Gate Driver Circuit Modulated Voltage for Large Display Panels
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Solution Overview
Problem
As display panels grow in size, the increased loads on scan lines lead to decreased output levels of gate signals, impacting display quality due to power modulation and pre-charge techniques, which compromise both pre-charge effect and write speed into storage capacitors.
Innovation Solution
A gate driving circuit with M groups of gate channels, each including a control circuit and an output buffer, modulates the power supply voltage to maintain driving pulse shape during the pre-charge period, ensuring consistent gate signal levels and independent voltage generation for each group, allowing adjustment of the pre-charge period based on the number of scan lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If power modulation techniques are used to compensate for heavy loads on scan lines in large display panels, then the gate driver can drive larger displays, but the output level of gate signals decreases, impacting display quality
Solution Approach 1:
The gate driver circuit is divided into M groups of gate channels, with each group having independent control circuits that generate modulated supply voltages. This segmentation allows different portions of the display to be driven with optimized voltage levels, maintaining signal strength even in large displays.
Solution Approach 2:
The control circuits modulate the power supply voltage dynamically, changing voltage parameters based on the driving period and pre-charge period requirements. This enables the gate driver to maintain appropriate output levels across different display sizes and operating conditions.
2Reliability
If pre-charge techniques such as increasing the pulse width of gate signals are used, then the pre-charge effect is enhanced, but the write speed of data into storage capacitors decreases
Solution Approach 1:
The gate driver operates with periodic modulation of the supply voltage, creating distinct driving periods and pre-charge periods. This periodic action allows the circuit to optimize for pre-charge during specific time windows while maintaining fast write speeds during data writing periods.
Solution Approach 2:
The control circuits dynamically adjust the supply voltage waveform, shaping it differently during driving periods versus pre-charge periods. This dynamic control enables the system to maintain both strong pre-charge effects and fast write speeds by adapting the voltage profile to the current operational phase.
Data Source
AI summary
A gate driver, a display apparatus having the same, and a gate driving method are provided. The display apparatus includes a plurality of pixels, a data driver circuit, and a gate driver circuit. The gate driver circuit includes M groups of gate channels. Each of the M groups of gate channels includes a control circuit and an output buffer. The control circuit receives a power supply voltage from a power supply circuit and generates a modulated supply voltage. The output buffer is connected to the control circuit, the output buffer is powered by the modulated supply voltage to output a gate signal to a gate line of the display panel, wherein a driving pulse of the gate signal is shaped during a charge period according to the modulated supply voltage, and the shape of the driving pulse of the gate signal is maintained during a pre-charge period.