Pixel Structure Light Shielding Layer for Ambient Contrast
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Solution Overview
Problem
Display panels face a drop in ambient contrast ratio due to reflective metal layers in signal lines and active components, which reflect ambient light.
Innovation Solution
A pixel structure is designed with a thin film transistor and conductive layers, where a light shielding layer made of photoresist and light-absorbing particles is applied on the top surface and sidewalls of the conductive layers to reduce ambient light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal layers are used for signal lines and active components to ensure good conductivity, then electrical conductivity is improved, but ambient light reflection increases causing drop in ambient contrast ratio
Solution Approach 1:
The patent applies a composite light shielding layer comprising a photoresist matrix and dispersed light-absorbing particles (such as carbon black, titanium oxide, or titanium nitride). This composite structure combines the protective and adhesive properties of the photoresist with the light-absorbing characteristics of the particles, effectively reducing ambient light reflection from the metal conductive layers while preserving electrical conductivity.
Solution Approach 2:
The invention converts the harmful reflective property of metal layers into a beneficial configuration by coating them with a light shielding layer. The metal layers continue to provide excellent electrical conductivity, while the added photoresist-particle composite layer absorbs ambient light, transforming the potential harm (reflection) into a benefit (reduced reflection, improved contrast ratio).
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 implementation of the light shielding layer enhances the optical performance of display panels by increasing the ambient contrast ratio.
Implementation Method 1
The first light shielding layer includes a first photoresist and first particles mixed within the first photoresist. The first particles are light absorbing particles.
Data Source
AI summary
A pixel structure includes a substrate, a thin film transistor disposed on the substrate and having a first end, a second end and a control end, a first signal line electrically connected to the first end of the thin film transistor, a second signal line electrically connected to the control end of the thin film transistor, a pixel electrode electrically connected to the second end of the thin film transistor, and a light shielding layer. At least one of the first end of the thin film transistor, the second end of the thin film transistor, the control end of the thin film transistor, the first signal line and the second signal line is formed of a conductive layer. The light shielding layer is disposed on a top surface and a sidewall of the conductive layer. The light shielding layer includes a photoresist and particles mixed within the photoresist.