LED Backlight Thermal Management via Asymmetric Substrate Segmentation
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Solution Overview
Problem
Conventional liquid crystal display devices with backlight units face heat concentration issues due to uneven arrangement of light emitting diodes, which can lead to increased heat generation and potential thermal management problems.
Innovation Solution
The solution involves arranging light emitting diodes on two adjacent substrates such that their anodes face each other, with the cathodes positioned to avoid direct proximity, thereby reducing heat concentration. This configuration includes specific wiring connections and arrangements to manage heat dissipation effectively across the substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light emitting diodes are arranged at unequal pitches to reduce substrate size, then substrate size is reduced, but heat concentration increases at areas where LEDs are closely packed
Solution Approach 1:
The substrate is divided into first and second substrates with different LED arrangements. The first substrate has LEDs arranged at first pitches with cathodes facing the second substrate, while the second substrate has LEDs arranged at second pitches with anodes facing the first substrate. This segmentation allows each substrate to be optimized independently, reducing overall size while distributing heat generation across separate regions.
Solution Approach 2:
The patent employs asymmetric LED arrangements on the two substrates. The first substrate uses a first pitch configuration while the second substrate uses a second pitch configuration, creating an asymmetric overall pattern. This asymmetry enables compact packaging while ensuring that high-density regions on one substrate do not directly overlap with high-density regions on the other substrate, thereby distributing heat concentration.
2Temperature
If light emitting diodes are arranged evenly at equal intervals, then heat generation is uniform, but substrate size increases compared to unequal pitch arrangements
Solution Approach 1:
The patent transitions from a single-plane even arrangement to a multi-layer asymmetric arrangement. By distributing LEDs across two substrates with different pitch configurations and opposite polarities, the design achieves uniform heat distribution in the vertical dimension while compacting the horizontal footprint. The first substrate's cathode-facing LEDs and second substrate's anode-facing LEDs create complementary heat patterns that balance overall thermal distribution.
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 approach effectively mitigates heat concentration by keeping cathodes, which generate heat, apart from each other, thereby improving thermal management and maintaining the brightness and uniformity of the display while reducing the risk of thermal damage.
Implementation Method 1
a plurality of light emitting diodes each having an anode and a cathode
Implementation Method 2
heat generated from the light emitting diodes
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel, and a backlight unit. The backlight unit includes a plurality of light emitting diodes each having an anode and a cathode, and first adjacently and disposed substrates. The plurality of light emitting diodes are mounted on the first substrate and the second substrate and arranged in a plurality of rows. A first light emitting diode mounted on the first substrate and a second light emitting diode mounted on the second substrate which are adjacent across a boundary between the first substrate and the second substrate are disposed so that respective anodes of the first and second light emitting diodes are opposed to each other and have a pitch equal to or smaller than a pitch of other light emitting diodes mounted on the first and second substrates.