JP2021148555A - Display device - Google Patents

Abstract

To provide a display device capable of suppressing the occurrence of emission luminance unevenness of a transmission part.SOLUTION: The display device includes a front panel 1 which has a transmission part 11, a light guide member 2 which is located on the back side of the front panel 1 and illuminates the transmission part 11 from the back side, and a plurality of light sources 3 which are located on the back side of the light guide member 2, emit light, and are arranged in a row. The light guide member 2 includes a light receiving part 21 which faces the light sources 3 and receives the light from the light sources 3 and an emission part 22 which faces the front panel 1 and emits the light from the light receiving part 21 to the front panel 1. The emission part 22 has a plurality of convex three-dimensional curved surfaces 23 which are formed so as to face the plurality of light sources 3 respectively.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a display device, particularly to a display device mounted on a vehicle or the like provided with a light guide member for equalizing the brightness of a light source that illuminates a design portion.

As a conventional display device, for example, there is one disclosed in Patent Document 1. The display device described in Patent Document 1 includes a substrate having a plurality of light sources, a case having a partition wall for partitioning and surrounding each light source, and a display board arranged on the front surface of the case and having a transmitting portion through which the light of the light source is transmitted. And a light guide body that guides the light of the light source to the transmitting portion by a light guide portion arranged between the case and the display board and provided for each section, and the light emitted from the light guide portion is used as the transmitting portion. Form a segment (partitioned design).

Republished WO 2019/176439

However, in the display device described in Patent Document 1, since the surface of the light guide unit on the display plate side is formed as a flat surface so as to face the display plate, the light emitted from the light guide unit to the display plate varies. There is a problem that uneven emission brightness occurs in the segment visually recognized from the transmission portion due to light emitted in the desired direction but not emitted in the viewing direction of the viewer.

The present disclosure has been made in view of this problem, and an object of the present disclosure is to provide a display device capable of suppressing the occurrence of uneven emission brightness in a transmitting portion.

The present invention is located behind a front panel 1 having a transmissive portion 11, a light guide member 2 located behind the front panel 1 and illuminating the transmissive portion 11 from behind, and a light guide member 2 behind the light guide member 2. A display device 400 including a plurality of light sources 3 arranged in a row that emits light, wherein the light guide member 2 is a light receiving unit that faces the light source 3 and receives light from the light source 3. 21 and an emitting unit 22 that faces the front panel 1 and emits light from the light receiving unit 21 to the front panel 1, and the emitting unit 22 faces each of the plurality of light sources 3. It is characterized by having a plurality of convex three-dimensional curved surfaces 23 formed so as to perform the above.

The front view of the display device which shows the 1st Embodiment of this disclosure. FIG. 5 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG. Emission image of the transmissive portion of the present disclosure. A light emitting image of a transmissive portion showing a second embodiment of the present disclosure.

Hereinafter, embodiments will be described with reference to FIGS. 1 to 5 by exemplifying a case where the display device of the present disclosure is applied to, for example, an instrument for a vehicle mounted on an instrument panel facing the driver's seat of the vehicle. .. The present disclosure can be applied to, for example, automobiles, motorcycles, and vehicles such as agricultural machinery and construction machinery.

In FIG. 1, as an instrument, a vehicle speed meter 100 and an engine speed meter 200 are arranged side by side on the left side of the vehicle speed meter 100, and a liquid crystal display panel 300 for displaying various vehicle information is arranged between them to display a liquid crystal display. The display device 400 is arranged on the upper side of the panel 300.

The direction in which the user sitting in the driver's seat of the vehicle is viewed from the instrument is the front-back (Fr., Re.) Direction in the figure, and the vehicle speed meter 100 is the "right", and the vehicle speed meter 100 and the engine speed. The direction in which the total 200 is lined up is the left-right (L, R in the figure) direction, the display device 400 is "upper", and the direction in which the liquid crystal display panel 300 and the display device 400 are lined up is up and down (To., In the figure). Bo.) direction.

(First Embodiment)
The display device 400 is formed in a rectangular shape with the left-right direction as the longitudinal direction and the vertical direction as the lateral direction, and is displayed by emitting light.

The display device 400 emits the front panel 1 having the transmissive portion 11, the light guide member 2 located behind the front panel 1 and illuminating the transmissive portion 11 from behind, and the light located behind the light guide member 2. A plurality of light sources 3 arranged in a row, a circuit board 4 on which the light sources 3 are mounted, and a light source 3 and a light guide member 2 are housed between the front panel 1 and the circuit board 4. It is provided with at least a case body 5 to be used.

