JP4217496B2 - Display board for automobile instrument and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission illumination type automotive instrument display panel used in vehicles such as automobiles and a method of manufacturing the same.
[0002]
[Prior art]
In general, an instrument panel is disposed in a front portion of a vehicle compartment in an automobile, and a display board for an automobile instrument is provided on the instrument panel. The vehicle instrument display board is provided with a speedometer, an engine tachometer, and the like. These speedometers use screen printing or the like to emit a desired display color when the backlight is not lit. Thus, all light-transmitting portions such as scales and characters that emit a desired transmitted light color when the backlight is turned on are formed. In addition, the display panel has a warning part such as a hazard lamp that can be recognized by the transmitted light color when the backlight is lit, while the occupant is not recognized by the same color (similar color) as the base color of the display panel when the backlight is not lit. A semi-light-shielding portion and a light-shielding portion serving as a base of the display panel are also formed (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-148079
[Problems to be solved by the invention]
However, the conventional automotive instrument display panel has a problem that the warning portion is dark and difficult to see when the backlight is turned on, or clearly visible when the backlight is not turned on.
[0005]
Therefore, an object of the present invention is to provide a display panel for an automobile instrument in which a warning portion is clearly visible when the backlight is lit and is not noticeable when the backlight is not lit, and a manufacturing method thereof.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a translucent display substrate that transmits light emitted from a light source, a receiving layer formed on at least one surface of the translucent display substrate, and formed on the receiving layer. A display panel for an automotive instrument comprising a light-shielding printed layer, wherein a thickness of a receiving layer in a warning portion of a portion of the display plate is made thinner than a thickness in another portion , and the warning The area ratio of the black ink in the light-shielding print layer of the part is lower than the area ratio of the black ink in the light-shielding print layer of the light-shielding part among the other portions .
[0007]
The invention described in claim 2 is the display panel for an automobile instrument according to claim 1, wherein the thickness of the receiving layer in the warning portion is reduced by removing the receiving layer in the warning portion by laser processing. It is characterized by being thinner than the thickness of other parts.
[0008]
According to the third aspect of the present invention, the surface side of the receiving layer in a part of the portion of the display plate in the translucent display substrate in which the receiving layer is formed on at least one side is removed by laser processing. a step of forming thinner than the thickness of the thickness of other portions of a portion of the receiving layer, comprises a step of forming a light-shielding printed layer on the receptive layer, the black in the light-shielding printed layer of the portion A method for manufacturing a display panel for an automotive instrument , wherein the area ratio of ink is lower than the area ratio of black ink in a light-shielding print layer in a light-shielding portion among the other portions .
[0009]
The invention described in claim 4 includes a step of forming a printed layer on a receiving layer of a translucent display substrate having a receiving layer formed on at least one side, and a part of a portion of the display plate. Removing a part of the receiving layer from the surface side of the printed layer by laser processing to make the thickness of a part of the receiving layer thinner than the thickness of the other part, and spraying black ink on the receiving layer, A method for manufacturing a display panel for an automotive instrument, comprising: making the area ratio of black ink in the light-shielding print layer of the other portion lower than the area ratio of black ink in the light-shielding print layer of the light-shielding portion among the other portions It is.
[0010]
The invention described in claim 5 is the method for manufacturing a display panel for an automotive instrument described in claim 3 or 4, wherein the portion thinner than the thickness of the receiving layer in the other part is a warning part. And forming a light-shielding printing layer on the receiving layer having the thickness of the warning portion with a similar color and lowering the light-shielding property than the light-shielding printing layer formed on the receiving layer having the thickness. It is a manufacturing method of the display board for automobile instruments which consists of these.
[0011]
【The invention's effect】
According to the first aspect of the present invention, it is possible to improve the clarity of the warning portion of the display board while maintaining the clarity of the display of scales and characters.
[0012]
Usually, increasing the thickness of the receiving layer can make the scale of the display panel clearer, but on the other hand, the amount of light transmitted through the semi-transparent part such as the warning part is reduced, so that the letters and symbols of the warning part etc. Becomes difficult to see. Further, when the thickness of the receiving layer of the entire display panel is made thin, there is a problem that the ink absorbability is deteriorated and the color developability of the scales and characters in the all light-transmitting portions is deteriorated due to ink bleeding. That is, this semi-transparent portion needs to clarify contrast that is clearly visible when a light source such as a backlight is turned on and is inconspicuous as much as possible when it is not turned on. Such contrast can be clarified.
