JP2014035538A - Display board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display board free from the possibility that the display quality is deteriorated even when a plurality of gradation parts are formed in a thickness direction of a base plate.SOLUTION: The display board includes: a light-transmitting base plate 56; a first gradation part 53 formed in one surface 56a of the base plate 56; and a second gradation part 54 formed on the surface of the first gradation part 53. The first gradation part 53 has an aperture density of dots gradually reduced toward a radial direction from a first position P1. The second gradation part 54 has the aperture density of dots gradually reduced toward the radial direction from a second position P2 and is overlapped with a part of the first gradation part 53 in a thickness direction Z of the base plate 56. The aperture density of the dots of the first gradation part 53 is smaller than the aperture density of the dots of the second gradation part 54 in a dot overlapping area S.

Description

  The present invention relates to a display panel in which a plurality of gradation portions are formed on a light transmissive substrate.

  Conventionally, as for this kind of display board, what is indicated in the following patent documents 1, for example is known. The display plate described in Patent Document 1 is a first gradation portion formed by screen printing in a gradation shape in which brightness (dot opening density) gradually changes due to halftone dots (dots) on the surface of a light-transmitting substrate. And a second gradation portion formed by screen printing in a gradation shape in which the brightness (dot opening density) gradually changes due to halftone dots (dots) on the back surface of the light-transmitting substrate. It will be.

JP 2005-31634 A

In the case of the display plate described in Patent Document 1 described above, in the thickness direction of the substrate, a region having a small dot opening density in the first gradation portion and a region having a low dot opening density in the second gradation portion overlap each other. It is possible. At this time, if the dot patterns in both gradation portions are misaligned due to printing misalignment, a moire pattern is generated due to the interference effect (moire effect) between the dot patterns in the stacked relationship, and the display quality may be deteriorated.
SUMMARY OF THE INVENTION In order to address the above-described problems, an object of the present invention is to provide a display plate that does not cause a deterioration in display quality even when a plurality of gradation portions are formed in the thickness direction of the substrate. It is.

  The present invention includes a light-transmitting substrate, a first gradation portion formed on one surface of the substrate facing the viewer side, and a second gradation portion formed on the surface of the first gradation portion. And the first gradation portion has a dot aperture density that gradually decreases from the first position in the radial direction with respect to the first position, and the second gradation portion includes the first gradation portion, The aperture density of the dots gradually decreases from the second position different from the first position in the radial direction, and overlaps a part of the first gradation portion in the thickness direction of the substrate, In the dot overlap region where the first gradation portion and the second gradation portion overlap each other, the aperture density of the dots in the first gradation portion is that of the second gradation portion. And wherein the smaller than the opening density of Tsu and.

  The present invention also provides a light-transmitting substrate, a first gradation portion formed on the other surface of the substrate opposite to the viewer side, and the substrate and the first gradation portion. A second gradation portion formed, wherein the first gradation portion has a dot aperture density that gradually decreases in a radial direction from the first position with respect to the first position, In the second gradation portion, the aperture density of the dots gradually decreases from the second position different from the first position in the radial direction, and the first gradation portion has the first gradation portion in the thickness direction of the substrate. In the dot overlap region where the first gradation portion and the second gradation portion overlap each other, the dot density of the dots in the first gradation portion is the second density. And wherein the smaller than the opening density of the dots of the gradation portion.

  Further, according to the present invention, the aperture density of the dots in the first gradation portion gradually decreases from the first position toward the radial direction, and accordingly from 50% to 0%, and the second gradation portion. The aperture density of the dots in the gradation portion is gradually decreased from 100% to 50% in the radial direction from the second position located outside the first position. .

  In the dot overlap region, the present invention is characterized in that the opening density of the dots in the first gradation portion is 10% or less, and the opening density of the dots in the second gradation portion is 90% or more. To do.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where a several gradation part is formed in the thickness direction of a board | substrate, the initial objective can be achieved and the display board without a possibility that display quality may fall can be provided.

