Backlight Module with Adjustable Resistances for Color Temperature Control
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Solution Overview
Problem
Liquid crystal panels with RGBW pixel arrangements face significant color temperature and white dot coordinate drifts due to differences in color temperature and white rendering between RGB resist colors and transparent filling materials, leading to substandard color expression and large color temperature variations.
Innovation Solution
A backlight module with a light guide plate, LED light bar, and adjustable resistances, where LED lamps of different color temperatures are alternately aligned and coupled in series with adjustable resistances to form a driving circuit, allowing for precise adjustment of color temperature and white dot color coordinates through resistance value adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RGBW pixel arrangement with transparent filling material OC is used, then the liquid crystal panel can display white effect through OC+backlight, but the color temperature and white dot color coordinate drift significantly from design values
Solution Approach 1:
The backlight unit is divided into multiple light emitting regions with different color temperatures (first light emitting region with 6504K, second light emitting region with 7500K, third light emitting region with 9300K). This segmentation allows independent control of different color temperature components, enabling precise adjustment of the overall color temperature and white dot color coordinate to match design values.
Solution Approach 2:
Different regions of the backlight unit are assigned different color temperatures to address the local quality differences in the display panel. The first, second, and third light emitting regions provide different color temperatures to compensate for the variations caused by different pixel arrangements (RGB vs. OC), achieving uniform and accurate color temperature across the entire display.
2Device complexity
If single color temperature LED backlight is used, then the structure is simple, but the color temperature uniformity across different pixel arrangements cannot be achieved
Solution Approach 1:
The backlight unit is segmented into multiple light emitting regions with different color temperatures (6504K, 7500K, 9300K) that can be independently controlled. This segmentation enables precise adjustment of color temperature distribution to achieve consistent color temperature across different pixel arrangements without significantly increasing structural complexity.
Solution Approach 2:
The backlight unit uses a composite structure combining multiple LED types with different color temperatures in a single integrated unit. This composite approach allows the system to achieve color temperature consistency across different pixel arrangements by combining the effects of different LED regions, maintaining relatively simple overall structure while improving color temperature stability.
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
Enables accurate and precise control of color temperature and white dot color coordinates in liquid crystal displays by fine-tuning the driving current of LED lamps, ensuring consistent and high-quality color expression.
Implementation Method 1
LED lamps of at least two different color temperatures, which are aligned in spaces
Implementation Method 2
The first LED lamps and the second LED lamps are coated with phosphors of the same thickness and different concentrations or the same concentration and different thicknesses
Data Source
AI summary
The present invention provides a backlight module, a liquid crystal display device and a backlight adjustment method thereof; the backlight module comprises a light guide plate and a LED light bar located at an incident side of the light guide plate, and the LED light bar comprises a driving chip, LED lamps of at least two different color temperatures, which are alternately aligned, and the LED lamps of the same color temperature are coupled in series to construct a route, and each route is coupled to an adjustable resistance in series, and the routes constructed by the LED lamps after parallel connection are all coupled to the driving chip to construct a driving circuit, and the backlight module further comprises a control module, and the control module is coupled to the driving circuit.