JP4826875B2 - Display board - Google Patents

Description

The present invention is, for example automobiles, motorcycles, agricultural machinery, construction machinery, mounted on a ship, to a display board such as an instrument panel that is transparently illuminated with illumination light from a light source.

Conventionally, for example, a display plate described in Patent Document 1 below is known as this type of display plate . In the display plate described in the publication, a transmission part that transmits light from the light source to the front side is formed, and a transmission light adjustment layer formed of a dot pattern that changes the amount of transmitted light according to the plane direction is formed in the transmission part. As the light from the light source passes through the transmitted light adjustment layer, color gradation illumination is performed in which the brightness of the transmissive part and the color tone of the display panel gradually change according to the plane direction when viewed from the observer. The lighting design has a sense of depth and three-dimensionality.

In the display board , the transmitted light adjustment layer having a common dot pattern is printed a plurality of times, so that the transmitted light adjustment layer is separated in the thickness direction of the display board to form a plurality of layers (two layers), and color gradation In addition to improving the appearance quality and color developability, the interference pattern (moire pattern) that occurs due to printing misalignment when the transmitted light adjustment layer is multilayered by interposing a diffusion layer between each transmitted light adjustment layer Is suppressed.

JP 2004-093235 A

However, the display board described in the above publication is effective against interference patterns, but has a problem that it cannot cope with the following problems. That is, when the multi-layered dot pattern layer is displaced in the plane direction, the coverage area (printing area) per unit area by the dot pattern layer is increased, and the width of the transmission part is particularly large in a region having a high coverage area ratio (light shielding ratio). There is a problem that a narrowing phenomenon that looks narrow or a tone jump phenomenon that a part of the transmission part is visually recognized in a line shape may occur, and this imposes pressure on the product yield.
Accordingly, the present invention provides a display panel capable of suppressing the deterioration of the yield due to printing misalignment in order to cope with the above-described problems.

In order to achieve the above object, the present invention provides a display panel of an instrument panel that is transmitted and illuminated by a light source disposed behind, and a transmission portion that transmits light from the light source forward is formed on the display board.
The transmissive portion has a transmitted light adjustment layer formed of a dot pattern layer that changes the amount of transmitted light according to the planar direction, and the transmitted light adjustment layer is separated and formed in the thickness direction of the display panel. An adjustment layer and a second transmitted light adjustment layer are configured, and the first dot pattern layer and the second transmitted light adjustment layer that configure the first transmitted light adjustment layer among the dot pattern layers are configured. Both of the second dot pattern layers are composed of positive dots formed by forming the transmitted light adjusting layer in a dot shape and negative dots formed by extracting the transmitted light adjusting layer in a dot shape, and the first In the second dot pattern layer, each of the positive dots and each of the negative dots are opposed to each other, and the size of the covering portion of the positive dots in the first dot pattern layer is set to the second dot pattern layer. Of the dot pattern layer And forming the size of the negative dot removal portion of the first dot pattern layer to the size of the negative dot removal portion of the second dot pattern layer. By forming smaller than the size, the covering area per unit area of the first transmitted light adjusting layer is set larger than the covering area per unit area of the second transmitted light adjusting layer, and the first dots The pattern layer is positioned closer to the light source than the second dot pattern layer .

In the invention, it is preferable that the first dot pattern layer and the second dot pattern layer have a common dot shape .