Sectional drawing of the instrument for vehicles by embodiment of this invention. The front view of the display board by the embodiment. AA sectional drawing of FIG. The figure which shows the 1st, 2nd gradation part by the embodiment separately.

  Hereinafter, the case where the embodiment of the present invention is applied to a display panel for an instrument mounted on a vehicle instrument (speedometer) will be described as an example with reference to FIGS.

  In FIG. 1, the speedometer according to the present embodiment includes a circuit board 10, a driving device 30 that is conductively attached to the circuit board 10 and has a rotating shaft 20 extending forward, and a pointer 40 that is rotationally driven by the rotating shaft 20 A display plate 50 disposed on the circuit board 10 positioned behind the pointer 40, a turning plate 60 for exposing the pointer 40 and the display plate 50, a pointer light source 70 for illuminating the pointer 40, and a display The light source 80 which illuminates the board 50, and the case body 90 arrange | positioned between the circuit board 10 and the display board 50 are comprised.

  The circuit board 10 is made of, for example, a hard wiring board in which a wiring pattern (not shown) is provided on a glass epoxy base material, and driving means (drive means for driving and controlling the pointer light source 70, the light source 80, and the driving device 30). (Not shown) and various circuit components (not shown) such as a resistor and a capacitor are conductively connected to the wiring pattern.

  The driving device 30 is composed of a movable magnet type instrument or a stepping motor, and its main part is mounted behind the circuit board 10 so that the rotating shaft 20 penetrates the circuit board 10 and is appropriately connected by means such as soldering. It is electrically connected to the wiring pattern (the driving means).

  The pointer 40 is made of a light-transmitting synthetic resin, is connected to the tip of the rotating shaft 20, and a light-shielding cover is attached to the center of rotation. The pointer 40 is a light-emitting pointer that emits light upon receiving illumination light from the pointer light source 70.

  As shown in FIG. 2, the display board 50 has an arcuate arrangement along the rotation trajectory (operation range) of the pointer 40 and has an index portion 51 including a speed number 51 a and a speed scale 51 b indicated by the pointer 40. And a gradation region 52 formed of a gradation pattern that forms the background of the indicator portion 51.

  In the case of this example, the gradation area 52 is composed of a first gradation layer 53 as a first gradation portion, a second gradation 54 layer as a second gradation portion, and a ground layer 55. Is formed.

  FIG. 3 is a cross-sectional view of the main part of the display board 50 showing the lamination relationship of the gradation layers 53 and 54 and the base layer 55. In this case, the light-transmitting property that is the base material of the display board 50 is shown. A base layer 55 is printed on the surface of the substrate 56, and a first gradation layer 53 is printed on the surface of the base layer 55 (that is, the surface side of the substrate 56 via the base layer 55). The second gradation 54 layer is printed on the surface of the layer 53. Here, the surface (front surface side) of the substrate 56 means one surface 56a of the substrate 55 facing the pointer 40 side (that is, the observer side).

  Further, the gradation layers 53 and 54 and the underlayer 55 are composed of the first gradation layer 53 made of, for example, blue translucent ink, and the second gradation layer 54 made of, for example, dark blue translucent ink. 55 is printed and formed on the surface (one surface 56a) of the substrate 56, for example, with white translucent ink.

  In the first gradation layer 53, the aperture density of dots gradually decreases from the first position P1 toward the radial direction (speed scale 51b side) with reference to the first position P1 in FIG. 4 (FIG. 3). A dot density changing area 53a, and a dot area having a 0% dot density (solid printing area), and a colored area 53b formed outside the dot density changing area 53a so as to be continuous with the dot density changing area 53a. have. Here, the first position P1 is a position corresponding to the inner peripheral surface of a circular through-hole portion 57 provided at the center of the display panel 50 so that the rotary shaft 20 penetrates.

  Then, the dot density of the dot density changing region 53a provided in the first gradation layer 53 is 50% to 0% from the first position P1 in the radial direction (speed scale 51b side). Gradually decreasing.

