OLED Power Supply Merging DC-DC Converter and PFC Control
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Solution Overview
Problem
Conventional LCD display apparatuses require separate DC-DC converters for backlight and other components, leading to increased cost, size, weight, and thickness, as well as slow response speed, due to the need for high driving voltage for the backlight unit.
Innovation Solution
A power supplying apparatus that applies a voltage of the same level to both OLED display panels and other power consumption parts, using a single DC-DC converter and controlling a PFC unit to turn on/off based on operation states, improving power efficiency by optimizing power factor correction during data voltage charging and light-emitting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If separate DC-DC converters are used for backlight and other components, then high driving voltage can be supplied to the backlight unit, but device complexity, cost, size, weight, and thickness increase
Solution Approach 1:
The patent merges the backlight power supply and other component power supply into a single DC-DC converter. The converter outputs different voltage levels (first voltage for backlight, second voltage for other components) from one unified structure, eliminating the need for separate converters and reducing overall system complexity
Solution Approach 2:
The single DC-DC converter is designed with multi-functionality to serve multiple purposes: it supplies power to both the backlight unit and other display components simultaneously. The converter includes multiple switching elements and control circuits that enable it to perform both voltage conversion functions, making it a universal power supply solution
2Power
If separate DC-DC converters are used for backlight and other components, then adequate power can be supplied to each unit, but weight and thickness increase
Solution Approach 1:
By combining two separate DC-DC converters into one unified converter, the physical components (circuit boards, capacitors, inductors) are reduced, directly decreasing the weight of the display apparatus while maintaining the power supply capability for both backlight and other components
3Power
If separate DC-DC converters are used for backlight and other components, then adequate power can be supplied to each unit, but thickness increases
Solution Approach 1:
The patent integrates multiple power supply functions into a single converter module, reducing the number of stacked components and circuit layers. This integration directly reduces the thickness of the display apparatus while preserving the necessary power output for both backlight and other components
4Reliability
If PFC unit operates continuously, then power factor correction is maintained, but power efficiency decreases during data voltage charging operation
Solution Approach 1:
The patent implements dynamic control of the PFC unit based on the operational state of the display panel. The controller activates or deactivates the PFC unit according to whether the panel is in data voltage charging mode or light-emitting mode, optimizing power efficiency by running the PFC unit only when necessary
Solution Approach 2:
The system changes the operational parameter (PFC unit state) based on the display panel's operational mode. During data voltage charging, the PFC unit is deactivated to improve efficiency, while during light-emitting operations, it is activated to maintain power factor correction, thus adapting to different operational parameters
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 solution enables a slim, lightweight, and efficient OLED display apparatus with improved power efficiency by eliminating unnecessary power losses and reducing the complexity of separate power supply units, enhancing the overall performance and application of OLED technology.
Implementation Method 1
a rectifier which rectifies an input voltage supplied from the power supplying unit
Implementation Method 2
The rectifier may include a power factor correction (PFC) unit which corrects a power factor of the input voltage
Implementation Method 3
a DC-DC converter which converts a level of a DC voltage output from the PFC unit and supplies the DC voltage having the converted level to the display panel
Implementation Method 4
The organic light-emitting display displays an image by using organic light-emitting diodes (OLEDs) which emit light through a recombination of electrons and holes
Data Source
AI summary
A power supplying apparatus, a power supplying method, an organic light-emitting diode (OLED) display apparatus are provided. The OLED display apparatus includes: a plurality of components which are to perform an operation of the OLED display apparatus; a power supplying unit; a rectifier which rectifies an input voltage supplied from the power supplying unit; and a voltage level converter which converts a level of the input voltage rectified by the rectifier and supplies the input voltage having the converted level to the plurality of components.