According to the present invention, in a display panel of an instrument panel that is transmitted and illuminated by a light source disposed behind, a transmission part that transmits light of the light source forward is formed on the display board, and the transmitted light is transmitted to the transmission part. A transmission light adjustment layer comprising a dot pattern layer that changes the amount of light according to a planar direction, and the transmission light adjustment layer is separated and formed in the thickness direction of the display panel; and at least a first transmission light adjustment layer and a second transmission A first dot pattern layer that constitutes the first transmitted light adjustment layer and a second dot pattern layer that constitutes the second transmitted light adjustment layer of the dot pattern layer. The first and second dot pattern layers are both composed of positive dots formed by forming the transmitted light adjustment layer in a dot shape and negative dots formed by extracting the transmitted light adjustment layer in a dot shape. In the positive type Each of the dots and the negative type dots are opposed to each other, and the size of the positive type dot covering part of the first dot pattern layer is set to the positive type dot covering part of the second dot pattern layer. And the first dot pattern layer is formed with a negative dot removal portion smaller than the negative dot removal portion of the second dot pattern layer. The covering area per unit area of the transmitted light adjusting layer is set to be larger than the covering area per unit area of the second transmitted light adjusting layer, and the first dot pattern layer is made of light-transmitting ink. And forming the second dot pattern layer with an ink having a light shielding property, positioning the first dot pattern layer closer to the light source than the second dot pattern layer, and Wherein the light of said light source transmitted through the dot pattern layer of becoming partially shielded by the second dot pattern layer.

  According to the present invention, it is possible to provide an illuminating device that can achieve the initial purpose and can suppress the deterioration of the yield due to the printing misalignment.

Hereinafter, an embodiment in which the display board of the present invention is applied to a vehicle indicating instrument will be described with reference to FIGS. 1 to 11. FIG. 1 is a front view of the indicating instrument , and FIG. FIG. 3 is a partial cross-sectional view of a region indicated by an arrow B in FIG. 1, FIG. 4 is a front view of an essential part showing a transmitted light adjustment layer, and FIG. 5 is each dot pattern constituting the first and second transmitted light adjustment layers. FIG. 6 is a schematic diagram showing the layers in a simplified manner, FIG. 6 is a diagram showing the size of each arbitrary positive type dot relative to the thickness direction, and FIG. 7 is a diagram when each dot shown in FIG. 6 is cut in the diameter direction. FIG. 8 is a diagram showing the size of each arbitrary negative dot relative to the thickness direction, FIG. 9 is a diagram when each dot shown in FIG. 8 is cut in the diameter direction, and FIG. 10 is an arbitrary relative to the thickness direction. FIG. 11 is a diagram showing a case where the positive type dot is displaced, FIG. 11 is a case where an arbitrary negative type dot relative to the thickness direction is displaced It is a diagram illustrating a case.

  The indicating instrument according to the present embodiment is fixed to the distal end side of the rotating shaft 2 of the instrument main body 1, and a pointer 3 that rotates around the rotating shaft 2, and a scale or numeral that is positioned on the back side of the pointer 3 and is transmitted and illuminated. A display board 5 provided with an indicator portion 4 composed of a symbol and a symbol, a hard circuit board 6 made of glass epoxy resin located on the back side of the display board 5, and a pointer provided on the circuit board 6 respectively. 3 and light sources 7 and 8 for illuminating the display board 5, and a synthetic resin frame 9 that partitions an illumination area for illuminating the pointer 3 and an illumination area for illuminating the display board 5. The instrument body 1 is disposed behind the circuit board 6, and the rotating shaft 2 passes through the circuit board 6.

  For example, a light emitting diode that emits red light is used as the light source 7 that illuminates the pointer 3, and is located in the cylindrical partition wall 9 </ b> A provided in the frame body 9, and the rotation shaft 2 is centered in the vicinity of the rotation shaft 2. A plurality of circular shapes are provided. A light guide 10 is disposed between the light source 7 and the pointer 3 to guide the light emitted from the light source 7 toward the pointer 3 side.

  For example, a light emitting diode that emits white light is used as the light source 8 that transmits and illuminates the display panel 5, and a plurality of light emitting diodes are provided around the outside of the partition wall 9 </ b> A in a circular shape. Between the light source 8 and the display board 5, a light guide 11 for guiding the light emitted from the light source 8 toward the display board 5 is disposed, and the frame body 9 faces the back surface of the display board 5. The reflecting portion 9B is formed so as to be gradually approached to the display plate 5 as the distance from the rotating shaft 2 increases, and light emitted from an irradiation portion described later of the light guide 11 is emitted. Is repeatedly reflected between the display panel 5 and the display panel 5.

