GB2351569A

GB2351569A - LCD projector

Info

Publication number: GB2351569A
Application number: GB9915249A
Authority: GB
Inventors: Hilbert Chen
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-06-25
Filing date: 1999-07-01
Publication date: 2001-01-03
Also published as: DE29911120U1; GB9915249D0

Abstract

A quasi liquid crystal / data projector, having a concave focusing reflector 2, a lamp 3 at the focusing point of the reflector, a condenser 4 and a Fresnel 5, a slot 11, two reflectors 6,6 on the inner side surface of the housing and a projection lens 7 is installed above the condenser. A movable liquid crystal display 3 with projecting function is arranged within the slot, where the liquid crystal display is connected to a computer so that the light of the lamp passes through the condenser and Fresnel lens. Thus, the light will pass through a liquid crystal and the image be reflected by the two reflectors, and projected through the projection lens 7 so that the liquid crystal display is projected to a image screen. Alternatively, reflectors 6,6 may be spaced and parallel to each other and lens 7 is at opposite end to the housing from lamp 3.

Description

2351569 A QUASI LIQUID CRYSTAL /DATA PROJECTOR

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to quasi liquid crystal /data projector, especially to a liquid crystal display with the function of image projection is detachable installed at a projector so that it can be projected to a large screen, thus, it present a visual effect of a large screen.

Description of the Prior Art

A general multimedia electronic products serve to satisfy the visual and hearing senses of peoples. In visual sense, the color and resolution of a display and the size of a screen are important factor. Recently, the sizes of TVs and computers are more and more increased. If the size of a screen is large enough to 300 inches, this can not be achieved by a general display. For example, in general the large size display of a computer is 21 inches. However, this volume is too large. The liquid crystal display used in portable computers only has a size of 15 inches, but this size is not sufficient in many applications, such as reporting, training, teaching, etc. If it is desired to have a large image, a projecting theory is used.

In general, there are two kinds of products by which computer to attain a large screen, one is liquid crystal display, i. e. a single channel projector, the other is a portable computer with projecting function.

The liquid crystal display is a projector with inner LCI)s and electronic device for driving a LCD, the defects of a LCD are:

a. Expensive in cost b. Poor illumination c. A further computer is required d. A conventional transparency film can not be used.

I Therefore, other than being expensive and thus not prevailed, the prior art have still defects in use.

For 4 portable computer with the function of projection, the back plate of a liquid crystal display is detachable and the liquid crystal display can be taken down from the portable computer, while the back plate on the liquid crystal display can be detached so that the liquid crystal display serves as a projecting slice and is put on a over-head projector, and then it is further connected to a portable computer and a liquid crystal display. Therefore, by the over-head projector, an image can be projected to a projecting screen.

The advantage is that the computer has dual usage and thus a multimedia large screen is attainable and is cheap. Moreover, the over-head projector is popular and accepted by customers.

While the defect of this design is that the over-head projector is heavy and not easy to be carried. Besides, the over-head projector uses a halogen lamp with lower illumination. Thus, it must be in a dark environment for a preferred quality.

SUMMARY OF THE INVENTION

Accordingly, the object of the present invention is to provide a quasi liquid / data projector, wherein a concave focusing reflector is installed at the inner side in the lower side of the housing. A lamp is installed at the focusing point. a condenser and a Fresnel lens is installed in front of the lamp. A slot formed in front of the Fresnel lens, moreover, another side of the housing installed at two L shape reflectors in the inner surface thereof. A projection Lens is installed above the housing, and a liquid crystal display with projecting function is arranged within the slot. The liquid crystal display is connected to a computer so that the light source of the lamp passes through the condenser and Fresnel lens. Thus, the light will pass through a liquid crystal display having projecting function, then, through two reflectors, the image will be projected upwards and then reflected and projected. Thus, image will pass 2 through the projection lens above the housing so that the liquid crystal display may be projected to the image screen.

The present invention will be better understood and its numerous objects and advantages will become apparent to those skilled in the art by referencing to the 5 following drawings in which:

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a cross sectional view showing the embodiment of the present invention.

Fig. 3 is an assembled cross sectional view (1) of another embodiment in the present invention.

