Multilevel Voltage Driving Device Using Discrete Components
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Solution Overview
Problem
Conventional multilevel voltage driving devices for liquid crystal displays are costly due to the use of integrated operational amplifiers, leading to high costs and potential flickering issues caused by parasitic capacitors during pixel charging and discharging.
Innovation Solution
A multilevel voltage driving device comprising a level converter and a switch selector, utilizing discrete components to generate high and intermediate voltage levels, reducing costs and power consumption by alternately selecting these levels based on control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an integrated operational amplifier is used to generate multilevel voltage, then the driving function is achieved, but the cost and power consumption increase
Solution Approach 1:
The patent divides the voltage generation function into multiple independent voltage generation circuits, each responsible for generating a specific voltage level. This segmentation replaces the need for a single complex integrated operational amplifier with multiple simpler, discrete voltage generation circuits, reducing cost while maintaining the multilevel voltage driving function.
Solution Approach 2:
The patent introduces a voltage selection circuit as an intermediary component that selects between multiple generated voltage levels based on control signals. This intermediary mechanism enables the system to achieve multilevel voltage output through discrete components rather than requiring a single integrated operational amplifier, thereby reducing cost and power consumption.
2Reliability
If an integrated operational amplifier is used to generate multilevel voltage, then the driving function is achieved, but the power consumption increases
Solution Approach 1:
The patent segments the voltage generation into multiple independent circuits, each consuming power only when actively generating its specific voltage level. This segmentation reduces overall power consumption compared to a single integrated operational amplifier that must continuously operate to provide all voltage levels.
Solution Approach 2:
The voltage selection circuit acts as an intermediary that efficiently routes power to only the necessary voltage generation circuit at any given time, based on control signals. This intermediary mechanism minimizes power waste by ensuring that only the required voltage levels are generated and maintained.
3Device complexity
If a single voltage level is used for pixel charging, then the circuit is simple, but flickering occurs due to parasitic capacitors
Solution Approach 1:
The patent segments the voltage output into multiple discrete levels through independent voltage generation circuits. By providing multiple voltage levels (e.g., high level, intermediate level, low level), the system can transition through intermediate states during pixel charging, thereby reducing the impact of parasitic capacitor discharge and eliminating flickering while maintaining relatively simple circuit architecture.
Solution Approach 2:
The patent changes the voltage parameter from a single level to multiple levels. By introducing intermediate voltage levels between the high and low states, the system reduces the voltage jump magnitude during transitions, which minimizes the effect of parasitic capacitors and eliminates flickering without significantly increasing circuit complexity.
Data Source
AI summary
Provided is a multilevel voltage driving device and system. The multilevel voltage driving device comprises a level converter, which is provided with an AC signal input terminal for inputting an AC signal, a high level output terminal for outputting a high level, and an intermediate level output terminal for outputting an intermediate level; and a switch selector, which is connected with the high level output terminal and the intermediate level output terminal, and which is provided with a control signal input terminal, for inputting a control signal to alternately select the high level and intermediate level, and an output terminal for outputting the selected level.