Color Filter Substrate Joule Heating for LCD Startup
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Solution Overview
Problem
Liquid crystal display devices in low-temperature environments, such as winter conditions, take a long time to start due to reduced response speed and inefficient heating methods, which also lead to increased costs and manufacturing complexities from additional components like conductive plastic sheets or touch panels with separate heaters.
Innovation Solution
A liquid crystal display device with a transparent conductive film on the color filter substrate, where electrodes for heating are formed on both sides and connected to lead members that extend over the TFT substrate, allowing for efficient heating of the color filter substrate using a flexible printed circuit board or conductive tape, ensuring uniform heating and rapid operation in low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a heater is mounted on the liquid crystal display device to heat it in low-temperature environments, then the startup time is reduced, but the device complexity and manufacturing cost increase due to additional components like conductive plastic sheets or separate heater assemblies
Solution Approach 1:
The patent combines the heater function with the existing transparent electrode that is already part of the liquid crystal display structure. The transparent electrode serves dual purposes: as an electrical conductor for the display function and as a heating element for low-temperature operation. This eliminates the need for separate heater components and reduces device complexity while maintaining the ability to heat the display in cold environments
Solution Approach 2:
The transparent electrode is designed to perform multiple functions: it serves as both the electrical electrode for liquid crystal control and as a heating element when voltage is applied. This multi-functionality allows the same component to address both display operation and temperature management, reducing the total number of parts needed in the system
2Stability of the object's composition
If a conductive plastic sheet is mounted as a separate heater, then uniform heating is achieved, but the manufacturing cost and assembly steps increase
Solution Approach 1:
The heating function is merged into the existing transparent electrode structure rather than being implemented as a separate conductive plastic sheet. The transparent electrode naturally covers the entire display area, providing uniform heating without requiring additional manufacturing steps for attaching separate heating components
3Reliability
If the touch panel is heated first before the liquid crystal display panel, then the touch panel operates reliably, but the overall startup time increases because heat transmission to the liquid crystal panel takes additional time
Solution Approach 1:
The heating function is merged with the liquid crystal display panel's existing electrode structure, allowing simultaneous heating of both the touch panel and liquid crystal panel. This eliminates the sequential heating process and reduces overall startup time while maintaining reliable operation of both components
4Adaptability or versatility
If an IPS liquid crystal display device is used to achieve wide viewing angle, then viewing angle characteristic is improved, but the response speed at low temperature is reduced
Solution Approach 1:
The patent applies temperature control as a parameter change to compensate for the reduced response speed of IPS liquid crystal at low temperatures. By heating the liquid crystal layer to maintain it above the freezing point, the response speed is improved while preserving the wide viewing angle characteristics of the IPS configuration
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 significantly reduces the time required for the liquid crystal display device to reach operational temperature, ensuring quick startup in low-temperature environments while maintaining uniform heating and reducing manufacturing complexity and costs.
Implementation Method 1
an electrode for heating the color filter substrate by supplying an electric current to a transparent electrode
Data Source
AI summary
In a liquid crystal display panel, a liquid crystal layer is sandwiched between a TFT substrate and a color filter substrate. An ITO film is formed on a front surface of the color filter substrate. By supplying an electric current to the ITO film at the time of staring an operation of the liquid crystal display panel, a temperature of the liquid crystal layer is elevated to a level which allows the liquid crystal layer to perform a normal operation within a short time. By forming a plating electrode on two sides of the color filter substrate, it is possible to uniformly supply an electric current to the ITO film thus enabling uniform heating of the color filter substrate.