Optical-Area Subpixel Shield Layout to Prevent Display Image Defects
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Solution Overview
Problem
Display devices with integrated optical electronic devices face challenges in maintaining display area size and image quality due to the need for increased bezels or notches to accommodate these devices, leading to potential damage of non-transmission area components during cathode patterning and transistor characteristic variations.
Innovation Solution
A display device and panel design incorporating a lower shield metal with openings to protect non-transmission area components and maintain high transmission performance, preventing component damage and abnormal images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lower shield metal is disposed under components in the non-transmission area to prevent damage, then component reliability is improved, but abnormal images are caused due to transistor characteristic variations
Solution Approach 1:
The lower shield metal is divided into multiple regions with different structures: a first region with an open structure (no metal) positioned over transistors to maintain electrical characteristics, and a second region with a closed structure positioned over other components to provide protection. This segmentation allows different functional requirements to be satisfied in different spatial locations.
Solution Approach 2:
Different structural configurations of the lower shield metal are applied to different locations based on local requirements: the open structure is used where transistor characteristic stability is critical, while the closed structure is used where component protection is prioritized. This local differentiation resolves the contradiction between protection and image quality.
2Illumination intensity
If the cathode electrode is removed from transmission areas to improve light transmission, then optical transmission performance is improved, but components in the non-transmission area are damaged by laser during cathode patterning
Solution Approach 1:
The lower shield metal is disposed in the non-transmission area before the cathode patterning process to provide preliminary protection against laser damage. This preventive measure allows the cathode electrode to be removed from transmission areas for improved light transmission while protecting underlying components from damage during the patterning process.
3Measurement precision
If an optical electronic device is located in the front portion to receive incident light, then light detection capability is improved, but bezel size or display area is reduced
Solution Approach 1:
The optical electronic device is relocated from the front surface (2D plane) to the back surface of the display panel, utilizing the third dimension (depth). This allows the device to receive incident light that passes through the display panel while maintaining the full front display area without notches or increased bezels.
Data Source
AI summary
A display device is disclosed. The display device comprises a display panel including an optical area and a normal area in a display area, and an optical electronic device overlapping at least a portion of the optical area. Two or more subpixels and a lower shield metal may be disposed in a non-transmission area between adjacent transmission areas in the optical area. In the non-transmission area of the optical area, the lower shield metal may include at least one opening overlapping all or a portion of a specific transistor among two or more transistors included in each of the two or more subpixels disposed in the non-transmission area in the optical area.