Oblique Sidewall LED Package for LCD Light Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LCD devices experience hot spots and poor light mixture performance due to light emission blind areas caused by the view angle limitations of linearly arranged LEDs, which restrict light rays from passing through certain regions of the light guide plate, leading to alternate bright and dark areas.
Innovation Solution
An LED package structure with an obliquely disposed first sidewall and a light exiting wall, where the LED chip is placed on a bottom wall, and light rays are reflected by the sidewall and exit through a light exiting aperture, increasing the light mixing distance and eliminating blind areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LED lamps are arranged linearly on a light guide plate, then the light source can be provided, but light emission blind areas exist between adjacent LEDs due to view angle limitations, causing alternate dark and bright regions
Solution Approach 1:
The patent transitions from a conventional planar LED arrangement to a three-dimensional reflective cavity structure. The LED chip is positioned within a frame that includes oblique sidewalls and a light exiting wall, creating a volumetric light mixing chamber. This dimensional change allows light rays to reflect multiple times within the cavity before exiting, eliminating blind areas and achieving uniform illumination without compromising light emission intensity.
2Object-affected harmful factors
If the distance between the light guide plate and LED lamp is increased, then hot spots may be eliminated, but the view angle range of LED lamps becomes even smaller and light ray utilization factor degrades
Solution Approach 1:
The patent introduces a reflective cavity structure as an intermediary between the LED chip and the light guide plate. This cavity with oblique sidewalls and light exiting wall acts as a light redirector and mixer, ensuring that all light rays from the LED are effectively utilized and directed toward the light guide plate. The reflective surfaces prevent light loss while eliminating hot spots through proper light distribution, thus resolving the contradiction between eliminating harmful effects and maintaining energy efficiency.
3Loss of energy
If LED lamps are placed close to the light guide plate, then light ray utilization is improved, but light emission blind areas are created causing poor light mixture performance
Solution Approach 1:
The patent employs a three-dimensional reflective cavity structure that allows light rays to travel and reflect within a volumetric space before exiting. The oblique sidewalls and light exiting wall create multiple reflection paths, ensuring that light rays from the LED chip are thoroughly mixed and distributed uniformly. This dimensional approach enables the LED to be positioned close to the light guide plate for high light ray utilization while simultaneously achieving excellent light mixture performance through the cavity's light redirecting geometry.
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 configuration enhances light mixing and eliminates hot spots by ensuring that light rays are reflected and exit through the designed aperture, improving the uniformity of illumination in LCD devices.
Implementation Method 1
the first sidewall is obliquely disposed in a light exiting direction of the LED chip and is inclined at an angle with respect to the bottom wall, and light rays emitted from the LED chip are reflected by the first sidewall
Data Source
AI summary
An LED package structure is disclosed, which comprises an LED chip and a frame for receiving the LED chip, and the frame comprises a bottom wall, a first sidewall and a light exiting wall. The LED chip is disposed on the bottom wall, the first sidewall is obliquely disposed in a light exiting direction of the LED chip, and light rays emitted from the LED chip are reflected by the first sidewall and then exit from the light exiting wall. An LCD device is further disclosed. According to the LCD device and the LED package structure thereof of the present disclosure, light rays emitted from the LED chip are reflected by the first sidewall and then exit from the light exiting wall. This can increase the light mixing distance for the LED chip and avoid occurrence of light emission blind areas, thus eliminating the hot spot phenomenon.