Curved PDLC Display Panel Layout for Uniform Thin-Screen Luminance
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving high luminance and uniformity across large display screens while maintaining a thin profile, particularly in see-through displays using polymer dispersed liquid crystal (PDLC) materials, due to light loss from diffraction and scattering.
Innovation Solution
The display device incorporates a curved liquid crystal panel with a polymer dispersed liquid crystal layer and a light source positioned on the back surface, separated by an air layer, emitting light in an oblique direction relative to the panel surface, with specific curvature and irradiation angles to minimize light attenuation and enhance luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a flat liquid crystal panel is used with a light source positioned close to achieve high luminance, then the device thickness can be reduced, but light reflection and scattering increase causing non-uniform luminance distribution across the display screen
Solution Approach 1:
The liquid crystal panel is configured with a curved surface rather than a flat surface. This curvature modifies the path of light passing through the panel, reducing the effects of diffraction and scattering that cause non-uniform luminance distribution. The curved surface helps to equalize the luminance across the display area while maintaining the thin profile and high luminance characteristics.
2Length of stationary object
If the light source is positioned close to the liquid crystal panel to maintain a thin profile, then device thickness is reduced, but light loss from diffraction and scattering increases
Solution Approach 1:
The curved surface of the liquid crystal panel optimizes light propagation paths, reducing diffraction and scattering losses even when the light source is positioned close to the panel. This allows the device to maintain a thin profile while minimizing energy loss from light diffusion.
3Manufacturing precision
If a curved liquid crystal panel is used to reduce light reflection and scattering, then luminance uniformity is improved, but the device complexity increases
Solution Approach 1:
The liquid crystal panel itself is formed with a curved surface, integrating the optical correction function directly into the panel structure rather than requiring separate optical elements. This approach improves luminance uniformity while minimizing additional device complexity, as the curvature is a fundamental property of the panel rather than an added component.
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 configuration reduces light reflection and scattering, resulting in improved luminance and contrast ratio across the display screen, especially at the center, while maintaining a thin profile.
Implementation Method 1
applying voltage to the liquid crystal composition sealed between a pair of substrates to change the alignment of liquid crystal components in the liquid crystal composition based on the applied voltage, thus controlling the amount of light passing through the liquid crystal display device
Implementation Method 2
This configuration reduces light reflection and scattering, resulting in improved luminance and contrast ratio across the display screen
Implementation Method 3
This configuration reduces light reflection and scattering, resulting in improved luminance and contrast ratio across the display screen
Data Source
AI summary
The display device includes: a liquid crystal panel including a pair of substrates and a polymer dispersed liquid crystal layer held between the pair of substrates; and a light source disposed on a back surface side of the liquid crystal panel. The liquid crystal panel is curved such that a center in a curving direction along a surface of the liquid crystal panel protrudes toward a front surface side or the back surface side of the liquid crystal panel relative to two end portions in the curving direction. The light source is disposed, in a plan view, along at least one of the two end portions of the liquid crystal panel extending in a direction perpendicular to the curving direction. The liquid crystal panel has a curvature of 1/(W1×40) or more and 1/(W1×1.25) or less.