LCD Pixel Electrode Design for Uniform Side Visibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display (LCD) devices face challenges in achieving uniform side visibility and gamma mixing, particularly at low gray levels, due to variations in fringe field intensity and liquid crystal molecule alignment across different regions of the pixel electrode.
Innovation Solution
The LCD device incorporates a pixel electrode design with specific sub-edge portions and branch portions on a substrate, featuring varying shortest distances to shield electrodes and pretilted liquid crystal molecules in different regions, which allows for controlled electric field formation and improved liquid crystal alignment, enhancing side visibility and gamma mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel electrode design is used, then the device structure is simple, but side visibility is poor and gamma mixing is not uniform
Solution Approach 1:
The pixel electrode is divided into multiple regions including a body portion, sub-edge portions, and branch portions. Each region has different distances to the shield electrode, creating varied electric field intensities that improve side visibility and gamma mixing uniformity across the display panel.
Solution Approach 2:
Different regions of the pixel electrode are designed with specific local characteristics. The sub-edge portions have longer distances to the shield electrode compared to the body portion, creating localized electric field adjustments that enhance side visibility and reduce vertical crosstalk in specific areas.
2Reliability
If uniform electric field is applied across the pixel electrode, then the electrode design is simple, but liquid crystal alignment is non-uniform and contrast ratio varies
Solution Approach 1:
The pixel electrode design creates different electric field intensities in different regions by varying the distance to the shield electrode. The body portion has shorter distance for stronger field, while sub-edge portions have longer distance for weaker field, achieving uniform liquid crystal alignment across the entire pixel electrode.
Solution Approach 2:
The pixel electrode is segmented into regions with different distances to the shield electrode, allowing independent control of electric field intensity in each region. This segmentation enables precise control of liquid crystal molecule orientation to achieve uniform alignment and consistent contrast ratio.
3Reliability
If shield electrode is placed close to the pixel electrode, then electric field intensity is high, but vertical crosstalk increases
Solution Approach 1:
The design varies the distance between the pixel electrode and shield electrode across different regions. The body portion maintains shorter distance for high electric field intensity, while sub-edge portions have longer distance that reduces vertical crosstalk, achieving both strong field and low crosstalk simultaneously.
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 design improves side visibility by maintaining similar contrast ratios to front visibility and enables effective gamma mixing at any given gray level, reducing vertical crosstalk and enhancing overall display performance.
Implementation Method 1
The LCD device forms an electric field in the liquid crystal layer by applying voltages to the field-generating electrodes so as to determine the orientation of liquid crystal molecules in the liquid crystal layer, and displays an image by controlling the polarization of light incident thereupon using the electric field.
Data Source
AI summary
A liquid crystal display device includes a first substrate; a first pixel electrode disposed on the first substrate and including a first body portion, a first sub-edge portion on a first side of the first body portion, and a second sub-edge portion, which on a second side of the first body portion; and a shield electrode on the same layer as the first pixel electrode a shield electrode on the same layer as the first pixel electrode and extending from a first side of the first sub-edge portion in a first direction. The first body portion includes a first stem portion, a second stem portion that intersects the first stem portion, and a plurality of branch portions extending from at least one of the first stem portion and the second stem portion. The first sub-edge portion is spaced apart from the branch portions and has a bent portion.