Decay factor accumulation method and decay factor accumulation module using the same

Patent metadata

Field	Value
Publication number	US-10943531-B1
Application number	US-202016891081-A
Country	US
Kind code	B1
Filing date	Jun 3, 2020
Priority date	Jun 3, 2020
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

The present invention provides a decay factor accumulation method for an organic light-emitting diode (OLED) display panel with a variable refresh rate (VRR). The decay factor accumulation method includes detecting an operating frame rate of an input image; generating a decay factor compensation coefficient according to the operating frame rate and a measurement frame rate; and generating a plurality of accumulated decay factors of the input image according to a decay factor lookup table corresponding to the measurement frame rate and the decay factor compensation coefficient.

First claim

What is claimed is:

1. A decay factor accumulation method, for an organic light-emitting diode (OLED) display panel with a variable refresh rate (VRR), comprising:
detecting an operating frame rate of an input image;
generating a decay factor compensation coefficient according to the operating frame rate and a measurement frame rate; and
generating a plurality of accumulated decay factors of the input image according to a decay factor lookup table corresponding to the measurement frame rate and the decay factor compensation coefficient.

2. The decay factor accumulation method of claim 1 , wherein the step of generating the plurality of accumulated decay factors of the input image according to the decay factor lookup table corresponding to the measurement frame rate and the decay factor compensation coefficient comprises:
looking up a plurality of decay factors of the input image from the decay factor lookup table; and
multiplying the plurality of decay factors with the decay factor compensation coefficient, to generate the plurality of accumulated decay factors.

3. The decay factor accumulation method of claim 1 , wherein the step of generating the decay factor compensation coefficient according to the operating frame rate and the measurement frame rate comprises:
generating the decay factor compensation coefficient according to a linear or non-linear relation or magnification between the operating frame rate and the measurement frame rate.

4. The decay factor accumulation method of claim 1 , wherein the step of generating the decay factor compensation coefficient according to the operating frame rate and the measurement frame rate comprises:
generating the decay factor compensation coefficient according to a decay factor compensation lookup table corresponding to the operating frame rate and the measurement frame rate.

5. The decay factor accumulation method of claim 1 , wherein the step of detecting the operating frame rate of the input image comprises:
detecting an oscillating number of an oscillator during the input image is displayed; and
calculating the operating frame rate according to the oscillating number and an oscillating frequency of the oscillator.

6. The decay factor accumulation method of claim 1 , wherein the OLED display panel compensates a subsequent image with the plurality of accumulated decay factors.

7. A decay factor accumulation module, for an organic light-emitting diode (OLED) display panel with a variable refresh rate (VRR), comprising:
a detecting circuit, for detecting an operating frame rate of an input image;
a decay factor compensation circuit, for generating a decay factor compensation coefficient according to the operating frame rate and a measurement frame rate; and
a decay factor accumulation circuit, for generating a plurality of accumulated decay factors of the input image according to a decay factor lookup table corresponding to the measurement frame rate and the decay factor compensation coefficient.

8. The decay factor accumulation module of claim 7 , wherein the decay factor accumulation circuit comprises:
a memory, for looking up a plurality of decay factors of the input image from the decay factor lookup table; and
a multiplier, for multiplying the plurality of decay factors with the decay factor compensation coefficient, to generate the plurality of accumulated decay factors.

9. The decay factor accumulation module of claim 7 , wherein the decay factor compensation circuit generates the decay factor compensation coefficient according to a linear or non-linear relation or magnification between the operating frame rate and the measurement frame rate.

10. The decay factor accumulation module of claim 7 , wherein the decay factor compensation circuit generates the decay factor compensation coefficient according to a decay factor compensation lookup table corresponding to the operating frame rate and the measurement frame rate.

11. The decay factor accumulation module of claim 7 , wherein the detecting circuit detects an oscillating number of an oscillator during the input image is displayed, and calculates the operating frame rate according to the oscillating number and an oscillating frequency of the oscillator.

12. The decay factor accumulation module of claim 7 , wherein the OLED display panel compensates a subsequent image with the plurality of accumulated decay factors.

Assignees

• Novatek Microelectronics Corp

Inventors

• Chen Li-Chieh
• Liao Yen-Tao

Classifications

• G09G2340/0435

  Change or adaptation of the frame rate of the video stream · CPC title

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G5/10

  Intensity circuits · CPC title

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title