AMOLED Temperature Compensation via Threshold Voltage Detection
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Solution Overview
Problem
The service life of Active Matrix Organic Light Emitting Diode (AMOLED) panels is shortened due to increased temperature and current, which existing solutions attempt to address by adding a temperature sensor to reduce driving current, increasing production costs.
Innovation Solution
A temperature compensation circuit and method that calculates a compensation gain based on the difference between current and initial threshold voltages of transistors, using predetermined data to adjust the driving circuit without an additional temperature sensor, thereby compensating for temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a temperature sensor is added to the AMOLED panel for temperature compensation, then the service life of the panel is extended, but the production cost increases
Solution Approach 1:
The pixel circuit's transistor automatically provides threshold voltage information that reflects temperature effects. The detection circuit utilizes this inherent electrical characteristic without requiring external temperature sensors, making the system self-diagnostic for temperature compensation purposes
Solution Approach 2:
The detection circuit acts as an intermediary that translates the transistor's threshold voltage into compensation signals for the driving circuit. This intermediary mechanism enables temperature compensation through electrical parameter measurement rather than direct temperature sensing
2Duration of action of stationary object
If the driving current is reduced uniformly to compensate for temperature, then the service life is extended, but the precision of compensation is reduced
Solution Approach 1:
The compensation is applied selectively based on the detected threshold voltage of each pixel circuit's transistor. Rather than uniform reduction, the driving circuit adjusts current locally according to the specific electrical characteristics and temperature conditions of each pixel region
Solution Approach 2:
The detection circuit continuously monitors the transistor's threshold voltage and feeds this information back to the driving circuit. This closed-loop feedback mechanism enables dynamic adjustment of driving current based on real-time temperature conditions, improving compensation precision
Data Source
AI summary
A temperature compensation circuit and method for a display panel and a display panel are provided. The display panel includes a control circuit, a driving circuit, a detection circuit and a pixel circuit; wherein the detection circuit is configured to obtain a current threshold voltage of a transistor of the pixel circuit, the control circuit obtains a current voltage difference between the current threshold voltage and an initial threshold voltage, obtains a current compensation gain matching the current voltage difference according to a predetermined related data of a voltage difference and a compensation gain, and controls the driving circuit to drive the pixel circuit by using the current compensation gain. By practice of the disclosure, the temperature compensation for a display panel could be achieved without the additional temperature sensor, so the service life of the display panel could be extended.