Electrode Structure with Dielectric Slit for Reflective LCD Light Diffraction
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Solution Overview
Problem
Reflective liquid crystal display devices face challenges in improving light utilization efficiency due to the space between pixel electrodes, which reduces reflectance and affects image quality.
Innovation Solution
An electrode structure with a plurality of pixel electrodes and dielectric layers, where a second dielectric layer with a higher refractive index than the first dielectric layer has a slit positioned between adjacent pixel electrodes, enhancing light diffraction and reducing light loss in the space between electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pixel electrodes are arranged separately to enable independent liquid crystal control, then liquid crystal control capability is improved, but light reflection efficiency deteriorates due to space between electrodes
Solution Approach 1:
The invention converts the harmful effect of light leakage into a beneficial diffraction grating. The spaces between pixel electrodes, which originally caused light loss, are utilized as diffraction elements. By forming dielectric layers with different refractive indices in these spaces, the structure diffracts incident light back toward the pixel electrodes, transforming the harmful light leakage into useful light reflection that enhances overall reflectance.
Solution Approach 2:
The invention changes the optical parameters of the space between pixel electrodes by introducing dielectric layers with specific refractive indices. The first dielectric layer has a refractive index of 1.45 or less, while the second dielectric layer has a refractive index greater than 1.45. This parameter change creates optical contrast that enables diffraction of light at the interfaces, improving light utilization without affecting pixel electrode arrangement.
2Loss of energy
If a light shielding film is provided in the space between pixel electrodes to prevent light leakage, then light reflection efficiency is improved, but device complexity increases
Solution Approach 1:
The invention replaces the mechanical light shielding film with an optical diffraction mechanism. Instead of using a physical barrier to block light, the patent uses dielectric layers with different refractive indices to diffract light back toward the pixel electrodes. This substitution eliminates the need for additional light shielding structures, reducing device complexity while maintaining or improving light reflection efficiency.
Solution Approach 2:
The dielectric layers serve multiple functions: they provide electrical insulation between pixel electrodes and simultaneously act as a diffraction grating to control light propagation. This multi-functionality eliminates the need for separate light shielding films, as the same structures that are necessary for electrical isolation also perform the light control function.
3Loss of energy
If dielectric layers with different refractive indices are laminated to create diffraction, then light utilization efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The invention segments the dielectric structure into two distinct layers with different refractive indices: a first dielectric layer with refractive index ≤1.45 and a second dielectric layer with refractive index >1.45. This segmentation creates the necessary optical contrast for diffraction while allowing each layer to be formed using standard semiconductor manufacturing techniques, making the complex optical function achievable through conventional processes.
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 electrode structure improves light utilization efficiency by diffraction, increasing reflectance and enhancing image quality by minimizing light loss between pixel electrodes.
Implementation Method 1
When being incident on the first dielectric layer, the light that has passed through the slit of the second dielectric layer comes around to the back side of the second dielectric layer as viewed from a light incident direction. That is, the light that has passed through the slit of the second dielectric layer is diffracted at the boundary with the first dielectric layer.
Data Source
AI summary
An electrode structure includes: a plurality of pixel electrodes arranged separately from each other; and a plurality of dielectric layers laminated in a first direction with respect to the plurality of pixel electrodes, in which the plurality of dielectric layers includes: a first dielectric layer that spreads over the plurality of pixel electrodes in a direction intersecting with the first direction; and a second dielectric layer that includes dielectric material having a refractive index higher than that of the first dielectric layer, sandwiches the first dielectric layer together with the plurality of pixel electrodes, and has a slit at a position overlapping space between pixel electrodes adjacent when viewed from the first direction.