  The light guide 11 and the guide illumination light guide 10 are integrally formed through the connecting portion 12 and supported by the frame 9. As the material of each of the light guides 10 and 11, for example, a light-transmitting synthetic resin such as polycarbonate or acrylic is used, and in the present embodiment, a colorless and transparent material with no color is used.

  The light guide 11 that illuminates the display plate 5 includes a light receiving portion 11A that receives light from the light source 8, and a reflective surface 11B that guides light rays received by the light receiving portion 11A to the display plate 5 side. The light receiving portion 11A is formed to protrude corresponding to the light source 8, the reflection surface 11B has an inverted conical surface shape surrounding the rotation shaft 2, and the cross-sectional shape of the reflection surface 11B is the light beam received by the light reception portion 11A along the rotation shaft 2. It is formed by a plurality of inclined planes that reflect in the center radial direction. Further, the light guide 11 is formed with an irradiation portion 11C that emits the light radially reflected by the reflection surface 11B to the reflection portion 9B. In the present embodiment, the cross-sectional shape is formed in a plane. .

  Next, the detailed structure of the display board 5 is demonstrated. The display board 5 includes a flat substrate 51 made of a synthetic resin that is substantially colorless and translucent, such as polycarbonate or acrylic, and a plurality of printed layers printed on the substrate 51 by means such as screen printing. 1 and FIG. 3, a plurality of indicator portions 4 having translucency such as scales, numbers, or symbols corresponding to the pointer 3, and including these indicator portions 4, “C” It has a transmissive part 5A extending in a letter shape and a ground color part 5B that forms the background of the transmissive part 5A and the indicator part 4.

  As shown in FIG. 3, the print layer 52 has a first transmitted light adjustment layer 521, a first diffusion layer 522, a first ground color layer 523, and a second diffusion layer 524 in the order of printing on the substrate 51. The second transmitted light adjustment layer 525, the second ground color layer 526, and the protective layer 527, and only the ground color layers 523 and 526 are formed using the light-shielding ink, and all others are made of the light-transmitting ink. Is formed.

  The first and second ground color layers 523 are both made of, for example, black ink, and the first ground color layer 523 covers the entire substrate 51 except for the portions to be the indicator portion 4 and the transmission portion 5A. When the display panel 5 is viewed from the front, the ground color portion 5B serving as the background of the transmission portion 5A and the indicator portion 4 and the first edge portion 4A that borders the indicator portion 4 are provided. Form. On the other hand, the second ground color layer 526 is formed only in a region located on the front side of the second diffusion layer 524 and excluding the four indicator portions, and the second edge portion together with the first edge portion 4A. 4B is formed.

  As shown in FIG. 4, the first and second transmitted light adjustment layers 521 and 525 are composed of dot-shaped dot pattern layers DP1 and DP2, and the amount and color of transmitted light passing through the transmission portion 5A are determined in the plane direction. Gradually change according to

  The dot patterns of the dot pattern layers DP1 and DP2 are common to the first and second transmitted light adjustment layers 521 and 525, but the dot pattern layer DP1 of the first transmitted light adjustment layer 521 is, for example, light transmissive. The dot pattern layer DP1 of the second transmitted light adjustment layer 525 is formed of, for example, a light-shielding black ink, and the dots DT1 and DT2 (which form the dot pattern layers DP1 and DP2 ( 5), the coverage area per unit area (the total coverage area of the dot pattern layers DP1 and DP2 when the display panel 5 is viewed from the front) gradually increases as the distance from the rotation axis 2 increases. Yes.

  Accordingly, the amount of transmitted light emitted from the light source 8 and passing through the transmission part 5A to the front side of the display plate 5 gradually decreases as the distance from the rotation axis 2 increases, and the illumination color of the transmission part 5A rotates accordingly. A radial color gradation changing from white to light blue to dark blue (dark blue) to black from the side close to the axis 2 is formed.

