Lighting device and projection type image display device

Abstract

There is provided an illuminator to emit trichromatic light. It includes a lamp (1) which emits trichromatic light including components whose wavelengths correspond to three primary colors, respectively, and a wavelength-selective optical aperture filter (22) provided at the side of the lamp (1) from which the light of three primary colors go out and consisting of zones working as predetermined optical apertures of which one selectively attenuates or shields a component included in the trichromatic light and having a wavelength corresponding to at least one of the three primary colors while the others allow the light components whose wavelengths correspond to the other primary colors to pass through.

Description

technical field [0001] The present invention relates to a lighting device that emits three-color lights including components whose wavelengths correspond to three primary colors: red, green and blue, respectively, and to a projection type image display device that projects the three-color lights emitted from the lighting device to display color images. Background technique [0002] Hitherto, projection type image display devices have been developed in which white light is separated by a dichroic mirror (dichroic mirror) into three primary colors: components of red (R), green (G) and blue (B), and these R, The G and B components are respectively incident on three image display panels, such as a liquid crystal display (LCD) panel, and the light components passing through the image display panels are combined to generate synthetic light, and the synthetic light is projected onto the screen. [0003] In the projection type image display apparatus described above, the whiteness o...

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Problems solved by technology

[0006] However, the above method requires as many optical attenuation devices as channels to be attenuated, such as ND filters, which will result in complicated configuration of the device, i.e., result in a large number of parts and many manufacturing steps

Also, it is not expected that images can be displayed with a higher contrast than when the driving level of the liquid crystal panel is not lowered.

[0007] Therefore, any illuminating device and projection type image display device having a simple structure, capable of adjusting the whiteness of projected light and displaying images with improved contrast have not yet been realized.

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