Semi-transmissive LCD Slit Electrode Orientation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semi-transmission type liquid crystal display devices face challenges in maintaining high image quality due to difficulties in controlling liquid crystal orientation, leading to defects like disclination and reduced viewing angles, especially when combining reflecting and transparent electrodes.
Innovation Solution
A liquid crystal display device with a cell gap adjusting film in the reflection region and a slit portion between the reflection and transmission regions, allowing for controlled liquid crystal orientation and preventing interference between the two regions, thereby enhancing image quality and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If radial gradient orientation of liquid crystal is implemented to widen viewing angle, then viewing angle is improved, but orientation control becomes difficult and defects like disclination increase
Solution Approach 1:
The pixel electrode is divided into a reflection region and a transmission region by a slit portion. The reflection region has a first electrode pattern and the transmission region has a second electrode pattern, allowing independent orientation control in each region. This segmentation enables the reflection region to achieve radial gradient orientation for wide viewing angle while the transmission region maintains proper orientation control to prevent defects.
Solution Approach 2:
Different electrode patterns are applied to different regions: the reflection region uses a pattern that promotes radial gradient orientation of liquid crystal molecules to widen viewing angle, while the transmission region uses a different pattern that ensures proper orientation control. This local differentiation allows each region to have optimized properties for its specific function.
2Adaptability or versatility
If both reflecting electrode and transparent electrode are provided in the same pixel, then semi-transmission display is achieved, but liquid crystal orientation disorder increases and image quality deteriorates
Solution Approach 1:
The pixel is segmented into a reflection region with a reflecting electrode and a transmission region with a transparent electrode, separated by a slit portion. This spatial segmentation allows both display modes to coexist in the same pixel without causing liquid crystal orientation disorder, thereby maintaining high image quality while achieving semi-transmission versatility.
Solution Approach 2:
The slit portion acts as an intermediary element between the reflection region and transmission region. It prevents the electrode patterns from directly interfering with each other, allowing the reflecting electrode and transparent electrode to function independently without causing orientation defects, thus preserving image quality while enabling multi-mode display.
3Illumination intensity
If cell gap thickness is reduced in reflection region to half of transmission region, then reflection display performance is improved, but liquid crystal orientation control becomes more difficult
Solution Approach 1:
The reflection region is designed with a cell gap that is half the thickness of the transmission region, optimizing it for reflection display performance. Meanwhile, the transmission region maintains its original cell gap thickness for proper transmission mode operation. The slit portion ensures that the different cell gap structures do not interfere with each other's orientation control, allowing each region to achieve its optimal performance.
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 improves image quality and viewing angles by controlling liquid crystal orientation, reducing defects and maintaining clarity in both reflection and transmission modes.
Implementation Method 1
Orientation of a liquid crystal of the liquid crystal layer can be controlled by providing the cell gap adjusting film in the reflection region performing a display of a reflecting mode
Implementation Method 2
there are a number of places where directions of orientation of liquid crystals are different; there are problems that orientation control of a liquid crystal is difficult, a defect such as a disclination easily occurs
Implementation Method 3
a reflection region performing a display of a reflecting mode
Implementation Method 4
a transmission region performing a display of a transmission mode
Data Source
AI summary
The present invention provides a liquid crystal display device including a liquid crystal layer disposed between a first substrate and a second substrate, a pixel electrode in a reflection region and a transmission region over the first substrate, a film for adjusting a cell gap in the reflection region over the first substrate, and an opposite electrode in the reflection region and the transmission region over the second substrate. The pixel electrode in the reflection region is provided over the film and reflects light. The pixel electrode in the transmission region transmits light. The pixel electrode in the reflection region and the transmission region includes a slit. The slit is overlapped with at least a part of a step portion which is provided by the film between the reflection region and the transmission region.