JPH02235089A - Liquid crystal projector - Google Patents

Abstract

PURPOSE:To display two images in parallel with simple constitution by sharing a light source and providing one couple of a liquid crystal element and an optical system each on a right and a left side, and displaying the two images side by side on a screen. CONSTITUTION:The irradiation light from the common light source 1 becomes coherent luminous flux by passing through a couple of left and right collimator lenses 2a and 2b and the coherent luminous flux is transmitted through a couple of left and right liquid crystal elements 3a and 3b which are controlled according to image information to become image light, which is projected on the screen 6 through couples of left and right lenses 4a and 4b for diffusion and reflecting mirrors 5a and 5b. Consequently, the two images 8a and 8b are displayed on the screen 6 in parallel by the simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal projector that uses a liquid crystal display device to simultaneously display two screens.

[Prior Art 1 A display device is used to display output information from an information processing device such as a computer based on an output signal from the information processing device, and a typical display device is a CRT. be.

For example, at a polling field, image recognition means is used to detect the number of bottles remaining after pitching, and based on this detection result, points are automatically counted and displayed on the image display means. Automatic score recording devices are increasingly being used. Here, a CRT is used as a display device for displaying the counted scores.

The displayed score needs to be visible not only to the player actually playing the game, but also to fellow players in the waiting seats, as well as spectators and the like. For this purpose, a CRT serving as a display device is installed in front of and above the pilot in each lane so as to be suspended from the ceiling or the like.

As is well known, in polling competitions, scores are recorded sequentially from frame 1 to frame 10, and in order to display the scores in all these frames, that is, the entire score table, it is necessary to use a display device. teeth,
A wide display width is required. However, the display width of a CRT is limited, and a CRT with a large screen with a wide display width is naturally expensive, and the display device is also heavy, making it difficult to hang it from the ceiling. This means that a simple installation method cannot be used. Also,
It may be possible to make display elements such as letters and symbols smaller, but if this is done, it will be extremely difficult to visually recognize the display from a distance. Therefore, conventionally, the entire score table was not displayed on the screen at once, but only the minimum necessary amount, such as three frames, was displayed.

In addition, classes and lectures can be held in classrooms and lecture halls. Generally, a blackboard is used to display the contents of lectures and other information, or a display device may be used instead of the blackboard to reduce the burden on the person conducting the class or lecture, and to increase the richness and accuracy of the displayed content. In some cases, it may be desirable to provide an indication. However, if a small screen such as a CRT is used, it is extremely difficult to visually check the information from a distance from the CRT. It was virtually impossible to conduct classes, lectures, lectures, etc. using CRTs.

[Problems to be Solved by the Invention] Therefore, when using a display device at the polling field, classroom, lecture venue, etc. mentioned above, it is necessary to use one with a large screen.

Here, as a type of display device, there is a back-illuminated liquid crystal projector. This projector uses a liquid crystal display device, irradiates illumination light from the back of the liquid crystal display device, and enlarges the image formed by passing through the liquid crystal display device and displays it on a screen. It is designed to be able to be projected,
By increasing the magnification of this lens system,
Display contents can be expanded to a large screen. Moreover, in polling alleys, the wall above the pit and lane, and in classroom lecture halls, the wall behind the lecturer can be used as a screen.

By the way, in polling alleys, there are usually two lanes in pairs, and the pit is shared by both lanes, so it is necessary to display the scores of both lanes at the same time. For this purpose, it is preferable to be able to display two screens at the same time. In addition, in classrooms, etc., in order to utilize the wall behind the podium as widely as possible, it is preferable to make the width of the screen extremely large compared to the height of the screen. As in the polling field described above, by displaying two screens in succession, it is possible to increase the size of the screen in the width direction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal projector that can display two screens in parallel using a single device having a simple configuration.

{Means for Achieving the Objects] In order to achieve the above-mentioned objects, the present invention provides a liquid crystal display device that is irradiated with illumination light from the back side, and a lens system that diffuses the flux of transmitted light from the liquid crystal display device. , a reflecting mirror disposed in the middle of the optical path of this transmitted light, and a screen for projecting the reflected image from the reflecting mirror, and these liquid crystal display devices, lens systems, and reflecting mirrors are arranged on the left and right sides. In addition to providing a pair of liquid crystal display elements, a single light source lamp is placed between both liquid crystal display elements.
Its feature is that two screens are displayed side by side.

[Operation 1] By configuring as described above, two screens can be displayed simultaneously on the same plane using a single projector.

For example, if two screens need to be displayed at the same time, such as two adjacent lanes in a bowling field,
The image may be displayed on both screens with a predetermined distance between them. In this case, the projector is built into a waiting seat or return rack in the bit area that is shared by both lanes, and the projector is illuminated diagonally upward to the wall from the projector installation section. Lane scores can now be displayed. If the magnification of the image by the lens system is set appropriately, not only the competitors, but also fellow competitors in the waiting seats, and even spectators can visually check the overall score of the game. The displayed contents can be enlarged and displayed.

