Backlight Light-Control Member Alternating Shielding for Luminance
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Solution Overview
Problem
Conventional illumination devices for liquid crystal display devices face issues with luminance irregularities due to precise alignment requirements of reflection dots and white reflective films, leading to potential optical function failures and luminance inconsistencies.
Innovation Solution
An illumination device with a light-controlling member featuring a light-transmitting layer, first light-shielding sections on the incoming-light surface, and second light-shielding sections on the outgoing-light surface, arranged in an alternating manner to control light exit and mitigate luminance irregularities without precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If reflection dots or white reflective films are used to control light reflection, then light utilization efficiency is improved, but luminance irregularities occur when alignment is not precise
Solution Approach 1:
The patent changes the geometric parameters of the light-shielding sections (width, spacing, arrangement pattern) to create an alternating pattern that redistributes light reflection paths. This parameter modification allows the system to achieve uniform luminance without requiring precise alignment between the light guide and light-emitting elements, thereby resolving the contradiction between light utilization efficiency and alignment precision requirements
2Illumination intensity
If white reflective films are formed with sparseness corresponding to distance from light-emitting source, then light distribution is optimized, but luminance irregularities occur due to alignment errors
Solution Approach 1:
The patent segments the reflective surface into multiple discrete light-shielding sections arranged in an alternating pattern with light-transmitting regions. This segmentation creates multiple independent light reflection paths that collectively achieve uniform illumination without relying on precise alignment, thereby improving both light distribution uniformity and optical function stability
Solution Approach 2:
The patent employs an asymmetric alternating arrangement of light-shielding and light-transmitting sections, where the pattern intentionally creates different path lengths and reflection angles. This asymmetric design compensates for alignment errors by distributing light more evenly across the output surface, enhancing both illumination uniformity and system reliability
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 effectively suppresses luminance irregularities and improves light utilization efficiency, ensuring consistent display quality and productivity in liquid crystal display devices, even under conditions of thermal expansion or contraction.
Implementation Method 1
a light-transmitting layer 18 that transmits light
Implementation Method 2
a first light-shielding section 19 that is arranged at the light source side of the light-transmitting layer 18, and a second light-shielding section 20 that is arranged at the opposite side to the first light-shielding section 19 side of the light-transmitting layer 18
Data Source
AI summary
A backlight device (illumination device) is provided with LEDs (light sources) and a light-controlling sheet (light-controlling member) that is arranged at the exit side of the outgoing-light path of the LEDs. The light-controlling sheet has a light-transmitting layer that transmits light, first light-shielding sections that are arranged at the LED side of the light-transmitting layer, and a second light-shielding section that is arranged at the opposite side to the first light-shielding section side of the light-transmitting layer. The first light-shielding sections and the second light-shielding section are repeatedly arranged side-by-side in an alternating manner.