Transparent Display Capping Layout for Transmittance and Brightness
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Solution Overview
Problem
Current transparent display devices face challenges in achieving optimal light transmittance and luminescent efficiency due to unsatisfactory optical characteristics, particularly in the manufacturing process where insulation layers and capping structures can hinder these properties.
Innovation Solution
The method involves forming a capping structure with different thicknesses in the pixel and transmission regions using a mask that shifts to create specific thickness profiles for the first and second capping layers, optimizing the structure to enhance light transmittance and luminescent efficiency while reducing manufacturing time and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform capping structure is formed over the entire substrate including transmission region, then manufacturing process is simplified, but light transmittance in transmission region deteriorates
Solution Approach 1:
The substrate is divided into pixel region and transmission region, and the capping structure is segmented accordingly - formed only in the pixel region and not in the transmission region. This segmentation allows the transmission region to maintain high light transmittance while the pixel region receives the protective capping structure.
Solution Approach 2:
Different regions of the substrate are given different structural qualities - the pixel region has a capping structure for protection and insulation, while the transmission region remains uncapped to maximize light transmittance. This local differentiation optimizes each region for its specific function.
2Reliability
If insulation layers with different materials are stacked to improve device performance, then optical characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The capping structure is extracted from the transmission region while being retained in the pixel region. This selective removal simplifies the overall structure in the transmission area, reducing manufacturing complexity while maintaining necessary functionality in the pixel region.
3Use of energy by moving object
If capping structure thickness is increased to improve luminescent efficiency, then light output is enhanced, but manufacturing time and cost increase
Solution Approach 1:
The capping structure is applied partially - only in the pixel region where luminescent efficiency is needed, and not in the transmission region. This partial application achieves the necessary luminescent performance while reducing manufacturing time and material usage compared to full-coverage capping.
Data Source
AI summary
In a method of manufacturing a transparent display device, a substrate including a pixel region and a transmission region may be provided. A first electrode may be formed on the substrate in the pixel region, and a display layer may be formed on the first electrode. A second electrode facing the first electrode may be formed on the display layer, and a capping structure including a first capping layer and a second capping layer may be formed on the second electrode. The first capping layer may be formed on the second electrode in the pixel region and a first region of the transmission region by using a mask that has an opening, the mask may be shifted, and the second capping layer may be formed on the second electrode in the pixel region and a second region of the transmission region by using the shifted mask.