TW201716954A - Display panel structure provided with hidden blind hole and manufacturing method thereof - Google Patents

Abstract

The invention provides a display panel structure provided with a hidden blind hole and a manufacturing method thereof. A transparent substrate is provided with the blind hole and a visible area, a covering element is arranged on the visible area, printing ink is sprayed onto the surface of the photo-permeable substrate with the covering element as a mask so that a decorative layer can be formed on the inner surface of the blind hole and around the visible area, and the covering element is removed at last so that a required decorative layer pattern can be obtained. The decorative layer manufactured with the spraying technique is more uniform and efficient. Manufacturing processes are simplified, yield is increased, and manufacturing cost can be reduced.

Description

Display panel structure with hidden blind holes and manufacturing method thereof

The invention relates to a display panel structure and a manufacturing method thereof, in particular to a hidden blind hole display panel structure and a manufacturing method thereof.

With the continuous development and advancement of digital technology, various information processing devices are booming at an alarming rate. Various types of multimedia provide rich digital information in life at any time. Under the wave of digital information, touch panels Application has long been the focus of many parties, and it is also the peak of new technology that the industry competes with each other and technology development. With the introduction of 3D small LCD panels for PDAs and mobile phones, and medium-sized LCD panels of more than 10 inches for industrial equipment and business terminal products, the application range of touch panels has gradually expanded, and some have even extended to 10吋. The field of the above large panels. At present, the touch-type mobile phone is a popular electronic product. The touch-type mobile phone generally engages a cover glass (Cover Glass) with a display panel, wherein the glass cover is provided with a decorative layer on the surface of the display panel (decoration) The layer is used to shield the non-display area of the display panel to prevent the user from directly seeing the non-display area of the display panel through the glass cover.

The method of forming a decorative layer on the glass cover is generally a screen printing ink. Since the function key pattern on the mobile phone panel needs to have a color difference with the surrounding decorative layer, for example, the function key pattern is gray, that is, black ink. The thickness is small, and the surrounding finish is black, that is, the thickness of the black ink is large; therefore, it is necessary to perform multiple screen printing processes to form a decorative layer of different thickness, which is quite time consuming. In addition, please refer to FIG. 1A and FIG. 1B simultaneously, which are respectively a schematic diagram of the prior art glass cover structure and a structural schematic diagram of forming a recessed hole in the glass cover plate. First, a glass cover 10 is made to have a thickness of about 500 μm. The mobile phone sometimes needs to have a specific mechanism design on the panel, such as a recessed hole, that is, a specific mechanism design required for the function key pattern; as shown in FIG. 1B, The touch component 12 is limited to the process limitation of the glass cover 10, and the touch signal cannot be effectively detected. Therefore, the recessed hole 14 must be designed at the relative position of the touch component 12, and the thinned component is located on the touch component. The thickness of the 12-position glass cover 10, for example, the thickness of the thinned glass cover 10 is less than 300 μm, enabling the touch element 12 to perform touch sensing. However, when the screen printing technology is used to carry out the ink, the function key pattern on the mobile phone panel needs to be printed with the surrounding decorative layer 16 due to the problem that the printing is not possible in the concave hole, so the screen printing ink of the other way must be additionally applied to the concave hole. Not only the process is complicated but the process yield is low. Therefore, how to make a decorative layer design with a desired pattern more efficiently is an urgent problem to be solved.

In view of the above, the present invention is directed to the absence of the prior art described above, and provides a display panel structure with hidden blind holes and a manufacturing method thereof to effectively overcome the above problems.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a patterned structure on a transparent substrate and a blind hole inner surface on a non-display area by a spray printing technique, which is not only simple to manufacture but also high in product reliability.

Another object of the present invention is to provide a novel structure that uses a spray printing technique to make a transparent substrate surface that is full-plane without a button, and can maintain high-sensitivity touch sensing performance, bringing a new generation of breakthrough technology to the process. , very competitive in the market.

