Display Driver Impedance Matching via Thermoelectric Temperature Sensing
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Solution Overview
Problem
Existing energy harvesting technologies in display devices do not account for temperature changes, leading to impedance mismatch issues between timing controllers and source driver integrated circuits (SD-ICs), which complicates high-speed operation.
Innovation Solution
A method and apparatus for actively adjusting the resistance of an impedance matching unit in a display driving apparatus by detecting the operating temperature of the SD-IC and adjusting the resistance accordingly, using energy harvesting technology to convert heat energy into voltage for temperature calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If energy harvesting technology is applied to convert heat energy into power, then power availability is improved, but temperature monitoring capability is lost
Solution Approach 1:
An energy harvesting device serves as an intermediary component that simultaneously performs two functions: converting heat energy to voltage for power supply and providing temperature information through the generated voltage signal. This mediator approach resolves the contradiction by making the energy conversion process itself informative.
Solution Approach 2:
The energy harvesting device is designed to perform multiple functions: it generates power from heat energy while simultaneously providing temperature data. This multi-functionality eliminates the need for separate temperature sensing components and resolves the information loss issue.
2Device complexity
If impedance matching resistance is fixed, then device complexity is reduced, but high-speed operation reliability deteriorates due to temperature-induced resistance variations
Solution Approach 1:
The impedance matching resistance is changed from a fixed value to a dynamically adjustable parameter that automatically adapts to temperature changes. The resistance value is modulated based on the voltage signal from the energy harvesting device, which reflects temperature variations, thereby maintaining reliable high-speed operation without increasing overall system complexity.
Solution Approach 2:
The impedance matching circuit performs self-adjustment using the voltage signal inherently generated by the energy harvesting device. The system uses its own operational byproducts (heat and generated voltage) to automatically compensate for temperature-induced resistance changes, eliminating the need for external temperature sensors or complex control systems.
3Measurement precision
If temperature compensation is implemented, then impedance matching accuracy is improved, but device complexity increases
Solution Approach 1:
The system achieves temperature compensation using resources already present in the operating system. The energy harvesting device naturally generates a voltage signal proportional to temperature, which is directly used to control the impedance matching resistance. This self-service approach provides accurate temperature compensation without adding external sensors or complex control circuitry.
Solution Approach 2:
The energy harvesting device's voltage output serves dual purposes: powering the circuit and providing temperature information for compensation. This multi-functional use of the same component achieves precise impedance matching without the complexity of dedicated temperature sensing and compensation systems.
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 improves the accuracy of impedance matching, enabling high-speed operation in display devices by dynamically adjusting resistance based on temperature changes.
Implementation Method 1
converting heat energy generated by the data driver into a voltage
Data Source
AI summary
Disclosed herein is a method of controlling a display driving apparatus configured to operate a display device that displays an image. The method includes receiving a first image signal (RGB) from an external system, converting the first image signal (RGB) into a second image signal (RGB′) in a format processable by a data driver, outputting the second image signal (RGB′), converting the second image signal (RGB′) into a source signal based on a data control signal generated by a timing controller, converting heat energy generated by the data driver into a voltage, calculating a temperature of the data driver based on the converted voltage, and changing a resistance for impedance matching between the timing controller and the data driver based on the calculated temperature.