Backlight Unit Beam Splitter Array for Thin Display
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Solution Overview
Problem
Conventional backlight units for display devices are limited by their thickness, which restricts the miniaturization of display devices and affects the efficiency of light distribution to the display module.
Innovation Solution
A backlight unit design incorporating a light source with coherent properties, a beam splitter array with transflective plates, and a light conversion structure that includes a light guide plate and optical film, which directs light efficiently to the display module, reducing thickness while maintaining light distribution efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional backlight unit structure is used, then light distribution function is maintained, but the thickness of the display device increases
Solution Approach 1:
The beam splitter array divides the light path into multiple segments using multiple transflective plates, each handling a portion of the light distribution function. This segmentation allows the system to maintain comprehensive light coverage while reducing the overall thickness compared to a single thick optical component
Solution Approach 2:
The transflective plates are tilted at approximately 45 degrees relative to the light propagation direction, introducing a angular dimension to the light path. This dimensional change allows light to be redirected efficiently through a compact thickness, solving the contradiction between thin profile and light distribution effectiveness
2Length of moving object
If the thickness of backlight unit is reduced, then compact design is achieved, but light distribution uniformity deteriorates
Solution Approach 1:
Each transflective plate in the beam splitter array is positioned and tilted at specific angles to optimize local light distribution in its designated region. This local optimization across multiple plates ensures uniform overall light distribution while maintaining a thin profile
Solution Approach 2:
The transmittance and reflectance parameters of the transflective plates are carefully controlled, with plates farther from the light source having higher reflectance to compensate for reduced light intensity. This parameter adjustment ensures uniform light distribution across the display module despite the compact thickness
3Reliability
If multiple transflective plates are used in beam splitter array, then light distribution efficiency is improved, but device complexity increases
Solution Approach 1:
Multiple transflective plates are merged into a single beam splitter array structure that functions as an integrated light distribution system. This merging approach maintains high light distribution efficiency while reducing the number of separate components and assembly steps compared to using individual optical elements
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 proposed solution enables a thinner display device with uniform light distribution, allowing for more compact designs and improved display performance, such as hologram image display, by effectively guiding light from the light source to the display module.
Implementation Method 1
a beam splitter array including a plurality of transflective plates which transmit or reflect the light provided from the light source
Implementation Method 2
the prism bar may have a refractive index that is substantially the same as that of the light guide plate
Implementation Method 3
a light conversion structure which is provided below the display module, receives the light reflected by the plurality of transflective plates and guides the received light in a direction toward the display module
Implementation Method 4
the prism bar may have a refractive index that is substantially the same as that of the light guide plate
Implementation Method 5
the optical film may include a plurality of diffraction patterns
Data Source
AI summary
A display device includes a display module and a backlight unit which provides a light having a coherent property to the display module. The backlight unit includes a light source which generates the light having the coherent property, a beam splitter array including a plurality of transflective plates which transmit or reflect the light provided from the light source, and a light conversion structure which is provided below the display module, receives the light reflected by the transflective plates and guides the received light in a direction toward the display module.