LCD Panel Electrode Inclination and Signal Modification
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in reducing response time while maintaining luminance, as existing technologies often compromise on either one or the other due to the pre-twist angle of LC molecules affecting rotation range and light transmission.
Innovation Solution
The proposed solution involves an LCD device with a pixel electrode and common electrode configuration that allows for the inclination of liquid crystal molecules at an angle with respect to the pixel electrode, combined with a gray voltage generator and image signal modification assembly to generate modified signals for improved response speed and luminance. This configuration includes a data driver that selects data voltages from a range of gray voltages to optimize LC molecule alignment for enhanced light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If LC molecules are pre-twisted to decrease response time, then response speed is improved, but rotation angle range is reduced and luminance decreases
Solution Approach 1:
The patent changes the pre-twist angle parameter from conventional values (10-30 degrees) to a smaller range (0-10 degrees), which reduces the rotation angle range limitation while still providing sufficient response speed improvement. This parameter optimization resolves the contradiction by finding a sweet spot that balances response time and luminance.
2Reliability
If pixel electrode and common electrode overlap to generate storage capacitance, then storage capacitance is improved, but aperture ratio is reduced and luminance decreases
Solution Approach 1:
The patent applies local quality by creating protrusions only in specific regions where storage capacitance is needed, rather than having the common electrode overlap the pixel electrode across the entire display area. This localized approach maintains sufficient storage capacitance while preserving the aperture ratio and luminance in the majority of the pixel area.
Solution Approach 2:
The common electrode is segmented into multiple regions: overlapping regions with the pixel electrode for storage capacitance, and non-overlapping regions for light transmission. This segmentation allows the system to simultaneously achieve both storage capacitance and high luminance by distributing different functions to different spatial zones.
3Adaptability or versatility
If field-generating electrodes have cutouts or protrusions to improve viewing angle, then viewing angle is improved, but aperture ratio is reduced and luminance decreases
Solution Approach 1:
The patent introduces cutouts and protrusions only in specific local regions of the field-generating electrodes rather than across the entire electrode structure. This localized modification achieves the necessary viewing angle improvement while minimizing the impact on the overall aperture ratio and luminance.
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
The approach effectively increases the response speed of LC molecules while minimizing luminance loss, achieving a balance between faster response times and maintaining high display brightness by adjusting the angle of LC molecule inclination and using a sophisticated signal modification process.
Implementation Method 1
A longitudinal axis of the liquid crystal molecule may be inclined at an angle with respect to the length of the pixel electrode. The angle may be greater than 0 degree and less than or equal to 10 degrees.
Implementation Method 2
The LCD displays images by applying voltages to the field-generating electrodes to generate an electric field in the LC layer, which determines orientations of LC molecules in the LC layer to adjust polarization of incident light.
Implementation Method 3
The LCD displays images by applying voltages to the field-generating electrodes to generate an electric field in the LC layer, which determines orientations of LC molecules in the LC layer to adjust polarization of incident light.
Data Source
AI summary
A liquid crystal display device having a first substrate and a second substrate facing the first substrate, a liquid crystal layer interposed between the first substrate and the second substrate, a pixel electrode formed over the first substrate, a common electrode formed over the first substrate with insulating from the pixel electrode, wherein a portion of the common electrode overlaps with the pixel electrode, includes a gray voltage generator generating a plurality of gray voltages, an image signal modification assembly configured to receive a first image signal, a second image signal, and a third image signal for subsequent three frames and modify the second image signal based on the first image signal and the third image signal, and a data driver configured to provide a data voltage selected from the plurality of gray voltages to the pixel electrode corresponding to the modified signal in the image signal modification assembly. A longitudinal axis of the liquid crystal molecule is inclined at an angle with a longitudinal pixel electrode.