Liquid Crystal Display Light-Shielding Layer Orientation
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Solution Overview
Problem
Liquid crystal display devices with light-shielding parts experience a decrease in brightness due to the alignment defects and disclinations caused by electric fields between pixel electrodes, leading to reduced contrast and brightness.
Innovation Solution
A liquid crystal display device design where the light-shielding layer extends in the Y-axis direction to overlap with the inter-counter electrode region and inter-pixel region, reducing the surface area of the light-shielding layer and minimizing the impact of alignment defects, thereby suppressing the decrease in brightness and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-shielding layer is provided to cover alignment defects and disclinations, then display contrast is improved, but display brightness decreases
Solution Approach 1:
The light-shielding layer is selectively positioned only in the inter-pixel regions where alignment defects and disclinations occur, rather than covering the entire display area. This localized approach shields harmful optical effects at defect locations while preserving light transmission in the pixel display regions, thus improving contrast without significantly reducing overall brightness
Solution Approach 2:
The light-shielding layer is divided into multiple segments corresponding to different inter-pixel regions between adjacent pixel electrodes. Each segment is independently positioned to cover specific alignment defects and disclinations, allowing precise control over where light shielding occurs while maintaining brightness in the functional pixel areas
2Reliability
If the light-shielding layer covers the inter-pixel region and inter-counter electrode region, then alignment defects are minimized, but the surface area of the light-shielding layer increases
Solution Approach 1:
The light-shielding layer is positioned only in specific inter-pixel regions where alignment defects and disclinations are generated by electric fields between pixel electrodes with different polarities. This selective localization ensures the light-shielding layer covers only the necessary areas to suppress alignment defects, minimizing its total surface area while maintaining effective defect suppression
Solution Approach 2:
The light-shielding layer is configured to extend in the column direction (Y-axis) rather than covering the entire pixel width, utilizing the vertical dimension to provide effective shielding along the electric field lines where alignment defects occur. This dimensional optimization reduces the horizontal footprint and total surface area of the light-shielding layer while maintaining its protective function
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 design effectively reduces the surface area of the light-shielding layer, minimizing brightness loss and maintaining high contrast by aligning the light-shielding part with the direction of alignment defects, thus enhancing the overall display brightness and contrast.
Implementation Method 1
a liquid crystal layer 30 The liquid crystal layer 30 includes a first region 30a such that the first region 30a and the first opposing portion 21a overlap but the first region 30a and the first pixel electrode 11 do not overlap when projected onto the X-Y plane
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes a first substrate unit including pixel electrodes arranged in a matrix configuration, a second substrate unit including counter electrodes, and a liquid crystal layer. The pixel electrodes include a first and a second pixel electrode arranged to be adjacent along one of the row direction or the column direction. An inter-pixel region is provided between the first and the second pixel electrodes. The counter electrodes include a first and a second opposing portion arranged to be adjacent along the other of the row direction or the column direction. An inter-counter electrode region is provided between the first and the second opposing portions. The inter-counter electrode region overlaps the inter-pixel region. A light-shielding layer is provided in the second substrate unit, and covers the inter-counter electrode region and the inter-pixel region.