OLED Anode Capacitance via Vertical Stacking
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Solution Overview
Problem
Current organic light emitting diode (OLED) displays face challenges in achieving high luminescence with low power consumption due to limitations in anode electrode capacity and aperture ratio, which are restricted by parasitic capacitance and storage capacitance requirements.
Innovation Solution
The solution involves enhancing the anode capacitance by forming additional capacitance in parallel with the anode capacitance, achieved by overlapping expanded portions of the anode electrode with the driving current line, without increasing the storage capacitance or pixel area, thus maintaining a high aperture ratio and reducing anode voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the anode electrode capacity is increased to improve luminescence, then the luminescence intensity increases, but the pixel area increases and the aperture ratio decreases
Solution Approach 1:
The patent extends the anode electrode in the vertical direction (stacking direction) by forming it on the color filter layer rather than directly on the substrate. This dimensional change allows the electrode to occupy space in the Z-direction, effectively increasing its capacity without expanding the horizontal pixel area footprint.
Solution Approach 2:
The anode electrode is nested within the pixel structure by positioning it on top of the color filter layer, which itself is within the pixel area. This nesting arrangement allows the electrode to utilize the vertical space within the existing pixel boundaries, increasing capacity without increasing the overall pixel area.
2Stability of the object's composition
If the storage capacitance is increased to reduce anode voltage variations, then the luminescence stability improves, but the pixel area increases
Solution Approach 1:
The color filter layer serves dual functions: it provides color filtering for the display and simultaneously acts as a substrate for the anode electrode, enabling the electrode to form additional capacitance with the driving current line. This multi-functionality allows the same structural element to address both display quality and electrical stability requirements.
Solution Approach 2:
The patent merges the function of the color filter layer with the electrode support structure. By forming the anode electrode on the color filter layer rather than on a separate substrate, the design combines color filtering and electrode positioning functions into a single integrated structure, maximizing space utilization.
3Illumination intensity
If the anode electrode is expanded to form additional capacitance, then the anode capacitance increases and luminescence improves, but the manufacturing complexity increases
Solution Approach 1:
The color filter layer serves its primary function of color filtering while simultaneously providing structural support for the anode electrode. This self-service approach allows the same layer to fulfill multiple roles, reducing the need for additional dedicated structures and simplifying the overall device architecture.
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 results in increased luminescence with the same power consumption, enhancing the aperture ratio and display quality by compensating for anode capacitance without affecting the manufacturing process or costs.
Implementation Method 1
The organic light emitting diode radiates the lights due to the energy from the excition formed at the excitation state in which the hole and the electron are recombined at the emission layer EML
Implementation Method 2
an additional capacitance formed by overlapping expanded portions of the anode electrode with the driving current line
Data Source
AI summary
The present disclosure relates to an organic light emitting diode display having high luminescence. The present disclosure suggests an organic light emitting diode display comprising: a data line, a scan line and a driving current line defining a pixel area on a substrate; an anode electrode formed within the pixel area; an additional capacitance formed by overlapping expanded portions of the anode electrode with some portions of the driving current line; a bank defining a light emitting area in the anode electrode; an organic emission layer formed on the anode electrode; and a cathode electrode formed on the organic emission layer. The present disclosure suggests high luminescence organic light emitting diode display by including an additional capacitance for increasing the anode capacitance.