Data Driver Energy Retrieval for Display Power Reduction
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Solution Overview
Problem
Current display systems, particularly those with high-definition resolutions, face significant power consumption challenges due to the large number of driver ICs required and the high capacitance of data lines, leading to inefficient energy usage and increased heat generation, which is exacerbated by the need for frequent charging and discharging of capacitors at high frequencies.
Innovation Solution
A data driver system that incorporates an energy retrieving unit capable of driving data lines with intermediate voltages, allowing for the retrieval of energy stored in the data lines by gradually increasing the voltage from a start voltage to an end voltage through multiple intermediate stages, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a display system uses multiple driver ICs to handle high-definition resolutions, then the number of channels is increased to support more pixels, but the power consumption increases due to frequent charging and discharging of capacitors at high frequencies
Solution Approach 1:
The patent recovers energy stored in the data line capacitance by reversing the voltage transition direction. When voltage needs to transition from high to low, the circuit first charges the capacitance to a higher voltage than the final target, then reverses the transition to retrieve the stored energy, converting it back to usable power rather than dissipating it as heat.
Solution Approach 2:
The patent changes the voltage transition parameters by introducing intermediate voltage levels and reversing transition directions. Instead of direct high-to-low or low-to-high transitions, the system uses multi-stage voltage changes with reversal points, optimizing the charging/discharging cycles to recover energy while maintaining the required display resolution performance.
2Speed
If the voltage transitions directly from start voltage to end voltage, then the driving speed is fast, but energy stored in the data line is wasted and power consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-charging the data line capacitance to a voltage higher than the final target voltage before initiating the reverse transition. This preliminary over-charging enables subsequent energy recovery during the voltage reversal phase, transforming what would be wasted energy into recoverable power while maintaining fast transition speeds.
Solution Approach 2:
The patent implements periodic action through oscillating voltage transitions that repeatedly charge and discharge the data line capacitance in a controlled manner. By periodically reversing the voltage transition direction, the system creates multiple opportunities to recover energy that would otherwise be lost during each voltage transition cycle.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively minimizes power consumption by retrieving and reusing energy stored in the data lines, reducing the overall energy required to drive the display and extending the usage time of portable devices while maintaining high picture quality.
Implementation Method 1
a data driver for driving a data line which is a capacitive load having one end electrically connected to a unit pixel
Data Source
AI summary
Disclosed are a data driver, a display, and a method of driving a display. The data driver for driving a data line which is a capacitive load having one end electrically connected to a unit pixel includes an energy retrieving unit configured to drive the data line by applying a voltage to the data line, and a data driving unit configured to finely tune a voltage and drive the data line with an end voltage. The energy retrieving unit retrieves energy charged up in the data line in stages by driving the data line with voltages from a start voltage to the end voltage through an intermediate voltage.