JP3257553B2 - Liquid crystal display device and projection display device - Google Patents

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 and a projection display device using the liquid crystal display device as an optical shutter.

[0002]

2. Description of the Related Art In a conventional projection display device, as shown in FIG. This is for enlarged projection.

In the liquid crystal display device 22, as shown in FIG. 3, a liquid crystal panel 31 is connected to a wiring tape 32 on which a driving IC is mounted.
It is connected to the. The liquid crystal panel 31 has an effective display area 34
, non-driving area 35, seal area 36, connection terminal area 37
divided into

[0004] In order to secure the contrast ratio of the liquid crystal panel, polarizing plates are arranged on both sides of the liquid crystal panel according to the TN (twisted nematic) method.

[0005]

However, the prior art described above has the problem that the light from the light source is transmitted outside the effective display area of the liquid crystal display device, and an unnecessary projected image is displayed.

[0006] This is due to transmitted light from the connection terminal area 37, the non-driving area 35 when the polarization directions of the two polarizing plates are crossed, and the polarization direction of the two polarizing plates being parallel to each other. This is caused by the light transmitted from the seal area 36 in the case.

SUMMARY OF THE INVENTION It is an object of the present invention to solve such problems, and to provide a liquid crystal display device which does not produce an unnecessary projected image, and a projection type display device using the liquid crystal display device. to do.

[0008]

A liquid crystal display device of the present invention comprises an element substrate having an active element, a counter substrate arranged opposite to the element substrate, and a pair of substrates comprising the element substrate and the counter substrate. a seal portion for enclosing liquid crystal in the inner surface of one of the pair of substrates, a light shielding film formed in an area corresponding to the periphery of the effective display area on the inner surface of one of the pair of substrates, and the outer surface of the other substrate of the pair of substrates. at least a part of which overlaps with the light shielding film and is located on the effective display area side
the end of the light shielding film on the effective display area side than the end of the light shielding film
and a light shielding portion that is located on the peripheral side and is formed in a region on the outer peripheral side of the light shielding film. A projection display device of the present invention is a projection display device comprising a light source, a liquid crystal device for receiving light from the light source, and projection optical means for projecting an image formed by the liquid crystal device, The liquid crystal device includes an element substrate having active elements, a sealing portion for sealing liquid crystal between a pair of substrates including the element substrate and the counter substrate, and an inner surface of one substrate of the pair of substrates for effective display. When the light shielding film formed in the region corresponding to the periphery of the region overlaps with the light shielding film at least partially on the outer surface side of the other substrate of the pair of substrates
In both cases, the end portion on the effective display area side is the light shielding film.
and a light-shielding portion formed in a region on the outer peripheral side of the light-shielding film, which is located on the peripheral side of the end portion on the effective display region side .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a main cross-sectional view showing a liquid crystal display device (liquid crystal panel) used in a projection type display device according to the present invention.
Furthermore, a light shielding film 4 is formed on the outside of the other substrate 3 .

A method of manufacturing a liquid crystal display device using an active matrix substrate will be described as an example.

Active elements include thin film transistors, thin film diodes, and the like. However, in the present invention, the presence or absence or type of active elements does not affect the effects of the active elements, so an example of thin film transistors will be described. A polyimide resin is applied to a so-called active matrix substrate in which thin film transistors are arranged in a matrix on a transparent substrate and wiring such as signal lines and timing lines is formed,
Alignment treatment of the liquid crystal is performed by rubbing in a predetermined direction with a cotton cloth or the like. A transparent conductive film is formed on another transparent substrate, and a metal film is further formed. The metal film can be formed by vapor deposition or plating of metal such as Cr or Ni. This metal is formed into a predetermined shape by photoetching. At this time, the metal is removed from at least the effective display area, and the light shielding film 1 is formed by leaving the periphery of the effective display area. After the substrates formed in this way were subjected to alignment treatment in the same manner as the active matrix substrate, a resin film pattern was formed on one of the substrates by printing or the like in a sealing region for liquid crystal encapsulation, and alignment treatment was performed.
A liquid crystal panel is formed by fixing a resin film pattern on a sheet of substrates while holding a predetermined gap and enclosing liquid crystal 6 therein.

