Backlight Module Asymmetric LED Arrangement for Color Uniformity
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Solution Overview
Problem
Liquid crystal displays (LCDs) using light emitting diodes (LEDs) for backlighting face color shift issues due to non-uniform light mixing from asymmetrical beam patterns of LEDs of different colors.
Innovation Solution
A backlight module with a light guide plate and two lighting elements, each with three LEDs of different colors arranged differently on opposite sides, compensating for each other's asymmetrical beam patterns to provide a uniform light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs of different colors are used to create white backlight, then power consumption is reduced and color rendering is improved, but color shift occurs due to asymmetrical beam patterns
Solution Approach 1:
The patent applies asymmetry by deliberately arranging LEDs of different colors in non-uniform patterns on both sides of the light guide plate. Specifically, the first and second LEDs are positioned at different locations and orientations to compensate for the inherent asymmetrical beam patterns of each LED type, thereby achieving uniform color distribution across the backlight.
Solution Approach 2:
The patent implements local quality by assigning different LED colors to specific locations within the backlight module. Each LED type (red, green, blue) is strategically placed in areas where its specific wavelength contributes most effectively to achieving overall color balance and uniformity across the display surface.
2Illumination intensity
If LEDs of different colors are arranged to produce white light, then color rendering property is improved, but light mixing uniformity deteriorates
Solution Approach 1:
The patent uses asymmetry to counteract the natural asymmetrical beam patterns of individual LEDs. By positioning LEDs of different colors at strategically asymmetric locations and orientations, the patent achieves uniform light mixing across the backlight, transforming the harmful asymmetry into a compensatory mechanism.
Solution Approach 2:
The patent applies parameter changes by adjusting the spatial coordinates, orientations, and color wavelengths of individual LEDs to optimize light mixing. The specific arrangement parameters (positions of first and second LEDs, their respective colors) are tuned to achieve uniform illumination and eliminate color shift across the display surface.
3Device complexity
If asymmetrical beam patterns of LEDs are used, then device complexity is reduced, but color shift problem increases
Solution Approach 1:
The patent embraces asymmetry as a solution rather than a problem. Instead of using symmetric arrangements that would require complex compensation mechanisms, the patent deliberately employs asymmetric LED placements to naturally compensate for beam pattern asymmetries, thereby maintaining structural simplicity while achieving color uniformity.
Solution Approach 2:
The patent converts the harmful effect of asymmetrical beam patterns into a beneficial compensatory mechanism. By strategically positioning LEDs with different beam characteristics at asymmetric locations, the patent allows the asymmetries to cancel each other out, transforming what would be a source of color shift into a means of achieving color balance.
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 arrangement reduces chromatic aberration in the white light produced, ensuring a more stable and uniform hue, thereby minimizing color shift.
Implementation Method 1
a combination of LEDs of different colors can produce the impression of white light as the white backlight source of the LCD
Implementation Method 2
light emitting diodes (LEDs) has the advantages of low power consumption, good color rendering property and mercury-free
Implementation Method 3
The light guide plate has a first side surface and a second side surface opposite the first side surface
Data Source
AI summary
A backlight module includes a light guide plate, at least one first lighting element, and at least one second lighting element. The light guide plate has a first side surface and a second side surface opposite the first side surface. The first lighting element is disposed on the first side surface and has at least three light emitting diodes of different colors. The second lighting element is disposed on the second side surface and has at least three light emitting diodes of different colors. The arrangement of the light emitting diodes of the first lighting element is different from the arrangement of the light emitting diodes of the second lighting element.