VA LCD Panel with Multi-Region Pre-Tilt Angles
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Solution Overview
Problem
Current liquid crystal display panels in vertical alignment mode face challenges in improving viewing angle characteristics, particularly due to the complexity of pixel circuits and reduced transmittance in ladder alignment patterns, which affect luminance and aperture ratio.
Innovation Solution
A liquid crystal display panel design featuring four alignment regions with different inclination azimuths and tilt angles, including a first and second alignment region with distinct pre-tilt angles, allows for improved viewing angle characteristics without a complicated pixel circuit by adjusting the alignment of liquid crystal molecules based on voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-pixel driving technique is used to improve viewing angle characteristics, then gamma curve distortion is corrected, but luminance is reduced in front observation
Solution Approach 1:
The patent changes the physical parameters of liquid crystal molecules by creating multiple alignment regions with different pre-tilt angles (first alignment region with first pre-tilt angle, second alignment region with second pre-tilt angle). This allows the liquid crystal layer to achieve different molecular orientations that improve viewing angle characteristics while maintaining luminance, resolving the contradiction between viewing angle adaptation and illumination intensity.
Solution Approach 2:
The patent divides the liquid crystal layer into multiple alignment regions (first alignment region and second alignment region) with different pre-tilt angles. Each region is aligned in a different direction, and their combined effect improves viewing angle characteristics without requiring complex multi-pixel driving circuits, thus maintaining luminance while achieving gamma curve correction.
2Reliability
If ladder alignment pattern is used to prevent display defect, then alignment disorder is reduced, but mode efficiency is significantly reduced due to increased dark lines
Solution Approach 1:
The patent applies different pre-tilt angles to different local regions (first alignment region with first pre-tilt angle, second alignment region with second pre-tilt angle) without requiring ladder alignment patterns. This local differentiation achieves alignment uniformity while avoiding the dark lines that reduce mode efficiency, thus resolving the contradiction between reliability and productivity.
3Adaptability or versatility
If complicated pixel circuit is used to achieve multi-pixel driving, then viewing angle characteristics are improved, but aperture ratio is reduced
Solution Approach 1:
The patent extracts the viewing angle improvement function from the complex pixel circuit and implements it through the liquid crystal layer's inherent multi-region alignment structure. By taking out the need for complicated driving circuits and achieving the same effect through molecular alignment, the aperture ratio is maintained while viewing angle characteristics are improved.
4Stability of the object's composition
If polymer-sustained alignment treatment is applied to provide initial alignment, then liquid crystal molecules are aligned, but desired initial alignment is difficult to achieve
Solution Approach 1:
The patent achieves precise initial alignment by controlling the pre-tilt angle parameter in different alignment regions during the liquid crystal layer formation process. By setting specific pre-tilt angles (first pre-tilt angle and second pre-tilt angle) in different regions, the desired initial alignment is achieved with high manufacturing precision without relying on polymer-sustained alignment treatment.
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 enhances viewing angle characteristics by optimizing the alignment of liquid crystal molecules, improving luminance and transmittance, and simplifying the pixel circuit structure, thereby addressing the limitations of existing technologies.
Implementation Method 1
a liquid crystal layer 40 containing liquid crystal molecules 41... with no voltage applied to the liquid crystal layer 40, the liquid crystal molecules 41 aligning substantially vertically to the first substrate 30 and the second substrate 50 with inclinations along the inclination azimuths
Implementation Method 2
each of the four alignment regions including a first region 12 where the liquid crystal molecules 41 in the liquid crystal layer 40 have a relatively small average tilt angle and a second region 13 where the liquid crystal molecules 41 in the liquid crystal layer 40 have a relatively large average tilt angle
Implementation Method 3
with voltage applied to the liquid crystal layer 40, the liquid crystal molecules 41 having greater inclinations along the inclination azimuths
Data Source
AI summary
The present invention provides a liquid crystal display panel sequentially including: a first substrate provided with a pixel electrode for each pixel; a liquid crystal layer containing liquid crystal molecules; and a second substrate provided with a counter electrode, the liquid crystal display panel including pixels each including at least four alignment regions with different inclination azimuths of the liquid crystal molecules, with no voltage applied to the liquid crystal layer, the liquid crystal molecules aligning substantially vertically to the first substrate and the second substrate with inclinations along the inclination azimuths, the liquid crystal molecules having a twist angle of substantially 0° in each alignment region, at least one of the four alignment regions including a first region where the liquid crystal molecules have a relatively small average tilt angle and a second region where the liquid crystal molecules have a relatively large average tilt angle.