Touch key film and display module

Abstract

The utility model discloses a touch control button film and display module relates to film button field, touch control button film includes the substrate layer, circuit diagram layer, insulating layer and smoked OCA layer from bottom to top stack in proper order, the circuit diagram layer is printed on the surface of substrate layer, insulating layer cover circuit diagram layer, substrate layer includes button area and lead area, and the button area and the lead area are in the same layer. The smoked OCA covers the key area, and a diffusion ink layer is arranged on one surface, deviating from the circuit diagram layer, of the base material layer; according to the utility model, the smoked OCA layer and the diffusion ink layer are simultaneously arranged on the touch key film, and after the touch key film is attached to the cover plate on the display module, the smoked OCA layer has a hiding effect on the key position of the cover plate, so that the use of a diffusion plate is reduced, the attaching process is reduced, the material cost is reduced, the ink silk-screen printing process of the cover plate is saved, and the production efficiency is improved. The production efficiency is greatly improved, the production efficiency is high, machining and assembling are convenient, mass production can be achieved, the production cost is reduced, and the product competitiveness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of membrane keys, in particular to a touch key membrane and a display module. Background Art

[0002] With the development of touch display technology, TDDI touch display integrated modules have become the mainstream. The display VA and touch VA of existing TDDI touch display panels are the same size, and the touch buttons outside the viewing area need to be designed with special touch sensors, such as touch membrane buttons. For example, application number CN201820677578.4 discloses a touch-sensitive membrane key structure, which includes a PET base layer and a cover plate, a semi-transparent key pattern is silk-screened on the lower surface of the cover plate, a layer circuit is printed on the upper surface of the PET base layer, an OCA or double-sided adhesive is arranged between the layer circuit and the key pattern, the layer circuit is a silver paste layer circuit, the silver paste layer circuit is led to the edge of the PET base layer through a silver paste routing, and carbon paste is coated on the silver paste routing at the edge of the PET base layer; black ink or white ink is coated on the lower surface of the cover plate except for the key pattern and the visible area, and the silver paste layer circuit obtained by the yellow light process on the PET base layer in this scheme is not easy to fall off, and the performance may be good; after the carbon paste layer is coated on the silver paste routing, it is plug-in connected to the mainboard, which improves the wear resistance of the plug-in point and increases the reliability of the electrical connection point. However, the structure of the touch film key is to use a transparent double-sided adhesive key film, which is attached to the bottom of the hidden key of the cover plate, and a diffusion plate is required above the key backlight to achieve the uniformity of the key brightness. The assembly process is relatively complicated, the production efficiency is low, it is difficult to achieve mass production, the cost is high, and it is not conducive to product competition. Therefore, the utility model discloses a touch key film to solve the above problems. Utility Model Content

[0003] Based on this, it is necessary to provide a touch button film and display module to address the above technical problems, and to make the smoked OCA and the diffused ink layer on the touch button film at the same time. The smoked OCA blocks and hides the upper surface of the touch button film. When the backlight source is irradiated, the diffused ink layer on the lower surface is used to diffuse light, thereby ensuring the brightness uniformity of the key area and reducing the use of the diffuser plate. During production and preparation, the smoked OCA can be laminated to the membrane key in large pieces. Compared with the single-grain silk-screen hidden ink of the cover plate, the silk-screen printing process of the cover plate ink is saved, and the production efficiency is greatly improved. Moreover, the diffused ink layer can be silk-screened in large pieces on the lower surface of the key film and then cut into single grains, with high production efficiency. The utility model has a simple process and is easy to process and assemble, which greatly improves the production efficiency, can achieve mass production, reduces production costs, and improves product competitiveness.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A touch key film comprises a substrate layer, a circuit layer, an insulating layer and a smoked OCA layer stacked in sequence from bottom to top, the circuit layer is printed on the surface of the substrate layer, the insulating layer covers the circuit layer, the substrate layer comprises a key area and a lead area, the smoked OCA covers the key area, and a diffusion ink layer is provided on a surface of the substrate layer away from the circuit layer.

[0006] As a preferred embodiment of the touch key film provided by the utility model, a surface of the smoked OCA facing away from the substrate layer is provided with release paper.

[0007] As a preferred implementation of the touch key film provided by the utility model, a tear handle is provided on the release paper.

[0008] As a preferred implementation of the touch key film provided by the utility model, the circuit layer is a silver paste layer circuit, and the silver paste layer circuit is led to the edge of the substrate layer through silver paste routing.

