Colored cover plate with key touch function and preparation process thereof

Abstract

The invention relates to the technical field of capacitive touch sensors, in particular to a colored cover plate with a key touch function and a preparation process of the colored cover plate, and a colored graphical user interface and a touch sensing function are realized by printing a colored ink layer, a touch sensing electrode and a lead on the basis of a glass cover plate. A color graphic panel and a touch control sensor are all integrated on the surface of cover plate glass, the thickness is reduced, the weight is reduced, a color graphic user interface and the touch control sensor do not need to use an independent PET substrate, procedures after assembly are not needed, an OCA material is not needed, a transparent conductive ink material adopted by a touch sensing electrode is lower than an ITO material in cost, and the cost of the touch sensing electrode is lower than that of a transparent conductive ink material adopted by the touch sensing electrode. And moreover, the product implementation process is simpler, the production period is short, a complete machine manufacturer only needs to purchase colored cover plate glass with a key touch control function, and the operation cost is lower.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitive touch sensors, in particular to a color cover plate with a key touch function and a preparation process thereof. Background Art

[0002] The capacitive touch control panel components of home appliances (traditional white appliances, small appliances, kitchen appliances, etc.) are usually composed of multiple components, including cover glass, color-printed film panel (a graphical interface that guides users to touch operations), and capacitive touch sensors. The whole machine manufacturer needs to purchase these parts separately.

[0003] 1. Cover glass manufacturers complete cover glass by processing the size of the glass, physically or chemically tempering it, and printing and coating it on the surface. Color panel manufacturers print color inks on PET substrates to complete color film panels, which serve as the graphical interface of the control panel; capacitive touch sensor manufacturers prepare ITO electrodes based on ITO film materials [composed of PET substrates and ITO conductive films] through etching processes, and then print and laser etch the wires to complete the sensor module. The sensor module and FPC are assembled by hot pressing using conductive adhesive ACF, and finally OCA is affixed to the surface; the structure and process are complex, the yield is low; the process cycle is long, and the manufacturing cost is high;

[0004] 2. The whole machine brand manufacturer or its entrusted solution provider has to purchase and manage the quality of multiple parts factories, which results in high management and operation costs. In particular, the cost of capacitive touch sensor materials made of independent PET film substrates and expensive ITO electrode materials is high;

[0005] The cover glass and the color film panel are assembled by OCA bonding, and finally the capacitive touch sensor is attached to the bottom layer; that is, two assemblies are required to complete the capacitive touch control panel assembly;

[0006] 3. Capacitive touch control panel components, the composite structure is thicker and heavier. Summary of the invention

[0007] The object of the present invention is to provide a color cover plate with a key touch function and a preparation process thereof, so as to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A color cover with a key touch function, comprising:

[0010] A glass cover plate, wherein a color ink layer is coated on the glass cover plate, and a touch sensing electrode is attached to the color ink layer;

[0011] There are a plurality of touch sensing electrodes, each of which is connected to a wire;

[0012] The wire is connected to the touch sensing electrode through a contact head, and the end of the wire is connected to the FPC by providing a conductive adhesive, so that the touch sensing electrode can realize a touch function;

[0013] A protective film covers the touch sensing electrodes, the wires and the color ink layer.

[0014] Preferably, the cover glass is usually made of soda-lime-silicon glass or aluminosilicate glass, with a thickness of 0.4 to 6.0 mm.

[0015] Preferably, the manufacturing material of the touch sensing electrode includes but is not limited to PEDOT conductive paste and nano silver ink, and the thickness of the touch sensing electrode is 0.1-5 um.

[0016] Preferably, the conductor material is silver paste or copper paste with a thickness of 3 to 15 um.

[0017] Preferably, the protective film uses transparent waterproof ink or PET covering film. When the protective film uses transparent waterproof ink, the thickness is 5 to 30 um; when the protective film uses PET covering film, the thickness is 50 to 150 um.

[0018] Preferably, the sheet resistance of the touch sensing electrode is 5-500Ω / □, and the effective sensing area of ​​the touch sensing electrode is ≥30mm 2 .

[0019] Preferably, the contact head has a width of 0.3-1 mm and a length of 1-100 mm.

[0020] Preferably, the wire has a line width of 0.08-0.25 mm and a line spacing of 0.08-0.35 mm.

