JPH04138418A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To allow the sufficient cooling of a liquid crystal panel without depending on the quantity of the light transmitted through the liquid crystal panel and to allow displaying of bright videos by putting cooling fluid and the liquid crystal into a transparent container, passing the cooling fluid into 1st and 2nd spacing parts and directly taking beat away from at least both surfaces of the liquid crystal panel. CONSTITUTION:The light from a high-voltage discharge lamp 1 disposed on the rear surface side of the container 6 is made incident on a reflector 2 or directly on the rear surface of the container 6 and thereafter, this light is passed in the fluid by a flow device 9 of the 1st spacing part 91. The light is thereafter made incident on the rear surface of the liquid crystal panel 5 and transmits the open part of many liquid crystal shutters 8 arranged vertically and horizontally so as to emerge to the front surface of the liquid crystal panel 5. In succession, the light flows through the fluid flowing in the 2nd spacing part 92 and emerges from the front face of the container 6; thereafter, the light is emitted from an output section directly or via an optical system, such as lens. The light is displayed directly or via a screen 15, etc. The extremely bright videos are obtd. without limiting the quantity of the light with which the liquid crystal panel is irradiated.

Description

[Detailed description of the invention] "Purpose of invention" (Industrial application field) The present invention relates to a liquid crystal display device using a liquid crystal panel.

(Prior Art) As a conventional device of this kind, there is, for example, a projection type device. This device has a high-pressure discharge lamp and a reflector on the back of the liquid crystal panel, and a lens on the front of the liquid crystal panel. A drive circuit is connected to the above liquid crystal panel,
It was constructed so that light from a high-pressure discharge lamp was transmitted through a liquid crystal panel, and a lens was used to project and enlarge the image displayed on the liquid crystal panel by a drive circuit.

According to this conventional device, the liquid crystal panel is destroyed by the heat of the high-pressure discharge lamp, making it impossible to display images.In order to solve this problem, an infrared cut filter (infrared reflection or Attempts were made to prevent the liquid crystal panel from becoming too hot by using filters), cooling one side of the liquid crystal panel with a fan, or placing a water cooling tube close to one side of the liquid crystal panel.

However, with either method, a sufficient cooling effect is still not obtained, resulting in the problem that the liquid crystal panel may malfunction.

On the other hand, when trying to obtain high light output, infrared rays increase with the output light, and the light itself becomes hotter, so there is a limit to the amount of light that can pass through the LCD panel, and therefore it is not possible to increase the amount of light that can pass through the LCD panel. However, there was a problem in that there was a limit to the brightness of the projected image.

(Problems to be Solved by the Invention) The present invention aims to eliminate the above problems and provide a liquid crystal display device that can sufficiently cool a liquid crystal panel and display bright images regardless of the amount of light passing through the liquid crystal panel. purpose.

[Structure of the Invention] (Structure for Solving the Problems) The liquid crystal display device of the present invention has a large number of liquid crystal shutters arranged vertically and horizontally, and has a power supply section at an end that supplies power to open and close each liquid crystal shutter. a liquid crystal panel, the liquid crystal panel is accommodated, and first and second gaps are respectively formed on the front and back surfaces of the liquid crystal panel, and at least the portions facing the front and back surfaces of the liquid crystal panel are translucent. a liquid crystal panel container; a distribution device for circulating low-temperature fluid through the gap; a high-pressure discharge lamp, for example, disposed on the back side of the container; and an output for outputting light emitted from the high-pressure discharge lamp through the liquid crystal panel. The device is characterized by comprising:

The present invention is applicable not only to the projection type device mentioned above as a conventional device, but also to devices in which the liquid crystal panel itself serves as an output section, that is, a display section, such as a home-use liquid crystal television.

(Function) The function of the liquid crystal display device of the present invention will be explained. First, the path of light will be explained. Light from a high-pressure discharge lamp placed on the back side of the container is incident on the reflector or directly on the back side of the container, and then passes through the fluid flowing through the flow device in the first gap.

Thereafter, the light enters the back side of the liquid crystal panel, passes through the open portions of the many liquid crystal shutters arranged vertically and horizontally on the liquid crystal panel, and exits to the front side of the liquid crystal panel.

Thereafter, the light passes through the fluid flowing through the second gap and exits from the front surface of the container, and then is emitted directly or through an optical system such as a lens, and then exits from the output section, either directly or through a screen, etc. Is displayed. Next, the heat path will be explained. The path of heat is similar to that of light, but it is partially absorbed by the fluid flowing in the first gap. moreover,
Some of it is also absorbed by the LCD panel. However, the heat absorbed by the liquid crystal panel is absorbed by the fluid flowing in front and behind the liquid crystal panel.

(Embodiment) FIG. 1 is a schematic diagram showing an embodiment of a liquid crystal display device according to the present invention. This is a projection type full color liquid crystal display device.

