Uneven Photosensitive Layer for Light Absorption in TFT Substrates
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Solution Overview
Problem
The existing photoelectric conversion substrates suffer from low absorption efficiency due to light scattering, which adversely affects the detection accuracy of optical sensors, particularly when converting visible light into electric signals.
Innovation Solution
A photoelectric conversion substrate with a thin film transistor (TFT) and a photosensitive element featuring a light-transmissible electrode, a signal output electrode, and an uneven photosensitive layer, where the insulation layer has a textured surface to increase the photosensitive area and absorption efficiency, allowing more light to be incident on the photosensitive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat photosensitive layer is used, then the manufacturing process is simple, but the light absorption efficiency is low due to light scattering
Solution Approach 1:
The photosensitive layer is designed with an uneven surface featuring protrusions and concavities instead of a flat surface. This curved topology increases the optical path length of incident light within the photosensitive layer, enhancing light absorption efficiency and generating more photoelectrons without complicating the manufacturing process
Solution Approach 2:
The invention transitions from a two-dimensional flat photosensitive layer to a three-dimensional uneven surface structure. By adding vertical dimension variations through protrusions and concavities, the effective light absorption area is increased, improving detection accuracy while maintaining manufacturing simplicity
2Measurement precision
If the photosensitive area is increased to improve light absorption, then the detection accuracy improves, but the device area increases
Solution Approach 1:
By creating an uneven surface with protrusions and concavities within the same planar footprint, the effective light absorption area is increased without expanding the overall device area. The vertical dimension variations allow more light to be absorbed within the same footprint, improving detection accuracy while maintaining compact device dimensions
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
The uneven photosensitive layer enhances the photosensitivity and detection accuracy of the substrate by increasing the area for light absorption, improving the conversion of light into electric signals.
Implementation Method 1
When visible light is converted into an electric signal by the photodiode
Implementation Method 2
the photosensitive layer is an uneven layer... increasing the area for light absorption, improving the conversion of light into electric signals
Data Source
AI summary
A photoelectric conversion substrate, a method for manufacturing the photoelectric conversion substrate, a display panel and a display device are provided. The photoelectric conversion substrate includes a TFT and a photosensitive element on a base substrate, wherein the photosensitive element includes a light-transmissible electrode, a signal output electrode, and a photosensitive layer between the light-transmissible electrode and the signal output electrode. The light-transmissible electrode allows predetermined light rays to pass therethrough and to be incident onto the photosensitive layer, and the signal output electrode is connected to the TFT, and the photosensitive layer is an uneven layer.