JP2006301325A - Image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display apparatus where light is emitted from a light source in accordance with brightness adjustment, and the uniformly adjusted light is easily obtained at any time, and also, the installation of a quick lamp replacement apparatus is unnecessary. <P>SOLUTION: Regarding the image display apparatus 1 wherein light emitted from a light emitting element array 2 is modulated by a spatial optical modulation element 7 in accordance with an image signal, then, the modulated light is projected on a screen so as to display the image, the image display apparatus 1 includes; a matrix-arrangement lens (lens 3) arranged facing the light emitting array 2, and wherein lenses for condensing the light emitted from the light emitting elements are two-dimensionally arranged; a magnifying lens 5 for magnifying the light condensed by the lens 3 so as to be as large as the shape width of the spatial optical modulation element 7 and projecting the light; a condenser lens 6 arranged between the magnifying lens 5 and the spatial optical modulation element 7, for emitting the light in parallel so that the light magnified and projected by the magnifying lens 5 may be modulated by the spatial optical modulation element 7 in accordance with the image signal; and a projection lens 8 for projecting and displaying the light projected in parallel from the condenser lens 6 on the screen 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides an image display capable of adjusting the brightness of an image obtained by uniformly radiating light emitted from a light source to a spatial light modulation element and enlarging the image displayed on the spatial light modulation element on a screen by a projection lens. Relates to the device.

With the advent of the digital multimedia era, a projection-type image display device capable of projecting a large-screen image with high definition has attracted attention. This image display device employs various structural forms.
An example of an image display apparatus capable of displaying an image with high brightness and high contrast is described in Patent Document 1.
FIG. 3 is a diagram for explaining a conventional image display device described in Patent Document 1. In FIG. FIG. 3A shows the brightest state when the aperture 102 is opened, FIG. 3B shows the case where the aperture 102 is almost in the middle, brightness and contrast are moderate, and FIG. In the state where 102 is most narrowed, the brightness is the smallest but the contrast is the best.

  As shown in FIG. 3, the conventional image display apparatus 100 has a diaphragm 102 that adjusts the light quantity of indefinitely polarized light emitted from a light source 101 composed of one lamp and a reflecting mirror, and the light quantity is adjusted via the diaphragm 102. Correction lens 103 that corrects the emission angle of the emitted light, condenser lens 104 that uniformly radiates the light whose emission angle has been corrected to the entire spatial light modulation element (light valve) 105, and light emitted from the condenser lens 104 Light that is uniformly incident on the entire surface and converted into light modulated according to a video signal and emitted, and light that is light-modulated from the spatial light modulation element 105 is projected on the screen 107. Lens 106.

Next, the operation will be described.
The indefinitely polarized light emitted from the light source 101 is incident on the spatial light modulation element 105 by the correction lens 103 and the condenser lens 104, converted into light modulated in accordance with the video signal by the spatial light modulation element 105, and then the projection lens. The image is enlarged and displayed on the screen 107 by 106.

Then, the light amount of the indefinitely polarized light emitted from the light source 101 by the diaphragm 101 is adjusted by the diaphragm 102 installed before the emission angle is corrected by the correction lens 103, and the brightness of the image displayed on the screen 107 is enlarged. I was adjusting it.
When the brightness of the image enlarged and displayed on the screen 107 is small and more brightness is required, the brightness is adjusted by opening the aperture 102 as much as possible, and when the image contrast is necessary, the aperture 102 is adjusted. Increase the aperture amount.

In this way, even if the amount of the indefinite polarized light emitted from the light source 101 is adjusted by the contrast required for the image displayed on the screen 107 by the diaphragm 102, the indefinite polarized light always emitted from the light source 101 is adjusted. Since the light is uniformly adjusted and incident on the spatial light modulator 105, even if the brightness is adjusted on the screen 107 and the light quantity is increased or decreased, a uniform and good image with no light quantity unevenness can be obtained on the screen 107. I was able to get it.
JP 2003-29203 A

  However, since the light source 101 has one lamp and it is necessary to always radiate the maximum amount of light required on the screen 107, heat is generated because the maximum amount of light is always required regardless of the brightness adjustment amount. The heat dissipation process must be taken into consideration easily, and the shape of the diaphragm 102 must be a precise structure that does not cause irregular reflection inside the diaphragm mechanism when adjusting the diaphragm in order to make the light quantity uniform. The problem is that it is difficult to realize, and furthermore, since there is one lamp that is a light source, there is a problem that a rapid lamp changer is required to minimize image display stoppage due to lamp burnout. there were.

