Semiconductor Device Second Electrode Below First Top Surface
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Solution Overview
Problem
Top-emission display panels face issues with display unevenness and luminance unevenness due to high resistance in the common electrode, leading to degraded display quality and reliability, especially in larger formats where uniformity and seamlessness are critical.
Innovation Solution
The display panel design incorporates a light-emitting element with a first insulating layer, a protective layer, and a conductive layer, where the conductive layer has lower resistivity than the second electrode, and the protective layer includes an inorganic film, preventing impurity entry and ensuring high barrier properties to maintain light transmission while reducing voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a visible-light-transmitting conductive material is used for the common electrode, then light transmission is improved, but the resistance of the common electrode increases
Solution Approach 1:
The common electrode is divided into two separate electrodes: a first common electrode made of visible-light-transmitting conductive material for light transmission, and a second common electrode made of low-resistance conductive material for electrical conduction. This segmentation allows each electrode to optimize its specific function without compromise.
Solution Approach 2:
The first common electrode acts as an intermediary between the light-emitting element and the second common electrode. It transmits light while the second common electrode provides the low-resistance electrical path, mediating between the optical and electrical requirements.
2Area of stationary object
If the screen size is increased, then the display area is improved, but display unevenness and luminance variation worsen
Solution Approach 1:
By segmenting the common electrode into two functional layers, the patent enables larger display areas to be constructed with uniform electrical properties. The second common electrode's low resistance ensures uniform potential distribution across expanded display surfaces, preventing luminance variation.
Solution Approach 2:
The patent changes the electrical conductivity parameter of the common electrode system by introducing the second common electrode with specifically optimized low resistance, allowing larger display areas to maintain uniform electrical characteristics and thus display uniformity.
3Length of moving object
If the thickness of the display panel is reduced, then the portability is improved, but the reliability of the light-emitting element decreases
Solution Approach 1:
The patent employs thin-film structures for the common electrodes and insulating layers, achieving reduced overall thickness while maintaining protective functions. The second common electrode's thin low-resistance film provides electrical conduction without adding significant thickness.
Solution Approach 2:
The patent uses composite material structures where the first common electrode (visible-light-transmitting conductive material) and second common electrode (low-resistance conductive material) are combined with insulating layers to create a thin yet reliable protective system for the light-emitting element.
Data Source
AI summary
A display panel or a display device with high display quality is provided. The display panel includes a light-emitting element, an insulating layer, a protective layer, and a conductive layer. The light-emitting element includes a first electrode, a light-emitting layer, and a second electrode. The light-emitting element emits light to the protective layer side. The insulating layer includes a first opening overlapping with the first electrode. The insulating layer covers an end portion of the first electrode. The light-emitting layer overlaps with the first electrode through the first opening. The second electrode is positioned over the light-emitting layer. The protective layer is over and in contact with the second electrode. The protective layer functions as a protective layer of the light-emitting element. The protective layer includes a second opening overlapping with the insulating layer. The conductive layer is connected to the second electrode through the second opening. The conductive layer functions as an auxiliary wiring of the second electrode.