LCD Electrode Cutout Design for Transmittance Stability
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Solution Overview
Problem
Liquid crystal displays (LCDs) face transmittance deterioration due to irregular movement of liquid crystal molecules at the end portions and center of cutouts where stem portions extend in different directions, especially when increasing pixel resolution and forming field generating electrodes on one substrate.
Innovation Solution
The LCD design includes a substrate with a gate line, data line, passivation layers, and electrodes featuring cutouts and branch electrodes, where a second cutout is strategically placed near the end and center of the first cutout to enhance the electric field intensity, preventing irregular movement of liquid crystal molecules by maintaining a specific thickness and interval configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the angle differentiation method is applied to prevent irregular liquid crystal molecule movement, then display quality is improved, but transmittance deteriorates
Solution Approach 1:
The patent applies local quality by creating different electrode thicknesses in specific regions. The first electrode has a first thickness in a first region and a second thickness (different from the first) in a second region. This local variation in thickness generates differentiated electric fields that prevent irregular liquid crystal molecule movement while maintaining overall transmittance, resolving the contradiction between display quality and transmittance.
2Measurement precision
If pixel resolution is increased, then display quality is improved, but transmittance deteriorates
Solution Approach 1:
The patent applies parameter changes by varying the thickness parameter of the first electrode across different regions. This thickness parameter change creates localized electric field variations that prevent liquid crystal molecule irregular movement, allowing the system to maintain high resolution while preserving transmittance performance.
3Adaptability or versatility
If field generating electrodes are formed on one substrate, then wide viewing angle is achieved, but transmittance deteriorates at cutout regions
Solution Approach 1:
The patent applies local quality by creating different electrode thicknesses in specific regions. The first electrode has a first thickness in a first region and a second thickness (different from the first) in a second region. This local variation in thickness generates differentiated electric fields that prevent liquid crystal molecule irregular movement while maintaining overall transmittance, resolving the contradiction between display quality and transmittance.
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 effectively prevents transmittance deterioration by stabilizing liquid crystal molecule orientation, maintaining high transmittance even with increased pixel resolution and wide viewing angles.
Implementation Method 1
displays images by applying voltages to field-generating electrodes to generate an electric field in an LC layer that determines orientations of LC molecules therein to adjust polarization of incident light
Implementation Method 2
liquid crystal molecules disposed at an end portion of the cutout and a portion where stem portions of the cutouts extending in different directions meet
Implementation Method 3
a second cutout overlapping a portion of the plurality of first cutouts, and the second cutout is provided to be close to the end of the first cutout
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the invention includes a substrate, a gate line and a data line disposed on the substrate, a first passivation layer disposed on the gate line and the data line, a first electrode disposed on the first passivation layer, a second passivation layer disposed on the first electrode, and a second electrode disposed on the second passivation layer and including a plurality of first cutouts and a plurality of branch electrodes defined by the plurality of first cutouts, wherein the second passivation layer has a second cutout overlapping a portion of the plurality of first cutouts, and the second cutout is defined close to the end of the first cutout.