Display Device Scan Signal Timing Control
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Solution Overview
Problem
Display devices experience brightness deviation among pixels due to varying loads on driving wiring lines, leading to inconsistent image display.
Innovation Solution
A display device design that includes signal delay circuits and transistors to control the timing of scan signals across different pixel regions, ensuring synchronized operation by delaying signals to match the time constants of scan lines with different loads, thereby reducing brightness differences between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If different pixel regions are driven by the same scan signal timing, then device complexity is reduced, but brightness uniformity deteriorates due to varying loads on scan lines of different lengths
Solution Approach 1:
The pixel array is divided into multiple pixel regions (first pixel region, second pixel region, third pixel region) with different widths, and each region is driven by a dedicated scan driver (first scan driver, second scan driver, third scan driver). This segmentation allows each scan driver to be optimized for its specific region's load characteristics, resolving the brightness uniformity issue while maintaining manageable device complexity through modular architecture.
Solution Approach 2:
Each scan driver is configured with specific signal delay characteristics matched to its pixel region's load. The first scan driver handles the widest region with highest load, the second scan driver handles the intermediate region, and the third scan driver handles the narrowest region with lowest load. This local optimization ensures each region receives appropriately timed scan signals for uniform brightness.
2Illumination intensity
If scan lines are made shorter to reduce load, then brightness uniformity improves, but the display area is reduced
Solution Approach 1:
Instead of uniformly shortening all scan lines, the display is segmented into multiple pixel regions with scan lines of appropriate lengths for each region. The first pixel region has longer scan lines to cover wider area, while the second and third pixel regions have progressively shorter scan lines. This segmentation maintains brightness uniformity in each region while maximizing the total display area.
Solution Approach 2:
The problem is solved by adding the dimension of spatial segmentation across the display width. Rather than uniformly adjusting scan line parameters, the display is divided into regions along the horizontal dimension, with each region's scan lines optimized for that specific spatial zone's requirements, thereby maximizing overall display area while maintaining local brightness uniformity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively minimizes brightness deviations among pixels by synchronizing scan signals across regions with varying loads, resulting in a more uniform and consistent image display.
Implementation Method 1
a signal delay circuit connected to the first signal line to delay the first driving signal
Data Source
AI summary
A display device includes first pixels in a first pixel region and connected to first scan lines and second pixels in a second pixel region connected to second scan lines. The second pixel has a width less than the first pixel region. The display device also includes a first scan driver to supply first scan signals to the first scan lines, a second scan driver to supply second scan signals to the second scan lines, a first signal line to supply a first driving signal to the first scan driver and the second scan driver, and a signal delay circuit connected to the first signal line to delay the first driving signal.