Gate Driving Unit with Output Compensation for LCD Panels
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Solution Overview
Problem
The existing Gate On Array (GOA) structure in liquid crystal display (LCD) panels faces challenges in reducing gate voltage drop, leading to inaccurate and asymmetric pixel voltages due to the lack of effective charge sharing methods.
Innovation Solution
A gate driving unit with a driving signal output unit and an output compensation unit is introduced, which includes modules for voltage control and compensation, utilizing transistors and capacitors to manage clock signals and reference voltages, allowing for reduced gate voltage drops and improved pixel voltage accuracy and symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate driving signal potential is reversed after scanning a row of pixel units, then the gate line can be prepared for the next row scanning, but a large gate voltage drop occurs causing large jump voltage in pixel units which degrades pixel voltage accuracy and symmetry
Solution Approach 1:
The patent applies preliminary action by pre-charging the gate line to a high potential level before the gate driving signal reversal occurs. The charging circuit activates in advance to supply charge to the gate line, ensuring that when the potential needs to be reversed for the next row scanning, the voltage drop is minimized because the line is already charged to the appropriate level. This preliminary charging action prevents the harmful gate voltage drop that would otherwise occur during signal reversal.
Solution Approach 2:
The patent changes the voltage parameter of the gate line dynamically by switching between different potential levels. The charging circuit modifies the gate line voltage from a low potential state to a high potential state as needed during the scanning process. This parameter change approach allows the gate line to maintain optimal voltage levels throughout operation, reducing unwanted voltage drops and improving pixel voltage accuracy.
2Object-generated harmful factors
If charge sharing is implemented in the peripheral driver IC circuit, then the gate voltage drop is reduced, but the method is not applicable to the GOA structure requiring additional charge sharing structure design
Solution Approach 1:
The patent implements self-service by designing a charge sharing structure that is integrated within the GOA circuit itself, allowing the circuit to share charges autonomously without requiring external driver IC intervention. The charge sharing is achieved through internal circuit elements (capacitors and transistors) that automatically redistribute charge when needed, making the system self-sufficient and eliminating the need for complex external charge sharing mechanisms.
Solution Approach 2:
The patent merges the charge sharing function with the existing GOA circuit structure by integrating charging circuits and capacitive elements directly into the gate driver circuitry. This combination allows the gate driving and charge sharing functions to work together in a unified structure, reducing overall device complexity compared to having separate charge sharing mechanisms.
3Ease of operation
If a multi level gate function is used to shift rectangular waveform, then the gate driving signal can be provided to the gate line, but the signal reversal causes voltage jumps that affect pixel unit performance
Solution Approach 1:
The patent applies preliminary action by pre-charging the gate line to the appropriate potential level before the signal reversal occurs during multi-level gate operation. This advance charging ensures that when the rectangular waveform needs to be shifted or reversed for different scanning rows, the voltage transitions are smooth and controlled, preventing harmful voltage jumps that would affect pixel unit performance and maintain manufacturing precision.
Data Source
AI summary
The present disclosure relates to a gate driving unit and a driving method thereof, a gate driving circuit and a display device. The gate driving unit used for providing a gate driving signal for a gate line comprises a driving signal output unit and an output compensation unit. The driving signal output unit and the output compensation unit are respectively connected to two input terminals of a load. The output compensation unit is configured to compensate for level jumping of a gate driving signal outputted from the driving signal output unit.