Array Substrate Blocking Pattern for LCD Brightness and Noise
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Solution Overview
Problem
In-plane switching mode liquid crystal display (LCD) devices face issues with brightness due to light blocking by electrodes and wavy noise caused by semiconductor layers reacting to backlight dimming frequency, leading to reduced image quality.
Innovation Solution
The implementation of a blocking pattern, either under or over the semiconductor layer, to prevent light interference and shield electric fields, combined with a reduced number of mask processes for manufacturing, enhances brightness and reduces wavy noise by using a substrate with a gate line, data line, and thin film transistor configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductive materials are used for electrodes to increase brightness, then light transmission is improved, but manufacturing complexity increases due to additional mask processes
Solution Approach 1:
The patent combines the blocking pattern formation with existing mask processes for pixel electrode or common electrode formation. By integrating the blocking pattern into the same mask process that forms the transparent electrode patterns, the patent eliminates the need for separate blocking pattern deposition and patterning steps, thereby reducing manufacturing complexity while maintaining the brightness improvement achieved through transparent conductive materials
Solution Approach 2:
The mask pattern used for forming pixel electrodes or common electrodes is designed to simultaneously serve as the blocking pattern. This multi-functional approach allows a single mask process to accomplish both electrode formation and light blocking functions, reducing the total number of manufacturing steps while maintaining both brightness enhancement and noise prevention capabilities
2Object-affected harmful factors
If semiconductor layer width is increased to reduce wavy noise, then noise reduction is improved, but aperture ratio decreases leading to reduced brightness
Solution Approach 1:
The patent applies different properties to different regions: the semiconductor layer is positioned only in non-aperture regions (peripheral areas) where it provides noise prevention through increased width, while the aperture regions (central pixel areas) maintain their original design for optimal light transmission. This localized approach ensures that the semiconductor layer's noise-reducing function is applied only where it is needed, without compromising the brightness in the light-emitting aperture regions
Solution Approach 2:
The patent segments the substrate into aperture regions and non-aperture regions, with the semiconductor layer confined to the non-aperture regions. This segmentation allows the semiconductor layer to be widened in specific areas for noise reduction while keeping the aperture regions free from additional structures that would block light, thereby simultaneously achieving noise reduction and maintaining brightness
3Object-affected harmful factors
If blocking pattern is added to prevent light interference, then wavy noise is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the blocking pattern formation process with the existing transparent electrode formation process. The same mask that defines the pixel electrodes or common electrodes also defines the blocking patterns, allowing both structures to be formed simultaneously in a single deposition and patterning step. This integration eliminates the need for separate blocking pattern manufacturing steps, thereby preventing light interference while avoiding increases in manufacturing complexity
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 increases the brightness of the LCD device and minimizes wavy noise, resulting in improved image quality and reduced manufacturing complexity.
Implementation Method 1
a first blocking pattern comprising an opaque material is disposed under the semiconductor layer
Implementation Method 2
An electric field is induced between the electrodes by applying a voltage to each electrode. An alignment direction of liquid crystal molecules changes in accordance with a variation in the intensity or the direction of the electric field
Data Source
AI summary
An array substrate for an in-plane switching mode liquid crystal display device includes a substrate, a gate line disposed along a first direction on the substrate, a data line disposed along a second direction and crossing the gate line to define a pixel region, a thin film transistor connected to the gate line and the data line, pixel electrodes disposed in the pixel region and connected to the thin film transistor, common electrodes disposed in the pixel region and alternating with the pixel electrodes, a semiconductor layer underlying the data line and including a portion having a width greater than a width of the data line, and a first blocking pattern comprising an opaque material and disposed under the semiconductor layer.