JPWO2019151111A1 - Display device - Google Patents

Abstract

Provided is a display device capable of suitably blocking the end face of the light guide body. A light source that emits light, a first dial 14 that is provided on the front side of the light source and displays a design by transmitting light, and a guide that is arranged on the back side of the first dial 14 to guide light to the first dial 14. It includes a light body 15 and a light-shielding member 16 that covers an end surface 15c along the front to back direction of the light guide body 15. The light guide body 15 and the light-shielding member 16 are integrally molded products in which the light-shielding member 16 is in close contact with the end face 15c. A first dial 14 and a second dial 13 provided on the back side of the light guide 15 are further provided, and the second dial 13 is located in a region of the second dial 13 facing the light guide 15. It has a reflective layer 23 having a higher reflectance than the region.

Description

The present invention relates to a display device mounted on a vehicle or the like.

Vehicles such as automobiles are equipped with display devices such as speedometers and engine speedometers that display information necessary for driving. Such a display device has a dial having a design such as a scale, numbers, letters, and symbols formed in the shape of a blank character. The dial transmits the light of a light source provided on the back side to display a design or illuminate it to make it stand out.

The display device has a required light-shielding structure on the dial and its peripheral members so that light does not leak from areas other than the design.

Japanese Unexamined Patent Publication No. 2014-25865

When the design is provided near the end face, which is a surface along the thickness direction of the dial, it is necessary to guide the light of the light source directly or by using a light guide or the like to the vicinity of the end face. In this case, it is necessary to cover the end face of the light guide with a light-shielding member so that the light diffused inside the light guide does not leak from the end face. However, due to the design of the display device, it may be difficult to secure a space for arranging the light-shielding member, and a light-shielding member having a high degree of freedom in design has been required.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a display device capable of suitably shading the end face of a light guide body.

In order to solve the above-mentioned problems, the display device according to the present invention includes a light source that emits light, a first dial that is provided on the front side of the light source and displays a design by transmitting the light, and the first dial. The light guide body is provided with a light guide body arranged on the back surface side of the single dial and guiding the light to the first dial, and a light-shielding member covering an end surface along the direction from the front surface to the back surface of the light guide body. The light-shielding member is an integrally molded product in which the light-shielding member is in close contact with the end face.

In the display device according to the present invention, the end face of the light guide body can be suitably shielded from light.

The front view which shows the display device which is the embodiment of the display device which concerns on this invention. Sectional drawing along line II-II of FIG. Sectional drawing along line III-III of FIG. Explanatory drawing which shows the positional relationship between a display panel and a light guide body. The perspective view of the light guide body and the light shielding member. An enlarged view for explaining the display screen dial, the speedometer dial, and the light guide body of FIG.

An embodiment of the display device according to the present invention will be described with reference to the accompanying drawings. The display device according to the present invention is mounted on, for example, vehicles such as automobiles and motorcycles, ships, agricultural machines, and construction machines. In the present embodiment, an example will be described in which the display device according to the present invention is a display device for an automobile having a speedometer and a display screen.

FIG. 1 is a front view showing a display device 1 which is an embodiment of the display device according to the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG.

FIG. 4 is an explanatory diagram showing the positional relationship between the display panel 12 and the light guide body 15.

FIG. 5 is a perspective view of the light guide body 15 and the light shielding member 16.

FIG. 6 is an enlarged view illustrating the display screen dial 13, the speedometer dial 14, and the light guide 15 of FIG.

In the following description, the "front side" means the front side in FIG. 1, the upper side in FIGS. 2 and 3, and the side visually recognized by the viewer (driver). "Back side" means the back side in FIG. 1, the lower side in FIGS. 2 and 3.

The display device 1 has a speedometer 2 and a display screen 3. The speedometer 2 is a pointer type (mechanical) meter that displays the speed of the vehicle. The display screen 3 is, for example, a liquid crystal display screen, and displays various information such as a mileage, a remaining amount of gasoline, and navigation information. The speedometer 2 points to a speedometer dial 14 provided on the front side of the display screen 3. Further, a part of the speedometer 2 is arranged so as to be superimposed on the front side of the display screen 3.

The display device 1 includes a pointer 11, a display panel 12, a display screen dial 13, a speedometer dial 14, a light guide 15, a light-shielding member 16, a circuit board 17, a case 18, and the like. Mainly has.

The pointer 11 is connected to a pointer shaft of a pointer drive unit provided on the circuit board 17, and rotates on a surface parallel to the surface of the speedometer dial 14. The pointer 11 points to a scale (design 35) formed on the speedometer dial 14 corresponding to the speed of the vehicle.

