Display screen rate conversion method and terminal

1. 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 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.

2. The method according to claim 1 , wherein 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, the adjusting the first refresh rate to a second refresh rate comprises:

in response to not receiving the second image data within the VFP corresponding to the first refresh rate, automatically extending the VFP by an extended duration; and

in response to the extended duration reaching the preset delay duration and not receiving the second image data, adjusting the first refresh rate to the second refresh rate; wherein the preset delay duration is determined according to the VFP corresponding to the second refresh rate.

3. The method according to claim 1 , after the adjusting the first refresh rate to a second refresh rate, further comprising:

adjusting the VFP according to a position of a next ESTV, wherein a timing of a GSTV matches with a timing of the next ESTV after the VFP is adjusted.

4. The method according to claim 1 , further comprising:

after completing the image scanning, setting high a tearing effect (TE) signal and maintaining the TE signal at a high level; wherein the AP is configured to issue generated image data in response to the TE signal being at a high level.

5. The method according to claim 1 , after the initializing display screen parameters according to a first refresh rate, further comprising:

inverting a tearing effect (TE) signal according to the first refresh rate; wherein the AP is configured to determine whether generated image data exists in response to detecting a rising edge of the TE signal;

wherein after the performing an image scanning according to the first refresh rate, the method further comprises:

inverting the TE signal according to a preset inversion rate, wherein the preset inversion rate is greater than the first refresh rate.

6. The method according to claim 1 , further comprising:

receiving a (light-emitting) EM frequency conversion command issued by the AP; and

adjusting an EM frequency according to the EM frequency conversion command; wherein the adjusted EM frequency is an integer multiple of a current refresh rate.

7. The method according to claim 1 , after the adjusting the display screen parameters according to the second refresh rate, further comprising:

in response to receiving third image data sent by the AP within the VFP corresponding to the first refresh rate, adjusting the second refresh rate to the first refresh rate; and

adjusting the display screen parameters according to the first refresh rate.

8. The method according to claim 1 , wherein the first refresh rate is a maximum refresh rate of the OLED display screen.

9. The method according to claim 8 , wherein the adjusting the first refresh rate to a second refresh rate comprises:

adjusting the first refresh rate to the second refresh rate in a step-by-step manner; wherein the second refresh rate and the first refresh rate are adjacent refresh rates in terms of values.

10. The method according to claim 1 , applied to the DDIC chip of the OLED in a mobile terminal.

11. 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.

12. The method according to claim 11 , wherein the adjusting the VFP according to the time interval comprises:

obtaining a sum of durations of the VFP, the Vsync, and the VBP corresponding to the first refresh rate;

in response to the time interval being greater than the sum of the durations, performing a first method to adjust the VFP, wherein after the VFP is adjusted by the first method, the timing of the GSTV matches the timing of the n-th ESTV; and

in response to the time interval being less than the sum of the durations, performing a second method to adjust the VFP; wherein after the VFP is adjusted by the second method, the timing of the GSTV matches the timing of a n+1th ESTV.

13. 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.

14. The mobile terminal according to claim 13 , wherein 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, the adjusting the first refresh rate to a second refresh rate comprises:

in response to not receiving the second image data within the VFP corresponding to the first refresh rate, automatically extending the VFP by an extended duration; and

in response to the extended duration reaching the preset delay duration and not receiving the second image data, adjusting the first refresh rate to the second refresh rate; wherein the preset delay duration is determined according to the VFP corresponding to the second refresh rate.

15. The mobile terminal according to claim 13 , after the adjusting the first refresh rate to a second refresh rate, further comprising:

adjusting the VFP according to a position of a next ESTV, wherein a timing of a GSTV matches with a timing of the next ESTV after the VFP is adjusted.

16. The mobile terminal according to claim 13 , wherein in condition of the DDIC chip being configured to perform the first method, the first method further comprises:

after completing the image scanning, setting high a tearing effect (TE) signal and maintaining the TE signal at a high level; wherein the AP is configured to issue generated image data in response to the TE signal being at a high level.

17. The mobile terminal according to claim 13 , wherein in condition of the DDIC chip being configured to perform the first method, after the initializing display screen parameters according to a first refresh rate, the first method further comprises:

inverting a tearing effect (TE) signal according to the first refresh rate; wherein the AP is configured to determine whether generated image data exists in response to detecting a rising edge of the TE signal;

wherein after the performing an image scanning according to the first refresh rate, the method further comprises:

inverting the TE signal according to a preset inversion rate, wherein the preset inversion rate is greater than the first refresh rate.