Segmented Electrode Heater for Display Panel Temperature Uniformity
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Solution Overview
Problem
Conventional liquid crystal display devices with uniform heating suffer from biased in-plane temperature distribution due to heat sources like driver circuits, leading to variations in display quality.
Innovation Solution
A display device with a display panel and a heater comprising multiple electrodes arranged at different temperatures adjacent to the panel, where a smaller voltage is applied to a second electrode heated at a lower temperature than a first electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If uniform heating is applied to the display panel, then the overall temperature is maintained, but biased in-plane temperature distribution occurs due to heat sources like driver circuits
Solution Approach 1:
The heater is divided into multiple independent electrodes (first electrode, second electrode, third electrode) with different heating characteristics. Each electrode can be controlled independently to apply different voltages and generate different heat amounts, allowing segmented heating control across different regions of the display panel.
Solution Approach 2:
Different regions of the display panel are heated with different temperatures and intensities according to their specific needs. The first electrode heats regions far from heat sources more strongly, while the second and third electrodes provide supplementary heating to regions closer to heat sources, creating localized heating zones that compensate for the biased temperature distribution.
2Speed
If a heater is added to maintain liquid crystal response characteristics at low temperature, then response speed improves, but device complexity increases
Solution Approach 1:
The multiple electrodes serve dual functions: they act as heating elements to maintain liquid crystal response characteristics at low temperatures, and simultaneously function as transparent conductive layers in the display panel structure. This multi-functionality reduces the need for separate heating components, thereby limiting the increase in device complexity.
Solution Approach 2:
The heating function is merged with the existing electrode structure of the display panel. The first, second, and third electrodes are integrated into the panel's layered construction, combining the heating mechanism with the display's electrical structure rather than adding a completely separate heating system.
3Stability of the object's composition
If multiple electrodes with different temperatures are used, then in-plane temperature distribution is improved, but control complexity increases
Solution Approach 1:
The control system utilizes the natural thermal characteristics and positional relationships of the electrodes relative to the heat sources. By applying voltages based on the predetermined arrangement and thermal properties of each electrode, the system achieves balanced temperature distribution through self-regulating thermal conduction and radiation patterns without requiring complex real-time sensing and adjustment mechanisms.
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 improves the in-plane temperature distribution of the display panel, maintaining optimal response characteristics of the liquid crystal and enhancing display quality, especially in field-sequential color displays.
Implementation Method 1
a heater including a plurality of electrodes arranged at a distance from each other and arranged adjacent to the display panel. The plurality of electrodes includes a first electrode heated at a first temperature and a second electrode heated at a second temperature lower than the first temperature
Data Source
AI summary
A display device comprises a display panel including a liquid crystal layer between a pair of substrates and a heater including a plurality of electrodes arranged at a distance from each other and disposed adjacent to the display panel. The plurality of electrodes includes a first electrode heated at a first temperature and a second electrode heated at a second temperature lower than the first temperature. Each of the plurality of electrodes may be a transparent electrode on a transparent substrate.