US 2023/0419902 A1 · PIXEL CIRCUIT, DRIVING METHOD THEREOF AND ELECTROLUMINESCENT DISPLAY

Abstract

Embodiments of the present application provide a pixel circuit, a driving method thereof, and a display device. The pixel circuit includes a grayscale converter and a current generator, wherein the grayscale converter is configured to receive a first data voltage and a second data voltage and correspondingly generate a grayscale voltage. Meanwhile, the grayscale voltage is changed by a ramp voltage to correspondingly control the duration for passing through the driving current, so that the electroluminescent element may emit light with a grayscale corresponding to a main grayscale or a sub-grayscale. In this way, high bit depth can be achieved, real grayscale of the pixel can be presented, the problem of grayscale confusion caused by a small data range can be improved, and the picture quality of the display can be increased.

Claims20

Dependent claims

A pixel circuit comprising:

a current generator configured to pass through a driving current to an electroluminescent element;
and
a grayscale converter configured to receive a first data voltage, a second data voltage, a reference voltage, and a ramp voltage, and change the second data voltage and the first data voltage according to the reference voltage to generate a grayscale voltage correspondingly;
and change the grayscale voltage according to the ramp voltage to control a duration of the driving current passes through the current generator, and drive the electroluminescent element to emit light with a grayscale corresponding to the duration;
wherein the grayscale comprises a main grayscale corresponding to the first data voltage and a sub-grayscale corresponding to the second data voltage, and the sub-grayscale is one of a plurality of sub-grayscales between the main grayscale and a previous grayscale of the main grayscale and between the main grayscale and a next grayscale of the main grayscale.

2 more elements

A driving method for driving a pixel circuit, comprising:

providing a first data voltage and a second data voltage to a grayscale converter to determine a main grayscale and a sub-grayscale, wherein the sub-grayscale is one of a plurality of sub-grayscales between the main grayscale and a previous grayscale of the main grayscale and between the main grayscale and a next grayscale of the main grayscale;
turning on a current generator and applying a light signal to the current generator to pass a driving current to an electroluminescent element;
providing a reference voltage to the grayscale converter to change the second data voltage and the first data voltage and correspondingly generate a grayscale voltage, and
providing a ramp voltage to the grayscale converter to change the grayscale voltage so as to control a duration for passing the driving current, and drive the electroluminescent element to emit light with the main grayscale or the sub-grayscale corresponding to the duration.

1 more element

Dependencies are inferred from the claim text.

Pixel circuit, driving method thereof and electroluminescent display

Life of this patent

Pixel circuit, driving method thereof and electroluminescent display

Life of this patent

Abstract

Claims20