Spacer Layer Prevents Sealant Overflow in OLED Panels
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Solution Overview
Problem
In organic electroluminescence display (OELD) panels, excessive sealant can overflow and contaminate the organic functional layer due to uneven arrangement or pressure control during substrate joining, compromising luminescent properties and requiring large fillisters that may affect the panel's openness.
Innovation Solution
A spacer layer is formed in the non-display area surrounding the display area to prevent sealant overflow by positioning it between the sealant and the pixel array, ensuring the sealant does not contact the organic functional layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fillister is formed to hold overflowed sealant, then the sealant can be prevented from contacting the organic function layer, but the area of the fillister needs to be large which compromises the opening rate of the panel
Solution Approach 1:
A spacer layer is introduced as an intermediary barrier between the sealant and the organic function layer. This spacer layer, formed in the non-display area, actively prevents sealant overflow from reaching the display area, replacing the passive fillister approach and eliminating the need for large non-display areas.
2Reliability
If excessive sealant is used to ensure good sealing effect, then the sealing reliability is improved, but the sealant overflows and contacts the organic function layer compromising luminescent properties
Solution Approach 1:
The spacer layer is formed beforehand in the non-display area to create a protective barrier. This cushioning structure is prepared in advance to intercept and contain any potential sealant overflow, preventing it from reaching and damaging the organic function layer in the display area.
Solution Approach 2:
The spacer layer serves as a protective intermediary that decouples the sealing function from the display function. It allows excessive sealant to be contained in the non-display area while protecting the organic function layer from contamination, resolving the conflict between sealing reliability and luminescent properties.
3Quantity of substance
If the area of the fillister is increased to hold more overflowed sealant, then the sealant containment capacity is improved, but the opening rate of the panel is compromised
Solution Approach 1:
The solution transitions from a two-dimensional area-based fillister approach to a three-dimensional spacer layer approach. By utilizing the vertical dimension and forming a spacer layer with sufficient thickness, the sealant holding capacity is improved without increasing the horizontal area, thereby preserving the opening rate.
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 spacer layer effectively blocks overflowed sealant, preventing contamination of the organic functional layer and maintaining the panel's luminescent properties without increasing fabrication costs.
Implementation Method 1
the sealant 104 is solidified by ultraviolet radiation to seal the organic function layer 114 between the substrate 110 and the substrate 120
Implementation Method 2
an absorbent material block 106 is formed on the substrate 120 to absorb the penetrated vapors
Data Source
AI summary
A fabricating method of display panel is provided. A first substrate having display area and non-display area is provided. A pixel array and a spacer layer are respectively formed in the display area and non-display area by forming many first strip electrodes parallel to each other and on the substrate, by forming an organic function layer on the substrate and covering the first strip electrodes, and by forming many second strip electrodes parallel to each other and on the organic function layer. An extension direction of the first strip electrodes is different to that of the second strip electrodes. The spacer layer surrounds the display area. A sealant is formed in the non-display area, and the spacer layer is disposed between the sealant and the pixel array. A second substrate is arranged above the first substrate, and the first substrate and the second substrate are fixed by using the sealant.