JP2923883B2 - Color synthesis device for liquid crystal projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color synthesizing apparatus for a liquid crystal projector of a type in which white light from a light source is separated, modulated by a plurality of liquid crystal displays, and synthesized again to display an image.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional example of a color synthesizing device in a liquid crystal projector (LCD-PJ). The color synthesizing device for a liquid crystal projector shown in FIG.
In PJ color synthesizing system, a cross dichroic prism 101 and the liquid crystal panel 102 as shown in FIG. 3 is a structure that has been separated, and convergence adjustment adjusting mechanism 1
03 is used and the three liquid crystal panels 102 are aligned.

In this conventional example, an adjusting mechanism 103 is provided between the cross dichroic prism 101 and the liquid crystal panel 102, and a base member 1 which holds the adjusting mechanism 103 and the cross dichroic prism 101.
04, etc., which include many structural elements for pixel shift.

FIG. 4 is a schematic plan view of a color synthesizing device in a liquid crystal projector disclosed in Japanese Patent Application Laid-Open No. 6-118368. In the conventional example shown in FIG.
Reference numeral 401 denotes a cross dichroic prism, and reference numeral 402 denotes a liquid crystal panel. Reference numeral 403 denotes an adhesive, reference numeral 404 denotes a front polarizer, and reference numeral 405 denotes a rear polarizer.

[0005] Here, the liquid crystal panel 402 is provided with an adhesive 403.
Is attached to the cross dichroic prism 401. The front polarizing plate 404 is arranged on the incident light surface side of the liquid crystal panel 402, and the rear polarizing plate 405 is attached to the outgoing light surface of the cross dichroic prism 401.

[0006]

However, in each of the above-mentioned conventional examples, for example, in the case of FIG. 3, the pixel between the liquid crystal panels is interposed between the cross dichroic prism 101 and the liquid crystal panel 102. In order to perform the alignment, a complicated adjustment mechanism 103 having a six-axis adjustment element is required, and the adjustment mechanism 103 itself is a structural element that generates a pixel shift due to thermal expansion and impact. In the color synthesizing apparatus for a liquid crystal projector (LCD-PJ), there is a disadvantage that the reliability of the liquid crystal projector (LCD-PJ) for pixel shift is poor. FIG.
The same applies to the other conventional examples shown in FIG.

Further, in each of the above conventional examples, as described above, a complicated adjusting mechanism for aligning pixels between liquid crystal panels is required, and the color synthesizing system itself becomes large in size. Therefore, there is always an inconvenience that it becomes an obstacle to miniaturization of the whole set.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a color synthesizing apparatus for a liquid crystal projector in which the inconvenience of the prior art is improved, and the overall size of the apparatus and the reliability are improved in consideration of portability. And its purpose.

[0009]

Means for Solving the Problems To achieve the above object,
Because, in the present invention, R light formed by dispersing the white light from the light source, the G light and B light, at least a plurality of is modulated by the liquid crystal panel again synthesized color combining device for a liquid crystal projector for projecting an image In the above, each of the liquid crystal panels described above is directly mounted on each of the R, G, and B light incidence surfaces on the cross dichroic prism unit so that convergence on the projection screen after color synthesis is matched .

Then, this liquid crystal panel is connected to the
Each of the four dichroic prism sections
Each of R light, G light and B light on the dichroic prism
A pixel electrode layer including a TFT formed directly on the incident surface;
The common electrode layer laminated on the pixel electrode layer of
Each cross dichro constituting the dichroic prism
The liquid crystal sealed between the ic prism and the glass substrate
Therefore, it is formed. This allows each cross dichroic
The liquid crystal panel is configured as a part of the liquid crystal panel,
It adopts a configuration that embodied.

Therefore, the present invention does not require a complicated adjusting mechanism between the cross dichroic prism portion and the liquid crystal panel unlike the prior art. The displacement can be reliably reduced. Furthermore, because there is no adjustment mechanism, the space becomes smaller, which leads to a smaller overall set.
Also, the number of parts can be reduced.

A flexible circuit board (PWB) for each of the cross dichroic prisms is mounted upward at an end in the same direction (an upper end in FIG. 1) of the incident surface of each cross dichroic prism. Then, the same assembling process as in the conventional example can be performed, and the maintenance becomes easy, which is convenient.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a cross dichroic prism unit 10 of a color synthesizing device for a liquid crystal projector (a color synthesizing device for LCD-PJ).
The cross dichroic prism section 10 is composed of a combination of four cross dichroic prisms 11, 12, 13, and 14, and is formed in a cubic shape as a whole. And each cross dichroic prism 11-
14 has a shape obtained when the cubic cross dichroic prism section 10 is cut along a diagonal line.