In addition, in classrooms, etc., point towards the wall behind the podium.
By displaying two screens consecutively,
Make full use of this wall surface to write large letters. It becomes possible to display a large amount of display contents consisting of symbols, figures, etc., and the amount of information that can be displayed at one time increases significantly.

[Embodiment 1] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, FIG. 1 shows the overall configuration of a liquid crystal projector.

In the figure, 1 indicates a light source lamp, and the light source lamp 1
Collimator lenses 2a, 2 for collimating the illumination light from the light source lamp 1 into parallel light are disposed on the left and right sides of the light source lamp 1.
b is installed. And these lenses 2a, 2
In the middle of the optical path from b, there are liquid crystal display devices 3a, 3
b is installed. Each liquid crystal display device 3a, :lb
By activating the , characters, symbols, figures, etc. can be displayed.

The liquid crystal display devices 3a and 3b can display display contents by irradiating illumination light from the back side thereof.

In the middle of the optical path of the transmitted light from the liquid crystal display devices 3a and 3b, there are lenses 4a and 4a for enlarging and projecting the transmitted light.
4b is installed. And these lenses 4a, 4
Reflecting mirrors 5a and 5b are installed on the optical axis of b. The reflecting mirrors 5a and 5b are used to bend the optical path by approximately 90'', so that the transmitted light from the left and right liquid crystal display devices 3a and 3b travel in parallel and are arranged on the screen 6. state, display screen 6a, 6
It will be displayed as b.

The liquid crystal projector configured in this way is installed, for example, in the waiting seats, return racks, etc. of each bit in a bowling field, and the liquid crystal display devices 3a and 3b are used to display the number of pins remaining after pitching in adjacent lanes. It is connected to a score counting mechanism consisting of an image processing means for recognition and a counting means for counting points based on a signal from this image processing means, and the liquid crystal display devices 3a, 3b are displayed based on the signal from this counting mechanism. It is designed to drive and display its score. As shown in FIG. 2, the light emitted from this liquid crystal projector is irradiated onto a nearly vertical or curved wall located above between the bit and the lane.
This wall portion can be used as a screen 6, and a score table is projected on display screens 6a and 6b of this screen 6.

Here, since the wall section mentioned above has a large space, even if you display the entire score sheet for several people, you will be able to obtain a wide screen, and the position where the competition will be held and the waiting seats will be The text should be large enough to allow the entire score to be easily seen from the audience seats, etc., which are far from the screen. It can be displayed as a symbol.

Moreover, since this liquid crystal projector uses a single light source lamp 1 to simultaneously display two screens, its structure is simplified and power consumption can be saved.

The liquid crystal projector having the above-mentioned configuration can be applied not only to displaying scores at a polling field, but also to projects where it is necessary to display two screens at the same time.

For example, it can also be used as a display device for progressing a class, lecture, lecture, etc. in a classroom or lecture hall, etc., while displaying the content of the class, lecture, lecture, etc. on the podium or the wall behind the podium.

Since the width of the wall behind the lectern or podium is significantly larger than its height, the angles of the reflecting mirrors 5a and Sb in the liquid crystal projector are adjusted so that the reflecting mirror 5a
, 5b, the two screens projected on the wall are displayed in succession, as shown in FIG. This makes it possible to make use of a large wall space, and it becomes possible to enlarge the displayed content to the extent that all the people taking the lecture can see it.

[Effects of the Invention] As explained above, the present invention provides a pair of left and right liquid crystal display devices, lens systems, and reflecting mirrors, and a single light source lamp is disposed between both liquid crystal display elements. Since two screens are displayed side by side on the screen, with a simple configuration, it is possible to display two screens at the same time with a predetermined distance from each other or in a continuous state with low power consumption. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory diagram showing the overall structure of a liquid crystal projector, and FIGS. 2 and 3 are explanatory diagrams of the operation in different usages. 1: Light source lamp, 3a, 3b: Liquid crystal display device, 4a
, 4b: Lens, 5a, 5b: Reflector, 6: Screen, 6a, 6b: Screen Fig. 2, Fig. 3

Claims (1)

[Claims] a liquid crystal display device that is irradiated with illumination light from the back side; a lens system that diffuses a flux of transmitted light from the liquid crystal display device;
It has a reflecting mirror arranged in the middle of the optical path of this transmitted light, and a screen that projects the reflected image from the reflecting mirror, and a pair of left and right liquid crystal display devices, lens systems, and reflecting mirrors are provided, and both liquid crystal display elements A liquid crystal projector characterized in that one light source lamp is disposed between the two screens so that two screens are displayed side by side.