Backlight Unit Reflectors for Display Thickness and Luminance
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Solution Overview
Problem
Display apparatuses face challenges in reducing thickness and achieving luminance uniformity due to the optical distance and dark areas in the backlight unit (BLU).
Innovation Solution
Incorporating an array of reflectors between light sources in the BLU to reflect light while supporting a diffuser plate or composite sheet, which reduces optical distance and dark areas, thereby enhancing luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the optical distance of the display apparatus is reduced to achieve thinner thickness, then the thickness is reduced, but the luminance uniformity deteriorates due to increased dark areas in the backlight unit
Solution Approach 1:
The reflector is divided into multiple reflection regions (first reflection region, second reflection region, third reflection region) with different reflective properties. Each region segments the light reflection function to address different areas of the backlight unit, allowing optimized light distribution even with reduced optical distance.
Solution Approach 2:
Different regions of the reflector are assigned different local qualities - the first reflection region has high reflectivity for overall light reflection, the second reflection region has directional reflection properties to fill dark areas, and the third reflection region has specific angular reflection characteristics. This local differentiation maintains luminance uniformity despite reduced thickness.
2Illumination intensity
If reflectors are added between light sources to improve luminance uniformity, then luminance uniformity is improved, but the device complexity increases
Solution Approach 1:
The reflector serves multiple functions simultaneously: it reflects light from LEDs, supports the diffuser plate mechanically, and its specific geometric design (frustum of square pyramid) provides both structural support and optical reflection functions. This multi-functionality reduces the need for separate components.
Solution Approach 2:
The reflector and support structure are merged into a single component. The frustum-shaped reflector provides both optical reflection and mechanical support for the diffuser plate, eliminating the need for separate support structures and reducing overall device complexity.
3Ease of manufacture
If the interval between reflectors is increased to reduce device complexity, then manufacturing is simplified, but the effectiveness of reducing dark areas deteriorates
Solution Approach 1:
The reflector design utilizes three-dimensional geometric shapes (frustum of square pyramid) with specific angular relationships. The diagonal arrangement and angled surfaces create light reflection paths in multiple dimensions, effectively filling dark areas even with larger intervals between reflectors.
Solution Approach 2:
The reflectors are arranged asymmetrically with intervals that are greater than the LED intervals, and the reflector shapes themselves are asymmetric (frustum geometry). This asymmetric design optimizes light distribution patterns to effectively cover dark areas while allowing larger spacing between reflectors.
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 reduces the thickness of the display apparatus and improves luminance uniformity by efficiently reflecting light and diffusing it, addressing the limitations of existing BLU designs.
Implementation Method 1
a plurality of refractive covers, and a plurality of reflectors on the substrate disposed between the plurality of LEDs and configured to reflect the light emitted from the plurality of LEDs. Each refractive cover is disposed on a corresponding LED of the plurality of LEDs.
Implementation Method 2
a plurality of reflectors on the substrate disposed between the plurality of LEDs and configured to reflect the light emitted from the plurality of LEDs
Data Source
AI summary
The present disclosure provides display apparatuses including a backlight unit (BLU). In some embodiments, the display apparatus includes a liquid crystal panel, and a BLU configured to provide light to the liquid crystal panel. The BLU includes a substrate, a plurality of light-emitting diodes (LEDs) on the substrate and configured to emit the light, a plurality of refractive covers, and a plurality of reflectors on the substrate disposed between the plurality of LEDs and configured to reflect the light emitted from the plurality of LEDs. Each refractive cover is disposed on a corresponding LED of the plurality of LEDs.