Display device

Abstract

To prevent visibility of an operator due to non-seeing from being deteriorated sufficiently.SOLUTION: A display device comprises a display board 21 which is provided with a display mark with light transmissivity and a light source 26 which is disposed on a rear surface side of the display board 21 and emits outgoing beam for lighting toward the display mark, and is provided with a visual field angle characteristic correction member 23 which corrects visual field angle characteristic of transmitted beam by restraining transparency of slanted incident light on the light source 26 side of the display board 21. In addition, it is provide with a linear polarization board 22 which restricts the outgoing beam to a P wave component in a front glass direction of a vehicle at which the display device is arranged, between the display board 21 and the visual field angle characteristic correction member 23.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a display device, and can be applied to a display device (warning indicator) that provides vehicle information to a driver by illuminating a light-transmitting display mark formed on a display board with a light source. [Background technology]

[0002] 2. Description of the Related Art Conventionally, various ideas have been proposed for display devices that provide vehicle information to a driver by illuminating a light-transmitting display mark formed on a display board with a light source (for example, Patent Document 1).

[0003] In such display devices, when the emitted light is reflected on the vehicle's windshield, causing a so-called glare, the scenery outside the vehicle seen through the windshield may overlap with the glare, reducing the driver's visibility.

[0004] For this reason, for example, the display device or windshield are adjusted so that the reflected position is out of the driver's field of vision, or a light-blocking component called a visor is placed around the display device to block the emitted light heading toward the windshield. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2011-133657 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, due to design considerations, it may not be possible to adjust the display device or windshield, and it may also be difficult to install a visor, which can result in the problem of being unable to fully prevent reduced visibility for the driver due to reflections. The present invention has been made in consideration of the above points, and has an object to sufficiently prevent a decrease in visibility for a driver due to reflections. [Means for solving the problem]

[0007] In order to solve the above problem, the invention of claim 1 comprises: A display means having a light-transmitting display design; a light source disposed on the rear side of the display means and emitting illumination light toward the display design; A viewing angle characteristic correcting member for correcting the viewing angle characteristic of the transmitted light by suppressing the transmission of obliquely incident light is provided on the light source side of the display means.

[0008] The invention of claim 2 is as follows in the configuration of claim 1: Between the display means and the viewing angle characteristic correction member, there is provided a linear polarizing plate that limits the emitted light to a P-wave component in a direction toward a windshield of a vehicle in which the display device is disposed. Effect of the Invention

[0009] According to the present invention, the viewing angle characteristic correction member can suppress light emitted in the direction of the windshield of the vehicle. This reduces glare, and even in cases where the display device or the windshield cannot be adjusted, and even in cases where it is difficult to provide a visor, it is possible to sufficiently prevent a decrease in visibility for the driver due to glare.

[0010] Furthermore, according to the invention of claim 2, by using a linear polarizing plate to limit the outgoing light to the P-wave component in the direction of the vehicle's windshield, the reflectance on the windshield can be reduced, and the deterioration of the driver's visibility due to reflections can be further prevented. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram illustrating a display device according to a first embodiment of the present invention. [Diagram 2]FIG. 2 is a plan view showing the display device of FIG. [Diagram 3] 3 is a cross-sectional view showing the display device of FIG. 2 taken along line AA. [Figure 4] FIG. 4 is a cross-sectional view showing a display device according to another embodiment in comparison with FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [First embodiment] FIG. 1 is a schematic diagram illustrating a display device according to a first embodiment of the present invention. The display device 1 is disposed on the dashboard of a vehicle, and illuminates a light-transmitting display mark formed on a display board with a light source to provide vehicle information to a driver 2. In the display device 1, the display mark can be visually recognized by direct incidence of emitted light L1 toward the driver 2 into the eyes of the driver 2. However, when emitted light L2 toward the windshield 3 is reflected by the windshield 3 and enters the eyes of the driver 2, so-called glare occurs.

[0013] 2 is a plan view of the display device 1. The display device 1 has an image display unit 11 made of a liquid crystal display panel in the center, which displays vehicle information such as vehicle speed. Furthermore, the display device 1 has display marks M1 to M4 on the left and right of the image display unit 11 as display designs. Here, the display marks M1 and M2 are display marks for the left and right turn signals, the display mark M3 is a display mark for a hazard lamp, and the display mark M4 is a display mark for a headlight. The display device 1 notifies the driver 2 of the blinking of the turn signals, etc., by lighting up these display marks M1 to M4.

[0014] Fig. 3 is a cross-sectional view showing the portion of the display mark M4 of the display device 1 of Fig. 2 taken along line AA. The display device 1 comprises a display plate 21 as a display means, a linear polarizing plate 22, a viewing angle characteristic correction film (viewing angle characteristic correction member) 23, a diffusion plate 24, a substrate 25, a light source 26, a case 27, a packing 28 as a cushioning member, and a resin housing (not shown) that houses these components. The resin housing here constitutes the exterior case of the display device 1. The other display marks M1 to M3 are also constructed in the same manner as the display mark M4.

[0015] Here, the display plate 21 is made of a plate-shaped material with a small retardation value such as inorganic glass, and a light-shielding layer made of a black printed layer is printed on the back side of the plate-shaped material to form the light-transmitting display marks M1 to M4. Specifically, the display marks M1 to M4 are formed by the portions on which the light-shielding layer is not printed. Note that instead of the plate-shaped material with a small retardation value, a material with a very high retardation value such as a transparent resin material may be used. Note that in this case, the polarization axis of the display plate 21 and the polarization axis of the linear polarizer 22 described later are set to be parallel or perpendicular to each other.

