Display Panel Light Extraction Structures for Positive Viewing Angle
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels fail to emit light from a positive viewing angle, limiting the visibility of displayed content and resulting in low display contrast due to the absence of light emission in this direction.
Innovation Solution
A display panel design featuring a light guide plate, a liquid crystal layer, and specific light extraction structures, including a light taking grating, first and second wire grid structures, and electrode structures, which allow light to be emitted at various angles by deflecting liquid crystal molecules to form a diffraction grating, enabling bright-state display and wide viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LCD panel structure is used, then the structure is simple and easy to manufacture, but no light is emitted from positive viewing angle resulting in low display visibility
Solution Approach 1:
The light extraction structure is segmented into multiple functional components: light taking grating, first wire grid structure, second wire grid structure, and electrode structures. Each component performs a specific function in the light manipulation process, enabling light to be extracted and emitted from the positive viewing angle while maintaining manufacturing feasibility through modular design
Solution Approach 2:
The patent introduces wire grid structures with specific light transmitting axis directions to control light polarization and propagation in different dimensions. By arranging wire grids with perpendicular light transmitting axes and controlling electrode orientation angles, the system redirects light emission from traditional side-viewing geometry to enable positive viewing angle emission
2Illumination intensity
If light extraction structures are added to enable positive viewing angle emission, then display visibility is improved, but manufacturing complexity increases
Solution Approach 1:
The electrode structures serve multiple functions: they control liquid crystal molecule deflection, generate diffraction grating effects, and their orientation angles (10° to 80° relative to light transmitting axis) enable both light extraction and viewing angle control. This multi-functionality reduces the need for separate components, simplifying the overall manufacturing process despite the advanced functionality
Solution Approach 2:
The patent optimizes specific parameters such as the included angle between electrode extension direction and light transmitting axis (10° to 80°), and the relationship between light taking grating projection area and wire grid structure projection area. These parameter optimizations enable effective light extraction while maintaining compatibility with existing manufacturing processes
3Adaptability or versatility
If conventional single-direction light emission is used, then the display structure is simple, but viewing angle is limited
Solution Approach 1:
The patent uses controllable liquid crystal molecules that can be deflected by electric fields to dynamically form diffraction gratings. This dynamic control allows the display to adapt to different viewing angles and lighting conditions, transforming the static light emission structure into a dynamically adjustable system that enhances viewing versatility
Solution Approach 2:
The wire grid structures act as intermediaries between the light guide plate and the external environment. By controlling the polarization state and propagation direction of light through these wire grids, the system mediates light transmission to achieve wide viewing angles while maintaining a relatively simple overall structure
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 enables light emission from a positive viewing angle, enhancing display visibility and contrast by scattering collimated light into multidirectional divergent light, thus allowing users to view content from any direction with improved brightness and clarity.
Implementation Method 1
a light guide plate, configured to propagate light incident at a set angle by total reflection
Implementation Method 2
An electric field is applied to control liquid crystal molecules in the liquid crystal layer to deflect
Implementation Method 3
controlling, by the electric field, the liquid crystal layer to be equivalent to a diffraction grating structure
Implementation Method 4
scattering collimated light into multidirectional divergent light
Data Source
AI summary
Embodiments of the present disclosure provide a display panel, a driving method thereof and a display device. The display panel includes: a light guide plate, configured to propagate light incident at a set angle by total reflection; an opposite substrate, arranged opposite to the light guide plate; a liquid crystal layer, arranged between the light guide plate and the opposite substrate; and a plurality of light extraction structures. Each light extraction structure includes: a light taking grating arranged on a surface of the light guide plate, a first wire grid structure arranged between the light guide plate and the liquid crystal layer, a second wire grid structure arranged between the liquid crystal layer and the opposite substrate, and a first electrode structure and a second electrode structure arranged between the light guide plate and the opposite substrate. A direction of a light transmitting axis of the first wire grid structure is vertical to a direction of a light transmitting axis of the second wire grid structure. The first electrode structure is of a blocky structure. The second electrode structure includes a plurality of strip-shaped sub-electrodes which are parallel to each other; and an included angle between an extension direction of the sub-electrode and the direction of the light transmitting axis of the first wire grid structure ranges from 10° to 80°.