  In the first diffusion layer (diffusion layer) 522 and the second diffusion layer (diffusion layer) 524, the first diffusion layer 522 overlaps the first transmitted light adjustment layer 521, and the second diffusion layer 524 is the second diffusion layer 524. In this example, the first diffusion layer 522 is closer to the light source 8 than the second diffusion layer 524 is formed so as to overlap the transmitted light adjustment layer 525. Is located.

  The first diffusion layer 522 is formed of a colored layer formed using, for example, a translucent (semi-transparent) ink colored milky white, and has a coloring function that determines the illumination color (white) of the transmission portion 5A, 1 has a function of diffusing transmitted light that passes through one transmitted light adjustment layer 521 and travels toward the second transmitted light adjustment layer 525.

  On the other hand, the second diffusion layer 524 is composed of a non-colored transparent layer mixed with light diffusing particles 524A (for example, colorless and transparent) having translucency having a particle size of 2 to 14 microns, for example. The light transmitted through 522 toward the second transmitted light adjustment layer 525 is efficiently diffused with irregular reflection by the light diffusing particles 524A.

  The protective layer 527 is composed of an overcoat layer that protects the surface of the display panel 5 and covers the entire surface of the display panel 5.

  In addition, the indicator part 4 portion bordered by the border parts 4A and 4B includes a first transmitted light adjustment layer 521, a first diffusion layer 522, a ground color layer 523, a second diffusion layer 524, and a second transmission. The light adjustment layer 525 is not formed, and only the protective layer 527 is formed, thereby improving the discriminability of the indicator portion 4 together with the edge portions 4A and 4B.

  In FIG. 3, only the index part 4 made up of numbers has been described, but the scales and symbols have the same printing configuration as the numbers.

Next, details of the dot pattern layers DP1 and DP2 will be described with reference to FIGS.

  5A shows the second dot pattern layer DP2 (horizontal line pattern) constituting the second transmitted light adjustment layer 525, and FIG. 5B shows the first dot constituting the first transmitted light adjustment layer 521. A pattern layer DP1 (hatched pattern) is shown, and both patterns are configured by combining round dots DT1 and DT2. These dots DT1 and DT2 are composed of positive dots DT1p and DT2p and negative dots DP1n and DP2n. In the figure, the dots per unit area increase from the right side (the side closer to the rotation axis 2) to the left. The covering area is set to be large.

  6A and 7B, (a) shows the positive dot DT2p (horizontal line pattern) of the second dot pattern layer DP2, and (b) shows the positive dot DT1p (hatched pattern) of the first dot pattern layer DP1. ), The size (diameter) S1 of the covering portion of the positive type dot DT1p and the size (diameter) S2 of the covering portion of the positive type dot DT2p are “S1> S2”. Thus, the covering area per unit area in the first transmitted light adjustment layer 521 is set to be larger than the covering area per unit area in the second transmitted light adjustment layer 525.

  8 and 9, (a) shows the negative dot DT2n (horizontal line pattern) of the second dot pattern layer DP2, and (b) shows the negative dot DT1n (hatched line) of the first dot pattern layer DP1. Pattern), the size (diameter) S3 of the negative portion of the negative dot DT1n and the size (diameter) S4 of the negative portion of the negative dot DT2n are set to “S3 <S4”. Thereby, the covering area per unit area in the first transmitted light adjustment layer 521 is set to be larger than the covering area per unit area in the second transmitted light adjustment layer 525.

