Scan Driver Pulse Width Control for Uniform Display Charging
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Solution Overview
Problem
In display devices with a single side driving structure, RC load nonuniformity and unsynchronized timings of scan and data signals lead to data charging ratio deviations, degrading display quality.
Innovation Solution
The display device employs multiple scan drivers with adjustable pulse widths controlled by a timing controller to synchronize scan signals across different pixel blocks, reducing RC load deviations and compensating for signal delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single side driving structure is used to reduce bezel size, then the device complexity is reduced, but RC load nonuniformity occurs and scan signal timing synchronization deteriorates
Solution Approach 1:
The display panel is divided into multiple pixel blocks (first pixel block, second pixel block, third pixel block) with each block driven by a dedicated scan driver (first scan driver, second scan driver, third scan driver). This segmentation allows independent timing control for each block, enabling precise compensation of RC load nonuniformity while maintaining the compact single side driving structure.
Solution Approach 2:
Different scan drivers are configured with different pulse widths tailored to the specific RC load characteristics of each pixel block. The first scan driver supplies scan signals with a first pulse width, the second scan driver supplies scan signals with a second pulse width, and the third scan driver supplies scan signals with a third pulse width. This local quality adjustment compensates for timing variations in different regions of the display panel.
2Manufacturing precision
If different pulse widths are applied to different pixel blocks, then signal timing synchronization is improved, but the device complexity increases
Solution Approach 1:
Multiple scan drivers are disposed at the same side of the display panel and merged into a unified single side driving structure. The first scan driver, second scan driver, and third scan driver are all positioned at one side, sharing the same physical space and control architecture, which reduces overall device complexity while enabling different pulse width configurations for each driver.
3Manufacturing precision
If multiple scan drivers with different pulse widths are used, then data charging ratio uniformity is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The scan drivers are designed with universal functionality to supply scan signals to multiple scan lines within their respective pixel blocks. Each scan driver can operate with different pulse width configurations while maintaining the same basic structure and control interface, simplifying the manufacturing process by using standardized components with adjustable parameters rather than completely different driver designs.
Data Source
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AI summary
A display device includes a display panel including scan lines, first signal lines connected to the scan lines in a first pixel block, second signal lines connected to the scan lines in a second pixel block, third signal lines connected to the scan lines in a third pixel block; a first scan driver supplying a first output signal to the first signal lines based on a first sub-clock signal; a second scan driver supplying a second output signal to the second signal lines based on a second sub-clock signal; a third scan driver supplying a third output signal to the third signal lines based on and a third sub-clock signal; and a timing controller. Changes in pulse widths of the first to third output signals are different in one frame period.