JPH02267535A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To freely change the direction of a liquid crystal projector or the projecting part of a liquid crystal display device such as a direct viewing liquid crystal TV by allowing light from a light source to irradiate the liquid crystal display through an optical fiber guide having flexible structure. CONSTITUTION:When a lamp 13 is turned on by a signal and electric power source part 20, the light is made incident on an optical fiber 17 in a light guide 16 together with light reflected on a reflecting mirror 18 through a heat ray filter 14 and a condensing lens 15. The light emitted from an emitting end is converted to the collimated beam of light by a condenser lens 30 in a projector 29 and it irradiates a liquid crystal panel 31 from the back. On the panel 31, a prescribed image is formed by receiving an image signal with the aid of a signal conductor 27 from the power source part 20. Therefore, the image can be projected in a free direction by a projecting lens 32. The projector 29 is supported at the tip part of a flexible tube 16 and an optical axis is easily made at a right angle with a projecting screen. Then, the distortion of the image can be prevented from occurring.

Description

[Detailed description of the invention]

FIELD OF THE INVENTION The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device suitable for use as a liquid crystal projector. Summary of the Invention: A flexible light guide section containing an optical fiber is interposed between a liquid crystal panel, a light source lamp, and a liquid crystal panel drive system, and a projection lens system is provided in front of the liquid crystal panel. The present invention relates to a liquid crystal display device which can freely project images in any direction by providing a screen and can easily project images onto various places such as a ceiling, a wall, or a desk. [Prior Art] A conventional projector using a liquid crystal panel has a structure as shown in FIG. 9, which includes a cabinet 1 in the shape of a rectangular parallelepiped, and an optical system 2 attached to the front side of the cabinet 1. ing. Such a projector is a front type projector, and projects light onto the screen 3 from in front of the screen 3 to form an image on the screen. In particular, front-type projectors are very convenient because they can freely change the size of the screen on the screen 3 by changing the distance between the screen 3 and the projector 1.

Problem to be solved by the invention
It was necessary to support it upward. That is, the conventional projector has a problem in that the structure supporting the main body is exaggerated and it is difficult to actually install it. Furthermore, as shown in FIG. 11, if the projector 1 is placed on a mounting table 6 whose top surface is slanted in order to project onto a screen 3 attached to a wall 7, the optical axis of the projector 1 will be Because of the tilt angle, there is a problem in that image distortion 8 occurs on the screen 3 as shown in FIG. That is, when projected from diagonally below, an inverted trapezoidal distortion 8 will occur. The present invention has been made in view of these problems, and provides a liquid crystal display device in which the projection unit is lightweight and can be freely changed in direction, allowing easy projection to any location. The purpose is to provide the following. Means for Solving the Problems] The present invention provides an optical fiber guide with a flexible structure;
It has a light source disposed at one end of the optical fiber guide and a liquid crystal display disposed at the other end of the optical fiber guide, and the light from the light source is passed through the optical fiber in the optical fiber guide and displayed on the liquid crystal display. It is designed to illuminate the display. K Effect 1 Therefore, by deforming the flexible optical fiber guide section, it becomes possible to freely change the orientation of the display section provided with the liquid crystal display.

