OLED Driving Transistor Temperature Compensation via Signal Analysis
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Solution Overview
Problem
OLED display apparatuses face instability in driving current due to temperature-induced changes in mobility and threshold voltage of driving transistors, leading to decreased picture quality and issues like residual images and Mura at low brightness levels, as existing compensation methods do not account for temperature influences during the display process.
Innovation Solution
A temperature compensation method that determines the temperature value of driving transistors in OLED display apparatuses using photoelectric display signals and anode voltage signals, calculates electrical parameter offsets, and adjusts data line signals to account for temperature changes, thereby stabilizing the driving current and improving picture quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature compensation is not applied, then the display apparatus can operate without additional compensation circuits and processing, but the driving current becomes unstable due to temperature-induced changes in mobility and threshold voltage of driving transistors
Solution Approach 1:
The display apparatus uses its own internal resources (display signals already present in the system, existing transistor parameters) to perform temperature compensation. The method extracts temperature information from the display signal itself and uses existing transistor characteristics (threshold voltage, mobility) to calculate compensation values, eliminating the need for external temperature sensors or additional compensation circuits.
Solution Approach 2:
The patent replaces physical temperature sensing mechanisms (such as external temperature sensors or thermal coupling structures) with an electronic/electrical approach. Temperature is inferred from electrical parameters (display signal characteristics, transistor electrical properties) rather than direct thermal measurement, substituting a mechanical/physical sensing system with an electrical calculation system.
2Object-affected harmful factors
If simple compensation methods are used, then the device complexity is reduced, but temperature-induced display defects such as residual images and Mura at low brightness levels cannot be prevented
Solution Approach 1:
The method changes the approach from direct temperature measurement to inferring temperature effects through electrical parameter changes. By monitoring changes in display signal characteristics and transistor electrical parameters (mobility, threshold voltage) that correlate with temperature, the system calculates compensation values that counteract temperature-induced defects without requiring physical temperature sensing.
Solution Approach 2:
The system implements a feedback mechanism where the display signal and transistor parameters are continuously monitored, temperature effects are inferred from these measurements, and compensation values are calculated and applied to counteract the detected temperature-induced variations. This closed-loop approach prevents display defects by continuously adjusting for temperature effects.
Data Source
AI summary
The present disclosure provides a temperature compensation method and device, and a display apparatus. In the temperature compensation method, a temperature value of a driving transistor corresponding to a light emitting device in the display apparatus is determined according to a photoelectric display signal of the display apparatus and/or an anode voltage signal of the light emitting device, and an electrical parameter offset of the driving transistor is calculated according to the temperature value, so as to perform real-time temperature compensation on a date line signal such as a gate voltage.