JP6010882B2 - How to create a front panel - Google Patents

Description

The present invention is a mobile phone, altitude information terminal, a car navigation, in the creation method and the surface panel of the facing panel for use in an electronic book tablet, etc., a method and member to create an outer frame of the outer display of the central portion of the liquid crystal display panel It is about.

  FIG. 1 shows an example of a display unit of a mobile phone. A display panel 100 of a mobile phone shown in FIG. 1A includes an inner frame portion 1 that is a display portion, and an outer frame portion 2 outside the display portion. Further, the outer frame portion of the display panel 101 of the mobile phone shown in FIG. 1B may be provided with a mirror character 3 representing a mobile phone company, for example.

  A basic configuration of the display panel will be described with reference to the drawings. 2A is a diagram schematically showing a part of the cross section of the display panel 100 of the mobile phone, and FIG. 2B is a diagram schematically showing a part of the cross section of the display panel 101 of the mobile phone. It is.

  The display panel 100 shown in FIG. 2A is provided with an ink layer 6 and an adhesive layer 7 on the back surface of the display panel substrate 4, and a hard coat layer 8 on the surface, and a protective film on the top surface. 9 is affixed.

  The display panel 101 shown in FIG. 2B has a mirror printing layer 5 with a mirror character on the back surface of the display panel substrate 4, an ink layer 6, and an adhesive layer 7, and a hard coat on the surface. The layer 8 is provided and the protective film 9 is stuck on the uppermost surface.

  As the display panel substrate 4, any one of a glass sheet, a PMMA (polymethyl methacrylate resin) sheet, a PC (polycarbonate) sheet, and the like is used.

  The mirror printing layer 5 and the ink layer 6 are generally formed by silk screen printing. The ink layer 6 is a layer having a concealing property and a cosmetic property in order to give the design properties of the display panel.

JP 2007-225699 A JP 2010-44546 A Japanese Patent No. 38133270

  In the conventionally used display panel shown in FIG. 2, the mirror printing layer 5 is 5 to 7 μm, and the ink layer 6 is often subjected to decorative printing by repeating screen printing several times to ensure concealment. The thickness is increased to about several μm to 25 μm.

  Therefore, the inner frame portion 1 (hereinafter referred to as the display portion) which is the display portion and the outer frame portion 2 outside the display portion and the steps are several in the case of the display panel without the mirror print layer 5 shown in FIG. In the case of a display panel having the mirror printing layer 5 shown in FIG. 2B, the thickness is about 10 to 30 μm, and an adhesive layer 7 (layer thickness: about several μm) is applied as shown in FIG. However, the step cannot be filled (FIG. 3 (a)), and the touch panel electrode layer 10 and the RGB display layer 11 are provided in the lower part (FIG. 3 (b)), or the display panel having no touch panel function. In this case, the RGB display layer 11 is provided (FIG. 3 (c)). In this case, there is a problem that air bubbles are embraced in the display portion due to a step and a defective product is generated.

Accordingly, an object of the present invention is to provide a method for producing a surface panel and a surface panel in which the outer frame portion 2 outside the display portion is formed by a method having no step difference from the display portion 1.

Accordingly, an invention according to claim 1 of the present invention is a method for producing a surface panel used in a liquid crystal display panel,
A method of creating an outer frame portion provided outside the display portion at the center of the front panel,
A vapor deposition layer having a concealing property is formed on a surface opposite to the viewer side of the surface panel base material constituting the surface panel through a mask having a display portion shape,
It is a method for producing a surface panel, wherein the display portion side of the vapor-deposited layer is laser processed to produce an outer frame portion having no roughness on the display portion side.

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The invention according to claim 2 of the present invention is the method for producing a front panel according to claim 1, wherein one of the plurality of vapor deposition layers is changed to an ink jet layer.

