Display Driving Circuit Power Gating With Self-Scan Data Retention
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Solution Overview
Problem
Display devices face challenges in minimizing power consumption during low-speed driving while maintaining high-speed driving functionality and efficient image switching.
Innovation Solution
A driving circuit unit with a first driver for active periods and a second driver for blank periods, along with storage units and switches, is used to manage power supply and data storage, allowing for power cutoff during inactive periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device is driven at low-speed driving, then power consumption is reduced, but the driving frequency is limited
Solution Approach 1:
The driving circuit is segmented into a first driver for active periods and a second driver for blank periods, allowing independent control of each driver's power supply. This segmentation enables the first driver to be powered down during blank periods while the second driver maintains operation, reducing overall power consumption without completely stopping the display refresh function.
Solution Approach 2:
The power supply to the first driver is dynamically controlled through a first switch that responds to control signals, transitioning between on and off states based on whether the device is in active or blank period. This dynamic power management allows the system to adapt power consumption to the actual operational needs of each driver at different times.
2Use of energy by moving object
If the first driver is powered off during blank period, then power consumption is minimized, but driving data must be preserved
Solution Approach 1:
Before the first switch turns off the first driver during the blank period, the first storage unit receives and stores the driving data from the first driver in advance. This preliminary data preservation ensures that when the first driver is powered down, its driving data is already saved and will not be lost, enabling seamless resumption of operation in the next active period.
Solution Approach 2:
The first storage unit acts as an intermediary between the first driver and the data output, temporarily holding the driving data when the first driver is powered off. This intermediary storage mechanism decouples the data preservation function from the active driver operation, allowing the driver to be powered down while maintaining data integrity.
3Use of energy by moving object
If switches are used to control power supply, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The first switch serves multiple functions: it controls the power supply to the first driver, responds to control signals from the second driver, and coordinates with the first storage unit for data preservation. By making the switch multi-functional, the patent reduces the need for separate dedicated components for each function, thereby limiting the increase in overall device complexity while achieving power management goals.
Data Source
AI summary
A driving circuit unit includes: a first driver configured to be driven during a display scan period included in an active period of one frame; a second driver configured to be driven during at least one self-scan period included in a blank period of the one frame; a first switch connected between a driving power line to which driving power is supplied and the first driver, configured to be turned on in the active period, and configured to be turned off in the blank period; and a first storage unit configured to receive and store driving data from the first driver before the first switch is turned off.