  Therefore, the present invention has been made to solve the above-described problems, and the amount of light corresponding to the brightness adjustment amount is radiated from the light source, and the amount of light always adjusted uniformly can be easily obtained, and An object of the present invention is to provide an image display device that does not require a rapid lamp replacement device.

  According to a first aspect of the present invention, light emitted from a light emitting element array in which a plurality of light emitting elements are arranged two-dimensionally is modulated by a spatial light modulation element in accordance with a video signal, and projected on a screen. A matrix array lens (lens array) in which a plurality of lenses arranged to face the light emitting element array and condensing light emitted from the plurality of light emitting elements are two-dimensionally arranged; A magnifying lens that magnifies and emits the light collected by the lens in the same shape as the spatial light modulation element, and is arranged between the magnifying lens and the spatial light modulation element, and is magnified and emitted by the magnifying lens. Light is modulated in accordance with the video signal by the spatial light modulator and is emitted in parallel, and light emitted in parallel from the condenser lens is projected onto the screen. To provide an image display apparatus characterized by comprising: a projection lens for performing view, a.

  According to the present invention, light emitted from a light-emitting element array in which a plurality of light-emitting elements are two-dimensionally arranged is light-modulated by a spatial light modulator according to a video signal, and image display is performed on a screen. In the apparatus, a matrix array lens in which a plurality of lenses that are arranged opposite to a light emitting element array and collect light emitted from a plurality of light emitting elements are arranged two-dimensionally, and light collected by the plurality of lenses is spatial light A magnifying lens that magnifies and emits light in the same shape as the modulation element, and is arranged between the magnifying lens and the spatial light modulation element. And a condenser lens for parallel emission and a projection lens for projecting and displaying the light emitted in parallel from the condenser lens on the screen. Emitted from a source, always uniformly adjusted light quantity easily obtained a and rapid lamp replacement device can be unnecessary structure.

Hereinafter, an image display apparatus according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram for explaining an image display device according to an embodiment of the present invention, in which (A) is a diagram showing the brightest state, and (B) is a diagram showing a state in which brightness and contrast are neutral. (C) is a diagram showing a state where the brightness is the least and the contrast is the best.
FIG. 2 is a diagram showing a state of an optical path depending on a light emitting position of a light emitting element which is a light source according to the embodiment of the present invention, and FIG. 2A is a diagram showing an optical path from the light emitting element at an end portion. FIG. 2 is a diagram showing an optical path from a light emitting element between an end portion and a central portion, and FIG. 3C is a diagram showing an optical path of the light emitting element in the central portion.

  As shown in FIG. 1, an image display device 1 according to an embodiment of the present invention collects light emitted from a light emitting element array 2 and a light emitting element array 2 in which a plurality of light emitting elements are two-dimensionally arranged and used as a light source. A lens array 3 in which a plurality of light-emitting lenses are two-dimensionally arranged, a lens array 4 in which a plurality of lenses that align light emitted from the lens array 3 are arranged in a line (or a plurality of lines), and a lens array Magnifying lens 5 that magnifies and emits the light emitted from 4 with the same shape width as that of spatial light modulation element 7, and light that is arranged between magnifying lens 5 and spatial light modulation element 7 and is magnified and emitted from magnifying lens 5 A condenser lens 6 that modulates light in parallel according to a video signal by a spatial modulation element 7 and emits it in parallel, a spatial modulation element 7 that optically modulates transmitted light or reflected light according to a video signal, and a condenser lens 6 Constituted by the spatial modulation element 7 et parallel exit the projection lens 8 for projecting and displaying the light optically modulated on the screen 9, from.

Next, the operation will be described.
The light emitted from the light emitting element array 2 is imaged at the position of the lens array 4 by the lens array 3 (matrix array lens), and then parallel light to the spatial modulation element 7 via the condenser lens 6 by the magnifying lens 5. As incident. The parallel light incident on the spatial modulation element 7 is optically modulated in accordance with a predetermined video signal supplied to the spatial modulation element 7 and then enlarged and displayed as an image on the screen 9 by the projection lens 8.

