Display Panel Block Regions Adjust Activation Voltages for Uniform Kickback
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Solution Overview
Problem
Display devices generate non-uniform kickback voltages at peripheral terminals due to parasitic capacitances with scan and emission lines, leading to uneven image luminance across the display panel.
Innovation Solution
A display device with a display panel divided into block regions, where the activation voltage of emission and scan signals is adjusted based on the distance between block regions to generate substantially uniform kickback voltages at peripheral terminals, using a display panel driver and timing controller to sequentially drive and control the block regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scan signals and emission signals are applied to pixels via scan lines and emission lines, then pixels can be driven to display images, but parasitic capacitances are formed at peripheral terminals causing non-uniform kickback voltages
Solution Approach 1:
The patent applies different activation voltages to emission signals in different block regions based on their positions. Specifically, emission signals for block regions farther from the emission driver are assigned higher activation voltages to compensate for greater voltage drops and parasitic effects, while block regions closer to the driver use lower activation voltages. This local differentiation of signal parameters resolves the kickback voltage non-uniformity problem.
Solution Approach 2:
The patent changes the activation voltage parameter of emission signals according to the spatial position of block regions. By adjusting this electrical parameter based on distance from the emission driver, the system compensates for position-dependent parasitic capacitance effects and voltage drops, achieving uniform kickback voltages across all peripheral terminals regardless of their locations.
2Reliability
If different block regions are driven sequentially with adjusted emission signal voltages, then uniform kickback voltages are achieved, but device complexity increases due to additional control requirements
Solution Approach 1:
The patent divides the display panel into multiple block regions and processes them sequentially rather than simultaneously. The emission driver activates one block region at a time with appropriately adjusted emission signal voltages. This segmentation approach simplifies the control logic compared to managing all block regions at once, while still achieving uniform kickback voltages through the sequential application of position-dependent voltage adjustments.
Solution Approach 2:
The timing controller pre-calculates and prepares the appropriate activation voltages for emission signals based on the known geometric layout and position of each block region. This preliminary determination of voltage parameters allows the emission driver to directly apply the correct voltages without real-time complex calculations, reducing operational complexity while maintaining 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 ensures uniform kickback voltages across the display panel, resulting in consistent image luminance by adjusting the activation voltages of emission and scan signals in the scan direction, thereby equalizing kickback voltages at peripheral terminals.
Implementation Method 1
The scan and emission lines may form parasitic capacitances with peripheral terminals, for example, with terminals of transistors included in the pixels. Thus, kickback voltages may be generated (or, caused) at the peripheral terminals when the scan signal and/or the emission signal are changed.
Data Source
AI summary
A display device is disclosed. In one aspect, the display device includes a display panel including a plurality of pixels divided into a plurality of block regions. The block regions are arranged in a scan direction. The display device also includes a display panel driver configured to sequentially drive the block regions and apply a plurality of first emission signals to the pixels. Each of the first emission signals has an activation voltage. The display device further includes a timing controller configured to control the display panel driver. The display panel driver is further configured to incrementally change the activation voltages of the first emission signals applied to the pixels in each of the block regions in the scan direction.