JPS61172016A - Displaying apparatus - Google Patents

Abstract

PURPOSE:To control direction property of a light beams from the internal displaying apparatus side and preventing the beams from diverging into a saw teeth part of the prism. CONSTITUTION:In front of a transparent plate 15, a saw-teeth shape prism 25 is formed in such a way that its ridge lines of the top 23 are oriented horizontally running as minute parallel lines. Here, when a power source lamp is turned on, these internal light beams are reflected on the inside wall of the housing 11 to light up the front surface of the displaying plate 13 and they pass a pularized plate 14. At this moment, the internal light beams are incident on the inside wall or other structures and dispersed, trying to pass the plate 14 in all directions, however, a screen 18 interrupts a part of beams emergying, obliquely from the top and bottom directions and only horizontally oriented beam element or staight propagating beams pass through the slits 19 and the transparent plate 15. Consequently, convergent tendency of the beams to the top side of the prism 25 can be prevented and as a result, indications on the inside displaying apparatus can be clearly read through the transparent plate 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device that regulates the direction of irradiation of light rays emitted from a light source built into the display device or emitted by the self-luminous display device itself.

[Conventional technology and its problems]

2. Description of the Related Art Generally, display devices such as instruments and image display devices of automobiles, or various measuring instruments are provided with a transparent plate covering the front surface of the display device.

This type of display device will be explained using automobile instruments as an example. Generally speaking, when a flat transparent plate made of a glass substrate or a synthetic resin substrate with translucent properties is used as a front cover for an indicating instrument such as a vehicle, external light shining onto the surface of the flat transparent plate is used. There was a problem in that the surface of the see-through plate was illuminated by reflection in the direction of the driver's line of sight, making it difficult to read display devices placed behind it, such as the dial of an indicator or a fluorescent display tube. .

In order to solve these problems, various structures have been proposed in which the see-through plate covering the front side of the instrument has an anti-glare function.

For example, a transparent see-through plate is disposed on the front surface of a display device housed in an instrument housing, slanting upward or downward with respect to the direction of the driver's line of sight. In other words, a part of external light is reflected by a transparent plate arranged at a certain angle from the driver's line of sight, and the reflected light is guided outside the driver's field of view in the direction other than the driver's line of sight, thereby achieving an anti-glare effect. It is configured as follows. However, in the anti-glare mechanism with this configuration, since the see-through plate itself is arranged at an angle, the depth dimension of the indicator itself is naturally required, and the problem of space remains due to its structure. I'm doing it.

In addition, in order to avoid this problem, as disclosed in Utility Application No. 55-21751 previously filed by the applicant of the present application, a large number of inclined surfaces with sawtooth cross sections are formed on the surface of the see-through plate. proposed an anti-glare device structure in which the depth of the see-through plate is reduced and the overall depth of the indicator is suppressed.

In this case, the irradiation light from an internal light source installed on the back side of the dial of the indicating instrument, or from a self-luminous indicator such as a fluorescent display tube or a light emitting diode, is directed from the inside of the indicating instrument toward the transparent plate. Because the light rays are irradiated in all directions and pass to the outside, the light rays may converge on the tops of the many sawtooth-like slopes provided on the surface of the see-through plate. Since the ridge line part of the top part appears to be shining like a band because it is visible to the eye, it may be difficult to read the internal display etc.0 [Object of the Invention] The present invention has been made in view of the above problems. This system regulates the direction of the irradiation light from the internal light source built into the display device or the light emitted from the self-luminous display device, and allows the light to pass through the see-through plate placed on the front side of the display device to the outside. It is an object of the present invention to provide a display device that prevents light from converging on a large number of sawtooth prism portions provided on the surface of a transparent plate.

[Means for solving problems]

In order to achieve the above object, the present invention provides fine prisms with a serrated cross-section on the surface of a see-through plate that covers the front surface of a display device.
In addition to forming thin parallel lines, a polarizing plate is arranged on the rear side of the transparent plate to regulate the direction of rays of light, which regulates the direction of the rays of light from the internal display side. The structure is such that only the rays of light that pass through the transparent plate pass through the transparent plate.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. FIGS. 1 and 2 show one embodiment of the present invention, which will be explained here using an automobile meter as an example. A display plate 13 is disposed on the front surface of the display device 12 housed in the instrument housing 11, a polarizing plate 14 (described later) is disposed on the front surface of the display plate 13, and the front surface of the polarizing plate 14 is further covered to cover the outside side. A see-through plate 15 is provided to prevent dust from entering the inside of the instrument housing 11, and a light source 16 for illuminating the display panel 13 is housed in the bottom of the instrument housing 11. Further, a 7-door 17 is formed to protrude forward from the peripheral edge of a see-through plate 150 disposed on the front surface of the instrument housing 11.

