LCD Heating Layer for Rapid Cold Startup
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Solution Overview
Problem
Liquid crystal display (LCD) devices do not operate normally at lower temperatures, causing usage inconveniences, especially in cold environments, leading to delayed startup times which can affect safety in applications like GPS in vehicles.
Innovation Solution
Incorporating a heating layer with flexible printed circuits (FPCs) and a passivation layer in the LCD structure, connected to a PCB, to rapidly raise the temperature of the liquid crystal to operational levels using a voltage difference, ensuring quick startup even in cold conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If LCD operates at lower temperatures without heating, then energy consumption is reduced, but the liquid crystal cannot operate normally and startup time is extended
Solution Approach 1:
The heating layer is activated before the LCD operates at normal temperature to pre-heat the liquid crystal layer, enabling the liquid crystal to reach its operating temperature range faster and reducing the warm-up time from several minutes to a much shorter duration
2Loss of time
If a heating layer is added to the LCD structure, then startup time at low temperatures is reduced, but device complexity increases
Solution Approach 1:
The heating layer is integrated into the LCD structure by forming it on the same substrate as the liquid crystal layer, and the flexible printed circuit board serves dual purposes as both the heating element carrier and the signal transmission medium, thereby reducing overall device complexity despite adding heating functionality
Solution Approach 2:
The flexible printed circuit board performs multiple functions: it transmits drive signals to the LCD pixels and simultaneously serves as the heating element when voltage is applied, eliminating the need for a separate heating component and reducing structural complexity
3Power
If FPCs are connected to PCB with heating layer, then heating efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The heating layer is divided into multiple independent heating zones corresponding to different regions of the LCD, each zone can be independently controlled through separate FPC connections, allowing for localized heating and reducing the overall connection precision requirement while maintaining heating efficiency
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
Enables normal operation of LCDs within a short period at reduced temperatures, enhancing usability and safety by quickly bringing the liquid crystal to operational temperature.
Implementation Method 1
rapidly raise the temperature of the liquid crystal to operational levels using a voltage difference
Data Source
AI summary
A display device includes a first substrate, a heating layer formed on the first substrate, an insulating layer having a first opening formed on the heating layer, at least one switching device, two contact pads formed on the insulating layer, and respectively electrically connected to the scan line and the data line, a capacitor, a passivation layer covering the switching device and the capacitor, and a pixel electrode formed on the passivation layer and electrically connected to the drain of the switching device. The source of the switching device is connected to the data line. The passivation layer has a plurality of second openings exposing the contact pads.