OLED Display Voltage Control for Standby Power Reduction
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Solution Overview
Problem
Organic light-emitting display devices face challenges in reducing power consumption and adjusting luminance without adjusting data voltages, particularly in mobile devices with limited battery capacity and varied functionalities.
Innovation Solution
The implementation of an organic light-emitting display device and driving method that utilizes a display panel operating in both normal and standby modes, with distinct voltage levels for each mode, where the power source supplies a first voltage for normal mode and a second, lower voltage for standby mode, allowing for adjustable luminance and reduced power consumption without altering data voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display device operates in normal mode with higher voltage to maintain luminance, then luminance quality is improved, but power consumption increases
Solution Approach 1:
The display device dynamically switches between normal mode and standby mode based on operational requirements. The mode control signal dynamically adjusts the voltage supplied to the driving transistor, allowing the system to adapt luminance output to actual usage conditions, thereby reducing power consumption during standby while maintaining quality during normal operation.
Solution Approach 2:
The invention changes the voltage parameter supplied to the display panel based on operational mode. In normal mode, a first voltage is supplied to maintain adequate luminance, while in standby mode, a second voltage (different from the first voltage) is supplied to reduce power consumption. This parameter change allows the system to optimize between luminance quality and energy efficiency.
2Use of energy by moving object
If the display device reduces driving current to lower power consumption, then energy efficiency is improved, but luminance output decreases
Solution Approach 1:
The system dynamically adjusts operating parameters based on mode control signals. During standby mode, the system accepts reduced luminance in exchange for lower power consumption, while during normal mode, full luminance performance is restored. This dynamic adjustment allows flexible optimization of the trade-off between energy efficiency and luminance output.
Solution Approach 2:
In standby mode, the system applies partial action by supplying reduced voltage and accepting reduced luminance output, which is sufficient for low-power operation. In normal mode, full action is applied with adequate voltage supply to achieve required luminance levels. This partial/excessive action principle allows the system to use only the necessary amount of power for each operational state.
3Adaptability or versatility
If the voltage level is adjusted to control luminance, then luminance adjustment capability is improved, but device complexity increases
Solution Approach 1:
The mode control signal serves multiple functions: it selects between normal and standby modes, controls voltage level selection, and manages the transition between different power consumption states. This multi-functionality reduces the need for separate control mechanisms for each function, thereby limiting the increase in device complexity while maintaining luminance adjustment capability.
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 approach effectively reduces power consumption and allows for luminance adjustment in organic light-emitting display devices, extending battery life in mobile devices by minimizing power usage during standby modes without requiring changes to data voltages.
Implementation Method 1
organic light-emitting diodes (OLEDs) able to emit light by themselves
Data Source
AI summary
An organic light-emitting display device can include a display panel including a plurality of pixels and configured to express luminance based on a driving current corresponding to a data signal for providing a data voltage and a first power; a control circuit configured to output a first mode control signal corresponding to a normal mode and a second mode control signal corresponding to a standby mode for providing lower luminance than the normal mode; and a power source configured to supply the first power to the display panel at a first voltage level, in response to receiving the first mode control signal corresponding to the normal mode, and supply the first power to the display panel at a second voltage level that is lower than the first voltage level, in response to receiving the second mode control signal corresponding to the standby mode.