OLED Anode Transparent Semiconductor Layers for Luminous Efficiency
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Solution Overview
Problem
The production of full-color OLED display devices requires different thicknesses for hole transporting layers of red, green, and blue OLED elements to optimize luminous efficiency, leading to increased production costs and reduced yield due to the complexity of using three fine metal masks (FMMs) for evaporation processes.
Innovation Solution
Configuring the OLED display device with a common anode layer structure using transparent semiconductor layers of varying thicknesses for red, green, and blue elements, allowing for the same evaporation process with one common metal mask, and employing plasma enhanced chemical vapor deposition (PECVD) with three masks to form these layers, thereby simplifying the process and increasing yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If different thicknesses of hole transporting layers are used for red, green, and blue OLED elements to optimize luminous efficiency, then the luminous efficiency is improved, but the device complexity and manufacturing cost increase due to requiring three different FMMs
Solution Approach 1:
The patent segments the optical cavity structure by introducing a dedicated reflective layer at the anode side, separating the light path control function from the hole transporting layer. This allows the hole transporting layer to have uniform thickness while the reflective layer is positioned at different distances from the emitting layer for different color elements, thus maintaining luminous efficiency optimization without requiring different FMMs for each color.
Solution Approach 2:
The patent introduces a reflective layer as an intermediary component between the anode and the emitting layer. This reflective layer acts as a mediator to control the light path length for different color elements by positioning it at different distances from the emitting layer, enabling uniform thickness hole transporting layers to achieve optimized luminous efficiency for all colors without complex FMM requirements.
2Use of energy by moving object
If three different FMMs are used for evaporation processes of red, green, and blue OLED elements, then the luminous efficiency is optimized, but the productivity decreases due to extended process time
Solution Approach 1:
The patent makes the hole transporting layer universal across all color elements by giving it a uniform thickness that works for red, green, and blue OLED elements simultaneously. The light path optimization function is transferred to the reflective layer positioning, which can be adjusted for different colors without changing the hole transporting layer structure. This universality eliminates the need for three different FMMs and enables single-process evaporation, significantly improving productivity.
3Use of energy by moving object
If three different FMMs are used for evaporation processes, then the luminous efficiency is optimized, but the manufacturing cost increases
Solution Approach 1:
The patent merges the hole transporting layer structure across all color elements by using a uniform thickness design. The differentiation for light path optimization is achieved by positioning the reflective layer at different distances from the emitting layer for different colors, rather than using different hole transporting layer thicknesses. This merging of the hole transporting layer structure eliminates the need for three separate FMMs and their associated manufacturing costs, while maintaining optimized luminous efficiency through the reflective layer positioning strategy.
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
This approach enhances the luminous efficiencies of red, green, and blue OLED elements while reducing production costs by eliminating the need for multiple FMMs and leveraging mature inorganic film deposition skills, thus promoting higher product yield and cost savings.
Implementation Method 1
employing plasma enhanced chemical vapor deposition (PECVD) with three masks to form these layers
Implementation Method 2
The Fabry-Perot resonance principle is used to calculate the best light paths to make the red light emitting layers, green light emitting layers, blue light emitting layers respectively at the positions of the second antinodes
Implementation Method 3
The principle of the OLED element is that the illumination generates due to the carrier injection and recombination under the electric field driving of the semiconductor material and the organic semiconductor illuminating material
Data Source
AI summary
Provided are an OLED display device and a manufacture method thereof. By respectively configuring the first transparent semiconductor layer, the second transparent semiconductor layer and the third transparent semiconductor layer in the anode layers of the red OLED element, the green OLED element, the blue OLED element, and setting the same to have various thicknesses to realize that the luminous efficiencies of the red OLED element, the green OLED element, the blue OLED element respectively achieve the best, and the first transparent semiconductor layer, the second transparent semiconductor layer and the third transparent semiconductor layer are deposited and formed by plasma enhanced chemical vapor deposition with three masks. The thicknesses of the hole transporting layers in the red OLED element, the green OLED element, the blue OLED element are the same, thus they can be formed in the same evaporation process with one common metal mask.