Transparent Conductive Layer Thickness Variation in AMOLED Array Substrates
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Solution Overview
Problem
The existing methods for adjusting the length of sub-pixel microcavity structures in AMOLED display panels require multiple deposition and patterning processes for transparent conductive layers, leading to increased complexity and decreased yield.
Innovation Solution
Forming transparent conductive layers of different thicknesses on reflective anode layers of sub-pixels in the same layer as metal layers, allowing for varying thicknesses without additional process steps, thereby simplifying the manufacturing process and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple deposition and patterning processes are used to adjust transparent conductive layer thickness, then the microcavity structure length can be adjusted to improve color gamut, but the number of process steps increases and manufacturing complexity increases
Solution Approach 1:
The transparent conductive layer is segmented into different thickness regions corresponding to different sub-pixel types (red, green, blue). Each sub-pixel receives a specific thickness of transparent conductive layer material during a single deposition process, enabling microcavity length adjustment without multiple patterning steps. This segmentation is achieved through a single deposition process with spatially controlled material distribution.
Solution Approach 2:
Different regions of the transparent conductive layer are given different local qualities (thicknesses) to optimize the microcavity structure for each sub-pixel type. The red sub-pixel receives a first thickness, green sub-pixel receives a second thickness, and blue sub-pixel receives a third thickness, allowing each region to have optimized optical properties for its specific function while being formed in a single process step.
2Manufacturing precision
If multiple deposition and patterning processes are used to adjust transparent conductive layer thickness, then the microcavity structure length can be adjusted, but the manufacturing cost increases and yield decreases
Solution Approach 1:
The transparent conductive layer material is deposited with the correct spatial distribution of thicknesses in a preliminary single deposition process, before any patterning or additional processing steps. This preliminary action establishes the correct microcavity lengths for all sub-pixels in one step, preventing the need for subsequent corrective patterning operations that would reduce yield and increase complexity.
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 enables the formation of transparent conductive layers of different thicknesses on sub-pixels without increasing the number of process steps, reducing the likelihood of defective products and improving the efficiency of the manufacturing process.
Implementation Method 1
a pass rate of light waves of different wavelengths can be obtained by adjusting a length of a sub-pixel microcavity structure
Implementation Method 2
the lengths of the microcavity structures of different sub-pixels can be adjusted to improve the color gamut of the display panel
Data Source
AI summary
The present disclosure relates to the field of display technologies, and provides an array substrate. The array substrate includes a plurality of pixel units distributed in an array, each of the pixel units includes a plurality of sub-pixels, and each of the sub-pixels includes at least one metal layer and a light emitting layer. At least one of the sub-pixels further includes a reflective anode layer formed in the same layer as one of the at least one metal layer, where the reflective anode layer has a transparent conductive layer at a side of the reflective anode layer adjacent to the light emitting layer, and transparent conductive layers of at least two different sub-pixels have different thicknesses.