TFT Substrate with Light-Absorbing Organic Layers
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Solution Overview
Problem
Display panels with micro LEDs face issues of visible spots on the screen due to internal reflection by light emitted from self-luminous devices and external light, caused by increased metal wirings required for high brightness and uniformity.
Innovation Solution
A thin film transistor (TFT) substrate design that includes multiple inorganic and organic insulating layers with black-based colors and carbon content, along with metal layers, where at least one organic insulating layer has a rough surface formed by plasma treatment, to absorb light and minimize reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If more metal wirings are increased to maintain uniformity without voltage drop at high brightness, then display uniformity and brightness are improved, but visible spots on screen due to light reflection increase
Solution Approach 1:
The patent converts the harmful reflective property of metal wirings into a beneficial light-absorbing structure by integrating the metal wiring within a black-colored organic insulating layer. The black layer absorbs the light that would otherwise be reflected by the metal wiring, thereby eliminating visible spots while preserving the electrical function of the metal wirings for maintaining display uniformity and brightness.
Solution Approach 2:
The black-colored organic insulating layer serves as an intermediary between the light-emitting micro LEDs and the metal wirings. This intermediate layer absorbs light before it can reach and reflect off the metal wirings, preventing the formation of visible spots while allowing the metal wirings to perform their electrical function.
2Reliability
If more metal wirings are added to the substrate, then voltage drop is reduced and display uniformity is improved, but the complexity of the substrate structure increases
Solution Approach 1:
The black-colored organic insulating layer performs multiple functions simultaneously: it provides electrical insulation between metal wiring layers, absorbs light to prevent visible spots, and structurally supports the metal wiring network. This multi-functionality allows the substrate to achieve display uniformity through extensive metal wiring without proportionally increasing structural complexity.
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
Effectively reduces visibility of spots on the screen by absorbing light emitted from micro LEDs and external light, preventing reflection and maintaining display quality.
Implementation Method 1
at least one of the second organic insulating layer and the third organic insulating layer is configured to absorb light
Implementation Method 2
The third organic insulating layer may have a rough surface formed by a plasma surface treatment
Data Source
AI summary
A thin film transistor substrate and a display module comprising same are provided. The disclosed thin film transistor (TFT) substrate includes: a substrate; first and second inorganic insulating layers which are successively laminated on the substrate; a first metal layer which is formed between the first and second inorganic insulating layers; a second metal layer which is formed on the second inorganic insulating layer; first, second, and third organic insulating layers which are successively laminated on the second inorganic insulating layer; a third metal layer which is formed between the first and second organic insulating layers; and a fourth metal layer which is formed between the second and third organic insulating layers, wherein at least one of the second and third organic insulating layers is configured to absorb light..