Display Module Planarization Layout to Reduce Color Separation
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Solution Overview
Problem
The insufficient planarization of the anode metal layer substrate in display modules leads to color separation and reduced display effect due to the formation of long slope planes between etched lapping holes, affecting the effective active area.
Innovation Solution
A display module with an auxiliary member, such as a cushion or fixing member, is introduced to adjust the ratio of parallel and inclined areas at the lapping hole, increasing the effective active area by reducing height differences and slope angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lapping holes are etched on the planarization layer to connect the anode metal layer and source-drain metal layer, then electrical connection is achieved, but a long slope plane is formed between the lapping hole and the planarization layer plane, reducing the effective active area and causing color separation
Solution Approach 1:
The patent applies preliminary action by forming a filling layer in the lapping hole before establishing the electrical connection. This filling layer is formed in advance to prevent the formation of long slope planes on the planarization layer surface, thereby maintaining the effective active area while still achieving the electrical connection between the anode metal layer and source-drain metal layer through the lapping hole.
2Reliability
If lapping holes are etched to realize overlap between anode metal layer and source-drain metal layer, then electrical connection is enabled, but the slope plane formed reduces effective active area leading to serious color separation
Solution Approach 1:
The filling layer is formed preliminarily in the lapping hole before subsequent processing steps. This preliminary formation of the filling layer prevents the planarization layer from forming long slope planes, thereby maintaining high planarization quality and preventing color separation while still enabling the electrical connection through the lapping hole.
3Reliability
If the planarization layer is etched to create lapping holes for metal layer connection, then electrical connectivity is achieved, but the resulting slope planes reduce display effect due to color separation
Solution Approach 1:
The filling layer is formed in advance in the lapping hole to prevent the formation of slope planes that would cause color separation. This preliminary action maintains the display effect while still achieving the necessary electrical connectivity between the metal layers through the lapping hole structure.
Data Source
AI summary
The first source-drain metal layer included in the display module is located in a lapping area of the planarization layer, and the anode metal layer is stacked on the planarization layer. The first source-drain metal layer and the anode metal layer are electrically connected to each other through a lapping hole disposed in the lapping area. A first surface of the planarization layer includes a first area and a second area, wherein the first area is an area where the first surface of the planarization layer is parallel to a plane where the anode metal layer is located, the second area is an area where a first surface of the planarization layer intersects with the plane where the anode metal layer is located, and the first surface of the planarization layer is a surface opposite to the anode metal layer.