[0009] As a preferred implementation of the touch key film provided by the utility model, the silver paste wiring at the edge of the substrate layer is coated with a carbon coating, and the carbon coating seals the end surface of the silver paste wiring.

[0010] As a preferred embodiment of the touch key film provided by the utility model, a reinforcing plate is fixed to a side of the substrate layer facing away from the circuit layer, and the reinforcing plate is arranged at an end of the substrate layer with the carbon coating.

[0011] As a preferred implementation of the touch key film provided by the utility model, the smoked OCA extends to cover the lead area.

[0012] As a preferred implementation of the touch key film provided by the utility model, the connection corner between the key area and the lead area of ​​the substrate layer is an arc angle.

[0013] As a preferred implementation of the touch key film provided by the utility model, the key area of ​​the substrate layer is provided with a hollow groove, and the smoked OCA avoids the hollow groove.

[0014] The utility model also provides a display module, which comprises a cover plate and the above-mentioned touch key film, wherein the cover plate comprises a visible area and a non-visual area, and the key area of ​​the touch key film is located in the non-visual area.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The touch key film provided by the utility model has the smoked OCA and the diffused ink layer made on the touch key film at the same time. The smoked OCA blocks and hides the upper surface of the touch key film. When illuminated by the backlight, the diffused ink layer on the lower surface is used to scatter light, thereby ensuring the brightness uniformity of the key area and reducing the use of the diffuser plate. During production and preparation, the smoked OCA can be laminated to the film key in large pieces. Compared with the single-grain silk-screen hidden ink of the cover plate, the silk-screen printing process of the cover plate ink is saved, and the production efficiency is greatly improved. Moreover, the diffused ink layer can be silk-screened in large pieces on the lower surface of the key film and then cut into single grains, with high production efficiency. The utility model has a simple process and is easy to process and assemble, thereby greatly improving production efficiency, enabling mass production, reducing production costs, and improving product competitiveness.

[0017] 2. The display module provided by the utility model has the smoked OCA and the diffusion ink layer made on the touch button film at the same time. After the touch button film is bonded to the cover plate on the display module, the key area is located at the transparent key position of the cover plate, the smoked OCA is bonded to the cover plate, and has a hiding effect on the key position of the cover plate. The setting of the diffusion ink layer has a light diffusion effect, ensuring that the brightness of the cover plate is uniform at the key position. There is no need to add an additional diffusion plate, which reduces material costs and reduces the bonding process, further improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic side view of the overall structure of the touch key membrane provided by the utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the touch key membrane provided by the utility model;

[0021] Figure 3 A schematic plan view of a cover plate in a display module provided by the utility model;

[0022] Figure 4 This is a plan view of the connection between the cover plate and the touch key film in the display module provided by the utility model.

[0023] The markings in the figure are as follows:

[0024] 1. Substrate layer; 101. Key area; 102. Lead area; 2. Circuit layer; 3. Insulation layer; 4. Smoked OCA layer; 5. Diffusion ink layer; 6. Carbon coating; 7. Reinforcement plate; 8. Cover plate; 801. Visible area; 802. Non-visible area; 9. Release paper; 10. Tear handle; 11. Hollow groove; 12. Arc corner. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0026] As described in the background technology, the structure of the existing touch film button adopts a transparent double-sided adhesive button film, which is attached under the hidden button of the cover plate, and a diffusion plate is required above the button backlight source to achieve uniform brightness of the button. The assembly process is relatively complicated, the production efficiency is low, it is difficult to achieve mass production, the cost is high, and it is not conducive to product competition.

[0027] In order to solve this technical problem, the utility model provides a touch key film and a display module, which are applied in the field of display modules.

[0028] Specifically, please refer to Figure 1-2 The touch key film specifically includes a substrate layer 1, a circuit layer 2, an insulating layer 3 and a smoked OCA layer 4 stacked in sequence from bottom to top, the circuit layer 2 is printed on the surface of the substrate layer 1, the insulating layer 3 covers the circuit layer 2, the substrate layer 1 includes a key area 101 and a lead area 102, the smoked OCA layer 4 covers the key area 101, and a diffusion ink layer 5 is provided on a surface of the substrate layer 1 away from the circuit layer 2.

[0029] To achieve the above purpose, please refer to Figure 3-4 The utility model further provides a display module, which includes a cover plate 8 and the above-mentioned touch key film, wherein the cover plate 8 includes a visible area 801 and a non-visual area 802 , and the key area 101 of the touch key film is located in the non-visual area 802 .

