OLED Display Power Management via Mode Switching and Voltage Compensation
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Solution Overview
Problem
Organic light emitting display devices face challenges in reducing power consumption and maintaining image quality, particularly in mobile devices where battery capacity is limited, leading to short usage times and potential image deterioration due to fluctuations in brightness.
Innovation Solution
An organic light emitting display device that operates using a dual power source system, distinguishing between normal and standby modes, and employs a controller to output mode control signals for high frequency and low frequency driving, maintaining a consistent driving current through compensation voltages to prevent brightness fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery capacity is increased to extend usage time, then the power consumption can be reduced, but the device becomes thicker and heavier
Solution Approach 1:
The patent applies parameter changes by switching between two power source voltage levels (first power source voltage and second power source voltage) to optimize power consumption. The display panel operates at different voltage levels depending on the usage mode, thereby reducing overall power consumption without requiring a larger battery capacity, thus avoiding increased device weight.
Solution Approach 2:
The patent implements dynamic operation by switching between normal mode and standby mode with different power consumption characteristics. The controller dynamically adjusts the power source voltage based on the current mode, allowing the device to adapt its power consumption to actual usage requirements, thereby extending usage time without increasing battery capacity or device weight.
2Use of energy by moving object
If the power consumption is reduced by lowering power source voltage, then usage time is extended, but the brightness and image quality deteriorate
Solution Approach 1:
The patent uses dynamic mode switching between normal mode and standby mode to optimize the balance between power consumption and brightness. In normal mode, the display operates at higher brightness with appropriate power consumption. In standby mode, the display switches to lower power consumption at reduced brightness, which is acceptable for idle states. This dynamic adjustment prevents continuous operation at high power consumption while maintaining adequate brightness during active use.
Solution Approach 2:
The patent implements periodic switching between different power source voltages and operating modes based on usage patterns. By periodically transitioning between normal and standby modes, the system maintains acceptable image quality during active periods while reducing power consumption during idle periods, thereby extending overall usage time without compromising user experience.
3Use of energy by moving object
If the device operates in low frequency driving mode to save power, then power consumption is reduced, but the driving current fluctuates causing image quality deterioration
Solution Approach 1:
The patent implements a feedback mechanism where the controller monitors the operating mode and adjusts the power source voltage accordingly. When in standby mode with low frequency driving, the controller provides feedback to maintain appropriate driving current levels, preventing fluctuations that would degrade image quality. This closed-loop control ensures that power consumption is reduced while maintaining reliable image quality.
Solution Approach 2:
The patent applies parameter changes by adjusting the power source voltage level based on the operating mode. In standby mode, the system switches to a second power source voltage that is optimized for low power consumption while maintaining sufficient driving current stability. This parameter adjustment allows the device to operate efficiently in low frequency mode without suffering from current fluctuations and image quality deterioration.
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 effectively reduces power consumption and maintains image quality by optimizing power usage between normal and standby modes, extending battery life and preventing image deterioration in mobile devices.
Implementation Method 1
an organic light emitting display device that employs an organic light emitting diode, which is a spontaneous light emitting device
Data Source
AI summary
An organic light emitting display device can include a display panel that expresses brightness based on a driving current corresponding to a data voltage, a power source unit that supplies power to the display panel, and a controller configured that outputs a mode control signal for determining a normal mode and a standby mode, drives the display panel to display a first frame for a first time period in the normal mode based on the mode control signal, and drives the display panel to display a second frame for a second time period that is longer than the first time period in the standby mode based on the mode control signal, in which the power source unit supplies a compensation voltage to at least one pixel during the standby mode for compensating a change in the data voltage in the pixel.