CN103129073B - Device with multiple printing layers and printing method thereof - Google Patents

Abstract

The invention discloses a device with a plurality of printing layers and a printing method thereof, wherein the method comprises the following steps: the printing method comprises the following steps of sequentially laminating and printing at least one printing layer with the area from small to large on a protective base material, wherein the protective base material is provided with an outward exposed open surface and an attaching surface attached to another plate, and the printing layer is printed on part of the attaching surface and has a smaller printing area closer to the attaching surface, so that the height difference between layers of the printing layer is reduced, and the subsequent attaching is facilitated.

Description

Device with multi-layer printing layer and printing method thereof

technical field

The present invention relates to a device with a printing layer and a printing method thereof, more particularly, to a device with multiple printing layers and a printing method thereof.

Background technique

With the upsurge of smart phones and tablet computers in recent years, the demand for touch panels in the application of such handheld electronic devices is in short supply, prompting the industry to continuously develop and improve related process technologies in order to reduce production costs and provide more High production capacity.

Generally speaking, a touch panel needs to add a layer of reinforced cover glass (coverglass/lens) to protect the underlying touch sensor from scratches, fingerprints and stains. In addition, since the cover glass is especially used in the touch and display of handheld electronic devices, it must also have the characteristics of thinness, pressure resistance, drop resistance, and high light transmittance.

Traditionally, various components in a handheld electronic device (including a display panel, a touch panel, and a protective glass, etc.) are assembled through a frame. However, due to the strong demand of today's consumer hand-held electronic devices (especially smart phones), the industry has adopted a large number of bezel-less appearance designs in order to further reduce the size of electronic devices by omitting bezel components. Overall weight and dimensions.

Under the aforementioned frameless design, bonding of the protective glass and the underlying touch panel is a key technology, and whether the bonding between the two is good or bad will affect the yield rate of the final product. Especially in the frameless exterior design, as shown in Figure 1, which is a top view of the appearance of a smart phone at present, the designer usually needs to design the electronic device in order to meet the design requirements of the overall appearance and color configuration. In this example, the method is to first print a layer of predetermined frame graphics 110 on the protective glass 100 with printing ink, and then print the entire piece of protective glass 100 with the frame graphic The side of the panel is fully attached to the touch panel (not shown). In this way, the transparent area on the cover glass 100 that is not printed with the frame pattern is used as the touch area 101 , and the frame pattern 110 enables the finished product to achieve the design sense that the designer wants to present to the user.

Referring now to FIG. 2 , it is a partial cross-sectional view of a liquid crystal display device in the conventional technology, showing a state in which a panel 200 printed with a printing layer 210 is attached to a plate 220 (such as the upper polarizer). As shown in the figure, the panel 201 is pre-printed with a printing layer 210 (such as printing ink) as a frame pattern, and it will be attached to the board 220 through an adhesive layer 230 . In this example, since the printed layer 210 is separated between the panel 200 and the board 220 , it is difficult to grasp the yield of the laminating process due to the different height differences between the printed layers 210 during lamination. In order to design changes or to make the color O.D value (optical density) of the border graphics meet the designer's requirements, it is often necessary to print several layers of printing layers on the substrate, as shown in the panel 200 in Figure 2. That is, four different printing layers 210 are laminated and printed in descending order of area. In practice, the more printing layers used for the border graphics, the more obvious the difference in height between layers will be, which is not conducive to the subsequent precise lamination process. Furthermore, during the lamination of the printed layer printed by the above-mentioned layered printing method and the panel, it is easy to produce obvious bumps at the junction of each printed layer due to the problem of ink accumulation, which further enlarges the average height difference of the printed layer structure and corrupt the intended border graphics.

Therefore, in order to improve the lamination yield of the rear cover glass of the touch panel, the industry urgently needs to develop a new printing technology and lamination process to solve the deficiencies in the above-mentioned known technologies.

Contents of the invention

In view of the deficiencies in the above-mentioned known technologies, one of the objects of the present invention is to provide a device with multi-layer printing layers, which are sequentially laminated and printed on the protective surface in order of increasing area. On the bonding surface of the substrate, it can produce a protective substrate with a small difference in height of the printing layer, so as to improve the yield rate of the subsequent bonding process and improve the color O.D value of the border graphics.

Another object of the present invention is to provide a printing method for multi-layer printing layers. The layer-to-layer height difference of the printing layers printed by the method is small, which is beneficial to improve the yield rate of the subsequent bonding process.

According to an embodiment of the present invention, it discloses a device with multi-layer printing layers, which includes a protective substrate, which has an open surface exposed to the outside and a bonding surface to be bonded to another plate; and At least one printing layer is sequentially laminated and printed on the part of the bonding surface of the protective substrate, wherein the printing layer closer to the bonding surface has a smaller printing area.

