Lateral Electric Field LCD Pixel Segmentation for Viewing Angle and Luminance
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving both high luminance and wide viewing angles, as current IPS and FFS modes either compromise on aperture ratio or viewing angles when combined, and previous attempts to integrate both modes have not optimized individual advantages effectively.
Innovation Solution
A lateral electric field type liquid crystal display device is designed with pixels divided into IPS and FFS regions, where the pixel and common electrodes are formed with transparent conductive films, and the second region's electrode is in a plan shape to form storage capacitance, optimizing tilt angles for each mode to enhance both luminance and viewing angles without reducing aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IPS mode is used to achieve wide viewing angles, then viewing angle is improved, but aperture ratio is reduced
Solution Approach 1:
The pixel electrode and common electrode are divided into a first region with linear parallel electrodes (IPS mode) and a second region with overlapping electrodes (FFS mode), allowing each region to contribute different functions to the overall display performance
Solution Approach 2:
Different electrode configurations are applied to different regions of the pixel: the first region uses linear parallel electrodes for wide viewing angles, while the second region uses overlapping electrodes for high luminance and storage capacitance
2Illumination intensity
If FFS mode is used to achieve high luminance, then aperture ratio is improved, but viewing angle is reduced
Solution Approach 1:
The pixel is segmented into two functional regions with different electrode configurations, allowing the FFS mode region to provide high luminance while the IPS mode region maintains wide viewing angles
Solution Approach 2:
The invention merges IPS mode and FFS mode within the same pixel structure, combining the advantages of both modes to achieve both wide viewing angles and high luminance simultaneously
3Adaptability or versatility
If linear parallel electrodes are used in entire pixel region, then viewing angle is improved, but storage capacitance is insufficient
Solution Approach 1:
The pixel electrode and common electrode are segmented into a first region for viewing angle control and a second region for storage capacitance formation, with each region optimized for its specific function
Solution Approach 2:
The second region is specifically designed with overlapping electrode configuration to provide sufficient storage capacitance, while the first region maintains linear parallel configuration for wide viewing angles
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 combines the benefits of IPS and FFS modes, achieving high luminance and wide viewing angles while maintaining a high aperture ratio, as demonstrated by simulations showing improved transmittance and viewing angle properties.
Implementation Method 1
the pixel electrode and the common electrode formed linearly in parallel to each other in the first region rotate liquid crystal molecules in the region by a lateral electric field applied between the both electrodes
Implementation Method 2
axes of liquid crystal molecules are rotated within a plane in parallel to the substrate by a lateral electric field
Implementation Method 3
a part where the pixel electrode and the common electrode overlap with each other forms a storage capacitance
Data Source
AI summary
A lateral electric field type liquid crystal display device includes a pixel electrode and a common electrode made with a transparent conductive film formed on different layers on a first substrate via an insulating film. Each pixel is divided into a first region and a second region. In the first region, the pixel electrode and the common electrode formed linearly substantially in parallel to each other rotate liquid crystal molecules in the region by a lateral electric field applied between the both electrodes. In the second region, at least the electrode on a lower layer side out of the pixel electrode and the common electrode is in a plan shape, and a part where the pixel electrode and the common electrode overlap with each other forms a storage capacitance.