JPH0616939U - LCD projector - Google Patents

Abstract

(57) [Summary] [Structure] A rear projection type liquid crystal projector characterized in that the space between the projection lens and the screen is not covered by an exterior. Therefore, various designs are possible depending on the arrangement of the projection lens and the screen. Another feature is that it uses frosted glass as the screen and has various input modes. [Effect] As a result, the rear projection type liquid crystal projector, which has hitherto been out of the frame of a television, has a greater degree of freedom in design, and has a value as an interior decoration item.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid crystal projector for enlarging and projecting a screen of a liquid crystal display panel.

[0002]

[Prior art]

 An example of a conventional rear projection type projector is shown in FIG. Here is an example of a three-tube type rear projection projector that uses a cathode ray tube. The liquid crystal type is basically the same.

A brief description will be given below with reference to FIG.

Reference numeral 201 is a red projection lens, 202 is a green light projection lens, and there is a blue light projection lens inside although it cannot be seen in the figure. Further, 203 is a projection unit main body of the projector. In this, a CRT that emits red, green, and blue lights and a circuit that converts an input signal and supplies a predetermined signal to the CRT are included. Generally, an NTSC video signal and an analog RGB signal are often used as input signals. Very few have other types of input signal sources, and most do not generate their own. 204 is a screen. The screen material is often acrylic resin with surface coating or methacrylic resin. Either way, it is hard plastic. Reference numeral 205 denotes a reflector which reflects the light from the projection lens and guides it to the screen. Reference numeral 206 denotes a side surface exterior, which cuts out noise light from the outside. 207 is a speaker. 208 is the exterior of the front. Reference numeral 209 is the exterior of the back surface.

As described above, in the conventional rear projection type projector, the sides such as the side from the projection lens to the screen and the back are all covered with the exterior. In general, many rear projection type projectors have large screens and large screens, so at first glance it looks like a large CRT television. The size of the exterior increases with the size of the screen, and becomes considerably heavy. Therefore, it is difficult to move and it will be fixed and used in one place. The degree of freedom in design is low, and the interior quality is low. In any case, it will be used in the same way as a brown television.

[0006]

[Problems to be solved by the device]

 The present invention is intended to solve the above problems, and its purpose is to provide a TV that is superior in design as an interior decoration, easy to carry, and easy to assemble. It is to provide a rear projection type LCD projector with a different image.

[0007]

[Means for Solving the Problems]

 The liquid crystal projector of the present invention is characterized by the following three points.

Despite the rear projection type, it does not block the space between the projection lens and the screen. Since there is no exterior, there is great freedom in design. It is also lighter and easier to assemble.

Use frosted glass as the screen.

-It has a large number of input signal sources and displays the following three types of signals by switching the switches.

Image signal sources such as TV and VTR.

An internal signal generation source that generates colors such as red, blue, and green and various patterns.

A signal generation source that captures external environmental changes and changes the generated signals accordingly.

[0014]

EXAMPLE 1 A liquid crystal projector of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a liquid crystal projector of the present invention. 101 is a projection lens and 102 is a projection unit. A detailed configuration diagram of this portion is shown in FIG. 4, which includes a liquid crystal display panel, a light source, and the like. 103 is a screen. Here, frosted glass is used as the material for the screen. Frosted glass has a sense of mass and a sense of luxury in terms of design compared to hard plastic, which is a screen for general rear projection type projectors. However, the resolution is not so good and it is not suitable for TVs with the highest performance. Reference numeral 104 denotes a reflecting plate, which serves to reflect the light from the projection lens 101 and guide the light to the screen. Use a mirror or a plate with aluminum vapor-deposited on glass. A column 105 connects the projection unit and the screen. 106 is a clasp that connects the screen and the reflection plate.

The feature of the liquid crystal projector of the present invention compared to the conventional example is that there is nothing between the projection lens and the screen other than the support, and there is no equivalent to the exterior. Therefore, it is light and easy to carry, and has a high degree of freedom in design. For example, this design example gives people the impression that round frosted glass floats in the air. The projector that gives such an impression is unprecedented, and it gives the image of a rear-projection projector as a new type of display device different from that of a TV.

The exterior used in the conventional example is not used in the present invention. Originally, this was to cut the external light that becomes noise light on the screen. The screen of the liquid crystal projector of the present invention contains a lot of noise light, and it seems that the contrast is considerably lower than that of the conventional rear projection type projector. However, when we consider the direction of lighting in the room where LCD projectors are mainly used, we find it interesting. Almost no light is emitted from the floor in the room, and the light source is mainly the ceiling. Therefore, the light from the bottom is only the reflected light reflected by the floor and walls, and the amount of light is quite low. On the other hand, although the noise light from the top is quite strong, most of this component is cut off by the reflector in the LCD projector of the present invention. Especially in hotels, museums, exhibition halls, etc. where the projector is likely to be used often, the light from above is quite low. Furthermore, the reflected light is very small. Therefore, the deterioration of the contrast of the LCD projector of the present invention is not so noticeable.

