JP6153091B2 - Display device - Google Patents

Description

  The present invention relates to a display device, and more particularly, to a display device that receives light from a light source and illuminates a design formed on the surface of a dial.

  2. Description of the Related Art Conventionally, a vehicular instrument (display device) that illuminates a design (scale, number, etc.) of an instrument is known for a vehicular instrument that displays an engine speed, a vehicle speed, and the like. This type of vehicle instrument includes a dial having a design formed on its surface and a light source disposed on the back side of the dial, and emits light emitted from the light source from the design on the dial surface. The design can be illuminated. The power of the light from the light source is strong in the region directly above the light source and weak in the region far from the light source, so that the brightness between the design in the region directly above the light source and the design in the region far from the light source remains as it is. It becomes non-uniform (illumination imbalance).

  Therefore, conventionally, as a technique for balancing the illumination of the design formed on the dial surface (making the brightness uniform), a technique for forming a halftone dot layer (halftone dot printing) with black ink on the back of the dial is proposed. (For example, refer to Patent Document 1). The halftone dot layer is formed in such a manner that the halftone dot (the area ratio between the halftone dot and the portion other than the halftone dot) increases as the distance from the light source becomes closer.

JP 2013-124961 A

  By the way, in recent years, the number of instruments for vehicles in which the color tone (illumination color) of the design changes according to the state of the vehicle is increasing. In a display device that can change to a plurality of color tones, such as a vehicle instrument, a halftone dot layer is formed so that one of the tones is determined as a main light source color and an illumination balance is obtained with the main light source color. It was. For this reason, when illumination is performed with a light source color other than the main light source color, light is emitted from a position different from the light emission position assumed by the halftone dot layer (the light emission position of the main light source color). There is.

  The present invention has been made in view of the above problems, and in a display device in which design illumination is switched to one of a plurality of types of light source colors, it is possible to balance the illumination regardless of the type of light source color. It is an object to provide a display device that can be used.

In order to solve the above problems, the display device of the present invention has a design formed on the surface, a dial that transmits light,
A plurality of types of light sources arranged on the back side of the dial plate and emitting different colors toward the dial plate, such that any one of the plurality of types of light sources emits light when the design is illuminated. Multiple types of light sources to be controlled,
A halftone dot layer formed on the back surface of the dial so as to balance the illumination between the areas of the design at the time of light emission of the light source,
The halftone dot layer has a plurality of individual halftone dot layers formed to overlap with each other in the same number as the type of the light source,
Each of the plurality of individual halftone dot layers is assigned to one of the plurality of types of light sources,
The individual halftone dot layer is formed based on an arrangement position of an assigned light source that is the light source assigned to the individual halftone dot layer, and has a light shielding property with respect to a light emission color of the assigned light source. It is characterized in that it is made of a material having transparency with respect to the emission color of the light source other than the above.

  According to the present invention, a plurality of individual halftone dot layers assigned to one of a plurality of types of light sources are formed, and each individual halftone dot layer is located at a position where a light source (assigned light source) assigned to itself is arranged. Since it is formed on the basis of this and has a light-shielding property with respect to the emission color of the assigned light source, it is possible to balance the illumination of the design when the assigned light source emits light. Further, each individual halftone dot layer is transparent to the emission color of a light source of a type other than the assigned light source, so that the halftone dot can be invalidated for a type of light source other than the assigned light source. In other words, when one of the light sources emits light, one individual halftone dot layer to which that light source is assigned becomes effective, and the other individual halftone dot layer becomes invalid. As well as lighting balance.

It is a front view of the meter for vehicles (meter) in a 1st embodiment. It is sectional drawing of the meter in the II-II line | wire of FIG. It is a front view of the meter for vehicles (meter) in a 2nd embodiment. It is the figure which showed the state of the meter at the time of illumination of the motive power display (1st design) of an electric motor. It is the figure which showed the state of the meter at the time of illumination of an engine speed display (2nd design). It is the A section enlarged view of FIG. It is sectional drawing of the meter in the VII-VII line of FIG.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a vehicle meter (hereinafter referred to as a meter) as a display device of the present embodiment. In addition, in FIG. 1, LED8, 9 mentioned later is seen through and is shown in figure. A meter 1 in FIG. 1 is mounted on a vehicle and displays a measurement value of a sensor that measures the state of the vehicle. In the present embodiment, the meter 1 is a vehicle speed meter that displays the vehicle speed as the state of the vehicle. The meter 1 is disposed, for example, at a position facing the driver's seat in the passenger compartment so that the driver can visually recognize it. First, the configuration of the meter 1 will be described.

