Transparent Electrode Layer for Display Substrate Blind Via
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Solution Overview
Problem
In full-screen mobile phones, the 'blind via' area where the camera is placed often experiences yellowing due to multiple film structures, leading to reduced transmittance and adverse effects on camera shooting performance, as existing technologies result in uneven surfaces and over-etching during dry etching processes.
Innovation Solution
A display substrate design featuring a substrate with a buffer, organic film layer, passivation layer, and a transparent electrode layer in the blind via area, where the transparent electrode layer is formed on the surface of the uneven buffer to enhance thickness uniformity and reduce light interference, using indium tin oxide and a functional layer with specific openings to minimize yellowing and maintain high transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple film structures are placed in the blind via area, then the structural integrity and functionality are improved, but the transmittance decreases and yellowing occurs
Solution Approach 1:
The patent extracts the transparent electrode layer from the standard display area structure and applies it specifically to the blind via area. This separate treatment allows the blind via region to have optimized film structures for transmittance while the rest of the display maintains its standard multi-layer structure for functionality.
Solution Approach 2:
The patent implements different film structure configurations in different areas: the blind via area receives a simplified structure with transparent electrode layer directly on the buffer, while the display area maintains the standard multi-layer structure. This local differentiation optimizes each area for its specific function.
2Illumination intensity
If dry etching is performed to form openings in the blind via area, then the film structures are removed to improve transmittance, but the buffer surface becomes uneven and over-etching occurs
Solution Approach 1:
The patent performs preliminary filling of the blind via area with the transparent electrode layer material before final patterning. This preliminary action ensures that the buffer surface irregularities are covered and compensated, allowing subsequent etching to produce more uniform openings without exposing underlying surface defects.
Solution Approach 2:
The transparent electrode layer acts as an intermediary layer between the uneven buffer surface and the subsequent film structures. This intermediate layer compensates for surface irregularities and provides a uniform baseline for opening formation, preventing over-etching and surface defects.
3Illumination intensity
If the number of film structures in the blind via area is reduced, then transmittance is improved, but the protective and functional coverage is reduced
Solution Approach 1:
The transparent electrode layer in the blind via area serves multiple functions simultaneously: it provides electrical conductivity for the camera component, maintains structural coverage for protection, and enables high transmittance due to its optical transparency. This multi-functionality allows reduced film count without sacrificing protective coverage.
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 effectively alleviates the yellowing issue and maintains transmittance above 90% in the blind via area, improving camera shooting performance and reducing manufacturing costs by using a single patterning process for the transparent and pixel electrode layers.
Implementation Method 1
the transparent electrode layer is used to block electrons emitted from the substrate
Implementation Method 2
the organic film layer is used to transport holes
Data Source
AI summary
A display substrate and a manufacturing method therefor, and a display device. The display substrate comprises: a substrate, the substrate comprising a blind hole area; a buffer layer covering one side of the substrate; an organic film layer provided on the surface of the buffer layer away from the substrate and having a first opening in the blind hole area; a passivation layer provided on the side of the organic film layer away from the substrate and having a second opening in the blind hole area; and a transparent electrode layer covering the passivation layer and the buffer layer in the second opening.