In order to achieve the above object, the present invention provides a method for manufacturing a display panel with a hidden blind hole, comprising the following steps: The present invention provides a display panel structure with a hidden blind hole and a manufacturing method thereof, which have a transparent substrate a blind hole and a visible area, and a cover member is disposed on the visible area to cover the component as a mask, and the surface of the transparent substrate is sprayed to form a decorative layer around the inner surface of the blind hole and the visible area, and finally The cover element is removed and the desired decorative layer pattern is obtained.

Wherein, after the step of spraying the decorative layer, the step of drying the decorative layer is further included.

The present invention provides another display panel structure with a hidden blind hole, comprising a transparent substrate having a blind hole and a visible area; and a decorative layer sprayed on the transparent substrate to cover the decorative layer The inner surface of the blind hole and the periphery of the visible area. [00010] wherein the covering member is preferably a rubber or polyethylene terephthalate protective film. [00011] wherein the inner surface of the blind hole is formed with a decorative layer, and the thickness of the decorative layer between the bottom and the side of the blind hole is 2-5 times of the bottom of the blind hole. [00012] wherein the thickness of the decorative layer at the edge of the visible area is 2-3 times that of the bottom of the blind hole. [00013] wherein the angle between the visible area and the decorative layer is greater than 40 degrees. [00014] wherein the thickness of the decorative layer at the bottom of the blind hole is the same as the thickness of the decorative layer around the visible area. [00015] wherein the covering element is a transparent film or a transparent glass. [00016] wherein the decorative layer is an ink layer. [00017] wherein the ink layer is preferably a black matrix material. [00018] The blind hole design is a signal receiving hole, a transmitting signal hole, a function key pattern or a fingerprint identification component or other functional components. [00019] The purpose, technical contents, features, and effects achieved by the present invention are more readily understood by the detailed description of the embodiments.