Second Embodiment FIG. 3 shows another example of the present invention. FIG. 3 (A) shows an example of a ceiling suspension. 301 is the ceiling. In this case, the screen gives the impression that it is suspended from the ceiling by a single column. In FIG. 3 (B), the screen (103) feels as if it is floating above the wall (401). Both of these effects are due to the lack of an exterior. The projection lens and projection part are buried in the ceiling or wall. In this case, all the external light from the ceiling direction acts as noise light, so it is necessary to exercise caution when illuminating the ceiling.

FIG. 4 shows a configuration diagram of the projection unit. FIG. 4A shows an example using three liquid crystal display panels, and FIG. 4B shows an example using one liquid crystal display panel. FIG. 4A 401 shows a liquid crystal display panel. I'm using three. 402 is a dichroic mirror. This mirror has wavelength selectivity and separates and combines the colors red, green and blue. 403 is a total reflection mirror. 404 is a light source. See JP-A-60-2916 for detailed functions and functions.

In the example of (B), a color filter is built in the liquid crystal display panel. This simplifies the configuration, such as eliminating the need for dichroic mirrors. 101 is a projection lens, 401 is a liquid crystal display panel, 405 is a condenser lens, and a light source is 404. The projection unit may be one that uses three liquid crystal display panels (A) or one that is used (B).

FIG. 5 shows a block diagram of the circuit of the present invention. In this example, three liquid crystal panels are used. There are three types of input signals, which can be selected by switches (515, 516).

The input signal 501 is an NTSC video signal, which is the same as the conventional rear projection type projector. The second is input using a combination of knob and synthesizer. The knob changes the screen color and shape brightness on the screen. By inputting the information to the synthesizer, a signal corresponding to the knob pattern is created and output to the RGB output coder via the switch. The third input is the combination of sensor and synthesizer (504). Depending on its type, the sensor captures changes in the external environment such as temperature and humidity, pressure, and sound, and converts them into electrical signals. It is converted into an input signal to the RGB decoder with a synthesizer. The subsequent circuit configuration is the same as the conventional LCD projector. 505 is an RGB decoder. Here, the signal is divided into red, blue and green. Then, each RGB signal goes through the γ correction and goes from the driver to the liquid crystal display panel.

[0023]

[Effect of device]

 The liquid crystal projector of the present invention has molding freedom and functional freedom that conventional liquid crystal projectors do not have. In addition, it has features such as light weight and easy assembly.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional rear projection type liquid crystal projector.

FIG. 3 is a view showing another embodiment of the present invention.

FIG. 4 is a block diagram of the projection unit of the present invention.

FIG. 5 is a circuit block diagram of the present invention.

[Explanation of symbols]

 101-projection lens 102-projection unit 103-screen 104-reflector 105-column 106-clasp 201- ..Red light projection lens 202..green light projection lens 203..projection unit 204..screen 205..reflector 206..side exterior 207 ..・ ・ ・ Speaker 208 ・ ・ ・ ・ ・ Front exterior 209 ・ ・ ・ Rear exterior 301 ・ ・ ・ Ceiling 302 ・ ・ ・ Wall 401 ・ ・ ・ ・ ・ Liquid crystal display panel 402 ・ ・ ・ ・ ・ Dichroic Mirror 403 Total reflection plate 404 Light source 405 Condenser lens 501 Video input 502 Control knob 503 Sensor 50 4 ... Synthesizer 505 ... RGB decoder 506 ... R signal gamma correction 507 ... G signal gamma correction 508 ... B signal gamma correction 509 ...・ R signal driver 510 ・ ・ ・ G signal driver 511 ・ ・ ・ ・ ・ B signal driver 512, 513, 514 ・ ・ ・ Liquid crystal display panel

Claims (3)

[Scope of utility model registration request] 1. At least a transmissive liquid crystal panel for displaying figures, characters, images, etc., a light source for producing light for illuminating the liquid crystal display panel, and a projection lens for forming an image of the light transmitted through the liquid crystal display panel. And in a liquid crystal projector that has a screen placed at the position where light forms an image,
A liquid crystal projector including a liquid crystal projector, a member 102 for holding the same, a pillar 105 fixed to the member 102, a total reflection mirror 104 fixed to the pillar 105, and a screen fixed to the total reflection mirror 104. 2. The liquid crystal projector according to claim 1, wherein frosted glass is used as the screen. 3. It has a large number of input signal sources, and displays at least the following three types of signal sources by switching a switch. That is, an image signal source such as a TV or VTR. An internal signal source that generates various patterns such as red, blue, and green. A signal source that catches external environmental changes and changes the generated signal accordingly. The liquid crystal projector according to claim 1, which has such various input signal sources.