LCD Light-Blocking Member Segmentation for Transmittance
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Solution Overview
Problem
Current liquid crystal displays (LCDs) face challenges in maximizing transmittance, which affects their performance and viewing angle, particularly in designs that use fluorescent substances or phosphors.
Innovation Solution
The implementation of a liquid crystal display device structure that includes a first and second substrate, an alignment film, a wavelength conversion layer, a transmissive layer, a common electrode, a light-blocking member, and a liquid crystal layer, with pixel regions defined by a pixel electrode, an opening region in the light-blocking member, and a pixel overlap region where the pixel electrode overlaps the light-blocking member, enhancing transmittance through optimized liquid crystal molecule alignment and light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fluorescent substances or phosphors are used in LCDs to achieve wide viewing angles, then viewing angle is improved, but transmittance is reduced
Solution Approach 1:
The light-blocking member is divided into multiple regions including opening regions and pixel overlap regions. The pixel overlap regions are positioned at specific locations where pixel electrodes overlap with the light-blocking member, allowing selective light transmission while maintaining the light-blocking function in other areas. This segmentation enables both wide viewing angle and high transmittance by optimizing the spatial distribution of light-blocking and light-transmitting areas.
Solution Approach 2:
Different regions of the light-blocking member have different properties: opening regions allow light transmission for pixel display, while pixel overlap regions provide light blocking to reduce dark portions. The alignment film is also configured with specific alignment directions in different regions to control liquid crystal molecule orientation locally, ensuring optimal performance in each area while achieving overall high transmittance and wide viewing angle.
2Manufacturing precision
If light-blocking members are used to define pixel regions, then pixel definition is improved, but dark portions are created that reduce overall transmittance
Solution Approach 1:
The light-blocking member is segmented into opening regions and pixel overlap regions. The pixel overlap regions are strategically positioned where pixel electrodes overlap with the light-blocking member, creating a configuration that minimizes dark portions while maintaining sharp pixel boundaries. This segmentation allows the light-blocking member to define pixels precisely without creating excessive dark areas that would reduce overall transmittance.
Solution Approach 2:
The pixel overlap regions, which could be considered harmful as they block light, are converted into a beneficial feature by positioning them specifically where pixel electrodes overlap. This configuration reduces the formation of dark portions at pixel boundaries while maintaining the light-blocking function where needed, thus converting a potential harm into a benefit for improving overall transmittance.
3Stability of the object's composition
If pixel electrodes are positioned to overlap with light-blocking members, then liquid crystal alignment is improved, but light transmission is reduced in overlap regions
Solution Approach 1:
The pixel overlap regions are positioned at specific locations where liquid crystal alignment benefits from the overlap configuration, while opening regions are positioned to maximize light transmission. The alignment film is configured with specific alignment directions in different regions, allowing optimal liquid crystal alignment in pixel overlap regions while maintaining high light transmission in opening regions. This local differentiation resolves the contradiction between alignment quality and light transmission.
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 significantly improves transmittance and reduces dark portions caused by liquid crystal molecule collisions, resulting in enhanced display performance with wider viewing angles and increased color purity.
Implementation Method 1
a wavelength conversion layer, disposed on a surface of the second substrate that faces the first substrate
Implementation Method 2
Voltages are applied to the field generating electrodes to generate an electric field in the liquid crystal layer. In this manner, the alignment of liquid crystal molecules of the liquid crystal layer is determined, and polarization of incident light is controlled.
Data Source
AI summary
A liquid crystal display device includes a first substrate (FS) on which pixel regions are defined, a second substrate (SS) facing the FS, an alignment film disposed on a surface of the FS facing the SS, a wavelength conversion layer disposed on a surface of the SS facing the FS, a transmissive layer disposed on the surface of SS, a common electrode disposed on surfaces of the wavelength conversion layer and the transmissive layer facing the FS, a light-blocking member disposed on a surface of the common electrode facing the FS, and a liquid crystal layer between the alignment film and the light-blocking member. Each pixel region among the pixel regions includes: a pixel electrode disposed on the surface of the FS; an opening region in the light-blocking member; and a pixel overlap region outside the opening region, the pixel electrode overlapping the light-blocking member in the pixel overlap region.