Active matrix display devices
First Claim
Patent Images
1. An active matrix display device comprising:
- a plurality of pixels arranged as rows and columns, and column electrodes extending along corresponding columns of pixels, wherein;
each pixel of the plurality of pixels includes;
an image data storage capacitance, and a read circuit for reading a state of the image data storage capacitance, and for driving a corresponding column electrode of the column electrodes in accordance with the state of the image data storage capacitance, and the read circuit has an input impedance that is sufficiently high that charge stored on the image data storage capacitance is not significantly discharged during reading.
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Abstract
An active matrix display device includes a plurality of pixels (10) arranged as rows and columns and column electrodes (16) extending along corresponding columns of pixels (10). The pixels include a capacitance (18,70) for storing image data and a read circuit for reading the charge stored on the capacitance (18,70) and driving the column electrode with the read charge.
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Citations
16 Claims
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1. An active matrix display device comprising:
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a plurality of pixels arranged as rows and columns, and column electrodes extending along corresponding columns of pixels, wherein;
each pixel of the plurality of pixels includes;
an image data storage capacitance, and a read circuit for reading a state of the image data storage capacitance, and for driving a corresponding column electrode of the column electrodes in accordance with the state of the image data storage capacitance, and the read circuit has an input impedance that is sufficiently high that charge stored on the image data storage capacitance is not significantly discharged during reading. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An active matrix display device comprising:
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a plurality of pixels arranged as rows and columns; and
column electrodes extending along corresponding columns of pixels;
wherein the pixels include;
a plurality of image data storage capacitances, and a dedicated read circuit connected to each image data storage capacitor for reading a state of the image data storage capacitance and for driving the corresponding column electrode in accordance with the state of the image data storage capacitance. - View Dependent Claims (10)
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11. A method of operating an active matrix display device having pixel elements including storage nodes, comprising:
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storing image data on the storage nodes, operating the active matrix device in a static mode including;
displaying the stored image data, and periodically applying read signals to read circuitry within the pixel elements to cause the read circuitry to read the stored image data to column electrodes, and refreshing the image data stored on the storage nodes, wherein refreshing the image data includes alternating the polarity of the image data stored on the storage nodes. - View Dependent Claims (12, 13)
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14. A method of operating an active matrix display device having a plurality of pixels that each include at least one read element, and one or more storage elements that facilitate storage of a range of grey scale values corresponding to an image data value of the pixel, the method comprising:
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enabling the at least one read element of a pixel, to thereby provide a grey scale value of the pixel to a set of one or more column electrodes associated with the pixel, and refreshing the image data value to the one or more storage elements of the pixel, wherein enabling the one or more read elements includes applying multiple read signals to read each of the multiple storage elements, thereby facilitating reading of a grey scale value of the stored image data. - View Dependent Claims (15)
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16. An active matrix display device comprising:
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a plurality of pixels arranged as rows and columns; and
column electrodes extending along corresponding columns of pixels;
wherein each pixel of the plurality of pixels includes a plurality of image data storage capacitances that are configured to store an image data value corresponding to a multi-bit grey scale value of corresponding image data, each of the plurality of image storage capacitances corresponding to a bit of the multi-bit grey scale value of the stored image data, and a corresponding read circuit for each of the image data storage capacitances for reading the grey scale value of the image data and for driving one or more corresponding column electrodes in accordance with the image data value.
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Specification