Reference signal generation by reusing the driver circuit
AssigneeSamsung Display Co., Ltd.
InventorsAmir Amirkhany, Younghoon Song, Ranick Ng
Life of this patent
Estimating the term…
Abstract
A display compensation circuit includes a driver circuit including a digital-to-analog converter (DAC), the driver circuit configured to drive pixels of a display panel; and a compensation circuit including a current-mode sensing circuit and a reference current generator circuit, the compensation circuit configured to determine a value to compensate for pixel variations across the display panel, the reference current generator circuit configured to generate a reference current using the DAC of the driver circuit.
Claims20
A display compensation circuit comprising:
- a driver circuit configured to drive pixels of a display panel;
- and
- a compensation circuit comprising a current-mode sensing circuit and a reference current generator circuit,
- wherein the reference current generator circuit is connected to an output terminal of the driver circuit and comprises a capacitor bank, the reference current generator circuit being configured to generate a reference current based on a capacitance value of the capacitor bank and a voltage ramp value of a voltage ramp received from the driver circuit, and
- wherein the current-mode sensing circuit is connected to an output terminal of the reference current generator circuit and configured to generate a signal to compensate for pixel variations across the display panel.
A system comprising a display having a plurality of pixels and a display driver configured to drive the plurality of pixels of the display, the display driver comprising:
- a pixel driver;
- and
- a capacitor bank,
- wherein the pixel driver comprises a multiplexer, a digital logic circuit, and a voltage buffer, wherein:
- the multiplexer is connected to the digital logic circuit at an input terminal of the multiplexer,
- an input terminal of the voltage buffer is connected to an output terminal of the multiplexer, and
- an input terminal of the capacitor bank is connected to an output terminal of the voltage buffer, wherein the capacitor bank is configured to generate a reference current to compensate characteristics of a pixel of the display based on a capacitance value of the capacitor bank and a voltage ramp value of a voltage ramp at the output terminal of the voltage buffer.
A method for generating a reference current to compensate characteristics of a pixel of a display, the method comprising:
- generating a voltage ramp at an output terminal of a driving amplifier of a pixel driver, wherein the driving amplifier is configured to receive an input from a multiplexer and a digital logic circuit of the pixel driver and generate the voltage ramp based on the input received from the multiplexer and the digital logic circuit;
- performing multiplication of a value of the voltage ramp and a capacitance value of a capacitor bank connected at the output terminal of the driving amplifier;
- and
- generating the reference current at an output terminal of the capacitor bank to compensate mobility and voltage threshold characteristics of the pixel of the display.
Dependencies are inferred from the claim text.