Display Buffer Circuit With Multi-Slope Falling Edge Compensation
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Solution Overview
Problem
In large display systems, the increased length of gate lines leads to equivalent impedance issues, causing voltage differences between pixel electrodes close to and far from the gate driver, resulting in level drift and an inability to simultaneously compensate voltage differences, which affects signal integrity and image display.
Innovation Solution
A buffer system comprising a pull-high module and a pull-low module generates output signals with a rising edge and a falling edge featuring multiple falling portions with different slopes, enhancing the driving ability of scan signals and mitigating the feed-through effect caused by parasitic capacitors, thereby maintaining pulse width and signal consistency across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the gate line length is increased to accommodate larger panel sizes, then the display area is improved, but the equivalent impedance of the gate line increases causing voltage differences between pixel electrodes
Solution Approach 1:
The gate driver is divided into multiple segments (first gate driver and second gate driver) that operate independently to drive different regions of the display panel. Each gate driver has its own gate line, which reduces the equivalent impedance of individual gate lines and minimizes voltage differences between pixel electrodes within each driven region.
2Device complexity
If a single gate driver is used to drive the entire gate line, then the device complexity is reduced, but voltage level drift occurs and simultaneous compensation of voltage differences becomes impossible
Solution Approach 1:
Different gate drivers are designed with different output voltage levels (first gate driver outputs first voltage level, second gate driver outputs second voltage level) to locally compensate for voltage drops in different regions of the display panel. This allows each region to have optimized voltage characteristics suitable for its specific distance from the driver.
3Area of stationary object
If the gate line impedance is increased due to longer lengths, then the driving ability to cover larger areas is improved, but the pulse width is reduced and feed-through effects occur
Solution Approach 1:
By segmenting the gate driver into multiple independent units, each driving a specific region, the pulse width is maintained within each segment without the feed-through effects that occur in long continuous gate lines. The segmented approach allows each gate driver to deliver full-strength pulses to its designated region.
Data Source
AI summary
A buffer generating an output signal and including a pull-high module and a pull-low module is disclosed. The pull-high module makes the output signal to have a rising edge. The pull-low module makes the output signal to have a falling edge. The falling edge includes a plurality of falling portions. A slope of a first falling portion of the falling portions is different from a slope of a second falling portion of the falling portions.