Display Panel Scan Line Driving Method for Brightness Uniformity
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Solution Overview
Problem
Display devices with non-traditional rectangular screens face uneven brightness due to differences in scan line lengths and the number of sub-pixels connected, leading to unequal RC loadings and charging times for liquid crystal capacitors.
Innovation Solution
A driving method and display device configuration that adjusts the pulse widths of enable periods for scan lines of varying lengths to ensure even power distribution, using a processor and controller to generate image and data enable signals, and adjust gate control signals to synchronize data and active voltages across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If scan lines of different lengths are used to accommodate non-rectangular screen shapes, then screen shape flexibility is improved, but brightness uniformity deteriorates
Solution Approach 1:
The patent applies local quality by adjusting the enable period width according to the specific characteristics of each scan line. Shorter scan lines are assigned longer enable periods while longer scan lines receive shorter enable periods, creating localized parameter adjustments that compensate for the different RC loadings caused by varying scan line lengths, thus maintaining brightness uniformity across different screen regions
Solution Approach 2:
The patent changes the temporal parameter (enable period width) of the gate control signal to compensate for structural differences in scan lines. By dynamically adjusting the enable period width based on scan line length, the system compensates for the different charging characteristics of liquid crystal capacitors connected to scan lines of varying lengths, thereby resolving the brightness uniformity issue while maintaining screen shape flexibility
2Area of stationary object
If scan lines connect to different numbers of sub-pixels, then screen area coverage is improved, but RC loading uniformity deteriorates
Solution Approach 1:
The patent changes the enable period width parameter in the gate control signal to compensate for different RC loadings. Scan lines connecting to fewer sub-pixels (shorter scan lines) are assigned longer enable periods, while scan lines connecting to more sub-pixels (longer scan lines) are assigned shorter enable periods, ensuring uniform charging characteristics across all scan lines despite varying screen area coverage
3Device complexity
If identical input power is applied to scan lines of different lengths, then power distribution simplicity is improved, but charging time uniformity deteriorates
Solution Approach 1:
The patent applies local quality by assigning different enable period widths to scan lines based on their individual characteristics. Instead of using a uniform power distribution approach, the system locally adjusts the enable period width for each scan line group, providing longer enable periods to shorter scan lines and shorter enable periods to longer scan lines, thereby achieving uniform charging times across all scan lines
Solution Approach 2:
The patent uses periodic gate control signals with varying enable period widths to control the charging of liquid crystal capacitors. By implementing periodic scanning with adjusted enable periods for different scan lines, the system ensures that all capacitors are fully charged before the next frame, maintaining charging time uniformity while preserving the simplicity of power distribution architecture
Data Source
AI summary
A driving method of display device configured to be applied to a display device capable of reducing the difference in brightness between areas with different widths of a display panel includes: receiving an input signal by a processor to generate an image signal and an original data enable signal, with the image signal and the original data enable signal configured to control the display panel; and generating a gate control signal and a transmission signal by the controller based on the image signal and the original data enable signal for a scan line driver and a data line driver respectively. The gate control signal comprises a plurality of enable periods for activating the plurality of scan lines respectively, and widths of the enable periods for activating scan lines with different lengths are different. Said display device and a display driving circuit are also disclosed.