Resin Black Matrices for LCD Light Leakage and Crosstalk Reduction
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Solution Overview
Problem
Existing liquid crystal display devices suffer from light leakage and crosstalk due to electrostatic capacitance between scan lines, signal lines, and pixel electrodes, leading to increased power consumption and display defects.
Innovation Solution
The implementation of resin black matrices or insulative light-blocking members, which are broader than the signal and scan lines, positioned below the pixel electrodes to prevent light leakage and reduce electrostatic capacitance without overlapping with the pixel electrodes, allowing for narrower signal and scan lines and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pixel electrodes are made to overlap scan lines and signal lines to prevent light leakage, then light leakage is reduced, but electrostatic capacitance between pixel electrodes and scan/signal lines increases causing crosstalk
Solution Approach 1:
A light-blocking member composed of resin and carbon particles is introduced as an intermediary substance between the pixel electrodes and the scan/signal lines. This light-blocking member prevents light leakage while electrically insulating the pixel electrodes from the conductive lines, thereby eliminating the source of electrostatic capacitance and preventing crosstalk.
2Object-affected harmful factors
If signal lines and scan lines are made wider to improve light blocking, then light leakage is reduced, but aperture ratio decreases and electrostatic capacitance increases
Solution Approach 1:
The light-blocking member serves as a dedicated light-blocking intermediary that allows the scan lines and signal lines to be made narrower without compromising light leakage prevention. The light-blocking member fills the space between the narrowed lines and pixel electrodes, maintaining effective light blocking while preserving aperture ratio.
3Area of stationary object
If signal lines and scan lines are made narrower to increase aperture ratio, then aperture ratio increases, but light leakage increases
Solution Approach 1:
The light-blocking member acts as a compensatory intermediary that makes up for the reduced light-blocking capability of narrower scan lines and signal lines. By positioning this light-blocking material between the narrowed lines and pixel electrodes, effective light leakage prevention is achieved while maintaining the benefits of narrower lines for aperture ratio.
Solution Approach 2:
The light-blocking member is selectively positioned in the critical region between the scan/signal lines and pixel electrodes where light leakage occurs. This localized light-blocking approach provides targeted light leakage prevention without requiring the entire line structure to be wider, thus preserving aperture ratio.
4Object-generated harmful factors
If storage capacitor electrodes are enlarged to reduce electrostatic capacitance effects, then crosstalk is reduced, but aperture ratio decreases
Solution Approach 1:
The light-blocking member serves as an additional intermediary that reduces electrostatic capacitance between pixel electrodes and scan/signal lines without requiring enlargement of storage capacitor electrodes. This approach maintains aperture ratio while effectively reducing crosstalk through electrical insulation.
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 solution effectively prevents light leakage and crosstalk, reduces power consumption, and maintains high aperture ratio without enlarging storage capacitor electrodes, resulting in a more efficient liquid crystal display device with improved display quality.
Implementation Method 1
resin black matrices 45, 46 that are embedded into the interlayer 39 over the scan lines 32 and signal lines 33
Implementation Method 2
a liquid crystal layer placed between said two substrates
Data Source
AI summary
A liquid crystal display device of the present invention comprises an array substrate equipped with signal lines and scan lines deployed in a matrix arrangement, thin film transistors (TFTs) provided near the intersections of the signal lines and scan lines, and pixel electrodes of which one is provided in each of the pixel domains delimited by the signal lines and scan lines; a color filter substrate on which are formed color filters and common electrodes; and a liquid crystal layer placed between said two substrates; wherein the pixel electrodes are positioned so as not to overlap the signal lines, or not to overlap the scan lines, or not to overlap either, when viewed from above, and below the spaces between adjacent pixel electrodes, resin black matrices are deployed so as to overlap the pixel electrodes when viewed from above.