Display Device Load Matching Circuit for Scan Line Uniformity
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Solution Overview
Problem
Display devices face challenges in minimizing load differences between scan lines, leading to variations in pulse width and luminance across pixels, due to the different numbers of pixels connected to each scan line and varying loads applied.
Innovation Solution
The display device incorporates a load matching system with dummy pixels and switch elements connected to a common scan line, along with a load matching driving circuit that controls the turn-on and turn-off of these switch elements to equalize the load across scan lines, ensuring synchronized output of scan and load matching control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensor devices are placed in the non-display area, then the display device can include various sensing functions, but the scan lines have different loads causing pulse width and luminance differences
Solution Approach 1:
The patent introduces a load matching circuit as an intermediary component between the scan lines and the pixels. This circuit includes switching elements that can dynamically adjust the electrical load on each scan line, acting as a mediator to balance the unequal loads caused by the notch configuration and sensor device placement.
Solution Approach 2:
The patent changes the electrical load parameter of scan lines dynamically using the load matching circuit. By adjusting the resistance or capacitance values in the load matching circuit through control signals, the system can compensate for load differences and maintain uniform pulse widths across all scan lines despite the physical asymmetry.
2Adaptability or versatility
If the display area has a notch to accommodate sensor devices, then sensor integration is enabled, but different numbers of pixels are connected to each scan line causing load imbalance
Solution Approach 1:
The load matching circuit serves as an intermediary that compensates for the structural asymmetry introduced by the notch. It provides a uniform electrical interface to all scan lines, masking the underlying physical complexity of unequal pixel connections.
Solution Approach 2:
The load matching circuit introduces dynamic adjustability to the scan line system. The switching elements can be controlled to change the load configuration in real-time, allowing the system to adapt to the asymmetric structure and maintain balanced operation despite the fixed physical layout with the notch.
3Manufacturing precision
If load matching switch elements are added to equalize scan line loads, then luminance consistency is improved, but the device structure becomes more complex
Solution Approach 1:
The load matching circuit is merged with the existing scan driving circuitry. The switching elements are integrated into the scan line architecture, sharing common conductors and control mechanisms with the pixel driving circuits, thereby reducing the overall structural complexity despite adding load balancing functionality.
Solution Approach 2:
The load matching circuit components serve multiple functions: they provide load balancing for uniform luminance, can potentially be used for other scan line compensation purposes, and integrate with the existing pixel driving infrastructure. This multi-functionality justifies the added complexity by providing multiple benefits from a single structural addition.
Data Source
AI summary
A display device includes a display panel including a first display area; a second display area protruding in a first direction from the first display area; and a first non-display area adjacent to a side of the second display area. Each of the first display area and the second display area includes subpixels that display an image and scan lines electrically connected to the subpixels. The first non-display area includes dummy pixels; a common scan line electrically connected to the dummy pixels; load matching switch elements respectively disposed between the scan lines and the common scan line; and a load matching driving circuit that outputs load matching control signals to control turn-on and turn-off of the load matching switch elements.