  The meter 1 includes a dial plate 2 that is disposed on the front surface of the meter 1 and is formed of a transparent plate (transparent plate) that transmits light such as a polycarbonate plate material. In the present embodiment, the dial 2 has a circular shape when viewed from the front, but may have any shape such as a fan shape or an elliptical shape.

  A design 22 for indicating the measured vehicle speed is formed on the surface 21 of the dial 2. The design 22 is formed in a part of the outer peripheral area of the dial 2 (area surrounded by a dotted line 5 in FIG. 1). The area surrounded by the dotted line 5 is also an area of the halftone dot layer 5 described later. The design 22 includes a number design 221 indicating a vehicle speed value, a scale design 222 formed inside the number design 221, and a unit design 223 indicating a vehicle speed unit (km / h). Yes. In addition, although designs other than the vehicle speed design 22 may be formed on the surface 21, other designs are omitted in FIG.

  FIG. 2 is a cross-sectional view of the meter 1 taken along line II-II in FIG. As shown in FIG. 2, the surface 21 of the dial 2 includes a surface white light-transmitting layer 3 made of transparent white ink and a surface black light-shielding layer 4 made of light-shielding (impermeable) black ink. To the surface white transmissive layer 3 and the surface black light shielding layer 4 are formed in this order. The surface white transmissive layer 3 is a solid layer covering at least the entire region of the region where the design 22 is formed (the region surrounded by the dotted line 5 in FIG. 1). The surface black light shielding layer 4 is a layer extracted in the shape of the design 22. That is, the design 22 is formed by the surface white transmissive layer 3 and the surface black light shielding layer 4.

  The surface white transmissive layer 3 and the surface black light-shielding layer 4 are formed by a method (screen printing) of printing solvent-based ink or UV curable ink using a screen mesh, for example. At this time, first, the surface white light-transmitting layer 3 is printed, and then the surface black light-shielding layer 4 is overcoated (printed over) on the surface white light-transmitting layer 3, thereby forming the design 22 on the surface 21. The

  Note that a smoke layer made of smoke ink with reduced permeability may be formed on the surface white transmissive layer 3 and the surface black light shielding layer 4 (on the design 22). Due to the presence of the smoke layer, it is possible to make the design 22 difficult to see with external light when light from the LEDs 8 and 9 does not come.

  A pointer (not shown) is disposed on the surface 21 of the dial 2. The pointer is arranged such that the base portion is positioned at the center O (see FIG. 1) of the dial 2 and the tip portion faces the design 22. Then, the pointer rotates around the central axis of the dial 2 by a motor (not shown) connected to the base of the pointer, so that the tip of the pointer points to the numerical design 221 and the scale design 222 indicating the measured value of the vehicle speed. To do. That is, the meter 1 is configured as a pointer-type meter.

  As shown in FIG. 2, a substrate 7 is disposed on the back side of the dial 2. On the substrate 7, LEDs 8 and 9, a control unit 10, and the like are mounted. The LEDs 8 and 9 emit different colors of light. Specifically, the LED 8 is a red LED that emits red light, and the LED 9 is a blue LED that emits blue light. Each of these LEDs 8 and 9 is arranged to emit light toward the design 22 in a region immediately below the design 22. Moreover, LED8, 9 is arrange | positioned in several places along the circular arc in the area | region directly under the design 22, as shown in FIG. In the present embodiment, the LEDs 8 and 9 are respectively arranged at three locations along the arc in the region immediately below the arc-shaped design 22 (three locations near the left end, near the center, and near the right end of the region immediately below the design 22). Is arranged. Further, the red LED 8 and the blue LED 9 are arranged in a line in the same space. That is, no light shielding wall is arranged between the red LED 8 and the blue LED 9.

