VA-LCD Pretilt Angle Control for Wide Viewing Angles
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Solution Overview
Problem
Vertical alignment liquid crystal displays (VA-LCDs) suffer from poor viewing angles due to the limitation of having only one liquid crystal pretilt angle, which necessitates dividing pixels into multiple domains to improve viewing angles, resulting in a loss of transmittance.
Innovation Solution
A display device utilizing high-quality vertical alignment (HVA) technology to form two distinct liquid crystal pretilt angles in a single panel without dividing pixels, achieved through different voltage differences between patterned common electrodes or data line signals, allowing for enhanced viewing angles without compromising transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pixels are divided into multiple domains to improve viewing angles, then viewing angle is improved, but transmittance is lost
Solution Approach 1:
The patent applies local quality by creating different liquid crystal pretilt angles in different regions (odd-numbered vs even-numbered columns or rows) of the display panel. Specifically, liquid crystals in odd-numbered columns have a first pretilt angle while those in even-numbered columns have a second pretilt angle, allowing each region to optimize for different viewing directions without requiring pixel domain division, thus maintaining transmittance while improving overall viewing angle performance
Solution Approach 2:
The patent introduces a new dimension of control by utilizing the column/row indexing dimension to differentiate pretilt angles. Instead of dividing pixels into domains within the same plane, the invention uses the spatial arrangement dimension (odd vs even columns/rows) to assign different pretilt angles, effectively adding a new degree of freedom for optimizing viewing angles without compromising transmittance
2Device complexity
If only one liquid crystal pretilt angle is used, then device complexity is reduced, but viewing angle performance deteriorates
Solution Approach 1:
The patent segments the display panel into odd-numbered and even-numbered columns or rows, with each segment having a different liquid crystal pretilt angle. This segmentation is achieved through differentiated voltage application to common electrodes in odd vs even columns/rows, allowing multiple pretilt angles to coexist in a single panel without requiring complex pixel domain division structures
Solution Approach 2:
The patent changes the pretilt angle parameter across different regions of the display panel. By applying different voltages to common electrodes in odd vs even columns or rows, the liquid crystal molecules are induced to form different pretilt angles (first pretilt angle for odd columns/rows, second pretilt angle for even columns/rows), thereby optimizing viewing angle performance without increasing structural 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
The implementation of two liquid crystal pretilt angles in a single panel significantly improves viewing angles in VA-LCDs, maintaining transmittance and enabling better image quality without the need for pixel domain division.
Implementation Method 1
liquid crystals corresponding to the plurality of pixels in odd-numbered columns have a first liquid crystal pretilt angle, and the liquid crystals corresponding to the plurality of pixels in even-numbered columns have a second liquid crystal pretilt angle
Implementation Method 2
two voltage differences are formed between the common electrode arranged above the panel close to a side of the color filter and the pixel electrode below the panel close to a side of the array side
Data Source
AI summary
The present invention discloses a display device, wherein the display device includes: a plurality of pixels arranged in an array, wherein liquid crystals corresponding to the plurality of pixels in odd-numbered columns have a first liquid crystal pretilt angle, and the liquid crystals corresponding to the plurality of pixels in even-numbered columns have a second liquid crystal pretilt angle; or, the liquid crystals corresponding to the plurality of pixels in odd-numbered rows have the first liquid crystal pretilt angle, and the liquid crystals corresponding to the plurality of pixels in even-numbered rows have the second liquid crystal pretilt angle; and wherein the first liquid crystal pretilt angle and the second liquid crystal pretilt angle are different from each other.