JP2516334B2 - Transparent plate with anti-glare function - Google Patents

Description

The present invention relates to a see-through plate disposed as a front cover of a display device, and particularly to the see-through plate for external light irradiating the surface of the see-through plate. The present invention relates to a see-through plate having an anti-glare function for reflecting light rays reflected on the surface of the outside of the visual field other than the visual line direction.

(Prior Art) Generally, various display devices have a see-through plate on the display surface. When a see-through plate is a flat see-through plate such as a glass substrate or a translucent synthetic resin substrate. ,
There is a problem in that the external light that irradiates the surface of the see-through plate is reflected directly toward the line-of-sight direction and the surface of the see-through plate shines to reduce the visibility.

In order to solve such a problem, for example, JP-A-56
There has been proposed a see-through plate having an anti-glare function as disclosed in Japanese Patent Publication No. 133701. This perspective plate will be described with reference to FIG. 5. The rear side of the perspective plate 1 made of a transparent material, that is, the display surface side of a display device (not shown) is formed as a flat surface 2 and the perspective plate 1 is formed. The surface side of the sawtooth-shaped projection 5 is parallel to the flat surface 2 and is formed by a perspective surface 3 inclined at a set angle and a rising wall surface 4A formed in a direction orthogonal to the flat surface 2. It is formed in a linear shape.

Therefore, a part of the external light rays is reflected by the see-through surface 3 that is the inclined surface of the saw-toothed protrusion 5 and is guided to the outside of the visual field other than the line-of-sight direction, and the antiglare function is achieved.

(Problems to be Solved by the Invention) By the way, an irradiation light from an internal light source or a self-luminous display disposed on the back side of the see-through plate 1 enters the see-through plate 1 from the back side of the see-through plate 1, The display form of the self-luminous display device can be read by being guided into the visual field through the transparent surface 3 inclined at the set angle.

However, since the irradiation light from the display device or the like is emitted radially, a part of the irradiation light is transmitted through the see-through plate 1.
The internal irradiation light beam 6 is internally reflected by the vertical rising wall surface 4A of the saw-toothed protrusion 5, and the reflected light 7 reflected from the internal surface is guided to the visual field in the line-of-sight direction and is an inclined surface. There is a problem that the top portion of the see-through surface 3 shines, and a plurality of images are overlapped with each other so that the visibility is likely to deteriorate.

The present invention has been made in view of the above circumstances, and provides a see-through plate having an anti-glare function that can prevent the vertical surface portion from shining and images to be seen by overlapping in plural by adjusting the viewing angle. To aim.

(Means for Solving the Problems) The feature of the present invention is that the rising wall surface of the saw-toothed projection is inclined at a set angle with respect to the perpendicular of the flat surface, so that the internal wall reflecting the inclined rising wall surface This is to improve the visibility by suppressing the amount of the reflected light of the irradiation light beam guided into the visual field.

(Function) The internally irradiated light rays incident from the back side of the display surface are reflected by the rising wall surface and the amount of light guided in the field of view is reduced as compared with the vertical rising wall surface.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 4, the rear surface side of the see-through plate 1 formed of a colorless transparent material or a colored transparent material, that is, the display surface side of a display device (not shown) is formed as a flat surface 2 and the front surface side thereof. A saw-toothed protrusion 5 having a cross-sectional shape that is inclined with respect to the flat surface 2 at a set angle and a rising wall surface 4 that is formed in a direction substantially orthogonal to the flat surface 2. Formed on the rising wall surface 4
Is formed so as to be inclined at a set angle θ with respect to the perpendicular of the flat surface 2.

In this case, the inclination angle θ of the rising wall surface 4 when the line of sight is almost fixed in the vertical direction with respect to the flat surface 2 of the see-through plate 1 is obtained as follows. That is, when the inclination angle of the see-through surface 3 is set to α as shown in FIG. 3, the internally radiated light ray 6 incident on the see-through plate 1 from the back side is perpendicular to the flat surface 2 as a refracted ray 6A having a refraction angle α. Guided in the directional field of view. Then, the angle of the internal irradiation light ray 6 passing through the valley portion 8 of the saw-toothed protrusion 5 becomes the inclination angle θ of the rising wall surface 4. In this case, the inclination angle θ of the internally irradiated light ray 6 with respect to the perpendicular of the flat surface 2 is obtained by θ = α−β (where β is the incident angle of the internally irradiated light ray 6), and β is (Where n is the refractive index of the medium), Obtained by

