Backlight Module Nonlinear LED Arrangement for Color Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display backlight modules with linearly arranged LEDs often result in non-uniform light mixing, leading to color imbalances and uneven optical performance, as the arrangement of LEDs can produce light that is more yellow or blue instead of pure white.
Innovation Solution
A backlight module design featuring LED units with a red, two green, and a blue LED, where the centers of the red and blue LEDs are positioned on opposite sides of an imaginary line defined by the green LEDs, forming a cross-shaped or rectangular configuration, ensuring uniform light mixing and achieving pure white light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LEDs are arranged linearly in conventional backlight modules, then the structure is simple and easy to manufacture, but the light mixing becomes non-uniform resulting in color imbalance
Solution Approach 1:
The patent applies asymmetry by changing from a linear LED arrangement to a cross-shaped arrangement where red and blue LEDs are positioned on opposite sides of green LEDs. This asymmetric geometric configuration ensures that light from different colored LEDs mixes uniformly across the light guide plate, eliminating the color imbalance (yellow or blue tint) that occurs with linear arrangements while maintaining manufacturing simplicity.
2Device complexity
If LEDs are arranged linearly, then the device complexity is low, but the optical performance deteriorates with non-uniform light mixing
Solution Approach 1:
The cross-shaped LED arrangement uses asymmetric positioning of red and blue LEDs relative to green LEDs to achieve uniform light distribution. This geometric asymmetry ensures that light beams from all LED colors mix evenly across the light guide plate surface, producing pure white light output without the color tints that plague linear arrangements, thereby improving optical performance without significantly increasing device complexity.
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
This configuration ensures uniform mixing of light beams, resulting in improved optical performance and pure white light output, enhancing color balance and overall display quality.
Implementation Method 1
Each LED unit includes a red LED, two green LEDs, and a blue LED. Each LED can emit light beams of the one respective kind of primary color.
Implementation Method 2
a mixing process of the light beams of different colors occurs. The mixing process generally occurs in a space ranging from where the light beams emit from the LEDs to where the light beams reach the light guide plate
Data Source
AI summary
An exemplary backlight module includes a light guide plate, and a light source positioned for illuminating the light guide plate. The light source includes a plurality of LED units, and each LED unit includes a red LED, two green LEDs, and a blue LED. Each red, green, and blue LED has a center. In each LED unit, the centers of the red LED and the blue LED are at two opposite sides respectively of an imaginary line defined between the centers of the green LEDs.