Defective pixel specifying method, defective pixel specifying system, image correcting method, and image correcting system
First Claim
1. A method of driving a device comprising a pixel portion having a plurality of pixels each comprising a photoelectric conversion element and a display element, comprising the steps of:
- reading a first calibration sheet to obtain a first image signal of each of the plurality of pixels by using the photoelectric conversion element;
reading a second calibration sheet to obtain a second image signal of each of the plurality of pixels by using the photoelectric conversion element;
calculating a first difference between the first and second image signals of each of the plurality of pixels;
obtaining at least a value selected from a modal value, an average value and a maximum value of the first difference of each of the plurality of pixels;
determining whether each of the plurality of pixels is a defective pixel by obtaining a second difference between the first difference of each of the plurality of pixels and the value of selected from a modal value, an average value and a maximum value of the first difference of the plurality of pixels; and
displaying a third image by using the display element,wherein the step of reading the first calibration sheet, the step of reading the second calibration sheet, and the step of displaying the third image are performed using the pixel portion.
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Abstract
A defective pixel specifying method and a defective pixel specifying system for a semiconductor device having a defective pixel are provided. Also provided are an image correcting method and an image correcting system for making a defective pixel inconspicuous on the screen when a read image is displayed. The present invention determines whether or not there is a defective pixel for each pixel and specifies the coordinate of the defective pixel using image signals obtained by reading a plurality of images. The image signal of the defective pixel is set based on the image signals of the pixels adjacent to the defective pixel to correct the image of the subject read.
61 Citations
34 Claims
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1. A method of driving a device comprising a pixel portion having a plurality of pixels each comprising a photoelectric conversion element and a display element, comprising the steps of:
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reading a first calibration sheet to obtain a first image signal of each of the plurality of pixels by using the photoelectric conversion element; reading a second calibration sheet to obtain a second image signal of each of the plurality of pixels by using the photoelectric conversion element; calculating a first difference between the first and second image signals of each of the plurality of pixels; obtaining at least a value selected from a modal value, an average value and a maximum value of the first difference of each of the plurality of pixels; determining whether each of the plurality of pixels is a defective pixel by obtaining a second difference between the first difference of each of the plurality of pixels and the value of selected from a modal value, an average value and a maximum value of the first difference of the plurality of pixels; and displaying a third image by using the display element, wherein the step of reading the first calibration sheet, the step of reading the second calibration sheet, and the step of displaying the third image are performed using the pixel portion. - View Dependent Claims (3, 11, 19, 27)
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2. A method of driving a device comprising a pixel portion having a plurality of pixels each comprising a photoelectric conversion element and a display element, comprising the steps of:
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reading a first calibration sheet to obtain a first image signal of each of the plurality of pixels by using the photoelectric conversion element; reading a second calibration sheet to obtain a second image signal of each of the plurality of pixels by using the photoelectric conversion element; calculating a first ratio between the first and second image signals of each of the plurality of pixels; obtaining at least a value selected from a modal value, an average value and a maximum value of the first ratio of the plurality of pixels; determining whether each of the plurality of pixels is a defective pixel by obtaining a second ratio between the first ratio of the plurality of pixels and the value selected from a modal value, an average value and a maximum value of the first ratio of the plurality of pixels; and displaying a third image by using the display element, wherein the step of reading the first calibration sheet, the step of reading the second calibration sheet, and the step of displaying the third image are performed using the pixel portion. - View Dependent Claims (4, 12, 20, 28)
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5. A method of driving a device comprising a pixel portion having a plurality of pixels each comprising a photoelectric conversion element and a display element, comprising the steps of:
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obtaining a first image signal of each of the plurality of pixels by using the photoelectric conversion element; reading a calibration sheet to obtain a second image signal of each of the plurality of pixels by using the photoelectric conversion element; calculating a first difference between the first and second image signals of each of the plurality of pixels; obtaining at least a value selected from a modal value, an average value and a maximum value of the first difference of each of the plurality of pixels; determining whether each of the plurality of pixels is a defective pixel by obtaining a second difference between the first difference of each of the plurality of pixels and the value of selected from a modal value, an average value and a maximum value of the first difference of the plurality of pixels; and displaying a third image by using the display element, wherein the first image signal of each of the plurality of pixels is obtained while T>
{C×
Vp/Id} is satisfied, where T is an accumulation time, C is a capacitance of the photoelectric conversion element, Vp is a voltage applied to the photoelectric conversion element, andwherein the step of obtaining the first image signal, the step of reading the calibration sheet, and the step of displaying the third image are performed using the pixel portion. - View Dependent Claims (13, 21, 29)
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6. A method of driving a device comprising a pixel portion having a plurality of pixels each comprising a photoelectric conversion element and a display element, comprising the steps of:
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obtaining a first image signal of each of the plurality of pixels by using the photoelectric conversion element; reading a calibration sheet to obtain a second image signal of each of the plurality of pixels by using the photoelectric conversion element; calculating a first ratio between the first and second image signals of each of the plurality of pixels; obtaining at least a value selected from a modal value, an average value and a maximum value of the first ratio of the plurality of pixels; determining whether each of the plurality of pixels is a defective pixel by obtaining a second ratio between the first ratio of the plurality of pixels and the value selected from a modal value, an average value and a maximum value of the first ratio of the plurality of pixels; and displaying a third image by using the display element, wherein the first image signal of each of the plurality of pixels is obtained while T>
