Display Electrode Temperature Detection via Electrical Resistance
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Solution Overview
Problem
Existing liquid crystal displays face challenges in detecting surface temperature, leading to potential display defects due to temperature-related changes, as existing methods are inadequate for accurately measuring surface temperature.
Innovation Solution
A display device and method that includes a plurality of electrodes arranged in parallel on the display unit, with an applying unit that applies an electric signal, a detecting unit that measures electrical changes, and a control unit that controls the display or illuminating unit based on temperature information derived from these changes, allowing for precise temperature distribution monitoring and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is used to detect ambient temperature, then temperature control is achieved, but surface temperature cannot be detected
Solution Approach 1:
The patent uses the electrode as an intermediary element to indirectly measure surface temperature. Instead of placing a temperature sensor directly on the surface, the electrode's electrical properties (resistance, capacitance, or impedance) are measured, which change in response to temperature variations. This intermediary approach allows surface temperature detection without direct contact temperature sensors.
Solution Approach 2:
The patent replaces the mechanical/physical temperature sensor system with an electrical measurement system. By measuring electrical properties (resistance, capacitance, impedance) of the electrode that change with temperature, the system substitutes direct thermal measurement with electrical property measurement, enabling surface temperature detection through electrical changes rather than physical temperature sensing.
2Measurement precision
If multiple electrodes are arranged in parallel with extension portions and coupling portions, then temperature distribution detection is improved, but device complexity increases
Solution Approach 1:
The patent divides the electrode into multiple extension portions arranged in parallel, each capable of sensing temperature in different regions. The coupling portions connect these segmented extension portions to form a complete electrode structure. This segmentation allows the system to detect temperature distribution across different areas by measuring electrical properties of individual extension portions.
Solution Approach 2:
The electrode structure serves multiple functions: it acts as both a display control electrode and a temperature sensing element. The same electrode that controls the display also detects temperature through changes in its electrical properties, eliminating the need for separate temperature sensors and reducing overall device complexity despite the segmented structure.
3Measurement precision
If electrical changes of electrodes are detected to obtain temperature information, then surface temperature measurement is achieved, but measurement precision may be affected by electrical noise
Solution Approach 1:
The patent employs feedback mechanisms where the detected electrical changes are continuously monitored and processed to determine temperature information. By using feedback loops, the system can distinguish between actual temperature-induced electrical changes and random electrical noise, improving measurement accuracy through continuous verification and adjustment.
Solution Approach 2:
The patent measures changes in electrical parameters (resistance, capacitance, impedance) of the electrode that correlate with temperature changes. By monitoring these parameter changes and comparing them against known temperature-parameter relationships, the system can accurately determine temperature while filtering out electrical interference through pattern recognition and calibration.
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 accurate detection and control of surface temperature across the display, preventing display defects by specifying temperature information for each electrode and adjusting operations accordingly, thus maintaining optimal display performance.
Implementation Method 1
detecting electrical changes of the electrodes occurring due to the electric signal... specifying temperature information for each of the electrodes based on the electrical changes
Data Source
AI summary
A display device includes a display unit that displays an image, an illuminating unit that irradiates light to the display unit, a plurality of electrodes that are arranged on the display unit, an applying unit that applies an electric signal to the electrodes, a detecting unit that detects electrical changes of the electrodes occurring due to the electric signal, and a control unit that controls the display unit or the illuminating unit based on temperature information of the electrodes indicated by the electrical changes. Each of the electrodes includes a plurality of extension portions, and a coupling portion that couples one ends of the extension portions. A longitudinal direction of each of the extension portions is along the other direction perpendicular to the one direction. The control unit controls the display unit or the illuminating unit based on a temperature distribution of each of the electrodes in the other direction.