wearable devices, and operation interfaces of machine equipment. According to different working principles, touch screens can be divided into four main types: capacitive touch screens, resistive touch screens, infrared touch screens and surface acoustic wave touch screens. Among them, the capacitive touch screen has a series of advantages such as multi-touch, fast response time, long service life, high light transmittance and superior user experience. At the same time, with the gradual maturity of the technology, the yield rate has been significantly improved, and the price has been reduced day by day. Capacitive touch screens have now become the main way of touch interaction for small and medium-sized information terminals.

In recent years, the application of graphene touch screen has received great attention, especially in the future flexible display, wearable devices and other fields have broad market prospects. However, capacitive touch screens at this stage include graphene touch screens, which only sense the touch position on the plane (X, Y axis two-dimensional space) where the screen body is located, and it is difficult to support the perception of touch parameters perpendicular to the screen body plane (Z axis), that is, pressure induction.

Utility model content

The purpose of the utility model is to provide a graphene capacitive touch screen with pressure sensitivity, which can realize the induction of plane position information and Z-axis pressure.

The utility model relates to a graphene capacitive touch screen with pressure sensitivity, comprising a cover layer, an OCA optical adhesive layer a, an upper graphene transparent conductive film layer, a lower graphene transparent conductive film layer, and a pressure-sensitive polymer Elastomer, OCA optical adhesive layer b, display module, peripheral circuit in the vertical conduction area, interface chip a, peripheral circuit in the lateral conduction area, interface chip b and the main control chip; in the upper layer of graphene transparent conductive film layer and the lower layer of graphite A layer of transparent insulating polymer elastomer is arranged in the middle of the vinyl transparent conductive film layer. The polymer elastomer can produce obvious deformation under pressure. The polymer elastomer is PDMS (polydimethylsiloxane), TPU ( Polyurethane elastomer), silicone rubber or polyurethane rubber and other materials, with a thickness of 0.1-500um; the graphene transparent conductive film layer is prepared by a large-scale CVD method, and transferred to a transparent flexible substrate in a large area. It is 1-10 layers, its square resistance is 10-1000Ω/□, and its light transmittance is 80-97%. The upper layer graphene and the lower layer graphene transmit the touch position information and pressure information to the main control through peripheral circuits and interface chips. chip, the main control chip obtains the touch position and the corresponding touch pressure for the operation of the graphene capacitive touch screen according to the input information of the interface chip a and the interface chip b.

The graphene in the upper graphene transparent conductive film layer is divided into a plurality of mutually equidistant and parallel longitudinal conduction regions, and the graphene in the lower graphene layer transparent conductive film layer is divided into a plurality of mutually equidistant and parallel Equal lateral conduction area.

The pressure-sensitive polymer elastomer can be a smooth elastomer film, or micro-nano structures can be further arranged on the surface of the elastomer film to enhance the elastic deformation ability of the elastomer under the same pressure, thereby improving the pressure transmission. Sensitivity, surface micro-nano structures include pyramids, cylinders, rectangular pillars, regular hexagonal pillars, cones, etc., with a characteristic size of 100nm to 100um and a height of 100nm to 100um.

Described interface chip comprises the interface chip a of vertical circuit and the interface chip b of horizontal circuit, wherein the vertical conduction area of upper layer graphene is connected with vertical circuit interface chip a through the peripheral circuit of vertical conduction area, the transverse conduction area of lower graphene The peripheral circuit through the lateral conduction area is connected with the lateral circuit interface chip b.

The interface chip a collects and processes the longitudinal position information in the Y direction, and the interface chip b collects and processes the longitudinal position information in the X direction, and inputs (X, Y) information to the main control chip to obtain the specific position information of the touch.

The main control chip collects the change of capacitance formed by the upper and lower layers of graphene at the touch position (X, Y), and processes it as a pressure value.

The graphene capacitive touch screen involved in the utility model has pressure sensing ability, and the pressure sensing range is 0.1Pa～100kPa, and its application includes touch screen mobile phone, touch screen computer, touch screen display of wearable devices, etc.