The front panel 1 has a thin plate-shaped translucent substrate 12 made of translucent polycarbonate or the like, a black layer 13 on which a light-shielding black ink is printed and formed on the rear surface of the translucent substrate 12, and translucent. A smoke layer 14 on which a semitransparent smoke-colored ink is printed and formed on the rear surface of the substrate 12 is provided. The transmission portion 11 is formed by not printing the black ink of the black layer 13 on the band shape. The smoke layer 14 is formed in a band shape at a position facing the transmission portion 11. The front panel 1 is arranged on the case body 5.

The circuit board 4 is made of a hard wiring board having a predetermined wiring pattern, and controls the rotation of the pointer 6 of each of the vehicle speed meter 100 and the engine speed meter 200, the display control of the liquid crystal display panel 300, and the like. A control means (not shown) including a microcomputer that controls light emission of the light source 3 and various circuit components (not shown) such as resistors and capacitors are electrically connected to the wiring pattern.

The light source 3 is composed of an LED (chip type light emitting diode: Light Emitting Diode), and a plurality of the light sources 3 are mounted on the circuit board 4 to emit light to the light guide member 2. Three of the first light source 31, the second light source 32, and the third light source 33 are arranged at equal intervals along the longitudinal direction of the transmission portion 11.

The light source 3 has a plurality of first light sources 31, a plurality of second light sources 32, and a plurality of third light sources 33. In the first light source 31, each light source emits monochromatic green light. The second light source 32 is capable of changing the emission color. For example, each light source is composed of a three-color LED in which three primary colors of RGB (red, green, and blue) are packaged, and the three primary colors of the second light source 32. Depending on the combination, light of a color different from that of the first light source 31 and the third light source 33 can be emitted. In the present embodiment, in the second light source 32, each light source emits yellow light. In the third light source 33, each light source emits monochromatic red light.

The light guide member 2 is formed in a substantially rectangular parallelepiped shape by a translucent synthetic resin material, and its front view shape is a band shape facing the shape of the transmission portion 11. The light guide member 2 has a light receiving unit 21 facing the light source 3 and receiving light from the light source 3, and an emitting unit 22 facing the front panel 1 and emitting light from the light receiving unit 21 to the front panel 1. .. The emitting unit 22 has a plurality of convex three-dimensional curved surfaces 23 formed so as to face each of the plurality of light sources 3.

The light receiving portion 21 has a groove portion 24 formed at a position corresponding to each of the light sources 3. The groove portion 24 is formed in a substantially triangular shape with the circuit board 4 side open. The groove 24 is formed between the first groove 241 formed between the first light sources 31, the second groove 242 formed between the second light sources 32, and the third light source 33. Groove 243, a fourth groove 244 formed between the first light source 31 and the second light source 32, and a fifth groove formed between the second light source 32 and the third light source 33. 245 and. The fourth groove portion 244 is formed deeper than the first groove portion 241 and the second groove portion 242 (the height when the height of the light receiving portion 21 is set to the base position is deep). The fifth groove 245 is formed deeper than the second groove 242 and the third groove 243.

With this formation, the fourth groove portion 244 can reduce the color mixing of the first light source 31 and the second light source 32 in the transmission portion 11. Similarly, the fifth groove portion 245 can reduce the color mixing of the second light source 32 and the third light source 33 in the transmission portion 11.

The case body 5 is formed of, for example, a white synthetic resin material, is arranged between the front panel 1 and the circuit board 4, and holds the front panel 1 and the light guide member 2. The case body 5 has an outer shape of the light guide member 2 in the vertical and horizontal directions and a space portion 51 surrounding the plurality of light sources 3 so as to surround the light source member 2.

The display device 400 displays the light source 3 as a shift-up indicator in which the light source 3 is sequentially turned on and the viewer operates the shift pedal. The number of lights of the light source 3 increases every 750 rpm of the engine speed. As shown in FIG. 4A, when the engine speed is 1500 RPM, two first light sources 31 are lit. As shown in FIG. 4B, when the engine speed is 3750 RPM, three first light sources 31 are lit and two second light sources 32 are lit. As shown in FIG. 4C, when the engine speed is 6750 RPM, three first light sources 31, three second light sources 32, and three third light sources 33 are lit.

By being formed in this way, the display color of the display device 400 changes from green to yellow, and from yellow to red, so that the viewer can intuitively rotate the engine speed at a high speed due to the color change. Can be recognized.

