Backlight Assembly High Reflectivity Reflector Sheet
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Solution Overview
Problem
Existing liquid crystal display (LCD) backlight assemblies face challenges in achieving high brightness while minimizing power consumption, as most light emitted by the backlight is filtered out by polarizers, leading to energy loss and increased manufacturing complexity and cost.
Innovation Solution
The proposed backlight assembly incorporates a light guide plate, a light source, and high reflectivity second reflector sheets (>90%) positioned on the bottom and/or light emitting surfaces, along with a flexible circuit board and optical adhesive tapes, to improve light incidence efficiency by reflecting leaked light back into the light guide plate, thereby enhancing brightness and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlight assemblies are used, then manufacturing complexity and cost increase, but brightness and power consumption improvement is limited
Solution Approach 1:
The patent changes the reflectivity parameter of the reflector sheet from conventional values to greater than 90%, specifically using silver reflector sheets with reflectivity of 93-95%. This parameter change significantly improves light utilization efficiency and brightness while simplifying the overall backlight assembly structure, resolving the contradiction between brightness improvement and manufacturing complexity
Solution Approach 2:
The patent extracts and removes the polarizer component from the backlight assembly. By taking out the polarizer that causes light filtering and energy loss, the system achieves higher brightness and lower power consumption without the manufacturing complexity associated with polarizer integration and alignment
2Loss of energy
If conventional reflector sheets are used, then light utilization efficiency is limited, but manufacturing cost and complexity increase
Solution Approach 1:
The patent changes the reflectivity parameter from conventional values to greater than 90% by using silver reflector sheets. This single parameter change improves light utilization efficiency by 7-13% while actually reducing manufacturing cost and complexity, as the silver reflector sheet integrates multiple functions into one component
Solution Approach 2:
The patent merges the reflector function with the circuit board structure by placing the silver reflector sheet on the circuit board. This combination eliminates the need for separate reflector components and simplifies assembly, reducing manufacturing cost while improving light utilization efficiency
3Illumination intensity
If high brightness is achieved through conventional means, then power consumption increases, but structural complexity increases
Solution Approach 1:
The patent converts the harmful light loss that occurs with conventional polarizers into a benefit by removing the polarizer entirely and using high reflectivity surfaces to redirect light that would otherwise be lost. This converts the problem of light filtering into an opportunity for improved light utilization, achieving higher brightness with lower power consumption
Solution Approach 2:
By changing the reflectivity parameter to greater than 90%, the system significantly improves light utilization efficiency, reducing the power needed to achieve the same brightness level. The silver reflector sheet with 93-95% reflectivity enables this parameter change that simultaneously reduces power consumption and simplifies structure
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 improves light utilization efficiency by approximately 7-13%, reduces power consumption, and simplifies the manufacturing process, resulting in a cost-effective and high-yield solution for LCD backlight assemblies.
Implementation Method 1
a reflectivity of the second reflector sheet is greater than 90%
Data Source
AI summary
A backlight assembly and a display device are provided. The backlight assembly includes a light guide plate, a light source, and a first reflector sheet. The light guide plate includes a bottom surface and a light emitting surface opposite to each other, and a light incident surface intersecting the bottom surface and the light emitting surface. The light source is on the light incident surface of the light guide plate. The first reflector sheet is on the bottom surface of the light guide plate and at an end of the light guide plate distal to the light source. The backlight assembly further includes a second reflector sheet proximal to the light source. The second reflector sheet is on the bottom surface and/or the light emitting surface of the light guide plate, and a reflectivity of the second reflector sheet is greater than 90%.