OLED Mirror Display Panel Shared Mask Process
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Solution Overview
Problem
Traditional display devices with both mirror and display functions typically have lower display quality compared to those without the mirror function, and there is a need for an organic light emitting display panel that can enhance both display and mirror image quality.
Innovation Solution
An organic light emitting display panel is designed with a base substrate, a pixel defining layer, a light emitting structure, and a mirror pattern that covers the upper surface of the pixel defining layer, using materials like aluminum, chrome, or silver for high reflectivity, and the manufacturing method involves forming a thin film transistor, preliminary pixel defining layer, and mirror layer using a shared mask to simplify the process and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional display device includes both mirror function and display function, then the device can perform both functions, but the display quality deteriorates compared to normal display devices without mirror function
Solution Approach 1:
The device is segmented into distinct functional regions: a display region with OLED structures for image display, and a mirror region with reflective patterns for mirror function. The pixel defining layer and mirror pattern are spatially separated to prevent interference between the two functions, allowing each region to optimize its performance independently.
Solution Approach 2:
Different regions of the substrate are given different local qualities: the display region uses transparent or semi-transparent pixel defining layers to maintain light emission quality, while the mirror region uses highly reflective patterns. This local differentiation allows each region to be optimized for its specific function without compromising the other.
2Manufacturing precision
If separate manufacturing processes are used for pixel defining layer and mirror pattern, then each structure can be optimized independently, but the manufacturing process complexity and cost increase
Solution Approach 1:
The manufacturing processes for the pixel defining layer and mirror pattern are merged into a single integrated process. Both structures are formed simultaneously using the same mask alignment and deposition steps, eliminating the need for separate manufacturing processes while maintaining the ability to optimize each structure's design independently.
Solution Approach 2:
The pixel defining layer serves multiple functions: it defines the pixel structure for OLED fabrication, provides electrical insulation, and in the mirror region, forms the base layer for the reflective mirror pattern. This multi-functionality reduces the need for additional dedicated structures and simplifies the overall manufacturing process.
3Manufacturing precision
If the mirror pattern covers the entire upper surface of the pixel defining layer, then the mirror image quality improves, but the light emission from the display region may be affected
Solution Approach 1:
The mirror pattern coverage is segmented according to functional requirements: in the display region, the mirror pattern covers only the pixel defining layer areas between adjacent OLEDs, leaving the OLED emission areas exposed. In the mirror region, the mirror pattern covers the entire pixel defining layer upper surface to maximize mirror reflectivity. This spatial segmentation allows both display brightness and mirror image quality to be optimized simultaneously.
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 solution improves display quality and mirror image quality while simplifying the manufacturing process and reducing costs by using a shared mask for forming the pixel and mirror patterns, and the mirror pattern functions as an auxiliary electrode to reduce IR drop, enhancing the overall performance of the display panel.
Implementation Method 1
a mirror pattern disposed on an upper surface of the pixel defining layer. The mirror pattern makes contact with the pixel defining layer, and entirely covers the upper surface of the pixel defining layer
Implementation Method 2
An organic light emitting display device includes a pixel having an organic light emitting diode (OLED). The wavelength of the light emitted by the OLED depends on an organic material included in the OLED
Data Source
AI summary
An organic light emitting display panel includes a base substrate, a pixel defining layer disposed on the base substrate, a light emitting structure disposed in an opening of the pixel defining layer, and a mirror pattern disposed on an upper surface of the pixel defining layer. The pixel defining layer defines the opening and includes the upper surface that is in parallel with a surface of the base substrate and a side surface that is connected to the upper surface. The mirror pattern makes contact with the pixel defining layer, and entirely covers the upper surface of the pixel defining layer.