Liquid Crystal Display Surface Scattering Film Moire Elimination
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Solution Overview
Problem
Liquid crystal display devices with large screens in bright environments face issues with disturbing reflections and reduced contrast due to moire interference patterns caused by optical members between the backlight and liquid crystal layer, which affect viewing angle and color reproducibility.
Innovation Solution
A matrix-type liquid crystal display device is designed with a surface scattering film intersecting the pitch patterns of the optical sheet and pixel, featuring a light-condensing optical member with a periodic concave-convex structure and a light-scattering film with specific reflectance and scattering properties to reduce disturbing reflections and enhance bright-room contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-condensing optical member is disposed between the backlight and liquid crystal layer, then the brightness and viewing angle are improved, but moire interference patterns are generated due to optical interference with the pixel structure
Solution Approach 1:
A scattering film is introduced as an intermediary layer between the light-condensing optical member and the liquid crystal panel. This scattering film diffuses the condensed light before it reaches the pixel structure, effectively eliminating the moire interference patterns while preserving the brightness enhancement and viewing angle improvements provided by the light-condensing optical member
Solution Approach 2:
The patent changes the optical parameters of the light by introducing a scattering film that modifies the light distribution pattern. The scattering film alters the direction and intensity distribution of the condensed light, transforming the concentrated light pattern into a diffused pattern that avoids constructive interference with the pixel structure, thereby eliminating moire patterns
2Object-affected harmful factors
If surface scattering property is strengthened to blur disturbing reflection images, then the antiglare property is improved, but the light brownish looking of the display surface is strengthened to decrease the contrast in bright room
Solution Approach 1:
The scattering film is designed with spatially varying scattering properties - the scattering power is distributed non-uniformly across the film. By controlling the local scattering characteristics, the film provides sufficient surface scattering to blur disturbing reflections in specific viewing directions while maintaining adequate contrast in the front viewing direction, thus resolving the contradiction between antiglare property and bright-room contrast
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 effectively eliminates moire interference patterns, provides wide viewing angles, and enhances bright-room contrast while maintaining high display uniformity, even with strongly converging backlights.
Implementation Method 1
a first optical member having a light-condensing property
Implementation Method 2
a second optical member having a surface scattering function
Implementation Method 3
a matrix-type liquid crystal display device, comprising: a liquid crystal panel... a first optical member having a light-condensing property... a second optical member having a surface scattering function
Data Source
AI summary
A matrix-type liquid crystal display device, includes: a liquid crystal panel including: a pair of substrates disposed to face each other with at least one of the pair of substrates having an electrode; a liquid crystal layer interposed between the pair of substrates; a pair of polarizing plates disposed to sandwich the liquid crystal layer, each having a polarizing film and a protective film provided directly or indirectly on at least one surface of the polarizing film; and an optically compensatory film disposed in at least one of spaces between the liquid crystal layer and the pair of polarizing films; a backlight comprising a light source; a first optical member having a light-condensing property; and a second optical member having a surface scattering function.