The polarizing plate 14 is formed by embedding therein a large number of light shielding plates 18 arranged in parallel in the horizontal direction, and is configured such that the internal light of the light source 16 passes through the slits 19 between the respective light shielding plates 18. There is.

Therefore, the polarizing plate 14 can block only the directional component light rays that come out diagonally from above and below, and can transmit the light rays that have come straight forward.

Further, on the front side of the transparent plate 15, there is provided a view direction 2 of the driver 20.
1 and the top 2 of this vertical surface 22.
The prism 25 has a serrated cross-sectional shape and is formed into fine parallel lines so that the ridgeline of the top part 23 is in the horizontal direction. There is. Although the rear surface of the see-through plate 15 is a flat surface, a prism 25 may be formed in the same manner as on the front surface. Further, although the inclined surface 24 is formed upward from the top 23, it may be formed downward in consideration of the direction of incidence of external light, etc. Furthermore, a sheet material having a prism 25 formed on the surface of the transparent plate 15 is used. You can also paste them together.

The present invention configured as described above will be explained in detail. First, when the light source 16 is turned on, this internal light beam is reflected on the inner wall of the instrument housing 11 and illuminates the front side of the display board 13.
Furthermore, it passes through a polarizing plate 14. At this time, the internal light beams illuminating the front side of the display panel 13 hit the inner walls and other components and are diffusely reflected, and try to pass through the polarizing plate 14 in all directions, but the light beams come out diagonally from above and below due to the light shielding plate 18. is blocked, and only the horizontal component of the light beam or the light beam traveling straight passes through the slit 19 and the transparent plate 15, allowing the driver 20 to recognize the displayed image.

Further, in the above embodiment, the internal light source 16 was installed behind the display board 13 serving as a display device, but in a self-luminous display device such as a light emitting diode or a fluorescent display tube, there is no need to provide a separate light source. However, since the light rays emitted from the self-luminous display device are emitted in all directions like the light source, it is possible to implement the method by arranging a light shielding plate between the display device and the transparent plate. Similarly to the example, the irradiation direction of the light beam can be regulated.

[Other Examples]

Although one embodiment of the present invention has been described in detail above, it can be modified as appropriate within the scope of the gist of the present invention. For example, as shown in FIG. 3, the front surface (
If a second polarizing plate 14A having a second light shielding plate 18A and a second slit 19A formed in the vertical direction is further provided on the rear surface), the internal light rays can further be output diagonally from the horizontal direction, i.e. from the left and right directions. It can also block incoming light rays, and internal light rays emitted in directions other than the line of sight can be blocked.

In the above-described embodiment, two polarizing plates were used, one in the horizontal direction and one in the vertical direction, but one polarizing plate provided with a grid-like light shielding plate was used to polarize the polarizing plates diagonally from the vertical direction and the horizontal direction, respectively. It may be configured to block the emitted light rays, and the amount of irradiated light can be adjusted by appropriately setting the shape, depth, spacing, etc. of the light blocking plate itself.

〔Effect of the invention〕

As described in detail above, according to the present invention, in an image display device, a display device such as a display device for automobile instruments, a display device such as a measuring instrument, a self-luminous display device, etc., the surface of the see-through plate that covers the front surface of the display device. By forming a prism with a serrated cross-section in fine parallel lines, and by arranging a polarizing plate on the back side of the transparent plate to regulate the direction of irradiation of the light beam, the inner side from the display device side can be Since the light rays are irradiated onto the viewing plate with their irradiation direction regulated by the polarizing plate, only the rays with the directionality determined by the prisms provided on the surface of the viewing plate have an anti-glare effect. It is possible to suppress the light rays that pass through the prism and converge toward the top side of the prism, and as a result, it is possible to read the internal display device well through the see-through plate.
In addition, it is possible to guide the irradiated light from the outside in a direction other than the line of sight direction by means of a prism, and it is also possible to suppress the depth dimension of the entire indicating instrument as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an automobile including a display device showing one example of a part of the present invention, FIG. 2 is a partially enlarged exploded perspective view showing a first embodiment of the display device, and FIG. 3 is a cross-sectional view of the same device. FIG. 2 is a partially enlarged exploded perspective view showing a second embodiment. 11. Instrument housing 12. Display 13. Display plate 14. Polarizing plate 15. Transparent plate 18. Light shielding plate 19. Slit 24. Inclined surface 25. Prism patent applicant Nippon Seiki Ill Co., Ltd.
Figure @2 figure

Claims (2)

[Claims] (1) Prisms with a serrated cross section are formed in fine parallel lines on the surface of a transparent plate that covers the front surface of the display device, and a polarizing plate is provided on the rear side of the transparent plate to regulate the irradiation direction of the light beam. A display device characterized in that: (2) The display device according to claim 1, characterized in that a plurality of the polarizing plates are provided.