Compressed Frame Scanning for PMOLED Displays
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Solution Overview
Problem
Conventional PMOLED display driving methods struggle to maintain a high refresh rate when the number of rows exceeds a certain limit, leading to reduced brightness and visual flickering due to increased aggregate scan time.
Innovation Solution
A system and method for compressed frame scanning, which identifies pixels with maximum brightness data in each row, computes scan times based on brightness indices, and determines aggregate scan times to enable efficient scanning of frames, potentially dividing frames into sub-frames for further compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of rows is extended to increase display resolution, then the display can show more pixels, but the aggregate scan time increases beyond the refresh rate period causing reduced brightness and flickering
Solution Approach 1:
The patent divides the frame into multiple sub-frames, where each sub-frame contains a subset of rows to be scanned. This segmentation allows the scanning task to be distributed across multiple smaller units, enabling the display to maintain high refresh rates even with an increased total number of rows by scanning sub-frames in sequence within the same time period.
2Device complexity
If conventional scanning method is used with fixed scan time per row, then the scanning process is simple, but the refresh rate decreases when number of rows increases
Solution Approach 1:
The patent implements dynamic scan time adjustment where the scan time allocated to each row is not fixed but varies based on the brightness index of pixels in that row. Rows with higher brightness indices are scanned for longer durations to maintain perceived brightness, while rows with lower brightness indices receive shorter scan times. This dynamic allocation allows the system to maintain high refresh rates with more rows by optimizing the time distribution rather than using uniform fixed timing.
3Device complexity
If all source drivers drive the display panel concurrently with one common electrode switch selected at a time, then the driving method is simple, but the scan time per frame increases when number of rows exceeds 100
Solution Approach 1:
The patent segments the frame into multiple sub-frames, where each sub-frame contains a subset of rows to be scanned. This segmentation allows the scanning task to be distributed across multiple smaller units, enabling the display to maintain high refresh rates even with an increased total number of rows by scanning sub-frames in sequence within the same time period.
Solution Approach 2:
The patent changes the scanning parameter from a fixed uniform scan time across all rows to a variable scan time based on brightness index. By adjusting the scan time parameter dynamically according to the content requirements of each row, the system optimizes the total frame scan time to fit within the refresh rate constraints even when the number of rows is increased.
Data Source
AI summary
A system enabling compressed frame scanning for a display and a method thereof are described herein. A pixel having a maximum pixel data in a row of the plurality of rows corresponding to a frame is identified. The maximum pixel data identified in the row is assigned as a pixel data for the row. A scan time for the row is computed based upon the pixel data of the row and a scanning time associated with a unit of the brightness index. An aggregate scan time for the frame is determined based upon the scan time computed for each of the plurality of rows corresponding to the frame. Finally, the frame is scanned based upon the aggregate scan time determined for the frame thereby enabling compressed scanning of the frame. The method is further implemented for randomly assigned rows of the frame to two or more sub-frames of the frame.