Prism Light Mixing Element for Uniform Backlight
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Solution Overview
Problem
Large-size LED LCD TVs face challenges with brightness and optical uniformity due to the limitations of traditional edge-lit backlight modules, leading to increased manufacturing costs and limitations in achieving a low-weight, thin-profile design.
Innovation Solution
A light mixing element in the shape of a prism with specific inclined surfaces and microstructures, combined with a trapezoidal light guide plate and a backlight module configuration that includes multiple light mixing elements between adjacent light guide plates, enhances light mixing and uniformity, allowing for high brightness and reduced thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If small-size LEDs are arranged in multiple units or light mixing distance is increased to achieve uniform light distribution, then optical uniformity is improved, but manufacturing cost increases and device thickness increases
Solution Approach 1:
A light mixing element is introduced as an intermediary component between the LED light source and the diffusion plate. This element actively mixes the light from multiple LEDs before it reaches the diffusion plate, achieving uniform light distribution without requiring increased light mixing distance or additional LED units, thereby reducing manufacturing cost and device thickness
Solution Approach 2:
The light mixing function is extracted from the diffusion plate and implemented by a dedicated light mixing element. This separation allows the diffusion plate to focus solely on diffusion while the light mixing element handles light redistribution, improving overall system efficiency and reducing the need for increased light mixing distance
2Illumination intensity
If multiple LEDs are arranged to achieve uniform light distribution, then optical uniformity is improved, but manufacturing cost increases
Solution Approach 1:
The light mixing element serves as a cost-effective intermediary that achieves uniform light distribution without requiring multiple LED units. By placing this element between the LED array and diffusion plate, the system achieves optical uniformity using fewer LEDs, thereby reducing manufacturing cost
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 achieves high brightness and optical uniformity in large-size displays while reducing manufacturing costs and enabling a thinner profile, effectively addressing the limitations of traditional edge-lit backlights.
Implementation Method 1
a reflecting inclined surface connected between a first side of the bottom surface and a second side of the light mixing element first light-emitting inclined surface
Implementation Method 2
a light mixing element in a shape of a prism... a light mixing element first light-emitting inclined surface, a light mixing element second light-emitting inclined surface
Data Source
Figure 1a
Figure 1b
Figure 2~3a
AI summary
A light mixing element in a shape of a prism, and a cylinder of the prism of the light mixing element includes a first light-emitting inclined surface (101), a second light-emitting inclined surface (102), a bottom surface (103), an incident surface (104) and a reflecting inclined surface (105); one side of the second light-emitting inclined surface is connected with one side of the first light-emitting inclined surface to form a top angle; the bottom surface is arranged opposite to the top angle; the incident surface is connected between one side of the bottom surface and the other side of the first light-emitting inclined surface; and the reflecting inclined surface is connected between the other side of the bottom surface and the other side of the second light-emitting inclined surface and arranged opposite to the incident surface and the first light-emitting inclined surface.