  The control unit 10 is a part that obtains a measured value of the vehicle speed from a vehicle speed sensor (not shown) and controls the driving of the pointer motor so as to instruct the obtained measured value. In addition, the control unit 10 controls the LEDs 8 and 9 so that either the red LED 8 or the blue LED 9 emits light according to the traveling state of the vehicle. Specifically, for example, the control unit 10 determines which of the LEDs 8 and 9 is to be lit depending on the superiority or inferiority of the fuel consumption of the vehicle. The blue LED 9 is caused to emit light during The design 22 is illuminated in red when the red LED 8 emits light, and the design 22 is illuminated in blue when the blue LED 9 emits light.

  As shown in FIG. 2, a halftone dot layer 5 is formed on the back surface 23 of the dial 2 to obtain an illumination balance (luminance uniformity) between the regions of the design 22 when the LEDs 8 and 9 emit light. Yes. The halftone dot layer 5 is formed in a region on the back side of the design 22 (region indicated by a dotted line 5 in FIG. 1). The halftone dot layer 5 includes a first halftone dot layer 51 (individual halftone dot layer) for balancing the illumination when the red LED 8 emits light, and a second halftone dot for balancing the illumination when the blue LED 9 emits light. Layer 52 (individual halftone dot layer). These halftone dot layers 51 and 52 are formed so as to overlap each other. In this embodiment, the first halftone dot layer 51 and the second halftone dot layer 52 are formed in this order from the back surface 23 of the dial 2. . The second halftone dot layer 52 and the first halftone dot layer 51 may be formed in this order.

  The first halftone dot layer 51 and the second halftone dot layer 52 are formed in different modes. Specifically, the first halftone dot layer 51 is formed based on the arrangement position of the blue LED 9 (light emission position of the blue LED 9). Specifically, the first halftone dot layer 51 has halftone dots with different halftone ratios depending on the region so that the luminance is uniform between the region directly above the blue LED 9 and the other regions. Is a layer. More specifically, the first halftone dot layer 51 is formed so that the halftone ratio increases as it approaches the blue LED 9 (assigned light source) that is the light source assigned to the first halftone dot layer 51. Yes. The halftone ratio indicates the ratio of halftone dots in the region of interest. Further, the first halftone dot layer 51 has a light shielding property against blue light (light having a wavelength of 430 to 460 nm), and at least red light other than blue light (light having a wavelength of 610 to 780 nm). ) Is formed of a transparent ink material.

  On the other hand, the second halftone dot layer 52 is formed based on the arrangement position of the red LED 8 (assignment light source) that is the light source assigned to the second halftone dot layer 52 (light emission position of the red LED 8). Specifically, the second halftone dot layer 52 has halftone dots having different halftone ratios depending on the region so that the luminance is uniform between the region directly above the red LED 8 and the other region. Is a layer. More specifically, the second halftone dot layer 52 is formed such that the halftone ratio increases as it approaches the red LED 8. Further, the second halftone dot layer 52 has a light shielding property against red light (light having a wavelength of 610 to 780 nm), and at least blue light other than red (light having a wavelength of 430 to 460 nm). ) Is formed of a transparent ink material.

  An ink material that transmits only a specific wavelength of light is, for example, “Technical Report, Screen Technical Information Vol. 154” in Internet Information (URL: http // www.teikokuink.com / techreport / report / 154_tech.html). (Retrieval date: June 9, 2014) is well known, and the first halftone dot layer 51 and the second halftone dot layer 52 may be formed of such an ink material.

  In order to prevent the halftone dot layers 51 and 52 from being seen through the surface of the dial plate 2, a base layer may be formed between the dial plate 2 and the first halftone dot layer 51. The underlying layer may be a solid coating layer made of transmissive white ink, for example, like the surface white transmissive layer 3.

  The first halftone dot layer 51 and the second halftone dot layer 52 are formed by screen printing, for example. At this time, first, the first halftone dot layer 51 is printed on the back surface 23 of the dial 2. Next, the second halftone dot layer 52 may be printed on the first halftone dot layer 51.

  Next, an operation when the design 22 is illuminated will be described. For example, the control unit 10 causes the red LED 8 to emit light when traveling with good fuel efficiency. At this time, the light L11, L12, L13 (see FIG. 2) emitted from the red LED 8 travels toward the dial plate 2, and a part of the light L11 is a second light-blocking property against red light. Are blocked by the halftone dots of the halftone dot layer 52. In addition, since the first halftone dot layer 51 is transparent to red light, the light L12 and L13 that have passed through the second halftone dot layer 52 pass through the first halftone dot layer 51 as they are. A part L13 of the light L12, L13 that has passed through the first halftone dot layer 51 is blocked by the surface black light-shielding layer 4, and the remaining light L12 is emitted from the part where the design 22 is formed. Is illuminated in red shades. As a result, the driver can grasp that the design 22 is illuminated in red and that the vehicle is traveling with good fuel efficiency. Moreover, the illumination balance between each area | region of the design 22 at the time of red illumination is taken by the 2nd halftone dot layer 52. FIG.

