Common Potential Generation Circuit Using Charge Recovery Feedback
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Solution Overview
Problem
Conventional common potential generation circuits in liquid crystal display devices face high power consumption, especially during the display of mixed pixel colors, and often require complex circuit configurations to achieve low power consumption.
Innovation Solution
A potential generation circuit utilizing a differential amplifier with negative feedback and a charge recovery capacitor, along with an anti-parallel diode, to reduce power consumption by optimizing the common potential generation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional common potential generation circuits are used, then the circuit can maintain the common potential, but the power consumption is high especially during mixed pixel color display
Solution Approach 1:
The patent implements a charge recovery circuit that captures and stores charge from the common potential generation circuit during operation. The recovery capacitor accumulates charge that would otherwise be dissipated, and this stored charge is then used to supplement the common potential generation, thereby reducing the continuous current requirement and lowering overall power consumption while maintaining stable common potential
Solution Approach 2:
The patent employs a feedback mechanism where the output of the common potential generation circuit is monitored and fed back to control the charge recovery operation. This feedback ensures that the common potential is maintained at the correct level while optimizing the charge transfer timing, allowing the system to achieve low power consumption without compromising potential stability
2Use of energy by moving object
If charge recovery circuits are added to reduce power consumption, then power consumption decreases, but the circuit configuration becomes complicated
Solution Approach 1:
The patent merges the charge recovery function with the existing common potential generation circuit by integrating the recovery capacitor and diode elements into the same circuit block. This combined approach allows charge recovery to occur within the existing circuit architecture rather than adding completely separate recovery circuitry, thereby reducing power consumption while minimizing the increase in circuit complexity
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 solution effectively reduces power consumption by minimizing the amount of current required to maintain the common potential, achieving lower power usage with a simpler circuit configuration compared to conventional methods.
Implementation Method 1
an anti-parallel diode that is connected between the other end of the charge recovery capacitor and the output potential
Implementation Method 2
a charge recovery capacitor that has one of its ends connected to a stable potential
Data Source
AI summary
A potential generation circuit and a liquid crystal display device are provided that are capable of reducing power consumption with a simple circuit configuration. The potential generation circuit is a potential generation circuit for generating a common potential that is applied to a capacitive load, and includes a differential amplifier that has a positive input receiving a given set potential and a negative input receiving the common potential that is negatively fed back, a current amplifier that amplifies the output of the differential amplifier and outputs the common potential, a charge recovery capacitor that has one of its ends connected to a reference potential, and an anti-parallel diode that is connected between the other end of the charge recovery capacitor and the common potential.