Liquid Crystal Display Panel Alignment Patterns for Touch Function
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Solution Overview
Problem
Liquid crystal display panels with a touch function face issues of 'bruising' or undesirable picture trails when pressed, and increasing the number or size of alignment protrusions to improve viewing angle characteristics decreases transmissivity.
Innovation Solution
A liquid crystal display panel design featuring a plurality of pixels with a first and second alignment pattern on the counter electrode, intersecting at expanding alignment portions, which regulate liquid crystal molecule alignment without compromising transmissivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of alignment protrusions is increased to improve viewing angle characteristics, then the viewing angle is improved, but the transmissivity is decreased
Solution Approach 1:
The alignment control function is segmented into two parts: alignment protrusions for basic alignment and expanding alignment portions at intersections for enhanced alignment regulation. This segmentation allows each component to be optimized independently, with the expanding portions strategically placed only at critical intersection points rather than uniformly across the entire surface, thus maintaining high transmissivity while achieving wide viewing angles.
Solution Approach 2:
The expanding alignment portions are locally concentrated at the intersecting regions of first and second alignment patterns, rather than being uniformly distributed. This local quality approach ensures that alignment regulation is enhanced precisely where needed (at intersections where liquid crystal alignment is most critical) while minimizing the overall area occupied by alignment structures, thereby preserving high transmissivity.
2Adaptability or versatility
If the display panel is equipped with touch function and is pressed by fingers, then touch operation is enabled, but an undesirable trail of picture is generated ('bruising')
Solution Approach 1:
The expanding alignment portions are formed in advance at the intersecting regions of alignment patterns, creating pre-defined areas of enhanced alignment regulation. This preliminary action ensures that when touch pressure is applied, the liquid crystal molecules are already constrained by the expanded alignment structures at critical points, preventing the formation of picture trails during finger movement across the display.
3Adaptability or versatility
If many alignment protrusions or large alignment protrusions are arranged, then viewing angle characteristic is improved, but the transmissivity is decreased
Solution Approach 1:
The alignment structure is segmented into standard alignment protrusions and larger expanding alignment portions. The expanding portions are strategically placed only at intersecting regions of first and second alignment patterns, rather than uniformly distributing many protrusions across the entire surface. This segmentation reduces the total area occupied by alignment structures while maintaining effective alignment control where it is most needed.
Solution Approach 2:
Larger expanding alignment portions are locally concentrated at the intersecting regions of alignment patterns, where enhanced alignment regulation provides the greatest benefit for achieving wide viewing angles. This local quality approach ensures that the increased size of alignment portions is confined to specific critical areas rather than being distributed uniformly, thereby minimizing the overall area occupied by alignment structures and preserving high transmissivity.
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 design achieves wide viewing angles without 'bruising' and maintains high transmissivity by strategically forming alignment patterns and expanding alignment portions to enhance alignment regulation.
Implementation Method 1
a plurality of pixels arranged in a first direction and a second direction orthogonally crossing with the first direction; an array substrate including a plurality of pixel electrodes arranged corresponding to the respective pixels; a counter substrate arranged opposing the array substrate with a gap therebetween; a liquid crystal layer held between the array substrate and the counter substrate
Data Source
AI summary
A liquid crystal display panel includes a plurality of pixels arranged in a first direction and a second direction orthogonally crossing with the first direction. A first alignment pattern is formed in the counter electrode. The first alignment pattern faces the pixel electrode and extending in the first direction. A second alignment pattern is formed in the counter electrode. The second alignment pattern also faces the pixel electrode and extends in the second direction intersecting with the first alignment pattern. An expanding alignment portion is arranged at the intersecting portion of the first alignment pattern and the second alignment pattern. The first and second alignment patterns are formed of alignment slits or alignment protrusions arranged in the counter substrate.