[00021] With the rapid rise of portable products and the increasing demand for functions, the demand for the global digital device market has also grown rapidly, especially for lightweight and thin designs such as smart phones or tablet computers, which need to continue to increase market demand. The invention is improved and innovated after the product is beautiful and the operating feel is growing. After years of painstaking research, a novel display panel structure has been developed, which is no longer able to continue to miniaturize the digital device size. Under the same performance or higher performance to create a more reliable and simpler display panel structure. [00022] Please refer to FIG. 2, which is a schematic structural view of a display panel of the present invention. The display panel structure includes a transparent substrate 20 and a decorative layer 22. The transparent substrate 20 has a blind hole 24 and a visible area 26. The decorative layer 22 is sprayed on the transparent substrate 20 to cover the decorative layer 22 in the blind hole 24. The inner surface and the visible area 26 are surrounded. In order to further illustrate the technical details of the present invention having a decorative layer, please refer to FIG. 3, which is a cross-sectional view taken along line A-A' of FIG. 2, the transparent substrate 20 and the inner surface of the blind hole 24. The decorative layer 22 has been sprayed, and the thickness of the decorative layer 22 between the bottom of the blind hole 24 (the B area indicated in the figure) and the side edge (the A area indicated in the figure) is the bottom of the blind hole 24 2 -5 times, as is apparent in the figure, the left and right side edges of the blind hole 24 have a film thickness larger than the bottom of the blind hole 24; and the thickness of the decorative layer 22 at the bottom of the blind hole 24 is the same as the thickness of the decorative layer 22 around the visible area 26. . The edge of the visible area 26 (C area indicated in the figure) has a decorative layer 22 thickness 2-3 times that of the bottom of the blind hole 24, and the angle between the visible area 26 and the decorative layer 22 is more than 40 degrees, which is effective. The area between the visible area and the non-visible area is separated, and there is no problem that the non-visible area has light transmission. The decorative layer is preferably an ink layer, and the ink layer is a black matrix material. The blind hole 24 is a signal receiving hole, a transmitting signal hole, a function key pattern or a fingerprint identifying element or other functional element. It should be noted that, if the thickness of the transparent substrate 20 is generally 500 μm as an example, by the structural design of the present invention, the relative position of the functional key pattern design on the transparent substrate 20 (shown as H in the figure) is blind. The thickness of the transparent substrate 20 at the position of the hole 24 and the blind hole 24 can still be maintained less than 450 μm (H' as indicated in the figure), that is, the blind hole depth only needs 50 μm, and the depth has almost realized the non-visible of the glass substrate 20. The area is planarized, and the design of the recessed hole depth must be greater than 200 μm compared to the prior art, and the present invention can indeed achieve the technique of concealed blind holes. [00023] In order to further understand the flow of the fabrication steps of the present invention to achieve a novel structure of hidden blind holes, please refer to FIG. 4 and FIGS. 5A-5G simultaneously; FIG. 4 is a flow chart of steps of the present invention, FIG. 5A ～5E is a schematic structural view of the structure of the display panel of the present invention. The method for manufacturing a hidden blind hole display panel comprises a blind hole 24 and a visible area 26 on a transparent substrate 20. As shown in FIG. 5A, a transparent substrate 20 and a transparent substrate 20 are provided. The transparent glass substrate or the transparent film or any substrate having a light transmissive material can be applied to the structural design and the manufacturing method of the present invention. Here, the glass substrate is taken as an example, and the manufacturing is developed according to the existing user requirements and technology. In the process, the use of glass substrate materials has become a trend. Of course, the glass substrate used in this case is a chemically and physically strengthened tempered glass with high mechanical strength to protect the touch elements and the display. As shown in FIG. 5B, in the method of fabricating the blind via 24, the blind via 24 is firstly scribed on the transparent substrate 20 corresponding to the position of the touch component. It is common to make the blind via 24 by mechanical means, such as for blind vias. The special drill bit processed by 24, the blind hole 24 is deeply controlled to make the blind hole 24 of a desired depth, or the blind hole 24 is formed by laser etching, and the inner surface of the blind hole 24 can be formed. Strengthening the ion layer can improve the mechanical strength of the blind hole 24 and its surroundings. Of course, the technique of how to make the blind hole is not the focus of the ink invented in the present invention. Therefore, the example of making the blind hole technology is not used to limit the present. The scope of the invention. The visible area 26 can be set to a range of sizes according to requirements, and how much border distance is to be designed around the visible area 26 to facilitate subsequent graphic processing. [00024] As in step S12, in order to form the desired pattern on the transparent substrate 20, a cover member 28 must be disposed on the viewable area 26. As shown in FIG. 5C, the shape and size of the cover member 28 are identical to the viewable area 26. It can completely cover the visible area 26. Wherein, the covering member 28 is a rubber or polyethylene terephthalate protective film, and since the covering member 28 is temporarily set only for the process requirement, the convenience of subsequent removal is very important. In terms of the characteristics of the glue, it has scratch-proof and dust-proof protection. It can completely remove the residue-free glue after high temperature, water washing