  Specifically, the dot opening density at the first position P1 is 50%, and the dot opening density gradually decreases from the first position P1 toward the speed scale 51b side, and the first gradation layer. In the dot overlap region S where 53 and the second gradation layer 54 overlap, the dot opening density is set to 0% at the solid print start position Q outside the dot overlap region S.

  On the other hand, in the second gradation layer 54, the aperture density of dots gradually decreases from the second position P2 different from the first position P1 in the radial direction (speed scale 51b side). Note that the second position P2 here is outside the first position P1, and in the dot overlap area S, the inside of the dot overlap area S that is opposite to the solid print start position Q. It corresponds to the position.

  Then, the aperture density of dots in the second gradation layer 54 is 100% to 50% from the second position P2 located outside the first position P1 toward the radial direction (speed scale 51b side). As shown in FIG.

  Specifically, the dot opening density at the second position P2 is 100%, and the dot opening density gradually decreases from the second position P2 toward the speed scale 51b, and the peripheral edge of the display board 50 is increased. The dot opening density is set to 50% at the portion.

  Here, when attention is paid to the positional relationship between the first gradation layer 53 and the second gradation 54 layer when the display board 50 is viewed from the viewer side, the second gradation 54 layer is as shown in FIG. Laminated on the surface of the first gradation layer 53 so as to overlap a part of the first gradation layer 53 (specifically, a part of the dot density changing region 53a and the colored region 53b) in the thickness direction Z of the substrate 56. Is formed.

  In particular, in the case of this example, in the dot overlap region S, the dot opening density of the dot density changing region 53a (first gradation layer 53) is made smaller than the dot opening density of the second gradation layer 54. More specifically, in the dot overlap region S, the dot opening density of the dot density changing region 53a in the first gradation layer 53 is about 0% to 10% (10% or less). The aperture density of dots in the second gradation layer 54 is about 90% to 100% (90% or more).

  Therefore, as shown in FIG. 4, in the dot overlap region S, one gradation layer located on the upper side of the two gradation layers to be laminated (in this example, located on the upper side among the gradation layers 53 and 54). The gradation of the second gradation layer 54) is relatively light, and conversely, the other gradation layer (in this example, the first gradation located on the lower side of the gradation layers 53 and 54). Since the density of the layer 53) is relatively dark, even if the second gradation layer 54 is displaced due to printing misalignment, for example, the generation of moire patterns is suppressed as much as possible, and the radial direction is directed from the through hole 57. A smooth gradation display can be realized.

  The facing plate 60 exposes the pointer 40 and the indicator 51 and hides other required areas. The facing plate 60 includes an opening 61 for exposing the pointer 40 and the indicator 51.

  The pointer light source 70 is composed of, for example, a chip-type light emitting diode that emits red light. A plurality of pointer light emitting diodes are arranged near the rotation center of the pointer 40 and are stored in a cylindrical portion (described later) of the case body 90 to emit light in red. Is the body.

  The light source 80 is formed of a chip-type light emitting diode that emits white light, for example, and is disposed behind the display panel 50. In this case, the light source 80 is a light emitter that is disposed to face a first reflecting portion (described later) of the case body 90 and supplies illumination light to the display panel 50.

  The case body 90 is made of, for example, white synthetic resin, and functions as a holding body that holds the display board 50, functions as a housing that houses the pointer light source 70 and the light source 80, and from the pointer light source 70 and the light source 80. It has a function as a reflector that reflects the illumination light forward.

  The case body 90 stores the pointer light source 70 and displays the cylindrical portion 101 for supplying the illumination light from the pointer light source 70 to the rotation center portion of the pointer 40 and the cylindrical portion 101 so as to surround the cylindrical portion 101. A first reflecting portion 92 that inclines toward the plate 50 and faces the light source 80, and a dish shape that faces the first reflecting portion 92 and the display plate 50 and approaches the display plate 50 as it moves away from the rotary shaft 20. And a second reflecting portion 93 made of an annular wall.

  Further, in this case, the first reflecting part 92 constitutes a reflecting surface that reflects the illumination light from the light source 80 mainly radially toward the outer periphery, and the second reflecting part 93 passes through the first reflecting part 92 to the outer periphery. The reflecting surface which reflects the illumination light reflected by the display board 50 side is comprised.

