JP7269534B2 - Display device - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a display device having a display panel used, for example, in a vehicle instrumentation device.

As disclosed in Patent Document 1, a conventional display device has a light shielding layer printed on the front surface of a base material that is a base material, and an overcoat layer with a rough surface having fine unevenness on the front surface is printed on the front surface. It has a sign plate formed.

Further, in a conventional display device, as disclosed in Patent Document 2, a case (holder) for accommodating a light guide member (lens sheet) is arranged in front of a display plate (dial plate).

JP-A-2003-139580 JP 2011-59136 A

In such a display device, if a through hole through which light from the light guide member leaks is provided behind the case, the leaked light is diffusely reflected by the rough surface of the overcoat layer of the display panel and is visible to the user. There was a problem.

SUMMARY OF THE INVENTION Accordingly, an object of the present disclosure is to provide a display device capable of reducing the diffusion of light on the front surface of the display panel.

In order to achieve the above object, a display panel 1 having a light diffusion layer 13 on the front surface, a case member 3 having a front portion 332 covering the front of the display panel 1, and a light source 73 for supplying light to the front portion 332 are provided. , wherein the front portion 332 has a through portion 333 at a position facing the display plate 1, and the display plate 1 has the light diffusion layer 13 at a position facing the through portion 333. It is characterized by having a light diffusion non-forming portion 15 that is not formed.

The present disclosure can provide a display device capable of reducing light diffusion on the front surface of the display panel.

1 is a front view of a display device according to an embodiment of the present disclosure; FIG. FIG. 2 is a cross-sectional view taken along line AA of FIG. 1; The front view which mainly shows a case of FIG. FIG. 4 is a cross-sectional view taken along line BB of FIG. 3; FIG. 4 is a cross-sectional view taken along line CC of FIG. 3; FIG. 4 is a diagram showing paths of light in the present disclosure;

Although embodiments of the disclosure will be described with reference to FIGS. 1-6, the disclosure is not limited to these embodiments and various modifications can be made without departing from the disclosure.

In the following description, in order to facilitate understanding of the configuration of the display device 100, the direction in which the driver seated in the driver's seat of the vehicle from the display device 100 (first display panel 1 side) is defined as " The front (front)" and the opposite side (circuit board 4 side) are referred to as the "rear (rear)", which are indicated by arrows "Fr." and "Re." in the figure, respectively. In addition, "top", "bottom", "left", and "right" will be appropriately described as arrows "To.", "Bo.", "L", and "R" in the drawing.

A vehicle display device 100 according to an embodiment of the present disclosure is mounted on a vehicle (for example, an automobile) and configured as an instrument device that displays a predetermined measured quantity (vehicle speed, etc.).

As shown in FIGS. 1 and 2, the display device 100 includes a first display panel (display panel) 1, a second display panel 2, a case member 3, a circuit board 4, a display 5, and a light guide. 6, a light source 7, a pointer 8, and a label 9.

As shown in FIG. 4, the first display panel 1 is formed by forming various printed layers on the front and rear surfaces of a base material 11 made of a thin plate-shaped translucent synthetic resin (for example, polycarbonate). . The first display panel 1 includes a light-shielding layer 12 printed with light-shielding ink such as black on the rear surface of the substrate 11 and an overcoat layer (light diffusion layer) printed with transparent translucent ink on the front surface of the substrate 11. layer) 13.

The light shielding layer 12 has an index portion 121 , a see-through window 122 and an indicator 123 . The index portion 121 is formed by printing the light shielding layer 12 with a design such as a scale or numeral indicated by the pointer 8 by extracting. The see-through window 122 is formed by printing the light shielding layer 12 in a substantially rectangular shape at a position facing the display section 511 of the display device 5 . The indicator 123 is formed by extracting and printing the light shielding layer 12 in the design of various operation lights and warning lights such as turn lights and high beams.

The overcoat layer 13 is formed to have a rough surface with fine unevenness on the front surface. The overcoat layer 13 is formed over the entire area of the first display panel 1 and is formed on the front surfaces of the indicator portion 121 , the see-through window 122 and the indicator 123 .

As shown in FIG. 5, the second display panel 2 is formed by forming various printed layers on the front and back sides of a base material 21 made of translucent synthetic resin (for example, polycarbonate) molded into a thin plate. The second display panel 2 has a light shielding layer 22 formed with light shielding ink such as black on its front surface. The light shielding layer 22 has a decorative design portion 221 . The decorative design portion 221 is formed by extracting and printing the light shielding layer 22 in a rectangular design.

A plurality of light sources 7 are mounted on the front side of the circuit board 4 . The light source 7 has a first light source 71 , a second light source 72 and a third light source (light source) 73 .

