OLED Display Filler Height Ratio for Shock Absorption
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Solution Overview
Problem
Insufficient filler in OLED display panel assemblies compromises mechanical strength by forming air bubbles at bent portions, leading to inadequate protection against external impacts.
Innovation Solution
A sufficient amount of filler, specifically a silicon-based material, is applied between the display substrate and encapsulation substrate, with a height ratio of at least 1.2 times that of the OLED array to enhance mechanical shock absorption and sealing, using a frit-based sealing member to maintain the structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a sufficient amount of filler is applied in the display panel assembly, then mechanical strength and impact protection are improved, but air bubble formation at bent portions is prevented
Solution Approach 1:
The filler is applied in advance to the display substrate before assembling the encapsulation substrate, ensuring that the filler is already in position to absorb impacts and prevent air bubble formation from the outset. This preliminary application ensures complete coverage and proper distribution of the filler material throughout the display panel assembly.
Solution Approach 2:
The viscosity and application parameters of the filler are optimized to ensure proper flow and distribution. By controlling the filler's rheological properties and application conditions, the system achieves complete filling of the display panel assembly without trapping air bubbles, even when the filler sags under gravity.
2Strength
If the filler height is increased to more than 1.2 times the OLED array height, then shock absorption capability is improved, but the volume of the display panel assembly increases
Solution Approach 1:
The filler's viscosity parameters are precisely controlled to achieve optimal sagging behavior. By adjusting the viscosity to a specific range, the filler sags just enough to fill voids and conform to the OLED array contours, achieving maximum shock absorption with minimal volume. This parameter optimization ensures the filler height exceeds 1.2 times the OLED array height while minimizing overall assembly volume.
Solution Approach 2:
The filler is applied in excess of the minimum required amount to ensure complete coverage and proper distribution, but the excessive filler is controlled through viscosity management. This allows the filler to naturally sag and fill all necessary spaces, achieving adequate shock absorption capability without requiring additional volume in the final assembled product.
3Strength
If a silicon-based filler material is used, then mechanical strength is improved, but sealing requirements increase
Solution Approach 1:
The filler material's rheological parameters, particularly viscosity, are optimized to balance mechanical strength and sealing performance. The silicon-based filler is formulated with specific viscosity characteristics that allow it to provide structural support while maintaining adequate sealing properties, reducing the stringency of sealing requirements during assembly.
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 optimized filler distribution significantly increases the mechanical strength of the OLED display, effectively protecting it from external impacts and maintaining its structural integrity by ensuring the space between the substrates is adequately filled, thereby preventing air bubble formation and enhancing reliability.
Implementation Method 1
a filler placed in a space formed between the display substrate and the encapsulation substrate. The height of the filler is more than about 1.2 times that of the OLED array
Implementation Method 2
The filler may include a silicon-based material and the sealing member may be formed from a frit
Data Source
AI summary
An organic light emitting diode (OLED) display is disclosed. In one embodiment, the OLED display includes i) a display substrate, ii) an OLED array, iii) an encapsulation substrate arranged opposite to the display substrate with respect to the OLED array, iv) a sealing member configured to seal the display substrate and the encapsulation substrate and v) a filler applied in a space formed between the display substrate and the encapsulation substrate. In one embodiment, the height of the filler is more than about 1.2 times the height of the OLED array.