PSA LCD Pixel Electrode Eight-Domain Pattern for Viewing Angle
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Solution Overview
Problem
Current PSA LCD panels face challenges with color-shift and color washout phenomena when viewing angles change, which are not adequately addressed by existing designs, particularly in larger dimensions.
Innovation Solution
The design of the pixel electrode is modified to create eight domains instead of four, using separated first and second pixel electrodes with distinct patterns and voltage levels to control crystal molecule orientation and electric fields, thereby reducing color-shift and washout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MVA technology with protrusions or slits is used to control crystal molecule splay, then viewing angle is improved, but manufacturing complexity increases and brightness decreases
Solution Approach 1:
The patent extracts the light-blocking protrusions/slits from the MVA structure and replaces them with a PSA-based pixel electrode pattern. The pixel electrode includes a transparent conductive layer with a specific pattern (ridges or protrusions formed by photolithography) that controls crystal orientation without the complex multi-layer structure of MVA, thereby reducing manufacturing complexity while maintaining wide viewing angle capability
Solution Approach 2:
The pixel electrode pattern in the PSA LCD serves multiple functions: it controls crystal molecule orientation (replacing the protrusion function), maintains transparency for light passage, and enables wide viewing angle through the specific geometric pattern. This multi-functional design eliminates the need for separate protrusion structures, simplifying manufacturing
2Adaptability or versatility
If MVA technology with protrusions is used to control crystal splay, then viewing angle is improved, but brightness is reduced due to light blocking
Solution Approach 1:
The patent removes the light-blocking protrusions from the MVA design and replaces them with a transparent pixel electrode pattern. The pixel electrode uses a transparent conductive material with a geometric pattern that controls crystal orientation through its optical and electrical properties rather than physical light-blocking structures, thereby maintaining brightness while achieving wide viewing angle
Solution Approach 2:
The patent utilizes the optical properties of the pixel electrode pattern, specifically its transparency and light interaction characteristics. The patterned transparent conductive layer modifies light transmission through interference and diffraction effects based on its geometric structure, enabling viewing angle control without absorbing or blocking light like opaque protrusions would
3Ease of manufacture
If PSA technology with four domains is used to simplify manufacturing, then manufacturing cost is reduced, but color-shift and color washout at large viewing angles persist
Solution Approach 1:
The patent segments the pixel electrode into multiple distinct regions or domains with different pattern orientations. Instead of a single uniform pattern, the pixel electrode contains multiple patterned regions that independently control crystal orientation in different directions, creating more domains (beyond the conventional four) to better manage color-shift and washout effects at extreme viewing angles while maintaining PSA manufacturing simplicity
Solution Approach 2:
The patent applies different pattern configurations to different regions of the pixel electrode. Each local region has a specific pattern orientation and geometry tailored to control crystal molecules in that particular area, optimizing performance for specific viewing directions. This local customization of pattern quality allows the single-layer PSA structure to achieve multi-domain control without increased manufacturing complexity
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 viewing angles and reduces color washout, enhancing display quality by allowing for better control of crystal molecule orientation and electric field strength across multiple domains.
Implementation Method 1
an electric field is generated that forces the crystal molecules in the liquid crystal layer to change their orientation
Implementation Method 2
the monomers are added into the liquid crystal layer such that when the voltage signal is applied onto the common electrode and the pixel electrode 105, the crystal molecules tend in the predetermined inclined angle with the monomers tending the same direction. A power light (visible or ultra violet light) or heat treatment is conducted such that the monomers combined together to form the polymers tending in the predetermined inclined angle.
Data Source
AI summary
A PSA LCD panel includes a plurality of pixel units. Each of the pixel units includes a first pixel electrode and a second pixel electrode separated from the first pixel electrode. Each of the first and second pixel electrodes has a pattern scattered from a center in such a manner to form four domains.