Integrated OPD Transistor Substrate With On-Board Light Source
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Solution Overview
Problem
Existing sensor devices using organic photo detectors (OPDs) often require separate substrates for the sensor element and light source, leading to increased complexity and cost.
Innovation Solution
A transistor substrate is designed to integrate a light source and a sensor element, including a pixel electrode, switching element, common electrode, and organic photo detector layer, all mounted on the same substrate, with the organic photo detector layer serving as a planarization film for the light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate substrates are used for sensor element and light source, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the sensor element and light source onto a single substrate, eliminating the need for separate substrates. The organic photo detector layer serves dual purposes as both the sensing element and the planarization film for the light source, achieving functional integration that reduces device complexity while maintaining reliability through careful optical isolation design.
Solution Approach 2:
The organic photo detector layer performs multiple functions: it acts as the sensor element for detecting light, serves as a planarization film to provide a flat surface for light source mounting, and functions as an optical isolation layer to prevent direct light incidence on the sensor. This multi-functionality reduces the number of separate components and substrates needed.
2Manufacturing precision
If separate substrates are used for sensor element and light source, then manufacturing precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
By combining the sensor element and light source on a single substrate, the patent eliminates the complex alignment and bonding processes required for separate substrates. The organic photo detector layer is formed in-situ as part of the sensor element fabrication, and simultaneously serves as the planarization film, simplifying the manufacturing process while maintaining precision through integrated formation.
3Device complexity
If light source is integrated with sensor element, then device complexity is reduced, but harmful factors increase
Solution Approach 1:
The organic photo detector layer acts as an intermediary element between the light source and the sensor element. It provides optical isolation by absorbing or blocking direct light paths while allowing the integrated structure to remain compact. This mediator layer prevents harmful direct light incidence on the sensor while maintaining the benefits of integration.
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 integrated approach reduces the cost of the sensor device by achieving commonality of electrodes and reducing the need for separate substrates, while ensuring effective light management to prevent direct light incidence on the sensor element.
Implementation Method 1
The sensor element includes a pixel electrode, a switching element, a common electrode and an organic photo detector layer
Implementation Method 2
the organic photo detector layer being provided in a same layer as the light source
Data Source
AI summary
According to one embodiment, a transistor substrate includes a substrate, a light source and a sensor element. The light source is mounted on the substrate. The sensor element is mounted on the substrate. The sensor element includes a pixel electrode, a switching element, a common electrode and an organic photo detector layer. The switching element is electrically connected to the pixel electrode. The common electrode is opposed to the pixel electrode. The organic photo detector layer is provided between the pixel electrode and the common electrode. The light source is provided in a same layer as the organic photo detector layer.