OLED Power Supply Circuit Eliminates DC-DC Converter
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Solution Overview
Problem
Conventional power supply devices for OLED displays using the simultaneous emission method require high power consumption due to the need for a DC-DC converter to generate variable power voltage, which complicates the circuit structure and increases power loss.
Innovation Solution
A power supply device with a switching mode power supply (SMPS) circuit unit and a PWM control unit that eliminates the DC-DC converter by controlling the voltage level at the first stage of the electric transformer, generating a variable power voltage based on the image load, and providing a first power voltage with logic high and low levels to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a DC-DC converter is used to generate variable power voltage in the simultaneous emission method, then the power voltage can be adjusted according to image load, but the power consumption increases and circuit complexity increases
Solution Approach 1:
The patent extracts and removes the DC-DC converter from the power supply circuit. Instead of using a separate DC-DC conversion stage, the invention directly generates variable power voltage through the SMPS circuit unit by controlling the duty cycle of the switching signal, thereby eliminating the component that causes additional power loss and complexity
Solution Approach 2:
The patent merges the voltage conversion and variable voltage generation functions into a single SMPS circuit unit. The electric transformer in the SMPS circuit directly produces the variable power voltage needed for simultaneous emission by adjusting the duty cycle, combining what were previously separate functions into one integrated circuit
2Adaptability or versatility
If a DC-DC converter is used to generate variable power voltage, then the power voltage can be adjusted according to image load, but the circuit structure becomes complicated
Solution Approach 1:
The patent removes the DC-DC converter from the circuit, simplifying the overall structure. The power supply circuit now consists of the SMPS unit directly generating variable voltage through duty cycle control, eliminating unnecessary conversion stages and reducing circuit complexity
Solution Approach 2:
The invention merges multiple functions into the SMPS circuit unit, which now handles both the power conversion and variable voltage generation that previously required separate DC-DC converter stages, resulting in a more compact and simpler circuit architecture
3Adaptability or versatility
If a DC-DC converter is used to generate variable power voltage, then the power voltage can be adjusted according to image load, but additional power loss occurs
Solution Approach 1:
The patent extracts and eliminates the DC-DC converter that was causing additional power loss. The SMPS circuit unit now directly generates the variable power voltage needed for simultaneous emission, removing the intermediate conversion stage that dissipates energy as heat
Solution Approach 2:
The patent converts the potential harm of complex power conversion into a benefit by using duty cycle control in the SMPS circuit. Instead of losing energy in DC-DC conversion, the system efficiently generates variable voltage through pulse-width modulation, turning a potential weakness into an energy-efficient solution
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 reduces power consumption by varying the voltage level according to the image load, simplifies the circuit structure, and prevents additional power loss, resulting in a more efficient and cost-effective power supply for OLED displays.
Implementation Method 1
an electric transformer having a first stage and a second stage, the SMPS circuit unit configured to generate a second stage output voltage by using the electric transformer
Implementation Method 2
a pulse width modulation (PWM) control unit that controls a voltage level of the second stage output voltage by providing a control signal to the first stage of the electric transformer
Implementation Method 3
a power switching unit that receives the second stage output voltage, and further configured to switch the second output voltage to generate a first power voltage that has a logic high level and a logic low level in one frame
Data Source
AI summary
A power supply device includes an SMPS circuit including an electric transformer having first and second stages, the SMPS circuit generating a second stage output voltage using the electric transformer, a power switcher receiving and switching the second stage output voltage to generate a first power voltage having logic high and low levels in one frame, and a PWM controller controlling a voltage level of the second stage output voltage by providing a control signal to the first stage. The first power voltage is simultaneously provided to a plurality of pixels, and a magnitude of the logic low level is increased or decreased according to a magnitude of an image load, where the magnitude of the image load is dependent on a color and a gradation level of an image to be displayed in a next frame.