Electroluminescent Display Sub-Pixel Capacitor Merging
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Solution Overview
Problem
Electroluminescent display devices face limitations in achieving high resolution due to the need for increased capacitance in sub-pixel capacitors, which requires larger pixel areas, making it challenging to maintain voltage effectively without expanding the sub-pixel size.
Innovation Solution
The implementation of both a first and second capacitor in each sub-pixel, with the capacitors overlapping between adjacent sub-pixels, allows for enhanced capacitance without increasing the sub-pixel area, thereby enabling ultra-high resolution displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitance of the capacitor is increased to improve voltage maintenance properties, then the voltage maintenance properties are improved, but the area of the sub pixel must be increased
Solution Approach 1:
The patent merges the capacitors of adjacent sub-pixels by making the second electrode of the capacitor in one sub-pixel serve as the first electrode of the capacitor in the adjacent sub-pixel. This shared electrode structure allows both sub-pixels to utilize the same physical space for capacitor formation, effectively doubling the capacitance without increasing the sub-pixel area.
Solution Approach 2:
The second electrode of the capacitor in one sub-pixel serves dual functions: it acts as the capacitor electrode for the first sub-pixel and simultaneously serves as the first electrode for the capacitor in the adjacent second sub-pixel. This multi-functional design allows a single structural element to contribute to the capacitance of multiple sub-pixels.
2Quantity of substance
If the area of the sub pixel is increased to improve capacitance, then the capacitance is improved, but the resolution of the display device is reduced
Solution Approach 1:
By combining the capacitor structures of adjacent sub-pixels through shared electrodes, the patent achieves higher capacitance values without increasing the physical footprint of individual sub-pixels. This allows more sub-pixels to be packed into the same display area, thereby maintaining or improving resolution while achieving the required capacitance for voltage maintenance.
Solution Approach 2:
The patent extends the capacitor structure into the vertical dimension by creating overlapping electrode arrangements between adjacent sub-pixels. The second electrode of one sub-pixel capacitor overlaps with the first electrode of the adjacent sub-pixel capacitor, utilizing three-dimensional space rather than merely expanding in the planar dimension, thus increasing capacitance without increasing sub-pixel area.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
Disclosed is an electroluminescent display device, wherein a first electrode of a first sub pixel includes a first lower electrode and a first upper electrode, a first electrode of a second sub pixel includes a second lower electrode and a second upper electrode, a first electrode of a third sub pixel includes a third lower electrode and a third upper electrode, a distance between the first lower electrode and the first upper electrode, a distance between the second lower electrode and the second upper electrode, and a distance between the third lower electrode and the third upper electrode are different from one another, the third upper electrode includes a third lower layer and a third upper layer, and the third lower layer is formed in the same pattern as that of the third lower electrode in an upper surface of the third lower electrode.