  On the other hand, the control unit 10 causes the blue LED 9 to emit light, for example, when traveling with poor fuel consumption. At this time, since the second halftone dot layer 52 is transmissive to blue light, the light L21, L22, L23 (see FIG. 2) emitted from the blue LED 9 passes through the second halftone dot layer 52. Pass as it is. A part L22 of the lights L21, L22, and L23 that have passed through the second halftone dot layer 52 is blocked by the halftone dots of the first halftone dot layer 51 that shields blue light. A part L23 of the light L21, L23 that has passed through the first halftone dot layer 51 is blocked by the surface black light-shielding layer 4, and the remaining light L21 is emitted from the part where the design 22 is formed. Is illuminated in blue tones. As a result, the driver can grasp that the design 22 is lit in blue and that the vehicle is traveling with poor fuel consumption. Moreover, the illumination balance between each area | region of the design 22 at the time of blue illumination is taken by the 1st halftone dot layer 51. FIG.

  As described above, in the present embodiment, the same design formed on the dial surface can be switched between red color tone and blue color tone. Moreover, even if it illuminates with either red or blue, illumination balance can be taken. Further, by providing a halftone dot layer for each light source type, a light shielding wall can be omitted between the light source types. Thereby, the illumination structure of the meter can be simplified, and the cost can be reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 3 is a front view of a vehicle meter (hereinafter referred to as a meter) as a display device of the present embodiment. In FIG. 3, the LEDs 61 and 62 to be described later are shown through. The meter 100 in FIG. 3 is a meter that is mounted on a hybrid vehicle that travels using both an engine and an electric motor, and can be switched to display either the engine speed or the motive power of the electric motor. The meter 100 is disposed, for example, at a position facing the driver's seat in the passenger compartment so that the driver can visually recognize it. First, the configuration of the meter 100 will be described.

  The meter 100 includes a dial plate 31 that is disposed on the front surface of the meter 100 and is configured of a transparent plate (transparent plate) that transmits light such as a polycarbonate plate material. For example, the dial 31 is formed in a circular shape when viewed from the front. A design 32 is formed on the outer peripheral area of the surface of the dial 31. The design 32 is formed in a form in which both a design in the power display of the electric motor (hereinafter referred to as a first design) and a design in the display of the engine speed (hereinafter referred to as a second design) are combined.

  Here, FIG. 4 is a diagram for explaining the first design 321, and in detail, shows the state of the meter 100 when the first design 321 is illuminated (during display). As shown in FIG. 4, the first design 321 includes a design (hereinafter referred to as an arc design) 321 a formed in an arc shape (substantially C-shaped opening downward). The arc design 321a is composed of a plurality (three in FIG. 3) of arc designs with different diameters centered on the center O of the dial 31. Of the plurality of arc designs 321a, the innermost arc design has a partially hollowed shape, and character designs 321b to 321d are formed in the hollowed portions. Specifically, a character design 321b of “CHARGE” is formed near the left end of the arc design 321a, a character design 321c of “ECO” is formed near the center, and a character design 321d of “POWER” is formed near the right end. Is formed.

  The character design 321b of “CHARGE” indicates that the electric motor is used as a generator for charging the battery when the vehicle is decelerated. A character design 321c of “ECO” indicates that the vehicle is in an eco-drive state. The character design 321d of “POWER” indicates that the power of the electric motor is large. That is, the closer to the right end of the arc design 321a, the greater the power power of the electric motor. These designs 321a to 321d are designated by a pointer 41. The pointer 41 is arranged on the surface of the dial 31 so that the base is located at the center O of the dial 31 and the tip is directed toward the designs 321a to 321d. Then, the pointer rotates around the central axis of the dial 31 by a motor (not shown) connected to the base of the pointer 41, thereby instructing any of the designs 321a to 321d.

