Gate Driving Circuit Voltage Stabilization for Display Devices
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Solution Overview
Problem
In display devices, the threshold voltage variation of transistors in gate driving circuits over time can cause unintended turning-on, affecting gate signal voltage levels, leading to reliability issues, especially at elevated operating temperatures.
Innovation Solution
A display device with a voltage generation circuit that adjusts the third driving voltage based on the difference between the signal from the gate driving circuit and a reference voltage, using a comparator circuit, look-up table, and voltage generator to output different voltage levels, thereby stabilizing the voltage and enhancing the reliability of the gate driving circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistors are operated for extended period at elevated temperature, then device functionality is maintained, but threshold voltage varies causing unintended turning-on and gate signal voltage level changes
Solution Approach 1:
The patent implements a feedback mechanism where the voltage generation circuit continuously monitors the gate signal voltage level and adjusts the third driving voltage accordingly. When threshold voltage variation causes unintended transistor turning-on and gate signal voltage level changes, the feedback loop detects this deviation and compensates by adjusting the driving voltage to restore proper signal levels, thereby maintaining circuit reliability under elevated temperature conditions
Solution Approach 2:
The patent dynamically changes the voltage parameter (third driving voltage) in response to threshold voltage variations. The voltage generation circuit adjusts the magnitude of the third driving voltage based on detected threshold voltage changes, allowing the system to adapt to temperature-induced parameter drift and prevent malfunction caused by unintended transistor turning-on
2Reliability
If voltage levels are stabilized to prevent unintended transistor turning-on, then reliability improves, but additional voltage generation and control circuits are required
Solution Approach 1:
The voltage generation circuit is designed to perform multiple functions: it generates the third driving voltage for transistor operation, monitors gate signal voltage levels for threshold voltage variation detection, and dynamically adjusts voltage levels for compensation. By integrating these functions into a single multi-functional circuit, the patent achieves improved reliability without proportionally increasing overall device complexity
Solution Approach 2:
The patent combines the voltage generation function with the threshold voltage variation detection and compensation functions into an integrated voltage generation circuit. This merging of functions allows the circuit to automatically adjust driving voltages based on real-time threshold voltage monitoring, achieving reliable operation without requiring separate independent circuits for each function
Data Source
AI summary
A display device includes a voltage generation circuit that generates a plurality of clock signals and a first driving voltage, a second driving voltage, and a third driving voltage. A gate driving circuit receives the generated clock signals and the first driving voltage, the second driving voltage, and the third driving voltage, and includes a plurality of driving stages each of which outputs a carry signal and a gate signal to a corresponding gate line among gate lines. The voltage generation circuit sets a voltage level of the third driving voltage based on a signal of a first node of at least one of the driving stages.