Display Device Gate Voltage Compensation for Transistor Deterioration
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Solution Overview
Problem
Display devices, such as light emitting display devices, face challenges in maintaining the longevity and stability of sub-pixels due to the deterioration of switching, sensing, and driving transistors, which affects their driving capability and reliability.
Innovation Solution
A light emitting display device and method that includes a compensator system to adjust the gate voltage based on sensed voltages from sub-pixels, specifically raising the gate voltage when the driving capability of transistors decreases, utilizing a sensing circuit, voltage controller, power supply, and shift register to compensate for transistor deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate voltage is increased to compensate for transistor deterioration, then driving capability is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gate voltage level based on the sensed deterioration state of the transistor. Instead of using a fixed high gate voltage, the system senses the transistor's driving capability and modifies the gate voltage parameter accordingly, thereby improving reliability only when necessary and reducing unnecessary power consumption.
2Reliability
If sensing circuit is added to detect transistor deterioration, then reliability is improved, but device complexity increases
Solution Approach 1:
The sensing circuit is designed to serve multiple functions: it detects transistor deterioration, provides feedback for gate voltage adjustment, and can potentially monitor other sub-pixel parameters. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby limiting the increase in device complexity while maintaining improved reliability.
3Stability of the object's composition
If gate voltage is continuously adjusted based on sensing voltage, then driving stability is improved, but control complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the sensing voltage from the sub-pixel is continuously monitored and fed back to the gate voltage control circuit. This feedback loop enables automatic adjustment of the gate voltage to maintain optimal driving conditions, improving driving stability while keeping the control complexity manageable through automated closed-loop control.
Data Source
AI summary
A display device includes a display panel including a sub-pixel for displaying an image, a data driver configured to apply a data voltage to a data line of the sub-pixel, and a scan driver configured to apply a gate signal to a gate line of the sub-pixel. A gate voltage of the gate signal is compensated based on a sensing voltage sensed from the sub-pixel.