Transmissive Display Auxiliary Layer for Selective Electrode Deposition
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Solution Overview
Problem
Existing transparent display apparatus face challenges in achieving optimal transmittance due to the stacking of conductive and insulating films with different materials, which degrade transparency and desired transmissibility.
Innovation Solution
The display apparatus is designed with an auxiliary layer in the transmissive region and a second electrode only in the display region, where the materials satisfy a specific surface energy difference, ensuring the second electrode is not formed in the transmissive region, thereby enhancing light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple conductive films and insulating films are stacked to form transparent display apparatus, then the display functionality is achieved, but the transmittance and transparency are degraded
Solution Approach 1:
The display apparatus is divided into a display region and a transmissive region. In the transmissive region, the second electrode is intentionally omitted to create a segment with higher light transmittance, while the display region maintains the complete electrode structure for display functionality.
Solution Approach 2:
Different regions of the display apparatus are given different structural characteristics. The display region contains all necessary layers including the second electrode for display operation, while the transmissive region excludes the second electrode to maximize light transmittance, creating local quality differences optimized for each region's function.
2Reliability
If the second electrode is formed across the entire substrate including transmissive region, then electrical completeness is achieved, but light transmittance in transmissive region is reduced
Solution Approach 1:
The electrode structure is segmented by region: the first electrode spans both display and transmissive regions to maintain electrical continuity, while the second electrode is restricted to the display region only, creating a segmented configuration that balances electrical completeness with optical performance.
Solution Approach 2:
The first electrode acts as an intermediary that provides electrical connection and continuity across both the display region and transmissive region, while the second electrode is selectively placed only in the display region to maintain electrical completeness without compromising light transmittance in the transmissive region.
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 significantly improves the transmittance of the transmissive region by preventing the second electrode from being deposited, maintaining high light transmittance without interference from internal components.
Implementation Method 1
the first material and the second material each satisfy Equation 1 below: ST2−ST1>0 mJ/m2, wherein, in Equation 1, ST1 is a surface energy of the first material at 25° C., and ST2 is a surface energy of the second material at 25° C.
Data Source
AI summary
A display apparatus includes: a first substrate and a display unit. The display unit includes a display region and a transmissive region. The display unit further includes: an auxiliary layer disposed in correspondence with the transmissive region; and a second electrode disposed in correspondence with the display region and at least a portion of the transmissive region. The auxiliary layer includes a first material, the second electrode includes a second material, and the first material and the second material each satisfy Equation 1 below: <Equation 1> ST2−ST1>0 mJ/m2, wherein, in Equation 1, ST1 is a surface energy of the first material at 25° C., and ST2 is a surface energy of the second material at 25° C.