TFT Substrate Light Shielding Layer for Display Stability
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Solution Overview
Problem
DB cell display devices experience display abnormalities due to light reflection from the wire-grid polarizer affecting the electrical characteristics of the TFT substrate, leading to changes in the TFT's electrical properties.
Innovation Solution
A TFT substrate with a light shielding layer made of organic material, positioned to cover the source drain, active, and gate layers, preventing light reflection and ensuring effective shielding without reducing light transmittance, and including a via hole with a specific distance from the light shielding layer to avoid interference with subsequent processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light shielding layer is added to prevent light reflection affecting TFT electrical characteristics, then display performance stability is improved, but device structure complexity increases
Solution Approach 1:
A light shielding layer is introduced as an intermediary component between the wire-grid polarizer and the TFT substrate. This layer mediates the interaction by absorbing or blocking reflected light before it reaches the TFT, thereby preventing light-induced electrical characteristic changes while maintaining the overall display structure
Solution Approach 2:
The light shielding layer is positioned specifically above the gate layer and active layer of the TFT, providing localized shielding only where needed. This targeted approach prevents light reflection effects on the TFT electrical characteristics without requiring complete coverage of the entire display structure, thus balancing protection effectiveness with structural simplicity
2Object-affected harmful factors
If the light shielding layer completely covers the TFT including gate layer, then shielding effectiveness is improved, but light transmittance of the display decreases
Solution Approach 1:
The light shielding layer is positioned specifically above the gate layer and active layer of the TFT, providing localized shielding only where needed. This targeted approach prevents light reflection effects on the TFT electrical characteristics without requiring complete coverage of the entire display structure, thus balancing protection effectiveness with structural simplicity
Solution Approach 2:
The light shielding layer provides partial coverage rather than complete coverage of the TFT structure. By shielding only the critical gate layer and active layer areas, the solution achieves sufficient protection against light-induced electrical changes while allowing light to pass through other areas, thereby maintaining adequate light transmittance for display functionality
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 light shielding layer effectively prevents light-induced changes in the TFT's electrical characteristics, maintaining normal display performance even under illumination, and enhances the top-light characteristics of the TFT substrate.
Implementation Method 1
a light shielding layer on a side of the source drain layer of the TFT distal to the base substrate, and an orthographic projection of the light shielding layer on the base substrate completely covers an orthographic projection of the active layer of the TFT on the base substrate
Data Source
AI summary
The present disclosure provides a thin film transistor (TFT) substrate and a display device, the TFT substrate includes an base substrate and a plurality of pixel units, wherein each of the pixel units includes a TFT on the base substrate, the TFT includes a source drain layer, an active layer, and a gate layer; the TFT substrate further includes a light shielding layer on a side of the source drain layer of the TFT distal to the base substrate, and an orthographic projection of the light shielding layer on the base substrate completely covers an orthographic projection of the active layer of the TFT on the base substrate, and partially covers an orthographic projection of the gate layer of the TFT on the base substrate.