JPH06110040A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To enable efficient cooling without increasing the size of the whole device by arranging a cooling unit, composed a glass container containing a refrigerant and a heat radiation part, and forming microlenses at the liquid crystal display panel side part of the glass container. CONSTITUTION:Liquid crystal pixels 2a and a black matrix part 2b are formed at the part held with the glass substrates 1a and 1b of a liquid crystal display panel 1. The microlens array 5 is jointed to the light incidence surface side glass substrate 1a of the liquid crystal display panel 1 by using a joining material 6. On the light projection surface of the glass substrate 5a, microlenses 5b are arranged. The cooling unit 9 is joined to the light projection side surface of a projection side polarizing plate 8. The cooling unit 9 form the glass container 10 with two flat glass plates 10a and 10b and a glass frames 10c as a spacer and discharge fins 11 project from the upper end. The glass container 10 is filled with the refrigerant 12. Microlenses 10d are formed on the light incidence side surface of the flat glass plate 10a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device used in a liquid crystal projector or the like.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal display device guides light from a light source to a liquid crystal display device as parallel incident light with a condenser lens or the like, and an image formed by the light passing through the liquid crystal display device is projected through a projection lens. It is used as a light valve for liquid crystal projectors that magnify and project on a screen.

As the above-mentioned liquid crystal display device, there is one disclosed in, for example, Japanese Unexamined Patent Publication No. 2-115889. In this liquid crystal display device, as shown in FIG. 2, microlens arrays 3 and 4 are provided on the light entrance surface side and the light exit surface side of the liquid crystal display panel 1 in which the liquid crystal pixels 2a are arranged. In the liquid crystal display device provided with the microlens arrays 3 and 4, parallel incident light, which is conventionally shielded from the black matrix portion 2b which is a non-pixel region of the liquid crystal display panel 1, is also guided to each liquid crystal pixel 2a region, and an opening is formed. The rate is improved, and it is possible to display a very bright image.
Then, the light that has passed through the liquid crystal display panel 1 has a microlens array 4 provided on the light emitting surface side of the liquid crystal display panel.
After being converted into parallel light by, the parallel light is incident on a projection lens (not shown).

Further, as shown in FIG. 3, there is also a liquid crystal display device in which the microlens array 3 is arranged only on the light incident surface side of the liquid crystal display panel 1.

However, in the liquid crystal display device as described above, the amount of light transmitted through the liquid crystal display panel 1 increases due to the microlens array 3 arranged on the light entrance surface side of the liquid crystal display panel 1. The temperature rises in. For this reason, the conventional air-cooling system such as a cooling fan has a problem that the specific heat of air is small and it is necessary to increase the air volume, and the noise from the fan is severe. Further, in the cooling method in which the liquid refrigerant is circulated, the above-mentioned noise problem is solved, but it is necessary to separately provide the microlens array and the refrigerant mechanism in the liquid crystal display device, which causes a problem that the entire device becomes large. is there.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the drawbacks of the above-mentioned conventional example, and enables efficient cooling without noise generation and without increasing the size of the entire apparatus. An object of the present invention is to provide a liquid crystal display device.

[0007]

In a liquid crystal display device of the present invention, a cooling unit including a glass container having a refrigerant therein and a heat radiating portion is provided on at least one of a light entrance surface side and a light exit surface side of a liquid crystal display panel. It is characterized in that microlenses are formed in the portion of the glass container on the liquid crystal display panel side of the glass container.

[0008]

According to the above structure, the light from the light source can be effectively used by the microlens array, and the microlens array is formed in the glass container of the cooling unit, so that the efficiency can be improved without increasing the size of the apparatus. Good cooling is possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of the liquid crystal display device of this embodiment.

In the figure, reference numeral 1 denotes a matrix-type transmissive liquid crystal display panel, a liquid crystal pixel 2a serving as a display unit in a portion sandwiched between glass substrates 1a and 1b, and a black matrix portion 2b serving as a non-pixel area. Are formed. 5
Is a microlens array bonded to the glass substrate 1a on the light-incident surface side of the liquid crystal display panel 1 with a bonding material 6 such as a transparent silicone adhesive or silicon oil. The liquid crystal display portion 2a on the light-exiting surface of the glass substrate 5a. A microlens 5b is arranged in a portion corresponding to. Reference numeral 7 denotes an incident side deflection plate arranged on the light incident surface side of the microlens array 5. Reference numeral 8 denotes an emission side deflection plate which is bonded to the light emitting surface side glass substrate 1b of the liquid crystal display panel 1 by the same bonding material 6 as described above. A cooling unit 9 is joined to the light exit side surface of the exit side deflection plate 8 by a joining material (not shown) such as a transparent silicone adhesive or silicone oil as described above.

