OLED Display Substrate Parallel Electrode IR Drop Reduction
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Solution Overview
Problem
In organic light-emitting diode (OLED) display panels with a top emission structure, the high resistance of the top transmission electrode leads to significant IR Drop, resulting in poor brightness uniformity due to increased resistance and reduced light transmittance.
Innovation Solution
A display substrate design featuring a base substrate with a first electrode, a first auxiliary electrode, a boss, a pixel definition layer, and a second electrode, where the first auxiliary electrode is connected in parallel with the second electrode through a conductive connection part, reducing equivalent resistance and improving light transmittance by forming a hollow structure in the organic functional layer and using a boss with a negative photoresist material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the top transmission electrode is made very thin to ensure light transmittance, then light transmittance is improved, but resistance increases significantly
Solution Approach 1:
The top transmission electrode is divided into a first electrode and a second electrode that are spatially separated and connected through side-surface contact. This segmentation allows each electrode to be optimized independently - the first electrode can be thin for light transmittance while the second electrode provides additional conductive path, thus resolving the contradiction between light transmittance and electrical resistance
Solution Approach 2:
The connection between electrodes is moved from a traditional planar interface to a side-surface contact configuration. The first conductive connection part contacts the side surface of the boss structure, creating a three-dimensional conductive pathway that reduces resistance without compromising the thin-film light-transmitting properties
2Illumination intensity
If the top transmission electrode is made very thin to ensure light transmittance, then light transmittance is improved, but IR Drop increases significantly
Solution Approach 1:
By segmenting the electrode structure into first and second electrodes with separate conductive paths, the current distribution is optimized. The first electrode maintains thin-film properties for light transmittance while the second electrode and its connection structure provide an additional low-resistance pathway, reducing overall IR Drop
Solution Approach 2:
The electrode structure exhibits local quality variations - the first electrode is thin for light transmittance in the display area, while the second electrode and connection parts have optimized thickness and geometry for electrical conduction. This localized optimization resolves the contradiction between light transmittance and energy loss
3Illumination intensity
If the top transmission electrode is made very thin to ensure light transmittance, then light transmittance is improved, but brightness uniformity deteriorates
Solution Approach 1:
The electrode system is segmented into multiple components (first electrode, second electrode, connection parts) that work together to distribute current more uniformly across the display area. This segmentation prevents localized current crowding that would cause brightness non-uniformity, while maintaining thin-film light transmittance properties
Solution Approach 2:
Different regions of the electrode structure have different optimized properties - the first electrode is thin for light transmittance in the active display area, while the second electrode and connection structures have geometries optimized for uniform current distribution, thus achieving both high light transmittance and uniform brightness
Data Source
AI summary
A display substrate and a method of manufacturing the same, and a display panel are provided. The display substrate includes: a base substrate, and a first electrode, a first auxiliary electrode, a boss, a pixel definition layer, an organic functional layer and a second electrode provided on the base substrate. The first auxiliary electrode includes a first conductive connection part contacting a side surface of the boss; the pixel definition layer is provided with a pixel accommodating hole and a slot; the organic functional layer is electrically connected with the first electrode through the pixel accommodating hole; and the second electrode is electrically connected with the first conductive connection part through the slot, so that the second electrode is connected with the first auxiliary electrode in parallel.