JP4356167B2 - LCD projector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal projector apparatus, and more particularly to an apparatus that increases the cooling efficiency of a polarizing plate and suppresses performance deterioration.
[0002]
[Prior art]
In the liquid crystal panel of the liquid crystal projector device, polarizing plates are arranged before and after the liquid crystal layer to control the polarization planes of incident light and outgoing light. As the polarizing plate, for example, a polarizing film pasted on a flat glass plate having a thickness of about 1 mm is used. However, the polarizing plate absorbs light on the polarizing surface which becomes unnecessary, so the temperature rises and burns occur. There is a problem that the polarization performance deteriorates. For this reason, the liquid crystal projector device is provided with a cooling fan to perform forced air cooling. However, as the brightness of the liquid crystal projector device increases, the amount of light incident on the liquid crystal panel increases, and the burden on the polarizing plate increases. There is a problem that the life of the plate is shortened.
[0003]
[Problems to be solved by the invention]
The present invention increases the cooling glass surface area of the polarizing plate to increase the cooling efficiency, or encloses the polarizing plate glass and encloses the refrigerant, disperses the heat by the convection of the refrigerant, suppresses the temperature rise, and polarization performance The purpose is to suppress the deterioration of the polarizing plate and extend the life of the polarizing plate.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, in the liquid crystal projector device of the present invention, in the liquid crystal projector device using a transmissive liquid crystal panel, the polarizing plates arranged on the incident side and the outgoing side of the liquid crystal panel are each formed into a bottomless rectangular tube shape. A polarizing film having predetermined polarization characteristics is attached to the surface of the formed glass substrate.
[0005]
The effective light ray transmitting surface of the glass substrate may be formed into a spherical surface so that incident light to the liquid crystal panel or outgoing light from the liquid crystal panel may be condensed. Alternatively, the spherical surface may be only the glass substrate of the polarizing plate on the incident side of the liquid crystal panel, and the incident light to the liquid crystal panel may be condensed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings. FIG. 1 is a block diagram showing the outline of a liquid crystal projector according to the present invention. In FIG. 1, 1 is a light source, 2 and 3 are integrator lenses, 4 is PBS (polarization beam splitter), 5, 9, 14, 18, 20 And 22 are lenses, 6, 8, 19 and 21 are mirrors for total reflection, 7 is a dichroic mirror that transmits red light and reflects green and blue light, 10, 15 and 23 are polarizing plates on the incident side, 11 is Liquid crystal panel for red, 12, 17 and 25 are polarizing plates on the outgoing side, 13 is a dichroic mirror that reflects green light and transmits blue light, 16 is a liquid crystal panel for green, 24 is a liquid crystal panel for blue, 26 Is a dichroic prism, and 27 is a projection lens.
[0007]
The white light from the light source 1 is collected by the integrator lenses 2 and 3, the s (or p) polarization component is extracted by the PBS 4, reflected by the mirror 6 through the lens 5, and the red light is transmitted by the dichroic mirror 7. 8, passes through the polarizing plate 10 through the lens 9, and enters the red liquid crystal panel 11. Of the green and blue rays reflected by the dichroic mirror 7, the green ray is reflected by the dichroic mirror 13, passes through the lens 14 through the polarizing plate 15, and enters the green liquid crystal panel 16. The blue light that has passed through the dichroic mirror 13 passes through the lens 18, the mirror 19, the lens 20, and the mirror 21, passes through the polarizing plate 23, and enters the blue liquid crystal panel 24. Light beams modulated by the three liquid crystal panels 11, 16 and 24 and passing through the polarizing plates 12, 17 or 25 are combined by the dichroic prism 26 and enlarged and projected on the screen by the projection lens 27.
[0008]
The incident side polarizing plates 10, 15 and 23 and the outgoing side polarizing plates 12, 17 and 25 of the three liquid crystal panels 11, 16 and 24 are formed as shown in the perspective view of FIG. That is, the polarizing plate is formed by sticking the polarizing film 33 having predetermined polarization characteristics to the glass substrate 31 formed in a bottomless rectangular tube shape. By forming the bottomless rectangular tube shape, the surface area of the glass substrate can be increased in the conventional space, and the heat dissipation effect can be increased. For example, the glass substrate 31 has a thickness of 1 mm × 2 and a width of 1 mm of the hollow portion 32 in total 3 mm. The glass substrate 31 has a good thermal conductivity by being integrally formed