The angle θ when the line of sight is in the direction of inclination with respect to the perpendicular of the flat surface 2 of the see-through plate 1 is obtained as follows. That is, as shown in FIG. 4, when the perspective surface 3 has an inclination angle α and the line-of-sight direction is in the direction of the inclination angle γ with respect to the flat surface 2, the internal irradiation light beam 6 incident on the perspective plate 1 from the rear side has a refraction angle of α-γ
Is guided as a refracted light beam 6A in the visual field. Then, the inclination angle of the internal irradiation light beam 6 passing through the valley portion 8 of the saw-toothed projection 5 rises and becomes the inclination angle θ of the wall surface 4. In this case, the inclination angle θ of the internally irradiated light ray 6 with respect to the perpendicular of the flat surface 2 is Next to Obtained by In this case, when γ = 0, the equation is the same as that obtained from FIG.

Therefore, by the see-through plate 1 having the above-mentioned configuration,
As shown in the figure, a light beam emitted from, for example, a self-luminous display (not shown) disposed on the back side of the see-through plate 1 enters the see-through plate 1 from the back side of the see-through plate 1. Angle α
The light is guided into the field of view through the transparent surface 3 that is inclined at, and a self-luminous display (not shown) is provided by the large transparent area 3.
The display form of can be read.

Further, since the irradiation light from the display device or the like is generally emitted radially, a part of the irradiation light enters the see-through plate 1 and the incident internal irradiation light 6 is a broken line in FIG. As shown in, in the conventional configuration, the inner wall is reflected on the rising wall surface 4A formed perpendicular to the flat surface 2 and tries to reach the visual field in the line-of-sight direction as indicated by the broken line. Inclination angle of the wall surface 4 obtained by the above formula Alternatively, by forming it at an angle close to the inclination angle θ, the internally radiated light beam 6 entering the see-through plate 1 rises as shown by the solid line in FIG. 7 can be led out of the field of view, and as a result, compared to the case of the conventional rising wall surface 4A formed perpendicular to the flat surface 2, the reflected light of the rising wall surface entering in the line of sight can be reduced, so that the visibility is improved. It has become possible to improve.

The transparent plate is preferably a transparent and colorless transparent or colored synthetic resin sheet, or a transparent glass substrate, and the transparent plate is attached to the transparent base material as a means for applying the sheet material. Good.

〔The invention's effect〕

According to the present invention, the rising wall surface of the sawtooth projection is inclined with respect to the vertical line of the flat surface so as to suppress the amount of light reflected by the internally reflected light rays from the rising wall surface in the visual field. Visibility is enhanced by preventing the parts from shining and the appearance of multiple overlapping images.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view, and FIG. 3 is a schematic explanatory view showing an inclination angle of a rising wall surface when there is a line of sight in a direction perpendicular to a flat surface. The figure is a schematic explanatory view showing the inclination angle of the rising wall surface when there is a line of sight other than the direction of the normal to the flat surface, and FIG. 5 is a schematic explanatory view of the see-through plate showing the conventional configuration. 1 ... see-through plate 2 ... flat surface 3 ... see-through surface 4, 4A ... rising wall surface 5 ... sawtooth projection 6 ... internally emitted light beam 7 ... reflected light θ ... rising wall inclination angle

Claims (1)

(57) [Claims] 1. A transparent plate is formed of a colorless transparent material or a colored transparent material, a flat surface is formed on the back side of the transparent plate, and the flat surface is integrally inclined at a set angle with respect to the flat surface. Forming a projection having a sawtooth-shaped cross section formed in a parallel line shape, which is formed by a transparent surface and a rising wall surface formed in a direction substantially orthogonal to the flat surface, and an inclination angle θ of the rising wall surface with respect to a perpendicular to the flat surface. Is at least (Wherein α is the inclination angle of the see-through surface, n is the refractive index of the medium, and γ is the angle in the line-of-sight direction with respect to the flat surface) and an inclination angle approximate to that angle is set to the rising wall surface. A see-through plate having an anti-glare function, characterized by reflecting the reflected light of internally reflected light rays which is reflected out of the visual field.