Display Driver Power Converting Circuit with Selective DC-DC Converter Switching
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Solution Overview
Problem
As display devices increase in size and resolution, the source driver's current load also increases, posing challenges for conventional power converting circuits to efficiently supply the required source voltages, particularly when using capacitive DC-DC converters, which have limitations in current capacity and space efficiency.
Innovation Solution
A power converting circuit that selectively uses capacitive DC-DC converters, inductive DC-DC converters, or external power supply voltages to generate source voltages based on the amount of source current required, incorporating a converter selecting unit to determine the optimal conversion method, including capacitive and inductive control circuits and converting circuits, and flexible printed circuit configurations to enhance efficiency and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a capacitive DC-DC converter is used to generate source voltages, then the circuit complexity is reduced and space efficiency is improved, but the current capacity is limited and cannot meet high current load requirements
Solution Approach 1:
The patent implements a dynamic converter selection mechanism that automatically switches between capacitive and inductive DC-DC converters based on the detected current load conditions. When the current load exceeds a predetermined threshold, the system transitions from using only capacitive converters to using inductive converters, thereby dynamically adapting the power conversion capability to match the actual current demands of the display panel.
2Reliability
If an inductive DC-DC converter is used instead of a capacitive DC-DC converter, then the current capacity is increased to meet higher current loads, but the device size and complexity increase
Solution Approach 1:
The patent divides the power conversion system into multiple independent modules: a first capacitive DC-DC converter, a second capacitive DC-DC converter, a first inductive DC-DC converter, and a second inductive DC-DC converter. These segmented modules can be selectively activated based on current load requirements, allowing the system to use only the necessary components for the given operating conditions, thereby reducing the effective device size and complexity while maintaining high current capacity when needed.
Solution Approach 2:
The patent creates a universal power conversion system that can perform multiple functions through different converter combinations. The same set of capacitive and inductive converters can serve different current load requirements, making the system adaptable to various operating conditions without requiring separate dedicated circuits for each scenario.
3Illumination intensity
If the display panel size and resolution are increased, then the display performance is improved, but the source driver current load increases beyond the capability of conventional capacitive DC-DC converters
Solution Approach 1:
The patent changes the operational parameters of the power conversion system by introducing inductive DC-DC converters with higher current capacity alongside capacitive converters. The system monitors the current load parameter and adjusts the converter configuration accordingly, enabling it to support the increased power demands resulting from larger display panel sizes and higher resolutions.
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 enables stable and efficient power supply to display panels by adapting to varying current demands, improving voltage conversion efficiency and space efficiency, and increasing the productivity and compatibility of display driver integrated circuits.
Implementation Method 1
a first capacitive DC-DC converter (120) and a first inductive DC-DC converter (140), and generates a positive source voltage by selectively using one of the first capacitive DC-DC converter, the first inductive DC-DC converter
Implementation Method 2
a first capacitive DC-DC converter (120) and a first inductive DC-DC converter (140), and generates a positive source voltage by selectively using one of the first capacitive DC-DC converter, the first inductive DC-DC converter
Data Source
AI summary
A power converting circuit of a display driver includes a positive voltage generator and a negative voltage generator. The positive voltage generator includes a first capacitive DC-DC converter and a first inductive DC-DC converter, and generates a positive source voltage by selectively using one of the first capacitive DC-DC converter, the first inductive DC-DC converter, or a first external power supply voltage. The negative voltage generator includes a second capacitive DC-DC converter and a second inductive DC-DC converter, and generates a negative source voltage by selectively using one of the second capacitive DC-DC converter, the second inductive DC-DC converter, or a second external power supply voltage.