CN202167005U - A capacitive touch screen - Google Patents

Abstract

The utility model provides a capacitive touch screen, which includes a glass film substrate and a touch-sensitive glass substrate arranged oppositely. The side edge of the touch-sensitive glass substrate is bonded with a plastic part with a changeable shape through a first adhesive layer, and the shape can be changed. The plastic part and the touch-sensitive glass substrate are composited into a whole, and the composite whole is combined with the glass film substrate through the second bonding layer. In the capacitive touch screen provided by the utility model, the upper layer adopts a glass film, and the lower layer adopts a composite body of a plastic part with a changeable shape and a touch-sensitive glass substrate. The touch-sensitive glass substrate can adopt a touch-sensitive glass substrate with a conventional thickness, which not only saves The cost of materials also improves the yield rate of the product. At the same time, the upper layer uses a glass film, and the lower operating area uses a glass sensor sheet with sufficient strength as the substrate. The finger touch of the overall product has achieved the effect of a fully vitrified capacitive screen, without a sense of collapse, and the end user experience is greatly improved.

Description

A capacitive touch screen

technical field

The utility model belongs to the technical field of touch, in particular to a capacitive touch screen.

Background technique

With the development of electronics and semiconductor technology, touch technology, as an extremely convenient and effective human-computer interaction solution, is becoming a fashionable mainstream. At present, it has been widely used in many fields of social production and life, especially in the field of consumer electronics products. There are many types of touch screen technologies, mainly including resistive, infrared, surface acoustic wave, and emerging optical, pressure-sensitive, and capacitive, each with its own advantages and disadvantages, and each has its own target application market.

However, due to the limitations of the principle and process flow, the touch technology used in small and medium-sized fields is mainly resistive and capacitive. Among them, the resistive touch screen has been developed for a long time, the technology is relatively mature, and the cost is relatively low; while the capacitive touch screen is durable. Both performance and weather resistance have been greatly improved, and at the same time, it can effectively support multi-touch. Therefore, since the launch of Apple's iPhone, capacitive touch screens have entered explosive growth, and they are likely to completely replace resistive touch screens.

There are currently two types of capacitive touch screen technology in small and medium-sized consumer products such as mobile phones: one is glass-type projected capacitive touch technology represented by Apple series products, and the upper layer is usually processed by CNC machine tools and lengthy chemical processes. A single piece of glass lens made by strengthening and other processes has a decorative effect, and the lower layer is an ultra-thin glass sensor sheet with a touch sensing function. The two are bonded together by optically transparent adhesive (OCA) or UV adhesive. The other is thin-film projected capacitive touch technology. Its surface is a single piece of decorative glass lens or a plastic lens directly processed by CNC machine tools. The film is composed of at least 3-4 layers of film materials such as the conductive film for X-direction induction, the conductive film for Y-direction induction, and the conductive film for shielding effect. Compared with glass-type touch technology, film-type The main competitive advantage of touch technology lies in the ability to develop lighter, thinner, and lower-cost touch panels. However, since tablet computers must withstand a large number of touches during use, the durability of thin-film touch technology products is relatively poor, which has become a relative disadvantage in their competition.

However, the two capacitive touch technologies mentioned above have corresponding disadvantages: the glass lens on the upper layer of the glass touch technology is processed by precision CNC machine tools and lengthy chemical strengthening processes, the price and cost are relatively high, and the lower layer touches The ultra-thin glass sensor sheet with control sensing function is very thin, and the raw material price is extremely high. At the same time, the glass is easily broken during the production process, and the yield loss is large, which finally leads to the high price of touch components. The upper layer of thin-film touch technology adopts the method of direct plastic processing, which can effectively reduce the cost, but the lower layer is a touch sensor sheet made of at least 3-4 layers of conductive film bonded layer by layer. The cost of raw materials and bonding yield will lead to The cost of the sensor sheet is relatively high, and due to the soft nature of the plastic itself, it will cause a sense of collapse when used, and the display screen will be easily damaged when pressed hard, resulting in a greatly reduced user experience.

Contents of the invention

The purpose of the utility model is to solve the technical problems that the cost of glass and film touch technologies in the prior art is relatively high, and the film touch technology has a sense of collapse when used, and the user experience is greatly reduced when pressed, and provides a Lower cost, capacitive touchscreens that don't feel slump and enhance the user experience.

A capacitive touch screen, comprising a glass film substrate and a touch-sensitive glass substrate oppositely arranged, the side edge of the touch-sensitive glass substrate is bonded with a shape-changing plastic part through a first adhesive layer, the shape-changeable plastic part and The touch-sensitive glass substrate is composited into a whole, and the composite whole is combined with the glass film substrate through the second bonding layer.

Further, the thickness of the glass film substrate is 0.03-0.4 mm.

Further, the material of the glass film substrate is glass or a composite of glass and polyethylene terephthalate.

Further, a surface decoration layer is formed on the appearance surface of the glass film substrate, and the thickness of the surface decoration layer is 4-20 microns.

Further, the thickness of the composite body of the shape-changeable plastic part and the touch-sensitive glass substrate is 0.5-1.5 mm.