  As described above, the first and second transmitted light adjustment layers 521 and 525 have the same amount of the first transmitted light adjustment layer 521 per unit area as the positive dots DT1p and DT2p and the negative dots DT1n and DT2n. The covering area is large. In the case of this example, the light from the light source 8 passes through the first dot pattern layer DP1, and then is blocked (light-shielded) by the second dot pattern layer DP2. Since the covering area of the first dot pattern layer DP1 is relatively larger than that of the dot pattern layer DP2, the light (blue light) transmitted through the first dot pattern layer DP1 is blocked by the second dot pattern layer DP2. No light (see the transmission range TR corresponding to S1-S2 in FIG. 7 and the transmission range TR corresponding to S4-S3 in FIG. 9) is transmitted forward. In this way, each basic setting of the dot patterns DP1 and DP2 is determined as follows: “Coating area per unit area of the first transmitted light adjustment layer 521 having transparency> unit in the second transmitted light adjustment layer 525 having light shielding properties By providing a transmission area corresponding to the transmission range TR, it is possible to have an illumination function that approximates the Hallo (back light or back light) effect, thereby providing high-quality gradation illumination. It can be carried out.

  Next, based on FIG. 10 and FIG. 11, a case where the respective dot pattern layers DP1 and DP2 that are opposed to each other due to printing misalignment will be described.

  In FIG. 10, the positive type dots DT1p and DT2p (the center positions thereof) are shifted in the left-right direction in the figure, and as a result, the transmission region TR has a large area on the left side and a small area on the right side in the figure. Although the left and right balance of the blue light emission area is lost due to the ring shape, the positive dot DT2p is formed smaller than DT1p, and the covering area per unit area of the positive dot DT2p is set as the unit area of the positive dot DT1p By making it smaller than the per-covered area, the influence of the deviation is suppressed to such an extent that the left-right balance of the blue light emitting area is slightly lost.

  That is, if the positive dot DT2p has the same size as DT1p (see the dot-dash line in the figure), the right half (or more) of the transmission region TR is shielded and the influence is large. By forming the dots DT2p smaller than DT1p, the width balance of the transmission region TR is suppressed to such an extent that it is lost.

  In FIG. 11, the negative dots DT1n and DT2n are shifted in the horizontal direction in the drawing (the center position thereof). As a result, the transmission area TR has a large area on the left side as in FIG. The right-hand side area is a small ring shape, and the left-right balance of the blue light emission area is lost. However, the negative dot DT1n is formed smaller than DT2n, and the covering area per unit area of the negative dot DT2n is negative. By forming the dot DT1n smaller than the covering area per unit area, the influence of the deviation is suppressed to such an extent that the left-right balance of the blue light emitting area is slightly broken.

  That is, if the negative dot DT1p has the same size as DT2n (see the dashed line in the figure), the right half (or more) of the transmission region TR is shielded, and the influence is large. By forming the dots DT1n smaller than DT2n, the width balance of the transmission region TR is suppressed to such an extent that it is lost.

As described above, in the present embodiment, as described, in the display panel 5 to be transmitted illumination by the light source 8 disposed behind the table示板5 forms a transmission section 5A which transmits light of the light source 8 to the front side, the transmission The part 5A has transmitted light adjustment layers 521 and 525 having dot patterns that change the amount of transmitted light according to the planar direction, and the transmitted light adjustment layers 521 and 525 are separated and formed in the thickness direction of the display panel 5. The first transmitted light adjustment layer 521 and the second transmitted light adjustment layer 525 are different, and the area covered by the dot pattern is different between the first and second transmitted light adjustment layers 521 and 525. That is, the dot patterns DP1 and DP2 constituting the first and second transmitted light adjustment layers 521 and 525 have different sizes of the dots DT1 and DT2 facing the thickness direction of the display panel 5, respectively. Thus, the dot patterns DP1 and DP2 are set to have different coverage areas per unit area, so that the influence of printing misalignment can be minimized and the yield rate can be improved.

  In the present embodiment, the first transmitted light adjustment layer 521 has light transmittance, and the second transmitted light adjustment layer 525 has light shielding properties, so that a high-quality color gradation can be obtained. That is, color rendering is performed with a light-transmitting colored ink that has high color rendering properties (colorability) by light transmission but low light concealment properties (light-shielding properties), and color rendering (coloring) is impossible. By adjusting the transmittance with a highly light-shielding ink, the concealability can make use of the advantages of the ink properties, complement the disadvantages, and reproduce a high-quality color gradation.

