Liquid Crystal Display Light Leakage Control via Refractive Index Matching
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Solution Overview
Problem
Current display devices suffer from low light utilization efficiency due to a large divergence angle of emitted light, with conventional peep-proof treatments further reducing efficiency, and existing technologies fail to effectively manage light leakage in dark states, impacting contrast performance.
Innovation Solution
A reflective display device with a liquid crystal layer, a light absorbing layer comprising a first and second shielding layer with a filling layer, and a reflector, where the liquid crystal layer modulates light under different voltages to direct refracted light for absorption, reducing light leakage and enhancing contrast by optimizing refractive indices and structural geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a peep-proof film is attached on the display screen to protect privacy, then privacy protection is improved, but light utilization efficiency deteriorates
Solution Approach 1:
The patent replaces the mechanical peep-proof film attachment with an integrated optical structure consisting of a liquid crystal layer, reflector, and light absorbing layer. This optical system provides privacy protection through directional light control rather than physical film barriers, thereby maintaining light utilization efficiency while achieving peep-proof functionality.
Solution Approach 2:
The display device integrates multiple functions into a single structure: the liquid crystal layer and reflector system simultaneously provides display functionality, directional light control for privacy protection, and light management. This eliminates the need for separate peep-proof films that would compromise light efficiency.
2Loss of energy
If the liquid crystal layer modulates light to direct it to the reflector for exit, then light utilization efficiency is improved, but light leakage in dark state increases
Solution Approach 1:
The patent divides the light management function into distinct segments: the liquid crystal layer for light modulation, the reflector for light redirection, and the light absorbing layer for light termination. This segmentation allows each component to perform its specific function efficiently, with the light absorbing layer specifically addressing light leakage in dark states by absorbing stray light that would otherwise leak.
3Object-generated harmful factors
If a light absorbing layer with multiple shielding layers is introduced, then light leakage control is improved, but device complexity increases
Solution Approach 1:
The patent merges the light absorbing function with the shielding layers into a single integrated light absorbing layer. This combination achieves effective light leakage control through the coordinated action of multiple shielding layers and filling layers without requiring separate, complex assemblies, thereby managing device complexity while maintaining effective light leakage 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 improves light transmission in dark states, enhances brightness-dark contrast, and increases light utilization efficiency while maintaining transparency, thereby improving the display's effectiveness and visual performance.
Implementation Method 1
the liquid crystal layer is configured to modulate light incident from the light entrance region into first refracted light under a first voltage, wherein the first refracted light is incident from the first opening into the filling layer and reflected between the first shielding layer and the second shielding layer, and modulate the light incident from the light entrance region into second refracted light under a second voltage different from the first voltage, wherein the second refracted light is directed to the reflector
Implementation Method 2
the second refracted light is directed to the reflector, reflected by the reflector and exits from the light outgoing region
Implementation Method 3
the filling layer has a refractive index equal to a first equivalent refractive index of the liquid crystal layer under the first voltage
Data Source
AI summary
The present disclosure provides a display device including a liquid crystal layer having a first surface and a second surface opposite to each other, and the second surface has a light entrance region and a light outgoing region; a reflector within the liquid crystal layer and adjacent the first surface; a light absorbing layer on the first surface of the liquid crystal layer, the light absorbing layer including a first shielding layer, a second shielding layer and a filling layer therebetween, the second shielding layer is between the first shielding layer and the liquid crystal layer and has a first opening therein, and the liquid crystal layer is configured to modulate light incident from the light entrance region into first refracted light under a first voltage; and modulate the light incident from the light entrance region into second refracted light under a second voltage different from the first voltage.