Patterned Common Electrode for Display Light Transmittance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices face challenges in enhancing light transmittance in areas beyond image display, such as for optical members like cameras or sensors, without compromising image quality or increasing complexity.
Innovation Solution
A display device design featuring a substrate with a first display area for image display and a second display area with higher light transmittance, incorporating a common electrode with patterned regions that are thinner or absent in specific areas, allowing for increased light transmission while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a common electrode with uniform thickness is used across the entire display area, then the image display quality is maintained, but the light transmittance in non-image areas is reduced
Solution Approach 1:
The common electrode is designed with different thicknesses in different regions: a first thickness in the first display area for image display and a second thickness (greater than the first) in the second display area for enhanced light transmittance. This local differentiation allows each region to have the optimal electrode thickness for its specific function.
Solution Approach 2:
The common electrode is segmented into multiple regions with different thickness characteristics. The electrode includes a first region corresponding to the first display area and a second region corresponding to the second display area, where the second region has enhanced light transmittance properties through reduced material deposition or selective removal.
2Measurement precision
If the common electrode thickness is increased to improve light transmittance, then optical member recognition is enhanced, but the image display quality deteriorates
Solution Approach 1:
Different electrode thicknesses are applied locally to different functional areas: the first display area maintains a standard thickness for optimal image display quality, while the second display area uses a thinner electrode configuration to maximize light transmittance for optical member recognition and sensing.
Solution Approach 2:
The common electrode is divided into functionally distinct segments: a first region for image display with standard thickness and a second region for optical interaction with enhanced light transmittance. This segmentation allows independent optimization of each region's electrical and optical properties.
3Ease of manufacture
If a uniform common electrode structure is used across both display areas, then manufacturing is simplified, but light transmittance in the second display area is insufficient
Solution Approach 1:
The electrode fabrication process incorporates local quality variations by controlling deposition thickness or performing selective removal in the second display area. This allows the majority of the electrode structure to be manufactured uniformly while applying local modifications to achieve enhanced light transmittance where needed.
Solution Approach 2:
The manufacturing process is segmented into common fabrication steps for the entire electrode and subsequent selective processing steps for the second display area. This approach maintains manufacturing simplicity for the bulk structure while enabling localized optimization for light transmittance enhancement.
Data Source
AI summary
A display device includes a substrate including a first display area and a second display area. The first display area includes first pixel areas, each including one or more first pixels. The second display area includes second pixel areas including one or more second pixels and a light transmittance area having a higher light transmittance than the second pixel area. The first and second display areas include a common electrode that transmits a constant common voltage. The common electrode in the second display area includes patterned regions that correspond to a first light transmittance area included in the light transmittance area. A thickness of the common electrode in the patterned regions is smaller than a thickness of the common electrode in a region other than the patterned regions or equals zero. The patterned regions and the second pixel areas extend alternately along a first direction in the second display area.