Gate Line Drive Circuit Alternating Switching Elements
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Solution Overview
Problem
In liquid crystal display devices, the prolonged application of HIGH voltage to switching elements leads to threshold voltage shift, resulting in noise interference and reduced display performance due to insufficient ON/OFF state maintenance and increased noise application during signal LOW periods.
Innovation Solution
A gate signal line drive circuit with parallel LOW voltage applying switching elements, where one element is turned off and the other is turned on in alternating periods, with delayed transitions to share the HIGH voltage application time and apply reverse bias, thereby suppressing threshold voltage shift and noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single LOW voltage applying switching element is used continuously during signal LOW periods, then the gate signal line can maintain LOW voltage output, but the switching element experiences prolonged HIGH voltage application causing threshold voltage shift and performance degradation
Solution Approach 1:
The patent divides the single LOW voltage applying switching element into two parallel switching elements (first and second switching elements). These elements alternately operate during signal LOW periods, with each element handling portions of the continuous operation duty cycle. This segmentation reduces the cumulative stress on each individual element, suppressing threshold voltage shift and extending operational reliability.
Solution Approach 2:
The patent implements periodic switching between the first and second LOW voltage applying switching elements. During signal LOW periods, the elements are activated alternately in a periodic manner, allowing each element to rest and recover from HIGH voltage stress while the other is active. This periodic action prevents continuous degradation and maintains performance stability over extended operation.
2Productivity
If HIGH voltage is applied to switching elements for extended periods, then the gate signal can be output during signal HIGH periods, but threshold voltage shift occurs leading to noise interference and reduced display performance
Solution Approach 1:
By segmenting the LOW voltage applying function into two parallel switching elements, the patent enables each element to be turned off during signal HIGH periods while the other handles the LOW voltage output. This reduces the duration each element is exposed to HIGH voltage stress, minimizing threshold voltage shift and associated noise interference while maintaining full gate signal output capability.
Solution Approach 2:
The patent changes the operational parameters of the switching elements by implementing alternating activation patterns. Instead of continuous operation, each element operates in pulses with controlled duty cycles, adjusting the time parameters of HIGH voltage exposure. This parameter change suppresses threshold voltage shift and reduces noise interference while preserving productivity.
Data Source
AI summary
A gate signal line drive circuit and a display device which realize the suppression of a threshold voltage of an element which is used for a long time are provided. With respect to elements to which a HIGH voltage is applied for a long time, a plurality of elements are connected parallel to each other and are controlled such that at least any one of the plurality of elements is driven by a switching element, and a period during which the element is not driven is set longer than a frame display period.