According to another embodiment of the present invention, it discloses a printing method of a multi-layer printing layer. The method includes sequentially stacking and printing at least one layer with an area ranging from small to large on the bonding surface of the protective substrate. A printing layer, wherein the protective base material has an open surface exposed outward and a bonding surface that is bonded to another plate, and the printing layer is printed on a part of the bonding surface and is closer to the bonding surface The joint surface has a smaller printing area.

Through the printing design of the printing layer from small to large according to the area, the height difference between the printing layers can be effectively reduced, which is beneficial to the subsequent lamination with the board.

No doubt these and other objects of the invention will become more apparent upon reading the following detailed description of the preferred embodiment which is described with various drawings and drawings.

Description of drawings

This specification contains drawings and constitutes a part of this specification, so that readers can have a further understanding of the embodiments of the present invention. The drawings illustrate some embodiments of the invention and, together with the description herein, explain its principles. In these illustrations:

FIG. 1 is a top view of the appearance of a known smart phone.

FIG. 2 is a schematic cross-sectional view of part of a liquid crystal display device in the conventional technology.

3 is a schematic cross-sectional view of a device with multiple printing layers according to an embodiment of the present invention.

Fig. 4 depicts a top view of the part of the printing layer of several layers according to the embodiment of the present invention after the protective substrate is actually bonded to the board.

FIG. 5 and FIG. 6 are schematic diagrams of the height difference distribution of printed layers printed by the layered printing method of increasing area from large to small according to the prior art and the layering printing method of increasing area from small to large according to the technology of the present invention.

FIG. 7 is a process flow of a printing method of a multi-layer printing layer according to an embodiment of the present invention.

Wherein, the reference signs are explained as follows:

100...protective glass, 101...touch area, 110...frame graphics, 200...panel, 210...printing layer, 220...plate, 230...adhesive layer, 300. ..Protection substrate, 300a...frame area, 300b...non-frame area, 302...open side, 303...fitting side, 310...printed layer, 310a...printed layer, 310b...printing layer, 320...plate, 330...adhesive layer, 401...touch area, 410...printing layer, 410a...area, 410b...area, 700.. .Process, 701...Step Block, 702...Step Block, 703...Step Block

detailed description

Please refer to FIG. 3 , which is a schematic cross-sectional view of a device with a multi-layer printing layer according to an embodiment of the present invention, which depicts a state where the protective substrate 300 is attached to a plate 320 (such as an upper polarizer in a display panel) . In this embodiment, the protective substrate 300 is used as a protective layer to protect the lower plate 320 (such as a touch substrate with a touch sensing layer or an upper polarizer of a display panel), and its material can be transparent. glass (such as a protective glass) or plastic. As shown in the figure, the protective substrate 300 is divided into a frame area 300a and a non-frame area 300b surrounded by the frame area. The frame area 300a is a graphic area, which can be printed with opaque ink graphics to Define the frame of the device or give the device a change in color scheme. The non-frame area 300b is the touch area of the entire substrate, without any graphics printed on it, so that the image information can be presented to the user. The protective substrate 300 has an open surface 302 exposed outward and a bonding surface 303 to be bonded to the plate 320 . The open surface 302 will be exposed outside the device after the protective substrate 300 is pasted and assembled, and several layers of printing layers 310 are stacked on the bonding surface 303, and the several layers of printing layers 310 can be ink layers, They are sequentially printed on the frame area 300 a of the bonding surface 303 of the protection substrate 300 in a stacked printing manner in order of increasing area. The non-frame area 300b of the open surface 302 is a touch area, which can be used by the user to draw or click on it with a finger or a stylus to achieve a control effect. During the bonding process, the protective substrate 300 is fully bonded to the lower board 320 through an adhesive layer 330 . In one embodiment, the protective substrate 300 further includes a touch sensitive layer, which is formed on the non-frame area 300b (ie, the touch area) of the bonding surface 303 of the protective substrate 300, thereby To form a touch panel with touch function integrated on the protective base material, in the bonding process, it is bonded to the lower plate material 320 (such as the upper polarizer in the display panel) through an adhesive layer 330 .

Now please refer to FIG. 4 , which depicts a partial top view of several printing layers according to an embodiment of the present invention after the protective substrate is actually bonded to the plate. It can be seen from the figure that the laminated printing layer 410 will present a border state from the perspective of the open surface of the substrate, wherein, the area where the printing layer 410 is more laminated (such as the area 410b, which includes two laminated layers) It will show a darker and denser color than the area with fewer layers (such as area 410a, only one layer), which means that its O.D value (optical density) is higher, and the edge area with more layers is printed The darker the color, the middle transparent area without any printing layer is used as the touch area 401 . It should be noted that in other invention states, the printed layer may also exhibit a color layer distribution state different from that of this embodiment, such as a color layer distribution state that is shallow on the outside and dark on the inside, or irregularly divided. The end view design depends on the design of the operator. By controlling the stacking arrangement and distribution of the printing layers above, the designer can design a frame state with rich colors and changing shapes on the substrate surface.

