Display screen rate conversion method and terminal

A display screen rate conversion method, applied to a display driver integrated circuit (DDIC) chip of an organic light-emitting diode (OLED) display screen, comprising:

• initializing display screen parameters according to a first refresh rate;
• in response to receiving first image data sent by an application processor (AP), performing an image scanning according to the first refresh rate, comprising:
• generating a vertical synchronous signal (Vsync) according to the VFP corresponding to the first refresh rate;
• matching a timing of a first light-emitting (EM) start vertical (ESTV) with a timing of a vertical back porch (VBP), and performing an EM scanning according to an EM frequency;
• wherein a position of the VBP is determined according to a position of the Vsync;
• and
• matching a timing of a first gate start vertical (GSTV) and the timing of the first ESTV, and performing a gate scanning according to the first refresh rate;
• in response to receiving second image data sent by the AP within a preset delay duration of a vertical front porch (VFP) corresponding to the first refresh rate, obtaining a time interval between a current moment and a falling edge of a n-th light-emitting (EM) start vertical (ESTV);
• wherein the n-th ESTV is a next ESTV of the current moment, wherein the n is an integer greater than zero;
• and
• adjusting the VFP according to the time interval, wherein a timing of a gate start vertical (GSTV) and a timing of an ESTV match after the VFP is adjusted.

A mobile terminal, comprising:

• an application processor (AP), an organic light-emitting diode (OLED) display screen, and a display driver integrated circuit (DDIC) chip;
• wherein the AP and the DDIC chip are connected to each other through a mobile industry processor interface (MIPI);
• wherein the DDIC chip is configured to perform a first method comprising:
• initializing display screen parameters according to a first refresh rate;
• in response to receiving first image data sent by the AP, performing an image scanning according to the first refresh rate, comprising:
• generating a vertical synchronous signal (Vsync) according to the VFP corresponding to the first refresh rate;
• matching a timing of a first light-emitting (EM) start vertical (ESTV) with a timing of a vertical back porch (VBP), and performing an EM scanning according to an EM frequency;
• wherein a position of the VBP is determined according to a position of the Vsync;
• and
• matching a timing of a first gate start vertical (GSTV) and the timing of the first ESTV, and performing a gate scanning according to the first refresh rate;
• in response to not receiving second image data sent by the AP within a preset delay duration of a vertical front porch (VFP) corresponding to the first refresh rate, adjusting the first refresh rate to a second refresh rate;
• wherein the second refresh rate is less than the first refresh rate;
• and
• adjusting the display screen parameters according to the second refresh rate;
• or
• the DDIC chip is configured to perform a second method comprising:
• initializing display screen parameters according to a first refresh rate;
• in response to receiving first image data sent by an application processor (AP), performing an image scanning according to the first refresh rate, comprising:
• generating a vertical synchronous signal (Vsync) according to the VFP corresponding to the first refresh rate;
• matching a timing of a first light-emitting (EM) start vertical (ESTV) with a timing of a vertical back porch (VBP), and performing an EM scanning according to an EM frequency;
• wherein a position of the VBP is determined according to a position of the Vsync;
• and
• matching a timing of a first gate start vertical (GSTV) and the timing of the first ESTV, and performing a gate scanning according to the first refresh rate;
• in response to receiving second image data sent by the AP within a preset delay duration of a vertical front porch (VFP) corresponding to the first refresh rate, obtaining a time interval between a current moment and a falling edge of a n-th light-emitting (EM) start vertical (ESTV);
• wherein the n-th ESTV is a next ESTV of the current moment, wherein the n is an integer greater than zero;
• and
• adjusting the VFP according to the time interval, wherein a timing of a gate start vertical (GSTV) and a timing of an ESTV match after the VFP is adjusted.