Source Driver Power Down Mode for Current Reduction
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Solution Overview
Problem
Display devices, particularly source drivers, consume excessive current due to fixed power settings, leading to unnecessary power consumption regardless of changes in load state or resolution, especially during periods like vertical or horizontal blank periods.
Innovation Solution
A source driver with a power down mode that reduces current consumption by controlling output buffers and multiplexers, enabling power-saving operations during low-load states, such as vertical or horizontal blank periods, and maintaining previous data states to minimize refresh operation current usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed power options are applied to the source driver, then the source driver can maintain stable operation, but the source driver consumes excessive current during low-load states such as vertical or horizontal blank periods
Solution Approach 1:
The source driver transitions from fixed power options to dynamic power adjustment by implementing multiple power modes (normal mode and power down mode) that can be switched based on operational state. The control unit monitors the operational state and automatically selects the appropriate power mode, allowing the driver to adapt its power consumption to match the actual load requirements during different periods such as active display vs. blank periods.
Solution Approach 2:
The patent changes the power supply parameter from a fixed value to variable values by implementing different voltage levels or current levels corresponding to different operational modes. The control unit adjusts the power supply parameter based on the detected operational state, enabling the source driver to consume appropriate current levels for each operational condition.
2Reliability
If the refresh cycle is shortened to compensate for cell current leakage, then the display panel maintains cell voltage, but unnecessary current consumption occurs
Solution Approach 1:
The source driver dynamically adjusts its operation based on the display panel's operational state. During blank periods when the display panel is not actively showing images, the source driver enters power down mode to minimize current consumption. The control unit monitors operational state and automatically transitions between power modes, allowing the system to maintain cell voltage during active periods while reducing current consumption during blank periods.
Solution Approach 2:
The source driver implements periodic power mode transitions based on the display refresh cycle. During active display periods, the source driver operates in normal mode to provide full refresh. During blank periods, it transitions to power down mode. This periodic switching between operational states allows the system to maintain image quality during active periods while reducing overall current consumption during non-active periods.
Data Source
AI summary
Provided are a display device and a source driver. The source driver may perform a power down mode in response to any one of a vertical blank period, a horizontal blank period, a state in which the load of a panel is maintained at a preset value or less, a state in which a current supplied to the panel is maintained at a preset value or less, or a state in which resolution is maintained at a preset value or less. The source driver can realize the power down mode using various power options, thereby reducing power consumption.