Predictive Pixel Temperature Control in Display Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face issues with temperature-induced variations in drain-source current characteristics of driving transistors, leading to increased luminance and a vicious cycle of heat buildup, which deteriorates image quality, and existing solutions rely on temperature sensors for control.
Innovation Solution
A display device and driving method that predict pixel temperature based on sensing information, calculate current control amounts, and adjust output grayscales without using a temperature sensor, utilizing a sensing circuit and grayscale converter to optimize current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature sensor is used to control current, then temperature-induced current variations can be controlled, but device complexity increases
Solution Approach 1:
The pixel array performs self-diagnosis by sensing its own electrical states to predict temperature and control current. Each pixel senses its drain-source voltage and gate voltage, calculates mobility, and determines temperature without external sensors, enabling the system to self-regulate and eliminate the need for separate temperature sensing components
Solution Approach 2:
The patent replaces the physical temperature sensor with an electrical sensing mechanism. By measuring electrical parameters (drain-source voltage, gate voltage) and calculating mobility through electrical characteristics, the system substitutes the mechanical/physical temperature measurement approach with an electrical field-based approach, achieving temperature prediction without thermal sensors
2Reliability
If temperature control is implemented, then image quality deterioration can be prevented, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into the pixel array itself: temperature sensing, mobility calculation, temperature prediction, and current control are all integrated within the pixel circuit. By combining these functions that were previously separate (requiring external sensors and control circuits), the system reduces overall manufacturing complexity while maintaining image quality stability
Solution Approach 2:
The pixel array serves multiple purposes simultaneously: it displays images, senses its own electrical states, calculates mobility, predicts temperature, and controls current. This multi-functionality eliminates the need for dedicated temperature control hardware, simplifying manufacturing while ensuring reliable image quality through integrated temperature compensation
Data Source
AI summary
A display device includes: pixels that receive data voltages corresponding to output grayscales; a sensing circuit that senses electrical states of the pixels to provide sensing information; and a grayscale converter that generates the output grayscales with respect to the pixels based on input grayscales and the sensing information, wherein the grayscale converter predicts a temperature of at least one of the pixels based on the sensing information, calculates a current control amount for the at least one of the pixels based on the predicted temperature and the input grayscales, and calculates the output grayscales for the at least one of the pixels based on the current control amount and the input grayscales.