  As described above, in the present embodiment, the display board 50 provided in the speedometer includes the light transmissive substrate 56 and the first gradation layer formed on the one surface 56a of the substrate 56 facing the viewer side. 53 and a second gradation layer 54 formed on the surface of the first gradation layer 53. The first gradation layer 53 has a dot aperture density from the first position P1 toward the radial direction. As the second gradation layer 54 gradually decreases, the aperture density of the dots gradually decreases from the second position P2 in the radial direction, and the first gradation layer 53 in the thickness direction Z of the substrate 56 increases. In the dot overlap region S, the dot density of the first gradation layer 53 is smaller than the dot density of the second gradation layer 54. Than is. In the dot overlap region S, the dot density of the first gradation layer 53 is 10% or less, and the dot density of the second gradation layer 54 is 90% or more. .

  Accordingly, in the dot overlap region S, the gradation of the second gradation layer 54 located on the upper side of each gradation layer 53, 54 is relatively light. On the contrary, of the gradation layers 53, 54, Since the gradation of the first gradation layer 53 located on the lower side is relatively dark, even if the second gradation layer 54 is displaced due to printing misalignment, for example, the generation of moire patterns is suppressed as much as possible. A display panel with improved quality can be provided.

  In this embodiment, the gradation layers 53 and 54 and the base layer 55 are described as being formed on the surface (one surface 56a) of the substrate 56 on the viewer side. In addition, the base layer 55 may be provided on the back surface of the substrate 56 opposite to the viewer side (that is, the other surface of the substrate 56 opposite to the one surface 56a).

  In this case, the first gradation layer 53 is formed on the other surface side opposite to the observer side of the substrate 56, and the second gradation layer 54 is formed on the substrate 56 and the first surface. In the thickness direction Z of the substrate 56, the second gradation portion 54 is formed between the gradation portion 53 and the substrate 56 and the first gradation portion so as to overlap a part of the dot density changing region 53a and the coloring region 53b. 53 is formed.

50 Display board 51 Indicator section 52 Gradation area 53 First gradation layer (first gradation section)
53a Dot density change region 53b Colored region 54 Second gradation layer (second gradation part)
55 Underlayer 56 Substrate 56a One surface 57 Through-hole portion P1 First position P2 Second position S Dot overlap region

Claims (4)

A light transmissive substrate;
A first gradation portion formed on one surface facing the viewer side of the substrate;
A second gradation part formed on the surface of the first gradation part,
In the first gradation portion, the aperture density of dots gradually decreases from the first position toward the radial direction with respect to the first position,
The second gradation portion has a dot aperture density that gradually decreases in a radial direction from a second position different from the first position, and the first gradation portion in the thickness direction of the substrate. Part of
In the dot overlap region where the first gradation portion and the second gradation portion overlap each other, the opening density of the dots in the first gradation portion is smaller than the opening density of the dots in the second gradation portion. Characteristic display board. A light transmissive substrate;
A first gradation portion formed on the other surface of the substrate opposite to the viewer side;
A second gradation part formed between the substrate and the first gradation part,
In the first gradation portion, the aperture density of dots gradually decreases from the first position toward the radial direction with respect to the first position,
The second gradation portion has a dot aperture density that gradually decreases in a radial direction from a second position different from the first position, and the first gradation portion in the thickness direction of the substrate. Part of
In the dot overlap region where the first gradation portion and the second gradation portion overlap each other, the opening density of the dots in the first gradation portion is smaller than the opening density of the dots in the second gradation portion. Characteristic display board. The aperture density of the dots in the first gradation portion gradually decreases from 50% to 0% in the radial direction from the first position, and the dot density of the dots in the second gradation portion. The aperture density is gradually decreased from 100% to 50% in a radial direction from the second position located outside the first position. Item 3. The display board according to Item 2. 2. The dot density in the first gradation portion is 10% or less in the dot overlap region, and the dot density in the second gradation portion is 90% or more. The display board as described in any one of Claim 3.

Images