APPARATUS AND METHOD FOR REDUCING OPTICAL CROSS-TALK IN IMAGE SENSORS
First Claim
1. An image sensor device, comprising:
- a semiconductor substrate having a front surface and a back surface;
a plurality of pixels formed on the front surface of the semiconductor substrate, each pixel being adapted for sensing light radiation;
an array of color filters formed over the plurality of pixels, each color filter being adapted for allowing a wavelength of light radiation to reach at least one of the plurality of pixels; and
a plurality of micro-lens formed over the array of color filters, each micro-lens being adapted for directing light radiation to at least one of the color filters in the array;
wherein the array of color filters further includes a structure adapted for blocking light radiation that is traveling towards a region between adjacent micro-lens.
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Abstract
An image sensor device includes a semiconductor substrate having a front surface and a back surface; an array of pixels formed on the front surface of the semiconductor substrate, each pixel being adapted for sensing light radiation; an array of color filters formed over the plurality of pixels, each color filter being adapted for allowing a wavelength of light radiation to reach at least one of the plurality of pixels; and an array of micro-lens formed over the array of color filters, each micro-lens being adapted for directing light radiation to at least one of the color filters in the array. The array of color filters includes structure adapted for blocking light radiation that is traveling towards a region between adjacent micro-lens.
44 Citations
20 Claims
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1. An image sensor device, comprising:
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a semiconductor substrate having a front surface and a back surface; a plurality of pixels formed on the front surface of the semiconductor substrate, each pixel being adapted for sensing light radiation; an array of color filters formed over the plurality of pixels, each color filter being adapted for allowing a wavelength of light radiation to reach at least one of the plurality of pixels; and a plurality of micro-lens formed over the array of color filters, each micro-lens being adapted for directing light radiation to at least one of the color filters in the array; wherein the array of color filters further includes a structure adapted for blocking light radiation that is traveling towards a region between adjacent micro-lens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for making an image sensor device, comprising:
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providing a semiconductor substrate having a front surface and a back surface; forming a plurality of pixels on the front surface of the semiconductor substrate, each pixel being adapted for sensing light radiation; forming an array of color filters over the plurality of pixels, each color filter being adapted for allowing a wavelength of light radiation to reach at least one of the plurality of pixels; and forming a plurality of micro-lens over the array of color filters, each micro-lens being adapted for directing light radiation to at least one of the color filters in the array; wherein the forming the array of color filters further includes forming the array of color filters with a structure adapted for blocking light radiation traveling towards a region between adjacent micro-lens. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A semiconductor device, comprising:
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a substrate having a front surface and a back surface; a plurality of pixels formed on the front surface of the substrate, each pixel being adapted to sense light radiation directed towards the back surface of the substrate; an array of color filters formed over the back surface of the substrate, each color filter being aligned with one of the plurality of pixels for allowing a wavelength of light radiation to pass through to the one of the plurality of pixels; a plurality of micro-lens formed over the array of color filters, each micro-lens being adapted to direct light radiation to each color filter in the array; and a blocking structure disposed between the back surface of the substrate and the plurality of micro-lens, the blocking structure being adapted to block light radiation traveling towards a region between adjacent micro-lens from reaching the pixels. - View Dependent Claims (17, 18, 19, 20)
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Specification