  As shown in FIG. 1 (A), when all the light emitting element arrays 2 emit light, the brightest image is enlarged and displayed on the screen 9, and as shown in FIG. 1 (B), the light emitting element array 2 is displayed. When the light is emitted in the middle, a bright image and a contrast image are enlarged and displayed on the screen 9, and when only one light emitting element array 2 is made to emit light as shown in FIG. The image with the highest contrast is enlarged and displayed.

In this way
1) By turning on all of the two-dimensional arrays of matrix array lenses as shown in FIG.
2) “Contrast priority mode” is achieved by lighting only the inside of the two-dimensional array of matrix array lenses as shown in FIG.
Switching between the brightness priority mode and the contrast priority mode can be easily performed by controlling the lighting amount of the matrix array lens.

  Next, as shown in FIG. 2, the individual light emitting elements of the light emitting element array 2 pass through the lenses respectively positioned in the lens array 3 and the lens array 4, and then are spaced by the magnifying lens 5 and the condenser lens 6. Uniform parallel light corresponding to each individual light emitting element is incident on the entire modulation element 7.

FIG. 2 will be described in further detail.
FIG. 2A shows an optical path when only the light emitting element at the end is caused to emit light. Uniform parallel light in an oblique direction is incident on the entire spatial modulation element 7. FIG. 2B shows an optical path in the case where only the internal light emitting element emits light from the end, and uniform parallel light having a slightly reduced angle in the oblique direction is incident on the entire spatial modulation element 7. FIG. 2C shows an optical path when only the central light emitting element emits light, and uniform parallel light is incident on the entire spatial modulation element 7.

According to the image display apparatus according to the embodiment of the present invention described above, the number of light emitting elements of the light emitting element array 2 can be made to emit light according to predetermined brightness and contrast as shown in FIG. The amount of heat generated can be reduced according to the brightness of the.
In addition, as shown in FIG. 2, all the light emitting elements of the light emitting element array 2 individually emit light to the entire surface of the spatial modulation element 7, so that even if light emission of one light emitting element stops, The light emitting element can be switched instantaneously.

It is a figure for demonstrating the image display apparatus which concerns on embodiment of this invention, (A) is a figure which shows the brightest state, (B) is a figure which shows the state where brightness and contrast are neutral, ( C) is a diagram showing a state in which the brightness is the least and the contrast is the best. FIG. 4A is a diagram illustrating a state of an optical path depending on a light emission position of a light emitting element that is a light source according to the embodiment of the present invention, FIG. 5A is a diagram illustrating an optical path from the light emitting element at an end portion, and FIG. It is a figure which shows the optical path from the light emitting element between a center part, and (C) is a figure which shows the optical path of the light emitting element of a center part. It is a figure for demonstrating the conventional image display apparatus, (A) is a figure which shows the brightest state, (B) is a figure which shows a state with a moderate brightness and contrast, (C) is brightness. It is a figure which shows the state with the least contrast and the best contrast.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image display apparatus, 2 ... Light emitting element array, 3, 4 ... Lens array (matrix arrangement lens), 5 ... Magnifying lens, 6 ... Condenser lens, 7 ... Spatial modulation Element, 8 ... projection lens, 9 ... screen

Claims (1)

In an image display device that performs light modulation of light emitted from a light emitting element array in which a plurality of light emitting elements are two-dimensionally arranged according to a video signal by a spatial light modulation element, and performs projection display on a screen.
A matrix array lens in which a plurality of lenses that are arranged opposite to the light emitting element array and collect light emitted from the plurality of light emitting elements are two-dimensionally arranged;
A magnifying lens that magnifies and emits the light collected by the plurality of lenses in the same shape as the spatial light modulator;
A condenser lens that is disposed between the magnifying lens and the spatial light modulation element and is optically modulated in accordance with a video signal by the spatial light modulation element according to a video signal, and is emitted in parallel.
A projection lens that performs projection display on the screen of light emitted in parallel from the condenser lens;
An image display device comprising:

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