Noise reduction in led sensing circuit for electronic display

A circuit, comprising:

• a voltage source configured to output a first ramp digital-to-analog converter (DAC) voltage signal and a second DAC voltage signal;
• a comparator component configured to receive the first and second ramp DAC voltage signals and change states when either the first or second ramp DAC voltage signal crosses a threshold voltage;
• a counter configured to provide a plurality of count values that corresponds to a plurality of voltage steps of the first and second ramp DAC voltage signals;
• and
• a controller configured to:
• determine a range of voltages of the first ramp DAC voltage signal that corresponds to when the comparator component changes states when receiving the first ramp DAC voltage signal;
• send a command to the comparator component to activate during the range of voltages when the comparator component receives the second ramp DAC voltage signal;
• determine a voltage that corresponds to when the comparator component changes states with respect to the second ramp DAC voltage signal based on a count value of the plurality of count values, wherein the count value is associated with when the comparator component changes states with respect to the second ramp DAC voltage signal;
• and
• calibrate a pixel of a display device based on the voltage.

A system, comprising:

• a display comprising a plurality of pixels, wherein the display is configured to render image data;
• a current source configured to output a current;
• a comparator component configured to receive the current, wherein the current is configured to charge a capacitor coupled across the comparator component, and wherein the comparator component is configured to change states when a voltage signal output by the capacitor crosses a first threshold voltage or a second threshold voltage;
• and
• a controller configured to:
• receive a first time at which the comparator component changes states based on the voltage signal;
• receive a second time at which the comparator component changes states based on the voltage signal;
• determine a current value based on the first time and the second time;
• and
• calibrate a pixel of the plurality of pixels based on the current value.

A method, comprising:

• receiving, via a processor, a plurality of time values associated with a plurality of times in which a comparator component changes states due to an input voltage signal crossing a threshold voltage;
• determining, via the processor, an average value of the plurality of time values;
• determining, via the processor, a voltage value of the input voltage signal that corresponds to the threshold voltage based on the average value;
• and
• calibrating, via the processor, a pixel of a plurality of pixels within a display device based on the voltage value.

An electronic device, comprising:

• a display panel comprising a plurality of pixels configured to display image data;
• and
• a voltage source configured to output a first ramp digital-to-analog converter (DAC) voltage signal and a second DAC voltage signal;
• a comparator component configured to receive first and second ramp DAC voltage signals and change states when either the first or second ramp DAC voltage signal crosses a threshold voltage;
• a counter configured to provide a plurality of count values that corresponds to a plurality of voltage steps of the first and second ramp DAC voltage signals;
• and
• a controller configured to:
• determine a range of voltages of the first ramp DAC voltage signal that corresponds to when the comparator component changes states when receiving the first ramp DAC voltage signal;
• send a command to the comparator component to activate during the range of voltages when the comparator component receives the second ramp DAC voltage signal;
• determine a voltage that corresponds to when the comparator component changes states with respect to the second ramp DAC voltage signal based on a count value of the plurality of count values, wherein the count value is associated with when the comparator component changes states with respect to the second ramp DAC voltage signal;
• and
• calibrate a pixel of a display device based on the voltage.