Protecting Layer Prevents Getter Contact in OLED Caps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In organic light-emitting devices, the getter layer can contact the cathode electrode due to external forces or weight, causing chemical reactions that damage the cathode and lead to short circuits, as existing protective measures are inadequate in preventing such contact.
Innovation Solution
A protecting layer is applied to the getter layer, made from materials like epoxy or polyimide, which prevents direct contact with the cathode electrode while maintaining moisture absorption functionality, ensuring the getter layer's effectiveness in absorbing moisture without damaging the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the cap is made thin to reduce weight and material cost, then the device complexity and cost are reduced, but the cap may deflect under external force or its own weight, causing the getter layer to contact the cathode electrode
Solution Approach 1:
A buffer layer is introduced between the getter layer and the cathode electrode to prevent direct contact. This intermediary layer absorbs the deflection of the thin cap under external force or self-weight, ensuring that the getter layer does not contact the cathode electrode even when the cap deflects significantly.
Solution Approach 2:
The buffer layer is pre-positioned between the getter layer and the cathode electrode to provide cushioning before any contact can occur. This preemptive protective measure ensures that even if the cap deflects under various conditions, the buffer layer will absorb the movement and prevent harmful contact.
2Area of stationary object
If the cap size is increased to enlarge the device, then the device area is increased, but the thin cap experiences greater deflection by its weight, increasing the risk of getter layer contact with the cathode electrode
Solution Approach 1:
The buffer layer serves as a mediator that decouples the deflection behavior of the large-area thin cap from the critical interface between the getter layer and cathode electrode. Even as the cap deflects more due to increased size and weight, the buffer layer maintains separation and prevents contact.
3Reliability
If the getter layer is used to absorb moisture in the inner space, then the moisture absorption function is improved, but the high chemical activity of the getter layer causes it to react with the cathode electrode when contact occurs, damaging the electrode
Solution Approach 1:
The buffer layer acts as a chemical barrier between the highly reactive getter layer and the cathode electrode. It allows the getter layer to maintain its high chemical activity for moisture absorption while preventing direct contact that would cause harmful chemical reactions with the metal cathode electrode.
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 protecting layer effectively prevents the getter layer from contacting the cathode electrode, reducing damage and short circuits, while maintaining the getter layer's moisture absorption function, thus ensuring stable device performance under external forces and weight.
Implementation Method 1
A protecting layer is applied to the getter layer, made from materials like epoxy or polyimide, which prevents direct contact with the cathode electrode
Implementation Method 2
The getter layer, composed of chemical materials, absorbs the moisture by chemical reactions with the moisture, whereby the moisture existing in the inner space between the cap and the substrate 1 is removed
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a display device preventing a getter layer from contacting elements disposed in the display device, and an embodiment of the present invention may be achieved in a whole or in part by a display device comprising: A substrate (100); A pixel part (100a) disposed on the substrate; A cap comprising a first region (12) attached on the substrate (100); and a second region (122) having a position different from a position of the first region, connected with the first region, and corresponding to the pixel part (100a); A getter layer (130) disposed on the second region of the cap; and A protecting layer (140) disposed on the getter layer (130).