Liquid Crystal Display Electrode Stage Positioning
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Solution Overview
Problem
Liquid crystal display devices face challenges in achieving high response speed and contrast without the need for an optically compensating film, particularly in transitioning from splay to bend alignment states for black display, which affects residual retardation and manufacturing costs.
Innovation Solution
A liquid crystal display device design featuring a first substrate with a first electrode, stages, and a second substrate with a third electrode, where the electrode formation surfaces are positioned closer to the second substrate than the alignment films, allowing for vertical alignment at no voltage and splay alignment at applied voltage, eliminating the need for an optically compensating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optically compensating film is used to achieve high contrast in OCB mode, then residual retardation is compensated, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the optically compensating film from the conventional OCB mode structure. By redesigning the electrode configuration and alignment film positioning, the invention achieves residual retardation compensation without requiring the additional compensating film layer, thereby reducing device complexity while maintaining high contrast performance
Solution Approach 2:
The patent changes the positioning parameter of the alignment film relative to the electrode formation surface. Specifically, the alignment film is positioned such that its outer peripheral portion is lower than the electrode formation surface, creating a stepped structure that enables self-alignment and eliminates the need for optically compensating films, thus resolving the contradiction between contrast and device complexity
2Ease of manufacture
If alignment film is positioned at the same level as electrode formation surface, then manufacturing is simpler, but residual retardation cannot be compensated without optically compensating film
Solution Approach 1:
The patent implements preliminary action by pre-positioning the alignment film at a lower level than the electrode formation surface during the manufacturing process. This stepped structure is formed in advance, enabling the liquid crystal molecules to self-align properly without requiring additional optically compensating films, thus maintaining ease of manufacture while achieving high contrast
Solution Approach 2:
The patent introduces a vertical dimension difference between the alignment film and electrode formation surface by creating a stepped structure. This dimensional change allows the alignment film to be positioned at a lower level, enabling residual retardation compensation without optically compensating films while maintaining manufacturing simplicity
3Speed
If OCB mode is used for high response speed, then response time is reduced, but optically compensating film is required increasing manufacturing cost
Solution Approach 1:
The patent extracts and removes the optically compensating film from the OCB mode structure. By implementing the stepped positioning of the alignment film relative to the electrode formation surface, the invention achieves the high response speed characteristics of OCB mode without requiring the additional compensating film, thereby reducing device complexity and manufacturing cost
Solution Approach 2:
The patent changes the vertical positioning parameter of the alignment film to create a stepped structure where the alignment film is lower than the electrode formation surface. This parameter change enables the liquid crystal display to achieve OCB-mode-like response speed without the need for optically compensating films, resolving the contradiction between response speed and device 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 design achieves high contrast and response speed comparable to OCB mode without the optically compensating film, reducing manufacturing costs and complexity.
Implementation Method 1
The liquid crystal layer 40 is made of a positive-type liquid crystal material. When a voltage is applied to the liquid crystal layer 40, the alignment of the liquid crystal molecules 40 changes into splay alignment.
Implementation Method 2
The liquid crystal layer 40 is made of a positive-type liquid crystal material
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate and a liquid crystal layer. The first substrate includes a first electrode, a stage including an electrode formation surface, a switching element, a second electrode and a first vertical alignment film. The second substrate includes a third electrode and a second vertical alignment film. The electrode formation surface is positioned closer to the second substrate than a portion of the first vertical alignment film, which opposes the first electrode.