Backlight Unit Air Space Reduces Light Source Interference
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Solution Overview
Problem
Conventional liquid crystal display (LCD) backlight units face issues with non-uniform luminance and interference between light sources, leading to reduced image quality and contrast ratio.
Innovation Solution
A backlight unit design incorporating a light emitting diode (LED) array with a resin layer and reflection layer, along with a diffusion plate and light shielding parts, to provide uniform luminance and reduce interference, while allowing for independent control of light intensity in different regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple light sources are disposed close to each other on the backlight unit, then the light distribution can cover the entire display area, but interference between light sources occurs and luminance uniformity deteriorates
Solution Approach 1:
The backlight unit is divided into multiple independently controllable light source groups or regions. Each group can be controlled separately to compensate for interference effects and maintain overall luminance uniformity across the display area.
Solution Approach 2:
Different regions of the backlight unit are assigned different luminance characteristics. By adjusting the intensity of individual light sources or regions locally, the overall luminance uniformity is improved while accounting for interference patterns between adjacent light sources.
2Device complexity
If light sources are disposed at the edge of the display panel, then the structure is compact, but the luminance in non-reach areas is insufficient
Solution Approach 1:
Light guides are used to redirect light from edge-mounted sources into the display panel thickness dimension, allowing light to reach areas that would otherwise be in shadow zones, thereby improving luminance uniformity without increasing structural complexity.
3Productivity
If light sources are disposed directly on the back surface, then light can be provided directly to the display panel, but hot spots and luminance non-uniformity occur
Solution Approach 1:
A light guide plate or diffusion layer is introduced as an intermediary between the light sources and the display panel. This intermediary distributes the light more evenly across the panel surface, eliminating hot spots while maintaining the direct backlighting configuration.
4Illumination intensity
If light intensity is increased to improve image quality, then brightness is enhanced, but interference between light sources becomes more pronounced
Solution Approach 1:
The intensity of individual light sources is dynamically adjusted based on their position and interference patterns. By varying the intensity of each light source independently, overall brightness is maintained while interference effects are minimized through adaptive control.
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 luminance, improved image quality, and increased color contrast ratio by reducing hot spots and ensuring consistent light distribution across the display panel.
Implementation Method 1
A backlight unit design incorporating a light emitting diode (LED) array
Implementation Method 2
a light emitting unit such as an LED
Implementation Method 3
incorporating a light emitting diode (LED) array with a resin layer and reflection layer, along with a diffusion plate
Implementation Method 4
diffusion plate and light shielding parts, to provide uniform luminance
Implementation Method 5
resin layer and reflection layer
Data Source
Figure 1~5
Figure 6~9(c)
Figure 10~13
AI summary
A backlight unit and a display device including the backlight unit are discussed. According to an embodiment, a light generating device comprising a first layer,light source devices disposed on the first layer and configured to emit light,a reflection layer disposed on the first layer and configured to reflect the light emitted from the light source devices,a second layer covering the light source devices and the reflection layer,a diffusion layer disposed on the second layer and configured to diffuse the light emitted from the light source devices; and an auxiliary layer having light shielding members placed between the second layer and the diffusion layer, the auxiliary layer being separated from the second layer so as to create an air space between a surface of the second layer and surfaces of the light shielding members, the air space extending along the light source devices.