Liquid Crystal Display With 11-13 μm Electrode Spacing
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Solution Overview
Problem
Conventional liquid crystal displays using lateral electric fields struggle to achieve sufficient brightness and maintain high display quality due to limitations in dielectric constant anisotropy and horizontal inter-electrode distance, leading to increased power consumption and decreased transmittance.
Innovation Solution
The liquid crystal display employs a specific configuration with a horizontal inter-electrode distance of 11 μm to 13 μm and liquid crystal materials with a dielectric constant anisotropy of 10 or more, optimizing the alignment of liquid crystal molecules with oblique electric fields to enhance transmittance and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the horizontal inter-electrode distance is reduced to increase pixel density, then the aperture ratio increases, but the liquid crystal molecule alignment and optical transmittance deteriorate
Solution Approach 1:
The patent applies parameter changes by specifying a horizontal inter-electrode distance of 11-13 μm and requiring a dielectric constant anisotropy (Δε) of 10 or more for the liquid crystal material. These parameter changes optimize the balance between aperture ratio and brightness, allowing sufficient liquid crystal molecule alignment even at reduced electrode distances, thereby maintaining high transmittance while increasing pixel density.
Solution Approach 2:
The patent utilizes the dynamic response of liquid crystal molecules to oblique electric fields. By applying voltage between pixel electrodes and common electrodes positioned on both sides, the liquid crystal molecules dynamically reorient themselves in response to the electric field, enabling effective switching and maintaining optical transmittance despite the reduced horizontal inter-electrode distance.
2Ease of manufacture
If conventional liquid crystal materials with lower dielectric constant anisotropy are used, then the manufacturing cost is reduced, but the switching efficiency and display quality deteriorate
Solution Approach 1:
The patent specifies a dielectric constant anisotropy (Δε) of 10 or more as a critical parameter change. This parameter specification ensures high switching efficiency and display quality by enabling effective liquid crystal molecule alignment with the oblique electric field, while the horizontal inter-electrode distance of 11-13 μm is optimized to work synergistically with this material property.
3Illumination intensity
If the horizontal inter-electrode distance is increased to improve liquid crystal alignment, then the optical transmittance increases, but the pixel density and aperture ratio decrease
Solution Approach 1:
The patent optimizes the horizontal inter-electrode distance to 11-13 μm, which is sufficiently large to allow proper liquid crystal molecule alignment and maintain high optical transmittance, yet small enough to preserve high pixel density and aperture ratio. This parameter optimization works in conjunction with the dielectric constant anisotropy requirement of Δε ≥ 10.
4Illumination intensity
If higher power is consumed to compensate for low transmittance, then the brightness is maintained, but the power consumption increases
Solution Approach 1:
The patent achieves high transmittance through parameter optimization: horizontal inter-electrode distance of 11-13 μm and dielectric constant anisotropy of 10 or more. This high transmittance reduces the power required to achieve sufficient brightness, as more light naturally passes through the liquid crystal layer without requiring increased backlight power.
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 achieves a brightness of 70% to 95% of comparative examples while maintaining high display quality and reducing power consumption, allowing for a wide viewing angle and effective optical compensation.
Implementation Method 1
a dielectric constant anisotropy of the liquid crystal layer is 10 or more
Implementation Method 2
liquid crystal molecules are switched by a lateral electric field which is substantially parallel to a major surface of the array substrate
Data Source
AI summary
According to one embodiment, a liquid crystal display includes a first substrate including main pixel electrodes, a second substrate including main common electrodes extending substantially in parallel to the main pixel electrodes and arranged on both sides of each of the main pixel electrodes as seen from above, and a liquid crystal layer including liquid crystal molecules held between the first substrate and the second substrate. A horizontal inter-electrode distance in a first direction between the main pixel electrode and the main common electrode is in a range of 11 μm or more and 13 μm or less, and a dielectric constant anisotropy of the liquid crystal layer is 10 or more and 16 or less.