Source Driving Apparatus Power Saving Mechanism for Flat Panel Displays
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Solution Overview
Problem
Source driving apparatuses for liquid crystal displays without power saving mechanisms consume significant power due to the need for frequent polarity inversion, leading to high energy consumption.
Innovation Solution
A source driving apparatus with a power-saving mechanism that includes an output buffer stage and a power-saving circuit, utilizing a flying capacitor and switches to collect and release charges from data lines, allowing the power-saving circuit to overcharge either the positive or negative supply, thereby reducing power consumption during polarity inversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity inversion is performed frequently to prevent liquid crystal molecule deterioration, then display quality and reliability are improved, but power consumption increases
Solution Approach 1:
The patent converts the harmful effect of charge accumulation on data lines into a beneficial resource by collecting these charges through the power-saving circuit and reusing them to supply power during polarity inversion operations, thereby reducing overall power consumption while maintaining necessary polarity inversion for liquid crystal protection
Solution Approach 2:
Instead of dissipating the charges accumulated on data lines during polarity inversion as waste energy, the patent recovers these charges through the power-saving circuit's flying capacitor and switch network, storing them for later reuse to supply power during subsequent polarity inversion cycles
2Use of energy by moving object
If a power-saving circuit is added to reduce power consumption, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The power-saving circuit is designed to perform multiple functions: collecting charges from data lines, storing them in the flying capacitor, and supplying power during polarity inversion. This multi-functionality reduces the need for separate circuits for each function, thereby limiting the increase in overall device complexity
Solution Approach 2:
The flying capacitor serves as an intermediary energy storage element between the data lines and the power supply system. It mediates the transfer and storage of charges, enabling the power-saving function without requiring complex direct coupling between all circuit components
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
The power-saving mechanism effectively reduces energy consumption by utilizing stored charges to overcharge the supply during data line driving, maintaining display quality while minimizing power usage.
Implementation Method 1
The power-saving circuit collects charges from an equivalent load capacitors of each of the data lines
Implementation Method 2
The power-saving circuit charges one of the positive supply and the negative supply in response to the collected charges
Data Source
AI summary
A source driving apparatus with power saving mechanism and a flat panel display using the same are provided. The source driving apparatus includes an output buffer stage and a power-saving circuit. The output buffer stage operates under a dual power, and has a positive and negative output channels respectively coupled to two adjacent data lines in a display panel. Moreover, the power-saving circuit is coupled between the output buffer stage and the display panel. The power-saving circuit collects charges from an equivalent load capacitor of each data line, before the output buffer stage drives the two adjacent data lines through the positive and negative output channels. The power-saving circuit charges one of a positive supply and a negative supply of the dual power in response to the collected charges, during the output buffer stage drives the two adjacent data lines through the positive and negative output channels.