Porous Transparent Conductive Layer for LCD Static Shielding
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Solution Overview
Problem
Conventional LCDs employing the IPS mode face issues with narrow viewing angles and image quality degradation due to external static electricity, which affects light transmittance and contrast ratio, particularly because the transparent conductive layer on the rear surface lowers transmissivity and causes light reflection.
Innovation Solution
A color filter substrate with a porous transparent conductive layer having a plurality of holes formed on the rear surface of an insulating substrate, where the holes are inclined and spaced at specific intervals to enhance light transmissivity and reduce surface reflection, thereby preventing static electricity interference and improving image display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a transparent conductive layer is formed on the rear surface of the upper substrate to shield static electricity, then static electricity shielding is improved, but transmissivity is lowered by 8% to 10%
Solution Approach 1:
The transparent conductive layer is formed with a porous structure containing multiple holes, which reduces the amount of conductive material present. This allows the layer to maintain its electrostatic shielding function while minimizing light absorption and reflection, thereby reducing transmissivity loss to less than 5%.
Solution Approach 2:
The conductive layer is positioned on the rear surface of the substrate rather than the front surface. This spatial arrangement allows the layer to shield against static electricity without directly interfering with the optical path of light passing through the color filter substrate, thus maintaining higher transmissivity.
2Object-affected harmful factors
If a transparent conductive layer is formed on the rear surface of the upper substrate to shield static electricity, then static electricity shielding is improved, but image display quality is deteriorated due to light reflection
Solution Approach 1:
The porous structure of the transparent conductive layer reduces its density and thickness, which minimizes the interface between the conductive layer and surrounding media. This reduction in interface area decreases light reflection, thereby improving image display quality while maintaining electrostatic shielding functionality.
Solution Approach 2:
By positioning the conductive layer on the rear surface of the substrate, the invention separates the electrostatic shielding function from the optical display function. This spatial separation prevents the conductive layer from directly reflecting external light that would otherwise interfere with the displayed image, thus improving contrast ratio and readability.
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 porous structure increases pixel open area by 50% or more, reducing transmissivity loss to less than 5%, enhancing brightness and readability while minimizing surface reflection and maintaining high contrast ratios.
Implementation Method 1
the transparent conductive layer 15 formed on the rear surface of the upper substrate to remove static electricity... to prevent the color filter substrate 10 as a dielectric body from being charged upon introduction of static electricity from the exterior
Implementation Method 2
the transparent conductive layer of a porous structure having a plurality of holes... to enhance light transmissivity... increasing transmissivity by causing a decrease in transmissivity of approximately 5% or less
Implementation Method 3
Each of the holes is formed inclined at an angle ranging from 20 to 50°... to reduce surface reflection... minimizing surface reflection and maintaining high contrast ratios
Data Source
AI summary
A color filter substrate for a liquid crystal display and a method of fabricating the same are provided. The color filter substrate for a liquid crystal display includes: light shielding parts formed on a front surface of a substrate at predetermined intervals to prevent light leakage; color filter Layers disposed between the light shielding parts on the front surface of the substrate and including color filter patterns of red (R), green (G) and blue (B) for implementing a color image; and a transparent conductive layer formed on a rear surface of the substrate, where the rear surface of the substrate is opposite the front surface of the substrate on which the color filter layers are formed, and formed in a porous structure having a plurality of holes spaced at predetermined intervals. Therefore, it is possible to shield an electrostatic field due to external static electricity and improve image display quality, thereby increasing high brightness characteristics and readability.