Backlight Unit Single Substrate Slimming
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Solution Overview
Problem
Conventional backlight units require two substrates, increasing thickness and complexity of wiring, which affects reliability and bezel size, and can lead to increased thickness and decreased reliability.
Innovation Solution
A backlight unit design featuring a single substrate with first and second light sources arranged alternately, connected by distinct wiring portions and connectors, allowing for a slim structure and preventing miss-assembling during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two substrates are used in conventional backlight units, then light sources can be arranged to generate white light, but the thickness of the backlight unit increases
Solution Approach 1:
The patent merges two separate substrates into a single substrate, integrating the arrangement of red, green, and blue light sources on one substrate to generate white light. This eliminates the need for a second substrate, thereby reducing the overall thickness of the backlight unit while maintaining the capability to produce white light through light mixing.
Solution Approach 2:
The patent transitions from a multi-layer substrate structure (two substrates stacked) to a single-plane substrate structure. By arranging light sources in specific patterns on a single substrate plane, the design achieves white light generation without increasing thickness in the vertical dimension, effectively solving the contradiction between illumination capability and thickness.
2Illumination intensity
If two substrates are used in conventional backlight units, then light sources can be arranged to generate white light, but the wiring configuration becomes complex
Solution Approach 1:
By combining the functions of two substrates into one, the patent reduces the number of wiring connections required. Instead of wiring two separate substrates independently, the single substrate design allows for integrated wiring that connects all light sources (red, green, blue) to a single power supply, significantly simplifying the wiring configuration.
Solution Approach 2:
The single substrate serves multiple functions simultaneously: it supports all three types of light sources (red, green, blue LEDs), provides a common wiring infrastructure for all light sources, and enables white light generation through spatial arrangement. This multi-functionality reduces overall system complexity compared to using two specialized substrates.
3Illumination intensity
If two substrates are used in conventional backlight units, then light sources can be arranged to generate white light, but the reliability of the backlight unit decreases
Solution Approach 1:
The patent improves reliability by reducing the number of substrates from two to one. Fewer substrates mean fewer potential failure points, fewer connection interfaces, and reduced complexity in the overall structure. This simplification directly enhances the reliability of the backlight unit while maintaining white light generation capability.
4Length of stationary object
If the thickness of substrates is decreased in conventional backlight units, then the overall thickness is reduced, but the wiring becomes complex
Solution Approach 1:
The patent resolves this contradiction by using a single substrate design that allows for optimized wiring layouts. With only one substrate, the wiring can be configured more efficiently without the constraints of connecting multiple thin substrates, enabling reduced substrate thickness without sacrificing wiring simplicity.
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 design achieves a slim substrate width, simplifies wiring, and enhances reliability by using a single substrate with alternating light sources and distinct connectors, preventing assembly errors.
Implementation Method 1
a red LED, a green LED and a blue LED
Implementation Method 2
The first lights and the second lights are mixed to form white lights
Data Source
AI summary
A backlight unit includes a substrate, a plurality of first light sources, a plurality of second light sources, a first wiring portion, a second wiring portion, a first connector and a second connector. The first light sources are disposed on the substrate. The second light sources are disposed on the substrate in a single line. The first wiring portion extends along a length direction on a first peripheral area of the substrate and is connected to the first light sources. The second wiring portion extends along the length direction on a second peripheral area of the substrate and is connected to the second light sources. The first connector is disposed on a first end portion of the substrate and is electrically connected to the first wiring portion. The second connector is disposed on a second end portion of the substrate and is electrically connected to the second wiring portion.