OLED Cathode Recessed Conductive Sections
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Solution Overview
Problem
Top-emitting OLED display devices face issues with non-uniform light emission and high power consumption due to the high resistance of the metal cathode layer, which leads to pronounced voltage drops and heat generation, affecting the overall performance and efficiency of the display.
Innovation Solution
The OLED display panel incorporates electrically conductive sections located in recessed areas of the cathode layer, connected in parallel to reduce resistance and improve light uniformity, using materials like nanometer silver or PEDOT/PSS, and formed through processes such as inkjet printing to minimize mask usage and avoid damaging other layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the thickness of the cathode layer is reduced to improve light transmittivity, then light exit ratio is improved, but resistance of the cathode layer increases causing voltage drops and non-uniform light emission
Solution Approach 1:
The patent applies local quality by creating recessed sections in the cathode layer at non-light-emitting areas, allowing the cathode to have different thicknesses in different locations. The recessed sections contain additional electrically conductive materials with lower resistivity, providing localized resistance reduction without affecting the overall thin cathode structure needed for light transmission.
Solution Approach 2:
The patent transitions from a two-dimensional uniform cathode layer to a three-dimensional structure with recessed sections. By adding vertical depth to the cathode layer at specific locations, the patent creates pockets for low-resistivity conductive materials, effectively adding a dimensional aspect that provides resistance reduction while maintaining the overall thin profile for light transmission.
2Illumination intensity
If the thickness of the cathode layer is reduced to improve light transmittivity, then light exit ratio is improved, but power consumption increases due to higher resistance
Solution Approach 1:
The patent reduces power consumption by locally modifying the cathode structure only in non-light-emitting areas. The recessed sections filled with low-resistivity conductive materials are strategically placed where they won't interfere with light emission, providing resistance reduction and associated power savings without compromising the thin cathode design needed for high light exit ratio.
3Illumination intensity
If the thickness of the cathode layer is reduced to improve light transmittivity, then light exit ratio is improved, but heat generation increases affecting operational stability
Solution Approach 1:
The patent addresses heat generation by implementing recessed sections with low-resistivity conductive materials in the cathode layer at non-emitting areas. These localized modifications reduce electrical resistance and associated Joule heating, improving thermal management and operational stability while preserving the overall thin cathode structure necessary for high light transmission efficiency.
Data Source
AI summary
This disclosure relates to the field of display technologies, and discloses an OLED display panel, a method for fabricating the same, and a display device, and the OLED display device includes: a first substrate; a pixel definition layer located on the first substrate, and including a plurality of hollow light-emitting areas, and first recessed sections located between adjacent light-emitting areas; a cathode layer located on a side of the pixel definition layer away from the first substrate, and comprising corresponding second recessed sections corresponding in position to the first recessed sections; and electrically conductive sections located on a side of the cathode layer away from the pixel definition layer, and located in the second recessed sections.