US 12,603,061 B1 · Display with backlight dithering

Abstract

An electronic device is provided that includes display pixels configured to update at a fixed or variable refresh rate, a backlight unit for illuminating the display pixels, and associated backlight driver circuitry configured to drive the backlight unit and configured to operate in a first reset mode during which a dither counter in the backlight driver circuitry is reset when the display pixels are being refreshed at a fixed refresh rate and in a second non-reset mode during which the dither counter is not reset even when the display pixels are being refreshed at a variable refresh rate. The backlight driver circuitry can include a brightness controller configured to output a brightness code, a memory circuit configured to store a dither table coupled to a dither counter, an adder, a clipping circuit, and a backlight driver.

Claims18

Dependent claims

A display comprising:

a pixel array;
a backlight unit having an array of light-emitting elements configured to illuminate the pixel array;
a brightness controller configured to output a brightness code;
a memory circuit configured to store a dither table that is addressed using a number of least significant bits (LSBs) of the brightness code output from the brightness controller;
a backlight driver configured to output signals for controlling the array of light-emitting elements in the backlight unit based on the brightness code and a value output from the dither table;
and
a counter configured to output a count value for addressing the dither table.

4 more elements

Dependencies are inferred from the claim text.

Display with backlight dithering

Life of this patent

Display with backlight dithering

Life of this patent

Abstract

Claims18