[0030] The touch key film and display module provided by the utility model have the smoked OCA layer 4 and the diffused ink layer 5 simultaneously formed on the touch key film, the smoked OCA layer 4 blocks and hides the upper surface of the touch key film, and when irradiated by the backlight source, the diffused ink layer 5 on the lower surface is used to scatter light, thereby ensuring the brightness uniformity of the key area 101 and reducing the use of the diffuser plate. During production and preparation, the smoked OCA layer 4 can be laminated to the film key in large pieces, compared with the single-grain silk-screen hidden ink of the cover plate 8, the silk-screen printing process of the ink of the cover plate 8 is saved, and the production efficiency is greatly improved. Moreover, the diffused ink layer 5 can be silk-screened in large pieces on the lower surface of the key film and then cut into single grains, with high production efficiency. The utility model has a simple process and is easy to process and assemble, thereby greatly improving production efficiency, enabling mass production, reducing production costs, and improving product competitiveness.

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] Example 1

[0035] Please refer to Figure 1-2 A touch key film is provided, which includes a substrate layer 1, a circuit layer 2, an insulating layer 3 and a smoked OCA layer 4 stacked in sequence from bottom to top, the circuit layer 2 is printed on the surface of the substrate layer 1, the insulating layer 3 covers the circuit layer 2, the substrate layer 1 includes a key area 101 and a lead area 102, the smoked OCA layer 4 covers the key area 101, and a diffusion ink layer 5 is provided on a surface of the substrate layer 1 away from the circuit layer 2.

[0036] The substrate layer 1 is PET, which is a conventional and commonly used material with the characteristics of being soft and easy to bend. The substrate layer 1 is in a T-shaped structure. The lead area 102 is the long neck area of ​​the substrate layer 1. The circuit layer 2 is located in the key area 101 and is provided with a key pattern. The pattern is set according to actual usage requirements. The circuit layer 2 is a silver paste layer circuit. The silver paste layer circuit is led to the edge of the substrate layer 1 through the silver paste routing. Specifically, the silver paste routing extends to the lead area 102 of the substrate layer 1 away from the key area 101. The silver paste layer circuit is made of nano-scale silver paste particles through a yellow light process. After the silver paste layer is completed on the surface of the substrate layer 1, a layer of polyimide is coated on the surface of the circuit layer 2 to form an insulating layer 3, which can effectively protect the circuit layer 2 and ensure insulation.

[0037] The silver paste traces at the edge of the substrate layer 1 are coated with a carbon coating 6, which seals the end face of the silver paste traces. The carbon paste in the carbon coating 6 has excellent wear resistance and conductivity, and can protect the silver paste traces from oxidation. In addition, a reinforcing plate 7 is fixed to the side of the substrate layer 1 away from the circuit layer 2. The reinforcing plate 7 is arranged at the end of the substrate layer 1 with the carbon coating 6. The silver paste traces are led out from the reinforcing plate 7. The arrangement of the reinforcing plate 7 facilitates the plugging of the touch key film with the mainboard. In addition, a sensor is also arranged in the key area 101 of the substrate layer 1, and the sensor is electrically connected to the circuit layer 2.

[0038] The diffusion ink layer 5 is arranged in the key area 101 of the substrate layer 1. A layer of diffusion ink is screen-printed on the side of the substrate layer 1 using a screen printing process to form a diffusion ink layer 5. When screen printing the diffusion ink, the entire substrate layer 1 is screen-printed. After the screen printing is completed, it is cut into the designed size specifications. This large-area screen printing method can not only greatly improve the processing efficiency, but also reduce the screen printing error and the screen printing uniformity of the diffusion ink, thereby improving the screen printing effect and ensuring the astigmatism effect.

[0039] After the touch key film is processed, the touch key film is assembled with the cover plate 8 to form a display module structure, such as Figure 3-4 As shown, specifically, the cover 8 includes a visible area 801 and a non-visual area 802, and the smoked OCA layer 4 of the touch key film is bonded to the non-visual area 802 of the cover 8. The cover 8 is a transparent plate made of glass. At the same time, a key icon is silk-screened on the cover 8, and the key icon corresponds to the key pattern on the circuit layer 2. After the touch key film is bonded to the cover 8, the touch key film is plugged into the mainboard to form an electrical connection.