The display panel 12 is provided on the back side of the display screen dial 13 and displays information. The display panel 12 has a pair of surface glass substrates that enclose the liquid crystal layer. A transparent electrode is formed on the pair of glass substrates by ITO (Indium Tin Oxide) or the like. Further, the display panel 12 has a pair of surface polarizing plates (polarizing filters) arranged so as to sandwich the pair of surface glass substrates. The display panel 12 is connected to the circuit board 17 via a flexible substrate such as FPC (Flexible Printed Circuits). The display panel 12 applies a drive voltage to the liquid crystal layer via the transparent electrode by being controlled by the control unit of the circuit board 17. As a result, the orientation of the liquid crystal molecules in the liquid crystal layer is controlled, and the individual pixels of the display panel 12 are switched to the transmissive state or the opaque state. With such a combination of pixels, the display panel 12 displays predetermined information on the display screen 3.

A backlight unit is provided on the back side of the display panel 12. The backlight unit includes a light source such as an LED (Light Emitting Diode) and a light guide body, and illuminates the display panel 12 from the back surface. The display panel 12 is housed in the display panel case 12a (FIG. 4) together with the backlight.

The display screen dial 13 (dial 13) is a second dial, and is a thin plate-shaped member provided on the front side of the display panel 12 and the back side of the light guide body 15.

The display screen dial 13 has an opening 31 and a design 32. The opening 31 partitions the display panel 12 and exposes the display screen 3. That is, the display screen dial 13 exposes the area of the display panel 12 that becomes the display screen 3, and hides a part of the peripheral side of the display area and the display panel case 12a. The opening 31 may be a transparent layer provided on the base material 21.

The design 32 is, for example, a symbol indicating the state of the vehicle. The design 32 is lit and displayed by transmitting the light of the light source emitted from the back side of the dial 13 for the display screen.

As shown in FIG. 6, the display screen dial 13 has a base material 21, a light-shielding layer 22, and a reflective layer 23.

The base material 21 is, for example, a transparent polycarbonate resin, and is a plate-like member having transparency (translucency).

The light-shielding layer 22 is a printing layer printed with black light-shielding ink formed on the front side (or back side) of the base material 21. The light-shielding layer 22 is provided at least in a visible area on the display screen dial 13, that is, in an area where the surface of the display screen dial 13 is not covered with other members. The light-shielding layer 22 has a blank character portion corresponding to the shape of the design 32.

The reflective layer 23 is a region of the display screen dial 13 facing the light guide body 15, and is provided on the front side (or back side) of the base material 21. That is, the reflective layer 23 is a region located on the back surface side of the speedometer dial 14, and is a region that is not visible to the viewer. The reflective layer 23 is provided to reflect the light in the light guide body 15 and diffuse it in the light guide body 15. The reflective layer 23 is, for example, a layer printed with white ink having a high reflectance, and has a higher reflectance than the base material 21 and the light-shielding layer 22 of the dial 13 for a display screen.

The speedometer dial 14 (dial 14) is the first dial, and is a thin plate-shaped member provided on the front side of the light source 17a and the back side of the pointer 11 as shown in FIG. The speedometer dial 14 has an arc shape having a constant width. In the speedometer dial 14, one end portion 14a in the circumferential direction (length direction) is superimposed on the display screen 3. The speedometer dial 14 has a design 35 that is illuminated and displayed by transmitting the light of the light source 17a. The design 35 is a scale indicated by numbers, letters and pointer 11. A decorative ring 36 is arranged on the outer peripheral edge 14b of the speedometer dial 14. The decorative ring 36 decorates the outer peripheral edge 14b of the speedometer 2 and at the same time covers the gap between the speedometer dial 14 and the light-shielding wall 41b of the inner case 41 (FIG. 2). The decorative ring 36 is not arranged at one end 14a and the inner peripheral edge 14c of the speedometer dial 14. That is, one end 14a and the inner peripheral edge 14c are exposed and are not covered with other members such as the decorative ring 36.

The light guide body 15 is arranged on the back side of the speedometer dial 14, and guides the light of the light source 17a to the speedometer dial 14. In addition, in FIG. 4 and FIG. 5, the light guide body 15 is shown by an oblique line.

The light-shielding member 16 covers the end faces 15a and 15c along the thickness direction (direction from the front surface to the back surface) of the light guide body 15. The light guide body 15 and the light-shielding member 16 are integrally molded products in which the light-shielding member 16 is in close contact with the end faces 15a and 15c. The light guide body 15 and the light shielding member 16 are formed by two-color molding or insert molding.

