Display Device Adjusting Data Signal Slew Rate for RC Load Compensation
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Solution Overview
Problem
In single side driving type display devices, non-uniform RC loads along scan lines lead to desynchronization of scan and data signals, resulting in varying data charging rates and deteriorated display quality due to differences in signal timing and slew rates across pixels.
Innovation Solution
A display device with a controller that adjusts the slew rate and output timing of data signals based on the load of scan and data lines, using over-driving pulses and bias voltage adjustments to synchronize signal delivery across pixels, thereby compensating for varying RC loads along scan lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a single side driving type structure is used to implement narrow bezel, then the bezel width is reduced, but non-uniform RC loads cause desynchronization of scan and data signals
Solution Approach 1:
The patent applies local quality by adjusting the slew rate of data signals differently based on the position of scan lines. Each scan line position receives customized slew rate compensation to account for varying RC loads, ensuring uniform signal charging across the display panel while maintaining the narrow bezel structure.
2Area of stationary object
If scan lines have different lengths due to structure, then the display area is maximized, but data charging rates become non-uniform
Solution Approach 1:
The patent changes the slew rate parameter of data signals dynamically based on scan line position. By adjusting this electrical parameter, the system compensates for the physical variation in scan line lengths and RC loads, achieving uniform data charging rates across all pixel rows while preserving the maximized display area.
3Speed
If slew rate is increased to compensate for heavy load, then data charging speed improves, but power consumption increases
Solution Approach 1:
The patent applies local quality by adjusting the slew rate of data signals differently based on the position of scan lines. Each scan line position receives customized slew rate compensation to account for varying RC loads, ensuring uniform signal charging across the display panel while maintaining the narrow bezel structure.
Solution Approach 2:
The patent dynamically adjusts the slew rate based on the actual load conditions of each scan line position. This dynamic adaptation allows the system to optimize between charging speed and power consumption by applying higher slew rates only where needed, rather than uniformly across the entire display.
Data Source
AI summary
A display device includes a pixel unit including pixels connected to data lines and scan lines; a data driver disposed on one side of the pixel unit; a scan driver disposed on the one side of the pixel unit together with the data driver; and a controller which controls a slew rate and output timing of data signals output to the data lines based on a load of the scan lines and a load of the data lines. Each of the scan lines includes a main scan line extending in a first direction and connected to pixels in a corresponding pixel row; a first sub-scan line extending in a second direction and connected to the main scan line at a first contact point; and a second sub-scan line extending in the second direction and connected to the main scan line at a second contact point.