Displays with Circuitry for Compensating Parasitic Coupling Effects
First Claim
1. A display comprising:
- an array of display pixels controlled by data lines and gate lines, wherein each display pixel in the array of display pixels has an associated display pixel electrode and wherein the array of display pixels share a common electrode; and
common electrode compensation circuitry configured to reduce voltage rippling on the common electrode, wherein the common electrode compensation circuitry is coupled to the common electrode via a near-field electromagnetic coupling structure.
1 Assignment
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Accused Products
Abstract
An electronic device may have a display such as a liquid crystal display. The display may have a color filter layer and a thin-film transistor (TFT) layer. An active portion of the display may contain an array of display pixels that are controlled by control signals that are provided over intersecting gate lines and data lines. In an inactive portion of the display, display driver circuitry may be used to provide data signals for the data lines. Each display pixel may be coupled to a corresponding gate line, data line, and may share a common electrode. Changes in the data signals may be coupled onto the common electrode to cause voltage rippling. Compensation circuitry may be coupled to the common electrode via an AC or a DC coupling connection to help reduce the voltage rippling.
34 Citations
24 Claims
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1. A display comprising:
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an array of display pixels controlled by data lines and gate lines, wherein each display pixel in the array of display pixels has an associated display pixel electrode and wherein the array of display pixels share a common electrode; and common electrode compensation circuitry configured to reduce voltage rippling on the common electrode, wherein the common electrode compensation circuitry is coupled to the common electrode via a near-field electromagnetic coupling structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A display comprising:
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an array of display pixels controlled by data lines and gate lines, wherein each display pixel in the array of display pixels has an associated display pixel electrode and wherein the array of display pixels share a common electrode; and common electrode compensation circuitry configured to reduce voltage rippling on the common electrode, wherein the common electrode compensation circuitry includes an input that is coupled to the common electrode via a feedback path, an output that is coupled to the common electrode via an output path, and an impedance isolation circuit that is interposed in the feedback path. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of operating a display having a plurality of display pixels that are controlled by data lines and gate lines, wherein each display pixel in the array of display pixels has an associated display pixel electrode and wherein the array of display pixels share a common electrode, the method comprising:
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applying data signals on the data lines; in response to applying the data signals on the data lines, receiving a feedback signal from the common electrode with common electrode compensation circuitry via an impedance isolation circuit; and with the common electrode compensation circuitry, driving the common electrode to reduce voltage rippling on the common electrode. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification