OLED Scan Driver Power Reduction via Periodic Frame Scanning
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Solution Overview
Problem
Existing organic light emitting displays face high power consumption in standby mode, which reduces battery life, as both data and scan drivers continue to operate without power reduction.
Innovation Solution
Implementing a method where the scan driver is only driven during specific frames when scan signals are transmitted, and using a demultiplexer to distribute data signals across multiple frames, allowing for reduced power consumption by stopping scan signal transmission in standby mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the scan driver and data driver are continuously operated in standby mode, then the image display function is maintained, but power consumption increases and battery life decreases
Solution Approach 1:
The patent implements periodic scanning where scan signals are transmitted only in specific frames (e.g., every other frame) rather than continuously. The controller alternates between frames with scan signals and frames without scan signals, allowing the scan driver to remain in a low-power state during inactive frames while maintaining image display functionality through previously stored data signals.
2Use of energy by moving object
If the scan driver is stopped in standby mode, then power consumption is reduced, but image display continuity may be affected
Solution Approach 1:
The patent applies preliminary action by transmitting data signals to the pixel unit before the scan driver is stopped. The pixel unit stores these data signals in advance, so when the scan driver is inactive, the stored data signals are sufficient to maintain the image display without interruption, ensuring reliability while enabling power savings.
3Illumination intensity
If scan signals are transmitted in every frame, then image quality is maintained, but power consumption increases
Solution Approach 1:
The patent implements partial action by transmitting scan signals only in certain frames rather than every frame. This partial scanning approach maintains acceptable image quality for standby mode operations while significantly reducing the frequency of scan driver activation and associated power consumption.
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 significantly reduces power consumption during standby mode, extending battery life by limiting scan driver operation and maintaining image display through stored data signals across frames.
Implementation Method 1
an organic light emitting display displays an image using organic light emitting diodes (OLED) that generate light by re-combination of electrons and holes generated to correspond to the flow of current
Data Source
AI summary
An organic light emitting display capable of reducing power consumption in a standby mode to increase the use time of a battery and a method of driving the same. The organic light emitting display includes a pixel unit for displaying an image by utilizing a plurality of frames and in accordance with data signals and scan signals; a data driver for outputting the data signals; a scan driver for outputting the scan signals; and a controller for controlling the data driver and the scan driver so that, in at least one frame of the plurality of frames, the scan signals are not transmitted to the pixel unit.