Reflective Nano-Grating Light-Shielding Layer Display Efficiency
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Solution Overview
Problem
Liquid crystal display devices suffer from significant light energy loss due to absorption by the light-shielding layer, resulting in a substantial reduction in display efficiency.
Innovation Solution
A reflective nano-grating is integrated onto the light-shielding layer near the backlight module, reflecting polarized light back to the module where it is depolarized and recycled, thereby reducing absorption and enhancing light energy utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-shielding layer is disposed around sub-pixels to block light, then display contrast and image quality are improved, but light energy loss increases significantly due to absorption by the light-shielding layer
Solution Approach 1:
The patent converts the harmful light absorption by the light-shielding layer into a beneficial reflection mechanism. By introducing a reflective nano-grating with subwavelength structure on the light-shielding layer, the previously absorbed light energy is now reflected back through the liquid crystal layer, allowing for potential reuse and significantly reducing light energy loss while maintaining the light-shielding function.
Solution Approach 2:
The patent changes the optical parameters of the light-shielding layer by introducing a reflective nano-grating with specific subwavelength structure. This nano-grating structure alters the light interaction from absorption to reflection, with the grating period, duty ratio, and height carefully controlled to achieve wavelength-selective reflection while maintaining the light-shielding function.
2Loss of energy
If a reflective nano-grating is added to the light-shielding layer to reflect light back, then light energy utility is improved, but device complexity increases
Solution Approach 1:
The patent merges the light-shielding function and the light-reflection function into a single integrated structure. The reflective nano-grating is formed directly on the light-shielding layer, combining two previously separate functions (light blocking and light reflecting) into one component, thereby improving light energy utility without proportionally increasing device complexity.
Solution Approach 2:
The patent uses a thin-film nano-grating structure with subwavelength dimensions that can be integrated into the existing display panel architecture. This thin-film approach allows the reflective function to be added without significantly increasing the overall device thickness or structural complexity, as the nano-grating is formed as a thin layer on the existing light-shielding layer.
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 reflective nano-grating effectively recycles polarized light that would otherwise be absorbed, improving the light energy utility and efficiency of the display device by minimizing light loss.
Implementation Method 1
a reflective nano-grating is disposed on one side of the light-shielding layer near the backlight module; an included angle between a grating direction of the reflective nano-grating and a polarized direction of a polarized light emitted toward the reflective nano-grating is less than 90 degrees, so that at least one part of the polarized light emitted toward the reflective nano-grating is reflected back to the backlight module
Implementation Method 2
the reflected polarized light is depolarized by the backlight module to be recycled
Data Source
AI summary
A display device is provided. The display device includes a display panel and a backlight module. The display panel includes sub-pixels and a light-shielding layer disposed around the sub-pixels. A reflective nano-grating is disposed on one side of the light-shielding layer near the backlight module. The backlight module provides a backlight source for the display panel, and the backlight source is converted into a polarized light in the display panel. The reflective nano-grating is used to reflect at least one part of the polarized light emitted toward the reflective nano-grating back to the backlight module for recycling.