Gate Driving Circuit Voltage Segmentation for LCD Monitor Power Efficiency
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Solution Overview
Problem
High voltage endurance components are costly and time-consuming to manufacture in LCD monitor power circuits, particularly in gate driving circuits, due to the need for high voltage power circuits that require large layout areas and multiple layers, limiting cost-effectiveness and efficiency.
Innovation Solution
A power circuit structure utilizing multiple charge pumps to step-wise convert supply voltage into high and low voltages, with voltage differences managed within medium voltage device endurance limits, eliminating the need for high voltage endurance components by employing only medium and low voltage components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high voltage endurance components are employed in the gate driver, then the required high voltage (25-30V endurance limit) can be achieved, but the layout area increases, manufacturing complexity increases, and cost increases
Solution Approach 1:
The gate driver is divided into multiple independent voltage processing units (first voltage processing unit, second voltage processing unit, third voltage processing unit). Each unit handles a specific voltage conversion task with medium voltage endurance components, avoiding the need for a single high voltage endurance component. This segmentation reduces layout area and manufacturing complexity while achieving the required voltage output.
2Strength
If high voltage endurance components are employed in the gate driver, then the required high voltage can be achieved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive high voltage endurance components with multiple cheaper medium voltage endurance components. Although multiple components are used, each individual component is less expensive and easier to manufacture, resulting in overall cost reduction despite the increased component count.
3Power
If triple voltage charge pumps with 15V range are employed, then high voltage output (15V) can be achieved, but high voltage endurance components are required
Solution Approach 1:
The voltage generation is segmented into multiple stages with different voltage ranges. The first voltage processing unit generates voltages within a first voltage range, the second unit generates voltages within a second voltage range, and the third unit generates voltages within a third voltage range. Each stage uses medium voltage endurance components appropriate for its specific voltage range, avoiding the need for high voltage endurance components while achieving the required output voltage.
4Power
If high voltage power circuits are employed, then high voltage output can be achieved, but manufacturing time increases
Solution Approach 1:
The patent uses multiple medium voltage endurance components that are faster and easier to manufacture than high voltage endurance components. Although the component count is higher, the reduced manufacturing time per component and the availability of standard medium voltage components result in overall reduced manufacturing time.
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
This approach reduces manufacturing costs and time by eliminating the requirement for high voltage endurance components, enabling efficient and cost-effective production of LCD monitor power circuits and gate driving circuits.
Implementation Method 1
a first charge pump, for converting a supply voltage into a first high voltage and a first low voltage
Implementation Method 2
a second charge pump, electrically coupled to the first charge pump, for enhancing the first high voltage to generate a second high voltage
Implementation Method 3
a third charge pump, electrically coupled to the first charge pump, for weakening the first low voltage to generate a second low voltage
Data Source
AI summary
A power circuit includes a first charge pump for converting a supply voltage into a first high voltage and a first low voltage, at least one second charge pump, each for increasing the first high voltage by a first variance value to a second high voltage, and at least one third charge pump, each for decreasing the first low voltage by a second variance value to a second low voltage. A difference between the first high and low voltages is less than a breakdown threshold. The second and third variance margins are less than the breakdown threshold.