Curved Display Third Polarizer Light Leakage
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Solution Overview
Problem
Curved display devices experience significant light leakage (black unevenness) near the four corners due to curvature stress on glass substrates, which affects the optical design and contrast ratio, and existing solutions either reduce glass thickness to minimize leakage but compromise panel strength or are impractical to implement.
Innovation Solution
Incorporating a third polarizer on one of the transparent substrates closer to the liquid crystal layer, with specific thickness configurations for the substrates to control light leakage while maintaining panel strength, using lyotropic or guest host liquid crystals for the polarizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If glass substrate thickness is reduced to minimize light leakage, then light leakage is reduced, but panel strength is compromised
Solution Approach 1:
The patent changes the optical parameters by introducing a third polarizer with specific transmission axis orientation (parallel to the first polarizer) and adjusts the liquid crystal layer thickness to 3 μm or less. These parameter changes reduce light leakage through optical compensation without requiring reduction of glass substrate thickness, thereby maintaining panel strength.
Solution Approach 2:
The third polarizer acts as an intermediary element between the first and second polarizers. It compensates for the phase difference (retardation) caused by the curved glass substrates, preventing light leakage at the corners without affecting the structural integrity of the glass substrates.
2Adaptability or versatility
If glass substrates are curved to create curved display, then curved display function is achieved, but retardation occurs due to photoelasticity causing light leakage
Solution Approach 1:
The patent introduces a third polarizer with transmission axis parallel to the first polarizer and configures the liquid crystal layer thickness to 3 μm or less. This parameter configuration compensates for the retardation caused by curving the glass substrates, eliminating light leakage while preserving the curved display function.
Solution Approach 2:
The patent converts the harmful effect of retardation caused by curved glass into a beneficial compensation mechanism. By adding the third polarizer and adjusting liquid crystal thickness, the system compensates for the phase difference introduced by curvature, transforming the optical defect into a controlled parameter that can be corrected.
3Device complexity
If conventional two-polarizer configuration is used in curved display, then device complexity is low, but light leakage cannot be completely eliminated
Solution Approach 1:
The patent modifies the conventional two-polarizer configuration by adding a third polarizer with specific orientation (parallel to the first polarizer) and adjusting the liquid crystal layer thickness to 3 μm or less. This parameter change effectively eliminates light leakage while adding only one additional component to the system.
4Object-affected harmful factors
If liquid crystal layer thickness is reduced to 3 μm or less, then light leakage is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent sets the liquid crystal layer thickness to 3 μm or less and configures the third polarizer's transmission axis parallel to the first polarizer. These parameter changes work together to compensate for retardation and reduce light leakage. The specific thickness requirement ensures optimal optical compensation while remaining achievable with standard manufacturing tolerances.
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
Effectively reduces local light leakage while achieving a sufficient contrast ratio without compromising the structural integrity of the curved display device, regardless of the curvature direction.
Implementation Method 1
a liquid crystal layer arranged between the first substrate and the second substrate
Implementation Method 2
a first polarizing layer arranged between the first substrate and the liquid crystal layer or on the outer surface of the first substrate; and a second polarizing layer arranged between the second substrate and the liquid crystal layer or on the outer surface of the second substrate
Implementation Method 3
retardation occurs due to the photoelasticity of glass to shift the optical design set by the polarizers, causing light leakage (black unevenness)
Data Source
AI summary
Provided is a curved display device capable of preventing or reducing local light leakage while achieving a certain contrast ratio. The curved display device includes a liquid crystal panel in a normally black mode. The liquid crystal panel includes a first polarizer, a liquid crystal cell, and a second polarizer in a stated order from a viewing surface side. The liquid crystal cell includes a first substrate including a transparent substrate, a liquid crystal layer, and a second substrate including a transparent substrate in a stated order from the viewing surface side. At least one of the first substrate or the second substrate is provided with a third polarizer on a surface of the transparent substrate closer to the liquid crystal layer.