Further, the plastic parts with changeable shape are also provided with positioning posts.

Further, the edge gap between the touch-sensitive glass substrate and the plastic part is 0.25-0.5 mm.

Further, the surface of the touch-sensitive glass substrate is provided with a touch-sensitive area, and the touch-sensitive area is formed by an indium tin oxide electrode layer.

Further, the indium tin oxide electrode layer is led out through molybdenum aluminum molybdenum electrode wires.

Further, the material of the first bonding layer is one of ultraviolet curing glue, heat drying glue, quick drying glue and silica gel.

In the capacitive touch screen provided by the utility model, the upper layer adopts a glass film, and the lower layer adopts a composite body of a plastic part with a changeable shape and a touch-sensitive glass substrate. The touch-sensitive glass substrate can adopt a touch-sensitive glass substrate with a conventional thickness, which is relatively In the prior art, the lower surface of the plastic lens is bonded with 3-4 layers of conductive touch-sensitive sheets through optical glue or the lower surface of the glass lens is bonded with ultra-thin touch-sensitive sheets through complex processes, which not only saves material costs, but also The yield rate of the product is improved. At the same time, the upper layer uses a glass film, and the lower operating area uses a glass sensor sheet with sufficient strength as the substrate. The flatness, light transmittance, and finger touch of the overall product have achieved the effect of a fully vitrified capacitive screen, and there is no sense of collapse when using it. User experience has been greatly improved.

Description of drawings

Fig. 1 is a schematic structural diagram of a capacitive touch screen provided by the present invention.

Fig. 2 is a schematic diagram of the composite structure of the plastic part and the touch-sensitive glass substrate provided by the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Please refer to FIG. 1 , a capacitive touch screen includes a glass film substrate 2 and a touch-sensitive glass substrate 1 oppositely arranged, and the side edge of the touch-sensitive glass substrate 1 is bonded with a shape changeable through a first adhesive layer 4. The plastic part 3 , the plastic part 3 with a changeable shape and the touch-sensitive glass substrate 1 are combined into a whole, and the composite whole is combined with the glass film substrate 2 through the second adhesive layer 5 .

In the capacitive touch screen provided by the utility model, the upper layer adopts a glass film, and the lower layer adopts a composite body of a plastic part with a changeable shape and a touch-sensitive glass substrate. The touch-sensitive glass substrate can adopt a touch-sensitive glass substrate with a conventional thickness, which is relatively In the prior art, the lower surface of the plastic lens is bonded with 3-4 layers of conductive touch-sensitive sheets through optical glue or the lower surface of the glass lens is bonded with ultra-thin touch-sensitive sheets through complex processes, which not only saves material costs, but also The yield rate of the product is improved. At the same time, the upper layer uses a glass film, and the lower operating area uses a glass sensor sheet with sufficient strength as the substrate. The flatness, light transmittance, and finger touch of the overall product have achieved the effect of a fully vitrified capacitive screen, and there is no sense of collapse when using it. User experience has been greatly improved.

Wherein, the material of the glass film substrate 2 is glass or a composite of glass and polyethylene terephthalate, and the composite of glass and polyethylene terephthalate (PET) refers to the A layer of vitrified silicon dioxide is formed on the PET film, and the glass film substrate 2 thus formed is a flexible material, which is convenient for rapid mass production and enables users to feel real glass when touched. The thickness of the glass film substrate 2 is 0.03-0.4 mm, and the thickness of the glass film substrate 2 is relatively thin, so that the sensing pattern on the touch-sensitive glass substrate 1 is closer to the human hand, and the operation sensitivity is improved; preferably, the glass film The thickness of the substrate is 0.25 mm.

Further, the exterior surface of the glass film substrate 2 is formed with a surface decoration layer, and the surface decoration layer is formed by printing on the back of the glass film substrate. In addition to printing, it can also be formed by silk screen printing, pad printing, spray coating, etc. Electroplating, etc.; the thickness of the surface decoration layer is 4-20 microns.

The touch-sensitive glass substrate can adopt a touch-sensitive glass substrate of conventional thickness, and the touch-sensitive glass substrate of conventional thickness is thicker, so that the sensing pattern on the touch-sensitive glass substrate is farther away from the display screen; on the contrary, the sensing pattern is farther away from the display screen; The closer the hands are, the more sensitive the operation will be, which provides convenience for the flexibility and difficulty of the subsequent chip debugging work. The surface of the touch-sensitive glass substrate is provided with a touch-sensing area, the touch-sensing area is formed by an indium tin oxide electrode layer, and the surface has a single-layer sensing pattern or a multi-layer sensing pattern to identify the user's input method and at the same time play a role in strength. The role of support. The method of forming the indium tin oxide electrode layer can adopt the common yellow light process of coating, exposure, development, and etching in the field of touch screen production to form the induction pattern of the indium tin oxide electrode layer on the surface of the glass substrate.