instead of bonding four glass plates. The heat generated in the film 33 is also conducted to the opposite side of the polarizing film 33 to dissipate heat. Alternatively, the glass substrate may be formed in a bottomed rectangular tube shape, and the refrigerant liquid may be enclosed so that heat unevenness is reduced by convection of the refrigerant liquid so that the heat can be easily radiated. In this case, as shown in the perspective view of FIG. 3, the opening of the glass substrate 41 must be closed with a lid 42. When the lid 42 is formed of a rubber material and the refrigerant liquid expands, the rubber material expands. The expansion of the refrigerant liquid is absorbed. The bottomless rectangular tube shape (mouth shape) of the glass substrate 31 may be a U-shape. Although the heat dissipation effect is reduced as compared with FIG. 2, the surface area is increased and the heat dissipation effect is improved.
[0009]
Also, a light reflection preventing layer is provided on the exit side surface of the glass substrate 31 (the left side surface of the glass substrate 31 in FIG. 2) so that the transmitted light beam is reflected and returned so that it does not re-reflect on the surface of the glass substrate 31. The transmittance of transmitted light is increased. The antireflection layer is provided at a location where effective light is transmitted. For example, the antireflection layer is formed by depositing a plurality of films made of materials having different refractive indexes on the surface of a transparent film, or by applying a fluororesin to form a film, and complicating the light incident on the layer. It is refracted to make it difficult to return to the front, and by providing a light reflection preventing layer, rereflection of reflected light is reduced, and the transmittance of transmitted light is increased. The same applies to the glass substrate 41.
[0010]
Further, the light ray transmitting surface of the glass substrate 31, for example, the polarizing film attaching surface or the opposite surface of the glass substrate 31 on the incident side of the liquid crystal panel is formed into a spherical surface, or both surfaces of the glass substrate 31 are formed into spherical surfaces, respectively. The lens 9, the lens 14, or the lens 22 shown in FIG. Thereby, the lens 9, the lens 14 or the lens 22 can be omitted. In addition, one side or both sides of the glass substrate on the incident side and the glass substrate on the outgoing side of the liquid crystal panel are formed into spherical surfaces, and the incident light and the outgoing light are condensed. You may be allowed to have 22 roles.
[0011]
【The invention's effect】
As described above, according to the liquid crystal projector device according to the present invention, the polarizing plate is formed with a bottomless rectangular tube-shaped glass substrate on which the polarizing film is adhered, and the surface area of the glass substrate is increased to facilitate heat dissipation. Therefore , the cooling efficiency is improved, the temperature rise of the polarizing plate is suppressed, the deterioration of the polarizing performance is suppressed, and the shortening of the life of the polarizing plate due to the high brightness of the liquid crystal projector device can be suppressed.
[Brief description of the drawings]
FIG. 1 is a main part configuration diagram showing an outline of a liquid crystal projector device according to the present invention;
FIG. 2 is a perspective view of an essential part of an embodiment of a polarizing plate of a liquid crystal projector device according to the present invention.
FIG. 3 is a perspective view of an essential part of another embodiment of a polarizing plate.
[Explanation of symbols]
1 Light source 2, 3 Integrator lens 4 PBS
5, 9, 14, 18, 20, 22 Lens 6, 8, 19, 21 Total reflection mirror 7, 13 Dichroic mirror
10, 15, 23 Polarizing plate (incident side)
11, 16, 24 LCD panel
12, 17, 25 Polarizing plate (outgoing side)
26 Dichroic prism
27 Projection lens
31, 41 Glass substrate
32 Hollow part
33 Polarizing film
42 lid

Claims (3)

 In a liquid crystal projector apparatus using a transmissive liquid crystal panel, a polarizing plate having predetermined polarization characteristics on the surface of a glass substrate in which polarizing plates disposed on the incident side and the outgoing side of the liquid crystal panel are each formed in a bottomless rectangular tube shape A liquid crystal projector device formed by attaching a film. Wherein the transmitting surface of the effective light beam of the glass substrate is formed in a spherical, a liquid crystal projector device of the light emitted according to claim 1 which is adapted for collecting light from the incident light or a liquid crystal panel of the liquid crystal panel. Wherein the transmitting surface of the effective light beam of the glass substrate of the polarizing plate on the incident side of the liquid crystal panel is formed in a spherical, a liquid crystal projector device according to claim 1, wherein the incident light to the liquid crystal panel so as to collect light.

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