The first light source 71 and the second light source 72 are, for example, front-mounted LEDs (Light Emitting Diodes) of predetermined colors. The third light source 73 is composed of, for example, front-mounted LEDs of RGB (RED, GREEN, and BLUE) three primary colors. The light emitted by the first light source 71 causes the index portion 121 and the pointer 8 to emit light. The light emitted by the second light source 72 causes the indicator 123 to emit light. The light emitted by the third light source 73 is supplied to the front portion 332, which will be described later, through the light guide 6, and causes the decorative design portion 221 to emit light.

The case member 3 is made of white synthetic resin (for example, polypropylene) and supports the first display panel 1 on the front surface. The case member 3 has a first lighting chamber 31 , a second lighting chamber 32 , a third lighting chamber 33 , a housing portion 34 , a mounting portion 35 and a receiving portion 36 .

The first lighting chamber 31 is formed so as to surround the plurality of first light sources 71 and guides the light from the first light sources 71 to the index portion 121 and the pointer 8 . The second lighting chamber 32 is formed in a tubular shape so as to surround the second light source 72 and guides the light from the second light source 72 to the indicator 123 . The third lighting chamber 33 accommodates the light guide 6 inside and guides the light from the third light source 73 to the decorative design section 221 .

The third lighting room 33 is composed of a rear portion 331 and a front portion 332, as shown in FIGS. The rear part 331 is formed in a cylindrical shape so as to surround each of the two third light sources 73 and is arranged at a position not supporting the first display panel 1 . One end of the rear portion 331 contacts the circuit board 4 and the other end is positioned at the same height as the first display panel 1 .

The front portion 332 protrudes forward of the first display panel 1 from the front side of the rear portion 331 . The front part 332 extends so as to overlap the front surface of the first display panel 1 and is formed so as to overlap the receiving part 34 as well. The front part 332 is formed to connect the two rear parts 331 . Thus, the front portion 332 is formed to cover a portion of the first display panel 1 and a portion of the housing portion 34 from the front.

The front portion 332 has a through hole (through portion) 333 . The through hole 333 is a through hole that is formed at a position facing the receiving portion 36 and allows the receiving portion 36 to be visually recognized from the front. The through hole 333 is a hole provided for forming the receiving portion 36 in a mold that opens in the front-rear direction and molds the case member 3 .

The second display panel 2 is arranged to cover the front side of the front portion 332 . The front part 332 supports the second display panel 2 from behind.

The accommodation portion 34 is formed in a rectangular tubular shape and accommodates the display device 5 therein. The mounting portion 35 is a front portion of the case member 3 and supports the first display panel 1 from behind.

The receiving portion 36 protrudes from the wall of the housing portion 34 toward the indicator 5 . The receiving part 36 is arranged behind the front part 332 and behind the first display panel 1 to support the back of the first display panel 1 . The outer peripheral end surface 14 of the first display panel 1 is supported between the back of the front portion 332 and the front surface of the receiving portion 36 . Accordingly, the first display panel 1 is arranged at a position facing the through hole 333 .

The circuit board 4 is made of, for example, a hard wiring board in which a wiring pattern is applied to a glass epoxy base material, and electronic components are conductively connected (arranged) to the wiring pattern. The electronic parts include, for example, a driving body for driving the hands 8, a light source 7, a plurality of IC (Integrated Circuit) chips 41, resistors, capacitors, and the like.

The IC chip 41 is a thin rectangular microchip and is mounted on the back side of the circuit board 4 . The IC chip 41 functions as a GDC (Graphics Display Controller), a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). Based on the control signal, the driving main body, the light source 7, the display 5, etc. are driven and controlled.

The display device 5 is arranged behind the first display panel 1, and includes a liquid crystal display panel 51, a backlight unit 52 for transilluminating the liquid crystal display panel 51, and a metal case for housing the liquid crystal display panel 51 and the backlight unit 52. 53 and . The liquid crystal display panel 51 is a TFT-type color LCD cell with polarizing members attached to the front and rear surfaces thereof, and is capable of displaying various vehicle information such as a speedometer, odometer, fuel consumption meter, and time in the form of images. A portion 511 is provided. The display unit 511 can be visually recognized by the viewer through the see-through window 122 .

The light guide 6 is made of translucent synthetic resin (for example, acrylic) containing a light diffusing material. The light guide 6 is accommodated in the third lighting chamber 33 and has a light receiving portion 61 and an emitting portion 62, as shown in FIGS. The light receiving section 61 is arranged at a position facing the third light source 73 and receives light from the third light source 73 . The light receiving portions 61 are formed at two locations. The light receiving section 61 has a first reflecting section 611 that reflects the light received from behind toward the emitting section 62 .

