Polarizer-Free Display Panel Using Liquid Crystal Refractive Index Control
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Solution Overview
Problem
Existing liquid crystal display devices face issues with low transmittance and slow response time due to the use of polarizers, which also prevent the application of quantum dot materials that can destroy polarization states.
Innovation Solution
A display panel design that includes a liquid crystal layer, a waveguide layer, a grating layer, and a quantum dot color filter layer, where electrodes adjust the refractive index of the liquid crystal layer to control light coupling efficiency, eliminating the need for polarizers and allowing for the use of quantum dot materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dot material is used as color resists, then color gamut is improved, but polarization state is destroyed
Solution Approach 1:
The patent removes the polarizer from the display panel structure, extracting the problematic component that conflicts with quantum dot material. By eliminating the polarizer, the system can utilize quantum dot color resists without suffering from polarization destruction, thereby achieving high color gamut while maintaining compatibility with quantum dot technology.
2Ease of operation
If polarizer is used in display panel, then grayscale display is achieved, but transmittance is reduced
Solution Approach 1:
The patent eliminates the polarizer component from the display panel, removing the source of light loss. Instead of relying on polarizers for grayscale control, the invention uses a combination of liquid crystal layer with variable refractive index and grating structure that can modulate light without requiring polarizing filters, thereby significantly improving transmittance.
Solution Approach 2:
The liquid crystal layer serves multiple functions: it controls light propagation direction through refractive index changes, works in conjunction with the grating structure for light modulation, and enables grayscale display without requiring separate polarizing components. This multi-functional approach replaces the traditional polarizer-dependent grayscale mechanism.
3Ease of operation
If polarizer is used in display panel, then grayscale display is achieved, but liquid crystal cell thickness is increased
Solution Approach 1:
By removing the polarizer from the system, the patent eliminates the need for thick liquid crystal layers that would otherwise be required to achieve sufficient phase retardation for polarizer-based grayscale control. The thinner liquid crystal cell can now work effectively with the grating-assisted light modulation mechanism.
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 improves transmittance and response time by enabling the use of quantum dot materials, achieving high color gamut and pure colors without the need for polarizers, suitable for transparent display products.
Implementation Method 1
the first electrode and the second electrode are configured to adjust a refractive index of the liquid crystal layer by changing voltages applied thereto
Implementation Method 2
a coupling efficiency at which light is coupled out of the waveguide layer is determined according to a difference between the refractive index of the liquid crystal layer and a refractive index of the grating layer
Data Source
AI summary
A display panel and a display device are disclosed. The display panel includes a first substrate, a liquid crystal layer, a waveguide layer, a grating layer, a quantum dot color filter layer, a first electrode and a second electrode, wherein the first electrode and the second electrode are configured to adjust a refractive index of the liquid crystal layer by changing voltages applied thereto; wherein a coupling efficiency at which light is coupled out of the waveguide layer is determined according to a difference between the refractive index of the liquid crystal layer and a refractive index of the grating layer.