OLED Data Driver Low Power Driving Method
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Solution Overview
Problem
Organic light-emitting display devices face challenges in minimizing power consumption and reducing flickering in a simple display mode, which is necessary for user convenience but not a primary operation mode, while maintaining effective information display.
Innovation Solution
The implementation of a low power driving method that includes a data driver and gate driver configuration, where a specific voltage is supplied to subpixels after initial data voltages are sequentially output, either matching the highest data voltage or differing by a predetermined value, to prevent leakage current and reduce flickering, allowing for a simple display mode with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple display mode is provided for user convenience, then user convenience is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by implementing two distinct display modes: a normal display mode with higher refresh rate for full image display, and a simple display mode with lower refresh rate for minimal information display. The system periodically switches between these modes based on operational needs, allowing the display to consume less power during simple display mode while maintaining user convenience for essential information display.
2Ease of operation
If a simple display mode is provided for user convenience, then user convenience is improved, but flickering occurs
Solution Approach 1:
The patent applies parameter changes by adjusting the refresh rate parameter differently for different display modes. In simple display mode, a lower refresh rate is used to reduce power consumption, while in normal display mode, a higher refresh rate is used to eliminate flickering. This dynamic parameter adjustment allows the system to balance power savings with flicker prevention based on the current display mode.
3Loss of information
If data voltages are sequentially supplied to subpixels, then image information is displayed, but leakage current occurs causing luminance degradation
Solution Approach 1:
The patent applies preliminary action by pre-charging the storage capacitor in the subpixel circuit before the actual data voltage is applied. This preliminary charging ensures that the capacitor is ready to maintain the data voltage for the required period, preventing leakage current from causing luminance degradation. The storage capacitor is charged to the appropriate voltage level in advance, so when the display mode switches or the refresh cycle occurs, the subpixel maintains stable luminance without degradation.
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 prevents flickering in the simple display mode, ensuring user convenience by maintaining necessary information display while minimizing power usage and luminance degradation.
Implementation Method 1
organic light-emitting diodes (OLEDs) able to emit light by themselves
Data Source
AI summary
An organic light-emitting display device includes an organic light-emitting display panel having a plurality of subpixels connected to data lines and gate lines; a data driver driving the data lines; and a gate driver driving the gate lines, wherein the organic light-emitting display device has a first mode having a first refresh rate and a second mode having a second refresh rate that is lower than the first refresh rate, the second mode having a first period and a second period that is subsequent to the first period, and wherein, in the first period of the second mode, the data driver subsequently supplied data voltages to at least two of the plurality of subpixels, and in the second period of the second mode, the data driver supplies a specific voltage to the plurality of subpixels, the specific voltage being the same as one of at least two of the data voltages sequentially supplied to the at least two subpixels.