Fig. 4 is an assembled cross sectional view (2) of another embodiment in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

At first, with reference to Figs. 1, and 2, in the present invention, a concave focusing reflector 2 is installed at the inner side in the lower side of the housing 1. A lamp 3 is installed at the focusing point. A condenser 4 and a Fresnel Lens 5 are installed in front of the lamp 3. A slot 11 is installed formed in front of the Fresnel Lens 5. Moreover, another side of the housing 1 is installed at the two reflectors 6 0 and 6' in the inner surface thereof. A projection Lens 7 is installed above the housing 1. A liquid crystal display 8 with projecting function is arranged within the slot 11. The liquid crystal display 8 is connected to a computer so that the light source of the lam 3 passes through the condenser 4 and Fresnel Lens 5. Thus, the p 0 light will pass through a liquid crystal display 8 with projecting function. Then, 0 CP through two reflector, the image will be projected upwards and then reflected and 0 3 projected further. Thus, image will pass through the projection lens 7 above the housing 1 so that the liquid crystal display 8 may be prejected to the image screen.

According to aforementioned construction, the liquid crystal display 8 with projecting function is detached from a portable computer, and is connected by connecting lines, and then the liquid crystal display 8 is inserted into the slot 11 of the housing 1 as shown in Fig. 2. Then, power is applied, and thus, the light source connected to the lamp 3 of the housing 1 will pass through the condenser 4 and the Fresnel Lens 5 so that the light will be uniformly projected to the liquid crystal display 8, and further light will pass through the liquid crystal display 8, then through two reflectors 6 and 6' so that the image will be projected upwards and reflected, so that the image will pass through the projection lens 7 for being amplified, and then projected to a projecting screen (not shown) so that a visual effect of a large screen is obtained. Moreover, this is economic to users.

Since the area and the size of the liquid crystal display 8 is larger than that of a prior art design, thus it will has a larger image resolution after being amplified, thus a higher quality is obtained.

Alternatively, since the projecting image is reflected by two L shape reflectors Zn 6 and 6', thus the image path will cause an upward reflection. A larger machine size 0 due to a direct projection with a long path is prevented. Therefore, the whole volume is minimized.

Moreover, the slot 11 for arranging the liquid crystal display may be installed at the left or right side other than being installed at the upper side. This is another t> 0 embodiment of the present invention.

Referring to Fig. 3', the concave focusing reflector 2 of the housing 1, lamp 3, and condenser 4 may be installed at a sliding housing 12. The sliding housing 12 is installed at one end of the first housing 1. While another end of housing 1 is formed 4 with an inverse L shape housing 13. The inner side thereof is installed with reflectors 6 and 6'. In using, the sliding housing 12 will be pulled out, and the 0 inverse L shape housing 13 will be opened, so that the liquid crystal display 8 is inserted into the slot 11 of the housing 1, thus, the image of the liquid crystal display 8 will be project to the imge screen so as to have a visual effect of a large screen. Inversely, when it is not used, the sliding housing 12 can be pushed to the housing 1, and the inverse L shape housing 13 covers the housing 1 so that the volume is reduced for being stored.

With reference to Fig. 4, in another embodiment of the present invention, inner surface of another end of the housing 1 has two reflectors 6 and 6' may be oppositely arranged in parallel and the projection Lens 7 is installed at the rear end of the housing 1. Then, it is projected from the housing 1 and the slot 11 of the liquid crystal display 8 is installed at the upper end of the hard disk fixing plate 1.

Therefore, the liquid crystal display 8 will be installed from the upper end of the housing 1.

Although the present invention has been described using specified 0 embodiment, the examples are meant to be illustrative and not restrictive. It is clear that many other variations would be possible without departing from the basic approach, demonstrated in the present invention.

Claims

What is Claimed is:

1. A quasi liquid / data projector, wherein a concave focusing reflector is installed at the inner side of the lower side of the housing, a la mp is installed at the focusing point, a condenser and a Fresnel lens are installed in front of the lamp, a slot is formed in front of the Fresnel lens, another side of the housing installed with two L shape reflectors are in the inner surface thereof, a projection Lens is installed above the housing, a liquid crystal display with projecting function is arranged within the slot, and the liquid crystal display is connected to a computer so that the light of the lamp passes through the condenser and Fresnel lens, thus, the light will pass through a liquid crystal display having projecting function, then, through the two reflectors, the image will be projected upwards and then reflected and projected again, as a result, the image will pass through the projection lens above the housing so that the liquid crystal display is projected to the image screen.

2. The quasi liquid crystal / data projector as claimed in claim 1, wherein the two reflectors at inner surface of the housing are oppositely arranged in parallel, and the projection lens is installed at the upper end of the housing, thus an image is projected from the front end of the housing.

3. A quasi liquid crystal /data projector substantially as herein described and with reference to the accompanying drawings.

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