and baking process, and has low smoke generation, high film flexibility and acid and alkali resistance. Contains eight major heavy metals and other advantages. In terms of the characteristics of the ethylene terephthalate protective film, it has the advantages of smooth film surface, stable viscosity, easy tearing, no fogging, no residue, and complete viscosity. In step S14, the surface of the transparent substrate 20 is sprayed with the cover member 28 as a mask to form a decorative layer 22 around the inner surface of the blind hole 24 and the visible region 26. As shown in FIG. 5D, the decorative layer 22 is entirely sprayed on the inner surface of the cover member 28, the transparent substrate 20, and the blind via 24 to form a decorative layer 22 having a thickness. The decorative layer 22 may be a general black ink or a color ink or a color photoresist. Or other materials with a color or shading effect, can be stacked in a single layer or multiple layers during the spraying process. After the step of spraying the decorative layer 22, in step S16, the decorative layer 22 is dried, and the decorative layer 22 is baked and cured to avoid affecting the subsequent process. As shown in FIG. 5E, the heater 30 or the process may be used. A large oven or any dry-curable decorative layer 22 is suitable for use in the technical application of the present invention. Finally, in step S18, after the decorative layer 22 is cured, the covering member 28 is removed. As shown in FIG. 5F, while the covering member 28 is removed, the decorative layer 22 sprayed on the covering member 28 is also removed. In addition, the patterned structure of the visible area 26 and the non-visible area can be presented. The transparent substrate 20 is applied in combination with the display panel and the touch element. It is worth noting that, compared to the prior art, a plurality of screen printing processes are used to fabricate the decorative layer. The present invention uses the spraying technique to fabricate the decorative layer 22, which can be completed by spraying once according to the thickness of the desired decorative layer 22. Not only can it effectively save process time, but also improve process yield. [00025] As shown in the 5G diagram, after the cover member is removed, it is apparent that the thickness between the edge of the visible region 26 and the decorative layer 22 is slightly thicker than the decorative layer 22 on the transparent substrate 20 due to the blind hole. The thickness of the decorative layer 22 at the bottom of the 24 is the same as the thickness of the decorative layer 22 around the visible area 26, so that the thickness between the edge of the visible area 26 and the decorative layer 22 is also slightly thicker than the thickness of the decorative layer 22 at the bottom of the blind hole 24, designed in accordance with the present invention. It is slightly thicker than 2-3 times for optimum thickness. Wherein, the edge of the visible area 26 and the decorative layer 22 are sprayed, so that after the cover member is removed, an angle between the visible area 26 and the decorative layer 22 is generated, and the preferred angle of the spray design of the present invention is More than 40 degrees, and the angle of the angle can effectively separate the visible area from the non-visible area, and does not cause the problem of light transmission in the non-visible area, which can improve product reliability. Moreover, the thickness of the decorative layer 22 at the end points of the left and right sides of the blind hole 24 is larger than the bottom of the blind hole 24. For the prior art, the problem of the breakage of the blind hole and the incomplete printing is relatively easy. The invention utilizes the spraying technique to effectively overcome the shortcomings of the prior art, so that the decorative layer 22 at the left and right side end points of the blind hole 24 is slightly thicker, so that the process yield is more optimized. [00026] In summary, the present invention utilizes a spray printing technique to produce a patterned design on a transparent substrate and a blind hole inner surface on a non-display area, which is not only simple to manufacture but also high in product reliability. Compared with the prior art, the screen printing ink is used to make the function key pattern on the mobile phone panel, but after the corresponding function key pattern position is dug, the ink cannot be screen printed into the concave hole, and the screen must be additionally screened once for the concave hole. However, for the two ends of the inner surface of the concave hole, there is a difficulty in screen printing ink, instead of accumulating too thick ink in the concave hole, that is, the two ends of the inner surface of the concave hole cannot be screen printed for a predetermined thickness, and even the screen printing is incomplete. Therefore, the present invention utilizes spraying to make a decorative layer on the inner surface of a blind hole, which can break through the bottleneck of the existing process. [00027] Furthermore, the present invention utilizes a spray printing technique to produce a novel structure in which the surface of the transparent substrate is a full-plane without a button. According to the above manufacturing method, the depth of the blind hole does not need to be too deep, and the depth of the prior art can be designed. It must be greater than 200μm to reduce the blind hole depth to only 50μm, so that the mechanical strength of the transparent substrate can be maintained without damaging the hardness characteristics of the tempered glass. In the current popular touch panel design, it must have the ability to resist external force. The mechanical strength has been highly concerned by the technology industry and consumers. Therefore, the present invention can overcome the bottleneck of the existing process and maintain high-sensitivity touch sensing performance, bringing a new generation of breakthrough technology to the process, which is highly competitive in the market. Advantage. [00028] The above description is only for the preferred embodiment of the invention and is not intended to limit the scope of the invention. Therefore, any changes or modifications of the features and spirits of the present invention should be included in the scope of the present invention.

