OLED Display Power Line Merged with Capacitor Electrodes
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Solution Overview
Problem
The existing organic light emitting diode (OLED) display devices face limitations in increasing transmittance due to the presence of driving elements, which reduces the transparent area and affects emission efficiency and resolution, especially in transparent displays where a sufficient capacitance is required for light emission.
Innovation Solution
The OLED display device design includes a vertically long power line that overlaps with capacitor electrodes to generate storage capacitors, increasing total capacitance without enlarging the capacitor electrodes, thereby expanding the emitting area and improving transmittance and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area of capacitor electrodes is enlarged to increase capacitance, then the capacitance of the storage capacitor increases, but the transparent area is reduced and transmittance decreases
Solution Approach 1:
The power line is merged with the capacitor electrode structure to form an integrated component. The power line serves dual functions: supplying power to the pixel circuit and acting as one of the capacitor electrodes. This merging eliminates the need for separate capacitor electrode structures, thereby increasing transparent area while maintaining sufficient capacitance.
Solution Approach 2:
The power line is designed to perform multiple functions simultaneously: it acts as a power supply conductor, a capacitor electrode, and a structural element defining the pixel region boundary. This multi-functionality reduces the total area required for separate components, increasing the transparent area available for light transmission.
2Reliability
If the area of capacitor electrodes is enlarged to increase capacitance, then the capacitance of the storage capacitor increases, but the emitting area is reduced and emission efficiency decreases
Solution Approach 1:
The power line and capacitor electrode are merged into a single integrated structure. This eliminates the need for separate capacitor electrode areas, thereby maximizing the emitting area while ensuring sufficient capacitance through the integrated power line structure.
3Area of stationary object
If the pixel region area is reduced to increase transmittance, then the transmittance increases, but the resolution decreases
Solution Approach 1:
The power line is merged with the capacitor electrode structure, allowing the pixel region to be minimized. This integration enables the transparent area to be maximized while maintaining sufficient pixel circuit functionality, thereby achieving high transmittance without sacrificing resolution.
4Reliability
If the gap distance between capacitor electrodes is decreased to increase capacitance, then the capacitance increases, but the manufacturing precision requirements increase
Solution Approach 1:
The power line and capacitor electrode are formed as an integrated structure in the same fabrication process step. This merging eliminates the need for separate electrode formation and gap control processes, thereby reducing manufacturing complexity and precision requirements while achieving sufficient capacitance.
Data Source
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AI summary
An organic light emitting diode display device in accordance with various embodiments may include: a pixel region (PX) defined by a gate line (GL) and a data line (DL) and having an emitting area (EA) and a transparent area (TA); at least one driving element (330) disposed in the emitting area (EA); a power line (VL) overlapping the emitting area (EA) and connected to the at least one driving element (330); a first capacitor electrode (310) disposed in the emitting area (EA) and overlapping the power line (VL), wherein the power line (VL) and the first capacitor electrode (310) form a first storage capacitor (C1); and a second capacitor electrode (320) disposed in the emitting area (EA) and overlapping the first capacitor electrode (310), wherein the first capacitor electrode (310) and the second capacitor electrode (320) form a second storage capacitor (C2).