[0016] The linear polarizer 22 is made of a polarizing layer and a protective layer, and is disposed on the rear side of the display panel 21 via a packing 28, and limits the emitted light to P-wave components in the direction of the windshield 3 of the vehicle in which the display device 1 is disposed. The P-wave components can reduce the reflectance of the windshield 3 compared to the S-wave components, and this can further prevent the driver's visibility from being reduced due to reflections.

[0017] The viewing angle characteristic correction film 23 is disposed on the rear surface side of the linear polarizer 22 via a packing 28, and corrects the viewing angle characteristic of the transmitted light by suppressing the transmission of obliquely incident light. Here, the display mark M4 is illuminated and turned on by the light emitted from the light source 26. The viewing angle characteristic correction film 23 suppresses the transmission of obliquely incident light with respect to the light emitted from the light source 26 heading toward the display mark M4.

[0018] Specifically, the viewing angle characteristic correction film 23 is produced by forming strip-shaped light-transmitting sections and light-shielding sections in an alternating sequence so that they stand upright on a transparent film, thereby making the light-shielding sections function like the blades of a blind, suppressing the transmission of obliquely incident light.

[0019] Here, since the emitted light L2 from the display marks M1 to M4 toward the windshield 3 is obliquely emitted light, glare can be reduced by suppressing the transmission of obliquely incident light with the viewing angle characteristic correction film 23. This makes it possible to sufficiently prevent the deterioration of the driver's visibility due to glare even in cases where the display device or the windshield cannot be adjusted and further where it is difficult to provide a visor.

[0020] The diffusion plate 24 is formed by printing on a transparent sheet material such as polycarbonate, and is disposed on the rear surface of the viewing angle characteristic correction film 23 via a packing 28, and diffuses and emits the light emitted from the light source 26. The viewing angle characteristic correction film 23 and the diffusion plate 24 may be integrated together.

[0021] A light source 26, a drive circuit for the image display unit 11, and the like are mounted on the substrate 25. The light source 26 is constituted by a light emitting diode or the like, and emits light toward the diffusion plate 24.

[0022] The case 27 is formed by injection molding a resin material such as polypropylene, and is formed so as to surround the light source 26 with its walls, thereby preventing the light emitted from the light source 26 from leaking to other parts.

[0023] The packing 28 is disposed to fill gaps between the display panel 21, the linear polarizing plate 22, the viewing angle characteristic correction film 23, and the diffusion plate 24. The packing 28 may have an adhesive surface on both sides or on one side, and may be omitted if sufficient for practical use.

[0024] According to the above configuration, by providing the viewing angle characteristic correction film 23, which corrects the viewing angle characteristic of the transmitted light by suppressing the transmission of obliquely incident light, on the light source 26 side of the display board 21, it is possible to suppress the outgoing light emitted in the direction of the windshield of the vehicle. This makes it possible to reduce reflections, and even when the display device or the windshield cannot be adjusted, and further when it is difficult to provide a visor, it is possible to sufficiently prevent the driver's visibility from being reduced due to reflections.

[0025] Furthermore, by providing a linear polarizing plate 22 between the display panel 21 and the viewing angle characteristic correction film 23, which limits the emitted light to P-wave components in the direction of the windshield of the vehicle in which the display device is installed, the reflectance at the windshield can be reduced, further preventing a decrease in visibility for the driver due to reflections.

[0026] Second Embodiment Fig. 4 is a cross-sectional view showing a display device according to a second embodiment in comparison with Fig. 3. In this display device, the diffusion plate 24 is omitted, and a case 37 is provided instead of the case 27.

[0027] Here, case 37 is provided with a light-shielding portion 37A so as to block the light directly above light source 26, and this light-shielding portion 37A reflects the light emitted from light source 26 so that light source 26 cannot be directly viewed through the display mark. Case 37 also has an opening formed so as to surround light-shielding portion 37A, whereby the light emitted from light source 26 is reflected by the inner wall surface of case 37 and emitted from the opening. Note that case 37 is thus produced by injection molding a highly reflective white resin or the like.

[0028] In this way, even if the diffusion plate 24 is omitted and the light blocking portion 37A is provided so as to block the light directly above the light source 26, the same effect as in the first embodiment can be obtained.

[0029] Other Embodiments Although specific configurations suitable for carrying out the present invention have been described in detail above, the configurations of the above-described embodiments can be modified in various ways without departing from the spirit of the present invention. [Explanation of symbols]

[0030] 1 Display device 2. Driver 3. Windshield 11 Image display section 21 Display board (display means) 22 Linear polarizer 23 Viewing angle characteristic correction film (viewing angle characteristic correction material) 24 Diffuser 25 Substrate 26 light source 27, 37 cases 28 Packing 37A Light shielding part M1~M4 Display mark (display design)

Claims

1. A display means having a light-transmitting display design; a light source disposed on the rear side of the display means and emitting illumination light toward the display design; A viewing angle characteristic correction member is provided on the light source side of the display means to suppress transmission of obliquely incident light and correct the viewing angle characteristic of the transmitted light. Display device.

2. A linear polarizing plate is provided between the display means and the viewing angle characteristic correction member, which limits the emitted light to a P-wave component in the direction of the windshield of the vehicle in which the display device is installed. The display device according to claim 1 .

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