Backlight Reflector Pattern Asymmetry for Luminance Uniformity
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Solution Overview
Problem
Conventional backlight devices for liquid crystal display devices exhibit periodic luminance unevenness due to the periodic arrangement of light-transmissive printed films, which affects the uniformity of light output.
Innovation Solution
The lighting device incorporates a reflector with unit light source regions arranged in a matrix, featuring a light reflecting pattern and a light transmitting pattern with different distributions in adjacent regions, preventing continuous periodicity and thus minimizing visual recognition of luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-transmissive printed film is formed on a light transmissive plate with periodic area ratio changes, then luminance control is improved, but periodic luminance unevenness occurs
Solution Approach 1:
The light transmissive plate is divided into multiple regions with different light-transmissive printed films, each having different area ratios. This segmentation allows different portions of the plate to have different luminance characteristics, enabling overall luminance uniformity while avoiding continuous periodicity that causes visible unevenness.
Solution Approach 2:
Different regions of the light transmissive plate are assigned different area ratios of light-transmissive printed films based on local luminance requirements. Regions with higher initial luminance receive films with lower area ratios and vice versa, creating local quality variations that achieve global uniformity.
2Illumination intensity
If the area ratio of light-transmissive printed film is periodically changed, then luminance distribution is controlled, but visual recognition of periodic luminance unevenness occurs
Solution Approach 1:
The arrangement of light-transmissive printed films intentionally avoids continuous periodicity by using different area ratios in different regions. This asymmetric distribution prevents the formation of regular patterns that are easily visually recognized, thereby reducing the harmful effect of perceived luminance unevenness.
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 effectively suppresses periodic luminance unevenness, achieving luminance uniformity of 85% or more by controlling the distribution of exit light, enhancing display quality.
Implementation Method 1
a light reflecting pattern disposed in the unit light source regions and reflecting light
Implementation Method 2
a light transmitting pattern disposed in the unit light source regions and transmissive to light
Data Source
AI summary
A lighting device includes light sources arranged in a row direction and a column direction, and a reflector through which at least a part of light rays emitted by the light source. The reflector includes unit light source regions disposed at an interval from the light sources, a light reflecting pattern disposed in the unit light source regions and reflecting light, and a light transmitting pattern disposed in the unit light source regions and transmissive to the part of the light rays. The unit light source regions are disposed such that the unit light source regions adjacent to each other with respect to at least one of the row direction and the column direction have different distributions of at least one of the light reflecting pattern and the light transmitting pattern.