JPH0563177U - LCD multi projector - Google Patents

Abstract

(57) [Abstract] [Purpose] To make the boundaries inconspicuous by matching the shading between individual displays of a liquid crystal multi-projector. [Structure] Light source 211 and first liquid crystal panels 200a-2
Second for shading correction, which is arranged between 00c and
Liquid crystal panel 104 and first liquid crystal panels 200a-2
00c and the projection lens 212, and a shading correction circuit 103 that receives the modulated light reflected by the half mirror 105 and drives the second liquid crystal panel 104.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In particular, it relates to a high-fine, large-screen projection device that can provide a sense of reality such as high-definition.

[0002]

[Prior Art]

 One example was the multi-arrangement of liquid crystal projectors with an aspect ratio of 4: 3 in the NTSC system, and the aspect ratio was changed to 16: 9 for high-definition television while at the same time increasing the screen size. FIG. 2 shows a multi-arrangement diagram of the conventional liquid crystal projector 201. The high-vision image signal is distributed by the multi-vision processor 204 to 4 × 3 = 12 NTSC screens of 4 × 3 aspect and projected on the large-screen screen 202.

[0003]

[Problems to be solved by the device]

 The drawbacks of this liquid crystal multi-projection system are its poor shading properties and the "seam" of the individual displays being visible as an O'Brien effect. The shading characteristic 205 is obtained by multiplying the characteristics of the metal halide lamp 211 and the lens.

[0004]

[Means for Solving the Problems]

 Therefore, in order to achieve the above-mentioned object, the first invention provides a light source, a first liquid crystal panel that modulates the light emitted from the light source with a video signal, and a modulated light from the first liquid crystal panel. A liquid crystal multi-projector in which n liquid crystal projectors (n is an integer of 2 or more) are combined, each including a projection lens for enlarging and projecting, and a second shading correction second lens arranged between the light source and the first liquid crystal panel. Liquid crystal panel, a half mirror arranged between the first liquid crystal panel and the projection lens, and a shading correction circuit for receiving the modulated light reflected by this half mirror and driving the second liquid crystal panel. Be prepared. In a second aspect of the present invention, the shading correction circuit includes an n-divided photosensor and a generation circuit that generates a shading correction pattern from the output of the photosensor.

[0005]

【Example】

 This embodiment is shown in FIG. The inverse shading filter 108 that corrects the shading characteristics of the metal halide lamp 211 is arranged between the cold mirror 213 and the dichroic mirror 214, and corrects the average shading characteristics of the metal halide lamp 211. Further, the half mirror 105 is arranged between the dichroic mirror 215 and the projection lens 212, and the entire white pattern emitted from each of the R, G, and B liquid crystals is converted into, for example, a 9-division optical sensor 102 via the converging lens 101. Shading information is obtained by collecting light and obtaining shading information as a characteristic in which the shading characteristics in the x, y and diagonal directions in the figure are connected by a curve close to the characteristics of the metal halide lamp 211, and the shading correction circuit 103 is used to make the shading uniform. Gray pattern is generated in the liquid crystal panel 104 of No. 2 to correct shading. The shading correction circuit 103 individually receives spline generation for x, y diagonal 1 and diagonal 2, and correspondingly performs the inverse spline operation 106, and the grating matrix matrix generator 107 performs the second matrix calculation by the matrix calculation. The liquid crystal panel 104 is driven.

[0006]

[Effect of the device]

 When correcting the shading of the liquid crystal multi-display, the shading peculiar to the multi-display can be corrected by the inverse shading filter 108 or the second liquid crystal panel 104 that constitutes the feedback system and the shading correction circuit 103. It is possible to realize a large-screen display in which "" is inconspicuous.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional example.

[Explanation of symbols]

 101 Converging Lens 102 9-Division Optical Sensor 103 Shading Correction Circuit 104 Second Liquid Crystal Panel for Shading Correction 105 Half Mirror 107 Grading Matrix Pattern Generator 108 Reverse Shading Filter 200 First Liquid Crystal Panel 201 Liquid Crystal Projector 202 Integrated Large Flat Screen 205 Shading characteristics 211 Metal halide lamp 212 Projection lens 213 Cold mirror 214,215 Dichroic mirror

Claims (2)

[Scope of utility model registration request] 1. A liquid crystal projector comprising a light source, a first liquid crystal panel for modulating light emitted from the light source with a video signal, and a projection lens for enlarging and projecting the modulated light from the first liquid crystal panel. A liquid crystal multi-projector combining n pieces (n is an integer of 2 or more), a second liquid crystal panel for shading correction arranged between the light source and the first liquid crystal panel, and the first liquid crystal panel and the projection. A liquid crystal multi-projector comprising a half mirror arranged between a lens and a shading correction circuit which receives the modulated light reflected by the half mirror and drives a second liquid crystal panel. 2. The liquid crystal multi-projector according to claim 1, wherein the shading correction circuit includes an n-divided photosensor and a generation circuit that generates a shading correction pattern from an output of the photosensor.