The cooling unit 9 forms a flat glass container 10 with two flat glass plates 10a and 10b and a frame glass 10c which serves as a spacer, and a radiating fin (heat radiating means) 11 projects from the upper end of the container 10. ing. The glass container 10 is filled with a refrigerant 12 such as deaerated fluorine-based inert liquid. Further, of the two flat glass plates 10a and 10b constituting the glass container 10, the light-incident surface of the flat glass plate 10a located on the liquid crystal display panel 1 side corresponds to the liquid crystal display section 2a. The microlens 10d is formed on.

In the liquid crystal display device of the above-mentioned embodiment, the light 13 emitted from the light source (not shown), converted into parallel light by the condenser lens (not shown), and passed through the incident side deflection plate 7 is used. , The liquid crystal pixels 2a of the liquid crystal display panel 1 by the microlenses 5b of the microlens array 5 on the light incident surface side.
Converge to pass through. The light that has passed through the liquid crystal pixels 2a of the liquid crystal display panel 1 passes through the emission side deflection plate 8 and is then converted again into parallel light by the microlens 10d formed on the flat glass 10a of the glass container 10 and the projection lens group. Light enters (not shown), is projected on a screen (not shown), and an image is displayed.

In the above operation, the liquid crystal display panel 1,
The incident side deflection plate 7 and the emission side deflection plate 8 absorb light and generate heat. This heat is transmitted to the glass container 10 of the cooling unit 9, natural convection occurs in the refrigerant 12, the heat is carried to the upper part by the refrigerant 12, and is radiated to the outside from the radiation fin 11.

By the above heat radiation operation, the heat generated in the liquid crystal display panel 1, the incident side deflection plate 7, and the emission side deflection plate 8 is radiated to the outside from the heat radiation fins 11 of the cooling unit 9. In particular, since the amount of light passing through the liquid crystal display panel 1 and the emission side deflection plate 8 is increased by the microlens array 5, the amount of heat generated by the liquid crystal display panel 1 and the emission side deflection plate 8 does not include the microlens array. However, in this embodiment, since the cooling unit 9 is provided on the light exit surface side of the exit side deflection plate 8, the increased heat generated by providing the microlens array 5 is efficiently radiated. can do.

As described above, in the liquid crystal display device of this embodiment, the amount of light passing through the liquid crystal pixels 2a of the liquid crystal display panel 1 is increased by the microlens array 5, so that the brightness of the image projected on the screen is improved. Further, the heat generated by the microlens array 5 is efficiently dissipated by the cooling unit 9. Moreover, since the flat glass plate 10a constituting the glass container 10 of the cooling unit 9 is also used as the glass substrate forming the microlens 10d and the flat glass plate 10a of the glass container 10 is used as the microlens array, the liquid crystal display panel 1 It is not necessary to separately provide the microlens array and the cooling unit located on the light emitting surface side, and the entire apparatus does not become large.

In the above embodiment, the cooling unit having the microlens array is provided on the light exit surface side of the liquid crystal display panel. However, in addition to this, the cooling unit having the microlens array on the light entrance surface side of the liquid crystal display panel is provided. A unit may be provided. Further, a cooling unit having a microlens array may be provided on both the light-entering surface side and the light-emitting surface side of the liquid crystal display panel.

[0018]

According to the present invention, it is possible to provide a liquid crystal display device which improves the brightness of a projected image and enables efficient cooling without increasing the size of the entire device.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a liquid crystal display device of the present invention.

FIG. 2 is a main part configuration diagram of a conventional liquid crystal display device.

FIG. 3 is a main part configuration diagram of a conventional liquid crystal display device.

[Explanation of sign]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 9 Cooling unit 10 Glass container 10a Flat glass (liquid crystal display panel side part) 10d Micro lens 11 Radiating fin (radiating means) 12 Refrigerant

Claims (1)

[Claims] 1. A liquid crystal display panel is provided with a cooling unit including a glass container having a refrigerant therein and a heat radiating portion on at least one of a light entrance surface side and a light exit surface side, and the liquid crystal display panel side of the glass container. A liquid crystal display device characterized in that a microlens is formed in the portion.