Vertical Alignment Liquid Crystal Device Pretilt Optimization
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Solution Overview
Problem
Liquid crystal devices in hold mode exhibit significant moving image blur due to reduced response speed caused by increased transverse electric fields between pixel electrodes with closer spacing, and existing techniques are limited to cell thicknesses less than 2 μm, making it difficult to improve brightness without exacerbating blur.
Innovation Solution
A liquid crystal device with a vertical alignment configuration, where the interval between pixel electrodes, cell thickness, and pretilt angle are optimized to satisfy the relation equation −1.6×s/d+4.4≦θ≦−2.6×s/d+5.6, enhancing brightness while reducing moving image blur by adjusting the pretilt angle based on the ratio of interval to thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the interval between pixel electrodes is reduced to improve brightness, then the area occupied by pixel electrodes increases and brightness improves, but the transverse electric field between adjacent pixel electrodes increases causing response speed reduction and moving image blur
Solution Approach 1:
The patent applies parameter changes by establishing a specific relationship between the interval s, cell thickness d, and pretilt angle θ through the equation -1.6×s/d+4.4≦θ≦-2.6×s/d+5.6. This allows simultaneous optimization of brightness (through reduced interval) and response speed (through adjusted pretilt angle) by changing multiple parameters in a coordinated manner rather than independently.
2Speed
If the pretilt angle is increased to improve response speed, then response speed improves and moving image blur reduces, but the brightness improvement from reduced pixel electrode interval cannot be fully utilized
Solution Approach 1:
The patent resolves this contradiction by defining a specific range for the pretilt angle θ based on the interval s and cell thickness d through the equation -1.6×s/d+4.4≦θ≦-2.6×s/d+5.6. This ensures that the pretilt angle is optimized to maintain response speed while allowing the pixel electrode interval to be reduced for brightness improvement, achieving simultaneous optimization of both parameters.
3Adaptability or versatility
If the cell thickness is increased to improve manufacturing flexibility, then manufacturing adaptability improves, but the existing pretilt angle techniques become ineffective and moving image blur increases
Solution Approach 1:
The patent achieves universality by developing a pretilt angle control method that works across different cell thicknesses. The equation -1.6×s/d+4.4≦θ≦-2.6×s/d+5.6 incorporates the cell thickness d as a variable, allowing the same principle to be applied universally to different cell thicknesses (including those greater than 2 μm) while maintaining response speed performance and reducing moving image blur.
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 configuration improves display image brightness and reduces moving image blur by optimizing the pretilt angle, ensuring the response time of liquid crystals around pixel electrodes is within a range that minimizes blur while maintaining high brightness.
Implementation Method 1
an alignment film is provided on each of the first substrate and the second substrate, so that pretilt, inclined by a predetermined angle in a predetermined direction, is applied to liquid crystal molecules, included in the vertical alignment liquid crystal, by the corresponding alignment film
Implementation Method 2
The liquid crystal molecules are configured to maintain the pretilt when voltage is not applied thereto, and inclined so as to approach the substrate surface of the first substrate or the second substrate when voltage is applied thereto
Data Source
AI summary
A liquid crystal device includes a first substrate, a second substrate disposed to face the first substrate, a plurality of pixel electrodes arranged between the first substrate and the second substrate at intervals with each other, and a liquid crystal layer. The liquid crystal layer is interposed between the first substrate and the second substrate, and configured to include a vertical alignment liquid crystal. When the interval between the pixel electrodes adjacent to each other is s [μm], the thickness of the liquid crystal layer is d [μm] and the pretilt angle of the vertical alignment liquid crystal is θ[°], a relation equation −1.6×s/d+4.4≦θ≦−2.6×s/d+5.6 is satisfied.