Anode Electrode Width Variation for EL Display Uniformity
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Solution Overview
Problem
Electroluminescent display apparatuses experience luminance deviations due to parasitic capacitances between electrodes and signal lines, affecting the performance of each subpixel.
Innovation Solution
The design includes a plurality of unit circuits with a connection electrode connected to the gate electrode of a driving TFT, where the anode electrodes overlap both the gate and connection electrodes, and a bank defines emission areas to minimize luminance deviations by uniformly designing the overlapping regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple signal lines and TFTs are provided in each subpixel to enable electroluminescent display function, then the display functionality is achieved, but parasitic capacitances occur between electrodes and signal lines causing luminance deviation
Solution Approach 1:
The patent applies local quality by making the anode electrode width vary in different regions. Specifically, the anode electrode has a first width in a first region and a second width in a second region, with the second width being greater than the first width. This local variation compensates for parasitic capacitance effects in different areas of the subpixel, thereby reducing luminance deviation while maintaining display functionality.
2Ease of manufacture
If the anode electrode width is uniformly designed, then the manufacturing process is simple, but luminance deviation occurs due to parasitic capacitance variations across different regions
Solution Approach 1:
The patent implements local quality by designing the anode electrode with different widths in different regions. The anode electrode includes a first region with a first width and a second region with a second width greater than the first width. This localized width variation compensates for regional differences in parasitic capacitance, improving luminance uniformity without significantly complicating the manufacturing process.
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 configuration effectively reduces luminance deviations in each subpixel by ensuring consistent overlap of electrodes, thereby improving the display's uniformity and performance.
Implementation Method 1
a light emitting layer is provided between two electrodes (i.e., an anode electrode and a cathode electrode) and emits light with an electric field generated between the two electrodes
Data Source
AI summary
An electroluminescent display apparatus includes a plurality of unit circuits, each of the plurality of unit circuits including a connection electrode and a driving thin film transistor (TFT), the connection electrode of each of the plurality of unit circuits electrically connected to a gate electrode of the driving TFT included in the unit circuit, a plurality of anode electrodes, each of the plurality of anode electrodes connected to the driving TFT of a corresponding unit circuit, a bank covering an edge of each of the plurality of anode electrodes, the bank defining an emission area for each anode electrode, a light emitting layer on each of the plurality of anode electrodes, and a cathode electrode on the light emitting layer. Each of the plurality of anode electrodes overlaps the gate electrode of the driving TFT and the connection electrode of a corresponding one of the plurality of unit circuits.