Backlight Assembly Total Reflection Plate Array Sheet 3D Luminance
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Solution Overview
Problem
Barrier-type 3D image display devices suffer from reduced luminance due to light blocking by the parallax barrier, and 2D/3D switchable devices face challenges in maintaining high luminance in 3D mode, making it difficult to improve luminance efficiency.
Innovation Solution
A backlight assembly comprising a light source part, a total reflection plate, and an array sheet, where the array sheet refracts and transmits light to minimize light blocking, allowing for efficient luminance distribution between 2D and 3D modes by using a combination of edge and direct illumination types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a parallax barrier is used to display 3D images, then 3D image display capability is achieved, but luminance is reduced due to light blocking
Solution Approach 1:
The array sheet is divided into multiple units, each corresponding to a specific light source. Each unit selectively transmits or reflects light based on its position and the light source being activated, enabling 3D image display while improving light utilization efficiency
Solution Approach 2:
The total reflection plate acts as an intermediary between the light source and the array sheet. It redirects light that would otherwise be wasted toward the array sheet, thereby increasing the luminance without requiring additional light sources
2Illumination intensity
If the number of light sources is increased to improve 3D mode luminance, then luminance efficiency may improve, but structural limitations prevent further increases
Solution Approach 1:
The system uses itself to improve luminance by redirecting waste light through the total reflection plate. The light sources serve dual purposes: directly illuminating the display and providing light that is reflected back through the array sheet, eliminating the need for additional light sources
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 enhances luminance efficiency in 3D mode while maintaining comparable luminance to 2D mode, improving display quality by minimizing light blocking and optimizing light usage, thus achieving high luminance in both modes.
Implementation Method 1
The total reflection plate totally internally reflects or transmits the light selectively according to an incident path of the light
Implementation Method 2
each of the units refracts the totally internally reflected light at a contact surface between the incident surface and the total reflection plate to emit the refracted light
Data Source
AI summary
A backlight assembly includes a light source part, a total reflection plate and an array sheet. The light source part generates light. The total reflection plate totally internally reflects or transmits the light selectively according to an incident path of the light. The array sheet disposed on the total reflection plate includes a plurality of units having an incident surface making contact with the total reflection plate and an emitting surface facing the incident surface, refracts the totally internally reflected light at a contact surface between the incident surface and the total reflection plate to emit the refracted light, and emits the transmitted light as a non-refracted light. Accordingly, luminance of the display device is enhanced.