  FIG. 5 is a diagram for explaining the second design 322, and more specifically, shows the state of the meter 100 when the second design 322 is illuminated (during display). As shown in FIG. 5, the second design 322 includes a number design 322a indicating the value of the engine speed, a scale design 322b formed inside the number design 322a, and a unit of engine speed (× 1000 r / min). The unit design 322c shown in FIG. The pointer 41 indicates a numerical design 322a and a scale design 322b indicating the current engine speed.

  Note that the first design 321 in FIG. 4 and the second design 322 in FIG. 5 may be formed so as to partially overlap each other, or may be formed so as not to overlap. In the present embodiment, the first design 321 and the second design 322 are formed so as not to overlap. Further, as will be described later, a smoke layer 74 (see FIG. 7) is formed on the surface of the dial 31. When the light from the LEDs 61 and 62 does not come due to the presence of the smoke layer 74, these designs 321 are provided. 322 is difficult to see.

  Here, FIG. 6 shows an enlarged view of part A of FIG. FIG. 7 shows a cross-sectional view of the meter 100 taken along the line VII-VII in FIG. As shown in FIG. 7, on the surface 311 of the dial 31, a first surface layer 71 (an upwardly hatched hatched layer) formed in the shape of the first design 321 is formed. The first surface layer 71 constitutes the first design 321. A portion of the first surface layer 71 other than the portion formed in the shape of the first design 321 is vacant (however, the vacant portion includes other layers (second surface layer 72, surface black light shielding layer 73). ) Filled with.). The first surface layer 71 of FIG. 7 is formed into a part of the arc design 321a (see FIG. 6) and a part of the character design 321b of “CHARGE” (see FIG. 6). The first surface layer 71 is transparent to blue light (light having a wavelength of 430 to 460 nm), and at least red light other than blue (light having a wavelength of 610 to 780 nm). On the other hand, it is formed of an ink material having a light shielding property. This ink material may be formed of the same ink material as that of the second halftone dot layer 52 in the first embodiment.

  Further, on the surface 311 of the dial 31, a second surface layer 72 (a layer with a hatched line rising to the right) formed in the shape of the second design 322 is formed. This second surface layer 72 constitutes the second design 322. In the second surface layer 72, a portion other than the portion formed in the shape of the second design 322 is vacant (however, the vacant portion includes other layers (first surface layer 71, surface black light shielding layer 73). ) Filled with.). The second surface layer 72 of FIG. 7 is formed in the shape of the numeral design 322a (see FIG. 6) of “1” and the shape of the scale design 322b (see FIG. 6) attached to the numeral design 322a. The second surface layer 72 is transparent to red light (light having a wavelength of 610 to 780 nm), and at least blue light other than red (light having a wavelength of 430 to 460 nm). On the other hand, it is formed of an ink material having a light shielding property. This ink material may be formed of the same ink material as the first halftone dot layer 51 in the first embodiment.

  Further, on the surface 311 of the dial plate 31, a surface black light shielding layer 73 (a hatched layer made up of vertical lines and horizontal lines) is formed with a light shielding (impermeable) black ink. The surface black light shielding layer 73 is a layer extracted in the shape of the first design 321 and extracted in the shape of the second design 322. That is, the surface black light-shielding layer 73 is formed so as to fill both the empty portion of the first surface layer 71 constituting the first design 321 and the empty portion of the second surface layer 72 constituting the second design 322. Has been.

  Further, on the surface 311 of the dial 31 (strictly speaking, on the first surface layer 71, the second surface layer 72, and the surface black light shielding layer 73), a smoke layer 74 (upward to the left) made of smoke ink with suppressed transparency. The hatched layer is formed of a slanting line and a slanting line rising to the right.

  These layers 71 to 74 are formed by, for example, screen printing. At this time, the respective layers 71 to 74 are formed by applying the first surface layer 71, the second surface layer 72, the surface black light shielding layer 73, and the smoke layer 74 in this order (overprinting). Note that the first surface layer 71 and the second surface layer 72 may be printed in either order.