In FIG. 1, 1 is a high-pressure discharge lamp such as a metal halide lamp, and 2 is, for example, a reflector plate in which a heat-ray transmitting, light-reflecting multilayer interference deposited film is formed on one surface of a glass base material having a shape that encloses the high-pressure discharge lamp. 3 is a lens for condensing light as shown in the figure; 4 is a high-pressure discharge lamp lighting device; 5 is a liquid crystal panel; 6 is, for example, a transparent glass container (the broken line indicates the actual space in which the panel is accommodated); 12 7 is a flexible pipe, 8 is a cooler, 9 is a circulation type flow device, 10 is a filter, and 11 is a cooling liquid such as electrically insulating Fluorinert (in the figure, the arrow indicates the direction in which the liquid flows). It shows a liquid crystal drive device that has a liquid crystal video signal input section and opens and closes a liquid crystal shutter 8, which will be described later, in accordance with a video signal.
The above parts 1 to 6 are attached to the main body 13. Reference numeral 14 denotes a light projection port provided on the front surface of the main body 13 and serving as an output section. Note that 15 is a screen for projecting light.

2 to 4 are diagrams showing examples of a liquid crystal panel 5 and a container 6 of a liquid crystal display device. In FIG. 2, 15 is a spacer for forming first and second gap portions 91 and 92 between the liquid crystal panel 5 and the container 6 when the liquid crystal panel 5 is housed in the container 6; For example, a flexible wiring board is provided with connectors 16a and wiring 16b for supplying power to electrodes corresponding to a plurality of liquid crystal shutters 18, which will be described later, formed on the end face of the liquid crystal panel 5, and the connector 16a is connected to a video signal input device. The connected numeral 17 represents a liquid crystal panel display section. 18 is a liquid crystal shutter, and each liquid crystal shutter 18 has red, green, and blue color filters R, G, and B facing each liquid crystal shutter.
is formed by means such as printing.

FIG. 3 is a schematic view showing an example of the container 6 of the liquid crystal display device according to the present invention, and FIG. 4 shows an example of the liquid crystal panel 5.

The operation of this embodiment will be explained below.

Pour a cooling liquid such as Fluorinert, a transparent and electrically insulating inert liquid, into a transparent container, and secure the liquid crystal panel with a spacer to prevent it from touching the water cooling bath. is circulated to cool the LCD panel. The liquid crystal panel displays images by inputting a video signal to the drive circuit of the liquid crystal panel via a connector.

On the other hand, the light from the high-pressure discharge lamp passes through a transparent water cooling tank, a transparent cooling liquid, and a liquid crystal panel, and is enlarged and projected onto a screen by a lens to display an image.

In this embodiment, the spacer can have two functions: positioning (fixing) the liquid crystal panel in the water cooling tank and preventing the liquid crystal panel from touching the water cooling tank. Also,
The flow of coolant can wash away dirt, bubbles, etc. that adhere to the surface of the LCD panel. Furthermore, since Fluorinert was used as the fluid, even if the liquid crystal panel was immersed in the fluid,
Accidents such as short circuits with wiring boards will not occur.

Note that the light source may be a high-pressure discharge lamp, an ultra-high-pressure discharge lamp, or the like, as long as it outputs high-temperature heat as well as high light output.

Further, a plurality of injection ports and a plurality of discharge ports may be formed on almost the entire side surface of the container so that the flow inside the container is uniform on the surface of the liquid crystal panel.

Furthermore, by adjusting the flow rate and temperature of the cooling liquid, it is possible to provide extremely bright images without limiting the amount of light that illuminates the liquid crystal panel.

When using an infrared cut filter, as well as reducing heat, visible light is also reduced, in extreme cases by as much as 50%.
It is difficult to get a bright image. In the present invention, the cooling effect can be appropriately set by adjusting the flow rate and temperature of the cooling liquid, the loss of visible light is always constant, and a very high transmittance (approximately 80%) can be maintained. However, if an infrared cut filter that reduces heat to some extent is provided at a position facing the liquid crystal shutter, the flow rate of the coolant can be relatively slowed down or the temperature can be increased.

[Effects of the Invention] According to the present invention, a cooling fluid and a liquid crystal panel are placed in a transparent container, and the cooling fluid is passed through the first and second gaps to directly heat the liquid crystal panel from at least both sides. By removing the heat from the light source, the liquid crystal panel can be reliably protected from the heat of the light source, and the life of the liquid crystal panel can be extended.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is an overall schematic diagram, FIG. 2 is a perspective view of main parts, FIG. 3 is a front view of the container, and FIG. FIG. 2 is a perspective view of a main part of a liquid crystal panel. 1... Light source, 5... Liquid crystal panel, 6... Container, 9
. . . Distribution device, 14 . . . Output section, 91 . . . First gap portion, 92 . Patent applicant: Toshiba Lightic Co., Ltd. Agent
Patent attorney Yoshihiro Onoda

Claims (1)

[Claims] (1) A liquid crystal panel that has a large number of liquid crystal shutters arranged vertically and horizontally, and has a power supply section at the end that supplies power to open and close each liquid crystal shutter; a liquid crystal panel container having first and second gap parts respectively formed therein, and at least the portions facing the front and back sides of the liquid crystal panel are translucent; a low-temperature fluid is supplied to the first and second gap parts; A liquid crystal display device comprising: a distribution device for distributing; a light source disposed on the back side of the container; and an output section for outputting light emitted from the light source through the liquid crystal panel.