JPH0984037A - Liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the configuration of the liquid crystal projector by separating a signal processing circuit, an input signal interface circuit and an input terminal from the main body as a component section. SOLUTION: A caption 1 is a main body of a liquid crystal projector provided with a light source section, a separate optical system, a liquid crystal drive circuit, a liquid crystal panel, a projection lens and an input terminal or the like. Captions 2-6 are component sections with liquid crystal panel driving interfaces with each of video signal, High Vision signal, analog RGB signal, TV tuner signal and scanner signal or the like. A desired section among the component sections 2-6 is connected to an input terminal of the main body section 1 of the liquid crystal projector to realize the liquid crystal projector in response to various input sources and application functions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector device having a structure in which a component part containing various input signal interface circuits can be arbitrarily attached and detached.

[0002]

2. Description of the Related Art Conventionally, a video signal, an S video signal, an audio signal, an analog RGB signal for a computer display signal, etc. have been used as an input source of a liquid crystal projector, and recently, a high definition video signal has also been used. Has been done. The liquid crystal projector is equipped with a large number of input terminals corresponding to these various input signals.
Regarding video signals alone, there are various types of signal systems such as NTSC system, PAL system, SECAM system and the like.

[0003]

Therefore, it is necessary to provide a large number of input terminals in the liquid crystal projector device, and accordingly it is necessary to incorporate a large-scale signal processing circuit. The size is large, and the circuit board size is large and the number of parts is large, which causes a cost increase.

However, if the types of input sources are limited in order to avoid this problem, the product has no choice but to meet a wide range of users' demands. Also,
Separately, heat generated from a light source, etc. inside the liquid crystal projector device causes the inside temperature of the device to become considerably high, and the signal processing circuit inside the device becomes high temperature. Therefore, noise may be mixed into the signal or thermal runaway may occur. In the worst case, the signal processing circuit might be destroyed. If the size of the cooling fan is increased, the temperature inside the device can be suppressed to some extent, but in this case, there is a problem that the size of the device is increased and the cost is increased as in the case described above.

The present invention has been made in view of the above conventional problems, and realizes reduction in size and weight and cost while responding to diversification of types of input sources which are expected to further expand in the future. An object is to provide a liquid crystal projector.

[0006]

In order to solve the above problems, the present invention employs a configuration in which the signal processing circuit, the input signal interface circuit, and the input terminal are separated from the liquid crystal projector as component parts.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the liquid crystal projector device of the present invention, the device main body can be downsized by using the component part equipped with the interface circuit and the terminal corresponding to the desired input source by attaching it to the device main body. Cost reduction can also be realized. Further, when the user desires another input source, it can be dealt with by exchanging with the component part in which the interface circuit and the terminal of the input source are mounted. Furthermore, the cooling fan can be downsized by the amount of the volume of the liquid crystal projector main body,
It is also effective for power saving.

[0008]

Embodiments of the present invention will be described in detail below with reference to FIGS. FIG. 1 shows an embodiment of a liquid crystal projector device of the present invention, 1 is a liquid crystal projector device main body, 2 is a component part equipped with a video signal / liquid crystal panel drive interface circuit, and 3 is a high-definition signal / liquid crystal panel drive. Component part equipped with interface circuit, 4 is component part equipped with analog RGB signal / LCD panel drive interface circuit, 5 is component part equipped with TV tuner signal / LCD panel drive interface circuit, 6 is scanner signal / LCD panel drive The component part equipped with the interface circuit is shown. The user selects the desired type from 2 to 6 components and attaches it to the LCD projector main unit 1 to support various input sources and applications (TV tuner, scanner, game, etc.) LCD projector. The device can be easily realized.

FIG. 2 is a block diagram showing the configuration of the liquid crystal projector device of the present invention. The light output from the light source unit 21 is separated into three components (red, green, and blue) by the optical system 22, and each light is modulated by the liquid crystal panel 24 driven by the liquid crystal drive circuit 25 according to the video signal. The modulated three-component light is recombined by the optical unit 22, passes through the projection lens 23, and is projected on the screen. The liquid crystal drive circuit 25 is equipped with a terminal 26 for inputting a signal, and the heat inside the device is radiated outside the device by a cooling fan 27.

With this configuration, since the interface corresponding to the signal of the desired standard and the input terminal 26 are provided, the information from the desired input source can be projected. Further, the signal processing circuit in the device body is only the liquid crystal drive circuit 25. Therefore, the circuit board size and wiring are small, and the volume of the device body can be reduced, so that even a small cooling fan can be installed in the device body. The temperature can be kept below a predetermined level. Therefore, power saving, size reduction, and weight reduction can be realized. Also, the influence of noise generated from the cooling fan 27 is reduced.

FIG. 3 is a block diagram showing the structure of the component part of the present invention corresponding to the video signal input. An input source such as a video deck or a video camera is connected to the video input terminal 31 according to the output form, and the input video signal is passed through the video / liquid crystal panel drive interface circuit 32, so that the signal is compatible with the liquid crystal drive circuit. Is transmitted to the liquid crystal projector device main body through the output terminal 33.

[0012]

As described above, according to the present invention, it is possible to provide a liquid crystal projector that realizes a reduction in size and weight and a reduction in price while coping with the diversification of types of input sources.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a liquid crystal projector device of the present invention.

FIG. 2 is a block diagram showing a configuration of a liquid crystal projector device body according to the present invention.

FIG. 3 is a block diagram showing a configuration of one of the component parts of the present invention which corresponds to a video signal input.

[Explanation of symbols]

1 ... Liquid crystal projector device main body 2 ... Component portion equipped with video signal / liquid crystal panel drive interface circuit 3 ... Hi-vision signal / Component portion equipped with liquid crystal panel drive interface circuit 4 ... Analog RGB signal / Component part equipped with liquid crystal panel drive interface circuit 5 ・ ・ ・ TV tuner signal / Component part equipped with liquid crystal panel drive interface circuit 6 ・ ・ ・ Scanner signal / Component part equipped with liquid crystal panel drive interface circuit 21 ・ ・ Light source 22. Optical system 23. Projection lens 24. Liquid crystal panel 25. Liquid crystal drive circuit 26. Input terminal 27. Cooling fan 31. Input terminal 32. Liquid crystal panel drive interface circuit 33. Output terminal

Claims (2)

[Claims] 1. A light source and light from the light source are separated into three components of red, green, and blue, or any one of these three components and the other two components, and the three components Alternatively, an optical system that combines the two components, a liquid crystal panel that modulates the light of the separated components according to a video signal, a drive circuit that drives the liquid crystal panel, and a signal that is input to the drive circuit are compatible with the drive circuit. A liquid crystal projector device comprising: a detachable component unit having an interface circuit for converting into a signal. 2. The signal output section of the component section and the signal input section of the liquid crystal projector apparatus body section are automatically connected when the component section is attached to or detached from the liquid crystal projector apparatus body section. 1. The liquid crystal projector device according to 1.