Concentric OLED Pixel Structure for Color Edge Mitigation
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Solution Overview
Problem
Current AMOLED display panels suffer from a color edge phenomenon when viewed from close distances, and the manufacturing process is costly due to the need for independent precision metal mask evaporation for each color light emitting layer.
Innovation Solution
The display panel features a pixel unit structure with a planar light emitting layer and two concentrically aligned annular light emitting layers of different colors, using the same organic material for transmission layers to simplify manufacturing and reduce precision requirements, along with a boundary defining frame to ensure electrode independence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If independent precision metal mask evaporation is used for each color light emitting layer, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple color light emitting layers (red, green, blue) into a single integrated structure where they share common electrodes and are formed using a unified evaporation process rather than separate precision mask operations for each layer, reducing manufacturing complexity and cost while maintaining display quality
Solution Approach 2:
The patent implements a universal electrode structure where the first electrode serves as a common electrode for all color light emitting layers, and the second electrode functions as both cathode and color conversion layer, eliminating the need for separate precision masks for each color layer and reducing overall manufacturing cost
2Ease of manufacture
If traditional parallel light emitting layer arrangement is used, then manufacturing process is simpler, but color edge phenomenon occurs reducing display effect
Solution Approach 1:
The patent transitions from a traditional parallel arrangement of light emitting layers to a concentric circular arrangement, changing the spatial dimension and configuration of the layers. This dimensional change eliminates the color edge phenomenon by ensuring radial symmetry and uniform light distribution, while the concentric structure can still be manufactured using simplified processes
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 configuration effectively mitigates the color edge phenomenon and significantly reduces manufacturing costs by allowing less precise mask usage during the evaporation process.
Implementation Method 1
OLED luminescence refers to a phenomenon of light emission caused by the anode and cathode carriers pouring-in and recombining, as the organic light emitting layer is driven by an applied electric field. Specifically, electrons and holes as the carriers are shifted from the cathode and the anode respectively to the organic light emitting layer under the effect of the electric field and meet in the organic light emitting layer for recombination to form excitons, which excitons are deactivated to release energy, and the released energy is to excite the light emitting molecules in the organic light emitting layer and the excited light emitting molecules to undergo radiative relaxation and thereby emit visible light.
Data Source
AI summary
An organic light emitting diode display panel and a manufacturing method thereof. The display panel includes a plurality of pixel units arranged in arrays, each pixel unit has a first electrode layer, a second electrode layer and at least three light emitting layers. Each light emitting layer includes a planar light emitting layer and at least two annular light emitting layers disposed concentrically with the planar light emitting layer. The first electrode layer has a planar first electrode at a location that corresponds to the planar light emitting layer, and the first electrode layer has an annular first electrode at a location that corresponds to each annular light emitting layer.