Liquid Crystal Display Wall Electrode Enclosure and Transmittance
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Solution Overview
Problem
Liquid crystal display devices with wall electrodes face challenges in enclosing liquid crystals effectively, leading to reduced yield and increased costs in mass production, as well as issues with transmittance due to the influence of electric potentials from drain and gate lines, which affect display characteristics and cause domain formation in multi-domain structures.
Innovation Solution
The implementation of a liquid crystal display device design featuring large and small walls, a TFT-side electrode, and a wall electrode, with a common electrode formed via the small wall over the drain and gate lines, and a storage capacitor electrode facing a planar electrode across an interlayer insulating film, which facilitates stable liquid crystal enclosure and reduces the impact of electric potentials, thereby improving transmittance and reducing domain formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wall electrodes are used to control liquid crystal alignment, then viewing angle characteristics are improved, but liquid crystal enclosure becomes difficult and manufacturing yield decreases
Solution Approach 1:
The wall electrode structure is segmented into multiple parts: a first wall electrode extending along the first side, a second wall electrode extending along the second side, and a third wall electrode connecting them. This segmentation allows each electrode to be optimized for its specific function while collectively achieving both liquid crystal enclosure and viewing angle control.
Solution Approach 2:
The wall electrodes extend in different directions (first direction along the first side, second direction along the second side) to form a three-dimensional enclosure structure. This multi-dimensional arrangement enables complete liquid crystal enclosure while maintaining the electrode functionality for alignment control.
2Device complexity
If drain line and gate line are positioned close to pixels for compact design, then device density is improved, but electric potential influence increases and transmittance deteriorates
Solution Approach 1:
A protective electrode is introduced as an intermediary element between the drain line/gate line and the liquid crystal layer. This protective electrode blocks the harmful electric potential influence from the signal lines while allowing the compact layout to be maintained.
Solution Approach 2:
The harmful electric potential influence is extracted and isolated from the liquid crystal layer by introducing the protective electrode, which separates the signal line electric fields from the liquid crystal alignment region.
3Reliability
If multi-domain structure is used to improve viewing angle, then alignment control is improved, but domain formation occurs and transmittance in pixel end portion decreases
Solution Approach 1:
The wall electrode structure is designed with different characteristics at different locations: the first and second wall electrodes have specific dimensions and positions optimized for their respective sides, while the third connecting electrode provides transition. This local optimization prevents domain formation at pixel boundaries while maintaining overall alignment control.
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 ensures stable liquid crystal enclosure, reduces parasitic capacitance, and enhances transmittance by blocking the influence of electric potentials, leading to improved yield and cost reduction while maintaining high transmittance across the entire pixel.
Implementation Method 1
an electric field in a direction parallel to a substrate is applied to rotate the liquid crystal molecule in a horizontal plane so as to control backlight
Implementation Method 2
liquid crystal molecules are horizontally aligned. In this state, an electric field in a direction parallel to a substrate is applied to rotate the liquid crystal molecule in a horizontal plane
Implementation Method 3
an electrode that blocks influence of electric potentials of the drain line and the gate line is not disposed on these drain line and gate line
Implementation Method 4
a storage capacitor electrode facing a planar electrode across an interlayer insulating film
Data Source
AI summary
A liquid crystal display device using a wall electrode facilitates enclosing of liquid crystal and improves transmittance. The liquid crystal display device includes a plurality of pixels arranged in a matrix. Each of the pixels includes large walls, a small wall, a TFT-side electrode, and a wall electrode. The large walls extend in a long-side direction of the pixel at both ends of the pixel. The small wall extends parallel to the large walls between the large walls. The TFT-side electrode is formed on the small wall. The wall electrode is formed on a side surface of the large wall and formed between the large wall and the small wall. The large walls are separated between the pixels in the long-side direction. The small wall which has a height lower than the large walls is arranged between the separated large walls.