Stereoscopic Reflection Pattern for Backlight Unit Thickness Reduction
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Solution Overview
Problem
The challenge is to reduce the thickness of display devices while maintaining image quality and light efficiency, as existing backlight units face difficulties in minimizing thickness without compromising image quality or light efficiency due to optical gap reduction.
Innovation Solution
A stereoscopic reflection pattern is introduced in the backlight unit, comprising a first reflection pattern with high reflectivity and a second reflection pattern with lower reflectivity, strategically positioned to optimize light reflection and interference, reducing light loss and enhancing luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the backlight unit is reduced to reduce the thickness of the display device, then the thickness of the display device is reduced, but the image quality and light efficiency are lowered due to reduction of the optical gap
Solution Approach 1:
The patent applies local quality by creating a reflection pattern with spatially varying reflectivity - a first region with higher reflectivity and a second region with lower reflectivity. This local differentiation allows the backlight unit to maintain effective optical performance in a reduced thickness configuration, as the high-reflectivity region compensates for the reduced optical gap while the low-reflectivity region prevents optical interference
Solution Approach 2:
The patent transitions from considering only the thickness dimension to incorporating the reflectivity distribution dimension. By varying reflectivity across different regions and wavelengths, the system achieves effective light management in a thinner profile, adding a functional dimension beyond mere geometric thickness
2Length of stationary object
If the thickness of the backlight unit is reduced to reduce the thickness of the display device, then the thickness of the display device is reduced, but the light efficiency is lowered due to reduction of the optical gap
Solution Approach 1:
The reflection pattern with spatially varying reflectivity efficiently directs light toward the display panel in the reduced-thickness configuration. The high-reflectivity first region maximizes light extraction while the low-reflectivity second region optimizes light direction, together maintaining high light efficiency despite the reduced optical gap
Solution Approach 2:
The patent changes the reflectivity parameter across different spatial regions and wavelength ranges. By optimizing the reflectivity values and their spatial distribution, the system achieves efficient light extraction and direction in a thinner backlight unit, converting the reflectivity parameter profile to compensate for reduced thickness
3Use of energy by moving object
If a reflection pattern with high reflectivity is used to improve light efficiency, then light efficiency is improved, but optical interference and image quality deterioration may occur
Solution Approach 1:
The patent resolves this contradiction by applying different reflectivity characteristics to different regions. The first region uses higher reflectivity to maximize light efficiency, while the second region uses lower reflectivity to prevent optical interference. This spatial differentiation allows both high light efficiency and good image quality to coexist
Solution Approach 2:
The reflection pattern is segmented into distinct regions with different reflectivity properties. This segmentation allows the system to optimize for light efficiency in one region while controlling optical interference in another region, resolving the contradiction between these two requirements
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 reduces light loss, prevents image quality deterioration, and improves overall light efficiency by constructively interfering reflected light and directing it to the display panel, ensuring uniform brightness and improved image quality.
Implementation Method 1
a first reflection pattern including a first portion facing the light source and having a first reflectivity with respect to the light having the first wavelength band, and a second portion disposed adjacent to the first portion and having a second reflectivity with respect to the light having the first wavelength band
Implementation Method 2
improves the efficiency of light supplied to the display panel by the backlight unit... constructively interfering reflected light and directing it to the display panel
Data Source
AI summary
A stereoscopic reflection pattern includes a first reflection pattern including a first portion facing the light source and having a first reflectivity with respect to the light having the first wavelength band, and a second portion disposed adjacent to the first portion and having a second reflectivity with respect to the light having the first wavelength band, and the a second reflectivity being lower than the first reflectivity, and a second reflection pattern disposed between the plurality of light sources and the first reflection pattern, at least partially corresponding to the second portion of the first reflection pattern and having a third reflectivity with respect to the light in the first wavelength band which is higher than the second reflectivity.