[0040] Example 2

[0041] The touch key film provided in Example 1 is further optimized, specifically, as follows: Figure 1-2As shown, a surface of the smoked OCA layer 4 facing away from the substrate layer 1 is provided with a release paper 9, and a tear handle 10 is provided on the release paper 9. After the smoked OCA layer 4 is attached to the key area 101 of the substrate layer 1 as a whole, when it is necessary to fit the touch key film to the cover plate 8, the release paper 9 is torn off by the tear handle 10. The tear handle 10 is provided at a corner at one end of the release paper 9, and the tear handle 10 is colored, which may be red, yellow or other colors that are easy to distinguish, for easy identification.

[0042] Example 3

[0043] The touch key film provided in Example 2 is further optimized. Specifically, Figure 2 As shown, the key area 101 is provided with four key patterns, and they are distributed on both sides. A hollow groove 11 is provided in the middle of the key area 101, and the smoked OCA layer 4 avoids the hollow groove 11. The cover plate 8 is also a hollow structure at the same position. The hollow layer is used to install a physical knob or a main screen button in a mobile phone. At the same time, the connection corner between the key area 101 and the lead area 102 of the substrate layer 1 is an arc angle 12, which avoids the problem of tearing at the connection when the lead area 102 is bent, and improves the strength of the connection corner between the key area 101 and the lead area 102 of the substrate layer 1. In addition, the smoked OCA layer 4 extends to cover the lead area 102, and the extension length is 2-5mm. The junction of the key area 101 and the lead area 102 is bonded and fixed to the cover plate 8 to avoid reciprocating bending at the junction, so as to improve the service life.

[0044] The working principle of the touch key film and display module provided by the utility model is as follows: the smoked OCA layer 4 and the diffused ink layer 5 are made on the touch key film at the same time. After the touch key film is bonded to the cover plate 8 on the display module, the key area 101 is located at the transparent key position of the cover plate 8. The smoked OCA layer 4 is bonded to the cover plate 8 and has a hiding effect on the key position of the cover plate 8. When the backlight source is irradiated, the diffused ink layer 5 on the lower surface is used to scatter light, thereby ensuring the brightness uniformity of the key area 101, reducing the use of the diffuser plate, reducing the bonding process, and reducing material costs. During production and preparation, the smoked OCA layer 4 can be bonded to the film key in large pieces. Compared with the single-grain silk-screen hidden ink of the cover plate 8, the silk-screen printing process of the ink of the cover plate 8 is saved, and the production efficiency is greatly improved. Moreover, the diffused ink layer 5 can be silk-screened in large pieces on the lower surface of the key film and then cut into single grains, with high production efficiency. The utility model has a simple process and is easy to process and assemble, which greatly improves the production efficiency, can achieve mass production, reduces production costs, and improves product competitiveness.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A touch key film, characterized in that: It includes a substrate layer, a circuit layer, an insulating layer and a smoked OCA layer stacked in sequence from bottom to top, the circuit layer is printed on the surface of the substrate layer, the insulating layer covers the circuit layer, the substrate layer includes a key area and a lead area, the smoked OCA covers the key area, and a diffusion ink layer is provided on a surface of the substrate layer away from the circuit layer.

2. A touch key film according to claim 1, characterized in that: A surface of the smoked OCA facing away from the substrate layer is provided with release paper.

3. The touch key film according to claim 2, characterized in that: A tearing handle is provided on the release paper.

4. The touch key film according to claim 1, characterized in that: The circuit layer is a silver paste layer circuit, and the silver paste layer circuit is led to the edge of the substrate layer through silver paste routing.

5. The touch key film according to claim 4, characterized in that: The silver paste wiring at the edge of the substrate layer is coated with a carbon coating, and the carbon coating seals the end surface of the silver paste wiring.

6. The touch key film according to claim 5, characterized in that: A reinforcing plate is fixed on a side of the substrate layer facing away from the circuit layer, and the reinforcing plate is arranged at one end of the substrate layer with the carbon coating.

7. The touch key film according to claim 1, characterized in that: The smoked OCA extends to cover the lead area.

8. The touch key film according to claim 1, characterized in that: The connection corner between the key area and the lead area of ​​the substrate layer is an arc angle.

9. The touch key film according to claim 1, characterized in that: The key area of ​​the substrate layer is provided with a hollow groove, and the smoked OCA avoids the hollow groove.

10. A display module, characterized in that: It comprises a cover plate and the touch key film according to any one of claims 1 to 9, wherein the cover plate comprises a visible area and a non-visual area, and the key area of ​​the touch key film is located in the non-visual area.

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