OLED Interlaced Scanning Sub-Frame Division for Flicker Reduction
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Solution Overview
Problem
OLED display devices experience false contours and flickers when displaying moving images due to the out-of-sequence emission times of neighboring grayscales, particularly at high speeds.
Innovation Solution
A method of driving OLED display devices in an interlaced scanning mode, where a single frame is divided into odd-numbered and even-numbered fields, each divided into multiple sub-frame groups, with some sub-frames corresponding to bits of driving data being further divided into portions and disposed in different groups to synchronize emission times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a time-division method is used to display multiple grayscales by dividing a single frame into sub-frames, then the grayscale display capability is improved, but false contours and flickers occur when displaying moving images at high speeds
Solution Approach 1:
The patent divides a single frame into multiple sub-frames, each corresponding to different grayscale levels. Each sub-frame is further divided into multiple portions that are displayed at different time intervals. This segmentation allows precise control of grayscale emission times while preventing false contours and flickers by ensuring that portions corresponding to the same grayscale level are emitted in sequence
Solution Approach 2:
The patent dynamically adjusts the emission timing of different sub-frame portions based on the grayscale level. By controlling the emission time of each portion according to its grayscale value and arranging them in sequential order, the system adapts the display timing to prevent visual artifacts while maintaining accurate grayscale representation
2Productivity
If sequential images are displayed at high speed using conventional time-division method, then the frame rate is improved, but emission times of neighboring grayscales become out of sequence causing false contours and flickers
Solution Approach 1:
The patent preliminarily organizes sub-frames into multiple groups before display, with each group containing portions arranged in sequential grayscale order. This preliminary arrangement ensures that when images are displayed at high frame rates, the emission times of neighboring grayscales remain in correct sequence, preventing false contours and flickers while maintaining high productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures accurate emission times of neighboring grayscales, significantly reducing the occurrence of false contours and flickers when displaying sequential images, such as moving images, at high speeds.
Implementation Method 1
electrons and holes are injected into an organic thin layer through a cathode and an anode and recombine in the organic thin layer to generate excitons, thereby emitting light of a certain wavelength
Data Source
AI summary
A method of driving an organic light emitting diode (OLED) display device that displays grayscales in a time-division manner and can prevent the occurrence of false contours and flickers at an interface between neighboring grayscales when displaying sequential images, such as moving images, at a high speed. The method is an interlaced scanning method in which a single frame is divided into an odd-numbered field and an even-numbered field that are sequentially driven, and includes dividing each of the odd-numbered field and the even-numbered field into x sub-frame groups; dividing each of a plurality of sub-frames corresponding to bits of driving data into y divided sub-frame portions; and disposing the y divided sub-frame portions in different ones of the x sub-frame groups.