{C×
Vp/Id} is satisfied, where T is an accumulation time, C is a capacitance of the photoelectric conversion element, Vp is a voltage applied to the photoelectric conversion element, andwherein the step of obtaining the first image signal, the step of reading the calibration sheet, and the step of displaying the third image are performed using the pixel portion. - View Dependent Claims (14, 22, 30)
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7. A method of driving a device comprising a pixel portion having a plurality of pixels each comprising a photoelectric conversion element and a display element, comprising the steps of:
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obtaining a first image signal of each of the plurality of pixels by using the photoelectric conversion element; reading a calibration sheet to obtain a second image signal of each of the plurality of pixels by using the photoelectric conversion element; calculating a first difference between the first and second image signals of each of the plurality of pixels; obtaining at least a value selected from a modal value, an average value and a maximum value of the first difference of the plurality of pixels; determining whether each of the plurality of pixels is a defective pixel by obtaining a second difference between the first difference of the plurality of pixels and the value selected from a modal value, an average value and a maximum value of the first difference of the plurality of pixels; and displaying a third image by using the display element, wherein the first image signal of each of the plurality of pixels is obtained while an accumulation time of the photoelectric conversion element is 0, and wherein the step of obtaining the first image signal, the step of reading the calibration sheet, and the step of displaying the third image are performed using the pixel portion. - View Dependent Claims (15, 23, 31)
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8. A method of driving a device comprising a pixel portion having a plurality of pixels each comprising a photoelectric conversion element and a display element, comprising the steps of:
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obtaining a first image signal of each of the plurality of pixels by using the photoelectric conversion element; reading a calibration sheet to obtain a second image signal of each of the plurality of pixels by using the photoelectric conversion element; calculating a first ratio between the first and second image signals of each of the plurality of pixels; obtaining at least a value selected from a modal value, an average value and a maximum value of the first ratio of the plurality of pixels; determining whether each of the plurality of pixels is a defective pixel by obtaining a second ratio between the first ratio of the plurality of pixels and the value selected from a modal value, an average value and a maximum value of the first ratio of the plurality of pixels; and displaying a third image by using the display element, wherein the first image signal of each of the plurality of pixels is obtained while an accumulation time of the photoelectric conversion element is 0, and wherein the step of obtaining the first image signal, the step of reading the calibration sheet, and the step of displaying the third image are performed using the pixel portion. - View Dependent Claims (16, 24, 32)
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9. A method of driving a device comprising a pixel portion having a plurality of pixels each comprising a photoelectric conversion element and a display element, comprising the steps of:
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obtaining a first image signal of each of the plurality of pixels by using the photoelectric conversion element; obtaining a second image signal of each of the plurality of pixels by using the photoelectric conversion element; calculating a first difference between the first and second image signals of each of the plurality of pixels; obtaining at least a value selected from a modal value, an average value and a maximum value of the first difference of the plurality of pixels; determining whether each of the plurality of pixels is a defective pixel by obtaining a second difference between the first difference of the plurality of pixels and the value selected from a modal value, an average value and a maximum value of the first difference of the plurality of pixels; and displaying a third image by using the display element, wherein the first image signal of each of the plurality of pixels is obtained while T>
{C×
Vp/Id} is satisfied, where T is an accumulation time, C is a capacitance of the photoelectric conversion element, Vp is a voltage applied to the photoelectric conversion element,wherein the second image signal of each of the plurality of pixels is obtained while an accumulation time of the photoelectric conversion element is 0, and wherein the step of obtaining the first image signal, the step of obtaining the second image signal, and the step of displaying the third image are performed using the pixel portion. - View Dependent Claims (17, 25, 33)
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10. A method of driving a device comprising a pixel portion having a plurality of pixels each comprising a photoelectric conversion element and a display element, comprising the steps of:
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obtaining a first image signal of each of the plurality of pixels by using the photoelectric conversion element; obtaining a second image signal of each of the plurality of pixels by using the photoelectric conversion element; calculating a first ratio between the first and second image signals of each of the plurality of pixels; obtaining at least a value selected from a modal value, an average value and a maximum value of the first ratio of the plurality of pixels; determining whether each of the plurality of pixels is a defective pixel by obtaining a second ratio between the first ratio of the plurality of pixels and the value selected from a modal value, an average value and a maximum value of the first ratio of the plurality of pixels; and displaying a third image by using the display element, wherein the first image signal of each of the plurality of pixels is obtained while T>
{C×
Vp/Id} is satisfied, where T is an accumulation time, C is a capacitance of the photoelectric conversion element, Vp is a voltage applied to the photoelectric conversion element,wherein the second image signal of each of the plurality of pixels is obtained while an accumulation time of the photoelectric conversion element is 0, and wherein the step of obtaining the first image signal, the step of obtaining the second image signal, and the step of displaying the third image are performed using the pixel portion. - View Dependent Claims (18, 26, 34)
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Specification