Transverse Field LCD Reflectance Azimuth Dependence
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Solution Overview
Problem
Liquid crystal display devices of the transverse electric field type face challenges in achieving high reflectance due to azimuth angle dependence of the view angle, which limits their performance.
Innovation Solution
A liquid crystal display device configuration featuring a first substrate with strip electrodes arranged in a specific direction to generate a transverse electric field, a liquid crystal layer with molecules oriented in that direction, and a second substrate with an electrode that can generate a transverse electric field, allowing the liquid crystal layer to switch between transparency and scattering modes by applying voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If rubbing is performed in a direction orthogonal to strip electrodes to create light scattering, then scattering light is generated, but reflectance decreases in directions other than the initial orientation direction
Solution Approach 1:
The patent introduces a second substrate with an electrode facing the first substrate across the liquid crystal layer, adding a dimensional element to the electrode structure. This dual-substrate electrode configuration creates a transverse electric field that enables light scattering while maintaining high reflectance by controlling liquid crystal molecule orientation in multiple directions rather than relying on single-direction rubbing.
2Adaptability or versatility
If rubbing is performed to orient liquid crystal molecules, then initial orientation direction is established, but azimuth angle dependence limits view angle increase
Solution Approach 1:
By adding the second substrate with an electrode facing the first substrate, the patent creates a transverse electric field configuration that acts in a different dimension. This enables the liquid crystal molecules to be oriented not just by unidirectional rubbing but by the transverse field between substrates, reducing azimuth angle dependence and expanding the effective view angle.
Solution Approach 2:
The patent combines multiple functional elements: strip electrodes on the first substrate, a liquid crystal layer with specific molecular orientation properties, and an additional electrode on the second substrate. This composite structure integrates both rubbing-oriented initial alignment and transverse electric field control to achieve superior view angle characteristics while maintaining reflectance.
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 enhances reflectance and reduces the influence of azimuth angle dependence, thereby increasing the view angle and improving light scattering performance.
Implementation Method 1
a first electrode portion that includes a plurality of strip electrodes arranged in a first direction and that is configured to generate a transverse electric field in the first direction
Implementation Method 2
a liquid crystal layer in which liquid crystal molecules are oriented in the first direction when the transverse electric field is not generated
Implementation Method 3
the liquid crystal layer is configured to exhibit transparency when no voltage is applied thereto and to exhibit a scattering property when a voltage is applied thereto
Data Source
AI summary
According to an aspect, a liquid crystal display device includes: a first substrate provided with a first electrode portion that includes a plurality of strip electrodes arranged in a first direction and that is configured to generate a transverse electric field in the first direction; a liquid crystal layer in which liquid crystal molecules are oriented in the first direction when the transverse electric field is not generated; a second substrate facing the first substrate across the liquid crystal layer; and an electrode provided at the second substrate.