Source Driver Power Down Mode for Display Devices
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Solution Overview
Problem
Display devices, such as LCDs and OLEDs, require low power consumption for their driving devices due to their reduced size and weight, but existing technologies have not effectively addressed the need for minimizing power consumption in source drivers.
Innovation Solution
A source driver is designed with a gamma voltage generation unit, digital analog converter, output buffer, and selection unit that selectively provide and buffer gamma voltages, allowing for power down modes to reduce current consumption during non-display periods, thereby minimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the source driver operates continuously to maintain display functionality, then the display can respond immediately to input signals, but power consumption increases during non-display periods
Solution Approach 1:
The source driver alternates between active operation during display periods and power down mode during blank periods. The control unit switches the output buffer between these two states based on timing signals, enabling the driver to be active only when needed for displaying images and to enter power saving mode during intervals between frames or fields, thus reducing overall power consumption while maintaining display functionality.
2Use of energy by moving object
If the output buffer enters power down mode to reduce current consumption, then power consumption decreases, but the ability to quickly resume normal operation may be affected
Solution Approach 1:
The control unit is configured to control the output buffer to enter the power down mode in advance during blank periods when no display operation is needed. By anticipating the transition to idle state and preparing the buffer accordingly, the system can smoothly switch between active and power saving modes without disrupting display reliability or causing delays when resuming operation.
Data Source
AI summary
Provided are a source driver and a display device. The source driver may include: a gamma voltage generation unit configured to select and provide one or more of the gamma voltages in response to a first power down signal; an output buffer unit configured to provide a data voltage to a output terminal in response to a second power down signal; and a selection unit configured to provide the gamma voltage to the output terminal.