Those skilled in the art can easily understand that, besides indium tin oxide, any one of fluorine-doped tin oxide, aluminum-doped zinc oxide, and indium zinc oxide can also be used for the contact sensing region. Further, the induction pattern in the form of an indium tin oxide electrode layer is drawn out through the lead-out electrode, and the material of the lead-out electrode is molybdenum-aluminum-molybdenum, or drawn out by screen printing acid-resistant ink and silver paste electrode. Usually, the sensing pattern and the extraction electrodes are formed on a large piece of glass substrate, which can be cut into specific small pieces by using a glass knife according to the design size and specifications during specific applications.

Please refer to Fig. 2, the shape-changeable plastic part 3 is directly molded by the plastic mold injection method commonly used in the plastic industry, and a positioning column 31 is further provided on the shape-changeable plastic part. For the positioning when assembling with the housing of the electronic product in the subsequent manufacturing process, it effectively solves the problems of the appearance gap and the uniformity of the gap between the housing of the electronic product and the touch screen product after assembly. The molded plastic part 3 is first accurately positioned at an appropriate position on the side edge of the touch-sensitive glass substrate 1 by a fixing device, and a high-precision dispensing machine 6 commonly used in the field of display packaging is used to place the plastic part 3 and the touch-sensitive glass substrate 1 at the joining position Uniformly coat the first adhesive layer 4 for compounding. Said fixing device can adopt the simple and easy jig and clamp made by technicians, and said jig and clamp are easy to make and realize for those skilled in the art; or, said fixing device can also be other A device that enables accurate positioning.

When the shape-changeable plastic part 3 is bonded and combined with the side edge of the touch-sensitive glass substrate 1 through the first bonding layer 4, the edge gap between the touch-sensitive glass substrate and the plastic part is 0.25-0.5 mm, if the connection gap between the touch-sensitive glass substrate and the plastic parts is greater than 0.5 mm, it will cause waste of bonding materials; if it is less than 0.25 mm, the bond between the touch-sensitive glass substrate and the plastic parts will not be strong enough, preferably 0.4 mm . Further, it also includes curing the compounded plastic parts 3 and the touch-sensitive glass substrate 1. The curing can be performed using a high-energy ultraviolet oven commonly used in the industry. The curing conditions are well known to those skilled in the art and will not be described here. Let me explain.

As a specific embodiment, the material of the first bonding layer 4 is one of ultraviolet curing glue, heat drying glue, quick-drying glue and silica gel; preferably, the material of the first bonding layer is ultraviolet Curing glue.

As a specific implementation manner, the composite body of the shape-changeable plastic part 3 and the touch-sensitive glass substrate 1 has a thickness of 0.5-1.5 millimeters. After the side edge of the touch-sensitive glass substrate 1 is bonded and compounded with the plastic part 3, the formed composite whole is combined with the glass film substrate 2 through the second bonding layer 5, and the side edge of the plastic part 3 is bonded to the glass film substrate 2. The side edges are basically aligned to facilitate the alignment and assembly of subsequent electronic products. When the composite whole formed by the touch-sensitive glass substrate 1 and the plastic part 3 is composited with the glass film substrate 2 , the second adhesive layer 5 can be pressed by a roller to perform the composite. Further, after compounding, put it into a pressure cooker and pressurize to remove visible air bubbles between the layers. The pressure is 0.2-1.0 MPa and the time is 10-30 minutes; preferably, the pressure is 0.5 MPa and the time is 20 minutes.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. capacitance touch screen; It is characterized in that; Comprise the glass film substrate and the touch sensible glass substrate that are oppositely arranged; The lateral edges of said touch sensible glass substrate is bonded with the plastic parts of shape variableization through first tack coat, and the plastic parts of shape variableization and touch sensible glass substrate are combined into an integral body, and this composite monolithic is through second tack coat and said glass film substrate in combination.

2. capacitance touch screen according to claim 1 is characterized in that, the thickness of said glass film substrate is the 0.03-0.4 millimeter.

3. capacitance touch screen according to claim 1 is characterized in that, the material of said glass film substrate is the compound of glass or glass and polyethylene terephthalate.

4. capacitance touch screen according to claim 1 is characterized in that the appearance of said glass film substrate is formed with surface decoration layer, and the thickness of said surface decoration layer is the 4-20 micron.

5. capacitance touch screen according to claim 1 is characterized in that, the thickness of the plastic parts of said shape variableization and touch sensible glass substrate composite monolithic is the 0.5-1.5 millimeter.

6. capacitance touch screen according to claim 1 is characterized in that, also is provided with reference column on the plastic parts of said shape variableization.

7. capacitance touch screen according to claim 1 is characterized in that, the marginal gap between said touch sensible glass substrate and the plastic parts is the 0.25-0.5 millimeter.

8. capacitance touch screen according to claim 1 is characterized in that the surface of said touch sensible glass substrate is provided with the contact induction zone, and said contact induction zone is formed by indium tin oxide electrode layer.

9. capacitance touch screen according to claim 8 is characterized in that, said indium tin oxide electrode layer is drawn through molybdenum aluminium molybdenum electrode cabling.

10. capacitance touch screen according to claim 1 is characterized in that, the material of said first tack coat is a kind of in ultraviolet curing glue, heat oven dry glue, Instant cement and the silica gel.

Images