Description of drawings

Fig. 1 is the device structure sectional view of the graphene capacitive touch screen with pressure sensitivity described in embodiment one, wherein 101 is a cover plate layer, 102 is an OCA optical glue layer a, 103 is an upper graphene transparent conductive film layer, 104 It is a pressure-sensitive polymer elastomer, 105 is a lower graphene transparent conductive film layer, 106 is an OCA optical adhesive layer b, and 107 is a display module;

Fig. 2 is the graphene circuit diagram of touch screen, wherein 201 is the longitudinal conduction region of upper graphene, 202 is the transverse conduction region of lower graphene, 203 is the peripheral circuit of longitudinal conduction region, 204 is the interface chip a of vertical circuit, 205 is The peripheral circuit of the lateral conduction area, 206 is the interface chip b of the lateral circuit, and 207 is the main control chip;

Fig. 3 is the device structure sectional view of the graphene capacitive touch screen with pressure sensitivity described in embodiment two, wherein 301 is a cover plate layer, 302 is an OCA optical adhesive layer a, 303 is an upper graphene transparent conductive film layer, 304 It is a pressure-sensitive polymer elastomer, 305 is the lower graphene transparent conductive film layer, 306 is the OCA optical adhesive layer b, and 307 is the display module.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Embodiment one

The device structure of the pressure-sensitive graphene capacitive touch screen of the present embodiment is as shown in Figure 1, and the upper graphene transparent conductive film layer 103 and the lower graphene transparent conductive film layer 104 all adopt CVD growth graphene to make, and through large The area transfer method is transferred to the flexible PET substrate. The number of layers of the graphene is 1 layer, the square resistance is 200Ω/sq, and the light transmittance range is 91%.

In this embodiment, the patterning of the graphene transparent conductive film is realized by photolithography and etching.

In this embodiment, the graphene capacitive touch screen also includes a pressure-sensitive polymer elastomer 104, and the upper graphene transparent conductive film layer 103 and the lower graphene transparent conductive film layer 105 are respectively positioned on the pressure-sensitive polymer elastomer. 104 upper and lower surfaces.

In this embodiment, the pressure-sensitive polymer elastomer 104 is made of PDMS material with a thickness of 50 um, and the surface is treated with micro-nano structure.

In this embodiment, the micro-nano structure is pyramid-shaped, with a characteristic size of 5 um and a height of 5 um.

In this embodiment, the upper layer of graphene transparent conductive film layer 103 is divided into a plurality of mutually equidistant and parallel longitudinal conductive regions 201 by laser etching, and the lower layer of graphene transparent conductive film layer 105 is divided by laser etching. It is divided into a plurality of longitudinal conduction regions 202 that are equally spaced and parallel to each other.

In this embodiment, the vertical conduction region 201 is connected to the vertical circuit interface chip 204 through the peripheral circuit 203 of the vertical conduction region, and the lateral conduction region 202 of the lower graphene is connected to the interface chip 206 of the lateral circuit through the peripheral circuit 205 of the lateral conduction region.

In this embodiment, the interface chip 204 and the interface chip 206 are connected to the main control chip to collect and process the position information and pressure information of the touch screen.

In this embodiment, the capacitive touch screen further includes a cover layer 101, a display module 107, an OCA optical adhesive layer a102 and an OCA optical adhesive layer b106, and the cover layer 101 is transparent to the upper graphene through the OCA optical adhesive layer a102. The conductive film layers 103 are bonded together, and the display module 107 is bonded together with the lower graphene transparent conductive film layer 105 through the OCA optical adhesive layer b106.

In this embodiment, the cover layer 101 is made of transparent glass material.

Embodiment two

The device structure of the pressure-sensitive graphene capacitive touch screen of the present embodiment is as shown in Figure 3, and the upper graphene transparent conductive film layer 303 and the lower graphene transparent conductive film layer 304 are all made of CVD grown graphene, and Transferred to a flexible PI substrate by a large-area transfer method, the number of layers of the graphene is 3 layers, the square resistance is 100Ω/sq, and the light transmittance range is 85%.

In this embodiment, the graphene capacitive touch screen also includes a pressure-sensitive polymer elastomer 304, and the upper graphene transparent conductive film layer 303 and the lower graphene transparent conductive film layer 305 are located on the pressure-sensitive polymer elastomer respectively. 304 upper and lower surfaces.

In this embodiment, the pressure-sensitive polymer elastomer 304 is made of TPU material with a thickness of 200 um, and the surface is not treated with micro-nano structure.

In this embodiment, the upper layer of graphene transparent conductive film layer 303 is divided into a plurality of mutually equidistant and parallel longitudinal conductive regions 201 by laser etching, and the lower layer of graphene transparent conductive film layer 305 is divided by laser etching. It is divided into a plurality of longitudinal conduction regions 202 that are equally spaced and parallel to each other.

In this embodiment, the vertical conduction region 201 is connected to the vertical circuit interface chip 204 through the peripheral circuit 203 of the vertical conduction region, and the lateral conduction region 202 of the lower graphene is connected to the interface chip 206 of the lateral circuit through the peripheral circuit 205 of the lateral conduction region.

In this embodiment, the interface chip 204 and the interface chip 206 are connected to the main control chip to collect and process the position information and pressure information of the touch screen.

In this embodiment, the capacitive touch screen further includes a cover layer 301, a display module 307, an OCA optical adhesive layer a302 and an OCA optical adhesive layer b306, and the cover layer 301 is transparent to the upper graphene through the OCA optical adhesive layer a302. The conductive film layers 303 are bonded together, and the display module 307 is bonded together with the lower graphene transparent conductive film layer 305 through the OCA optical adhesive layer b306.

In this embodiment, the cover layer 301 is made of polyethylene terephthalate PET material.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (7)

1. a graphene capacitive touch screen with pressure sensitivity, comprising a cover plate (101), an OCA optical adhesive layer a (102), an upper graphene transparent conductive film layer (103), a lower graphene transparent conductive film layer ( 105), pressure-sensitive polymer elastomer (104), OCA optical adhesive layer b (106), display module (107), peripheral circuit in the longitudinal conduction area (203), interface chip a (204), transverse conduction area Peripheral circuit (205), interface chip b (206) and main control chip (207); It is characterized in that: set in the middle of upper graphene transparent conductive film layer (103) and lower graphene transparent conductive film layer (105) A layer of transparent insulating polymer elastomer (104), which can produce obvious deformation under pressure, and the polymer elastomer is polydimethylsiloxane, polyurethane elastomer, silicone rubber or polyurethane rubber material One of them, with a thickness of 0.1-500um; the upper graphene transparent conductive film layer and the lower graphene transparent conductive film layer are made of graphene grown by CVD method, and transferred to a transparent flexible substrate in a large area, and the number of layers is 1-10 layers, its square resistance is 10-1000Ω/□, and its light transmittance is 80-97%; the upper layer graphene and the lower layer graphene transmit the touch position information and pressure information to the main control chip through peripheral circuits and interface chips (207), the main control chip (207) obtains the touch position and the corresponding touch pressure operated on the graphene capacitive touch screen according to the input information of the interface chip a (204) and the interface chip b (206). 2. A kind of graphene capacitive touch screen with pressure sensitivity according to claim 1, it is characterized in that: the graphene in the upper layer of graphene transparent conductive film layer is divided into a plurality of mutually equally spaced and parallel longitudinal conduction regions (201), the graphene in the lower graphene transparent conductive film layer is divided into a plurality of mutually equidistant and equal lateral conduction regions (202). 3. A kind of graphene capacitive touch screen with pressure sensitivity according to claim 1, is characterized in that: described pressure-sensitive polymer elastomer (104), can be smooth elastomer film, or can further Set micro-nano structures on the surface of the elastomer film to enhance the elastic deformation ability of the elastomer under the same pressure, thereby improving the sensitivity of pressure sensing. The surface micro-nano structures include pyramids, cylinders, rectangular columns, regular hexagonal columns, and cones. , the characteristic size is 100nm-100um, and the height is 100nm-100um. 4. A kind of graphene capacitive touch screen with pressure sensitivity according to claim 1, is characterized in that: described interface chip comprises the interface chip a (204) of vertical circuit and the interface chip b (206) of horizontal circuit , wherein the vertical conduction region (201) of the upper graphene is connected with the vertical circuit interface chip a (204) through the peripheral circuit (203) of the vertical conduction region, and the lateral conduction region (202) of the lower graphene is passed through the peripheral circuit of the lateral conduction region (205) is connected to the lateral circuit interface chip b (206). 5. a kind of graphene capacitive touch screen with pressure induction according to claim 1 is characterized in that: described interface chip a (204) collects and processes longitudinal Y direction position information, and interface chip b (206) collects And process the position information in the longitudinal X direction, and input the (X, Y) information to the main control chip (207) to obtain the specific position information of the touch. 6. A kind of graphene capacitive touch screen with pressure sensitivity according to claim 1, is characterized in that: described main control chip (207) changes the capacitance that the upper and lower two layers of graphene at touch position place constitutes. collected and processed as pressure values. 7. A graphene capacitive touch screen with pressure sensitivity according to claim 1, characterized in that the pressure sensing range is 0.1Pa～100kPa.