JP2531928Y2 - LCD projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid crystal projector device that projects a display image of a liquid crystal display panel on a screen.

[Conventional technology]

Conventionally, a liquid crystal projector using a transmissive liquid crystal display panel has a configuration as shown in FIG. In FIG. 1, reference numeral 1 denotes a liquid crystal display panel, and a condenser lens 2 is disposed on the incident surface side of the liquid crystal display panel 1. The condenser lens 2 corrects the light from the light source device 3 into parallel light, and the parallel light emitted from the condenser lens 2 enters the liquid crystal display panel 1 and transmits through the liquid crystal display panel 1 to the projection lens 4. It is designed to be incident. The projection lens 4 corrects image light (parallel light) from the liquid crystal display panel 1 into converged light. The image light emitted from the projection lens 4 is enlarged and projected on a screen 5. The light source device 3 includes a light source lamp 6
Lamp light (radiation light) emitted from the light source lamp 6 is reflected by an elliptical reflection surface 7a of the reflector 7.
, And the reflected lamp light is condensed at the focal point position of the reflector 7. Therefore, this liquid crystal projector device is configured such that the lamp light emitted from the light source lamp 6 is condensed by the reflector 7, and the condensed lamp light is corrected into parallel light by the condenser lens 2 and is incident on the liquid crystal display panel 1. I have.

[Problems to be solved by the invention]

By the way, since the lamp light emitted from the light source lamp 6 of such a liquid crystal projector has a light distribution of about 140 ° on one side, not all of the lamp light emitted from the light source lamp 6 is reflected by the reflector 7. Some of the lamp light is emitted as it is without being reflected by the reflector 7.
For this reason, the conventional liquid crystal projector device uses the light source lamp 6.
Therefore, all the lamp lights emitted from the light source cannot be focused on one point, and the lamp light from the light source lamp 6 cannot be efficiently incident on the liquid crystal display panel 1.

When a discharge lamp is used as the light source lamp 6, the discharge lamp may explode due to the life of the lamp or the like, and there is a problem that glass pieces or metal pieces of the discharge lamp scatter.

The present invention has been made in view of such problems.
An object of the present invention is to provide a light source device for a liquid crystal projector that can increase the efficiency of incidence of lamp light incident on a liquid crystal display panel and can project a high-brightness projected image on a screen.

[Means for solving the problem]

In order to achieve the above object, a liquid crystal projector device according to the present invention comprises a light source lamp, a reflector for reflecting lamp light emitted from the light source lamp, and a reflection surface of the reflector arranged close to a front opening of the reflector. A condenser for condensing the light not incident on the reflector at substantially the same position as the light incident on the reflection surface of the reflector, and a condenser for causing the lamp light reflected by the reflector and the condenser prism to enter a liquid crystal display panel A lens and a projection lens for projecting lamp light transmitted through the liquid crystal display panel onto a screen.

[Action]

In the present invention, all the lamp light emitted from the light source lamp is condensed to one point by disposing a condenser prism having a focal position substantially at the same position as the focal position of the reflector in close proximity to the front opening of the reflector. Can be. Therefore, almost all the lamp light emitted from the light source lamp can be collected by the reflector and the condensing prism and can be incident on the liquid crystal display panel, so that the incident efficiency of the lamp light incident on the liquid crystal display panel can be increased. The collected light is made incident on the condenser lens, so that the light can be directed in a predetermined direction, whereby a high-brightness projected image can be projected on the screen. In addition, since the condenser prism is located in front of the reflector, even if the light source lamp explodes due to lamp life, etc., the condenser prism functions as an explosion-proof glass to prevent scattering of glass pieces and metal pieces. Can be.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, and shows a schematic configuration of a liquid crystal projector device. In the figure,
Reference numeral 11 denotes a liquid crystal display panel, and a condenser lens 12 is arranged on the incident surface side of the liquid crystal display panel 11. The condenser lens 12 corrects the light from the light source device 13 into parallel light, and the parallel light emitted from the condenser lens 12 enters the liquid crystal display panel 11, passes through the liquid crystal display panel 11, and enters the projection lens 14. It is supposed to. The projection lens 14 emits image light (parallel light) from the liquid crystal display panel 11
Is corrected to a converged light, and the image light emitted from the projection lens 14 is enlarged and projected on a screen 15.

