Differential VCOM resistance or capacitance tuning for improved image quality
First Claim
Patent Images
1. An electronic display comprising:
- a first pixel comprising a first common voltage layer (VCOM layer), wherein the first VCOM layer is configured to experience a first voltage perturbation in response to a pixel deactivation signal;
a second pixel comprising a second VCOM layer, wherein the second VCOM layer is configured to experience a second voltage perturbation in response to the pixel deactivation signal; and
a resistive device configured to be coupled to the first VCOM layer during at least a display phase of the electronic display, wherein the resistive device is configured to add resistance to the first VCOM layer so as to cause the first voltage perturbation to substantially match the second voltage perturbation, thereby reducing or eliminating image artifacts due to differences in VCOM layer voltage perturbation.
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Abstract
Devices and methods for reducing a variation in voltage perturbation between common voltage layers (VCOMs) of a display in response to voltage interference are provided. In one example, a resistive element may be coupled to one of several VCOMs to increase the resistance value of the VCOM. The resistive element may cause a variation in voltage perturbations between the several VCOMs to become generally more uniform, thereby reducing or eliminating certain image artifacts.
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Citations
26 Claims
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1. An electronic display comprising:
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a first pixel comprising a first common voltage layer (VCOM layer), wherein the first VCOM layer is configured to experience a first voltage perturbation in response to a pixel deactivation signal; a second pixel comprising a second VCOM layer, wherein the second VCOM layer is configured to experience a second voltage perturbation in response to the pixel deactivation signal; and a resistive device configured to be coupled to the first VCOM layer during at least a display phase of the electronic display, wherein the resistive device is configured to add resistance to the first VCOM layer so as to cause the first voltage perturbation to substantially match the second voltage perturbation, thereby reducing or eliminating image artifacts due to differences in VCOM layer voltage perturbation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electronic device comprising:
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a processor configured to generate an image signal, wherein the image signal comprises first and second data signals configured to cause two pixels to emit about the same amount of light; and an electronic display configured to display the image signal, wherein the electronic display comprises; a first pixel comprising a first common voltage layer (VCOM layer) that receives voltage from a first VCOM layer voltage supply through a discrete resistive element, capacitive element, or both, wherein the first pixel is configured to emit a first amount of light when programmed with the first data signal; and a second pixel comprising a second VCOM layer receiving voltage from a second VCOM layer voltage supply, wherein the second pixel is configured to emit a second amount of light when programmed with the second data signal; wherein the resistive element, the capacitive element, or both are configured to add to the resistance, capacitance, or both, of the first VCOM layer to cause a first transient voltage dissipation time associated with the first VCOM layer to substantially match a second transient voltage dissipation time associated with a second VCOM layer, such that the first amount of light and the second amount of light are about the same. - View Dependent Claims (8, 9, 10)
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11. An electronic display comprising:
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a plurality of pixels configured to emit light when provided with, some of the pixels being associated with a first common voltage layer (VCOM layer) and some of pixels being associated with a second VCOM layer; and a resistive element, a capacitive element, or both, coupled to the first VCOM layer and configured to add to the resistance, the capacitance, or both of the first VCOM layer to increase a rise time of a transient voltage response of the first VCOM layer, wherein the resistive element, the capacitive element, or both are configured to cause the plurality of pixels to emit substantially the same amount of light when provided the same data signals. - View Dependent Claims (12)
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13. A method comprising:
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coupling a resistive element to a first common voltage layer (VCOM layer) associated with a first set of pixels in an electronic display when the electronic display is in a first state; and decoupling the resistive element from the first VCOM layer when the electronic display is in a second state. - View Dependent Claims (14, 15, 16)
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17. A method, comprising:
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monitoring an electronic display for visual artifacts in response to TFT deactivation; determining if a visual artifact is present in the electronic display; and adjusting a resistance value of a resistance device associated with a common voltage layer (VCOM layer) of the electronic display when a visual artifact is present to reduce or eliminate the visual artifact. - View Dependent Claims (18, 19, 20, 21)
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22. A method of manufacturing an electronic display comprising:
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providing a first common voltage layer (VCOM layer) associated with a row of pixels, wherein the first VCOM layer is configured to experience a first transient voltage when the row of pixels is activated, thereby causing a programmed voltage value of a first group of the pixels to vary by a first voltage difference; providing a second VCOM layer associated with the row of pixels but not electrically connected to the first VCOM layer, wherein the second VCOM layer is configured to experience a second transient voltage when the row of pixels is activated, thereby causing a programmed voltage value of a second group of the pixels to vary by a second voltage difference; and providing a resistive element, a capacitive element, or both coupled to the first VCOM, wherein the resistive element, the capacitive element, or both are configured to cause the first VCOM to dissipate the first transient voltage such that the first voltage difference and the second voltage difference are substantially the same when programmed with the same voltages. - View Dependent Claims (23, 24, 25)
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26. An electronic device comprising:
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a processor configured to generate image signals; and an electronic display configured to display the image signals, the electronic display comprising; a first pixel associated with a first common voltage layer (VCOM layer); a second pixel associated with a second VCOM layer; and a resistive device configured to couple to the first VCOM layer to cause a first transient voltage on the first VCOM layer to dissipate at approximately the same rate as a second transient voltage on the second VCOM layer, thereby reducing or eliminating image artifacts caused by differences in VCOM layer transient voltages.
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Specification