  Further, in the present embodiment, the first transmitted light adjustment layer 521 is positioned closer to the light source 8 than the second transmitted light adjustment layer 525, and the dot pattern DP1 constituting the first transmitted light adjustment layer 521 is included. Illumination that approximates the Hallo (back light or back light) effect by having the coverage area or the size of the dot DT1 larger than the coverage area or the size of the dot DT2 of the dot pattern DP2 constituting the second transmitted light adjustment layer 525 Thus, it is possible to perform gradation lighting with a high-class feeling.

  In the present embodiment, the dots DT1 and DT2 have round shapes, but the shapes such as squares and rhombus are arbitrary, and different shapes may be combined.

  Further, in the present embodiment, the positive type DT1p and DT2p and the negative type dots DT1n and DT2n are combined, but either a positive type or a negative type may be used.

  In the present embodiment, the covering area by the dot pattern is set to be different between the first and second transmitted light adjustment layers 521 and 525 in the entire transmission portion 5A. It may be different.

  In the present embodiment, the first transmitted light adjustment layer 521 is blue, but any color can be used.

  Further, both the first and second transmitted light adjustment layers 521 may be light-shielding or transmissive.

  Further, in this embodiment, the coverage area of the first transmitted light adjustment layer 521 is increased, but the coverage area of the second transmitted light adjustment layer 525 may be increased.

  In this embodiment, the transmissive part 5A formed on the display panel 5 is formed in a “C” shape and the transmitted light adjustment layers 521 and 525 are provided corresponding to the transmissive part 5A. The shape is arbitrary. For example, the indicator part 4 or the ground color part 5B may be used as the transmission part 5A, and the transmitted light adjustment layers 521 and 525 may be provided in this part.

  In this embodiment, the transmitted light adjustment layers 521 and 525 are two layers, but three or more layers may be formed.

The front view which shows one Embodiment of the indicating instrument by this invention. AA sectional drawing of FIG. The fragmentary sectional view of the arrow B area | region of FIG. The principal part front view which shows the transmitted light adjustment layer. It is a schematic diagram which shows each dot pattern layer which comprises the 1st, 2nd transmitted light adjustment layer simplified, (a) is the dot pattern layer of the 2nd transmitted light adjustment layer, (b) is the 1st The dot pattern layer of the transmitted light adjustment layer of FIG. It is a figure which shows each magnitude | size of the arbitrary positive type | mold dots opposite to a thickness direction, (a) is a magnitude | size of the positive type dot of a 2nd transmitted light adjustment layer, (b) is 1st permeation | transmission. The figure which shows the magnitude | size of the positive type dot of a light adjustment layer, respectively. FIG. 7 is a diagram in the case where each dot shown in FIG. 6 is cut in the diameter direction, where (a) is a positive dot of the second transmitted light adjustment layer, and (b) is a positive type of the first transmitted light adjustment layer. The figure which shows each dot. It is a figure which shows the magnitude | size of each arbitrary negative type | mold dot which opposes the thickness direction, (a) is the magnitude | size of the negative type dot of the 2nd transmitted light adjustment layer, (b) is 1st permeation | transmission. The figure which shows the magnitude | size of the negative type dot of a light adjustment layer, respectively. It is a figure at the time of cut | disconnecting each dot of FIG. 8 in the diameter direction, (a) is a negative type dot of the 2nd transmitted light adjustment layer, (b) is a negative type of the 1st transmitted light adjustment layer. The figure which shows each dot. The figure which shows the case where the arbitrary positive dots which oppose the thickness direction have shifted | deviated. The figure which shows the case where the arbitrary negative dots which oppose the thickness direction have shifted | deviated.