As shown in FIG. 2, in the left-right direction, the first illumination light L1 having a relatively strong light intensity on the optical axis emitted from the light source 3 (second light source 32) is the light guide member 2 from the light receiving unit 21. It is incident on the light source 22 and is emitted from the light emitting unit 22 through the front panel 1 and is emitted in the viewing direction of the viewer. Further, the second and third illumination lights L2 and 3, which are emitted in a region deviated from the optical axis and have a relatively weak light intensity, are refracted when emitted from the emitting portion 22 and are transmitted through the front panel 1 in the viewing direction of the viewer. It is emitted.

Similarly, as shown in FIG. 3, in the vertical direction, the first illumination light L1 having a relatively strong light intensity on the optical axis emitted from the light source 3 (second light source 32) is surfaced from the light receiving unit 21. It is incident on the light guide member 2 directly (incident angle 0 degrees), is emitted straight from the exit portion 22 (three-dimensional curved surface 23), is transmitted through the front panel 1, and is emitted in the viewing direction of the viewer. Further, the fourth and fifth illumination lights L4 and 5, which are emitted to a region off the optical axis and have a relatively weak light intensity, are refracted by the light receiving portion 21 and incident on the light guide member 2, and the first illumination light L1. It is refracted to the side and emitted from the emitting unit 22, and is transmitted through the front panel 1 and emitted in the viewing direction of the viewer.

By being formed in this way, the light emitted from the light source 3 is emitted in the viewing direction of the viewer in the vertical and horizontal directions. Therefore, as shown in FIG. 4, a three-dimensional shape formed in a rectangular shape in the front view. The curved surface 23 can be uniformly issued when viewed from the front, and the occurrence of uneven emission brightness can be suppressed.

(Second embodiment)
A second embodiment of the display device according to the present disclosure will be described with reference to FIG. The same parts and equal parts as those in the first embodiment described above will be described with the same reference numerals.

In the first embodiment, each light source of the second light source 32 emits orange light, but in the present embodiment, the second light source 32 is a second light source 311 close to the first light source 31. Lights yellow-green, then the second light source 312 close to the first light source 31 emits yellow, and the second light source 313 farthest from the first light source 31 emits orange. That is, the color of the second light source 32, which is closer to the first light source 31, emits a color closer to the color of the first light source 31 than the color of the other second light source 32.

By being formed in this way, the display color of the display device 400 gradually changes from green to red, so that the viewer can recognize the natural color change.

The present disclosure is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present disclosure without departing from the present disclosure.

1 Front panel 11 Transmissive part 12 Translucent substrate 13 Black layer 14 Smoke layer 2 Light source member 21 Light source part 22 Light source part 23 Three-dimensional curved surface 24 Groove part 241 First groove part 242 Second groove part 243 Third groove part 244 4 groove 245 5th groove 3 light source 31 1st light source 32 2nd light source 321 2nd light source 322 2nd light source 323 2nd light source 33 3rd light source 4 Circuit board 5 Case body 51 Space part 6 Pointer 100 Vehicle speed meter 200 Engine rotation meter 300 Liquid crystal display panel 400 Display device L1 First illumination light L2 Second illumination light L3 Third illumination light L4 Fourth illumination light L5 Fifth illumination light

Claims (4)

A front panel with a transparent part and
A light guide member located behind the front panel and illuminating the transmissive portion from behind,
A display device including a plurality of light sources arranged in a row that emits light located behind the light guide member.
The light guide member includes a light receiving portion that faces the light source and receives light from the light source, and an exit portion that faces the front panel and emits light from the light receiving portion to the front panel.
The display device is characterized in that the emitting unit has a plurality of convex three-dimensional curved surfaces formed so as to face each of the plurality of the light sources. The light source includes a plurality of first light sources and a plurality of second light sources that emit light having a color different from that of the first light source.
The light receiving portion has a groove portion formed at a position corresponding to the space between the light sources.
The groove is formed between a first groove formed between the first light sources, a second groove formed between the second light sources, and between the first light source and the second light source. With a third groove to be formed,
The display device according to claim 1, wherein the third groove is formed deeper than the first groove and the second groove. The first light source is such that each of the light sources emits monochromatic light.
The display device according to claim 2, wherein the second light source is one in which each light source can emit light of a plurality of colors. The display device according to claim 3, wherein the color of the second light source close to the first light source is closer to the color of the first light source than the color of the other second light source.

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