【Example】

1 and 2 show a liquid crystal projector according to an embodiment of the present invention, and this projector includes a base 11. As shown in FIG. The base 11 has a rectangular parallelepiped-shaped cabinet 12, and a high-intensity lamp 13 is housed within the cabinet 12. Note that the lamp 13 may be composed of a metal halide lamp or a halogen lamp. The lamp 13 is disposed within a reflecting mirror 18 having a parabolic cross section, and a heat ray filter 14 is attached in front of the lamp 13. A condensing lens 15 is further provided in front of the heat ray filter 14 to allow light to enter the input end of the optical fiber 17 within the light guide 16. A ballast 19 is further arranged within the cabinet 12. The ballast 19 is for stabilizing the power supply to the lamp 13. Note that if the lamp 13 is composed of a halogen light source, the ballast 19 can be omitted. Furthermore, a signal/power supply section 20 is provided within the cabinet 12, and is driven by an external commercial power source. Further, a cooling fan 21 is provided on the right end side of the cabinet 12, and is driven by a motor 22. The fan 21 faces the slit 23, thereby discharging the heated air to the outside of the cabinet 12. Light guide 16 holding optical fiber 17 inside
is made of a flexible tube made of stainless steel, for example. The base end side of the light guide 16 is fixed to the opening 26 on the top surface of the cabinet 12 via the support cylinder 25. Also light guide 16
A signal line 27 is inserted therein. A light projecting section 29 is supported on the tip side of the light guide 16 via a connection 1128. Condenser lenses 30 are arranged within the light projecting section 29, and a liquid crystal panel 31 is attached to the front side of these lenses 30. Note that the liquid crystal panel 31 receives signals via the signal angle line 27.
It is connected to the video circuit section in the power supply section 2o. Further, a projection lens 32 is disposed in front of the liquid crystal panel 31, and is supported by an m-tube 33, and the lens barrel 33 is supported by the front end of the light projecting section 29 via an adapter sleeve 34. ing. In the above configuration, when the lamp 13 is turned on by the signal/power supply unit 20, the light from the lamp 13 is reflected upward by the reflection 118, and passes through the heat filter 14 and the condensing lens 15 to the light guide 16. The light is input into the optical fiber 17 inside. The heat ray filter 14 absorbs the heat rays of the light from the light source 13 and prevents them from entering the optical fiber 17. optical fiber 1
The light emitted from the output end through the light emitting section 29
The condenser lens 30 inside converts the light into parallel light, and the liquid crystal panel 31 is illuminated from the back side. An image signal is sent to the liquid crystal panel 31 from the signal/power supply section 20 via a signal line 27, and a predetermined image is thereby formed. Therefore, an image is formed by illuminating such a liquid crystal panel 31 from the back side. This image is projected onto a screen 36 by the projection lens 32, as shown in FIG. At this time, the inside of the cabinet 12 is cooled by a fan 21 driven by a motor 22. According to such a liquid crystal projector, the light projecting section 29 is supported by the tip of the flexible light guide 16, and can be freely bent in accordance with the direction of the projection screen 36. Therefore, in addition to projection as shown in FIG. 3, an image can be projected onto the ceiling 37 as shown in FIG. 4. Alternatively, an image can be projected onto the top surface of the desk 38 as shown in FIG. Furthermore, as shown in FIG. 6, an image can be projected from diagonally below onto a projection plate 41 that is mounted diagonally downward by a stand arm 40. Therefore, in this case, the user can view the image projected on the projection plate 41 while lying down. Then, by rotating the lens barrel 33 and adjusting the focus according to the distance from the light projecting section 29 to the projection surface such as the screen 36, a clear image can be projected to an arbitrary position. In addition, the light projecting section 29 is connected to the flexible tube 16.
The projection screen 36
Since the optical axis of the light projecting section 29 can be made perpendicular to the image forming apparatus, it is also possible to prevent the occurrence of image distortion as in the conventional case. Furthermore, according to the liquid crystal projector using such a liquid crystal panel 31, the light projection part 29 and the main body part 11 are separated, and the two are connected by the flexible light guide 16. This brings about the advantage that the space for installing the main body part 11 is reduced. Further, the base portion 11 constituting the main body portion can be incorporated into a wall, a desk, etc., and thereby only the light projecting portion 29 can be exposed to the outside. Therefore, only the light projecting section 29 and the light guide section 16 are exposed, making it possible to provide a projector with a very neat shape. Furthermore, in such a projector, the liquid crystal panel 31, which is sensitive to heat, can be sufficiently protected. In other words, the liquid crystal panel 31 displays light i! ! Since the panel 31 is far away from the light [13], deterioration of the panel 31 due to heat from the light [13] is prevented. Furthermore, since the light is guided into the optical fiber 17 through the heat ray filter 14, the heat rays will not reach the panel 31, and the panel 31 will be more securely protected. Further, in such a liquid crystal projector, since the distance between the ballast 19 and the high-intensity lamp 13 is extremely short, countermeasures against high-voltage pulses generated between the ballast 19 and the lamp 13 can be easily taken. Further, such a liquid crystal projector can be used as a direct-view TV as shown in FIG. 7 by removing the projection lens 32 on the front side of the liquid crystal panel 31. When the lens 32 attached to the front end of the light projecting section 29 via the adapter sleeve 34 is removed together with the adapter 34, the liquid crystal panel 31 is directly exposed to the front side of the light projecting section 29. Therefore, the image on the panel 31 can be viewed directly, and can be used as a direct-view liquid crystal TV. Note that in this case, since the lens 32 is not present, it is necessary to invert the image. Therefore, an inverted signal is supplied to the liquid crystal panel 31 automatically in conjunction with the removal of the lens 32 or by switching the operation button. Note that the liquid crystal panel 31 is a single panel type or R, G,
It may be any of the three temporary formulas of B. Furthermore, instead of displaying images using this projector, by displaying a single color on the liquid crystal panel 31, it can also be used as a lighting means.

Application Example 1 Although the present invention has been described above with reference to the illustrated embodiment, the present invention is not limited to the above embodiment, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, the light guide 1 supporting the projection section 29
6 was designed to protrude above the cabinet 12, but as shown in the modified example shown in FIG.
The light guide 16 may be made to protrude from the front end side. In this case, a handle 43 can be provided on the cabinet 12, thereby making it possible to provide a liquid crystal projector that is easy to carry. Effects of the Invention As described above, the present invention has a light source disposed at one end of an optical fiber guide having a flexible structure, and a liquid crystal display disposed at the other end, and the light from the light source is transmitted to the light inside the optical fiber guide. It is designed to irradiate a liquid crystal display through a fiber. Therefore, according to such a structure, it is possible to provide a liquid crystal display device in which the projection unit is light and can be freely changed in direction and can be used as a liquid crystal projector or a direct-view liquid crystal TV.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a liquid crystal projector according to an embodiment of the present invention, FIG. 2 is a perspective view of the same external appearance, FIG. 3 is a perspective view of main parts showing a state of projection onto a wall, and FIG. 4 is a ceiling 5 is a perspective view of the main part showing the state of projection onto a desk; FIG. 6 is a side view showing the state of projection that can be viewed while lying down. Fig. 7 is a perspective view of the main parts of a direct-view TV receiver, Fig. 8 is an external perspective view of a modified projector, Fig. 9 is a perspective view of a conventional liquid crystal projector in use, and Fig. 10 is FIG. 11 is a perspective view of the screen projected onto the ceiling, FIG. 11 is a side view of the screen projected onto the wall, and FIG. 12 is a front view showing image distortion on the screen. The names of the main parts in the drawings are as follows. 11... 12... 13... 14... 16... 17... ・Base, cabinet, ^brightness lamp, heat ray filter, light guide, optical fiber 29...・Light emitter 31 ...Liquid crystal panel 32...Projection lens

Claims (1)

[Claims] 1. The optical fiber guide has a flexible structure, a light source disposed at one end of the optical fiber guide, and a liquid crystal display disposed at the other end of the optical fiber guide. A liquid crystal display device characterized in that the liquid crystal display is irradiated with light through an optical fiber within a fiber guide.