LCD Local Dimming Area Division Residual Pixel Distribution
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Solution Overview
Problem
The existing LCD devices face errors and luminance deviations due to mismatched numbers of local dimming blocks and data analysis areas, leading to image quality degradation, especially when the number of local dimming blocks is not a factor of the resolution divided by the number of backlight driving ports, resulting in residual pixels that cannot be equally distributed.
Innovation Solution
A method for dividing the display area by determining the initial number of pixels per data analysis area and calculating residual pixels, then distributing these residual pixels uniformly across data analysis areas to minimize errors between local dimming blocks and data analysis areas, ensuring each data analysis area receives an appropriate number of pixels to maintain consistent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of local dimming blocks is set to be a number other than any factor of resolution/number of backlight driving ports, then the backlight unit can be slimmed down or fabrication cost can be reduced, but residual pixels cannot be equally distributed to local dimming blocks, causing luminance deviation and image quality degradation
Solution Approach 1:
The patent applies local quality by distributing residual pixels non-uniformly across different local dimming blocks. Specifically, some blocks receive (initial pixels + 1) while others receive only initial pixels, creating localized variations in pixel count that compensate for the overall non-factor relationship. This ensures each block has approximately equal pixel distribution while allowing the total block count to be independent of resolution factors.
2Manufacturing precision
If the number of local dimming blocks is set to be a factor of resolution/number of backlight driving ports, then pixel distribution is uniform, but the backlight unit cannot be slimmed down and fabrication cost increases
Solution Approach 1:
The patent changes the parameter of block pixel composition by introducing residual pixel distribution. Instead of requiring uniform pixel counts across all blocks (traditional approach), the system allows blocks to have (initial pixels) or (initial pixels + 1) pixels, changing the parameter from strict uniformity to approximate uniformity. This enables flexible block counts that are not constrained to be factors of resolution.
3Device complexity
If residual pixels are concentrated in one local dimming block, then distribution calculation is simplified, but luminance deviation increases and image quality degrades
Solution Approach 1:
The patent segments the residual pixels and distributes them across multiple local dimming blocks rather than concentrating them in one block. Each block that receives a residual pixel becomes a separate segment with (initial pixels + 1) count, while others remain at initial pixels. This segmentation approach maintains relatively simple calculation logic while ensuring luminance consistency across the display.
Data Source
AI summary
A method for dividing a display area for local dimming of LCD is disclosed. The method includes determining an initial number of pixels per data analysis area and a total number of residual pixels, calculating a first residual pixel sum of a current data analysis area using the total number of residual pixels and a second residual pixel sum of a previous data analysis area, determining whether to assign a residual pixel to the current data analysis area using the first residual pixel sum and the total number of data analysis areas, calculating a second residual sum of the current data analysis area whether to assign a residual pixel, and repeating the calculation above until the data analysis area index is a last data analysis area index.