As shown in FIG. 1, the cubic cross dichroic prism section 10 has three sides 11A,
R light, G light and B light are individually incident from 12A and 13A, respectively, and the combined light is applied to a fourth surface (combined light emission surface).
From 14A, it is output to the outside. Arrows R, G, B, and A indicate directions of R light, G light, B light, and A light, respectively. These R light, G light and B light are
In the present embodiment, one formed by dispersing white light from a light source is used.

Each of the three surfaces 11 of the cross dichroic prism section 10 on which the R, G, and B lights are incident.
A to 13A have TFTs (Thin F) as shown in FIG.
a pixel electrode layer 21 including a common electrode layer 22 is directly mounted thereon.
3 are individually stacked (in a state of being attached). Here, reference numeral 27 denotes a bonding portion between the cross dichroic prism 11 and the glass substrate 23 in FIG.

Further, a liquid crystal 24 is sealed between each of the three surfaces 11A to 13A of the cross dichroic prism portion 10 and the glass substrate 23 to form a liquid crystal panel 25, thereby forming the cross dichroic prism. The configuration is such that the prisms 11 to 13 and the liquid crystal panel 25 are integrated.

As described above, the liquid crystal panel 25 described above
Each of the cross dichroic prisms 11 to 13 is individually provided on each of the light incident surfaces 11A to 13A.
The convergence on the projection screen after the above-described color composition can be achieved uniquely without any adjustment.

A flexible circuit board (PWB) 26 for each of the cross dichroic prisms 11 is mounted on the upper end of the incident surface (see FIG. 1) of each of the cross dichroic prisms 11 in an upright state. . Thereby, it is easily connected to a control system (not shown) constituting the liquid crystal projector, and a predetermined signal is sent to the liquid crystal panel 25.

As described above, according to the above-described embodiment, a complicated adjustment mechanism is not required between the cross dichroic prism and the liquid crystal panel as in the above-described prior art.
For this reason, there is an advantage that pixel shift due to thermal expansion and impact can be reduced, and further, since there is no adjustment mechanism, the entire apparatus can be reliably reduced in size and the number of parts can be reduced.

[0020]

As described above, according to the present invention, RGB
Since each cross dichroic prism provided with a light incident surface of the above is provided with a predetermined liquid crystal panel, an intermediate member such as a complicated adjustment mechanism is not required, and therefore, the liquid crystal panel such as a cross dichroic prism generated in the conventional example is not required. Pixel displacement is completely eliminated due to thermal expansion and impact between the device, and in this respect, the reliability of the entire device, particularly against pixel displacement, can be improved. In addition, there is no need for an intermediate member such as a complicated adjustment mechanism between the cross dichroic prism and the liquid crystal panel. Therefore, it is possible to reduce the size of the entire color synthesizing system. It is possible to provide an unprecedented and excellent color synthesizing apparatus for a liquid crystal projector, which can greatly reduce the number of points and can expect a large cost reduction by mass production effects.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged partial cross-sectional view showing a bonding unit forming a liquid crystal unit disclosed in FIG.

FIG. 3 is a schematic perspective view showing a conventional example.

FIG. 4 is a schematic perspective view showing another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Cross dichroic prism part 11, 12, 13, 14 Cross dichroic prism 11A R light incidence surface 12A G light incidence surface 13A B light incidence surface 14A Synthetic light emission surface 21 Pixel electrode layer (including TFT) 22 Common electrode layer 23 Glass Substrate 25 Liquid crystal panel 26 Flexible circuit board (PWB) 27 Bonding part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/1335 G02F 1/13 505

Claims (2)

(57) [Claims] 1. A color synthesizing apparatus for a liquid crystal projector which modulates R light, G light and B light formed by dispersing white light from a light source by at least a plurality of liquid crystal panels and synthesizes again to display an image. Each of the liquid crystal panels is directly mounted on each of the R, G, and B light incident surfaces on the cross dichroic prism unit so that the convergence on the projection screen after the color synthesis is matched . The cross dichroic prism
Each section has four cross dichroic prisms
The T formed directly on each of the incident surfaces of the R light, G light and B light
A pixel electrode layer including FT, and a pixel electrode layer
Common electrode layer and the cross dichroic prism
Each cross dichroic prism and glass base
A color synthesizing apparatus for a liquid crystal projector , wherein each cross dichroic prism section is formed as a part of the liquid crystal panel and integrated with the liquid crystal sealed between the plates . 2. The cross dichroic prism of claim 1, wherein
On the entrance surface, for each cross dichroic prism
2. A color synthesizing apparatus for a liquid crystal projector according to claim 1, wherein a flexible circuit board (PWB) is mounted .