【00029】
10‧‧‧ glass cover
12‧‧‧Touch components
14‧‧‧ recessed hole
16‧‧‧Flap
20‧‧‧Transparent substrate
22‧‧‧Decorative layer
24‧‧‧Blind hole
26‧‧‧visible area
28‧‧‧ Covering components
30‧‧‧heater

[00020] Figure 1A is a schematic view of the prior art glass cover structure. FIG. 1B is a schematic view showing the structure of a prior art in which a recessed hole is formed in a glass cover. 2 is a schematic structural view of a display panel of the present invention. Fig. 3 is a cross-sectional view of the structure taken along line A-A' of Fig. 2. Figure 4 is a flow chart showing the steps of the present invention. 5A-5G are schematic diagrams showing the structure of each step of the structure of the display panel of the present invention.

20‧‧‧Transparent substrate

22‧‧‧Decorative layer

24‧‧‧Blind hole

26‧‧‧visible area

Claims (20)

A method for manufacturing a display panel with a hidden blind hole, comprising the steps of: providing a transparent substrate having a blind hole and a visible area; and providing a covering component on the visible area; Spraying the surface of the transparent substrate to form a decorative layer on the inner surface of the blind hole and around the visible region; and removing the covering member. The method for manufacturing a display panel with a hidden blind hole according to claim 1, wherein the covering member is a rubber or ethylene terephthalate protective film. The method for manufacturing a display panel with a hidden blind hole according to claim 1, wherein after the step of spraying the decorative layer, the step of drying the decorative layer is further included. The manufacturing method of the display panel with a hidden blind hole according to claim 1, wherein the inner surface of the blind hole is formed with the decorative layer, and the thickness of the decorative layer between the bottom and the side of the blind hole is the blind hole. 2-5 times the bottom. The method for manufacturing a display panel with a hidden blind hole according to claim 1, wherein the thickness of the decorative layer at the edge of the visible region is 2-3 times that of the bottom of the blind hole. The method for manufacturing a display panel with a hidden blind hole according to claim 1, wherein an angle between the visible area and the decorative layer is greater than 40 degrees. The method for manufacturing a display panel with a hidden blind hole according to claim 1, wherein the thickness of the decorative layer at the bottom of the blind hole is the same as the thickness of the decorative layer around the visible region. The method for manufacturing a display panel with a hidden blind hole according to claim 1, wherein the covering member is a transparent film or a transparent glass. The method for manufacturing a display panel with a hidden blind hole according to claim 1, wherein the decorative layer is an ink layer. The structure of the display panel with hidden blind holes according to claim 9, wherein the ink layer is a black matrix material. The display panel with a hidden blind hole according to claim 1, wherein the blind hole is a signal receiving hole, a transmitting signal hole, a function key pattern or a fingerprint identification element. A display panel structure with a hidden blind hole, comprising: a transparent substrate having a blind hole and a visible area; and a decorative layer sprayed on the transparent substrate to cover the blind hole The inner surface and the surrounding of the visible area. The display panel structure with a hidden blind hole according to claim 12, wherein the thickness of the decorative layer between the bottom and the side of the blind hole is 2-5 times of the bottom of the blind hole. The display panel structure with a hidden blind hole according to claim 12, wherein the decorative layer at the edge of the visible area has a thickness of 2-3 times that of the bottom of the blind hole. The display panel structure with a hidden blind hole according to claim 12, wherein the thickness of the decorative layer at the bottom of the blind hole is the same as the thickness of the decorative layer around the visible area. The display panel structure with a hidden blind hole according to claim 12, wherein the blind hole is a signal receiving hole, a transmitting signal hole, a function key pattern or a fingerprint identification component. The display panel structure with a hidden blind hole according to claim 12, wherein an angle between the visible area and the decorative layer is greater than 40 degrees. The display panel structure with a hidden blind hole according to claim 12, wherein the decorative layer is an ink layer. A display panel structure having a hidden blind hole according to claim 18, wherein the ink layer is a black matrix material. The display panel structure with a hidden blind hole according to claim 12, wherein the transparent substrate is a transparent film or a transparent glass.