Display Power Supply Circuit With Charge Pump Voltage Segmentation
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Solution Overview
Problem
As the performance and power consumption of computer devices like mobile phones and wearable devices increase, existing power management systems struggle to efficiently manage power voltages, leading to high energy consumption and reduced battery life.
Innovation Solution
A power voltage supply circuit with a voltage converter, charge pump, and regulator that allows for adjustable gain transformation of power voltages, enabling efficient power consumption by varying voltage levels independently across different output nodes, reducing overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power voltage is regulated through traditional PMIC for all output nodes, then voltage stability is improved, but power consumption increases
Solution Approach 1:
The patent segments the power management system into three distinct groups: output nodes directly connected to the voltage converter (first group), output nodes connected through charge pumps (second group), and output nodes connected through regulators (third group). This segmentation allows different power management strategies to be applied to different groups, reducing overall power consumption while maintaining voltage stability where needed.
Solution Approach 2:
The patent introduces dynamic voltage transformation through charge pumps with adjustable gain values, allowing the voltage level at output nodes to be dynamically adjusted based on operational requirements. This dynamic approach enables the system to optimize power consumption by transforming voltage only when and where needed, rather than continuously regulating all output nodes.
2Device complexity
If fixed voltage output is used for all nodes, then circuit simplicity is improved, but adaptability decreases
Solution Approach 1:
The voltage converter serves multiple functions: it can directly supply voltage to output nodes (first group), provide input voltage to charge pumps for transformation (second group), and provide input voltage to regulators for stabilization (third group). This multi-functionality allows a single voltage converter to support both simple fixed voltage outputs and adaptable variable voltage outputs, maintaining circuit simplicity while enhancing versatility.
Solution Approach 2:
The charge pump circuit includes adjustable gain control that enables dynamic voltage transformation ratios. This allows the same hardware circuit to provide different voltage levels at output nodes based on operational requirements, achieving voltage level adaptability without increasing fundamental circuit complexity.
3Adaptability or versatility
If voltage transformation is applied to all output nodes, then voltage adaptability is improved, but power consumption increases
Solution Approach 1:
The patent divides output nodes into groups based on their voltage requirements and transformation needs. Only the second group of output nodes utilizes charge pump transformation, while the first group receives direct voltage and the third group uses regulation. This selective application of voltage transformation significantly reduces power consumption compared to transforming all output nodes, while still providing adequate voltage adaptability for nodes that require it.
Solution Approach 2:
Different power management approaches are applied to different locations (output nodes) based on their specific requirements. The charge pump transformation is applied locally only to output nodes that require voltage transformation, rather than universally to all nodes. This local quality approach optimizes power consumption by applying transformation capability only where needed.
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 allowing for variable voltage output, optimizing energy use in display devices and extending battery life in portable devices.
Implementation Method 1
a charge pump connected between one of the output nodes and the voltage converter and having an adjustable gain. By controlling the gain of the charge pump, a variable voltage may be output through one of the output nodes
Implementation Method 2
The PMIC may receive an input voltage from, for example, a battery, generate a plurality of power voltages based on the input voltage, and supply the generated plurality of power voltages to the driver integrated circuit and the display panel
Implementation Method 3
a regulator connected between the charge pump and the second output node and configured to regulate a transformed power voltage and output an additional power voltage to the second output node
Data Source
AI summary
A power voltage supply circuit for a display device including: a branch node; a voltage converter having an output terminal connected to the branch node, the voltage converter configured to convert an input voltage received from outside, and output a power voltage to the branch node; a first output node connected to the branch node and configured to output the power voltage; a second output node connected to the branch node; and a charge pump connected between the branch node and the second output node and configured to transform the power voltage with different gain values in response to a control signal.