Back to results
US 11,081,032 B2Granted
Display circuitry and method to utilize segmented resistors for optimizing front of screen performance
AssigneeApple Inc.
InventorsFenghua Zheng, Shatam Agarwal
Life of this patent
Estimating the term…
Abstract
Aspects of the subject technology relate to control circuitry for displays. A display control circuitry includes a plurality of amplifiers to drive gamma signals for a pixel array having a plurality of pixels of a display and a segmented resistor string coupled to the plurality of amplifiers. The resistor string includes a plurality of resistor segments with a resistor segment being designed with a modified resistance to modify display performance parameters including at least one of a settling time of an associated gamma signal, a power supply rejection ratio (PSRR) of an amplifier of the plurality of amplifiers, or an output voltage offset of an amplifier of the plurality of amplifiers.
Claims20
A display control circuitry, comprising:
- a plurality of amplifiers to drive gamma signals for a pixel array having a plurality of pixels of a display;
- a segmented resistor string coupled to an output of an amplifier of the plurality of amplifiers;
- and
- processing circuitry configured to determine whether any display performance parameter is out of an electrical specification, to determine a resistor segment of the segmented resistor string that corresponds with the display performance parameter being out of the electrical specification, and to modify a total resistance for the resistor segment of the segmented resistor string while maintaining a resistance ratio for resistors within the resistor segment to modify a display performance parameter including at least one of a settling time of an associated output gamma signal of the amplifier, a power supply rejection ratio (PSRR) of the amplifier to indicate an ability to suppress power supply variations, or an output voltage offset of the amplifier that is caused by mismatching from input terminals of the amplifier.
1 more element
An electronic device having a display, the electronic device comprising:
- display control circuitry to control operations of the display;
- and
- column driver circuitry coupled to the display control circuitry, wherein the column driver circuitry comprises a plurality of amplifiers to drive gamma signals for a pixel array having a plurality of pixels of the display and a segmented resistor string coupled to an output of an amplifier of the plurality of amplifiers, wherein the display control circuitry is configured to determine whether any display performance parameter is out of an electrical specification, to determine a resistor segment of the segmented resistor string that corresponds with the display performance parameter being out of the electrical specification, and to modify a total resistance for the resistor segment of the segmented resistor string while maintaining a resistance ratio for resistors within the resistor segment to modify a display performance parameter including at least one of a settling time of an associated output gamma signal of the amplifier, a power supply rejection ratio (PSRR) of the amplifier to indicate an ability to suppress power supply variations, or an output voltage offset of the amplifier that is caused by mismatching from input terminals of the amplifier.
A display driver circuitry, comprising:
- a gamma unit to generate a gamma curve for a mapping of luminance to grey level for a display, wherein the gamma unit includes a plurality of amplifiers to drive gamma signals for a pixel array having a plurality of pixels of a display and a segmented resistor string coupled to an output of an amplifier of the plurality of amplifiers;
- and
- processing circuitry coupled to the gamma unit, the processing circuitry is configured to determine whether any display performance parameter is out of an electrical specification, to determine a resistor segment of the segmented resistor string that corresponds with the display performance parameter being out of the electrical specification, and to modify a total resistance for the resistor segment of the segmented resistor string while maintaining a resistance ratio for resistors within the resistor segment to modify a display performance parameter including at least one of a settling time of an associated output gamma signal of the amplifier, a power supply rejection ratio (PSRR) of the amplifier to indicate an ability to suppress power supply variations, or an output voltage offset of the amplifier that is caused by mismatching from input terminals of the amplifier.
A computer implemented method for a display, comprising:
- monitoring, with processing circuitry, display performance parameters of the display;
- determining, with the processing circuitry, whether any display performance parameter including at least one of a settling time of an associated gamma signal, a power supply rejection ratio (PSRR) of an amplifier, or an output voltage offset of an amplifier is out of an electrical specification;
- determining a resistor segment of a segmented resistor string of a gamma unit that corresponds with the display performance parameter being out of the electrical specification;
- and
- modifying a total resistance for the resistor segment of the segmented resistor string of the gamma unit while maintaining a resistance ratio for resistors within the resistor segment to modify a display performance parameter including at least one of a settling time of an associated gamma signal, a power supply rejection ratio (PSRR) of an amplifier of the gamma unit, or an output voltage offset of an amplifier of the gamma unit.
2 more elements
Dependencies are inferred from the claim text.