Dual Emission Driver Display Control for Low-Power Variable Refresh
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Solution Overview
Problem
Existing display devices face challenges in minimizing power consumption when driven at high and low frame frequencies, as current methods do not effectively manage power usage in high-speed and low-speed driving modes.
Innovation Solution
The display device incorporates a scan driver and emission drivers configured to operate in different modes, with a timing controller controlling the drivers to supply scan and emission control signals, and includes capacitors and transistors to optimize power usage based on driving frequency, using high-level and low-level control signals to manage power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single emission driver is used for both high-speed and low-speed driving modes, then device complexity is reduced, but power consumption cannot be effectively minimized in both modes
Solution Approach 1:
The emission driver is divided into two separate drivers: a first emission driver for high-speed driving mode and a second emission driver for low-speed driving mode. This segmentation allows each driver to be optimized for its specific operating mode, enabling effective power consumption minimization in both modes while maintaining manageable device complexity through specialized function division.
2Use of energy by moving object
If the first emission driver operates at low frequency, then power consumption is reduced, but the display refresh rate cannot be maintained
Solution Approach 1:
The system dynamically switches between the first emission driver (optimized for high-speed mode) and the second emission driver (optimized for low-speed mode) based on the required display refresh rate. This dynamic selection allows the display system to maintain the appropriate refresh rate for different operating conditions while minimizing power consumption by using the driver best suited for each mode.
3Use of energy by moving object
If the second emission driver uses scan signals instead of emission clock signals, then power consumption is minimized, but control precision is reduced
Solution Approach 1:
Different signal types are used for different drivers based on their specific requirements: the first emission driver receives precise emission clock signals for high-speed mode where timing precision is critical, while the second emission driver uses scan signals for low-speed mode where power consumption is the primary concern and timing precision requirements are relaxed. This local optimization resolves the contradiction between power consumption and control precision.
Data Source
AI summary
A display device includes: pixels connected to scan lines and emission control lines; a scan driver to supply a scan signal to the scan lines according to scan clock signals; a first emission driver to supply a first emission control signal to the emission control lines according to emission clock signals, when the display device is driven in a first mode; a second emission driver to supply a second emission control signal to the emission control lines according to the scan signal, when the display device is driven in a second mode; and a timing controller to control the scan driver, the first emission driver, and the second emission driver.