OLED Power Line Structure with Reverse Voltage Supply
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Solution Overview
Problem
Existing organic light emitting display apparatuses face challenges in achieving uniform luminance due to voltage drops in power lines, which affect the aperture ratio and display quality.
Innovation Solution
The apparatus includes a power generating unit that provides a first power voltage to anode electrodes and a second power voltage to cathode electrodes, with opposite transmission directions to cancel out voltage drops, and a power line structure with a common, detour, and branch portions to efficiently distribute voltages to subpixels, improving luminance uniformity and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power lines are widened to reduce voltage drops, then power transmission quality is improved, but aperture ratio is reduced and display quality deteriorates
Solution Approach 1:
The patent applies reverse power supply by providing first power voltage to first electrodes and second power voltage to second electrodes in opposite transmission directions. This inversion approach allows voltage drops in opposite directions to cancel each other out, achieving uniform luminance without requiring widened power lines, thus maintaining aperture ratio while ensuring reliable power transmission.
Solution Approach 2:
The patent changes the power supply parameters by providing different power voltages to different electrodes in opposite directions. This parameter change strategy transforms the voltage drop problem into a cancelation opportunity, where the opposite-direction voltage drops compensate for each other, eliminating the need to increase power line width and preserving aperture ratio.
2Stability of the object's composition
If power line width is increased to compensate for voltage drops, then luminance uniformity is improved, but aperture ratio decreases
Solution Approach 1:
By implementing reverse power supply with opposite transmission directions, the patent creates a situation where voltage drops in opposite directions cancel each other out. This inversion mechanism achieves luminance uniformity without requiring increased power line width, thereby maintaining aperture ratio.
Solution Approach 2:
The patent converts the harmful effect of voltage drops into a beneficial mechanism by applying voltages in opposite directions. The voltage drops that would normally cause non-uniform luminance are transformed into compensating factors that cancel each other out, achieving uniform luminance while avoiding the need to widen power lines.
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 enhances luminance uniformity and display quality by minimizing the need to widen power lines, thereby improving the aperture ratio and overall display performance.
Implementation Method 1
a power line transmitting the first power voltage to the first electrodes
Implementation Method 2
an organic light emitting diode which generates light by combination of an electron and a positive hole
Data Source
AI summary
An organic light emitting display apparatus includes a power generating unit and a display panel. The power generating unit generates a first power voltage and a second power voltage. The display panel includes a plurality of organic light emitting elements. The organic light emitting elements have first electrodes to which the first power voltage is applied in a first direction and second electrodes to which the second power voltage is applied in a second direction.