DC-DC Converter Reference Voltage Adjustment for OLED Efficiency
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Solution Overview
Problem
The efficiency of DC-DC converters in organic light emitting display devices deteriorates when the battery voltage changes, leading to image quality defects during the initial driving period.
Innovation Solution
A DC-DC converter design that includes a conversion unit, a feedback voltage generation unit, an error amplifier, and a reference voltage supply unit, which adjusts the first voltage by reflecting changes in the battery voltage through a pulse width modulation control circuit, maintaining a non-emission state during the initial driving period to stabilize the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the DC-DC converter operates with a fixed reference voltage, then the circuit design is simple, but the conversion efficiency deteriorates when battery voltage changes
Solution Approach 1:
The reference voltage is changed from a fixed value to a dynamically adjustable value that adapts to battery voltage changes. The controller dynamically selects different reference voltages based on the detected battery voltage level, enabling the DC-DC converter to maintain optimal conversion efficiency across varying operating conditions while managing complexity through software-based adaptation rather than multiple hardware circuits.
2Stability of the object's composition
If the DC-DC converter uses a fixed reference voltage, then the circuit operation is stable, but image quality defects occur during initial driving period
Solution Approach 1:
Before normal operation begins, the controller performs a preliminary detection of the battery voltage and pre-selects an appropriate reference voltage for the upcoming operating conditions. This preliminary action ensures that when the display device starts operating, the DC-DC converter is already configured with the correct reference voltage, preventing image quality defects during the initial driving period while maintaining stable output voltage throughout operation.
3Loss of energy
If the reference voltage is adjusted in response to battery voltage changes, then the conversion efficiency improves, but the control system complexity increases
Solution Approach 1:
The system adjusts the reference voltage parameter based on detected battery voltage changes. The controller monitors the battery voltage and selects from a set of predefined reference voltage values, changing the reference voltage parameter to match operating conditions. This approach improves conversion efficiency by adapting to voltage variations while keeping control system complexity manageable through discrete parameter selection rather than continuous adjustment.
Data Source
AI summary
a DC-DC converter, including a conversion unit configured to convert a battery voltage input to an input terminal of the DC-DC converter into a first voltage, and to output the first voltage to an output terminal of the DC-DC converter, a feedback voltage generation unit configured to generate a feedback voltage by dividing the first voltage, an error amplifier (AMP) configured to supply, to a pulse width modulation (PWM) control circuit, an error signal indicating a voltage difference between the feedback voltage and a reference voltage, the PWM control circuit being configured to control the conversion unit, corresponding to the error signal, thereby changing the first voltage, and a reference voltage supply unit configured to supply the reference voltage to the error AMP, and to change the reference voltage.