  As shown in FIG. 7, a substrate 51 is disposed on the back side of the dial 31. On the substrate 51, LEDs 61 and 62, a control unit 91, and the like are mounted. The LEDs 61 and 62 emit light of different colors. Specifically, the LED 61 is a red LED that emits red light, and the LED 62 is a blue LED that emits blue light. Each of these LEDs 61 and 62 is disposed so as to emit light toward the design 32 in a region immediately below the design 32 (the first design 321 and the second design 322). Further, as shown in FIG. 1, the LEDs 61 and 62 are arranged at a plurality of locations along an arc in the region immediately below the design 32. In the present embodiment, the LEDs 61 and 62 are respectively arranged at six locations at substantially equal intervals along the arc in the region immediately below the arc-shaped design 32. Moreover, as shown in FIG. 7, the red LED 61 and the blue LED 62 are arranged so as to be arranged in the same space. That is, no light shielding wall is disposed between the red LED 61 and the blue LED 62.

  The control unit 91 acquires the engine speed and the state of the electric motor from a sensor (not shown), and drives and controls the motor of the pointer 41 according to the acquired engine speed and the state of the electric motor. In addition, the control unit 91 controls the LEDs 61 and 62 so that one of the red LED 61 and the blue LED 62 emits light based on the position of a display changeover switch (not shown) arranged around the driver's seat. The display changeover switch is a switch operated by the driver that instructs either the power power display of the electric motor or the engine speed display. The control unit 91 causes the blue LED 62 to emit light when the display changeover switch instructs to display the power power of the electric motor. The control unit 91 causes the red LED 61 to emit light when the engine speed display is instructed by the display changeover switch.

  As shown in FIG. 7, a halftone dot layer 81 is formed on the back surface 33 of the dial 31 to obtain illumination balance (luminance uniformity) between the areas of the designs 321 and 322 when the LEDs 61 and 62 emit light. Has been. The halftone dot layer 81 includes a first halftone dot layer 82 (individual halftone dot layer) for balancing illumination when the blue LED 62 emits light, and a second halftone dot for balancing illumination when the red LED 61 emits light. Layer 83 (individual halftone dot layer). These halftone dot layers 82 and 83 are formed so as to overlap each other. In this embodiment, the first halftone dot layer 82 and the second halftone dot layer 83 are formed in this order from the back surface 33 of the dial 31. . However, the second halftone dot layer 83 and the first halftone dot layer 82 may be formed in this order.

  The first halftone dot layer 82 and the second halftone dot layer 83 are formed in different modes. Specifically, the first halftone dot layer 82 is formed based on the arrangement position of the blue LEDs 62 (light emission position of the blue LEDs 62). Specifically, the first halftone dot layer 82 has halftone dots having different halftone ratios depending on the region so that the luminance is uniform between the region immediately above the blue LED 62 and the other region. More specifically, the first halftone dot layer 82 is formed such that the halftone ratio increases as it approaches the blue LED 62 (assigned light source) that is the light source assigned to the first halftone dot layer 82. Yes. Further, the first halftone dot layer 82 has a light shielding property against blue light (light having a wavelength of 430 to 460 nm), and at least red light other than blue light (light having a wavelength of 610 to 780 nm). ) Is formed of a transparent ink material.

  On the other hand, the second halftone dot layer 83 is formed based on the arrangement position of the red LED 61 (assignment light source) that is the light source assigned to the second halftone dot layer 83 (light emission position of the red LED 61). Specifically, the second halftone dot layer 83 has halftone dots having different halftone ratios depending on the region so that the luminance is uniform between the region directly above the red LED 61 and the other region. More specifically, the second halftone dot layer 83 is formed so that the halftone ratio increases as it approaches the red LED 61. Further, the second halftone dot layer 83 has a light shielding property against red light (light having a wavelength of 610 to 780 nm), and at least blue light other than red (light having a wavelength of 430 to 460 nm). ) Is formed of a transparent ink material.

  The first halftone dot layer 82 and the second halftone dot layer 83 are formed by, for example, screen printing. At this time, first, the first halftone dot layer 82 is printed on the back surface 33 of the dial 31. Next, the second halftone dot layer 83 may be printed on the first halftone dot layer 82.

