Luminance Compensating Part for Large Display Panels
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Solution Overview
Problem
As the size of display panels increases, differences in luminance between areas due to delays in gate signals and data voltages become noticeable, especially when multiple panels are adjacent, leading to uneven display quality, particularly in outdoor applications like billboards.
Innovation Solution
A display apparatus with a luminance compensating part that generates backlight compensating signals with varying values based on the distance between display panel drivers and areas, adjusting the intensity of the backlight unit to compensate for luminance differences, and applying these signals according to operation modes or target luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel size is increased, then the display area is enlarged, but luminance uniformity deteriorates due to signal delay differences
Solution Approach 1:
The patent divides the display panel into multiple regions (first region closer to driver, second region farther from driver) and applies different luminance compensating signals to each region. This local differentiation allows each region to be optimized independently, compensating for the signal delay differences that cause luminance non-uniformity in large displays.
Solution Approach 2:
The patent changes the luminance compensating signal parameter based on the position-dependent signal delay. By calculating different compensating values for different regions and adjusting the backlight intensity accordingly, the system maintains luminance uniformity across the entire large display panel despite varying signal transmission times.
2Area of stationary object
If multiple display panels are disposed adjacent to each other, then the display capacity is increased, but luminance difference between panels becomes visible
Solution Approach 1:
The patent applies different luminance compensating signals to different regions of the display panel. By identifying which regions are closer to or farther from the driver, it creates location-specific compensation that ensures uniform luminance across the entire display area, making adjacent panels appear seamless.
3Illumination intensity
If luminance compensation is applied to all regions, then luminance uniformity is improved, but power consumption increases
Solution Approach 1:
The patent applies luminance compensation selectively rather than uniformly across the entire display. By determining which regions require compensation based on their distance from the driver and only adjusting those specific regions, the system achieves luminance uniformity while minimizing unnecessary power consumption in already-balanced areas.
Data Source
AI summary
A display apparatus includes a display panel configured to display an image. The display panel includes a plurality of display areas. A display panel driver is configured to output a driving signal to the display panel. A backlight unit is configured to provide light to the display panel. A luminance compensating part is configured to generate a backlight compensating signal having different compensating values according to a distance between the display panel driver and the display areas of the display panel.