A black light-shielding film 4 is formed on the periphery of the liquid crystal panel by printing on the active matrix substrate side.
The peripheral part here means the connection terminal area, the sealing area and the non-driving area. Since the non-driving area is shielded by the light shielding film 1, it is not necessary to cover the entire area with the light shielding film 4. FIG. The liquid crystal panel is connected to the printed wiring board 7 by a wiring tape 8, and an IC for driving the liquid crystal is often mounted on the wiring tape. Since connection by wiring tape is weak in strength, it is generally reinforced by resin, but reinforcing plate 9 may be attached. If the reinforcing plate is made of a light-shielding metal or the like, the light-shielding range is widened.

FIG. 4 is a sectional view showing another example of a counter substrate 42.
Unlike FIG. 1, the light shielding film 41 formed on the liquid crystal side is not formed in the seal area. The light-shielding film may not be formed in the sealing region when the adhesion between the sealing material (resin film pattern) and the light-shielding film is poor, or when the sealing material is a photocurable resin.

A liquid crystal panel is formed by assembling the opposing substrate 42 and the active matrix substrate 3 in the same manner as described above.

The outer surface of the opposing substrate 42 (the side opposite to the liquid crystal)
Then, a light shielding film 44 is formed. The light-shielding film 44 is preferably formed of a metal film in advance by a vapor deposition method or a plating method.

The above liquid crystal panel is mounted on a printed wiring board. In the case of FIG. 4, the liquid crystal panel is held and fixed directly on the printed wiring board by providing a step on the printed wiring board. Because the printed wiring board also has a light shielding effect,
A printed wiring board 43 is formed so as to partially overlap with the light shielding regions formed by the light shielding films 41 and 44 . The printed wiring board is generally made of glass epoxy material and has poor light shielding properties. Therefore, in FIG. 4, a black ink material is applied as a light shielding film to the printed wiring board.

Yet another example is shown in FIG. A light shielding plate 51 is attached to the liquid crystal display device in the same manner as the example of FIG. 1 except that the light shielding film 4 in FIG. 1 is not formed. The light-shielding plate 51 partially overlaps the light-shielding film 1 in the same manner as the light-shielding film of the previous example, so that light does not leak.

The shielding plate 51 can be made thicker to have the effect of a reinforcing plate. In that case, as shown in FIG. should be slanted so that the light does not reflect.

[0019]

As described above, according to the present invention, light outside the effective display area can be completely blocked.

In particular, a light-shielding film is formed in a region corresponding to the periphery of the effective display region on the inner surface of one substrate, and a light-shielding film is formed on the outer surface of the other substrate at least partially overlapping the light-shielding film and on the outer peripheral side of the light-shielding film. Since the portion is formed, the light from the periphery of the display area can be blocked, and the leaked light does not enter the active element and deteriorate the function of the active element.

[Brief description of the drawing]

FIG. 1 is a principal cross-sectional view showing a light-shielded liquid crystal display device;

FIG. 2 is a schematic diagram of a projection display device;

FIG. 3 is a plan view of a liquid crystal display device;

FIG. 4 is a principal cross-sectional view showing a light-shielded liquid crystal display device;

FIG. 5 is a principal cross-sectional view showing a light-shielded liquid crystal display device;

[Description of symbols]

1, 41... light shielding film 5・・・Seal 7・・・Printed wiring board 6: LCD 4, 44 Light shielding film 51 light shielding plate

Claims (1)

(57) [Claims] An element substrate having an active element, an opposing substrate disposed opposite to the element substrate, a sealing portion for sealing liquid crystal between a pair of substrates including the element substrate and the opposing substrate, and one of the pair of substrates A light-shielding film formed in an area corresponding to the periphery of the effective display area on the inner surface side, and at least a part of the light-shielding film on the outer surface side of the other substrate of the pair of substrates overlaps with the light-shielding film; Area side
Of the light-shielding film is closer than the end of the light-shielding film on the effective display area side.
Located near side, and a liquid crystal display device, characterized in that it comprises a light shielding portion formed on the outer peripheral side region of the light shielding film. 2. A light source, a liquid crystal device that receives light from the light source,
In a projection display device having projection optical means for projecting an image formed by the liquid crystal device, the liquid crystal device has an element substrate having an active element,
A sealing portion for enclosing liquid crystal between a pair of substrates composed of the element substrate and the counter substrate, and a light-shielding film formed on an inner surface side of one of the pair of substrates and corresponding to a periphery of an effective display area And when at least a part of the pair of substrates is on the outer surface side of the other substrate and at least partially overlaps the light shielding film.
The end of the effective display area side is the effective end of the light shielding film.
And a light-shielding portion formed on an outer peripheral side of the light-shielding film on a peripheral side of an end on a display region side .