LCD Blocking Member Reduces Parasitic Capacitance
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with parasitic capacitance generation between data lines and pixel electrodes due to misalignment, leading to brightness deviations and distorted liquid crystal molecule arrangements, which affect motion picture display characteristics and power consumption.
Innovation Solution
The implementation of a liquid crystal display design featuring sub-pixel electrodes, thin film transistors, and a blocking member that overlaps the pixel electrode to reduce parasitic capacitance, along with a storage electrode line and oblique cutouts in the pixel and common electrodes to control electric field orientation and minimize misalignment effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data lines and pixel electrodes are positioned close to each other for high-resolution display, then display resolution is improved, but parasitic capacitance between data lines and pixel electrodes increases causing brightness deviations
Solution Approach 1:
A blocking member is introduced as an intermediary element positioned between the data line and the pixel electrode. This blocking member acts as a shield that reduces the parasitic capacitance coupling between the data line and pixel electrode, thereby minimizing brightness deviations while maintaining the close positioning required for high display resolution
Solution Approach 2:
The pixel electrode is divided into first and second sub-pixel electrodes, and the blocking member is strategically positioned to overlap specific portions of these sub-pixel electrodes. This segmentation allows for selective reduction of parasitic capacitance in critical areas while maintaining overall display performance
2Ease of manufacture
If data lines and pixel electrodes are misaligned during manufacturing, then manufacturing tolerance is relaxed, but brightness uniformity deteriorates due to parasitic capacitance variations
Solution Approach 1:
The blocking member serves as a compensatory intermediary structure that reduces the sensitivity of parasitic capacitance to misalignment between data lines and pixel electrodes. By positioning the blocking member to overlap with sub-pixel electrodes, it provides a stabilizing effect that maintains brightness uniformity even when manufacturing misalignments occur
Solution Approach 2:
The blocking member changes the electrical parameter (parasitic capacitance) of the system by introducing a shielding structure. This parameter change reduces the variation in parasitic capacitance that would otherwise occur due to misalignment, thereby maintaining brightness uniformity across the display
3Adaptability or versatility
If liquid crystal molecules are arranged in distorted patterns to accommodate electrode layouts, then electrode design flexibility is improved, but display quality deteriorates due to texture formation
Solution Approach 1:
The blocking member acts as an intermediary structure that mitigates the adverse effects of distorted liquid crystal molecule arrangements. By reducing parasitic capacitance, it minimizes the distortion forces acting on liquid crystal molecules, thereby preventing texture formation and maintaining display quality even with flexible electrode designs
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 design effectively reduces parasitic capacitance and minimizes brightness deviations, maintaining uniformity in pixel brightness and preventing texture formation due to misalignments, thereby enhancing motion picture display characteristics and reducing power consumption.
Implementation Method 1
it is easy for parasitic capacitance to be generated between a data line and a pixel electrode in the LCDs
Implementation Method 2
applying voltages to the field-generating electrodes to generate an electric field in the LC layer that determines the orientations of LC molecules therein to adjust polarization of incident light
Implementation Method 3
adjust polarization of incident light
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the present invention includes a pixel electrode having first and second sub-pixel electrodes; a first thin film transistor connected to the first sub-pixel electrode; a second thin film transistor connected to the second sub-pixel electrode; a first data line connected to the first thin film transistor; a second data line connected to the second thin film transistor; a gate line connected to the first and second thin film transistors and crossing the first and second data lines; and a blocking member overlapping at least one portion of the first sub-pixel electrode.