OLED Display Wire Length Compensation for IR-Drop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Non-uniform luminance of OLED pixels due to IR-drop caused by varying current-transmitting paths and resulting differences in display potentials.
Innovation Solution
The OLED display is divided into sub-display regions with conducting wires of different lengths, where longer wires have higher resistance, allowing the power supply to provide varying voltages to ensure that display potentials across all pixels are uniform by adjusting voltages at the terminals of these wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single conducting wire is used to supply power to all pixels, then the device complexity is reduced, but the display potentials become non-uniform due to different current-transmitting paths causing different IR-drop
Solution Approach 1:
The patent segments the display region into multiple sub-display regions (first sub-display region and second sub-display region), and assigns separate conducting wires to each sub-region. This segmentation allows independent voltage control for each sub-region, compensating for the different IR-drop values caused by varying current-transmitting path lengths. The first conducting wire supplies voltage to pixels in the first sub-display region, while the second conducting wire supplies voltage to pixels in the second sub-display region, ensuring uniform display potentials across all pixels.
2Manufacturing precision
If conducting wires of different lengths are used for different sub-display regions, then the display potential uniformity is improved by compensating IR-drop, but the device complexity increases
Solution Approach 1:
The patent applies local quality by making the second conducting wire longer than the first conducting wire to match the specific needs of different sub-display regions. The second sub-display region, being farther from the power supply, requires a longer conducting wire to achieve comparable voltage delivery. This local adaptation of wire length allows each sub-region to receive appropriate voltage compensation for its specific IR-drop characteristics, ensuring uniform display potentials while maintaining a relatively simple overall structure.
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 ensures that display potentials across all pixels are substantially the same, thereby addressing the issue of non-uniform luminance caused by IR-drop.
Implementation Method 1
The length of the second conducting wire is longer than that of the first conducting wire so that the resistance of the second conducting wire is larger than that of the first conducting wire
Implementation Method 2
the different current-transmitting paths cause different voltage drops (that is the IR-drop)
Data Source
AI summary
An OLED display includes an OLED panel, two conducting wires and a power supply. A display region of the OLED panel is divided into two sub-display regions. The two conducting wires are both disposed on the panel and out of the display region, and first terminals of the two conducting wires are electrically coupled to pixels in the first sub-display region and the second sub-display region respectively. The length of a conducting wire is longer than that of another conducting wire so that the resistance of the conducting wire is larger than that of the said another conducting wire. The power supply provides a relatively high voltage and a relatively low voltage to the second terminals of the relatively long conducting wire and the relatively short conducting wire respectively, so that the voltages of the first terminals of the two conducting wires are substantially the same.