Angled LED Light Source Assembly for LCD Uniform Illumination
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Solution Overview
Problem
Conventional liquid crystal displays face challenges in assembly complexity due to separate light holders for LEDs and require numerous LEDs to achieve uniform illumination, leading to increased costs and complexity.
Innovation Solution
A light source assembly comprising a light guide plate, a printed circuit board with angled light emitting elements, where light from the elements is transmitted obliquely to the light guide plate, enhancing illumination efficiency and reducing the number of LEDs needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate light holder is used to position LEDs, then the LEDs can be properly positioned, but the assembly complexity increases
Solution Approach 1:
The patent merges the light holder function with the printed circuit board by directly mounting LEDs on the PCB. The PCB serves dual purposes: electrical connection and mechanical positioning. This eliminates the separate light holder component and simplifies assembly, while maintaining reliable LED positioning through the PCB's structural support and mounting features.
2Illumination intensity
If LEDs are mounted to illuminate the frame edge, then the desired lighting effect is achieved, but a large number of LEDs is required due to limited emission angles
Solution Approach 1:
The patent introduces a light guide plate as an intermediary between the LEDs and the frame edge. The light guide plate receives light from a reduced number of LEDs and redistributes it across the frame edge area. This mediator component expands the effective illumination coverage of each LED, reducing the total number of LEDs needed while maintaining the desired edge lighting effect.
3Device complexity
If LEDs emit light within certain angles, then the LED structure is simple, but the illumination uniformity across the frame edge is poor
Solution Approach 1:
The light guide plate acts as a mediator that receives angularly-limited LED light and redistributes it uniformly across the frame edge. The plate's optical properties and geometry transform the directional LED output into uniform omnidirectional illumination, maintaining simple LED structures while achieving illumination uniformity.
Solution Approach 2:
The patent changes the optical parameters of the illumination system by using a light guide plate with specific refractive indices, surface textures, or cross-sectional geometries. These parameter changes enable the plate to redirect and diffuse LED light, transforming the angular emission pattern into uniform illumination across the frame edge.
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
Simplifies assembly, reduces the number of LEDs required, and improves the uniformity of light distribution, resulting in enhanced optical effects and cost savings.
Implementation Method 1
Light from the at least two light emitting elements is transmitted to the light guide plate obliquely
Data Source
AI summary
An exemplary light source assembly includes a light guide plate, a printed circuit board facing the light guide plate, and at least two light emitting elements. The at least two light emitting elements are angled on the printed circuit board. Light emitted from the at least two light emitting elements is obliquely transmitted onto the light guide plate.