Planar Backlight Layout for Uniform Edge Luminance
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Solution Overview
Problem
Existing planar lighting devices face issues with non-uniform edge luminance due to variations in distance between light sources, leading to uneven lighting.
Innovation Solution
A planar lighting device with a light regulator that includes reflectors and absorbers disposed along the edges to regulate luminance differences by reflecting or absorbing light, combined with optical sheets to enhance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are arranged on the circuit substrate to provide illumination, then lighting function is achieved, but luminance uniformity at edges deteriorates due to distance variations
Solution Approach 1:
The patent applies local quality by introducing light regulators (reflectors and absorbers) specifically at the edge portions of the circuit substrate where luminance uniformity deteriorates. The reflectors are disposed at edge portions far from light sources to reflect light toward the center, while absorbers are placed at edge portions close to light sources to absorb excessive light. This localized intervention addresses the specific problem of non-uniform edge luminance without affecting the overall lighting function.
Solution Approach 2:
The patent uses light regulators as intermediary elements between the light sources and the display panel. These regulators (reflectors and absorbers) mediate the light distribution by reflecting or absorbing light at strategic positions to compensate for the luminance differences caused by varying distances from light sources, thereby achieving more uniform overall luminance distribution.
2Productivity
If direct-type light emitting diodes are used, then lighting efficiency is improved, but edge luminance non-uniformity worsens
Solution Approach 1:
The patent maintains the high efficiency of direct-type LEDs while addressing their edge luminance non-uniformity problem by applying localized light regulators at edge portions. The reflectors and absorbers are strategically positioned to compensate for the distance-based luminance variations inherent in direct-type LED arrangements, thereby preserving lighting efficiency while improving edge uniformity.
3Illumination intensity
If light regulators are added to improve luminance uniformity, then edge luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent minimizes the increase in device complexity by introducing light regulators only at the edge portions where luminance uniformity is problematic, rather than uniformly across the entire circuit substrate. This localized approach reduces the total number of additional components and simplifies the overall structure while still achieving improved edge luminance uniformity.
Solution Approach 2:
The patent segments the circuit substrate into different regions: light source regions, edge portions far from light sources, and edge portions close to light sources. Different light regulators (reflectors or absorbers) are applied to different segments based on their specific luminance characteristics, allowing for targeted correction with minimal added complexity.
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 improved luminance uniformity across the entire surface by regulating light distribution, ensuring consistent brightness levels.
Implementation Method 1
The light regulator may include one or more reflectors for reflecting light emitted from the light sources to an inside or an upper part of an area defined by the first surface
Implementation Method 2
The light regulator may include one or more absorbers for absorbing light emitted from the light sources
Implementation Method 3
an optical sheet disposed on the light sources
Data Source
AI summary
A display device including a liquid crystal panel, a backlight unit providing light to the liquid crystal panel, and a lower cover, wherein the backlight unit is disposed between the liquid crystal panel and the lower cover, and wherein the backlight unit includes a first circuit substrate and a second circuit substrate on the lower cover, a plurality of light sources disposed on the first circuit substrate and a second circuit substrate, a gap between the first circuit substrate and a second circuit substrate, a reflection layer disposed on the first circuit substrate, a second circuit substrate and the gap, a first adhesive disposed between the first circuit substrate and the reflection layer, and a second adhesive disposed between the second circuit substrate and the reflection layer, wherein the first and second circuit substrates and the reflection layer are partially connected through the first and second adhesive.