Display Driving Circuit With Thermistor-Based Grayscale Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The temperature increase caused by light-emitting diodes in display devices affects the operation of driving transistors, leading to abnormalities in grayscale values and display screen issues.
Innovation Solution
A display device incorporating multiple driving transistors, a sensing circuit with a thermistor, and a controlling circuit that generates an offset voltage based on reference tables to compensate for temperature fluctuations, adjusting the driving transistors' operation to maintain consistent grayscale values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting diodes are driven to emit light, then illumination intensity is improved, but temperature increases causing driving transistor operation abnormalities
Solution Approach 1:
The patent implements a temperature sensing circuit that continuously monitors the temperature of the driving transistor and feeds this information back to the control circuit. The control circuit then adjusts the driving signal accordingly to compensate for temperature-induced threshold voltage changes, thereby maintaining stable display performance while allowing high-brightness operation.
Solution Approach 2:
The patent changes the operating parameters of the driving transistor dynamically based on temperature conditions. By adjusting the driving voltage or current parameters in response to temperature changes, the system maintains optimal transistor operation across varying temperature ranges, preventing display abnormalities while preserving illumination intensity.
2Stability of the object's composition
If driving transistor operation is adjusted to compensate for temperature, then display stability is improved, but device complexity increases due to additional sensing and control circuits
Solution Approach 1:
The patent merges the temperature sensing function and the driving control function into an integrated circuit structure. The sensing circuit and control circuit are combined with the display pixel circuit, sharing common components and signal paths. This integration reduces the overall device complexity while maintaining the temperature compensation capability and display stability.
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
The solution effectively compensates for temperature-induced variations in driving transistors, preventing anomalies in the display screen by using a thermistor to detect temperature changes and adjusting control signals accordingly.
Implementation Method 1
The sensing circuit includes a thermistor. The sensing circuit is disposed on the substrate. The sensing circuit is configured to generate a sensing voltage based on an input voltage.
Data Source
AI summary
Disclosed is a display device. The display device includes multiple driving transistors, a sensing circuit and a controlling circuit. The controlling circuit is coupled to the driving transistors and the sensing circuit arranged on a substrate. The driving circuits drives multiple light-emitting elements. The sensing circuits includes a thermistor. The sensing circuit generates a sensing voltage according to an input voltage. The controlling circuit generates an offset voltage according to the sensing voltage, based on multiple reference tables regarding resistance, temperature and threshold voltage of each of the driving transistors, and drives the driving transistors according to the offset voltage. Thereby, abnormalities of a display screen caused by temperature change May be avoided.