ITO Coated LCD Front Plate Integral Heater Design
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Solution Overview
Problem
Existing liquid crystal display (LCD) technologies face challenges with temperature sensitivity, requiring costly and weight-added external heaters that are prone to damage and optical issues, leading to reduced image luminance and contrast.
Innovation Solution
An optically transparent electrically conductive ITO layer is directly coated on the front surface of the LCD color plate, serving as both a heater and charge dissipator, reducing the need for separate heating layers and enhancing conductive heat transfer with uniform current injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heaters are integrated into LCD panel designs by optically laminating or bonding a cover glass with an ITO coating heater, then the display can be heated to proper operating temperature, but the cost increases, weight increases, and optical transmission is reduced
Solution Approach 1:
The patent combines the heater function with the existing front color plate by directly coating ITO onto it, merging the heating element with the structural component. This eliminates the need for a separate heater glass layer, reducing weight while maintaining heating capability
Solution Approach 2:
The ITO coating on the front color plate serves dual functions: as an electrical charge draining layer for FFS technology operation and as a heating element. This multi-functionality eliminates the need for separate dedicated heater components, reducing overall weight
2Temperature
If external heaters are integrated into LCD panel designs by optically laminating or bonding a cover glass with an ITO coating heater, then the display can be heated to proper operating temperature, but the cost increases
Solution Approach 1:
The patent combines the heater function with the existing front color plate by directly coating ITO onto it, merging the heating element with the structural component. This eliminates the need for a separate heater glass layer, reducing material costs and manufacturing complexity
Solution Approach 2:
The ITO coating on the front color plate serves dual functions: as an electrical charge draining layer for FFS technology operation and as a heating element. This multi-functionality eliminates the need for separate dedicated heater components, reducing overall cost
3Temperature
If external heaters are integrated into LCD panel designs by optically laminating or bonding a cover glass with an ITO coating heater, then the display can be heated to proper operating temperature, but optical transmission is reduced and specular reflection increases
Solution Approach 1:
The patent combines the heater function with the existing front color plate by directly coating ITO onto it, eliminating the need for additional external glass layers. This reduces the number of optical interfaces, minimizing reflection and maximizing light transmission
Solution Approach 2:
The patent uses index-matching dielectric layers as intermediary layers between the ITO coating and the liquid crystal layer. These layers have refractive indices that match both the ITO and the liquid crystal, reducing optical reflection at interfaces and improving light transmission
4Temperature
If separate external ITO heating layers are laminated onto the front of the LCD color plate or onto the rear of the TFT plate, then heating function is added, but device complexity and handling damage risk increase
Solution Approach 1:
The patent combines the heater function with the existing front color plate by directly coating ITO onto it, merging the heating element with the structural component. This eliminates the need for separate heater glass layers and their associated lamination processes, reducing device complexity
Solution Approach 2:
The ITO coating on the front color plate serves dual functions: as an electrical charge draining layer for FFS technology operation and as a heating element. This multi-functionality eliminates the need for separate dedicated heater components, simplifying the overall device structure
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 approach reduces power consumption, eliminates weight and cost associated with external heaters, improves optical performance by minimizing reflections and light loss, and prevents handling damage, while maintaining uniform heating and image quality.
Implementation Method 1
This conductive material, particularly indium tin oxide (ITO), acts as an integral heater. The direct contact of the optically transparent electrically conductive material on the LCD front plate facilitates conductive heat transfer to the liquid crystal layer.
Implementation Method 2
The direct contact of the optically transparent electrically conductive material on the LCD front plate facilitates conductive heat transfer to the liquid crystal layer.
Data Source
AI summary
A flat panel display has an optically-transparent electrically-conductive layer, especially an indium tin oxide layer, directly formed on an outer front surface of a liquid crystal display (LCD) assembly having a front plate, a rear plate, and a layer of liquid crystal material interposed between said front and rear plates. The optically-transparent electrically-conductive layer is preferably uniform and functions as an integral heater when connected to a direct current power source.