Data Driver Power Management for Display Devices
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Solution Overview
Problem
Display devices, particularly organic light emitting displays, face challenges in reducing power consumption while maintaining an enhanced slew rate to prevent impairment of circuit elements.
Innovation Solution
A data driver with a multiplexer and power management circuit that adjusts power consumption based on the overlap of mux control signals, using a calculator to generate logic signals for varying power modes, and an output buffer to amplify data voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power consumption of the display device is reduced, then energy efficiency is improved, but the slew rate of circuit elements becomes impaired
Solution Approach 1:
The patent applies dynamics by making the power consumption level adjustable based on operational conditions. The data driver dynamically switches between first and second power consumption levels depending on whether multiple switching elements are turned on simultaneously, allowing the system to optimize between power saving and performance requirements in real-time
Solution Approach 2:
The patent changes the power consumption parameter adaptively. By detecting the turn-on state of multiple switching elements in the multiplexer, the system modifies the power consumption level parameter - using lower power when fewer elements are active and higher power when multiple elements are turned on simultaneously to maintain slew rate performance
2Productivity
If multiple switching elements are turned on simultaneously, then data driving capability is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts power consumption based on the operational state. When multiple switching elements are turned on simultaneously (indicating high data driving demand), the power consumption level is increased to maintain performance. When fewer elements are active, power consumption is reduced, creating a dynamic balance between productivity and energy usage
Data Source
AI summary
A display device can include a display panel including a plurality of subpixels, a data driver configured to supply a data voltage to the plurality of subpixels through a plurality of data lines, and a multiplexer connected between the data driver and the plurality of data lines, the multiplexer including a plurality of switching elements controlled by a plurality of mux control signals. Also, a power consumption mode of the data driver is configured to change based on whether turn-on periods of the plurality of mux control signals overlap with each other.