US-12626627-B1 - Display driver for modulating initial voltages of pixel circuit and operating method thereof

US12626627B1US 12626627 B1US12626627 B1US 12626627B1US-12626627-B1

Abstract

A display driver and an operating method thereof, and a display panel are disclosed. The operating method includes the following steps. The display panel includes a plurality of pixel circuits arranged in an array. By the display driver, an initial voltage with a reference value is provided to the plurality of pixel circuits during at least one active frame. By the display driver, the initial voltage with a plurality of different voltage values is provided to the plurality of pixel circuits during at least one skip frame. The plurality of different voltage values of the initial voltage respectively correspond to a plurality of distances between the plurality of display lines and the display driver.

Inventors

YU-LUN HSIEH
Chang-Sheng TSENG

Assignees

NOVATEK MICROELECTRONICS CORP.

Dates

Publication Date: 20260512
Application Date: 20241127

Claims (12)

1 . An operating method of a display driver, for driving a display panel which comprises a plurality of pixel circuits arranged in a plurality of display lines, comprising: providing, by the display driver, an initial voltage that drives the display panel with a reference value to the plurality of pixel circuits, during at least one active frame; and providing, by the display driver, the initial voltage with a plurality of different voltage values to the plurality of pixel circuits to drive the display panel, during at least one skip frame, wherein the plurality of different voltage values of the initial voltage respectively correspond to a plurality of distances between the plurality of display lines and the display driver, wherein the plurality of different voltage values of plurality of different voltage values of the initial voltage respectively correspond to a plurality of distances between the plurality of display lines and the display driver are not driving the display panel during the active frame.
2 . The operating method according to claim 1 , wherein absolute values of the plurality of different voltage values of the initial voltage and the plurality of distances between the plurality of display lines and the display driver have a positive correlation.
3 . The operating method according to claim 1 , wherein providing the initial voltage with the plurality of different voltage values to the plurality of pixel circuits during the at least one skip frame comprises: providing, by the display driver, the initial voltage with a first voltage value to a first pixel circuit of the plurality of pixel circuits, during the at least one skip frame; and providing, by the display driver, the initial voltage with a second voltage value to a second pixel circuit of the plurality of pixel circuits, during the at least one skip frame, wherein the first pixel circuit and the second pixel circuit are arranged in the same column and different rows.
4 . The operating method according to claim 3 , wherein an absolute value of the first voltage value corresponding to a first display line of the plurality of display lines is greater than an absolute value of the second voltage value corresponding to a second display line of the plurality of display lines, wherein a first distance between the first display line and the display driver is greater than a second distance between the second display line and the display driver.
5 . The operating method according to claim 1 , wherein among an operating period of the display driver, a number of the at least one active frame is plural, and a number of the at least one skip frame is one, wherein the skip frame is between the plurality of active frames.
6 . The operating method according to claim 1 , wherein among an operating period of the display driver, a number of the at least one active frame is one, and a number of the at least one skip frame is plural, wherein the plurality of skip frames are continuous and after the active frame.
7 . The operating method according to claim 1 , further comprising: providing, by the display driver, the initial voltage with the reference voltage to first pixel circuits of the plurality of pixel circuits corresponding to first display lines of the plurality of display lines, during at least one split-screen active frame; refreshing, by the display driver, a first part of the display screen corresponding to the first pixel circuits according to the initial voltage with the reference value and a plurality of controlling signals, during the at least one split-screen active frame; and providing, by the display driver, the initial voltage with a plurality of different split-values to the first pixel circuits, during at least one split-screen skip frame, wherein the plurality of different split-values of the initial voltage respectively correspond to the plurality of distances between the plurality of display lines and the display driver.
8 . The operating method according to claim 7 , wherein among an operating period of the display driver, a number of the at least one split-screen active frame is one, and a number of the at least one split-screen skip frame is plural, wherein the split-screen active frame is between the plurality of split-screen skip frames.
9 . The operating method according to claim 8 , wherein among the operating period of the display driver, a number of the at least one active frame is one, and a number of the at least one skip frame is one, wherein the skip frame is after the plurality of split-screen skip frames, and is before the active frame.
10 . The operating method according to claim 1 , wherein the initial voltage with the plurality of different voltage values comprises stepped voltage values.
11 . A display driver, comprising: a digital-to-analog converter (DAC), configured to generate an initial voltage with a reference value, and to generate the initial voltage that drives the display panel with a plurality of different voltage values according to a plurality of distances between a plurality of display lines and the display driver; and an output stage circuit, coupled to the DAC and a plurality of pixel circuits arranged in the plurality of display lines, and configured to output the initial voltage with the reference voltage value to the plurality of pixel circuits, during at least one active frame, and to output the initial voltage with the plurality of different voltage values to the plurality of pixel circuits to drive the display panel during at least one skip frame, wherein the plurality of different voltage values of plurality of different voltage values of the initial voltage respectively correspond to a plurality of distances between the plurality of display lines and the display driver are not driving the display panel during the active frame.
12 . A display panel, comprising: a plurality of pixel circuits arranged in a plurality of display lines; a digital-to-analog converter (DAC), configured to generate an initial voltage with a reference value, and to generate the initial voltage that drives the display panel with a plurality of different voltage values according to a plurality of distances between a plurality of display lines and the display driver; and an output stage circuit, coupled to the DAC and the plurality of pixel circuits, and configured to output the initial voltage with the reference voltage value to the plurality of pixel circuits during at least one active frame, and to output the initial voltage with the plurality of different voltage values to the plurality of pixel circuits to drive the display panel during at least one skip frame, wherein the plurality of different voltage values of plurality of different voltage values of the initial voltage respectively correspond to a plurality of distances between the plurality of display lines and the display driver are not driving the display panel during the active frame.