[0013]
According to the second aspect of the present invention, since the receiving layer is removed and thinned by laser processing, the receiving layer can be processed to an accurate thickness at a rapid speed. it can. In this laser processing method, various lasers such as a CO ₂ laser, a yttria-aluminum-garnet laser (YAG), a UVYAG, and an excimer laser can be used.
[0014]
According to the third aspect of the invention, since the thickness of the receiving layer is changed for each part of the display plate by laser processing, when the light transmittance is to be improved, the thickness of the receiving layer is reduced, When it is desired to reduce the transmittance, the thickness of the receiving layer can be increased. Thus, if the printing layer is formed after forming the receiving layer to be thin, the thickness of the printing layer can be made substantially uniform even at portions where the thickness of the receiving layer is different.
[0015]
According to the fourth aspect of the present invention, the same effect as in the third aspect can be obtained. However, in claim 3, the printed layer is formed after the thickness of the receiving layer is reduced. In claim 4, after forming the printed layer, the receiving layer is laser processed together with the printed layer. According to this, after forming a printing layer and producing a display board, the light transmittance of a part of display board can be changed and adjusted suitably.
[0016]
According to the invention described in the fifth aspect, the warning portion is clearly seen when a light source such as a backlight is turned on, and when not turned on, the warning portion is made as much as possible by a similar color to other parts. It can be made inconspicuous.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 is a front view of a display panel 10 for an automotive instrument according to an embodiment of the present invention. On the display panel 10 for an automobile instrument, a fuel gauge 11 is displayed on the left end side, and a first warning section 12 is displayed below the fuel gauge 11. A vehicle speed meter 13 and an engine tachometer 14 are displayed on the center side, and a water temperature meter 15 and a second warning unit 16 are displayed on the right end side. A third warning unit 17 is displayed on the upper portion between the vehicle speed meter 13 and the engine tachometer 14.
[0019]
The automobile instrument display board 10 includes, for example, white letters, numbers, scales, symbols, and the like. For example, the speedometer 13 includes a character 18 “km / h”, a number 19 indicating a speed “180”, and a scale 20. Also, for example, in the third warning unit 17, a hazard lamp arrow symbol 21 is shown. In addition, what is called a base | substrate part without the display of these characters 18 and the scale 20 is formed in the black light-shielding part 22, for example.
[0020]
Here, the display board 10 can be roughly divided into three. That is, a desired display color is emitted when the backlight is not lit, while a desired transmitted light color is emitted when the backlight is lit. The above-mentioned first to third warnings that can be recognized by the transmitted light color when the backlight is lit, while being lit by the same color (similar color) as the base plate of the display board and not easily recognized by the passengers, regardless of day or night. It comprises a semi-translucent part of the parts 12, 16, and 17 and a light shielding part 22 as a base part where no character 18 or the like is displayed.
[0021]
FIG. 2 is an enlarged cross-sectional view of the automotive instrument display board 10.
[0022]
In the figure, the upper side is arranged on the front side, and the lower side is arranged on the back side. Further, the left side of the display panel 10 shows a cross section of the light shielding part 22, the central side shows a cross section of the semi-translucent part 23, and the right side shows a cross sectional structure of the total translucent part 24.
[0023]
The cross-sectional structure of the display panel 10 in the light shielding portion 22 is that a translucent display substrate 25 disposed at the bottom, a fixing layer 26 formed on the surface of the translucent display substrate 25, and the fixing layer 26. A white receiving layer 27 formed on the surface, and a light-shielding printing layer 28 formed by penetrating the surface of the receiving layer 27 are provided.
[0024]
The translucent display substrate 25 is made of a substantially transparent synthetic resin such as polycarbonate (PC), polycarbonate ABS, ABS, or the like. For the fixing layer 26 and the receiving layer 27, various methods such as coating by a coater and screen printing can be used, and the number of coating times and the number of printing times are not limited. The fixing layer 26 is formed with a thickness of about 2 μm, and the receiving layer 27 is formed with a thickness of about 40 μm.
