Reflective Display Refractive Index Control Without Partition Walls
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Solution Overview
Problem
Current reflective liquid crystal displays have complex structures and high production costs due to the need for partition walls to control the distribution of black particles, leading to uneven light distribution and potential light leaks.
Innovation Solution
A reflective display design featuring a first and second substrate with a transparent dielectric layer and liquid crystal, where the refractive index of the liquid crystal changes under an electric field to match or be less than the dielectric layer's, allowing for total reflection or transmission of light to achieve bright and black states without partition walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If partition walls are used to control black particle distribution, then light distribution control is improved, but device complexity and production cost increase
Solution Approach 1:
The patent removes the partition wall structure from the reflective display device. Instead of using physical partition walls to control black particle distribution, the invention relies on the refractive index difference between the liquid crystal and transparent dielectric layer to achieve light control, thereby simplifying the device structure while maintaining light distribution control capability
Solution Approach 2:
The patent changes the refractive index parameter of the liquid crystal by applying an electric field. When voltage is applied, the refractive index of the liquid crystal changes, enabling transition between light reflection and transmission states without requiring mechanical partition walls, thus reducing structural complexity
2Illumination intensity
If partition walls are used to control black particles, then light distribution is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and removes the partition wall component from the device structure. By using the optical properties of liquid crystal and refractive index differences instead of physical partitions, the manufacturing process is simplified and production costs are reduced while maintaining effective light distribution control
Solution Approach 2:
The patent replaces the mechanical partition wall structure with an optical field-based control mechanism. Electric fields are used to control liquid crystal orientation and refractive index, substituting mechanical structures with field-based control to reduce manufacturing complexity and cost
3Illumination intensity
If partition walls are used to control black particles, then light distribution is improved, but light leaks occur
Solution Approach 1:
The patent replaces mechanical partition walls with an optical field-based control system using liquid crystal and refractive index differences. This substitution eliminates the gaps and imperfections inherent in mechanical partition structures that cause light leaks, providing more reliable light control without harmful light leakage
Solution Approach 2:
The patent uses refractive index parameter changes in the liquid crystal to control light behavior. By adjusting the refractive index through electric field application, the system achieves uniform light distribution and prevents light leaks that occur with mechanical partition structures
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
This design simplifies the structure, reduces production costs, and eliminates light leaks by adjusting the refractive index of the liquid crystal to control light reflection and transmission, achieving stable bright and black states.
Implementation Method 1
a refractive index of the liquid crystal changes under action of an electric field formed by the first electrode and the second electrode
Implementation Method 2
the refractive index of the liquid crystal is less than the refractive index of the transparent dielectric layer, and in a case where an incident angle of light is larger than or equal to a minimum angle for the light which is subjected to total reflection between the liquid crystal and the transparent dielectric layer, the light is totally reflected at an interface of the transparent dielectric layer and the liquid crystal
Data Source
AI summary
A reflective display and a preparation method thereof are disclosed. The reflective display includes: a first substrate and a second substrate, a first electrode provided on the first substrate a transparent dielectric layer provided on a side of the first substrate, which side faces the second substrate, a second electrode provided on the second substrate, and liquid crystal located between the first substrate and the second substrate; a refractive index of the liquid crystal changes under action of an electric field formed by the first electrode and the second electrode so that the refractive index of the liquid crystal is the same as or substantially the same as a refractive index of the transparent dielectric layer, or less than the refractive index of the transparent dielectric layer.