Liquid Crystal Display Panel with Varying Branch Widths
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Solution Overview
Problem
Liquid crystal display panels using vertical alignment technology experience severe color shift at large viewing angles due to consistent pre-tilt angles of liquid crystal molecules, which limits their viewing angle performance.
Innovation Solution
The liquid crystal display panel features a pixel electrode structure with strip branches of varying widths and intervals on the substrates, creating different pre-tilt angles and electric field strengths to address the color shift issue, where the branches are strategically positioned and connected to divide the pixel areas into sub-pixel areas with multiple widths and intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vertical alignment technology with consistent pre-tilt angles is used, then high aperture rate and high contrast ratio are achieved, but severe color shift occurs at large viewing angles
Solution Approach 1:
The patent applies local quality by creating different pre-tilt angles in different regions of the liquid crystal layer. The pixel electrode structure is divided into multiple regions with different electrode potentials, causing liquid crystal molecules in different regions to form different pre-tilt angles. This regional variation in pre-tilt angles compensates for viewing angle-dependent color shifts while maintaining high contrast ratio and aperture rate characteristics of vertical alignment technology.
Solution Approach 2:
The patent segments the pixel electrode into multiple independent regions (first region, second region, third region, fourth region) with different electrode potentials. This segmentation allows each region to independently control the pre-tilt angle of liquid crystal molecules in its corresponding area, thereby reducing color shift at large viewing angles while maintaining the advantages of vertical alignment technology.
2Object-affected harmful factors
If strip branches with varying widths and intervals are implemented, then color shift at large viewing angles is reduced, but device complexity increases
Solution Approach 1:
The patent employs asymmetry by designing strip branches with different widths and intervals in different regions of the pixel electrode. The first, second, third, and fourth regions have asymmetric electrode configurations relative to each other, creating different electric field distributions and pre-tilt angles. This asymmetric design effectively reduces color shift at large viewing angles by diversifying the optical response across different viewing directions.
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 effectively reduces color shift at large viewing angles by providing diverse pre-tilt angles and electric field strengths, enhancing the display's color accuracy and viewing angle performance.
Implementation Method 1
different electric field strengths caused by the strip branches having different widths and intervals
Implementation Method 2
different pre-tilt angles will be provided to the liquid crystal molecules when alignment process is performed
Implementation Method 3
When a voltage is applied to and ultraviolet (UV) lights are provided to illuminate the two transparent substrates, phase separation of the reactive monomers in liquid crystal mixture are induced. Polymers are thus formed on the alignment substrates
Data Source
AI summary
The present invention provides a liquid crystal display panel and a display apparatus having the liquid crystal display panel. A second substrate of the liquid crystal display panel includes a second electrode and a plurality of pixel areas. The second electrode has a pixel electrode structure in each of the pixel areas. The pixel electrode structure includes a trunk and a plurality of branches. A distance between the two neighboring branches is an interval. Each of the branches has a width. Each of the pixel areas has at least two widths and at least two intervals.