Light Guide Plate Grooves for Backlight Color Uniformity
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Solution Overview
Problem
Liquid crystal displays using mixed color LEDs as light sources face issues with color irregularity and luminance imbalance due to differences in LED lifespan and color influence, particularly at the corners and sides of the panel, which are exacerbated by the need for a color controller to manage red, green, and blue diodes.
Innovation Solution
A light guide plate with strategically designed grooves adjacent to the LEDs, allowing for controlled light distribution and intensity, combined with alternating magenta and green LEDs to stabilize white light emission without a color controller, ensures uniform luminance and prevents color irregularity by optimizing light path and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If different colors of LEDs are used as light source, then white light can be generated by mixing colors, but color irregularity occurs at corner portions of the liquid crystal panel
Solution Approach 1:
The patent applies local quality by positioning grooves at specific locations on the light guide plate - particularly at corner portions and along light paths from different colored LEDs. These grooves locally modify light extraction characteristics to compensate for the different lifespans and intensities of red, green, and blue LEDs, ensuring uniform color distribution across the display panel.
Solution Approach 2:
The patent changes physical parameters of the light guide plate by introducing grooves with specific depths, widths, and positions. These geometric parameter modifications alter the light extraction efficiency at different locations, allowing compensation for the varying intensities of different colored LEDs over time and preventing color irregularity at corner portions.
2Illumination intensity
If different colors of LEDs are disposed at both ends of the light source, then white light can be generated, but luminance imbalance occurs between left and right sides of the liquid crystal panel
Solution Approach 1:
The patent applies asymmetry by positioning grooves differently on the left and right sides of the light guide plate. The groove patterns are asymmetrically distributed to compensate for the different luminance contributions of LEDs at opposite ends, ensuring balanced luminance across the display panel while maintaining white light generation.
Solution Approach 2:
The patent uses local quality by implementing specific groove configurations at particular locations - with different groove densities, depths, or patterns on left and right sides. This localized modification of light extraction properties balances the luminance output from LEDs positioned at both ends of the light source.
3Illumination intensity
If red, green and blue diodes are mixed to generate white light, then lifespan of red diode is shorter requiring color controller, but device complexity increases
Solution Approach 1:
The patent applies self-service by designing the light guide plate with built-in groove structures that automatically compensate for the different lifespans and intensities of red, green, and blue LEDs. This passive optical compensation eliminates the need for active color controllers or complex electronic balancing systems, reducing device complexity while maintaining uniform white light output.
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
The solution effectively prevents color irregularity and luminance imbalance, reduces the need for a color controller, and stabilizes white light emission, enhancing display uniformity and reducing costs by using magenta and green LEDs in a specific layout.
Implementation Method 1
a light guide plate with strategically designed grooves adjacent to the LEDs, allowing for controlled light distribution and intensity
Implementation Method 2
optimizing light path and intensity
Data Source
AI summary
A backlight assembly includes a first light source unit including n light emitting members; and a light guide plate including a first side adjacent to the first light source unit, and a first groove adjacent to a first end of the first side.