Zigzag LED Matrix for LCD Backlight Uniformity
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Solution Overview
Problem
Existing plane light sources for LCD backlight units require a large number of light emitting devices to achieve uniform brightness, leading to inefficiencies in size, weight, and manufacturing costs, with reduced luminance and increased pitch between devices causing variations in brightness distribution.
Innovation Solution
A plane light source with optimized arrangement and pitch of light emitting devices in a zigzag matrix configuration, where each device forms angles between 45° and 55°, and pitches between 25mm and 38mm, reducing the number of devices by approximately 50% while maintaining uniform luminance distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large number of light emitting devices are arranged to cover the light emitting area, then uniform brightness can be achieved, but the number of devices increases leading to higher manufacturing costs and reduced efficiency
Solution Approach 1:
The patent applies local quality by differentiating the arrangement density of light emitting devices across different regions. The first light emitting devices are arranged with a first pitch while the second light emitting devices are arranged with a second pitch, creating localized variations in device density to optimize both uniformity and quantity reduction.
Solution Approach 2:
The patent segments the light emitting devices into two distinct groups: first light emitting devices and second light emitting devices. Each group is arranged with different pitches, allowing independent optimization of their spacing to achieve uniform brightness while reducing the total number of devices required.
2Productivity
If the number of light emitting devices is reduced to improve efficiency, then manufacturing costs decrease, but the pitch between devices increases causing brightness variation
Solution Approach 1:
The patent resolves this contradiction by applying local quality through differentiated pitch arrangements. The first light emitting devices use a first pitch optimized for spacing, while the second light emitting devices use a second pitch optimized for brightness uniformity, allowing efficiency improvement without sacrificing uniformity.
Solution Approach 2:
The patent employs asymmetry by using different pitch values for the two types of light emitting devices. The first pitch and second pitch are deliberately made different, creating an asymmetric arrangement that optimizes both efficiency and brightness uniformity simultaneously.
3Ease of manufacture
If light emitting devices are arranged in a regular grid pattern, then manufacturing is simplified, but the number of devices increases and brightness uniformity is compromised
Solution Approach 1:
The patent segments the regular grid pattern into two interleaved sub-grids, one for first light emitting devices and another for second light emitting devices. This segmentation allows each subset to maintain a regular pattern for ease of manufacture while the combined arrangement reduces the total device count and improves uniformity.
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 achieves a significant reduction in the number of light emitting devices, lowering manufacturing costs and maintaining high luminance and uniformity, with a 17% reduction in luminance compared to traditional designs while ensuring consistent brightness across the panel.
Implementation Method 1
when a current is applied to a semiconductor light emitting diode (LED), the semiconductor LED can generate light of various colors by recombination of electrons and holes in a p-n junction between p-type and n-type semiconductors
Data Source
AI summary
There are provided a plane light source and an LCD backlight unit having the same. A plane light source including light emitting device matrixes each having a plurality of light emitting devices arranged in rows and columns on a substrate according to an aspect of the invention includes: a first matrix having a plurality of light emitting devices arranged in rows and columns; and a second matrix having a plurality of light emitting devices arranged in rows and columns, the light emitting devices each located within a rectangle formed by four adjacent light emitting devices included in the first matrix, and forming angles θ satisfying the condition of 45°≦θ≦55° therebetween on the basis of a horizontal direction, wherein among pitches between one light emitting devices included in the light emitting device matrixes and another lighting light emitting device adjacent to the light emitting device, a pitch P1 between the light emitting device and the light emitting device diagonally across from the light emitting device satisfies the condition of 25 mm≦P1≦29 mm, and a pitch P2 between the light emitting device and another light emitting device located in a horizontal direction satisfies the condition of 34 mm≦P2≦38 mm.