The emitting portion 62 is formed so as to connect the two light receiving portions 61 . The output section 62 is arranged at a position facing the decorative design section 221 . A through-hole 333 is formed behind the emitting portion 62 . The emitting portion 62 has a second reflecting portion 621 that reflects the light from the light receiving portion 61 toward the emitting portion 62 behind the decorative design portion 221, and the second reflecting portion 621 that reflects the light from the second reflecting portion 621 to the decorative design portion. and a third reflecting portion 622 that reflects toward 221 .

The pointer 8 has an indicating portion 81 made of translucent resin (eg, polycarbonate) and a pointer cap 82 made of opaque resin (eg, ABS). The pointer 8 is connected to the rotating shaft of the driving body, and indicates the index portion 121 with the indicating portion 81 . The drive body is composed of a movable magnet type drive body, a stepping motor, etc., and is mounted behind the circuit board 4, with a rotating shaft protruding forward. The display device 100 constitutes an analog tachometer with the pointer 8 and the index portion 121 .

The end paper 9 is made of black synthetic resin (for example, polypropylene). The facing 9 is arranged in front of the first display plate 1 and the second display plate 2, and covers the visible area of the display device 100, that is, the pointer 8, the index portion 121, the see-through window 122, the indicator 123, and the decorative design portion 221. expose. A transparent or translucent see-through panel (not shown) formed in a curved shape, for example, is arranged on the front side of the facing 9 .

As shown in FIG. 5, the first display panel 1 has an overcoat non-formed portion (light diffusion non-formed portion) 15 on which the overcoat layer 13 is not printed on the front surface. That is, the overcoat non-formation portion 15 does not have a printed layer, and the front side of the base material 11 is exposed. The overcoat non-formed portion 15 is formed slightly inside the range (position) facing the front portion 332, so that it is formed in a range that is not visually recognized by the user. The overcoat non-formation portion 15 is formed in a range including a range (position) facing the through hole 333 .

By being formed in this way, as shown in FIG. leak from. The light L2 leaked from the emitting portion 62 passes through the through hole 333 and is irradiated to the front surface of the first display panel 1. As shown in FIG.

When the overcoat layer 13 is formed on the front surface of the first display panel 1 facing the through holes 333, the light L2 passing through the through holes 333 is diffused and reflected by the rough surface of the overcoat layer 13. It becomes the diffused light L3. When this diffused light L3 is reflected toward the see-through window 122, it is irradiated outside the front portion 332 and is visually recognized by the user.

However, in this embodiment, the front surface of the first display panel 1 facing the through hole 333 is the overcoat non-formed portion 15, and the light L2 irradiated to the front surface of the first display panel 1 is diffused by the base material 11. It becomes straight light L4 that is reflected without being reflected. The linear light L4 is then attenuated while being reflected between the back surface 334 of the front portion 332 and the overcoat non-formed portion 15, so that it is not visually recognized by the user.

The present disclosure is not limited to the above-described embodiment, and various modifications are possible within the scope of the present disclosure. For example, in the present embodiment described above, the display device 5, which is display means of the display device, may be an organic EL (Electro Luminescence) module. In addition, the overcoat non-formed portion 15 does not have a printed layer, and the front side of the base material 11 is exposed, but it may be any material that reflects light without diffusing it, for example, a glossy black color. may have a printed layer of

INDUSTRIAL APPLICABILITY The present disclosure relates to a vehicular display device, and can be applied, for example, to a vehicular display device that is mounted on a moving body such as an automobile, a motorcycle, or an agricultural machine or a construction machine.

1 First display board (display board)
REFERENCE SIGNS LIST 11 base material 12 light shielding layer 13 overcoat layer (light diffusion layer)
15 overcoat non-formed portion (light diffusion non-formed portion)
2 second display plate 3 case member 33 third lighting chamber 331 rear portion 332 front portion 333 through hole (through portion)
34 Accommodating Part 36 Receiving Part 4 Circuit Board 5 Display Member 6 Light Guide 7 Light Source 71 First Light Source 72 Second Light Source 73 Third Light Source (Light Source)
8 Guidance 9 Endpaper

Claims (5)

a display panel having a light diffusion layer on the front surface;
a case member having a front portion covering the front of the display plate;
a light source that supplies light to the front portion;
The front portion has a through portion at a position facing the display plate,
A display device according to claim 1, wherein the display plate has a light diffusion non-formed portion in which the light diffusion layer is not formed at a position facing the penetration portion. 2. The display device according to claim 1, wherein the light diffusion non-forming portion is a base material of the display panel. 3. The display device according to claim 2, wherein the display panel has a black printed layer on a rear surface facing the non-light diffusion formed portion. 2. The display device according to claim 1, wherein the light diffusion non-forming portion has a black printed layer. 2. The display device of claim 1, wherein the light diffusion non-forming portion is formed at a position facing the front portion.

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