Backlight Adjustment Method for LCD Brightness Uniformity
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Solution Overview
Problem
Existing backlight adjustment technologies for liquid crystal displays, such as local dimming, often result in obvious bright-dark layering at intersections between high and low brightness backlight blocks, affecting user experience and power consumption.
Innovation Solution
A method and system that calculates the outgoing light brightness of each backlight block based on pixel brightness, divides the backlight source into closed areas with uniform brightness within each area, counts the number of blocks in each area, and looks up corresponding drive currents to ensure uniform actual brightness while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If local dimming is applied to reduce power consumption by adjusting backlight block brightness, then power consumption is reduced, but obvious bright-dark layering occurs at intersections between high and low brightness areas
Solution Approach 1:
The patent changes the control parameter from individual backlight block brightness to the number of backlight blocks activated in each closed area. By looking up drive currents based on block counts rather than adjusting continuous brightness values, the system achieves uniform actual brightness across different areas while reducing power consumption through selective block activation.
Solution Approach 2:
The patent segments the backlight source into multiple closed areas based on image block boundaries. Each closed area is independently controlled by activating a specific number of backlight blocks, creating discrete control zones that eliminate the bright-dark layering effect at transitions between high and low brightness regions.
2Illumination intensity
If backlight blocks are adjusted to match pixel brightness variations, then display contrast is improved, but uniformity of actual brightness across the display is degraded
Solution Approach 1:
The patent changes the control approach from continuous brightness adjustment to discrete block counting. By determining drive currents based on the number of backlight blocks in each closed area rather than their individual brightness values, the system maintains uniform actual brightness while still adapting to image content for contrast improvement.
Solution Approach 2:
The patent uses a preset correspondence table that stores predetermined relationships between the number of backlight blocks and required drive currents. This lookup table approach copies pre-calculated optimal values, ensuring consistent actual brightness across different display scenarios without requiring real-time uniformity calculations.
Data Source
AI summary
The present invention discloses a backlight adjustment method and system, a backlight module and a display device. The backlight adjustment method includes: calculating a first outgoing light brightness of an backlight block corresponding to each image block; dividing a backlight source into a number of closed areas according to the first outgoing light brightnesses of the backlight blocks; calculating the number of backlight blocks included in each of the light-emitting closed areas; looking up a corresponding drive current in a preset correspondence table, wherein predetermined correspondence between the number of backlight blocks and the drive current applied to light up the corresponding number of backlight blocks and make an actual brightness of the corresponding area equal to a preset brightness is recorded in the correspondence table; and outputting the drive current obtained by the lookup operation to the backlight blocks in the light-emitting closed area.