Display Device Scan Line Grouping for Low-Frequency Power Reduction
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Solution Overview
Problem
Display devices face challenges in reducing power consumption while maintaining display quality, particularly in driving pentile structure displays where efficient scan line management is crucial.
Innovation Solution
The implementation of an alternative scan driving (ASD) method in a display device that includes a driving controller capable of determining operation modes and adjusting scan line driving frequencies, swapping color signals during low-frequency frames to optimize power usage without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If scan lines are driven at high frequency to maintain display quality, then image quality is preserved, but power consumption increases
Solution Approach 1:
The display panel is divided into multiple scan line groups (first group, second group, third group) that are driven alternately in different frames. This segmentation allows the scan driving circuit to activate only a subset of scan lines in each frame, reducing the overall power consumption while maintaining complete image coverage across multiple frames
Solution Approach 2:
The patent implements periodic scanning where different scan line groups are activated in alternating frames (e.g., first group in frame 1, second group in frame 2, third group in frame 3). This periodic action distributes the scanning load over time, reducing instantaneous power consumption while ensuring all pixels receive their required data over the course of multiple frames
2Use of energy by moving object
If scan lines are driven at low frequency to reduce power consumption, then energy efficiency improves, but display quality may deteriorate
Solution Approach 1:
The driving controller pre-determines the operation mode (normal mode or low frequency mode) based on the image signal characteristics before initiating the scanning process. In low frequency mode, the controller prepares and buffers image data in advance, organizing it into multiple data sets corresponding to different scan line groups and frames, ensuring that data is ready for transmission when each scan line group is activated
Solution Approach 2:
The driving controller acts as an intermediary that manages the complex coordination between reduced scan frequency and maintained image quality. It performs mode determination, generates appropriate control signals for the scan driving circuit, and orchestrates the timing and sequence of data transmission to data lines, ensuring that even at low frequencies, each pixel receives the correct data at the correct time
3Use of energy by moving object
If alternative scan driving is implemented to reduce power consumption, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The driving controller is designed with multi-functionality to handle both normal mode and low frequency mode operations. It incorporates mode determination capability that can identify whether the current image signal requires low frequency driving, and automatically adjusts its control strategy accordingly. This universal design allows the same hardware controller to manage different scanning regimes without requiring separate dedicated circuits for each mode
Data Source
AI summary
A driving controller of a display device controls a scan driving circuit to sequentially drive a first group of scan lines among a plurality of scan lines to an active level during a first low-frequency frame when the operation mode is a low frequency mode and to sequentially drive a second group of scan lines among the plurality of scan lines to the active level during a second low-frequency frame, outputs an image data signal according to a first arrangement order of a plurality of color pixels in a first row during the first low-frequency frame, and outputs the image data signal according to a second arrangement order of the plurality of color pixels in a second row during the second low-frequency frame.