The light source device 13 is composed of a light source lamp 16 and a reflector 17, and lamp light (radiation light) emitted from the light source lamp 16 is reflected by an elliptical reflection surface 17a of the reflector 17 and condensed at a focal position. I have. In addition, a condenser prism 18 is provided between the light source device 3 and the condenser lens 2.
It is located close to 17 front openings. The condenser prism 18 has a focal point substantially at the same position as the reflector 17, and a total reflection surface 18a is formed on an extension of the elliptical reflection surface 17a of the reflector 17 extending toward the liquid crystal display panel.

According to such a configuration, of the lamp light emitted from the light source lamp 16, the lamp light reflected by the reflector 17 passes through the condenser prism 18 and is collected at the focal position of the reflector 17. Further, the lamp light not reflected by the reflector 17 is reflected by the total reflection surface 18a of the condenser prism 18, and is condensed at the focal position of the condenser prism 18. Here, the condenser prism 18
Is located at the same position as the focal position of the reflector 17, so that the lamp light reflected by the reflector 17 and the reflector 17
The lamp light not reflected by the reflector 17 can be condensed at one point, and the lamp light not reflected by the reflector 17 can be made incident on the liquid crystal display panel 11. This makes it possible to increase the incidence efficiency of the lamp light incident on the liquid crystal display panel 11, and to project a high-luminance projection image on the screen 15. Further, in this embodiment, since the condenser prism 18 is disposed in front of the reflector 17, even if the light source lamp 16 explodes due to the life of the lamp or the like, the condenser prism 18 is not used.
Can serve as an explosion-proof glass and prevent scattering of glass pieces and metal pieces.

Next, a second embodiment of the present invention is shown in FIG. In the second embodiment, the exit surface 18b of the condenser prism 18 has a concave lens surface, and has the same configuration as that of the first embodiment except for the above points. By making the exit surface 18b of the condenser prism 18 a concave lens surface in this way, the focal position of the lamp light can be moved far away, and the spread angle θ of the lamp light passing through the focal position can be reduced. Therefore, the lamp light can be made incident on the liquid crystal display panel 11 using the condenser lens 12 with less aberration.

[Effect of the invention]

As described above, the liquid crystal projector device of the present invention includes a light source lamp, a reflector that reflects lamp light emitted from the light source lamp, and a light incident on a reflection surface of the reflector, which is disposed close to a front opening of the reflector. A condenser prism for condensing the light that has not been emitted at substantially the same position as the light incident on the reflection surface of the reflector, and a condenser lens for causing the lamp light reflected by the reflector and the condenser prism to enter a liquid crystal display panel. And a projection lens for projecting the lamp light transmitted through the liquid crystal display panel onto a screen.

Therefore, almost all the lamp light emitted from the light source lamp can be collected by the reflector and the condensing prism and can be incident on the liquid crystal display panel, so that the incident efficiency of the lamp light incident on the liquid crystal display panel can be increased. The collected light is made incident on the condenser lens, so that the light can be directed in a predetermined direction, whereby a high-brightness projected image can be projected on the screen. Also,
Even if the light source lamp explodes due to the life of the lamp or the like, the condensing prism functions as an explosion-proof glass, and scattering of glass pieces and metal pieces can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a liquid crystal projector device showing a first embodiment of the present invention, FIG. 2 is a diagram showing a main part of the liquid crystal projector device showing a second embodiment of the present invention, and FIG. FIG. 2 is a configuration diagram of a liquid crystal projector device. 11 ... LCD panel, 12 ... Condenser lens, 13 ...
... Light source device, 14 Projection lens, 15 Screen, 16
…… Light source lamp, 17… Reflector, 18… Condenser prism.

Claims (2)

(57) [Scope of request for utility model registration] A light source lamp; a reflector for reflecting lamp light emitted from the light source lamp; and a light, which is arranged close to a front opening of the reflector and which is not incident on a reflection surface of the reflector, is reflected by the reflector. A condenser prism for condensing light at substantially the same position as the light incident on the reflection surface; a condenser lens for causing the lamp light reflected by the reflector or the condenser prism to enter a liquid crystal display panel; A liquid crystal projector device comprising: a projection lens that projects lamp light onto a screen. 2. The liquid crystal projector device according to claim 1, wherein an exit surface of said condenser prism is a concave lens surface.