Voltage Providing Circuit Dynamic Frequency Control
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Solution Overview
Problem
In LCD driving circuits, charge pumps consume excessive power due to redundant current flow when frequently increasing voltage, leading to high power consumption, especially when transitioning from black to white images.
Innovation Solution
A voltage providing circuit that utilizes oscillating circuits to generate clock signals with different frequencies, a detection circuit to compare reference and output voltages, and a selecting unit to control the charge pump, ensuring it operates at high frequency only when necessary, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the charge pump frequently increases voltage to meet different current demands, then the current supply capability is improved, but the power consumption increases due to redundant current flow
Solution Approach 1:
The charge pump circuit dynamically adjusts its operating frequency based on real-time current demand detection. When the back end circuit requires high current (such as during black-to-white image transitions), the charge pump operates at high frequency to provide sufficient current. When current demand is low, it automatically reduces to low frequency operation, thereby eliminating redundant current flow and reducing power consumption while maintaining the capability to supply high current when needed.
Solution Approach 2:
The invention changes the operating frequency parameter of the charge pump circuit according to different operational conditions. By detecting the current state of the back end circuit and adjusting the clock signal frequency accordingly, the system optimizes the balance between current supply capability and power consumption, ensuring high performance only when necessary.
2Speed
If the charge pump operates at high frequency to quickly respond to voltage demands, then the voltage response speed is improved, but the power consumption increases
Solution Approach 1:
The charge pump circuit employs periodic action by alternating between high-frequency and low-frequency operation modes based on detected voltage and current conditions. High-frequency operation is activated only during periods when rapid voltage response is required (such as during image transitions), while low-frequency operation is used during stable states, thereby achieving fast response when needed while minimizing energy consumption during normal operation.
Solution Approach 2:
The system dynamically adjusts the operating frequency of the charge pump based on real-time detection of voltage levels and current demands. This dynamic frequency adjustment allows the circuit to optimize between response speed and power consumption by matching the operating frequency to the actual operational requirements of the LCD display at any given moment.
Data Source
AI summary
A voltage providing circuit for generating an output voltage, which includes: a plurality of oscillating circuits, for providing clock signals with different frequencies; a detection circuit, for generating a detection result according to a reference voltage and the output voltage; a selecting unit, coupled to the oscillating circuits and the detection circuit, for selecting one of the clock signals according to the detection result; and a charge pump circuit, for controlling a charge pump according to the clock signal selected by the selecting unit to generate the output voltage.