OLED Display Light-Emitting Layer Segmentation for Manufacturing Yield
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Solution Overview
Problem
Prior art OLED display devices face color-mixing issues due to narrower light-emitting layers, which complicates manufacturing and increases errors during the manufacturing process.
Innovation Solution
The OLED display device comprises multiple OLED display units with first and second light-emitting layers disposed side by side between functional layers, each corresponding to at least two sub-pixels, increasing the width of the light-emitting layers and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light-emitting layer width is reduced to accommodate narrower sub-pixels, then the display resolution is improved, but the manufacturing precision deteriorates due to increased errors during light-emitting layer manufacturing
Solution Approach 1:
The invention divides the light-emitting layer into multiple segments (first light-emitting layer and second light-emitting layer) corresponding to different color sub-pixels. Each segment can be manufactured and controlled independently, allowing the overall structure to achieve high resolution while each individual segment maintains manufacturability within standard error tolerances.
2Measurement precision
If the light-emitting layer width is reduced for higher resolution, then the display quality is improved, but the device complexity increases due to more precise manufacturing requirements
Solution Approach 1:
By segmenting the light-emitting layer into distinct regions for different colors, the manufacturing process becomes more manageable. Each segment can be deposited and patterned using standard processes without requiring ultra-precise alignment, thus reducing overall device complexity while maintaining high display resolution.
Solution Approach 2:
The invention applies different local qualities to different regions of the light-emitting layer, with each region optimized for its specific color emission requirements. This allows each local area to be manufactured within standard tolerances rather than requiring the entire structure to meet a single high-precision requirement, thereby reducing manufacturing complexity.
3Measurement precision
If narrower light-emitting layers are used for each sub-pixel, then the pixel density is increased, but the productivity decreases due to more complex and error-prone manufacturing
Solution Approach 1:
The light-emitting layer is segmented into multiple color regions that can be manufactured in parallel or sequence using standard deposition processes. This segmentation allows for higher pixel density while maintaining manufacturing productivity, as each segment can be produced using established processes without requiring excessively tight tolerances that would slow production.
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 alleviates color-mixing problems, enhances manufacturing yield, reduces manufacturing costs, and increases productivity by allowing each light-emitting layer to correspond to multiple sub-pixels, thereby improving the overall performance and efficiency of the OLED display device.
Implementation Method 1
the light-emitting layer is excited by the holes and the electrons to emit a light
Data Source
AI summary
An OLED display device includes a substrate and an OLED display units formed on the substrate, in which n is an integer which is greater than 1. The OLED display unit comprises: a first electrode, a first functional layer, a second electrode, a second functional layer, and a first light-emitting layer and a second light-emitting layer disposed between the first functional layer and the second functional layer; the first functional layer is disposed above the first electrode and the second functional layer is disposed below the second electrode, or, the first functional layer is disposed below the first electrode and the second functional layer is disposed above the second electrode. Wherein, the first light-emitting layer and the second light-emitting layer are disposed side by side in a horizontal direction, and, each of the light-emitting layers corresponds to at least two sub-pixels in the OLED display unit.