Voltage Compensator for Scan Driver Gate Voltage Stability
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Solution Overview
Problem
Existing display devices face image quality deterioration due to voltage drops in gate voltages supplied to scan drivers, leading to waveform distortion and gate blocks in the display panel, especially at the upper end portion.
Innovation Solution
Incorporating a voltage compensator connected to the scan driver, which senses the first gate voltage and compensates it with a second gate voltage if it exceeds a reference voltage, maintaining the image quality by ensuring the gate voltage remains within optimal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage compensator is added to sense and compensate gate voltage, then image quality is maintained and gate blocks are prevented, but device complexity increases
Solution Approach 1:
The voltage compensator implements a feedback mechanism by sensing the first gate voltage through a feedback line and comparing it with a reference voltage. When the sensed voltage exceeds the reference, the compensator activates to provide a compensating second gate voltage, thereby maintaining stable operation and preventing image quality deterioration despite the added complexity.
Solution Approach 2:
The voltage compensator serves as an intermediary component between the voltage supply and the scan driver. It mediates the voltage delivery by sensing the actual voltage reaching the scan driver and providing compensation when necessary, ensuring that the scan driver receives appropriate gate voltages without requiring changes to the fundamental system architecture.
2Reliability
If gate voltage is increased to prevent waveform distortion, then scan signal quality improves, but voltage drops and gate blocks occur more frequently in upper portions of the display panel
Solution Approach 1:
The voltage compensator provides localized compensation tailored to specific regions of the display panel. By sensing the gate voltage at different locations and providing region-specific compensation voltages, the system addresses voltage drops locally in upper portions without unnecessarily increasing voltage elsewhere, thereby improving scan signal quality where needed while avoiding the harmful effects of excessive voltage increases.
Solution Approach 2:
The system dynamically changes the gate voltage parameter based on actual conditions. The voltage compensator adjusts the second gate voltage level in response to sensed variations in the first gate voltage, transforming a static voltage supply system into a dynamic one that adapts to prevent waveform distortion and gate blocks without causing voltage drops in other regions.
Data Source
AI summary
A display device includes pixels electrically connected to a plurality of scan lines and a plurality of data lines, respectively, a scan driver that provides a scan signal to each of the plurality of scan lines, a voltage supply that supplies a first gate voltage to the scan driver through a first gate power line, and a voltage compensator. The voltage compensator senses a partial voltage of the first gate voltage applied to the scan driver through a feedback line. The voltage compensator compensates the first gate voltage with a second gate voltage in case that the sensed first gate voltage is greater than a first reference voltage.