Projection displayed image and display device with oblique bidirectional color filter

Abstract

The image viewing device on the projection screen comprises: matrices of reflecting elements which can be electrically driven, and means for deconstructing a beam of polychromatic light and means for reconstructing complementary reflected beams, comprising two dichroic filters with a gradient where, for at least one of these filters, the direction of the gradient HOG, H'OG' makes an angle of inclination of non-zero gradient delta, delta' with a plane (DOE, D'OE') orthogonal to the reflecting surfaces of the matrices. By virtue of the inclination of the gradient, the chromatic performance of the device is substantially improved.

Description

technical field [0001] The invention relates to a device for displaying images on a projection screen. Background technique [0002] refer to figure 1 To 4, the devices of the prior art include: [0003] Fires a normal continuous polychromatic beam B S light source 1, [0004] Deconstruct this polychromatic beam into a complementary beam B B , B G and B R The device 2, the wavelength ranges of these light beams are different, corresponding to the three standard primary colors blue B, green G and red R respectively, [0005] at each of the complementary beams B B , B G and B R The reflective element matrix M in the path B , M G and M R , they can be electrically driven according to the image to be displayed, [0006] The complementary beam B' that will be reflected B , B' G and B' R Reconstituted as a monomodulated polychromatic beam B P device 3, [0007] After the beam is reconstructed, the reflection matrix M B , M G and M P The optical system 4 for pr...

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Problems solved by technology

[0023] Therefore, not only at the incident midpoint O of the filter, but also along the incident beam B S The entire longest dimension that intersects the filter is the straight line AOC, the fact is that for the matrix M B , M G and M R The angle of incidence α is non-zero, which leads to a difference between the actual angle of incidence and the ideal angle of incidence where the cut-off wavelength is constant through the slope of the dichroic filter along the entire line AOC; degree of filter, the fact that the α angle is not zero, still results in a detrimental shift in the cut-off wavelength of the dichroic filter of the deconstruction device 2 or the reconstruction device 3, or even both; so harmful because it causes color defects in the displayed image

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