[0021] A process for preparing the above-mentioned colored cover plate with key touch function comprises:

[0022] S1: Carve the glass into the target shape and size, and temper the glass by chemical or physical methods. After the tempering is completed, the glass cover plate is formed, and the glass cover plate is cleaned and transferred to the next process;

[0023] S2: According to the designed user graphical interface, the colored ink is applied to the non-operating surface of the cover glass by screen printing or inkjet printing; when the screen printing process is used, the colored ink is baked to solidify and adhere to the surface of the glass cover, the baking temperature is 140℃~160℃, and the baking time is 15min~40min; when the digital inkjet printing method is used, the ink is solidified by UV curing, and the UV curing energy is 2500~4000mj / cm 2 , and attached to the surface of the glass cover plate, thereby forming the color ink layer;

[0024] S3: forming the touch sensing electrode by screen printing transparent conductive ink on the color ink layer at a temperature of 120° C. to 135° C. for 15 to 20 minutes;

[0025] S4: forming the conductive wire by screen printing silver paste or copper paste and baking at a temperature of 140° C. to 160° C. for 20 to 30 minutes;

[0026] S5: ACF conductive adhesive pre-pressing, pressure: 0.15Mpa, temperature: 80℃, time: 2S;

[0027] S6: FPC and touch sensor circuit are thermally bonded, pressure: 0.2-0.3Mpa, temperature: 160°C, time: 10S;

[0028] S7: When using transparent waterproof ink for circuit encapsulation protection, screen printing ink can be used, baked and cured at a temperature of 110 to 130°C for 10 to 20 minutes; when using PET covering film for circuit encapsulation protection, roller lamination is used at a pressure of 0.1 to 0.2 MPa and a speed of 1 meter / s to form the protective film.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention relies on a glass cover plate and realizes a color graphic user interface and a touch sensing function by printing a color ink layer, a touch sensing electrode and a wire, that is, the color graphic panel and the touch sensing are all integrated into the cover glass surface, the thickness is thinned, and the weight is reduced. The color graphic user interface and the touch sensing do not need to use an independent PET substrate, do not need a post-assembly process, and do not need to use OCA materials. The transparent conductive ink material used for the touch sensing electrode is cheaper than the ITO material, and the product realization process is simpler and the production cycle is short. The whole machine manufacturer only needs to purchase a color cover glass with a key touch function, and the operating cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 The arrangement diagram of the touch sensing electrodes and the wires of the present invention;

[0033] Figure 3 It is a schematic diagram of the axonometric structure of the present invention.

[0034] In the figure: 1. Glass cover; 2. Color ink layer; 3. Touch sensing electrode; 4. Wire; 5. Contact head; 6. Conductive glue; 7. FPC; 8. Protective film. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 3 , the present invention provides a technical solution:

[0037] A color cover with a key touch function, comprising:

[0038] The glass cover plate 1, the cover plate glass is usually made of soda-lime-silicon glass or aluminosilicate glass, with a thickness of 0.4 to 6.0 mm. A color ink layer 2 is coated on the glass cover plate 1, that is, a layer of "color film" is prepared by color coating on its non-operating surface, that is, a user graphical interface is convenient for users to operate. The color ink layer 2 can be prepared using color inks commonly used in the art. Touch sensing electrodes 3 are attached to the color ink layer 2. The material of the touch sensing electrodes 3 includes PEDOT conductive paste or nano silver ink, and the thickness of the touch sensing electrodes 3 is 0.1 to 5 um.

[0039] There are several touch sensing electrodes 3, which can be designed to be 1 to 200 according to actual application requirements. The square resistance of the touch sensing electrode 3 is 5 to 500Ω / □. Each touch sensing electrode 3 is connected to a wire 4. Each unit electrode is not conductive to each other (DC 20V, insulation resistance ≥ 20MΩ). The effective sensing area of ​​the touch sensing electrode 3 is ≥ 30mm 2 , designed into a rectangle or circle, or other irregular shapes that meet the requirements of the effective sensing area.

[0040] The wire 4 is connected to the touch sensing electrode 3 through the contact head 5. Each touch sensing electrode 3 is connected to a wire 4. The contact head 5 is also the connecting area between the wire 4 and the touch sensing electrode 3. The width is 0.3-1 mm and the length is 1-100 mm. The line width of the wire 4 is 0.08-0.25 mm and the line spacing is 0.08-0.35 mm. The material of the wire 4 is silver paste or copper paste with a thickness of 3-15 um.

[0041] The end of the wire 4 is connected to the FPC 7 by providing a conductive adhesive 6, so that the touch sensing electrode 3 can realize the touch function.

[0042] The protective film 8 covers the touch sensing electrodes 3, the wires 4 and the color ink layer 2. The protective film 8 uses transparent waterproof ink or PET covering film. When the protective film 8 uses transparent waterproof ink, the thickness is 5 to 30 um. When the protective film 8 uses PET covering film, the thickness is 50 to 150 um. The protective film 8 encapsulates and protects the touch sensing electrodes 3 and the wires 4.