Details of the speedometer dial 14, the light guide body 15, and the light-shielding member 16 will be described later.

The circuit board 17 mainly includes a driver and a control unit for the display panel 12 and the light source 17a, a light source 17a, and a pointer driving unit.

The control unit has a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and executes a predetermined arithmetic process according to a program written in the ROM, for example. For example, the control unit acquires vehicle speed, various vehicle information, and the like from the vehicle's ECU (Electronic Control Unit) via various sensors and the like. The control unit drives and controls the speedometer 2 and the display screen 3 based on the acquired information.

The light source 17a is an LED (Light Emitting Diode) and illuminates the speedometer dial 14. In addition to the light source 17a, the circuit board 17 also has a light source for the design 32 of the display screen dial 13.

The case 18 has a middle case 41, a lower case 42, and an upper case 43.

The inner case 41 is made of a synthetic resin such as white, and fixes or supports the display panel 12, the dial 13 for the display screen, the dial 14 (dial 13, 14) for the speedometer, and the circuit board 17. ..

As shown in FIG. 3, the middle case 41 has a light-shielding wall 41a that surrounds the light source 17a for the speedometer dial 14 and guides light. The light-shielding wall 41a is a wall that divides the illumination (emission) region of the light source 17a to form a tubular space, and light passes through this tubular space. One end of the light-shielding wall 41a (the surface of the light-shielding wall 41a facing the circuit board 17) is in contact with the circuit board 17, and the other end (the surface of the light-shielding wall 41a facing the speedometer dial 14) is the light guide body 15. And is in contact with the back surface of the light shielding member 16.

Further, as shown in FIG. 2, the middle case 41 has a light-shielding wall 41b that blocks light from the end surface 15b on the outer peripheral side of the light guide body 15. The light-shielding wall 41b protrudes from the opening of the display screen dial 13 toward the front side, and rises substantially perpendicular to the dial 13. The light-shielding wall 41b also has a function of reflecting light traveling in the light guide body 15.

The upper case 43 and the lower case 42 are made of, for example, black synthetic resin or the like, and form an internal space formed by being fitted, and the pointer 11, the display panel 12, and the display screen dial 13 are formed in this internal space. , A speedometer dial 14, and a circuit board 17 are housed.

Next, the details of the speedometer dial 14, the light guide body 15, and the light-shielding member 16 will be described.

The speedometer dial 14, the light guide 15, and the light-shielding member 16 are components of the speedometer 2. The light guide body 15 and the light-shielding member 16 which are integrally molded products are arranged so as to face the front surface of the display screen dial 13. That is, the display screen dial 13 faces the light guide body 15 and is provided on the back side of the light guide body 15. In the light guide body 15 and the light shielding member 16, a plurality of hooks protruding from the back side of the light guide body 15 and the light shielding member 16 toward the middle case 41 penetrate the display screen dial 13 and engage with the middle case 41. It is positioned by matching. The speedometer dial 14 is arranged on the front surface of the light guide body 15 and the light-shielding member 16 and on the tip surface 41c of the light-shielding wall 41b (FIG. 2). The dial 14 is positioned by the shielding wall 16b of the light shielding member 16. The dial 14 is fixed to the light guide 15 via, for example, an adhesive layer printed on the back surface of the dial 14, and then fixed by a decorative ring 36. Although the dial 14 faces the shielding wall 16b, a certain gap is provided in the design. As a result, one end 14a and the inner peripheral edge 14c of the dial 14 are exposed without being covered by other members.

As shown in FIG. 6, the speedometer dial 14 has a base material 51, a colored layer 52, and a light-shielding layer 53. Further, the base material 51 has a damping layer 54. The coloring layer 52, the light-shielding layer 53, and the damping layer 54 are laminated on the base material 51. Specifically, on the front surface side of the base material 51, the attenuation layer 54, the coloring layer 52, and the light-shielding layer 53 are laminated in this order from the base material 51 side. The light-shielding layer 53 is provided on the attenuation layer 54 in the region where the colored layer 52 is not provided. Further, the back surface side of the base material 51 has an attenuation layer 54, a coloring layer 52, and a light-shielding layer 53 in this order from the base material 51 side.

The base material 51 is, for example, a transparent polycarbonate resin, and is a plate-like member having transparency (translucency).

The attenuation layer 54 is a layer provided on the front surface and the back surface of the base material 51 to attenuate the transmitted light or the reflected light. The attenuation layer 54 is, for example, a smoke printing layer printed with a smoke-colored ink, has a transmittance smaller than that of the base material 51, and has a brightness smaller than that of the colored layer 52.

