Scan Driver Segmentation for Power Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current scan drivers for organic light emitting display devices face challenges in reducing power consumption, particularly in managing scan signals for efficient image display across different frequency modes, which affects display quality and energy efficiency.
Innovation Solution
The proposed scan driver incorporates a driving circuit and masking circuit with control and output circuits that manage scan signals based on clock and carry signals, allowing for voltage level control and efficient operation across compensation and initialization scan lines, enabling reduced power consumption and improved image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional scan driver operates all scan lines at a single frequency, then the device complexity is low, but the power consumption cannot be optimized for different display regions
Solution Approach 1:
The scan driver is divided into multiple independent driving stages, each capable of operating at different frequencies. Each stage includes separate output circuits for compensation scan lines and initialization scan lines, allowing regional frequency differentiation to optimize power consumption in different display regions.
Solution Approach 2:
The scan driver implements dynamic frequency control where different driving stages can operate at different frequencies based on display requirements. The driver can switch between single-frequency and multi-frequency modes, and within multi-frequency mode, different regions can be dynamically adjusted to achieve optimal power efficiency.
2Use of energy by moving object
If multiple output circuits are used to drive different scan lines, then the power consumption can be optimized, but the device complexity increases
Solution Approach 1:
Each driving stage is designed with universal functionality to drive both compensation scan lines and initialization scan lines through separate output circuits. The control circuit can selectively activate different output circuits based on the required operation mode, making the circuit structure versatile while managing complexity through controlled activation.
Solution Approach 2:
Different output circuits within each driving stage are optimized for specific functions: one output circuit is dedicated to compensation scan lines while another is dedicated to initialization scan lines. This local optimization allows tailored driving waveforms for different scan line types, improving power efficiency without requiring complete circuit redesign.
3Manufacturing precision
If the scan driver supports multi-frequency modes for different display regions, then the image display quality improves, but the control complexity increases
Solution Approach 1:
The control circuit is designed to pre-configure driving stages for different frequency modes. Before switching to multi-frequency mode, the control circuit prepares the appropriate driving stages and configures their output circuits, ensuring smooth transitions and maintaining display quality without requiring complex real-time adjustments during operation.
4Reliability
If separate output circuits are used for compensation and initialization scan lines, then the scan signal management improves, but the power consumption increases
Solution Approach 1:
The separate output circuits for compensation and initialization scan lines are activated periodically based on display refresh requirements. The control circuit selectively enables these circuits only when their respective scan lines need to be driven, rather than maintaining continuous operation, thereby reducing overall power consumption while ensuring reliable scan signal management when needed.
Data Source
AI summary
Provided is a scan driver of a display device, and the scan driver includes a driving circuit and a masking circuit. The driving circuit includes a control circuit, a first output circuit, and a second output circuit. The control circuit outputs a first control signal and a second control signal. The first output circuit is connected to a first output terminal which outputs a first scan signal and a first voltage terminal and operates in response to a first control signal. The second output circuit is connected to a first output terminal and a second voltage terminal and operates in response to a second control signal. The masking circuit outputs a second scan signal to a second output terminal in response to the first control signal and the second control signal and is connected to an input terminal to which a masking signal is supplied.