Gate Driving Circuit Charge Pump for Stable Display Brightness
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Solution Overview
Problem
Existing gate driving units in display technology face issues with brightness fluctuation due to voltage leakage, which necessitates frequent refreshes to maintain display quality and reduce power consumption, while also being susceptible to noise interference during maintenance phases.
Innovation Solution
A gate driving unit incorporating a first input node control circuit and a charge pump circuit to control and enhance the voltage signal at the first node, ensuring the same polarity and increased absolute value, thereby reducing noise interference and maintaining display quality with reduced refresh frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the refresh frequency is reduced to save power consumption, then power consumption is reduced, but brightness fluctuation due to voltage leakage becomes more prominent
Solution Approach 1:
The patent changes the voltage parameter by introducing a charge pump circuit that generates a pumped voltage signal with higher absolute value than the input voltage signal. This enhanced voltage compensates for voltage leakage over time, allowing reduced refresh frequency while maintaining brightness stability.
2Reliability
If the voltage signal is enhanced to compensate for leakage, then brightness stability is improved, but noise interference during maintenance phase increases
Solution Approach 1:
The patent applies preliminary action by pre-charging the storage node with a strengthened voltage signal before the maintenance phase begins. The charge pump circuit operates during the programming phase to establish the enhanced voltage level, so that when the maintenance phase starts, the voltage is already at the required level, preventing noise interference from affecting the gate driving signal.
3Reliability
If a charge pump circuit is introduced to enhance voltage, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the charge pump circuit with the existing gate driving unit structure, integrating the voltage enhancement functionality into the existing circuit architecture. The charge pump circuit shares timing control signals and operational nodes with the gate driving unit, reducing the overall increase in device complexity while achieving voltage stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces noise interference and maintains display quality by enhancing the voltage signal, allowing for lower refresh frequencies and reduced power consumption.
Implementation Method 1
the charge pump circuit is electrically connected to the first input node, an input clock signal terminal and a first node respectively, and is configured to control to convert a voltage signal of the first input node into a voltage signal of the first node
Data Source
AI summary
A gate driving unit includes a charge pump circuit and an output circuit; the charge pump circuit is connected to a first input node, an input clock signal terminal and a first node; the charge pump circuit is configured to control a voltage signal of the first input node under the control of an input clock signal provided by the input clock signal terminal, the voltage signal of the first input node is written into the first node when the voltage signal of the first input node is a first voltage signal; the output circuit comprises a first output transistor, a control electrode of the first output transistor is connected to the first node, a first electrode of the first output transistor is connected to an output voltage terminal, and a second electrode of the first output transistor is connected to a gate driving signal output terminal.