Display Circuit Layout for On-Screen Optical Sensor Integration
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Solution Overview
Problem
Existing display devices face challenges in integrating optical sensors efficiently on the display surface while maintaining optimal performance and functionality of both display and sensor elements.
Innovation Solution
A display device design that includes a circuit element layer with vertical and horizontal connection lines for direct current signals, arranged in a mesh shape on different layers, and an insulating layer covering these lines, allowing for efficient integration of optical sensors on the display surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical sensors are integrated on the display surface, then the functionality and performance of the display device is improved, but the complexity of the circuit element layer increases due to additional connection lines
Solution Approach 1:
The patent introduces vertical connection lines that extend in the second direction (vertical dimension) to connect the read-out line and data line, transforming a two-dimensional planar connection into a three-dimensional structure. This allows signals to be transmitted between layers without increasing the horizontal footprint, thereby integrating optical sensors on the display surface while managing circuit complexity through spatial dimensionality.
Solution Approach 2:
The circuit element layer is segmented into multiple functional components: pixel driving circuits, sensor driving circuits, read-out lines, data lines, and vertical connection lines. Each component is independently configured and connected through the vertical connection lines, allowing for modular integration of optical sensors without overwhelming the overall circuit design.
2Reliability
If vertical connection lines are added to connect sensor circuits, then signal transmission is improved, but the area occupied by connection lines increases
Solution Approach 1:
The vertical connection lines utilize the vertical dimension (second direction) to connect circuit elements, rather than expanding horizontally. This allows signal transmission between the read-out line and data line while occupying minimal planar area, as the connections proceed vertically through the circuit element layer rather than laterally across the display surface.
3Adaptability or versatility
If multiple connection lines are arranged in a mesh shape, then the integration of optical sensors is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The mesh-shaped connection structure is segmented into vertical connection lines and horizontal data/read-out lines that can be manufactured in separate steps. The vertical connection lines are configured to connect specific segments of the horizontal lines at defined intersection points, allowing for staged manufacturing processes that reduce the overall precision requirements compared to creating the entire mesh structure in a single step.
4Object-generated harmful factors
If an insulating layer covers the connection lines, then interference between signals is reduced, but the overall device thickness increases
Solution Approach 1:
The insulating layer acts as an intermediary substance placed between the vertical connection line and the data line to prevent direct electrical contact and signal interference. This thin dielectric layer provides electrical isolation while occupying minimal space in the vertical dimension, thereby reducing signal interference without significantly increasing the overall device thickness.
Data Source
AI summary
A display device includes a base layer, a circuit element layer, and a display element layer including a light emitting element and a light receiving element, wherein the circuit element layer includes pixel driving circuits connected to the light emitting element, sensor driving circuits connected to the light receiving element, a read-out line connected to the sensor driving circuits and extending in a first direction, a first data line connected to the pixel driving circuits and extending in the first direction, a first vertical connection line which is between the first data line and the read-out line in a second direction and extends in the first direction and to which a first DC signal is transmitted, and an insulating layer that covers the first vertical connection line and the first data line, and the first DC signal is a signal transmitted to the pixel driving circuits.