The feature of the present invention is that several layers of printing layers arranged on the protective substrate are sequentially stacked and printed on the bonding surface of the substrate in order of increasing area, which is different from that of the known technology in order of increasing area. The traditional practice of small sequential layer printing is reversed. As far as the present invention is concerned, referring again to FIG. 3 , the practice of printing a printing layer with a smaller area (such as 310a) in advance during printing can make the printing layer (such as 310b) printed subsequently take the previous layer of printing layer as a support The structural basis is used to print, so that the subsequent printing and the larger printing layer can be distributed along the surface of the front printing layer, so that the overall slope of the printing layer tends to be gentle, and there is no such thing as in the previous technology. The abrupt height difference structure distribution shown in Figure 2 may easily produce bumps.

Now please refer to Fig. 5 and Fig. 6, which are the printing layers printed according to the layered printing method with the area from large to small in the prior art and the layered printing method with the area from small to large in the technology of the present invention Schematic diagram of the height difference distribution between layers. From the comparison of Figure 5 and Figure 6, it can be seen that the printed layer structure obtained by the stack printing method of the prior art will have a large interlayer height difference h ₁ (such as 2.98 μm), in comparison, the present invention On average, the printed layer structure obtained by this method has a relatively small height difference h ₂ (eg, 0.79 μm). Furthermore, the layer-to-layer waviness of the laminated structure printed by the prior art method is relatively steep, while the layer-to-layer waviness of the laminated structure printed by the method of the present invention is relatively gentle. The comparison of these two figures proves that the protective substrate with printed layer patterns obtained by the printing method of the present invention will have better yield performance in the subsequent bonding process.

Please refer now to FIG. 7 , which is a flow 700 of a printing method for a multi-layer printing layer according to an embodiment of the present invention. First, in step block 701, a protective base material is provided as a protector for the lower plate, and the protective base material has an open surface to be exposed to the outside and a bonding surface to be bonded to another plate, which The material can be transparent glass or plastic, which has the characteristics of lightness, pressure resistance, drop resistance, and high light transmittance. Next, in step block 702 , at least one printing layer with an area ranging from small to large is sequentially laminated and printed on the bonding surface of the part of the protective substrate. The printing layer is used as a frame pattern to distinguish it from the transparent touch area of the protective substrate.

In a further embodiment of the present invention, as shown in step block 703, after the printing layer is printed, the protective substrate with the multi-layer printing layer is further laminated with another plate in an all-round way . The bonding step may be carried out by applying a layer of adhesive on the board and then pressing it and the protective substrate to each other. After lamination, the stacked multi-layer printing layers will present a frame state from the perspective of the open surface of the substrate.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1. there is a device for multi-sheet printed layer, it is characterized in that, comprising:

One protection base material, has the binding face that an outwards exposed open surface and one and another sheet material are fitted; And

At least one printed layers, sequentially on the stacking described binding face being printed on the part of described protection base material, wherein more has less printing area close to the described printed layers of described binding face.

2. there is the device of multi-sheet printed layer as claimed in claim 1, it is characterized in that, described protection base material is divided into a rim area and one by this rim area around non-rim area, described printed layers is printed on rim area in order to as frame figure.

3. have the device of multi-sheet printed layer as claimed in claim 2, it is characterized in that, comprise a touch-control sensing layer further, described touch-control sensing layer is formed on the non-rim area of described protection base material binding face.

4. have the device of multi-sheet printed layer as claimed in claim 1, it is characterized in that, described protection base material is the cover glass of a contact panel.

5. there is the device of multi-sheet printed layer as claimed in claim 1, it is characterized in that, described sheet material be have in contact panel a touch-control sensing layer touch base plate or be the upper polaroid of a display floater.

6. have the device of multi-sheet printed layer as claimed in claim 1, it is characterized in that, described printed layers is ink layer.

7. a printing process for multi-sheet printed layer, is characterized in that, comprising:

A protection base material sequentially stackingly stamps area at least one printed layers from small to large; wherein said protection base material has the binding face that an outwards exposed open surface and one and another sheet material are fitted, and the described binding face that described printed layers is printed on part more has less printing area close to described binding face.

8. the printing process of multi-sheet printed layer as claimed in claim 7, is characterized in that, is more included in after stamping described printed layers, is comprehensively fitted with another sheet material described by the binding face of the described protection base material with described at least one printed layers.

9. the printing process of multi-sheet printed layer as claimed in claim 7, is characterized in that, described protection base material be divided into a rim area and one by this rim area around non-rim area, described printed layers is printed on rim area in order to as frame figure.

10. the printing process of multi-sheet printed layer as claimed in claim 9, is characterized in that, comprises formation one touch-control sensing layer further in the non-rim area of described protection base material binding face.

The printing process of 11. multi-sheet printed layers as claimed in claim 7, is characterized in that, described protection base material is the cover glass in a contact panel.

The printing process of 12. multi-sheet printed layers as claimed in claim 7, is characterized in that, described sheet material be have in a contact panel touch-control sensing layer touch base plate or be the upper polaroid of a display floater.