JPH01292395A - Liquid crystal projector device - Google Patents

Abstract

PURPOSE:To reduce the size and weight of the device and to easily carry the device by supplying DC electric power which is obtained from a solar battery receiving light from a lamp to the driving circuit of a liquid crystal display panel. CONSTITUTION:A power source plug 8 is supplied with an AC voltage, which is led to a main switch 10 through a fuse 9. When the switch 10 is closed, an air blowing fan 12 is impressed with, for example, AC100V and blades rotate to cool the lamp 1, thereby making the operation ready. Further, when a lamp switch 11 is closed, the lamp 1 is impressed with, for example, AC100V to turn on. Further, part of the light 14 emitted by the lamp 1 is absorbed by the solar battery 15 and converted photoelectrically to generate the DC electric power, which is supplied to the driving circuit 6 of the panel 5. Then the battery 15 generates the electric power once it receives the light from the lamp 1, so there is no time delay until an image appears on the panel 5. Thus, the device is reduced in size and weight and easily carried.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an 11ic@ circuit of a liquid crystal projector device suitable for realizing a large screen display.

[Conventional technology]

As shown in Fig. 4 (see Japanese Utility Model Application Publication No. 73153/1983), a conventional liquid crystal projector device collects light emitted from a lamp 1 with a condenser lens (not shown) and displays a transmissive liquid crystal panel. The image on the liquid crystal panel 5 is enlarged and displayed on the screen 30 by projecting the light that has passed through the liquid crystal panel 5 onto the screen 30 using the projection lens 7.

Note that the drive circuit 6 controls the transmittance of each pixel of the liquid crystal panel 5 according to the video signal supplied to a video signal terminal (not shown), and reproduces the video on the liquid crystal panel.

A power supply circuit 831 of the liquid crystal projector device is shown. The commercial AC voltage (for example, AC1) supplied to the power plug 8
00V) is fuse 9. The transformer 20 (/J primary terminal ζ) is connected through the main switch 5y108.

A stepped-down AC voltage is output to the secondary terminal of the transformer 20.N rectifier 21. A DC voltage (for example, DC 5V) is obtained by the smoothing capacitor 22 and supplied to the drive circuit 6 of the liquid crystal panel 5. On the other hand, the blower fan 12 is connected to the main switch 5
When M10 is closed, AClooV is applied, and the blade rotates to send air to the lamp 1 to cool the lamp 1. Also, the lamp switch 5L11 turns the lamp 18 ON and OFF.

To operate the liquid crystal projector device, first, the main switch 5M10 is closed, the air blower 7A 12 is rotated to activate the cooling device, and then the lamp 1 is turned on by the lamp switch SL11. Alternatively, it is known that the main switch and the lamp switch are single-axis rotary switches, in which the 77 switch 12 is operated in the first step and the lamp 18 is turned on in the second step.

[Problem to be solved by the invention]

The above conventional technology requires a power transformer and a rectifier circuit to supply DC power to the liquid crystal display panel drive circuit.
This has been a problem in making the liquid crystal display device a small and lightweight set.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to realize a portable large-screen display in which a liquid crystal projector device is small, lightweight, and easily portable.

[Means to solve the problem]

The above object is achieved by arranging a solar cell inside the liquid crystal 70 diector device and supplying DC power obtained from the solar cell receiving lamp light to a driving circuit of the liquid crystal display panel.

[Effect]

With the above configuration, the driving circuit of the liquid crystal display panel is supplied with power from the solar cell that receives QJ light from the light source and generates a DC voltage. The solar battery operates the LCD projector device, and when the lamp is turned on, it instantly generates DC voltage and supplies power to the drive circuit, so it does not take a long time to start up the LCD panel, and the solar battery Since it is thin and lightweight, it can be easily incorporated into a liquid crystal projector device.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the present invention.