[0025]
The thickness T1 of the receiving layer 27 in the semi-translucent portion 23 is formed thinner than the thickness T2 of the receiving layer 27 in the light shielding portion 22 and the total light transmitting portion 24, for example. The thickness T1 is not particularly limited, and can be set to a desired thickness by various methods such as laser processing.
[0026]
Further, the light-shielding print layer 28 can be formed by, for example, an ink jet printing method. According to this ink jet printing method, the ink can be formed by spraying small droplets of black ink on the surface of the receiving layer 27 to penetrate. The light-shielding portion 22 on which the light-shielding printing layer 28 is formed has a sufficient ink absorbability due to the thickness T2 of the receiving layer 27, and the color developability is also kept good without the ink bleeding. Therefore, since the boundary between the all light transmitting portion 24 and the light shielding portion 22 that becomes the character 18 and the scale 20 is clearly formed, the clarity of the character 18 and the scale 20 is ensured.
[0027]
In the light shielding part 22, since the area ratio of the portion where the black ink BK penetrates is 100%, the light 30 emitted from the backlight 29 arranged below the display panel 10 can be almost completely shielded. Further, in the semi-translucent portion 23, the area ratio of the black ink BK is about 80% black, and the thickness T1 of the receiving layer 27 is formed thinner than other portions. The light 30 is reliably transmitted. On the other hand, when the backlight 29 is not turned on, the light is blocked by the light-shielding printing layer 28 of about 80% of the black, and is almost the same as the color of the base portion in the light-shielding portion 22, so It is almost inconspicuous even when seen. Further, in the all light transmitting portion 24, the thickness of the receiving layer is T2, and the light-shielding printing layer 28 made of black ink is not formed at all on the surface. Has been.
[0028]
Next, a method for manufacturing the automotive instrument display board 10 according to the present embodiment will be briefly described.
[0029]
First, as shown in FIG. 2, the fixing layer 26 is applied to the surface of the translucent display substrate 25 using, for example, a coater so that the film thickness is about 2 μm. Next, the receiving layer 27 is coated on the fixing layer 26 with a coater or the like so that the film thickness becomes, for example, about T1 = 40 μm. Then, the surface of the receiving layer 27 is removed so that the thickness of the receiving layer 27 is about T2 = 20 μm by applying laser processing to the semi-transparent portion 23 of the warning portions 12, 16, and 17. Various lasers such as a CO ₂ laser, a yttria-aluminum-garnet laser (YAG), a UVYAG, and an excimer laser can be used for this laser processing method.
[0030]
A light-shielding printing layer 28 is printed from above the receiving layer 27 using an ink jet printing method or the like. In the light-shielding portion 22, black ink is sprayed so as to be 100% black to form the light-shielding print layer 28 over two layers, and the semi-translucent portion 23 is, for example, an amount that is 80% black. The black ink is sprayed to form one light-shielding print layer 28. Then, the color of the receiving layer 27 is exposed as it is without spraying black ink on the entire light transmitting portion 24. After the light-shielding print layer 28 is formed, moisture in the receiving layer 27 and the light-shielding print layer 28 is removed by heat drying. In addition, it is also possible to print the light-transmitting portion 24 with, for example, blue or red ink so that a desired display color can be obtained. At this time, since the thickness of the receiving layer 27 of the total light transmitting portion 24 is sufficiently secured from the viewpoint of T2 and the ink absorbability, the color developability can be maintained well without the ink bleeding. Finally, overcoating with a UV absorber may be performed.
[0031]
According to this embodiment, since the receiving layer 27 is thinly formed by laser processing, the receiving layer 27 can be processed to an accurate thickness at a rapid speed. Further, after forming the light-shielding print layer 28, a part of the receiving layer 27 may be laser processed together with the light-shielding print layer 28. According to this, the light-shielding print layer 28 is formed and the display board 10 is formed. After fabrication, the light transmittance of the semi-translucent portion 23 can be adjusted.
【Example】
Next, the present invention will be specifically described with reference to examples.
[0033]
First, as shown in FIG. 2, a fixing layer 26 was applied to the surface of a translucent display substrate 25 made of polycarbonate so as to have a film thickness of 2 μm. Next, the receiving layer 27 was applied on the fixing layer 26 to a thickness of 40 μm using a coater.