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  According to the present invention, it is possible to create a concealing outer frame portion having a small step with respect to the display portion, and as a result, when the touch panel electrode layer or the RGB display layer is provided, the inclusion of bubbles does not occur. . Furthermore, by laser processing the inner edge of the outer frame portion created through the display-shaped mask, and after applying a photoresist, the photoresist is exposed and developed through the photomask to create an outer frame. Therefore, an outer frame free from roughness can be created, so that an outer frame portion having excellent cosmetic properties can be obtained.

The figure which showed an example of the display panel of a mobile telephone. (A) is a figure which shows the display panel of a mobile telephone. (B) is a figure which shows the case where the mirror character is given to the outer frame part. The figure which shows typically a part of cross section of the display panel of a mobile telephone. The figure for demonstrating the problem in the case of the conventional display panel. (A) is a figure which shows that a level | step difference cannot be filled even if an adhesive layer is apply | coated. (B) is a figure which shows the case where a touchscreen electrode layer and a RGB display layer are provided. (C) is a figure which shows the case where an RGB display layer is provided. The figure for demonstrating the method of creating the surface panel by this invention. (A) is a figure which shows the case where an outer-frame part is obtained. (B) is a figure which shows forming decoratively a 2nd vapor deposition layer or an inkjet layer, when concealment property is insufficient. (C) is a figure which shows having formed the contact bonding layer. (A) is the figure which looked at (FIG.4 (c)) from the upper surface. (B) is a figure which shows the serrated roughness of the inner end of the outer frame part of the masked display part. (C) is a figure which shows the inner end processed with the laser beam. (D) is a diagram showing the roughness P at the inner end. The figure which shows the procedure which produces the outer frame which concerns on this invention by the photolithographic method. The figure which shows the icon part formed in the outer frame part.

Hereinafter will be described the embodiments of the forming method and the surface panel of the front panel according to the present invention with reference to the drawings.

FIG. 4 is a view for explaining a method of producing the front panel 110 according to the present invention. The front panel 110 is provided with a vapor deposition layer 26-1, an adhesive layer 17, and a hard coat layer 18 on a front panel substrate 14 using any one of a glass sheet, a PMMA sheet, and a PC sheet, and on the uppermost surface. A protective film 19 is pasted.

Example 1
The vapor deposition layer 26-1 according to the present invention is first formed by decorating the first vapor deposition layer 26-1 by masking the display portion on the surface panel substrate 14 and black vapor deposition (for example, chromium vapor deposition) in consideration of concealment. Thus, an outer frame portion is obtained (FIG. 4A). When the concealability is insufficient, the second vapor-deposited layer or the inkjet layer 26-2 is decorated and formed (FIG. 4B). In this case, the second vapor-deposited layer or the inkjet layer 26-2 is an ultra-thin decorative layer that is equal to or less than or equal to the first vapor-deposited layer.

  Next, the masking is peeled off, and then an adhesive OCA (optical adhesive) is applied and UV curing is performed to form the adhesive layer 17 (FIG. 4C).

  FIG. 5A is a top view of FIG. 4C. In this case, the inner end 32 of the outer frame portion 31 of the masked display portion 30 has saw-toothed roughness (FIG. 5). (B)). In order to deteriorate the designability, this roughness is subjected to fine processing by laser as described below.

  Therefore, a laser beam such as a near-ultraviolet laser, a far-ultraviolet laser, or an ultrashort pulse laser is irradiated along the inner end 32 of the outer frame portion 31 to melt black vapor deposition and finish the inner end 32 to an inner end 32a without roughness ( FIG. 5 (c)).

  According to the above laser processing, the roughness (showing the peak height range P of the valley) shown in (FIG. 5 (d)) was n = 3 and 432 μm immediately after the deposition. After the laser processing, it became as smooth as 225 μm, the effect of laser processing was recognized, and an outer frame excellent in cosmetics was obtained.