The colored layer 52 is a layer provided at least in the area where the design 35 is provided. The colored layer 52 is a layer having an arbitrary color, for example, printed with white ink. The colored layer 52 acts as the color of the design 35 when it is not illuminated by the light of the light source 17a. Further, the colored layer 52 has a function as a filter regarding the color of the light of the light source 17a in a state of being illuminated by the light of the light source 17a. The colored layer 52 on the front surface side is provided only in the region where the design 35 is formed. On the other hand, the colored layer 52 on the back surface side is provided over the entire surface of the dial 14. The coloring layer 52 on the front surface side mainly has a function of displaying the color of the light transmitted through the dial 14 in a desired color. The colored layer 52 on the back surface side has a function of making the color of the light transmitted through the colored layer 52 on the front surface side clearer and a function of reflecting the light in the base material 51 and diffusing it over a wide range. There is.

The light-shielding layer 53 is, for example, a layer printed with black light-shielding ink and provided to block the light of the light source 17a. The light-shielding layer 53 has a blank character portion corresponding to the shape of the design 35. That is, the light-shielding layer 53 blocks light in a region other than the region of the design 35. The light-shielding layer 53 on the front surface side is provided on the front surface side of the damping layer 54 (base material 51), but the region where the colored layer 52 is provided is provided so as to cover the peripheral edge of the colored layer 52. There is.

The light guide 15 is made of, for example, a transparent acrylic resin (PMMA). The light guide body 15 has a light receiving unit 61 and a light guide unit 62 (FIG. 3). The light receiving unit 61 faces the light emitting surface of the light source 17a, receives the light of the light source 17a, and guides the light from the back surface of the display device 1 toward the front surface (direction from the light source 17a to the dial 14). The light guide unit 62 is a plate-shaped member that is vertically bent and extended from the light receiving unit 61, and has an arc shape having a constant width. The light guide portion 62 may be provided at least on the back surface side of the design 35 of the dial 14, and in the present embodiment, it has substantially the same outer shape as the dial 14.

The light-shielding member 16 is made of, for example, black ABS resin and has a light-shielding property. The light-shielding member 16 covers the end faces 15a and 15c of the end faces of the light guide body 15 in order to prevent light leakage from the end faces 15a and 15c that are exposed without being shielded by the decorative ring 36 and the light-shielding wall 41b. Specifically, as shown in FIG. 5, the light-shielding member 16 is an end face of the light guide body 15 in the circumferential direction (length direction), and is included in the end face 15a and the light guide body 15 superposed on the display screen 3. It covers the end face 15c along the periphery (in the width direction).

From the viewpoint of thinning the light guide body 15, it is preferable that the light shielding member 16 is provided only on the end faces 15a and 15c of the light guide body 15 and not on the back surface side of the light guide body 15. As a result, the light guide body 15 can be made thin, and the display screen 3 and the speedometer 2 can be brought closer to each other in the thickness direction. Further, in order to reflect the light in the light guide body 15 by the light shielding wall 41b of the inner case 41, the end surface 15b along the outer peripheral edge facing the light shielding wall 41b among the end faces of the light guide body 15 is formed. It is preferable that the light-shielding member 16 is not provided.

As shown in FIG. 6, the light-shielding member 16 has a shielding wall 16b protruding from the outer peripheral edge of the top 16a. The shielding wall 16b faces the end surface 14d along the thickness direction (from the front surface to the back surface) of the dial 14. The shielding wall 16b is higher than the height of the dial 14 in the thickness direction when the dial 14 is arranged on the light guide body 15 and the light shielding member 16. The shielding wall 16b covers the end surface 14d of the dial 14 in the thickness direction to prevent light leakage from the base material 51 of the dial 14 from a slight gap between the dial 14 and the shielding wall 16b. It prevents the end face 14d from being visually recognized by the viewer. Further, it is possible to prevent the light leaking from the dial 14 from unintentionally illuminating the top surface 16c of the shielding wall 16b.

In the present embodiment, due to the appearance design of the display device 1, a part of the speedometer 2 (speedometer dial 14 and light guide 15) is superposed on the front side of the display screen 3 to arrange the speed. The display on the total 2 and the display on the display screen 3 are made continuous. In this case, when the end surface of the light guide body 15 that overlaps with the display screen 3 is covered with the decorative ring 36, the decorative ring 36 emphasizes the boundary between the speedometer 2 and the display screen 3, and the display and the display screen on the speedometer 2 are displayed. 3 The continuity with the above display is impaired.

