Liquid Crystal Display Heater Line Layout for Cold Response Speed
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Solution Overview
Problem
As ambient temperature decreases, the fall response speed of liquid crystals in display devices decreases, leading to degradation in performance, including decreased brightness and potential color shifting to monochrome.
Innovation Solution
The display device incorporates heater lines with varying cross-sectional areas and resistances to uniformly heat the display panel, reducing power consumption by optimizing heat generation based on distance from the light source and drive circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the cross-sectional area of the heater line is increased to improve heating efficiency, then the response speed of liquid crystals is improved, but the power consumption increases
Solution Approach 1:
The heater line is designed with varying cross-sectional areas at different positions. The cross-sectional area is larger at positions farther from the light source unit and smaller at positions closer to the light source unit. This local variation in geometry creates non-uniform resistance distribution, optimizing heat generation at each position to match the heating requirements of different regions of the display panel.
Solution Approach 2:
The physical parameter of the heater line (cross-sectional area) is changed along its length to optimize performance. By varying the cross-sectional area, the resistance per unit length changes, which directly affects the heat generation rate (Q=I²R). This parameter change allows the heater to provide appropriate heating at different positions without requiring excessive overall power consumption.
2Device complexity
If the heater line is positioned closer to the light source unit for compact design, then the device complexity is reduced, but the temperature distribution uniformity deteriorates
Solution Approach 1:
The heater line's cross-sectional area is locally adjusted based on its position relative to the light source unit. Positions farther from the light source, which receive less heat, are equipped with larger cross-sectional areas (higher resistance) to generate more heat locally. This creates a compensated temperature distribution that maintains uniformity across the display panel.
3Use of energy by moving object
If the resistance of the heater line is increased to reduce current requirements, then the power consumption is reduced, but the heat generation capability decreases
Solution Approach 1:
The heater line is designed with position-dependent cross-sectional areas, creating local variations in resistance. This allows different segments of the heater line to have different heat generation capabilities matched to their specific heating needs, optimizing the overall power consumption while maintaining sufficient heat generation where required.
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 configuration enhances the response speed of liquid crystals, maintaining brightness and color accuracy across temperature variations, while reducing power consumption.
Implementation Method 1
a heater line, in which the heater line has a first position and a second position, in which a distance from the first position to the light source unit is smaller than a distance from the second position to the light source unit, and in which a cross-sectional area perpendicular to a longitudinal direction of the heater line at the first position is larger than a cross-sectional area perpendicular to a longitudinal direction of the heater line at the second position
Data Source
AI summary
A display device including a first substrate, a second substrate facing the first substrate, a liquid crystal layer provided between the first substrate and the second substrate, a light source unit provided outside a region where the liquid crystal layer is provided, in plan view, and a heater line, in which the heater line has a first position and a second position, in which a distance from the first position to the light source unit is smaller than a distance from the second position to the light source unit, and in which a cross-sectional area perpendicular to a longitudinal direction of the heater line at the first position is larger than a cross-sectional area perpendicular to the longitudinal direction of the heater line at the second position.