Shift Register Unit Temperature Compensation Circuit
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Solution Overview
Problem
Existing display panel technologies fail to meet design requirements due to performance issues in varying temperature ranges, particularly at low temperatures where turn-on current is decreased, and at high temperatures where leakage current increases, leading to defects in TFT switches.
Innovation Solution
A shift register unit with an input branch and a reset branch, along with a switch circuit, is designed to dynamically control the connection between scan voltage terminals and a pull-up node based on temperature, using auxiliary transistors and a temperature controller to adjust the operation of the shift register unit to compensate for temperature-related performance issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional shift register unit is used without temperature compensation, then the device structure remains simple, but the turn-on current decreases at low temperatures causing defective display
Solution Approach 1:
The shift register unit dynamically switches between different operational modes based on temperature conditions. A switch control circuit selectively connects or disconnects the auxiliary input transistor and auxiliary reset transistor based on temperature detection, allowing the circuit to adapt its structure dynamically. This resolves the contradiction by making the device complexity conditional - simple at normal temperatures, enhanced at low temperatures.
Solution Approach 2:
The invention changes the electrical parameters of the shift register unit by introducing auxiliary transistors that modify the current characteristics. The auxiliary input transistor increases turn-on current at low temperatures, while the auxiliary reset transistor reduces leakage current. These parameter changes are activated only when needed, maintaining reliability across temperature ranges without permanently increasing device complexity.
2Reliability
If auxiliary transistors are added to compensate for low temperature performance, then turn-on current increases at low temperatures, but device complexity increases
Solution Approach 1:
The auxiliary input transistor and auxiliary reset transistor serve multiple functions. The auxiliary input transistor not only increases turn-on current at low temperatures but also works in conjunction with the auxiliary reset transistor to reduce leakage current. The switch control circuit integrates temperature detection and control functions. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity.
3Reliability
If auxiliary transistors are added to reduce leakage current at high temperatures, then leakage current decreases, but power consumption increases due to additional components
Solution Approach 1:
The auxiliary transistors are dynamically activated only when temperature conditions require them. The switch control circuit monitors temperature and selectively enables the auxiliary input transistor and auxiliary reset transistor only during low temperature operation or when leakage current compensation is needed. During normal temperature operation, these auxiliary components remain inactive, avoiding unnecessary power consumption and resolving the contradiction between reliability improvement and energy usage.
Data Source
AI summary
A shift register unit, a driving method thereof, a gate driving circuit, and a display device are provided. The shift register unit includes an input branch and a reset branch; the input branch is configured to form or disconnect a first path between a first scan voltage terminal and a pull-up node under control of a potential of a first control terminal. The reset branch is configured to form or disconnect a second path between a second scan voltage terminal and the pull-up node under control of a potential of a second control terminal.