Cathode Layer Disconnect Structure for Low-Heat Display Patterning
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Solution Overview
Problem
The existing display apparatuses face challenges in implementing full-screen displays due to the space occupied by cameras and sensors, which can result in defects when irradiating laser beams, particularly due to uneven thermal energy distribution.
Innovation Solution
The display apparatus incorporates a structure with a light-emitting area and a light-transmitting area, where the cathode layer is physically disconnected using an under-cut structure, allowing for patterning with low thermal energy and preventing edge curling and heat conduction issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a laser beam is irradiated in the imaging area with camera and sensors, then the cathode layer can be patterned, but uneven thermal energy distribution causes defects and edge curling
Solution Approach 1:
The cathode layer is segmented into two distinct regions: a light-emitting area with continuous cathode layer and a light-transmitting area with patterned cathode layer. This segmentation allows different processing conditions and structures in different regions, enabling precise control of thermal energy distribution during laser irradiation while maintaining reliable device performance
Solution Approach 2:
The patent applies local quality by creating an under-cut structure specifically in the light-transmitting area where the cathode layer is patterned. This localized structural modification addresses the thermal energy concentration issue only where needed (in the imaging area with camera/sensors) without affecting the overall device structure, preventing edge curling and defects in the critical patterning region
2Manufacturing precision
If high thermal energy is used for cathode layer patterning, then patterning can be achieved, but it causes edge curling and damage to the light-emitting area
Solution Approach 1:
The under-cut structure is formed in advance before cathode layer deposition in the light-transmitting area. This preliminary action creates a physical discontinuity that prevents thermal energy from concentrating at the edges during subsequent laser patterning, thereby preventing edge curling and thermal damage before the patterning process occurs
Solution Approach 2:
The under-cut structure acts as an intermediary element between the laser beam and the cathode layer in the light-transmitting area. It mediates the thermal energy distribution by providing a physical structure that dissipates and redistributes heat, preventing direct concentration of thermal energy at the cathode layer edges and thus avoiding edge curling and damage
Data Source
AI summary
The present disclosure relates to a display apparatus. The display apparatus includes a plurality of light-transmitting areas disposed between the plurality of pixels. The light-transmitting area is formed between structures disposed in the light-emitting area adjacent to the light-transmitting area, and the structure physically disconnects a cathode layer of the light-emitting area and a cathode layer of the light-transmitting area. The cathode layer may be patterned in the light-transmitting area. Accordingly, when patterning is performed with a laser, it is possible to prevent the edge of the cathode layer from being curled in the outer portion of the light-transmitting area. In addition, it is possible to pattern with low energy and solve the damage due to thermal energy of the laser beam by preventing heat conduction to the light-emitting area of the light-emitting device layer. Further, it is possible to improve the reliability by blocking the moisture permeable path.