Display Device Dummy Pixel Row Synchronization
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Solution Overview
Problem
In display devices, differences in the number or duration of off-periods of emission signals between pixel rows can lead to horizontal lines and degrade image quality.
Innovation Solution
Incorporating a dummy pixel row with synchronized off-periods and adjusting the widths of off-periods in emission signals to maintain consistent load across all pixel rows, thereby preventing image quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If emission signals are provided to pixel rows with different numbers of off-periods, then the display device can operate with simplified driving control, but horizontal lines are generated and image quality is degraded
Solution Approach 1:
A dummy pixel row is introduced as an intermediary element between actual pixel rows. This dummy row receives emission signals synchronized with specific pixel rows (k*nth rows) to balance the load during off-periods, preventing horizontal lines while maintaining the simplified driving control structure. The dummy pixel row acts as a buffer that absorbs the imbalance caused by varying off-period counts across different pixel rows.
Solution Approach 2:
The emission signals are differentiated by local row characteristics. Pixel rows are divided into groups where k*nth rows receive signals with different off-period configurations compared to other rows. The dummy pixel row is specifically configured to match the off-period timing of k*nth rows, creating localized quality adjustments that prevent visual artifacts while maintaining overall system simplicity.
2Device complexity
If the number of off-periods varies between pixel rows, then the emission driver can be simplified, but horizontal lines are generated degrading image quality
Solution Approach 1:
The dummy pixel row serves as a mediator that balances the load imbalance caused by varying off-period counts. By synchronizing the dummy row's emission signals with k*nth pixel rows, the system maintains reliable and consistent image quality across all rows while keeping the emission driver structure simplified.
Solution Approach 2:
The dummy pixel row acts as a counterweight to compensate for the load imbalance in k*nth pixel rows. When k*nth rows have fewer off-periods, the dummy row adds corresponding off-periods to balance the overall load, ensuring consistent image quality and preventing horizontal line artifacts.
3Manufacturing precision
If emission signals with different off-period widths are provided to different pixel rows, then image quality can be optimized for specific rows, but horizontal lines may be generated
Solution Approach 1:
The dummy pixel row mediates the synchronization between pixel rows with different off-period widths. By configuring the dummy row to match the off-period timing of k*nth rows, the system optimizes image quality for specific rows while preventing horizontal lines through proper load balancing, without requiring complex signal synchronization across all rows.
Data Source
AI summary
A display device includes a display panel including first to (m*n−1)th pixel rows and a dummy pixel row, where each of m and n is a natural number greater than or equal to 2, an emission driver which provides emission signals to the first to (m*n−1)th pixel rows and the dummy pixel row, and a timing controller which provides an emission start signal and a dummy start signal to the emission driver. Each of the emission signals includes a plurality of on-periods and a plurality of off-periods in one frame period, and time points of off-periods of an emission signal provided to the dummy pixel row are the same as time points of off-periods of an emission signal provided to each of k*nth pixel rows, where k is a natural number greater than or equal to 1 and less than m.