The light emitted from the run 11 is focused by the reflecting mirror 2 and the condensing lens 3.4, illuminates the liquid crystal display panel 58 with strong light, and projects the image on the liquid crystal display panel 5 using the projection lens 7. is projected onto a screen (not shown),
A liquid crystal projector device [13] is used to obtain an enlarged image. The power supply flag 8 indicates a commercial AC voltage (for example, AClo
oV) is supplied and guided to the main switch 5M10 via the fuse 98. When the main switch 5M10 is closed, AC 100V is applied to the blower fan 12, and the blades rotate to cool the lamp 1 and become ready for operation. When the lamp switch 5L11 is closed in the nest, the lamp 1 (for example, 50
AClooV is applied to the 0W/S logen lamp),
Lamp 1 lights up. A part of the light 14 emitted from the lamp 1 is absorbed by the solar cell 15 provided inside the liquid crystal projector device 16, converted into light, and generates DC power, which is supplied to the drive circuit 6 of the liquid crystal display panel 5. Supplied. When the solar cell 15 receives the light from the lamp 1, it instantly generates electric power, so there is no time delay until an image appears on the liquid crystal display panel 5.

Excellent LCD glow projector and 13'5-1c! Since strong light is emitted at a constant intensity from the lamp 1 when the image is being displayed, a constant electric power can be stably obtained from the solar cell 15, and a stable image can be reproduced on the liquid crystal display panel 5.

The 21st figure is a side view showing the second embodiment. Naori J
Components that are the same as those in Example 1 are given the same reference numerals. Second
In the figure, the solar cell 15' is arranged in a plane substantially perpendicular to the optical axis 18 of the optical system. For example, between the condensing lenses 3 and 4, a hollow U] disk-shaped or U]-shaped solar cell 15'
will be established. The light that passed through the hollow part of the solar cell 15' is
The liquid crystal display panel 5 is illuminated as it is. On the other hand, light 14' passing near the edge of the condensing lens 4 is received by the solar cell 15', and is used by the solar cell 15' to generate DC power. The light 14' absorbed by the solar cell 15' is reflected m2
Since the light is concentrated into high energy density light by the condenser lens 4, a large amount of electric power can be obtained from the solar cells 15', and sufficient electric power can be supplied with a small number of solar cells.

FIG. 3 is a side view showing the sixth embodiment. Components that are the same as those in the first embodiment are given the same reference numerals. In Fig. 3, the tychroic concave mirror 2' is a concave mirror made of glass, for example, with a vapor-deposited film of about ten layers formed on the inner surface of the mirror, and has a high reflectance for visible light but a very low reflectance for infrared light. The small one is also Qno.

Therefore, the infrared light emitted from the lamp 1 is not reflected by the dichroic concave mirror 2', and most of the infrared light is transmitted through the dichroic concave mirror 2'. A solar cell 15 is arranged behind the dichroic concave mirror 2', and infrared light 16 transmitted through the dichroic concave mirror 2'
It is designed to receive 8 lights.

When compared at the same illuminance, silicon solar cells can obtain approximately 5 times as much power when receiving light from a tungsten bulb, which contains a lot of infrared light, as compared to fluorescent lamp light, which contains a lot of ultraviolet light. , its spectral characteristics generate maximum power when it receives infrared light with a wavelength of around 900 nm. Therefore, in this embodiment, the solar cell 15 can be used with high efficiency. In this case, the lamp to be used is preferably an incandescent lamp such as a halogen lamp or a tungsten lamp that contains a large amount of infrared light, but is not limited to these lamps. For example, since there is no need to use a power transformer that weighs and has a large volume inside a liquid crystal projector device that realizes a large screen display, it is possible to realize a portable liquid crystal projector device that is small, lightweight, and easily portable.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, FIG. 2 is a schematic diagram showing the Q3 and other (/J) embodiments of the present invention, and FIG. 6 is a schematic diagram showing still another embodiment of the present invention. Fig. 4 is a schematic diagram showing a conventional example. 1...Lamp 2...Reflector 2'...Dichroic concave mirror 5...Liquid crystal display panel 6...Drive circuit 7... Projection lens i5,15'...Solar battery
12...Air blower 1 @ Figure 2 33 Kuchihachi C160V

Claims (1)

[Scope of Claims] 1. A liquid crystal projector device that projects an image formed on a liquid crystal display panel onto a screen using a projection lens by irradiating light from a light source onto the liquid crystal display panel, comprising: a solar cell; A liquid crystal projector comprising: a part of the light from the light source projected onto the solar cell to supply power obtained to drive the liquid crystal panel. 2. In the liquid crystal projector device according to claim 1,
The light source includes at least a lamp and a dichroic concave mirror that reflects visible light with a high reflectance and transmits infrared light, and uses the infrared light that has passed through the dichroic concave mirror as part of the light from the light source. A liquid crystal projector device characterized by projecting onto a solar cell.