LIQUID CRYSTAL DISPLAY USING DEPLETION-MODE TRANSISTORS
First Claim
1. A method for reducing visual artifacts in a display, comprising:
- turning off the display; and
in response to turning off the display;
connecting a pixel electrode of the pixel of the display to ground; and
maintaining the connection of the pixel electrode of the pixel of the display to ground while the display is off;
wherein a common electrode of the pixel of the display has a voltage of substantially ground when the display is turned off.
1 Assignment
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Accused Products
Abstract
Methods and devices employing charge removal circuitry are provided to reduce or eliminate artifacts due to a bias voltage remaining on an electronic display after the display is turned off. In one example, a method may include connecting a pixel electrode of a display to ground through charge removal circuitry while the display is off (e.g., using depletion-mode transistors that are active when gates of the depletion-mode transistors are provided a ground voltage). When a corresponding common electrode is also connected to ground, a voltage difference between the pixel electrode and common electrode may be reduced or eliminated, preventing a bias voltage from causing display artifacts in the pixel.
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Citations
26 Claims
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1. A method for reducing visual artifacts in a display, comprising:
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turning off the display; and in response to turning off the display; connecting a pixel electrode of the pixel of the display to ground; and maintaining the connection of the pixel electrode of the pixel of the display to ground while the display is off; wherein a common electrode of the pixel of the display has a voltage of substantially ground when the display is turned off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electronic display comprising:
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a plurality of pixels, each pixel having a common electrode and a pixel electrode; a common voltage source configured to supply a common voltage to the common electrodes of the pixels; a gate driver configured to supply activation signals to the pixels to activate the pixels; a source driver configured to supply data signals to the pixel electrodes when the pixels are activated; and charge removal circuitry configured to connect each pixel electrode to ground while the electronic display is turned off. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An electronic device comprising:
an electronic display comprising; a plurality of pixels, each pixel comprising; a pixel electrode; and a depletion-mode thin film transistor that controls access to the pixel electrode; and charge removal circuitry comprising a plurality of depletion-mode transistors configured to connect the pixel electrodes to ground while the electronic display is turned off. - View Dependent Claims (18, 19)
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20. A method for manufacturing an electronic display, the method comprising:
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forming a plurality of enhancement mode transistors in a semiconductor substrate; masking the first plurality of enhancement mode transistors; and forming a plurality of depletion-mode transistors in the semiconductor substrate. - View Dependent Claims (21, 22)
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23. A pixel array of an electronic display comprising:
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charge removal circuitry comprising charge removal depletion-mode transistors configured to connect to ground while the electronic display is off; and an active area of the electronic display comprises a plurality of unit pixels each having a pixel electrode and a depletion-mode access transistor, wherein the depletion-mode access transistor is configured to electrically connect the pixel electrode to a data line while the electronic display is off, and wherein each data line is configured to electrically connect to ground while the electronic display is off via the charge removal depletion-mode transistors connected to ground while the electronic display is off. - View Dependent Claims (24, 25)
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26. An electronic display comprising:
a pixel comprising a depletion-mode thin-film-transistor.
Specification