DC-DC Converter Voltage Regulation for OLED Luminance Stability
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Solution Overview
Problem
Existing DC-DC converters for organic light emitting display devices increase the voltage of the first pixel power source when a large-capacity battery is used, leading to increased current flow into the organic light emitting diode and inefficient operation, as the luminance becomes higher than set levels and efficiency decreases when the battery's output voltage exceeds the converter's output voltage.
Innovation Solution
A DC-DC converter system with a voltage sensor, regulator, and controller that maintains a constant voltage output for the first pixel power source by bypassing or lowering the battery voltage when it exceeds a set value, using a booster and inverter to generate the necessary pixel power sources, ensuring consistent current flow into the organic light emitting diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a large-capacity battery is used to prolong use-time, then the duration of action is improved, but the voltage output increases causing the first pixel power source voltage to increase and luminance to become higher than set levels
Solution Approach 1:
A regulator circuit is introduced as an intermediary between the battery and the DC-DC converter. The regulator monitors the battery voltage and controls the DC-DC converter to maintain the first pixel power source voltage within a predetermined range, preventing luminance from exceeding set levels while enabling the use of large-capacity batteries for extended operation.
Solution Approach 2:
The system implements a feedback mechanism where the regulator continuously monitors the battery voltage and adjusts the DC-DC converter operation accordingly. When battery voltage exceeds the predetermined range, the regulator controls the converter to reduce the first pixel power source voltage, ensuring stable luminance output despite variations in battery voltage.
2Duration of action of moving object
If the battery output voltage exceeds the DC-DC converter output voltage, then the duration of action is improved, but the efficiency of the DC-DC converter decreases
Solution Approach 1:
The system dynamically adjusts the operation mode of the DC-DC converter based on real-time battery voltage conditions. The regulator monitors battery voltage and switches between different operating modes (bypass mode, boosting mode, or bucking mode) to optimize converter efficiency while maintaining stable output voltage, thereby reducing energy loss even when using large-capacity batteries with higher voltage.
Data Source
AI summary
A DC-DC converter and an organic light emitting display device using the same. Here, a DC-DC converter (500) is provided with a voltage sensor (400) for sensing a battery voltage outputted from a battery (700). A regulator (510) receives the battery voltage from the battery (700). When the battery voltage is a set value or less, the regulator (510) is stopped from bypassing the battery voltage. When the voltage of the inputted power source exceeds the set value, the regulator (510) is driven to lower the battery voltage. When the battery voltage is the set value or less, a controller (600) controls the driving of the regulator (510). A power generator receives the regulated battery voltage to output a first pixel power source and a second pixel power source.