Apparatus and method for reducing perceived color shift
First Claim
Patent Images
1. A display device comprising:
- at least one light-modulating element configured to output colored light, said light-modulating element comprising first and second reflective surfaces that define an optical cavity, said second surface being movable with respect to said first surface so as to adjust an optical path length of said optical cavity, wherein the at least one light-modulating element comprises an interferometric modulator; and
a filter comprising a layer of material that selectively transmits certain visible wavelengths and substantially filters other visible wavelengths when illuminated with white light, said filter positioned to filter light modulated by said light-modulating element so as to reduce variation of color of said output colored light with angle of view.
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Abstract
An apparatus and method for reducing perceived color shift as a function of viewing angle is disclosed. One embodiment is a display device that includes a color light modulator and a color filter. The filter is configured to filter wavelengths of light that would be perceived as color shifted light when reflected by the modulator at an off-axis viewing angle. Another embodiment includes a color light modulator and a color light source configured to provide light having a spectral content that lacks the wavelengths that would be perceived as color shifted light by a view of the display at an off-axis viewing angle. Another embodiment are methods of making such display devices.
218 Citations
80 Claims
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1. A display device comprising:
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at least one light-modulating element configured to output colored light, said light-modulating element comprising first and second reflective surfaces that define an optical cavity, said second surface being movable with respect to said first surface so as to adjust an optical path length of said optical cavity, wherein the at least one light-modulating element comprises an interferometric modulator; and a filter comprising a layer of material that selectively transmits certain visible wavelengths and substantially filters other visible wavelengths when illuminated with white light, said filter positioned to filter light modulated by said light-modulating element so as to reduce variation of color of said output colored light with angle of view. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of fabricating a display, comprising:
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forming a light-modulating element configured to output colored light, said color light-modulating element comprising first and second reflective surfaces that form an optical cavity, said second surface being movable with respect to said first surface so as to adjust an optical path length of said optical cavity, wherein the at least one light-modulating element comprises an interferometric modulator; and positioning a filter comprising a layer of material with respect to said light-modulating element such that said filter filters light modulated by said light-modulating element, said layer of material selectively transmitting certain visible wavelengths and substantially filtering other visible wavelengths when illuminated with white light so as to reduce variation of color of said output colored light with angle of view. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A display system comprising:
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a light-modulating element configured to output colored light having at least one spectral peak within the visible spectrum, said light-modulating element comprising first and second reflective surfaces that define an optical cavity, said second surface being movable with respect to said first surface so as to adjust an optical path length of said optical cavity, wherein the light-modulating element comprises an interferometric modulator; and a light emitter that outputs visible light having at least one spectral peak within the visible spectrum, said light emitter configured to illuminate said first and second reflective surfaces of said light-modulating element so as to reduce variation of color of said output light with angle of view. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A method of fabricating a display device comprising:
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providing a light-modulating element configured to output colored light having at least one spectral peak within the visible spectrum, said light-modulating element comprising first and second reflective surfaces that form an optical cavity, said second surface being movable with respect to said first surface so as to adjust an optical path length of said optical cavity, wherein the light-modulating element comprises an interferometric modulator; and positioning a light emitter with respect to said light-modulating element to illuminate said first and second reflective surfaces of said light-modulating element, said light emitter outputting visible light having at least one spectral peak within the visible spectrum so as to reduce variation of color of said output light with angle of view. - View Dependent Claims (56, 57, 58, 59)
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60. A display device comprising:
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a plurality of light-modulating elements configured to output colored light, said light-modulating elements comprising first and second reflective surfaces that define an optical cavity, said second surface being movable with respect to said first surface so as to adjust an optical path length of said optical cavity, wherein the plurality of light-modulating elements includes an interferometric modulator; and a filter array comprising a plurality of filter elements that selectively transmit certain visible wavelengths and substantially filter other visible wavelengths when illuminated with white light, at least two of said filter elements having different transmission spectrums, said filter array positioned to filter light modulated by said light-modulating elements so as to reduce variation of color of said output colored light with angle of view. - View Dependent Claims (61, 62, 63, 64)
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65. A method of fabricating a display, comprising:
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forming a plurality of light-modulating elements configured to output colored light, said color light-modulating elements comprising first and second reflective surfaces that form an optical cavity, said second surface being movable with respect to said first surface so as to adjust an optical path length of said optical cavity, wherein the plurality of light-modulating elements includes an interferometric modulator; and positioning a filter array comprising a plurality of filter elements with respect to said light-modulating elements such that said filter array filters light modulated by said plurality of light-modulating elements, at least two of said filter elements having different transmission spectrums, so as to reduce variation of color of said output colored light with angle of view. - View Dependent Claims (66, 67, 68, 69)
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70. A display device comprising:
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means for interferometrically modulating incident light so as to output colored light, said means comprising an interferometric modulator; and means for selectively transmitting certain visible wavelengths and substantially filtering other visible wavelengths when illuminated with white light, wherein said means for selectively transmitting reduces perceived color shift of said output colored light so as to reduce variation of color of said output colored light with angle of view. - View Dependent Claims (71, 72, 73, 74, 75)
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76. A display device, comprising:
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means for interferometrically modulating incident light so as to output colored light having at least one spectral peak within the visible spectrum, said means comprising an interferometric modulator; and means for illuminating said means for interferometrically modulating with visible light having at least one spectral peak within the visible spectrum so as to reduce variation of color of said output light with angle of view. - View Dependent Claims (77, 78, 79, 80)
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Specification