[0034]
And about the semi-translucent part 23, the receiving layer 27 was removed by laser processing from the surface side, and the thickness was 20 micrometers. A light-shielding printing layer 28 was printed on the receiving layer 27 of the light-shielding portion 22 so as to be 100% black using an ink jet printing method. This inkjet printing used EPSON MC2000. In addition, the light-shielding print layer 28 was formed in the semi-translucent portion 23 so as to be 80% black. After this printing, heat drying was performed to remove moisture.
[0035]
The display panel 10 manufactured in this embodiment can clearly discriminate the part of the semi-translucent portion 23 when the backlight 29 is turned on, and hardly discriminates when the backlight 29 is not turned on. It was possible to make the contrast of light and dark clear.
[Brief description of the drawings]
FIG. 1 is a front view of a display panel for an automobile instrument according to an embodiment as viewed from the front side.
FIG. 2 is a cross-sectional view of a display panel for an automobile instrument according to the present embodiment.
[Explanation of symbols]
10 ... Display panel for automobile instrument 12 ... First warning section (warning section)
16 ... 2nd warning part (warning part)
17 ... Third warning section (warning section)
25 ... Translucent display substrate 27 ... Receptive layer 28 ... Light-shielding printing layer (printing layer)
29 ... Backlight (light source)
30 ... light T1, T2 ... thickness

Claims (5)

A translucent display substrate (25) that transmits light (30) emitted from a light source (29); a receiving layer (27) formed on at least one side of the translucent display substrate (25); An automotive instrument display board comprising a light-shielding printed layer (28) formed on the layer (27),
Among the parts of the display panel (10), the thickness (T1) of the receiving layer (27) in the warning part (12, 16, 17) is formed thinner than the thickness (T2) in the other parts ,
The area ratio of black ink in the light-shielding print layer (28) of the warning part (12, 16, 17) is the area ratio of black ink in the light-shielding print layer (28) of the light-shielding part (22) among the other parts. A display board for an automobile instrument characterized by being lower than the rate .   By removing the receiving layer (27) in the warning part (12, 16, 17) by laser processing, the thickness (T1) of the receiving layer (27) of the warning part (12, 16, 17) is changed to another part. The display panel for automobile instruments according to claim 1, wherein the display panel is thinner than the thickness (T2). Of the portion of the display plate (10) in the translucent display substrate (25) having the receiving layer (27) formed on at least one side, the surface side of the receiving layer (27) in a part (12, 16, 17) By removing by laser processing, the thickness (T1) of the receiving layer (27) of a part (12, 16, 17) is made thinner than the thickness (T2) of another part, and this receiving layer ( comprises a step of forming a light-shielding printed layer (28) on top of 27),
The area ratio of the black ink in the light shielding printing layer (28) of the part (12, 16, 17) is the area ratio of the black ink in the light shielding printing layer (28) of the light shielding portion (22) among the other parts. The manufacturing method of the display board for motor vehicle instruments characterized by having made it lower . Forming a light-shielding printed layer (28) on the receiving layer (27) of the translucent display substrate (25) having the receiving layer (27) formed on at least one surface; and a portion of the display board (10) Is removed from the surface side of the light-shielding printing layer (28) by laser processing, thereby the thickness (27) of the receiving layer (27) of the portion (12, 16, 17) ( T1) is formed thinner than the thickness (T2) of the other part, and black ink is sprayed on the receiving layer (27) , whereby the light-shielding printing layer of the part (12, 16, 17). A display for an automobile instrument comprising: making the area ratio of the black ink in (28) lower than the area ratio of the black ink in the light-shielding print layer (28) of the light-shielding portion (22) among the other portions. A manufacturing method of a board.   The method for manufacturing a display panel for an automobile instrument according to claim 3 or 4, wherein the portions (12, 16, 17) made thinner than the thickness (T2) of the receiving layer (27) in other portions are warnings. A light-shielding printing layer (28) on the receiving layer (27) having a thickness (T1) of the warning portion (12, 16, 17) and a receiving layer (27) having a thickness (T2). A method for manufacturing a display panel for an automotive instrument, comprising a step of forming the same color as the light-shielding printed layer (28) formed on the substrate and lowering the light-shielding property.

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