Bottom-Emission OLED Panel with Quantum Dot Film and Reflective Isolation
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Solution Overview
Problem
Conventional top-emission OLED display panels face difficulties in adjusting film thickness, experience significant cathode voltage drops, and have a complex fabrication process, limiting their performance and production efficiency.
Innovation Solution
A bottom-emission OLED display panel design is proposed, featuring a substrate, thin film transistor layer, anode, luminescent material layer, cathode, cathode reflective layer, and a quantum dot film positioned between the cathode and cathode reflective layer, with specific materials and structures to optimize light emission and simplify fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a quantum dot film is placed on the cover in top-emission OLED display panels, then luminous performance is improved, but film thickness adjustment becomes difficult and fabrication process becomes complicated
Solution Approach 1:
The patent inverts the conventional top-emission structure to a bottom-emission structure. The quantum dot film is positioned between the cathode and cathode reflective layer instead of on the cover, reversing the traditional light emission direction and component arrangement. This inversion simplifies the fabrication process while maintaining improved luminous performance.
Solution Approach 2:
The patent changes the spatial dimension of quantum dot film placement from the cover surface (top dimension) to the internal layer between cathode and reflective layer (middle dimension). This dimensional repositioning enables better control over film thickness and simplifies the overall fabrication process.
2Reliability
If conventional top-emission OLED structure is used, then quantum dot film can be added, but cathode voltage drop becomes serious
Solution Approach 1:
The patent introduces a reflective isolation layer as an intermediary between the cathode and quantum dot film. This intermediary layer electrically insulates the cathode while allowing optical reflection, preventing direct electrical contact that causes voltage drop while maintaining the quantum dot film's luminescence function.
3Ease of manufacture
If quantum dot film is positioned between cathode and cathode reflective layer, then fabrication process is simplified, but electrical insulation must be ensured
Solution Approach 1:
The reflective isolation layer serves as an intermediary that simultaneously provides electrical insulation and optical reflection functionality. This single intermediary component simplifies fabrication by combining multiple functions while ensuring reliable electrical insulation between the cathode and quantum dot film.
Solution Approach 2:
The reflective isolation layer is constructed from composite materials that possess both electrical insulating properties and optical reflective properties. This composite material approach enables a single layer to fulfill multiple functional requirements, simplifying the overall device structure and fabrication 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
The design improves luminous efficiency, prevents pixel dot failure due to oxidation, and simplifies the fabrication process, making it suitable for mass production while maintaining high light utilization and color purity.
Implementation Method 1
The quantum dot film has photoluminescence characteristics, and light emitted from the quantum dot film has high color purity and small color shift
Implementation Method 2
a cathode reflective layer and a quantum dot film, the cathode reflective layer is positioned above the cathode and electrically insulated from the cathode by a reflective isolation layer
Data Source
AI summary
A display panel is provided, which includes a light-emitting structure. The light-emitting structure includes an anode positioned on a thin film transistor layer, a luminescent material layer positioned on the anode, and a cathode covering the luminescent material layer. The light-emitting structure further includes a cathode reflective layer and a quantum dot film. The cathode reflective layer is positioned above the cathode and is electrically insulated from the cathode by a reflective isolation layer. The quantum dot film is positioned in the reflective isolation layer that is between the cathode and the cathode reflective layer.