Gate Driver Transistor Mix for Stable Display Signals in Humidity
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Solution Overview
Problem
The degradation of circuit elements in gate drivers due to high temperature or high humidity environments leads to output abnormalities of gate signals, affecting the stability and reliability of display devices.
Innovation Solution
Incorporating transistors with different characteristics in the gate driver, including at least one first and second transistor with distinct properties, and using an oxide semiconductor layer that can be repeatedly turned on and off to prevent threshold voltage shift, ensuring stable operation in challenging environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gate driver operates in high temperature or high humidity environments, then the display device can function in challenging conditions, but the circuit elements degrade leading to output abnormalities
Solution Approach 1:
The patent applies local quality by using different transistor types in different locations within the gate driver circuit. Specifically, oxide semiconductor transistors are used in circuits requiring high stability (such as shift register circuits), while other transistor types are used in other locations. This localized differentiation allows the gate driver to maintain reliable operation in high temperature and high humidity environments by placing the most environmentally stable transistors in the most critical circuit positions.
2Duration of action of stationary object
If the gate driver operates for extended periods, then continuous display operation is achieved, but circuit elements degrade causing output abnormalities
Solution Approach 1:
The patent applies parameter changes by utilizing the unique electrical characteristics of oxide semiconductor transistors, which maintain stable threshold voltages even after prolonged operation. These transistors exhibit minimal threshold voltage shift and maintain consistent electrical parameters over extended periods, enabling the gate driver to operate continuously without degradation-induced output abnormalities.
3Ease of manufacture
If transistors with uniform characteristics are used, then manufacturing simplicity is maintained, but threshold voltage shift occurs in high temperature or high humidity environments
Solution Approach 1:
The patent implements local quality by selectively using oxide semiconductor transistors in specific circuit locations where threshold voltage stability is critical, while using other transistor types in other locations. This approach maintains manufacturing simplicity for the majority of transistors while providing enhanced reliability in key positions through the specialized oxide semiconductor transistors that are resistant to threshold voltage shift in high temperature and high humidity environments.
Data Source
AI summary
A display device may include: a display panel including a display area in which a plurality of pixels are disposed, and a non-display area disposed around the display area; and a gate driver configured to receive a start signal and a clock signal and to supply a gate signal to the display panel. Each of the plurality of pixels may include at least one first transistor and at least one second transistor having characteristics different from characteristics of the at least one first transistor. The gate driver may include at least one third transistor and at least one fourth transistor having characteristics different from characteristics of the at least one third transistor.