JPH02264289A - Video display device for automobile - Google Patents

Abstract

PURPOSE:To display an image on a large screen by reflecting the light beam which is emitted by a light source installed at the rear part of the automobile and transmitted through a liquid crystal panel and thus projecting the video on the screen. CONSTITUTION:A television antenna 8 receives a television radio wave and a tuner and driving circuit 5 converts the received signal into a video signal which can drive the liquid crystal panel 4, thereby driving the liquid crystal panel 4 with the signal. The light beam 14 from the light source 6 is made incident on the liquid crystal panel 4. Thus, the liquid crystal panel 4 is driven with the video signal and the light is made incident, so the image is projected on the liquid crystal panel 4 and the light beam 14 which is transmitted through the liquid crystal panel 4 passes through an opening part 12 and reflected by a mirror 3. The light beam 14 which is reflected by the mirror 3 is made incident on a raised hood 2 and the image which is projected on the liquid crystal panel 4 is projected. Consequently, a large-sized image can be projected on the screen member installed on the automobile 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automobile video display device for displaying images such as television or video in an automobile.

2. Description of the Related Art A conventional video display device for an automobile has a configuration as shown in FIG. In FIG. 3, 1 is a car, 8 is a television antenna, and 13 is a television receiver. Its operation will be explained next. The television radio waves received by the television antenna 8 are input to the television receiver 13 installed on the ceiling,
Images were being displayed on the cathode ray tube of television receiver 13.

Problems to be Solved by the Invention However, in such a configuration, there is a limit to the size of the television receiver 13 because it is installed inside the vehicle, and therefore there is a problem in that the screen is small.

The present invention solves these problems and aims to provide an automobile video display device that displays video on a large screen.

Means for Solving the Problems In order to achieve the above object, the present invention provides a light source installed at the rear of a car, a liquid crystal panel installed in front of the light source to display a predetermined image, and a liquid crystal panel installed in the rear window of the car. and a mirror that reflects the light rays emitted from the light source and transmitted through the liquid crystal panel, and a screen member that projects the image.

According to the present invention, the ratio between the screen size of the liquid crystal panel and the screen size of the image projected on the screen member is equal to the ratio of the optical path length from the light source to the liquid crystal panel and the optical path length from the light source to the screen member. . The optical path length from the light source to the LCD panel is short, and the optical path length from the light source to the screen member is long. The ratio is sufficiently larger than 1. Therefore, the ratio between the size of the liquid crystal panel and the size of the screen on the screen member is sufficiently larger than 1, and a large screen can be obtained on the screen member.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram of the configuration of an automobile video display device according to an embodiment of the present invention. In FIG. 1, 1 is an automobile, and 2 is a bonnet used as a screen member. 3 is a mirror installed on the rear window 10. Reference numeral 4 denotes a liquid crystal panel, which is installed in front of the light source 6 between the light source 6 and the mirror 3 in the rear trunk compartment 9 of the automobile 1. 5 is a tuner and a drive circuit, and 6 is a light source, which are installed in the trunk room 9. Reference numeral 7 denotes a video tape recorder, which is installed near the driver's seat of the automobile 1. 8 is a TV antenna, and 11 is indoors. Reference numeral 12 denotes an opening, which is provided between the trunk room 9 and the interior 11, and is provided at a position where the light beam 14 emitted from the light source 6 and directed toward the mirror 3 can pass through.

FIG. 2 is an explanatory diagram showing the progress of light rays in an automobile video display device according to an embodiment of the present invention.

The operation of the automobile video display device configured as described above will be described below.

First, the TV antenna 8 receives TV radio waves, the tuner and drive circuit 5 converts the received signal into a video signal that can drive the liquid crystal panel 4, and the signal is used to drive the liquid crystal panel 4.
to drive. On the other hand, a light beam 14 from the light source 6 enters the liquid crystal panel 4. In this way, the liquid crystal panel 4 is driven by a video signal, and since light is incident thereon, an image is displayed on the liquid crystal panel 4. Further, the light beam 14 transmitted through the liquid crystal panel 4 passes through the opening 12 and is reflected by the mirror 3. The light beam 14 reflected by the mirror 3 enters the raised bonnet 2 and projects an image on the liquid crystal panel 4.

The above description has focused on the progress of the light ray 14 in the side sectional view of the automobile in FIG. 1, but when this is seen in the plan view of the automobile in FIG. However, the light beam 14 spreads symmetrically with respect to the center line 15 and projects an image onto the hood 2.

The ratio of the screen size of the liquid crystal panel 4 to the screen size on the hood 2 is equal to the ratio of the optical path length from the light source 6 to the liquid crystal panel 4 and the optical path length from the light source 6 to the bonnet 2. If the optical path length from the light source 6 to the liquid crystal panel 4 is Lc, the optical path length from the light source 6 to the bonnet 2 is Lb, and the screen size of the liquid crystal panel 4 is Dc, then the screen size Db on the bonnet 2 is D b = D c L b / L c.

For example, Lc=100mm, Lb=2000nvn.

If Dc=4 inches, a large screen of Db=80 inches can be obtained.

Furthermore, by connecting a video tape recorder 7 to the tuner and drive circuit 5, video images such as movies can be displayed on the hood 2 on a large screen. Furthermore, a video game machine is connected to the tuner and drive circuit 5,
You can also enjoy playing games.

If bonnet 2 is white, just use bonnet 2.
However, if the screen is spread over the hood 2, images can be projected even when the hood color is other than white.

Note that audio can be heard inside the car 1 by connecting an FM oscillator to the tuner and drive circuit 5, transmitting radio waves, and receiving the radio waves through the FM radio of the car 1.

Effects of the Invention As described above, according to the present invention, a large screen image can be projected onto a screen member installed in an automobile, and a large screen can be realized even inside the automobile.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an automobile video display device according to an embodiment of the present invention, and FIG. 2 is a plan view of the automobile according to an embodiment of the present invention, showing how light rays travel in the automobile video display device. The explanatory diagram, FIG. 3, is a configuration diagram of a conventional video display device for an automobile. 1...car, 2...bonnet, 3
...Mirror, 4...LCD panel, 6...
···light source.

Claims (1)

[Claims] A light source installed at the rear of a car, a liquid crystal panel installed in front of the light source to display a predetermined image, and a mirror installed in the rear window of the car to reflect the light emitted from the light source and transmitted through the liquid crystal panel. and a screen member for projecting the image.