DESCRIPTION OF SYMBOLS 1 Instrument main body 2 Rotating shaft 3 Pointer 4 Indicator part 4A, 4B Edge part 5 Display board 5A Transmission part 5B Ground color part 6 Circuit board 7 Light source 8 Light source 9 Frame 9A Partition wall 9B Reflection part 10, 11 Light guide 11A Light reception Part 11B Reflective surface 11C Irradiation part 12 Connection part 51 Substrate 52 Print layer 521 First transmitted light adjustment layer 522 First diffusion layer 523 Ground color layer 524 Second diffusion layer 525 Second transmitted light adjustment layer 526 Second Ground color layer 527 Protective layer DP1, DP2 First and second dot pattern layers DT1, DT2 First and second dots DT1p, DT2p Positive type dots DP1n, DP2n Negative type dots S1 to S4 Diameter TR Transmission range

Claims (3)

In the display panel of the instrument panel that is transmitted and illuminated by the light source arranged behind,
Forming a transmission part that transmits light from the light source to the front side of the display board;
This transmission part has a transmitted light adjustment layer composed of a dot pattern layer that changes the amount of transmitted light according to the plane direction,
The transmitted light adjustment layer is composed of at least a first transmitted light adjustment layer and a second transmitted light adjustment layer that are separately formed in the thickness direction of the display panel,
Among the dot pattern layers, both the first dot pattern layer constituting the first transmitted light adjustment layer and the second dot pattern layer constituting the second transmitted light adjustment layer are used as the transmitted light adjustment layer. Consists of a positive dot formed in a dot shape and a negative dot formed by extracting the transmitted light adjustment layer into a dot shape,
In the first and second dot pattern layers, each of the positive type dots and each of the negative type dots are opposed to each other,
The positive dot covering portion of the first dot pattern layer is formed to be larger than the positive dot covering portion of the second dot pattern layer and the first dot pattern layer A covering area per unit area of the first transmitted light adjusting layer is formed by forming the size of the negative dot extraction portion smaller than the size of the negative dot extraction portion of the second dot pattern layer. Is set larger than the covering area per unit area of the second transmitted light adjustment layer,
The display panel, wherein the first dot pattern layer is positioned closer to the light source than the second dot pattern layer . 2. The display panel according to claim 1, wherein the first dot pattern layer and the second dot pattern layer have a common dot shape. In the display panel of the instrument panel that is transmitted and illuminated by the light source arranged behind,
Forming a transmission part that transmits light from the light source to the front side of the display board;
This transmission part has a transmitted light adjustment layer composed of a dot pattern layer that changes the amount of transmitted light according to the plane direction,
The transmitted light adjustment layer is composed of at least a first transmitted light adjustment layer and a second transmitted light adjustment layer that are separately formed in the thickness direction of the display panel,
Among the dot pattern layers, both the first dot pattern layer constituting the first transmitted light adjustment layer and the second dot pattern layer constituting the second transmitted light adjustment layer are used as the transmitted light adjustment layer. Consists of a positive dot formed in a dot shape and a negative dot formed by extracting the transmitted light adjustment layer into a dot shape,
In the first and second dot pattern layers, each of the positive type dots and each of the negative type dots are opposed to each other,
The positive dot covering portion of the first dot pattern layer is formed larger than the positive dot covering portion of the second dot pattern layer, and the negative type of the first dot pattern layer is formed. By forming the size of the dot extraction portion of the second dot pattern layer to be smaller than the negative dot extraction portion of the second dot pattern layer, the coverage area per unit area of the first transmitted light adjustment layer can be reduced. Set larger than the coating area per unit area of the transmitted light adjustment layer,
Forming the first dot pattern layer with a light-transmitting ink, and forming the second dot pattern layer with a light-blocking ink;
Positioning the first dot pattern layer closer to the light source than the second dot pattern layer;
The display panel, wherein the light from the light source that has passed through the first dot pattern layer is partially shielded by the second dot pattern layer.

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