JPH0363689A - Display device - Google Patents

Abstract

PURPOSE:To eliminate the thermal destruction and the chromatic aberration of a light emitting diode by letting the system of a projecting lens include an infrared non-transmitting lens. CONSTITUTION:At least one part of a glass or plastic window 1 is formed as a translucent mirror on a line corresponding to the position of the eye 4 of a passenger. By arranging the projecting lens 3 on an optical axis, the display of a character, a graphic and a mark, etc., on a light emitting diode type display unit 2 is projected on the part of the translucent mirror of the window 1. The lens is sufficient whether it is single or composite. Since at least one single lens is made the infrared non-transmitting lens, infrared rays are cut by the infrared non-transmitting lens after passing the translucent part of the window 1, thereby preventing the infrared rays from being cast to the light emitting diode of the display unit 2. The character, the mark and the graphic, etc., on the display unit 2 are projected to the translucent part of the window 1 by the lens 3 after correcting the chromatic aberration thereof, and it is viewed as a virtual image 5 with the eye 4. Thus, the thermal destruction and the chromatic aberration are eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a display device, and more particularly to a display device that projects characters, symbols, figures, etc. displayed on a light emitting diode type display onto a semi-transparent mirror using a projection lens.

PRIOR TECHNOLOGY AND ITS PROBLEMS Previously, such display devices are already known, but they rely on the use of a common and ordinary projection lens to project the display of a light emitting diode display onto a semi-transparent mirror. Therefore, if the surface of the semi-transparent mirror opposite the projection lens is exposed to sunlight, depending on the angle of incidence of the sunlight, the infrared rays of the sunlight that has passed through the semi-transparent mirror will pass through the projection lens and hit the light emitting diode. It will destroy it. Light emitting diodes have an operating temperature of about 0 to 40 degrees Celsius and are sensitive to heat. For this reason, the range of application of conventional devices is forced to be considerably restricted.

Furthermore, the light emitted by light emitting diodes has a wide range of wavelengths, and if this was projected using a normal projection lens,
There is also the problem that this causes chromatic aberration in the image, resulting in a blurred image.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device of the above-mentioned type in which the problems of thermal destruction of light emitting diodes and chromatic aberration caused by infrared rays of sunlight are eliminated.

Means for Solving the Problems The above objects of the present invention are achieved by a display device having the following configuration.

A display device that projects a display displayed on a light emitting diode type display onto a semi-transparent mirror on the optical axis of the lens using a projection lens, characterized in that the projection lens system includes an infrared opaque lens. display device.

Function: Since the present invention has the above configuration, when sunlight that has passed through the semi-transparent mirror enters the projection lens system, the projection lens system cuts the infrared rays of the sunlight, and the infrared rays of the sunlight emit light from the display. Avoid hitting the diode. Therefore, the light emitting diode is protected from thermal damage caused by infrared rays of sunlight.

The infrared opaque lens has the property of blocking light with wavelengths outside the peak emission wavelength region of general-purpose light emitting diodes, so the display on the light emitting diode display can be projected onto a semi-transparent mirror by a projection lens system that includes the lens. The resulting image will then have no chromatic aberration.

Effects of the Invention According to the present invention, in a display device in which a display displayed on a light emitting diode display device is projected onto a semi-transparent mirror on the optical axis of the lens by a projection lens, thermal destruction of the light emitting diode due to infrared rays of sunlight is prevented. And the effect of solving the problem of chromatic aberration is brought about.

Therefore, the present invention has a wide range of applicability, unlike the prior art. For example, at least a portion of the windshield of a vehicle such as an automobile, an airplane, or a spaceship is made into a semi-transparent mirror, and information necessary or related to driving or maneuvering is displayed in the form of a light emitting diode, and the display is displayed on the half of the windshield using a projection lens. Application of projection onto a transparent mirror is also possible without any problem. Such a display allows the driver or operator to check the warning information without taking his or her eyes off the road.

Example Next, embodiments of the present invention will be described with reference to the accompanying drawings.

The illustrated embodiment of the present invention is for a vehicle.

In the figure, (1) is a glass or plastic window of a vehicle, etc., and at least a part of the window (1) is a semi-transparent mirror. The part of this semi-transparent mirror is preferably set on a line corresponding to the position of the passenger's eyes (4).

A light-emitting diode type display (2) and a projection lens (3) for projecting the display of characters, symbols, figures, etc. on the display (2) onto the semi-transparent mirror part of the window (1) are attached to the semi-transparent mirror part of the window (1). The transparent mirror portion is placed at a location corresponding to the position on the optical axis of the lens (3). The projection lens (3) may be either a single lens or a compound lens. For convenience, a single lens is shown in the figure as a representative form. At least one single lens of the single lens projection lens or the composite lens projection lens is an infrared opaque lens.

As the infrared opaque lens, for example, a lens made of a plastic material containing an infrared absorbing agent can be advantageously applied.

The infrared opaque lens of the projection lens system transmits through the semi-transparent mirror part of the window (1) and cuts the infrared rays of the sunlight hitting the lens. Therefore, the infrared rays will not hit the light emitting diode of the light emitting diode display (2).

Displays such as characters, symbols, figures, etc. on the light emitting diode display (2) are projected by the projection lens (3) onto the semi-transparent mirror portion of the window (1) with chromatic aberrations corrected.

The projection appears to the eye (4) as a virtual image (5).

In the figure, the broken line shows the sunlight path to the light emitting diode indicator (2), and the solid line shows the optical path of the indicator (2).

[Brief explanation of drawings]

The drawing is an elevational view showing one embodiment of the invention. (1)...Glass or plastic window, at least a portion of which is a semi-transparent mirror (2)...Light-emitting diode type display (3)...Projection lens (and above)

Claims (1)

[Claims] (1) A display device that projects the display displayed on a light-emitting diode type display onto a semi-transparent mirror on the optical axis of the lens using a projection lens, in which the projection lens system includes an infrared opaque lens. Characteristic display device.