Moreover, since the said 1st vapor deposition layer 26-1 is about 2420-3330 mm, and the 2nd vapor deposition layer or the inkjet layer 26-2 is equivalent to a 1st vapor deposition layer, or thinner, UV hardening OCA adhesive agent Even if (thickness: several μm) is subsequently applied to the entire surface , a thickness step between the display portion and the outer frame portion on the back surface of the front panel substrate 14 does not occur.

The number of occurrences of defective inclusion of bubbles of 0.5 mmΦ or more in a liquid crystal display member having an outer frame part obtained by conventional screen printing and a liquid crystal display member having an outer frame part obtained by the above method As a result of comparison, the number of samples n = 10 was 5 for the surface panel provided with the outer frame portion obtained by the conventional screen printing, whereas the outer frame portion obtained by the above method was provided. In the case of the front panel , it was twice, and it was confirmed that the frequency of occurrence of defects was low.

(Example 2)
In the above, the first vapor deposition layer 26-1 and the second vapor deposition layer 26-2 were formed using a mask, but as shown in FIG. 6, any one of a glass sheet, a PMMA sheet, and a PC sheet was used. After the vapor deposition layer 36 was provided on the back surface of the front panel substrate 14 (FIG. 6A), a photoresist film 37 was applied on the entire surface of the vapor deposition layer 36 (FIG. 6B), and then the display frame After exposure through a photomask 38 corresponding to (FIG. 6C), development (FIG. 6D), and peeling off the resist film 37 (FIG. 6E), an outer frame is created. Also good. In this case, the inner edge of the outer frame is free from roughness, and the laser processing is not required.

  In the above description, the outer frame portion that is decorated in black by chromium vapor deposition is exemplified, but the present invention is not limited to this, by designing the vapor deposition film, and by determining the material type, film thickness, and number of layers for vapor deposition, It is possible to decorate and form an outer frame portion that is colored and excellent in cosmetics and concealment.

  Further, since the outer frame portion is formed by vapor deposition, a touch response can be easily obtained in a capacitive touch panel having, for example, the icon portion 40 formed on the outer frame portion 31 as shown in FIG.

In this way, it is possible to obtain a vapor-deposited decorative panel excellent in concealability and cosmetics without steps.

As described above, according to the method for producing a surface panel according to the present invention, a surface panel having high concealability and cosmetics can be obtained. Further, the step between the display portion and the outer frame portion formed on the back surface of the panel base material is remarkably smaller than the conventional case, and the yield when processing into a panel can be improved.

DESCRIPTION OF SYMBOLS 1 ... Display part 2 ... Outer frame part
3 ... Mirror characters
4. Display panel base material
5 ... Mirror printing layer
6 ... Ink layer
7: Adhesive layer
8 ... Hard coat layer
9 ... Protective film
10 ... Touch panel electrode layer
11 ... RGB display layer
14 ... Surface panel substrate
17 ... Adhesive layer
18 ... Hard coat layer
19 ... Protective film
26-1 ... first vapor deposition layer
26-2: Second vapor deposition layer or inkjet layer
30 ... Masked display
31 ... Outer frame part outside the masked display part
32 ... Inner end of outer frame 31
32a ... Inner edge without roughness
37 ... Resist film
38 ... Photomask
40 ... Icon part
100, 101 ... Mobile phone display panel
110: Surface panel P according to the present invention ... Peak height range of the valley

Claims (2)

  In a method for creating a surface panel used in a liquid crystal display panel, a method for creating an outer frame portion provided outside a display portion at a central portion of the surface panel, the observer observing the surface panel substrate constituting the surface panel A vapor deposition layer having a concealing property is formed on a surface opposite to the side through a mask having a display portion shape, and the display portion side of the vapor deposition layer is laser processed so that the display portion side is not rough. A method for producing a surface panel, comprising producing an outer frame part.   The method for producing a surface panel according to claim 1, wherein one of the plurality of vapor deposition layers is changed to an ink jet layer.