LED Video Wall Subframe Driving for Uniform Brightness
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Solution Overview
Problem
Image display apparatuses using light emitting diode panels experience luminance non-uniformity and crosstalk due to differences in the number of simultaneously driven light emitting diodes between adjacent areas, particularly when using a passive-matrix driving scheme.
Innovation Solution
The apparatus includes a driving controller that divides subframe periods into group periods and separately drives light emitting diodes based on the gray level differences between adjacent areas, adjusting the number of driven diodes during these periods to reduce luminance non-uniformity and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive-matrix driving scheme is used to drive light emitting diode panel, then device complexity is reduced, but luminance non-uniformity increases
Solution Approach 1:
The patent divides the display panel into multiple regions (first region and second region) with different driving strategies. The first region uses conventional passive-matrix driving while the second region implements segmented driving with multiple subframes, allowing independent control of light emitting diodes in different areas to compensate for luminance non-uniformity.
Solution Approach 2:
The patent applies different driving methods to different regions of the display panel. The first region uses standard passive-matrix driving, while the second region uses segmented driving with multiple subframes and adjusted data signals, creating local quality differences to compensate for position-dependent luminance variations.
2Adaptability or versatility
If number of simultaneously driven light emitting diodes varies between adjacent areas, then image display flexibility is improved, but crosstalk increases
Solution Approach 1:
The patent applies preliminary action by adjusting the data signal timing and duration before the actual light emitting diode activation. In the second region, data signals are applied during multiple subframes with adjusted timing, preparing the driving conditions to minimize crosstalk while maintaining display flexibility.
Solution Approach 2:
The patent introduces dynamic driving by using multiple subframes (first subframe, second subframe, third subframe) with different data signal configurations. The driving parameters are dynamically adjusted based on the region and temporal period, allowing flexible image display while controlling crosstalk through temporal segmentation.
Data Source
AI summary
The present disclosure relates to an image display apparatus and a video wall including the same. An image display apparatus according to an embodiment of the present disclosure includes: a panel including a plurality of light emitting diodes; and a driving controller configured to output a scan signal for each of a plurality of subframe periods, and output a data signal for displaying an image, to the plurality of light emitting diodes, and the driving controller is configured to divide at least some subframe periods among the plurality of subframe periods into a plurality of group periods, and separately drive the light emitting diodes during at least some periods among the plurality of group periods. Accordingly, luminance non-uniformity between a plurality of light emitting diodes may be reduced.