[0043] Process flow: the glass is finely carved into the target shape and size, and the glass is tempered by chemical or physical methods. After the tempering is completed, a glass cover plate 1 is formed, and the glass cover plate 1 is cleaned;

[0044] According to the designed user graphical interface, the colored ink is applied to the non-operating surface of the cover glass by screen printing or inkjet printing. When the screen printing process is used, the colored ink is cured by ink baking (temperature 140°C to 160°C, duration: 15min to 40min) and attached to the surface of the glass cover 1. When the digital inkjet printing method is used, the colored ink is cured by UV curing (UV curing energy: 2500 to 4000 mj / cm 2 ) and attached to the surface of the glass cover plate 1, thereby forming a color ink layer 2;

[0045] On the color ink layer 2, a transparent conductive ink is screen-printed and baked at 120°C to 135°C for 15 to 20 minutes to form a touch sensing electrode 3;

[0046] The wire 4 and the contact head 5 are formed by screen printing silver paste or copper paste and baking at 140°C to 160°C for 20 to 30 minutes;

[0047] ACF conductive glue 6 is pre-pressed (pressure: 0.15Mpa, temperature: 80°C, time: 2S) to connect the conductive glue 6 with the wire 4;

[0048] The FPC 7 is thermally bonded to the touch sensing circuit (pressure: 0.2-0.3 MPa, temperature: 160° C., time: 10 seconds) to connect the FPC 7 to the conductive adhesive 6, thereby connecting the FPC 7 to the touch sensing electrode 3;

[0049] When using transparent waterproof ink for circuit packaging protection, screen printing ink can be used and baked for curing (temperature: 110-130°C, time: 10-20min); when using PET covering film for circuit packaging protection, roller lamination is used with a pressure of 0.1-0.2Mpa and a speed of 1m / s to form a protective film 8.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A color cover with a key touch function, characterized in that: include: A glass cover plate, wherein a color ink layer is coated on the glass cover plate, and a touch sensing electrode is attached to the color ink layer; There are a plurality of touch sensing electrodes, each of which is connected to a wire; The wire is connected to the touch sensing electrode through a contact head, and the end of the wire is connected to the FPC by providing a conductive adhesive, so that the touch sensing electrode can realize a touch function; A protective film covers the touch sensing electrodes, the wires and the color ink layer.

2. The color cover with key touch function according to claim 1, characterized in that: The cover glass is usually made of soda-lime-silicon glass or aluminosilicate glass, with a thickness of 0.4 to 6.0 mm.

3. The color cover with key touch function according to claim 2, characterized in that: The manufacturing material of the touch sensing electrode includes but is not limited to PEDOT conductive paste and nano silver ink, and the thickness of the touch sensing electrode is 0.1-5 um.

4. The color cover with key touch function according to claim 3, characterized in that: The conductor material is silver paste or copper paste with a thickness of 3 to 15 um.

5. The color cover with key touch function according to claim 4, characterized in that: The protective film uses transparent waterproof ink or PET covering film. When the protective film uses transparent waterproof ink, the thickness is 5 to 30 um; when the protective film uses PET covering film, the thickness is 50 to 150 um.

6. The color cover with key touch function according to claim 5, characterized in that: The square resistance of the touch sensing electrode is 5-500Ω / □, and the effective sensing area of ​​the touch sensing electrode is ≥30mm 2 .

7. The color cover with key touch function according to claim 6, characterized in that: The contact head has a width of 0.3-1 mm and a length of 1-100 mm.

8. The color cover with key touch function according to claim 7, characterized in that: The wire has a line width of 0.08-0.25 mm and a line spacing of 0.08-0.35 mm.

9. A process for preparing the color cover with key touch function as claimed in any one of claims 1 to 8, characterized in that: include: S1: Carve the glass into the target shape and size, and temper the glass by chemical or physical methods. After the tempering is completed, the glass cover plate is formed, and the glass cover plate is cleaned and transferred to the next process; S2: According to the designed user graphical interface, color ink is applied to the non-operating surface of the cover glass by screen printing or inkjet printing; When the screen printing process is used, the colored ink is baked to solidify and adhere to the surface of the glass cover plate, the baking temperature is 140° C. to 160° C., and the baking time is 15 min to 40 min; When using digital inkjet printing, use UV curing to cure the ink. UV curing energy: 2500-4000mj / cm 2 , and attached to the surface of the glass cover plate, thereby forming the color ink layer; S3: forming the touch sensing electrode by screen printing transparent conductive ink on the color ink layer at a temperature of 120° C. to 135° C. for 15 to 20 minutes; S4: forming the conductive wire by screen printing silver paste or copper paste and baking at a temperature of 140° C. to 160° C. for 20 to 30 minutes; S5: ACF conductive adhesive pre-pressing, pressure: 0.15Mpa, temperature: 80℃, time: 2S; S6: FPC and touch sensor circuit are thermally bonded, pressure: 0.2-0.3Mpa, temperature: 160°C, time: 10S; S7: When using transparent waterproof ink for circuit packaging protection, screen printing ink can be used, and baking and curing can be carried out at a temperature of 110-130°C for 10-20 minutes; When the PET covering film is used for circuit packaging protection, roller lamination is adopted with a pressure of 0.1-0.2 MPa and a speed of 1 m / s to form the protective film.

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