AMOLED Driving Method Optimizing Sub-Frame Sequences
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Solution Overview
Problem
AMOLED panels experience pseudo contour display defects due to sub-frame sequence changes, which are typically addressed by increasing the refresh rate, leading to increased power consumption.
Innovation Solution
A method of driving AMOLED panels by dividing frames into sub-frames with geometric progression time periods and determining the sub-frame sequence based on pixel characteristics and grayscale values, allowing the sequence to be the same or opposite to the previous frame, without altering power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the refresh rate is increased to cure pseudo contour issues, then display quality is improved, but power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the sub-frame sequence adaptive rather than fixed. The sequence is dynamically adjusted based on the relationship between current and previous frames (same sequence, opposite sequence, or reversed sequence), allowing the system to optimize display quality without uniformly increasing refresh rate, thus managing power consumption effectively
Solution Approach 2:
The patent changes the parameter of sub-frame sequence arrangement based on frame characteristics. By determining whether to use same sequence, opposite sequence, or reversed sequence depending on the relationship between current and previous frames, the system optimizes display quality while controlling power consumption without requiring higher refresh rates
2Adaptability or versatility
If the light emitting period is extended to show different grayscales, then grayscale control is improved, but display defects such as pseudo contour occur
Solution Approach 1:
The patent segments the frame into multiple sub-frames with different time periods, allowing different grayscales to be displayed by combining these sub-frames. The segmentation enables grayscale control while the specific arrangement of sub-frames prevents pseudo contour defects
Solution Approach 2:
The patent applies inversion by using reversed sequence in certain cases. When the relationship between current and previous frames requires it, the sub-frames are arranged in reverse order, which effectively eliminates pseudo contour defects while maintaining grayscale control capability
Data Source
AI summary
A method of driving active-matrix organic light-emitting diode (AMOLED) panels includes: (A) dividing a current frame of a current image corresponding to an i-th color component into a plurality of sub-frames, wherein iε[1,N], and N is a total number of the color component; (B) obtaining a sequence of the sub-frames of a previous frame of a previous image corresponding to the i-th color component, wherein the previous frame has been divided into a plurality of sub-frames by the same way with the current frame; (C) determining the sequence of the sub-frames of the current frame in accordance with the sequence of the sub-frames of the previous frame, wherein the sequence of the sub-frames (SF) of the current image is same with or is different from that of the previous frame; and (D) controlling the panel to display in accordance with the sequence of the sub-frames of the current frame determined by corresponding color components.