Bent Connection Portion for Overlapping Light Sensor in Display
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Solution Overview
Problem
Display devices with integrated light sensors face a coupling phenomenon between the pixel and sensor units, which affects performance and requires additional space, making it challenging to optimize their arrangement for efficient light sensing and display.
Innovation Solution
A display device design featuring a substrate with a display portion, a light sensing portion, and a connection portion where the light sensing portion overlaps the display portion by bending the connection portion, utilizing transistors with different channel materials for enhanced light sensitivity and a driving integrated circuit to apply signals to both pixel and light sensor transistors, ensuring the light sensor transistor does not overlap the reflective pixel electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light sensor is disposed along the front surface of the display device away from the active display portion, then the light sensor can be accommodated with additional space, but the device occupies more area and reduces display space
Solution Approach 1:
The light sensing portion is nested within the display portion by bending the connection portion, allowing the light sensor to be positioned within the projection area of the display device without occupying additional front surface space. This nesting arrangement enables both components to coexist within the same footprint.
Solution Approach 2:
The connection portion is bent to create a three-dimensional arrangement where the light sensing portion is positioned at a different depth level than the display portion. This dimensional change allows the light sensor to be accommodated within the display device's projection area while maintaining functional separation.
2Area of stationary object
If the light sensor is arranged in a display pixel to save space, then the device area is reduced, but a coupling phenomenon occurs between the display pixel and the light sensor
Solution Approach 1:
The display device is segmented into distinct functional portions: a display portion containing pixel transistors and an organic light emitting element, and a light sensing portion containing light sensor transistors. The connection portion with different channel material provides electrical separation, preventing coupling between the display and sensing functions while maintaining compact integration.
Solution Approach 2:
The connection portion uses a channel layer with different material properties (higher light sensitivity) compared to the pixel transistor channel layer. This local quality difference enables the connection portion to function as both an electrical conduit and a light-sensitive region, while the reflective pixel electrode is positioned to avoid overlapping with the light sensor transistor, preventing unwanted coupling.
3Area of stationary object
If the connection portion is bent to overlap the light sensing portion with the display portion, then space is optimized, but the structural complexity increases
Solution Approach 1:
The connection portion is bent into a curved configuration rather than remaining flat, creating a three-dimensional arrangement where the light sensing portion overlaps the display portion. This curvature enables space optimization by positioning components vertically rather than horizontally, reducing the overall device footprint.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively prevents coupling between the pixel and sensor units, optimizing space usage and improving light sensing capabilities while maintaining display performance, thereby enhancing the overall efficiency and functionality of the display device.
Implementation Method 1
The second material included in the channel layer of the light sensor transistor may be more sensitive to light than the first material included in the channel layer of the pixel transistor
Data Source
AI summary
An exemplary embodiment of the present invention is related to a display device, the display device including: a substrate which includes a display portion, a light sensing portion, and a connection portion located between the display portion and the light sensing portion, in which the connection portion is bent such that the light sensing portion overlaps the display portion by bending of the connection portion.