Dynamic Gate Voltage Control for Display Panel Aging Compensation
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Solution Overview
Problem
Display quality deteriorates due to transistor characteristics being affected by operation time, temperature, voltage, brightness, and other factors in existing display apparatus.
Innovation Solution
A display apparatus that includes a gate driver generating gate signals using gate-on and gate-off voltages, a data driver providing data voltages, a timing controller controlling the operation timing of drivers, a voltage generator producing these voltages, and a timer measuring operation time, with the timing controller adjusting voltage levels based on operation time, temperature, and brightness to compensate for transistor deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate-on voltage is increased to compensate for transistor deterioration, then display quality is improved, but power consumption increases
Solution Approach 1:
The gate-on voltage is dynamically adjusted based on the measured operation time of the display apparatus. The voltage generator receives operation time information from the timer and modifies the gate-on voltage level accordingly, transitioning from a static voltage approach to a dynamic one that adapts to aging effects while optimizing power consumption.
Solution Approach 2:
The system changes the voltage parameter (gate-on voltage) as a function of operation time to compensate for transistor characteristic deterioration. By modifying this key electrical parameter based on accumulated usage, the system maintains display quality without requiring excessive voltage increases that would consume more power.
2Duration of action of moving object
If operation time is extended, then display apparatus usage is improved, but transistor characteristics deteriorate
Solution Approach 1:
The timer continuously measures the operation time and provides feedback to the voltage generator. This feedback loop enables the system to monitor its own usage duration and automatically adjust the gate-on voltage to compensate for the cumulative effects of operation on transistor characteristics.
Solution Approach 2:
The system performs preliminary compensation by adjusting the gate-on voltage before significant display quality deterioration occurs. By proactively modifying the voltage based on operation time, the system prevents transistor characteristic degradation from affecting performance rather than reacting after damage occurs.
3Productivity
If gate-on voltage level is increased to maintain charging rate, then pixel charging is improved, but voltage stability becomes difficult to maintain
Solution Approach 1:
Instead of using a fixed high voltage to maintain charging rate, the system changes the voltage parameter dynamically based on operation time. This allows the gate-on voltage to be optimized for each operational stage, maintaining adequate charging rates while avoiding the instability associated with consistently high voltage levels.
Data Source
AI summary
A display apparatus includes a display panel including a plurality of pixels, a gate driver generating a plurality of gate signals using a gate-on voltage and a gate-off voltage and providing the gate signals to the pixels, a data driver providing data voltages to the pixels, a timing controller controlling an operation timing of the gate driver and the data driver, a voltage generator providing the gate-on voltage and the gate-off voltage to the gate driver, and a timer measuring an operation time and providing the measured operation time to the timing controller. The timing controller controls the voltage generator such that a level of the gate-on voltage is controlled depending on the operation time and the level of the gate-on voltage is controlled depending on a magnitude of the gate-on voltage in a different way from a way to control depending on the operation time and the temperature.