Description

BACKGROUND Technical Field This disclosure relates to an electronic device, and in particular to a display driver, an operating method thereof and a display panel. Description of Related Art In general, the display driver is adapted to drive the display panel. FIG. 1 is a schematic diagram of operations of a display driver according to related arts. In FIG. 1, the horizontal axis represents the operation time of the current display driver, and the vertical axis represents the voltage value. Referring to FIG. 1, during the frames FAV and FSK, the current display driver provides signals (for example, including the voltage Vini_P1 or Vini_P2) to the display panel, for driving the pixel circuits of the display panel. However, since the provided signals have different voltage values, the coupled voltages and the hysteresis characteristics of the pixel circuits affect the working nodes therebetween. Such that, the flicker problem happens in the display panel. SUMMARY Embodiments of the disclosure provide an operating method of a display driver, capable of reducing the flicker problem a display panel. The operating method of the embodiment of the disclosure is for driving a display panel, and includes the following steps. The display panel includes a plurality of pixel circuits. The pixel circuits are arranged in an array. By the display driver, an initial voltage with a reference value is provided to the plurality of pixel circuits during at least one active frame. By the display driver, the initial voltage with a plurality of different voltage values is provided to the plurality of pixel circuits during at least one skip frame. The plurality of different voltage values of the initial voltage respectively correspond to a plurality of distances between the plurality of display lines and the display driver. The embodiment of the disclosure further provides a display driver. The display driver includes a digital-to-analog converter (DAC) and an output stage circuit. The bias voltage controller is coupled to the timing controller and a display panel. The DAC is configured to generate an initial voltage with a reference value, and to generate the initial voltage with a plurality of different voltage values according to a plurality of distances between a plurality of display lines and the display driver. The output stage circuit is coupled to the DAC and a plurality of pixel circuits arranged in the plurality of display lines. The output stage circuit is configured to output the initial voltage with the reference voltage value to the plurality of pixel circuits during at least one active frame, and to output the initial voltage with the plurality of different voltage values to the plurality of pixel circuits during at least one skip frame. The embodiment of the disclosure further provides a display panel. The display panel includes a plurality of pixel circuits, a DAC and an output stage circuit. The pixel circuits are arranged in an array. The DAC is configured to generate an initial voltage with a reference value, and to generate the initial voltage with a plurality of different voltage values according to a plurality of distances between a plurality of display lines and the display driver. The output stage circuit is coupled to the DAC and the plurality of pixel circuits. The output stage circuit is configured to output the initial voltage with the reference voltage value to the plurality of pixel circuits during at least one active frame, and to output the initial voltage with the plurality of different voltage values to the plurality of pixel circuits during at least one skip frame. Based on the above, in the display driver and the operating method thereof, and the display panel of the embodiment of the disclosure, by providing the initial voltage with different voltage values to the pixel circuits corresponding to various display lines, these different voltage values are compensated to the corresponding pixel circuits at various regions. As such, during the skip frame, the display driver is capable of reducing voltage differences affected to the pixel circuits, so as to reduce the flicker and to improve the uniformity of the display screen. To make the aforementioned more comprehensible, several embodiments accompanied with drawings are described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate example embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure. FIG. 1 is a schematic diagram of operations of a display driver according to related arts. FIG. 2 is a circuit block diagram of a display panel according to an embodiment of the disclosure. FIG. 3 is a flow chart of an operating method of the display driver according to an embodiment of the disclosure. FIG. 4 i