LED Assembly Light Guiding Panel Uniform Luminance
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Solution Overview
Problem
Liquid crystal display (LCD) devices face issues with non-uniform luminance due to point light sources from LEDs, leading to hot spots and dark areas, which can cause display quality deterioration and increase costs and power consumption when trying to reduce these issues.
Innovation Solution
A display device with a light emitting diode (LED) assembly that includes a printed circuit board with blue LED chips, a fluorescent lens, and a light guiding panel to emit uniform linear light, reducing the need for additional LEDs and minimizing optical gaps, thus preventing hot spots and dark areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between adjacent LEDs is reduced to improve uniformity, then the number of LEDs increases, causing higher cost and power consumption
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the LEDs and the display panel. This light guide plate redistributes the light from discrete LED sources across a larger area, achieving uniform luminance distribution without requiring reduced LED spacing or increased LED quantity.
Solution Approach 2:
The patent transitions from point-source LED illumination to a distributed light guide system that spreads light across a two-dimensional plane. By using the light guide plate's optical properties (total internal reflection, scattering), the system achieves uniform illumination without increasing the density of light sources in the vertical dimension.
2Use of energy by moving object
If the gap between LED and light guide plate is reduced to improve light utilization, then hot spots and dark portions occur
Solution Approach 1:
The patent optimizes the optical parameters of the light guide plate, including its refractive index, thickness, and surface properties. By carefully selecting these parameters and controlling the gap distance, the system achieves both high light utilization efficiency and uniform luminance distribution, avoiding hot spots and dark portions.
3Area of stationary object
If LED chips are placed closer together to reduce bezel width, then the number of chips increases, leading to higher cost and power consumption
Solution Approach 1:
The light guide plate serves as a mediator that decouples the relationship between LED density and display area. It allows the system to maintain a large display area with fewer LED chips by redistributing light efficiently across the entire panel surface.
Solution Approach 2:
The light guide plate performs multiple functions simultaneously: it acts as a light distributor, a uniformity controller, and a bezel reducer. This multi-functionality enables the system to achieve narrow bezels without proportionally increasing the number of LED chips.
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 uniform linear light with high luminance, reducing power consumption and fabrication costs while maintaining a thin profile and narrow bezel without compromising display quality.
Implementation Method 1
a fluorescent lens over the plurality of LED chips
Implementation Method 2
a light guiding panel between an adjacent two of the plurality of LED chips
Data Source
AI summary
A display device comprises a liquid crystal panel, an optical sheet under the liquid crystal panel, and a light emitting diode (LED) assembly configured to supply a light to the liquid crystal panel through the optical sheet. The LED assembly includes a printed circuit board (PCB), a plurality of LED chips on the PCB and configured to emit a blue colored light, a fluorescent lens over the plurality of LED chips, and a light guiding panel between an adjacent two of the plurality of LED chips.