Block-Wise PMIC Architecture for Display Panel Power Reduction
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Solution Overview
Problem
The size of the power management integrated circuit (PMIC) in display devices increases due to the need to output various power voltages, which is not efficiently addressed in prior art.
Innovation Solution
The PMIC is implemented as a single integrated circuit that includes power voltage circuits and multiplexers, packaged together, to output power voltages to divided blocks of the display panel, with a driving controller controlling the PMIC based on input image data, and further incorporating shift registers and pulse counters to generate selection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the power management integrated circuit outputs various power voltages to reduce power consumption, then power consumption is reduced, but the size of the power management integrated circuit increases
Solution Approach 1:
The display panel is divided into multiple blocks, and the power management integrated circuit is configured to output different power voltages to different blocks based on their maximum grayscale values. This segmentation allows the PMIC to reduce power consumption by applying appropriate power levels only where needed, rather than uniformly across the entire display panel.
Solution Approach 2:
The power management integrated circuit is designed to perform multiple functions: it determines maximum grayscale values for different blocks, generates corresponding power voltages, and outputs these voltages to respective blocks. This multi-functionality enables the PMIC to achieve power reduction while maintaining the capability to drive the entire display panel with varying power requirements.
2Use of energy by moving object
If the power management integrated circuit outputs various power voltages to different blocks, then power consumption is reduced, but the complexity of the power management integrated circuit increases
Solution Approach 1:
The power management integrated circuit applies different power voltages to different blocks of the display panel based on their specific requirements determined by maximum grayscale values. This local quality approach allows the PMIC to optimize power consumption for each block individually while maintaining a unified control architecture, thereby managing complexity effectively.
Solution Approach 2:
The power management integrated circuit determines the maximum grayscale values for different blocks in advance and pre-configures the appropriate power voltages before outputting them to the respective blocks. This preliminary action simplifies the control logic by eliminating the need for real-time voltage adjustment during operation.
Data Source
AI summary
A display device includes a display panel including pixels, and configured into blocks, a data driver configured to provide a data voltage to the display panel, a power management integrated circuit including power voltage circuits implemented as one integrated circuit, packaged together, and configured to output power voltages respectively to the blocks of the display panel, and a driving controller configured to control the data driver and the power management integrated circuit based on input image data.