JPH05297466A - Display screen device - Google Patents

Abstract

PURPOSE:To facilitate countermeasure in accordance with a visual state by changing the surface state of a screen in accordance with the change of the visual state. CONSTITUTION:A display screen device which displays display information such as a video on the screen 11 is constituted by providing a shape memory alloy 12 in which the shape that the screen 11 is made to be a curved surface state having specified curvature is memorized, and a heater wire 13 being a deformation means for changing the screen 11 from a plane state to a curved surface state having a specified curvature by making the temperature of the alloy 12 specified one and deforming it to the memorized shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display screen device for displaying display information such as images on a screen.

[0002]

2. Description of the Related Art A conventional display screen device, for example, a projection type video screen device, includes a flat screen device having a flat screen and a secondary screen having a curved surface having a predetermined curvature, for example, a quadric surface in cross section. There is a curved screen device.

In the flat screen device, as shown in FIGS. 7 and 8, the projection light projected from the projection light source 1 is reflected on the display surface (front surface) of the flat screen 2, but at the center of the screen. The larger the distance from the section 3 (corresponding to the projection optical axis of the projection light source 1), the larger the reflection angle. That is, the relationship (reflection angle a, b, c, reflection angle d, e is a>b> c, d> e.
Therefore, as the viewing angle increases, the illuminance decreases as the distance from the central portion 3 increases.

In the quadric surface screen device, as shown in FIGS. 9 and 10, the projection light projected from the projection light source 4 has a display surface (front surface) of the screen 5 having a quadric surface in section.
However, there is no significant difference in the reflection angle between the central portion (corresponding to the optical axis of the projection light source 4) 6 and the peripheral portion (that is, the reflection angles f, g, h and the reflection angles i, j are Therefore, the viewing angle becomes small, and at the same time, the illuminance becomes uniform both in the central portion 6 and the peripheral portion.

[0005]

However, in the case of the conventional display screen device, the flat screen device is suitable for being viewed by a plurality of people because the flat screen device has a large viewing angle. Can't get,
Further, the quadric surface screen device can obtain a high quality display with little unevenness in illuminance, but since the viewing angle is small, it is not suitable for being viewed by multiple people, and is suitable for being viewed by one person. However, there is a problem that both the flat screen device and the quadric surface screen device must be prepared in order to cope with the diversification of visual aspects.

[0006]

A display screen device according to the present invention includes a shape memory alloy in which a shape of a screen having a curved surface with a predetermined curvature is stored, and the shape memory alloy is heated to a predetermined temperature. By deforming the screen into a memorized shape, the screen is transformed into a curved surface having a predetermined curvature.

[0007]

The display screen device according to the present invention uses the screen as a flat surface when viewed by a plurality of people.
When visually perceived by a person, the shape memory alloy is deformed into a memorized shape at a predetermined temperature by a deforming means, and the above screen is used by converting it from a flat shape into a curved shape having a predetermined curvature. It can be easily dealt with according to the visual aspect.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A display screen device of the present invention, for example, a projection type video screen device will be described below with reference to FIGS.

The display screen device of the present invention comprises shape memory alloys 12 on the four sides and diagonals of the back surface of the screen 11 (the surface opposite to the display surface), and the shape memory alloys 12 are provided on the shape memory alloys 12. It is provided with a heater wire 13 as a deforming means for deforming by heating to a predetermined temperature.

In the above structure, the shape memory alloy 12 is used.
Stores the shape of the screen 11 having a curved surface having a predetermined curvature as shown in FIGS. 5 and 6 in which the cross section has a quadric surface shape. As shown in FIGS. 5 and 6, the flat shape, that is, the linear shape as shown in FIGS. 3 and 4, and the memorized shape, that is, the screen 11 when the temperature reaches a predetermined temperature by heating. It is formed by deforming the cross section into a quadric surface.

Further, both ends of the heater wire 13 are connected to a changeover switch (not shown) for switching ON / OFF of energization of the heater wire 13.

In the display screen device configured as described above, the screen 11 is normally flat as shown in FIGS. 3 and 4, and the projection light projected from the projection light source 14 is the display surface of the screen 11. Although it is reflected on the (front surface), the reflection angle increases as the distance from the center portion (corresponding to the projection optical axis of the projection light source 14) 15 increases (that is, the reflection angles a, b, c, and the reflection angle d). , E is a> b
> C, d> e), the viewing angle becomes large, and therefore, it is suitable for being viewed by a plurality of people.

In the case of visualizing by one person,
A change-over switch (not shown) is switched to energize the heater wire 13, heat generated in the heater wire 13 is applied to the shape memory alloy 12, and the shape memory alloy 12 is deformed. As shown in FIG. 6, the screen 11 is deformed so that the cross section has a quadric surface shape, and the projection light projected from the projection light source 14 is reflected on the surface of the screen 11, and the central portion 16 There is no significant difference in the reflection angles at the periphery (ie reflection angles f, g, h,
Since the reflection angles i and j are substantially equal to each other), the viewing angle becomes small, and at the same time, the illuminance becomes uniform both in the central portion 16 and in the peripheral portion, and a high-quality display image without illuminance unevenness is obtained. Is something that can be done.

[0014]

Since the display screen device of the present invention has the above-mentioned structure, the shape of the shape memory alloy can be changed according to the change of the visual aspect to change the surface state of the screen. Can be easily dealt with.

[Brief description of drawings]

FIG. 1 is a front explanatory view showing an embodiment of a display screen device of the present invention.

FIG. 2 is an enlarged view of part A of FIG. 1 showing an embodiment of the display screen device of the present invention.

FIG. 3 is a schematic plan cross-sectional explanatory view showing a state in which the screen is flat in the embodiment of the display screen device of the present invention.

FIG. 4 is a schematic side cross-sectional explanatory view showing a state in which the screen is flat in the embodiment of the display screen device of the present invention.

FIG. 5 is a schematic plan cross-sectional explanatory view showing a state where the cross section of the screen in the embodiment of the display screen device of the present invention is a quadric surface.

FIG. 6 is a schematic side cross-sectional explanatory view showing a state where the cross section of the screen in the embodiment of the display screen device of the present invention is a quadric surface.

FIG. 7 is a schematic plan sectional view showing a conventional flat screen device.

FIG. 8 is a schematic side sectional view showing a conventional flat screen device.

FIG. 9 is a schematic plan cross-sectional explanatory view showing a conventional quadric surface screen device.

FIG. 10 is a schematic side cross-sectional explanatory view showing a conventional quadric surface screen device.

[Explanation of symbols]

 11 screen 12 shape memory alloy 13 heater wire

Claims (1)

[Claims] 1. A display screen device for displaying display information such as an image on a screen, wherein a shape memory alloy storing a shape of the screen having a curved surface having a predetermined curvature and a predetermined shape memory alloy. A display screen device comprising a deforming means for converting the screen from a flat shape to a curved shape having a predetermined curvature by changing the temperature to a stored shape by setting the temperature.