Multilayer Dielectric Light-Shielding Structure for LCDs
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Solution Overview
Problem
Conventional light-shielding structures in LCDs face issues such as photo-induced leakage current and image sticking due to light reflection, and poor adhesion in resin-based structures, leading to suboptimal display performance.
Innovation Solution
A light-shielding structure comprising multiple dielectric layers and a metal layer, with specific refractive indices and thicknesses, is used to reduce light reflection and enhance adhesion, replacing conventional structures to cover non-display regions and minimize current leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding layer made of metal is applied to products with high brightness, then the light-shielding effect is improved, but light reflection to active devices increases causing photo-induced leakage current
Solution Approach 1:
The patent employs a composite light-shielding structure consisting of multiple dielectric layers with different refractive indices stacked alternately. This composite structure achieves effective light shielding while minimizing light reflection to active devices, thereby preventing photo-induced leakage current without sacrificing shielding performance
Solution Approach 2:
The patent utilizes the refractive index parameter of dielectric materials to design the light-shielding structure. By selecting dielectric layers with specific refractive indices (different from each other) and controlling their thicknesses, the structure achieves optimal light shielding while reducing harmful light reflection to active devices
2Reliability
If a light-shielding structure made of resin is used, then light reflection to active devices is reduced, but adhesion to the base of the color filter substrate becomes unfavorable
Solution Approach 1:
The patent uses a composite structure of multiple dielectric layers that provides both favorable adhesion to the color filter substrate base and effective control of light reflection. The dielectric materials offer better adhesion properties compared to resin while maintaining the light reflection control capability
Solution Approach 2:
The patent applies different dielectric materials with specific properties to different layers of the light-shielding structure. Each layer has tailored local characteristics (refractive index, thickness) to achieve both strong adhesion to the substrate and optimal light reflection control
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 solution effectively reduces light reflection back to active devices, preventing current leakage and image sticking, while ensuring strong adhesion, thus improving display quality and reliability.
Implementation Method 1
The light-shielding structure has a first dielectric layer, a second dielectric layer, a third dielectric layer, a metal layer, a fourth dielectric layer, a fifth dielectric layer, and a sixth dielectric layer stacked sequentially... A thickness of the first dielectric layer, a thickness of the second dielectric layer, and a thickness of the third dielectric layer are different from one other. A thickness of the fourth dielectric layer, a thickness of the fifth dielectric layer, and a thickness of the sixth dielectric layer are different from one other.
Implementation Method 2
the light-shielding layer may reflect light emitted by the backlight source to active devices of the active device array substrate
Data Source
AI summary
A display apparatus includes an active device array substrate, an opposite substrate disposed opposite to the active device array substrate, and a display medium disposed between the active device array substrate and the opposite substrate. The opposite substrate includes a first base and a light-shielding structure disposed on the first base and located between the first base and the active device array substrate. The light-shielding structure has a first dielectric layer, a second dielectric layer, a third dielectric layer, a metal layer, a fourth dielectric layer, a fifth dielectric layer, and a sixth dielectric layer stacked sequentially in a direction from the first base to the active device array substrate. The first, second, and third dielectric layers have different thicknesses. The fourth, fifth, and sixth dielectric layers have different thicknesses.