  Next, an operation when the designs 321 and 322 are illuminated will be described. When the blue LED 62 emits light by the control unit 91, the second halftone dot layer 83 is invalid with respect to the light from the blue LED 62, and the first halftone dot layer 82 is valid. That is, the light from the blue LED 62 passes through the second halftone dot layer 83 as it is, and a part of the light is shielded by the first halftone dot layer 82. The light that has passed through the first halftone dot layer 82 is emitted from the first surface layer 71 that is transparent to blue light, and is a layer other than the first surface layer 71 (second surface layer 72, surface black color). It is blocked by the light blocking layer 73). Thus, the first design 321 (see FIG. 4) is illuminated with a blue color tone. Thus, the driver can grasp the power power state of the electric motor. Moreover, the illumination balance between each area | region of the 1st design 321 at the time of blue illumination is taken by the 1st halftone dot layer 82. FIG.

  On the other hand, when the red LED 61 emits light, the first halftone dot layer 82 becomes invalid and the second halftone dot layer 83 becomes effective for the light from the red LED 61. That is, a part of the light from the red LED 61 is shielded by the second halftone dot layer 83 and passes through the first halftone dot layer 82 as it is. The light that has passed through the first halftone dot layer 82 is emitted from the second surface layer 72 that is transparent to red light, and is a layer other than the second surface layer 72 (first surface layer 71, surface black color). It is blocked by the light blocking layer 73). Thus, the second design 322 (see FIG. 5) is illuminated with a red color tone. As a result, the driver can grasp the state of the engine speed. In addition, the second halftone dot layer 83 balances illumination between the regions of the second design 322 during red illumination.

  As described above, the same effect as that of the first embodiment can be obtained even in the configuration in which switching illumination is performed between two different designs as in the present embodiment.

  In addition, this invention is not limited to the said embodiment, A various change is possible to the limit which does not deviate from description of a claim. For example, in the above embodiment, red and blue are exemplified as the types of light source colors, but other light source colors may be adopted. Further, in the first embodiment, an example in which the illumination changes in two color tones of red and blue has been described, but it may be changed to a tone of three or more patterns. In this case, for example, a light source (three or more types of light sources) for each color tone is arranged, and a halftone dot layer (three or more individual halftone dot layers) is formed for each light source. Each halftone dot layer is formed of a material that has a light-shielding property with respect to the emission color of the light source to which it is assigned, and that has a transparency with respect to the emission color of other light sources.

  Moreover, in 2nd Embodiment, although the example which applied this invention to the switching display of the engine speed display and the electric power power display of an electric motor in a hybrid vehicle was demonstrated, other than an engine speed display and the electric power power display of an electric motor were demonstrated. The present invention may be applied to display. In the second embodiment, an example in which two patterns of designs are switched and displayed has been described, but three or more patterns of designs may be switched and displayed in different color tones. In this case, a surface layer (three or more surface layers) formed in the shape of each design is formed on the surface of the dial. Each surface layer is formed of a material having transparency to the emission color of the light source to which the surface layer is assigned and having a light-shielding property to the emission colors of the other light sources. Further, a halftone dot layer is also formed for each light source. Each halftone dot layer is formed of a material that has a light-shielding property with respect to the emission color of the light source to which it is assigned, and that has a transparency with respect to the emission color of other light sources.

1,100 Instrument for vehicle (display device)
2, 31 Dial 22, 32 Design 8, 61 Red LED
9, 62 Blue LED
5, 81 Halftone dot layer 51, 52, 82, 83 Individual halftone dot layer

Claims (3)

A design (22, 32) is formed on the surface (21, 311), and a dial (2, 31) that transmits light;
A plurality of types of light sources arranged on the back side of the dial plate and emitting different colors toward the dial plate, such that any one of the plurality of types of light sources emits light when the design is illuminated. A plurality of types of light sources to be controlled (8, 9, 61, 62);
A halftone dot layer (5, 81) formed on the back surface of the dial so as to balance the illumination between the regions of the design at the time of light emission of the light source,
The halftone dot layer has a plurality of individual halftone dot layers (51, 52, 82, 83) formed to overlap with each other in the same number as the type of the light source,
Each of the plurality of individual halftone dot layers is assigned to one of the plurality of types of light sources,
The individual halftone dot layer is formed based on an arrangement position of an assigned light source that is the light source assigned to the individual halftone dot layer, and has a light shielding property with respect to a light emission color of the assigned light source. A display device (1, 100), characterized in that it is made of a material having transparency to the emission color of the light source other than the above.   The display device according to claim 1, wherein the plurality of types of light sources are arranged in the same space on the back side of the dial.   The display device according to claim 1, wherein the display device is a vehicle instrument.

Images