On the other hand, in the display device 1 of the present embodiment, since the light-shielding member 16 is provided as an integrally molded product with the light guide body 15, light-shielding can be suitably performed without impairing the appearance of the display device 1. That is, since the light-shielding member 16 is an integrally molded product with the light-shielding body 15, a structure for attaching the light-shielding member 16 to the light-shielding body 15 is unnecessary. Therefore, as compared with the case where the light-shielding member 16 and the light guide body 15 are separate members, they can be arranged in close contact with each other without any gaps. Moreover, the light-shielding member 16 can be made thin. As a result, the end faces 15a and 15c of the light guide body 15 can be brought closer to the end faces (one end portion 14a, inner peripheral edge 14c) side of the dial 14. By arranging the light guide body 15 in this way, the position of the design 35 on the dial 14 can be arranged close to the end surface of the dial 14.

Further, due to the appearance design of the display device 1 described above, when the speedometer 2 is arranged so as to be superimposed on the display screen 3, the display on the speedometer 2 and the display on the display screen 3 can be brought close to each other. The appearance of the display device 1 can be improved.

Further, by providing the light-shielding member 16, it is possible to prevent the light in the light guide body 15 from leaking to the display screen 3 side. As a result, even when the speedometer 2 is superimposed on the display screen 3 and is close to the display screen 3, the visibility of the display screen is not reduced.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

The attenuation layer 54 may be omitted, and the base material itself made of a light-attenuating material such as a smoke material may function as the attenuation layer. Compared with the case where the base material 51 is provided with the separate damping layer 54, even when the end face of the base material is visually recognized, the effect that the base material is inconspicuous is obtained as compared with the case where the base material is transparent.

Although the example in which the dial 13 for the display screen has the reflective layer 23 has been described, the reflective layer may be omitted and the base material 51 may face the light guide body 15. In this case, the light guide body 15 faces the white middle case 41 via the base material 51, and the middle case 41 functions as a light reflecting layer in the light guide body 15. As a result, the light guide efficiency can be improved, and at the same time, the printing process of the reflective layer 23 of the display screen dial 13 can be reduced.

From the viewpoint of light reflection in the light guide body 15, the light shielding layer 53 on the back side of the speedometer dial 14 may be omitted, and the colored layer 52 on the back side may face the light guide body 15.

The coloring layer 52 on the front side and the back side, the light shielding layer 53 on the front side and the back side, and the damping layer 54 on the front side and the back side may be provided on only one of the surfaces, if necessary. Good.

The display panel 12 may be a segment type liquid crystal display panel, an organic EL (Electro-Luminescence) panel, a matrix type liquid crystal display panel such as a TFT (Thin Film Transistor), or an organic EL panel.

1 Display device 2 Speedometer 3 Display screen 11 Pointer 12 Display panel 12a Display panel case 13 Display screen dial 14 Speedometer dial 15 Light guide 16 Light-shielding member 16b Shielding wall 17 Circuit board 17a Light source 18 Case 21, 51 Base material 22, 53 Light-shielding layer 23 Reflective layer 31 Opening 32, 35 Design 36 Decorative ring 41 Middle case 41a, 41b Light-shielding wall 42 Lower case 43 Upper case 52 Colored layer 54 Attenuating layer 61 Light receiving part 62 Light receiving part

Claims (4)

A light source that emits light and
A first dial provided on the front side of the light source and displaying a design by transmitting the light,
A light guide that is arranged on the back side of the first dial and guides the light to the first dial.
A light-shielding member that covers an end face along the direction from the front surface to the back surface of the light guide body is provided.
The light guide body and the light-shielding member are display devices in which the light-shielding member is an integrally molded product in close contact with the end face. Further provided with the first dial and the second dial provided on the back side of the light guide.
The display device according to claim 1, wherein the second dial has a reflective layer having a higher reflectance than other regions in a region of the second dial facing the light guide body. A display panel provided on the back side of the second dial and displaying information is further provided.
The second dial has an opening that exposes the display panel and partitions the display screen.
The first dial and a part of the light guide body are arranged so as to be superimposed on the front side of the display screen.
The display device according to claim 2, wherein the light-shielding member at least covers the end face of the light guide body superimposed on the display screen. The light-shielding member has a shielding wall that protrudes from the outer peripheral edge of the light-shielding member, faces an end surface along the front-back direction of the first dial, and covers the end surface of the first dial in the thickness direction. Item 1. The display device according to item 1.

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