Gate Signal Line Driving Circuit Voltage Stress Reduction
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Solution Overview
Problem
Conventional gate signal line driving circuits experience degradation and reduced lifetime due to prolonged application of HIGH voltage to switching elements, leading to noise signal mixing and performance degradation.
Innovation Solution
A gate signal line driving circuit design that includes multiple LOW voltage applying switching elements connected in parallel, with at least one element in an ON state and one in an OFF state during the signal LOW period, and a HIGH voltage applying switching element that alternates states, along with control switching elements and a holding capacitor to manage voltage, thereby reducing the duration of HIGH voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single LOW voltage applying switching element is used to output LOW voltage during the signal LOW period, then the circuit structure is simple, but the switching element degrades quickly due to prolonged HIGH voltage application
Solution Approach 1:
The patent divides the single LOW voltage applying switching element into multiple parallel switching elements (first and second switching elements). Each element alternates between ON and OFF states, distributing the duty cycle and reducing the cumulative stress on each individual element. This segmentation allows each switching element to experience HIGH voltage for only a portion of the total time, thereby extending their operational lifetime while maintaining the same overall circuit functionality.
2Stability of the object's composition
If HIGH voltage is continuously applied to switching elements during the signal LOW period, then the LOW voltage output is stable, but noise signals are mixed into the gate signal and performance degrades
Solution Approach 1:
The patent implements periodic switching of the multiple LOW voltage applying switching elements. The first and second switching elements alternately switch between ON and OFF states in a periodic manner. This periodic action ensures that at least one switching element is always in the ON state to maintain stable LOW voltage output, while simultaneously allowing individual elements to rest in the OFF state, preventing noise signal mixing and performance degradation.
3Reliability
If multiple LOW voltage applying switching elements are used in parallel, then switching element lifetime is extended, but the circuit complexity increases
Solution Approach 1:
The patent segments the single switching element function into multiple parallel elements with alternating duty cycles. While this increases the number of components, the segmentation is implemented in a systematic way that distributes stress and extends lifetime.
Solution Approach 2:
The patent uses periodic switching patterns to control the multiple parallel switching elements. This periodic control mechanism coordinates the ON/OFF states of the first and second switching elements, ensuring stable output while managing the increased circuit complexity through predictable, repeating operation cycles.
Data Source
AI summary
A gate signal line driving circuit and a display device which can suppress the degradation of an element attributed to the use of the element for a long time, and can realize the prolongation of lifetime of the element are provided. With respect to elements to which a HIGH voltage is applied for a long time, a plurality of elements are connected in parallel, and at least some of the plurality of elements are driven by switching elements.