Alternating Scan Line Driving for AMOLED Power Reduction
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Solution Overview
Problem
Existing display driving methods face challenges in reducing power consumption, particularly in AMOLED screens with high contrast and flexible displays, due to high current consumption and ghost phenomena at low frame rates, especially in always-on-display environments and during fast image changes.
Innovation Solution
The method involves alternating the activation of scan lines corresponding to odd-numbered and even-numbered rows, allowing for separate voltage application to red and blue sub-pixels, minimizing voltage swing and reducing power consumption, while improving frame rate by applying operations to both sets of scan lines within one or two frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If scan lines are sequentially activated in traditional order, then all pixels can be driven, but voltage swing increases and power consumption rises
Solution Approach 1:
The patent divides scan lines into two groups: odd-numbered scan lines and even-numbered scan lines. By segmenting the scanning process into separate passes for each group, the invention reduces voltage swing on source lines and lowers power consumption while maintaining frame rate performance
Solution Approach 2:
The patent implements periodic scanning by alternately activating odd scan lines in one frame and even scan lines in the next frame. This periodic action pattern allows for reduced voltage swing and lower power consumption compared to traditional sequential scanning
2Speed
If 60 Hz frame rate is used, then power consumption is lower, but ghost phenomenon occurs during fast image changes
Solution Approach 1:
By segmenting scan lines into odd and even groups that can be scanned independently, the patent enables higher frame rates (90-120 Hz) without proportionally increasing power consumption, thus reducing ghost phenomenon while maintaining energy efficiency
3Ease of manufacture
If voltage is alternately applied to source lines for red and blue sub-pixels, then pixel display is achieved, but current consumption increases
Solution Approach 1:
The patent segments the scanning process by group (odd/even scan lines) rather than by color sub-pixel, allowing for more efficient voltage management and reduced current consumption while still achieving proper pixel display
Solution Approach 2:
By implementing periodic scanning of odd and even scan line groups, the patent reduces the frequency of voltage transitions on source lines, thereby lowering current consumption while maintaining display quality
Data Source
AI summary
Disclosed is a method for driving a display, comprising the steps of: turning on one scan line from among a plurality of scan lines so as to drive a pixel connected to the scan line through a plurality of source lines; and turning off the scan line, and then turning on a scan line spaced apart from the scan line with at least one column there between, so as to drive a pixel connected to the scan line through a plurality of source lines.